ld_virtio.c revision 1.28
1 /* $NetBSD: ld_virtio.c,v 1.28 2020/10/24 09:00:35 skrll 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 1.28 2020/10/24 09:00:35 skrll 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/ldvar.h> 43 #include <dev/pci/virtioreg.h> 44 #include <dev/pci/virtiovar.h> 45 46 #include "ioconf.h" 47 48 /* 49 * ld_virtioreg: 50 */ 51 /* Configuration registers */ 52 #define VIRTIO_BLK_CONFIG_CAPACITY 0 /* 64bit */ 53 #define VIRTIO_BLK_CONFIG_SIZE_MAX 8 /* 32bit */ 54 #define VIRTIO_BLK_CONFIG_SEG_MAX 12 /* 32bit */ 55 #define VIRTIO_BLK_CONFIG_GEOMETRY_C 16 /* 16bit */ 56 #define VIRTIO_BLK_CONFIG_GEOMETRY_H 18 /* 8bit */ 57 #define VIRTIO_BLK_CONFIG_GEOMETRY_S 19 /* 8bit */ 58 #define VIRTIO_BLK_CONFIG_BLK_SIZE 20 /* 32bit */ 59 #define VIRTIO_BLK_CONFIG_WRITEBACK 32 /* 8bit */ 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 #define VIRTIO_BLK_F_TOPOLOGY (1<<10) 71 #define VIRTIO_BLK_F_CONFIG_WCE (1<<11) 72 73 /* 74 * Each block request uses at least two segments - one for the header 75 * and one for the status. 76 */ 77 #define VIRTIO_BLK_MIN_SEGMENTS 2 78 79 #define VIRTIO_BLK_FLAG_BITS \ 80 VIRTIO_COMMON_FLAG_BITS \ 81 "\x0c""CONFIG_WCE" \ 82 "\x0b""TOPOLOGY" \ 83 "\x0a""FLUSH" \ 84 "\x08""SCSI" \ 85 "\x07""BLK_SIZE" \ 86 "\x06""RO" \ 87 "\x05""GEOMETRY" \ 88 "\x03""SEG_MAX" \ 89 "\x02""SIZE_MAX" \ 90 "\x01""BARRIER" 91 92 /* Command */ 93 #define VIRTIO_BLK_T_IN 0 94 #define VIRTIO_BLK_T_OUT 1 95 #define VIRTIO_BLK_T_FLUSH 4 96 #define VIRTIO_BLK_T_BARRIER 0x80000000 97 98 /* Sector */ 99 #define VIRTIO_BLK_BSIZE 512 100 101 /* Status */ 102 #define VIRTIO_BLK_S_OK 0 103 #define VIRTIO_BLK_S_IOERR 1 104 #define VIRTIO_BLK_S_UNSUPP 2 105 106 /* Request header structure */ 107 struct virtio_blk_req_hdr { 108 uint32_t type; /* VIRTIO_BLK_T_* */ 109 uint32_t ioprio; 110 uint64_t sector; 111 } __packed; 112 /* payload and 1 byte status follows */ 113 114 115 /* 116 * ld_virtiovar: 117 */ 118 struct virtio_blk_req { 119 struct virtio_blk_req_hdr vr_hdr; 120 uint8_t vr_status; 121 struct buf *vr_bp; 122 #define DUMMY_VR_BP ((void *)1) 123 bus_dmamap_t vr_cmdsts; 124 bus_dmamap_t vr_payload; 125 }; 126 127 struct ld_virtio_softc { 128 struct ld_softc sc_ld; 129 device_t sc_dev; 130 131 struct virtio_softc *sc_virtio; 132 struct virtqueue sc_vq; 133 134 struct virtio_blk_req *sc_reqs; 135 bus_dma_segment_t sc_reqs_seg; 136 137 int sc_readonly; 138 139 enum { 140 SYNC_FREE, SYNC_BUSY, SYNC_DONE 141 } sc_sync_use; 142 kcondvar_t sc_sync_wait; 143 kmutex_t sc_sync_wait_lock; 144 uint8_t sc_sync_status; 145 }; 146 147 static int ld_virtio_match(device_t, cfdata_t, void *); 148 static void ld_virtio_attach(device_t, device_t, void *); 149 static int ld_virtio_detach(device_t, int); 150 151 CFATTACH_DECL_NEW(ld_virtio, sizeof(struct ld_virtio_softc), 152 ld_virtio_match, ld_virtio_attach, ld_virtio_detach, NULL); 153 154 static int 155 ld_virtio_match(device_t parent, cfdata_t match, void *aux) 156 { 157 struct virtio_attach_args *va = aux; 158 159 if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_BLOCK) 