1 /* 2 * Linux driver for VMware's para-virtualized SCSI HBA. 3 * 4 * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; version 2 of the License and no later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 13 * NON INFRINGEMENT. See the GNU General Public License for more 14 * details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Maintained by: Arvind Kumar <arvindkumar@vmware.com> 21 * 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/interrupt.h> 27 #include <linux/slab.h> 28 #include <linux/workqueue.h> 29 #include <linux/pci.h> 30 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_host.h> 33 #include <scsi/scsi_cmnd.h> 34 #include <scsi/scsi_device.h> 35 #include <scsi/scsi_tcq.h> 36 37 #include "vmw_pvscsi.h" 38 39 #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" 40 41 MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); 42 MODULE_AUTHOR("VMware, Inc."); 43 MODULE_LICENSE("GPL"); 44 MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); 45 46 #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 47 #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 48 #define PVSCSI_DEFAULT_QUEUE_DEPTH 254 49 #define SGL_SIZE PAGE_SIZE 50 51 struct pvscsi_sg_list { 52 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; 53 }; 54 55 struct pvscsi_ctx { 56 /* 57 * The index of the context in cmd_map serves as the context ID for a 58 * 1-to-1 mapping completions back to requests. 59 */ 60 struct scsi_cmnd *cmd; 61 struct pvscsi_sg_list *sgl; 62 struct list_head list; 63 dma_addr_t dataPA; 64 dma_addr_t sensePA; 65 dma_addr_t sglPA; 66 struct completion *abort_cmp; 67 }; 68 69 struct pvscsi_adapter { 70 char *mmioBase; 71 unsigned int irq; 72 u8 rev; 73 bool use_msi; 74 bool use_msix; 75 bool use_msg; 76 bool use_req_threshold; 77 78 spinlock_t hw_lock; 79 80 struct workqueue_struct *workqueue; 81 struct work_struct work; 82 83 struct PVSCSIRingReqDesc *req_ring; 84 unsigned req_pages; 85 unsigned req_depth; 86 dma_addr_t reqRingPA; 87 88 struct PVSCSIRingCmpDesc *cmp_ring; 89 unsigned cmp_pages; 90 dma_addr_t cmpRingPA; 91 92 struct PVSCSIRingMsgDesc *msg_ring; 93 unsigned msg_pages; 94 dma_addr_t msgRingPA; 95 96 struct PVSCSIRingsState *rings_state; 97 dma_addr_t ringStatePA; 98 99 struct pci_dev *dev; 100 struct Scsi_Host *host; 101 102 struct list_head cmd_pool; 103 struct pvscsi_ctx *cmd_map; 104 }; 105 106 107 /* Command line parameters */ 108 static int pvscsi_ring_pages; 109 static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; 110 static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; 111 static bool pvscsi_disable_msi; 112 static bool pvscsi_disable_msix; 113 static bool pvscsi_use_msg = true; 114 static bool pvscsi_use_req_threshold = true; 115 116 #define PVSCSI_RW (S_IRUSR | S_IWUSR) 117 118 module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); 119 MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" 120 __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) 121 "[up to 16 targets]," 122 __stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) 123 "[for 16+ targets])"); 124 125 module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); 126 MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" 127 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); 128 129 module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); 130 MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" 131 __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")"); 132 133 module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); 134 MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); 135 136 module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); 137 MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); 138 139 module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); 140 MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); 141 142 module_param_named(use_req_threshold, pvscsi_use_req_threshold, 143 bool, PVSCSI_RW); 144 MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)"); 145 146 static const struct pci_device_id