ld_virtio.c revision 1.31
1 /* $NetBSD: ld_virtio.c,v 1.31 2023/03/23 03:27:48 yamaguchi 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 1.31 2023/03/23 03:27:48 yamaguchi 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 "b\x0b" "CONFIG_WCE\0" \ 82 "b\x0a" "TOPOLOGY\0" \ 83 "b\x09" "FLUSH\0" \ 84 "b\x07" "SCSI\0" \ 85 "b\x06" "BLK_SIZE\0" \ 86 "b\x05" "RO\0" \ 87 "b\x04" "GEOMETRY\0" \ 88 "b\x02" "SEG_MAX\0" \ 89 "b\x01" "SIZE_MAX\0" \ 90 "b\x00" "BARRIER\0" 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 == VIRTIO_DEVICE_ID_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 uint64_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, 279 (VIRTIO_BLK_F_SIZE_MAX | VIRTIO_BLK_F_SEG_MAX | 280 VIRTIO_BLK_F_GEOMETRY | VIRTIO_BLK_F_RO | VIRTIO_BLK_F_BLK_SIZE | 281 VIRTIO_BLK_F_FLUSH | VIRTIO_BLK_F_CONFIG_WCE), 282 VIRTIO_BLK_FLAG_BITS); 283 284 features = virtio_features(vsc); 285 if (features == 0) 286 goto err; 287 288 if (features & VIRTIO_BLK_F_RO) 289 sc->sc_readonly = 1; 290 else 291 sc->sc_readonly = 0; 292 293 if (features & VIRTIO_BLK_F_BLK_SIZE) { 294 ld->sc_secsize = virtio_read_device_config_4(vsc, 295 VIRTIO_BLK_CONFIG_BLK_SIZE); 296 } else 297 ld->sc_secsize = VIRTIO_BLK_BSIZE; 298 299 /* At least genfs_io assumes maxxfer == MAXPHYS. */ 300 if (features & VIRTIO_BLK_F_SIZE_MAX) { 301 maxxfersize = virtio_read_device_config_4(vsc, 302 VIRTIO_BLK_CONFIG_SIZE_MAX); 303 if (maxxfersize < MAXPHYS) { 304 aprint_error_dev(sc->sc_dev, 305 "Too small SIZE_MAX %dK minimum is %dK\n", 306 maxxfersize / 1024, MAXPHYS / 1024); 307 // goto err; 308 maxxfersize = MAXPHYS; 309 } else if (maxxfersize > MAXPHYS) { 310 aprint_normal_dev(sc->sc_dev, 311 "Clip SEG_MAX from %dK to %dK\n", 312 maxxfersize / 1024, 313 MAXPHYS / 1024); 314 maxxfersize = MAXPHYS; 315 } 316 } else 317 maxxfersize = MAXPHYS; 318 319 if (features & VIRTIO_BLK_F_SEG_MAX) { 320 maxnsegs = virtio_read_device_config_4(vsc, 321 VIRTIO_BLK_CONFIG_SEG_MAX); 322 if (maxnsegs < VIRTIO_BLK_MIN_SEGMENTS) { 323 aprint_error_dev(sc->sc_dev, 324 "Too small SEG_MAX %d minimum is %d\n", 325 maxnsegs, VIRTIO_BLK_MIN_SEGMENTS); 326 maxnsegs = maxxfersize / NBPG; 327 // goto err; 328 } 329 } else 330 maxnsegs = maxxfersize / NBPG; 331 332 /* 2 for the minimum size */ 333 maxnsegs += VIRTIO_BLK_MIN_SEGMENTS; 334 335 if (virtio_alloc_vq(vsc, &sc->sc_vq, 0, maxxfersize, maxnsegs, 336 "I/O request") != 0) { 337 goto err; 338 } 339 qsize = sc->sc_vq.vq_num; 340 sc->sc_vq.vq_done = ld_virtio_vq_done; 341 342 if (virtio_child_attach_finish(vsc, &sc->sc_vq, 1, 343 NULL, virtio_vq_intr, VIRTIO_F_INTR_MSIX) != 0) 344 goto err; 345 346 ld->sc_dv = self; 347 ld->sc_secperunit = virtio_read_device_config_8(vsc, 348 VIRTIO_BLK_CONFIG_CAPACITY) / (ld->sc_secsize / VIRTIO_BLK_BSIZE); 349 ld->sc_maxxfer = maxxfersize; 350 if (features & VIRTIO_BLK_F_GEOMETRY) { 351 ld->sc_ncylinders = virtio_read_device_config_2(vsc, 352 VIRTIO_BLK_CONFIG_GEOMETRY_C); 353 ld->sc_nheads = virtio_read_device_config_1(vsc, 354 VIRTIO_BLK_CONFIG_GEOMETRY_H); 355 ld->sc_nsectors = virtio_read_device_config_1(vsc, 356 VIRTIO_BLK_CONFIG_GEOMETRY_S); 357 } 358 ld->sc_maxqueuecnt = qsize - 1; /* reserve slot for