160 return 1; 161 162 return 0; 163 } 164 165 static int ld_virtio_vq_done(struct virtqueue *); 166 static int ld_virtio_dump(struct ld_softc *, void *, int, int); 167 static int ld_virtio_start(struct ld_softc *, struct buf *); 168 static int ld_virtio_ioctl(struct ld_softc *, u_long, void *, int32_t, bool); 169 170 static int 171 ld_virtio_alloc_reqs(struct ld_virtio_softc *sc, int qsize) 172 { 173 int allocsize, r, rsegs, i; 174 struct ld_softc *ld = &sc->sc_ld; 175 void *vaddr; 176 177 allocsize = sizeof(struct virtio_blk_req) * qsize; 178 r = bus_dmamem_alloc(virtio_dmat(sc->sc_virtio), allocsize, 0, 0, 179 &sc->sc_reqs_seg, 1, &rsegs, BUS_DMA_WAITOK); 180 if (r != 0) { 181 aprint_error_dev(sc->sc_dev, 182 "DMA memory allocation failed, size %d, " 183 "error code %d\n", allocsize, r); 184 goto err_none; 185 } 186 r = bus_dmamem_map(virtio_dmat(sc->sc_virtio), 187 &sc->sc_reqs_seg, 1, allocsize, 188 &vaddr, BUS_DMA_WAITOK); 189 if (r != 0) { 190 aprint_error_dev(sc->sc_dev, 191 "DMA memory map failed, " 192 "error code %d\n", r); 193 goto err_dmamem_alloc; 194 } 195 sc->sc_reqs = vaddr; 196 memset(vaddr, 0, allocsize); 197 for (i = 0; i < qsize; i++) { 198 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 199 r = bus_dmamap_create(virtio_dmat(sc->sc_virtio), 200 offsetof(struct virtio_blk_req, vr_bp), 201 1, 202 offsetof(struct virtio_blk_req, vr_bp), 203 0, 204 BUS_DMA_WAITOK|BUS_DMA_ALLOCNOW, 205 &vr->vr_cmdsts); 206 if (r != 0) { 207 aprint_error_dev(sc->sc_dev, 208 "command dmamap creation failed, " 209 "error code %d\n", r); 210 goto err_reqs; 211 } 212 r = bus_dmamap_load(virtio_dmat(sc->sc_virtio), vr->vr_cmdsts, 213 &vr->vr_hdr, 214 offsetof(struct virtio_blk_req, vr_bp), 215 NULL, BUS_DMA_WAITOK); 216 if (r != 0) { 217 aprint_error_dev(sc->sc_dev, 218 "command dmamap load failed, " 219 "error code %d\n", r); 220 goto err_reqs; 221 } 222 r = bus_dmamap_create(virtio_dmat(sc->sc_virtio), 223 ld->sc_maxxfer, 224 (ld->sc_maxxfer / NBPG) + 225 VIRTIO_BLK_MIN_SEGMENTS, 226 ld->sc_maxxfer, 227 0, 228 BUS_DMA_WAITOK|BUS_DMA_ALLOCNOW, 229 &vr->vr_payload); 230 if (r != 0) { 231 aprint_error_dev(sc->sc_dev, 232 "payload dmamap creation failed, " 233 "error code %d\n", r); 234 goto err_reqs; 235 } 236 } 237 return 0; 238 239 err_reqs: 240 for (i = 0; i < qsize; i++) { 241 struct virtio_blk_req *vr = &sc->sc_reqs[i]; 242 if (vr->vr_cmdsts) { 243 bus_dmamap_destroy(virtio_dmat(sc->sc_virtio), 244 vr->vr_cmdsts); 245 vr->vr_cmdsts = 0; 246 } 247 if (vr->vr_payload) { 248 bus_dmamap_destroy(virtio_dmat(sc->sc_virtio), 249 vr->vr_payload); 250 vr->vr_payload = 0; 251 } 252 } 253 bus_dmamem_unmap(virtio_dmat(sc->sc_virtio), sc->sc_reqs, allocsize); 254 err_dmamem_alloc: 255 bus_dmamem_free(virtio_dmat(sc->sc_virtio), &sc->sc_reqs_seg, 1); 256 err_none: 257 return -1; 258 } 259 260 static void 261 ld_virtio_attach(device_t parent, device_t self, void *aux) 262 { 263 struct ld_virtio_softc *sc = device_private(self); 264 struct ld_softc *ld = &sc->sc_ld; 265 struct virtio_softc *vsc = device_private(parent); 266 uint32_t features; 267 int qsize, maxxfersize, maxnsegs; 268 269 if (virtio_child(vsc) != NULL) { 270 aprint_normal(": child already attached for %s; " 271 "something wrong...