1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* 27 * LDoms virtual disk client (vdc) device driver 28 * 29 * This driver runs on a guest logical domain and communicates with the virtual 30 * disk server (vds) driver running on the service domain which is exporting 31 * virtualized "disks" to the guest logical domain. 32 * 33 * The driver can be divided into four sections: 34 * 35 * 1) generic device driver housekeeping 36 * _init, _fini, attach, detach, ops structures, etc. 37 * 38 * 2) communication channel setup 39 * Setup the communications link over the LDC channel that vdc uses to 40 * talk to the vDisk server. Initialise the descriptor ring which 41 * allows the LDC clients to transfer data via memory mappings. 42 * 43 * 3) Support exported to upper layers (filesystems, etc) 44 * The upper layers call into vdc via strategy(9E) and DKIO(7I) 45 * ioctl calls. vdc will copy the data to be written to the descriptor 46 * ring or maps the buffer to store the data read by the vDisk 47 * server into the descriptor ring. It then sends a message to the 48 * vDisk server requesting it to complete the operation. 49 * 50 * 4) Handling responses from vDisk server. 51 * The vDisk server will ACK some or all of the messages vdc sends to it 52 * (this is configured during the handshake). Upon receipt of an ACK 53 * vdc will check the descriptor ring and signal to the upper layer 54 * code waiting on the IO. 55 */ 56 57 #include <sys/atomic.h> 58 #include <sys/conf.h> 59 #include <sys/disp.h> 60 #include <sys/ddi.h> 61 #include <sys/dkio.h> 62 #include <sys/efi_partition.h> 63 #include <sys/fcntl.h> 64 #include <sys/file.h> 65 #include <sys/kstat.h> 66 #include <sys/mach_descrip.h> 67 #include <sys/modctl.h> 68 #include <sys/mdeg.h> 69 #include <sys/note.h> 70 #include <sys/open.h> 71 #include <sys/random.h> 72 #include <sys/sdt.h> 73 #include <sys/stat.h> 74 #include <sys/sunddi.h> 75 #include <sys/types.h> 76 #include <sys/promif.h> 77 #include <sys/var.h> 78 #include <sys/vtoc.h> 79 #include <sys/archsystm.h> 80 #include <sys/sysmacros.h> 81 82 #include <sys/cdio.h> 83 #include <sys/dktp/fdisk.h> 84 #include <sys/dktp/dadkio.h> 85 #include <sys/fs/dv_node.h> 86 #include <sys/mhd.h> 87 #include <sys/scsi/generic/sense.h> 88 #include <sys/scsi/impl/uscsi.h> 89 #include <sys/scsi/impl/services.h> 90 #include <sys/scsi/targets/sddef.h> 91 92 #include <sys/ldoms.h> 93 #include <sys/ldc.h> 94 #include <sys/vio_common.h> 95 #include <sys/vio_mailbox.h> 96 #include <sys/vio_util.h> 97 #include <sys/vdsk_common.h> 98 #include <sys/vdsk_mailbox.h> 99 #include <sys/vdc.h> 100 101 #define VD_OLDVTOC_LIMIT 0x7fffffff 102 103 /* 104 * function prototypes 105 */ 106 107 /* standard driver functions */ 108 static int vdc_open(dev_t *dev, int flag, int otyp, cred_t *cred); 109 static int vdc_close(dev_t dev, int flag, int otyp, cred_t *cred); 110 static int vdc_strategy(struct buf *buf); 111 static int vdc_print(dev_t dev, char *str); 112 static int vdc_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk); 113 static int vdc_read(dev_t dev, struct uio *uio, cred_t *cred); 114 static int vdc_write(dev_t dev, struct uio *uio, cred_t *cred); 115 static int vdc_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, 116 cred_t *credp, int *rvalp); 117 static int vdc_aread(dev_t dev, struct aio_req *aio, cred_t *cred); 118 static int vdc_awrite(dev_t dev, struct aio_req *aio, cred_t *cred); 119 120 static int vdc_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, 121 void *arg, void **resultp); 122 static int vdc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd); 123 static int vdc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd); 124 static int vdc_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, 125 int mod_flags, char *name, caddr_t valuep, int *lengthp); 126 127 /* setup */ 128 static void vdc_min(struct buf *bufp); 129 static int vdc_send(vdc_t *vdc, caddr_t pkt, size_t *msglen); 130 static int vdc_do_ldc_init(vdc_t *vdc, vdc_server_t *srvr); 131 static int vdc_start_ldc_connection(vdc_t *vdc); 132 static int vdc_create_device_nodes(vdc_t *vdc); 133 static int vdc_create_device_nodes_efi(vdc_t *vdc); 134 static int vdc_create_device_nodes_vtoc(vdc_t *vdc); 135 static void vdc_create_io_kstats(vdc_t *vdc); 136 static void vdc_create_err_kstats(vdc_t *vdc); 137 static void vdc_set_err_kstats(vdc_t *vdc); 138 static int vdc_get_md_node(dev_info_t *dip, md_t **mdpp, 139 mde_cookie_t *vd_nodep); 140 static int vdc_init_ports(vdc_t *vdc, md_t *mdp, mde_cookie_t vd_nodep); 141 static void vdc_fini_ports(vdc_t *vdc); 142 static void vdc_switch_server(vdc_t *vdcp); 143 static int vdc_do_ldc_up(vdc_t *vdc); 144 static void vdc_terminate_ldc(vdc_t *vdc, vdc_server_t *srvr); 145 static int vdc_init_descriptor_ring(vdc_t *vdc); 146 static void vdc_destroy_descriptor_ring(vdc_t *vdc); 147 static int vdc_setup_devid(vdc_t *vdc); 148 static void vdc_store_label_efi(vdc_t *, efi_gpt_t *, efi_gpe_t *); 149 static void vdc_store_label_vtoc(vdc_t *, struct dk_geom *, 150 struct extvtoc *); 151 static void vdc_store_label_unk(vdc_t *vdc); 152 static boolean_t vdc_is_opened(vdc_t *vdc); 153 static void vdc_update_size(vdc_t *vdc, size_t, size_t, size_t); 154 static int vdc_update_vio_bsize(vdc_t *vdc, uint32_t); 155 156 /* handshake with vds */ 157 static int vdc_init_ver_negotiation(vdc_t *vdc, vio_ver_t ver); 158 static int vdc_ver_negotiation(vdc_t *vdcp); 159 static int vdc_init_attr_negotiation(vdc_t *vdc); 160 static int vdc_attr_negotiation(vdc_t *vdcp); 161 static int vdc_init_dring_negotiate(vdc_t *vdc); 162 static int vdc_dring_negotiation(vdc_t *vdcp); 163 static int vdc_send_rdx(vdc_t *vdcp); 164 static int vdc_rdx_exchange(vdc_t *vdcp); 165 static boolean_t vdc_is_supported_version(vio_ver_msg_t *ver_msg); 166 167 /* processing incoming messages from vDisk server */ 168 static void vdc_process_msg_thread(vdc_t *vdc); 169 static int vdc_recv(vdc_t *vdc, vio_msg_t *msgp, size_t *nbytesp); 170 171 static uint_t vdc_handle_cb(uint64_t event, caddr_t arg); 172 static int vdc_process_data_msg(vdc_t *vdc, vio_msg_t *msg); 173 static int vdc_handle_ver_msg(vdc_t *vdc, vio_ver_msg_t *ver_msg); 174 static int vdc_handle_attr_msg(vdc_t *vdc, vd_attr_msg_t *attr_msg); 175 static int vdc_handle_dring_reg_msg(vdc_t *vdc, vio_dring_reg_msg_t *msg); 176 static int vdc_send_request(vdc_t *vdcp, int operation, 177 caddr_t addr, size_t nbytes, int slice, diskaddr_t offset, 178 buf_t *bufp, vio_desc_direction_t dir, int flags); 179 static int vdc_map_to_shared_dring(vdc_t *vdcp, int idx); 180 static int vdc_populate_descriptor(vdc_t *vdcp, int operation, 181 caddr_t addr, size_t nbytes, int slice, diskaddr_t offset, 182 buf_t *bufp, vio_desc_direction_t dir, int flags); 183 static int vdc_do_sync_op(vdc_t *vdcp, int operation, caddr_t addr, 184 size_t nbytes, int slice, diskaddr_t offset, 185 vio_desc_direction_t dir, boolean_t); 186 static int vdc_do_op(vdc_t *vdc, int op, caddr_t addr, size_t nbytes, 187 int slice, diskaddr_t offset, struct buf *bufp, 188 vio_desc_direction_t dir, int flags); 189 190 static int vdc_wait_for_response(vdc_t *vdcp, vio_msg_t *msgp); 191 static int vdc_drain_response(vdc_t *vdcp, struct buf *buf); 192 static int vdc_depopulate_descriptor(vdc_t *vdc, uint_t idx); 193 static int vdc_populate_mem_hdl(vdc_t *vdcp, vdc_local_desc_t *ldep); 194 static int vdc_verify_seq_num(vdc_t *vdc, vio_dring_msg_t *dring_msg); 195 196 /* dkio */ 197 static int vd_process_ioctl(dev_t dev, int cmd, caddr_t arg, int mode, 198 int *rvalp); 199 static int vd_process_efi_ioctl(void *vdisk, int cmd, uintptr_t arg); 200 static void vdc_create_fake_geometry(vdc_t *vdc); 201 static int vdc_validate_geometry(vdc_t *vdc); 202 static void vdc_validate(vdc_t *vdc); 203 static void vdc_validate_task(void *arg); 204 static int vdc_null_copy_func(vdc_t *vdc, void *from, void *to, 205 int mode, int dir); 206 static int vdc_get_wce_convert(vdc_t *vdc, void *from, void *to, 207 int mode, int dir); 208 static int vdc_set_wce_convert(vdc_t *vdc, void *from, void *to, 209 int mode, int dir); 210 static int vdc_get_vtoc_convert(vdc_t *vdc, void *from, void *to, 211 int mode, int dir); 212 static int vdc_set_vtoc_convert(vdc_t *vdc, void *from, void *to, 213 int mode, int dir); 214 static int vdc_get_extvtoc_convert(vdc_t *vdc, void *from, void *to, 215 int mode, int dir); 216 static int vdc_set_extvtoc_convert(vdc_t *vdc, void *from, void *to, 217 int mode, int dir); 218 static int vdc_get_geom_convert(vdc_t *vdc, void *from, void *to, 219 int mode, int dir); 220 static int vdc_set_geom_convert(vdc_t *vdc, void *from, void *to, 221 int mode, int dir); 222 static int vdc_get_efi_convert(vdc_t *vdc, void *from, void *to, 223 int mode, int dir); 224 static int vdc_set_efi_convert(vdc_t *vdc, void *from, void *to, 225 int mode, int dir); 226 227 static void vdc_ownership_update(vdc_t *vdc, int ownership_flags); 228 static int vdc_access_set(vdc_t *vdc, uint64_t flags); 229 static vdc_io_t *vdc_eio_queue(vdc_t *vdc, int index); 230 static void vdc_eio_unqueue(vdc_t *vdc, clock_t deadline, 231 boolean_t complete_io); 232 static int vdc_eio_check(vdc_t *vdc, int flags); 233 static void vdc_eio_thread(void *arg); 234 235 /* 236 * Module variables 237 */ 238 239 /* 240 * Number of handshake retries with the current server before switching to 241 * a different server. These retries are done so that we stick with the same 242 * server if vdc receives a LDC reset event during the initiation of the 243 * handshake. This can happen if vdc reset the LDC channel and then immediately 244 * retry a connexion before it has received the LDC reset event. 245 * 246 * If there is only one server then we "switch" to the same server. We also 247 * switch if the handshake has reached the attribute negotiate step whatever 248 * the number of handshake retries might be. 249 */ 250 static uint_t vdc_hshake_retries = VDC_HSHAKE_RETRIES; 251 252 /* 253 * If the handshake done during the attach fails then the two following 254 * variables will also be used to control the number of retries for the 255 * next handshakes. In that case, when a handshake is done after the 256 * attach (i.e. the vdc lifecycle is VDC_ONLINE_PENDING) then the handshake 257 * will be retried until we have done an attribution negotiation with each 258 * server, with a specified minimum total number of negotations (the value 259 * of the vdc_hattr_min_initial or vdc_hattr_min variable). 260 * 261 * This prevents new I/Os on a newly used vdisk to block forever if the 262 * attribute negotiations can not be done, and to limit the amount of time 263 * before I/Os will fail. Basically, attribute negotiations will fail when 264 * the service is up but the backend does not exist. In that case, vds will 265 * typically retry to access the backend during 50 seconds. So I/Os will fail 266 * after the following amount of time: 267 * 268 * 50 seconds x max(number of servers, vdc->hattr_min) 269 * 270 * After that the handshake done during the attach has failed then the next 271 * handshake will use vdc_attr_min_initial. This handshake will correspond to 272 * the very first I/O to the device. If this handshake also fails then 273 * vdc_hattr_min will be used for subsequent handshakes. We typically allow 274 * more retries for the first handshake (VDC_HATTR_MIN_INITIAL = 3) to give more 275 * time for the backend to become available (50s x VDC_HATTR_MIN_INITIAL = 150s) 276 * in case this is a critical vdisk (e.g. vdisk access during boot). Then we use 277 * a smaller value (VDC_HATTR_MIN = 1) to avoid waiting too long for each I/O. 278 */ 279 static uint_t vdc_hattr_min_initial = VDC_HATTR_MIN_INITIAL; 280 static uint_t vdc_hattr_min = VDC_HATTR_MIN; 281 282 /* 283 * Tunable variables to control how long vdc waits before timing out on 284 * various operations 285 */ 286 static int vdc_timeout = 0; /* units: seconds */ 287 static int vdc_ldcup_timeout = 1; /* units: seconds */ 288 289 static uint64_t vdc_hz_min_ldc_delay; 290 static uint64_t vdc_min_timeout_ldc = 1 * MILLISEC; 291 static uint64_t vdc_hz_max_ldc_delay; 292 static uint64_t vdc_max_timeout_ldc = 100 * MILLISEC; 293 294 static uint64_t vdc_ldc_read_init_delay = 1 * MILLISEC; 295 static uint64_t vdc_ldc_read_max_delay = 100 * MILLISEC; 296 297 /* values for dumping - need to run in a tighter loop */ 298 static uint64_t vdc_usec_timeout_dump = 100 * MILLISEC; /* 0.1s units: ns */ 299 static int vdc_dump_retries = 100; 300 301 static uint16_t vdc_scsi_timeout = 60; /* 60s units: seconds */ 302 303 static uint64_t vdc_ownership_delay = 6 * MICROSEC; /* 6s units: usec */ 304 305 /* Count of the number of vdc instances attached */ 306 static volatile uint32_t vdc_instance_count = 0; 307 308 /* Tunable to log all SCSI errors */ 309 static boolean_t vdc_scsi_log_error = B_FALSE; 310 311 /* Soft state pointer */ 312 static void *vdc_state; 313 314 /* 315 * Controlling the verbosity of the error/debug messages 316 * 317 * vdc_msglevel - controls level of messages 318 * vdc_matchinst - 64-bit variable where each bit corresponds 319 * to the vdc instance the vdc_msglevel applies. 320 */ 321 int vdc_msglevel = 0x0; 322 uint64_t vdc_matchinst = 0ull; 323 324 /* 325 * Supported vDisk protocol version pairs. 326 * 327 * The first array entry is the latest and preferred version. 328 */ 329 static const vio_ver_t vdc_version[] = {{1, 1}}; 330 331 static struct cb_ops vdc_cb_ops = { 332 vdc_open, /* cb_open */ 333 vdc_close, /* cb_close */ 334 vdc_strategy, /* cb_strategy */ 335 vdc_print, /* cb_print */ 336 vdc_dump, /* cb_dump */ 337 vdc_read, /* cb_read */ 338 vdc_write, /* cb_write */ 339 vdc_ioctl, /* cb_ioctl */ 340 nodev, /* cb_devmap */ 341 nodev, /* cb_mmap */ 342 nodev, /* cb_segmap */ 343 nochpoll, /* cb_chpoll */ 344 vdc_prop_op, /* cb_prop_op */ 345 NULL, /* cb_str */ 346 D_MP | D_64BIT, /* cb_flag */ 347 CB_REV, /* cb_rev */ 348 vdc_aread, /* cb_aread */ 349 vdc_awrite /* cb_awrite */ 350 }; 351 352 static struct dev_ops vdc_ops = { 353 DEVO_REV, /* devo_rev */ 354 0, /* devo_refcnt */ 355 vdc_getinfo, /* devo_getinfo */ 356 nulldev, /* devo_identify */ 357 nulldev, /* devo_probe */ 358 vdc_attach, /* devo_attach */ 359 vdc_detach, /* devo_detach */ 360 nodev, /* devo_reset */ 361 &vdc_cb_ops, /* devo_cb_ops */ 362 NULL, /* devo_bus_ops */ 363 nulldev, /* devo_power */ 364 ddi_quiesce_not_needed, /* devo_quiesce */ 365 }; 366 367 static struct modldrv modldrv = { 368 &mod_driverops, 369 "virtual disk client", 370 &vdc_ops, 371 }; 372 373 static struct modlinkage modlinkage = { 374 MODREV_1, 375 &modldrv, 376 NULL 377 }; 378 379 /* -------------------------------------------------------------------------- */ 380 381 /* 382 * Device Driver housekeeping and setup 383 */ 384 385 int 386 _init(void) 387 { 388 int status; 389 390 if ((status = ddi_soft_state_init(&vdc_state, sizeof (vdc_t), 1)) != 0) 391 return (status); 392 if ((status = mod_install(&modlinkage)) != 0) 393 ddi_soft_state_fini(&vdc_state); 394 return (status); 395 } 396 397 int 398 _info(struct modinfo *modinfop) 399 { 400 return (mod_info(&modlinkage, modinfop)); 401 } 402 403 int 404 _fini(void) 405 { 406 int status; 407 408 if ((status = mod_remove(&modlinkage)) != 0) 409 return (status); 410 ddi_soft_state_fini(&vdc_state); 411 return (0); 412 } 413 414 static int 415 vdc_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp) 416 { 417 _NOTE(ARGUNUSED(dip)) 418 419 int instance = VDCUNIT((dev_t)arg); 420 vdc_t *vdc = NULL; 421 422 switch (cmd) { 423 case DDI_INFO_DEVT2DEVINFO: 424 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 425 *resultp = NULL; 426 return (DDI_FAILURE); 427 } 428 *resultp = vdc->dip; 429 return (DDI_SUCCESS); 430 case DDI_INFO_DEVT2INSTANCE: 431 *resultp = (void *)(uintptr_t)instance; 432 return (DDI_SUCCESS); 433 default: 434 *resultp = NULL; 435 return (DDI_FAILURE); 436 } 437 } 438 439 static int 440 vdc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 441 { 442 kt_did_t eio_tid, ownership_tid; 443 int instance; 444 int rv; 445 vdc_server_t *srvr; 446 vdc_t *vdc = NULL; 447 448 switch (cmd) { 449 case DDI_DETACH: 450 /* the real work happens below */ 451 break; 452 case DDI_SUSPEND: 453 /* nothing to do for this non-device */ 454 return (DDI_SUCCESS); 455 default: 456 return (DDI_FAILURE); 457 } 458 459 ASSERT(cmd == DDI_DETACH); 460 instance = ddi_get_instance(dip); 461 DMSGX(1, "[%d] Entered\n", instance); 462 463 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 464 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 465 return (DDI_FAILURE); 466 } 467 468 if (vdc_is_opened(vdc)) { 469 DMSG(vdc, 0, "[%d] Cannot detach: device is open", instance); 470 return (DDI_FAILURE); 471 } 472 473 if (vdc->dkio_flush_pending) { 474 DMSG(vdc, 0, 475 "[%d] Cannot detach: %d outstanding DKIO flushes\n", 476 instance, vdc->dkio_flush_pending); 477 return (DDI_FAILURE); 478 } 479 480 if (vdc->validate_pending) { 481 DMSG(vdc, 0, 482 "[%d] Cannot detach: %d outstanding validate request\n", 483 instance, vdc->validate_pending); 484 return (DDI_FAILURE); 485 } 486 487 DMSG(vdc, 0, "[%d] proceeding...\n", instance); 488 489 /* If we took ownership, release ownership */ 490 mutex_enter(&vdc->ownership_lock); 491 if (vdc->ownership & VDC_OWNERSHIP_GRANTED) { 492 rv = vdc_access_set(vdc, VD_ACCESS_SET_CLEAR); 493 if (rv == 0) { 494 vdc_ownership_update(vdc, VDC_OWNERSHIP_NONE); 495 } 496 } 497 mutex_exit(&vdc->ownership_lock); 498 499 /* mark instance as detaching */ 500 mutex_enter(&vdc->lock); 501 vdc->lifecycle = VDC_LC_DETACHING; 502 mutex_exit(&vdc->lock); 503 504 /* 505 * Try and disable callbacks to prevent another handshake. We have to 506 * disable callbacks for all servers. 507 */ 508 for (srvr = vdc->server_list; srvr != NULL; srvr = srvr->next) { 509 rv = ldc_set_cb_mode(srvr->ldc_handle, LDC_CB_DISABLE); 510 DMSG(vdc, 0, "callback disabled (ldc=%lu, rv=%d)\n", 511 srvr->ldc_id, rv); 512 } 513 514 if (vdc->initialized & VDC_THREAD) { 515 mutex_enter(&vdc->read_lock); 516 if ((vdc->read_state == VDC_READ_WAITING) || 517 (vdc->read_state == VDC_READ_RESET)) { 518 vdc->read_state = VDC_READ_RESET; 519 cv_signal(&vdc->read_cv); 520 } 521 522 mutex_exit(&vdc->read_lock); 523 524 /* wake up any thread waiting for connection to come online */ 525 mutex_enter(&vdc->lock); 526 if (vdc->state == VDC_STATE_INIT_WAITING) { 527 DMSG(vdc, 0, 528 "[%d] write reset - move to resetting state...\n", 529 instance); 530 vdc->state = VDC_STATE_RESETTING; 531 cv_signal(&vdc->initwait_cv); 532 } else if (vdc->state == VDC_STATE_FAILED) { 533 vdc->io_pending = B_TRUE; 534 cv_signal(&vdc->io_pending_cv); 535 } 536 mutex_exit(&vdc->lock); 537 538 /* now wait until state transitions to VDC_STATE_DETACH */ 539 thread_join(vdc->msg_proc_thr->t_did); 540 ASSERT(vdc->state == VDC_STATE_DETACH); 541 DMSG(vdc, 0, "[%d] Reset thread exit and join ..\n", 542 vdc->instance); 543 } 544 545 mutex_enter(&vdc->lock); 546 547 if (vdc->initialized & VDC_DRING) 548 vdc_destroy_descriptor_ring(vdc); 549 550 vdc_fini_ports(vdc); 551 552 if (vdc->eio_thread) { 553 eio_tid = vdc->eio_thread->t_did; 554 vdc->failfast_interval = 0; 555 ASSERT(vdc->num_servers == 0); 556 cv_signal(&vdc->eio_cv); 557 } else { 558 eio_tid = 0; 559 } 560 561 if (vdc->ownership & VDC_OWNERSHIP_WANTED) { 562 ownership_tid = vdc->ownership_thread->t_did; 563 vdc->ownership = VDC_OWNERSHIP_NONE; 564 cv_signal(&vdc->ownership_cv); 565 } else { 566 ownership_tid = 0; 567 } 568 569 mutex_exit(&vdc->lock); 570 571 if (eio_tid != 0) 572 thread_join(eio_tid); 573 574 if (ownership_tid != 0) 575 thread_join(ownership_tid); 576 577 if (vdc->initialized & VDC_MINOR) 578 ddi_remove_minor_node(dip, NULL); 579 580 if (vdc->io_stats) { 581 kstat_delete(vdc->io_stats); 582 vdc->io_stats = NULL; 583 } 584 585 if (vdc->err_stats) { 586 kstat_delete(vdc->err_stats); 587 vdc->err_stats = NULL; 588 } 589 590 if (vdc->initialized & VDC_LOCKS) { 591 mutex_destroy(&vdc->lock); 592 mutex_destroy(&vdc->read_lock); 593 mutex_destroy(&vdc->ownership_lock); 594 cv_destroy(&vdc->initwait_cv); 595 cv_destroy(&vdc->dring_free_cv); 596 cv_destroy(&vdc->membind_cv); 597 cv_destroy(&vdc->sync_blocked_cv); 598 cv_destroy(&vdc->read_cv); 599 cv_destroy(&vdc->running_cv); 600 cv_destroy(&vdc->io_pending_cv); 601 cv_destroy(&vdc->ownership_cv); 602 cv_destroy(&vdc->eio_cv); 603 } 604 605 if (vdc->minfo) 606 kmem_free(vdc->minfo, sizeof (struct dk_minfo)); 607 608 if (vdc->cinfo) 609 kmem_free(vdc->cinfo, sizeof (struct dk_cinfo)); 610 611 if (vdc->vtoc) 612 kmem_free(vdc->vtoc, sizeof (struct extvtoc)); 613 614 if (vdc->geom) 615 kmem_free(vdc->geom, sizeof (struct dk_geom)); 616 617 if (vdc->devid) { 618 ddi_devid_unregister(dip); 619 ddi_devid_free(vdc->devid); 620 } 621 622 if (vdc->initialized & VDC_SOFT_STATE) 623 ddi_soft_state_free(vdc_state, instance); 624 625 DMSG(vdc, 0, "[%d] End %p\n", instance, (void *)vdc); 626 627 return (DDI_SUCCESS); 628 } 629 630 631 static int 632 vdc_do_attach(dev_info_t *dip) 633 { 634 int instance; 635 vdc_t *vdc = NULL; 636 int status; 637 md_t *mdp; 638 mde_cookie_t vd_node; 639 640 ASSERT(dip != NULL); 641 642 instance = ddi_get_instance(dip); 643 if (ddi_soft_state_zalloc(vdc_state, instance) != DDI_SUCCESS) { 644 cmn_err(CE_NOTE, "[%d] Couldn't alloc state structure", 645 instance); 646 return (DDI_FAILURE); 647 } 648 649 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 650 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 651 return (DDI_FAILURE); 652 } 653 654 /* 655 * We assign the value to initialized in this case to zero out the 656 * variable and then set bits in it to indicate what has been done 657 */ 658 vdc->initialized = VDC_SOFT_STATE; 659 660 vdc_hz_min_ldc_delay = drv_usectohz(vdc_min_timeout_ldc); 661 vdc_hz_max_ldc_delay = drv_usectohz(vdc_max_timeout_ldc); 662 663 vdc->dip = dip; 664 vdc->instance = instance; 665 vdc->vdisk_type = VD_DISK_TYPE_UNK; 666 vdc->vdisk_label = VD_DISK_LABEL_UNK; 667 vdc->state = VDC_STATE_INIT; 668 vdc->lifecycle = VDC_LC_ATTACHING; 669 vdc->session_id = 0; 670 vdc->vdisk_bsize = DEV_BSIZE; 671 vdc->vio_bmask = 0; 672 vdc->vio_bshift = 0; 673 vdc->max_xfer_sz = maxphys / vdc->vdisk_bsize; 674 675 /* 676 * We assume, for now, that the vDisk server will export 'read' 677 * operations to us at a minimum (this is needed because of checks 678 * in vdc for supported operations early in the handshake process). 679 * The vDisk server will return ENOTSUP if this is not the case. 680 * The value will be overwritten during the attribute exchange with 681 * the bitmask of operations exported by server. 682 */ 683 vdc->operations = VD_OP_MASK_READ; 684 685 vdc->vtoc = NULL; 686 vdc->geom = NULL; 687 vdc->cinfo = NULL; 688 vdc->minfo = NULL; 689 690 mutex_init(&vdc->lock, NULL, MUTEX_DRIVER, NULL); 691 cv_init(&vdc->initwait_cv, NULL, CV_DRIVER, NULL); 692 cv_init(&vdc->dring_free_cv, NULL, CV_DRIVER, NULL); 693 cv_init(&vdc->membind_cv, NULL, CV_DRIVER, NULL); 694 cv_init(&vdc->running_cv, NULL, CV_DRIVER, NULL); 695 cv_init(&vdc->io_pending_cv, NULL, CV_DRIVER, NULL); 696 697 vdc->io_pending = B_FALSE; 698 vdc->threads_pending = 0; 699 vdc->sync_op_blocked = B_FALSE; 700 cv_init(&vdc->sync_blocked_cv, NULL, CV_DRIVER, NULL); 701 702 mutex_init(&vdc->ownership_lock, NULL, MUTEX_DRIVER, NULL); 703 cv_init(&vdc->ownership_cv, NULL, CV_DRIVER, NULL); 704 cv_init(&vdc->eio_cv, NULL, CV_DRIVER, NULL); 705 706 /* init blocking msg read functionality */ 707 mutex_init(&vdc->read_lock, NULL, MUTEX_DRIVER, NULL); 708 cv_init(&vdc->read_cv, NULL, CV_DRIVER, NULL); 709 vdc->read_state = VDC_READ_IDLE; 710 711 vdc->initialized |= VDC_LOCKS; 712 713 /* get device and port MD node for this disk instance */ 714 if (vdc_get_md_node(dip, &mdp, &vd_node) != 0) { 715 cmn_err(CE_NOTE, "[%d] Could not get machine description node", 716 instance); 717 return (DDI_FAILURE); 718 } 719 720 if (vdc_init_ports(vdc, mdp, vd_node) != 0) { 721 cmn_err(CE_NOTE, "[%d] Error initialising ports", instance); 722 return (DDI_FAILURE); 723 } 724 725 (void) md_fini_handle(mdp); 726 727 /* Create the kstats for saving the I/O statistics used by iostat(1M) */ 728 vdc_create_io_kstats(vdc); 729 vdc_create_err_kstats(vdc); 730 731 /* Initialize remaining structures before starting the msg thread */ 732 vdc->vdisk_label = VD_DISK_LABEL_UNK; 733 vdc->vtoc = kmem_zalloc(sizeof (struct extvtoc), KM_SLEEP); 734 vdc->geom = kmem_zalloc(sizeof (struct dk_geom), KM_SLEEP); 735 vdc->minfo = kmem_zalloc(sizeof (struct dk_minfo), KM_SLEEP); 736 737 /* initialize the thread responsible for managing state with server */ 738 vdc->msg_proc_thr = thread_create(NULL, 0, vdc_process_msg_thread, 739 vdc, 0, &p0, TS_RUN, minclsyspri); 740 if (vdc->msg_proc_thr == NULL) { 741 cmn_err(CE_NOTE, "[%d] Failed to create msg processing thread", 742 instance); 743 return (DDI_FAILURE); 744 } 745 746 /* 747 * If there are multiple servers then start the eio thread. 748 */ 749 if (vdc->num_servers > 1) { 750 vdc->eio_thread = thread_create(NULL, 0, vdc_eio_thread, vdc, 0, 751 &p0, TS_RUN, v.v_maxsyspri - 2); 752 if (vdc->eio_thread == NULL) { 753 cmn_err(CE_NOTE, "[%d] Failed to create error " 754 "I/O thread", instance); 755 return (DDI_FAILURE); 756 } 757 } 758 759 vdc->initialized |= VDC_THREAD; 760 761 atomic_inc_32(&vdc_instance_count); 762 763 /* 764 * Check the disk label. This will send requests and do the handshake. 765 * We don't really care about the disk label now. What we really need is 766 * the handshake do be done so that we know the type of the disk (slice 767 * or full disk) and the appropriate device nodes can be created. 768 */ 769 770 mutex_enter(&vdc->lock); 771 (void) vdc_validate_geometry(vdc); 772 mutex_exit(&vdc->lock); 773 774 /* 775 * Now that we have the device info we can create the device nodes 776 */ 777 status = vdc_create_device_nodes(vdc); 778 if (status) { 779 DMSG(vdc, 0, "[%d] Failed to create device nodes", 780 instance); 781 goto return_status; 782 } 783 784 /* 785 * Fill in the fields of the error statistics kstat that were not 786 * available when creating the kstat 787 */ 788 vdc_set_err_kstats(vdc); 789 ddi_report_dev(dip); 790 ASSERT(vdc->lifecycle == VDC_LC_ONLINE || 791 vdc->lifecycle == VDC_LC_ONLINE_PENDING); 792 DMSG(vdc, 0, "[%d] Attach tasks successful\n", instance); 793 794 return_status: 795 DMSG(vdc, 0, "[%d] Attach completed\n", instance); 796 return (status); 797 } 798 799 static int 800 vdc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 801 { 802 int status; 803 804 switch (cmd) { 805 case DDI_ATTACH: 806 if ((status = vdc_do_attach(dip)) != 0) 807 (void) vdc_detach(dip, DDI_DETACH); 808 return (status); 809 case DDI_RESUME: 810 /* nothing to do for this non-device */ 811 return (DDI_SUCCESS); 812 default: 813 return (DDI_FAILURE); 814 } 815 } 816 817 static int 818 vdc_do_ldc_init(vdc_t *vdc, vdc_server_t *srvr) 819 { 820 int status = 0; 821 ldc_status_t ldc_state; 822 ldc_attr_t ldc_attr; 823 824 ASSERT(vdc != NULL); 825 ASSERT(srvr != NULL); 826 827 ldc_attr.devclass = LDC_DEV_BLK; 828 ldc_attr.instance = vdc->instance; 829 ldc_attr.mode = LDC_MODE_UNRELIABLE; /* unreliable transport */ 830 ldc_attr.mtu = VD_LDC_MTU; 831 832 if ((srvr->state & VDC_LDC_INIT) == 0) { 833 status = ldc_init(srvr->ldc_id, &ldc_attr, 834 &srvr->ldc_handle); 835 if (status != 0) { 836 DMSG(vdc, 0, "[%d] ldc_init(chan %ld) returned %d", 837 vdc->instance, srvr->ldc_id, status); 838 return (status); 839 } 840 srvr->state |= VDC_LDC_INIT; 841 } 842 status = ldc_status(srvr->ldc_handle, &ldc_state); 843 if (status != 0) { 844 DMSG(vdc, 0, "[%d] Cannot discover LDC status [err=%d]", 845 vdc->instance, status); 846 goto init_exit; 847 } 848 srvr->ldc_state = ldc_state; 849 850 if ((srvr->state & VDC_LDC_CB) == 0) { 851 status = ldc_reg_callback(srvr->ldc_handle, vdc_handle_cb, 852 (caddr_t)srvr); 853 if (status != 0) { 854 DMSG(vdc, 0, "[%d] LDC callback reg. failed (%d)", 855 vdc->instance, status); 856 goto init_exit; 857 } 858 srvr->state |= VDC_LDC_CB; 859 } 860 861 /* 862 * At this stage we have initialised LDC, we will now try and open 863 * the connection. 