| 1 | /* $NetBSD: ld_virtio.c,v 1.12 2016/09/27 03:33:32 pgoyette 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 1.12 2016/09/27 03:33:32 pgoyette 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 | virtio_enqueue_abort(vsc, vq, slot); |
| 403 | bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); |
| 404 | return r; |
| 405 | } |
| 406 | |
| 407 | vr->vr_bp = bp; |
| 408 | vr->vr_hdr.type = isread?VIRTIO_BLK_T_IN:VIRTIO_BLK_T_OUT; |
| 409 | vr->vr_hdr.ioprio = 0; |
| 410 | vr->vr_hdr.sector = bp->b_rawblkno * sc->sc_ld.sc_secsize / 512; |
| 411 | |
| 412 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 413 | 0, sizeof(struct virtio_blk_req_hdr), |
| 414 | BUS_DMASYNC_PREWRITE); |
| 415 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, |
| 416 | 0, bp->b_bcount, |
| 417 | isread?BUS_DMASYNC_PREREAD:BUS_DMASYNC_PREWRITE); |
| 418 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 419 | offsetof(struct virtio_blk_req, vr_status), |
| 420 | sizeof(uint8_t), |
| 421 | BUS_DMASYNC_PREREAD); |
| 422 | |
| 423 | virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, |
| 424 | 0, sizeof(struct virtio_blk_req_hdr), |
| 425 | true); |
| 426 | virtio_enqueue(vsc, vq, slot, vr->vr_payload, !isread); |
| 427 | virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, |
| 428 | offsetof(struct virtio_blk_req, vr_status), |
| 429 | sizeof(uint8_t), |
| 430 | false); |
| 431 | virtio_enqueue_commit(vsc, vq, slot, true); |
| 432 | |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | static void |
| 437 | ld_virtio_vq_done1(struct ld_virtio_softc *sc, struct virtio_softc *vsc, |
| 438 | struct virtqueue *vq, int slot) |
| 439 | { |
| 440 | struct virtio_blk_req *vr = &sc->sc_reqs[slot]; |
| 441 | struct buf *bp = vr->vr_bp; |
| 442 | |
| 443 | vr->vr_bp = NULL; |
| 444 | |
| 445 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 446 | 0, sizeof(struct virtio_blk_req_hdr), |
| 447 | BUS_DMASYNC_POSTWRITE); |
| 448 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, |
| 449 | 0, bp->b_bcount, |
| 450 | (bp->b_flags & B_READ)?BUS_DMASYNC_POSTREAD |
| 451 | :BUS_DMASYNC_POSTWRITE); |
| 452 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 453 | sizeof(struct virtio_blk_req_hdr), sizeof(uint8_t), |
| 454 | BUS_DMASYNC_POSTREAD); |
| 455 | |
| 456 | if (vr->vr_status != VIRTIO_BLK_S_OK) { |
| 457 | bp->b_error = EIO; |
| 458 | bp->b_resid = bp->b_bcount; |
| 459 | } else { |
| 460 | bp->b_error = 0; |
| 461 | bp->b_resid = 0; |
| 462 | } |
| 463 | |
| 464 | virtio_dequeue_commit(vsc, vq, slot); |
| 465 | |
| 466 | lddone(&sc->sc_ld, bp); |
| 467 | } |
| 468 | |
| 469 | static int |
| 470 | ld_virtio_vq_done(struct virtqueue *vq) |
| 471 | { |
| 472 | struct virtio_softc *vsc = vq->vq_owner; |
| 473 | struct ld_virtio_softc *sc = device_private(vsc->sc_child); |
| 474 | int r = 0; |
