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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * xdf.c - Xen Virtual Block Device Driver 29 * TODO: 30 * - support alternate block size (currently only DEV_BSIZE supported) 31 * - revalidate geometry for removable devices 32 */ 33 34 #include <sys/ddi.h> 35 #include <sys/sunddi.h> 36 #include <sys/conf.h> 37 #include <sys/cmlb.h> 38 #include <sys/dkio.h> 39 #include <sys/promif.h> 40 #include <sys/sysmacros.h> 41 #include <sys/kstat.h> 42 #include <sys/mach_mmu.h> 43 #ifdef XPV_HVM_DRIVER 44 #include <sys/xpv_support.h> 45 #include <sys/sunndi.h> 46 #endif /* XPV_HVM_DRIVER */ 47 #include <public/io/xenbus.h> 48 #include <xen/sys/xenbus_impl.h> 49 #include <xen/sys/xendev.h> 50 #include <sys/gnttab.h> 51 #include <sys/scsi/generic/inquiry.h> 52 #include <xen/io/blkif_impl.h> 53 #include <io/xdf.h> 54 55 #define FLUSH_DISKCACHE 0x1 56 #define WRITE_BARRIER 0x2 57 #define DEFAULT_FLUSH_BLOCK 156 /* block to write to cause a cache flush */ 58 #define USE_WRITE_BARRIER(vdp) \ 59 ((vdp)->xdf_feature_barrier && !(vdp)->xdf_flush_supported) 60 #define USE_FLUSH_DISKCACHE(vdp) \ 61 ((vdp)->xdf_feature_barrier && (vdp)->xdf_flush_supported) 62 #define IS_WRITE_BARRIER(vdp, bp) \ 63 (!IS_READ(bp) && USE_WRITE_BARRIER(vdp) && \ 64 ((bp)->b_un.b_addr == (vdp)->xdf_cache_flush_block)) 65 #define IS_FLUSH_DISKCACHE(bp) \ 66 (!IS_READ(bp) && USE_FLUSH_DISKCACHE(vdp) && ((bp)->b_bcount == 0)) 67 68 static void *vbd_ss; 69 static kmem_cache_t *xdf_vreq_cache; 70 static kmem_cache_t *xdf_gs_cache; 71 static int xdf_maxphys = XB_MAXPHYS; 72 int xdfdebug = 0; 73 extern int do_polled_io; 74 diskaddr_t xdf_flush_block = DEFAULT_FLUSH_BLOCK; 75 int xdf_barrier_flush_disable = 0; 76 77 /* 78 * dev_ops and cb_ops entrypoints 79 */ 80 static int xdf_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 81 static int xdf_attach(dev_info_t *, ddi_attach_cmd_t); 82 static int xdf_detach(dev_info_t *, ddi_detach_cmd_t); 83 static int xdf_reset(dev_info_t *, ddi_reset_cmd_t); 84 static int xdf_open(dev_t *, int, int, cred_t *); 85 static int xdf_close(dev_t, int, int, struct cred *); 86 static int xdf_strategy(struct buf *); 87 static int xdf_read(dev_t, struct uio *, cred_t *); 88 static int xdf_aread(dev_t, struct aio_req *, cred_t *); 89 static int xdf_write(dev_t, struct uio *, cred_t *); 90 static int xdf_awrite(dev_t, struct aio_req *, cred_t *); 91 static int xdf_dump(dev_t, caddr_t, daddr_t, int); 92 static int xdf_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 93 static uint_t xdf_intr(caddr_t); 94 static int xdf_prop_op(dev_t, dev_info_t *, ddi_prop_op_t, int, char *, 95 caddr_t, int *); 96 97 /* 98 * misc private functions 99 */ 100 static int xdf_suspend(dev_info_t *); 101 static int xdf_resume(dev_info_t *); 102 static int xdf_start_connect(xdf_t *); 103 static int xdf_start_disconnect(xdf_t *); 104 static int xdf_post_connect(xdf_t *); 105 static void xdf_post_disconnect(xdf_t *); 106 static void xdf_oe_change(dev_info_t *, ddi_eventcookie_t, void *, void *); 107 static void xdf_iostart(xdf_t *); 108 static void xdf_iofini(xdf_t *, uint64_t, int); 109 static int xdf_prepare_rreq(xdf_t *, struct buf *, blkif_request_t *); 110 static int xdf_drain_io(xdf_t *); 111 static boolean_t xdf_isopen(xdf_t *, int); 112 static int xdf_check_state_transition(xdf_t *, XenbusState); 113 static int xdf_connect(xdf_t *, boolean_t); 114 static int xdf_dmacallback(caddr_t); 115 static void xdf_timeout_handler(void *); 116 static uint_t xdf_iorestart(caddr_t); 117 static v_req_t *vreq_get(xdf_t *, buf_t *); 118 static void vreq_free(xdf_t *, v_req_t *); 119 static int vreq_setup(xdf_t *, v_req_t *); 120 static ge_slot_t *gs_get(xdf_t *, int); 121 static void gs_free(xdf_t *, ge_slot_t *); 122 static grant_ref_t gs_grant(ge_slot_t *, mfn_t); 123 static void unexpectedie(xdf_t *); 124 static void xdfmin(struct buf *); 125 static void xdf_synthetic_pgeom(dev_info_t *, cmlb_geom_t *); 126 extern int xdf_kstat_create(dev_info_t *, char *, int); 127 extern void xdf_kstat_delete(dev_info_t *); 128 129 #if defined(XPV_HVM_DRIVER) 130 static void xdf_hvm_add(dev_info_t *); 131 static void xdf_hvm_rm(dev_info_t *); 132 static void xdf_hvm_init(void); 133 static void xdf_hvm_fini(void); 134 #endif /* XPV_HVM_DRIVER */ 135 136 static struct cb_ops xdf_cbops = { 137 xdf_open, 138 xdf_close, 139 xdf_strategy, 140 nodev, 141 xdf_dump, 142 xdf_read, 143 xdf_write, 144 xdf_ioctl, 145 nodev, 146 nodev, 147 nodev, 148 nochpoll, 149 xdf_prop_op, 150 NULL, 151 D_MP | D_NEW | D_64BIT, 152 CB_REV, 153 xdf_aread, 154 xdf_awrite 155 }; 156 157 struct dev_ops xdf_devops = { 158 DEVO_REV, /* devo_rev */ 159 0, /* devo_refcnt */ 160 xdf_getinfo, /* devo_getinfo */ 161 nulldev, /* devo_identify */ 162 nulldev, /* devo_probe */ 163 xdf_attach, /* devo_attach */ 164 xdf_detach, /* devo_detach */ 165 xdf_reset, /* devo_reset */ 166 &xdf_cbops, /* devo_cb_ops */ 167 (struct bus_ops *)NULL /* devo_bus_ops */ 168 }; 169 170 static struct modldrv modldrv = { 171 &mod_driverops, /* Type of module. This one is a driver */ 172 "virtual block driver", /* short description */ 173 &xdf_devops /* driver specific ops */ 174 }; 175 176 static struct modlinkage xdf_modlinkage = { 177 MODREV_1, (void *)&modldrv, NULL 178 }; 179 180 /* 181 * I/O buffer DMA attributes 182 * Make sure: one DMA window contains BLKIF_MAX_SEGMENTS_PER_REQUEST at most 183 */ 184 static ddi_dma_attr_t xb_dma_attr = { 185 DMA_ATTR_V0, 186 (uint64_t)0, /* lowest address */ 187 (uint64_t)0xffffffffffffffff, /* highest usable address */ 188 (uint64_t)0xffffff, /* DMA counter limit max */ 189 (uint64_t)XB_BSIZE, /* alignment in bytes */ 190 XB_BSIZE - 1, /* bitmap of burst sizes */ 191 XB_BSIZE, /* min transfer */ 192 (uint64_t)XB_MAX_XFER, /* maximum transfer */ 193 (uint64_t)PAGEOFFSET, /* 1 page segment length */ 194 BLKIF_MAX_SEGMENTS_PER_REQUEST, /* maximum number of segments */ 195 XB_BSIZE, /* granularity */ 196 0, /* flags (reserved) */ 197 }; 198 199 static ddi_device_acc_attr_t xc_acc_attr = { 200 DDI_DEVICE_ATTR_V0, 201 DDI_NEVERSWAP_ACC, 202 DDI_STRICTORDER_ACC 203 }; 204 205 /* callbacks from commmon label */ 206 207 int xdf_lb_rdwr(dev_info_t *, uchar_t, void *, diskaddr_t, size_t, void *); 208 int xdf_lb_getinfo(dev_info_t *, int, void *, void *); 209 210 static cmlb_tg_ops_t xdf_lb_ops = { 211 TG_DK_OPS_VERSION_1, 212 xdf_lb_rdwr, 213 xdf_lb_getinfo 214 }; 215 216 int 217 _init(void) 218 { 219 int rc; 220 221 if ((rc = ddi_soft_state_init(&vbd_ss, sizeof (xdf_t), 0)) != 0) 222 return (rc); 223 224 xdf_vreq_cache = kmem_cache_create("xdf_vreq_cache", 225 sizeof (v_req_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 226 xdf_gs_cache = kmem_cache_create("xdf_gs_cache", 227 sizeof (ge_slot_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 228 229 #if defined(XPV_HVM_DRIVER) 230 xdf_hvm_init(); 231 #endif /* XPV_HVM_DRIVER */ 232 233 if ((rc = mod_install(&xdf_modlinkage)) != 0) { 234 #if defined(XPV_HVM_DRIVER) 235 xdf_hvm_fini(); 236 #endif /* XPV_HVM_DRIVER */ 237 kmem_cache_destroy(xdf_vreq_cache); 238 kmem_cache_destroy(xdf_gs_cache); 239 ddi_soft_state_fini(&vbd_ss); 240 return (rc); 241 } 242 243 return (rc); 244 } 245 246 int 247 _fini(void) 248 { 249 250 int err; 251 if ((err = mod_remove(&xdf_modlinkage)) != 0) 252 return (err); 253 254 #if defined(XPV_HVM_DRIVER) 255 xdf_hvm_fini(); 256 #endif /* XPV_HVM_DRIVER */ 257 258 kmem_cache_destroy(xdf_vreq_cache); 259 kmem_cache_destroy(xdf_gs_cache); 260 ddi_soft_state_fini(&vbd_ss); 261 262 return (0); 263 } 264 265 int 266 _info(struct modinfo *modinfop) 267 { 268 return (mod_info(&xdf_modlinkage, modinfop)); 269 } 270 271 /*ARGSUSED*/ 272 static int 273 xdf_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **rp) 274 { 275 int instance; 276 xdf_t *vbdp; 277 278 instance = XDF_INST(getminor((dev_t)arg)); 279 280 switch (cmd) { 281 case DDI_INFO_DEVT2DEVINFO: 282 if ((vbdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) { 283 *rp = NULL; 284 return (DDI_FAILURE); 285 } 286 *rp = vbdp->xdf_dip; 287 return (DDI_SUCCESS); 288 289 case DDI_INFO_DEVT2INSTANCE: 290 *rp = (void *)(uintptr_t)instance; 291 return (DDI_SUCCESS); 292 293 default: 294 return (DDI_FAILURE); 295 } 296 } 297 298 static int 299 xdf_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags, 300 char *name, caddr_t valuep, int *lengthp) 301 { 302 xdf_t *vdp; 303 304 if ((vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(dip))) == NULL) 305 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 306 name, valuep, lengthp)); 307 308 return (cmlb_prop_op(vdp->xdf_vd_lbl, 309 dev, dip, prop_op, mod_flags, name, valuep, lengthp, 310 XDF_PART(getminor(dev)), NULL)); 311 } 312 313 static int 314 xdf_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 315 { 316 xdf_t *vdp; 317 ddi_iblock_cookie_t softibc; 318 int instance; 319 320 xdfdebug = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_NOTPROM, 321 "xdfdebug", 0); 322 323 switch (cmd) { 324 case DDI_ATTACH: 325 break; 326 327 case DDI_RESUME: 328 return (xdf_resume(devi)); 329 330 default: 331 return (DDI_FAILURE); 332 } 333 334 instance = ddi_get_instance(devi); 335 if (ddi_soft_state_zalloc(vbd_ss, instance) != DDI_SUCCESS) 336 return (DDI_FAILURE); 337 338 DPRINTF(DDI_DBG, ("xdf%d: attaching\n", instance)); 339 vdp = ddi_get_soft_state(vbd_ss, instance); 340 ddi_set_driver_private(devi, vdp); 341 vdp->xdf_dip = devi; 342 cv_init(&vdp->xdf_dev_cv, NULL, CV_DEFAULT, NULL); 343 344 if (ddi_get_iblock_cookie(devi, 0, &vdp->xdf_ibc) != DDI_SUCCESS) { 345 cmn_err(CE_WARN, "xdf@%s: failed to get iblock cookie", 346 ddi_get_name_addr(devi)); 347 goto errout0; 348 } 349 mutex_init(&vdp->xdf_dev_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 350 mutex_init(&vdp->xdf_cb_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 351 mutex_init(&vdp->xdf_iostat_lk, NULL, MUTEX_DRIVER, 352 (void *)vdp->xdf_ibc); 353 354 if (ddi_get_soft_iblock_cookie(devi, DDI_SOFTINT_LOW, &softibc) 355 != DDI_SUCCESS) { 356 cmn_err(CE_WARN, "xdf@%s: failed to get softintr iblock cookie", 357 ddi_get_name_addr(devi)); 358 goto errout0; 359 } 360 if (ddi_add_softintr(devi, DDI_SOFTINT_LOW, &vdp->xdf_softintr_id, 361 &softibc, NULL, xdf_iorestart, (caddr_t)vdp) != DDI_SUCCESS) { 362 cmn_err(CE_WARN, "xdf@%s: failed to add softintr", 363 ddi_get_name_addr(devi)); 364 goto errout0; 365 } 366 367 #if !defined(XPV_HVM_DRIVER) 368 /* create kstat for iostat(1M) */ 369 if (xdf_kstat_create(devi, "xdf", instance) != 0) { 370 cmn_err(CE_WARN, "xdf@%s: failed to create kstat", 371 ddi_get_name_addr(devi)); 372 goto errout0; 373 } 374 #endif /* !XPV_HVM_DRIVER */ 375 376 /* driver handles kernel-issued IOCTLs */ 377 if (ddi_prop_create(DDI_DEV_T_NONE, devi, DDI_PROP_CANSLEEP, 378 DDI_KERNEL_IOCTL, NULL, 0) != DDI_PROP_SUCCESS) { 379 cmn_err(CE_WARN, "xdf@%s: cannot create DDI_KERNEL_IOCTL prop", 380 ddi_get_name_addr(devi)); 381 goto errout0; 382 } 383 384 /* 385 * Initialize the physical geometry stucture. Note that currently 386 * we don't know the size of the backend device so the number 387 * of blocks on the device will be initialized to zero. Once 388 * we connect to the backend device we'll update the physical 389 * geometry to reflect the real size of the device. 