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 2007 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 "xdf.h" 37 38 #define FLUSH_DISKCACHE 0x1 39 #define WRITE_BARRIER 0x2 40 #define DEFAULT_FLUSH_BLOCK 156 /* block to write to cause a cache flush */ 41 #define USE_WRITE_BARRIER(vdp) \ 42 ((vdp)->xdf_feature_barrier && !(vdp)->xdf_flush_supported) 43 #define USE_FLUSH_DISKCACHE(vdp) \ 44 ((vdp)->xdf_feature_barrier && (vdp)->xdf_flush_supported) 45 #define IS_WRITE_BARRIER(vdp, bp) \ 46 (!IS_READ(bp) && USE_WRITE_BARRIER(vdp) && \ 47 ((bp)->b_un.b_addr == (vdp)->xdf_cache_flush_block)) 48 #define IS_FLUSH_DISKCACHE(bp) \ 49 (!IS_READ(bp) && USE_FLUSH_DISKCACHE(vdp) && ((bp)->b_bcount == 0)) 50 51 static void *vbd_ss; 52 static kmem_cache_t *xdf_vreq_cache; 53 static kmem_cache_t *xdf_gs_cache; 54 static int xdf_maxphys = XB_MAXPHYS; 55 int xdfdebug = 0; 56 extern int do_polled_io; 57 diskaddr_t xdf_flush_block = DEFAULT_FLUSH_BLOCK; 58 int xdf_barrier_flush_disable = 0; 59 60 /* 61 * dev_ops and cb_ops entrypoints 62 */ 63 static int xdf_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 64 static int xdf_attach(dev_info_t *, ddi_attach_cmd_t); 65 static int xdf_detach(dev_info_t *, ddi_detach_cmd_t); 66 static int xdf_reset(dev_info_t *, ddi_reset_cmd_t); 67 static int xdf_open(dev_t *, int, int, cred_t *); 68 static int xdf_close(dev_t, int, int, struct cred *); 69 static int xdf_strategy(struct buf *); 70 static int xdf_read(dev_t, struct uio *, cred_t *); 71 static int xdf_aread(dev_t, struct aio_req *, cred_t *); 72 static int xdf_write(dev_t, struct uio *, cred_t *); 73 static int xdf_awrite(dev_t, struct aio_req *, cred_t *); 74 static int xdf_dump(dev_t, caddr_t, daddr_t, int); 75 static int xdf_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 76 static uint_t xdf_intr(caddr_t); 77 static int xdf_prop_op(dev_t, dev_info_t *, ddi_prop_op_t, int, char *, 78 caddr_t, int *); 79 80 /* 81 * misc private functions 82 */ 83 static int xdf_suspend(dev_info_t *); 84 static int xdf_resume(dev_info_t *); 85 static int xdf_start_connect(xdf_t *); 86 static int xdf_start_disconnect(xdf_t *); 87 static int xdf_post_connect(xdf_t *); 88 static void xdf_post_disconnect(xdf_t *); 89 static void xdf_oe_change(dev_info_t *, ddi_eventcookie_t, void *, void *); 90 static void xdf_iostart(xdf_t *); 91 static void xdf_iofini(xdf_t *, uint64_t, int); 92 static int xdf_prepare_rreq(xdf_t *, struct buf *, blkif_request_t *); 93 static int xdf_drain_io(xdf_t *); 94 static boolean_t xdf_isopen(xdf_t *, int); 95 static int xdf_check_state_transition(xdf_t *, XenbusState); 96 static int xdf_connect(xdf_t *, boolean_t); 97 static int xdf_dmacallback(caddr_t); 98 static void xdf_timeout_handler(void *); 99 static uint_t xdf_iorestart(caddr_t); 100 static v_req_t *vreq_get(xdf_t *, buf_t *); 101 static void vreq_free(xdf_t *, v_req_t *); 102 static int vreq_setup(xdf_t *, v_req_t *); 103 static ge_slot_t *gs_get(xdf_t *, int); 104 static void gs_free(xdf_t *, ge_slot_t *); 105 static grant_ref_t gs_grant(ge_slot_t *, mfn_t); 106 static void unexpectedie(xdf_t *); 107 static void xdfmin(struct buf *); 108 109 static struct cb_ops xdf_cbops = { 110 xdf_open, 111 xdf_close, 112 xdf_strategy, 113 nodev, 114 xdf_dump, 115 xdf_read, 116 xdf_write, 117 xdf_ioctl, 118 nodev, 119 nodev, 120 nodev, 121 nochpoll, 122 xdf_prop_op, 123 NULL, 124 D_MP | D_NEW | D_64BIT, 125 CB_REV, 126 xdf_aread, 127 xdf_awrite 128 }; 129 130 struct dev_ops xdf_devops = { 131 DEVO_REV, /* devo_rev */ 132 0, /* devo_refcnt */ 133 xdf_getinfo, /* devo_getinfo */ 134 nulldev, /* devo_identify */ 135 nulldev, /* devo_probe */ 136 xdf_attach, /* devo_attach */ 137 xdf_detach, /* devo_detach */ 138 xdf_reset, /* devo_reset */ 139 &xdf_cbops, /* devo_cb_ops */ 140 (struct bus_ops *)NULL /* devo_bus_ops */ 141 }; 142 143 static struct modldrv modldrv = { 144 &mod_driverops, /* Type of module. This one is a driver */ 145 "virtual block driver %I%", /* short description */ 146 &xdf_devops /* driver specific ops */ 147 }; 148 149 static struct modlinkage xdf_modlinkage = { 150 MODREV_1, (void *)&modldrv, NULL 151 }; 152 153 /* 154 * I/O buffer DMA attributes 155 * Make sure: one DMA window contains BLKIF_MAX_SEGMENTS_PER_REQUEST at most 156 */ 157 static ddi_dma_attr_t xb_dma_attr = { 158 DMA_ATTR_V0, 159 (uint64_t)0, /* lowest address */ 160 (uint64_t)0xffffffffffffffff, /* highest usable address */ 161 (uint64_t)0xffffff, /* DMA counter limit max */ 162 (uint64_t)XB_BSIZE, /* alignment in bytes */ 163 XB_BSIZE - 1, /* bitmap of burst sizes */ 164 XB_BSIZE, /* min transfer */ 165 (uint64_t)XB_MAX_XFER, /* maximum transfer */ 166 (uint64_t)PAGEOFFSET, /* 1 page segment length */ 167 BLKIF_MAX_SEGMENTS_PER_REQUEST, /* maximum number of segments */ 168 XB_BSIZE, /* granularity */ 169 0, /* flags (reserved) */ 170 }; 171 172 static ddi_device_acc_attr_t xc_acc_attr = { 173 DDI_DEVICE_ATTR_V0, 174 DDI_NEVERSWAP_ACC, 175 DDI_STRICTORDER_ACC 176 }; 177 178 /* callbacks from commmon label */ 179 180 static int xdf_lb_rdwr(dev_info_t *, uchar_t, void *, diskaddr_t, size_t, 181 void *); 182 static int xdf_lb_getinfo(dev_info_t *, int, void *, void *); 183 184 static cmlb_tg_ops_t xdf_lb_ops = { 185 TG_DK_OPS_VERSION_1, 186 xdf_lb_rdwr, 187 xdf_lb_getinfo 188 }; 189 190 int 191 _init(void) 192 { 193 int rc; 194 195 if ((rc = ddi_soft_state_init(&vbd_ss, sizeof (xdf_t), 0)) == 0) { 196 xdf_vreq_cache = kmem_cache_create("xdf_vreq_cache", 197 sizeof (v_req_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 198 ASSERT(xdf_vreq_cache != NULL); 199 xdf_gs_cache = kmem_cache_create("xdf_gs_cache", 200 sizeof (ge_slot_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 201 ASSERT(xdf_gs_cache != NULL); 202 if ((rc = mod_install(&xdf_modlinkage)) != 0) { 203 kmem_cache_destroy(xdf_vreq_cache); 204 kmem_cache_destroy(xdf_gs_cache); 205 ddi_soft_state_fini(&vbd_ss); 206 } 207 } 208 209 return (rc); 210 } 211 212 int 213 _fini(void) 214 { 215 int err; 216 217 if ((err = mod_remove(&xdf_modlinkage)) != 0) 218 return (err); 219 220 kmem_cache_destroy(xdf_vreq_cache); 221 kmem_cache_destroy(xdf_gs_cache); 222 ddi_soft_state_fini(&vbd_ss); 223 224 return (0); 225 } 226 227 int 228 _info(struct modinfo *modinfop) 229 { 230 return (mod_info(&xdf_modlinkage, modinfop)); 231 } 232 233 /*ARGSUSED*/ 234 static int 235 xdf_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **rp) 236 { 237 int instance; 238 xdf_t *vbdp; 239 240 instance = XDF_INST(getminor((dev_t)arg)); 241 242 switch (cmd) { 243 case DDI_INFO_DEVT2DEVINFO: 244 if ((vbdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) { 245 *rp = NULL; 246 return (DDI_FAILURE); 247 } 248 *rp = vbdp->xdf_dip; 249 return (DDI_SUCCESS); 250 251 case DDI_INFO_DEVT2INSTANCE: 252 *rp = (void *)(uintptr_t)instance; 253 return (DDI_SUCCESS); 254 255 default: 256 return (DDI_FAILURE); 257 } 258 } 259 260 static int 261 xdf_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags, 262 char *name, caddr_t valuep, int *lengthp) 263 { 264 int instance = ddi_get_instance(dip); 265 xdf_t *vdp; 266 diskaddr_t p_blkcnt; 267 268 /* 269 * xdf dynamic properties are device specific and size oriented. 270 * Requests issued under conditions where size is valid are passed 271 * to ddi_prop_op_nblocks with the size information, otherwise the 272 * request is passed to ddi_prop_op. 273 */ 274 vdp = ddi_get_soft_state(vbd_ss, instance); 275 276 if ((dev == DDI_DEV_T_ANY) || (vdp == NULL)) 277 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 278 name, valuep, lengthp)); 279 280 /* do cv_wait until connected or failed */ 281 mutex_enter(&vdp->xdf_dev_lk); 282 if (xdf_connect(vdp, B_TRUE) != XD_READY) { 283 mutex_exit(&vdp->xdf_dev_lk); 284 goto out; 285 } 286 mutex_exit(&vdp->xdf_dev_lk); 287 288 if (cmlb_partinfo(vdp->xdf_vd_lbl, XDF_PART(getminor(dev)), &p_blkcnt, 289 NULL, NULL, NULL, NULL) == 0) 290 return (ddi_prop_op_nblocks(dev, dip, prop_op, mod_flags, 291 name, valuep, lengthp, (uint64_t)p_blkcnt)); 292 293 out: 294 return (ddi_prop_op(dev, dip, prop_op, mod_flags, name, valuep, 295 lengthp)); 296 } 297 298 static int 299 xdf_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 300 { 301 xdf_t *vdp; 302 ddi_iblock_cookie_t ibc; 303 ddi_iblock_cookie_t softibc; 304 int instance; 305 306 xdfdebug = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_NOTPROM, 307 "xdfdebug", 0); 308 309 switch (cmd) { 310 case DDI_ATTACH: 311 break; 312 313 case DDI_RESUME: 314 return (xdf_resume(devi)); 315 316 default: 317 return (DDI_FAILURE); 318 } 319 320 instance = ddi_get_instance(devi); 321 if (ddi_soft_state_zalloc(vbd_ss, instance) != DDI_SUCCESS) 322 return (DDI_FAILURE); 323 324 DPRINTF(DDI_DBG, ("xdf%d: attaching\n", instance)); 325 vdp = ddi_get_soft_state(vbd_ss, instance); 326 vdp->xdf_dip = devi; 327 if (ddi_get_iblock_cookie(devi, 0, &ibc) != DDI_SUCCESS) { 328 cmn_err(CE_WARN, "xdf@%s: failed to get iblock cookie", 329 ddi_get_name_addr(devi)); 330 goto errout1; 331 } 332 333 mutex_init(&vdp->xdf_dev_lk, NULL, MUTEX_DRIVER, (void *)ibc); 334 mutex_init(&vdp->xdf_cb_lk, NULL, MUTEX_DRIVER, (void *)ibc); 335 cv_init(&vdp->xdf_dev_cv, NULL, CV_DEFAULT, NULL); 336 ddi_set_driver_private(devi, vdp); 337 338 if (ddi_get_soft_iblock_cookie(devi, DDI_SOFTINT_LOW, &softibc) 339 != DDI_SUCCESS) { 340 cmn_err(CE_WARN, "xdf@%s: failed to get softintr iblock cookie", 341 ddi_get_name_addr(devi)); 342 goto errout2; 343 } 344 if (ddi_add_softintr(devi, DDI_SOFTINT_LOW, &vdp->xdf_softintr_id, 345 &softibc, NULL, xdf_iorestart, (caddr_t)vdp) != DDI_SUCCESS) { 346 cmn_err(CE_WARN, "xdf@%s: failed to add softintr", 347 ddi_get_name_addr(devi)); 348 goto errout2; 349 } 350 351 /* 352 * create kstat for iostat(1M) 353 */ 354 if ((vdp->xdf_xdev_iostat = kstat_create("xdf", instance, NULL, "disk", 355 KSTAT_TYPE_IO, 1, KSTAT_FLAG_PERSISTENT)) != NULL) { 356 vdp->xdf_xdev_iostat->ks_lock = &vdp->xdf_dev_lk; 357 kstat_install(vdp->xdf_xdev_iostat); 358 } else { 359 cmn_err(CE_WARN, "xdf@%s: failed to create kstat", 360 ddi_get_name_addr(devi)); 361 goto errout3; 362 } 363 364 /* 365 * driver handles kernel-issued IOCTLs 366 */ 367 if (ddi_prop_create(DDI_DEV_T_NONE, devi, DDI_PROP_CANSLEEP, 368 DDI_KERNEL_IOCTL, NULL, 0) != DDI_PROP_SUCCESS) { 369 cmn_err(CE_WARN, "xdf@%s: cannot create DDI_KERNEL_IOCTL prop", 370 ddi_get_name_addr(devi)); 371 goto errout4; 372 } 373 374 /* 375 * create default device minor nodes: non-removable disk 376 * we will adjust minor nodes after we are connected w/ backend 377 */ 378 cmlb_alloc_handle(&vdp->xdf_vd_lbl); 379 if (cmlb_attach(devi, &xdf_lb_ops, DTYPE_DIRECT, 0, 1, DDI_NT_BLOCK, 380 CMLB_FAKE_LABEL_ONE_PARTITION, vdp->xdf_vd_lbl, NULL) != 0) { 381 cmn_err(CE_WARN, "xdf@%s: default cmlb attach failed", 382 ddi_get_name_addr(devi)); 383 goto errout5; 384 } 385 386 /* 387 * We ship with cache-enabled disks 388 */ 389 vdp->xdf_wce = 1; 390 391 mutex_enter(&vdp->xdf_cb_lk); 392 393 /* Watch backend XenbusState change */ 394 if (xvdi_add_event_handler(devi, XS_OE_STATE, 395 xdf_oe_change) != DDI_SUCCESS) { 396 mutex_exit(&vdp->xdf_cb_lk); 397 goto errout6; 398 } 399 400 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 401 cmn_err(CE_WARN, "xdf@%s: start connection failed", 402 ddi_get_name_addr(devi)); 403 (void) xdf_start_disconnect(vdp); 404 mutex_exit(&vdp->xdf_cb_lk); 405 goto errout7; 406 } 407 408 mutex_exit(&vdp->xdf_cb_lk); 409 410 list_create(&vdp->xdf_vreq_act, sizeof (v_req_t), 411 offsetof(v_req_t, v_link)); 412 list_create(&vdp->xdf_gs_act, sizeof (ge_slot_t), 413 offsetof(ge_slot_t, link)); 414 415 ddi_report_dev(devi); 416 DPRINTF(DDI_DBG, ("xdf%d: attached\n", instance)); 417 418 return (DDI_SUCCESS); 419 420 errout7: 421 xvdi_remove_event_handler(devi, XS_OE_STATE); 422 errout6: 423 cmlb_detach(vdp->xdf_vd_lbl, NULL); 424 errout5: 425 cmlb_free_handle(&vdp->xdf_vd_lbl); 426 ddi_prop_remove_all(devi); 427 errout4: 428 kstat_delete(vdp->xdf_xdev_iostat); 429 errout3: 430 ddi_remove_softintr(vdp->xdf_softintr_id); 431 errout2: 432 ddi_set_driver_private(devi, NULL); 433 cv_destroy(&vdp->xdf_dev_cv); 434 mutex_destroy(&vdp->xdf_cb_lk); 435 mutex_destroy(&vdp->xdf_dev_lk); 436 errout1: 437 cmn_err(CE_WARN, "xdf@%s: attach failed", ddi_get_name_addr(devi)); 438 ddi_soft_state_free(vbd_ss, instance); 439 return (DDI_FAILURE); 440 } 441 442 static int 443 xdf_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 444 { 445 xdf_t *vdp; 446 int instance; 447 448 switch (cmd) { 449 450 case DDI_PM_SUSPEND: 451 break; 452 453 case DDI_SUSPEND: 454 return (xdf_suspend(devi)); 455 456 case DDI_DETACH: 457 break; 458 459 default: 460 return (DDI_FAILURE); 461 } 462 463 instance = ddi_get_instance(devi); 464 DPRINTF(DDI_DBG, ("xdf%d: detaching\n", instance)); 465 vdp = ddi_get_soft_state(vbd_ss, instance); 466 467 if (vdp == NULL) 468 return (DDI_FAILURE); 469 470 mutex_enter(&vdp->xdf_dev_lk); 471 if (xdf_isopen(vdp, -1)) { 472 mutex_exit(&vdp->xdf_dev_lk); 473 return (DDI_FAILURE); 474 } 475 476 if (vdp->xdf_status != XD_CLOSED) { 477 mutex_exit(&vdp->xdf_dev_lk); 478 return (DDI_FAILURE); 479 } 480 481 ASSERT(!ISDMACBON(vdp)); 482 mutex_exit(&vdp->xdf_dev_lk); 483 484 if (vdp->xdf_timeout_id != 0) 485 (void) untimeout(vdp->xdf_timeout_id); 486 487 xvdi_remove_event_handler(devi, XS_OE_STATE); 488 489 /* we'll support backend running in domU later */ 490 #ifdef DOMU_BACKEND 491 (void) xvdi_post_event(devi, XEN_HP_REMOVE); 492 #endif 493 494 list_destroy(&vdp->xdf_vreq_act); 495 list_destroy(&vdp->xdf_gs_act); 496 ddi_prop_remove_all(devi); 497 kstat_delete(vdp->xdf_xdev_iostat); 498 ddi_remove_softintr(vdp->xdf_softintr_id); 499 ddi_set_driver_private(devi, NULL); 500 cv_destroy(&vdp->xdf_dev_cv); 501 mutex_destroy(&vdp->xdf_cb_lk); 502 mutex_destroy(&vdp->xdf_dev_lk); 503 if (vdp->xdf_cache_flush_block != NULL) 504 kmem_free(vdp->xdf_flush_mem, 2 * DEV_BSIZE); 505 ddi_soft_state_free(vbd_ss, instance); 506 return (DDI_SUCCESS); 507 } 508 509 static int 510 xdf_suspend(dev_info_t *devi) 511 { 512 xdf_t *vdp; 513 int instance; 514 enum xdf_state st; 515 516 instance = ddi_get_instance(devi); 517 518 if (xdfdebug & SUSRES_DBG) 519 xen_printf("xdf_suspend: xdf#%d\n", instance); 520 521 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 522 return (DDI_FAILURE); 523 524 xvdi_suspend(devi); 525 526 mutex_enter(&vdp->xdf_cb_lk); 527 mutex_enter(&vdp->xdf_dev_lk); 528 st = vdp->xdf_status; 529 /* change status to stop further I/O requests */ 530 if (st == XD_READY) 531 vdp->xdf_status = XD_SUSPEND; 532 mutex_exit(&vdp->xdf_dev_lk); 533 mutex_exit(&vdp->xdf_cb_lk); 534 535 /* make sure no more I/O responses left in the ring buffer */ 536 if ((st == XD_INIT) || (st == XD_READY)) { 537 (void) ddi_remove_intr(devi, 0, NULL); 538 (void) xdf_drain_io(vdp); 539 /* 540 * no need to teardown the ring buffer here 541 * it will be simply re-init'ed during resume when 542 * we call xvdi_alloc_ring 543 */ 544 } 545 546 if (xdfdebug & SUSRES_DBG) 547 xen_printf("xdf_suspend: SUCCESS\n"); 548 549 return (DDI_SUCCESS); 550 } 551 552 /*ARGSUSED*/ 553 static int 554 xdf_resume(dev_info_t *devi) 555 { 556 xdf_t *vdp; 557 int instance; 558 559 instance = ddi_get_instance(devi); 560 if (xdfdebug & SUSRES_DBG) 561 xen_printf("xdf_resume: xdf%d\n", instance); 562 563 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 564 return (DDI_FAILURE); 565 566 mutex_enter(&vdp->xdf_cb_lk); 567 568 if (xvdi_resume(devi) != DDI_SUCCESS) { 569 mutex_exit(&vdp->xdf_cb_lk); 570 return (DDI_FAILURE); 571 } 572 573 mutex_enter(&vdp->xdf_dev_lk); 574 ASSERT(vdp->xdf_status != XD_READY); 575 vdp->xdf_status = XD_UNKNOWN; 576 mutex_exit(&vdp->xdf_dev_lk); 577 578 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 579 mutex_exit(&vdp->xdf_cb_lk); 580 return (DDI_FAILURE); 581 } 582 583 mutex_exit(&vdp->xdf_cb_lk); 584 585 if (xdfdebug & SUSRES_DBG) 586 xen_printf("xdf_resume: done\n"); 587 return (DDI_SUCCESS); 588 } 589 590 /*ARGSUSED*/ 591 static int 592 xdf_reset(dev_info_t *devi, ddi_reset_cmd_t cmd) 593 { 594 xdf_t *vdp; 595 int instance; 596 597 instance = ddi_get_instance(devi); 598 DPRINTF(DDI_DBG, ("xdf%d: resetting\n", instance)); 599 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 600 return (DDI_FAILURE); 601 602 /* 603 * wait for any outstanding I/O to complete 604 */ 605 (void) xdf_drain_io(vdp); 606 607 DPRINTF(DDI_DBG, ("xdf%d: reset complete\n", instance)); 608 return (DDI_SUCCESS); 609 } 610 611 static int 612 xdf_open(dev_t *devp, int flag, int otyp, cred_t *credp) 613 { 614 minor_t minor; 615 xdf_t *vdp; 616 int part; 617 ulong_t parbit; 618 diskaddr_t p_blkct = 0; 619 boolean_t firstopen; 620 boolean_t nodelay; 621 622 nodelay = (flag & (FNDELAY | FNONBLOCK)); 623 minor = getminor(*devp); 624 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 625 return (ENXIO); 626 627 DPRINTF(DDI_DBG, ("xdf%d: opening\n", XDF_INST(minor))); 628 629 /* do cv_wait until connected or failed */ 630 mutex_enter(&vdp->xdf_dev_lk); 631 if (!nodelay && (xdf_connect(vdp, B_TRUE) != XD_READY)) { 632 mutex_exit(&vdp->xdf_dev_lk); 633 return (ENXIO); 