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