390 */ 391 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 392 393 /* 394 * create default device minor nodes: non-removable disk 395 * we will adjust minor nodes after we are connected w/ backend 396 */ 397 cmlb_alloc_handle(&vdp->xdf_vd_lbl); 398 if (cmlb_attach(devi, &xdf_lb_ops, DTYPE_DIRECT, 0, 1, 399 DDI_NT_BLOCK_XVMD, 400 #if defined(XPV_HVM_DRIVER) 401 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 402 CMLB_INTERNAL_MINOR_NODES, 403 #else /* !XPV_HVM_DRIVER */ 404 CMLB_FAKE_LABEL_ONE_PARTITION, 405 #endif /* !XPV_HVM_DRIVER */ 406 vdp->xdf_vd_lbl, NULL) != 0) { 407 cmn_err(CE_WARN, "xdf@%s: default cmlb attach failed", 408 ddi_get_name_addr(devi)); 409 goto errout0; 410 } 411 412 /* 413 * We ship with cache-enabled disks 414 */ 415 vdp->xdf_wce = 1; 416 417 mutex_enter(&vdp->xdf_cb_lk); 418 419 /* Watch backend XenbusState change */ 420 if (xvdi_add_event_handler(devi, XS_OE_STATE, 421 xdf_oe_change) != DDI_SUCCESS) { 422 mutex_exit(&vdp->xdf_cb_lk); 423 goto errout0; 424 } 425 426 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 427 cmn_err(CE_WARN, "xdf@%s: start connection failed", 428 ddi_get_name_addr(devi)); 429 (void) xdf_start_disconnect(vdp); 430 mutex_exit(&vdp->xdf_cb_lk); 431 goto errout1; 432 } 433 434 mutex_exit(&vdp->xdf_cb_lk); 435 436 list_create(&vdp->xdf_vreq_act, sizeof (v_req_t), 437 offsetof(v_req_t, v_link)); 438 list_create(&vdp->xdf_gs_act, sizeof (ge_slot_t), 439 offsetof(ge_slot_t, link)); 440 441 #if defined(XPV_HVM_DRIVER) 442 xdf_hvm_add(devi); 443 444 (void) ddi_prop_update_int(DDI_DEV_T_NONE, devi, DDI_NO_AUTODETACH, 1); 445 446 /* 447 * Report our version to dom0. 448 */ 449 if (xenbus_printf(XBT_NULL, "hvmpv/xdf", "version", "%d", 450 HVMPV_XDF_VERS)) 451 cmn_err(CE_WARN, "xdf: couldn't write version\n"); 452 #endif /* XPV_HVM_DRIVER */ 453 454 ddi_report_dev(devi); 455 456 DPRINTF(DDI_DBG, ("xdf%d: attached\n", instance)); 457 458 return (DDI_SUCCESS); 459 460 errout1: 461 xvdi_remove_event_handler(devi, XS_OE_STATE); 462 errout0: 463 if (vdp->xdf_vd_lbl != NULL) { 464 cmlb_detach(vdp->xdf_vd_lbl, NULL); 465 cmlb_free_handle(&vdp->xdf_vd_lbl); 466 vdp->xdf_vd_lbl = NULL; 467 } 468 #if !defined(XPV_HVM_DRIVER) 469 xdf_kstat_delete(devi); 470 #endif /* !XPV_HVM_DRIVER */ 471 if (vdp->xdf_softintr_id != NULL) 472 ddi_remove_softintr(vdp->xdf_softintr_id); 473 if (vdp->xdf_ibc != NULL) { 474 mutex_destroy(&vdp->xdf_cb_lk); 475 mutex_destroy(&vdp->xdf_dev_lk); 476 } 477 cv_destroy(&vdp->xdf_dev_cv); 478 ddi_soft_state_free(vbd_ss, instance); 479 ddi_set_driver_private(devi, NULL); 480 ddi_prop_remove_all(devi); 481 cmn_err(CE_WARN, "xdf@%s: attach failed", ddi_get_name_addr(devi)); 482 return (DDI_FAILURE); 483 } 484 485 static int 486 xdf_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 487 { 488 xdf_t *vdp; 489 int instance; 490 491 switch (cmd) { 492 493 case DDI_PM_SUSPEND: 494 break; 495 496 case DDI_SUSPEND: 497 return (xdf_suspend(devi)); 498 499 case DDI_DETACH: 500 break; 501 502 default: 503 return (DDI_FAILURE); 504 } 505 506 instance = ddi_get_instance(devi); 507 DPRINTF(DDI_DBG, ("xdf%d: detaching\n", instance)); 508 vdp = ddi_get_soft_state(vbd_ss, instance); 509 510 if (vdp == NULL) 511 return (DDI_FAILURE); 512 513 mutex_enter(&vdp->xdf_dev_lk); 514 if (xdf_isopen(vdp, -1)) { 515 mutex_exit(&vdp->xdf_dev_lk); 516 return (DDI_FAILURE); 517 } 518 519 if (vdp->xdf_status != XD_CLOSED) { 520 mutex_exit(&vdp->xdf_dev_lk); 521 return (DDI_FAILURE); 522 } 523 524 #if defined(XPV_HVM_DRIVER) 525 xdf_hvm_rm(devi); 526 #endif /* XPV_HVM_DRIVER */ 527 528 ASSERT(!ISDMACBON(vdp)); 529 mutex_exit(&vdp->xdf_dev_lk); 530 531 if (vdp->xdf_timeout_id != 0) 532 (void) untimeout(vdp->xdf_timeout_id); 533 534 xvdi_remove_event_handler(devi, XS_OE_STATE); 535 536 /* we'll support backend running in domU later */ 537 #ifdef DOMU_BACKEND 538 (void) xvdi_post_event(devi, XEN_HP_REMOVE); 539 #endif 540 541 list_destroy(&vdp->xdf_vreq_act); 542 list_destroy(&vdp->xdf_gs_act); 543 ddi_prop_remove_all(devi); 544 xdf_kstat_delete(devi); 545 ddi_remove_softintr(vdp->xdf_softintr_id); 546 ddi_set_driver_private(devi, NULL); 547 cv_destroy(&vdp->xdf_dev_cv); 548 mutex_destroy(&vdp->xdf_cb_lk); 549 mutex_destroy(&vdp->xdf_dev_lk); 550 if (vdp->xdf_cache_flush_block != NULL) 551 kmem_free(vdp->xdf_flush_mem, 2 * DEV_BSIZE); 552 ddi_soft_state_free(vbd_ss, instance); 553 return (DDI_SUCCESS); 554 } 555 556 static int 557 xdf_suspend(dev_info_t *devi) 558 { 559 xdf_t *vdp; 560 int instance; 561 enum xdf_state st; 562 563 instance = ddi_get_instance(devi); 564 565 if (xdfdebug & SUSRES_DBG) 566 xen_printf("xdf_suspend: xdf#%d\n", instance); 567 568 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 569 return (DDI_FAILURE); 570 571 xvdi_suspend(devi); 572 573 mutex_enter(&vdp->xdf_cb_lk); 574 mutex_enter(&vdp->xdf_dev_lk); 575 st = vdp->xdf_status; 576 /* change status to stop further I/O requests */ 577 if (st == XD_READY) 578 vdp->xdf_status = XD_SUSPEND; 579 mutex_exit(&vdp->xdf_dev_lk); 580 mutex_exit(&vdp->xdf_cb_lk); 581 582 /* make sure no more I/O responses left in the ring buffer */ 583 if ((st == XD_INIT) || (st == XD_READY)) { 584 #ifdef XPV_HVM_DRIVER 585 ec_unbind_evtchn(vdp->xdf_evtchn); 586 xvdi_free_evtchn(devi); 587 #else /* !XPV_HVM_DRIVER */ 588 (void) ddi_remove_intr(devi, 0, NULL); 589 #endif /* !XPV_HVM_DRIVER */ 590 (void) xdf_drain_io(vdp); 591 /* 592 * no need to teardown the ring buffer here 593 * it will be simply re-init'ed during resume when 594 * we call xvdi_alloc_ring 595 */ 596 } 597 598 if (xdfdebug & SUSRES_DBG) 599 xen_printf("xdf_suspend: SUCCESS\n"); 600 601 return (DDI_SUCCESS); 602 } 603 604 /*ARGSUSED*/ 605 static int 606 xdf_resume(dev_info_t *devi) 607 { 608 xdf_t *vdp; 609 int instance; 610 611 instance = ddi_get_instance(devi); 612 if (xdfdebug & SUSRES_DBG) 613 xen_printf("xdf_resume: xdf%d\n", instance); 614 615 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 616 return (DDI_FAILURE); 617 618 mutex_enter(&vdp->xdf_cb_lk); 619 620 if (xvdi_resume(devi) != DDI_SUCCESS) { 621 mutex_exit(&vdp->xdf_cb_lk); 622 return (DDI_FAILURE); 623 } 624 625 mutex_enter(&vdp->xdf_dev_lk); 626 ASSERT(vdp->xdf_status != XD_READY); 627 vdp->xdf_status = XD_UNKNOWN; 628 mutex_exit(&vdp->xdf_dev_lk); 629 630 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 631 mutex_exit(&vdp->xdf_cb_lk); 632 return (DDI_FAILURE); 633 } 634 635 mutex_exit(&vdp->xdf_cb_lk); 636 637 if (xdfdebug & SUSRES_DBG) 638 xen_printf("xdf_resume: done\n"); 639 return (DDI_SUCCESS); 640 } 641 642 /*ARGSUSED*/ 643 static int 644 xdf_reset(dev_info_t *devi, ddi_reset_cmd_t cmd) 645 { 646 xdf_t *vdp; 647 int instance; 648 649 instance = ddi_get_instance(devi); 650 DPRINTF(DDI_DBG, ("xdf%d: resetting\n", instance)); 651 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 652 return (DDI_FAILURE); 653 654 /* 655 * wait for any outstanding I/O to complete 656 */ 657 (void) xdf_drain_io(vdp); 658 659 DPRINTF(DDI_DBG, ("xdf%d: reset complete\n", instance)); 660 return (DDI_SUCCESS); 661 } 662 663 static int 664 xdf_open(dev_t *devp, int flag, int otyp, cred_t *credp) 665 { 666 minor_t minor; 667 xdf_t *vdp; 668 int part; 669 ulong_t parbit; 670 diskaddr_t p_blkct = 0; 671 boolean_t firstopen; 672 boolean_t nodelay; 673 674 minor = getminor(*devp); 675 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 676 return (ENXIO); 677 678 nodelay = (flag & (FNDELAY | FNONBLOCK)); 679 680 DPRINTF(DDI_DBG, ("xdf%d: opening\n", XDF_INST(minor))); 681 682 /* do cv_wait until connected or failed */ 683 mutex_enter(&vdp->xdf_dev_lk); 684 if (!nodelay && (xdf_connect(vdp, B_TRUE) != XD_READY)) { 685 mutex_exit(&vdp->xdf_dev_lk); 686 return (ENXIO); 687 } 688 689 if ((flag & FWRITE) && XD_IS_RO(vdp)) { 690 mutex_exit(&vdp->xdf_dev_lk); 691 return (EROFS); 692 } 693 694 part = XDF_PART(minor); 695 parbit = 1 << part; 696 if ((vdp->xdf_vd_exclopen & parbit) || 697 ((flag & FEXCL) && xdf_isopen(vdp, part))) { 698 mutex_exit(&vdp->xdf_dev_lk); 699 return (EBUSY); 700 } 701 702 /* are we the first one to open this node? */ 703 firstopen = !xdf_isopen(vdp, -1); 704 705 if (otyp == OTYP_LYR) 706 vdp->xdf_vd_lyropen[part]++; 707 708 vdp->xdf_vd_open[otyp] |= parbit; 709 710 if (flag & FEXCL) 711 vdp->xdf_vd_exclopen |= parbit; 712 713 mutex_exit(&vdp->xdf_dev_lk); 714 715 /* force a re-validation */ 716 if (firstopen) 717 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 718 719 /* 720 * check size 721 * ignore CD/DVD which contains a zero-sized s0 722 */ 723 if (!nodelay && !XD_IS_CD(vdp) && 724 ((cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 725 NULL, NULL, NULL, NULL) != 0) || (p_blkct == 0))) { 726 (void) xdf_close(*devp, flag, otyp, credp); 727 return (ENXIO); 728 } 729 730 return (0); 731 } 732 733 /*ARGSUSED*/ 734 static int 735 xdf_close(dev_t dev, int flag, int otyp, struct cred *credp) 736 { 737 minor_t minor; 738 xdf_t *vdp; 739 int part; 740 ulong_t parbit; 741 742 minor = getminor(dev); 743 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 744 return (ENXIO); 745 746 mutex_enter(&vdp->xdf_dev_lk); 747 part = XDF_PART(minor); 748 if (!xdf_isopen(vdp, part)) { 749 mutex_exit(&vdp->xdf_dev_lk); 750 return (ENXIO); 751 } 752 parbit = 1 << part; 753 754 ASSERT((vdp->xdf_vd_open[otyp] & parbit) != 0); 755 if (otyp == OTYP_LYR) { 756 ASSERT(vdp->xdf_vd_lyropen[part] > 0); 757 if (--vdp->xdf_vd_lyropen[part] == 0) 758 vdp->xdf_vd_open[otyp] &= ~parbit; 759 } else { 760 vdp->xdf_vd_open[otyp] &= ~parbit; 761 } 762 vdp->xdf_vd_exclopen &= ~parbit; 763 764 mutex_exit(&vdp->xdf_dev_lk); 765 return (0); 766 } 767 768 static int 769 xdf_strategy(struct buf *bp) 770 { 771 xdf_t *vdp; 772 minor_t minor; 773 diskaddr_t p_blkct, p_blkst; 774 ulong_t nblks; 775 int part; 776 777 minor = getminor(bp->b_edev); 778 part = XDF_PART(minor); 779 780 vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)); 781 if ((vdp == NULL) || !xdf_isopen(vdp, part)) { 782 bioerror(bp, ENXIO); 783 bp->b_resid = bp->b_bcount; 784 biodone(bp); 785 return (0); 786 } 787 788 /* Check for writes to a read only device */ 789 if (!IS_READ(bp) && XD_IS_RO(vdp)) { 790 bioerror(bp, EROFS); 791 bp->b_resid = bp->b_bcount; 792 biodone(bp); 793 return (0); 794 } 795 796 /* Check if this I/O is accessing a partition or the entire disk */ 797 if ((long)bp->b_private == XB_SLICE_NONE) { 798 /* This I/O is using an absolute offset */ 799 p_blkct = vdp->xdf_xdev_nblocks; 800 p_blkst = 0; 801 } else { 802 /* This I/O is using a partition relative offset */ 803 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 804 &p_blkst, NULL, NULL, NULL)) { 805 bioerror(bp, ENXIO); 806 bp->b_resid = bp->b_bcount; 807 biodone(bp); 808 return (0); 809 } 810 } 811 812 /* check for a starting block beyond the disk or partition limit */ 813 if (bp->b_blkno > p_blkct) { 814 DPRINTF(IO_DBG, ("xdf: block %lld exceeds VBD size %"PRIu64, 815 (longlong_t)bp->b_blkno, (uint64_t)p_blkct)); 816 bioerror(bp, EINVAL); 817 bp->b_resid = bp->b_bcount; 818 biodone(bp); 819 return (0); 820 } 821 822 /* Legacy: don't set error flag at this case */ 823 if (bp->b_blkno == p_blkct) { 824 bp->b_resid = bp->b_bcount; 825 biodone(bp); 826 return (0); 827 } 828 829 /* Adjust for partial transfer */ 830 nblks = bp->b_bcount >> XB_BSHIFT; 831 if ((bp->b_blkno + nblks) > p_blkct) { 832 bp->b_resid = ((bp->b_blkno + nblks) - p_blkct) << XB_BSHIFT; 833 bp->b_bcount -= bp->b_resid; 834 } 835 836 DPRINTF(IO_DBG, ("xdf: strategy blk %lld len %lu\n", 837 (longlong_t)bp->b_blkno, (ulong_t)bp->b_bcount)); 838 839 /* Fix up the buf struct */ 840 bp->b_flags |= B_BUSY; 841 bp->av_forw = bp->av_back = NULL; /* not tagged with a v_req */ 842 bp->b_private = (void *)(uintptr_t)p_blkst; 843 844 mutex_enter(&vdp->xdf_dev_lk); 845 if (vdp->xdf_xdev_iostat != NULL) 846 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 847 if (vdp->xdf_f_act == NULL) { 848 vdp->xdf_f_act = vdp->xdf_l_act = bp; 849 } else { 850 vdp->xdf_l_act->av_forw = bp; 851 vdp->xdf_l_act = bp; 852 } 853 mutex_exit(&vdp->xdf_dev_lk); 854 855 xdf_iostart(vdp); 856 if (do_polled_io) 857 (void) xdf_drain_io(vdp); 858 return (0); 859 } 860 861 /*ARGSUSED*/ 862 static int 863 xdf_read(dev_t dev, struct uio *uiop, cred_t *credp) 864 { 865 866 xdf_t *vdp; 867 minor_t minor; 868 diskaddr_t p_blkcnt; 869 int part; 870 871 minor = getminor(dev); 872 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 873 return (ENXIO); 874 875 DPRINTF(IO_DBG, ("xdf: read offset 0x%"PRIx64"\n", 876 (int64_t)uiop->uio_offset)); 877 878 part = XDF_PART(minor); 879 if (!xdf_isopen(vdp, part)) 880 return (ENXIO); 881 882 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 883 NULL, NULL, NULL, NULL)) 884 return (ENXIO); 885 886 if (U_INVAL(uiop)) 887 return (EINVAL); 888 889 return (physio(xdf_strategy, NULL, dev, B_READ, xdfmin, uiop)); 890 } 891 892 /*ARGSUSED*/ 893 static int 894 xdf_write(dev_t dev, struct uio *uiop, cred_t *credp) 895 { 896 xdf_t *vdp; 897 minor_t minor; 898 diskaddr_t p_blkcnt; 899 int part; 900 901 minor = getminor(dev); 902 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 903 return (ENXIO); 904 905 DPRINTF(IO_DBG, ("xdf: write offset 0x%"PRIx64"\n", 906 (int64_t)uiop->uio_offset)); 907 908 part = XDF_PART(minor); 909 if (!xdf_isopen(vdp, part)) 910 return (ENXIO); 911 912 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 913 NULL, NULL, NULL, NULL)) 914 return (ENXIO); 915 916 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 917 return (ENOSPC); 918 919 if (U_INVAL(uiop)) 920 return (EINVAL); 921 922 return (physio(xdf_strategy, NULL, dev, B_WRITE, minphys, uiop)); 923 } 924 925 /*ARGSUSED*/ 926 static int 927 xdf_aread(dev_t dev, struct aio_req *aiop, cred_t *credp) 928 { 929 xdf_t *vdp; 930 minor_t minor; 931 struct uio *uiop = aiop->aio_uio; 932 diskaddr_t p_blkcnt; 933 int part; 934 935 minor = getminor(dev); 936 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 937 return (ENXIO); 938 939 part = XDF_PART(minor); 940 if (!xdf_isopen(vdp, part)) 941 return (ENXIO); 942 943 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 944 NULL, NULL, NULL, NULL)) 945 return (ENXIO); 946 947 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 948 return (ENOSPC); 949 950 if (U_INVAL(uiop)) 951 return (EINVAL); 952 953 return (aphysio(xdf_strategy, anocancel, dev, B_READ, minphys, aiop)); 954 } 955 956 /*ARGSUSED*/ 957 static int 958 xdf_awrite(dev_t dev, struct aio_req *aiop, cred_t *credp) 959 { 960 xdf_t *vdp; 961 minor_t minor; 962 struct uio *uiop = aiop->aio_uio; 963 diskaddr_t p_blkcnt; 964 int part; 965 966 minor = getminor(dev); 967 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 968 return (ENXIO); 969 970 part = XDF_PART(minor); 971 if (!xdf_isopen(vdp, part)) 972 return (ENXIO); 973 974 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 975 NULL, NULL, NULL, NULL)) 976 return (ENXIO); 977 978 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 979 return (ENOSPC); 980 981 if (U_INVAL(uiop)) 982 return (EINVAL); 983 984 return (aphysio(xdf_strategy, anocancel, dev, B_WRITE, minphys, aiop)); 985 } 986 987 static int 988 xdf_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) 989 { 990 struct buf dumpbuf, *dbp; 991 xdf_t *vdp; 992 minor_t minor; 993 int err = 0; 994 int part; 995 diskaddr_t p_blkcnt, p_blkst; 996 997 minor = getminor(dev); 998 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 999 return (ENXIO); 1000 1001 DPRINTF(IO_DBG, ("xdf: dump addr (0x%p) blk (%ld) nblks (%d)\n", 1002 addr, blkno, nblk)); 1003 1004 part = XDF_PART(minor); 1005 if (!xdf_isopen(vdp, part)) 1006 return (ENXIO); 1007 1008 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, &p_blkst, 1009 NULL, NULL, NULL)) 1010 return (ENXIO); 1011 1012 if ((blkno + nblk) > p_blkcnt) { 1013 cmn_err(CE_WARN, "xdf: block %ld exceeds VBD size %"PRIu64, 1014 blkno + nblk, (uint64_t)p_blkcnt); 1015 return (EINVAL); 1016 } 1017 1018 dbp = &dumpbuf; 1019 bioinit(dbp); 1020 dbp->b_flags = B_BUSY; 1021 dbp->b_un.b_addr = addr; 1022 dbp->b_bcount = nblk << DEV_BSHIFT; 1023 dbp->b_blkno = blkno; 1024 dbp->b_edev = dev; 1025 dbp->b_private = (void *)(uintptr_t)p_blkst; 1026 1027 mutex_enter(&vdp->xdf_dev_lk); 1028 if (vdp->xdf_xdev_iostat != NULL) 1029 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1030 if (vdp->xdf_f_act == NULL) { 1031 vdp->xdf_f_act = vdp->xdf_l_act = dbp; 1032 } else { 1033 vdp->xdf_l_act->av_forw = dbp; 1034 vdp->xdf_l_act = dbp; 1035 } 1036 dbp->av_forw = NULL; 1037 dbp->av_back = NULL; 1038 mutex_exit(&vdp->xdf_dev_lk); 1039 xdf_iostart(vdp); 1040 err = xdf_drain_io(vdp); 1041 biofini(dbp); 1042 return (err); 1043 } 1044 1045 /*ARGSUSED*/ 1046 static int 1047 xdf_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 1048 int *rvalp) 1049 { 1050 int instance; 1051 xdf_t *vdp; 1052 minor_t minor; 1053 int part; 1054 1055 minor = getminor(dev); 1056 instance = XDF_INST(minor); 1057 1058 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 1059 return (ENXIO); 1060 1061 DPRINTF(IOCTL_DBG, ("xdf%d:ioctl: cmd %d (0x%x)\n", 1062 instance, cmd, cmd)); 1063 1064 part = XDF_PART(minor); 1065 if (!xdf_isopen(vdp, part)) 1066 return (ENXIO); 1067 1068 switch (cmd) { 1069 case DKIOCGMEDIAINFO: { 1070 struct dk_minfo media_info; 1071 1072 media_info.dki_lbsize = DEV_BSIZE; 1073 media_info.dki_capacity = vdp->xdf_pgeom.g_capacity; 1074 media_info.dki_media_type = DK_FIXED_DISK; 1075 1076 if (ddi_copyout(&media_info, (void *)arg, 1077 sizeof (struct dk_minfo), mode)) { 1078 return (EFAULT); 1079 } else { 1080 return (0); 1081 } 1082 } 1083 1084 case DKIOCINFO: { 1085 struct dk_cinfo info; 1086 1087 /* controller information */ 1088 if (XD_IS_CD(vdp)) 1089 info.dki_ctype = DKC_CDROM; 1090 else 1091 info.dki_ctype = DKC_VBD; 1092 1093 info.dki_cnum = 0; 1094 (void) strncpy((char *)(&info.dki_cname), "xdf", 8); 1095 1096 /* unit information */ 1097 info.dki_unit = ddi_get_instance(vdp->xdf_dip); 1098 (void) strncpy((char *)(&info.dki_dname), "xdf", 8); 1099 info.dki_flags = DKI_FMTVOL; 1100 info.dki_partition = part; 1101 info.dki_maxtransfer = maxphys / DEV_BSIZE; 1102 info.dki_addr = 0; 1103 info.dki_space = 0; 1104 info.dki_prio = 0; 1105 info.dki_vec = 0; 1106 1107 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode)) 1108 return (EFAULT); 1109 else 1110 return (0); 1111 } 1112 1113 case DKIOCSTATE: { 1114 enum dkio_state dkstate = DKIO_INSERTED; 1115 if (ddi_copyout(&dkstate, (void *)arg, sizeof (dkstate), 1116 mode) != 0) 1117 return (EFAULT); 1118 return (0); 1119 } 1120 1121 /* 1122 * is media removable? 1123 */ 1124 case DKIOCREMOVABLE: { 1125 int i = XD_IS_RM(vdp) ? 