864 */ 865 if (srvr->ldc_state == LDC_INIT) { 866 status = ldc_open(srvr->ldc_handle); 867 if (status != 0) { 868 DMSG(vdc, 0, "[%d] ldc_open(chan %ld) returned %d", 869 vdc->instance, srvr->ldc_id, status); 870 goto init_exit; 871 } 872 srvr->state |= VDC_LDC_OPEN; 873 } 874 875 init_exit: 876 if (status) { 877 vdc_terminate_ldc(vdc, srvr); 878 } 879 880 return (status); 881 } 882 883 static int 884 vdc_start_ldc_connection(vdc_t *vdc) 885 { 886 int status = 0; 887 888 ASSERT(vdc != NULL); 889 890 ASSERT(MUTEX_HELD(&vdc->lock)); 891 892 status = vdc_do_ldc_up(vdc); 893 894 DMSG(vdc, 0, "[%d] Finished bringing up LDC\n", vdc->instance); 895 896 return (status); 897 } 898 899 static int 900 vdc_stop_ldc_connection(vdc_t *vdcp) 901 { 902 int status; 903 904 ASSERT(vdcp != NULL); 905 906 ASSERT(MUTEX_HELD(&vdcp->lock)); 907 908 DMSG(vdcp, 0, ": Resetting connection to vDisk server : state %d\n", 909 vdcp->state); 910 911 status = ldc_down(vdcp->curr_server->ldc_handle); 912 DMSG(vdcp, 0, "ldc_down() = %d\n", status); 913 914 vdcp->initialized &= ~VDC_HANDSHAKE; 915 DMSG(vdcp, 0, "initialized=%x\n", vdcp->initialized); 916 917 return (status); 918 } 919 920 static void 921 vdc_create_io_kstats(vdc_t *vdc) 922 { 923 if (vdc->io_stats != NULL) { 924 DMSG(vdc, 0, "[%d] I/O kstat already exists\n", vdc->instance); 925 return; 926 } 927 928 vdc->io_stats = kstat_create(VDC_DRIVER_NAME, vdc->instance, NULL, 929 "disk", KSTAT_TYPE_IO, 1, KSTAT_FLAG_PERSISTENT); 930 if (vdc->io_stats != NULL) { 931 vdc->io_stats->ks_lock = &vdc->lock; 932 kstat_install(vdc->io_stats); 933 } else { 934 cmn_err(CE_NOTE, "[%d] Failed to create kstat: I/O statistics" 935 " will not be gathered", vdc->instance); 936 } 937 } 938 939 static void 940 vdc_create_err_kstats(vdc_t *vdc) 941 { 942 vd_err_stats_t *stp; 943 char kstatmodule_err[KSTAT_STRLEN]; 944 char kstatname[KSTAT_STRLEN]; 945 int ndata = (sizeof (vd_err_stats_t) / sizeof (kstat_named_t)); 946 int instance = vdc->instance; 947 948 if (vdc->err_stats != NULL) { 949 DMSG(vdc, 0, "[%d] ERR kstat already exists\n", vdc->instance); 950 return; 951 } 952 953 (void) snprintf(kstatmodule_err, sizeof (kstatmodule_err), 954 "%serr", VDC_DRIVER_NAME); 955 (void) snprintf(kstatname, sizeof (kstatname), 956 "%s%d,err", VDC_DRIVER_NAME, instance); 957 958 vdc->err_stats = kstat_create(kstatmodule_err, instance, kstatname, 959 "device_error", KSTAT_TYPE_NAMED, ndata, KSTAT_FLAG_PERSISTENT); 960 961 if (vdc->err_stats == NULL) { 962 cmn_err(CE_NOTE, "[%d] Failed to create kstat: Error statistics" 963 " will not be gathered", instance); 964 return; 965 } 966 967 stp = (vd_err_stats_t *)vdc->err_stats->ks_data; 968 kstat_named_init(&stp->vd_softerrs, "Soft Errors", 969 KSTAT_DATA_UINT32); 970 kstat_named_init(&stp->vd_transerrs, "Transport Errors", 971 KSTAT_DATA_UINT32); 972 kstat_named_init(&stp->vd_protoerrs, "Protocol Errors", 973 KSTAT_DATA_UINT32); 974 kstat_named_init(&stp->vd_vid, "Vendor", 975 KSTAT_DATA_CHAR); 976 kstat_named_init(&stp->vd_pid, "Product", 977 KSTAT_DATA_CHAR); 978 kstat_named_init(&stp->vd_capacity, "Size", 979 KSTAT_DATA_ULONGLONG); 980 981 vdc->err_stats->ks_update = nulldev; 982 983 kstat_install(vdc->err_stats); 984 } 985 986 static void 987 vdc_set_err_kstats(vdc_t *vdc) 988 { 989 vd_err_stats_t *stp; 990 991 if (vdc->err_stats == NULL) 992 return; 993 994 mutex_enter(&vdc->lock); 995 996 stp = (vd_err_stats_t *)vdc->err_stats->ks_data; 997 ASSERT(stp != NULL); 998 999 stp->vd_capacity.value.ui64 = vdc->vdisk_size * vdc->vdisk_bsize; 1000 (void) strcpy(stp->vd_vid.value.c, "SUN"); 1001 (void) strcpy(stp->vd_pid.value.c, "VDSK"); 1002 1003 mutex_exit(&vdc->lock); 1004 } 1005 1006 static int 1007 vdc_create_device_nodes_efi(vdc_t *vdc) 1008 { 1009 ddi_remove_minor_node(vdc->dip, "h"); 1010 ddi_remove_minor_node(vdc->dip, "h,raw"); 1011 1012 if (ddi_create_minor_node(vdc->dip, "wd", S_IFBLK, 1013 VD_MAKE_DEV(vdc->instance, VD_EFI_WD_SLICE), 1014 DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1015 cmn_err(CE_NOTE, "[%d] Couldn't add block node 'wd'", 1016 vdc->instance); 1017 return (EIO); 1018 } 1019 1020 /* if any device node is created we set this flag */ 1021 vdc->initialized |= VDC_MINOR; 1022 1023 if (ddi_create_minor_node(vdc->dip, "wd,raw", S_IFCHR, 1024 VD_MAKE_DEV(vdc->instance, VD_EFI_WD_SLICE), 1025 DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1026 cmn_err(CE_NOTE, "[%d] Couldn't add block node 'wd,raw'", 1027 vdc->instance); 1028 return (EIO); 1029 } 1030 1031 return (0); 1032 } 1033 1034 static int 1035 vdc_create_device_nodes_vtoc(vdc_t *vdc) 1036 { 1037 ddi_remove_minor_node(vdc->dip, "wd"); 1038 ddi_remove_minor_node(vdc->dip, "wd,raw"); 1039 1040 if (ddi_create_minor_node(vdc->dip, "h", S_IFBLK, 1041 VD_MAKE_DEV(vdc->instance, VD_EFI_WD_SLICE), 1042 DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1043 cmn_err(CE_NOTE, "[%d] Couldn't add block node 'h'", 1044 vdc->instance); 1045 return (EIO); 1046 } 1047 1048 /* if any device node is created we set this flag */ 1049 vdc->initialized |= VDC_MINOR; 1050 1051 if (ddi_create_minor_node(vdc->dip, "h,raw", S_IFCHR, 1052 VD_MAKE_DEV(vdc->instance, VD_EFI_WD_SLICE), 1053 DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1054 cmn_err(CE_NOTE, "[%d] Couldn't add block node 'h,raw'", 1055 vdc->instance); 1056 return (EIO); 1057 } 1058 1059 return (0); 1060 } 1061 1062 /* 1063 * Function: 1064 * vdc_create_device_nodes 1065 * 1066 * Description: 1067 * This function creates the block and character device nodes under 1068 * /devices. It is called as part of the attach(9E) of the instance 1069 * during the handshake with vds after vds has sent the attributes 1070 * to vdc. 1071 * 1072 * If the device is of type VD_DISK_TYPE_SLICE then the minor node 1073 * of 2 is used in keeping with the Solaris convention that slice 2 1074 * refers to a whole disk. Slices start at 'a' 1075 * 1076 * Parameters: 1077 * vdc - soft state pointer 1078 * 1079 * Return Values 1080 * 0 - Success 1081 * EIO - Failed to create node 1082 */ 1083 static int 1084 vdc_create_device_nodes(vdc_t *vdc) 1085 { 1086 char name[sizeof ("s,raw")]; 1087 dev_info_t *dip = NULL; 1088 int instance, status; 1089 int num_slices = 1; 1090 int i; 1091 1092 ASSERT(vdc != NULL); 1093 1094 instance = vdc->instance; 1095 dip = vdc->dip; 1096 1097 switch (vdc->vdisk_type) { 1098 case VD_DISK_TYPE_DISK: 1099 case VD_DISK_TYPE_UNK: 1100 num_slices = V_NUMPAR; 1101 break; 1102 case VD_DISK_TYPE_SLICE: 1103 num_slices = 1; 1104 break; 1105 default: 1106 ASSERT(0); 1107 } 1108 1109 /* 1110 * Minor nodes are different for EFI disks: EFI disks do not have 1111 * a minor node 'g' for the minor number corresponding to slice 1112 * VD_EFI_WD_SLICE (slice 7) instead they have a minor node 'wd' 1113 * representing the whole disk. 1114 */ 1115 for (i = 0; i < num_slices; i++) { 1116 1117 if (i == VD_EFI_WD_SLICE) { 1118 if (vdc->vdisk_label == VD_DISK_LABEL_EFI) 1119 status = vdc_create_device_nodes_efi(vdc); 1120 else 1121 status = vdc_create_device_nodes_vtoc(vdc); 1122 if (status != 0) 1123 return (status); 1124 continue; 1125 } 1126 1127 (void) snprintf(name, sizeof (name), "%c", 'a' + i); 1128 if (ddi_create_minor_node(dip, name, S_IFBLK, 1129 VD_MAKE_DEV(instance, i), DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1130 cmn_err(CE_NOTE, "[%d] Couldn't add block node '%s'", 1131 instance, name); 1132 return (EIO); 1133 } 1134 1135 /* if any device node is created we set this flag */ 1136 vdc->initialized |= VDC_MINOR; 1137 1138 (void) snprintf(name, sizeof (name), "%c%s", 'a' + i, ",raw"); 1139 1140 if (ddi_create_minor_node(dip, name, S_IFCHR, 1141 VD_MAKE_DEV(instance, i), DDI_NT_BLOCK, 0) != DDI_SUCCESS) { 1142 cmn_err(CE_NOTE, "[%d] Couldn't add raw node '%s'", 1143 instance, name); 1144 return (EIO); 1145 } 1146 } 1147 1148 return (0); 1149 } 1150 1151 /* 1152 * Driver prop_op(9e) entry point function. Return the number of blocks for 1153 * the partition in question or forward the request to the property facilities. 1154 */ 1155 static int 1156 vdc_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags, 1157 char *name, caddr_t valuep, int *lengthp) 1158 { 1159 int instance = ddi_get_instance(dip); 1160 vdc_t *vdc; 1161 uint64_t nblocks; 1162 uint_t blksize; 1163 1164 vdc = ddi_get_soft_state(vdc_state, instance); 1165 1166 if (dev == DDI_DEV_T_ANY || vdc == NULL) { 1167 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 1168 name, valuep, lengthp)); 1169 } 1170 1171 mutex_enter(&vdc->lock); 1172 (void) vdc_validate_geometry(vdc); 1173 if (vdc->vdisk_label == VD_DISK_LABEL_UNK) { 1174 mutex_exit(&vdc->lock); 1175 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 1176 name, valuep, lengthp)); 1177 } 1178 nblocks = vdc->slice[VDCPART(dev)].nblocks; 1179 blksize = vdc->vdisk_bsize; 1180 mutex_exit(&vdc->lock); 1181 1182 return (ddi_prop_op_nblocks_blksize(dev, dip, prop_op, mod_flags, 1183 name, valuep, lengthp, nblocks, blksize)); 1184 } 1185 1186 /* 1187 * Function: 1188 * vdc_is_opened 1189 * 1190 * Description: 1191 * This function checks if any slice of a given virtual disk is 1192 * currently opened. 1193 * 1194 * Parameters: 1195 * vdc - soft state pointer 1196 * 1197 * Return Values 1198 * B_TRUE - at least one slice is opened. 1199 * B_FALSE - no slice is opened. 1200 */ 1201 static boolean_t 1202 vdc_is_opened(vdc_t *vdc) 1203 { 1204 int i; 1205 1206 /* check if there's any layered open */ 1207 for (i = 0; i < V_NUMPAR; i++) { 1208 if (vdc->open_lyr[i] > 0) 1209 return (B_TRUE); 1210 } 1211 1212 /* check if there is any other kind of open */ 1213 for (i = 0; i < OTYPCNT; i++) { 1214 if (vdc->open[i] != 0) 1215 return (B_TRUE); 1216 } 1217 1218 return (B_FALSE); 1219 } 1220 1221 static int 1222 vdc_mark_opened(vdc_t *vdc, int slice, int flag, int otyp) 1223 { 1224 uint8_t slicemask; 1225 int i; 1226 1227 ASSERT(otyp < OTYPCNT); 1228 ASSERT(slice < V_NUMPAR); 1229 ASSERT(MUTEX_HELD(&vdc->lock)); 1230 1231 slicemask = 1 << slice; 1232 1233 /* 1234 * If we have a single-slice disk which was unavailable during the 1235 * attach then a device was created for each 8 slices. Now that 1236 * the type is known, we prevent opening any slice other than 0 1237 * even if a device still exists. 1238 */ 1239 if (vdc->vdisk_type == VD_DISK_TYPE_SLICE && slice != 0) 1240 return (EIO); 1241 1242 /* check if slice is already exclusively opened */ 1243 if (vdc->open_excl & slicemask) 1244 return (EBUSY); 1245 1246 /* if open exclusive, check if slice is already opened */ 1247 if (flag & FEXCL) { 1248 if (vdc->open_lyr[slice] > 0) 1249 return (EBUSY); 1250 for (i = 0; i < OTYPCNT; i++) { 1251 if (vdc->open[i] & slicemask) 1252 return (EBUSY); 1253 } 1254 vdc->open_excl |= slicemask; 1255 } 1256 1257 /* mark slice as opened */ 1258 if (otyp == OTYP_LYR) { 1259 vdc->open_lyr[slice]++; 1260 } else { 1261 vdc->open[otyp] |= slicemask; 1262 } 1263 1264 return (0); 1265 } 1266 1267 static void 1268 vdc_mark_closed(vdc_t *vdc, int slice, int flag, int otyp) 1269 { 1270 uint8_t slicemask; 1271 1272 ASSERT(otyp < OTYPCNT); 1273 ASSERT(slice < V_NUMPAR); 1274 ASSERT(MUTEX_HELD(&vdc->lock)); 1275 1276 slicemask = 1 << slice; 1277 1278 if (otyp == OTYP_LYR) { 1279 ASSERT(vdc->open_lyr[slice] > 0); 1280 vdc->open_lyr[slice]--; 1281 } else { 1282 vdc->open[otyp] &= ~slicemask; 1283 } 1284 1285 if (flag & FEXCL) 1286 vdc->open_excl &= ~slicemask; 1287 } 1288 1289 static int 1290 vdc_open(dev_t *dev, int flag, int otyp, cred_t *cred) 1291 { 1292 _NOTE(ARGUNUSED(cred)) 1293 1294 int instance, nodelay; 1295 int slice, status = 0; 1296 vdc_t *vdc; 1297 1298 ASSERT(dev != NULL); 1299 instance = VDCUNIT(*dev); 1300 1301 if (otyp >= OTYPCNT) 1302 return (EINVAL); 1303 1304 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 1305 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 1306 return (ENXIO); 1307 } 1308 1309 DMSG(vdc, 0, "minor = %d flag = %x, otyp = %x\n", 1310 getminor(*dev), flag, otyp); 1311 1312 slice = VDCPART(*dev); 1313 1314 nodelay = flag & (FNDELAY | FNONBLOCK); 1315 1316 if ((flag & FWRITE) && (!nodelay) && 1317 !(VD_OP_SUPPORTED(vdc->operations, VD_OP_BWRITE))) { 1318 return (EROFS); 1319 } 1320 1321 mutex_enter(&vdc->lock); 1322 1323 status = vdc_mark_opened(vdc, slice, flag, otyp); 1324 1325 if (status != 0) { 1326 mutex_exit(&vdc->lock); 1327 return (status); 1328 } 1329 1330 /* 1331 * If the disk type is unknown then we have to wait for the 1332 * handshake to complete because we don't know if the slice 1333 * device we are opening effectively exists. 1334 */ 1335 if (vdc->vdisk_type != VD_DISK_TYPE_UNK && nodelay) { 1336 1337 /* don't resubmit a validate request if there's already one */ 1338 if (vdc->validate_pending > 0) { 1339 mutex_exit(&vdc->lock); 1340 return (0); 1341 } 1342 1343 /* call vdc_validate() asynchronously to avoid blocking */ 1344 if (taskq_dispatch(system_taskq, vdc_validate_task, 1345 (void *)vdc, TQ_NOSLEEP) == TASKQID_INVALID) { 1346 vdc_mark_closed(vdc, slice, flag, otyp); 1347 mutex_exit(&vdc->lock); 1348 return (ENXIO); 1349 } 1350 1351 vdc->validate_pending++; 1352 mutex_exit(&vdc->lock); 1353 return (0); 1354 } 1355 1356 mutex_exit(&vdc->lock); 1357 1358 vdc_validate(vdc); 1359 1360 mutex_enter(&vdc->lock); 1361 1362 if (vdc->vdisk_type == VD_DISK_TYPE_UNK || 1363 (vdc->vdisk_type == VD_DISK_TYPE_SLICE && slice != 0) || 1364 (!nodelay && (vdc->vdisk_label == VD_DISK_LABEL_UNK || 1365 vdc->slice[slice].nblocks == 0))) { 1366 vdc_mark_closed(vdc, slice, flag, otyp); 1367 status = EIO; 1368 } 1369 1370 mutex_exit(&vdc->lock); 1371 1372 return (status); 1373 } 1374 1375 static int 1376 vdc_close(dev_t dev, int flag, int otyp, cred_t *cred) 1377 { 1378 _NOTE(ARGUNUSED(cred)) 1379 1380 int instance; 1381 int slice; 1382 int rv, rval; 1383 vdc_t *vdc; 1384 1385 instance = VDCUNIT(dev); 1386 1387 if (otyp >= OTYPCNT) 1388 return (EINVAL); 1389 1390 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 1391 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 1392 return (ENXIO); 1393 } 1394 1395 DMSG(vdc, 0, "[%d] flag = %x, otyp = %x\n", instance, flag, otyp); 1396 1397 slice = VDCPART(dev); 1398 1399 /* 1400 * Attempt to flush the W$ on a close operation. If this is 1401 * not a supported IOCTL command or the backing device is read-only 1402 * do not fail the close operation. 1403 */ 1404 rv = vd_process_ioctl(dev, DKIOCFLUSHWRITECACHE, NULL, FKIOCTL, &rval); 1405 1406 if (rv != 0 && rv != ENOTSUP && rv != ENOTTY && rv != EROFS) { 1407 DMSG(vdc, 0, "[%d] flush failed with error %d on close\n", 1408 instance, rv); 1409 return (EIO); 1410 } 1411 1412 mutex_enter(&vdc->lock); 1413 vdc_mark_closed(vdc, slice, flag, otyp); 1414 mutex_exit(&vdc->lock); 1415 1416 return (0); 1417 } 1418 1419 static int 1420 vdc_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, int *rvalp) 1421 { 1422 _NOTE(ARGUNUSED(credp)) 1423 1424 return (vd_process_ioctl(dev, cmd, (caddr_t)arg, mode, rvalp)); 1425 } 1426 1427 static int 1428 vdc_print(dev_t dev, char *str) 1429 { 1430 cmn_err(CE_NOTE, "vdc%d: %s", VDCUNIT(dev), str); 1431 return (0); 1432 } 1433 1434 static int 1435 vdc_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) 1436 { 1437 int rv, flags; 1438 size_t nbytes = nblk * DEV_BSIZE; 1439 int instance = VDCUNIT(dev); 1440 vdc_t *vdc = NULL; 1441 diskaddr_t vio_blkno; 1442 1443 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 1444 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 1445 return (ENXIO); 1446 } 1447 1448 DMSG(vdc, 2, "[%d] dump %ld bytes at block 0x%lx : addr=0x%p\n", 1449 instance, nbytes, blkno, (void *)addr); 1450 1451 /* convert logical block to vio block */ 1452 if ((blkno & vdc->vio_bmask) != 0) { 1453 DMSG(vdc, 0, "Misaligned block number (%lu)\n", blkno); 1454 return (EINVAL); 1455 } 1456 vio_blkno = blkno >> vdc->vio_bshift; 1457 1458 /* 1459 * If we are panicking, we need the state to be "running" so that we 1460 * can submit I/Os, but we don't want to check for any backend error. 1461 */ 1462 flags = (ddi_in_panic())? VDC_OP_STATE_RUNNING : VDC_OP_NORMAL; 1463 1464 rv = vdc_do_op(vdc, VD_OP_BWRITE, addr, nbytes, VDCPART(dev), 1465 vio_blkno, NULL, VIO_write_dir, flags); 1466 1467 if (rv) { 1468 DMSG(vdc, 0, "Failed to do a disk dump (err=%d)\n", rv); 1469 return (rv); 1470 } 1471 1472 DMSG(vdc, 0, "[%d] End\n", instance); 1473 1474 return (0); 1475 } 1476 1477 /* -------------------------------------------------------------------------- */ 1478 1479 /* 1480 * Disk access routines 1481 * 1482 */ 1483 1484 /* 1485 * vdc_strategy() 1486 * 1487 * Return Value: 1488 * 0: As per strategy(9E), the strategy() function must return 0 1489 * [ bioerror(9f) sets b_flags to the proper error code ] 1490 */ 1491 static int 1492 vdc_strategy(struct buf *buf) 1493 { 1494 diskaddr_t vio_blkno; 1495 vdc_t *vdc = NULL; 1496 int instance = VDCUNIT(buf->b_edev); 1497 int op = (buf->b_flags & B_READ) ? VD_OP_BREAD : VD_OP_BWRITE; 1498 int slice; 1499 1500 if ((vdc = ddi_get_soft_state(vdc_state, instance)) == NULL) { 1501 cmn_err(CE_NOTE, "[%d] Couldn't get state structure", instance); 1502 bioerror(buf, ENXIO); 1503 biodone(buf); 1504 return (0); 1505 } 1506 1507 DMSG(vdc, 2, "[%d] %s %ld bytes at block %llx : b_addr=0x%p\n", 1508 instance, (buf->b_flags & B_READ) ? "Read" : "Write", 1509 buf->b_bcount, buf->b_lblkno, (void *)buf->b_un.b_addr); 1510 1511 bp_mapin(buf); 1512 1513 if ((long)buf->b_private == VD_SLICE_NONE) { 1514 /* I/O using an absolute disk offset */ 1515 slice = VD_SLICE_NONE; 1516 } else { 1517 slice = VDCPART(buf->b_edev); 1518 } 1519 1520 /* 1521 * In the buf structure, b_lblkno represents a logical block number 1522 * using a block size of 512 bytes. For the VIO request, this block 1523 * number has to be converted to be represented with the block size 1524 * used by the VIO protocol. 1525 */ 1526 if ((buf->b_lblkno & vdc->vio_bmask) != 0) { 1527 bioerror(buf, EINVAL); 1528 biodone(buf); 1529 return (0); 1530 } 1531 vio_blkno = buf->b_lblkno >> vdc->vio_bshift; 1532 1533 /* submit the I/O, any error will be reported in the buf structure */ 1534 (void) vdc_do_op(vdc, op, (caddr_t)buf->b_un.b_addr, 1535 buf->b_bcount, slice, vio_blkno, 1536 buf, (op == VD_OP_BREAD) ? VIO_read_dir : VIO_write_dir, 1537 VDC_OP_NORMAL); 1538 1539 return (0); 1540 } 1541 1542 /* 1543 * Function: 1544 * vdc_min 1545 * 1546 * Description: 1547 * Routine to limit the size of a data transfer. Used in 1548 * conjunction with physio(9F). 1549 * 1550 * Arguments: 1551 * bp - pointer to the indicated buf(9S) struct. 1552 * 1553 */ 1554 static void 1555 vdc_min(struct buf *bufp) 1556 { 1557 vdc_t *vdc = NULL; 1558 int instance = VDCUNIT(bufp->b_edev); 1559 1560 vdc = ddi_get_soft_state(vdc_state, instance); 1561 VERIFY(vdc != NULL); 1562 1563 if (bufp->b_bcount > (vdc->max_xfer_sz * vdc->vdisk_bsize)) { 1564 bufp->b_bcount = vdc->max_xfer_sz * vdc->vdisk_bsize; 1565 } 1566 } 1567 1568 static int 1569 vdc_read(dev_t dev, struct uio *uio, cred_t *cred) 1570 { 1571 _NOTE(ARGUNUSED(cred)) 1572 1573 DMSGX(1, "[%d] Entered", VDCUNIT(dev)); 1574 return (physio(vdc_strategy, NULL, dev, B_READ, vdc_min, uio)); 1575 } 1576 1577 static int 1578 vdc_write(dev_t dev, struct uio *uio, cred_t *cred) 1579 { 1580 _NOTE(ARGUNUSED(cred)) 1581 1582 DMSGX(1, "[%d] Entered", VDCUNIT(dev)); 1583 return (physio(vdc_strategy, NULL, dev, B_WRITE, vdc_min, uio)); 1584 } 1585 1586 static int 1587 vdc_aread(dev_t dev, struct aio_req *aio, cred_t *cred) 1588 { 1589 _NOTE(ARGUNUSED(cred)) 1590 1591 DMSGX(1, "[%d] Entered", VDCUNIT(dev)); 1592 return (aphysio(vdc_strategy, anocancel, dev, B_READ, vdc_min, aio)); 1593 } 1594 1595 static int 1596 vdc_awrite(dev_t dev, struct aio_req *aio, cred_t *cred) 1597 { 1598 _NOTE(ARGUNUSED(cred)) 1599 1600 DMSGX(1, "[%d] Entered", VDCUNIT(dev)); 1601 return (aphysio(vdc_strategy, anocancel, dev, B_WRITE, vdc_min, aio)); 1602 } 1603 1604 1605 /* -------------------------------------------------------------------------- */ 1606 1607 /* 1608 * Handshake support 1609 */ 1610 1611 1612 /* 1613 * Function: 1614 * vdc_init_ver_negotiation() 1615 * 1616 * Description: 1617 * 1618 * Arguments: 1619 * vdc - soft state pointer for this instance of the device driver. 1620 * 1621 * Return Code: 1622 * 0 - Success 1623 */ 1624 static int 1625 vdc_init_ver_negotiation(vdc_t *vdc, vio_ver_t ver) 1626 { 1627 vio_ver_msg_t pkt; 1628 size_t msglen = sizeof (pkt); 1629 int status = -1; 1630 1631 ASSERT(vdc != NULL); 1632 ASSERT(mutex_owned(&vdc->lock)); 1633 1634 DMSG(vdc, 0, "[%d] Entered.\n", vdc->instance); 1635 1636 /* 1637 * set the Session ID to a unique value 1638 * (the lower 32 bits of the clock tick) 1639 */ 1640 vdc->session_id = ((uint32_t)gettick() & 0xffffffff); 1641 DMSG(vdc, 0, "[%d] Set SID to 0x%lx\n", vdc->instance, vdc->session_id); 1642 1643 pkt.tag.vio_msgtype = VIO_TYPE_CTRL; 1644 pkt.tag.vio_subtype = VIO_SUBTYPE_INFO; 1645 pkt.tag.vio_subtype_env = VIO_VER_INFO; 1646 pkt.tag.vio_sid = vdc->session_id; 1647 pkt.dev_class = VDEV_DISK; 1648 pkt.ver_major = ver.major; 1649 pkt.ver_minor = ver.minor; 1650 1651 status = vdc_send(vdc, (caddr_t)&pkt, &msglen); 1652 DMSG(vdc, 0, "[%d] Ver info sent (status = %d)\n", 1653 vdc->instance, status); 1654 if ((status != 0) || (msglen != sizeof (vio_ver_msg_t))) { 1655 DMSG(vdc, 0, "[%d] Failed to send Ver negotiation info: " 1656 "id(%lx) rv(%d) size(%ld)", vdc->instance, 1657 vdc->curr_server->ldc_handle, status, msglen); 1658 if (msglen != sizeof (vio_ver_msg_t)) 1659 status = ENOMSG; 1660 } 1661 1662 return (status); 1663 } 1664 1665 /* 1666 * Function: 1667 * vdc_ver_negotiation() 1668 * 1669 * Description: 1670 * 1671 * Arguments: 1672 * vdcp - soft state pointer for this instance of the device driver. 1673 * 1674 * Return Code: 1675 * 0 - Success 1676 */ 1677 static int 1678 vdc_ver_negotiation(vdc_t *vdcp) 1679 { 1680 vio_msg_t vio_msg; 1681 int status; 1682 1683 if (status = vdc_init_ver_negotiation(vdcp, vdc_version[0])) 1684 return (status); 1685 1686 /* release lock and wait for response */ 1687 mutex_exit(&vdcp->lock); 1688 status = vdc_wait_for_response(vdcp, &vio_msg); 1689 mutex_enter(&vdcp->lock); 1690 if (status) { 1691 DMSG(vdcp, 0, 1692 "[%d] Failed waiting for Ver negotiation response, rv(%d)", 1693 vdcp->instance, status); 1694 return (status); 1695 } 1696 1697 /* check type and sub_type ... */ 1698 if (vio_msg.tag.vio_msgtype != VIO_TYPE_CTRL || 1699 vio_msg.tag.vio_subtype == VIO_SUBTYPE_INFO) { 1700 DMSG(vdcp, 0, "[%d] Invalid ver negotiation response\n", 1701 vdcp->instance); 1702 return (EPROTO); 1703 } 1704 1705 return (vdc_handle_ver_msg(vdcp, (vio_ver_msg_t *)&vio_msg)); 1706 } 1707 1708 /* 1709 * Function: 1710 * vdc_init_attr_negotiation() 1711 * 1712 * Description: 1713 * 1714 * Arguments: 1715 * vdc - soft state pointer for this instance of the device driver. 1716 * 1717 * Return Code: 1718 * 0 - Success 1719 */ 1720 static int 1721 vdc_init_attr_negotiation(vdc_t *vdc) 1722 { 1723 vd_attr_msg_t pkt; 1724 size_t msglen = sizeof (pkt); 1725 int status; 1726 1727 ASSERT(vdc != NULL); 1728 ASSERT(mutex_owned(&vdc->lock)); 1729 1730 DMSG(vdc, 0, "[%d] entered\n", vdc->instance); 1731 1732 /* fill in tag */ 1733 pkt.tag.vio_msgtype = VIO_TYPE_CTRL; 1734 pkt.tag.vio_subtype = VIO_SUBTYPE_INFO; 1735 pkt.tag.vio_subtype_env = VIO_ATTR_INFO; 1736 pkt.tag.vio_sid = vdc->session_id; 1737 /* fill in payload */ 1738 pkt.max_xfer_sz = vdc->max_xfer_sz; 1739 pkt.vdisk_block_size = vdc->vdisk_bsize; 1740 pkt.xfer_mode = VIO_DRING_MODE_V1_0; 1741 pkt.operations = 0; /* server will set bits of valid operations */ 1742 pkt.vdisk_type = 0; /* server will set to valid device type */ 1743 pkt.vdisk_media = 0; /* server will set to valid media type */ 1744 pkt.vdisk_size = 0; /* server will set to valid size */ 1745 1746 status = vdc_send(vdc, (caddr_t)&pkt, &msglen); 1747 DMSG(vdc, 0, "Attr info sent (status = %d)\n", status); 1748 1749 if ((status != 0) || (msglen != sizeof (vd_attr_msg_t))) { 1750 DMSG(vdc, 0, "[%d] Failed to send Attr negotiation info: " 1751 "id(%lx) rv(%d) size(%ld)", vdc->instance, 1752 vdc->curr_server->ldc_handle, status, msglen); 1753 if (msglen != sizeof (vd_attr_msg_t)) 1754 status = ENOMSG; 1755 } 1756 1757 return (status); 1758 } 1759 1760 /* 1761 * Function: 1762 * vdc_attr_negotiation() 1763 * 1764 * Description: 1765 * 1766 * Arguments: 1767 * vdc - soft state pointer for this instance of the device driver. 1768 * 1769 * Return Code: 1770 * 0 - Success 1771 */ 1772 static int 1773 vdc_attr_negotiation(vdc_t *vdcp) 1774 { 1775 int status; 1776 vio_msg_t vio_msg; 1777 1778 if (status = vdc_init_attr_negotiation(vdcp)) 1779 return (status); 1780 1781 /* release lock and wait for response */ 1782 mutex_exit(&vdcp->lock); 1783 status = vdc_wait_for_response(vdcp, &vio_msg); 1784 mutex_enter(&vdcp->lock); 1785 if (status) { 1786 DMSG(vdcp, 0, 1787 "[%d] Failed waiting for Attr negotiation response, rv(%d)", 1788 vdcp->instance, status); 1789 return (status); 1790 } 1791 1792 /* check type and sub_type ... */ 1793 if (vio_msg.tag.vio_msgtype != VIO_TYPE_CTRL || 1794 vio_msg.tag.vio_subtype == VIO_SUBTYPE_INFO) { 1795 DMSG(vdcp, 0, "[%d] Invalid attr negotiation response\n", 1796 vdcp->instance); 1797 return (EPROTO); 1798 } 1799 1800 return (vdc_handle_attr_msg(vdcp, (vd_attr_msg_t *)&vio_msg)); 1801 } 1802 1803 1804 /* 1805 * Function: 1806 * vdc_init_dring_negotiate() 1807 * 1808 * Description: 1809 * 1810 * Arguments: 1811 * vdc - soft state pointer for this instance of the device driver. 1812 * 1813 * Return Code: 1814 * 0 - Success 1815 */ 1816 static int 1817 vdc_init_dring_negotiate(vdc_t *vdc) 1818 { 1819 vio_dring_reg_msg_t pkt; 1820 size_t msglen = sizeof (pkt); 1821 int status = -1; 1822 int retry; 1823 int nretries = 10; 1824 1825 ASSERT(vdc != NULL); 1826 ASSERT(mutex_owned(&vdc->lock)); 1827 1828 for (retry = 0; retry < nretries; retry++) { 1829 status = vdc_init_descriptor_ring(vdc); 1830 if (status != EAGAIN) 1831 break; 1832 drv_usecwait(vdc_min_timeout_ldc); 1833 } 1834 1835 if (status != 0) { 1836 DMSG(vdc, 0, "[%d] Failed to init DRing (status = %d)\n", 1837 vdc->instance, status); 1838 return (status); 1839 } 1840 1841 DMSG(vdc, 0, "[%d] Init of descriptor ring completed (status = %d)\n", 1842 vdc->instance, status); 1843 1844 /* fill in tag */ 1845 pkt.tag.vio_msgtype = VIO_TYPE_CTRL; 1846 pkt.tag.vio_subtype = VIO_SUBTYPE_INFO; 1847 pkt.tag.vio_subtype_env = VIO_DRING_REG; 1848 pkt.tag.vio_sid = vdc->session_id; 1849 /* fill in payload */ 1850 pkt.dring_ident = 0; 1851 pkt.num_descriptors = vdc->dring_len; 1852 pkt.descriptor_size = vdc->dring_entry_size; 1853 pkt.options = (VIO_TX_DRING | VIO_RX_DRING); 1854 pkt.ncookies = vdc->dring_cookie_count; 1855 pkt.cookie[0] = vdc->dring_cookie[0]; /* for now just one cookie */ 1856 1857 status = vdc_send(vdc, (caddr_t)&pkt, &msglen); 1858 if (status != 0) { 1859 DMSG(vdc, 0, "[%d] Failed to register DRing (err = %d)", 1860 vdc->instance, status); 1861 } 1862 1863 return (status); 1864 } 1865 1866 1867 /* 1868 * Function: 1869 * vdc_dring_negotiation() 1870 * 1871 * Description: 1872 * 1873 * Arguments: 1874 * vdc - soft state pointer for this instance of the device driver. 1875 * 1876 * Return Code: 1877 * 0 - Success 1878 */ 1879 static int 1880 vdc_dring_negotiation(vdc_t *vdcp) 1881 { 1882 int status; 1883 vio_msg_t vio_msg; 1884 1885 if (status = vdc_init_dring_negotiate(vdcp)) 1886 return (status); 1887 1888 /* release lock and wait for response */ 1889 mutex_exit(&vdcp->lock); 1890 status = vdc_wait_for_response(vdcp, &vio_msg); 1891 mutex_enter(&vdcp->lock); 1892 if (status) { 1893 DMSG(vdcp, 0, 1894 "[%d] Failed waiting for Dring negotiation response," 1895 " rv(%d)", vdcp->instance, status); 1896 return (status); 1897 } 1898 1899 /* check type and sub_type ... */ 1900 if (vio_msg.tag.vio_msgtype != VIO_TYPE_CTRL || 1901 vio_msg.tag.vio_subtype == VIO_SUBTYPE_INFO) { 1902 DMSG(vdcp, 0, "[%d] Invalid Dring negotiation response\n", 1903 vdcp->instance); 1904 return (EPROTO); 1905 } 1906 1907 return (vdc_handle_dring_reg_msg(vdcp, 1908 (vio_dring_reg_msg_t *)&vio_msg)); 1909 } 1910 1911 1912 /* 1913 * Function: 1914 * vdc_send_rdx() 1915 * 1916 * Description: 1917 * 1918 * Arguments: 1919 * vdc - soft state pointer for this instance of the device driver. 1920 * 1921 * Return Code: 1922 * 0 - Success 1923 */ 1924 static int 1925 vdc_send_rdx(vdc_t *vdcp) 1926 { 1927 vio_msg_t msg; 1928 size_t msglen = sizeof (vio_msg_t); 1929 int status; 1930 1931 /* 1932 * Send an RDX message to vds to indicate we are ready 1933 * to send data 1934 */ 1935 msg.tag.vio_msgtype = VIO_TYPE_CTRL; 1936 msg.tag.vio_subtype = VIO_SUBTYPE_INFO; 1937 msg.tag.vio_subtype_env = VIO_RDX; 1938 msg.tag.vio_sid = vdcp->session_id; 1939 status = vdc_send(vdcp, (caddr_t)&msg, &msglen); 1940 if (status != 0) { 1941 DMSG(vdcp, 0, "[%d] Failed to send RDX message (%d)", 1942 vdcp->instance, status); 1943 } 1944 1945 return (status); 1946 } 1947 1948 /* 1949 * Function: 1950 * vdc_handle_rdx() 1951 * 1952 * Description: 1953 * 1954 * Arguments: 1955 * vdc - soft state pointer for this instance of the device driver. 1956 * msgp - received msg 1957 * 1958 * Return Code: 1959 * 0 - Success 1960 */ 1961 static int 1962 vdc_handle_rdx(vdc_t *vdcp, vio_rdx_msg_t *msgp) 1963 { 1964 _NOTE(ARGUNUSED(vdcp)) 1965 _NOTE(ARGUNUSED(msgp)) 1966 1967 ASSERT(msgp->tag.vio_msgtype == VIO_TYPE_CTRL); 1968 ASSERT(msgp->tag.vio_subtype == VIO_SUBTYPE_ACK); 1969 ASSERT(msgp->tag.vio_subtype_env == VIO_RDX); 1970 1971 DMSG(vdcp, 1, "[%d] Got an RDX msg", vdcp->instance); 1972 1973 return (0); 1974 } 1975 1976 /* 1977 * Function: 1978 * vdc_rdx_exchange() 1979 * 1980 * Description: 1981 * 1982 * Arguments: 1983 * vdc - soft state pointer for this instance of the device driver. 1984 * 1985 * Return Code: 1986 * 0 - Success 1987 */ 1988 static int 1989 vdc_rdx_exchange(vdc_t *vdcp) 1990 { 1991 int status; 1992 vio_msg_t vio_msg; 1993 1994 if (status = vdc_send_rdx(vdcp)) 1995 return (status); 1996 1997 /* release lock and wait for response */ 1998 mutex_exit(&vdcp->lock); 1999 status = vdc_wait_for_response(vdcp, &vio_msg); 2000 mutex_enter(&vdcp->lock); 2001 if (status) { 2002 DMSG(vdcp, 0, "[%d] Failed waiting for RDX response, rv(%d)", 2003 vdcp->instance, status); 2004 return (status); 2005 } 2006 2007 /* check type and sub_type ... */ 2008 if (vio_msg.tag.vio_msgtype != VIO_TYPE_CTRL || 2009 vio_msg.tag.vio_subtype != VIO_SUBTYPE_ACK) { 2010 DMSG(vdcp, 0, "[%d] Invalid RDX response\n", vdcp->instance); 2011 return (EPROTO); 2012 } 2013 2014 return (vdc_handle_rdx(vdcp, (vio_rdx_msg_t *)&vio_msg)); 2015 } 2016 2017 2018 /* -------------------------------------------------------------------------- */ 2019 2020 /* 2021 * LDC helper routines 2022 */ 2023 2024 static int 2025 vdc_recv(vdc_t *vdc, vio_msg_t *msgp, size_t *nbytesp) 2026 { 2027 int status; 2028 uint64_t delay_time; 2029 size_t len; 2030 2031 /* 2032 * Until we get a blocking ldc read we have to retry until the entire 2033 * LDC message has arrived before ldc_read() will return that message. 2034 * If ldc_read() succeed but returns a zero length message then that 2035 * means that the LDC queue is empty and we have to wait for a 2036 * notification from the LDC callback which will set the read_state to 2037 * VDC_READ_PENDING. Note we also bail out if the channel is reset or 2038 * goes away. 2039 */ 2040 delay_time = vdc_ldc_read_init_delay; 2041 2042 for (;;) { 2043 2044 len = *nbytesp; 2045 /* 2046 * vdc->curr_server is protected by vdc->lock but to avoid 2047 * contentions we don't take the lock here. We can do this 2048 * safely because vdc_recv() is only called from thread 2049 * process_msg_thread() which is also the only thread that 2050 * can change vdc->curr_server. 2051 */ 2052 status = ldc_read(vdc->curr_server->ldc_handle, 2053 (caddr_t)msgp, &len); 2054 2055 if (status == EAGAIN) { 2056 delay_time *= 2; 2057 if (delay_time >= vdc_ldc_read_max_delay) 2058 delay_time = vdc_ldc_read_max_delay; 2059 delay(delay_time); 2060 continue; 2061 } 2062 2063 if (status != 0) { 2064 DMSG(vdc, 0, "ldc_read returned %d\n", status); 2065 break; 2066 } 2067 2068 if (len != 0) { 2069 *nbytesp = len; 2070 break; 2071 } 2072 2073 mutex_enter(&vdc->read_lock); 2074 2075 while (vdc->read_state != VDC_READ_PENDING) { 2076 2077 /* detect if the connection has been reset */ 2078 if (vdc->read_state == VDC_READ_RESET) { 2079 mutex_exit(&vdc->read_lock); 2080 return (ECONNRESET); 2081 } 2082 2083 vdc->read_state = VDC_READ_WAITING; 2084 cv_wait(&vdc->read_cv, &vdc->read_lock); 2085 } 2086 2087 vdc->read_state = VDC_READ_IDLE; 2088 mutex_exit(&vdc->read_lock); 2089 2090 delay_time = vdc_ldc_read_init_delay; 2091 } 2092 2093 return (status); 2094 } 2095 2096 2097 2098 #ifdef DEBUG 2099 void 2100 vdc_decode_tag(vdc_t *vdcp, vio_msg_t *msg) 2101 { 2102 char *ms, *ss, *ses; 2103 switch (msg->tag.vio_msgtype) { 2104 #define Q(_s) case _s : ms = #_s; break; 2105 Q(VIO_TYPE_CTRL) 2106 Q(VIO_TYPE_DATA) 2107 Q(VIO_TYPE_ERR) 2108 #undef Q 2109 default: ms = "unknown"; break; 2110 } 2111 2112 switch (msg->tag.vio_subtype) { 2113 #define Q(_s) case _s : ss = #_s; break; 2114 Q(VIO_SUBTYPE_INFO) 2115 Q(VIO_SUBTYPE_ACK) 2116 Q(VIO_SUBTYPE_NACK) 2117 #undef Q 2118 default: ss = "unknown"; break; 2119 } 2120 2121 switch (msg->tag.vio_subtype_env) { 2122 #define Q(_s) case _s : ses = #_s; break; 2123 Q(VIO_VER_INFO) 2124 Q(VIO_ATTR_INFO) 2125 Q(VIO_DRING_REG) 2126 Q(VIO_DRING_UNREG) 2127 Q(VIO_RDX) 2128 Q(VIO_PKT_DATA) 2129 Q(VIO_DESC_DATA) 2130 Q(VIO_DRING_DATA) 2131 #undef Q 2132 default: ses = "unknown"; break; 2133 } 2134 2135 DMSG(vdcp, 3, "(%x/%x/%x) message : (%s/%s/%s)\n", 2136 msg->tag.vio_msgtype, msg->tag.vio_subtype, 2137 msg->tag.vio_subtype_env, ms, ss, ses); 2138 } 2139 #endif 2140 2141 /* 2142 * Function: 2143 * vdc_send() 2144 * 2145 * Description: 2146 * The function encapsulates the call to write a message using LDC. 2147 * If LDC indicates that the call failed due to the queue being full, 2148 * we retry the ldc_write(), otherwise we return the error returned by LDC. 2149 * 2150 * Arguments: 2151 * ldc_handle - LDC handle for the channel this instance of vdc uses 2152 * pkt - address of LDC message to be sent 2153 * msglen - the size of the message being sent. When the function 2154 * returns, this contains the number of bytes written. 