dumps, flushes */ 359 360 if (ld_virtio_alloc_reqs(sc, qsize) < 0) 361 goto err; 362 363 cv_init(&sc->sc_sync_wait, "vblksync"); 364 mutex_init(&sc->sc_sync_wait_lock, MUTEX_DEFAULT, IPL_BIO); 365 sc->sc_sync_use = SYNC_FREE; 366 367 ld->sc_dump = ld_virtio_dump; 368 ld->sc_start = ld_virtio_start; 369 ld->sc_ioctl = ld_virtio_ioctl; 370 371 ld->sc_flags = LDF_ENABLED | LDF_MPSAFE; 372 ldattach(ld, BUFQ_DISK_DEFAULT_STRAT); 373 374 return; 375 376 err: 377 virtio_child_attach_failed(vsc); 378 return; 379 } 380 381 static int 382 ld_virtio_start(struct ld_softc *ld, struct buf *bp) 383 { 384 /* splbio */ 385 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 386 struct virtio_softc *vsc = sc->sc_virtio; 387 struct virtqueue *vq = &sc->sc_vq; 388 struct virtio_blk_req *vr; 389 int r; 390 int isread = (bp->b_flags & B_READ); 391 int slot; 392 393 if (sc->sc_readonly && !isread) 394 return EIO; 395 396 r = virtio_enqueue_prep(vsc, vq, &slot); 397 if (r != 0) 398 return r; 399 400 vr = &sc->sc_reqs[slot]; 401 KASSERT(vr->vr_bp == NULL); 402 403 r = bus_dmamap_load(virtio_dmat(vsc), vr->vr_payload, 404 bp->b_data, bp->b_bcount, NULL, 405 ((isread?BUS_DMA_READ:BUS_DMA_WRITE) 406 |BUS_DMA_NOWAIT)); 407 if (r != 0) { 408 aprint_error_dev(sc->sc_dev, 409 "payload dmamap failed, error code %d\n", r); 410 virtio_enqueue_abort(vsc, vq, slot); 411 return r; 412 } 413 414 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 415 VIRTIO_BLK_MIN_SEGMENTS); 416 if (r != 0) { 417 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 418 return r; 419 } 420 421 vr->vr_bp = bp; 422 vr->vr_hdr.type = virtio_rw32(vsc, 423 isread ? VIRTIO_BLK_T_IN : VIRTIO_BLK_T_OUT); 424 vr->vr_hdr.ioprio = virtio_rw32(vsc, 0); 425 vr->vr_hdr.sector = virtio_rw64(vsc, 426 bp->b_rawblkno * sc->sc_ld.sc_secsize / 427 VIRTIO_BLK_BSIZE); 428 429 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 430 0, sizeof(struct virtio_blk_req_hdr), 431 BUS_DMASYNC_PREWRITE); 432 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 433 0, bp->b_bcount, 434 isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE); 435 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 436 offsetof(struct virtio_blk_req, vr_status), 437 sizeof(uint8_t), 438 BUS_DMASYNC_PREREAD); 439 440 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 441 0, sizeof(struct virtio_blk_req_hdr), 442 true); 443 virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread); 444 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 445 offsetof(struct virtio_blk_req, vr_status), 446 sizeof(uint8_t), 447 false); 448 virtio_enqueue_commit(vsc, vq, slot, true); 449 450 return 0; 451 } 452 453 static void 454 ld_virtio_vq_done1(struct ld_virtio_softc *sc, struct virtio_softc *vsc, 455 struct virtqueue *vq, int slot) 456 { 457 struct virtio_blk_req *vr = &sc->sc_reqs[slot]; 458 struct buf *bp = vr->vr_bp; 459 460 vr->vr_bp = NULL; 461 462 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 463 0, sizeof(struct virtio_blk_req_hdr), 464 BUS_DMASYNC_POSTWRITE); 465 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 466 sizeof(struct virtio_blk_req_hdr), sizeof(uint8_t), 467 BUS_DMASYNC_POSTREAD); 468 if (bp == DUMMY_VR_BP) { 469 