ld_virtio.c revision 1.13
1 /* $NetBSD: ld_virtio.c,v 1.13 2016/11/30 01:36:38 christos 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 1.13 2016/11/30 01:36:38 christos 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 #include <sys/module.h> 41 42 #include <dev/pci/pcidevs.h> 43 #include <dev/pci/pcireg.h> 44 #include <dev/pci/pcivar.h> 45 46 #include <dev/ldvar.h> 47 #include <dev/pci/virtioreg.h> 48 #include <dev/pci/virtiovar.h> 49 50 #include "ioconf.h" 51 52 /* 53 * ld_virtioreg: 54 */ 55 /* Configuration registers */ 56 #define VIRTIO_BLK_CONFIG_CAPACITY 0 /* 64bit */ 57 #define VIRTIO_BLK_CONFIG_SIZE_MAX 8 /* 32bit */ 58 #define VIRTIO_BLK_CONFIG_SEG_MAX 12 /* 32bit */ 59 #define VIRTIO_BLK_CONFIG_GEOMETRY_C 16 /* 16bit */ 60 #define VIRTIO_BLK_CONFIG_GEOMETRY_H 18 /* 8bit */ 61 #define VIRTIO_BLK_CONFIG_GEOMETRY_S 19 /* 8bit */ 62 #define VIRTIO_BLK_CONFIG_BLK_SIZE 20 /* 32bit */ 63 64 /* Feature bits */ 65 #define VIRTIO_BLK_F_BARRIER (1<<0) 66 #define VIRTIO_BLK_F_SIZE_MAX (1<<1) 67 #define VIRTIO_BLK_F_SEG_MAX (1<<2) 68 #define VIRTIO_BLK_F_GEOMETRY (1<<4) 69 #define VIRTIO_BLK_F_RO (1<<5) 70 #define VIRTIO_BLK_F_BLK_SIZE (1<<6) 71 #define VIRTIO_BLK_F_SCSI (1<<7) 72 #define VIRTIO_BLK_F_FLUSH (1<<9) 73 74 /* 75 * Each block request uses at least two segments - one for the header 76 * and one for the status. 77 */ 78 #define VIRTIO_BLK_MIN_SEGMENTS 2 79 80 #define VIRTIO_BLK_FLAG_BITS \ 81 VIRTIO_COMMON_FLAG_BITS \ 82 "\x0a""FLUSH" \ 83 "\x08""SCSI" \ 84 "\x07""BLK_SIZE" \ 85 "\x06""RO" \ 86 "\x05""GEOMETRY" \ 87 "\x03""SEG_MAX" \ 88 "\x02""SIZE_MAX" \ 89 "\x01""BARRIER" 90 91 /* Command */ 92 #define VIRTIO_BLK_T_IN 0 93 #define VIRTIO_BLK_T_OUT 1 94 #define VIRTIO_BLK_T_BARRIER 0x80000000 95 96 /* Status */ 97 #define VIRTIO_BLK_S_OK 0 98 #define VIRTIO_BLK_S_IOERR 1 99 100 /* Request header structure */ 101 struct virtio_blk_req_hdr { 102 uint32_t type; /* VIRTIO_BLK_T_* */ 103 uint32_t ioprio; 104 uint64_t sector; 105 } __packed; 106 /* 512*virtio_blk_req_hdr.sector byte payload and 1 byte status follows */ 107 108 109 /* 110 * ld_virtiovar: 111 */ 112 struct virtio_blk_req { 113 struct virtio_blk_req_hdr vr_hdr; 114 uint8_t vr_status; 115 struct buf *vr_bp; 116 bus_dmamap_t vr_cmdsts; 117 bus_dmamap_t vr_payload; 118 }; 119 120 struct ld_virtio_softc { 121 struct ld_softc sc_ld; 122 device_t sc_dev; 123 124 struct virtio_softc *sc_virtio; 125 struct virtqueue sc_vq; 126 127 struct virtio_blk_req *sc_reqs; 128 bus_dma_segment_t sc_reqs_seg; 129 130 int sc_readonly; 131 }; 132 133 static int ld_virtio_match(device_t, cfdata_t, void *); 134 static void ld_virtio_attach(device_t, device_t, void *); 135 static int ld_virtio_detach(device_t, int); 136 137 CFATTACH_DECL_NEW(ld_virtio, sizeof(struct ld_virtio_softc), 138 ld_virtio_match, ld_virtio_attach, ld_virtio_detach, NULL); 139 