| 475 | int slot; |
| 476 | |
| 477 | again: |
| 478 | if (virtio_dequeue(vsc, vq, &slot, NULL)) |
| 479 | return r; |
| 480 | r = 1; |
| 481 | |
| 482 | ld_virtio_vq_done1(sc, vsc, vq, slot); |
| 483 | goto again; |
| 484 | } |
| 485 | |
| 486 | static int |
| 487 | ld_virtio_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) |
| 488 | { |
| 489 | struct ld_virtio_softc *sc = device_private(ld->sc_dv); |
| 490 | struct virtio_softc *vsc = sc->sc_virtio; |
| 491 | struct virtqueue *vq = &sc->sc_vq; |
| 492 | struct virtio_blk_req *vr; |
| 493 | int slot, r; |
| 494 | |
| 495 | if (sc->sc_readonly) |
| 496 | return EIO; |
| 497 | |
| 498 | r = virtio_enqueue_prep(vsc, vq, &slot); |
| 499 | if (r != 0) { |
| 500 | if (r == EAGAIN) { /* no free slot; dequeue first */ |
| 501 | delay(100); |
| 502 | ld_virtio_vq_done(vq); |
| 503 | r = virtio_enqueue_prep(vsc, vq, &slot); |
| 504 | if (r != 0) |
| 505 | return r; |
| 506 | } |
| 507 | return r; |
| 508 | } |
| 509 | vr = &sc->sc_reqs[slot]; |
| 510 | r = bus_dmamap_load(vsc->sc_dmat, vr->vr_payload, |
| 511 | data, blkcnt*ld->sc_secsize, NULL, |
| 512 | BUS_DMA_WRITE|BUS_DMA_NOWAIT); |
| 513 | if (r != 0) |
| 514 | return r; |
| 515 | |
| 516 | r = virtio_enqueue_reserve(vsc, vq, slot, vr->vr_payload->dm_nsegs + |
| 517 | VIRTIO_BLK_MIN_SEGMENTS); |
| 518 | if (r != 0) { |
| 519 | bus_dmamap_unload(vsc->sc_dmat, vr->vr_payload); |
| 520 | return r; |
| 521 | } |
| 522 | |
| 523 | vr->vr_bp = (void*)0xdeadbeef; |
| 524 | vr->vr_hdr.type = VIRTIO_BLK_T_OUT; |
| 525 | vr->vr_hdr.ioprio = 0; |
| 526 | vr->vr_hdr.sector = (daddr_t) blkno * ld->sc_secsize / 512; |
| 527 | |
| 528 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 529 | 0, sizeof(struct virtio_blk_req_hdr), |
| 530 | BUS_DMASYNC_PREWRITE); |
| 531 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, |
| 532 | 0, blkcnt*ld->sc_secsize, |
| 533 | BUS_DMASYNC_PREWRITE); |
| 534 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 535 | offsetof(struct virtio_blk_req, vr_status), |
| 536 | sizeof(uint8_t), |
| 537 | BUS_DMASYNC_PREREAD); |
| 538 | |
| 539 | virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, |
| 540 | 0, sizeof(struct virtio_blk_req_hdr), |
| 541 | true); |
| 542 | virtio_enqueue(vsc, vq, slot, vr->vr_payload, true); |
| 543 | virtio_enqueue_p(vsc, vq, slot, vr->vr_cmdsts, |
| 544 | offsetof(struct virtio_blk_req, vr_status), |
| 545 | sizeof(uint8_t), |
| 546 | false); |
| 547 | virtio_enqueue_commit(vsc, vq, slot, true); |
| 548 | |
| 549 | for ( ; ; ) { |
| 550 | int dslot; |
| 551 | |
| 552 | r = virtio_dequeue(vsc, vq, &dslot, NULL); |
| 553 | if (r != 0) |
| 554 | continue; |
| 555 | if (dslot != slot) { |
| 556 | ld_virtio_vq_done1(sc, vsc, vq, dslot); |
| 557 | continue; |
| 558 | } else |
| 559 | break; |
| 560 | } |
| 561 | |