\n", device_xname(parent)); 272 return; 273 } 274 275 sc->sc_dev = self; 276 sc->sc_virtio = vsc; 277 278 virtio_child_attach_start(vsc, self, IPL_BIO, &sc->sc_vq, 279 NULL, virtio_vq_intr, VIRTIO_F_PCI_INTR_MSIX, 280 (VIRTIO_BLK_F_SIZE_MAX | VIRTIO_BLK_F_SEG_MAX | 281 VIRTIO_BLK_F_GEOMETRY | VIRTIO_BLK_F_RO | VIRTIO_BLK_F_BLK_SIZE | 282 VIRTIO_BLK_F_FLUSH | VIRTIO_BLK_F_CONFIG_WCE), 283 VIRTIO_BLK_FLAG_BITS); 284 285 features = virtio_features(vsc); 286 287 if (features & VIRTIO_BLK_F_RO) 288 sc->sc_readonly = 1; 289 else 290 sc->sc_readonly = 0; 291 292 if (features & VIRTIO_BLK_F_BLK_SIZE) { 293 ld->sc_secsize = virtio_read_device_config_4(vsc, 294 VIRTIO_BLK_CONFIG_BLK_SIZE); 295 } else 296 ld->sc_secsize = VIRTIO_BLK_BSIZE; 297 298 /* At least genfs_io assumes maxxfer == MAXPHYS. */ 299 if (features & VIRTIO_BLK_F_SIZE_MAX) { 300 maxxfersize = virtio_read_device_config_4(vsc, 301 VIRTIO_BLK_CONFIG_SIZE_MAX); 302 if (maxxfersize < MAXPHYS) { 303 aprint_error_dev(sc->sc_dev, 304 "Too small SIZE_MAX %dK minimum is %dK\n", 305 maxxfersize / 1024, MAXPHYS / 1024); 306 // goto err; 307 maxxfersize = MAXPHYS; 308 } else if (maxxfersize > MAXPHYS) { 309 aprint_normal_dev(sc->sc_dev, 310 "Clip SEG_MAX from %dK to %dK\n", 311 maxxfersize / 1024, 312 MAXPHYS / 1024); 313 maxxfersize = MAXPHYS; 314 } 315 } else 316 maxxfersize = MAXPHYS; 317 318 if (features & VIRTIO_BLK_F_SEG_MAX) { 319 maxnsegs = virtio_read_device_config_4(vsc, 320 VIRTIO_BLK_CONFIG_SEG_MAX); 321 if (maxnsegs < VIRTIO_BLK_MIN_SEGMENTS) { 322 aprint_error_dev(sc->sc_dev, 323 "Too small SEG_MAX %d minimum is %d\n", 324 maxnsegs, VIRTIO_BLK_MIN_SEGMENTS); 325 maxnsegs = maxxfersize / NBPG; 326 // goto err; 327 } 328 } else 329 maxnsegs = maxxfersize / NBPG; 330 331 /* 2 for the minimum size */ 332 maxnsegs += VIRTIO_BLK_MIN_SEGMENTS; 333 334 if (virtio_alloc_vq(vsc, &sc->sc_vq, 0, maxxfersize, maxnsegs, 335 "I/O request") != 0) { 336 goto err; 337 } 338 qsize = sc->sc_vq.vq_num; 339 sc->sc_vq.vq_done = ld_virtio_vq_done; 340 341 if (virtio_child_attach_finish(vsc) != 0) 342 goto err; 343 344 ld->sc_dv = self; 345 ld->sc_secperunit = virtio_read_device_config_8(vsc, 346 VIRTIO_BLK_CONFIG_CAPACITY) / (ld->sc_secsize / VIRTIO_BLK_BSIZE); 347 ld->sc_maxxfer = maxxfersize; 348 if (features & VIRTIO_BLK_F_GEOMETRY) { 349 ld->sc_ncylinders = virtio_read_device_config_2(vsc, 350 VIRTIO_BLK_CONFIG_GEOMETRY_C); 351 ld->sc_nheads = virtio_read_device_config_1(vsc, 352 VIRTIO_BLK_CONFIG_GEOMETRY_H); 353 ld->sc_nsectors = virtio_read_device_config_1(vsc, 354 VIRTIO_BLK_CONFIG_GEOMETRY_S); 355 } 356 ld->sc_maxqueuecnt = qsize - 1; /* reserve slot for dumps, flushes */ 357 358 if (ld_virtio_alloc_reqs(sc, qsize) < 0) 359 goto err; 360 361 cv_init(&sc->sc_sync_wait, "vblksync"); 362 mutex_init(&sc->sc_sync_wait_lock, MUTEX_DEFAULT, IPL_BIO); 363 sc->sc_sync_use = SYNC_FREE; 364 365 ld->sc_dump = ld_virtio_dump; 366 