pvscsi_pci_tbl[] = { 147 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, 148 { 0 } 149 }; 150 151 MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); 152 153 static struct device * 154 pvscsi_dev(const struct pvscsi_adapter *adapter) 155 { 156 return &(adapter->dev->dev); 157 } 158 159 static struct pvscsi_ctx * 160 pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) 161 { 162 struct pvscsi_ctx *ctx, *end; 163 164 end = &adapter->cmd_map[adapter->req_depth]; 165 for (ctx = adapter->cmd_map; ctx < end; ctx++) 166 if (ctx->cmd == cmd) 167 return ctx; 168 169 return NULL; 170 } 171 172 static struct pvscsi_ctx * 173 pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) 174 { 175 struct pvscsi_ctx *ctx; 176 177 if (list_empty(&adapter->cmd_pool)) 178 return NULL; 179 180 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); 181 ctx->cmd = cmd; 182 list_del(&ctx->list); 183 184 return ctx; 185 } 186 187 static void pvscsi_release_context(struct pvscsi_adapter *adapter, 188 struct pvscsi_ctx *ctx) 189 { 190 ctx->cmd = NULL; 191 ctx->abort_cmp = NULL; 192 list_add(&ctx->list, &adapter->cmd_pool); 193 } 194 195 /* 196 * Map a pvscsi_ctx struct to a context ID field value; we map to a simple 197 * non-zero integer. ctx always points to an entry in cmd_map array, hence 198 * the return value is always >=1. 199 */ 200 static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, 201 const struct pvscsi_ctx *ctx) 202 { 203 return ctx - adapter->cmd_map + 1; 204 } 205 206 static struct pvscsi_ctx * 207 pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) 208 { 209 return &adapter->cmd_map[context - 1]; 210 } 211 212 static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, 213 u32 offset, u32 val) 214 { 215 writel(val, adapter->mmioBase + offset); 216 } 217 218 static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) 219 { 220 return readl(adapter->mmioBase + offset); 221 } 222 223 static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) 224 { 225 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); 226 } 227 228 static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, 229 u32 val) 230 { 231 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); 232 } 233 234 static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) 235 { 236 u32 intr_bits; 237 238 intr_bits = PVSCSI_INTR_CMPL_MASK; 239 if (adapter->use_msg) 240 intr_bits |= PVSCSI_INTR_MSG_MASK; 241 242 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); 243 } 244 245 static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) 246 { 247 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); 248 } 249 250 static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, 251 u32 cmd, const void *desc, size_t len) 252 { 253 const u32 *ptr = desc; 254 size_t i; 255 256 len /= sizeof(*ptr); 257 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); 258 for (i = 0; i < len; i++) 259 pvscsi_reg_write(adapter, 260 PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); 261 } 262 263 static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, 264 const struct pvscsi_ctx *ctx) 265 { 266 struct PVSCSICmdDescAbortCmd cmd = { 0 }; 267 268 cmd.target = ctx->cmd->device->id; 269 cmd.context = pvscsi_map_context(adapter, ctx); 270 271 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); 272 } 273 274 static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) 275 { 276 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); 277 } 278 279 static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) 280 { 281 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); 282 } 283 284 static int scsi_is_rw(unsigned char op) 285 { 286 return op == READ_6 || op == WRITE_6 || 287 op == READ_10 || op == WRITE_10 || 288 op == READ_12 || op == WRITE_12 || 289 op == READ_16 || op == WRITE_16; 290 } 291 292 static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, 293 unsigned char op) 294 { 295 if (scsi_is_rw(op)) { 296 struct PVSCSIRingsState *s = adapter->rings_state; 297 298 if (!adapter->use_req_threshold || 299 s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) 