2155 * 2156 * Return Code: 2157 * 0 - Success. 2158 * EINVAL - pkt or msglen were NULL 2159 * ECONNRESET - The connection was not up. 2160 * EWOULDBLOCK - LDC queue is full 2161 * xxx - other error codes returned by ldc_write 2162 */ 2163 static int 2164 vdc_send(vdc_t *vdc, caddr_t pkt, size_t *msglen) 2165 { 2166 size_t size = 0; 2167 int status = 0; 2168 clock_t delay_ticks; 2169 2170 ASSERT(vdc != NULL); 2171 ASSERT(mutex_owned(&vdc->lock)); 2172 ASSERT(msglen != NULL); 2173 ASSERT(*msglen != 0); 2174 2175 #ifdef DEBUG 2176 vdc_decode_tag(vdc, (vio_msg_t *)(uintptr_t)pkt); 2177 #endif 2178 /* 2179 * Wait indefinitely to send if channel 2180 * is busy, but bail out if we succeed or 2181 * if the channel closes or is reset. 2182 */ 2183 delay_ticks = vdc_hz_min_ldc_delay; 2184 do { 2185 size = *msglen; 2186 status = ldc_write(vdc->curr_server->ldc_handle, pkt, &size); 2187 if (status == EWOULDBLOCK) { 2188 delay(delay_ticks); 2189 /* geometric backoff */ 2190 delay_ticks *= 2; 2191 if (delay_ticks > vdc_hz_max_ldc_delay) 2192 delay_ticks = vdc_hz_max_ldc_delay; 2193 } 2194 } while (status == EWOULDBLOCK); 2195 2196 /* if LDC had serious issues --- reset vdc state */ 2197 if (status == EIO || status == ECONNRESET) { 2198 /* LDC had serious issues --- reset vdc state */ 2199 mutex_enter(&vdc->read_lock); 2200 if ((vdc->read_state == VDC_READ_WAITING) || 2201 (vdc->read_state == VDC_READ_RESET)) 2202 cv_signal(&vdc->read_cv); 2203 vdc->read_state = VDC_READ_RESET; 2204 mutex_exit(&vdc->read_lock); 2205 2206 /* wake up any waiters in the reset thread */ 2207 if (vdc->state == VDC_STATE_INIT_WAITING) { 2208 DMSG(vdc, 0, "[%d] write reset - " 2209 "vdc is resetting ..\n", vdc->instance); 2210 vdc->state = VDC_STATE_RESETTING; 2211 cv_signal(&vdc->initwait_cv); 2212 } 2213 2214 return (ECONNRESET); 2215 } 2216 2217 /* return the last size written */ 2218 *msglen = size; 2219 2220 return (status); 2221 } 2222 2223 /* 2224 * Function: 2225 * vdc_get_md_node 2226 * 2227 * Description: 2228 * Get the MD, the device node for the given disk instance. The 2229 * caller is responsible for cleaning up the reference to the 2230 * returned MD (mdpp) by calling md_fini_handle(). 2231 * 2232 * Arguments: 2233 * dip - dev info pointer for this instance of the device driver. 2234 * mdpp - the returned MD. 2235 * vd_nodep - the returned device node. 2236 * 2237 * Return Code: 2238 * 0 - Success. 2239 * ENOENT - Expected node or property did not exist. 2240 * ENXIO - Unexpected error communicating with MD framework 2241 */ 2242 static int 2243 vdc_get_md_node(dev_info_t *dip, md_t **mdpp, mde_cookie_t *vd_nodep) 2244 { 2245 int status = ENOENT; 2246 char *node_name = NULL; 2247 md_t *mdp = NULL; 2248 int num_nodes; 2249 int num_vdevs; 2250 mde_cookie_t rootnode; 2251 mde_cookie_t *listp = NULL; 2252 boolean_t found_inst = B_FALSE; 2253 int listsz; 2254 int idx; 2255 uint64_t md_inst; 2256 int obp_inst; 2257 int instance = ddi_get_instance(dip); 2258 2259 /* 2260 * Get the OBP instance number for comparison with the MD instance 2261 * 2262 * The "cfg-handle" property of a vdc node in an MD contains the MD's 2263 * notion of "instance", or unique identifier, for that node; OBP 2264 * stores the value of the "cfg-handle" MD property as the value of 2265 * the "reg" property on the node in the device tree it builds from 2266 * the MD and passes to Solaris. Thus, we look up the devinfo node's 2267 * "reg" property value to uniquely identify this device instance. 2268 * If the "reg" property cannot be found, the device tree state is 2269 * presumably so broken that there is no point in continuing. 2270 */ 2271 if (!ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS, OBP_REG)) { 2272 cmn_err(CE_WARN, "'%s' property does not exist", OBP_REG); 2273 return (ENOENT); 2274 } 2275 obp_inst = ddi_prop_get_int(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS, 2276 OBP_REG, -1); 2277 DMSGX(1, "[%d] OBP inst=%d\n", instance, obp_inst); 2278 2279 /* 2280 * We now walk the MD nodes to find the node for this vdisk. 2281 */ 2282 if ((mdp = md_get_handle()) == NULL) { 2283 cmn_err(CE_WARN, "unable to init machine description"); 2284 return (ENXIO); 2285 } 2286 2287 num_nodes = md_node_count(mdp); 2288 ASSERT(num_nodes > 0); 2289 2290 listsz = num_nodes * sizeof (mde_cookie_t); 2291 2292 /* allocate memory for nodes */ 2293 listp = kmem_zalloc(listsz, KM_SLEEP); 2294 2295 rootnode = md_root_node(mdp); 2296 ASSERT(rootnode != MDE_INVAL_ELEM_COOKIE); 2297 2298 /* 2299 * Search for all the virtual devices, we will then check to see which 2300 * ones are disk nodes. 2301 */ 2302 num_vdevs = md_scan_dag(mdp, rootnode, 2303 md_find_name(mdp, VDC_MD_VDEV_NAME), 2304 md_find_name(mdp, "fwd"), listp); 2305 2306 if (num_vdevs <= 0) { 2307 cmn_err(CE_NOTE, "No '%s' node found", VDC_MD_VDEV_NAME); 2308 status = ENOENT; 2309 goto done; 2310 } 2311 2312 DMSGX(1, "[%d] num_vdevs=%d\n", instance, num_vdevs); 2313 for (idx = 0; idx < num_vdevs; idx++) { 2314 status = md_get_prop_str(mdp, listp[idx], "name", &node_name); 2315 if ((status != 0) || (node_name == NULL)) { 2316 cmn_err(CE_NOTE, "Unable to get name of node type '%s'" 2317 ": err %d", VDC_MD_VDEV_NAME, status); 2318 continue; 2319 } 2320 2321 DMSGX(1, "[%d] Found node '%s'\n", instance, node_name); 2322 if (strcmp(VDC_MD_DISK_NAME, node_name) == 0) { 2323 status = md_get_prop_val(mdp, listp[idx], 2324 VDC_MD_CFG_HDL, &md_inst); 2325 DMSGX(1, "[%d] vdc inst in MD=%lx\n", 2326 instance, md_inst); 2327 if ((status == 0) && (md_inst == obp_inst)) { 2328 found_inst = B_TRUE; 2329 break; 2330 } 2331 } 2332 } 2333 2334 if (!found_inst) { 2335 DMSGX(0, "Unable to find correct '%s' node", VDC_MD_DISK_NAME); 2336 status = ENOENT; 2337 goto done; 2338 } 2339 DMSGX(0, "[%d] MD inst=%lx\n", instance, md_inst); 2340 2341 *vd_nodep = listp[idx]; 2342 *mdpp = mdp; 2343 done: 2344 kmem_free(listp, listsz); 2345 return (status); 2346 } 2347 2348 /* 2349 * Function: 2350 * vdc_init_ports 2351 * 2352 * Description: 2353 * Initialize all the ports for this vdisk instance. 2354 * 2355 * Arguments: 2356 * vdc - soft state pointer for this instance of the device driver. 2357 * mdp - md pointer 2358 * vd_nodep - device md node. 2359 * 2360 * Return Code: 2361 * 0 - Success. 2362 * ENOENT - Expected node or property did not exist. 2363 */ 2364 static int 2365 vdc_init_ports(vdc_t *vdc, md_t *mdp, mde_cookie_t vd_nodep) 2366 { 2367 int status = 0; 2368 int idx; 2369 int num_nodes; 2370 int num_vports; 2371 int num_chans; 2372 int listsz; 2373 mde_cookie_t vd_port; 2374 mde_cookie_t *chanp = NULL; 2375 mde_cookie_t *portp = NULL; 2376 vdc_server_t *srvr; 2377 vdc_server_t *prev_srvr = NULL; 2378 2379 /* 2380 * We now walk the MD nodes to find the port nodes for this vdisk. 2381 */ 2382 num_nodes = md_node_count(mdp); 2383 ASSERT(num_nodes > 0); 2384 2385 listsz = num_nodes * sizeof (mde_cookie_t); 2386 2387 /* allocate memory for nodes */ 2388 portp = kmem_zalloc(listsz, KM_SLEEP); 2389 chanp = kmem_zalloc(listsz, KM_SLEEP); 2390 2391 num_vports = md_scan_dag(mdp, vd_nodep, 2392 md_find_name(mdp, VDC_MD_PORT_NAME), 2393 md_find_name(mdp, "fwd"), portp); 2394 if (num_vports == 0) { 2395 DMSGX(0, "Found no '%s' node for '%s' port\n", 2396 VDC_MD_PORT_NAME, VDC_MD_VDEV_NAME); 2397 status = ENOENT; 2398 goto done; 2399 } 2400 2401 DMSGX(1, "Found %d '%s' node(s) for '%s' port\n", 2402 num_vports, VDC_MD_PORT_NAME, VDC_MD_VDEV_NAME); 2403 2404 vdc->num_servers = 0; 2405 for (idx = 0; idx < num_vports; idx++) { 2406 2407 /* initialize this port */ 2408 vd_port = portp[idx]; 2409 srvr = kmem_zalloc(sizeof (vdc_server_t), KM_SLEEP); 2410 srvr->vdcp = vdc; 2411 srvr->svc_state = VDC_SERVICE_OFFLINE; 2412 srvr->log_state = VDC_SERVICE_NONE; 2413 2414 /* get port id */ 2415 if (md_get_prop_val(mdp, vd_port, VDC_MD_ID, &srvr->id) != 0) { 2416 cmn_err(CE_NOTE, "vDisk port '%s' property not found", 2417 VDC_MD_ID); 2418 kmem_free(srvr, sizeof (vdc_server_t)); 2419 continue; 2420 } 2421 2422 /* set the connection timeout */ 2423 if (md_get_prop_val(mdp, vd_port, VDC_MD_TIMEOUT, 2424 &srvr->ctimeout) != 0) { 2425 srvr->ctimeout = 0; 2426 } 2427 2428 /* get the ldc id */ 2429 num_chans = md_scan_dag(mdp, vd_port, 2430 md_find_name(mdp, VDC_MD_CHAN_NAME), 2431 md_find_name(mdp, "fwd"), chanp); 2432 2433 /* expecting at least one channel */ 2434 if (num_chans <= 0) { 2435 cmn_err(CE_NOTE, "No '%s' node for '%s' port", 2436 VDC_MD_CHAN_NAME, VDC_MD_VDEV_NAME); 2437 kmem_free(srvr, sizeof (vdc_server_t)); 2438 continue; 2439 } else if (num_chans != 1) { 2440 DMSGX(0, "Expected 1 '%s' node for '%s' port, " 2441 "found %d\n", VDC_MD_CHAN_NAME, VDC_MD_VDEV_NAME, 2442 num_chans); 2443 } 2444 2445 /* 2446 * We use the first channel found (index 0), irrespective of how 2447 * many are there in total. 2448 */ 2449 if (md_get_prop_val(mdp, chanp[0], VDC_MD_ID, 2450 &srvr->ldc_id) != 0) { 2451 cmn_err(CE_NOTE, "Channel '%s' property not found", 2452 VDC_MD_ID); 2453 kmem_free(srvr, sizeof (vdc_server_t)); 2454 continue; 2455 } 2456 2457 /* 2458 * now initialise LDC channel which will be used to 2459 * communicate with this server 2460 */ 2461 if (vdc_do_ldc_init(vdc, srvr) != 0) { 2462 kmem_free(srvr, sizeof (vdc_server_t)); 2463 continue; 2464 } 2465 2466 /* add server to list */ 2467 if (prev_srvr) 2468 prev_srvr->next = srvr; 2469 else 2470 vdc->server_list = srvr; 2471 2472 prev_srvr = srvr; 2473 2474 /* inc numbers of servers */ 2475 vdc->num_servers++; 2476 } 2477 2478 /* pick first server as current server */ 2479 if (vdc->server_list != NULL) { 2480 vdc->curr_server = vdc->server_list; 2481 status = 0; 2482 } else { 2483 status = ENOENT; 2484 } 2485 2486 done: 2487 kmem_free(chanp, listsz); 2488 kmem_free(portp, listsz); 2489 return (status); 2490 } 2491 2492 2493 /* 2494 * Function: 2495 * vdc_do_ldc_up 2496 * 2497 * Description: 2498 * Bring the channel for the current server up. 2499 * 2500 * Arguments: 2501 * vdc - soft state pointer for this instance of the device driver. 2502 * 2503 * Return Code: 2504 * 0 - Success. 2505 * EINVAL - Driver is detaching / LDC error 2506 * ECONNREFUSED - Other end is not listening 2507 */ 2508 static int 2509 vdc_do_ldc_up(vdc_t *vdc) 2510 { 2511 int status; 2512 ldc_status_t ldc_state; 2513 2514 ASSERT(MUTEX_HELD(&vdc->lock)); 2515 2516 DMSG(vdc, 0, "[%d] Bringing up channel %lx\n", 2517 vdc->instance, vdc->curr_server->ldc_id); 2518 2519 if (vdc->lifecycle == VDC_LC_DETACHING) 2520 return (EINVAL); 2521 2522 if ((status = ldc_up(vdc->curr_server->ldc_handle)) != 0) { 2523 switch (status) { 2524 case ECONNREFUSED: /* listener not ready at other end */ 2525 DMSG(vdc, 0, "[%d] ldc_up(%lx,...) return %d\n", 2526 vdc->instance, vdc->curr_server->ldc_id, status); 2527 status = 0; 2528 break; 2529 default: 2530 DMSG(vdc, 0, "[%d] Failed to bring up LDC: " 2531 "channel=%ld, err=%d", vdc->instance, 2532 vdc->curr_server->ldc_id, status); 2533 break; 2534 } 2535 } 2536 2537 if (ldc_status(vdc->curr_server->ldc_handle, &ldc_state) == 0) { 2538 vdc->curr_server->ldc_state = ldc_state; 2539 if (ldc_state == LDC_UP) { 2540 DMSG(vdc, 0, "[%d] LDC channel already up\n", 2541 vdc->instance); 2542 vdc->seq_num = 1; 2543 vdc->seq_num_reply = 0; 2544 } 2545 } 2546 2547 return (status); 2548 } 2549 2550 /* 2551 * Function: 2552 * vdc_terminate_ldc() 2553 * 2554 * Description: 2555 * 2556 * Arguments: 2557 * vdc - soft state pointer for this instance of the device driver. 2558 * srvr - vdc per-server info structure 2559 * 2560 * Return Code: 2561 * None 2562 */ 2563 static void 2564 vdc_terminate_ldc(vdc_t *vdc, vdc_server_t *srvr) 2565 { 2566 int instance = ddi_get_instance(vdc->dip); 2567 2568 if (srvr->state & VDC_LDC_OPEN) { 2569 DMSG(vdc, 0, "[%d] ldc_close()\n", instance); 2570 (void) ldc_close(srvr->ldc_handle); 2571 } 2572 if (srvr->state & VDC_LDC_CB) { 2573 DMSG(vdc, 0, "[%d] ldc_unreg_callback()\n", instance); 2574 (void) ldc_unreg_callback(srvr->ldc_handle); 2575 } 2576 if (srvr->state & VDC_LDC_INIT) { 2577 DMSG(vdc, 0, "[%d] ldc_fini()\n", instance); 2578 (void) ldc_fini(srvr->ldc_handle); 2579 srvr->ldc_handle = NULL; 2580 } 2581 2582 srvr->state &= ~(VDC_LDC_INIT | VDC_LDC_CB | VDC_LDC_OPEN); 2583 } 2584 2585 /* 2586 * Function: 2587 * vdc_fini_ports() 2588 * 2589 * Description: 2590 * Finalize all ports by closing the channel associated with each 2591 * port and also freeing the server structure. 2592 * 2593 * Arguments: 2594 * vdc - soft state pointer for this instance of the device driver. 2595 * 2596 * Return Code: 2597 * None 2598 */ 2599 static void 2600 vdc_fini_ports(vdc_t *vdc) 2601 { 2602 int instance = ddi_get_instance(vdc->dip); 2603 vdc_server_t *srvr, *prev_srvr; 2604 2605 ASSERT(vdc != NULL); 2606 ASSERT(mutex_owned(&vdc->lock)); 2607 2608 DMSG(vdc, 0, "[%d] initialized=%x\n", instance, vdc->initialized); 2609 2610 srvr = vdc->server_list; 2611 2612 while (srvr) { 2613 2614 vdc_terminate_ldc(vdc, srvr); 2615 2616 /* next server */ 2617 prev_srvr = srvr; 2618 srvr = srvr->next; 2619 2620 /* free server */ 2621 kmem_free(prev_srvr, sizeof (vdc_server_t)); 2622 } 2623 2624 vdc->server_list = NULL; 2625 vdc->num_servers = 0; 2626 } 2627 2628 /* -------------------------------------------------------------------------- */ 2629 2630 /* 2631 * Descriptor Ring helper routines 2632 */ 2633 2634 /* 2635 * Function: 2636 * vdc_init_descriptor_ring() 2637 * 2638 * Description: 2639 * 2640 * Arguments: 2641 * vdc - soft state pointer for this instance of the device driver. 2642 * 2643 * Return Code: 2644 * 0 - Success 2645 */ 2646 static int 2647 vdc_init_descriptor_ring(vdc_t *vdc) 2648 { 2649 vd_dring_entry_t *dep = NULL; /* DRing Entry pointer */ 2650 int status = 0; 2651 int i; 2652 2653 DMSG(vdc, 0, "[%d] initialized=%x\n", vdc->instance, vdc->initialized); 2654 2655 ASSERT(vdc != NULL); 2656 ASSERT(mutex_owned(&vdc->lock)); 2657 2658 /* ensure we have enough room to store max sized block */ 2659 ASSERT(maxphys <= VD_MAX_BLOCK_SIZE); 2660 2661 if ((vdc->initialized & VDC_DRING_INIT) == 0) { 2662 DMSG(vdc, 0, "[%d] ldc_mem_dring_create\n", vdc->instance); 2663 /* 2664 * Calculate the maximum block size we can transmit using one 2665 * Descriptor Ring entry from the attributes returned by the 2666 * vDisk server. This is subject to a minimum of 'maxphys' 2667 * as we do not have the capability to split requests over 2668 * multiple DRing entries. 2669 */ 2670 if ((vdc->max_xfer_sz * vdc->vdisk_bsize) < maxphys) { 2671 DMSG(vdc, 0, "[%d] using minimum DRing size\n", 2672 vdc->instance); 2673 vdc->dring_max_cookies = maxphys / PAGESIZE; 2674 } else { 2675 vdc->dring_max_cookies = 2676 (vdc->max_xfer_sz * vdc->vdisk_bsize) / PAGESIZE; 2677 } 2678 vdc->dring_entry_size = (sizeof (vd_dring_entry_t) + 2679 (sizeof (ldc_mem_cookie_t) * 2680 (vdc->dring_max_cookies - 1))); 2681 vdc->dring_len = VD_DRING_LEN; 2682 2683 status = ldc_mem_dring_create(vdc->dring_len, 2684 vdc->dring_entry_size, &vdc->dring_hdl); 2685 if ((vdc->dring_hdl == NULL) || (status != 0)) { 2686 DMSG(vdc, 0, "[%d] Descriptor ring creation failed", 2687 vdc->instance); 2688 return (status); 2689 } 2690 vdc->initialized |= VDC_DRING_INIT; 2691 } 2692 2693 if ((vdc->initialized & VDC_DRING_BOUND) == 0) { 2694 DMSG(vdc, 0, "[%d] ldc_mem_dring_bind\n", vdc->instance); 2695 vdc->dring_cookie = 2696 kmem_zalloc(sizeof (ldc_mem_cookie_t), KM_SLEEP); 2697 2698 status = ldc_mem_dring_bind(vdc->curr_server->ldc_handle, 2699 vdc->dring_hdl, 2700 LDC_SHADOW_MAP|LDC_DIRECT_MAP, LDC_MEM_RW, 2701 &vdc->dring_cookie[0], 2702 &vdc->dring_cookie_count); 2703 if (status != 0) { 2704 DMSG(vdc, 0, "[%d] Failed to bind descriptor ring " 2705 "(%lx) to channel (%lx) status=%d\n", 2706 vdc->instance, vdc->dring_hdl, 2707 vdc->curr_server->ldc_handle, status); 2708 return (status); 2709 } 2710 ASSERT(vdc->dring_cookie_count == 1); 2711 vdc->initialized |= VDC_DRING_BOUND; 2712 } 2713 2714 status = ldc_mem_dring_info(vdc->dring_hdl, &vdc->dring_mem_info); 2715 if (status != 0) { 2716 DMSG(vdc, 0, 2717 "[%d] Failed to get info for descriptor ring (%lx)\n", 2718 vdc->instance, vdc->dring_hdl); 2719 return (status); 2720 } 2721 2722 if ((vdc->initialized & VDC_DRING_LOCAL) == 0) { 2723 DMSG(vdc, 0, "[%d] local dring\n", vdc->instance); 2724 2725 /* Allocate the local copy of this dring */ 2726 vdc->local_dring = 2727 kmem_zalloc(vdc->dring_len * sizeof (vdc_local_desc_t), 2728 KM_SLEEP); 2729 vdc->initialized |= VDC_DRING_LOCAL; 2730 } 2731 2732 /* 2733 * Mark all DRing entries as free and initialize the private 2734 * descriptor's memory handles. If any entry is initialized, 2735 * we need to free it later so we set the bit in 'initialized' 2736 * at the start. 2737 */ 2738 vdc->initialized |= VDC_DRING_ENTRY; 2739 for (i = 0; i < vdc->dring_len; i++) { 2740 dep = VDC_GET_DRING_ENTRY_PTR(vdc, i); 2741 dep->hdr.dstate = VIO_DESC_FREE; 2742 2743 status = ldc_mem_alloc_handle(vdc->curr_server->ldc_handle, 2744 &vdc->local_dring[i].desc_mhdl); 2745 if (status != 0) { 2746 DMSG(vdc, 0, "![%d] Failed to alloc mem handle for" 2747 " descriptor %d", vdc->instance, i); 2748 return (status); 2749 } 2750 vdc->local_dring[i].is_free = B_TRUE; 2751 vdc->local_dring[i].dep = dep; 2752 } 2753 2754 /* Initialize the starting index */ 2755 vdc->dring_curr_idx = VDC_DRING_FIRST_ENTRY; 2756 2757 return (status); 2758 } 2759 2760 /* 2761 * Function: 2762 * vdc_destroy_descriptor_ring() 2763 * 2764 * Description: 2765 * 2766 * Arguments: 2767 * vdc - soft state pointer for this instance of the device driver. 2768 * 2769 * Return Code: 2770 * None 2771 */ 2772 static void 2773 vdc_destroy_descriptor_ring(vdc_t *vdc) 2774 { 2775 vdc_local_desc_t *ldep = NULL; /* Local Dring Entry Pointer */ 2776 ldc_mem_handle_t mhdl = NULL; 2777 ldc_mem_info_t minfo; 2778 int status = -1; 2779 int i; /* loop */ 2780 2781 ASSERT(vdc != NULL); 2782 ASSERT(mutex_owned(&vdc->lock)); 2783 2784 DMSG(vdc, 0, "[%d] Entered\n", vdc->instance); 2785 2786 if (vdc->initialized & VDC_DRING_ENTRY) { 2787 DMSG(vdc, 0, 2788 "[%d] Removing Local DRing entries\n", vdc->instance); 2789 for (i = 0; i < vdc->dring_len; i++) { 2790 ldep = &vdc->local_dring[i]; 2791 mhdl = ldep->desc_mhdl; 2792 2793 if (mhdl == NULL) 2794 continue; 2795 2796 if ((status = ldc_mem_info(mhdl, &minfo)) != 0) { 2797 DMSG(vdc, 0, 2798 "ldc_mem_info returned an error: %d\n", 2799 status); 2800 2801 /* 2802 * This must mean that the mem handle 2803 * is not valid. Clear it out so that 2804 * no one tries to use it. 2805 */ 2806 ldep->desc_mhdl = NULL; 2807 continue; 2808 } 2809 2810 if (minfo.status == LDC_BOUND) { 2811 (void) ldc_mem_unbind_handle(mhdl); 2812 } 2813 2814 (void) ldc_mem_free_handle(mhdl); 2815 2816 ldep->desc_mhdl = NULL; 2817 } 2818 vdc->initialized &= ~VDC_DRING_ENTRY; 2819 } 2820 2821 if (vdc->initialized & VDC_DRING_LOCAL) { 2822 DMSG(vdc, 0, "[%d] Freeing Local DRing\n", vdc->instance); 2823 kmem_free(vdc->local_dring, 2824 vdc->dring_len * sizeof (vdc_local_desc_t)); 2825 vdc->initialized &= ~VDC_DRING_LOCAL; 2826 } 2827 2828 if (vdc->initialized & VDC_DRING_BOUND) { 2829 DMSG(vdc, 0, "[%d] Unbinding DRing\n", vdc->instance); 2830 status = ldc_mem_dring_unbind(vdc->dring_hdl); 2831 if (status == 0) { 2832 vdc->initialized &= ~VDC_DRING_BOUND; 2833 } else { 2834 DMSG(vdc, 0, "[%d] Error %d unbinding DRing %lx", 2835 vdc->instance, status, vdc->dring_hdl); 2836 } 2837 kmem_free(vdc->dring_cookie, sizeof (ldc_mem_cookie_t)); 2838 } 2839 2840 if (vdc->initialized & VDC_DRING_INIT) { 2841 DMSG(vdc, 0, "[%d] Destroying DRing\n", vdc->instance); 2842 status = ldc_mem_dring_destroy(vdc->dring_hdl); 2843 if (status == 0) { 2844 vdc->dring_hdl = NULL; 2845 bzero(&vdc->dring_mem_info, sizeof (ldc_mem_info_t)); 2846 vdc->initialized &= ~VDC_DRING_INIT; 2847 } else { 2848 DMSG(vdc, 0, "[%d] Error %d destroying DRing (%lx)", 2849 vdc->instance, status, vdc->dring_hdl); 2850 } 2851 } 2852 } 2853 2854 /* 2855 * Function: 2856 * vdc_map_to_shared_dring() 2857 * 2858 * Description: 2859 * Copy contents of the local descriptor to the shared 2860 * memory descriptor. 2861 * 2862 * Arguments: 2863 * vdcp - soft state pointer for this instance of the device driver. 2864 * idx - descriptor ring index 2865 * 2866 * Return Code: 2867 * None 2868 */ 2869 static int 2870 vdc_map_to_shared_dring(vdc_t *vdcp, int idx) 2871 { 2872 vdc_local_desc_t *ldep; 2873 vd_dring_entry_t *dep; 2874 int rv; 2875 2876 ldep = &(vdcp->local_dring[idx]); 2877 2878 /* for now leave in the old pop_mem_hdl stuff */ 2879 if (ldep->nbytes > 0) { 2880 rv = vdc_populate_mem_hdl(vdcp, ldep); 2881 if (rv) { 2882 DMSG(vdcp, 0, "[%d] Cannot populate mem handle\n", 2883 vdcp->instance); 2884 return (rv); 2885 } 2886 } 2887 2888 /* 2889 * fill in the data details into the DRing 2890 */ 2891 dep = ldep->dep; 2892 ASSERT(dep != NULL); 2893 2894 dep->payload.req_id = VDC_GET_NEXT_REQ_ID(vdcp); 2895 dep->payload.operation = ldep->operation; 2896 dep->payload.addr = ldep->offset; 2897 dep->payload.nbytes = ldep->nbytes; 2898 dep->payload.status = (uint32_t)-1; /* vds will set valid value */ 2899 dep->payload.slice = ldep->slice; 2900 dep->hdr.dstate = VIO_DESC_READY; 2901 dep->hdr.ack = 1; /* request an ACK for every message */ 2902 2903 return (0); 2904 } 2905 2906 /* 2907 * Function: 2908 * vdc_send_request 2909 * 2910 * Description: 2911 * This routine writes the data to be transmitted to vds into the 2912 * descriptor, notifies vds that the ring has been updated and 2913 * then waits for the request to be processed. 2914 * 2915 * Arguments: 2916 * vdcp - the soft state pointer 2917 * operation - operation we want vds to perform (VD_OP_XXX) 2918 * addr - address of data buf to be read/written. 2919 * nbytes - number of bytes to read/write 2920 * slice - the disk slice this request is for 2921 * offset - relative disk offset 2922 * bufp - buf of operation 2923 * dir - direction of operation (READ/WRITE/BOTH) 2924 * 2925 * Return Codes: 2926 * 0 2927 * ENXIO 2928 */ 2929 static int 2930 vdc_send_request(vdc_t *vdcp, int operation, caddr_t addr, 2931 size_t nbytes, int slice, diskaddr_t offset, buf_t *bufp, 2932 vio_desc_direction_t dir, int flags) 2933 { 2934 int rv = 0; 2935 2936 ASSERT(vdcp != NULL); 2937 ASSERT(slice == VD_SLICE_NONE || slice < V_NUMPAR); 2938 2939 mutex_enter(&vdcp->lock); 2940 2941 /* 2942 * If this is a block read/write operation we update the I/O statistics 2943 * to indicate that the request is being put on the waitq to be 2944 * serviced. Operations which are resubmitted are already in the waitq. 2945 * 2946 * We do it here (a common routine for both synchronous and strategy 2947 * calls) for performance reasons - we are already holding vdc->lock 2948 * so there is no extra locking overhead. We would have to explicitly 2949 * grab the 'lock' mutex to update the stats if we were to do this 2950 * higher up the stack in vdc_strategy() et. al. 2951 */ 2952 if (((operation == VD_OP_BREAD) || (operation == VD_OP_BWRITE)) && 2953 !(flags & VDC_OP_RESUBMIT)) { 2954 DTRACE_IO1(start, buf_t *, bufp); 2955 VD_KSTAT_WAITQ_ENTER(vdcp); 2956 } 2957 2958 /* 2959 * If the request does not expect the state to be VDC_STATE_RUNNING 2960 * then we just try to populate the descriptor ring once. 2961 */ 2962 if (!(flags & VDC_OP_STATE_RUNNING)) { 2963 rv = vdc_populate_descriptor(vdcp, operation, addr, 2964 nbytes, slice, offset, bufp, dir, flags); 2965 goto done; 2966 } 2967 2968 do { 2969 while (vdcp->state != VDC_STATE_RUNNING) { 2970 2971 /* return error if detaching */ 2972 if (vdcp->state == VDC_STATE_DETACH) { 2973 rv = ENXIO; 2974 goto done; 2975 } 2976 2977 /* 2978 * If we are panicking and the disk is not ready then 2979 * we can't send any request because we can't complete 2980 * the handshake now. 2981 */ 2982 if (ddi_in_panic()) { 2983 rv = EIO; 2984 goto done; 2985 } 2986 2987 /* 2988 * If the state is faulted, notify that a new I/O is 2989 * being submitted to force the system to check if any 2990 * server has recovered. 2991 */ 2992 if (vdcp->state == VDC_STATE_FAILED) { 2993 vdcp->io_pending = B_TRUE; 2994 cv_signal(&vdcp->io_pending_cv); 2995 } 2996 2997 cv_wait(&vdcp->running_cv, &vdcp->lock); 2998 2999 /* if service is still faulted then fail the request */ 3000 if (vdcp->state == VDC_STATE_FAILED) { 3001 rv = EIO; 3002 goto done; 3003 } 3004 } 3005 3006 } while (vdc_populate_descriptor(vdcp, operation, addr, 3007 nbytes, slice, offset, bufp, dir, flags & ~VDC_OP_RESUBMIT)); 3008 3009 done: 3010 /* 3011 * If this is a block read/write we update the I/O statistics kstat 3012 * to indicate that this request has been placed on the queue for 3013 * processing (i.e sent to the vDisk server) - iostat(1M) will 3014 * report the time waiting for the vDisk server under the %b column 3015 * 3016 * In the case of an error we take it off the wait queue only if 3017 * the I/O was not resubmited. 3018 */ 3019 if ((operation == VD_OP_BREAD) || (operation == VD_OP_BWRITE)) { 3020 if (rv == 0) { 3021 VD_KSTAT_WAITQ_TO_RUNQ(vdcp); 3022 DTRACE_PROBE1(send, buf_t *, bufp); 3023 } else { 3024 VD_UPDATE_ERR_STATS(vdcp, vd_transerrs); 3025 if (!(flags & VDC_OP_RESUBMIT)) { 3026 VD_KSTAT_WAITQ_EXIT(vdcp); 3027 DTRACE_IO1(done, buf_t *, bufp); 3028 } 3029 } 3030 } 3031 3032 mutex_exit(&vdcp->lock); 3033 3034 return (rv); 3035 } 3036 3037 3038 /* 3039 * Function: 3040 * vdc_populate_descriptor 3041 * 3042 * Description: 3043 * This routine writes the data to be transmitted to vds into the 3044 * descriptor, notifies vds that the ring has been updated and 3045 * then waits for the request to be processed. 3046 * 3047 * Arguments: 3048 * vdcp - the soft state pointer 3049 * operation - operation we want vds to perform (VD_OP_XXX) 3050 * addr - address of data buf to be read/written. 3051 * nbytes - number of bytes to read/write 3052 * slice - the disk slice this request is for 3053 * offset - relative disk offset 3054 * bufp - buf of operation 3055 * dir - direction of operation (READ/WRITE/BOTH) 3056 * 3057 * Return Codes: 3058 * 0 3059 * EAGAIN 3060 * ECONNRESET 3061 * ENXIO 3062 */ 3063 static int 3064 vdc_populate_descriptor(vdc_t *vdcp, int operation, caddr_t addr, 3065 size_t nbytes, int slice, diskaddr_t offset, 3066 buf_t *bufp, vio_desc_direction_t dir, int flags) 3067 { 3068 vdc_local_desc_t *local_dep = NULL; /* Local Dring Pointer */ 3069 int idx; /* Index of DRing entry used */ 3070 int next_idx; 3071 vio_dring_msg_t dmsg; 3072 size_t msglen; 3073 int rv; 3074 3075 ASSERT(MUTEX_HELD(&vdcp->lock)); 3076 vdcp->threads_pending++; 3077 loop: 3078 DMSG(vdcp, 2, ": dring_curr_idx = %d\n", vdcp->dring_curr_idx); 3079 3080 if (flags & VDC_OP_DRING_RESERVED) { 3081 /* use D-Ring reserved entry */ 3082 idx = VDC_DRING_FIRST_RESV; 3083 local_dep = &(vdcp->local_dring[idx]); 3084 } else { 3085 /* Get next available D-Ring entry */ 3086 idx = vdcp->dring_curr_idx; 3087 local_dep = &(vdcp->local_dring[idx]); 3088 3089 if (!local_dep->is_free) { 3090 DMSG(vdcp, 2, "[%d]: dring full - waiting for space\n", 3091 vdcp->instance); 3092 cv_wait(&vdcp->dring_free_cv, &vdcp->lock); 3093 if (vdcp->state == VDC_STATE_RUNNING || 3094 vdcp->state == VDC_STATE_HANDLE_PENDING) { 3095 goto loop; 3096 } 3097 vdcp->threads_pending--; 3098 return (ECONNRESET); 3099 } 3100 3101 next_idx = idx + 1; 3102 if (next_idx >= vdcp->dring_len) 3103 next_idx = VDC_DRING_FIRST_ENTRY; 3104 vdcp->dring_curr_idx = next_idx; 3105 } 3106 3107 ASSERT(local_dep->is_free); 3108 3109 local_dep->operation = operation; 3110 local_dep->addr = addr; 3111 local_dep->nbytes = nbytes; 3112 local_dep->slice = slice; 3113 local_dep->offset = offset; 3114 local_dep->buf = bufp; 3115 local_dep->dir = dir; 3116 local_dep->flags = flags; 3117 3118 local_dep->is_free = B_FALSE; 3119 3120 rv = vdc_map_to_shared_dring(vdcp, idx); 3121 if (rv) { 3122 if (flags & VDC_OP_DRING_RESERVED) { 3123 DMSG(vdcp, 0, "[%d]: cannot bind memory - error\n", 3124 vdcp->instance); 3125 /* 3126 * We can't wait if we are using reserved slot. 3127 * Free the descriptor and return. 3128 */ 3129 local_dep->is_free = B_TRUE; 3130 vdcp->threads_pending--; 3131 return (rv); 3132 } 3133 DMSG(vdcp, 0, "[%d]: cannot bind memory - waiting ..\n", 3134 vdcp->instance); 3135 /* free the descriptor */ 3136 local_dep->is_free = B_TRUE; 3137 vdcp->dring_curr_idx = idx; 3138 cv_wait(&vdcp->membind_cv, &vdcp->lock); 3139 if (vdcp->state == VDC_STATE_RUNNING || 3140 vdcp->state == VDC_STATE_HANDLE_PENDING) { 3141 goto loop; 3142 } 3143 vdcp->threads_pending--; 3144 return (ECONNRESET); 3145 } 3146 3147 /* 3148 * Send a msg with the DRing details to vds 3149 */ 3150 VIO_INIT_DRING_DATA_TAG(dmsg); 3151 VDC_INIT_DRING_DATA_MSG_IDS(dmsg, vdcp); 3152 dmsg.dring_ident = vdcp->dring_ident; 3153 dmsg.start_idx = idx; 3154 dmsg.end_idx = idx; 3155 vdcp->seq_num++; 3156 3157 DTRACE_PROBE2(populate, int, vdcp->instance, 3158 vdc_local_desc_t *, local_dep); 3159 DMSG(vdcp, 2, "ident=0x%lx, st=%u, end=%u, seq=%ld\n", 3160 vdcp->dring_ident, dmsg.start_idx, dmsg.end_idx, dmsg.seq_num); 3161 3162 /* 3163 * note we're still holding the lock here to 3164 * make sure the message goes out in order !!!... 3165 */ 3166 msglen = sizeof (dmsg); 3167 rv = vdc_send(vdcp, (caddr_t)&dmsg, &msglen); 3168 switch (rv) { 3169 case ECONNRESET: 3170 /* 3171 * vdc_send initiates the reset on failure. 3172 * Since the transaction has already been put 3173 * on the local dring, it will automatically get 3174 * retried when the channel is reset. Given that, 3175 * it is ok to just return success even though the 3176 * send failed. 3177 */ 3178 rv = 0; 3179 break; 3180 3181 case 0: /* EOK */ 3182 DMSG(vdcp, 1, "sent via LDC: rv=%d\n", rv); 3183 break; 3184 3185 default: 3186 DMSG(vdcp, 0, "unexpected error, rv=%d\n", rv); 3187 rv = ENXIO; 3188 break; 3189 } 3190 3191 vdcp->threads_pending--; 3192 return (rv); 3193 } 3194 3195 /* 3196 * Function: 3197 * vdc_do_op 3198 * 3199 * Description: 3200 * Wrapper around vdc_submit_request(). Each request is associated with a 3201 * buf structure. If a buf structure is provided (bufp != NULL) then the 3202 * request will be submitted with that buf, and the caller can wait for 3203 * completion of the request with biowait(). If a buf structure is not 3204 * provided (bufp == NULL) then a buf structure is created and the function 3205 * waits for the completion of the request. 3206 * 3207 * If the flag VD_OP_STATE_RUNNING is set then vdc_submit_request() will 3208 * submit the request only when the vdisk is in state VD_STATE_RUNNING. 3209 * If the vdisk is not in that state then the vdc_submit_request() will 3210 * wait for that state to be reached. After the request is submitted, the 3211 * reply will be processed asynchronously by the vdc_process_msg_thread() 3212 * thread. 