ld->sc_start = ld_virtio_start; 367 ld->sc_ioctl = ld_virtio_ioctl; 368 369 ld->sc_flags = LDF_ENABLED | LDF_MPSAFE; 370 ldattach(ld, BUFQ_DISK_DEFAULT_STRAT); 371 372 return; 373 374 err: 375 virtio_child_attach_failed(vsc); 376 return; 377 } 378 379 static int 380 ld_virtio_start(struct ld_softc *ld, struct buf *bp) 381 { 382 /* splbio */ 383 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 384 struct virtio_softc *vsc = sc->sc_virtio; 385 struct virtqueue *vq = &sc->sc_vq; 386 struct virtio_blk_req *vr; 387 int r; 388 int isread = (bp->b_flags & B_READ); 389 int slot; 390 391 if (sc->sc_readonly && !isread) 392 return EIO; 393 394 r = virtio_enqueue_prep(vsc, vq, &slot); 395 if (r != 0) 396 return r; 397 398 vr = &sc->sc_reqs[slot]; 399 KASSERT(vr->vr_bp == NULL); 400 401 r = bus_dmamap_load(virtio_dmat(vsc), vr->vr_payload, 402 bp->b_data, bp->b_bcount, NULL, 403 ((isread?BUS_DMA_READ:BUS_DMA_WRITE) 404 |BUS_DMA_NOWAIT)); 405 if (r != 0) { 406 aprint_error_dev(sc->sc_dev, 407 "payload dmamap failed, error code %d\n", r); 408 virtio_enqueue_abort(vsc, vq, slot); 409 return r; 410 } 411 412 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 413 VIRTIO_BLK_MIN_SEGMENTS); 414 if (r != 0) { 415 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 416 return r; 417 } 418 419 vr->vr_bp = bp; 420 vr->vr_hdr.type = isread?VIRTIO_BLK_T_IN:VIRTIO_BLK_T_OUT; 421 vr->vr_hdr.ioprio = 0; 422 vr->vr_hdr.sector = bp->b_rawblkno * sc->sc_ld.sc_secsize / 423 VIRTIO_BLK_BSIZE; 424 425 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 426 0, sizeof(struct virtio_blk_req_hdr), 427 BUS_DMASYNC_PREWRITE); 428 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 429 0, bp->b_bcount, 430 isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE); 431 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 432 offsetof(struct virtio_blk_req, vr_status), 433 sizeof(uint8_t), 434 BUS_DMASYNC_PREREAD); 435 436 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 437 0, sizeof(struct virtio_blk_req_hdr), 438 true); 439 virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread); 440 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 441 offsetof(struct virtio_blk_req, vr_status), 442 sizeof(uint8_t), 443 false); 444 virtio_enqueue_commit(vsc, vq, slot, true); 445 446 return 0; 447 } 448 449 static void 450 ld_virtio_vq_done1(struct ld_virtio_softc *sc, struct virtio_softc *vsc, 451 struct virtqueue *vq, int slot) 452 { 453 struct virtio_blk_req *vr = &sc->sc_reqs[slot]; 454 struct buf *bp = vr->vr_bp; 455 456 vr->vr_bp = NULL; 457 458 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 459 0, sizeof(struct virtio_blk_req_hdr), 460 BUS_DMASYNC_POSTWRITE); 461 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 462 sizeof(struct virtio_blk_req_hdr), sizeof(uint8_t), 463 BUS_DMASYNC_POSTREAD); 464 if (bp == DUMMY_VR_BP) { 465 mutex_enter(&sc->sc_sync_wait_lock); 466 sc->sc_sync_status = vr->vr_status; 467 sc->sc_sync_use = SYNC_DONE; 468 cv_broadcast(&sc->sc_sync_wait); 469 mutex_exit(&sc->sc_sync_wait_lock); 470 virtio_dequeue_commit(vsc, vq, slot); 