1 : 0; 1126 if (ddi_copyout(&i, (caddr_t)arg, sizeof (int), mode)) 1127 return (EFAULT); 1128 return (0); 1129 } 1130 1131 case DKIOCG_PHYGEOM: 1132 case DKIOCG_VIRTGEOM: 1133 case DKIOCGGEOM: 1134 case DKIOCSGEOM: 1135 case DKIOCGAPART: 1136 case DKIOCSAPART: 1137 case DKIOCGVTOC: 1138 case DKIOCSVTOC: 1139 case DKIOCPARTINFO: 1140 case DKIOCGEXTVTOC: 1141 case DKIOCSEXTVTOC: 1142 case DKIOCEXTPARTINFO: 1143 case DKIOCGMBOOT: 1144 case DKIOCSMBOOT: 1145 case DKIOCGETEFI: 1146 case DKIOCSETEFI: 1147 case DKIOCPARTITION: { 1148 int rc; 1149 1150 rc = cmlb_ioctl(vdp->xdf_vd_lbl, dev, cmd, arg, mode, credp, 1151 rvalp, NULL); 1152 return (rc); 1153 } 1154 1155 case DKIOCGETWCE: 1156 if (ddi_copyout(&vdp->xdf_wce, (void *)arg, 1157 sizeof (vdp->xdf_wce), mode)) 1158 return (EFAULT); 1159 return (0); 1160 case DKIOCSETWCE: 1161 if (ddi_copyin((void *)arg, &vdp->xdf_wce, 1162 sizeof (vdp->xdf_wce), mode)) 1163 return (EFAULT); 1164 return (0); 1165 case DKIOCFLUSHWRITECACHE: { 1166 int rc; 1167 struct dk_callback *dkc = (struct dk_callback *)arg; 1168 1169 if (vdp->xdf_flush_supported) { 1170 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1171 NULL, 0, 0, (void *)dev); 1172 } else if (vdp->xdf_feature_barrier && 1173 !xdf_barrier_flush_disable) { 1174 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1175 vdp->xdf_cache_flush_block, xdf_flush_block, 1176 DEV_BSIZE, (void *)dev); 1177 } else { 1178 return (ENOTTY); 1179 } 1180 if ((mode & FKIOCTL) && (dkc != NULL) && 1181 (dkc->dkc_callback != NULL)) { 1182 (*dkc->dkc_callback)(dkc->dkc_cookie, rc); 1183 /* need to return 0 after calling callback */ 1184 rc = 0; 1185 } 1186 return (rc); 1187 } 1188 1189 default: 1190 return (ENOTTY); 1191 } 1192 } 1193 1194 /* 1195 * xdf interrupt handler 1196 */ 1197 static uint_t 1198 xdf_intr(caddr_t arg) 1199 { 1200 xdf_t *vdp = (xdf_t *)arg; 1201 xendev_ring_t *xbr; 1202 blkif_response_t *resp; 1203 int bioerr; 1204 uint64_t id; 1205 extern int do_polled_io; 1206 uint8_t op; 1207 uint16_t status; 1208 ddi_acc_handle_t acchdl; 1209 1210 mutex_enter(&vdp->xdf_dev_lk); 1211 1212 if ((xbr = vdp->xdf_xb_ring) == NULL) { 1213 mutex_exit(&vdp->xdf_dev_lk); 1214 return (DDI_INTR_UNCLAIMED); 1215 } 1216 1217 acchdl = vdp->xdf_xb_ring_hdl; 1218 1219 /* 1220 * complete all requests which have a response 1221 */ 1222 while (resp = xvdi_ring_get_response(xbr)) { 1223 id = ddi_get64(acchdl, &resp->id); 1224 op = ddi_get8(acchdl, &resp->operation); 1225 status = ddi_get16(acchdl, (uint16_t *)&resp->status); 1226 DPRINTF(INTR_DBG, ("resp: op %d id %"PRIu64" status %d\n", 1227 op, id, status)); 1228 1229 /* 1230 * XXPV - close connection to the backend and restart 1231 */ 1232 if (status != BLKIF_RSP_OKAY) { 1233 DPRINTF(IO_DBG, ("xdf@%s: I/O error while %s", 1234 ddi_get_name_addr(vdp->xdf_dip), 1235 (op == BLKIF_OP_READ) ? "reading" : "writing")); 1236 bioerr = EIO; 1237 } else { 1238 bioerr = 0; 1239 } 1240 1241 xdf_iofini(vdp, id, bioerr); 1242 } 1243 1244 mutex_exit(&vdp->xdf_dev_lk); 1245 1246 if (!do_polled_io) 1247 xdf_iostart(vdp); 1248 1249 return (DDI_INTR_CLAIMED); 1250 } 1251 1252 int xdf_fbrewrites; /* how many times was our flush block rewritten */ 1253 1254 /* 1255 * Snarf new data if our flush block was re-written 1256 */ 1257 static void 1258 check_fbwrite(xdf_t *vdp, buf_t *bp, daddr_t blkno) 1259 { 1260 int nblks; 1261 boolean_t mapin; 1262 1263 if (IS_WRITE_BARRIER(vdp, bp)) 1264 return; /* write was a flush write */ 1265 1266 mapin = B_FALSE; 1267 nblks = bp->b_bcount >> DEV_BSHIFT; 1268 if (xdf_flush_block >= blkno && xdf_flush_block < (blkno + nblks)) { 1269 xdf_fbrewrites++; 1270 if (bp->b_flags & (B_PAGEIO | B_PHYS)) { 1271 mapin = B_TRUE; 1272 bp_mapin(bp); 1273 } 1274 bcopy(bp->b_un.b_addr + 1275 ((xdf_flush_block - blkno) << DEV_BSHIFT), 1276 vdp->xdf_cache_flush_block, DEV_BSIZE); 1277 if (mapin) 1278 bp_mapout(bp); 1279 } 1280 } 1281 1282 static void 1283 xdf_iofini(xdf_t *vdp, uint64_t id, int bioerr) 1284 { 1285 ge_slot_t *gs = (ge_slot_t *)(uintptr_t)id; 1286 v_req_t *vreq = gs->vreq; 1287 buf_t *bp = vreq->v_buf; 1288 1289 gs_free(vdp, gs); 1290 if (bioerr) 1291 bioerror(bp, bioerr); 1292 vreq->v_nslots--; 1293 if (vreq->v_nslots != 0) 1294 return; 1295 1296 XDF_UPDATE_IO_STAT(vdp, bp); 1297 if (vdp->xdf_xdev_iostat != NULL) 1298 kstat_runq_exit(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1299 1300 if (IS_ERROR(bp)) 1301 bp->b_resid = bp->b_bcount; 1302 1303 vreq_free(vdp, vreq); 1304 biodone(bp); 1305 } 1306 1307 /* 1308 * return value of xdf_prepare_rreq() 1309 * used in xdf_iostart() 1310 */ 1311 #define XF_PARTIAL 0 /* rreq is full, not all I/O in buf transferred */ 1312 #define XF_COMP 1 /* no more I/O left in buf */ 1313 1314 static void 1315 xdf_iostart(xdf_t *vdp) 1316 { 1317 xendev_ring_t *xbr; 1318 struct buf *bp; 1319 blkif_request_t *rreq; 1320 int retval; 1321 int rreqready = 0; 1322 1323 xbr = vdp->xdf_xb_ring; 1324 1325 /* 1326 * populate the ring request(s) 1327 * 1328 * loop until there is no buf to transfer or no free slot 1329 * available in I/O ring 1330 */ 1331 mutex_enter(&vdp->xdf_dev_lk); 1332 1333 for (;;) { 1334 if (vdp->xdf_status != XD_READY) 1335 break; 1336 1337 /* active buf queue empty? */ 1338 if ((bp = vdp->xdf_f_act) == NULL) 1339 break; 1340 1341 /* try to grab a vreq for this bp */ 1342 if ((BP2VREQ(bp) == NULL) && (vreq_get(vdp, bp) == NULL)) 1343 break; 1344 /* alloc DMA/GTE resources */ 1345 if (vreq_setup(vdp, BP2VREQ(bp)) != DDI_SUCCESS) 1346 break; 1347 1348 /* get next blkif_request in the ring */ 1349 if ((rreq = xvdi_ring_get_request(xbr)) == NULL) 1350 break; 1351 bzero(rreq, sizeof (blkif_request_t)); 1352 1353 /* populate blkif_request with this buf */ 1354 rreqready++; 1355 retval = xdf_prepare_rreq(vdp, bp, rreq); 1356 if (retval == XF_COMP) { 1357 /* finish this bp, switch to next one */ 1358 if (vdp->xdf_xdev_iostat != NULL) 1359 kstat_waitq_to_runq( 1360 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1361 vdp->xdf_f_act = bp->av_forw; 1362 bp->av_forw = NULL; 1363 } 1364 } 1365 1366 /* 1367 * Send the request(s) to the backend 1368 */ 1369 if (rreqready) { 1370 if (xvdi_ring_push_request(xbr)) { 1371 DPRINTF(IO_DBG, ("xdf_iostart: " 1372 "sent request(s) to backend\n")); 1373 xvdi_notify_oe(vdp->xdf_dip); 1374 } 1375 } 1376 1377 mutex_exit(&vdp->xdf_dev_lk); 1378 } 1379 1380 /* 1381 * populate a single blkif_request_t w/ a buf 1382 */ 1383 static int 1384 xdf_prepare_rreq(xdf_t *vdp, struct buf *bp, blkif_request_t *rreq) 1385 { 1386 int rval; 1387 grant_ref_t gr; 1388 uint8_t fsect, lsect; 1389 size_t bcnt; 1390 paddr_t dma_addr; 1391 off_t blk_off; 1392 dev_info_t *dip = vdp->xdf_dip; 1393 blkif_vdev_t vdev = xvdi_get_vdevnum(dip); 1394 v_req_t *vreq = BP2VREQ(bp); 1395 uint64_t blkno = vreq->v_blkno; 1396 uint_t ndmacs = vreq->v_ndmacs; 1397 ddi_acc_handle_t acchdl = vdp->xdf_xb_ring_hdl; 1398 int seg = 0; 1399 int isread = IS_READ(bp); 1400 1401 if (isread) 1402 ddi_put8(acchdl, &rreq->operation, BLKIF_OP_READ); 1403 else { 1404 switch (vreq->v_flush_diskcache) { 1405 case FLUSH_DISKCACHE: 1406 ddi_put8(acchdl, &rreq->operation, 1407 BLKIF_OP_FLUSH_DISKCACHE); 1408 ddi_put16(acchdl, &rreq->handle, vdev); 1409 ddi_put64(acchdl, &rreq->id, 1410 (uint64_t)(uintptr_t)(vreq->v_gs)); 1411 ddi_put8(acchdl, &rreq->nr_segments, 0); 1412 return (XF_COMP); 1413 case WRITE_BARRIER: 1414 ddi_put8(acchdl, &rreq->operation, 1415 BLKIF_OP_WRITE_BARRIER); 1416 break; 1417 default: 1418 if (!vdp->xdf_wce) 1419 ddi_put8(acchdl, &rreq->operation, 1420 BLKIF_OP_WRITE_BARRIER); 1421 else 1422 ddi_put8(acchdl, &rreq->operation, 1423 BLKIF_OP_WRITE); 1424 break; 1425 } 1426 } 1427 1428 ddi_put16(acchdl, &rreq->handle, vdev); 1429 ddi_put64(acchdl, &rreq->sector_number, blkno); 1430 ddi_put64(acchdl, &rreq->id, (uint64_t)(uintptr_t)(vreq->v_gs)); 1431 1432 /* 1433 * loop until all segments are populated or no more dma cookie in buf 1434 */ 1435 for (;;) { 1436 /* 1437 * Each segment of a blkif request can transfer up to 1438 * one 4K page of data. 1439 */ 1440 bcnt = vreq->v_dmac.dmac_size; 1441 ASSERT(bcnt <= PAGESIZE); 1442 ASSERT((bcnt % XB_BSIZE) == 0); 1443 dma_addr = vreq->v_dmac.dmac_laddress; 1444 blk_off = (uint_t)((paddr_t)XB_SEGOFFSET & dma_addr); 1445 ASSERT((blk_off & XB_BMASK) == 0); 1446 fsect = blk_off >> XB_BSHIFT; 1447 lsect = fsect + (bcnt >> XB_BSHIFT) - 1; 1448 ASSERT(fsect < XB_MAX_SEGLEN / XB_BSIZE && 1449 lsect < XB_MAX_SEGLEN / XB_BSIZE); 1450 DPRINTF(IO_DBG, (" ""seg%d: dmacS %lu blk_off %ld\n", 1451 seg, vreq->v_dmac.dmac_size, blk_off)); 1452 gr = gs_grant(vreq->v_gs, PATOMA(dma_addr) >> PAGESHIFT); 1453 ddi_put32(acchdl, &rreq->seg[seg].gref, gr); 1454 ddi_put8(acchdl, &rreq->seg[seg].first_sect, fsect); 1455 ddi_put8(acchdl, &rreq->seg[seg].last_sect, lsect); 1456 DPRINTF(IO_DBG, (" ""seg%d: fs %d ls %d gr %d dma 0x%"PRIx64 1457 "\n", seg, fsect, lsect, gr, dma_addr)); 1458 1459 blkno += (bcnt >> XB_BSHIFT); 1460 seg++; 1461 ASSERT(seg <= BLKIF_MAX_SEGMENTS_PER_REQUEST); 1462 if (--ndmacs) { 1463 ddi_dma_nextcookie(vreq->v_dmahdl, &vreq->v_dmac); 1464 continue; 1465 } 1466 1467 vreq->v_status = VREQ_DMAWIN_DONE; 1468 vreq->v_blkno = blkno; 1469 if (vreq->v_dmaw + 1 == vreq->v_ndmaws) 1470 /* last win */ 1471 rval = XF_COMP; 1472 else 1473 rval = XF_PARTIAL; 1474 break; 1475 } 1476 ddi_put8(acchdl, &rreq->nr_segments, seg); 1477 DPRINTF(IO_DBG, ("xdf_prepare_rreq: request id=%"PRIx64" ready\n", 1478 rreq->id)); 1479 1480 return (rval); 1481 } 1482 1483 #define XDF_QSEC 50000 /* .005 second */ 1484 #define XDF_POLLCNT 12 /* loop for 12 times before time out */ 1485 1486 static int 1487 xdf_drain_io(xdf_t *vdp) 1488 { 1489 int pollc, rval; 1490 xendev_ring_t *xbr; 1491 1492 if (xdfdebug & SUSRES_DBG) 1493 xen_printf("xdf_drain_io: start\n"); 1494 1495 mutex_enter(&vdp->xdf_dev_lk); 1496 1497 if ((vdp->xdf_status != XD_READY) && (vdp->xdf_status != XD_SUSPEND)) 1498 goto out; 1499 1500 rval = 0; 1501 xbr = vdp->xdf_xb_ring; 1502 ASSERT(xbr != NULL); 1503 1504 for (pollc = 0; pollc < XDF_POLLCNT; pollc++) { 