3213 * 3214 * If the flag VD_OP_STATE_RUNNING is not set then vdc_submit_request() 3215 * submit the request whatever the state of the vdisk is. Then vdc_do_op() 3216 * will wait for a reply message, process the reply and complete the 3217 * request. 3218 * 3219 * Arguments: 3220 * vdc - the soft state pointer 3221 * op - operation we want vds to perform (VD_OP_XXX) 3222 * addr - address of data buf to be read/written. 3223 * nbytes - number of bytes to read/write 3224 * slice - the disk slice this request is for 3225 * offset - relative disk offset 3226 * bufp - buf structure associated with the request (can be NULL). 3227 * dir - direction of operation (READ/WRITE/BOTH) 3228 * flags - flags for the request. 3229 * 3230 * Return Codes: 3231 * 0 - the request has been succesfully submitted and completed. 3232 * != 0 - the request has failed. In that case, if a buf structure 3233 * was provided (bufp != NULL) then the B_ERROR flag is set 3234 * and the b_error field of the buf structure is set to EIO. 3235 */ 3236 static int 3237 vdc_do_op(vdc_t *vdc, int op, caddr_t addr, size_t nbytes, int slice, 3238 diskaddr_t offset, struct buf *bufp, vio_desc_direction_t dir, int flags) 3239 { 3240 vio_msg_t vio_msg; 3241 struct buf buf; 3242 int rv; 3243 3244 if (bufp == NULL) { 3245 /* 3246 * We use buf just as a convenient way to get a notification 3247 * that the request is completed, so we initialize buf to the 3248 * minimum we need. 3249 */ 3250 bioinit(&buf); 3251 buf.b_bcount = nbytes; 3252 buf.b_flags = B_BUSY; 3253 bufp = &buf; 3254 } 3255 3256 rv = vdc_send_request(vdc, op, addr, nbytes, slice, offset, bufp, 3257 dir, flags); 3258 3259 if (rv != 0) 3260 goto done; 3261 3262 /* 3263 * If the request should be done in VDC_STATE_RUNNING state then the 3264 * reply will be received and processed by vdc_process_msg_thread() 3265 * and we just have to handle the panic case. Otherwise we have to 3266 * wait for the reply message and process it. 3267 */ 3268 if (flags & VDC_OP_STATE_RUNNING) { 3269 3270 if (ddi_in_panic()) { 3271 rv = vdc_drain_response(vdc, bufp); 3272 goto done; 3273 } 3274 3275 } else { 3276 /* wait for the response message */ 3277 rv = vdc_wait_for_response(vdc, &vio_msg); 3278 3279 if (rv == 0) 3280 rv = vdc_process_data_msg(vdc, &vio_msg); 3281 3282 if (rv) { 3283 /* 3284 * If this is a block read/write we update the I/O 3285 * statistics kstat to take it off the run queue. 3286 * If it is a resubmit then it needs to stay in 3287 * in the waitq, and it will be removed when the 3288 * I/O is eventually completed or cancelled. 3289 */ 3290 mutex_enter(&vdc->lock); 3291 if (op == VD_OP_BREAD || op == VD_OP_BWRITE) { 3292 if (flags & VDC_OP_RESUBMIT) { 3293 VD_KSTAT_RUNQ_BACK_TO_WAITQ(vdc); 3294 } else { 3295 VD_KSTAT_RUNQ_EXIT(vdc); 3296 DTRACE_IO1(done, buf_t *, bufp); 3297 } 3298 } 3299 mutex_exit(&vdc->lock); 3300 goto done; 3301 } 3302 3303 } 3304 3305 if (bufp == &buf) 3306 rv = biowait(bufp); 3307 3308 done: 3309 if (bufp == &buf) { 3310 biofini(bufp); 3311 } else if (rv != 0) { 3312 bioerror(bufp, EIO); 3313 biodone(bufp); 3314 } 3315 3316 return (rv); 3317 } 3318 3319 /* 3320 * Function: 3321 * vdc_do_sync_op 3322 * 3323 * Description: 3324 * Wrapper around vdc_do_op that serializes requests. 3325 * 3326 * Arguments: 3327 * vdcp - the soft state pointer 3328 * operation - operation we want vds to perform (VD_OP_XXX) 3329 * addr - address of data buf to be read/written. 3330 * nbytes - number of bytes to read/write 3331 * slice - the disk slice this request is for 3332 * offset - relative disk offset 3333 * dir - direction of operation (READ/WRITE/BOTH) 3334 * rconflict - check for reservation conflict in case of failure 3335 * 3336 * rconflict should be set to B_TRUE by most callers. Callers invoking the 3337 * VD_OP_SCSICMD operation can set rconflict to B_FALSE if they check the 3338 * result of a successful operation with vdc_scsi_status(). 3339 * 3340 * Return Codes: 3341 * 0 3342 * EAGAIN 3343 * EFAULT 3344 * ENXIO 3345 * EIO 3346 */ 3347 static int 3348 vdc_do_sync_op(vdc_t *vdcp, int operation, caddr_t addr, size_t nbytes, 3349 int slice, diskaddr_t offset, vio_desc_direction_t dir, boolean_t rconflict) 3350 { 3351 int status; 3352 int flags = VDC_OP_NORMAL; 3353 3354 /* 3355 * Grab the lock, if blocked wait until the server 3356 * response causes us to wake up again. 3357 */ 3358 mutex_enter(&vdcp->lock); 3359 vdcp->sync_op_cnt++; 3360 while (vdcp->sync_op_blocked && vdcp->state != VDC_STATE_DETACH) { 3361 if (ddi_in_panic()) { 3362 /* don't block if we are panicking */ 3363 vdcp->sync_op_cnt--; 3364 mutex_exit(&vdcp->lock); 3365 return (EIO); 3366 } else { 3367 cv_wait(&vdcp->sync_blocked_cv, &vdcp->lock); 3368 } 3369 } 3370 3371 if (vdcp->state == VDC_STATE_DETACH) { 3372 cv_broadcast(&vdcp->sync_blocked_cv); 3373 vdcp->sync_op_cnt--; 3374 mutex_exit(&vdcp->lock); 3375 return (ENXIO); 3376 } 3377 3378 /* now block anyone other thread entering after us */ 3379 vdcp->sync_op_blocked = B_TRUE; 3380 3381 mutex_exit(&vdcp->lock); 3382 3383 if (!rconflict) 3384 flags &= ~VDC_OP_ERRCHK_CONFLICT; 3385 3386 status = vdc_do_op(vdcp, operation, addr, nbytes, slice, offset, 3387 NULL, dir, flags); 3388 3389 mutex_enter(&vdcp->lock); 3390 3391 DMSG(vdcp, 2, ": operation returned %d\n", status); 3392 3393 if (vdcp->state == VDC_STATE_DETACH) { 3394 status = ENXIO; 3395 } 3396 3397 vdcp->sync_op_blocked = B_FALSE; 3398 vdcp->sync_op_cnt--; 3399 3400 /* signal the next waiting thread */ 3401 cv_signal(&vdcp->sync_blocked_cv); 3402 3403 mutex_exit(&vdcp->lock); 3404 3405 return (status); 3406 } 3407 3408 3409 /* 3410 * Function: 3411 * vdc_drain_response() 3412 * 3413 * Description: 3414 * When a guest is panicking, the completion of requests needs to be 3415 * handled differently because interrupts are disabled and vdc 3416 * will not get messages. We have to poll for the messages instead. 3417 * 3418 * Note: since we are panicking we don't implement the io:::done 3419 * DTrace probe or update the I/O statistics kstats. 3420 * 3421 * Arguments: 3422 * vdc - soft state pointer for this instance of the device driver. 3423 * buf - if buf is NULL then we drain all responses, otherwise we 3424 * poll until we receive a ACK/NACK for the specific I/O 3425 * described by buf. 3426 * 3427 * Return Code: 3428 * 0 - Success. If we were expecting a response to a particular 3429 * request then this means that a response has been received. 3430 */ 3431 static int 3432 vdc_drain_response(vdc_t *vdc, struct buf *buf) 3433 { 3434 int rv, idx, retries; 3435 size_t msglen; 3436 vdc_local_desc_t *ldep = NULL; /* Local Dring Entry Pointer */ 3437 vio_dring_msg_t dmsg; 3438 struct buf *mbuf; 3439 boolean_t ack; 3440 3441 mutex_enter(&vdc->lock); 3442 3443 retries = 0; 3444 for (;;) { 3445 msglen = sizeof (dmsg); 3446 rv = ldc_read(vdc->curr_server->ldc_handle, (caddr_t)&dmsg, 3447 &msglen); 3448 if (rv) { 3449 rv = EINVAL; 3450 break; 3451 } 3452 3453 /* 3454 * if there are no packets wait and check again 3455 */ 3456 if ((rv == 0) && (msglen == 0)) { 3457 if (retries++ > vdc_dump_retries) { 3458 rv = EAGAIN; 3459 break; 3460 } 3461 3462 drv_usecwait(vdc_usec_timeout_dump); 3463 continue; 3464 } 3465 3466 /* 3467 * Ignore all messages that are not ACKs/NACKs to 3468 * DRing requests. 3469 */ 3470 if ((dmsg.tag.vio_msgtype != VIO_TYPE_DATA) || 3471 (dmsg.tag.vio_subtype_env != VIO_DRING_DATA)) { 3472 DMSG(vdc, 0, "discard pkt: type=%d sub=%d env=%d\n", 3473 dmsg.tag.vio_msgtype, 3474 dmsg.tag.vio_subtype, 3475 dmsg.tag.vio_subtype_env); 3476 continue; 3477 } 3478 3479 /* 3480 * Record if the packet was ACK'ed or not. If the packet was not 3481 * ACK'ed then we will just mark the request as failed; we don't 3482 * want to reset the connection at this point. 3483 */ 3484 switch (dmsg.tag.vio_subtype) { 3485 case VIO_SUBTYPE_ACK: 3486 ack = B_TRUE; 3487 break; 3488 case VIO_SUBTYPE_NACK: 3489 ack = B_FALSE; 3490 break; 3491 default: 3492 continue; 3493 } 3494 3495 idx = dmsg.start_idx; 3496 if (idx >= vdc->dring_len) { 3497 DMSG(vdc, 0, "[%d] Bogus ack data : start %d\n", 3498 vdc->instance, idx); 3499 continue; 3500 } 3501 ldep = &vdc->local_dring[idx]; 3502 if (ldep->dep->hdr.dstate != VIO_DESC_DONE) { 3503 DMSG(vdc, 0, "[%d] Entry @ %d - state !DONE %d\n", 3504 vdc->instance, idx, ldep->dep->hdr.dstate); 3505 continue; 3506 } 3507 3508 mbuf = ldep->buf; 3509 ASSERT(mbuf != NULL); 3510 mbuf->b_resid = mbuf->b_bcount - ldep->dep->payload.nbytes; 3511 bioerror(mbuf, ack ? ldep->dep->payload.status : EIO); 3512 biodone(mbuf); 3513 3514 rv = vdc_depopulate_descriptor(vdc, idx); 3515 if (buf != NULL && buf == mbuf) { 3516 rv = 0; 3517 goto done; 3518 } 3519 3520 /* if this is the last descriptor - break out of loop */ 3521 if ((idx + 1) % vdc->dring_len == vdc->dring_curr_idx) { 3522 /* 3523 * If we were expecting a response for a particular 3524 * request then we return with an error otherwise we 3525 * have successfully completed the drain. 3526 */ 3527 rv = (buf != NULL)? ESRCH: 0; 3528 break; 3529 } 3530 } 3531 3532 done: 3533 mutex_exit(&vdc->lock); 3534 DMSG(vdc, 0, "End idx=%d\n", idx); 3535 3536 return (rv); 3537 } 3538 3539 3540 /* 3541 * Function: 3542 * vdc_depopulate_descriptor() 3543 * 3544 * Description: 3545 * 3546 * Arguments: 3547 * vdc - soft state pointer for this instance of the device driver. 3548 * idx - Index of the Descriptor Ring entry being modified 3549 * 3550 * Return Code: 3551 * 0 - Success 3552 */ 3553 static int 3554 vdc_depopulate_descriptor(vdc_t *vdc, uint_t idx) 3555 { 3556 vd_dring_entry_t *dep = NULL; /* Dring Entry Pointer */ 3557 vdc_local_desc_t *ldep = NULL; /* Local Dring Entry Pointer */ 3558 int status = ENXIO; 3559 int rv = 0; 3560 3561 ASSERT(vdc != NULL); 3562 ASSERT(idx < vdc->dring_len); 3563 ldep = &vdc->local_dring[idx]; 3564 ASSERT(ldep != NULL); 3565 ASSERT(MUTEX_HELD(&vdc->lock)); 3566 3567 DTRACE_PROBE2(depopulate, int, vdc->instance, vdc_local_desc_t *, ldep); 3568 DMSG(vdc, 2, ": idx = %d\n", idx); 3569 3570 dep = ldep->dep; 3571 ASSERT(dep != NULL); 3572 ASSERT((dep->hdr.dstate == VIO_DESC_DONE) || 3573 (dep->payload.status == ECANCELED)); 3574 3575 VDC_MARK_DRING_ENTRY_FREE(vdc, idx); 3576 3577 ldep->is_free = B_TRUE; 3578 status = dep->payload.status; 3579 DMSG(vdc, 2, ": is_free = %d : status = %d\n", ldep->is_free, status); 3580 3581 /* 3582 * If no buffers were used to transfer information to the server when 3583 * populating the descriptor then no memory handles need to be unbound 3584 * and we can return now. 3585 */ 3586 if (ldep->nbytes == 0) { 3587 cv_signal(&vdc->dring_free_cv); 3588 return (status); 3589 } 3590 3591 /* 3592 * If the upper layer passed in a misaligned address we copied the 3593 * data into an aligned buffer before sending it to LDC - we now 3594 * copy it back to the original buffer. 3595 */ 3596 if (ldep->align_addr) { 3597 ASSERT(ldep->addr != NULL); 3598 3599 if (dep->payload.nbytes > 0) 3600 bcopy(ldep->align_addr, ldep->addr, 3601 dep->payload.nbytes); 3602 kmem_free(ldep->align_addr, 3603 sizeof (caddr_t) * P2ROUNDUP(ldep->nbytes, 8)); 3604 ldep->align_addr = NULL; 3605 } 3606 3607 rv = ldc_mem_unbind_handle(ldep->desc_mhdl); 3608 if (rv != 0) { 3609 DMSG(vdc, 0, "?[%d] unbind mhdl 0x%lx @ idx %d failed (%d)", 3610 vdc->instance, ldep->desc_mhdl, idx, rv); 3611 /* 3612 * The error returned by the vDisk server is more informative 3613 * and thus has a higher priority but if it isn't set we ensure 3614 * that this function returns an error. 3615 */ 3616 if (status == 0) 3617 status = EINVAL; 3618 } 3619 3620 cv_signal(&vdc->membind_cv); 3621 cv_signal(&vdc->dring_free_cv); 3622 3623 return (status); 3624 } 3625 3626 /* 3627 * Function: 3628 * vdc_populate_mem_hdl() 3629 * 3630 * Description: 3631 * 3632 * Arguments: 3633 * vdc - soft state pointer for this instance of the device driver. 3634 * idx - Index of the Descriptor Ring entry being modified 3635 * addr - virtual address being mapped in 3636 * nybtes - number of bytes in 'addr' 3637 * operation - the vDisk operation being performed (VD_OP_xxx) 3638 * 3639 * Return Code: 3640 * 0 - Success 3641 */ 3642 static int 3643 vdc_populate_mem_hdl(vdc_t *vdcp, vdc_local_desc_t *ldep) 3644 { 3645 vd_dring_entry_t *dep = NULL; 3646 ldc_mem_handle_t mhdl; 3647 caddr_t vaddr; 3648 size_t nbytes; 3649 uint8_t perm = LDC_MEM_RW; 3650 uint8_t maptype; 3651 int rv = 0; 3652 int i; 3653 3654 ASSERT(vdcp != NULL); 3655 3656 dep = ldep->dep; 3657 mhdl = ldep->desc_mhdl; 3658 3659 switch (ldep->dir) { 3660 case VIO_read_dir: 3661 perm = LDC_MEM_W; 3662 break; 3663 3664 case VIO_write_dir: 3665 perm = LDC_MEM_R; 3666 break; 3667 3668 case VIO_both_dir: 3669 perm = LDC_MEM_RW; 3670 break; 3671 3672 default: 3673 ASSERT(0); /* catch bad programming in vdc */ 3674 } 3675 3676 /* 3677 * LDC expects any addresses passed in to be 8-byte aligned. We need 3678 * to copy the contents of any misaligned buffers to a newly allocated 3679 * buffer and bind it instead (and copy the the contents back to the 3680 * original buffer passed in when depopulating the descriptor) 3681 */ 3682 vaddr = ldep->addr; 3683 nbytes = ldep->nbytes; 3684 if (((uint64_t)vaddr & 0x7) != 0) { 3685 ASSERT(ldep->align_addr == NULL); 3686 ldep->align_addr = 3687 kmem_alloc(sizeof (caddr_t) * 3688 P2ROUNDUP(nbytes, 8), KM_SLEEP); 3689 DMSG(vdcp, 0, "[%d] Misaligned address %p reallocating " 3690 "(buf=%p nb=%ld op=%d)\n", 3691 vdcp->instance, (void *)vaddr, (void *)ldep->align_addr, 3692 nbytes, ldep->operation); 3693 if (perm != LDC_MEM_W) 3694 bcopy(vaddr, ldep->align_addr, nbytes); 3695 vaddr = ldep->align_addr; 3696 } 3697 3698 maptype = LDC_IO_MAP|LDC_SHADOW_MAP; 3699 rv = ldc_mem_bind_handle(mhdl, vaddr, P2ROUNDUP(nbytes, 8), 3700 maptype, perm, &dep->payload.cookie[0], &dep->payload.ncookies); 3701 DMSG(vdcp, 2, "[%d] bound mem handle; ncookies=%d\n", 3702 vdcp->instance, dep->payload.ncookies); 3703 if (rv != 0) { 3704 DMSG(vdcp, 0, "[%d] Failed to bind LDC memory handle " 3705 "(mhdl=%p, buf=%p, err=%d)\n", 3706 vdcp->instance, (void *)mhdl, (void *)vaddr, rv); 3707 if (ldep->align_addr) { 3708 kmem_free(ldep->align_addr, 3709 sizeof (caddr_t) * P2ROUNDUP(nbytes, 8)); 3710 ldep->align_addr = NULL; 3711 } 3712 return (EAGAIN); 3713 } 3714 3715 /* 3716 * Get the other cookies (if any). 3717 */ 3718 for (i = 1; i < dep->payload.ncookies; i++) { 3719 rv = ldc_mem_nextcookie(mhdl, &dep->payload.cookie[i]); 3720 if (rv != 0) { 3721 (void) ldc_mem_unbind_handle(mhdl); 3722 DMSG(vdcp, 0, "?[%d] Failed to get next cookie " 3723 "(mhdl=%lx cnum=%d), err=%d", 3724 vdcp->instance, mhdl, i, rv); 3725 if (ldep->align_addr) { 3726 kmem_free(ldep->align_addr, 3727 sizeof (caddr_t) * ldep->nbytes); 3728 ldep->align_addr = NULL; 3729 } 3730 return (EAGAIN); 3731 } 3732 } 3733 3734 return (rv); 3735 } 3736 3737 /* 3738 * Interrupt handlers for messages from LDC 3739 */ 3740 3741 /* 3742 * Function: 3743 * vdc_handle_cb() 3744 * 3745 * Description: 3746 * 3747 * Arguments: 3748 * event - Type of event (LDC_EVT_xxx) that triggered the callback 3749 * arg - soft state pointer for this instance of the device driver. 3750 * 3751 * Return Code: 3752 * 0 - Success 3753 */ 3754 static uint_t 3755 vdc_handle_cb(uint64_t event, caddr_t arg) 3756 { 3757 ldc_status_t ldc_state; 3758 int rv = 0; 3759 vdc_server_t *srvr = (vdc_server_t *)(void *)arg; 3760 vdc_t *vdc = srvr->vdcp; 3761 3762 ASSERT(vdc != NULL); 3763 3764 DMSG(vdc, 1, "evt=%lx seqID=%ld\n", event, vdc->seq_num); 3765 3766 /* If callback is not for the current server, ignore it */ 3767 mutex_enter(&vdc->lock); 3768 3769 if (vdc->curr_server != srvr) { 3770 DMSG(vdc, 0, "[%d] Ignoring event 0x%lx for port@%ld\n", 3771 vdc->instance, event, srvr->id); 3772 mutex_exit(&vdc->lock); 3773 return (LDC_SUCCESS); 3774 } 3775 3776 /* 3777 * Depending on the type of event that triggered this callback, 3778 * we modify the handshake state or read the data. 3779 * 3780 * NOTE: not done as a switch() as event could be triggered by 3781 * a state change and a read request. Also the ordering of the 3782 * check for the event types is deliberate. 3783 */ 3784 if (event & LDC_EVT_UP) { 3785 DMSG(vdc, 0, "[%d] Received LDC_EVT_UP\n", vdc->instance); 3786 3787 /* get LDC state */ 3788 rv = ldc_status(srvr->ldc_handle, &ldc_state); 3789 if (rv != 0) { 3790 DMSG(vdc, 0, "[%d] Couldn't get LDC status %d", 3791 vdc->instance, rv); 3792 mutex_exit(&vdc->lock); 3793 return (LDC_SUCCESS); 3794 } 3795 if (srvr->ldc_state != LDC_UP && 3796 ldc_state == LDC_UP) { 3797 /* 3798 * Reset the transaction sequence numbers when 3799 * LDC comes up. We then kick off the handshake 3800 * negotiation with the vDisk server. 3801 */ 3802 vdc->seq_num = 1; 3803 vdc->seq_num_reply = 0; 3804 vdc->io_pending = B_TRUE; 3805 srvr->ldc_state = ldc_state; 3806 cv_signal(&vdc->initwait_cv); 3807 cv_signal(&vdc->io_pending_cv); 3808 } 3809 } 3810 3811 if (event & LDC_EVT_READ) { 3812 DMSG(vdc, 1, "[%d] Received LDC_EVT_READ\n", vdc->instance); 3813 mutex_enter(&vdc->read_lock); 3814 cv_signal(&vdc->read_cv); 3815 vdc->read_state = VDC_READ_PENDING; 3816 mutex_exit(&vdc->read_lock); 3817 mutex_exit(&vdc->lock); 3818 3819 /* that's all we have to do - no need to handle DOWN/RESET */ 3820 return (LDC_SUCCESS); 3821 } 3822 3823 if (event & (LDC_EVT_RESET|LDC_EVT_DOWN)) { 3824 3825 DMSG(vdc, 0, "[%d] Received LDC RESET event\n", vdc->instance); 3826 3827 /* 3828 * Need to wake up any readers so they will 3829 * detect that a reset has occurred. 3830 */ 3831 mutex_enter(&vdc->read_lock); 3832 if ((vdc->read_state == VDC_READ_WAITING) || 3833 (vdc->read_state == VDC_READ_RESET)) 3834 cv_signal(&vdc->read_cv); 3835 vdc->read_state = VDC_READ_RESET; 3836 mutex_exit(&vdc->read_lock); 3837 3838 /* wake up any threads waiting for connection to come up */ 3839 if (vdc->state == VDC_STATE_INIT_WAITING) { 3840 vdc->state = VDC_STATE_RESETTING; 3841 cv_signal(&vdc->initwait_cv); 3842 } else if (vdc->state == VDC_STATE_FAILED) { 3843 vdc->io_pending = B_TRUE; 3844 cv_signal(&vdc->io_pending_cv); 3845 } 3846 3847 } 3848 3849 mutex_exit(&vdc->lock); 3850 3851 if (event & ~(LDC_EVT_UP | LDC_EVT_RESET | LDC_EVT_DOWN | LDC_EVT_READ)) 3852 DMSG(vdc, 0, "![%d] Unexpected LDC event (%lx) received", 3853 vdc->instance, event); 3854 3855 return (LDC_SUCCESS); 3856 } 3857 3858 /* 3859 * Function: 3860 * vdc_wait_for_response() 3861 * 3862 * Description: 3863 * Block waiting for a response from the server. If there is 3864 * no data the thread block on the read_cv that is signalled 3865 * by the callback when an EVT_READ occurs. 3866 * 3867 * Arguments: 3868 * vdcp - soft state pointer for this instance of the device driver. 3869 * 3870 * Return Code: 3871 * 0 - Success 3872 */ 3873 static int 3874 vdc_wait_for_response(vdc_t *vdcp, vio_msg_t *msgp) 3875 { 3876 size_t nbytes = sizeof (*msgp); 3877 int status; 3878 3879 ASSERT(vdcp != NULL); 3880 3881 DMSG(vdcp, 1, "[%d] Entered\n", vdcp->instance); 3882 3883 status = vdc_recv(vdcp, msgp, &nbytes); 3884 DMSG(vdcp, 3, "vdc_read() done.. status=0x%x size=0x%x\n", 3885 status, (int)nbytes); 3886 if (status) { 3887 DMSG(vdcp, 0, "?[%d] Error %d reading LDC msg\n", 3888 vdcp->instance, status); 3889 return (status); 3890 } 3891 3892 if (nbytes < sizeof (vio_msg_tag_t)) { 3893 DMSG(vdcp, 0, "?[%d] Expect %lu bytes; recv'd %lu\n", 3894 vdcp->instance, sizeof (vio_msg_tag_t), nbytes); 3895 return (ENOMSG); 3896 } 3897 3898 DMSG(vdcp, 2, "[%d] (%x/%x/%x)\n", vdcp->instance, 3899 msgp->tag.vio_msgtype, 3900 msgp->tag.vio_subtype, 3901 msgp->tag.vio_subtype_env); 3902 3903 /* 3904 * Verify the Session ID of the message 3905 * 3906 * Every message after the Version has been negotiated should 3907 * have the correct session ID set. 3908 */ 3909 if ((msgp->tag.vio_sid != vdcp->session_id) && 3910 (msgp->tag.vio_subtype_env != VIO_VER_INFO)) { 3911 DMSG(vdcp, 0, "[%d] Invalid SID: received 0x%x, " 3912 "expected 0x%lx [seq num %lx @ %d]", 3913 vdcp->instance, msgp->tag.vio_sid, 3914 vdcp->session_id, 3915 ((vio_dring_msg_t *)msgp)->seq_num, 3916 ((vio_dring_msg_t *)msgp)->start_idx); 3917 return (ENOMSG); 3918 } 3919 return (0); 3920 } 3921 3922 3923 /* 3924 * Function: 3925 * vdc_resubmit_backup_dring() 3926 * 3927 * Description: 3928 * Resubmit each descriptor in the backed up dring to 3929 * vDisk server. The Dring was backed up during connection 3930 * reset. 3931 * 3932 * Arguments: 3933 * vdcp - soft state pointer for this instance of the device driver. 3934 * 3935 * Return Code: 3936 * 0 - Success 3937 */ 3938 static int 3939 vdc_resubmit_backup_dring(vdc_t *vdcp) 3940 { 3941 int processed = 0; 3942 int count; 3943 int b_idx; 3944 int rv = 0; 3945 int dring_size; 3946 vdc_local_desc_t *curr_ldep; 3947 3948 ASSERT(MUTEX_NOT_HELD(&vdcp->lock)); 3949 ASSERT(vdcp->state == VDC_STATE_HANDLE_PENDING); 3950 3951 if (vdcp->local_dring_backup == NULL) { 3952 /* the pending requests have already been processed */ 3953 return (0); 3954 } 3955 3956 DMSG(vdcp, 1, "restoring pending dring entries (len=%d, tail=%d)\n", 3957 vdcp->local_dring_backup_len, vdcp->local_dring_backup_tail); 3958 3959 /* 3960 * Walk the backup copy of the local descriptor ring and 3961 * resubmit all the outstanding transactions. 3962 */ 3963 b_idx = vdcp->local_dring_backup_tail; 3964 for (count = 0; count < vdcp->local_dring_backup_len; count++) { 3965 3966 curr_ldep = &(vdcp->local_dring_backup[b_idx]); 3967 3968 /* only resubmit outstanding transactions */ 3969 if (!curr_ldep->is_free) { 3970 3971 DMSG(vdcp, 1, "resubmitting entry idx=%x\n", b_idx); 3972 3973 rv = vdc_do_op(vdcp, curr_ldep->operation, 3974 curr_ldep->addr, curr_ldep->nbytes, 3975 curr_ldep->slice, curr_ldep->offset, 3976 curr_ldep->buf, curr_ldep->dir, 3977 (curr_ldep->flags & ~VDC_OP_STATE_RUNNING) | 3978 VDC_OP_RESUBMIT); 3979 3980 if (rv) { 3981 DMSG(vdcp, 1, "[%d] resubmit entry %d failed\n", 3982 vdcp->instance, b_idx); 3983 goto done; 3984 } 3985 3986 /* 3987 * Mark this entry as free so that we will not resubmit 3988 * this "done" request again, if we were to use the same 3989 * backup_dring again in future. This could happen when 3990 * a reset happens while processing the backup_dring. 3991 */ 3992 curr_ldep->is_free = B_TRUE; 3993 processed++; 3994 } 3995 3996 /* get the next element to submit */ 3997 if (++b_idx >= vdcp->local_dring_backup_len) 3998 b_idx = 0; 3999 } 4000 4001 /* all done - now clear up pending dring copy */ 4002 dring_size = vdcp->local_dring_backup_len * 4003 sizeof (vdcp->local_dring_backup[0]); 4004 4005 (void) kmem_free(vdcp->local_dring_backup, dring_size); 4006 4007 vdcp->local_dring_backup = NULL; 4008 4009 done: 4010 DTRACE_PROBE2(processed, int, processed, vdc_t *, vdcp); 4011 4012 return (rv); 4013 } 4014 4015 /* 4016 * Function: 4017 * vdc_cancel_backup_dring 4018 * 4019 * Description: 4020 * Cancel each descriptor in the backed up dring to vDisk server. 4021 * The Dring was backed up during connection reset. 4022 * 4023 * Arguments: 4024 * vdcp - soft state pointer for this instance of the device driver. 4025 * 4026 * Return Code: 4027 * None 4028 */ 4029 void 4030 vdc_cancel_backup_dring(vdc_t *vdcp) 4031 { 4032 vdc_local_desc_t *ldep; 4033 struct buf *bufp; 4034 int count; 4035 int b_idx; 4036 int dring_size; 4037 int cancelled = 0; 4038 4039 ASSERT(MUTEX_HELD(&vdcp->lock)); 4040 ASSERT(vdcp->state == VDC_STATE_FAILED); 4041 4042 if (vdcp->local_dring_backup == NULL) { 4043 /* the pending requests have already been processed */ 4044 return; 4045 } 4046 4047 DMSG(vdcp, 1, "cancelling pending dring entries (len=%d, tail=%d)\n", 4048 vdcp->local_dring_backup_len, vdcp->local_dring_backup_tail); 4049 4050 /* 4051 * Walk the backup copy of the local descriptor ring and 4052 * cancel all the outstanding transactions. 4053 */ 4054 b_idx = vdcp->local_dring_backup_tail; 4055 for (count = 0; count < vdcp->local_dring_backup_len; count++) { 4056 4057 ldep = &(vdcp->local_dring_backup[b_idx]); 4058 4059 /* only cancel outstanding transactions */ 4060 if (!ldep->is_free) { 4061 4062 DMSG(vdcp, 1, "cancelling entry idx=%x\n", b_idx); 4063 cancelled++; 4064 4065 /* 4066 * All requests have already been cleared from the 4067 * local descriptor ring and the LDC channel has been 4068 * reset so we will never get any reply for these 4069 * requests. Now we just have to notify threads waiting 4070 * for replies that the request has failed. 4071 */ 4072 bufp = ldep->buf; 4073 ASSERT(bufp != NULL); 4074 bufp->b_resid = bufp->b_bcount; 4075 if (ldep->operation == VD_OP_BREAD || 4076 ldep->operation == VD_OP_BWRITE) { 4077 VD_UPDATE_ERR_STATS(vdcp, vd_softerrs); 4078 VD_KSTAT_WAITQ_EXIT(vdcp); 4079 DTRACE_IO1(done, buf_t *, bufp); 4080 } 4081 bioerror(bufp, EIO); 4082 biodone(bufp); 4083 } 4084 4085 /* get the next element to cancel */ 4086 if (++b_idx >= vdcp->local_dring_backup_len) 4087 b_idx = 0; 4088 } 4089 4090 /* all done - now clear up pending dring copy */ 4091 dring_size = vdcp->local_dring_backup_len * 4092 sizeof (vdcp->local_dring_backup[0]); 4093 4094 (void) kmem_free(vdcp->local_dring_backup, dring_size); 4095 4096 vdcp->local_dring_backup = NULL; 4097 4098 DTRACE_PROBE2(cancelled, int, cancelled, vdc_t *, vdcp); 4099 } 4100 4101 /* 4102 * Function: 4103 * vdc_connection_timeout 4104 * 4105 * Description: 4106 * This function is invoked if the timeout set to establish the connection 4107 * with vds expires. This will happen if we spend too much time in the 4108 * VDC_STATE_INIT_WAITING, VDC_STATE_NEGOTIATE or VDC_STATE_HANDLE_PENDING 4109 * states. 4110 * 4111 * Arguments: 4112 * arg - argument of the timeout function actually a soft state 4113 * pointer for the instance of the device driver. 4114 * 4115 * Return Code: 4116 * None 4117 */ 4118 void 4119 vdc_connection_timeout(void *arg) 4120 { 4121 vdc_t *vdcp = (vdc_t *)arg; 4122 4123 mutex_enter(&vdcp->lock); 4124 4125 vdcp->ctimeout_reached = B_TRUE; 4126 4127 mutex_exit(&vdcp->lock); 4128 } 4129 4130 /* 4131 * Function: 4132 * vdc_backup_local_dring() 4133 * 4134 * Description: 4135 * Backup the current dring in the event of a reset. The Dring 4136 * transactions will be resubmitted to the server when the 4137 * connection is restored. 4138 * 4139 * Arguments: 4140 * vdcp - soft state pointer for this instance of the device driver. 4141 * 4142 * Return Code: 4143 * NONE 4144 */ 4145 static void 4146 vdc_backup_local_dring(vdc_t *vdcp) 4147 { 4148 int b_idx, count, dring_size; 4149 vdc_local_desc_t *curr_ldep; 4150 4151 ASSERT(MUTEX_HELD(&vdcp->lock)); 4152 ASSERT(vdcp->state == VDC_STATE_RESETTING); 4153 4154 /* 4155 * If the backup dring is stil around, it means 4156 * that the last restore did not complete. However, 4157 * since we never got back into the running state, 4158 * the backup copy we have is still valid. 4159 */ 4160 if (vdcp->local_dring_backup != NULL) { 4161 DMSG(vdcp, 1, "reusing local descriptor ring backup " 4162 "(len=%d, tail=%d)\n", vdcp->local_dring_backup_len, 4163 vdcp->local_dring_backup_tail); 4164 return; 4165 } 4166 4167 /* 4168 * The backup dring can be NULL and the local dring may not be 4169 * initialized. This can happen if we had a reset while establishing 4170 * a new connection but after the connection has timed out. In that 4171 * case the backup dring is NULL because the requests have been 4172 * cancelled and the request occured before the local dring is 4173 * initialized. 4174 */ 4175 if (!(vdcp->initialized & VDC_DRING_LOCAL)) 4176 return; 4177 4178 DMSG(vdcp, 1, "backing up the local descriptor ring (len=%d, " 4179 "tail=%d)\n", vdcp->dring_len, vdcp->dring_curr_idx); 4180 4181 dring_size = vdcp->dring_len * sizeof (vdcp->local_dring[0]); 4182 4183 vdcp->local_dring_backup = kmem_alloc(dring_size, KM_SLEEP); 4184 bcopy(vdcp->local_dring, vdcp->local_dring_backup, dring_size); 4185 4186 vdcp->local_dring_backup_tail = vdcp->dring_curr_idx; 4187 vdcp->local_dring_backup_len = vdcp->dring_len; 4188 4189 /* 4190 * At this point, pending read or write I/Os are recorded in the 4191 * runq. We update the I/O statistics to indicate that they are now 4192 * back in the waitq. 4193 */ 4194 b_idx = vdcp->local_dring_backup_tail; 4195 for (count = 0; count < vdcp->local_dring_backup_len; count++) { 4196 4197 curr_ldep = &(vdcp->local_dring_backup[b_idx]); 4198 4199 if (!curr_ldep->is_free && 4200 (curr_ldep->operation == VD_OP_BREAD || 4201 curr_ldep->operation == VD_OP_BWRITE)) { 4202 VD_KSTAT_RUNQ_BACK_TO_WAITQ(vdcp); 4203 } 4204 4205 /* get the next element */ 4206 if (++b_idx >= vdcp->local_dring_backup_len) 4207 b_idx = 0; 4208 } 4209 4210 } 4211 4212 static void 4213 vdc_switch_server(vdc_t *vdcp) 4214 { 4215 int rv; 4216 vdc_server_t *curr_server, *new_server; 4217 4218 ASSERT(MUTEX_HELD(&vdcp->lock)); 4219 4220 /* if there is only one server return back */ 4221 if (vdcp->num_servers == 1) { 4222 return; 4223 } 4224 4225 /* Get current and next server */ 4226 curr_server = vdcp->curr_server; 4227 new_server = 4228 (curr_server->next) ? curr_server->next : vdcp->server_list; 4229 ASSERT(curr_server != new_server); 4230 4231 /* bring current server's channel down */ 4232 rv = ldc_down(curr_server->ldc_handle); 4233 if (rv) { 4234 DMSG(vdcp, 0, "[%d] Cannot bring channel down, port %ld\n", 4235 vdcp->instance, curr_server->id); 4236 return; 4237 } 4238 4239 /* switch the server */ 4240 vdcp->curr_server = new_server; 4241 4242 DMSG(vdcp, 0, "[%d] Switched to next vdisk server, port@%ld, ldc@%ld\n", 4243 vdcp->instance, vdcp->curr_server->id, vdcp->curr_server->ldc_id); 4244 } 4245 4246 static void 4247 vdc_print_svc_status(vdc_t *vdcp) 4248 { 4249 int instance; 4250 uint64_t ldc_id, port_id; 4251 vdc_service_state_t svc_state; 4252 4253 ASSERT(mutex_owned(&vdcp->lock)); 4254 4255 svc_state = vdcp->curr_server->svc_state; 4256 4257 if (vdcp->curr_server->log_state == svc_state) 4258 return; 4259 4260 instance = vdcp->instance; 4261 ldc_id = vdcp->curr_server->ldc_id; 4262 port_id = vdcp->curr_server->id; 4263 4264 switch (svc_state) { 4265 4266 case VDC_SERVICE_OFFLINE: 4267 cmn_err(CE_CONT, "?vdisk@%d is offline\n", instance); 4268 break; 4269 4270 case VDC_SERVICE_CONNECTED: 4271 cmn_err(CE_CONT, "?vdisk@%d is connected using ldc@%ld,%ld\n", 4272 instance, ldc_id, port_id); 4273 break; 4274 4275 case VDC_SERVICE_ONLINE: 4276 cmn_err(CE_CONT, "?vdisk@%d is online using ldc@%ld,%ld\n", 4277 instance, ldc_id, port_id); 4278 break; 4279 4280 case VDC_SERVICE_FAILED: 4281 cmn_err(CE_CONT, "?vdisk@%d access to service failed " 4282 "using ldc@%ld,%ld\n", instance, ldc_id, port_id); 4283 break; 4284 4285 case VDC_SERVICE_FAULTED: 4286 cmn_err(CE_CONT, "?vdisk@%d access to backend failed " 4287 "using ldc@%ld,%ld\n", instance, ldc_id, port_id); 4288 break; 4289 4290 default: 4291 ASSERT(0); 4292 break; 4293 } 4294 4295 vdcp->curr_server->log_state = svc_state; 4296 } 4297 4298 /* 4299 * Function: 4300 * vdc_handshake_retry 4301 * 4302 * Description: 4303 * This function indicates if the handshake should be retried or not. 4304 * This depends on the lifecycle of the driver: 4305 * 4306 * VDC_LC_ATTACHING: the handshake is retried until we have tried 4307 * a handshake with each server. We don't care how far each handshake 4308 * went, the goal is just to try the handshake. We want to minimize the 4309 * the time spent doing the attach because this is locking the device 4310 * tree. 4311 * 4312 * VDC_LC_ONLINE_PENDING: the handshake is retried while we haven't done 4313 * consecutive attribute negotiations with each server, and we haven't 4314 * reached a minimum total of consecutive negotiations (hattr_min). The 4315 * number of attribution negotiations determines the time spent before 4316 * failing pending I/Os if the handshake is not successful. 