300 pvscsi_kick_rw_io(adapter); 301 } else { 302 pvscsi_process_request_ring(adapter); 303 } 304 } 305 306 static void ll_adapter_reset(const struct pvscsi_adapter *adapter) 307 { 308 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); 309 310 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); 311 } 312 313 static void ll_bus_reset(const struct pvscsi_adapter *adapter) 314 { 315 dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter); 316 317 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); 318 } 319 320 static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) 321 { 322 struct PVSCSICmdDescResetDevice cmd = { 0 }; 323 324 dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target); 325 326 cmd.target = target; 327 328 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, 329 &cmd, sizeof(cmd)); 330 } 331 332 static void pvscsi_create_sg(struct pvscsi_ctx *ctx, 333 struct scatterlist *sg, unsigned count) 334 { 335 unsigned i; 336 struct PVSCSISGElement *sge; 337 338 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); 339 340 sge = &ctx->sgl->sge[0]; 341 for (i = 0; i < count; i++, sg++) { 342 sge[i].addr = sg_dma_address(sg); 343 sge[i].length = sg_dma_len(sg); 344 sge[i].flags = 0; 345 } 346 } 347 348 /* 349 * Map all data buffers for a command into PCI space and 350 * setup the scatter/gather list if needed. 351 */ 352 static void pvscsi_map_buffers(struct pvscsi_adapter *adapter, 353 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, 354 struct PVSCSIRingReqDesc *e) 355 { 356 unsigned count; 357 unsigned bufflen = scsi_bufflen(cmd); 358 struct scatterlist *sg; 359 360 e->dataLen = bufflen; 361 e->dataAddr = 0; 362 if (bufflen == 0) 363 return; 364 365 sg = scsi_sglist(cmd); 366 count = scsi_sg_count(cmd); 367 if (count != 0) { 368 int segs = scsi_dma_map(cmd); 369 if (segs > 1) { 370 pvscsi_create_sg(ctx, sg, segs); 371 372 e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; 373 ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl, 374 SGL_SIZE, PCI_DMA_TODEVICE); 375 e->dataAddr = ctx->sglPA; 376 } else 377 e->dataAddr = sg_dma_address(sg); 378 } else { 379 /* 380 * In case there is no S/G list, scsi_sglist points 381 * directly to the buffer. 382 */ 383 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen, 384 cmd->sc_data_direction); 385 e->dataAddr = ctx->dataPA; 386 } 387 } 388 389 static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, 390 struct pvscsi_ctx *ctx) 391 { 392 struct scsi_cmnd *cmd; 393 unsigned bufflen; 394 395 cmd = ctx->cmd; 396 bufflen = scsi_bufflen(cmd); 397 398 if (bufflen != 0) { 399 unsigned count = scsi_sg_count(cmd); 400 401 if (count != 0) { 402 scsi_dma_unmap(cmd); 403 if (ctx->sglPA) { 404 pci_unmap_single(adapter->dev, ctx->sglPA, 405 SGL_SIZE, PCI_DMA_TODEVICE); 406 ctx->sglPA = 0; 407 } 408 } else 409 pci_unmap_single(adapter->dev, ctx->dataPA, bufflen, 410 cmd->sc_data_direction); 411 } 412 if (cmd->sense_buffer) 413 pci_unmap_single(adapter->dev, ctx->sensePA, 414 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); 415 } 416 417 static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) 418 { 419 adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE, 420 &adapter->ringStatePA); 421 if (!adapter->rings_state) 422 return -ENOMEM; 423 424 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, 425 pvscsi_ring_pages); 426 adapter->req_depth = adapter->req_pages 427 * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; 428 adapter->req_ring = pci_alloc_consistent(adapter->dev, 429 adapter->req_pages * PAGE_SIZE, 430 &adapter->reqRingPA); 431 if (!adapter->req_ring) 432 return -ENOMEM; 433 434 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, 435 pvscsi_ring_pages); 436 adapter->cmp_ring = pci_alloc_consistent(adapter->dev, 437 adapter->cmp_pages * PAGE_SIZE, 438 &adapter->cmpRingPA); 439 if (!adapter->cmp_ring) 440 return -ENOMEM; 441 442 BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); 443 BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); 444 BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); 445 446 if (!adapter->use_msg) 447 return 0; 448 449 adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, 450 pvscsi_msg_ring_pages); 451 adapter->msg_ring = pci_alloc_consistent(adapter->dev, 452 adapter->msg_pages * PAGE_SIZE, 453 &adapter->msgRingPA); 454 if (!adapter->msg_ring) 455 return -ENOMEM; 456 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); 457 458 return 0; 459 } 460 461 static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) 462 { 463 struct PVSCSICmdDescSetupRings cmd = { 0 }; 464 dma_addr_t base; 465 unsigned i; 466 467 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; 468 cmd.reqRingNumPages = adapter->req_pages; 469 cmd.cmpRingNumPages = adapter->cmp_pages; 470 471 base = adapter->reqRingPA; 472 for (i = 0; i < adapter->req_pages; i++) { 473 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; 474 base += PAGE_SIZE; 475 } 476 477 base = adapter->cmpRingPA; 478 for (i = 0; i < adapter->cmp_pages; i++) { 479 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; 480 base += PAGE_SIZE; 481 } 482 483 memset(adapter->rings_state, 0, PAGE_SIZE); 484 memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); 485 memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); 486 487 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, 488 &cmd, sizeof(cmd)); 489 490 if (adapter->use_msg) { 491 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; 492 493 cmd_msg.numPages = adapter->msg_pages; 494 495 base = adapter->msgRingPA; 496 for (i = 0; i < adapter->msg_pages; i++) { 497 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; 498 base += PAGE_SIZE; 499 } 500 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); 501 502 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, 503 &cmd_msg, sizeof(cmd_msg)); 504 } 505 } 506 507 static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) 508 { 509 if (!sdev->tagged_supported) 510 qdepth = 1; 511 return scsi_change_queue_depth(sdev, qdepth); 512 } 513 514 /* 515 * Pull a completion descriptor off and pass the completion back 516 * to the SCSI mid layer. 517 */ 518 static void pvscsi_complete_request(struct pvscsi_adapter *adapter, 519 const struct PVSCSIRingCmpDesc *e) 520 { 521 struct pvscsi_ctx *ctx; 522 struct scsi_cmnd *cmd; 523 struct completion *abort_cmp; 524 u32 btstat = e->hostStatus; 525 u32 sdstat = e->scsiStatus; 526 527 ctx = pvscsi_get_context(adapter, e->context); 528 cmd = ctx->cmd; 529 abort_cmp = ctx->abort_cmp; 530 pvscsi_unmap_buffers(adapter, ctx); 531 pvscsi_release_context(adapter, ctx); 532 if (abort_cmp) { 533 /* 534 * The command was requested to be aborted. Just signal that 535 * the request completed and swallow the actual cmd completion 536 * here. The abort handler will post a completion for this 537 * command indicating that it got successfully aborted. 538 */ 539 complete(abort_cmp); 540 return; 541 } 542 543 cmd->result = 0; 544 if (sdstat != SAM_STAT_GOOD && 545 (btstat == BTSTAT_SUCCESS || 546 btstat == BTSTAT_LINKED_COMMAND_COMPLETED || 547 btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { 548 cmd->result = (DID_OK << 16) | sdstat; 549 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer) 550 cmd->result |= (DRIVER_SENSE << 24); 551 } else 552 switch (btstat) { 553 case BTSTAT_SUCCESS: 554 case BTSTAT_LINKED_COMMAND_COMPLETED: 555 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: 556 /* If everything went fine, let's move on.. */ 557 cmd->result = (DID_OK << 16); 558 break; 559 560 case BTSTAT_DATARUN: 561 case BTSTAT_DATA_UNDERRUN: 562 /* Report residual data in underruns */ 563 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); 564 cmd->result = (DID_ERROR << 16); 565 break; 566 567 case BTSTAT_SELTIMEO: 568 /* Our emulation returns this for non-connected devs */ 569 cmd->result = (DID_BAD_TARGET << 16); 570 break; 571 572 case BTSTAT_LUNMISMATCH: 573 case BTSTAT_TAGREJECT: 574 case BTSTAT_BADMSG: 575 cmd->result = (DRIVER_INVALID << 24); 576 /* fall through */ 577 578 case BTSTAT_HAHARDWARE: 579 case BTSTAT_INVPHASE: 580 case