ld_virtio.c revision 1.11
1 /* $NetBSD: ld_virtio.c,v 1.11 2016/09/16 15:20:50 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 2010 Minoura Makoto. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: ld_virtio.c,v 1.11 2016/09/16 15:20:50 jdolecek Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/buf.h> 35 #include <sys/bufq.h> 36 #include <sys/bus.h> 37 #include <sys/device.h> 38 #include <sys/disk.h> 39 #include <sys/mutex.h> 40 41 #include <dev/pci/pcidevs.h> 42 #include <dev/pci/pcireg.h> 43 #include <dev/pci/pcivar.h> 44 45 #include <dev/ldvar.h> 46 #include <dev/pci/virtioreg.h> 47 #include <dev/pci/virtiovar.h> 48 49 /* 50 * ld_virtioreg: 51 */ 52 /* Configuration registers */ 53 #define VIRTIO_BLK_CONFIG_CAPACITY 0 /* 64bit */ 54 #define VIRTIO_BLK_CONFIG_SIZE_MAX 8 /* 32bit */ 55 #define VIRTIO_BLK_CONFIG_SEG_MAX 12 /* 32bit */ 56 #define VIRTIO_BLK_CONFIG_GEOMETRY_C 16 /* 16bit */ 57 #define VIRTIO_BLK_CONFIG_GEOMETRY_H 18 /* 8bit */ 58 #define VIRTIO_BLK_CONFIG_GEOMETRY_S 19 /* 8bit */ 59 #define VIRTIO_BLK_CONFIG_BLK_SIZE 20 /* 32bit */ 60 61 /* Feature bits */ 62 #define VIRTIO_BLK_F_BARRIER (1<<0) 63 #define VIRTIO_BLK_F_SIZE_MAX (1<<1) 64 #define VIRTIO_BLK_F_SEG_MAX (1<<2) 65 #define VIRTIO_BLK_F_GEOMETRY (1<<4) 66 #define VIRTIO_BLK_F_RO (1<<5) 67 #define VIRTIO_BLK_F_BLK_SIZE (1<<6) 68 #define VIRTIO_BLK_F_SCSI (1<<7) 69 #define VIRTIO_BLK_F_FLUSH (1<<9) 70 71 /* 72 * Each block request uses at least two segments - one for the header 73 * and one for the status. 74 */ 75 #define VIRTIO_BLK_MIN_SEGMENTS 2 76 77 #define VIRTIO_BLK_FLAG_BITS \ 78 VIRTIO_COMMON_FLAG_BITS \ 79 "\x0a""FLUSH" \ 80 "\x08""SCSI" \ 81 "\x07""BLK_SIZE" \ 82 "\x06""RO" \ 83 "\x05""GEOMETRY" \ 84 "\x03""SEG_MAX" \ 85 "\x02""SIZE_MAX" \ 86 "\x01""BARRIER" 87 88 /* Command */ 89 #define VIRTIO_BLK_T_IN 0 90 #define VIRTIO_BLK_T_OUT 1 91 #define VIRTIO_BLK_T_BARRIER 0x80000000 92 93 /* Status */ 94 #define VIRTIO_BLK_S_OK 0 95 #define VIRTIO_BLK_S_IOERR 1 96 97 /* Request header structure */ 98 struct virtio_blk_req_hdr { 99 uint32_t type; /* VIRTIO_BLK_T_* */ 100 uint32_t ioprio; 101 uint64_t sector; 102 } __packed; 103 /* 512*virtio_blk_req_hdr.sector byte payload and 1 byte status follows */ 104 105 106 /* 107 * ld_virtiovar: 108 */ 109 struct virtio_blk_req { 110 struct virtio_blk_req_hdr vr_hdr; 111 uint8_t vr_status; 112 struct buf *vr_bp; 113 bus_dmamap_t vr_cmdsts; 114 bus_dmamap_t vr_payload; 115 }; 116 117 struct ld_virtio_softc { 118 struct ld_softc sc_ld; 119 device_t sc_dev; 120 121 struct virtio_softc *sc_virtio; 122 struct virtqueue sc_vq; 123 124 struct virtio_blk_req *sc_reqs; 125 bus_dma_segment_t sc_reqs_seg; 126 127 int sc_readonly; 128 }; 129 130 static int ld_virtio_match(device_t, cfdata_t, void *); 131 static void ld_virtio_attach(device_t, device_t, void *); 132 static int ld_virtio_detach(device_t, int); 133 134 CFATTACH_DECL_NEW(ld_virtio, sizeof(struct ld_virtio_softc), 135 ld_virtio_match, ld_virtio_attach, ld_virtio_detach, NULL); 136 137 static int 138 ld_virtio_match(device_t parent, cfdata_t match, void *aux) 139 { 140 struct virtio_softc *va = aux; 141 142 if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_BLOCK) 143 return 1; 144 145 return 0; 146 } 147 148 