mutex_enter(&sc->sc_sync_wait_lock); 470 sc->sc_sync_status = vr->vr_status; 471 sc->sc_sync_use = SYNC_DONE; 472 cv_broadcast(&sc->sc_sync_wait); 473 mutex_exit(&sc->sc_sync_wait_lock); 474 virtio_dequeue_commit(vsc, vq, slot); 475 return; 476 } 477 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 478 0, bp->b_bcount, 479 (bp->b_flags & B_READ)?BUS_DMASYNC_POSTREAD 480 :BUS_DMASYNC_POSTWRITE); 481 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 482 483 if (vr->vr_status != VIRTIO_BLK_S_OK) { 484 bp->b_error = EIO; 485 bp->b_resid = bp->b_bcount; 486 } else { 487 bp->b_error = 0; 488 bp->b_resid = 0; 489 } 490 491 virtio_dequeue_commit(vsc, vq, slot); 492 493 lddone(&sc->sc_ld, bp); 494 } 495 496 static int 497 ld_virtio_vq_done(struct virtqueue *vq) 498 { 499 struct virtio_softc *vsc = vq->vq_owner; 500 struct ld_virtio_softc *sc = device_private(virtio_child(vsc)); 501 int r = 0; 502 int slot; 503 504 again: 505 if (virtio_dequeue(vsc, vq, &slot, NULL)) 506 return r; 507 r = 1; 508 509 ld_virtio_vq_done1(sc, vsc, vq, slot); 510 goto again; 511 } 512 513 static int 514 ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 515 { 516 struct ld_virtio_softc *sc = device_private(ld->sc_dv); 517 struct virtio_softc *vsc = sc->sc_virtio; 518 struct virtqueue *vq = &sc->sc_vq; 519 struct virtio_blk_req *vr; 520 int slot, r; 521 522 if (sc->sc_readonly) 523 return EIO; 524 525 r = virtio_enqueue_prep(vsc, vq, &slot); 526 if (r != 0) { 527 if (r == EAGAIN) { /* no free slot; dequeue first */ 528 delay(100); 529 ld_virtio_vq_done(vq); 530 r = virtio_enqueue_prep(vsc, vq, &slot); 531 if (r != 0) 532 return r; 533 } 534 return r; 535 } 536 vr = &sc->sc_reqs[slot]; 537 r = bus_dmamap_load(virtio_dmat(vsc), vr->vr_payload, 538 data, blkcnt*ld->sc_secsize, NULL, 539 BUS_DMA_WRITE|BUS_DMA_NOWAIT); 540 if (r != 0) 541 return r; 542 543 r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + 544 VIRTIO_BLK_MIN_SEGMENTS); 545 if (r != 0) { 546 bus_dmamap_unload(virtio_dmat(vsc), vr->vr_payload); 547 return r; 548 } 549 550 vr->vr_bp = (void*)0xdeadbeef; 551 vr->vr_hdr.type = virtio_rw32(vsc, VIRTIO_BLK_T_OUT); 552 vr->vr_hdr.ioprio = virtio_rw32(vsc, 0); 553 vr->vr_hdr.sector = virtio_rw64(vsc, 554 (daddr_t) blkno * ld->sc_secsize / 555 VIRTIO_BLK_BSIZE); 556 557 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 558 0, sizeof(struct virtio_blk_req_hdr), 559 BUS_DMASYNC_PREWRITE); 560 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 561 0, blkcnt*ld->sc_secsize, 562 BUS_DMASYNC_PREWRITE); 563 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 564 offsetof(struct virtio_blk_req, vr_status), 565 sizeof(uint8_t), 566 BUS_DMASYNC_PREREAD); 567 568 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 569 0, sizeof(struct virtio_blk_req_hdr), 570 true); 571 virtio_enqueue(vsc, vq, slot, vr->vr_payload, true); 572 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 573 offsetof(struct virtio_blk_req, vr_status), 574 sizeof(uint8_t), 575 false); 576 virtio_enqueue_commit(vsc, vq, slot, true); 577 578 for ( ; ; ) { 579 int dslot; 580 581 r = virtio_dequeue(vsc, vq, &dslot, NULL); 582 if (r != 0) 583 continue; 584 if (dslot != slot) { 585 