4317 * 4318 * VDC_LC_ONLINE: the handshake is always retried, until we have a 4319 * successful handshake with a server. 4320 * 4321 * VDC_LC_DETACHING: N/A 4322 * 4323 * Arguments: 4324 * hshake_cnt - number of handshake attempts 4325 * hattr_cnt - number of attribute negotiation attempts 4326 * 4327 * Return Code: 4328 * B_TRUE - handshake should be retried 4329 * B_FALSE - handshake should not be retried 4330 */ 4331 static boolean_t 4332 vdc_handshake_retry(vdc_t *vdcp, int hshake_cnt, int hattr_cnt) 4333 { 4334 int hattr_total = 0; 4335 vdc_server_t *srvr; 4336 4337 ASSERT(vdcp->lifecycle != VDC_LC_DETACHING); 4338 4339 /* update handshake counters */ 4340 vdcp->curr_server->hshake_cnt = hshake_cnt; 4341 vdcp->curr_server->hattr_cnt = hattr_cnt; 4342 4343 /* 4344 * If no attribute negotiation was done then we reset the total 4345 * number otherwise we cumulate the number. 4346 */ 4347 if (hattr_cnt == 0) 4348 vdcp->curr_server->hattr_total = 0; 4349 else 4350 vdcp->curr_server->hattr_total += hattr_cnt; 4351 4352 /* 4353 * If we are online (i.e. at least one handshake was successfully 4354 * completed) then we always retry the handshake. 4355 */ 4356 if (vdcp->lifecycle == VDC_LC_ONLINE) 4357 return (B_TRUE); 4358 4359 /* 4360 * If we are attaching then we retry the handshake only if we haven't 4361 * tried with all servers. 4362 */ 4363 if (vdcp->lifecycle == VDC_LC_ATTACHING) { 4364 4365 for (srvr = vdcp->server_list; srvr != NULL; 4366 srvr = srvr->next) { 4367 if (srvr->hshake_cnt == 0) { 4368 return (B_TRUE); 4369 } 4370 } 4371 4372 return (B_FALSE); 4373 } 4374 4375 /* 4376 * Here we are in the case where we haven't completed any handshake 4377 * successfully yet. 4378 */ 4379 ASSERT(vdcp->lifecycle == VDC_LC_ONLINE_PENDING); 4380 4381 /* 4382 * We retry the handshake if we haven't done an attribute negotiation 4383 * with each server. This is to handle the case where one service domain 4384 * is down. 4385 */ 4386 for (srvr = vdcp->server_list; srvr != NULL; srvr = srvr->next) { 4387 if (srvr->hattr_cnt == 0) { 4388 return (B_TRUE); 4389 } 4390 hattr_total += srvr->hattr_total; 4391 } 4392 4393 /* 4394 * We retry the handshake if we haven't reached the minimum number of 4395 * attribute negotiation. 4396 */ 4397 return (hattr_total < vdcp->hattr_min); 4398 } 4399 4400 /* -------------------------------------------------------------------------- */ 4401 4402 /* 4403 * The following functions process the incoming messages from vds 4404 */ 4405 4406 /* 4407 * Function: 4408 * vdc_process_msg_thread() 4409 * 4410 * Description: 4411 * 4412 * Main VDC message processing thread. Each vDisk instance 4413 * consists of a copy of this thread. This thread triggers 4414 * all the handshakes and data exchange with the server. It 4415 * also handles all channel resets 4416 * 4417 * Arguments: 4418 * vdc - soft state pointer for this instance of the device driver. 4419 * 4420 * Return Code: 4421 * None 4422 */ 4423 static void 4424 vdc_process_msg_thread(vdc_t *vdcp) 4425 { 4426 boolean_t failure_msg = B_FALSE; 4427 int status; 4428 int ctimeout; 4429 timeout_id_t tmid = 0; 4430 clock_t ldcup_timeout = 0; 4431 vdc_server_t *srvr; 4432 vdc_service_state_t svc_state; 4433 int hshake_cnt = 0; 4434 int hattr_cnt = 0; 4435 4436 mutex_enter(&vdcp->lock); 4437 4438 ASSERT(vdcp->lifecycle == VDC_LC_ATTACHING); 4439 4440 for (;;) { 4441 4442 #define Q(_s) (vdcp->state == _s) ? #_s : 4443 DMSG(vdcp, 3, "state = %d (%s)\n", vdcp->state, 4444 Q(VDC_STATE_INIT) 4445 Q(VDC_STATE_INIT_WAITING) 4446 Q(VDC_STATE_NEGOTIATE) 4447 Q(VDC_STATE_HANDLE_PENDING) 4448 Q(VDC_STATE_FAULTED) 4449 Q(VDC_STATE_FAILED) 4450 Q(VDC_STATE_RUNNING) 4451 Q(VDC_STATE_RESETTING) 4452 Q(VDC_STATE_DETACH) 4453 "UNKNOWN"); 4454 #undef Q 4455 4456 switch (vdcp->state) { 4457 case VDC_STATE_INIT: 4458 4459 /* 4460 * If requested, start a timeout to check if the 4461 * connection with vds is established in the 4462 * specified delay. If the timeout expires, we 4463 * will cancel any pending request. 4464 * 4465 * If some reset have occurred while establishing 4466 * the connection, we already have a timeout armed 4467 * and in that case we don't need to arm a new one. 4468 * 4469 * The same rule applies when there are multiple vds'. 4470 * If either a connection cannot be established or 4471 * the handshake times out, the connection thread will 4472 * try another server. The 'ctimeout' will report 4473 * back an error after it expires irrespective of 4474 * whether the vdisk is trying to connect to just 4475 * one or multiple servers. 4476 */ 4477 ctimeout = (vdc_timeout != 0)? 4478 vdc_timeout : vdcp->curr_server->ctimeout; 4479 4480 if (ctimeout != 0 && tmid == 0) { 4481 tmid = timeout(vdc_connection_timeout, vdcp, 4482 ctimeout * drv_usectohz(MICROSEC)); 4483 } 4484 4485 /* Switch to STATE_DETACH if drv is detaching */ 4486 if (vdcp->lifecycle == VDC_LC_DETACHING) { 4487 vdcp->state = VDC_STATE_DETACH; 4488 break; 4489 } 4490 4491 /* Check if the timeout has been reached */ 4492 if (vdcp->ctimeout_reached) { 4493 ASSERT(tmid != 0); 4494 tmid = 0; 4495 vdcp->state = VDC_STATE_FAILED; 4496 break; 4497 } 4498 4499 /* 4500 * Switch to another server when we reach the limit of 4501 * the number of handshake per server or if we have done 4502 * an attribute negotiation. 4503 */ 4504 if (hshake_cnt >= vdc_hshake_retries || hattr_cnt > 0) { 4505 4506 if (!vdc_handshake_retry(vdcp, hshake_cnt, 4507 hattr_cnt)) { 4508 DMSG(vdcp, 0, "[%d] too many " 4509 "handshakes", vdcp->instance); 4510 vdcp->state = VDC_STATE_FAILED; 4511 break; 4512 } 4513 4514 vdc_switch_server(vdcp); 4515 4516 hshake_cnt = 0; 4517 hattr_cnt = 0; 4518 } 4519 4520 hshake_cnt++; 4521 4522 /* Bring up connection with vds via LDC */ 4523 status = vdc_start_ldc_connection(vdcp); 4524 if (status != EINVAL) { 4525 vdcp->state = VDC_STATE_INIT_WAITING; 4526 } else { 4527 vdcp->curr_server->svc_state = 4528 VDC_SERVICE_FAILED; 4529 vdc_print_svc_status(vdcp); 4530 } 4531 break; 4532 4533 case VDC_STATE_INIT_WAITING: 4534 4535 /* if channel is UP, start negotiation */ 4536 if (vdcp->curr_server->ldc_state == LDC_UP) { 4537 vdcp->state = VDC_STATE_NEGOTIATE; 4538 break; 4539 } 4540 4541 /* 4542 * Wait for LDC_UP. If it times out and we have multiple 4543 * servers then we will retry using a different server. 4544 */ 4545 ldcup_timeout = ddi_get_lbolt() + (vdc_ldcup_timeout * 4546 drv_usectohz(MICROSEC)); 4547 status = cv_timedwait(&vdcp->initwait_cv, &vdcp->lock, 4548 ldcup_timeout); 4549 if (status == -1 && 4550 vdcp->state == VDC_STATE_INIT_WAITING && 4551 vdcp->curr_server->ldc_state != LDC_UP) { 4552 /* timed out & still waiting */ 4553 vdcp->curr_server->svc_state = 4554 VDC_SERVICE_FAILED; 4555 vdc_print_svc_status(vdcp); 4556 vdcp->state = VDC_STATE_INIT; 4557 break; 4558 } 4559 4560 if (vdcp->state != VDC_STATE_INIT_WAITING) { 4561 DMSG(vdcp, 0, 4562 "state moved to %d out from under us...\n", 4563 vdcp->state); 4564 } 4565 break; 4566 4567 case VDC_STATE_NEGOTIATE: 4568 switch (status = vdc_ver_negotiation(vdcp)) { 4569 case 0: 4570 break; 4571 default: 4572 DMSG(vdcp, 0, "ver negotiate failed (%d)..\n", 4573 status); 4574 goto reset; 4575 } 4576 4577 hattr_cnt++; 4578 4579 switch (status = vdc_attr_negotiation(vdcp)) { 4580 case 0: 4581 break; 4582 default: 4583 DMSG(vdcp, 0, "attr negotiate failed (%d)..\n", 4584 status); 4585 goto reset; 4586 } 4587 4588 switch (status = vdc_dring_negotiation(vdcp)) { 4589 case 0: 4590 break; 4591 default: 4592 DMSG(vdcp, 0, "dring negotiate failed (%d)..\n", 4593 status); 4594 goto reset; 4595 } 4596 4597 switch (status = vdc_rdx_exchange(vdcp)) { 4598 case 0: 4599 vdcp->state = VDC_STATE_HANDLE_PENDING; 4600 goto done; 4601 default: 4602 DMSG(vdcp, 0, "RDX xchg failed ..(%d)\n", 4603 status); 4604 goto reset; 4605 } 4606 reset: 4607 DMSG(vdcp, 0, "negotiation failed: resetting (%d)\n", 4608 status); 4609 vdcp->state = VDC_STATE_RESETTING; 4610 vdcp->self_reset = B_TRUE; 4611 vdcp->curr_server->svc_state = VDC_SERVICE_FAILED; 4612 vdc_print_svc_status(vdcp); 4613 done: 4614 DMSG(vdcp, 0, "negotiation complete (state=0x%x)...\n", 4615 vdcp->state); 4616 break; 4617 4618 case VDC_STATE_HANDLE_PENDING: 4619 4620 DMSG(vdcp, 0, "[%d] connection to service domain is up", 4621 vdcp->instance); 4622 vdcp->curr_server->svc_state = VDC_SERVICE_CONNECTED; 4623 4624 mutex_exit(&vdcp->lock); 4625 4626 /* 4627 * If we have multiple servers, check that the backend 4628 * is effectively available before resubmitting any IO. 4629 */ 4630 if (vdcp->num_servers > 1 && 4631 vdc_eio_check(vdcp, 0) != 0) { 4632 mutex_enter(&vdcp->lock); 4633 vdcp->curr_server->svc_state = 4634 VDC_SERVICE_FAULTED; 4635 vdcp->state = VDC_STATE_FAULTED; 4636 break; 4637 } 4638 4639 if (tmid != 0) { 4640 (void) untimeout(tmid); 4641 tmid = 0; 4642 vdcp->ctimeout_reached = B_FALSE; 4643 } 4644 4645 /* 4646 * Setup devid 4647 */ 4648 (void) vdc_setup_devid(vdcp); 4649 4650 status = vdc_resubmit_backup_dring(vdcp); 4651 4652 mutex_enter(&vdcp->lock); 4653 4654 if (status) { 4655 vdcp->state = VDC_STATE_RESETTING; 4656 vdcp->self_reset = B_TRUE; 4657 vdcp->curr_server->svc_state = 4658 VDC_SERVICE_FAILED; 4659 vdc_print_svc_status(vdcp); 4660 } else { 4661 vdcp->state = VDC_STATE_RUNNING; 4662 } 4663 break; 4664 4665 case VDC_STATE_FAULTED: 4666 /* 4667 * Server is faulted because the backend is unavailable. 4668 * If all servers are faulted then we mark the service 4669 * as failed, otherwise we reset to switch to another 4670 * server. 4671 */ 4672 vdc_print_svc_status(vdcp); 4673 4674 /* check if all servers are faulted */ 4675 for (srvr = vdcp->server_list; srvr != NULL; 4676 srvr = srvr->next) { 4677 svc_state = srvr->svc_state; 4678 if (svc_state != VDC_SERVICE_FAULTED) 4679 break; 4680 } 4681 4682 if (srvr != NULL) { 4683 vdcp->state = VDC_STATE_RESETTING; 4684 vdcp->self_reset = B_TRUE; 4685 } else { 4686 vdcp->state = VDC_STATE_FAILED; 4687 } 4688 break; 4689 4690 case VDC_STATE_FAILED: 4691 /* 4692 * We reach this state when we are unable to access the 4693 * backend from any server, either because of a maximum 4694 * connection retries or timeout, or because the backend 4695 * is unavailable. 4696 * 4697 * Then we cancel the backup DRing so that errors get 4698 * reported and we wait for a new I/O before attempting 4699 * another connection. 4700 */ 4701 4702 cmn_err(CE_NOTE, "vdisk@%d disk access failed", 4703 vdcp->instance); 4704 failure_msg = B_TRUE; 4705 4706 if (vdcp->lifecycle == VDC_LC_ATTACHING) { 4707 vdcp->lifecycle = VDC_LC_ONLINE_PENDING; 4708 vdcp->hattr_min = vdc_hattr_min_initial; 4709 } else { 4710 vdcp->hattr_min = vdc_hattr_min; 4711 } 4712 4713 /* cancel any timeout */ 4714 if (tmid != 0) { 4715 (void) untimeout(tmid); 4716 tmid = 0; 4717 } 4718 4719 /* cancel pending I/Os */ 4720 cv_broadcast(&vdcp->running_cv); 4721 vdc_cancel_backup_dring(vdcp); 4722 4723 /* wait for new I/O */ 4724 while (!vdcp->io_pending) 4725 cv_wait(&vdcp->io_pending_cv, &vdcp->lock); 4726 4727 /* 4728 * There's a new IO pending. Try to re-establish a 4729 * connection. Mark all services as offline, so that 4730 * we don't stop again before having retried all 4731 * servers. 4732 */ 4733 for (srvr = vdcp->server_list; srvr != NULL; 4734 srvr = srvr->next) { 4735 srvr->svc_state = VDC_SERVICE_OFFLINE; 4736 srvr->hshake_cnt = 0; 4737 srvr->hattr_cnt = 0; 4738 srvr->hattr_total = 0; 4739 } 4740 4741 /* reset variables */ 4742 hshake_cnt = 0; 4743 hattr_cnt = 0; 4744 vdcp->ctimeout_reached = B_FALSE; 4745 4746 vdcp->state = VDC_STATE_RESETTING; 4747 vdcp->self_reset = B_TRUE; 4748 break; 4749 4750 /* enter running state */ 4751 case VDC_STATE_RUNNING: 4752 4753 if (vdcp->lifecycle == VDC_LC_DETACHING) { 4754 vdcp->state = VDC_STATE_DETACH; 4755 break; 4756 } 4757 4758 vdcp->lifecycle = VDC_LC_ONLINE; 4759 4760 if (failure_msg) { 4761 cmn_err(CE_NOTE, "vdisk@%d disk access " 4762 "recovered", vdcp->instance); 4763 failure_msg = B_FALSE; 4764 } 4765 4766 /* 4767 * Signal anyone waiting for the connection 4768 * to come on line. 4769 */ 4770 cv_broadcast(&vdcp->running_cv); 4771 4772 /* backend has to be checked after reset */ 4773 if (vdcp->failfast_interval != 0 || 4774 vdcp->num_servers > 1) 4775 cv_signal(&vdcp->eio_cv); 4776 4777 /* ownership is lost during reset */ 4778 if (vdcp->ownership & VDC_OWNERSHIP_WANTED) 4779 vdcp->ownership |= VDC_OWNERSHIP_RESET; 4780 cv_signal(&vdcp->ownership_cv); 4781 4782 vdcp->curr_server->svc_state = VDC_SERVICE_ONLINE; 4783 vdc_print_svc_status(vdcp); 4784 4785 mutex_exit(&vdcp->lock); 4786 4787 for (;;) { 4788 vio_msg_t msg; 4789 status = vdc_wait_for_response(vdcp, &msg); 4790 if (status) break; 4791 4792 DMSG(vdcp, 1, "[%d] new pkt(s) available\n", 4793 vdcp->instance); 4794 status = vdc_process_data_msg(vdcp, &msg); 4795 if (status) { 4796 DMSG(vdcp, 1, "[%d] process_data_msg " 4797 "returned err=%d\n", vdcp->instance, 4798 status); 4799 break; 4800 } 4801 4802 } 4803 4804 mutex_enter(&vdcp->lock); 4805 4806 /* all servers are now offline */ 4807 for (srvr = vdcp->server_list; srvr != NULL; 4808 srvr = srvr->next) { 4809 srvr->svc_state = VDC_SERVICE_OFFLINE; 4810 srvr->log_state = VDC_SERVICE_NONE; 4811 srvr->hshake_cnt = 0; 4812 srvr->hattr_cnt = 0; 4813 srvr->hattr_total = 0; 4814 } 4815 4816 hshake_cnt = 0; 4817 hattr_cnt = 0; 4818 4819 vdc_print_svc_status(vdcp); 4820 4821 vdcp->state = VDC_STATE_RESETTING; 4822 vdcp->self_reset = B_TRUE; 4823 break; 4824 4825 case VDC_STATE_RESETTING: 4826 /* 4827 * When we reach this state, we either come from the 4828 * VDC_STATE_RUNNING state and we can have pending 4829 * request but no timeout is armed; or we come from 4830 * the VDC_STATE_INIT_WAITING, VDC_NEGOTIATE or 4831 * VDC_HANDLE_PENDING state and there is no pending 4832 * request or pending requests have already been copied 4833 * into the backup dring. So we can safely keep the 4834 * connection timeout armed while we are in this state. 4835 */ 4836 4837 DMSG(vdcp, 0, "Initiating channel reset " 4838 "(pending = %d)\n", (int)vdcp->threads_pending); 4839 4840 if (vdcp->self_reset) { 4841 DMSG(vdcp, 0, 4842 "[%d] calling stop_ldc_connection.\n", 4843 vdcp->instance); 4844 status = vdc_stop_ldc_connection(vdcp); 4845 vdcp->self_reset = B_FALSE; 4846 } 4847 4848 /* 4849 * Wait for all threads currently waiting 4850 * for a free dring entry to use. 4851 */ 4852 while (vdcp->threads_pending) { 4853 cv_broadcast(&vdcp->membind_cv); 4854 cv_broadcast(&vdcp->dring_free_cv); 4855 mutex_exit(&vdcp->lock); 4856 /* give the waiters enough time to wake up */ 4857 delay(vdc_hz_min_ldc_delay); 4858 mutex_enter(&vdcp->lock); 4859 } 4860 4861 ASSERT(vdcp->threads_pending == 0); 4862 4863 /* Sanity check that no thread is receiving */ 4864 ASSERT(vdcp->read_state != VDC_READ_WAITING); 4865 4866 vdcp->read_state = VDC_READ_IDLE; 4867 vdcp->io_pending = B_FALSE; 4868 4869 /* 4870 * Cleanup any pending eio. These I/Os are going to 4871 * be resubmitted. 4872 */ 4873 vdc_eio_unqueue(vdcp, 0, B_FALSE); 4874 4875 vdc_backup_local_dring(vdcp); 4876 4877 /* cleanup the old d-ring */ 4878 vdc_destroy_descriptor_ring(vdcp); 4879 4880 /* go and start again */ 4881 vdcp->state = VDC_STATE_INIT; 4882 4883 break; 4884 4885 case VDC_STATE_DETACH: 4886 DMSG(vdcp, 0, "[%d] Reset thread exit cleanup ..\n", 4887 vdcp->instance); 4888 4889 /* cancel any pending timeout */ 4890 mutex_exit(&vdcp->lock); 4891 if (tmid != 0) { 4892 (void) untimeout(tmid); 4893 tmid = 0; 4894 } 4895 mutex_enter(&vdcp->lock); 4896 4897 /* 4898 * Signal anyone waiting for connection 4899 * to come online 4900 */ 4901 cv_broadcast(&vdcp->running_cv); 4902 4903 while (vdcp->sync_op_cnt > 0) { 4904 cv_broadcast(&vdcp->sync_blocked_cv); 4905 mutex_exit(&vdcp->lock); 4906 /* give the waiters enough time to wake up */ 4907 delay(vdc_hz_min_ldc_delay); 4908 mutex_enter(&vdcp->lock); 4909 } 4910 4911 mutex_exit(&vdcp->lock); 4912 4913 DMSG(vdcp, 0, "[%d] Msg processing thread exiting ..\n", 4914 vdcp->instance); 4915 thread_exit(); 4916 break; 4917 } 4918 } 4919 } 4920 4921 4922 /* 4923 * Function: 4924 * vdc_process_data_msg() 4925 * 4926 * Description: 4927 * This function is called by the message processing thread each time 4928 * a message with a msgtype of VIO_TYPE_DATA is received. It will either 4929 * be an ACK or NACK from vds[1] which vdc handles as follows. 4930 * ACK - wake up the waiting thread 4931 * NACK - resend any messages necessary 4932 * 4933 * [1] Although the message format allows it, vds should not send a 4934 * VIO_SUBTYPE_INFO message to vdc asking it to read data; if for 4935 * some bizarre reason it does, vdc will reset the connection. 4936 * 4937 * Arguments: 4938 * vdc - soft state pointer for this instance of the device driver. 4939 * msg - the LDC message sent by vds 4940 * 4941 * Return Code: 4942 * 0 - Success. 4943 * > 0 - error value returned by LDC 4944 */ 4945 static int 4946 vdc_process_data_msg(vdc_t *vdcp, vio_msg_t *msg) 4947 { 4948 int status = 0; 4949 vio_dring_msg_t *dring_msg; 4950 vdc_local_desc_t *ldep = NULL; 4951 int start, end; 4952 int idx; 4953 int op; 4954 4955 dring_msg = (vio_dring_msg_t *)msg; 4956 4957 ASSERT(msg->tag.vio_msgtype == VIO_TYPE_DATA); 4958 ASSERT(vdcp != NULL); 4959 4960 mutex_enter(&vdcp->lock); 4961 4962 /* 4963 * Check to see if the message has bogus data 4964 */ 4965 idx = start = dring_msg->start_idx; 4966 end = dring_msg->end_idx; 4967 if ((start >= vdcp->dring_len) || 4968 (end >= vdcp->dring_len) || (end < -1)) { 4969 /* 4970 * Update the I/O statistics to indicate that an error ocurred. 4971 * No need to update the wait/run queues as no specific read or 4972 * write request is being completed in response to this 'msg'. 4973 */ 4974 VD_UPDATE_ERR_STATS(vdcp, vd_softerrs); 4975 DMSG(vdcp, 0, "[%d] Bogus ACK data : start %d, end %d\n", 4976 vdcp->instance, start, end); 4977 mutex_exit(&vdcp->lock); 4978 return (EINVAL); 4979 } 4980 4981 /* 4982 * Verify that the sequence number is what vdc expects. 4983 */ 4984 switch (vdc_verify_seq_num(vdcp, dring_msg)) { 4985 case VDC_SEQ_NUM_TODO: 4986 break; /* keep processing this message */ 4987 case VDC_SEQ_NUM_SKIP: 4988 mutex_exit(&vdcp->lock); 4989 return (0); 4990 case VDC_SEQ_NUM_INVALID: 4991 /* 4992 * Update the I/O statistics to indicate that an error ocurred. 4993 * No need to update the wait/run queues as no specific read or 4994 * write request is being completed in response to this 'msg'. 4995 */ 4996 VD_UPDATE_ERR_STATS(vdcp, vd_softerrs); 4997 DMSG(vdcp, 0, "[%d] invalid seqno\n", vdcp->instance); 4998 mutex_exit(&vdcp->lock); 4999 return (ENXIO); 5000 } 5001 5002 if (msg->tag.vio_subtype == VIO_SUBTYPE_NACK) { 5003 /* 5004 * Update the I/O statistics to indicate that an error ocurred. 5005 * No need to update the wait/run queues, this will be done by 5006 * the thread calling this function. 5007 */ 5008 VD_UPDATE_ERR_STATS(vdcp, vd_softerrs); 5009 VDC_DUMP_DRING_MSG(dring_msg); 5010 DMSG(vdcp, 0, "[%d] DATA NACK\n", vdcp->instance); 5011 mutex_exit(&vdcp->lock); 5012 return (EIO); 5013 5014 } else if (msg->tag.vio_subtype == VIO_SUBTYPE_INFO) { 5015 /* 5016 * Update the I/O statistics to indicate that an error occurred. 5017 * No need to update the wait/run queues as no specific read or 5018 * write request is being completed in response to this 'msg'. 5019 */ 5020 VD_UPDATE_ERR_STATS(vdcp, vd_protoerrs); 5021 mutex_exit(&vdcp->lock); 5022 return (EPROTO); 5023 } 5024 5025 DMSG(vdcp, 1, ": start %d end %d\n", start, end); 5026 ASSERT(start == end); 5027 5028 ldep = &vdcp->local_dring[idx]; 5029 5030 DMSG(vdcp, 1, ": state 0x%x\n", ldep->dep->hdr.dstate); 5031 5032 if (ldep->dep->hdr.dstate == VIO_DESC_DONE) { 5033 struct buf *bufp; 5034 5035 status = ldep->dep->payload.status; 5036 5037 bufp = ldep->buf; 5038 ASSERT(bufp != NULL); 5039 5040 bufp->b_resid = bufp->b_bcount - ldep->dep->payload.nbytes; 5041 bioerror(bufp, status); 5042 5043 if (status != 0) { 5044 DMSG(vdcp, 1, "I/O status=%d\n", status); 5045 } 5046 5047 DMSG(vdcp, 1, 5048 "I/O complete req=%ld bytes resp=%ld bytes\n", 5049 bufp->b_bcount, ldep->dep->payload.nbytes); 5050 5051 /* 5052 * If the request has failed and we have multiple servers or 5053 * failfast is enabled then we will have to defer the completion 5054 * of the request until we have checked that the vdisk backend 5055 * is effectively available (if multiple server) or that there 5056 * is no reservation conflict (if failfast). 5057 */ 5058 if (status != 0 && 5059 ((vdcp->num_servers > 1 && 5060 (ldep->flags & VDC_OP_ERRCHK_BACKEND)) || 5061 (vdcp->failfast_interval != 0 && 5062 (ldep->flags & VDC_OP_ERRCHK_CONFLICT)))) { 5063 /* 5064 * The I/O has failed and we need to check the error. 5065 */ 5066 (void) vdc_eio_queue(vdcp, idx); 5067 } else { 5068 op = ldep->operation; 5069 if (op == VD_OP_BREAD || op == VD_OP_BWRITE) { 5070 if (status == 0) { 5071 VD_UPDATE_IO_STATS(vdcp, op, 5072 ldep->dep->payload.nbytes); 5073 } else { 5074 VD_UPDATE_ERR_STATS(vdcp, vd_softerrs); 5075 } 5076 VD_KSTAT_RUNQ_EXIT(vdcp); 5077 DTRACE_IO1(done, buf_t *, bufp); 5078 } 5079 (void) vdc_depopulate_descriptor(vdcp, idx); 5080 biodone(bufp); 5081 } 5082 } 5083 5084 /* let the arrival signal propogate */ 5085 mutex_exit(&vdcp->lock); 5086 5087 /* probe gives the count of how many entries were processed */ 5088 DTRACE_PROBE2(processed, int, 1, vdc_t *, vdcp); 5089 5090 return (0); 5091 } 5092 5093 5094 /* 5095 * Function: 5096 * vdc_handle_ver_msg() 5097 * 5098 * Description: 5099 * 5100 * Arguments: 5101 * vdc - soft state pointer for this instance of the device driver. 5102 * ver_msg - LDC message sent by vDisk server 5103 * 5104 * Return Code: 5105 * 0 - Success 5106 */ 5107 static int 5108 vdc_handle_ver_msg(vdc_t *vdc, vio_ver_msg_t *ver_msg) 5109 { 5110 int status = 0; 5111 5112 ASSERT(vdc != NULL); 5113 ASSERT(mutex_owned(&vdc->lock)); 5114 5115 if (ver_msg->tag.vio_subtype_env != VIO_VER_INFO) { 5116 return (EPROTO); 5117 } 5118 5119 if (ver_msg->dev_class != VDEV_DISK_SERVER) { 5120 return (EINVAL); 5121 } 5122 5123 switch (ver_msg->tag.vio_subtype) { 5124 case VIO_SUBTYPE_ACK: 5125 /* 5126 * We check to see if the version returned is indeed supported 5127 * (The server may have also adjusted the minor number downwards 5128 * and if so 'ver_msg' will contain the actual version agreed) 5129 */ 5130 if (vdc_is_supported_version(ver_msg)) { 5131 vdc->ver.major = ver_msg->ver_major; 5132 vdc->ver.minor = ver_msg->ver_minor; 5133 ASSERT(vdc->ver.major > 0); 5134 } else { 5135 status = EPROTO; 5136 } 5137 break; 5138 5139 case VIO_SUBTYPE_NACK: 5140 /* 5141 * call vdc_is_supported_version() which will return the next 5142 * supported version (if any) in 'ver_msg' 5143 */ 5144 (void) vdc_is_supported_version(ver_msg); 5145 if (ver_msg->ver_major > 0) { 5146 size_t len = sizeof (*ver_msg); 5147 5148 ASSERT(vdc->ver.major > 0); 5149 5150 /* reset the necessary fields and resend */ 5151 ver_msg->tag.vio_subtype = VIO_SUBTYPE_INFO; 5152 ver_msg->dev_class = VDEV_DISK; 5153 5154 status = vdc_send(vdc, (caddr_t)ver_msg, &len); 5155 DMSG(vdc, 0, "[%d] Resend VER info (LDC status = %d)\n", 5156 vdc->instance, status); 5157 if (len != sizeof (*ver_msg)) 5158 status = EBADMSG; 5159 } else { 5160 DMSG(vdc, 0, "[%d] No common version with vDisk server", 5161 vdc->instance); 5162 status = ENOTSUP; 5163 } 5164 5165 break; 5166 case VIO_SUBTYPE_INFO: 5167 /* 5168 * Handle the case where vds starts handshake 5169 * (for now only vdc is the instigator) 5170 */ 5171 status = ENOTSUP; 5172 break; 5173 5174 default: 5175 status = EINVAL; 5176 break; 5177 } 5178 5179 return (status); 5180 } 5181 5182 /* 5183 * Function: 5184 * vdc_handle_attr_msg() 5185 * 5186 * Description: 5187 * 5188 * Arguments: 5189 * vdc - soft state pointer for this instance of the device driver. 5190 * attr_msg - LDC message sent by vDisk server 5191 * 5192 * Return Code: 5193 * 0 - Success 5194 */ 5195 static int 5196 vdc_handle_attr_msg(vdc_t *vdc, vd_attr_msg_t *attr_msg) 5197 { 5198 int status = 0; 5199 vd_disk_type_t old_type; 5200 5201 ASSERT(vdc != NULL); 5202 ASSERT(mutex_owned(&vdc->lock)); 5203 5204 if (attr_msg->tag.vio_subtype_env != VIO_ATTR_INFO) { 5205 return (EPROTO); 5206 } 5207 5208 switch (attr_msg->tag.vio_subtype) { 5209 case VIO_SUBTYPE_ACK: 5210 /* 5211 * We now verify the attributes sent by vds. 5212 */ 5213 if (attr_msg->vdisk_size == 0) { 5214 DMSG(vdc, 0, "[%d] Invalid disk size from vds", 5215 vdc->instance); 5216 status = EINVAL; 5217 break; 5218 } 5219 5220 if (attr_msg->max_xfer_sz == 0) { 5221 DMSG(vdc, 0, "[%d] Invalid transfer size from vds", 5222 vdc->instance); 5223 status = EINVAL; 5224 break; 5225 } 5226 5227 if (attr_msg->vdisk_size == VD_SIZE_UNKNOWN) { 5228 DMSG(vdc, 0, "[%d] Unknown disk size from vds", 5229 vdc->instance); 5230 attr_msg->vdisk_size = 0; 5231 } 5232 5233 /* update the VIO block size */ 5234 if (attr_msg->vdisk_block_size > 0 && 5235 vdc_update_vio_bsize(vdc, 5236 attr_msg->vdisk_block_size) != 0) { 5237 DMSG(vdc, 0, "[%d] Invalid block size (%u) from vds", 5238 vdc->instance, attr_msg->vdisk_block_size); 5239 status = EINVAL; 5240 break; 5241 } 5242 5243 /* update disk, block and transfer sizes */ 5244 old_type = vdc->vdisk_type; 5245 vdc_update_size(vdc, attr_msg->vdisk_size, 5246 attr_msg->vdisk_block_size, attr_msg->max_xfer_sz); 5247 vdc->vdisk_type = attr_msg->vdisk_type; 5248 vdc->operations = attr_msg->operations; 5249 if (vio_ver_is_supported(vdc->ver, 1, 1)) 5250 vdc->vdisk_media = attr_msg->vdisk_media; 5251 else 5252 vdc->vdisk_media = 0; 5253 5254 DMSG(vdc, 0, "[%d] max_xfer_sz: sent %lx acked %lx\n", 5255 vdc->instance, vdc->max_xfer_sz, attr_msg->max_xfer_sz); 5256 DMSG(vdc, 0, "[%d] vdisk_block_size: sent %lx acked %x\n", 5257 vdc->instance, vdc->vdisk_bsize, 5258 attr_msg->vdisk_block_size); 5259 5260 if ((attr_msg->xfer_mode != VIO_DRING_MODE_V1_0) || 5261 (attr_msg->vdisk_size > INT64_MAX) || 5262 (attr_msg->operations == 0) || 5263 (attr_msg->vdisk_type > VD_DISK_TYPE_DISK)) { 5264 DMSG(vdc, 0, "[%d] Invalid attributes from vds", 5265 vdc->instance); 5266 status = EINVAL; 5267 break; 5268 } 5269 5270 /* 5271 * Now that we have received all attributes we can create a 5272 * fake geometry for the disk. 5273 */ 5274 vdc_create_fake_geometry(vdc); 5275 5276 /* 5277 * If the disk type was previously unknown and device nodes 5278 * were created then the driver would have created 8 device 5279 * nodes. If we now find out that this is a single-slice disk 5280 * then we need to re-create the appropriate device nodes. 5281 */ 5282 if (old_type == VD_DISK_TYPE_UNK && 5283 (vdc->initialized & VDC_MINOR) && 5284 vdc->vdisk_type == VD_DISK_TYPE_SLICE) { 5285 ddi_remove_minor_node(vdc->dip, NULL); 5286 (void) devfs_clean(ddi_get_parent(vdc->dip), 5287 NULL, DV_CLEAN_FORCE); 5288 if (vdc_create_device_nodes(vdc) != 0) { 5289 DMSG(vdc, 0, "![%d] Failed to update " 5290 "device nodes", vdc->instance); 5291 } 5292 } 5293 5294 break; 5295 5296 case VIO_SUBTYPE_NACK: 5297 /* 5298 * vds could not handle the attributes we sent so we 5299 * stop negotiating. 5300 */ 5301 status = EPROTO; 5302 break; 5303 5304 case VIO_SUBTYPE_INFO: 5305 /* 5306 * Handle the case where vds starts the handshake 5307 * (for now; vdc is the only supported instigatior) 5308 */ 5309 status = ENOTSUP; 5310 break; 5311 5312 default: 5313 status = ENOTSUP; 5314 break; 5315 } 5316 5317 return (status); 5318 } 5319 5320 /* 5321 * Function: 5322 * vdc_handle_dring_reg_msg() 5323 * 5324 * Description: 5325 * 5326 * Arguments: 5327 * vdc - soft state pointer for this instance of the driver. 5328 * dring_msg - LDC message sent by vDisk server 5329 * 5330 * Return Code: 5331 * 0 - Success 5332 */ 5333 static int 5334 vdc_handle_dring_reg_msg(vdc_t *vdc, vio_dring_reg_msg_t *dring_msg) 5335 { 5336 int status = 0; 5337 5338 ASSERT(vdc != NULL); 5339 ASSERT(mutex_owned(&vdc->lock)); 5340 5341 if (dring_msg->tag.vio_subtype_env != VIO_DRING_REG) { 5342 return (EPROTO); 5343 } 5344 5345 switch (dring_msg->tag.vio_subtype) { 5346 case VIO_SUBTYPE_ACK: 5347 /* save the received dring_ident */ 5348 vdc->dring_ident = dring_msg->dring_ident; 5349 DMSG(vdc, 0, "[%d] Received dring ident=0x%lx\n", 5350 vdc->instance, vdc->dring_ident); 5351 break; 5352 5353 case VIO_SUBTYPE_NACK: 5354 /* 5355 * vds could not handle the DRing info we sent so we 5356 * stop negotiating. 5357 */ 5358 DMSG(vdc, 0, "[%d] server could not register DRing\n", 5359 vdc->instance); 5360 status = EPROTO; 5361 break; 5362 5363 case VIO_SUBTYPE_INFO: 5364 /* 5365 * Handle the case where vds starts handshake 5366 * (for now only vdc is the instigatior) 5367 */ 5368 status = ENOTSUP; 5369 break; 5370 default: 5371 status = ENOTSUP; 5372 } 5373 5374 return (status); 5375 } 5376 5377 /* 5378 * Function: 5379 * vdc_verify_seq_num() 5380 * 5381 * Description: 5382 * This functions verifies that the sequence number sent back by the vDisk 5383 * server with the latest message is what is expected (i.e. it is greater 5384 * than the last seq num sent by the vDisk server and less than or equal 5385 * to the last seq num generated by vdc). 5386 * 5387 * It then checks the request ID to see if any requests need processing 5388 * in the DRing. 5389 * 5390 * Arguments: 5391 * vdc - soft state pointer for this instance of the driver. 5392 * dring_msg - pointer to the LDC message sent by vds 5393 * 5394 * Return Code: 5395 * VDC_SEQ_NUM_TODO - Message needs to be processed 5396 * VDC_SEQ_NUM_SKIP - Message has already been processed 5397 * VDC_SEQ_NUM_INVALID - The seq numbers are so out of sync, 5398 * vdc cannot deal with them 5399 */ 5400 static int 5401 vdc_verify_seq_num(vdc_t *vdc, vio_dring_msg_t *dring_msg) 5402 { 5403 ASSERT(vdc != NULL); 5404 ASSERT(dring_msg != NULL); 5405 ASSERT(mutex_owned(&vdc->lock)); 5406 5407 /* 5408 * Check to see if the messages were responded to in the correct 5409 * order by vds. 5410 */ 5411 if ((dring_msg->seq_num <= vdc->seq_num_reply) || 5412 (dring_msg->seq_num > vdc->seq_num)) { 5413 DMSG(vdc, 0, "?