634 } 635 636 if ((flag & FWRITE) && XD_IS_RO(vdp)) { 637 mutex_exit(&vdp->xdf_dev_lk); 638 return (EROFS); 639 } 640 641 part = XDF_PART(minor); 642 parbit = 1 << part; 643 if (vdp->xdf_vd_exclopen & parbit) { 644 mutex_exit(&vdp->xdf_dev_lk); 645 return (EBUSY); 646 } 647 648 /* are we the first one to open this node? */ 649 firstopen = !xdf_isopen(vdp, -1); 650 651 if ((flag & FEXCL) && !firstopen) { 652 mutex_exit(&vdp->xdf_dev_lk); 653 return (EBUSY); 654 } 655 656 if (otyp == OTYP_LYR) 657 vdp->xdf_vd_lyropen[part]++; 658 659 vdp->xdf_vd_open[otyp] |= parbit; 660 661 if (flag & FEXCL) 662 vdp->xdf_vd_exclopen |= parbit; 663 664 mutex_exit(&vdp->xdf_dev_lk); 665 666 /* force a re-validation */ 667 if (firstopen) 668 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 669 670 /* 671 * check size 672 * ignore CD/DVD which contains a zero-sized s0 673 */ 674 if (!nodelay && !XD_IS_CD(vdp) && 675 ((cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 676 NULL, NULL, NULL, NULL) != 0) || (p_blkct == 0))) { 677 (void) xdf_close(*devp, flag, otyp, credp); 678 return (ENXIO); 679 } 680 681 return (0); 682 } 683 684 /*ARGSUSED*/ 685 static int 686 xdf_close(dev_t dev, int flag, int otyp, struct cred *credp) 687 { 688 minor_t minor; 689 xdf_t *vdp; 690 int part; 691 ulong_t parbit; 692 693 minor = getminor(dev); 694 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 695 return (ENXIO); 696 697 mutex_enter(&vdp->xdf_dev_lk); 698 part = XDF_PART(minor); 699 if (!xdf_isopen(vdp, part)) { 700 mutex_exit(&vdp->xdf_dev_lk); 701 return (ENXIO); 702 } 703 parbit = 1 << part; 704 705 if (otyp == OTYP_LYR) { 706 if (vdp->xdf_vd_lyropen[part] != 0) 707 vdp->xdf_vd_lyropen[part]--; 708 if (vdp->xdf_vd_lyropen[part] == 0) 709 vdp->xdf_vd_open[OTYP_LYR] &= ~parbit; 710 } else { 711 vdp->xdf_vd_open[otyp] &= ~parbit; 712 } 713 vdp->xdf_vd_exclopen &= ~parbit; 714 715 mutex_exit(&vdp->xdf_dev_lk); 716 return (0); 717 } 718 719 static int 720 xdf_strategy(struct buf *bp) 721 { 722 xdf_t *vdp; 723 minor_t minor; 724 diskaddr_t p_blkct, p_blkst; 725 ulong_t nblks; 726 int part; 727 728 minor = getminor(bp->b_edev); 729 part = XDF_PART(minor); 730 if (!(vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) || 731 !xdf_isopen(vdp, part) || 732 cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 733 &p_blkst, NULL, NULL, NULL)) { 734 bioerror(bp, ENXIO); 735 bp->b_resid = bp->b_bcount; 736 biodone(bp); 737 return (0); 738 } 739 740 if (!IS_READ(bp) && XD_IS_RO(vdp)) { 741 bioerror(bp, EROFS); 742 bp->b_resid = bp->b_bcount; 743 biodone(bp); 744 return (0); 745 } 746 747 /* 748 * starting beyond partition 749 */ 750 if (bp->b_blkno > p_blkct) { 751 DPRINTF(IO_DBG, ("xdf: block %lld exceeds VBD size %"PRIu64, 752 (longlong_t)bp->b_blkno, (uint64_t)p_blkct)); 753 bioerror(bp, EINVAL); 754 bp->b_resid = bp->b_bcount; 755 biodone(bp); 756 return (0); 757 } 758 759 /* Legacy: don't set error flag at this case */ 760 if (bp->b_blkno == p_blkct) { 761 bp->b_resid = bp->b_bcount; 762 biodone(bp); 763 return (0); 764 } 765 766 /* 767 * adjust for partial transfer 768 */ 769 nblks = bp->b_bcount >> XB_BSHIFT; 770 if ((bp->b_blkno + nblks) > p_blkct) { 771 bp->b_resid = ((bp->b_blkno + nblks) - p_blkct) << XB_BSHIFT; 772 bp->b_bcount -= bp->b_resid; 773 } 774 775 776 DPRINTF(IO_DBG, ("xdf: strategy blk %lld len %lu\n", 777 (longlong_t)bp->b_blkno, (ulong_t)bp->b_bcount)); 778 779 mutex_enter(&vdp->xdf_dev_lk); 780 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 781 if (vdp->xdf_f_act == NULL) { 782 vdp->xdf_f_act = vdp->xdf_l_act = bp; 783 } else { 784 vdp->xdf_l_act->av_forw = bp; 785 vdp->xdf_l_act = bp; 786 } 787 bp->av_forw = NULL; 788 bp->av_back = NULL; /* not tagged with a v_req */ 789 bp->b_private = (void *)(uintptr_t)p_blkst; 790 mutex_exit(&vdp->xdf_dev_lk); 791 xdf_iostart(vdp); 792 if (do_polled_io) 793 (void) xdf_drain_io(vdp); 794 return (0); 795 } 796 797 /*ARGSUSED*/ 798 static int 799 xdf_read(dev_t dev, struct uio *uiop, cred_t *credp) 800 { 801 802 xdf_t *vdp; 803 minor_t minor; 804 diskaddr_t p_blkcnt; 805 int part; 806 807 minor = getminor(dev); 808 if (!(vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)))) 809 return (ENXIO); 810 811 DPRINTF(IO_DBG, ("xdf: read offset 0x%"PRIx64"\n", 812 (int64_t)uiop->uio_offset)); 813 814 part = XDF_PART(minor); 815 if (!xdf_isopen(vdp, part)) 816 return (ENXIO); 817 818 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 819 NULL, NULL, NULL, NULL)) 820 return (ENXIO); 821 822 if (U_INVAL(uiop)) 823 return (EINVAL); 824 825 return (physio(xdf_strategy, NULL, dev, B_READ, xdfmin, uiop)); 826 } 827 828 /*ARGSUSED*/ 829 static int 830 xdf_write(dev_t dev, struct uio *uiop, cred_t *credp) 831 { 832 xdf_t *vdp; 833 minor_t minor; 834 diskaddr_t p_blkcnt; 835 int part; 836 837 minor = getminor(dev); 838 if (!(vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)))) 839 return (ENXIO); 840 841 DPRINTF(IO_DBG, ("xdf: write offset 0x%"PRIx64"\n", 842 (int64_t)uiop->uio_offset)); 843 844 part = XDF_PART(minor); 845 if (!xdf_isopen(vdp, part)) 846 return (ENXIO); 847 848 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 849 NULL, NULL, NULL, NULL)) 850 return (ENXIO); 851 852 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 853 return (ENOSPC); 854 855 if (U_INVAL(uiop)) 856 return (EINVAL); 857 858 return (physio(xdf_strategy, NULL, dev, B_WRITE, minphys, uiop)); 859 } 860 861 /*ARGSUSED*/ 862 static int 863 xdf_aread(dev_t dev, struct aio_req *aiop, cred_t *credp) 864 { 865 xdf_t *vdp; 866 minor_t minor; 867 struct uio *uiop = aiop->aio_uio; 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)))) 873 return (ENXIO); 874 875 part = XDF_PART(minor); 876 if (!xdf_isopen(vdp, part)) 877 return (ENXIO); 878 879 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 880 NULL, NULL, NULL, NULL)) 881 return (ENXIO); 882 883 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 884 return (ENOSPC); 885 886 if (U_INVAL(uiop)) 887 return (EINVAL); 888 889 return (aphysio(xdf_strategy, anocancel, dev, B_READ, minphys, aiop)); 890 } 891 892 /*ARGSUSED*/ 893 static int 894 xdf_awrite(dev_t dev, struct aio_req *aiop, cred_t *credp) 895 { 896 xdf_t *vdp; 897 minor_t minor; 898 struct uio *uiop = aiop->aio_uio; 899 diskaddr_t p_blkcnt; 900 int part; 901 902 minor = getminor(dev); 903 if (!(vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)))) 904 return (ENXIO); 905 906 part = XDF_PART(minor); 907 if (!xdf_isopen(vdp, part)) 908 return (ENXIO); 909 910 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 911 NULL, NULL, NULL, NULL)) 912 return (ENXIO); 913 914 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 915 return (ENOSPC); 916 917 if (U_INVAL(uiop)) 918 return (EINVAL); 919 920 return (aphysio(xdf_strategy, anocancel, dev, B_WRITE, minphys, aiop)); 921 } 922 923 static int 924 xdf_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) 925 { 926 struct buf dumpbuf, *dbp; 927 xdf_t *vdp; 928 minor_t minor; 929 int err = 0; 930 int part; 931 diskaddr_t p_blkcnt, p_blkst; 932 933 minor = getminor(dev); 934 if (!(vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)))) 935 return (ENXIO); 936 937 DPRINTF(IO_DBG, ("xdf: dump addr (0x%p) blk (%ld) nblks (%d)\n", 938 addr, blkno, nblk)); 939 940 part = XDF_PART(minor); 941 if (!xdf_isopen(vdp, part)) 942 return (ENXIO); 943 944 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, &p_blkst, 945 NULL, NULL, NULL)) 946 return (ENXIO); 947 948 if ((blkno + nblk) > p_blkcnt) { 949 cmn_err(CE_WARN, "xdf: block %ld exceeds VBD size %"PRIu64, 950 blkno + nblk, (uint64_t)vdp->xdf_xdev_nblocks); 951 return (EINVAL); 952 } 953 954 dbp = &dumpbuf; 955 bioinit(dbp); 956 dbp->b_flags = B_BUSY; 957 dbp->b_un.b_addr = addr; 958 dbp->b_bcount = nblk << DEV_BSHIFT; 959 dbp->b_resid = 0; 960 dbp->b_blkno = blkno; 961 dbp->b_edev = dev; 962 dbp->b_private = (void *)(uintptr_t)p_blkst; 963 964 mutex_enter(&vdp->xdf_dev_lk); 965 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 966 if (vdp->xdf_f_act == NULL) { 967 vdp->xdf_f_act = vdp->xdf_l_act = dbp; 968 } else { 969 vdp->xdf_l_act->av_forw = dbp; 970 vdp->xdf_l_act = dbp; 971 } 972 dbp->av_forw = NULL; 973 dbp->av_back = NULL; 974 mutex_exit(&vdp->xdf_dev_lk); 975 xdf_iostart(vdp); 976 err = xdf_drain_io(vdp); 977 biofini(dbp); 978 return (err); 979 } 980 981 /*ARGSUSED*/ 982 static int 983 xdf_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 984 int *rvalp) 985 { 986 int instance; 987 xdf_t *vdp; 988 minor_t minor; 989 int part; 990 991 minor = getminor(dev); 992 