471 return; 472 } 473 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 474 0, bp->b_bcount, 475 (bp->b_flags & B_READ)?BUS_DMASYNC_POSTREAD 476 :BUS_DMASYNC_POSTWRITE); 477 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 478 479 if (vr->vr_status != VIRTIO_BLK_S_OK) { 480 bp->b_error = EIO; 481 bp->b_resid = bp->b_bcount; 482 } else { 483 bp->b_error = 0; 484 bp->b_resid = 0; 485 } 486 487 virtio_dequeue_commit(vsc, vq, slot); 488 489 lddone(&sc->sc_ld, bp); 490 } 491 492 static int 493 ld_virtio_vq_done(struct virtqueue *vq) 494 { 495 struct virtio_softc *vsc = vq->vq_owner; 496 struct ld_virtio_softc *sc = device_private(virtio_child(vsc)); 497 int r = 0; 498 int slot; 499 500 again: 501 if (virtio_dequeue(vsc, vq, &slot, NULL)) 502 return r; 503 r = 1; 504 505 ld_virtio_vq_done1(sc, vsc, vq, slot); 506 goto again; 507 } 508 509 static int 510 ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 511 { 512 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 513 struct virtio_softc *vsc = sc->sc_virtio; 514 struct virtqueue *vq = &sc->sc_vq; 515 struct virtio_blk_req *vr; 516 int slot, r; 517 518 if (sc->sc_readonly) 519 return EIO; 520 521 r = virtio_enqueue_prep(vsc, vq, &slot); 522 if (r != 0) { 523 if (r == EAGAIN) { /* no free slot; dequeue first */ 524 delay(100); 525 ld_virtio_vq_done(vq); 526 r = virtio_enqueue_prep(vsc, vq, &slot); 527 if (r != 0) 528 return r; 529 } 530 return r; 531 } 532 vr = &sc->sc_reqs[slot]; 533 r = bus_dmamap_load(virtio_dmat(vsc), vr->vr_payload, 534 data, blkcnt*ld->sc_secsize, NULL, 535 BUS_DMA_WRITE|BUS_DMA_NOWAIT); 536 if (r != 0) 537 return r; 538 539 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 540 VIRTIO_BLK_MIN_SEGMENTS); 541 if (r != 0) { 542 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 543 return r; 544 } 545 546 vr->vr_bp = (void*)0xdeadbeef; 547 vr->vr_hdr.type = VIRTIO_BLK_T_OUT; 548 vr->vr_hdr.ioprio = 0; 549 vr->vr_hdr.sector = (daddr_t) blkno * ld->sc_secsize / 550 VIRTIO_BLK_BSIZE; 551 552 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 553 0, sizeof(struct virtio_blk_req_hdr), 554 BUS_DMASYNC_PREWRITE); 555 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 556 0, blkcnt*ld->sc_secsize, 557 BUS_DMASYNC_PREWRITE); 558 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 559 offsetof(struct virtio_blk_req, vr_status), 560 sizeof(uint8_t), 561 BUS_DMASYNC_PREREAD); 562 563 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 564 0, sizeof(struct virtio_blk_req_hdr), 565 true); 566 virtio_enqueue(vsc, vq, slot, vr->vr_payload, true); 567 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 568 offsetof(struct virtio_blk_req, vr_status), 569 sizeof(uint8_t), 570 false); 571 virtio_enqueue_commit(vsc, vq, slot, true); 572 573 for ( ; ; ) { 574 int dslot; 575 576 r = virtio_dequeue(vsc, vq, &dslot, NULL); 577 if (r != 0) 578 continue; 579 if (dslot != slot) { 580 ld_virtio_vq_done1(sc, vsc, vq, dslot); 581 continue; 582 } else 583 break; 584 } 585 586 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 587 0, sizeof(struct