140 static int 141 ld_virtio_match(device_t parent, cfdata_t match, void *aux) 142 { 143 struct virtio_softc *va = aux; 144 145 if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_BLOCK) 146 return 1; 147 148 return 0; 149 } 150 151 static int ld_virtio_vq_done(struct virtqueue *); 152 static int ld_virtio_dump(struct ld_softc *, void *, int, int); 153 static int ld_virtio_start(struct ld_softc *, struct buf *); 154 155 static int 156 ld_virtio_alloc_reqs(struct ld_virtio_softc *sc, int qsize) 157 { 158 int allocsize, r, rsegs, i; 159 struct ld_softc *ld = &sc->sc_ld; 160 void *vaddr; 161 162 allocsize = sizeof(struct virtio_blk_req) * qsize; 163 r = bus_dmamem_alloc(sc->sc_virtio->sc_dmat, allocsize, 0, 0, 164 &sc->sc_reqs_seg, 1, &rsegs, BUS_DMA_NOWAIT); 165 if (r != 0) { 166 aprint_error_dev(sc->sc_dev, 167 "DMA memory allocation failed, size %d, " 168 "error code %d\n", allocsize, r); 169 goto err_none; 170 } 171 r = bus_dmamem_map(sc->sc_virtio->sc_dmat, 172 &sc->sc_reqs_seg, 1, allocsize, 173 &vaddr, BUS_DMA_NOWAIT); 174 if (r != 0) { 175 aprint_error_dev(sc->sc_dev, 176 "DMA memory map failed, " 177 "error code %d\n", r); 178 goto err_dmamem_alloc; 179 } 180 sc->sc_reqs = vaddr; 181 memset(vaddr, 0, allocsize); 182 for (i = 0; i < qsize; i++) { 183 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 184 r = bus_dmamap_create(sc->sc_virtio->sc_dmat, 185 offsetof(struct virtio_blk_req, vr_bp), 186 1, 187 offsetof(struct virtio_blk_req, vr_bp), 188 0, 189 BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, 190 &vr->vr_cmdsts); 191 if (r != 0) { 192 aprint_error_dev(sc->sc_dev, 193 "command dmamap creation failed, " 194 "error code %d\n", r); 195 goto err_reqs; 196 } 197 r = bus_dmamap_load(sc->sc_virtio->sc_dmat, vr->vr_cmdsts, 198 &vr->vr_hdr, 199 offsetof(struct virtio_blk_req, vr_bp), 200 NULL, BUS_DMA_NOWAIT); 201 if (r != 0) { 202 aprint_error_dev(sc->sc_dev, 203 "command dmamap load failed, " 204 "error code %d\n", r); 205 goto err_reqs; 206 } 207 r = bus_dmamap_create(sc->sc_virtio->sc_dmat, 208 ld->sc_maxxfer, 209 (ld->sc_maxxfer / NBPG) + 210 VIRTIO_BLK_MIN_SEGMENTS, 211 ld->sc_maxxfer, 212 0, 213 BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, 214 &vr->vr_payload); 215 if (r != 0) { 216 aprint_error_dev(sc->sc_dev, 217 "payload dmamap creation failed, " 218 "error code %d\n", r); 219 goto err_reqs; 220 } 221 } 222 return 0; 223 224 err_reqs: 225 for (i = 0; i < qsize; i++) { 226 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 227 if (vr->vr_cmdsts) { 228 bus_dmamap_destroy(sc->sc_virtio->sc_dmat, 229 vr->vr_cmdsts); 230 vr->vr_cmdsts = 0; 231 } 232 if (vr->vr_payload) { 233 bus_dmamap_destroy(sc->sc_virtio->sc_dmat, 234 vr->vr_payload); 235 vr->vr_payload = 0; 236 } 237 } 238 bus_dmamem_unmap(sc->sc_virtio->sc_dmat, sc->sc_reqs, allocsize); 239 err_dmamem_alloc: 