BTSTAT_HATIMEOUT: 581 case BTSTAT_NORESPONSE: 582 case BTSTAT_DISCONNECT: 583 case BTSTAT_HASOFTWARE: 584 case BTSTAT_BUSFREE: 585 case BTSTAT_SENSFAILED: 586 cmd->result |= (DID_ERROR << 16); 587 break; 588 589 case BTSTAT_SENTRST: 590 case BTSTAT_RECVRST: 591 case BTSTAT_BUSRESET: 592 cmd->result = (DID_RESET << 16); 593 break; 594 595 case BTSTAT_ABORTQUEUE: 596 cmd->result = (DID_ABORT << 16); 597 break; 598 599 case BTSTAT_SCSIPARITY: 600 cmd->result = (DID_PARITY << 16); 601 break; 602 603 default: 604 cmd->result = (DID_ERROR << 16); 605 scmd_printk(KERN_DEBUG, cmd, 606 "Unknown completion status: 0x%x\n", 607 btstat); 608 } 609 610 dev_dbg(&cmd->device->sdev_gendev, 611 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", 612 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); 613 614 cmd->scsi_done(cmd); 615 } 616 617 /* 618 * barrier usage : Since the PVSCSI device is emulated, there could be cases 619 * where we may want to serialize some accesses between the driver and the 620 * emulation layer. We use compiler barriers instead of the more expensive 621 * memory barriers because PVSCSI is only supported on X86 which has strong 622 * memory access ordering. 623 */ 624 static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) 625 { 626 struct PVSCSIRingsState *s = adapter->rings_state; 627 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; 628 u32 cmp_entries = s->cmpNumEntriesLog2; 629 630 while (s->cmpConsIdx != s->cmpProdIdx) { 631 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & 632 MASK(cmp_entries)); 633 /* 634 * This barrier() ensures that *e is not dereferenced while 635 * the device emulation still writes data into the slot. 636 * Since the device emulation advances s->cmpProdIdx only after 637 * updating the slot we want to check it first. 638 */ 639 barrier(); 640 pvscsi_complete_request(adapter, e); 641 /* 642 * This barrier() ensures that compiler doesn't reorder write 643 * to s->cmpConsIdx before the read of (*e) inside 644 * pvscsi_complete_request. Otherwise, device emulation may 645 * overwrite *e before we had a chance to read it. 646 */ 647 barrier(); 648 s->cmpConsIdx++; 649 } 650 } 651 652 /* 653 * Translate a Linux SCSI request into a request ring entry. 654 */ 655 static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, 656 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) 657 { 658 struct PVSCSIRingsState *s; 659 struct PVSCSIRingReqDesc *e; 660 struct scsi_device *sdev; 661 u32 req_entries; 662 663 s = adapter->rings_state; 664 sdev = cmd->device; 665 req_entries = s->reqNumEntriesLog2; 666 667 /* 668 * If this condition holds, we might have room on the request ring, but 669 * we might not have room on the completion ring for the response. 670 * However, we have already ruled out this possibility - we would not 671 * have successfully allocated a context if it were true, since we only 672 * have one context per request entry. Check for it anyway, since it 673 * would be a serious bug. 674 */ 675 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { 676 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " 677 "ring full: reqProdIdx=%d cmpConsIdx=%d\n", 678 s->reqProdIdx, s->cmpConsIdx); 679 return -1; 680 } 681 682 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); 683 684 e->bus = sdev->channel; 685 e->target = sdev->id; 686 memset(e->lun, 0, sizeof(e->lun)); 687 e->lun[1] = sdev->lun; 688 689 if (cmd->sense_buffer) { 690 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer, 691 SCSI_SENSE_BUFFERSIZE, 692 PCI_DMA_FROMDEVICE); 693 e->senseAddr = ctx->sensePA; 694 e->senseLen = SCSI_SENSE_BUFFERSIZE; 695 } else { 696 e->senseLen = 0; 697 e->senseAddr = 0; 698 } 699 e->cdbLen = cmd->cmd_len; 700 e->vcpuHint = smp_processor_id(); 701 memcpy(e->cdb, cmd->cmnd, e->cdbLen); 702 703 e->tag = SIMPLE_QUEUE_TAG; 704 705 if (cmd->sc_data_direction == DMA_FROM_DEVICE) 706 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; 707 else if (cmd->sc_data_direction == DMA_TO_DEVICE) 708 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; 709 