1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. 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 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "spdk/stdinc.h" 35 36 #include "spdk/mmio.h" 37 #include "spdk/string.h" 38 #include "spdk/env.h" 39 40 #include "spdk_internal/virtio.h" 41 #include "spdk_internal/memory.h" 42 43 struct virtio_hw { 44 uint8_t use_msix; 45 uint32_t notify_off_multiplier; 46 uint8_t *isr; 47 uint16_t *notify_base; 48 49 struct { 50 /** Mem-mapped resources from given PCI BAR */ 51 void *vaddr; 52 53 /** Length of the address space */ 54 uint32_t len; 55 } pci_bar[6]; 56 57 struct virtio_pci_common_cfg *common_cfg; 58 struct spdk_pci_device *pci_dev; 59 60 /** Device-specific PCI config space */ 61 void *dev_cfg; 62 }; 63 64 struct virtio_pci_probe_ctx { 65 virtio_pci_create_cb enum_cb; 66 void *enum_ctx; 67 uint16_t device_id; 68 }; 69 70 /* 71 * Following macros are derived from linux/pci_regs.h, however, 72 * we can't simply include that header here, as there is no such 73 * file for non-Linux platform. 74 */ 75 #define PCI_CAPABILITY_LIST 0x34 76 #define PCI_CAP_ID_VNDR 0x09 77 #define PCI_CAP_ID_MSIX 0x11 78 79 static inline int 80 check_vq_phys_addr_ok(struct virtqueue *vq) 81 { 82 /* Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit, 83 * and only accepts 32 bit page frame number. 84 * Check if the allocated physical memory exceeds 16TB. 85 */ 86 if ((vq->vq_ring_mem + vq->vq_ring_size - 1) >> 87 (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) { 88 SPDK_ERRLOG("vring address shouldn't be above 16TB!\n"); 89 return 0; 90 } 91 92 return 1; 93 } 94 95 static void 96 free_virtio_hw(struct virtio_hw *hw) 97 { 98 unsigned i; 99 100 for (i = 0; i < 6; ++i) { 101 if (hw->pci_bar[i].vaddr == NULL) { 102 continue; 103 } 104 105 spdk_pci_device_unmap_bar(hw->pci_dev, i, hw->pci_bar[i].vaddr); 106 } 107 108 free(hw); 109 } 110 111 static void 112 pci_dump_json_info(struct virtio_dev *dev, struct spdk_json_write_ctx *w) 113 { 114 struct virtio_hw *hw = dev->ctx; 115 struct spdk_pci_addr pci_addr = spdk_pci_device_get_addr((struct spdk_pci_device *)hw->pci_dev); 116 char addr[32]; 117 118 spdk_json_write_name(w, "type"); 119 if (dev->modern) { 120 spdk_json_write_string(w, "pci-modern"); 121 } else { 122 spdk_json_write_string(w, "pci-legacy"); 123 } 124 125 spdk_pci_addr_fmt(addr, sizeof(addr), &pci_addr); 126 spdk_json_write_named_string(w, "pci_address", addr); 127 } 128 129 static void 130 pci_write_json_config(struct virtio_dev *dev, struct spdk_json_write_ctx *w) 131 { 132 struct virtio_hw *hw = dev->ctx; 133 struct spdk_pci_addr pci_addr = spdk_pci_device_get_addr(hw->pci_dev); 134 char addr[32]; 135 136 spdk_pci_addr_fmt(addr, sizeof(addr), &pci_addr); 137 138 spdk_json_write_named_string(w, "trtype", "pci"); 139 spdk_json_write_named_string(w, "traddr", addr); 140 } 141 142 static inline void 143 io_write64_twopart(uint64_t val, uint32_t *lo, uint32_t *hi) 144 { 145 spdk_mmio_write_4(lo, val & ((1ULL << 32) - 1)); 146 spdk_mmio_write_4(hi, val >> 32); 147 } 148 149 static int 150 modern_read_dev_config(struct virtio_dev *dev, size_t offset, 151 void *dst, int length) 152 { 153 struct virtio_hw *hw = dev->ctx; 154 int i; 155 uint8_t *p; 156 uint8_t old_gen, new_gen; 157 158 do { 159 old_gen = spdk_mmio_read_1(&hw->common_cfg->config_generation); 160 161 p = dst; 162 for (i = 0; i < length; i++) { 163 *p++ = spdk_mmio_read_1((uint8_t *)hw->dev_cfg + offset + i); 164 } 165 166 new_gen = spdk_mmio_read_1(&hw->common_cfg->config_generation); 167 } while (old_gen != new_gen); 168 169 return 0; 170 } 171 172 static int 173 modern_write_dev_config(struct virtio_dev *dev, size_t offset, 174 const void *src, int length) 175 { 176 struct virtio_hw *hw = dev->ctx; 177 int i; 178 const uint8_t *p = src; 179 180 for (i = 0; i < length; i++) { 181 spdk_mmio_write_1(((uint8_t *)hw->dev_cfg) + offset + i, *p++); 182 } 183 184 return 0; 185 } 186 187 static uint64_t 188 modern_get_features(struct virtio_dev *dev) 189 { 190 struct virtio_hw *hw = dev->ctx; 191 uint32_t features_lo, features_hi; 192 193 spdk_mmio_write_4(&hw->common_cfg->device_feature_select, 0); 194 features_lo = spdk_mmio_read_4(&hw->common_cfg->device_feature); 195 196 spdk_mmio_write_4(&hw->common_cfg->device_feature_select, 1); 197 features_hi = spdk_mmio_read_4(&hw->common_cfg->device_feature); 198 199 return ((uint64_t)features_hi << 32) | features_lo; 200 } 201 202 static int 203 modern_set_features(struct virtio_dev *dev, uint64_t features) 204 { 205 struct virtio_hw *hw = dev->ctx; 206 207 if ((features & (1ULL << VIRTIO_F_VERSION_1)) == 0) { 208 SPDK_ERRLOG("VIRTIO_F_VERSION_1 feature is not enabled.\n"); 209 return -EINVAL; 210 } 211 212 spdk_mmio_write_4(&hw->common_cfg->guest_feature_select, 0); 213 spdk_mmio_write_4(&hw->common_cfg->guest_feature, features & ((1ULL << 32) - 1)); 214 215 spdk_mmio_write_4(&hw->common_cfg->guest_feature_select, 1); 216 spdk_mmio_write_4(&hw->common_cfg->guest_feature, features >> 32); 217 218 dev->negotiated_features = features; 219 220 return 0; 221 } 222 223 static void 224 modern_destruct_dev(struct virtio_dev *vdev) 225 { 226 struct virtio_hw *hw = vdev->ctx; 227 struct spdk_pci_device *pci_dev = hw->pci_dev; 228 229 free_virtio_hw(hw); 230 spdk_pci_device_detach(pci_dev); 231 } 232 233 static uint8_t 234 modern_get_status(struct virtio_dev *dev) 235 { 236 struct virtio_hw *hw = dev->ctx; 237 238 return spdk_mmio_read_1(&hw->common_cfg->device_status); 239 } 240 241 static void 242 modern_set_status(struct virtio_dev *dev, uint8_t status) 243 { 244 struct virtio_hw *hw = dev->ctx; 245 246 spdk_mmio_write_1(&hw->common_cfg->device_status, status); 247 } 248 249 static uint16_t 250 modern_get_queue_size(struct virtio_dev *dev, uint16_t queue_id) 251 { 252 struct virtio_hw *hw = dev->ctx; 253 254 spdk_mmio_write_2(&hw->common_cfg->queue_select, queue_id); 255 return spdk_mmio_read_2(&hw->common_cfg->queue_size); 256 } 257 258 static int 259 modern_setup_queue(struct virtio_dev *dev, struct virtqueue *vq) 260 { 261 struct virtio_hw *hw = dev->ctx; 262 uint64_t desc_addr, avail_addr, used_addr; 263 uint16_t notify_off; 264 void *queue_mem; 265 uint64_t queue_mem_phys_addr; 266 267 /* To ensure physical address contiguity we make the queue occupy 268 * only a single hugepage (2MB). As of Virtio 1.0, the queue size 269 * always falls within this limit. 