ld_virtio_vq_done1(sc, vsc, vq, dslot); 586 continue; 587 } else 588 break; 589 } 590 591 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 592 0, sizeof(struct virtio_blk_req_hdr), 593 BUS_DMASYNC_POSTWRITE); 594 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_payload, 595 0, blkcnt*ld->sc_secsize, 596 BUS_DMASYNC_POSTWRITE); 597 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 598 offsetof(struct virtio_blk_req, vr_status), 599 sizeof(uint8_t), 600 BUS_DMASYNC_POSTREAD); 601 if (vr->vr_status == VIRTIO_BLK_S_OK) 602 r = 0; 603 else 604 r = EIO; 605 virtio_dequeue_commit(vsc, vq, slot); 606 607 return r; 608 } 609 610 static int 611 ld_virtio_detach(device_t self, int flags) 612 { 613 struct ld_virtio_softc *sc = device_private(self); 614 struct ld_softc *ld = &sc->sc_ld; 615 bus_dma_tag_t dmat = virtio_dmat(sc->sc_virtio); 616 int r, i, qsize; 617 618 qsize = sc->sc_vq.vq_num; 619 r = ldbegindetach(ld, flags); 620 if (r != 0) 621 return r; 622 virtio_reset(sc->sc_virtio); 623 virtio_free_vq(sc->sc_virtio, &sc->sc_vq); 624 625 for (i = 0; i < qsize; i++) { 626 bus_dmamap_destroy(dmat, 627 sc->sc_reqs[i].vr_cmdsts); 628 bus_dmamap_destroy(dmat, 629 sc->sc_reqs[i].vr_payload); 630 } 631 bus_dmamem_unmap(dmat, sc->sc_reqs, 632 sizeof(struct virtio_blk_req) * qsize); 633 bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1); 634 635 ldenddetach(ld); 636 637 cv_destroy(&sc->sc_sync_wait); 638 mutex_destroy(&sc->sc_sync_wait_lock); 639 640 virtio_child_detach(sc->sc_virtio); 641 642 return 0; 643 } 644 645 static int 646 ld_virtio_flush(struct ld_softc *ld, bool poll) 647 { 648 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 649 struct virtio_softc * const vsc = sc->sc_virtio; 650 const uint64_t features = virtio_features(vsc); 651 struct virtqueue *vq = &sc->sc_vq; 652 struct virtio_blk_req *vr; 653 int slot; 654 int r; 655 656 if ((features & VIRTIO_BLK_F_FLUSH) == 0) 657 return 0; 658 659 mutex_enter(&sc->sc_sync_wait_lock); 660 while (sc->sc_sync_use != SYNC_FREE) { 661 if (poll) { 662 mutex_exit(&sc->sc_sync_wait_lock); 663 ld_virtio_vq_done(vq); 664 mutex_enter(&sc->sc_sync_wait_lock); 665 continue; 666 } 667 cv_wait(&sc->sc_sync_wait, &sc->sc_sync_wait_lock); 668 } 669 sc->sc_sync_use = SYNC_BUSY; 670 mutex_exit(&sc->sc_sync_wait_lock); 671 672 r = virtio_enqueue_prep(vsc, vq, &slot); 673 if (r != 0) { 674 return r; 675 } 676 677 vr = &sc->sc_reqs[slot]; 678 KASSERT(vr->vr_bp == NULL); 679 680 r = virtio_enqueue_reserve(vsc, vq, slot, VIRTIO_BLK_MIN_SEGMENTS); 681 if (r != 0) { 682 return r; 683 } 684 685 vr->vr_bp = DUMMY_VR_BP; 686 vr->vr_hdr.type = virtio_rw32(vsc, VIRTIO_BLK_T_FLUSH); 687 vr->vr_hdr.ioprio = virtio_rw32(vsc, 0); 688 vr->vr_hdr.sector = virtio_rw64(vsc, 0); 689 690 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 691 0, sizeof(struct virtio_blk_req_hdr), 692 BUS_DMASYNC_PREWRITE); 693 bus_dmamap_sync(virtio_dmat(vsc), vr->vr_cmdsts, 694 offsetof(struct virtio_blk_req, vr_status), 695 sizeof(uint8_t), 696 BUS_DMASYNC_PREREAD); 697 698 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 699 0, sizeof(struct virtio_blk_req_hdr), 700 true); 701 virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, 