virtio_blk_req_hdr), 588 BUS_DMASYNC_POSTWRITE); 589 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 590 0, blkcnt*ld->sc_secsize, 591 BUS_DMASYNC_POSTWRITE); 592 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 593 offsetof(struct virtio_blk_req, vr_status), 594 sizeof(uint8_t), 595 BUS_DMASYNC_POSTREAD); 596 if (vr->vr_status == VIRTIO_BLK_S_OK) 597 r = 0; 598 else 599 r = EIO; 600 virtio_dequeue_commit(vsc, vq, slot); 601 602 return r; 603 } 604 605 static int 606 ld_virtio_detach(device_t self, int flags) 607 { 608 struct ld_virtio_softc *sc = device_private(self); 609 struct ld_softc *ld = &sc->sc_ld; 610 bus_dma_tag_t dmat = virtio_dmat(sc->sc_virtio); 611 int r, i, qsize; 612 613 qsize = sc->sc_vq.vq_num; 614 r = ldbegindetach(ld, flags); 615 if (r != 0) 616 return r; 617 virtio_reset(sc->sc_virtio); 618 virtio_free_vq(sc->sc_virtio, &sc->sc_vq); 619 620 for (i = 0; i < qsize; i++) { 621 bus_dmamap_destroy(dmat, 622 sc->sc_reqs[i].vr_cmdsts); 623 bus_dmamap_destroy(dmat, 624 sc->sc_reqs[i].vr_payload); 625 } 626 bus_dmamem_unmap(dmat, sc->sc_reqs, 627 sizeof(struct virtio_blk_req) * qsize); 628 bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1); 629 630 ldenddetach(ld); 631 632 cv_destroy(&sc->sc_sync_wait); 633 mutex_destroy(&sc->sc_sync_wait_lock); 634 635 virtio_child_detach(sc->sc_virtio); 636 637 return 0; 638 } 639 640 static int 641 ld_virtio_flush(struct ld_softc *ld, bool poll) 642 { 643 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 644 struct virtio_softc * const vsc = sc->sc_virtio; 645 const uint32_t features = virtio_features(vsc); 646 struct virtqueue *vq = &sc->sc_vq; 647 struct virtio_blk_req *vr; 648 int slot; 649 int r; 650 651 if ((features & VIRTIO_BLK_F_FLUSH) == 0) 652 return 0; 653 654 mutex_enter(&sc->sc_sync_wait_lock); 655 while (sc->sc_sync_use != SYNC_FREE) { 656 if (poll) { 657 mutex_exit(&sc->sc_sync_wait_lock); 658 ld_virtio_vq_done(vq); 659 mutex_enter(&sc->sc_sync_wait_lock); 660 continue; 661 } 662 cv_wait(&sc->sc_sync_wait, &sc->sc_sync_wait_lock); 663 } 664 sc->sc_sync_use = SYNC_BUSY; 665 mutex_exit(&sc->sc_sync_wait_lock); 666 667 r = virtio_enqueue_prep(vsc, vq, &slot); 668 if (r != 0) { 669 return r; 670 } 671 672 vr = &sc->sc_reqs[slot]; 673 KASSERT(vr->vr_bp == NULL); 674 675 r = virtio_enqueue_reserve(vsc, vq, slot, VIRTIO_BLK_MIN_SEGMENTS); 676 if (r != 0) { 677 return r; 678 } 679 680 vr->vr_bp = DUMMY_VR_BP; 681 vr->vr_hdr.type = VIRTIO_BLK_T_FLUSH; 682 vr->vr_hdr.ioprio = 0; 683 vr->vr_hdr.sector = 0; 684 685 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 686 0, sizeof(struct virtio_blk_req_hdr), 687 BUS_DMASYNC_PREWRITE); 688 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 689 offsetof(struct virtio_blk_req, vr_status), 690 sizeof(uint8_t), 691 BUS_DMASYNC_PREREAD); 692 693 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 694 0, sizeof(struct virtio_blk_req_hdr), 695 true); 696 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 697 offsetof(struct virtio_blk_req, vr_status), 698 sizeof(uint8_t), 699 false); 700 