270 */ 271 if (vq->vq_ring_size > VALUE_2MB) { 272 return -ENOMEM; 273 } 274 275 queue_mem = spdk_dma_zmalloc(vq->vq_ring_size, VALUE_2MB, &queue_mem_phys_addr); 276 if (queue_mem == NULL) { 277 return -ENOMEM; 278 } 279 280 vq->vq_ring_mem = queue_mem_phys_addr; 281 vq->vq_ring_virt_mem = queue_mem; 282 283 if (!check_vq_phys_addr_ok(vq)) { 284 spdk_dma_free(queue_mem); 285 return -ENOMEM; 286 } 287 288 desc_addr = vq->vq_ring_mem; 289 avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc); 290 used_addr = (avail_addr + offsetof(struct vring_avail, ring[vq->vq_nentries]) 291 + VIRTIO_PCI_VRING_ALIGN - 1) & ~(VIRTIO_PCI_VRING_ALIGN - 1); 292 293 spdk_mmio_write_2(&hw->common_cfg->queue_select, vq->vq_queue_index); 294 295 io_write64_twopart(desc_addr, &hw->common_cfg->queue_desc_lo, 296 &hw->common_cfg->queue_desc_hi); 297 io_write64_twopart(avail_addr, &hw->common_cfg->queue_avail_lo, 298 &hw->common_cfg->queue_avail_hi); 299 io_write64_twopart(used_addr, &hw->common_cfg->queue_used_lo, 300 &hw->common_cfg->queue_used_hi); 301 302 notify_off = spdk_mmio_read_2(&hw->common_cfg->queue_notify_off); 303 vq->notify_addr = (void *)((uint8_t *)hw->notify_base + 304 notify_off * hw->notify_off_multiplier); 305 306 spdk_mmio_write_2(&hw->common_cfg->queue_enable, 1); 307 308 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "queue %"PRIu16" addresses:\n", vq->vq_queue_index); 309 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "\t desc_addr: %" PRIx64 "\n", desc_addr); 310 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "\t aval_addr: %" PRIx64 "\n", avail_addr); 311 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "\t used_addr: %" PRIx64 "\n", used_addr); 312 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "\t notify addr: %p (notify offset: %"PRIu16")\n", 313 vq->notify_addr, notify_off); 314 315 return 0; 316 } 317 318 static void 319 modern_del_queue(struct virtio_dev *dev, struct virtqueue *vq) 320 { 321 struct virtio_hw *hw = dev->ctx; 322 323 spdk_mmio_write_2(&hw->common_cfg->queue_select, vq->vq_queue_index); 324 325 io_write64_twopart(0, &hw->common_cfg->queue_desc_lo, 326 &hw->common_cfg->queue_desc_hi); 327 io_write64_twopart(0, &hw->common_cfg->queue_avail_lo, 328 &hw->common_cfg->queue_avail_hi); 329 io_write64_twopart(0, &hw->common_cfg->queue_used_lo, 330 &hw->common_cfg->queue_used_hi); 331 332 spdk_mmio_write_2(&hw->common_cfg->queue_enable, 0); 333 334 spdk_dma_free(vq->vq_ring_virt_mem); 335 } 336 337 static void 338 modern_notify_queue(struct virtio_dev *dev, struct virtqueue *vq) 339 { 340 spdk_mmio_write_2(vq->notify_addr, vq->vq_queue_index); 341 } 342 343 static const struct virtio_dev_ops modern_ops = { 344 .read_dev_cfg = modern_read_dev_config, 345 .write_dev_cfg = modern_write_dev_config, 346 .get_status = modern_get_status, 347 .set_status = modern_set_status, 348 .get_features = modern_get_features, 349 .set_features = modern_set_features, 350 .destruct_dev = modern_destruct_dev, 351 .get_queue_size = modern_get_queue_size, 352 .setup_queue = modern_setup_queue, 353 .del_queue = modern_del_queue, 354 .notify_queue = modern_notify_queue, 355 .dump_json_info = pci_dump_json_info, 356 .write_json_config = pci_write_json_config, 