1505 if (xvdi_ring_has_unconsumed_responses(xbr)) { 1506 mutex_exit(&vdp->xdf_dev_lk); 1507 (void) xdf_intr((caddr_t)vdp); 1508 mutex_enter(&vdp->xdf_dev_lk); 1509 } 1510 if (!xvdi_ring_has_incomp_request(xbr)) 1511 goto out; 1512 1513 #ifndef XPV_HVM_DRIVER 1514 (void) HYPERVISOR_yield(); 1515 #endif /* XPV_HVM_DRIVER */ 1516 /* 1517 * file-backed devices can be slow 1518 */ 1519 drv_usecwait(XDF_QSEC << pollc); 1520 } 1521 cmn_err(CE_WARN, "xdf_polled_io: timeout"); 1522 rval = EIO; 1523 out: 1524 mutex_exit(&vdp->xdf_dev_lk); 1525 if (xdfdebug & SUSRES_DBG) 1526 xen_printf("xdf_drain_io: end, err=%d\n", rval); 1527 return (rval); 1528 } 1529 1530 /* ARGSUSED5 */ 1531 int 1532 xdf_lb_rdwr(dev_info_t *devi, uchar_t cmd, void *bufp, 1533 diskaddr_t start, size_t reqlen, void *tg_cookie) 1534 { 1535 xdf_t *vdp; 1536 struct buf *bp; 1537 int err = 0; 1538 1539 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1540 if (vdp == NULL) 1541 return (ENXIO); 1542 1543 if ((start + (reqlen >> DEV_BSHIFT)) > vdp->xdf_pgeom.g_capacity) 1544 return (EINVAL); 1545 1546 bp = getrbuf(KM_SLEEP); 1547 if (cmd == TG_READ) 1548 bp->b_flags = B_BUSY | B_READ; 1549 else 1550 bp->b_flags = B_BUSY | B_WRITE; 1551 bp->b_un.b_addr = bufp; 1552 bp->b_bcount = reqlen; 1553 bp->b_blkno = start; 1554 bp->b_edev = DDI_DEV_T_NONE; /* don't have dev_t */ 1555 1556 mutex_enter(&vdp->xdf_dev_lk); 1557 if (vdp->xdf_xdev_iostat != NULL) 1558 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1559 if (vdp->xdf_f_act == NULL) { 1560 vdp->xdf_f_act = vdp->xdf_l_act = bp; 1561 } else { 1562 vdp->xdf_l_act->av_forw = bp; 1563 vdp->xdf_l_act = bp; 1564 } 1565 mutex_exit(&vdp->xdf_dev_lk); 1566 xdf_iostart(vdp); 1567 err = biowait(bp); 1568 1569 ASSERT(bp->b_flags & B_DONE); 1570 1571 freerbuf(bp); 1572 return (err); 1573 } 1574 1575 /* 1576 * synthetic geometry 1577 */ 1578 #define XDF_NSECTS 256 1579 #define XDF_NHEADS 16 1580 1581 static void 1582 xdf_synthetic_pgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1583 { 1584 xdf_t *vdp; 1585 uint_t ncyl; 1586 1587 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1588 1589 ncyl = vdp->xdf_xdev_nblocks / (XDF_NHEADS * XDF_NSECTS); 1590 1591 geomp->g_ncyl = ncyl == 0 ? 1 : ncyl; 1592 geomp->g_acyl = 0; 1593 geomp->g_nhead = XDF_NHEADS; 1594 geomp->g_secsize = XB_BSIZE; 1595 geomp->g_nsect = XDF_NSECTS; 1596 geomp->g_intrlv = 0; 1597 geomp->g_rpm = 7200; 1598 geomp->g_capacity = vdp->xdf_xdev_nblocks; 1599 } 1600 1601 static int 1602 xdf_lb_getcap(dev_info_t *devi, diskaddr_t *capp) 1603 { 1604 xdf_t *vdp; 1605 1606 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1607 1608 if (vdp == NULL) 1609 return (ENXIO); 1610 1611 mutex_enter(&vdp->xdf_dev_lk); 1612 *capp = vdp->xdf_pgeom.g_capacity; 1613 DPRINTF(LBL_DBG, ("capacity %llu\n", *capp)); 1614 mutex_exit(&vdp->xdf_dev_lk); 1615 return (0); 1616 } 1617 1618 static int 1619 xdf_lb_getpgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1620 { 1621 xdf_t *vdp; 1622 1623 if ((vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi))) == NULL) 1624 return (ENXIO); 1625 *geomp = vdp->xdf_pgeom; 1626 return (0); 1627 } 1628 1629 /* 1630 * No real HBA, no geometry available from it 1631 */ 1632 /*ARGSUSED*/ 1633 static int 1634 xdf_lb_getvgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1635 { 1636 return (EINVAL); 1637 } 1638 1639 static int 1640 xdf_lb_getattribute(dev_info_t *devi, tg_attribute_t *tgattributep) 1641 { 1642 xdf_t *vdp; 1643 1644 if (!(vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)))) 1645 return (ENXIO); 1646 1647 if (XD_IS_RO(vdp)) 1648 tgattributep->media_is_writable = 0; 1649 else 1650 tgattributep->media_is_writable = 1; 1651 return (0); 1652 } 1653 1654 /* ARGSUSED3 */ 1655 int 1656 xdf_lb_getinfo(dev_info_t *devi, int cmd, void *arg, void *tg_cookie) 1657 { 1658 switch (cmd) { 1659 case TG_GETPHYGEOM: 1660 return (xdf_lb_getpgeom(devi, (cmlb_geom_t *)arg)); 1661 case TG_GETVIRTGEOM: 1662 return (xdf_lb_getvgeom(devi, (cmlb_geom_t *)arg)); 1663 case TG_GETCAPACITY: 1664 return (xdf_lb_getcap(devi, (diskaddr_t *)arg)); 1665 case TG_GETBLOCKSIZE: 1666 *(uint32_t *)arg = XB_BSIZE; 1667 return (0); 1668 case TG_GETATTR: 1669 return (xdf_lb_getattribute(devi, (tg_attribute_t *)arg)); 1670 default: 1671 return (ENOTTY); 1672 } 1673 } 1674 1675 /* 1676 * Kick-off connect process 1677 * Status should be XD_UNKNOWN or XD_CLOSED 1678 * On success, status will be changed to XD_INIT 1679 * On error, status won't be changed 1680 */ 1681 static int 1682 xdf_start_connect(xdf_t *vdp) 1683 { 1684 char *xsnode; 1685 grant_ref_t gref; 1686 xenbus_transaction_t xbt; 1687 int rv; 1688 dev_info_t *dip = vdp->xdf_dip; 1689 1690 if ((vdp->xdf_peer = xvdi_get_oeid(dip)) == (domid_t)-1) 1691 goto errout; 1692 1693 if (xvdi_alloc_evtchn(dip) != DDI_SUCCESS) { 1694 cmn_err(CE_WARN, "xdf@%s: failed to alloc event channel", 1695 ddi_get_name_addr(dip)); 1696 goto errout; 1697 } 1698 vdp->xdf_evtchn = xvdi_get_evtchn(dip); 1699 #ifdef XPV_HVM_DRIVER 1700 ec_bind_evtchn_to_handler(vdp->xdf_evtchn, IPL_VBD, xdf_intr, vdp); 1701 #else /* !XPV_HVM_DRIVER */ 1702 if (ddi_add_intr(dip, 0, NULL, NULL, xdf_intr, (caddr_t)vdp) != 1703 DDI_SUCCESS) { 1704 cmn_err(CE_WARN, "xdf_start_connect: xdf@%s: " 1705 "failed to add intr handler", ddi_get_name_addr(dip)); 1706 goto errout1; 1707 } 1708 #endif /* !XPV_HVM_DRIVER */ 1709 1710 if (xvdi_alloc_ring(dip, BLKIF_RING_SIZE, 1711 sizeof (union blkif_sring_entry), &gref, &vdp->xdf_xb_ring) != 1712 DDI_SUCCESS) { 1713 cmn_err(CE_WARN, "xdf@%s: failed to alloc comm ring", 1714 ddi_get_name_addr(dip)); 1715 goto errout2; 1716 } 1717 vdp->xdf_xb_ring_hdl = vdp->xdf_xb_ring->xr_acc_hdl; /* ugly!! */ 1718 1719 /* 1720 * Write into xenstore the info needed by backend 1721 */ 1722 if ((xsnode = xvdi_get_xsname(dip)) == NULL) { 1723 cmn_err(CE_WARN, "xdf@%s: " 1724 "failed to get xenstore node path", 1725 ddi_get_name_addr(dip)); 1726 goto fail_trans; 1727 } 1728 trans_retry: 1729 if (xenbus_transaction_start(&xbt)) { 1730 cmn_err(CE_WARN, "xdf@%s: failed to start transaction", 1731 ddi_get_name_addr(dip)); 1732 xvdi_fatal_error(dip, EIO, "transaction start"); 1733 goto fail_trans; 1734 } 1735 1736 if (rv = xenbus_printf(xbt, xsnode, "ring-ref", "%u", gref)) { 1737 cmn_err(CE_WARN, "xdf@%s: failed to write ring-ref", 1738 ddi_get_name_addr(dip)); 1739 xvdi_fatal_error(dip, rv, "writing ring-ref"); 1740 goto abort_trans; 1741 } 1742 1743 if (rv = xenbus_printf(xbt, xsnode, "event-channel", "%u", 1744 vdp->xdf_evtchn)) { 1745 cmn_err(CE_WARN, "xdf@%s: failed to write event-channel", 1746 ddi_get_name_addr(dip)); 1747 xvdi_fatal_error(dip, rv, "writing event-channel"); 1748 goto abort_trans; 1749 } 1750 1751 /* 1752 * "protocol" is written by the domain builder in the case of PV 1753 * domains. However, it is not written for HVM domains, so let's 1754 * write it here. 1755 */ 1756 if (rv = xenbus_printf(xbt, xsnode, "protocol", "%s", 1757 XEN_IO_PROTO_ABI_NATIVE)) { 1758 cmn_err(CE_WARN, "xdf@%s: failed to write protocol", 1759 ddi_get_name_addr(dip)); 1760 xvdi_fatal_error(dip, rv, "writing protocol"); 1761 goto abort_trans; 1762 } 1763 1764 if ((rv = xvdi_switch_state(dip, xbt, XenbusStateInitialised)) > 0) { 1765 cmn_err(CE_WARN, "xdf@%s: " 1766 "failed to switch state to XenbusStateInitialised", 1767 ddi_get_name_addr(dip)); 1768 xvdi_fatal_error(dip, rv, "writing state"); 1769 goto abort_trans; 1770 } 1771 1772 /* kick-off connect process */ 1773 if (rv = xenbus_transaction_end(xbt, 0)) { 1774 if (rv == EAGAIN) 1775 goto trans_retry; 1776 cmn_err(CE_WARN, "xdf@%s: failed to end transaction", 1777 ddi_get_name_addr(dip)); 1778 xvdi_fatal_error(dip, rv, "completing transaction"); 1779 goto fail_trans; 1780 } 1781 1782 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1783 mutex_enter(&vdp->xdf_dev_lk); 1784 vdp->xdf_status = XD_INIT; 1785 mutex_exit(&vdp->xdf_dev_lk); 1786 1787 return (DDI_SUCCESS); 1788 1789 abort_trans: 1790 (void) xenbus_transaction_end(xbt, 1); 1791 fail_trans: 1792 xvdi_free_ring(vdp->xdf_xb_ring); 1793 errout2: 1794 #ifdef XPV_HVM_DRIVER 1795 ec_unbind_evtchn(vdp->xdf_evtchn); 1796 #else /* !XPV_HVM_DRIVER */ 1797 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 1798 #endif /* !XPV_HVM_DRIVER */ 1799 errout1: 1800 xvdi_free_evtchn(dip); 1801 errout: 1802 cmn_err(CE_WARN, "xdf@%s: fail to kick-off connecting", 1803 ddi_get_name_addr(dip)); 1804 return (DDI_FAILURE); 1805 } 1806 1807 /* 1808 * Kick-off disconnect process 1809 * Status won't be changed 1810 */ 1811 static int 1812 xdf_start_disconnect(xdf_t *vdp) 1813 { 1814 if (xvdi_switch_state(vdp->xdf_dip, XBT_NULL, XenbusStateClosed) > 0) { 1815 cmn_err(CE_WARN, "xdf@%s: fail to kick-off disconnecting", 1816 ddi_get_name_addr(vdp->xdf_dip)); 1817 return (DDI_FAILURE); 1818 } 1819 1820 return (DDI_SUCCESS); 1821 } 1822 1823 int 1824 xdf_get_flush_block(xdf_t *vdp) 1825 { 1826 /* 1827 * Get a DEV_BSIZE aligned bufer 1828 */ 1829 vdp->xdf_flush_mem = kmem_alloc(DEV_BSIZE * 2, KM_SLEEP); 1830 vdp->xdf_cache_flush_block = 1831 (char *)P2ROUNDUP((uintptr_t)(vdp->xdf_flush_mem), DEV_BSIZE); 1832 if (xdf_lb_rdwr(vdp->xdf_dip, TG_READ, vdp->xdf_cache_flush_block, 1833 xdf_flush_block, DEV_BSIZE, NULL) != 0) 1834 return (DDI_FAILURE); 1835 return (DDI_SUCCESS); 1836 } 1837 1838 /* 1839 * Finish other initialization after we've connected to backend 1840 * Status should be XD_INIT before calling this routine 1841 * On success, status should be changed to XD_READY 1842 * On error, status should stay XD_INIT 1843 */ 1844 static int 1845 xdf_post_connect(xdf_t *vdp) 1846 { 1847 int rv; 1848 uint_t len; 1849 char *type; 1850 char *barrier; 1851 dev_info_t *devi = vdp->xdf_dip; 1852 1853 /* 1854 * Determine if feature barrier is supported by backend 1855 */ 1856 if (xenbus_read(XBT_NULL, xvdi_get_oename(devi), 1857 "feature-barrier", (void **)&barrier, &len) == 0) { 1858 vdp->xdf_feature_barrier = 1; 1859 kmem_free(barrier, len); 1860 } else { 1861 cmn_err(CE_NOTE, "xdf@%s: failed to read feature-barrier", 1862 ddi_get_name_addr(vdp->xdf_dip)); 1863 vdp->xdf_feature_barrier = 0; 1864 } 1865 1866 /* probe backend */ 1867 if (rv = xenbus_gather(XBT_NULL, xvdi_get_oename(devi), 1868 "sectors", "%"SCNu64, &vdp->xdf_xdev_nblocks, 1869 "info", "%u", &vdp->xdf_xdev_info, NULL)) { 1870 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1871 "cannot read backend info", ddi_get_name_addr(devi)); 1872 xvdi_fatal_error(devi, rv, "reading backend info"); 1873 return (DDI_FAILURE); 1874 } 1875 1876 /* 1877 * Make sure that the device we're connecting isn't smaller than 1878 * the old connected device. 