virtio_enqueue_commit(vsc, vq, slot, true); 701 702 mutex_enter(&sc->sc_sync_wait_lock); 703 while (sc->sc_sync_use != SYNC_DONE) { 704 if (poll) { 705 mutex_exit(&sc->sc_sync_wait_lock); 706 ld_virtio_vq_done(vq); 707 mutex_enter(&sc->sc_sync_wait_lock); 708 continue; 709 } 710 cv_wait(&sc->sc_sync_wait, &sc->sc_sync_wait_lock); 711 } 712 713 if (sc->sc_sync_status == VIRTIO_BLK_S_OK) 714 r = 0; 715 else 716 r = EIO; 717 718 sc->sc_sync_use = SYNC_FREE; 719 cv_broadcast(&sc->sc_sync_wait); 720 mutex_exit(&sc->sc_sync_wait_lock); 721 722 return r; 723 } 724 725 static int 726 ld_virtio_getcache(struct ld_softc *ld, int *bitsp) 727 { 728 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 729 struct virtio_softc * const vsc = sc->sc_virtio; 730 const uint32_t features = virtio_features(vsc); 731 732 *bitsp = DKCACHE_READ; 733 if ((features & VIRTIO_BLK_F_CONFIG_WCE) != 0) 734 *bitsp |= DKCACHE_WCHANGE; 735 if (virtio_read_device_config_1(vsc, 736 VIRTIO_BLK_CONFIG_WRITEBACK) != 0x00) 737 *bitsp |= DKCACHE_WRITE; 738 739 return 0; 740 } 741 742 static int 743 ld_virtio_setcache(struct ld_softc *ld, int bits) 744 { 745 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 746 struct virtio_softc * const vsc = sc->sc_virtio; 747 const uint8_t wce = (bits & DKCACHE_WRITE) ? 0x01 : 0x00; 748 749 virtio_write_device_config_1(vsc, 750 VIRTIO_BLK_CONFIG_WRITEBACK, wce); 751 if (virtio_read_device_config_1(vsc, 752 VIRTIO_BLK_CONFIG_WRITEBACK) != wce) 753 return EIO; 754 755 return 0; 756 } 757 758 static int 759 ld_virtio_ioctl(struct ld_softc *ld, u_long cmd, void *addr, int32_t flag, bool poll) 760 { 761 int error; 762 763 switch (cmd) { 764 case DIOCCACHESYNC: 765 error = ld_virtio_flush(ld, poll); 766 break; 767 768 case DIOCGCACHE: 769 error = ld_virtio_getcache(ld, (int *)addr); 770 break; 771 772 case DIOCSCACHE: 773 error = ld_virtio_setcache(ld, *(int *)addr); 774 break; 775 776 default: 777 error = EPASSTHROUGH; 778 break; 779 } 780 781 return error; 782 } 783 784 MODULE(MODULE_CLASS_DRIVER, ld_virtio, "ld,virtio"); 785 786 #ifdef _MODULE 787 /* 788 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd" 789 * XXX it will be defined in the common-code module 790 */ 791 #undef CFDRIVER_DECL 792 #define CFDRIVER_DECL(name, class, attr) 793 #include "ioconf.c" 794 #endif 795 796 static int 797 ld_virtio_modcmd(modcmd_t cmd, void *opaque) 798 { 799 #ifdef _MODULE 800 /* 801 * We ignore the cfdriver_vec[] that ioconf provides, since 802 * the cfdrivers are attached already. 803 */ 804 static struct cfdriver * const no_cfdriver_vec[] = { NULL }; 805 #endif 806 int error = 0; 807 808 #ifdef _MODULE 809 switch (cmd) { 810 case MODULE_CMD_INIT: 811 error = config_init_component(no_cfdriver_vec, 812 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 813 break; 814 case MODULE_CMD_FINI: 815 error = config_fini_component(no_cfdriver_vec, 816 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 817 break; 818 default: 819 error = ENOTTY; 820 break; 821 } 822 #endif 823 824 return error; 825 } 826
Indexes created Mon Sep 29 18:09:42 GMT 2025