357 }; 358 359 static void * 360 get_cfg_addr(struct virtio_hw *hw, struct virtio_pci_cap *cap) 361 { 362 uint8_t bar = cap->bar; 363 uint32_t length = cap->length; 364 uint32_t offset = cap->offset; 365 366 if (bar > 5) { 367 SPDK_ERRLOG("invalid bar: %"PRIu8"\n", bar); 368 return NULL; 369 } 370 371 if (offset + length < offset) { 372 SPDK_ERRLOG("offset(%"PRIu32") + length(%"PRIu32") overflows\n", 373 offset, length); 374 return NULL; 375 } 376 377 if (offset + length > hw->pci_bar[bar].len) { 378 SPDK_ERRLOG("invalid cap: overflows bar space: %"PRIu32" > %"PRIu32"\n", 379 offset + length, hw->pci_bar[bar].len); 380 return NULL; 381 } 382 383 if (hw->pci_bar[bar].vaddr == NULL) { 384 SPDK_ERRLOG("bar %"PRIu8" base addr is NULL\n", bar); 385 return NULL; 386 } 387 388 return hw->pci_bar[bar].vaddr + offset; 389 } 390 391 static int 392 virtio_read_caps(struct virtio_hw *hw) 393 { 394 uint8_t pos; 395 struct virtio_pci_cap cap; 396 int ret; 397 398 ret = spdk_pci_device_cfg_read(hw->pci_dev, &pos, 1, PCI_CAPABILITY_LIST); 399 if (ret < 0) { 400 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "failed to read pci capability list\n"); 401 return ret; 402 } 403 404 while (pos) { 405 ret = spdk_pci_device_cfg_read(hw->pci_dev, &cap, sizeof(cap), pos); 406 if (ret < 0) { 407 SPDK_ERRLOG("failed to read pci cap at pos: %"PRIx8"\n", pos); 408 break; 409 } 410 411 if (cap.cap_vndr == PCI_CAP_ID_MSIX) { 412 hw->use_msix = 1; 413 } 414 415 if (cap.cap_vndr != PCI_CAP_ID_VNDR) { 416 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, 417 "[%2"PRIx8"] skipping non VNDR cap id: %02"PRIx8"\n", 418 pos, cap.cap_vndr); 419 goto next; 420 } 421 422 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, 423 "[%2"PRIx8"] cfg type: %"PRIu8", bar: %"PRIu8", offset: %04"PRIx32", len: %"PRIu32"\n", 424 pos, cap.cfg_type, cap.bar, cap.offset, cap.length); 425 426 switch (cap.cfg_type) { 427 case VIRTIO_PCI_CAP_COMMON_CFG: 428 hw->common_cfg = get_cfg_addr(hw, &cap); 429 break; 430 case VIRTIO_PCI_CAP_NOTIFY_CFG: 431 spdk_pci_device_cfg_read(hw->pci_dev, &hw->notify_off_multiplier, 432 4, pos + sizeof(cap)); 433 hw->notify_base = get_cfg_addr(hw, &cap); 434 break; 435 case VIRTIO_PCI_CAP_DEVICE_CFG: 436 hw->dev_cfg = get_cfg_addr(hw, &cap); 437 break; 438 case VIRTIO_PCI_CAP_ISR_CFG: 439 hw->isr = get_cfg_addr(hw, &cap); 440 break; 441 } 442 443 next: 444 pos = cap.cap_next; 445 } 446 447 if (hw->common_cfg == NULL || hw->notify_base == NULL || 448 hw->dev_cfg == NULL || hw->isr == NULL) { 449 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "no modern virtio pci device found.\n"); 450 if (ret < 0) { 451 return ret; 452 } else { 453 return -EINVAL; 454 } 455 } 456 457 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "found modern virtio pci device.