static int ld_virtio_vq_done(struct virtqueue *); 149 static int ld_virtio_dump(struct ld_softc *, void *, int, int); 150 static int ld_virtio_start(struct ld_softc *, struct buf *); 151 152 static int 153 ld_virtio_alloc_reqs(struct ld_virtio_softc *sc, int qsize) 154 { 155 int allocsize, r, rsegs, i; 156 struct ld_softc *ld = &sc->sc_ld; 157 void *vaddr; 158 159 allocsize = sizeof(struct virtio_blk_req) * qsize; 160 r = bus_dmamem_alloc(sc->sc_virtio->sc_dmat, allocsize, 0, 0, 161 &sc->sc_reqs_seg, 1, &rsegs, BUS_DMA_NOWAIT); 162 if (r != 0) { 163 aprint_error_dev(sc->sc_dev, 164 "DMA memory allocation failed, size %d, " 165 "error code %d\n", allocsize, r); 166 goto err_none; 167 } 168 r = bus_dmamem_map(sc->sc_virtio->sc_dmat, 169 &sc->sc_reqs_seg, 1, allocsize, 170 &vaddr, BUS_DMA_NOWAIT); 171 if (r != 0) { 172 aprint_error_dev(sc->sc_dev, 173 "DMA memory map failed, " 174 "error code %d\n", r); 175 goto err_dmamem_alloc; 176 } 177 sc->sc_reqs = vaddr; 178 memset(vaddr, 0, allocsize); 179 for (i = 0; i < qsize; i++) { 180 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 181 r = bus_dmamap_create(sc->sc_virtio->sc_dmat, 182 offsetof(struct virtio_blk_req, vr_bp), 183 1, 184 offsetof(struct virtio_blk_req, vr_bp), 185 0, 186 BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, 187 &vr->vr_cmdsts); 188 if (r != 0) { 189 aprint_error_dev(sc->sc_dev, 190 "command dmamap creation failed, " 191 "error code %d\n", r); 192 goto err_reqs; 193 } 194 r = bus_dmamap_load(sc->sc_virtio->sc_dmat, vr->vr_cmdsts, 195 &vr->vr_hdr, 196 offsetof(struct virtio_blk_req, vr_bp), 197 NULL, BUS_DMA_NOWAIT); 198 if (r != 0) { 199 aprint_error_dev(sc->sc_dev, 200 "command dmamap load failed, " 201 "error code %d\n", r); 202 goto err_reqs; 203 } 204 r = bus_dmamap_create(sc->sc_virtio->sc_dmat, 205 ld->sc_maxxfer, 206 (ld->sc_maxxfer / NBPG) + 207 VIRTIO_BLK_MIN_SEGMENTS, 208 ld->sc_maxxfer, 209 0, 210 BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, 211 &vr->vr_payload); 212 if (r != 0) { 213 aprint_error_dev(sc->sc_dev, 214 "payload dmamap creation failed, " 215 "error code %d\n", r); 216 goto err_reqs; 217 } 218 } 219 return 0; 220 221 err_reqs: 222 for (i = 0; i < qsize; i++) { 223 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 224 if (vr->vr_cmdsts) { 225 bus_dmamap_destroy(sc->sc_virtio->sc_dmat, 226 vr->vr_cmdsts); 227 vr->vr_cmdsts = 0; 228 } 229 if (vr->vr_payload) { 230 bus_dmamap_destroy(sc->sc_virtio->sc_dmat, 231 vr->vr_payload); 232 vr->vr_payload = 0; 233 } 234 } 235 bus_dmamem_unmap(sc->sc_virtio->sc_dmat, sc->sc_reqs, allocsize); 236 err_dmamem_alloc: 237 bus_dmamem_free(sc->sc_virtio->sc_dmat, &sc->sc_reqs_seg, 1); 238 err_none: 239 return -1; 240 } 241 242 static void 243 ld_virtio_attach(device_t parent, device_t self, void *aux) 244 { 245 struct ld_virtio_softc *sc = device_private(self); 246 struct ld_softc *ld = &sc->sc_ld; 247 struct virtio_softc *vsc = device_private(parent); 248 uint32_t features; 249 char buf[256]; 250 int qsize, maxxfersize, maxnsegs; 251 252 if (vsc->sc_child != NULL) { 253 aprint_normal(": child already attached for %s; " 254 "something wrong...