instance = XDF_INST(minor); 993 994 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 995 return (ENXIO); 996 997 DPRINTF(IOCTL_DBG, ("xdf%d:ioctl: cmd %d (0x%x)\n", 998 instance, cmd, cmd)); 999 1000 part = XDF_PART(minor); 1001 if (!xdf_isopen(vdp, part)) 1002 return (ENXIO); 1003 1004 switch (cmd) { 1005 case DKIOCGMEDIAINFO: { 1006 struct dk_minfo media_info; 1007 1008 media_info.dki_lbsize = DEV_BSIZE; 1009 media_info.dki_capacity = vdp->xdf_xdev_nblocks; 1010 media_info.dki_media_type = DK_FIXED_DISK; 1011 1012 if (ddi_copyout(&media_info, (void *)arg, 1013 sizeof (struct dk_minfo), mode)) { 1014 return (EFAULT); 1015 } else { 1016 return (0); 1017 } 1018 } 1019 1020 case DKIOCINFO: { 1021 struct dk_cinfo info; 1022 1023 /* controller information */ 1024 if (XD_IS_CD(vdp)) 1025 info.dki_ctype = DKC_CDROM; 1026 else 1027 info.dki_ctype = DKC_VBD; 1028 1029 info.dki_cnum = 0; 1030 (void) strncpy((char *)(&info.dki_cname), "xdf", 8); 1031 1032 /* unit information */ 1033 info.dki_unit = ddi_get_instance(vdp->xdf_dip); 1034 (void) strncpy((char *)(&info.dki_dname), "xdf", 8); 1035 info.dki_flags = DKI_FMTVOL; 1036 info.dki_partition = part; 1037 info.dki_maxtransfer = maxphys / DEV_BSIZE; 1038 info.dki_addr = 0; 1039 info.dki_space = 0; 1040 info.dki_prio = 0; 1041 info.dki_vec = 0; 1042 1043 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode)) 1044 return (EFAULT); 1045 else 1046 return (0); 1047 } 1048 1049 case DKIOCSTATE: { 1050 enum dkio_state dkstate = DKIO_INSERTED; 1051 if (ddi_copyout(&dkstate, (void *)arg, sizeof (dkstate), 1052 mode) != 0) 1053 return (EFAULT); 1054 return (0); 1055 } 1056 1057 /* 1058 * is media removable? 1059 */ 1060 case DKIOCREMOVABLE: { 1061 int i = XD_IS_RM(vdp) ? 1 : 0; 1062 if (ddi_copyout(&i, (caddr_t)arg, sizeof (int), mode)) 1063 return (EFAULT); 1064 return (0); 1065 } 1066 1067 case DKIOCG_PHYGEOM: 1068 case DKIOCG_VIRTGEOM: 1069 case DKIOCGGEOM: 1070 case DKIOCSGEOM: 1071 case DKIOCGAPART: 1072 case DKIOCGVTOC: 1073 case DKIOCSVTOC: 1074 case DKIOCPARTINFO: 1075 case DKIOCGETEFI: 1076 case DKIOCSETEFI: 1077 case DKIOCPARTITION: { 1078 int rc; 1079 1080 rc = cmlb_ioctl(vdp->xdf_vd_lbl, dev, cmd, arg, mode, credp, 1081 rvalp, NULL); 1082 return (rc); 1083 } 1084 1085 case DKIOCGETWCE: 1086 if (ddi_copyout(&vdp->xdf_wce, (void *)arg, 1087 sizeof (vdp->xdf_wce), mode)) 1088 return (EFAULT); 1089 return (0); 1090 case DKIOCSETWCE: 1091 if (ddi_copyin((void *)arg, &vdp->xdf_wce, 1092 sizeof (vdp->xdf_wce), mode)) 1093 return (EFAULT); 1094 return (0); 1095 case DKIOCFLUSHWRITECACHE: { 1096 int rc; 1097 struct dk_callback *dkc = (struct dk_callback *)arg; 1098 1099 if (vdp->xdf_flush_supported) { 1100 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1101 NULL, 0, 0, (void *)dev); 1102 } else { 1103 if (xdf_barrier_flush_disable) 1104 return (ENOTTY); 1105 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1106 vdp->xdf_cache_flush_block, xdf_flush_block, 1107 DEV_BSIZE, (void *)dev); 1108 } 1109 if ((mode & FKIOCTL) && (dkc != NULL) && 1110 (dkc->dkc_callback != NULL)) { 1111 (*dkc->dkc_callback)(dkc->dkc_cookie, rc); 1112 /* need to return 0 after calling callback */ 1113 rc = 0; 1114 } 1115 return (rc); 1116 } 1117 1118 default: 1119 return (ENOTTY); 1120 } 1121 } 1122 1123 /* 1124 * xdf interrupt handler 1125 */ 1126 static uint_t 1127 xdf_intr(caddr_t arg) 1128 { 1129 xdf_t *vdp = (xdf_t *)arg; 1130 xendev_ring_t *xbr; 1131 blkif_response_t *resp; 1132 int bioerr = 0; 1133 uint64_t id; 1134 extern int do_polled_io; 1135 uint8_t op; 1136 uint16_t status; 1137 ddi_acc_handle_t acchdl; 1138 1139 mutex_enter(&vdp->xdf_dev_lk); 1140 1141 if ((xbr = vdp->xdf_xb_ring) == NULL) { 1142 mutex_exit(&vdp->xdf_dev_lk); 1143 return (DDI_INTR_UNCLAIMED); 1144 } 1145 1146 acchdl = vdp->xdf_xb_ring_hdl; 1147 1148 /* 1149 * complete all requests which have a response 1150 */ 1151 while (resp = xvdi_ring_get_response(xbr)) { 1152 id = ddi_get64(acchdl, &resp->id); 1153 op = ddi_get8(acchdl, &resp->operation); 1154 status = ddi_get16(acchdl, (uint16_t *)&resp->status); 1155 DPRINTF(INTR_DBG, ("resp: op %d id %"PRIu64" status %d\n", 1156 op, id, status)); 1157 1158 /* 1159 * XXPV - close connection to the backend and restart 1160 */ 1161 if (status != BLKIF_RSP_OKAY) { 1162 DPRINTF(IO_DBG, ("xdf@%s: I/O error while %s", 1163 ddi_get_name_addr(vdp->xdf_dip), 1164 (op == BLKIF_OP_READ) ? "reading" : "writing")); 1165 bioerr = EIO; 1166 } 1167 1168 xdf_iofini(vdp, id, bioerr); 1169 } 1170 1171 mutex_exit(&vdp->xdf_dev_lk); 1172 1173 if (!do_polled_io) 1174 xdf_iostart(vdp); 1175 1176 return (DDI_INTR_CLAIMED); 1177 } 1178 1179 int xdf_fbrewrites; /* how many times was our flush block rewritten */ 1180 1181 /* 1182 * Snarf new data if our flush block was re-written 1183 */ 1184 static void 1185 check_fbwrite(xdf_t *vdp, buf_t *bp, daddr_t blkno) 1186 { 1187 int nblks; 1188 boolean_t mapin; 1189 1190 if (IS_WRITE_BARRIER(vdp, bp)) 1191 return; /* write was a flush write */ 1192 1193 mapin = B_FALSE; 1194 nblks = bp->b_bcount >> DEV_BSHIFT; 1195 if (xdf_flush_block >= blkno && xdf_flush_block < (blkno + nblks)) { 1196 xdf_fbrewrites++; 1197 if (bp->b_flags & (B_PAGEIO | B_PHYS)) { 1198 mapin = B_TRUE; 1199 bp_mapin(bp); 1200 } 1201 bcopy(bp->b_un.b_addr + 1202 ((xdf_flush_block - blkno) << DEV_BSHIFT), 1203 vdp->xdf_cache_flush_block, DEV_BSIZE); 1204 if (mapin) 1205 bp_mapout(bp); 1206 } 1207 } 1208 1209 static void 1210 xdf_iofini(xdf_t *vdp, uint64_t id, int bioerr) 1211 { 1212 ge_slot_t *gs = (ge_slot_t *)(uintptr_t)id; 1213 v_req_t *vreq = gs->vreq; 1214 buf_t *bp = vreq->v_buf; 1215 1216 gs_free(vdp, gs); 1217 if (bioerr) 1218 bioerror(bp, bioerr); 1219 vreq->v_nslots--; 1220 if (vreq->v_nslots != 0) 1221 return; 1222 1223 XDF_UPDATE_IO_STAT(vdp, bp); 1224 kstat_runq_exit(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1225 1226 if (IS_ERROR(bp)) 1227 bp->b_resid = bp->b_bcount; 1228 1229 vreq_free(vdp, vreq); 1230 biodone(bp); 1231 } 1232 1233 /* 1234 * return value of xdf_prepare_rreq() 1235 * used in xdf_iostart() 1236 */ 1237 #define XF_PARTIAL 0 /* rreq is full, not all I/O in buf transferred */ 1238 #define XF_COMP 1 /* no more I/O left in buf */ 1239 1240 static void 1241 xdf_iostart(xdf_t *vdp) 1242 { 1243 xendev_ring_t *xbr; 1244 struct buf *bp; 1245 blkif_request_t *rreq; 1246 int retval; 1247 int rreqready = 0; 1248 1249 xbr = vdp->xdf_xb_ring; 1250 1251 /* 1252 * populate the ring request(s) 1253 * 1254 * loop until there is no buf to transfer or no free slot 1255 * available in I/O ring 1256 */ 1257 mutex_enter(&vdp->xdf_dev_lk); 1258 1259 for (;;) { 1260 if (vdp->xdf_status != XD_READY) 1261 break; 1262 1263 /* active buf queue empty? */ 1264 if ((bp = vdp->xdf_f_act) == NULL) 1265 break; 1266 1267 /* try to grab a vreq for this bp */ 1268 if ((BP2VREQ(bp) == NULL) && (vreq_get(vdp, bp) == NULL)) 1269 break; 1270 /* alloc DMA/GTE resources */ 1271 if (vreq_setup(vdp, BP2VREQ(bp)) != DDI_SUCCESS) 1272 break; 1273 1274 /* get next blkif_request in the ring */ 1275 if ((rreq = xvdi_ring_get_request(xbr)) == NULL) 1276 break; 1277 bzero(rreq, sizeof (blkif_request_t)); 1278 1279 /* populate blkif_request with this buf */ 1280 rreqready++; 1281 retval = xdf_prepare_rreq(vdp, bp, rreq); 1282 if (retval == XF_COMP) { 1283 /* finish this bp, switch to next one */ 1284 kstat_waitq_to_runq(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1285 vdp->xdf_f_act = bp->av_forw; 1286 bp->av_forw = NULL; 1287 } 1288 } 1289 1290 /* 1291 * Send the request(s) to the backend 1292 */ 1293 if (rreqready) { 1294 if (xvdi_ring_push_request(xbr)) { 1295 DPRINTF(IO_DBG, ("xdf_iostart: " 1296 "sent request(s) to backend\n")); 1297 xvdi_notify_oe(vdp->xdf_dip); 1298 } 1299 } 1300 1301 mutex_exit(&vdp->xdf_dev_lk); 1302 } 1303 1304 /* 1305 * populate a single blkif_request_t w/ a buf 1306 */ 1307 static int 1308 xdf_prepare_rreq(xdf_t *vdp, struct buf *bp, blkif_request_t *rreq) 1309 { 1310 int rval; 1311 grant_ref_t gr; 1312 uint8_t fsect, lsect; 1313 size_t bcnt; 1314 paddr_t dma_addr; 1315 off_t blk_off; 1316 dev_info_t *dip = vdp->xdf_dip; 1317 blkif_vdev_t vdev = xvdi_get_vdevnum(dip); 1318 v_req_t *vreq = BP2VREQ(bp); 1319 uint64_t blkno = vreq->v_blkno; 1320 uint_t ndmacs = vreq->v_ndmacs; 1321 ddi_acc_handle_t acchdl = vdp->xdf_xb_ring_hdl; 1322 int seg = 0; 1323 int isread = IS_READ(bp); 1324 1325 if (isread) 1326 ddi_put8(acchdl, &rreq->operation, BLKIF_OP_READ); 1327 else { 1328 switch (vreq->v_flush_diskcache) { 1329 case FLUSH_DISKCACHE: 1330 ddi_put8(acchdl, &rreq->operation, 