1879 */ 1880 if (vdp->xdf_xdev_nblocks < vdp->xdf_pgeom.g_capacity) { 1881 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1882 "backend disk device shrank", ddi_get_name_addr(devi)); 1883 /* XXX: call xvdi_fatal_error() here? */ 1884 xvdi_fatal_error(devi, rv, "reading backend info"); 1885 return (DDI_FAILURE); 1886 } 1887 1888 #ifdef _ILP32 1889 if (vdp->xdf_xdev_nblocks > DK_MAX_BLOCKS) { 1890 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1891 "backend disk device too large with %llu blocks for" 1892 " 32-bit kernel", ddi_get_name_addr(devi), 1893 vdp->xdf_xdev_nblocks); 1894 xvdi_fatal_error(devi, rv, "reading backend info"); 1895 return (DDI_FAILURE); 1896 } 1897 #endif 1898 1899 1900 /* 1901 * Only update the physical geometry to reflect the new device 1902 * size if this is the first time we're connecting to the backend 1903 * device. Once we assign a physical geometry to a device it stays 1904 * fixed until: 1905 * - we get detach and re-attached (at which point we 1906 * automatically assign a new physical geometry). 1907 * - someone calls TG_SETPHYGEOM to explicity set the 1908 * physical geometry. 1909 */ 1910 if (vdp->xdf_pgeom.g_capacity == 0) 1911 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 1912 1913 /* fix disk type */ 1914 if (xenbus_read(XBT_NULL, xvdi_get_xsname(devi), "device-type", 1915 (void **)&type, &len) != 0) { 1916 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1917 "cannot read device-type", ddi_get_name_addr(devi)); 1918 xvdi_fatal_error(devi, rv, "reading device-type"); 1919 return (DDI_FAILURE); 1920 } 1921 if (strcmp(type, "cdrom") == 0) 1922 vdp->xdf_xdev_info |= VDISK_CDROM; 1923 kmem_free(type, len); 1924 1925 /* 1926 * We've created all the minor nodes via cmlb_attach() using default 1927 * value in xdf_attach() to make it possible to block in xdf_open(), 1928 * in case there's anyone (say, booting thread) ever trying to open 1929 * it before connected to backend. We will refresh all those minor 1930 * nodes w/ latest info we've got now when we are almost connected. 1931 * 1932 * Don't do this when xdf is already opened by someone (could happen 1933 * during resume), for that cmlb_attach() will invalid the label info 1934 * and confuse those who has already opened the node, which is bad. 1935 */ 1936 if (!xdf_isopen(vdp, -1) && (XD_IS_CD(vdp) || XD_IS_RM(vdp))) { 1937 /* re-init cmlb w/ latest info we got from backend */ 1938 if (cmlb_attach(devi, &xdf_lb_ops, 1939 XD_IS_CD(vdp) ? DTYPE_RODIRECT : DTYPE_DIRECT, 1940 XD_IS_RM(vdp), 1, 1941 XD_IS_CD(vdp) ? DDI_NT_CD_XVMD : DDI_NT_BLOCK_XVMD, 1942 #if defined(XPV_HVM_DRIVER) 1943 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 1944 CMLB_INTERNAL_MINOR_NODES, 1945 #else /* !XPV_HVM_DRIVER */ 1946 CMLB_FAKE_LABEL_ONE_PARTITION, 1947 #endif /* !XPV_HVM_DRIVER */ 1948 vdp->xdf_vd_lbl, NULL) != 0) { 1949 cmn_err(CE_WARN, "xdf@%s: cmlb attach failed", 1950 ddi_get_name_addr(devi)); 1951 return (DDI_FAILURE); 1952 } 1953 } 1954 1955 /* mark vbd is ready for I/O */ 1956 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1957 mutex_enter(&vdp->xdf_dev_lk); 1958 vdp->xdf_status = XD_READY; 1959 mutex_exit(&vdp->xdf_dev_lk); 1960 /* 1961 * If backend has feature-barrier, see if it supports disk 1962 * cache flush op. 1963 */ 1964 vdp->xdf_flush_supported = 0; 1965 if (vdp->xdf_feature_barrier) { 1966 /* 1967 * Pretend we already know flush is supported so probe 1968 * will attempt the correct op. 1969 */ 1970 vdp->xdf_flush_supported = 1; 1971 if (xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, NULL, 0, 0, 0) == 0) { 1972 vdp->xdf_flush_supported = 1; 1973 } else { 1974 vdp->xdf_flush_supported = 0; 1975 /* 1976 * If the other end does not support the cache flush op 1977 * then we must use a barrier-write to force disk 1978 * cache flushing. Barrier writes require that a data 1979 * block actually be written. 1980 * Cache a block to barrier-write when we are 1981 * asked to perform a flush. 1982 * XXX - would it be better to just copy 1 block 1983 * (512 bytes) from whatever write we did last 1984 * and rewrite that block? 1985 */ 1986 if (xdf_get_flush_block(vdp) != DDI_SUCCESS) 1987 return (DDI_FAILURE); 1988 } 1989 } 1990 1991 cmn_err(CE_CONT, "?xdf@%s: %"PRIu64" blocks", ddi_get_name_addr(devi), 1992 (uint64_t)vdp->xdf_xdev_nblocks); 1993 1994 return (DDI_SUCCESS); 1995 } 1996 1997 /* 1998 * Finish other uninitialization after we've disconnected from backend 1999 * when status is XD_CLOSING or XD_INIT. After returns, status is XD_CLOSED 2000 */ 2001 static void 2002 xdf_post_disconnect(xdf_t *vdp) 2003 { 2004 #ifdef XPV_HVM_DRIVER 2005 ec_unbind_evtchn(vdp->xdf_evtchn); 2006 #else /* !XPV_HVM_DRIVER */ 2007 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 2008 #endif /* !XPV_HVM_DRIVER */ 2009 xvdi_free_evtchn(vdp->xdf_dip); 2010 xvdi_free_ring(vdp->xdf_xb_ring); 2011 vdp->xdf_xb_ring = NULL; 2012 vdp->xdf_xb_ring_hdl = NULL; 2013 vdp->xdf_peer = (domid_t)-1; 2014 2015 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 2016 mutex_enter(&vdp->xdf_dev_lk); 2017 vdp->xdf_status = XD_CLOSED; 2018 mutex_exit(&vdp->xdf_dev_lk); 2019 } 2020 2021 /*ARGSUSED*/ 2022 static void 2023 xdf_oe_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) 2024 { 2025 XenbusState new_state = *(XenbusState *)impl_data; 2026 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2027 boolean_t unexpect_die = B_FALSE; 2028 int status; 2029 2030 DPRINTF(DDI_DBG, ("xdf@%s: otherend state change to %d!\n", 2031 ddi_get_name_addr(dip), new_state)); 2032 2033 mutex_enter(&vdp->xdf_cb_lk); 2034 2035 if (xdf_check_state_transition(vdp, new_state) == DDI_FAILURE) { 2036 mutex_exit(&vdp->xdf_cb_lk); 2037 return; 2038 } 2039 2040 switch (new_state) { 2041 case XenbusStateInitialising: 2042 ASSERT(vdp->xdf_status == XD_CLOSED); 2043 /* 2044 * backend recovered from a previous failure, 2045 * kick-off connect process again 2046 */ 2047 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 2048 cmn_err(CE_WARN, "xdf@%s:" 2049 " failed to start reconnecting to backend", 2050 ddi_get_name_addr(dip)); 2051 } 2052 break; 2053 case XenbusStateConnected: 2054 ASSERT(vdp->xdf_status == XD_INIT); 2055 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected); 2056 /* finish final init after connect */ 2057 if (xdf_post_connect(vdp) != DDI_SUCCESS) 2058 (void) xdf_start_disconnect(vdp); 2059 break; 2060 case XenbusStateClosing: 2061 if (vdp->xdf_status == XD_READY) { 2062 mutex_enter(&vdp->xdf_dev_lk); 2063 if (xdf_isopen(vdp, -1)) { 2064 cmn_err(CE_NOTE, "xdf@%s: hot-unplug failed, " 2065 "still in use", ddi_get_name_addr(dip)); 2066 mutex_exit(&vdp->xdf_dev_lk); 2067 break; 2068 } else { 2069 vdp->xdf_status = XD_CLOSING; 2070 } 2071 mutex_exit(&vdp->xdf_dev_lk); 2072 } 2073 (void) xdf_start_disconnect(vdp); 2074 break; 2075 case XenbusStateClosed: 2076 /* first check if BE closed unexpectedly */ 2077 mutex_enter(&vdp->xdf_dev_lk); 2078 if (xdf_isopen(vdp, -1)) { 2079 unexpect_die = B_TRUE; 2080 unexpectedie(vdp); 2081 cmn_err(CE_WARN, "xdf@%s: backend closed, " 2082 "reconnecting...", ddi_get_name_addr(dip)); 2083 } 2084 mutex_exit(&vdp->xdf_dev_lk); 2085 2086 if (vdp->xdf_status == XD_READY) { 2087 mutex_enter(&vdp->xdf_dev_lk); 2088 vdp->xdf_status = XD_CLOSING; 2089 mutex_exit(&vdp->xdf_dev_lk); 2090 2091 #ifdef DOMU_BACKEND 2092 (void) xvdi_post_event(dip, XEN_HP_REMOVE); 2093 #endif 2094 2095 xdf_post_disconnect(vdp); 2096 (void) xvdi_switch_state(dip, XBT_NULL, 2097 XenbusStateClosed); 2098 } else if ((vdp->xdf_status == XD_INIT) || 2099 (vdp->xdf_status == XD_CLOSING)) { 2100 xdf_post_disconnect(vdp); 2101 } else { 2102 mutex_enter(&vdp->xdf_dev_lk); 2103 vdp->xdf_status = XD_CLOSED; 2104 mutex_exit(&vdp->xdf_dev_lk); 2105 } 2106 } 2107 2108 /* notify anybody waiting for oe state change */ 2109 mutex_enter(&vdp->xdf_dev_lk); 2110 cv_broadcast(&vdp->xdf_dev_cv); 2111 mutex_exit(&vdp->xdf_dev_lk); 2112 2113 status = vdp->xdf_status; 2114 mutex_exit(&vdp->xdf_cb_lk); 2115 2116 if (status == XD_READY) { 2117 xdf_iostart(vdp); 2118 } else if ((status == XD_CLOSED) && !unexpect_die) { 2119 /* interface is closed successfully, remove all minor nodes */ 2120 if (vdp->xdf_vd_lbl != NULL) { 2121 cmlb_detach(vdp->xdf_vd_lbl, NULL); 2122 cmlb_free_handle(&vdp->xdf_vd_lbl); 2123 vdp->xdf_vd_lbl = NULL; 2124 } 2125 } 2126 } 2127 2128 /* check if partition is open, -1 - check all partitions on the disk */ 2129 static boolean_t 2130 xdf_isopen(xdf_t *vdp, int partition) 2131 { 2132 int i; 2133 ulong_t parbit; 2134 boolean_t rval = B_FALSE; 2135 2136 ASSERT((partition == -1) || 2137 ((partition >= 0) || (partition < XDF_PEXT))); 2138 2139 if (partition == -1) 2140 parbit = (ulong_t)-1; 2141 else 2142 parbit = 1 << partition; 2143 2144 for (i = 0; i < OTYPCNT; i++) { 2145 if (vdp->xdf_vd_open[i] & parbit) 2146 rval = B_TRUE; 2147 } 2148 2149 return (rval); 2150 } 2151 2152 /* 2153 * Xdf_check_state_transition will check the XenbusState change to see 2154 * if the change is a valid transition or not. 2155 * The new state is written by backend domain, or by running xenstore-write 2156 * to change it manually in dom0 2157 */ 2158 static int 2159 xdf_check_state_transition(xdf_t *vdp, XenbusState oestate) 2160 { 2161 int status; 2162 int stcheck; 2163 #define STOK 0 /* need further process */ 2164 #define STNOP 