\n"); 458 459 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "common cfg mapped at: %p\n", hw->common_cfg); 460 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "device cfg mapped at: %p\n", hw->dev_cfg); 461 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "isr cfg mapped at: %p\n", hw->isr); 462 SPDK_DEBUGLOG(SPDK_LOG_VIRTIO_PCI, "notify base: %p, notify off multiplier: %u\n", 463 hw->notify_base, hw->notify_off_multiplier); 464 465 return 0; 466 } 467 468 static int 469 virtio_pci_dev_probe(struct spdk_pci_device *pci_dev, struct virtio_pci_probe_ctx *ctx) 470 { 471 struct virtio_hw *hw; 472 uint8_t *bar_vaddr; 473 uint64_t bar_paddr, bar_len; 474 int rc; 475 unsigned i; 476 char bdf[32]; 477 struct spdk_pci_addr addr; 478 479 addr = spdk_pci_device_get_addr(pci_dev); 480 rc = spdk_pci_addr_fmt(bdf, sizeof(bdf), &addr); 481 if (rc != 0) { 482 SPDK_ERRLOG("Ignoring a device with non-parseable PCI address\n"); 483 return -1; 484 } 485 486 hw = calloc(1, sizeof(*hw)); 487 if (hw == NULL) { 488 SPDK_ERRLOG("%s: calloc failed\n", bdf); 489 return -1; 490 } 491 492 hw->pci_dev = pci_dev; 493 494 for (i = 0; i < 6; ++i) { 495 rc = spdk_pci_device_map_bar(pci_dev, i, (void *) &bar_vaddr, &bar_paddr, 496 &bar_len); 497 if (rc != 0) { 498 SPDK_ERRLOG("%s: failed to memmap PCI BAR %u\n", bdf, i); 499 free_virtio_hw(hw); 500 return -1; 501 } 502 503 hw->pci_bar[i].vaddr = bar_vaddr; 504 hw->pci_bar[i].len = bar_len; 505 } 506 507 /* Virtio PCI caps exist only on modern PCI devices. 508 * Legacy devices are not supported. 509 */ 510 if (virtio_read_caps(hw) != 0) { 511 SPDK_NOTICELOG("Ignoring legacy PCI device at %s\n", bdf); 512 free_virtio_hw(hw); 513 return -1; 514 } 515 516 rc = ctx->enum_cb((struct virtio_pci_ctx *)hw, ctx->enum_ctx); 517 if (rc != 0) { 518 free_virtio_hw(hw); 519 } 520 521 return rc; 522 } 523 524 static int 525 virtio_pci_dev_probe_cb(void *probe_ctx, struct spdk_pci_device *pci_dev) 526 { 527 struct virtio_pci_probe_ctx *ctx = probe_ctx; 528 uint16_t pci_device_id = spdk_pci_device_get_device_id(pci_dev); 529 530 if (pci_device_id != ctx->device_id) { 531 return 1; 532 } 533 534 return virtio_pci_dev_probe(pci_dev, ctx); 535 } 536 537 int 538 virtio_pci_dev_enumerate(virtio_pci_create_cb enum_cb, void *enum_ctx, 539 uint16_t pci_device_id) 540 { 541 struct virtio_pci_probe_ctx ctx; 542 543 if (!spdk_process_is_primary()) { 544 SPDK_WARNLOG("virtio_pci secondary process support is not implemented yet.\n"); 545 return 0; 546 } 547 548 ctx.enum_cb = enum_cb; 549 ctx.enum_ctx = enum_ctx; 550 ctx.device_id = pci_device_id; 551 552 return spdk_pci_enumerate(spdk_pci_virtio_get_driver(), 553 virtio_pci_dev_probe_cb, &ctx); 554 } 555 556 int 557 virtio_pci_dev_attach(virtio_pci_create_cb enum_cb, void *enum_ctx, 558 uint16_t pci_device_id, struct spdk_pci_addr *pci_address) 559 { 560 struct virtio_pci_probe_ctx ctx; 561 562 if (!spdk_process_is_primary()) { 563 SPDK_WARNLOG("virtio_pci secondary process support is not implemented yet.\n"); 564 return 0; 565 } 566 567 ctx.enum_cb = enum_cb; 568 ctx.enum_ctx = enum_ctx; 569 ctx.device_id = pci_device_id; 570 571 return spdk_pci_device_attach(spdk_pci_virtio_get_driver(), 572 virtio_pci_dev_probe_cb, &ctx, pci_address); 573 } 574 575 int 576 virtio_pci_dev_init(struct virtio_dev *vdev, const char *name, 577 struct virtio_pci_ctx *pci_ctx) 578 { 579 int rc; 580 581 rc = virtio_dev_construct(vdev, name, &modern_ops, pci_ctx); 582 if (rc != 0) { 583 return rc; 584 } 585 586 vdev->is_hw = 1; 587 vdev->modern = 1; 588 589 return 0; 590 } 591 592 SPDK_LOG_REGISTER_COMPONENT("virtio_pci", SPDK_LOG_VIRTIO_PCI) 593