1331 BLKIF_OP_FLUSH_DISKCACHE); 1332 ddi_put16(acchdl, &rreq->handle, vdev); 1333 ddi_put64(acchdl, &rreq->id, 1334 (uint64_t)(uintptr_t)(vreq->v_gs)); 1335 ddi_put8(acchdl, &rreq->nr_segments, 0); 1336 return (XF_COMP); 1337 case WRITE_BARRIER: 1338 ddi_put8(acchdl, &rreq->operation, 1339 BLKIF_OP_WRITE_BARRIER); 1340 break; 1341 default: 1342 if (!vdp->xdf_wce) 1343 ddi_put8(acchdl, &rreq->operation, 1344 BLKIF_OP_WRITE_BARRIER); 1345 else 1346 ddi_put8(acchdl, &rreq->operation, 1347 BLKIF_OP_WRITE); 1348 break; 1349 } 1350 } 1351 1352 ddi_put16(acchdl, &rreq->handle, vdev); 1353 ddi_put64(acchdl, &rreq->sector_number, blkno); 1354 ddi_put64(acchdl, &rreq->id, (uint64_t)(uintptr_t)(vreq->v_gs)); 1355 1356 /* 1357 * loop until all segments are populated or no more dma cookie in buf 1358 */ 1359 for (;;) { 1360 /* 1361 * Each segment of a blkif request can transfer up to 1362 * one 4K page of data. 1363 */ 1364 bcnt = vreq->v_dmac.dmac_size; 1365 ASSERT(bcnt <= PAGESIZE); 1366 ASSERT((bcnt % XB_BSIZE) == 0); 1367 dma_addr = vreq->v_dmac.dmac_laddress; 1368 blk_off = (uint_t)((paddr_t)XB_SEGOFFSET & dma_addr); 1369 ASSERT((blk_off & XB_BMASK) == 0); 1370 fsect = blk_off >> XB_BSHIFT; 1371 lsect = fsect + (bcnt >> XB_BSHIFT) - 1; 1372 ASSERT(fsect < XB_MAX_SEGLEN / XB_BSIZE && 1373 lsect < XB_MAX_SEGLEN / XB_BSIZE); 1374 DPRINTF(IO_DBG, (" ""seg%d: dmacS %lu blk_off %ld\n", 1375 seg, vreq->v_dmac.dmac_size, blk_off)); 1376 gr = gs_grant(vreq->v_gs, PATOMA(dma_addr) >> PAGESHIFT); 1377 ddi_put32(acchdl, &rreq->seg[seg].gref, gr); 1378 ddi_put8(acchdl, &rreq->seg[seg].first_sect, fsect); 1379 ddi_put8(acchdl, &rreq->seg[seg].last_sect, lsect); 1380 DPRINTF(IO_DBG, (" ""seg%d: fs %d ls %d gr %d dma 0x%"PRIx64 1381 "\n", seg, fsect, lsect, gr, dma_addr)); 1382 1383 blkno += (bcnt >> XB_BSHIFT); 1384 seg++; 1385 ASSERT(seg <= BLKIF_MAX_SEGMENTS_PER_REQUEST); 1386 if (--ndmacs) { 1387 ddi_dma_nextcookie(vreq->v_dmahdl, &vreq->v_dmac); 1388 continue; 1389 } 1390 1391 vreq->v_status = VREQ_DMAWIN_DONE; 1392 vreq->v_blkno = blkno; 1393 if (vreq->v_dmaw + 1 == vreq->v_ndmaws) 1394 /* last win */ 1395 rval = XF_COMP; 1396 else 1397 rval = XF_PARTIAL; 1398 break; 1399 } 1400 ddi_put8(acchdl, &rreq->nr_segments, seg); 1401 DPRINTF(IO_DBG, ("xdf_prepare_rreq: request id=%"PRIx64" ready\n", 1402 rreq->id)); 1403 1404 return (rval); 1405 } 1406 1407 #define XDF_QSEC 50000 /* .005 second */ 1408 #define XDF_POLLCNT 12 /* loop for 12 times before time out */ 1409 1410 static int 1411 xdf_drain_io(xdf_t *vdp) 1412 { 1413 int pollc, rval; 1414 xendev_ring_t *xbr; 1415 1416 if (xdfdebug & SUSRES_DBG) 1417 xen_printf("xdf_drain_io: start\n"); 1418 1419 mutex_enter(&vdp->xdf_dev_lk); 1420 1421 if ((vdp->xdf_status != XD_READY) && (vdp->xdf_status != XD_SUSPEND)) 1422 goto out; 1423 1424 rval = 0; 1425 xbr = vdp->xdf_xb_ring; 1426 ASSERT(xbr != NULL); 1427 1428 for (pollc = 0; pollc < XDF_POLLCNT; pollc++) { 1429 if (xvdi_ring_has_unconsumed_responses(xbr)) { 1430 mutex_exit(&vdp->xdf_dev_lk); 1431 (void) xdf_intr((caddr_t)vdp); 1432 mutex_enter(&vdp->xdf_dev_lk); 1433 } 1434 if (!xvdi_ring_has_incomp_request(xbr)) 1435 goto out; 1436 1437 (void) HYPERVISOR_yield(); 1438 /* 1439 * file-backed devices can be slow 1440 */ 1441 drv_usecwait(XDF_QSEC << pollc); 1442 } 1443 cmn_err(CE_WARN, "xdf_polled_io: timeout"); 1444 rval = EIO; 1445 out: 1446 mutex_exit(&vdp->xdf_dev_lk); 1447 if (xdfdebug & SUSRES_DBG) 1448 xen_printf("xdf_drain_io: end, err=%d\n", rval); 1449 return (rval); 1450 } 1451 1452 /* ARGSUSED5 */ 1453 static int 1454 xdf_lb_rdwr(dev_info_t *devi, uchar_t cmd, void *bufp, 1455 diskaddr_t start, size_t reqlen, void *tg_cookie) 1456 { 1457 xdf_t *vdp; 1458 struct buf *bp; 1459 int err = 0; 1460 1461 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1462 if (vdp == NULL) 1463 return (ENXIO); 1464 1465 if ((start + (reqlen >> DEV_BSHIFT)) > vdp->xdf_xdev_nblocks) 1466 return (EINVAL); 1467 1468 bp = getrbuf(KM_SLEEP); 1469 if (cmd == TG_READ) 1470 bp->b_flags = B_BUSY | B_READ; 1471 else 1472 bp->b_flags = B_BUSY | B_WRITE; 1473 bp->b_un.b_addr = bufp; 1474 bp->b_bcount = reqlen; 1475 bp->b_resid = 0; 1476 bp->b_blkno = start; 1477 bp->av_forw = NULL; 1478 bp->av_back = NULL; 1479 bp->b_edev = DDI_DEV_T_NONE; /* don't have dev_t */ 1480 1481 mutex_enter(&vdp->xdf_dev_lk); 1482 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1483 if (vdp->xdf_f_act == NULL) { 1484 vdp->xdf_f_act = vdp->xdf_l_act = bp; 1485 } else { 1486 vdp->xdf_l_act->av_forw = bp; 1487 vdp->xdf_l_act = bp; 1488 } 1489 mutex_exit(&vdp->xdf_dev_lk); 1490 xdf_iostart(vdp); 1491 err = biowait(bp); 1492 1493 ASSERT(bp->b_flags & B_DONE); 1494 1495 freerbuf(bp); 1496 return (err); 1497 } 1498 1499 /* 1500 * synthetic geometry 1501 */ 1502 #define XDF_NSECTS 256 1503 #define XDF_NHEADS 16 1504 1505 static int 1506 xdf_lb_getcap(dev_info_t *devi, diskaddr_t *capp) 1507 { 1508 xdf_t *vdp; 1509 1510 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1511 1512 if (vdp == NULL) 1513 return (ENXIO); 1514 1515 mutex_enter(&vdp->xdf_dev_lk); 1516 *capp = vdp->xdf_xdev_nblocks; 1517 DPRINTF(LBL_DBG, ("capacity %llu\n", *capp)); 1518 mutex_exit(&vdp->xdf_dev_lk); 1519 return (0); 1520 } 1521 1522 static int 1523 xdf_lb_getpgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1524 { 1525 xdf_t *vdp; 1526 uint_t ncyl; 1527 uint_t spc = XDF_NHEADS * XDF_NSECTS; 1528 1529 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1530 1531 if (vdp == NULL) 1532 return (ENXIO); 1533 1534 ncyl = vdp->xdf_xdev_nblocks / spc; 1535 1536 geomp->g_ncyl = ncyl == 0 ? 1 : ncyl; 1537 geomp->g_acyl = 0; 1538 geomp->g_nhead = XDF_NHEADS; 1539 geomp->g_secsize = XB_BSIZE; 1540 geomp->g_nsect = XDF_NSECTS; 1541 geomp->g_intrlv = 0; 1542 geomp->g_rpm = 7200; 1543 geomp->g_capacity = vdp->xdf_xdev_nblocks; 1544 return (0); 1545 } 1546 1547 /* 1548 * No real HBA, no geometry available from it 1549 */ 1550 /*ARGSUSED*/ 1551 static int 1552 xdf_lb_getvgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1553 { 1554 return (EINVAL); 1555 } 1556 1557 static int 1558 xdf_lb_getattribute(dev_info_t *devi, tg_attribute_t *tgattributep) 1559 { 1560 xdf_t *vdp; 1561 1562 if (!(vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)))) 1563 return (ENXIO); 1564 1565 if (XD_IS_RO(vdp)) 1566 tgattributep->media_is_writable = 0; 1567 else 1568 tgattributep->media_is_writable = 1; 1569 return (0); 1570 } 1571 1572 /* ARGSUSED3 */ 1573 static int 1574 xdf_lb_getinfo(dev_info_t *devi, int cmd, void *arg, void *tg_cookie) 1575 { 1576 switch (cmd) { 1577 case TG_GETPHYGEOM: 1578 return (xdf_lb_getpgeom(devi, (cmlb_geom_t *)arg)); 1579 case TG_GETVIRTGEOM: 1580 return (xdf_lb_getvgeom(devi, (cmlb_geom_t *)arg)); 1581 case TG_GETCAPACITY: 1582 return (xdf_lb_getcap(devi, (diskaddr_t *)arg)); 1583 case TG_GETBLOCKSIZE: 1584 *(uint32_t *)arg = XB_BSIZE; 1585 return (0); 1586 case TG_GETATTR: 1587 return (xdf_lb_getattribute(devi, (tg_attribute_t *)arg)); 1588 default: 1589 return (ENOTTY); 1590 } 1591 } 1592 1593 /* 1594 * Kick-off connect process 1595 * Status should be XD_UNKNOWN or XD_CLOSED 1596 * On success, status will be changed to XD_INIT 1597 * On error, status won't be changed 1598 */ 1599 static int 1600 xdf_start_connect(xdf_t *vdp) 1601 { 1602 char *xsnode; 1603 grant_ref_t gref; 1604 xenbus_transaction_t xbt; 1605 int rv; 1606 dev_info_t *dip = vdp->xdf_dip; 1607 1608 if ((vdp->xdf_peer = xvdi_get_oeid(dip)) == (domid_t)-1) 1609 goto errout; 1610 1611 if (xvdi_alloc_evtchn(dip) != DDI_SUCCESS) { 1612 cmn_err(CE_WARN, "xdf@%s: failed to alloc event channel", 1613 ddi_get_name_addr(dip)); 1614 goto errout; 1615 } 1616 if (ddi_add_intr(dip, 0, NULL, NULL, xdf_intr, (caddr_t)vdp) != 1617 DDI_SUCCESS) { 1618 cmn_err(CE_WARN, "xdf_start_connect: xdf@%s: " 1619 "failed to add intr handler", ddi_get_name_addr(dip)); 1620 goto errout1; 1621 } 1622 1623 if (xvdi_alloc_ring(dip, BLKIF_RING_SIZE, 1624 sizeof (union blkif_sring_entry), &gref, &vdp->xdf_xb_ring) != 1625 DDI_SUCCESS) { 1626 cmn_err(CE_WARN, "xdf@%s: failed to alloc comm ring", 1627 ddi_get_name_addr(dip)); 1628 goto errout2; 1629 } 1630 vdp->xdf_xb_ring_hdl = vdp->xdf_xb_ring->xr_acc_hdl; /* ugly!! */ 1631 1632 /* 1633 * Write into xenstore the info needed by backend 1634 */ 1635 if ((xsnode = xvdi_get_xsname(dip)) == NULL) { 1636 cmn_err(CE_WARN, "xdf@%s: " 1637 "failed to get xenstore node path", 1638 ddi_get_name_addr(dip)); 1639 goto fail_trans; 1640 } 1641 trans_retry: 1642 if (xenbus_transaction_start(&xbt)) { 1643 