[%d] Bogus sequence_number %lu: " 5414 "%lu > expected <= %lu (last proc req %lu sent %lu)\n", 5415 vdc->instance, dring_msg->seq_num, 5416 vdc->seq_num_reply, vdc->seq_num, 5417 vdc->req_id_proc, vdc->req_id); 5418 return (VDC_SEQ_NUM_INVALID); 5419 } 5420 vdc->seq_num_reply = dring_msg->seq_num; 5421 5422 if (vdc->req_id_proc < vdc->req_id) 5423 return (VDC_SEQ_NUM_TODO); 5424 else 5425 return (VDC_SEQ_NUM_SKIP); 5426 } 5427 5428 5429 /* 5430 * Function: 5431 * vdc_is_supported_version() 5432 * 5433 * Description: 5434 * This routine checks if the major/minor version numbers specified in 5435 * 'ver_msg' are supported. If not it finds the next version that is 5436 * in the supported version list 'vdc_version[]' and sets the fields in 5437 * 'ver_msg' to those values 5438 * 5439 * Arguments: 5440 * ver_msg - LDC message sent by vDisk server 5441 * 5442 * Return Code: 5443 * B_TRUE - Success 5444 * B_FALSE - Version not supported 5445 */ 5446 static boolean_t 5447 vdc_is_supported_version(vio_ver_msg_t *ver_msg) 5448 { 5449 int vdc_num_versions = sizeof (vdc_version) / sizeof (vdc_version[0]); 5450 5451 for (int i = 0; i < vdc_num_versions; i++) { 5452 ASSERT(vdc_version[i].major > 0); 5453 ASSERT((i == 0) || 5454 (vdc_version[i].major < vdc_version[i-1].major)); 5455 5456 /* 5457 * If the major versions match, adjust the minor version, if 5458 * necessary, down to the highest value supported by this 5459 * client. The server should support all minor versions lower 5460 * than the value it sent 5461 */ 5462 if (ver_msg->ver_major == vdc_version[i].major) { 5463 if (ver_msg->ver_minor > vdc_version[i].minor) { 5464 DMSGX(0, 5465 "Adjusting minor version from %u to %u", 5466 ver_msg->ver_minor, vdc_version[i].minor); 5467 ver_msg->ver_minor = vdc_version[i].minor; 5468 } 5469 return (B_TRUE); 5470 } 5471 5472 /* 5473 * If the message contains a higher major version number, set 5474 * the message's major/minor versions to the current values 5475 * and return false, so this message will get resent with 5476 * these values, and the server will potentially try again 5477 * with the same or a lower version 5478 */ 5479 if (ver_msg->ver_major > vdc_version[i].major) { 5480 ver_msg->ver_major = vdc_version[i].major; 5481 ver_msg->ver_minor = vdc_version[i].minor; 5482 DMSGX(0, "Suggesting major/minor (0x%x/0x%x)\n", 5483 ver_msg->ver_major, ver_msg->ver_minor); 5484 5485 return (B_FALSE); 5486 } 5487 5488 /* 5489 * Otherwise, the message's major version is less than the 5490 * current major version, so continue the loop to the next 5491 * (lower) supported version 5492 */ 5493 } 5494 5495 /* 5496 * No common version was found; "ground" the version pair in the 5497 * message to terminate negotiation 5498 */ 5499 ver_msg->ver_major = 0; 5500 ver_msg->ver_minor = 0; 5501 5502 return (B_FALSE); 5503 } 5504 /* -------------------------------------------------------------------------- */ 5505 5506 /* 5507 * DKIO(7) support 5508 */ 5509 5510 typedef struct vdc_dk_arg { 5511 struct dk_callback dkc; 5512 int mode; 5513 dev_t dev; 5514 vdc_t *vdc; 5515 } vdc_dk_arg_t; 5516 5517 /* 5518 * Function: 5519 * vdc_dkio_flush_cb() 5520 * 5521 * Description: 5522 * This routine is a callback for DKIOCFLUSHWRITECACHE which can be called 5523 * by kernel code. 5524 * 5525 * Arguments: 5526 * arg - a pointer to a vdc_dk_arg_t structure. 5527 */ 5528 void 5529 vdc_dkio_flush_cb(void *arg) 5530 { 5531 struct vdc_dk_arg *dk_arg = (struct vdc_dk_arg *)arg; 5532 struct dk_callback *dkc = NULL; 5533 vdc_t *vdc = NULL; 5534 int rv; 5535 5536 if (dk_arg == NULL) { 5537 cmn_err(CE_NOTE, "?[Unk] DKIOCFLUSHWRITECACHE arg is NULL\n"); 5538 return; 5539 } 5540 dkc = &dk_arg->dkc; 5541 vdc = dk_arg->vdc; 5542 ASSERT(vdc != NULL); 5543 5544 rv = vdc_do_sync_op(vdc, VD_OP_FLUSH, NULL, 0, 5545 VDCPART(dk_arg->dev), 0, VIO_both_dir, B_TRUE); 5546 if (rv != 0) { 5547 DMSG(vdc, 0, "[%d] DKIOCFLUSHWRITECACHE failed %d : model %x\n", 5548 vdc->instance, rv, 5549 ddi_model_convert_from(dk_arg->mode & FMODELS)); 5550 } 5551 5552 /* 5553 * Trigger the call back to notify the caller the the ioctl call has 5554 * been completed. 5555 */ 5556 if ((dk_arg->mode & FKIOCTL) && 5557 (dkc != NULL) && 5558 (dkc->dkc_callback != NULL)) { 5559 ASSERT(dkc->dkc_cookie != NULL); 5560 (*dkc->dkc_callback)(dkc->dkc_cookie, rv); 5561 } 5562 5563 /* Indicate that one less DKIO write flush is outstanding */ 5564 mutex_enter(&vdc->lock); 5565 vdc->dkio_flush_pending--; 5566 ASSERT(vdc->dkio_flush_pending >= 0); 5567 mutex_exit(&vdc->lock); 5568 5569 /* free the mem that was allocated when the callback was dispatched */ 5570 kmem_free(arg, sizeof (vdc_dk_arg_t)); 5571 } 5572 5573 /* 5574 * Function: 5575 * vdc_dkio_gapart() 5576 * 5577 * Description: 5578 * This function implements the DKIOCGAPART ioctl. 5579 * 5580 * Arguments: 5581 * vdc - soft state pointer 5582 * arg - a pointer to a dk_map[NDKMAP] or dk_map32[NDKMAP] structure 5583 * flag - ioctl flags 5584 */ 5585 static int 5586 vdc_dkio_gapart(vdc_t *vdc, caddr_t arg, int flag) 5587 { 5588 struct dk_geom *geom; 5589 struct extvtoc *vtoc; 5590 union { 5591 struct dk_map map[NDKMAP]; 5592 struct dk_map32 map32[NDKMAP]; 5593 } data; 5594 int i, rv, size; 5595 5596 mutex_enter(&vdc->lock); 5597 5598 if ((rv = vdc_validate_geometry(vdc)) != 0) { 5599 mutex_exit(&vdc->lock); 5600 return (rv); 5601 } 5602 5603 if (vdc->vdisk_size > VD_OLDVTOC_LIMIT) { 5604 mutex_exit(&vdc->lock); 5605 return (EOVERFLOW); 5606 } 5607 5608 vtoc = vdc->vtoc; 5609 geom = vdc->geom; 5610 5611 if (ddi_model_convert_from(flag & FMODELS) == DDI_MODEL_ILP32) { 5612 5613 for (i = 0; i < vtoc->v_nparts; i++) { 5614 data.map32[i].dkl_cylno = vtoc->v_part[i].p_start / 5615 (geom->dkg_nhead * geom->dkg_nsect); 5616 data.map32[i].dkl_nblk = vtoc->v_part[i].p_size; 5617 } 5618 size = NDKMAP * sizeof (struct dk_map32); 5619 5620 } else { 5621 5622 for (i = 0; i < vtoc->v_nparts; i++) { 5623 data.map[i].dkl_cylno = vtoc->v_part[i].p_start / 5624 (geom->dkg_nhead * geom->dkg_nsect); 5625 data.map[i].dkl_nblk = vtoc->v_part[i].p_size; 5626 } 5627 size = NDKMAP * sizeof (struct dk_map); 5628 5629 } 5630 5631 mutex_exit(&vdc->lock); 5632 5633 if (ddi_copyout(&data, arg, size, flag) != 0) 5634 return (EFAULT); 5635 5636 return (0); 5637 } 5638 5639 /* 5640 * Function: 5641 * vdc_dkio_partition() 5642 * 5643 * Description: 5644 * This function implements the DKIOCPARTITION ioctl. 5645 * 5646 * Arguments: 5647 * vdc - soft state pointer 5648 * arg - a pointer to a struct partition64 structure 5649 * flag - ioctl flags 5650 */ 5651 static int 5652 vdc_dkio_partition(vdc_t *vdc, caddr_t arg, int flag) 5653 { 5654 struct partition64 p64; 5655 efi_gpt_t *gpt; 5656 efi_gpe_t *gpe; 5657 vd_efi_dev_t edev; 5658 uint_t partno; 5659 int rv; 5660 5661 if (ddi_copyin(arg, &p64, sizeof (struct partition64), flag)) { 5662 return (EFAULT); 5663 } 5664 5665 VDC_EFI_DEV_SET(edev, vdc, vd_process_efi_ioctl); 5666 5667 if ((rv = vd_efi_alloc_and_read(&edev, &gpt, &gpe)) != 0) { 5668 return (rv); 5669 } 5670 5671 partno = p64.p_partno; 5672 5673 if (partno >= gpt->efi_gpt_NumberOfPartitionEntries) { 5674 vd_efi_free(&edev, gpt, gpe); 5675 return (ESRCH); 5676 } 5677 5678 bcopy(&gpe[partno].efi_gpe_PartitionTypeGUID, &p64.p_type, 5679 sizeof (struct uuid)); 5680 p64.p_start = gpe[partno].efi_gpe_StartingLBA; 5681 p64.p_size = gpe[partno].efi_gpe_EndingLBA - p64.p_start + 1; 5682 5683 if (ddi_copyout(&p64, arg, sizeof (struct partition64), flag)) { 5684 vd_efi_free(&edev, gpt, gpe); 5685 return (EFAULT); 5686 } 5687 5688 vd_efi_free(&edev, gpt, gpe); 5689 return (0); 5690 } 5691 5692 /* 5693 * Function: 5694 * vdc_dioctl_rwcmd() 5695 * 5696 * Description: 5697 * This function implements the DIOCTL_RWCMD ioctl. This ioctl is used 5698 * for DKC_DIRECT disks to read or write at an absolute disk offset. 5699 * 5700 * Arguments: 5701 * dev - device 5702 * arg - a pointer to a dadkio_rwcmd or dadkio_rwcmd32 structure 5703 * flag - ioctl flags 5704 */ 5705 static int 5706 vdc_dioctl_rwcmd(vdc_t *vdc, caddr_t arg, int flag) 5707 { 5708 struct dadkio_rwcmd32 rwcmd32; 5709 struct dadkio_rwcmd rwcmd; 5710 struct iovec aiov; 5711 struct uio auio; 5712 int rw, status; 5713 struct buf *buf; 5714 5715 if (ddi_model_convert_from(flag & FMODELS) == DDI_MODEL_ILP32) { 5716 if (ddi_copyin((caddr_t)arg, (caddr_t)&rwcmd32, 5717 sizeof (struct dadkio_rwcmd32), flag)) { 5718 return (EFAULT); 5719 } 5720 rwcmd.cmd = rwcmd32.cmd; 5721 rwcmd.flags = rwcmd32.flags; 5722 rwcmd.blkaddr = (daddr_t)rwcmd32.blkaddr; 5723 rwcmd.buflen = rwcmd32.buflen; 5724 rwcmd.bufaddr = (caddr_t)(uintptr_t)rwcmd32.bufaddr; 5725 } else { 5726 if (ddi_copyin((caddr_t)arg, (caddr_t)&rwcmd, 5727 sizeof (struct dadkio_rwcmd), flag)) { 5728 return (EFAULT); 5729 } 5730 } 5731 5732 switch (rwcmd.cmd) { 5733 case DADKIO_RWCMD_READ: 5734 rw = B_READ; 5735 break; 5736 case DADKIO_RWCMD_WRITE: 5737 rw = B_WRITE; 5738 break; 5739 default: 5740 return (EINVAL); 5741 } 5742 5743 bzero((caddr_t)&aiov, sizeof (struct iovec)); 5744 aiov.iov_base = rwcmd.bufaddr; 5745 aiov.iov_len = rwcmd.buflen; 5746 5747 bzero((caddr_t)&auio, sizeof (struct uio)); 5748 auio.uio_iov = &aiov; 5749 auio.uio_iovcnt = 1; 5750 auio.uio_loffset = rwcmd.blkaddr * vdc->vdisk_bsize; 5751 auio.uio_resid = rwcmd.buflen; 5752 auio.uio_segflg = flag & FKIOCTL ? UIO_SYSSPACE : UIO_USERSPACE; 5753 5754 buf = kmem_alloc(sizeof (buf_t), KM_SLEEP); 5755 bioinit(buf); 5756 /* 5757 * We use the private field of buf to specify that this is an 5758 * I/O using an absolute offset. 5759 */ 5760 buf->b_private = (void *)VD_SLICE_NONE; 5761 5762 status = physio(vdc_strategy, buf, VD_MAKE_DEV(vdc->instance, 0), 5763 rw, vdc_min, &auio); 5764 5765 biofini(buf); 5766 kmem_free(buf, sizeof (buf_t)); 5767 5768 return (status); 5769 } 5770 5771 /* 5772 * Allocate a buffer for a VD_OP_SCSICMD operation. The size of the allocated 5773 * buffer is returned in alloc_len. 5774 */ 5775 static vd_scsi_t * 5776 vdc_scsi_alloc(int cdb_len, int sense_len, int datain_len, int dataout_len, 5777 int *alloc_len) 5778 { 5779 vd_scsi_t *vd_scsi; 5780 int vd_scsi_len = VD_SCSI_SIZE; 5781 5782 vd_scsi_len += P2ROUNDUP(cdb_len, sizeof (uint64_t)); 5783 vd_scsi_len += P2ROUNDUP(sense_len, sizeof (uint64_t)); 5784 vd_scsi_len += P2ROUNDUP(datain_len, sizeof (uint64_t)); 5785 vd_scsi_len += P2ROUNDUP(dataout_len, sizeof (uint64_t)); 5786 5787 ASSERT(vd_scsi_len % sizeof (uint64_t) == 0); 5788 5789 vd_scsi = kmem_zalloc(vd_scsi_len, KM_SLEEP); 5790 5791 vd_scsi->cdb_len = cdb_len; 5792 vd_scsi->sense_len = sense_len; 5793 vd_scsi->datain_len = datain_len; 5794 vd_scsi->dataout_len = dataout_len; 5795 5796 *alloc_len = vd_scsi_len; 5797 5798 return (vd_scsi); 5799 } 5800 5801 /* 5802 * Convert the status of a SCSI command to a Solaris return code. 5803 * 5804 * Arguments: 5805 * vd_scsi - The SCSI operation buffer. 5806 * log_error - indicate if an error message should be logged. 5807 * 5808 * Note that our SCSI error messages are rather primitive for the moment 5809 * and could be improved by decoding some data like the SCSI command and 5810 * the sense key. 5811 * 5812 * Return value: 5813 * 0 - Status is good. 5814 * EACCES - Status reports a reservation conflict. 5815 * ENOTSUP - Status reports a check condition and sense key 5816 * reports an illegal request. 5817 * EIO - Any other status. 5818 */ 5819 static int 5820 vdc_scsi_status(vdc_t *vdc, vd_scsi_t *vd_scsi, boolean_t log_error) 5821 { 5822 int rv; 5823 char path_str[MAXPATHLEN]; 5824 char panic_str[VDC_RESV_CONFLICT_FMT_LEN + MAXPATHLEN]; 5825 union scsi_cdb *cdb; 5826 struct scsi_extended_sense *sense; 5827 5828 if (vd_scsi->cmd_status == STATUS_GOOD) 5829 /* no error */ 5830 return (0); 5831 5832 /* when the tunable vdc_scsi_log_error is true we log all errors */ 5833 if (vdc_scsi_log_error) 5834 log_error = B_TRUE; 5835 5836 if (log_error) { 5837 cmn_err(CE_WARN, "%s (vdc%d):\tError for Command: 0x%x)\n", 5838 ddi_pathname(vdc->dip, path_str), vdc->instance, 5839 GETCMD(VD_SCSI_DATA_CDB(vd_scsi))); 5840 } 5841 5842 /* default returned value */ 5843 rv = EIO; 5844 5845 switch (vd_scsi->cmd_status) { 5846 5847 case STATUS_CHECK: 5848 case STATUS_TERMINATED: 5849 if (log_error) 5850 cmn_err(CE_CONT, "\tCheck Condition Error\n"); 5851 5852 /* check sense buffer */ 5853 if (vd_scsi->sense_len == 0 || 5854 vd_scsi->sense_status != STATUS_GOOD) { 5855 if (log_error) 5856 cmn_err(CE_CONT, "\tNo Sense Data Available\n"); 5857 break; 5858 } 5859 5860 sense = VD_SCSI_DATA_SENSE(vd_scsi); 5861 5862 if (log_error) { 5863 cmn_err(CE_CONT, "\tSense Key: 0x%x\n" 5864 "\tASC: 0x%x, ASCQ: 0x%x\n", 5865 scsi_sense_key((uint8_t *)sense), 5866 scsi_sense_asc((uint8_t *)sense), 5867 scsi_sense_ascq((uint8_t *)sense)); 5868 } 5869 5870 if (scsi_sense_key((uint8_t *)sense) == KEY_ILLEGAL_REQUEST) 5871 rv = ENOTSUP; 5872 break; 5873 5874 case STATUS_BUSY: 5875 if (log_error) 5876 cmn_err(CE_NOTE, "\tDevice Busy\n"); 5877 break; 5878 5879 case STATUS_RESERVATION_CONFLICT: 5880 /* 5881 * If the command was PERSISTENT_RESERVATION_[IN|OUT] then 5882 * reservation conflict could be due to various reasons like 5883 * incorrect keys, not registered or not reserved etc. So, 5884 * we should not panic in that case. 5885 */ 5886 cdb = VD_SCSI_DATA_CDB(vd_scsi); 5887 if (vdc->failfast_interval != 0 && 5888 cdb->scc_cmd != SCMD_PERSISTENT_RESERVE_IN && 5889 cdb->scc_cmd != SCMD_PERSISTENT_RESERVE_OUT) { 5890 /* failfast is enabled so we have to panic */ 5891 (void) snprintf(panic_str, sizeof (panic_str), 5892 VDC_RESV_CONFLICT_FMT_STR "%s", 5893 ddi_pathname(vdc->dip, path_str)); 5894 panic(panic_str); 5895 } 5896 if (log_error) 5897 cmn_err(CE_NOTE, "\tReservation Conflict\n"); 5898 rv = EACCES; 5899 break; 5900 5901 case STATUS_QFULL: 5902 if (log_error) 5903 cmn_err(CE_NOTE, "\tQueue Full\n"); 5904 break; 5905 5906 case STATUS_MET: 5907 case STATUS_INTERMEDIATE: 5908 case STATUS_SCSI2: 5909 case STATUS_INTERMEDIATE_MET: 5910 case STATUS_ACA_ACTIVE: 5911 if (log_error) 5912 cmn_err(CE_CONT, 5913 "\tUnexpected SCSI status received: 0x%x\n", 5914 vd_scsi->cmd_status); 5915 break; 5916 5917 default: 5918 if (log_error) 5919 cmn_err(CE_CONT, 5920 "\tInvalid SCSI status received: 0x%x\n", 5921 vd_scsi->cmd_status); 5922 break; 5923 } 5924 5925 return (rv); 5926 } 5927 5928 /* 5929 * Implemented the USCSICMD uscsi(7I) ioctl. This ioctl is converted to 5930 * a VD_OP_SCSICMD operation which is sent to the vdisk server. If a SCSI 5931 * reset is requested (i.e. a flag USCSI_RESET* is set) then the ioctl is 5932 * converted to a VD_OP_RESET operation. 5933 */ 5934 static int 5935 vdc_uscsi_cmd(vdc_t *vdc, caddr_t arg, int mode) 5936 { 5937 struct uscsi_cmd uscsi; 5938 struct uscsi_cmd32 uscsi32; 5939 vd_scsi_t *vd_scsi; 5940 int vd_scsi_len; 5941 union scsi_cdb *cdb; 5942 struct scsi_extended_sense *sense; 5943 char *datain, *dataout; 5944 size_t cdb_len, datain_len, dataout_len, sense_len; 5945 int rv; 5946 5947 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 5948 if (ddi_copyin(arg, &uscsi32, sizeof (struct uscsi_cmd32), 5949 mode) != 0) 5950 return (EFAULT); 5951 uscsi_cmd32touscsi_cmd((&uscsi32), (&uscsi)); 5952 } else { 5953 if (ddi_copyin(arg, &uscsi, sizeof (struct uscsi_cmd), 5954 mode) != 0) 5955 return (EFAULT); 5956 } 5957 5958 /* a uscsi reset is converted to a VD_OP_RESET operation */ 5959 if (uscsi.uscsi_flags & (USCSI_RESET | USCSI_RESET_LUN | 5960 USCSI_RESET_ALL)) { 5961 rv = vdc_do_sync_op(vdc, VD_OP_RESET, NULL, 0, 0, 0, 5962 VIO_both_dir, B_TRUE); 5963 return (rv); 5964 } 5965 5966 /* cdb buffer length */ 5967 cdb_len = uscsi.uscsi_cdblen; 5968 5969 /* data in and out buffers length */ 5970 if (uscsi.uscsi_flags & USCSI_READ) { 5971 datain_len = uscsi.uscsi_buflen; 5972 dataout_len = 0; 5973 } else { 5974 datain_len = 0; 5975 dataout_len = uscsi.uscsi_buflen; 5976 } 5977 5978 /* sense buffer length */ 5979 if (uscsi.uscsi_flags & USCSI_RQENABLE) 5980 sense_len = uscsi.uscsi_rqlen; 5981 else 5982 sense_len = 0; 5983 5984 /* allocate buffer for the VD_SCSICMD_OP operation */ 5985 vd_scsi = vdc_scsi_alloc(cdb_len, sense_len, datain_len, dataout_len, 5986 &vd_scsi_len); 5987 5988 /* 5989 * The documentation of USCSI_ISOLATE and USCSI_DIAGNOSE is very vague, 5990 * but basically they prevent a SCSI command from being retried in case 5991 * of an error. 5992 */ 5993 if ((uscsi.uscsi_flags & USCSI_ISOLATE) || 5994 (uscsi.uscsi_flags & USCSI_DIAGNOSE)) 5995 vd_scsi->options |= VD_SCSI_OPT_NORETRY; 5996 5997 /* set task attribute */ 5998 if (uscsi.uscsi_flags & USCSI_NOTAG) { 5999 vd_scsi->task_attribute = 0; 6000 } else { 6001 if (uscsi.uscsi_flags & USCSI_HEAD) 6002 vd_scsi->task_attribute = VD_SCSI_TASK_ACA; 6003 else if (uscsi.uscsi_flags & USCSI_HTAG) 6004 vd_scsi->task_attribute = VD_SCSI_TASK_HQUEUE; 6005 else if (uscsi.uscsi_flags & USCSI_OTAG) 6006 vd_scsi->task_attribute = VD_SCSI_TASK_ORDERED; 6007 else 6008 vd_scsi->task_attribute = 0; 6009 } 6010 6011 /* set timeout */ 6012 vd_scsi->timeout = uscsi.uscsi_timeout; 6013 6014 /* copy-in cdb data */ 6015 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6016 if (ddi_copyin(uscsi.uscsi_cdb, cdb, cdb_len, mode) != 0) { 6017 rv = EFAULT; 6018 goto done; 6019 } 6020 6021 /* keep a pointer to the sense buffer */ 6022 sense = VD_SCSI_DATA_SENSE(vd_scsi); 6023 6024 /* keep a pointer to the data-in buffer */ 6025 datain = (char *)VD_SCSI_DATA_IN(vd_scsi); 6026 6027 /* copy-in request data to the data-out buffer */ 6028 dataout = (char *)VD_SCSI_DATA_OUT(vd_scsi); 6029 if (!(uscsi.uscsi_flags & USCSI_READ)) { 6030 if (ddi_copyin(uscsi.uscsi_bufaddr, dataout, dataout_len, 6031 mode)) { 6032 rv = EFAULT; 6033 goto done; 6034 } 6035 } 6036 6037 /* submit the request */ 6038 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6039 0, 0, VIO_both_dir, B_FALSE); 6040 6041 if (rv != 0) 6042 goto done; 6043 6044 /* update scsi status */ 6045 uscsi.uscsi_status = vd_scsi->cmd_status; 6046 6047 /* update sense data */ 6048 if ((uscsi.uscsi_flags & USCSI_RQENABLE) && 6049 (uscsi.uscsi_status == STATUS_CHECK || 6050 uscsi.uscsi_status == STATUS_TERMINATED)) { 6051 6052 uscsi.uscsi_rqstatus = vd_scsi->sense_status; 6053 6054 if (uscsi.uscsi_rqstatus == STATUS_GOOD) { 6055 uscsi.uscsi_rqresid = uscsi.uscsi_rqlen - 6056 vd_scsi->sense_len; 6057 if (ddi_copyout(sense, uscsi.uscsi_rqbuf, 6058 vd_scsi->sense_len, mode) != 0) { 6059 rv = EFAULT; 6060 goto done; 6061 } 6062 } 6063 } 6064 6065 /* update request data */ 6066 if (uscsi.uscsi_status == STATUS_GOOD) { 6067 if (uscsi.uscsi_flags & USCSI_READ) { 6068 uscsi.uscsi_resid = uscsi.uscsi_buflen - 6069 vd_scsi->datain_len; 6070 if (ddi_copyout(datain, uscsi.uscsi_bufaddr, 6071 vd_scsi->datain_len, mode) != 0) { 6072 rv = EFAULT; 6073 goto done; 6074 } 6075 } else { 6076 uscsi.uscsi_resid = uscsi.uscsi_buflen - 6077 vd_scsi->dataout_len; 6078 } 6079 } 6080 6081 /* copy-out result */ 6082 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 6083 uscsi_cmdtouscsi_cmd32((&uscsi), (&uscsi32)); 6084 if (ddi_copyout(&uscsi32, arg, sizeof (struct uscsi_cmd32), 6085 mode) != 0) { 6086 rv = EFAULT; 6087 goto done; 6088 } 6089 } else { 6090 if (ddi_copyout(&uscsi, arg, sizeof (struct uscsi_cmd), 6091 mode) != 0) { 6092 rv = EFAULT; 6093 goto done; 6094 } 6095 } 6096 6097 /* get the return code from the SCSI command status */ 6098 rv = vdc_scsi_status(vdc, vd_scsi, 6099 !(uscsi.uscsi_flags & USCSI_SILENT)); 6100 6101 done: 6102 kmem_free(vd_scsi, vd_scsi_len); 6103 return (rv); 6104 } 6105 6106 /* 6107 * Create a VD_OP_SCSICMD buffer for a SCSI PERSISTENT IN command. 6108 * 6109 * Arguments: 6110 * cmd - SCSI PERSISTENT IN command 6111 * len - length of the SCSI input buffer 6112 * vd_scsi_len - return the length of the allocated buffer 6113 * 6114 * Returned Value: 6115 * a pointer to the allocated VD_OP_SCSICMD buffer. 6116 */ 6117 static vd_scsi_t * 6118 vdc_scsi_alloc_persistent_in(uchar_t cmd, int len, int *vd_scsi_len) 6119 { 6120 int cdb_len, sense_len, datain_len, dataout_len; 6121 vd_scsi_t *vd_scsi; 6122 union scsi_cdb *cdb; 6123 6124 cdb_len = CDB_GROUP1; 6125 sense_len = sizeof (struct scsi_extended_sense); 6126 datain_len = len; 6127 dataout_len = 0; 6128 6129 vd_scsi = vdc_scsi_alloc(cdb_len, sense_len, datain_len, dataout_len, 6130 vd_scsi_len); 6131 6132 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6133 6134 /* set cdb */ 6135 cdb->scc_cmd = SCMD_PERSISTENT_RESERVE_IN; 6136 cdb->cdb_opaque[1] = cmd; 6137 FORMG1COUNT(cdb, datain_len); 6138 6139 vd_scsi->timeout = vdc_scsi_timeout; 6140 6141 return (vd_scsi); 6142 } 6143 6144 /* 6145 * Create a VD_OP_SCSICMD buffer for a SCSI PERSISTENT OUT command. 6146 * 6147 * Arguments: 6148 * cmd - SCSI PERSISTENT OUT command 6149 * len - length of the SCSI output buffer 6150 * vd_scsi_len - return the length of the allocated buffer 6151 * 6152 * Returned Code: 6153 * a pointer to the allocated VD_OP_SCSICMD buffer. 6154 */ 6155 static vd_scsi_t * 6156 vdc_scsi_alloc_persistent_out(uchar_t cmd, int len, int *vd_scsi_len) 6157 { 6158 int cdb_len, sense_len, datain_len, dataout_len; 6159 vd_scsi_t *vd_scsi; 6160 union scsi_cdb *cdb; 6161 6162 cdb_len = CDB_GROUP1; 6163 sense_len = sizeof (struct scsi_extended_sense); 6164 datain_len = 0; 6165 dataout_len = len; 6166 6167 vd_scsi = vdc_scsi_alloc(cdb_len, sense_len, datain_len, dataout_len, 6168 vd_scsi_len); 6169 6170 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6171 6172 /* set cdb */ 6173 cdb->scc_cmd = SCMD_PERSISTENT_RESERVE_OUT; 6174 cdb->cdb_opaque[1] = cmd; 6175 FORMG1COUNT(cdb, dataout_len); 6176 6177 vd_scsi->timeout = vdc_scsi_timeout; 6178 6179 return (vd_scsi); 6180 } 6181 6182 /* 6183 * Implement the MHIOCGRP_INKEYS mhd(7i) ioctl. The ioctl is converted 6184 * to a SCSI PERSISTENT IN READ KEYS command which is sent to the vdisk 6185 * server with a VD_OP_SCSICMD operation. 6186 */ 6187 static int 6188 vdc_mhd_inkeys(vdc_t *vdc, caddr_t arg, int mode) 6189 { 6190 vd_scsi_t *vd_scsi; 6191 mhioc_inkeys_t inkeys; 6192 mhioc_key_list_t klist; 6193 struct mhioc_inkeys32 inkeys32; 6194 struct mhioc_key_list32 klist32; 6195 sd_prin_readkeys_t *scsi_keys; 6196 void *user_keys; 6197 int vd_scsi_len; 6198 int listsize, listlen, rv; 6199 6200 /* copyin arguments */ 6201 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 6202 rv = ddi_copyin(arg, &inkeys32, sizeof (inkeys32), mode); 6203 if (rv != 0) 6204 return (EFAULT); 6205 6206 rv = ddi_copyin((caddr_t)(uintptr_t)inkeys32.li, &klist32, 6207 sizeof (klist32), mode); 6208 if (rv != 0) 6209 return (EFAULT); 6210 6211 listsize = klist32.listsize; 6212 } else { 6213 rv = ddi_copyin(arg, &inkeys, sizeof (inkeys), mode); 6214 if (rv != 0) 6215 return (EFAULT); 6216 6217 rv = ddi_copyin(inkeys.li, &klist, sizeof (klist), mode); 6218 if (rv != 0) 6219 return (EFAULT); 6220 6221 listsize = klist.listsize; 6222 } 6223 6224 /* build SCSI VD_OP request */ 6225 vd_scsi = vdc_scsi_alloc_persistent_in(SD_READ_KEYS, 6226 sizeof (sd_prin_readkeys_t) - sizeof (caddr_t) + 6227 (sizeof (mhioc_resv_key_t) * listsize), &vd_scsi_len); 6228 6229 scsi_keys = (sd_prin_readkeys_t *)VD_SCSI_DATA_IN(vd_scsi); 6230 6231 /* submit the request */ 6232 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6233 0, 0, VIO_both_dir, B_FALSE); 6234 6235 if (rv != 0) 6236 goto done; 6237 6238 listlen = scsi_keys->len / MHIOC_RESV_KEY_SIZE; 6239 6240 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 6241 inkeys32.generation = scsi_keys->generation; 6242 rv = ddi_copyout(&inkeys32, arg, sizeof (inkeys32), mode); 6243 if (rv != 0) { 6244 rv = EFAULT; 6245 goto done; 6246 } 6247 6248 klist32.listlen = listlen; 6249 rv = ddi_copyout(&klist32, (caddr_t)(uintptr_t)inkeys32.li, 6250 sizeof (klist32), mode); 6251 if (rv != 0) { 6252 rv = EFAULT; 6253 goto done; 6254 } 6255 6256 user_keys = (caddr_t)(uintptr_t)klist32.list; 6257 } else { 6258 inkeys.generation = scsi_keys->generation; 6259 rv = ddi_copyout(&inkeys, arg, sizeof (inkeys), mode); 6260 if (rv != 0) { 6261 rv = EFAULT; 6262 goto done; 6263 } 6264 6265 klist.listlen = listlen; 6266 rv = ddi_copyout(&klist, inkeys.li, sizeof (klist), mode); 6267 if (rv != 0) { 6268 rv = EFAULT; 6269 goto done; 6270 } 6271 6272 user_keys = klist.list; 6273 } 6274 6275 /* copy out keys */ 6276 if (listlen > 0 && listsize > 0) { 6277 if (listsize < listlen) 6278 listlen = listsize; 6279 rv = ddi_copyout(&scsi_keys->keylist, user_keys, 6280 listlen * MHIOC_RESV_KEY_SIZE, mode); 6281 if (rv != 0) 6282 rv = EFAULT; 6283 } 6284 6285 if (rv == 0) 6286 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6287 6288 done: 6289 kmem_free(vd_scsi, vd_scsi_len); 6290 6291 return (rv); 6292 } 6293 6294 /* 6295 * Implement the MHIOCGRP_INRESV mhd(7i) ioctl. The ioctl is converted 6296 * to a SCSI PERSISTENT IN READ RESERVATION command which is sent to 6297 * the vdisk server with a VD_OP_SCSICMD operation. 6298 */ 6299 static int 6300 vdc_mhd_inresv(vdc_t *vdc, caddr_t arg, int mode) 6301 { 6302 vd_scsi_t *vd_scsi; 6303 mhioc_inresvs_t inresv; 6304 mhioc_resv_desc_list_t rlist; 6305 struct mhioc_inresvs32 inresv32; 6306 struct mhioc_resv_desc_list32 rlist32; 6307 mhioc_resv_desc_t mhd_resv; 6308 sd_prin_readresv_t *scsi_resv; 6309 sd_readresv_desc_t *resv; 6310 mhioc_resv_desc_t *user_resv; 6311 int vd_scsi_len; 6312 int listsize, listlen, i, rv; 6313 6314 /* copyin arguments */ 6315 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 6316 rv = ddi_copyin(arg, &inresv32, sizeof (inresv32), mode); 6317 if (rv != 0) 6318 return (EFAULT); 6319 6320 rv = ddi_copyin((caddr_t)(uintptr_t)inresv32.li, &rlist32, 6321 sizeof (rlist32), mode); 6322 if (rv != 0) 6323 return (EFAULT); 6324 6325 listsize = rlist32.listsize; 6326 } else { 6327 rv = ddi_copyin(arg, &inresv, sizeof (inresv), mode); 6328 if (rv != 0) 6329 return (EFAULT); 6330 6331 rv = ddi_copyin(inresv.li, &rlist, sizeof (rlist), mode); 6332 if (rv != 0) 6333 return (EFAULT); 6334 6335 listsize = rlist.listsize; 6336 } 6337 6338 /* build SCSI VD_OP request */ 6339 vd_scsi = vdc_scsi_alloc_persistent_in(SD_READ_RESV, 6340 sizeof (sd_prin_readresv_t) - sizeof (caddr_t) + 6341 (SCSI3_RESV_DESC_LEN * listsize), &vd_scsi_len); 6342 6343 scsi_resv = (sd_prin_readresv_t *)VD_SCSI_DATA_IN(vd_scsi); 6344 6345 /* submit the request */ 6346 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6347 0, 0, VIO_both_dir, B_FALSE); 6348 6349 if (rv != 0) 6350 goto done; 6351 6352 listlen = scsi_resv->len / SCSI3_RESV_DESC_LEN; 6353 6354 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 6355 inresv32.generation = scsi_resv->generation; 6356 rv = ddi_copyout(&inresv32, arg, sizeof (inresv32), mode); 6357 if (rv != 0) { 6358 rv = EFAULT; 6359 goto done; 6360 } 6361 6362 rlist32.listlen = listlen; 6363 rv = ddi_copyout(&rlist32, (caddr_t)(uintptr_t)inresv32.li, 6364 sizeof (rlist32), mode); 6365 if (rv != 0) { 6366 rv = EFAULT; 6367 goto done; 6368 } 6369 6370 user_resv = (mhioc_resv_desc_t *)(uintptr_t)rlist32.list; 6371 } else { 6372 inresv.generation = scsi_resv->generation; 6373 rv = ddi_copyout(&inresv, arg, sizeof (inresv), mode); 6374 if (rv != 0) { 6375 rv = EFAULT; 6376 goto done; 6377 } 6378 6379 rlist.listlen = listlen; 6380 rv = ddi_copyout(&rlist, inresv.li, sizeof (rlist), mode); 6381 if (rv != 0) { 6382 rv = EFAULT; 6383 goto done; 6384 } 6385 6386 user_resv = rlist.list; 6387 } 6388 6389 /* copy out reservations */ 6390 if (listsize > 0 && listlen > 0) { 6391 if (listsize < listlen) 6392 listlen = listsize; 6393 resv = (sd_readresv_desc_t *)&scsi_resv->readresv_desc; 6394 6395 for (i = 0; i < listlen; i++) { 6396 mhd_resv.type = resv->type; 6397 mhd_resv.scope = resv->scope; 6398 mhd_resv.scope_specific_addr = 6399 BE_32(resv->scope_specific_addr); 6400 bcopy(&resv->resvkey, &mhd_resv.key, 6401 MHIOC_RESV_KEY_SIZE); 6402 6403 rv = ddi_copyout(&mhd_resv, user_resv, 6404 sizeof (mhd_resv), mode); 6405 if (rv != 0) { 6406 rv = EFAULT; 6407 goto done; 6408 } 6409 resv++; 6410 user_resv++; 6411 } 6412 } 6413 6414 if (rv == 0) 6415 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6416 6417 done: 6418 kmem_free(vd_scsi, vd_scsi_len); 6419 return (rv); 6420 } 6421 6422 /* 6423 * Implement the MHIOCGRP_REGISTER mhd(7i) ioctl. The ioctl is converted 6424 * to a SCSI PERSISTENT OUT REGISTER command which is sent to the vdisk 6425 * server with a VD_OP_SCSICMD operation. 6426 */ 6427 static int 6428 vdc_mhd_register(vdc_t *vdc, caddr_t arg, int mode) 6429 { 6430 vd_scsi_t *vd_scsi; 6431 sd_prout_t *scsi_prout; 6432 mhioc_register_t mhd_reg; 6433 int vd_scsi_len, rv; 6434 6435 /* copyin arguments */ 6436 rv = ddi_copyin(arg, &mhd_reg, sizeof (mhd_reg), mode); 6437 if (rv != 0) 6438 return (EFAULT); 6439 6440 /* build SCSI VD_OP request */ 6441 vd_scsi = vdc_scsi_alloc_persistent_out(SD_SCSI3_REGISTER, 6442 sizeof (sd_prout_t), &vd_scsi_len); 6443 6444 /* set parameters */ 6445 scsi_prout = (sd_prout_t *)VD_SCSI_DATA_OUT(vd_scsi); 6446 bcopy(mhd_reg.oldkey.key, scsi_prout->res_key, MHIOC_RESV_KEY_SIZE); 6447 bcopy(mhd_reg.newkey.key, scsi_prout->service_key, MHIOC_RESV_KEY_SIZE); 6448 scsi_prout->aptpl = (uchar_t)mhd_reg.aptpl; 6449 6450 /* submit the request */ 6451 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6452 0, 0, VIO_both_dir, B_FALSE); 6453 6454 if (rv == 0) 6455 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6456 6457 kmem_free(vd_scsi, vd_scsi_len); 6458 return (rv); 6459 } 6460 6461 /* 6462 * Implement the MHIOCGRP_RESERVE mhd(7i) ioctl. The ioctl is converted 6463 * to a SCSI PERSISTENT OUT RESERVE command which is sent to the vdisk 6464 * server with a VD_OP_SCSICMD operation. 6465 */ 6466 static int 6467 vdc_mhd_reserve(vdc_t *vdc, caddr_t arg, int mode) 6468 { 6469 union scsi_cdb *cdb; 6470 vd_scsi_t *vd_scsi; 6471 sd_prout_t *scsi_prout; 6472 mhioc_resv_desc_t mhd_resv; 6473 int vd_scsi_len, rv; 6474 6475 /* copyin arguments */ 6476 rv = ddi_copyin(arg, &mhd_resv, sizeof (mhd_resv), mode); 6477 if (rv != 0) 6478 return (EFAULT); 6479 6480 /* build SCSI VD_OP request */ 6481 vd_scsi = vdc_scsi_alloc_persistent_out(SD_SCSI3_RESERVE, 6482 sizeof (sd_prout_t), &vd_scsi_len); 6483 6484 /* set parameters */ 6485 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6486 scsi_prout = (sd_prout_t *)VD_SCSI_DATA_OUT(vd_scsi); 6487 bcopy(mhd_resv.key.key, scsi_prout->res_key, MHIOC_RESV_KEY_SIZE); 6488 scsi_prout->scope_address = mhd_resv.scope_specific_addr; 6489 cdb->cdb_opaque[2] = mhd_resv.type; 6490 6491 /* submit the request */ 6492 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6493 0, 0, VIO_both_dir, B_FALSE); 6494 6495 if (rv == 0) 6496 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6497 6498 kmem_free(vd_scsi, vd_scsi_len); 6499 return (rv); 6500 } 6501 6502 /* 6503 * Implement the MHIOCGRP_PREEMPTANDABORT mhd(7i) ioctl. The ioctl is 6504 * converted to a SCSI PERSISTENT OUT PREEMPT AND ABORT command which 6505 * is sent to the vdisk server with a VD_OP_SCSICMD operation. 