| 562 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 563 | 0, sizeof(struct virtio_blk_req_hdr), |
| 564 | BUS_DMASYNC_POSTWRITE); |
| 565 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_payload, |
| 566 | 0, blkcnt*ld->sc_secsize, |
| 567 | BUS_DMASYNC_POSTWRITE); |
| 568 | bus_dmamap_sync(vsc->sc_dmat, vr->vr_cmdsts, |
| 569 | offsetof(struct virtio_blk_req, vr_status), |
| 570 | sizeof(uint8_t), |
| 571 | BUS_DMASYNC_POSTREAD); |
| 572 | if (vr->vr_status == VIRTIO_BLK_S_OK) |
| 573 | r = 0; |
| 574 | else |
| 575 | r = EIO; |
| 576 | virtio_dequeue_commit(vsc, vq, slot); |
| 577 | |
| 578 | return r; |
| 579 | } |
| 580 | |
| 581 | static int |
| 582 | ld_virtio_detach(device_t self, int flags) |
| 583 | { |
| 584 | struct ld_virtio_softc *sc = device_private(self); |
| 585 | struct ld_softc *ld = &sc->sc_ld; |
| 586 | bus_dma_tag_t dmat = sc->sc_virtio->sc_dmat; |
| 587 | int r, i, qsize; |
| 588 | |
| 589 | qsize = sc->sc_vq.vq_num; |
| 590 | r = ldbegindetach(ld, flags); |
| 591 | if (r != 0) |
| 592 | return r; |
| 593 | virtio_reset(sc->sc_virtio); |
| 594 | virtio_free_vq(sc->sc_virtio, &sc->sc_vq); |
| 595 | |
| 596 | for (i = 0; i < qsize; i++) { |
| 597 | bus_dmamap_destroy(dmat, |
| 598 | sc->sc_reqs[i].vr_cmdsts); |
| 599 | bus_dmamap_destroy(dmat, |
| 600 | sc->sc_reqs[i].vr_payload); |
| 601 | } |
| 602 | bus_dmamem_unmap(dmat, sc->sc_reqs, |
| 603 | sizeof(struct virtio_blk_req) * qsize); |
| 604 | bus_dmamem_free(dmat, &sc->sc_reqs_seg, 1); |
| 605 | |
| 606 | ldenddetach(ld); |
| 607 | |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | MODULE(MODULE_CLASS_DRIVER, ld_virtio, "ld,virtio" ); |
| 612 | |
| 613 | #ifdef _MODULE |
| 614 | /* |
| 615 | * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd" |
| 616 | * XXX it will be defined in the common-code module |
| 617 | */ |
| 618 | #undef CFDRIVER_DECL |
| 619 | #define CFDRIVER_DECL(name, class, attr) |
| 620 | #include "ioconf.c" |
| 621 | #endif |
| 622 | |
| 623 | static int |
| 624 | ld_virtio_modcmd(modcmd_t cmd, void *opaque) |
| 625 | { |
| 626 | #ifdef _MODULE |
| 627 | /* |
| 628 | * We ignore the cfdriver_vec[] that ioconf provides, since |
| 629 | * the cfdrivers are attached already. |
| 630 | */ |
| 631 | static struct cfdriver * const no_cfdriver_vec[] = { NULL }; |
| 632 | #endif |
| 633 | int error = 0; |
| 634 | |
| 635 | #ifdef _MODULE |
| 636 | switch (cmd) { |
| 637 | case MODULE_CMD_INIT: |
| 638 | error = config_init_component(no_cfdriver_vec, |
| 639 | cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); |
| 640 | break; |
| 641 | case MODULE_CMD_FINI: |
| 642 | error = config_fini_component(no_cfdriver_vec, |
| 643 | cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio); |
| 644 | break; |
| 645 | default: |
| 646 | error = ENOTTY; |
| 647 | break; |
| 648 | } |
| 649 | #endif |
| 650 | |
| 651 | return error; |
| 652 | } |
| 653 | |