cmn_err(CE_WARN, "xdf@%s: failed to start transaction", 1644 ddi_get_name_addr(dip)); 1645 xvdi_fatal_error(dip, EIO, "transaction start"); 1646 goto fail_trans; 1647 } 1648 1649 if (rv = xenbus_printf(xbt, xsnode, "ring-ref", "%u", gref)) { 1650 cmn_err(CE_WARN, "xdf@%s: failed to write ring-ref", 1651 ddi_get_name_addr(dip)); 1652 xvdi_fatal_error(dip, rv, "writing ring-ref"); 1653 goto abort_trans; 1654 } 1655 1656 if (rv = xenbus_printf(xbt, xsnode, "event-channel", "%u", 1657 xvdi_get_evtchn(dip))) { 1658 cmn_err(CE_WARN, "xdf@%s: failed to write event-channel", 1659 ddi_get_name_addr(dip)); 1660 xvdi_fatal_error(dip, rv, "writing event-channel"); 1661 goto abort_trans; 1662 } 1663 1664 if ((rv = xvdi_switch_state(dip, xbt, XenbusStateInitialised)) > 0) { 1665 cmn_err(CE_WARN, "xdf@%s: " 1666 "failed to switch state to XenbusStateInitialised", 1667 ddi_get_name_addr(dip)); 1668 xvdi_fatal_error(dip, rv, "writing state"); 1669 goto abort_trans; 1670 } 1671 1672 /* kick-off connect process */ 1673 if (rv = xenbus_transaction_end(xbt, 0)) { 1674 if (rv == EAGAIN) 1675 goto trans_retry; 1676 cmn_err(CE_WARN, "xdf@%s: failed to end transaction", 1677 ddi_get_name_addr(dip)); 1678 xvdi_fatal_error(dip, rv, "completing transaction"); 1679 goto fail_trans; 1680 } 1681 1682 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1683 mutex_enter(&vdp->xdf_dev_lk); 1684 vdp->xdf_status = XD_INIT; 1685 mutex_exit(&vdp->xdf_dev_lk); 1686 1687 return (DDI_SUCCESS); 1688 1689 abort_trans: 1690 (void) xenbus_transaction_end(xbt, 1); 1691 fail_trans: 1692 xvdi_free_ring(vdp->xdf_xb_ring); 1693 errout2: 1694 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 1695 errout1: 1696 xvdi_free_evtchn(dip); 1697 errout: 1698 cmn_err(CE_WARN, "xdf@%s: fail to kick-off connecting", 1699 ddi_get_name_addr(dip)); 1700 return (DDI_FAILURE); 1701 } 1702 1703 /* 1704 * Kick-off disconnect process 1705 * Status won't be changed 1706 */ 1707 static int 1708 xdf_start_disconnect(xdf_t *vdp) 1709 { 1710 if (xvdi_switch_state(vdp->xdf_dip, XBT_NULL, XenbusStateClosed) > 0) { 1711 cmn_err(CE_WARN, "xdf@%s: fail to kick-off disconnecting", 1712 ddi_get_name_addr(vdp->xdf_dip)); 1713 return (DDI_FAILURE); 1714 } 1715 1716 return (DDI_SUCCESS); 1717 } 1718 1719 int 1720 xdf_get_flush_block(xdf_t *vdp) 1721 { 1722 /* 1723 * Get a DEV_BSIZE aligned bufer 1724 */ 1725 vdp->xdf_flush_mem = kmem_alloc(DEV_BSIZE * 2, KM_SLEEP); 1726 vdp->xdf_cache_flush_block = 1727 (char *)P2ROUNDUP((uintptr_t)(vdp->xdf_flush_mem), DEV_BSIZE); 1728 if (xdf_lb_rdwr(vdp->xdf_dip, TG_READ, vdp->xdf_cache_flush_block, 1729 xdf_flush_block, DEV_BSIZE, NULL) != 0) 1730 return (DDI_FAILURE); 1731 return (DDI_SUCCESS); 1732 } 1733 1734 /* 1735 * Finish other initialization after we've connected to backend 1736 * Status should be XD_INIT before calling this routine 1737 * On success, status should be changed to XD_READY 1738 * On error, status should stay XD_INIT 1739 */ 1740 static int 1741 xdf_post_connect(xdf_t *vdp) 1742 { 1743 int rv; 1744 uint_t len; 1745 char *type; 1746 char *barrier; 1747 dev_info_t *devi = vdp->xdf_dip; 1748 1749 /* 1750 * Determine if feature barrier is supported by backend 1751 */ 1752 if (xenbus_read(XBT_NULL, xvdi_get_oename(devi), 1753 "feature-barrier", (void **)&barrier, &len) == 0) { 1754 vdp->xdf_feature_barrier = 1; 1755 kmem_free(barrier, len); 1756 } else { 1757 cmn_err(CE_NOTE, "xdf@%s: failed to read feature-barrier", 1758 ddi_get_name_addr(vdp->xdf_dip)); 1759 vdp->xdf_feature_barrier = 0; 1760 } 1761 1762 /* probe backend */ 1763 if (rv = xenbus_gather(XBT_NULL, xvdi_get_oename(devi), 1764 "sectors", "%"SCNu64, &vdp->xdf_xdev_nblocks, 1765 "info", "%u", &vdp->xdf_xdev_info, NULL)) { 1766 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1767 "cannot read backend info", ddi_get_name_addr(devi)); 1768 xvdi_fatal_error(devi, rv, "reading backend info"); 1769 return (DDI_FAILURE); 1770 } 1771 1772 /* fix disk type */ 1773 if (xenbus_read(XBT_NULL, xvdi_get_xsname(devi), "device-type", 1774 (void **)&type, &len) != 0) { 1775 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1776 "cannot read device-type", ddi_get_name_addr(devi)); 1777 xvdi_fatal_error(devi, rv, "reading device-type"); 1778 return (DDI_FAILURE); 1779 } 1780 if (strcmp(type, "cdrom") == 0) 1781 vdp->xdf_xdev_info |= VDISK_CDROM; 1782 kmem_free(type, len); 1783 1784 /* 1785 * We've created all the minor nodes via cmlb_attach() using default 1786 * value in xdf_attach() to make it possbile to block in xdf_open(), 1787 * in case there's anyone (say, booting thread) ever trying to open 1788 * it before connected to backend. We will refresh all those minor 1789 * nodes w/ latest info we've got now when we are almost connected. 1790 * 1791 * Don't do this when xdf is already opened by someone (could happen 1792 * during resume), for that cmlb_attach() will invalid the label info 1793 * and confuse those who has already opened the node, which is bad. 1794 */ 1795 if (!xdf_isopen(vdp, -1) && (XD_IS_CD(vdp) || XD_IS_RM(vdp))) { 1796 /* re-init cmlb w/ latest info we got from backend */ 1797 if (cmlb_attach(devi, &xdf_lb_ops, 1798 XD_IS_CD(vdp) ? DTYPE_RODIRECT : DTYPE_DIRECT, 1799 XD_IS_RM(vdp), 1, DDI_NT_BLOCK, 1800 CMLB_FAKE_LABEL_ONE_PARTITION, 1801 vdp->xdf_vd_lbl, NULL) != 0) { 1802 cmn_err(CE_WARN, "xdf@%s: cmlb attach failed", 1803 ddi_get_name_addr(devi)); 1804 return (DDI_FAILURE); 1805 } 1806 } 1807 1808 /* mark vbd is ready for I/O */ 1809 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1810 mutex_enter(&vdp->xdf_dev_lk); 1811 vdp->xdf_status = XD_READY; 1812 mutex_exit(&vdp->xdf_dev_lk); 1813 /* 1814 * If backend has feature-barrier, see if it supports disk 1815 * cache flush op. 1816 */ 1817 vdp->xdf_flush_supported = 0; 1818 if (vdp->xdf_feature_barrier) { 1819 /* 1820 * Pretend we already know flush is supported so probe 1821 * will attempt the correct op. 1822 */ 1823 vdp->xdf_flush_supported = 1; 1824 if (xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, NULL, 0, 0, 0) == 0) { 1825 vdp->xdf_flush_supported = 1; 1826 } else { 1827 vdp->xdf_flush_supported = 0; 1828 /* 1829 * If the other end does not support the cache flush op 1830 * then we must use a barrier-write to force disk 1831 * cache flushing. Barrier writes require that a data 1832 * block actually be written. 1833 * Cache a block to barrier-write when we are 1834 * asked to perform a flush. 1835 * XXX - would it be better to just copy 1 block 1836 * (512 bytes) from whatever write we did last 1837 * and rewrite that block? 1838 */ 1839 if (xdf_get_flush_block(vdp) != DDI_SUCCESS) 1840 return (DDI_FAILURE); 1841 } 1842 } 1843 1844 cmn_err(CE_CONT, "?xdf@%s: %"PRIu64" blocks", ddi_get_name_addr(devi), 1845 (uint64_t)vdp->xdf_xdev_nblocks); 1846 1847 return (DDI_SUCCESS); 1848 } 1849 1850 /* 1851 * Finish other uninitialization after we've disconnected from backend 1852 * when status is XD_CLOSING or XD_INIT. After returns, status is XD_CLOSED 1853 */ 1854 static void 1855 xdf_post_disconnect(xdf_t *vdp) 1856 { 1857 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 1858 xvdi_free_evtchn(vdp->xdf_dip); 1859 xvdi_free_ring(vdp->xdf_xb_ring); 1860 vdp->xdf_xb_ring = NULL; 1861 vdp->xdf_xb_ring_hdl = NULL; 1862 vdp->xdf_peer = (domid_t)-1; 1863 1864 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1865 mutex_enter(&vdp->xdf_dev_lk); 1866 vdp->xdf_status = XD_CLOSED; 1867 mutex_exit(&vdp->xdf_dev_lk); 1868 } 1869 1870 /*ARGSUSED*/ 1871 static void 1872 xdf_oe_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) 1873 { 1874 XenbusState new_state = *(XenbusState *)impl_data; 1875 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 1876 boolean_t unexpect_die = B_FALSE; 1877 int status; 1878 1879 DPRINTF(DDI_DBG, ("xdf@%s: otherend state change to %d!