6506 */ 6507 static int 6508 vdc_mhd_preemptabort(vdc_t *vdc, caddr_t arg, int mode) 6509 { 6510 union scsi_cdb *cdb; 6511 vd_scsi_t *vd_scsi; 6512 sd_prout_t *scsi_prout; 6513 mhioc_preemptandabort_t mhd_preempt; 6514 int vd_scsi_len, rv; 6515 6516 /* copyin arguments */ 6517 rv = ddi_copyin(arg, &mhd_preempt, sizeof (mhd_preempt), mode); 6518 if (rv != 0) 6519 return (EFAULT); 6520 6521 /* build SCSI VD_OP request */ 6522 vd_scsi = vdc_scsi_alloc_persistent_out(SD_SCSI3_PREEMPTANDABORT, 6523 sizeof (sd_prout_t), &vd_scsi_len); 6524 6525 /* set parameters */ 6526 vd_scsi->task_attribute = VD_SCSI_TASK_ACA; 6527 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6528 scsi_prout = (sd_prout_t *)VD_SCSI_DATA_OUT(vd_scsi); 6529 bcopy(mhd_preempt.resvdesc.key.key, scsi_prout->res_key, 6530 MHIOC_RESV_KEY_SIZE); 6531 bcopy(mhd_preempt.victim_key.key, scsi_prout->service_key, 6532 MHIOC_RESV_KEY_SIZE); 6533 scsi_prout->scope_address = mhd_preempt.resvdesc.scope_specific_addr; 6534 cdb->cdb_opaque[2] = mhd_preempt.resvdesc.type; 6535 6536 /* submit the request */ 6537 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6538 0, 0, VIO_both_dir, B_FALSE); 6539 6540 if (rv == 0) 6541 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6542 6543 kmem_free(vd_scsi, vd_scsi_len); 6544 return (rv); 6545 } 6546 6547 /* 6548 * Implement the MHIOCGRP_REGISTERANDIGNOREKEY mhd(7i) ioctl. The ioctl 6549 * is converted to a SCSI PERSISTENT OUT REGISTER AND IGNORE EXISTING KEY 6550 * command which is sent to the vdisk server with a VD_OP_SCSICMD operation. 6551 */ 6552 static int 6553 vdc_mhd_registerignore(vdc_t *vdc, caddr_t arg, int mode) 6554 { 6555 vd_scsi_t *vd_scsi; 6556 sd_prout_t *scsi_prout; 6557 mhioc_registerandignorekey_t mhd_regi; 6558 int vd_scsi_len, rv; 6559 6560 /* copyin arguments */ 6561 rv = ddi_copyin(arg, &mhd_regi, sizeof (mhd_regi), mode); 6562 if (rv != 0) 6563 return (EFAULT); 6564 6565 /* build SCSI VD_OP request */ 6566 vd_scsi = vdc_scsi_alloc_persistent_out(SD_SCSI3_REGISTERANDIGNOREKEY, 6567 sizeof (sd_prout_t), &vd_scsi_len); 6568 6569 /* set parameters */ 6570 scsi_prout = (sd_prout_t *)VD_SCSI_DATA_OUT(vd_scsi); 6571 bcopy(mhd_regi.newkey.key, scsi_prout->service_key, 6572 MHIOC_RESV_KEY_SIZE); 6573 scsi_prout->aptpl = (uchar_t)mhd_regi.aptpl; 6574 6575 /* submit the request */ 6576 rv = vdc_do_sync_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6577 0, 0, VIO_both_dir, B_FALSE); 6578 6579 if (rv == 0) 6580 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6581 6582 kmem_free(vd_scsi, vd_scsi_len); 6583 return (rv); 6584 } 6585 6586 /* 6587 * This function is used to send a (simple) SCSI command and check errors. 6588 */ 6589 static int 6590 vdc_eio_scsi_cmd(vdc_t *vdc, uchar_t scmd, int flags) 6591 { 6592 int cdb_len, sense_len, vd_scsi_len; 6593 vd_scsi_t *vd_scsi; 6594 union scsi_cdb *cdb; 6595 int rv; 6596 6597 ASSERT(scmd == SCMD_TEST_UNIT_READY || scmd == SCMD_WRITE_G1); 6598 6599 if (scmd == SCMD_WRITE_G1) 6600 cdb_len = CDB_GROUP1; 6601 else 6602 cdb_len = CDB_GROUP0; 6603 6604 sense_len = sizeof (struct scsi_extended_sense); 6605 6606 vd_scsi = vdc_scsi_alloc(cdb_len, sense_len, 0, 0, &vd_scsi_len); 6607 6608 /* set cdb */ 6609 cdb = VD_SCSI_DATA_CDB(vd_scsi); 6610 cdb->scc_cmd = scmd; 6611 6612 vd_scsi->timeout = vdc_scsi_timeout; 6613 6614 /* 6615 * Submit the request. Note the operation should not request that any 6616 * error is checked because this function is precisely called when 6617 * checking errors. 6618 */ 6619 ASSERT((flags & VDC_OP_ERRCHK) == 0); 6620 6621 rv = vdc_do_op(vdc, VD_OP_SCSICMD, (caddr_t)vd_scsi, vd_scsi_len, 6622 0, 0, NULL, VIO_both_dir, flags); 6623 6624 if (rv == 0) 6625 rv = vdc_scsi_status(vdc, vd_scsi, B_FALSE); 6626 6627 kmem_free(vd_scsi, vd_scsi_len); 6628 return (rv); 6629 } 6630 6631 /* 6632 * This function is used to check if a SCSI backend is accessible. It will 6633 * also detect reservation conflict if failfast is enabled, and panic the 6634 * system in that case. 6635 * 6636 * Returned Code: 6637 * 0 - disk is accessible 6638 * != 0 - disk is inaccessible or unable to check if disk is accessible 6639 */ 6640 static int 6641 vdc_eio_scsi_check(vdc_t *vdc, int flags) 6642 { 6643 int failure = 0; 6644 int rv; 6645 6646 /* 6647 * Send a TEST UNIT READY command. The command will panic 6648 * the system if it fails with a reservation conflict and 6649 * failfast is enabled. If there is a reservation conflict 6650 * and failfast is not enabled then the function will return 6651 * EACCES. In that case, there's no problem with accessing 6652 * the backend, it is just reserved. 6653 */ 6654 rv = vdc_eio_scsi_cmd(vdc, SCMD_TEST_UNIT_READY, flags); 6655 if (rv != 0 && rv != EACCES) 6656 failure++; 6657 6658 /* we don't need to do more checking if failfast is not enabled */ 6659 if (vdc->failfast_interval == 0) 6660 return (failure); 6661 6662 /* 6663 * With SPC-3 compliant devices TEST UNIT READY will succeed on 6664 * a reserved device, so we also do a WRITE(10) of zero byte in 6665 * order to provoke a Reservation Conflict status on those newer 6666 * devices. 6667 */ 6668 if (vdc_eio_scsi_cmd(vdc, SCMD_WRITE_G1, flags) != 0) 6669 failure++; 6670 6671 return (failure); 6672 } 6673 6674 /* 6675 * This function is used to check if a backend is effectively accessible. 6676 * 6677 * Returned Code: 6678 * 0 - disk is accessible 6679 * != 0 - disk is inaccessible or unable to check if disk is accessible 6680 */ 6681 static int 6682 vdc_eio_check(vdc_t *vdc, int flags) 6683 { 6684 char *buffer; 6685 diskaddr_t blkno; 6686 int rv; 6687 6688 ASSERT((flags & VDC_OP_ERRCHK) == 0); 6689 6690 flags |= VDC_OP_DRING_RESERVED; 6691 6692 if (VD_OP_SUPPORTED(vdc->operations, VD_OP_SCSICMD)) 6693 return (vdc_eio_scsi_check(vdc, flags)); 6694 6695 ASSERT(vdc->failfast_interval == 0); 6696 6697 /* 6698 * If the backend does not support SCSI operations then we simply 6699 * check if the backend is accessible by reading some data blocks. 6700 * We first try to read a random block, to try to avoid getting 6701 * a block that might have been cached on the service domain. Then 6702 * we try the last block, and finally the first block. 6703 * 6704 * We return success as soon as we are able to read any block. 6705 */ 6706 buffer = kmem_alloc(vdc->vdisk_bsize, KM_SLEEP); 6707 6708 if (vdc->vdisk_size > 0) { 6709 6710 /* try a random block */ 6711 (void) random_get_pseudo_bytes((uint8_t *)&blkno, 6712 sizeof (diskaddr_t)); 6713 blkno = blkno % vdc->vdisk_size; 6714 rv = vdc_do_op(vdc, VD_OP_BREAD, (caddr_t)buffer, 6715 vdc->vdisk_bsize, VD_SLICE_NONE, blkno, NULL, 6716 VIO_read_dir, flags); 6717 6718 if (rv == 0) 6719 goto done; 6720 6721 /* try the last block */ 6722 blkno = vdc->vdisk_size - 1; 6723 rv = vdc_do_op(vdc, VD_OP_BREAD, (caddr_t)buffer, 6724 vdc->vdisk_bsize, VD_SLICE_NONE, blkno, NULL, 6725 VIO_read_dir, flags); 6726 6727 if (rv == 0) 6728 goto done; 6729 } 6730 6731 /* try block 0 */ 6732 blkno = 0; 6733 rv = vdc_do_op(vdc, VD_OP_BREAD, (caddr_t)buffer, vdc->vdisk_bsize, 6734 VD_SLICE_NONE, blkno, NULL, VIO_read_dir, flags); 6735 6736 done: 6737 kmem_free(buffer, vdc->vdisk_bsize); 6738 return (rv); 6739 } 6740 6741 /* 6742 * Add a pending I/O to the eio queue. An I/O is added to this queue 6743 * when it has failed and failfast is enabled or the vdisk has multiple 6744 * servers. It will then be handled by the eio thread (vdc_eio_thread). 6745 * The eio queue is ordered starting with the most recent I/O added. 6746 */ 6747 static vdc_io_t * 6748 vdc_eio_queue(vdc_t *vdc, int index) 6749 { 6750 vdc_io_t *vio; 6751 6752 ASSERT(MUTEX_HELD(&vdc->lock)); 6753 6754 vio = kmem_alloc(sizeof (vdc_io_t), KM_SLEEP); 6755 vio->vio_next = vdc->eio_queue; 6756 vio->vio_index = index; 6757 vio->vio_qtime = ddi_get_lbolt(); 6758 6759 vdc->eio_queue = vio; 6760 6761 /* notify the eio thread that a new I/O is queued */ 6762 cv_signal(&vdc->eio_cv); 6763 6764 return (vio); 6765 } 6766 6767 /* 6768 * Remove I/Os added before the indicated deadline from the eio queue. A 6769 * deadline of 0 means that all I/Os have to be unqueued. The complete_io 6770 * boolean specifies if unqueued I/Os should be marked as completed or not. 6771 */ 6772 static void 6773 vdc_eio_unqueue(vdc_t *vdc, clock_t deadline, boolean_t complete_io) 6774 { 6775 struct buf *buf; 6776 vdc_io_t *vio, *vio_tmp; 6777 int index, op; 6778 6779 ASSERT(MUTEX_HELD(&vdc->lock)); 6780 6781 vio_tmp = NULL; 6782 vio = vdc->eio_queue; 6783 6784 if (deadline != 0) { 6785 /* 6786 * Skip any io queued after the deadline. The eio queue is 6787 * ordered starting with the last I/O added to the queue. 6788 */ 6789 while (vio != NULL && vio->vio_qtime > deadline) { 6790 vio_tmp = vio; 6791 vio = vio->vio_next; 6792 } 6793 } 6794 6795 if (vio == NULL) 6796 /* nothing to unqueue */ 6797 return; 6798 6799 /* update the queue */ 6800 if (vio_tmp == NULL) 6801 vdc->eio_queue = NULL; 6802 else 6803 vio_tmp->vio_next = NULL; 6804 6805 /* 6806 * Free and complete unqueued I/Os if this was requested. All I/Os 6807 * have a block I/O data transfer structure (buf) and they are 6808 * completed by calling biodone(). 6809 */ 6810 while (vio != NULL) { 6811 vio_tmp = vio->vio_next; 6812 6813 if (complete_io) { 6814 index = vio->vio_index; 6815 op = vdc->local_dring[index].operation; 6816 buf = vdc->local_dring[index].buf; 6817 (void) vdc_depopulate_descriptor(vdc, index); 6818 ASSERT(buf->b_flags & B_ERROR); 6819 if (op == VD_OP_BREAD || op == VD_OP_BWRITE) { 6820 VD_UPDATE_ERR_STATS(vdc, vd_softerrs); 6821 VD_KSTAT_RUNQ_EXIT(vdc); 6822 DTRACE_IO1(done, buf_t *, buf); 6823 } 6824 biodone(buf); 6825 } 6826 6827 kmem_free(vio, sizeof (vdc_io_t)); 6828 vio = vio_tmp; 6829 } 6830 } 6831 6832 /* 6833 * Error I/O Thread. There is one eio thread for each virtual disk that 6834 * has multiple servers or for which failfast is enabled. Failfast can only 6835 * be enabled for vdisk supporting SCSI commands. 6836 * 6837 * While failfast is enabled, the eio thread sends a TEST UNIT READY 6838 * and a zero size WRITE(10) SCSI commands on a regular basis to check that 6839 * we still have access to the disk. If a command fails with a RESERVATION 6840 * CONFLICT error then the system will immediatly panic. 6841 * 6842 * The eio thread is also woken up when an I/O has failed. It then checks 6843 * the access to the disk to ensure that the I/O failure was not due to a 6844 * reservation conflict or to the backend been inaccessible. 6845 * 6846 */ 6847 static void 6848 vdc_eio_thread(void *arg) 6849 { 6850 int status; 6851 vdc_t *vdc = (vdc_t *)arg; 6852 clock_t starttime, timeout = drv_usectohz(vdc->failfast_interval); 6853 6854 mutex_enter(&vdc->lock); 6855 6856 while (vdc->failfast_interval != 0 || vdc->num_servers > 1) { 6857 /* 6858 * Wait if there is nothing in the eio queue or if the state 6859 * is not VDC_STATE_RUNNING. 6860 */ 6861 if (vdc->eio_queue == NULL || vdc->state != VDC_STATE_RUNNING) { 6862 if (vdc->failfast_interval != 0) { 6863 timeout = ddi_get_lbolt() + 6864 drv_usectohz(vdc->failfast_interval); 6865 (void) cv_timedwait(&vdc->eio_cv, &vdc->lock, 6866 timeout); 6867 } else { 6868 ASSERT(vdc->num_servers > 1); 6869 (void) cv_wait(&vdc->eio_cv, &vdc->lock); 6870 } 6871 6872 if (vdc->state != VDC_STATE_RUNNING) 6873 continue; 6874 } 6875 6876 mutex_exit(&vdc->lock); 6877 6878 starttime = ddi_get_lbolt(); 6879 6880 /* check error */ 6881 status = vdc_eio_check(vdc, VDC_OP_STATE_RUNNING); 6882 6883 mutex_enter(&vdc->lock); 6884 /* 6885 * We have dropped the lock to check the backend so we have 6886 * to check that the eio thread is still enabled. 6887 */ 6888 if (vdc->failfast_interval == 0 && vdc->num_servers <= 1) 6889 break; 6890 6891 /* 6892 * If the eio queue is empty or we are not in running state 6893 * anymore then there is nothing to do. 6894 */ 6895 if (vdc->state != VDC_STATE_RUNNING || vdc->eio_queue == NULL) 6896 continue; 6897 6898 if (status == 0) { 6899 /* 6900 * The backend access has been successfully checked, 6901 * we can complete any I/O queued before the last check. 6902 */ 6903 vdc_eio_unqueue(vdc, starttime, B_TRUE); 6904 6905 } else if (vdc->num_servers > 1) { 6906 /* 6907 * The backend is inaccessible for a disk with multiple 6908 * servers. So we force a reset to switch to another 6909 * server. The reset will also clear the eio queue and 6910 * resubmit all pending I/Os. 6911 */ 6912 mutex_enter(&vdc->read_lock); 6913 vdc->read_state = VDC_READ_RESET; 6914 cv_signal(&vdc->read_cv); 6915 mutex_exit(&vdc->read_lock); 6916 } else { 6917 /* 6918 * There is only one path and the backend is not 6919 * accessible, so I/Os are actually failing because 6920 * of that. So we can complete I/O queued before the 6921 * last check. 6922 */ 6923 vdc_eio_unqueue(vdc, starttime, B_TRUE); 6924 } 6925 } 6926 6927 /* 6928 * The thread is being stopped so we can complete any queued I/O. 6929 */ 6930 vdc_eio_unqueue(vdc, 0, B_TRUE); 6931 vdc->eio_thread = NULL; 6932 mutex_exit(&vdc->lock); 6933 thread_exit(); 6934 } 6935 6936 /* 6937 * Implement the MHIOCENFAILFAST mhd(7i) ioctl. 6938 */ 6939 static int 6940 vdc_failfast(vdc_t *vdc, caddr_t arg, int mode) 6941 { 6942 unsigned int mh_time; 6943 6944 if (ddi_copyin((void *)arg, &mh_time, sizeof (int), mode)) 6945 return (EFAULT); 6946 6947 mutex_enter(&vdc->lock); 6948 if (mh_time != 0 && vdc->eio_thread == NULL) { 6949 vdc->eio_thread = thread_create(NULL, 0, 6950 vdc_eio_thread, vdc, 0, &p0, TS_RUN, 6951 v.v_maxsyspri - 2); 6952 } 6953 6954 vdc->failfast_interval = ((long)mh_time) * MILLISEC; 6955 cv_signal(&vdc->eio_cv); 6956 mutex_exit(&vdc->lock); 6957 6958 return (0); 6959 } 6960 6961 /* 6962 * Implement the MHIOCTKOWN and MHIOCRELEASE mhd(7i) ioctls. These ioctls are 6963 * converted to VD_OP_SET_ACCESS operations. 6964 */ 6965 static int 6966 vdc_access_set(vdc_t *vdc, uint64_t flags) 6967 { 6968 int rv; 6969 6970 /* submit owership command request */ 6971 rv = vdc_do_sync_op(vdc, VD_OP_SET_ACCESS, (caddr_t)&flags, 6972 sizeof (uint64_t), 0, 0, VIO_both_dir, B_TRUE); 6973 6974 return (rv); 6975 } 6976 6977 /* 6978 * Implement the MHIOCSTATUS mhd(7i) ioctl. This ioctl is converted to a 6979 * VD_OP_GET_ACCESS operation. 6980 */ 6981 static int 6982 vdc_access_get(vdc_t *vdc, uint64_t *status) 6983 { 6984 int rv; 6985 6986 /* submit owership command request */ 6987 rv = vdc_do_sync_op(vdc, VD_OP_GET_ACCESS, (caddr_t)status, 6988 sizeof (uint64_t), 0, 0, VIO_both_dir, B_TRUE); 6989 6990 return (rv); 6991 } 6992 6993 /* 6994 * Disk Ownership Thread. 6995 * 6996 * When we have taken the ownership of a disk, this thread waits to be 6997 * notified when the LDC channel is reset so that it can recover the 6998 * ownership. 6999 * 7000 * Note that the thread handling the LDC reset (vdc_process_msg_thread()) 7001 * can not be used to do the ownership recovery because it has to be 7002 * running to handle the reply message to the ownership operation. 7003 */ 7004 static void 7005 vdc_ownership_thread(void *arg) 7006 { 7007 vdc_t *vdc = (vdc_t *)arg; 7008 clock_t timeout; 7009 uint64_t status; 7010 7011 mutex_enter(&vdc->ownership_lock); 7012 mutex_enter(&vdc->lock); 7013 7014 while (vdc->ownership & VDC_OWNERSHIP_WANTED) { 7015 7016 if ((vdc->ownership & VDC_OWNERSHIP_RESET) || 7017 !(vdc->ownership & VDC_OWNERSHIP_GRANTED)) { 7018 /* 7019 * There was a reset so the ownership has been lost, 7020 * try to recover. We do this without using the preempt 7021 * option so that we don't steal the ownership from 7022 * someone who has preempted us. 7023 */ 7024 DMSG(vdc, 0, "[%d] Ownership lost, recovering", 7025 vdc->instance); 7026 7027 vdc->ownership &= ~(VDC_OWNERSHIP_RESET | 7028 VDC_OWNERSHIP_GRANTED); 7029 7030 mutex_exit(&vdc->lock); 7031 7032 status = vdc_access_set(vdc, VD_ACCESS_SET_EXCLUSIVE | 7033 VD_ACCESS_SET_PRESERVE); 7034 7035 mutex_enter(&vdc->lock); 7036 7037 if (status == 0) { 7038 DMSG(vdc, 0, "[%d] Ownership recovered", 7039 vdc->instance); 7040 vdc->ownership |= VDC_OWNERSHIP_GRANTED; 7041 } else { 7042 DMSG(vdc, 0, "[%d] Fail to recover ownership", 7043 vdc->instance); 7044 } 7045 7046 } 7047 7048 /* 7049 * If we have the ownership then we just wait for an event 7050 * to happen (LDC reset), otherwise we will retry to recover 7051 * after a delay. 7052 */ 7053 if (vdc->ownership & VDC_OWNERSHIP_GRANTED) 7054 timeout = 0; 7055 else 7056 timeout = drv_usectohz(vdc_ownership_delay); 7057 7058 /* Release the ownership_lock and wait on the vdc lock */ 7059 mutex_exit(&vdc->ownership_lock); 7060 7061 if (timeout == 0) 7062 (void) cv_wait(&vdc->ownership_cv, &vdc->lock); 7063 else 7064 (void) cv_reltimedwait(&vdc->ownership_cv, &vdc->lock, 7065 timeout, TR_CLOCK_TICK); 7066 7067 mutex_exit(&vdc->lock); 7068 7069 mutex_enter(&vdc->ownership_lock); 7070 mutex_enter(&vdc->lock); 7071 } 7072 7073 vdc->ownership_thread = NULL; 7074 mutex_exit(&vdc->lock); 7075 mutex_exit(&vdc->ownership_lock); 7076 7077 thread_exit(); 7078 } 7079 7080 static void 7081 vdc_ownership_update(vdc_t *vdc, int ownership_flags) 7082 { 7083 ASSERT(MUTEX_HELD(&vdc->ownership_lock)); 7084 7085 mutex_enter(&vdc->lock); 7086 vdc->ownership = ownership_flags; 7087 if ((vdc->ownership & VDC_OWNERSHIP_WANTED) && 7088 vdc->ownership_thread == NULL) { 7089 /* start ownership thread */ 7090 vdc->ownership_thread = thread_create(NULL, 0, 7091 vdc_ownership_thread, vdc, 0, &p0, TS_RUN, 7092 v.v_maxsyspri - 2); 7093 } else { 7094 /* notify the ownership thread */ 7095 cv_signal(&vdc->ownership_cv); 7096 } 7097 mutex_exit(&vdc->lock); 7098 } 7099 7100 /* 7101 * Get the size and the block size of a virtual disk from the vdisk server. 7102 */ 7103 static int 7104 vdc_get_capacity(vdc_t *vdc, size_t *dsk_size, size_t *blk_size) 7105 { 7106 int rv = 0; 7107 size_t alloc_len; 7108 vd_capacity_t *vd_cap; 7109 7110 ASSERT(MUTEX_NOT_HELD(&vdc->lock)); 7111 7112 alloc_len = P2ROUNDUP(sizeof (vd_capacity_t), sizeof (uint64_t)); 7113 7114 vd_cap = kmem_zalloc(alloc_len, KM_SLEEP); 7115 7116 rv = vdc_do_sync_op(vdc, VD_OP_GET_CAPACITY, (caddr_t)vd_cap, alloc_len, 7117 0, 0, VIO_both_dir, B_TRUE); 7118 7119 *dsk_size = vd_cap->vdisk_size; 7120 *blk_size = vd_cap->vdisk_block_size; 7121 7122 kmem_free(vd_cap, alloc_len); 7123 return (rv); 7124 } 7125 7126 /* 7127 * Check the disk capacity. Disk size information is updated if size has 7128 * changed. 7129 * 7130 * Return 0 if the disk capacity is available, or non-zero if it is not. 7131 */ 7132 static int 7133 vdc_check_capacity(vdc_t *vdc) 7134 { 7135 size_t dsk_size, blk_size; 7136 int rv; 7137 7138 /* 7139 * If the vdisk does not support the VD_OP_GET_CAPACITY operation 7140 * then the disk capacity has been retrieved during the handshake 7141 * and there's nothing more to do here. 7142 */ 7143 if (!VD_OP_SUPPORTED(vdc->operations, VD_OP_GET_CAPACITY)) 7144 return (0); 7145 7146 if ((rv = vdc_get_capacity(vdc, &dsk_size, &blk_size)) != 0) 7147 return (rv); 7148 7149 if (dsk_size == VD_SIZE_UNKNOWN || dsk_size == 0 || blk_size == 0) 7150 return (EINVAL); 7151 7152 mutex_enter(&vdc->lock); 7153 /* 7154 * First try to update the VIO block size (which is the same as the 7155 * vdisk block size). If this returns an error then that means that 7156 * we can not use that block size so basically the vdisk is unusable 7157 * and we return an error. 7158 */ 7159 rv = vdc_update_vio_bsize(vdc, blk_size); 7160 if (rv == 0) 7161 vdc_update_size(vdc, dsk_size, blk_size, vdc->max_xfer_sz); 7162 7163 mutex_exit(&vdc->lock); 7164 7165 return (rv); 7166 } 7167 7168 /* 7169 * This structure is used in the DKIO(7I) array below. 7170 */ 7171 typedef struct vdc_dk_ioctl { 7172 uint8_t op; /* VD_OP_XXX value */ 7173 int cmd; /* Solaris ioctl operation number */ 7174 size_t nbytes; /* size of structure to be copied */ 7175 7176 /* function to convert between vDisk and Solaris structure formats */ 7177 int (*convert)(vdc_t *vdc, void *vd_buf, void *ioctl_arg, 7178 int mode, int dir); 7179 } vdc_dk_ioctl_t; 7180 7181 /* 7182 * Subset of DKIO(7I) operations currently supported 7183 */ 7184 static vdc_dk_ioctl_t dk_ioctl[] = { 7185 {VD_OP_FLUSH, DKIOCFLUSHWRITECACHE, 0, 7186 vdc_null_copy_func}, 7187 {VD_OP_GET_WCE, DKIOCGETWCE, sizeof (int), 7188 vdc_get_wce_convert}, 7189 {VD_OP_SET_WCE, DKIOCSETWCE, sizeof (int), 7190 vdc_set_wce_convert}, 7191 {VD_OP_GET_VTOC, DKIOCGVTOC, sizeof (vd_vtoc_t), 7192 vdc_get_vtoc_convert}, 7193 {VD_OP_SET_VTOC, DKIOCSVTOC, sizeof (vd_vtoc_t), 7194 vdc_set_vtoc_convert}, 7195 {VD_OP_GET_VTOC, DKIOCGEXTVTOC, sizeof (vd_vtoc_t), 7196 vdc_get_extvtoc_convert}, 7197 {VD_OP_SET_VTOC, DKIOCSEXTVTOC, sizeof (vd_vtoc_t), 7198 vdc_set_extvtoc_convert}, 7199 {VD_OP_GET_DISKGEOM, DKIOCGGEOM, sizeof (vd_geom_t), 7200 vdc_get_geom_convert}, 7201 {VD_OP_GET_DISKGEOM, DKIOCG_PHYGEOM, sizeof (vd_geom_t), 7202 vdc_get_geom_convert}, 7203 {VD_OP_GET_DISKGEOM, DKIOCG_VIRTGEOM, sizeof (vd_geom_t), 7204 vdc_get_geom_convert}, 7205 {VD_OP_SET_DISKGEOM, DKIOCSGEOM, sizeof (vd_geom_t), 7206 vdc_set_geom_convert}, 7207 {VD_OP_GET_EFI, DKIOCGETEFI, 0, 7208 vdc_get_efi_convert}, 7209 {VD_OP_SET_EFI, DKIOCSETEFI, 0, 7210 vdc_set_efi_convert}, 7211 7212 /* DIOCTL_RWCMD is converted to a read or a write */ 7213 {0, DIOCTL_RWCMD, sizeof (struct dadkio_rwcmd), NULL}, 7214 7215 /* mhd(7I) non-shared multihost disks ioctls */ 7216 {0, MHIOCTKOWN, 0, vdc_null_copy_func}, 7217 {0, MHIOCRELEASE, 0, vdc_null_copy_func}, 7218 {0, MHIOCSTATUS, 0, vdc_null_copy_func}, 7219 {0, MHIOCQRESERVE, 0, vdc_null_copy_func}, 7220 7221 /* mhd(7I) shared multihost disks ioctls */ 7222 {0, MHIOCGRP_INKEYS, 0, vdc_null_copy_func}, 7223 {0, MHIOCGRP_INRESV, 0, vdc_null_copy_func}, 7224 {0, MHIOCGRP_REGISTER, 0, vdc_null_copy_func}, 7225 {0, MHIOCGRP_RESERVE, 0, vdc_null_copy_func}, 7226 {0, MHIOCGRP_PREEMPTANDABORT, 0, vdc_null_copy_func}, 7227 {0, MHIOCGRP_REGISTERANDIGNOREKEY, 0, vdc_null_copy_func}, 7228 7229 /* mhd(7I) failfast ioctl */ 7230 {0, MHIOCENFAILFAST, 0, vdc_null_copy_func}, 7231 7232 /* 7233 * These particular ioctls are not sent to the server - vdc fakes up 7234 * the necessary info. 7235 */ 7236 {0, DKIOCINFO, sizeof (struct dk_cinfo), vdc_null_copy_func}, 7237 {0, DKIOCGMEDIAINFO, sizeof (struct dk_minfo), vdc_null_copy_func}, 7238 {0, USCSICMD, sizeof (struct uscsi_cmd), vdc_null_copy_func}, 7239 {0, DKIOCPARTITION, 0, vdc_null_copy_func }, 7240 {0, DKIOCGAPART, 0, vdc_null_copy_func }, 7241 {0, DKIOCREMOVABLE, 0, vdc_null_copy_func}, 7242 {0, CDROMREADOFFSET, 0, vdc_null_copy_func} 7243 }; 7244 7245 /* 7246 * This function handles ioctl requests from the vd_efi_alloc_and_read() 7247 * function and forward them to the vdisk. 7248 */ 7249 static int 7250 vd_process_efi_ioctl(void *vdisk, int cmd, uintptr_t arg) 7251 { 7252 vdc_t *vdc = (vdc_t *)vdisk; 7253 dev_t dev; 7254 int rval; 7255 7256 dev = makedevice(ddi_driver_major(vdc->dip), 7257 VD_MAKE_DEV(vdc->instance, 0)); 7258 7259 return (vd_process_ioctl(dev, cmd, (caddr_t)arg, FKIOCTL, &rval)); 7260 } 7261 7262 /* 7263 * Function: 7264 * vd_process_ioctl() 7265 * 7266 * Description: 7267 * This routine processes disk specific ioctl calls 7268 * 7269 * Arguments: 7270 * dev - the device number 7271 * cmd - the operation [dkio(7I)] to be processed 7272 * arg - pointer to user provided structure 7273 * (contains data to be set or reference parameter for get) 7274 * mode - bit flag, indicating open settings, 32/64 bit type, etc 7275 * rvalp - pointer to return value for calling process. 7276 * 7277 * Return Code: 7278 * 0 7279 * EFAULT 7280 * ENXIO 7281 * EIO 7282 * ENOTSUP 7283 */ 7284 static int 7285 vd_process_ioctl(dev_t dev, int cmd, caddr_t arg, int mode, int *rvalp) 7286 { 7287 int instance = VDCUNIT(dev); 7288 vdc_t *vdc = NULL; 7289 int rv = -1; 7290 int idx = 0; /* index into dk_ioctl[] */ 7291 size_t len = 0; /* #bytes to send to vds */ 7292 size_t alloc_len = 0; /* #bytes to allocate mem for */ 7293 caddr_t mem_p = NULL; 7294 size_t nioctls = (sizeof (dk_ioctl)) / (sizeof (dk_ioctl[0])); 7295 vdc_dk_ioctl_t *iop; 7296 7297 vdc = ddi_get_soft_state(vdc_state, instance); 7298 if (vdc == NULL) { 7299 cmn_err(CE_NOTE, "![%d] Could not get soft state structure", 7300 instance); 7301 return (ENXIO); 7302 } 7303 7304 DMSG(vdc, 0, "[%d] Processing ioctl(%x) for dev %lx : model %x\n", 7305 instance, cmd, dev, ddi_model_convert_from(mode & FMODELS)); 7306 7307 if (rvalp != NULL) { 7308 /* the return value of the ioctl is 0 by default */ 7309 *rvalp = 0; 7310 } 7311 7312 /* 7313 * Validate the ioctl operation to be performed. 7314 * 7315 * If we have looped through the array without finding a match then we 7316 * don't support this ioctl. 7317 */ 7318 for (idx = 0; idx < nioctls; idx++) { 7319 if (cmd == dk_ioctl[idx].cmd) 7320 break; 7321 } 7322 7323 if (idx >= nioctls) { 7324 DMSG(vdc, 0, "[%d] Unsupported ioctl (0x%x)\n", 7325 vdc->instance, cmd); 7326 return (ENOTSUP); 7327 } 7328 7329 iop = &(dk_ioctl[idx]); 7330 7331 if (cmd == DKIOCGETEFI || cmd == DKIOCSETEFI) { 7332 /* size is not fixed for EFI ioctls, it depends on ioctl arg */ 7333 dk_efi_t dk_efi; 7334 7335 rv = ddi_copyin(arg, &dk_efi, sizeof (dk_efi_t), mode); 7336 if (rv != 0) 7337 return (EFAULT); 7338 7339 len = sizeof (vd_efi_t) - 1 + dk_efi.dki_length; 7340 } else { 7341 len = iop->nbytes; 7342 } 7343 7344 /* check if the ioctl is applicable */ 7345 switch (cmd) { 7346 case CDROMREADOFFSET: 7347 case DKIOCREMOVABLE: 7348 return (ENOTTY); 7349 7350 case USCSICMD: 7351 case MHIOCTKOWN: 7352 case MHIOCSTATUS: 7353 case MHIOCQRESERVE: 7354 case MHIOCRELEASE: 7355 case MHIOCGRP_INKEYS: 7356 case MHIOCGRP_INRESV: 7357 case MHIOCGRP_REGISTER: 7358 case MHIOCGRP_RESERVE: 7359 case MHIOCGRP_PREEMPTANDABORT: 7360 case MHIOCGRP_REGISTERANDIGNOREKEY: 7361 case MHIOCENFAILFAST: 7362 if (vdc->cinfo == NULL) 7363 return (ENXIO); 7364 if (vdc->cinfo->dki_ctype != DKC_SCSI_CCS) 7365 return (ENOTTY); 7366 break; 7367 7368 case DIOCTL_RWCMD: 7369 if (vdc->cinfo == NULL) 7370 return (ENXIO); 7371 if (vdc->cinfo->dki_ctype != DKC_DIRECT) 7372 return (ENOTTY); 7373 break; 7374 7375 case DKIOCINFO: 7376 if (vdc->cinfo == NULL) 7377 return (ENXIO); 7378 break; 7379 7380 case DKIOCGMEDIAINFO: 7381 if (vdc->minfo == NULL) 7382 return (ENXIO); 7383 if (vdc_check_capacity(vdc) != 0) 7384 /* disk capacity is not available */ 7385 return (EIO); 7386 break; 7387 } 7388 7389 /* 7390 * Deal with ioctls which require a processing different than 7391 * converting ioctl arguments and sending a corresponding 7392 * VD operation. 7393 */ 7394 switch (cmd) { 7395 7396 case USCSICMD: 7397 { 7398 return (vdc_uscsi_cmd(vdc, arg, mode)); 7399 } 7400 7401 case MHIOCTKOWN: 7402 { 7403 mutex_enter(&vdc->ownership_lock); 7404 /* 7405 * We have to set VDC_OWNERSHIP_WANTED now so that the ownership 7406 * can be flagged with VDC_OWNERSHIP_RESET if the LDC is reset 7407 * while we are processing the ioctl. 7408 */ 7409 vdc_ownership_update(vdc, VDC_OWNERSHIP_WANTED); 7410 7411 rv = vdc_access_set(vdc, VD_ACCESS_SET_EXCLUSIVE | 7412 VD_ACCESS_SET_PREEMPT | VD_ACCESS_SET_PRESERVE); 7413 if (rv == 0) { 7414 vdc_ownership_update(vdc, VDC_OWNERSHIP_WANTED | 7415 VDC_OWNERSHIP_GRANTED); 7416 } else { 7417 vdc_ownership_update(vdc, VDC_OWNERSHIP_NONE); 7418 } 7419 mutex_exit(&vdc->ownership_lock); 7420 return (rv); 7421 } 7422 7423 case MHIOCRELEASE: 7424 { 7425 mutex_enter(&vdc->ownership_lock); 7426 rv = vdc_access_set(vdc, VD_ACCESS_SET_CLEAR); 7427 if (rv == 0) { 7428 vdc_ownership_update(vdc, VDC_OWNERSHIP_NONE); 7429 } 7430 mutex_exit(&vdc->ownership_lock); 7431 return (rv); 7432 } 7433 7434 case MHIOCSTATUS: 7435 { 7436 uint64_t status; 7437 7438 rv = vdc_access_get(vdc, &status); 7439 if (rv == 0 && rvalp != NULL) 7440 *rvalp = (status & VD_ACCESS_ALLOWED)? 0 : 1; 7441 return (rv); 7442 } 7443 7444 case MHIOCQRESERVE: 7445 { 7446 rv = vdc_access_set(vdc, VD_ACCESS_SET_EXCLUSIVE); 7447 return (rv); 7448 } 7449 7450 case MHIOCGRP_INKEYS: 7451 { 7452 return (vdc_mhd_inkeys(vdc, arg, mode)); 7453 } 7454 7455 case MHIOCGRP_INRESV: 7456 { 7457 return (vdc_mhd_inresv(vdc, arg, mode)); 7458 } 7459 7460 case MHIOCGRP_REGISTER: 7461 { 7462 return (vdc_mhd_register(vdc, arg, mode)); 7463 } 7464 7465 case MHIOCGRP_RESERVE: 7466 { 7467 return (vdc_mhd_reserve(vdc, arg, mode)); 7468 } 7469 7470 case MHIOCGRP_PREEMPTANDABORT: 7471 { 7472 return (vdc_mhd_preemptabort(vdc, arg, mode)); 7473 } 7474 7475 case MHIOCGRP_REGISTERANDIGNOREKEY: 7476 { 7477 return (vdc_mhd_registerignore(vdc, arg, mode)); 7478 } 7479 7480 case MHIOCENFAILFAST: 7481 { 7482 rv = vdc_failfast(vdc, arg, mode); 7483 return (rv); 7484 } 7485 7486 case DIOCTL_RWCMD: 7487 { 7488 return (vdc_dioctl_rwcmd(vdc, arg, mode)); 7489 } 7490 7491 case DKIOCGAPART: 7492 { 7493 return (vdc_dkio_gapart(vdc, arg, mode)); 7494 } 7495 7496 case DKIOCPARTITION: 7497 { 7498 return (vdc_dkio_partition(vdc, arg, mode)); 7499 } 7500 7501 case DKIOCINFO: 7502 { 7503 struct dk_cinfo cinfo; 7504 7505 bcopy(vdc->cinfo, &cinfo, sizeof (struct dk_cinfo)); 7506 cinfo.dki_partition = VDCPART(dev); 7507 7508 rv = ddi_copyout(&cinfo, (void *)arg, 7509 sizeof (struct dk_cinfo), mode); 7510 if (rv != 0) 7511 return (EFAULT); 7512 7513 return (0); 7514 } 7515 7516 case DKIOCGMEDIAINFO: 7517 { 7518 ASSERT(vdc->vdisk_size != 0); 7519 ASSERT(vdc->minfo->dki_capacity != 0); 7520 rv = ddi_copyout(vdc->minfo, (void *)arg, 7521 sizeof (struct dk_minfo), mode); 7522 if (rv != 0) 7523 return (EFAULT); 7524 7525 return (0); 7526 } 7527 7528 case DKIOCFLUSHWRITECACHE: 7529 { 7530 struct dk_callback *dkc = 7531 (struct dk_callback *)(uintptr_t)arg; 7532 vdc_dk_arg_t *dkarg = NULL; 7533 7534 DMSG(vdc, 1, "[%d] Flush W$: mode %x\n", 7535 instance, mode); 7536 7537 /* 7538 * If arg is NULL, then there is no callback function 7539 * registered and the call operates synchronously; we 7540 * break and continue with the rest of the function and 7541 * wait for vds to return (i.e. after the request to 7542 * vds returns successfully, all writes completed prior 7543 * to the ioctl will have been flushed from the disk 7544 * write cache to persistent media. 7545 * 7546 * If a callback function is registered, we dispatch 7547 * the request on a task queue and return immediately. 7548 * The callback will deal with informing the calling 7549 * thread that the flush request is completed. 7550 */ 7551 if (dkc == NULL) 7552 break; 7553 7554 /* 7555 * the asynchronous callback is only supported if 7556 * invoked from within the kernel 7557 */ 7558 if ((mode & FKIOCTL) == 0) 7559 return (ENOTSUP); 7560 7561 dkarg = kmem_zalloc(sizeof (vdc_dk_arg_t), KM_SLEEP); 7562 7563 dkarg->mode = mode; 7564 dkarg->dev = dev; 7565 bcopy(dkc, &dkarg->dkc, sizeof (*dkc)); 7566 7567 mutex_enter(&vdc->lock); 7568 vdc->dkio_flush_pending++; 7569 dkarg->vdc = vdc; 7570 mutex_exit(&vdc->lock); 7571 7572 /* put the request on a task queue */ 7573 rv = taskq_dispatch(system_taskq, vdc_dkio_flush_cb, 7574 (void *)dkarg, DDI_SLEEP); 7575 if (rv == TASKQID_INVALID) { 7576 /* clean up if dispatch fails */ 7577 mutex_enter(&vdc->lock); 7578 vdc->dkio_flush_pending--; 7579 mutex_exit(&vdc->lock); 7580 kmem_free(dkarg, sizeof (vdc_dk_arg_t)); 7581 } 7582 7583 return (rv == NULL ? ENOMEM : 0); 7584 } 7585 } 7586 7587 /* catch programming error in vdc - should be a VD_OP_XXX ioctl */ 7588 ASSERT(iop->op != 0); 7589 7590 /* check if the vDisk server handles the operation for this vDisk */ 7591 if (VD_OP_SUPPORTED(vdc->operations, iop->op) == B_FALSE) { 7592 DMSG(vdc, 0, "[%d] Unsupported VD_OP operation (0x%x)\n", 7593 vdc->instance, iop->op); 7594 return (ENOTSUP); 7595 } 7596 7597 /* LDC requires that the memory being mapped is 8-byte aligned */ 7598 alloc_len = P2ROUNDUP(len, sizeof (uint64_t)); 7599 DMSG(vdc, 1, "[%d] struct size %ld alloc %ld\n", 7600 instance, len, alloc_len); 7601 7602 if (alloc_len > 0) 7603 mem_p = kmem_zalloc(alloc_len, KM_SLEEP); 7604 7605 /* 7606 * Call the conversion function for this ioctl which, if necessary, 7607 * converts from the Solaris format to the format ARC'ed 7608 * as part of the vDisk protocol (FWARC 2006/195) 7609 */ 7610 ASSERT(iop->convert != NULL); 7611 rv = (iop->convert)(vdc, arg, mem_p, mode, VD_COPYIN); 7612 if (rv != 0) { 7613 DMSG(vdc, 0, "[%d] convert func returned %d for ioctl 0x%x\n", 7614 instance, rv, cmd); 7615 if (mem_p != NULL) 7616 kmem_free(mem_p, alloc_len); 7617 return (rv); 7618 } 7619 7620 /* 7621 * send request to vds to service the ioctl. 