1 /* no action need taking */ 2165 #define STBUG 2 /* unexpected state change, could be a bug */ 2166 2167 status = vdp->xdf_status; 2168 stcheck = STOK; 2169 2170 switch (status) { 2171 case XD_UNKNOWN: 2172 if ((oestate == XenbusStateUnknown) || 2173 (oestate == XenbusStateConnected)) 2174 stcheck = STBUG; 2175 else if ((oestate == XenbusStateInitialising) || 2176 (oestate == XenbusStateInitWait) || 2177 (oestate == XenbusStateInitialised)) 2178 stcheck = STNOP; 2179 break; 2180 case XD_INIT: 2181 if (oestate == XenbusStateUnknown) 2182 stcheck = STBUG; 2183 else if ((oestate == XenbusStateInitialising) || 2184 (oestate == XenbusStateInitWait) || 2185 (oestate == XenbusStateInitialised)) 2186 stcheck = STNOP; 2187 break; 2188 case XD_READY: 2189 if ((oestate == XenbusStateUnknown) || 2190 (oestate == XenbusStateInitialising) || 2191 (oestate == XenbusStateInitWait) || 2192 (oestate == XenbusStateInitialised)) 2193 stcheck = STBUG; 2194 else if (oestate == XenbusStateConnected) 2195 stcheck = STNOP; 2196 break; 2197 case XD_CLOSING: 2198 if ((oestate == XenbusStateUnknown) || 2199 (oestate == XenbusStateInitialising) || 2200 (oestate == XenbusStateInitWait) || 2201 (oestate == XenbusStateInitialised) || 2202 (oestate == XenbusStateConnected)) 2203 stcheck = STBUG; 2204 else if (oestate == XenbusStateClosing) 2205 stcheck = STNOP; 2206 break; 2207 case XD_CLOSED: 2208 if ((oestate == XenbusStateUnknown) || 2209 (oestate == XenbusStateConnected)) 2210 stcheck = STBUG; 2211 else if ((oestate == XenbusStateInitWait) || 2212 (oestate == XenbusStateInitialised) || 2213 (oestate == XenbusStateClosing) || 2214 (oestate == XenbusStateClosed)) 2215 stcheck = STNOP; 2216 break; 2217 case XD_SUSPEND: 2218 default: 2219 stcheck = STBUG; 2220 } 2221 2222 if (stcheck == STOK) 2223 return (DDI_SUCCESS); 2224 2225 if (stcheck == STBUG) 2226 cmn_err(CE_NOTE, "xdf@%s: unexpected otherend " 2227 "state change to %d!, when status is %d", 2228 ddi_get_name_addr(vdp->xdf_dip), oestate, status); 2229 2230 return (DDI_FAILURE); 2231 } 2232 2233 static int 2234 xdf_connect(xdf_t *vdp, boolean_t wait) 2235 { 2236 ASSERT(mutex_owned(&vdp->xdf_dev_lk)); 2237 while (vdp->xdf_status != XD_READY) { 2238 if (!wait || (vdp->xdf_status > XD_READY)) 2239 break; 2240 2241 if (cv_wait_sig(&vdp->xdf_dev_cv, &vdp->xdf_dev_lk) == 0) 2242 break; 2243 } 2244 2245 return (vdp->xdf_status); 2246 } 2247 2248 /* 2249 * callback func when DMA/GTE resources is available 2250 * 2251 * Note: we only register one callback function to grant table subsystem 2252 * since we only have one 'struct gnttab_free_callback' in xdf_t. 2253 */ 2254 static int 2255 xdf_dmacallback(caddr_t arg) 2256 { 2257 xdf_t *vdp = (xdf_t *)arg; 2258 ASSERT(vdp != NULL); 2259 2260 DPRINTF(DMA_DBG, ("xdf@%s: DMA callback started\n", 2261 ddi_get_name_addr(vdp->xdf_dip))); 2262 2263 ddi_trigger_softintr(vdp->xdf_softintr_id); 2264 return (DDI_DMA_CALLBACK_DONE); 2265 } 2266 2267 static uint_t 2268 xdf_iorestart(caddr_t arg) 2269 { 2270 xdf_t *vdp = (xdf_t *)arg; 2271 2272 ASSERT(vdp != NULL); 2273 2274 mutex_enter(&vdp->xdf_dev_lk); 2275 ASSERT(ISDMACBON(vdp)); 2276 SETDMACBOFF(vdp); 2277 mutex_exit(&vdp->xdf_dev_lk); 2278 2279 xdf_iostart(vdp); 2280 2281 return (DDI_INTR_CLAIMED); 2282 } 2283 2284 static void 2285 xdf_timeout_handler(void *arg) 2286 { 2287 xdf_t *vdp = arg; 2288 2289 mutex_enter(&vdp->xdf_dev_lk); 2290 vdp->xdf_timeout_id = 0; 2291 mutex_exit(&vdp->xdf_dev_lk); 2292 2293 /* new timeout thread could be re-scheduled */ 2294 xdf_iostart(vdp); 2295 } 2296 2297 /* 2298 * Alloc a vreq for this bp 2299 * bp->av_back contains the pointer to the vreq upon return 2300 */ 2301 static v_req_t * 2302 vreq_get(xdf_t *vdp, buf_t *bp) 2303 { 2304 v_req_t *vreq = NULL; 2305 2306 ASSERT(BP2VREQ(bp) == NULL); 2307 2308 vreq = kmem_cache_alloc(xdf_vreq_cache, KM_NOSLEEP); 2309 if (vreq == NULL) { 2310 if (vdp->xdf_timeout_id == 0) 2311 /* restart I/O after one second */ 2312 vdp->xdf_timeout_id = 2313 timeout(xdf_timeout_handler, vdp, hz); 2314 return (NULL); 2315 } 2316 bzero(vreq, sizeof (v_req_t)); 2317 2318 list_insert_head(&vdp->xdf_vreq_act, (void *)vreq); 2319 bp->av_back = (buf_t *)vreq; 2320 vreq->v_buf = bp; 2321 vreq->v_status = VREQ_INIT; 2322 /* init of other fields in vreq is up to the caller */ 2323 2324 return (vreq); 2325 } 2326 2327 static void 2328 vreq_free(xdf_t *vdp, v_req_t *vreq) 2329 { 2330 buf_t *bp = vreq->v_buf; 2331 2332 list_remove(&vdp->xdf_vreq_act, (void *)vreq); 2333 2334 if (vreq->v_flush_diskcache == FLUSH_DISKCACHE) 2335 goto done; 2336 2337 switch (vreq->v_status) { 2338 case VREQ_DMAWIN_DONE: 2339 case VREQ_GS_ALLOCED: 2340 case VREQ_DMABUF_BOUND: 2341 (void) ddi_dma_unbind_handle(vreq->v_dmahdl); 2342 /*FALLTHRU*/ 2343 case VREQ_DMAMEM_ALLOCED: 2344 if (!ALIGNED_XFER(bp)) { 2345 ASSERT(vreq->v_abuf != NULL); 2346 if (!IS_ERROR(bp) && IS_READ(bp)) 2347 bcopy(vreq->v_abuf, bp->b_un.b_addr, 2348 bp->b_bcount); 2349 ddi_dma_mem_free(&vreq->v_align); 2350 } 2351 /*FALLTHRU*/ 2352 case VREQ_MEMDMAHDL_ALLOCED: 2353 if (!ALIGNED_XFER(bp)) 2354 ddi_dma_free_handle(&vreq->v_memdmahdl); 2355 /*FALLTHRU*/ 2356 case VREQ_DMAHDL_ALLOCED: 2357 ddi_dma_free_handle(&vreq->v_dmahdl); 2358 break; 2359 default: 2360 break; 2361 } 2362 done: 2363 vreq->v_buf->av_back = NULL; 2364 kmem_cache_free(xdf_vreq_cache, vreq); 2365 } 2366 2367 /* 2368 * Initalize the DMA and grant table resources for the buf 2369 */ 2370 static int 2371 vreq_setup(xdf_t *vdp, v_req_t *vreq) 2372 { 2373 int rc; 2374 ddi_dma_attr_t dmaattr; 2375 uint_t ndcs, ndws; 2376 ddi_dma_handle_t dh; 2377 ddi_dma_handle_t mdh; 2378 ddi_dma_cookie_t dc; 2379 ddi_acc_handle_t abh; 2380 caddr_t aba; 2381 ge_slot_t *gs; 2382 size_t bufsz; 2383 off_t off; 2384 size_t sz; 2385 buf_t *bp = vreq->v_buf; 2386 int dma_flags = (IS_READ(bp) ? DDI_DMA_READ : DDI_DMA_WRITE) | 2387 DDI_DMA_STREAMING | DDI_DMA_PARTIAL; 2388 2389 switch (vreq->v_status) { 2390 case VREQ_INIT: 2391 if (IS_FLUSH_DISKCACHE(bp)) { 2392 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2393 DPRINTF(DMA_DBG, ( 2394 "xdf@%s: get ge_slotfailed\n", 2395 ddi_get_name_addr(vdp->xdf_dip))); 2396 return (DDI_FAILURE); 2397 } 2398 vreq->v_blkno = 0; 2399 vreq->v_nslots = 1; 2400 vreq->v_gs = gs; 2401 vreq->v_flush_diskcache = FLUSH_DISKCACHE; 2402 vreq->v_status = VREQ_GS_ALLOCED; 2403 gs->vreq = vreq; 2404 return (DDI_SUCCESS); 2405 } 2406 2407 if (IS_WRITE_BARRIER(vdp, bp)) 2408 vreq->v_flush_diskcache = WRITE_BARRIER; 2409 vreq->v_blkno = bp->b_blkno + 2410 (diskaddr_t)(uintptr_t)bp->b_private; 2411 bp->b_private = NULL; 2412 /* See if we wrote new data to our flush block */ 2413 if (!IS_READ(bp) && USE_WRITE_BARRIER(vdp)) 2414 check_fbwrite(vdp, bp, vreq->v_blkno); 2415 vreq->v_status = VREQ_INIT_DONE; 2416 /*FALLTHRU*/ 2417 2418 case VREQ_INIT_DONE: 2419 /* 2420 * alloc DMA handle 2421 */ 2422 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &xb_dma_attr, 2423 xdf_dmacallback, (caddr_t)vdp, &dh); 2424 if (rc != DDI_SUCCESS) { 2425 SETDMACBON(vdp); 2426 DPRINTF(DMA_DBG, ("xdf@%s: DMA handle alloc failed\n", 2427 ddi_get_name_addr(vdp->xdf_dip))); 2428 return (DDI_FAILURE); 2429 } 2430 2431 vreq->v_dmahdl = dh; 2432 vreq->v_status = VREQ_DMAHDL_ALLOCED; 2433 /*FALLTHRU*/ 2434 2435 case VREQ_DMAHDL_ALLOCED: 2436 /* 2437 * alloc dma handle for 512-byte aligned buf 2438 */ 2439 if (!ALIGNED_XFER(bp)) { 2440 /* 2441 * XXPV: we need to temporarily enlarge the seg 2442 * boundary and s/g length to work round CR6381968 2443 */ 2444 dmaattr = xb_dma_attr; 2445 dmaattr.dma_attr_seg = (uint64_t)-1; 2446 dmaattr.dma_attr_sgllen = INT_MAX; 2447 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &dmaattr, 2448 xdf_dmacallback, (caddr_t)vdp, &mdh); 2449 if (rc != DDI_SUCCESS) { 2450 SETDMACBON(vdp); 2451 DPRINTF(DMA_DBG, ("xdf@%s: unaligned buf DMA" 2452 "handle alloc failed\n", 2453 ddi_get_name_addr(vdp->xdf_dip))); 2454 return (DDI_FAILURE); 2455 } 2456 vreq->v_memdmahdl = mdh; 2457 vreq->v_status = VREQ_MEMDMAHDL_ALLOCED; 2458 } 2459 /*FALLTHRU*/ 2460 2461 case VREQ_MEMDMAHDL_ALLOCED: 2462 /* 2463 * alloc 512-byte aligned buf 2464 */ 2465 if (!ALIGNED_XFER(bp)) { 2466 if (bp->b_flags & (B_PAGEIO | B_PHYS)) 2467 bp_mapin(bp); 2468 2469 rc = ddi_dma_mem_alloc(vreq->v_memdmahdl, 2470 roundup(bp->b_bcount, XB_BSIZE), &xc_acc_attr, 2471 DDI_DMA_STREAMING, xdf_dmacallback, (caddr_t)vdp, 2472 &aba, &bufsz, &abh); 2473 if (rc != DDI_SUCCESS) { 2474 SETDMACBON(vdp); 2475 DPRINTF(DMA_DBG, ( 2476 "xdf@%s: DMA mem allocation failed\n", 2477 ddi_get_name_addr(vdp->xdf_dip))); 2478 return (DDI_FAILURE); 2479 } 2480 2481 vreq->v_abuf = aba; 2482 vreq->v_align = abh; 2483 vreq->v_status = VREQ_DMAMEM_ALLOCED; 2484 2485 ASSERT(bufsz >= bp->b_bcount); 2486 if (!IS_READ(bp)) 2487 bcopy(bp->b_un.b_addr, vreq->v_abuf, 2488 bp->b_bcount); 2489 } 2490 /*FALLTHRU*/ 2491 2492 case VREQ_DMAMEM_ALLOCED: 2493 /* 2494 * dma bind 2495 */ 2496 if (ALIGNED_XFER(bp)) { 2497 rc = ddi_dma_buf_bind_handle(vreq->v_dmahdl, bp, 2498 dma_flags, xdf_dmacallback, (caddr_t)vdp, 2499 &dc, &ndcs); 2500 } else { 2501 rc = ddi_dma_addr_bind_handle(vreq->v_dmahdl, 2502 NULL, vreq->v_abuf, bp->b_bcount, dma_flags, 2503 xdf_dmacallback, (caddr_t)vdp, &dc, &ndcs); 2504 } 2505 if (rc == DDI_DMA_MAPPED || rc == DDI_DMA_PARTIAL_MAP) { 2506 /* get num of dma windows */ 2507 if (rc == DDI_DMA_PARTIAL_MAP) { 2508 rc = ddi_dma_numwin(vreq->v_dmahdl, &ndws); 2509 ASSERT(rc == DDI_SUCCESS); 2510 } else { 2511 ndws = 1; 2512 } 2513 } else { 2514 SETDMACBON(vdp); 2515 DPRINTF(DMA_DBG, ("xdf@%s: DMA bind failed\n", 2516 ddi_get_name_addr(vdp->xdf_dip))); 2517 return (DDI_FAILURE); 2518 } 2519 2520 vreq->v_dmac = dc; 2521 vreq->v_dmaw = 0; 2522 vreq->v_ndmacs = ndcs; 2523 vreq->v_ndmaws = ndws; 2524 vreq->v_nslots = ndws; 2525 vreq->v_status = VREQ_DMABUF_BOUND; 2526 /*FALLTHRU*/ 2527 2528 case VREQ_DMABUF_BOUND: 2529 /* 2530 * get ge_slot, callback is set upon failure from gs_get(), 2531 * if not set previously 2532 */ 2533 