\n", device_xname(parent)); 255 return; 256 } 257 258 sc->sc_dev = self; 259 sc->sc_virtio = vsc; 260 261 vsc->sc_child = self; 262 vsc->sc_ipl = IPL_BIO; 263 vsc->sc_vqs = &sc->sc_vq; 264 vsc->sc_nvqs = 1; 265 vsc->sc_config_change = NULL; 266 vsc->sc_intrhand = virtio_vq_intr; 267 vsc->sc_flags = 0; 268 269 features = virtio_negotiate_features(vsc, 270 (VIRTIO_BLK_F_SIZE_MAX | 271 VIRTIO_BLK_F_SEG_MAX | 272 VIRTIO_BLK_F_GEOMETRY | 273 VIRTIO_BLK_F_RO | 274 VIRTIO_BLK_F_BLK_SIZE)); 275 if (features & VIRTIO_BLK_F_RO) 276 sc->sc_readonly = 1; 277 else 278 sc->sc_readonly = 0; 279 280 snprintb(buf, sizeof(buf), VIRTIO_BLK_FLAG_BITS, features); 281 aprint_normal(": Features: %s\n", buf); 282 aprint_naive("\n"); 283 if (features & VIRTIO_BLK_F_BLK_SIZE) { 284 ld->sc_secsize = virtio_read_device_config_4(vsc, 285 VIRTIO_BLK_CONFIG_BLK_SIZE); 286 } else 287 ld->sc_secsize = 512; 288 289 /* At least genfs_io assumes maxxfer == MAXPHYS. */ 290 if (features & VIRTIO_BLK_F_SIZE_MAX) { 291 maxxfersize = virtio_read_device_config_4(vsc, 292 VIRTIO_BLK_CONFIG_SIZE_MAX); 293 if (maxxfersize < MAXPHYS) { 294 aprint_error_dev(sc->sc_dev, 295 "Too small SIZE_MAX %dK minimum is %dK\n", 296 maxxfersize / 1024, MAXPHYS / 1024); 297 // goto err; 298 maxxfersize = MAXPHYS; 299 } else if (maxxfersize > MAXPHYS) { 300 aprint_normal_dev(sc->sc_dev, 301 "Clip SEG_MAX from %dK to %dK\n", 302 maxxfersize / 1024, 303 MAXPHYS / 1024); 304 maxxfersize = MAXPHYS; 305 } 306 } else 307 maxxfersize = MAXPHYS; 308 309 if (features & VIRTIO_BLK_F_SEG_MAX) { 310 maxnsegs = virtio_read_device_config_4(vsc, 311 VIRTIO_BLK_CONFIG_SEG_MAX); 312 if (maxnsegs < VIRTIO_BLK_MIN_SEGMENTS) { 313 aprint_error_dev(sc->sc_dev, 314 "Too small SEG_MAX %d minimum is %d\n", 315 maxnsegs, VIRTIO_BLK_MIN_SEGMENTS); 316 maxnsegs = maxxfersize / NBPG; 317 // goto err; 318 } 319 } else 320 maxnsegs = maxxfersize / NBPG; 321 322 /* 2 for the minimum size */ 323 maxnsegs += VIRTIO_BLK_MIN_SEGMENTS; 324 325 if (virtio_alloc_vq(vsc, &sc->sc_vq, 0, maxxfersize, maxnsegs, 326 "I/O request") != 0) { 327 goto err; 328 } 329 qsize = sc->sc_vq.vq_num; 330 sc->sc_vq.vq_done = ld_virtio_vq_done; 331 332 ld->sc_dv = self; 333 ld->sc_secperunit = virtio_read_device_config_8(vsc, 334 VIRTIO_BLK_CONFIG_CAPACITY); 335 ld->sc_maxxfer = maxxfersize; 336 if (features & VIRTIO_BLK_F_GEOMETRY) { 337 ld->sc_ncylinders = virtio_read_device_config_2(vsc, 338 VIRTIO_BLK_CONFIG_GEOMETRY_C); 339 ld->sc_nheads = virtio_read_device_config_1(vsc, 340 VIRTIO_BLK_CONFIG_GEOMETRY_H); 341 ld->sc_nsectors = virtio_read_device_config_1(vsc, 342 VIRTIO_BLK_CONFIG_GEOMETRY_S); 343 } 344 ld->sc_maxqueuecnt = qsize; 345 346 if (ld_virtio_alloc_reqs(sc, qsize) < 0) 347 goto err; 348 349 ld->sc_dump = ld_virtio_dump; 350 ld->sc_flush = NULL; 351 ld->sc_start = ld_virtio_start; 352 353 ld->sc_flags = LDF_ENABLED; 354 ldattach(ld, BUFQ_DISK_DEFAULT_STRAT); 355 356 return; 357 358 err: 359 vsc->sc_child = (void*)1; 360 return; 361 } 362 363 static int 364 ld_virtio_start(struct ld_softc *ld, struct buf *bp) 365 { 366 /* splbio */ 367 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 368 struct virtio_softc *vsc = sc->sc_virtio; 369 struct virtqueue *vq = &sc->sc_vq; 370 struct virtio_blk_req *vr; 371 int r; 372 int isread = (bp->b_flags & B_READ); 373 int slot; 374 375 if (sc->sc_readonly && !isread) 