\n", 1880 ddi_get_name_addr(dip), new_state)); 1881 1882 mutex_enter(&vdp->xdf_cb_lk); 1883 1884 if (xdf_check_state_transition(vdp, new_state) == DDI_FAILURE) { 1885 mutex_exit(&vdp->xdf_cb_lk); 1886 return; 1887 } 1888 1889 switch (new_state) { 1890 case XenbusStateInitialising: 1891 ASSERT(vdp->xdf_status == XD_CLOSED); 1892 /* 1893 * backend recovered from a previous failure, 1894 * kick-off connect process again 1895 */ 1896 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 1897 cmn_err(CE_WARN, "xdf@%s:" 1898 " failed to start reconnecting to backend", 1899 ddi_get_name_addr(dip)); 1900 } 1901 break; 1902 case XenbusStateConnected: 1903 ASSERT(vdp->xdf_status == XD_INIT); 1904 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected); 1905 /* finish final init after connect */ 1906 if (xdf_post_connect(vdp) != DDI_SUCCESS) 1907 (void) xdf_start_disconnect(vdp); 1908 break; 1909 case XenbusStateClosing: 1910 if (vdp->xdf_status == XD_READY) { 1911 mutex_enter(&vdp->xdf_dev_lk); 1912 if (xdf_isopen(vdp, -1)) { 1913 cmn_err(CE_NOTE, "xdf@%s: hot-unplug failed, " 1914 "still in use", ddi_get_name_addr(dip)); 1915 mutex_exit(&vdp->xdf_dev_lk); 1916 break; 1917 } else { 1918 vdp->xdf_status = XD_CLOSING; 1919 } 1920 mutex_exit(&vdp->xdf_dev_lk); 1921 } 1922 (void) xdf_start_disconnect(vdp); 1923 break; 1924 case XenbusStateClosed: 1925 /* first check if BE closed unexpectedly */ 1926 mutex_enter(&vdp->xdf_dev_lk); 1927 if (xdf_isopen(vdp, -1)) { 1928 unexpect_die = B_TRUE; 1929 unexpectedie(vdp); 1930 cmn_err(CE_WARN, "xdf@%s: backend closed, " 1931 "reconnecting...", ddi_get_name_addr(dip)); 1932 } 1933 mutex_exit(&vdp->xdf_dev_lk); 1934 1935 if (vdp->xdf_status == XD_READY) { 1936 mutex_enter(&vdp->xdf_dev_lk); 1937 vdp->xdf_status = XD_CLOSING; 1938 mutex_exit(&vdp->xdf_dev_lk); 1939 1940 #ifdef DOMU_BACKEND 1941 (void) xvdi_post_event(dip, XEN_HP_REMOVE); 1942 #endif 1943 1944 xdf_post_disconnect(vdp); 1945 (void) xvdi_switch_state(dip, XBT_NULL, 1946 XenbusStateClosed); 1947 } else if ((vdp->xdf_status == XD_INIT) || 1948 (vdp->xdf_status == XD_CLOSING)) { 1949 xdf_post_disconnect(vdp); 1950 } else { 1951 mutex_enter(&vdp->xdf_dev_lk); 1952 vdp->xdf_status = XD_CLOSED; 1953 mutex_exit(&vdp->xdf_dev_lk); 1954 } 1955 } 1956 1957 /* notify anybody waiting for oe state change */ 1958 mutex_enter(&vdp->xdf_dev_lk); 1959 cv_broadcast(&vdp->xdf_dev_cv); 1960 mutex_exit(&vdp->xdf_dev_lk); 1961 1962 status = vdp->xdf_status; 1963 mutex_exit(&vdp->xdf_cb_lk); 1964 1965 if (status == XD_READY) { 1966 xdf_iostart(vdp); 1967 } else if ((status == XD_CLOSED) && !unexpect_die) { 1968 /* interface is closed successfully, remove all minor nodes */ 1969 cmlb_detach(vdp->xdf_vd_lbl, NULL); 1970 cmlb_free_handle(&vdp->xdf_vd_lbl); 1971 } 1972 } 1973 1974 /* check if partition is open, -1 - check all partitions on the disk */ 1975 static boolean_t 1976 xdf_isopen(xdf_t *vdp, int partition) 1977 { 1978 int i; 1979 ulong_t parbit; 1980 boolean_t rval = B_FALSE; 1981 1982 if (partition == -1) 1983 parbit = (ulong_t)-1; 1984 else 1985 parbit = 1 << partition; 1986 1987 for (i = 0; i < OTYPCNT; i++) { 1988 if (vdp->xdf_vd_open[i] & parbit) 1989 rval = B_TRUE; 1990 } 1991 1992 return (rval); 1993 } 1994 1995 /* 1996 * Xdf_check_state_transition will check the XenbusState change to see 1997 * if the change is a valid transition or not. 1998 * The new state is written by backend domain, or by running xenstore-write 1999 * to change it manually in dom0 2000 */ 2001 static int 2002 xdf_check_state_transition(xdf_t *vdp, XenbusState oestate) 2003 { 2004 int status; 2005 int stcheck; 2006 #define STOK 0 /* need further process */ 2007 #define STNOP 1 /* no action need taking */ 2008 #define STBUG 2 /* unexpected state change, could be a bug */ 2009 2010 status = vdp->xdf_status; 2011 stcheck = STOK; 2012 2013 switch (status) { 2014 case XD_UNKNOWN: 2015 if ((oestate == XenbusStateUnknown) || 2016 (oestate == XenbusStateConnected)) 2017 stcheck = STBUG; 2018 else if ((oestate == XenbusStateInitialising) || 2019 (oestate == XenbusStateInitWait) || 2020 (oestate == XenbusStateInitialised)) 2021 stcheck = STNOP; 2022 break; 2023 case XD_INIT: 2024 if (oestate == XenbusStateUnknown) 2025 stcheck = STBUG; 2026 else if ((oestate == XenbusStateInitialising) || 2027 (oestate == XenbusStateInitWait) || 2028 (oestate == XenbusStateInitialised)) 2029 stcheck = STNOP; 2030 break; 2031 case XD_READY: 2032 if ((oestate == XenbusStateUnknown) || 2033 (oestate == XenbusStateInitialising) || 2034 (oestate == XenbusStateInitWait) || 2035 (oestate == XenbusStateInitialised)) 2036 stcheck = STBUG; 2037 else if (oestate == XenbusStateConnected) 2038 stcheck = STNOP; 2039 break; 2040 case XD_CLOSING: 2041 if ((oestate == XenbusStateUnknown) || 2042 (oestate == XenbusStateInitialising) || 2043 (oestate == XenbusStateInitWait) || 2044 (oestate == XenbusStateInitialised) || 2045 (oestate == XenbusStateConnected)) 2046 stcheck = STBUG; 2047 else if (oestate == XenbusStateClosing) 2048 stcheck = STNOP; 2049 break; 2050 case XD_CLOSED: 2051 if ((oestate == XenbusStateUnknown) || 2052 (oestate == XenbusStateConnected)) 2053 stcheck = STBUG; 2054 else if ((oestate == XenbusStateInitWait) || 2055 (oestate == XenbusStateInitialised) || 2056 (oestate == XenbusStateClosing) || 2057 (oestate == XenbusStateClosed)) 2058 stcheck = STNOP; 2059 break; 2060 case XD_SUSPEND: 2061 default: 2062 stcheck = STBUG; 2063 } 2064 2065 if (stcheck == STOK) 2066 return (DDI_SUCCESS); 2067 2068 if (stcheck == STBUG) 2069 cmn_err(CE_NOTE, "xdf@%s: unexpected otherend " 2070 "state change to %d!, when status is %d", 2071 ddi_get_name_addr(vdp->xdf_dip), oestate, status); 2072 2073 return (DDI_FAILURE); 2074 } 2075 2076 static int 2077 xdf_connect(xdf_t *vdp, boolean_t wait) 2078 { 2079 ASSERT(mutex_owned(&vdp->xdf_dev_lk)); 2080 while (vdp->xdf_status != XD_READY) { 2081 if (!wait || (vdp->xdf_status > XD_READY)) 2082 break; 2083 2084 if (cv_wait_sig(&vdp->xdf_dev_cv, &vdp->xdf_dev_lk) == 0) 2085 break; 2086 } 2087 2088 return (vdp->xdf_status); 2089 } 2090 2091 /* 2092 * callback func when DMA/GTE resources is available 2093 * 2094 * Note: we only register one callback function to grant table subsystem 2095 * since we only have one 'struct gnttab_free_callback' in xdf_t. 2096 */ 2097 static int 2098 xdf_dmacallback(caddr_t arg) 2099 { 2100 xdf_t *vdp = (xdf_t *)arg; 2101 ASSERT(vdp != NULL); 2102 2103 DPRINTF(DMA_DBG, ("xdf@%s: DMA callback started\n", 2104 ddi_get_name_addr(vdp->xdf_dip))); 2105 2106 ddi_trigger_softintr(vdp->xdf_softintr_id); 2107 return (DDI_DMA_CALLBACK_DONE); 2108 } 2109 2110 static uint_t 2111 xdf_iorestart(caddr_t arg) 2112 { 2113 xdf_t *vdp = (xdf_t *)arg; 2114 2115 ASSERT(vdp != NULL); 2116 2117 mutex_enter(&vdp->xdf_dev_lk); 2118 ASSERT(ISDMACBON(vdp)); 2119 SETDMACBOFF(vdp); 2120 mutex_exit(&vdp->xdf_dev_lk); 2121 2122 xdf_iostart(vdp); 2123 2124 return (DDI_INTR_CLAIMED); 2125 } 2126 2127 static void 2128 xdf_timeout_handler(void *arg) 2129 { 2130 xdf_t *vdp = arg; 2131 2132 mutex_enter(&vdp->xdf_dev_lk); 2133 vdp->xdf_timeout_id = 0; 2134 mutex_exit(&vdp->xdf_dev_lk); 2135 2136 /* new timeout thread could be re-scheduled */ 2137 xdf_iostart(vdp); 2138 } 2139 2140 /* 2141 * Alloc a vreq for this bp 2142 * bp->av_back contains the pointer to the vreq upon return 2143 */ 2144 static v_req_t * 2145 vreq_get(xdf_t *vdp, buf_t *bp) 2146 { 2147 v_req_t *vreq = NULL; 2148 2149 ASSERT(BP2VREQ(bp) == NULL); 2150 2151 vreq = kmem_cache_alloc(xdf_vreq_cache, KM_NOSLEEP); 2152 if (vreq == NULL) { 2153 if (vdp->xdf_timeout_id == 0) 2154 /* restart I/O after one second */ 2155 vdp->xdf_timeout_id = 2156 timeout(xdf_timeout_handler, vdp, hz); 2157 return (NULL); 2158 } 2159 bzero(vreq, sizeof (v_req_t)); 2160 2161 list_insert_head(&vdp->xdf_vreq_act, (void *)vreq); 2162 bp->av_back = (buf_t *)vreq; 2163 vreq->v_buf = bp; 2164 vreq->v_status = VREQ_INIT; 2165 /* init of other fields in vreq is up to the caller */ 2166 2167 return (vreq); 2168 } 2169 2170 static void 2171 vreq_free(xdf_t *vdp, v_req_t *vreq) 2172 { 2173 buf_t *bp = vreq->v_buf; 2174 2175 list_remove(&vdp->xdf_vreq_act, (void *)vreq); 2176 2177 if (vreq->v_flush_diskcache == FLUSH_DISKCACHE) 2178 goto done; 2179 2180 switch (vreq->v_status) { 2181 case VREQ_DMAWIN_DONE: 2182 case VREQ_GS_ALLOCED: 2183 case VREQ_DMABUF_BOUND: 2184 (void) ddi_dma_unbind_handle(vreq->v_dmahdl); 2185 /*FALLTHRU*/ 2186 case VREQ_DMAMEM_ALLOCED: 2187 if (!ALIGNED_XFER(bp)) { 2188 ASSERT(vreq->v_abuf != NULL); 2189 if (!IS_ERROR(bp) && IS_READ(bp)) 2190 bcopy(vreq->v_abuf, bp->b_un.b_addr, 2191 bp->b_bcount); 2192 ddi_dma_mem_free(&vreq->v_align); 2193 } 2194 /*FALLTHRU*/ 2195 case VREQ_MEMDMAHDL_ALLOCED: 2196 if (!ALIGNED_XFER(bp)) 2197 ddi_dma_free_handle(&vreq->v_memdmahdl); 2198 /*FALLTHRU*/ 2199 case VREQ_DMAHDL_ALLOCED: 2200 ddi_dma_free_handle(&vreq->v_dmahdl); 2201 break; 2202 default: 2203 break; 2204 } 2205 done: 2206 vreq->v_buf->av_back = NULL; 2207 kmem_cache_free(xdf_vreq_cache, vreq); 2208 } 2209 2210 /* 2211 * Initalize the DMA and grant table resources for the buf 2212 */ 2213 static int 2214 vreq_setup(xdf_t *vdp, v_req_t *vreq) 2215 { 2216 int rc; 2217 ddi_dma_attr_t dmaattr; 2218 uint_t ndcs, ndws; 2219 ddi_dma_handle_t dh; 2220 