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2534 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2535 ddi_get_name_addr(vdp->xdf_dip))); 2536 return (DDI_FAILURE); 2537 } 2538 2539 vreq->v_gs = gs; 2540 gs->vreq = vreq; 2541 vreq->v_status = VREQ_GS_ALLOCED; 2542 break; 2543 2544 case VREQ_GS_ALLOCED: 2545 /* nothing need to be done */ 2546 break; 2547 2548 case VREQ_DMAWIN_DONE: 2549 /* 2550 * move to the next dma window 2551 */ 2552 ASSERT((vreq->v_dmaw + 1) < vreq->v_ndmaws); 2553 2554 /* get a ge_slot for this DMA window */ 2555 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2556 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2557 ddi_get_name_addr(vdp->xdf_dip))); 2558 return (DDI_FAILURE); 2559 } 2560 2561 vreq->v_gs = gs; 2562 gs->vreq = vreq; 2563 vreq->v_dmaw++; 2564 rc = ddi_dma_getwin(vreq->v_dmahdl, vreq->v_dmaw, &off, &sz, 2565 &vreq->v_dmac, &vreq->v_ndmacs); 2566 ASSERT(rc == DDI_SUCCESS); 2567 vreq->v_status = VREQ_GS_ALLOCED; 2568 break; 2569 2570 default: 2571 return (DDI_FAILURE); 2572 } 2573 2574 return (DDI_SUCCESS); 2575 } 2576 2577 static ge_slot_t * 2578 gs_get(xdf_t *vdp, int isread) 2579 { 2580 grant_ref_t gh; 2581 ge_slot_t *gs; 2582 2583 /* try to alloc GTEs needed in this slot, first */ 2584 if (gnttab_alloc_grant_references( 2585 BLKIF_MAX_SEGMENTS_PER_REQUEST, &gh) == -1) { 2586 if (vdp->xdf_gnt_callback.next == NULL) { 2587 SETDMACBON(vdp); 2588 gnttab_request_free_callback( 2589 &vdp->xdf_gnt_callback, 2590 (void (*)(void *))xdf_dmacallback, 2591 (void *)vdp, 2592 BLKIF_MAX_SEGMENTS_PER_REQUEST); 2593 } 2594 return (NULL); 2595 } 2596 2597 gs = kmem_cache_alloc(xdf_gs_cache, KM_NOSLEEP); 2598 if (gs == NULL) { 2599 gnttab_free_grant_references(gh); 2600 if (vdp->xdf_timeout_id == 0) 2601 /* restart I/O after one second */ 2602 vdp->xdf_timeout_id = 2603 timeout(xdf_timeout_handler, vdp, hz); 2604 return (NULL); 2605 } 2606 2607 /* init gs_slot */ 2608 list_insert_head(&vdp->xdf_gs_act, (void *)gs); 2609 gs->oeid = vdp->xdf_peer; 2610 gs->isread = isread; 2611 gs->ghead = gh; 2612 gs->ngrefs = 0; 2613 2614 return (gs); 2615 } 2616 2617 static void 2618 gs_free(xdf_t *vdp, ge_slot_t *gs) 2619 { 2620 int i; 2621 grant_ref_t *gp = gs->ge; 2622 int ngrefs = gs->ngrefs; 2623 boolean_t isread = gs->isread; 2624 2625 list_remove(&vdp->xdf_gs_act, (void *)gs); 2626 2627 /* release all grant table entry resources used in this slot */ 2628 for (i = 0; i < ngrefs; i++, gp++) 2629 gnttab_end_foreign_access(*gp, !isread, 0); 2630 gnttab_free_grant_references(gs->ghead); 2631 2632 kmem_cache_free(xdf_gs_cache, (void *)gs); 2633 } 2634 2635 static grant_ref_t 2636 gs_grant(ge_slot_t *gs, mfn_t mfn) 2637 { 2638 grant_ref_t gr = gnttab_claim_grant_reference(&gs->ghead); 2639 2640 ASSERT(gr != -1); 2641 ASSERT(gs->ngrefs < BLKIF_MAX_SEGMENTS_PER_REQUEST); 2642 gs->ge[gs->ngrefs++] = gr; 2643 gnttab_grant_foreign_access_ref(gr, gs->oeid, mfn, !gs->isread); 2644 2645 return (gr); 2646 } 2647 2648 static void 2649 unexpectedie(xdf_t *vdp) 2650 { 2651 /* clean up I/Os in ring that have responses */ 2652 if (xvdi_ring_has_unconsumed_responses(vdp->xdf_xb_ring)) { 2653 mutex_exit(&vdp->xdf_dev_lk); 2654 (void) xdf_intr((caddr_t)vdp); 2655 mutex_enter(&vdp->xdf_dev_lk); 2656 } 2657 2658 /* free up all grant table entries */ 2659 while (!list_is_empty(&vdp->xdf_gs_act)) 2660 gs_free(vdp, list_head(&vdp->xdf_gs_act)); 2661 2662 /* 2663 * move bp back to active list orderly 2664 * vreq_busy is updated in vreq_free() 2665 */ 2666 while (!list_is_empty(&vdp->xdf_vreq_act)) { 2667 v_req_t *vreq = list_head(&vdp->xdf_vreq_act); 2668 buf_t *bp = vreq->v_buf; 2669 2670 bp->av_back = NULL; 2671 bp->b_resid = bp->b_bcount; 2672 if (vdp->xdf_f_act == NULL) { 2673 vdp->xdf_f_act = vdp->xdf_l_act = bp; 2674 } else { 2675 /* move to the head of list */ 2676 bp->av_forw = vdp->xdf_f_act; 2677 vdp->xdf_f_act = bp; 2678 } 2679 if (vdp->xdf_xdev_iostat != NULL) 2680 kstat_runq_back_to_waitq( 2681 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 2682 vreq_free(vdp, vreq); 2683 } 2684 } 2685 2686 static void 2687 xdfmin(struct buf *bp) 2688 { 2689 if (bp->b_bcount > xdf_maxphys) 2690 bp->b_bcount = xdf_maxphys; 2691 } 2692 2693 void 2694 xdf_kstat_delete(dev_info_t *dip) 2695 { 2696 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2697 kstat_t *kstat; 2698 2699 /* 2700 * The locking order here is xdf_iostat_lk and then xdf_dev_lk. 2701 * xdf_dev_lk is used to protect the xdf_xdev_iostat pointer 2702 * and the contents of the our kstat. xdf_iostat_lk is used 2703 * to protect the allocation and freeing of the actual kstat. 2704 * xdf_dev_lk can't be used for this purpose because kstat 2705 * readers use it to access the contents of the kstat and 2706 * hence it can't be held when calling kstat_delete(). 2707 */ 2708 mutex_enter(&vdp->xdf_iostat_lk); 2709 mutex_enter(&vdp->xdf_dev_lk); 2710 2711 if (vdp->xdf_xdev_iostat == NULL) { 2712 mutex_exit(&vdp->xdf_dev_lk); 2713 mutex_exit(&vdp->xdf_iostat_lk); 2714 return; 2715 } 2716 2717 kstat = vdp->xdf_xdev_iostat; 2718 vdp->xdf_xdev_iostat = NULL; 2719 mutex_exit(&vdp->xdf_dev_lk); 2720 2721 kstat_delete(kstat); 2722 mutex_exit(&vdp->xdf_iostat_lk); 2723 } 2724 2725 int 2726 xdf_kstat_create(dev_info_t *dip, char *ks_module, int ks_instance) 2727 { 2728 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2729 2730 /* See comment about locking in xdf_kstat_delete(). */ 2731 mutex_enter(&vdp->xdf_iostat_lk); 2732 mutex_enter(&vdp->xdf_dev_lk); 2733 2734 if (vdp->xdf_xdev_iostat != NULL) { 2735 mutex_exit(&vdp->xdf_dev_lk); 2736 mutex_exit(&vdp->xdf_iostat_lk); 2737 return (-1); 2738 } 2739 2740 if ((vdp->xdf_xdev_iostat = kstat_create( 2741 ks_module, ks_instance, NULL, "disk", 2742 KSTAT_TYPE_IO, 1, KSTAT_FLAG_PERSISTENT)) == NULL) { 2743 mutex_exit(&vdp->xdf_dev_lk); 2744 mutex_exit(&vdp->xdf_iostat_lk); 2745 return (-1); 2746 } 2747 2748 vdp->xdf_xdev_iostat->ks_lock = &vdp->xdf_dev_lk; 2749 kstat_install(vdp->xdf_xdev_iostat); 2750 mutex_exit(&vdp->xdf_dev_lk); 2751 mutex_exit(&vdp->xdf_iostat_lk); 2752 2753 return (0); 2754 } 2755 2756 #if defined(XPV_HVM_DRIVER) 2757 2758 typedef struct xdf_hvm_entry { 2759 list_node_t xdf_he_list; 2760 char *xdf_he_path; 2761 dev_info_t *xdf_he_dip; 2762 } xdf_hvm_entry_t; 2763 2764 static list_t xdf_hvm_list; 2765 static kmutex_t xdf_hvm_list_lock; 2766 2767 static xdf_hvm_entry_t * 2768 i_xdf_hvm_find(char *path, dev_info_t *dip) 2769 { 2770 xdf_hvm_entry_t *i; 2771 2772 ASSERT((path != NULL) || (dip != NULL)); 2773 ASSERT(MUTEX_HELD(&xdf_hvm_list_lock)); 2774 2775 i = list_head(&xdf_hvm_list); 2776 while (i != NULL) { 2777 if ((path != NULL) && strcmp(i->xdf_he_path, path) != 0) { 2778 i = list_next(&xdf_hvm_list, i); 2779 continue; 2780 } 2781 if ((dip != NULL) && (i->xdf_he_dip != dip)) { 2782 i = list_next(&xdf_hvm_list, i); 2783 continue; 2784 } 2785 break; 2786 } 2787 return (i); 2788 } 2789 2790 dev_info_t * 2791 xdf_hvm_hold(char *path) 2792 { 2793 xdf_hvm_entry_t *i; 2794 dev_info_t *dip; 2795 2796 mutex_enter(&xdf_hvm_list_lock); 2797 i = i_xdf_hvm_find(path, NULL); 2798 if (i == NULL) { 2799 mutex_exit(&xdf_hvm_list_lock); 2800 return (B_FALSE); 2801 } 2802 ndi_hold_devi(dip = i->xdf_he_dip); 2803 mutex_exit(&xdf_hvm_list_lock); 2804 return (dip); 2805 } 2806 2807 static void 2808 xdf_hvm_add(dev_info_t *dip) 2809 { 2810 xdf_hvm_entry_t *i; 2811 char *path; 2812 2813 /* figure out the path for the dip */ 2814 path = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 2815 (void) ddi_pathname(dip, path); 2816 2817 i = kmem_alloc(sizeof (*i), KM_SLEEP); 2818 i->xdf_he_dip = dip; 2819 i->xdf_he_path = i_ddi_strdup(path, KM_SLEEP); 2820 2821 mutex_enter(&xdf_hvm_list_lock); 2822 ASSERT(i_xdf_hvm_find(path, NULL) == NULL); 2823 ASSERT(i_xdf_hvm_find(NULL, dip) == NULL); 2824 list_insert_head(&xdf_hvm_list, i); 2825 mutex_exit(&xdf_hvm_list_lock); 2826 2827 kmem_free(path, MAXPATHLEN); 2828 } 2829 2830 static void 2831 xdf_hvm_rm(dev_info_t *dip) 2832 { 2833 xdf_hvm_entry_t *i; 2834 2835 mutex_enter(&xdf_hvm_list_lock); 2836 VERIFY((i = i_xdf_hvm_find(NULL, dip)) != NULL); 2837 list_remove(&xdf_hvm_list, i); 2838 mutex_exit(&xdf_hvm_list_lock); 2839 2840 kmem_free(i->xdf_he_path, strlen(i->xdf_he_path) + 1); 2841 kmem_free(i, sizeof (*i)); 2842 } 2843 2844 static void 2845 xdf_hvm_init(void) 2846 { 2847 list_create(&xdf_hvm_list, sizeof (xdf_hvm_entry_t), 2848 offsetof(xdf_hvm_entry_t, xdf_he_list)); 2849 mutex_init(&xdf_hvm_list_lock, NULL, MUTEX_DEFAULT, NULL); 2850 } 2851 2852 static void 2853 xdf_hvm_fini(void) 2854 { 2855 ASSERT(list_head(&xdf_hvm_list) == NULL); 2856 list_destroy(&xdf_hvm_list); 2857 mutex_destroy(&xdf_hvm_list_lock); 2858 } 2859 2860 int 2861 xdf_hvm_connect(dev_info_t *dip) 2862 { 2863 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2864 int rv; 2865 2866 /* do cv_wait until connected or failed */ 2867 mutex_enter(&vdp->xdf_dev_lk); 2868 rv = xdf_connect(vdp, B_TRUE); 2869 mutex_exit(&vdp->xdf_dev_lk); 2870 return ((rv == XD_READY) ? 0 : -1); 2871 } 2872 2873 int 2874 xdf_hvm_setpgeom(dev_info_t *dip, cmlb_geom_t *geomp) 2875 { 2876 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2877 2878 /* sanity check the requested physical geometry */ 2879 mutex_enter(&vdp->xdf_dev_lk); 2880 if ((geomp->g_secsize != XB_BSIZE) || 2881 (geomp->g_capacity == 0)) { 2882 mutex_exit(&vdp->xdf_dev_lk); 2883 return (EINVAL); 2884 } 2885 2886 /* 2887 * If we've already connected to the backend device then make sure 2888 * we're not defining a physical geometry larger than our backend 2889 * device. 2890 */ 2891 if ((vdp->xdf_xdev_nblocks != 0) && 2892 (geomp->g_capacity > vdp->xdf_xdev_nblocks)) { 2893 mutex_exit(&vdp->xdf_dev_lk); 2894 return (EINVAL); 2895 } 2896 2897 vdp->xdf_pgeom = *geomp; 2898 mutex_exit(&vdp->xdf_dev_lk); 2899 2900 /* force a re-validation */ 2901 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 2902 2903 return (0); 2904 } 2905 2906 #endif /* XPV_HVM_DRIVER */ 2907