7622 */ 7623 rv = vdc_do_sync_op(vdc, iop->op, mem_p, alloc_len, 7624 VDCPART(dev), 0, VIO_both_dir, B_TRUE); 7625 7626 if (rv != 0) { 7627 /* 7628 * This is not necessarily an error. The ioctl could 7629 * be returning a value such as ENOTTY to indicate 7630 * that the ioctl is not applicable. 7631 */ 7632 DMSG(vdc, 0, "[%d] vds returned %d for ioctl 0x%x\n", 7633 instance, rv, cmd); 7634 if (mem_p != NULL) 7635 kmem_free(mem_p, alloc_len); 7636 7637 return (rv); 7638 } 7639 7640 /* 7641 * Call the conversion function (if it exists) for this ioctl 7642 * which converts from the format ARC'ed as part of the vDisk 7643 * protocol (FWARC 2006/195) back to a format understood by 7644 * the rest of Solaris. 7645 */ 7646 rv = (iop->convert)(vdc, mem_p, arg, mode, VD_COPYOUT); 7647 if (rv != 0) { 7648 DMSG(vdc, 0, "[%d] convert func returned %d for ioctl 0x%x\n", 7649 instance, rv, cmd); 7650 if (mem_p != NULL) 7651 kmem_free(mem_p, alloc_len); 7652 return (rv); 7653 } 7654 7655 if (mem_p != NULL) 7656 kmem_free(mem_p, alloc_len); 7657 7658 return (rv); 7659 } 7660 7661 /* 7662 * Function: 7663 * 7664 * Description: 7665 * This is an empty conversion function used by ioctl calls which 7666 * do not need to convert the data being passed in/out to userland 7667 */ 7668 static int 7669 vdc_null_copy_func(vdc_t *vdc, void *from, void *to, int mode, int dir) 7670 { 7671 _NOTE(ARGUNUSED(vdc)) 7672 _NOTE(ARGUNUSED(from)) 7673 _NOTE(ARGUNUSED(to)) 7674 _NOTE(ARGUNUSED(mode)) 7675 _NOTE(ARGUNUSED(dir)) 7676 7677 return (0); 7678 } 7679 7680 static int 7681 vdc_get_wce_convert(vdc_t *vdc, void *from, void *to, 7682 int mode, int dir) 7683 { 7684 _NOTE(ARGUNUSED(vdc)) 7685 7686 if (dir == VD_COPYIN) 7687 return (0); /* nothing to do */ 7688 7689 if (ddi_copyout(from, to, sizeof (int), mode) != 0) 7690 return (EFAULT); 7691 7692 return (0); 7693 } 7694 7695 static int 7696 vdc_set_wce_convert(vdc_t *vdc, void *from, void *to, 7697 int mode, int dir) 7698 { 7699 _NOTE(ARGUNUSED(vdc)) 7700 7701 if (dir == VD_COPYOUT) 7702 return (0); /* nothing to do */ 7703 7704 if (ddi_copyin(from, to, sizeof (int), mode) != 0) 7705 return (EFAULT); 7706 7707 return (0); 7708 } 7709 7710 /* 7711 * Function: 7712 * vdc_get_vtoc_convert() 7713 * 7714 * Description: 7715 * This routine performs the necessary convertions from the DKIOCGVTOC 7716 * Solaris structure to the format defined in FWARC 2006/195. 7717 * 7718 * In the struct vtoc definition, the timestamp field is marked as not 7719 * supported so it is not part of vDisk protocol (FWARC 2006/195). 7720 * However SVM uses that field to check it can write into the VTOC, 7721 * so we fake up the info of that field. 7722 * 7723 * Arguments: 7724 * vdc - the vDisk client 7725 * from - the buffer containing the data to be copied from 7726 * to - the buffer to be copied to 7727 * mode - flags passed to ioctl() call 7728 * dir - the "direction" of the copy - VD_COPYIN or VD_COPYOUT 7729 * 7730 * Return Code: 7731 * 0 - Success 7732 * ENXIO - incorrect buffer passed in. 7733 * EFAULT - ddi_copyout routine encountered an error. 7734 */ 7735 static int 7736 vdc_get_vtoc_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7737 { 7738 int i; 7739 struct vtoc vtoc; 7740 struct vtoc32 vtoc32; 7741 struct extvtoc evtoc; 7742 int rv; 7743 7744 if (dir != VD_COPYOUT) 7745 return (0); /* nothing to do */ 7746 7747 if ((from == NULL) || (to == NULL)) 7748 return (ENXIO); 7749 7750 if (vdc->vdisk_size > VD_OLDVTOC_LIMIT) 7751 return (EOVERFLOW); 7752 7753 VD_VTOC2VTOC((vd_vtoc_t *)from, &evtoc); 7754 7755 /* fake the VTOC timestamp field */ 7756 for (i = 0; i < V_NUMPAR; i++) { 7757 evtoc.timestamp[i] = vdc->vtoc->timestamp[i]; 7758 } 7759 7760 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 7761 /* LINTED E_ASSIGN_NARROW_CONV */ 7762 extvtoctovtoc32(evtoc, vtoc32); 7763 rv = ddi_copyout(&vtoc32, to, sizeof (vtoc32), mode); 7764 if (rv != 0) 7765 rv = EFAULT; 7766 } else { 7767 extvtoctovtoc(evtoc, vtoc); 7768 rv = ddi_copyout(&vtoc, to, sizeof (vtoc), mode); 7769 if (rv != 0) 7770 rv = EFAULT; 7771 } 7772 7773 return (rv); 7774 } 7775 7776 /* 7777 * Function: 7778 * vdc_set_vtoc_convert() 7779 * 7780 * Description: 7781 * This routine performs the necessary convertions from the DKIOCSVTOC 7782 * Solaris structure to the format defined in FWARC 2006/195. 7783 * 7784 * Arguments: 7785 * vdc - the vDisk client 7786 * from - Buffer with data 7787 * to - Buffer where data is to be copied to 7788 * mode - flags passed to ioctl 7789 * dir - direction of copy (in or out) 7790 * 7791 * Return Code: 7792 * 0 - Success 7793 * ENXIO - Invalid buffer passed in 7794 * EFAULT - ddi_copyin of data failed 7795 */ 7796 static int 7797 vdc_set_vtoc_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7798 { 7799 void *uvtoc; 7800 struct vtoc vtoc; 7801 struct vtoc32 vtoc32; 7802 struct extvtoc evtoc; 7803 int i, rv; 7804 7805 if ((from == NULL) || (to == NULL)) 7806 return (ENXIO); 7807 7808 if (vdc->vdisk_size > VD_OLDVTOC_LIMIT) 7809 return (EOVERFLOW); 7810 7811 uvtoc = (dir == VD_COPYIN)? from : to; 7812 7813 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 7814 rv = ddi_copyin(uvtoc, &vtoc32, sizeof (vtoc32), mode); 7815 if (rv != 0) 7816 return (EFAULT); 7817 vtoc32toextvtoc(vtoc32, evtoc); 7818 } else { 7819 rv = ddi_copyin(uvtoc, &vtoc, sizeof (vtoc), mode); 7820 if (rv != 0) 7821 return (EFAULT); 7822 vtoctoextvtoc(vtoc, evtoc); 7823 } 7824 7825 if (dir == VD_COPYOUT) { 7826 /* 7827 * The disk label may have changed. Revalidate the disk 7828 * geometry. This will also update the device nodes. 7829 */ 7830 vdc_validate(vdc); 7831 7832 /* 7833 * We also need to keep track of the timestamp fields. 7834 */ 7835 for (i = 0; i < V_NUMPAR; i++) { 7836 vdc->vtoc->timestamp[i] = evtoc.timestamp[i]; 7837 } 7838 7839 } else { 7840 VTOC2VD_VTOC(&evtoc, (vd_vtoc_t *)to); 7841 } 7842 7843 return (0); 7844 } 7845 7846 static int 7847 vdc_get_extvtoc_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7848 { 7849 int i, rv; 7850 struct extvtoc evtoc; 7851 7852 if (dir != VD_COPYOUT) 7853 return (0); /* nothing to do */ 7854 7855 if ((from == NULL) || (to == NULL)) 7856 return (ENXIO); 7857 7858 VD_VTOC2VTOC((vd_vtoc_t *)from, &evtoc); 7859 7860 /* fake the VTOC timestamp field */ 7861 for (i = 0; i < V_NUMPAR; i++) { 7862 evtoc.timestamp[i] = vdc->vtoc->timestamp[i]; 7863 } 7864 7865 rv = ddi_copyout(&evtoc, to, sizeof (struct extvtoc), mode); 7866 if (rv != 0) 7867 rv = EFAULT; 7868 7869 return (rv); 7870 } 7871 7872 static int 7873 vdc_set_extvtoc_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7874 { 7875 void *uvtoc; 7876 struct extvtoc evtoc; 7877 int i, rv; 7878 7879 if ((from == NULL) || (to == NULL)) 7880 return (ENXIO); 7881 7882 uvtoc = (dir == VD_COPYIN)? from : to; 7883 7884 rv = ddi_copyin(uvtoc, &evtoc, sizeof (struct extvtoc), mode); 7885 if (rv != 0) 7886 return (EFAULT); 7887 7888 if (dir == VD_COPYOUT) { 7889 /* 7890 * The disk label may have changed. Revalidate the disk 7891 * geometry. This will also update the device nodes. 7892 */ 7893 vdc_validate(vdc); 7894 7895 /* 7896 * We also need to keep track of the timestamp fields. 7897 */ 7898 for (i = 0; i < V_NUMPAR; i++) { 7899 vdc->vtoc->timestamp[i] = evtoc.timestamp[i]; 7900 } 7901 7902 } else { 7903 VTOC2VD_VTOC(&evtoc, (vd_vtoc_t *)to); 7904 } 7905 7906 return (0); 7907 } 7908 7909 /* 7910 * Function: 7911 * vdc_get_geom_convert() 7912 * 7913 * Description: 7914 * This routine performs the necessary convertions from the DKIOCGGEOM, 7915 * DKIOCG_PHYSGEOM and DKIOG_VIRTGEOM Solaris structures to the format 7916 * defined in FWARC 2006/195 7917 * 7918 * Arguments: 7919 * vdc - the vDisk client 7920 * from - Buffer with data 7921 * to - Buffer where data is to be copied to 7922 * mode - flags passed to ioctl 7923 * dir - direction of copy (in or out) 7924 * 7925 * Return Code: 7926 * 0 - Success 7927 * ENXIO - Invalid buffer passed in 7928 * EFAULT - ddi_copyout of data failed 7929 */ 7930 static int 7931 vdc_get_geom_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7932 { 7933 _NOTE(ARGUNUSED(vdc)) 7934 7935 struct dk_geom geom; 7936 int copy_len = sizeof (struct dk_geom); 7937 int rv = 0; 7938 7939 if (dir != VD_COPYOUT) 7940 return (0); /* nothing to do */ 7941 7942 if ((from == NULL) || (to == NULL)) 7943 return (ENXIO); 7944 7945 VD_GEOM2DK_GEOM((vd_geom_t *)from, &geom); 7946 rv = ddi_copyout(&geom, to, copy_len, mode); 7947 if (rv != 0) 7948 rv = EFAULT; 7949 7950 return (rv); 7951 } 7952 7953 /* 7954 * Function: 7955 * vdc_set_geom_convert() 7956 * 7957 * Description: 7958 * This routine performs the necessary convertions from the DKIOCSGEOM 7959 * Solaris structure to the format defined in FWARC 2006/195. 7960 * 7961 * Arguments: 7962 * vdc - the vDisk client 7963 * from - Buffer with data 7964 * to - Buffer where data is to be copied to 7965 * mode - flags passed to ioctl 7966 * dir - direction of copy (in or out) 7967 * 7968 * Return Code: 7969 * 0 - Success 7970 * ENXIO - Invalid buffer passed in 7971 * EFAULT - ddi_copyin of data failed 7972 */ 7973 static int 7974 vdc_set_geom_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 7975 { 7976 _NOTE(ARGUNUSED(vdc)) 7977 7978 vd_geom_t vdgeom; 7979 void *tmp_mem = NULL; 7980 int copy_len = sizeof (struct dk_geom); 7981 int rv = 0; 7982 7983 if (dir != VD_COPYIN) 7984 return (0); /* nothing to do */ 7985 7986 if ((from == NULL) || (to == NULL)) 7987 return (ENXIO); 7988 7989 tmp_mem = kmem_alloc(copy_len, KM_SLEEP); 7990 7991 rv = ddi_copyin(from, tmp_mem, copy_len, mode); 7992 if (rv != 0) { 7993 kmem_free(tmp_mem, copy_len); 7994 return (EFAULT); 7995 } 7996 DK_GEOM2VD_GEOM((struct dk_geom *)tmp_mem, &vdgeom); 7997 bcopy(&vdgeom, to, sizeof (vdgeom)); 7998 kmem_free(tmp_mem, copy_len); 7999 8000 return (0); 8001 } 8002 8003 static int 8004 vdc_get_efi_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 8005 { 8006 _NOTE(ARGUNUSED(vdc)) 8007 8008 vd_efi_t *vd_efi; 8009 dk_efi_t dk_efi; 8010 int rv = 0; 8011 void *uaddr; 8012 8013 if ((from == NULL) || (to == NULL)) 8014 return (ENXIO); 8015 8016 if (dir == VD_COPYIN) { 8017 8018 vd_efi = (vd_efi_t *)to; 8019 8020 rv = ddi_copyin(from, &dk_efi, sizeof (dk_efi_t), mode); 8021 if (rv != 0) 8022 return (EFAULT); 8023 8024 vd_efi->lba = dk_efi.dki_lba; 8025 vd_efi->length = dk_efi.dki_length; 8026 bzero(vd_efi->data, vd_efi->length); 8027 8028 } else { 8029 8030 rv = ddi_copyin(to, &dk_efi, sizeof (dk_efi_t), mode); 8031 if (rv != 0) 8032 return (EFAULT); 8033 8034 uaddr = dk_efi.dki_data; 8035 8036 dk_efi.dki_data = kmem_alloc(dk_efi.dki_length, KM_SLEEP); 8037 8038 VD_EFI2DK_EFI((vd_efi_t *)from, &dk_efi); 8039 8040 rv = ddi_copyout(dk_efi.dki_data, uaddr, dk_efi.dki_length, 8041 mode); 8042 if (rv != 0) 8043 return (EFAULT); 8044 8045 kmem_free(dk_efi.dki_data, dk_efi.dki_length); 8046 } 8047 8048 return (0); 8049 } 8050 8051 static int 8052 vdc_set_efi_convert(vdc_t *vdc, void *from, void *to, int mode, int dir) 8053 { 8054 _NOTE(ARGUNUSED(vdc)) 8055 8056 dk_efi_t dk_efi; 8057 void *uaddr; 8058 8059 if (dir == VD_COPYOUT) { 8060 /* 8061 * The disk label may have changed. Revalidate the disk 8062 * geometry. This will also update the device nodes. 8063 */ 8064 vdc_validate(vdc); 8065 return (0); 8066 } 8067 8068 if ((from == NULL) || (to == NULL)) 8069 return (ENXIO); 8070 8071 if (ddi_copyin(from, &dk_efi, sizeof (dk_efi_t), mode) != 0) 8072 return (EFAULT); 8073 8074 uaddr = dk_efi.dki_data; 8075 8076 dk_efi.dki_data = kmem_alloc(dk_efi.dki_length, KM_SLEEP); 8077 8078 if (ddi_copyin(uaddr, dk_efi.dki_data, dk_efi.dki_length, mode) != 0) 8079 return (EFAULT); 8080 8081 DK_EFI2VD_EFI(&dk_efi, (vd_efi_t *)to); 8082 8083 kmem_free(dk_efi.dki_data, dk_efi.dki_length); 8084 8085 return (0); 8086 } 8087 8088 8089 /* -------------------------------------------------------------------------- */ 8090 8091 /* 8092 * Function: 8093 * vdc_create_fake_geometry() 8094 * 8095 * Description: 8096 * This routine fakes up the disk info needed for some DKIO ioctls such 8097 * as DKIOCINFO and DKIOCGMEDIAINFO [just like lofi(7D) and ramdisk(7D) do] 8098 * 8099 * Note: This function must not be called until the vDisk attributes have 8100 * been exchanged as part of the handshake with the vDisk server. 8101 * 8102 * Arguments: 8103 * vdc - soft state pointer for this instance of the device driver. 8104 * 8105 * Return Code: 8106 * none. 8107 */ 8108 static void 8109 vdc_create_fake_geometry(vdc_t *vdc) 8110 { 8111 ASSERT(vdc != NULL); 8112 ASSERT(vdc->max_xfer_sz != 0); 8113 8114 /* 8115 * DKIOCINFO support 8116 */ 8117 if (vdc->cinfo == NULL) 8118 vdc->cinfo = kmem_zalloc(sizeof (struct dk_cinfo), KM_SLEEP); 8119 8120 (void) strcpy(vdc->cinfo->dki_cname, VDC_DRIVER_NAME); 8121 (void) strcpy(vdc->cinfo->dki_dname, VDC_DRIVER_NAME); 8122 /* max_xfer_sz is #blocks so we don't need to divide by vdisk_bsize */ 8123 vdc->cinfo->dki_maxtransfer = vdc->max_xfer_sz; 8124 8125 /* 8126 * We set the controller type to DKC_SCSI_CCS only if the VD_OP_SCSICMD 8127 * operation is supported, otherwise the controller type is DKC_DIRECT. 8128 * Version 1.0 does not support the VD_OP_SCSICMD operation, so the 8129 * controller type is always DKC_DIRECT in that case. 8130 * 8131 * If the virtual disk is backed by a physical CD/DVD device or 8132 * an ISO image, modify the controller type to indicate this 8133 */ 8134 switch (vdc->vdisk_media) { 8135 case VD_MEDIA_CD: 8136 case VD_MEDIA_DVD: 8137 vdc->cinfo->dki_ctype = DKC_CDROM; 8138 break; 8139 case VD_MEDIA_FIXED: 8140 if (VD_OP_SUPPORTED(vdc->operations, VD_OP_SCSICMD)) 8141 vdc->cinfo->dki_ctype = DKC_SCSI_CCS; 8142 else 8143 vdc->cinfo->dki_ctype = DKC_DIRECT; 8144 break; 8145 default: 8146 /* in the case of v1.0 we default to a fixed disk */ 8147 vdc->cinfo->dki_ctype = DKC_DIRECT; 8148 break; 8149 } 8150 vdc->cinfo->dki_flags = DKI_FMTVOL; 8151 vdc->cinfo->dki_cnum = 0; 8152 vdc->cinfo->dki_addr = 0; 8153 vdc->cinfo->dki_space = 0; 8154 vdc->cinfo->dki_prio = 0; 8155 vdc->cinfo->dki_vec = 0; 8156 vdc->cinfo->dki_unit = vdc->instance; 8157 vdc->cinfo->dki_slave = 0; 8158 /* 8159 * The partition number will be created on the fly depending on the 8160 * actual slice (i.e. minor node) that is used to request the data. 8161 */ 8162 vdc->cinfo->dki_partition = 0; 8163 8164 /* 8165 * DKIOCGMEDIAINFO support 8166 */ 8167 if (vdc->minfo == NULL) 8168 vdc->minfo = kmem_zalloc(sizeof (struct dk_minfo), KM_SLEEP); 8169 8170 if (vio_ver_is_supported(vdc->ver, 1, 1)) { 8171 vdc->minfo->dki_media_type = 8172 VD_MEDIATYPE2DK_MEDIATYPE(vdc->vdisk_media); 8173 } else { 8174 vdc->minfo->dki_media_type = DK_FIXED_DISK; 8175 } 8176 8177 vdc->minfo->dki_capacity = vdc->vdisk_size; 8178 vdc->minfo->dki_lbsize = vdc->vdisk_bsize; 8179 } 8180 8181 static ushort_t 8182 vdc_lbl2cksum(struct dk_label *label) 8183 { 8184 int count; 8185 ushort_t sum, *sp; 8186 8187 count = (sizeof (struct dk_label)) / (sizeof (short)) - 1; 8188 sp = (ushort_t *)label; 8189 sum = 0; 8190 while (count--) { 8191 sum ^= *sp++; 8192 } 8193 8194 return (sum); 8195 } 8196 8197 static void 8198 vdc_update_size(vdc_t *vdc, size_t dsk_size, size_t blk_size, size_t xfr_size) 8199 { 8200 vd_err_stats_t *stp; 8201 8202 ASSERT(MUTEX_HELD(&vdc->lock)); 8203 ASSERT(xfr_size != 0); 8204 8205 /* 8206 * If the disk size is unknown or sizes are unchanged then don't 8207 * update anything. 8208 */ 8209 if (dsk_size == VD_SIZE_UNKNOWN || dsk_size == 0 || 8210 (blk_size == vdc->vdisk_bsize && dsk_size == vdc->vdisk_size && 8211 xfr_size == vdc->max_xfer_sz)) 8212 return; 8213 8214 /* 8215 * We don't know at compile time what the vDisk server will think 8216 * are good values but we apply a large (arbitrary) upper bound to 8217 * prevent memory exhaustion in vdc if it was allocating a DRing 8218 * based of huge values sent by the server. We probably will never 8219 * exceed this except if the message was garbage. 8220 */ 8221 if ((xfr_size * blk_size) > (PAGESIZE * DEV_BSIZE)) { 8222 DMSG(vdc, 0, "[%d] vds block transfer size too big;" 8223 " using max supported by vdc", vdc->instance); 8224 xfr_size = maxphys / blk_size; 8225 } 8226 8227 vdc->max_xfer_sz = xfr_size; 8228 vdc->vdisk_bsize = blk_size; 8229 vdc->vdisk_size = dsk_size; 8230 8231 stp = (vd_err_stats_t *)vdc->err_stats->ks_data; 8232 stp->vd_capacity.value.ui64 = dsk_size * blk_size; 8233 8234 vdc->minfo->dki_capacity = dsk_size; 8235 vdc->minfo->dki_lbsize = (uint_t)blk_size; 8236 } 8237 8238 /* 8239 * Update information about the VIO block size. The VIO block size is the 8240 * same as the vdisk block size which is stored in vdc->vdisk_bsize so we 8241 * do not store that information again. 8242 * 8243 * However, buf structures will always use a logical block size of 512 bytes 8244 * (DEV_BSIZE) and we will need to convert logical block numbers to VIO block 8245 * numbers for each read or write operation using vdc_strategy(). To speed up 8246 * this conversion, we expect the VIO block size to be a power of 2 and a 8247 * multiple 512 bytes (DEV_BSIZE), and we cache some useful information. 8248 * 8249 * The function return EINVAL if the new VIO block size (blk_size) is not a 8250 * power of 2 or not a multiple of 512 bytes, otherwise it returns 0. 8251 */ 8252 static int 8253 vdc_update_vio_bsize(vdc_t *vdc, uint32_t blk_size) 8254 { 8255 uint32_t ratio, n; 8256 int nshift = 0; 8257 8258 vdc->vio_bmask = 0; 8259 vdc->vio_bshift = 0; 8260 8261 ASSERT(blk_size > 0); 8262 8263 if ((blk_size % DEV_BSIZE) != 0) 8264 return (EINVAL); 8265 8266 ratio = blk_size / DEV_BSIZE; 8267 8268 for (n = ratio; n > 1; n >>= 1) { 8269 if ((n & 0x1) != 0) { 8270 /* blk_size is not a power of 2 */ 8271 return (EINVAL); 8272 } 8273 nshift++; 8274 } 8275 8276 vdc->vio_bshift = nshift; 8277 vdc->vio_bmask = ratio - 1; 8278 8279 return (0); 8280 } 8281 8282 /* 8283 * Function: 8284 * vdc_validate_geometry 8285 * 8286 * Description: 8287 * This routine discovers the label and geometry of the disk. It stores 8288 * the disk label and related information in the vdc structure. If it 8289 * fails to validate the geometry or to discover the disk label then 8290 * the label is marked as unknown (VD_DISK_LABEL_UNK). 8291 * 8292 * Arguments: 8293 * vdc - soft state pointer for this instance of the device driver. 8294 * 8295 * Return Code: 8296 * 0 - success. 8297 * EINVAL - unknown disk label. 8298 * ENOTSUP - geometry not applicable (EFI label). 8299 * EIO - error accessing the disk. 8300 */ 8301 static int 8302 vdc_validate_geometry(vdc_t *vdc) 8303 { 8304 dev_t dev; 8305 int rv, rval; 8306 struct dk_label *label; 8307 struct dk_geom geom; 8308 struct extvtoc vtoc; 8309 efi_gpt_t *gpt; 8310 efi_gpe_t *gpe; 8311 vd_efi_dev_t edev; 8312 8313 ASSERT(vdc != NULL); 8314 ASSERT(vdc->vtoc != NULL && vdc->geom != NULL); 8315 ASSERT(MUTEX_HELD(&vdc->lock)); 8316 8317 mutex_exit(&vdc->lock); 8318 /* 8319 * Check the disk capacity in case it has changed. If that fails then 8320 * we proceed and we will be using the disk size we currently have. 8321 */ 8322 (void) vdc_check_capacity(vdc); 8323 dev = makedevice(ddi_driver_major(vdc->dip), 8324 VD_MAKE_DEV(vdc->instance, 0)); 8325 8326 rv = vd_process_ioctl(dev, DKIOCGGEOM, (caddr_t)&geom, FKIOCTL, &rval); 8327 if (rv == 0) 8328 rv = vd_process_ioctl(dev, DKIOCGEXTVTOC, (caddr_t)&vtoc, 8329 FKIOCTL, &rval); 8330 8331 if (rv == ENOTSUP) { 8332 /* 8333 * If the device does not support VTOC then we try 8334 * to read an EFI label. 8335 * 8336 * We need to know the block size and the disk size to 8337 * be able to read an EFI label. 8338 */ 8339 if (vdc->vdisk_size == 0) { 8340 mutex_enter(&vdc->lock); 8341 vdc_store_label_unk(vdc); 8342 return (EIO); 8343 } 8344 8345 VDC_EFI_DEV_SET(edev, vdc, vd_process_efi_ioctl); 8346 8347 rv = vd_efi_alloc_and_read(&edev, &gpt, &gpe); 8348 8349 if (rv) { 8350 DMSG(vdc, 0, "[%d] Failed to get EFI (err=%d)", 8351 vdc->instance, rv); 8352 mutex_enter(&vdc->lock); 8353 vdc_store_label_unk(vdc); 8354 return (EIO); 8355 } 8356 8357 mutex_enter(&vdc->lock); 8358 vdc_store_label_efi(vdc, gpt, gpe); 8359 vd_efi_free(&edev, gpt, gpe); 8360 return (ENOTSUP); 8361 } 8362 8363 if (rv != 0) { 8364 DMSG(vdc, 0, "[%d] Failed to get VTOC (err=%d)", 8365 vdc->instance, rv); 8366 mutex_enter(&vdc->lock); 8367 vdc_store_label_unk(vdc); 8368 if (rv != EINVAL) 8369 rv = EIO; 8370 return (rv); 8371 } 8372 8373 /* check that geometry and vtoc are valid */ 8374 if (geom.dkg_nhead == 0 || geom.dkg_nsect == 0 || 8375 vtoc.v_sanity != VTOC_SANE) { 8376 mutex_enter(&vdc->lock); 8377 vdc_store_label_unk(vdc); 8378 return (EINVAL); 8379 } 8380 8381 /* 8382 * We have a disk and a valid VTOC. However this does not mean 8383 * that the disk currently have a VTOC label. The returned VTOC may 8384 * be a default VTOC to be used for configuring the disk (this is 8385 * what is done for disk image). So we read the label from the 8386 * beginning of the disk to ensure we really have a VTOC label. 8387 * 8388 * FUTURE: This could be the default way for reading the VTOC 8389 * from the disk as opposed to sending the VD_OP_GET_VTOC 8390 * to the server. This will be the default if vdc is implemented 8391 * ontop of cmlb. 8392 */ 8393 8394 /* 8395 * Single slice disk does not support read using an absolute disk 8396 * offset so we just rely on the DKIOCGVTOC ioctl in that case. 8397 */ 8398 if (vdc->vdisk_type == VD_DISK_TYPE_SLICE) { 8399 mutex_enter(&vdc->lock); 8400 if (vtoc.v_nparts != 1) { 8401 vdc_store_label_unk(vdc); 8402 return (EINVAL); 8403 } 8404 vdc_store_label_vtoc(vdc, &geom, &vtoc); 8405 return (0); 8406 } 8407 8408 if (vtoc.v_nparts != V_NUMPAR) { 8409 mutex_enter(&vdc->lock); 8410 vdc_store_label_unk(vdc); 8411 return (EINVAL); 8412 } 8413 8414 /* 8415 * Most CD/DVDs do not have a disk label and the label is 8416 * generated by the disk driver. So the on-disk label check 8417 * below may fail and we return now to avoid this problem. 8418 */ 8419 if (vdc->vdisk_media == VD_MEDIA_CD || 8420 vdc->vdisk_media == VD_MEDIA_DVD) { 8421 mutex_enter(&vdc->lock); 8422 vdc_store_label_vtoc(vdc, &geom, &vtoc); 8423 return (0); 8424 } 8425 8426 /* 8427 * Read disk label from start of disk 8428 */ 8429 label = kmem_alloc(vdc->vdisk_bsize, KM_SLEEP); 8430 8431 rv = vdc_do_op(vdc, VD_OP_BREAD, (caddr_t)label, vdc->vdisk_bsize, 8432 VD_SLICE_NONE, 0, NULL, VIO_read_dir, VDC_OP_NORMAL); 8433 8434 if (rv != 0 || label->dkl_magic != DKL_MAGIC || 8435 label->dkl_cksum != vdc_lbl2cksum(label)) { 8436 DMSG(vdc, 1, "[%d] Got VTOC with invalid label\n", 8437 vdc->instance); 8438 kmem_free(label, vdc->vdisk_bsize); 8439 mutex_enter(&vdc->lock); 8440 vdc_store_label_unk(vdc); 8441 return (EINVAL); 8442 } 8443 8444 kmem_free(label, vdc->vdisk_bsize); 8445 mutex_enter(&vdc->lock); 8446 vdc_store_label_vtoc(vdc, &geom, &vtoc); 8447 return (0); 8448 } 8449 8450 /* 8451 * Function: 8452 * vdc_validate 8453 * 8454 * Description: 8455 * This routine discovers the label of the disk and create the 8456 * appropriate device nodes if the label has changed. 8457 * 8458 * Arguments: 8459 * vdc - soft state pointer for this instance of the device driver. 8460 * 8461 * Return Code: 8462 * none. 8463 */ 8464 static void 8465 vdc_validate(vdc_t *vdc) 8466 { 8467 vd_disk_label_t old_label; 8468 vd_slice_t old_slice[V_NUMPAR]; 8469 int rv; 8470 8471 ASSERT(!MUTEX_HELD(&vdc->lock)); 8472 8473 mutex_enter(&vdc->lock); 8474 8475 /* save the current label and vtoc */ 8476 old_label = vdc->vdisk_label; 8477 bcopy(vdc->slice, &old_slice, sizeof (vd_slice_t) * V_NUMPAR); 8478 8479 /* check the geometry */ 8480 (void) vdc_validate_geometry(vdc); 8481 8482 /* if the disk label has changed, update device nodes */ 8483 if (vdc->vdisk_type == VD_DISK_TYPE_DISK && 8484 vdc->vdisk_label != old_label) { 8485 8486 if (vdc->vdisk_label == VD_DISK_LABEL_EFI) 8487 rv = vdc_create_device_nodes_efi(vdc); 8488 else 8489 rv = vdc_create_device_nodes_vtoc(vdc); 8490 8491 if (rv != 0) { 8492 DMSG(vdc, 0, "![%d] Failed to update device nodes", 8493 vdc->instance); 8494 } 8495 } 8496 8497 mutex_exit(&vdc->lock); 8498 } 8499 8500 static void 8501 vdc_validate_task(void *arg) 8502 { 8503 vdc_t *vdc = (vdc_t *)arg; 8504 8505 vdc_validate(vdc); 8506 8507 mutex_enter(&vdc->lock); 8508 ASSERT(vdc->validate_pending > 0); 8509 vdc->validate_pending--; 8510 mutex_exit(&vdc->lock); 8511 } 8512 8513 /* 8514 * Function: 8515 * vdc_setup_devid() 8516 * 8517 * Description: 8518 * This routine discovers the devid of a vDisk. It requests the devid of 8519 * the underlying device from the vDisk server, builds an encapsulated 8520 * devid based on the retrieved devid and registers that new devid to 8521 * the vDisk. 8522 * 8523 * Arguments: 8524 * vdc - soft state pointer for this instance of the device driver. 8525 * 8526 * Return Code: 8527 * 0 - A devid was succesfully registered for the vDisk 8528 */ 8529 static int 8530 vdc_setup_devid(vdc_t *vdc) 8531 { 8532 int rv; 8533 vd_devid_t *vd_devid; 8534 size_t bufsize, bufid_len; 8535 ddi_devid_t vdisk_devid; 8536 char *devid_str; 8537 8538 /* 8539 * At first sight, we don't know the size of the devid that the 8540 * server will return but this size will be encoded into the 8541 * reply. So we do a first request using a default size then we 8542 * check if this size was large enough. If not then we do a second 8543 * request with the correct size returned by the server. Note that 8544 * ldc requires size to be 8-byte aligned. 8545 */ 8546 bufsize = P2ROUNDUP(VD_DEVID_SIZE(VD_DEVID_DEFAULT_LEN), 8547 sizeof (uint64_t)); 8548 vd_devid = kmem_zalloc(bufsize, KM_SLEEP); 8549 bufid_len = bufsize - sizeof (vd_efi_t) - 1; 8550 8551 rv = vdc_do_op(vdc, VD_OP_GET_DEVID, (caddr_t)vd_devid, 8552 bufsize, 0, 0, NULL, VIO_both_dir, 0); 8553 8554 DMSG(vdc, 2, "do_op returned %d\n", rv); 8555 8556 if (rv) { 8557 kmem_free(vd_devid, bufsize); 8558 return (rv); 8559 } 8560 8561 if (vd_devid->length > bufid_len) { 8562 /* 8563 * The returned devid is larger than the buffer used. Try again 8564 * with a buffer with the right size. 8565 */ 8566 kmem_free(vd_devid, bufsize); 8567 bufsize = P2ROUNDUP(VD_DEVID_SIZE(vd_devid->length), 8568 sizeof (uint64_t)); 8569 vd_devid = kmem_zalloc(bufsize, KM_SLEEP); 8570 bufid_len = bufsize - sizeof (vd_efi_t) - 1; 8571 8572 rv = vdc_do_sync_op(vdc, VD_OP_GET_DEVID, (caddr_t)vd_devid, 8573 bufsize, 0, 0, VIO_both_dir, B_TRUE); 8574 8575 if (rv) { 8576 kmem_free(vd_devid, bufsize); 8577 return (rv); 8578 } 8579 } 8580 8581 /* 8582 * The virtual disk should have the same device id as the one associated 8583 * with the physical disk it is mapped on, otherwise sharing a disk 8584 * between a LDom and a non-LDom may not work (for example for a shared 8585 * SVM disk set). 8586 * 8587 * The DDI framework does not allow creating a device id with any 8588 * type so we first create a device id of type DEVID_ENCAP and then 8589 * we restore the orignal type of the physical device. 8590 */ 8591 8592 DMSG(vdc, 2, ": devid length = %d\n", vd_devid->length); 8593 8594 /* build an encapsulated devid based on the returned devid */ 8595 if (ddi_devid_init(vdc->dip, DEVID_ENCAP, vd_devid->length, 8596 vd_devid->id, &vdisk_devid) != DDI_SUCCESS) { 8597 DMSG(vdc, 1, "[%d] Fail to created devid\n", vdc->instance); 8598 kmem_free(vd_devid, bufsize); 8599 return (1); 8600 } 8601 8602 DEVID_FORMTYPE((impl_devid_t *)vdisk_devid, vd_devid->type); 8603 8604 ASSERT(ddi_devid_valid(vdisk_devid) == DDI_SUCCESS); 8605 8606 kmem_free(vd_devid, bufsize); 8607 8608 if (vdc->devid != NULL) { 8609 /* check that the devid hasn't changed */ 8610 if (ddi_devid_compare(vdisk_devid, vdc->devid) == 0) { 8611 ddi_devid_free(vdisk_devid); 8612 return (0); 8613 } 8614 8615 cmn_err(CE_WARN, "vdisk@%d backend devid has changed", 8616 vdc->instance); 8617 8618 devid_str = ddi_devid_str_encode(vdc->devid, NULL); 8619 8620 cmn_err(CE_CONT, "vdisk@%d backend initial devid: %s", 8621 vdc->instance, 8622 (devid_str)? devid_str : "<encoding error>"); 8623 8624 if (devid_str) 8625 ddi_devid_str_free(devid_str); 8626 8627 devid_str = ddi_devid_str_encode(vdisk_devid, NULL); 8628 8629 cmn_err(CE_CONT, "vdisk@%d backend current devid: %s", 8630 vdc->instance, 8631 (devid_str)? devid_str : "<encoding error>"); 8632 8633 if (devid_str) 8634 ddi_devid_str_free(devid_str); 8635 8636 ddi_devid_free(vdisk_devid); 8637 return (1); 8638 } 8639 8640 if (ddi_devid_register(vdc->dip, vdisk_devid) != DDI_SUCCESS) { 8641 DMSG(vdc, 1, "[%d] Fail to register devid\n", vdc->instance); 8642 ddi_devid_free(vdisk_devid); 8643 return (1); 8644 } 8645 8646 vdc->devid = vdisk_devid; 8647 8648 return (0); 8649 } 8650 8651 static void 8652 vdc_store_label_efi(vdc_t *vdc, efi_gpt_t *gpt, efi_gpe_t *gpe) 8653 { 8654 int i, nparts; 8655 8656 ASSERT(MUTEX_HELD(&vdc->lock)); 8657 8658 vdc->vdisk_label = VD_DISK_LABEL_EFI; 8659 bzero(vdc->vtoc, sizeof (struct extvtoc)); 8660 bzero(vdc->geom, sizeof (struct dk_geom)); 8661 bzero(vdc->slice, sizeof (vd_slice_t) * V_NUMPAR); 8662 8663 nparts = gpt->efi_gpt_NumberOfPartitionEntries; 8664 8665 for (i = 0; i < nparts && i < VD_EFI_WD_SLICE; i++) { 8666 8667 if (gpe[i].efi_gpe_StartingLBA == 0 && 8668 gpe[i].efi_gpe_EndingLBA == 0) { 8669 continue; 8670 } 8671 8672 vdc->slice[i].start = gpe[i].efi_gpe_StartingLBA; 8673 vdc->slice[i].nblocks = gpe[i].efi_gpe_EndingLBA - 8674 gpe[i].efi_gpe_StartingLBA + 1; 8675 } 8676 8677 ASSERT(vdc->vdisk_size != 0); 8678 vdc->slice[VD_EFI_WD_SLICE].start = 0; 8679 vdc->slice[VD_EFI_WD_SLICE].nblocks = vdc->vdisk_size; 8680 8681 } 8682 8683 static void 8684 vdc_store_label_vtoc(vdc_t *vdc, struct dk_geom *geom, struct extvtoc *vtoc) 8685 { 8686 int i; 8687 8688 ASSERT(MUTEX_HELD(&vdc->lock)); 8689 ASSERT(vdc->vdisk_bsize == vtoc->v_sectorsz); 8690 8691 vdc->vdisk_label = VD_DISK_LABEL_VTOC; 8692 bcopy(vtoc, vdc->vtoc, sizeof (struct extvtoc)); 8693 bcopy(geom, vdc->geom, sizeof (struct dk_geom)); 8694 bzero(vdc->slice, sizeof (vd_slice_t) * V_NUMPAR); 8695 8696 for (i = 0; i < vtoc->v_nparts; i++) { 8697 vdc->slice[i].start = vtoc->v_part[i].p_start; 8698 vdc->slice[i].nblocks = vtoc->v_part[i].p_size; 8699 } 8700 } 8701 8702 static void 8703 vdc_store_label_unk(vdc_t *vdc) 8704 { 8705 ASSERT(MUTEX_HELD(&vdc->lock)); 8706 8707 vdc->vdisk_label = VD_DISK_LABEL_UNK; 8708 bzero(vdc->vtoc, sizeof (struct extvtoc)); 8709 bzero(vdc->geom, sizeof (struct dk_geom)); 8710 bzero(vdc->slice, sizeof (vd_slice_t) * V_NUMPAR); 8711 } 8712