ddi_dma_handle_t mdh; 2221 ddi_dma_cookie_t dc; 2222 ddi_acc_handle_t abh; 2223 caddr_t aba; 2224 ge_slot_t *gs; 2225 size_t bufsz; 2226 off_t off; 2227 size_t sz; 2228 buf_t *bp = vreq->v_buf; 2229 int dma_flags = (IS_READ(bp) ? DDI_DMA_READ : DDI_DMA_WRITE) | 2230 DDI_DMA_STREAMING | DDI_DMA_PARTIAL; 2231 2232 switch (vreq->v_status) { 2233 case VREQ_INIT: 2234 if (IS_FLUSH_DISKCACHE(bp)) { 2235 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2236 DPRINTF(DMA_DBG, ( 2237 "xdf@%s: get ge_slotfailed\n", 2238 ddi_get_name_addr(vdp->xdf_dip))); 2239 return (DDI_FAILURE); 2240 } 2241 vreq->v_blkno = 0; 2242 vreq->v_nslots = 1; 2243 vreq->v_gs = gs; 2244 vreq->v_flush_diskcache = FLUSH_DISKCACHE; 2245 vreq->v_status = VREQ_GS_ALLOCED; 2246 gs->vreq = vreq; 2247 return (DDI_SUCCESS); 2248 } 2249 2250 if (IS_WRITE_BARRIER(vdp, bp)) 2251 vreq->v_flush_diskcache = WRITE_BARRIER; 2252 vreq->v_blkno = bp->b_blkno + 2253 (diskaddr_t)(uintptr_t)bp->b_private; 2254 bp->b_private = NULL; 2255 /* See if we wrote new data to our flush block */ 2256 if (!IS_READ(bp) && USE_WRITE_BARRIER(vdp)) 2257 check_fbwrite(vdp, bp, vreq->v_blkno); 2258 vreq->v_status = VREQ_INIT_DONE; 2259 /*FALLTHRU*/ 2260 2261 case VREQ_INIT_DONE: 2262 /* 2263 * alloc DMA handle 2264 */ 2265 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &xb_dma_attr, 2266 xdf_dmacallback, (caddr_t)vdp, &dh); 2267 if (rc != DDI_SUCCESS) { 2268 SETDMACBON(vdp); 2269 DPRINTF(DMA_DBG, ("xdf@%s: DMA handle alloc failed\n", 2270 ddi_get_name_addr(vdp->xdf_dip))); 2271 return (DDI_FAILURE); 2272 } 2273 2274 vreq->v_dmahdl = dh; 2275 vreq->v_status = VREQ_DMAHDL_ALLOCED; 2276 /*FALLTHRU*/ 2277 2278 case VREQ_DMAHDL_ALLOCED: 2279 /* 2280 * alloc dma handle for 512-byte aligned buf 2281 */ 2282 if (!ALIGNED_XFER(bp)) { 2283 /* 2284 * XXPV: we need to temporarily enlarge the seg 2285 * boundary and s/g length to work round CR6381968 2286 */ 2287 dmaattr = xb_dma_attr; 2288 dmaattr.dma_attr_seg = (uint64_t)-1; 2289 dmaattr.dma_attr_sgllen = INT_MAX; 2290 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &dmaattr, 2291 xdf_dmacallback, (caddr_t)vdp, &mdh); 2292 if (rc != DDI_SUCCESS) { 2293 SETDMACBON(vdp); 2294 DPRINTF(DMA_DBG, ("xdf@%s: unaligned buf DMA" 2295 "handle alloc failed\n", 2296 ddi_get_name_addr(vdp->xdf_dip))); 2297 return (DDI_FAILURE); 2298 } 2299 vreq->v_memdmahdl = mdh; 2300 vreq->v_status = VREQ_MEMDMAHDL_ALLOCED; 2301 } 2302 /*FALLTHRU*/ 2303 2304 case VREQ_MEMDMAHDL_ALLOCED: 2305 /* 2306 * alloc 512-byte aligned buf 2307 */ 2308 if (!ALIGNED_XFER(bp)) { 2309 if (bp->b_flags & (B_PAGEIO | B_PHYS)) 2310 bp_mapin(bp); 2311 2312 rc = ddi_dma_mem_alloc(vreq->v_memdmahdl, 2313 roundup(bp->b_bcount, XB_BSIZE), &xc_acc_attr, 2314 DDI_DMA_STREAMING, xdf_dmacallback, (caddr_t)vdp, 2315 &aba, &bufsz, &abh); 2316 if (rc != DDI_SUCCESS) { 2317 SETDMACBON(vdp); 2318 DPRINTF(DMA_DBG, ( 2319 "xdf@%s: DMA mem allocation failed\n", 2320 ddi_get_name_addr(vdp->xdf_dip))); 2321 return (DDI_FAILURE); 2322 } 2323 2324 vreq->v_abuf = aba; 2325 vreq->v_align = abh; 2326 vreq->v_status = VREQ_DMAMEM_ALLOCED; 2327 2328 ASSERT(bufsz >= bp->b_bcount); 2329 if (!IS_READ(bp)) 2330 bcopy(bp->b_un.b_addr, vreq->v_abuf, 2331 bp->b_bcount); 2332 } 2333 /*FALLTHRU*/ 2334 2335 case VREQ_DMAMEM_ALLOCED: 2336 /* 2337 * dma bind 2338 */ 2339 if (ALIGNED_XFER(bp)) { 2340 rc = ddi_dma_buf_bind_handle(vreq->v_dmahdl, bp, 2341 dma_flags, xdf_dmacallback, (caddr_t)vdp, 2342 &dc, &ndcs); 2343 } else { 2344 rc = ddi_dma_addr_bind_handle(vreq->v_dmahdl, 2345 NULL, vreq->v_abuf, bp->b_bcount, dma_flags, 2346 xdf_dmacallback, (caddr_t)vdp, &dc, &ndcs); 2347 } 2348 if (rc == DDI_DMA_MAPPED || rc == DDI_DMA_PARTIAL_MAP) { 2349 /* get num of dma windows */ 2350 if (rc == DDI_DMA_PARTIAL_MAP) { 2351 rc = ddi_dma_numwin(vreq->v_dmahdl, &ndws); 2352 ASSERT(rc == DDI_SUCCESS); 2353 } else { 2354 ndws = 1; 2355 } 2356 } else { 2357 SETDMACBON(vdp); 2358 DPRINTF(DMA_DBG, ("xdf@%s: DMA bind failed\n", 2359 ddi_get_name_addr(vdp->xdf_dip))); 2360 return (DDI_FAILURE); 2361 } 2362 2363 vreq->v_dmac = dc; 2364 vreq->v_dmaw = 0; 2365 vreq->v_ndmacs = ndcs; 2366 vreq->v_ndmaws = ndws; 2367 vreq->v_nslots = ndws; 2368 vreq->v_status = VREQ_DMABUF_BOUND; 2369 /*FALLTHRU*/ 2370 2371 case VREQ_DMABUF_BOUND: 2372 /* 2373 * get ge_slot, callback is set upon failure from gs_get(), 2374 * if not set previously 2375 */ 2376 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2377 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2378 ddi_get_name_addr(vdp->xdf_dip))); 2379 return (DDI_FAILURE); 2380 } 2381 2382 vreq->v_gs = gs; 2383 gs->vreq = vreq; 2384 vreq->v_status = VREQ_GS_ALLOCED; 2385 break; 2386 2387 case VREQ_GS_ALLOCED: 2388 /* nothing need to be done */ 2389 break; 2390 2391 case VREQ_DMAWIN_DONE: 2392 /* 2393 * move to the next dma window 2394 */ 2395 ASSERT((vreq->v_dmaw + 1) < vreq->v_ndmaws); 2396 2397 /* get a ge_slot for this DMA window */ 2398 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2399 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2400 ddi_get_name_addr(vdp->xdf_dip))); 2401 return (DDI_FAILURE); 2402 } 2403 2404 vreq->v_gs = gs; 2405 gs->vreq = vreq; 2406 vreq->v_dmaw++; 2407 rc = ddi_dma_getwin(vreq->v_dmahdl, vreq->v_dmaw, &off, &sz, 2408 &vreq->v_dmac, &vreq->v_ndmacs); 2409 ASSERT(rc == DDI_SUCCESS); 2410 vreq->v_status = VREQ_GS_ALLOCED; 2411 break; 2412 2413 default: 2414 return (DDI_FAILURE); 2415 } 2416 2417 return (DDI_SUCCESS); 2418 } 2419 2420 static ge_slot_t * 2421 gs_get(xdf_t *vdp, int isread) 2422 { 2423 grant_ref_t gh; 2424 ge_slot_t *gs; 2425 2426 /* try to alloc GTEs needed in this slot, first */ 2427 if (gnttab_alloc_grant_references( 2428 BLKIF_MAX_SEGMENTS_PER_REQUEST, &gh) == -1) { 2429 if (vdp->xdf_gnt_callback.next == NULL) { 2430 SETDMACBON(vdp); 2431 gnttab_request_free_callback( 2432 &vdp->xdf_gnt_callback, 2433 (void (*)(void *))xdf_dmacallback, 2434 (void *)vdp, 2435 BLKIF_MAX_SEGMENTS_PER_REQUEST); 2436 } 2437 return (NULL); 2438 } 2439 2440 gs = kmem_cache_alloc(xdf_gs_cache, KM_NOSLEEP); 2441 if (gs == NULL) { 2442 gnttab_free_grant_references(gh); 2443 if (vdp->xdf_timeout_id == 0) 2444 /* restart I/O after one second */ 2445 vdp->xdf_timeout_id = 2446 timeout(xdf_timeout_handler, vdp, hz); 2447 return (NULL); 2448 } 2449 2450 /* init gs_slot */ 2451 list_insert_head(&vdp->xdf_gs_act, (void *)gs); 2452 gs->oeid = vdp->xdf_peer; 2453 gs->isread = isread; 2454 gs->ghead = gh; 2455 gs->ngrefs = 0; 2456 2457 return (gs); 2458 } 2459 2460 static void 2461 gs_free(xdf_t *vdp, ge_slot_t *gs) 2462 { 2463 int i; 2464 grant_ref_t *gp = gs->ge; 2465 int ngrefs = gs->ngrefs; 2466 boolean_t isread = gs->isread; 2467 2468 list_remove(&vdp->xdf_gs_act, (void *)gs); 2469 2470 /* release all grant table entry resources used in this slot */ 2471 for (i = 0; i < ngrefs; i++, gp++) 2472 gnttab_end_foreign_access(*gp, !isread, 0); 2473 gnttab_free_grant_references(gs->ghead); 2474 2475 kmem_cache_free(xdf_gs_cache, (void *)gs); 2476 } 2477 2478 static grant_ref_t 2479 gs_grant(ge_slot_t *gs, mfn_t mfn) 2480 { 2481 grant_ref_t gr = gnttab_claim_grant_reference(&gs->ghead); 2482 2483 ASSERT(gr != -1); 2484 ASSERT(gs->ngrefs < BLKIF_MAX_SEGMENTS_PER_REQUEST); 2485 gs->ge[gs->ngrefs++] = gr; 2486 gnttab_grant_foreign_access_ref(gr, gs->oeid, mfn, !gs->isread); 2487 2488 return (gr); 2489 } 2490 2491 static void 2492 unexpectedie(xdf_t *vdp) 2493 { 2494 /* clean up I/Os in ring that have responses */ 2495 if (xvdi_ring_has_unconsumed_responses(vdp->xdf_xb_ring)) { 2496 mutex_exit(&vdp->xdf_dev_lk); 2497 (void) xdf_intr((caddr_t)vdp); 2498 mutex_enter(&vdp->xdf_dev_lk); 2499 } 2500 2501 /* free up all grant table entries */ 2502 while (!list_is_empty(&vdp->xdf_gs_act)) 2503 gs_free(vdp, list_head(&vdp->xdf_gs_act)); 2504 2505 /* 2506 * move bp back to active list orderly 2507 * vreq_busy is updated in vreq_free() 2508 */ 2509 while (!list_is_empty(&vdp->xdf_vreq_act)) { 2510 v_req_t *vreq = list_head(&vdp->xdf_vreq_act); 2511 buf_t *bp = vreq->v_buf; 2512 2513 bp->av_back = NULL; 2514 bp->b_resid = bp->b_bcount; 2515 if (vdp->xdf_f_act == NULL) { 2516 vdp->xdf_f_act = vdp->xdf_l_act = bp; 2517 } else { 2518 /* move to the head of list */ 2519 bp->av_forw = vdp->xdf_f_act; 2520 vdp->xdf_f_act = bp; 2521 } 2522 kstat_runq_back_to_waitq(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 2523 vreq_free(vdp, vreq); 2524 } 2525 } 2526 2527 static void 2528 xdfmin(struct buf *bp) 2529 { 2530 if (bp->b_bcount > xdf_maxphys) 2531 bp->b_bcount = xdf_maxphys; 2532 } 2533