240 bus_dmamem_free(sc->sc_virtio->sc_dmat, &sc->sc_reqs_seg, 1); 241 err_none: 242 return -1; 243 } 244 245 static void 246 ld_virtio_attach(device_t parent, device_t self, void *aux) 247 { 248 struct ld_virtio_softc *sc = device_private(self); 249 struct ld_softc *ld = &sc->sc_ld; 250 struct virtio_softc *vsc = device_private(parent); 251 uint32_t features; 252 char buf[256]; 253 int qsize, maxxfersize, maxnsegs; 254 255 if (vsc->sc_child != NULL) { 256 aprint_normal(": child already attached for %s; " 257 "something wrong...\n", device_xname(parent)); 258 return; 259 } 260 261 sc->sc_dev = self; 262 sc->sc_virtio = vsc; 263 264 vsc->sc_child = self; 265 vsc->sc_ipl = IPL_BIO; 266 vsc->sc_vqs = &sc->sc_vq; 267 vsc->sc_nvqs = 1; 268 vsc->sc_config_change = NULL; 269 vsc->sc_intrhand = virtio_vq_intr; 270 vsc->sc_flags = 0; 271 272 features = virtio_negotiate_features(vsc, 273 (VIRTIO_BLK_F_SIZE_MAX | 274 VIRTIO_BLK_F_SEG_MAX | 275 VIRTIO_BLK_F_GEOMETRY | 276 VIRTIO_BLK_F_RO | 277 VIRTIO_BLK_F_BLK_SIZE)); 278 if (features & VIRTIO_BLK_F_RO) 279 sc->sc_readonly = 1; 280 else 281 sc->sc_readonly = 0; 282 283 snprintb(buf, sizeof(buf), VIRTIO_BLK_FLAG_BITS, features); 284 aprint_normal(": Features: %s\n", buf); 285 aprint_naive("\n"); 286 if (features & VIRTIO_BLK_F_BLK_SIZE) { 287 ld->sc_secsize = virtio_read_device_config_4(vsc, 288 VIRTIO_BLK_CONFIG_BLK_SIZE); 289 } else 290 ld->sc_secsize = 512; 291 292 /* At least genfs_io assumes maxxfer == MAXPHYS. */ 293 if (features & VIRTIO_BLK_F_SIZE_MAX) { 294 maxxfersize = virtio_read_device_config_4(vsc, 295 VIRTIO_BLK_CONFIG_SIZE_MAX); 296 if (maxxfersize < MAXPHYS) { 297 aprint_error_dev(sc->sc_dev, 298 "Too small SIZE_MAX %dK minimum is %dK\n", 299 maxxfersize / 1024, MAXPHYS / 1024); 300 // goto err; 301 maxxfersize = MAXPHYS; 302 } else if (maxxfersize > MAXPHYS) { 303 aprint_normal_dev(sc->sc_dev, 304 "Clip SEG_MAX from %dK to %dK\n", 305 maxxfersize / 1024, 306 MAXPHYS / 1024); 307 maxxfersize = MAXPHYS; 308 } 309 } else 310 maxxfersize = MAXPHYS; 311 312 if (features & VIRTIO_BLK_F_SEG_MAX) { 313 maxnsegs = virtio_read_device_config_4(vsc, 314 VIRTIO_BLK_CONFIG_SEG_MAX); 315 if (maxnsegs < VIRTIO_BLK_MIN_SEGMENTS) { 316 aprint_error_dev(sc->sc_dev, 317 "Too small SEG_MAX %d minimum is %d\n", 318 maxnsegs, VIRTIO_BLK_MIN_SEGMENTS); 319 maxnsegs = maxxfersize / NBPG; 320 // goto err; 321 } 322 } else 323 maxnsegs = maxxfersize / NBPG; 324 325 /* 2 for the minimum size */ 326 maxnsegs += VIRTIO_BLK_MIN_SEGMENTS; 327 328 if (virtio_alloc_vq(vsc, &sc->sc_vq, 0, maxxfersize, maxnsegs, 329 "I/O request") != 0) { 330 goto err; 331 } 332 qsize = sc->sc_vq.vq_num; 333 sc->sc_vq.vq_done = ld_virtio_vq_done; 334 335 ld->sc_dv = self; 336 ld->sc_secperunit = virtio_read_device_config_8(vsc, 337 VIRTIO_BLK_CONFIG_CAPACITY); 338 ld->sc_maxxfer = maxxfersize; 339 if (features & VIRTIO_BLK_F_GEOMETRY) { 340 ld->sc_ncylinders = virtio_read_device_config_2(vsc, 341 VIRTIO_BLK_CONFIG_GEOMETRY_C); 342 ld->sc_nheads = virtio_read_device_config_1(vsc, 343 VIRTIO_BLK_CONFIG_GEOMETRY_H); 344 ld->sc_nsectors = virtio_read_device_config_1(vsc, 345 VIRTIO_BLK_CONFIG_GEOMETRY_S); 346 } 347 ld->sc_maxqueuecnt = qsize; 348 349 if (ld_virtio_alloc_reqs(sc, qsize) < 0) 350 goto err; 351 352 ld->sc_dump = ld_virtio_dump; 353 ld->sc_flush = NULL; 354 ld->sc_start = ld_virtio_start; 355 356 ld->sc_flags = LDF_ENABLED; 357 ldattach(ld, BUFQ_DISK_DEFAULT_STRAT); 358 359 return; 360 361 err: 362 vsc->sc_child = (void*)1; 363 return; 364 } 365 366 static int 367 ld_virtio_start(struct ld_softc *ld, struct buf *bp) 368 { 369 /* splbio */ 370 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 371 struct virtio_softc *vsc = sc->sc_virtio; 372 struct virtqueue *vq = &sc->sc_vq; 373 struct virtio_blk_req *vr; 374 int r; 375 int isread = (bp->b_flags & B_READ); 376 int slot; 377 378 if (sc->sc_readonly && !isread) 379 return EIO; 380 381 r = virtio_enqueue_prep(vsc, vq, &slot); 382 if (r != 0) 383 return r; 384 385 vr = &sc->sc_reqs[slot]; 386 KASSERT(vr->vr_bp == NULL); 387 388 r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload, 389 bp->b_data, bp->b_bcount, NULL, 390 ((isread?BUS_DMA_READ:BUS_DMA_WRITE) 391 |BUS_DMA_NOWAIT)); 392 if (r != 0) { 393 aprint_error_dev(sc->sc_dev, 394 "payload dmamap failed, error code %d\n", r); 395 virtio_enqueue_abort(vsc, vq, slot); 396 return r; 397 } 398 399 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 400 VIRTIO_BLK_MIN_SEGMENTS); 401 if (r != 0) { 402 bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); 403 return r; 404 } 405 406 vr->vr_bp = bp; 407 vr->vr_hdr.type = isread?VIRTIO_BLK_T_IN:VIRTIO_BLK_T_OUT; 408 vr->vr_hdr.ioprio = 0; 409 vr->vr_hdr.sector = bp->b_rawblkno * sc->sc_ld.sc_secsize / 512; 410 411 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 412 0, sizeof(struct virtio_blk_req_hdr), 413 BUS_DMASYNC_PREWRITE); 414 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 415 0, bp->b_bcount, 416 isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE); 417 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 418 offsetof(struct virtio_blk_req, vr_status), 419 sizeof(uint8_t), 420 BUS_DMASYNC_PREREAD); 421 422 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 423 0, sizeof(struct virtio_blk_req_hdr), 424 true); 425 virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread); 426 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 427 offsetof(struct virtio_blk_req, vr_status), 428 sizeof(uint8_t), 429 false); 430 virtio_enqueue_commit(vsc, vq, slot, true); 431 432 return 0; 433 } 434 435 static void 436 ld_virtio_vq_done1(struct ld_virtio_softc *sc, struct virtio_softc *vsc, 437 struct virtqueue *vq, int