376 return EIO; 377 378 r = virtio_enqueue_prep(vsc, vq, &slot); 379 if (r != 0) 380 return r; 381 382 vr = &sc->sc_reqs[slot]; 383 KASSERT(vr->vr_bp == NULL); 384 385 r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload, 386 bp->b_data, bp->b_bcount, NULL, 387 ((isread?BUS_DMA_READ:BUS_DMA_WRITE) 388 |BUS_DMA_NOWAIT)); 389 if (r != 0) { 390 aprint_error_dev(sc->sc_dev, 391 "payload dmamap failed, error code %d\n", r); 392 virtio_enqueue_abort(vsc, vq, slot); 393 return r; 394 } 395 396 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 397 VIRTIO_BLK_MIN_SEGMENTS); 398 if (r != 0) { 399 virtio_enqueue_abort(vsc, vq, slot); 400 bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); 401 return r; 402 } 403 404 vr->vr_bp = bp; 405 vr->vr_hdr.type = isread?VIRTIO_BLK_T_IN:VIRTIO_BLK_T_OUT; 406 vr->vr_hdr.ioprio = 0; 407 vr->vr_hdr.sector = bp->b_rawblkno * sc->sc_ld.sc_secsize / 512; 408 409 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 410 0, sizeof(struct virtio_blk_req_hdr), 411 BUS_DMASYNC_PREWRITE); 412 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 413 0, bp->b_bcount, 414 isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE); 415 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 416 offsetof(struct virtio_blk_req, vr_status), 417 sizeof(uint8_t), 418 BUS_DMASYNC_PREREAD); 419 420 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 421 0, sizeof(struct virtio_blk_req_hdr), 422 true); 423 virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread); 424 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 425 offsetof(struct virtio_blk_req, vr_status), 426 sizeof(uint8_t), 427 false); 428 virtio_enqueue_commit(vsc, vq, slot, true); 429 430 return 0; 431 } 432 433 static void 434 ld_virtio_vq_done1(struct ld_virtio_softc *sc, struct virtio_softc *vsc, 435 struct virtqueue *vq, int slot) 436 { 437 struct virtio_blk_req *vr = &sc->sc_reqs[slot]; 438 struct buf *bp = vr->vr_bp; 439 440 vr->vr_bp = NULL; 441 442 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 443 0, sizeof(struct virtio_blk_req_hdr), 444 BUS_DMASYNC_POSTWRITE); 445 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 446 0, bp->b_bcount, 447 (bp->b_flags & B_READ)?BUS_DMASYNC_POSTREAD 448 :BUS_DMASYNC_POSTWRITE); 449 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 450 sizeof(struct virtio_blk_req_hdr), sizeof(uint8_t), 451 BUS_DMASYNC_POSTREAD); 452 453 if (vr->vr_status != VIRTIO_BLK_S_OK) { 454 bp->b_error = EIO; 455 bp->b_resid = bp->b_bcount; 456 } else { 457 bp->b_error = 0; 458 bp->b_resid = 0; 459 } 460 461 virtio_dequeue_commit(vsc, vq, slot); 462 463 lddone(&sc->sc_ld, bp); 464 } 465 466 static int 467 ld_virtio_vq_done(struct virtqueue *vq) 468 { 469 struct virtio_softc *vsc = vq->vq_owner; 470 struct ld_virtio_softc *sc = device_private(vsc->sc_child); 471 int r = 0; 472 int slot; 473 474 again: 475 if (virtio_dequeue(vsc, vq, &slot, NULL)) 476 return r; 477 r = 1; 478 479 ld_virtio_vq_done1(sc, vsc, vq, slot); 480 goto again; 481 } 482 483 static int 484 ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 485 { 486 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 487 struct virtio_softc *vsc = sc->sc_virtio; 488 struct virtqueue *vq = &sc->sc_vq; 489 struct