702 offsetof(struct virtio_blk_req, vr_status), 703 sizeof(uint8_t), 704 false); 705 virtio_enqueue_commit(vsc, vq, slot, true); 706 707 mutex_enter(&sc->sc_sync_wait_lock); 708 while (sc->sc_sync_use != SYNC_DONE) { 709 if (poll) { 710 mutex_exit(&sc->sc_sync_wait_lock); 711 ld_virtio_vq_done(vq); 712 mutex_enter(&sc->sc_sync_wait_lock); 713 continue; 714 } 715 cv_wait(&sc->sc_sync_wait, &sc->sc_sync_wait_lock); 716 } 717 718 if (sc->sc_sync_status == VIRTIO_BLK_S_OK) 719 r = 0; 720 else 721 r = EIO; 722 723 sc->sc_sync_use = SYNC_FREE; 724 cv_broadcast(&sc->sc_sync_wait); 725 mutex_exit(&sc->sc_sync_wait_lock); 726 727 return r; 728 } 729 730 static int 731 ld_virtio_getcache(struct ld_softc *ld, int *bitsp) 732 { 733 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 734 struct virtio_softc * const vsc = sc->sc_virtio; 735 const uint64_t features = virtio_features(vsc); 736 737 *bitsp = DKCACHE_READ; 738 if ((features & VIRTIO_BLK_F_CONFIG_WCE) != 0) 739 *bitsp |= DKCACHE_WCHANGE; 740 if (virtio_read_device_config_1(vsc, 741 VIRTIO_BLK_CONFIG_WRITEBACK) != 0x00) 742 *bitsp |= DKCACHE_WRITE; 743 744 return 0; 745 } 746 747 static int 748 ld_virtio_setcache(struct ld_softc *ld, int bits) 749 { 750 struct ld_virtio_softc * const sc = device_private(ld->sc_dv); 751 struct virtio_softc * const vsc = sc->sc_virtio; 752 const uint8_t wce = (bits & DKCACHE_WRITE) ? 0x01 : 0x00; 753 754 virtio_write_device_config_1(vsc, 755 VIRTIO_BLK_CONFIG_WRITEBACK, wce); 756 if (virtio_read_device_config_1(vsc, 757 VIRTIO_BLK_CONFIG_WRITEBACK) != wce) 758 return EIO; 759 760 return 0; 761 } 762 763 static int 764 ld_virtio_ioctl(struct ld_softc *ld, u_long cmd, void *addr, int32_t flag, bool poll) 765 { 766 int error; 767 768 switch (cmd) { 769 case DIOCCACHESYNC: 770 error = ld_virtio_flush(ld, poll); 771 break; 772 773 case DIOCGCACHE: 774 error = ld_virtio_getcache(ld, (int *)addr); 775 break; 776 777 case DIOCSCACHE: 778 error = ld_virtio_setcache(ld, *(int *)addr); 779 break; 780 781 default: 782 error = EPASSTHROUGH; 783 break; 784 } 785 786 return error; 787 } 788 789 MODULE(MODULE_CLASS_DRIVER, ld_virtio, "ld,virtio"); 790 791 #ifdef _MODULE 792 /* 793 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd" 794 * XXX it will be defined in the common-code module 795 */ 796 #undef CFDRIVER_DECL 797 #define CFDRIVER_DECL(name, class, attr) 798 #include "ioconf.c" 799 #endif 800 801 static int 802 ld_virtio_modcmd(modcmd_t cmd, void *opaque) 803 { 804 #ifdef _MODULE 805 /* 806 * We ignore the cfdriver_vec[] that ioconf provides, since 807 * the cfdrivers are attached already. 808 */ 809 static struct cfdriver * const no_cfdriver_vec[] = { NULL }; 810 #endif 811 int error = 0; 812 813 #ifdef _MODULE 814 switch (cmd) { 815 case MODULE_CMD_INIT: 816 error = config_init_component(no_cfdriver_vec, 817 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 818 break; 819 case MODULE_CMD_FINI: 820 error = config_fini_component(no_cfdriver_vec, 821 cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); 822 break; 823 default: 824 error = ENOTTY; 825 break; 826 } 827 #endif 828 829 return error; 830 } 831
Indexes created Mon Sep 29 03:10:08 GMT 2025