slot) 438 { 439 struct virtio_blk_req *vr = &sc->sc_reqs[slot]; 440 struct buf *bp = vr->vr_bp; 441 442 vr->vr_bp = NULL; 443 444 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 445 0, sizeof(struct virtio_blk_req_hdr), 446 BUS_DMASYNC_POSTWRITE); 447 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 448 0, bp->b_bcount, 449 (bp->b_flags & B_READ)?BUS_DMASYNC_POSTREAD 450 :BUS_DMASYNC_POSTWRITE); 451 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 452 sizeof(struct virtio_blk_req_hdr), sizeof(uint8_t), 453 BUS_DMASYNC_POSTREAD); 454 455 if (vr->vr_status != VIRTIO_BLK_S_OK) { 456 bp->b_error = EIO; 457 bp->b_resid = bp->b_bcount; 458 } else { 459 bp->b_error = 0; 460 bp->b_resid = 0; 461 } 462 463 virtio_dequeue_commit(vsc, vq, slot); 464 465 lddone(&sc->sc_ld, bp); 466 } 467 468 static int 469 ld_virtio_vq_done(struct virtqueue *vq) 470 { 471 struct virtio_softc *vsc = vq->vq_owner; 472 struct ld_virtio_softc *sc = device_private(vsc->sc_child); 473 int r = 0; 474 int slot; 475 476 again: 477 if (virtio_dequeue(vsc, vq, &slot, NULL)) 478 return r; 479 r = 1; 480 481 ld_virtio_vq_done1(sc, vsc, vq, slot); 482 goto again; 483 } 484 485 static int 486 ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 487 { 488 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 489 struct virtio_softc *vsc = sc->sc_virtio; 490 struct virtqueue *vq = &sc->sc_vq; 491 struct virtio_blk_req *vr; 492 int slot, r; 493 494 if (sc->sc_readonly) 495 return EIO; 496 497 r = virtio_enqueue_prep(vsc, vq, &slot); 498 if (r != 0) { 499 if (r == EAGAIN) { /* no free slot; dequeue first */ 500 delay(100); 501 ld_virtio_vq_done(vq); 502 r = virtio_enqueue_prep(vsc, vq, &slot); 503 if (r != 0) 504 return r; 505 } 506 return r; 507 } 508 vr = &sc->sc_reqs[slot]; 509 r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload, 510 data, blkcnt*ld->sc_secsize, NULL, 511 BUS_DMA_WRITE|BUS_DMA_NOWAIT); 512 if (r != 0) 513 return r; 514 515 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 516 VIRTIO_BLK_MIN_SEGMENTS); 517 if (r != 0) { 518 bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); 519 return r; 520 } 521 522 vr->vr_bp = (void*)0xdeadbeef; 523 vr->vr_hdr.type = VIRTIO_BLK_T_OUT; 524 vr->vr_hdr.ioprio = 0; 525 vr->vr_hdr.sector = (daddr_t) blkno * ld->sc_secsize / 512; 526 527 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 528 0, sizeof(struct virtio_blk_req_hdr), 529 BUS_DMASYNC_PREWRITE); 530 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 531 0, blkcnt*ld->sc_secsize, 532 BUS_DMASYNC_PREWRITE); 533 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 534 offsetof(struct virtio_blk_req, vr_status), 535 sizeof(uint8_t), 536 BUS_DMASYNC_PREREAD); 537 538 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 539 0, sizeof(struct virtio_blk_req_hdr), 540 true); 541 virtio_enqueue(vsc, vq, slot, vr->vr_payload, true); 