virtio_blk_req *vr; 490 int slot, r; 491 492 if (sc->sc_readonly) 493 return EIO; 494 495 r = virtio_enqueue_prep(vsc, vq, &slot); 496 if (r != 0) { 497 if (r == EAGAIN) { /* no free slot; dequeue first */ 498 delay(100); 499 ld_virtio_vq_done(vq); 500 r = virtio_enqueue_prep(vsc, vq, &slot); 501 if (r != 0) 502 return r; 503 } 504 return r; 505 } 506 vr = &sc->sc_reqs[slot]; 507 r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload, 508 data, blkcnt*ld->sc_secsize, NULL, 509 BUS_DMA_WRITE|BUS_DMA_NOWAIT); 510 if (r != 0) 511 return r; 512 513 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 514 VIRTIO_BLK_MIN_SEGMENTS); 515 if (r != 0) { 516 bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); 517 return r; 518 } 519 520 vr->vr_bp = (void*)0xdeadbeef; 521 vr->vr_hdr.type = VIRTIO_BLK_T_OUT; 522 vr->vr_hdr.ioprio = 0; 523 vr->vr_hdr.sector = (daddr_t) blkno * ld->sc_secsize / 512; 524 525 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 526 0, sizeof(struct virtio_blk_req_hdr), 527 BUS_DMASYNC_PREWRITE); 528 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 529 0, blkcnt*ld->sc_secsize, 530 BUS_DMASYNC_PREWRITE); 531 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 532 offsetof(struct virtio_blk_req, vr_status), 533 sizeof(uint8_t), 534 BUS_DMASYNC_PREREAD); 535 536 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 537 0, sizeof(struct virtio_blk_req_hdr), 538 true); 539 virtio_enqueue(vsc, vq, slot, vr->vr_payload, true); 540 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 541 offsetof(struct virtio_blk_req, vr_status), 542 sizeof(uint8_t), 543 false); 544 virtio_enqueue_commit(vsc, vq, slot, true); 545 546 for ( ; ; ) { 547 int dslot; 548 549 r = virtio_dequeue(vsc, vq, &dslot, NULL); 550 if (r != 0) 551 continue; 552 if (dslot != slot) { 553 ld_virtio_vq_done1(sc, vsc, vq, dslot); 554 continue; 555 } else 556 break; 557 } 558 559 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 560 0, sizeof(struct virtio_blk_req_hdr), 561 BUS_DMASYNC_POSTWRITE); 562 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 563 0, blkcnt*ld->sc_secsize, 564 BUS_DMASYNC_POSTWRITE); 565 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 566 offsetof(struct virtio_blk_req, vr_status), 567 sizeof(uint8_t), 568 BUS_DMASYNC_POSTREAD); 569 if (vr->vr_status == VIRTIO_BLK_S_OK) 570 r = 0; 571 else 572 r = EIO; 573 virtio_dequeue_commit(vsc, vq, slot); 574 575 return r; 576 } 577 578 static int 579 ld_virtio_detach(device_t self, int flags) 580 { 581 struct ld_virtio_softc *sc = device_private(self); 582 struct ld_softc *ld = &sc->sc_ld; 583 bus_dma_tag_t dmat = sc->sc_virtio->sc_dmat; 584 int r, i, qsize; 585 586 qsize = sc->sc_vq.vq_num; 587 r = ldbegindetach(ld, flags); 588 if (r != 0) 589 return r; 590 virtio_reset(sc->sc_virtio); 591 virtio_free_vq(sc->sc_virtio, &sc->sc_vq); 592 593 for (i = 0; i < qsize; i++) { 594 bus_dmamap_destroy(dmat, 595 sc->sc_reqs[i].vr_cmdsts); 596 bus_dmamap_destroy(dmat, 597 sc->sc_reqs[i].vr_payload); 598 } 599 bus_dmamem_unmap(dmat, sc->sc_reqs, 600 sizeof(struct virtio_blk_req) * qsize); 601 bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1); 602 603 ldenddetach(ld); 604 605 return 0; 606 } 607
Indexes created Sun Sep 28 07:09:56 GMT 2025