542 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 543 offsetof(struct virtio_blk_req, vr_status), 544 sizeof(uint8_t), 545 false); 546 virtio_enqueue_commit(vsc, vq, slot, true); 547 548 for ( ; ; ) { 549 int dslot; 550 551 r = virtio_dequeue(vsc, vq, &dslot, NULL); 552 if (r != 0) 553 continue; 554 if (dslot != slot) { 555 ld_virtio_vq_done1(sc, vsc, vq, dslot); 556 continue; 557 } else 558 break; 559 } 560 561 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 562 0, sizeof(struct virtio_blk_req_hdr), 563 BUS_DMASYNC_POSTWRITE); 564 bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, 565 0, blkcnt*ld->sc_secsize, 566 BUS_DMASYNC_POSTWRITE); 567 bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, 568 offsetof(struct virtio_blk_req, vr_status), 569 sizeof(uint8_t), 570 BUS_DMASYNC_POSTREAD); 571 if (vr->vr_status == VIRTIO_BLK_S_OK) 572 r = 0; 573 else 574 r = EIO; 575 virtio_dequeue_commit(vsc, vq, slot); 576 577 return r; 578 } 579 580 static int 581 ld_virtio_detach(device_t self, int flags) 582 { 583 struct ld_virtio_softc *sc = device_private(self); 584 struct ld_softc *ld = &sc->sc_ld; 585 bus_dma_tag_t dmat = sc->sc_virtio->sc_dmat; 586 int r, i, qsize; 587 588 qsize = sc->sc_vq.vq_num; 589 r = ldbegindetach(ld, flags); 590 if (r != 0) 591 return r; 592 virtio_reset(sc->sc_virtio); 593 virtio_free_vq(sc->sc_virtio, &sc->sc_vq); 594 595 for (i = 0; i < qsize; i++) { 596 bus_dmamap_destroy(dmat, 597 sc->sc_reqs[i].vr_cmdsts); 598 bus_dmamap_destroy(dmat, 599 sc->sc_reqs[i].vr_payload); 600 } 601 bus_dmamem_unmap(dmat, sc->sc_reqs, 602 sizeof(struct virtio_blk_req) * qsize); 603 bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1); 604 605 ldenddetach(ld); 606 607 return 0; 608 } 609 610 MODULE(MODULE_CLASS_DRIVER, ld_virtio, "ld,virtio"); 611 612 #ifdef _MODULE 613 /* 614 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd" 615 * XXX it will be defined in the common-code module 616 */ 617 #undef CFDRIVER_DECL 618 #define CFDRIVER_DECL(name, class, attr) 619 #include "ioconf.c" 620 #endif 621 622 static int 623 ld_virtio_modcmd(modcmd_t cmd, void *opaque) 624 { 625 #ifdef _MODULE 626 /* 627 * We ignore the cfdriver_vec[] that ioconf provides, since 628 * the cfdrivers are attached already. 629 */ 630 static struct cfdriver * const no_cfdriver_vec[] = { NULL }; 631 #endif 632 int error = 0; 633 634 #ifdef _MODULE 635 switch (cmd) { 636 case MODULE_CMD_INIT: 637 error = config_init_component(no_cfdriver_vec, 638 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 639 break; 640 case MODULE_CMD_FINI: 641 error = config_fini_component(no_cfdriver_vec, 642 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 643 break; 644 default: 645 error = ENOTTY; 646 break; 647 } 648 #endif 649 650 return error; 651 } 652
Indexes created Fri Oct 03 02:09:57 GMT 2025