else if (cmd->sc_data_direction == DMA_NONE) 710 e->flags = PVSCSI_FLAG_CMD_DIR_NONE; 711 else 712 e->flags = 0; 713 714 pvscsi_map_buffers(adapter, ctx, cmd, e); 715 716 e->context = pvscsi_map_context(adapter, ctx); 717 718 barrier(); 719 720 s->reqProdIdx++; 721 722 return 0; 723 } 724 725 static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 726 { 727 struct Scsi_Host *host = cmd->device->host; 728 struct pvscsi_adapter *adapter = shost_priv(host); 729 struct pvscsi_ctx *ctx; 730 unsigned long flags; 731 732 spin_lock_irqsave(&adapter->hw_lock, flags); 733 734 ctx = pvscsi_acquire_context(adapter, cmd); 735 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { 736 if (ctx) 737 pvscsi_release_context(adapter, ctx); 738 spin_unlock_irqrestore(&adapter->hw_lock, flags); 739 return SCSI_MLQUEUE_HOST_BUSY; 740 } 741 742 cmd->scsi_done = done; 743 744 dev_dbg(&cmd->device->sdev_gendev, 745 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]); 746 747 spin_unlock_irqrestore(&adapter->hw_lock, flags); 748 749 pvscsi_kick_io(adapter, cmd->cmnd[0]); 750 751 return 0; 752 } 753 754 static DEF_SCSI_QCMD(pvscsi_queue) 755 756 static int pvscsi_abort(struct scsi_cmnd *cmd) 757 { 758 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); 759 struct pvscsi_ctx *ctx; 760 unsigned long flags; 761 int result = SUCCESS; 762 DECLARE_COMPLETION_ONSTACK(abort_cmp); 763 764 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", 765 adapter->host->host_no, cmd); 766 767 spin_lock_irqsave(&adapter->hw_lock, flags); 768 769 /* 770 * Poll the completion ring first - we might be trying to abort 771 * a command that is waiting to be dispatched in the completion ring. 772 */ 773 pvscsi_process_completion_ring(adapter); 774 775 /* 776 * If there is no context for the command, it either already succeeded 777 * or else was never properly issued. Not our problem. 778 */ 779 ctx = pvscsi_find_context(adapter, cmd); 780 if (!ctx) { 781 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); 782 goto out; 783 } 784 785 /* 786 * Mark that the command has been requested to be aborted and issue 787 * the abort. 788 */ 789 ctx->abort_cmp = &abort_cmp; 790 791 pvscsi_abort_cmd(adapter, ctx); 792 spin_unlock_irqrestore(&adapter->hw_lock, flags); 793 /* Wait for 2 secs for the completion. */ 794 wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000)); 795 spin_lock_irqsave(&adapter->hw_lock, flags); 796 797 if (!completion_done(&abort_cmp)) { 798 /* 799 * Failed to abort the command, unmark the fact that it 800 * was requested to be aborted. 801 */ 802 ctx->abort_cmp = NULL; 803 result = FAILED; 804 scmd_printk(KERN_DEBUG, cmd, 805 "Failed to get completion for aborted cmd %p\n", 806 cmd); 807 goto out; 808 } 809 810 /* 811 * Successfully aborted the command. 812 */ 813 cmd->result = (DID_ABORT << 16); 814 cmd->scsi_done(cmd); 815 816 out: 817 spin_unlock_irqrestore(&adapter->hw_lock, flags); 818 return result; 819 } 820 821 /* 822 * Abort all outstanding requests. This is only safe to use if the completion 823 * ring will never be walked again or the device has been reset, because it 824 * destroys the 1-1 mapping between context field passed to emulation and our 825 * request structure. 826 */ 827 static void pvscsi_reset_all(struct pvscsi_adapter *adapter) 828 { 829 unsigned i; 830 831 for (i = 0; i < adapter->req_depth; i++) { 832 struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; 833 struct scsi_cmnd *cmd = ctx->cmd; 834 if (cmd) { 835 scmd_printk(KERN_ERR, cmd, 836 "Forced reset on cmd %p\n", cmd); 837 pvscsi_unmap_buffers(adapter, ctx); 838 pvscsi_release_context(adapter, ctx); 839 cmd->result = (DID_RESET << 16); 840 cmd->scsi_done(cmd); 841 } 842 } 843 } 844 845 static int pvscsi_host_reset(struct scsi_cmnd *cmd) 846 { 847 struct Scsi_Host *host = cmd->device->host; 848 struct pvscsi_adapter *adapter = shost_priv(host); 849 unsigned long flags; 850 bool use_msg; 851 852 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); 853 854 spin_lock_irqsave(&adapter->hw_lock, flags); 855 856 use_msg = adapter->use_msg; 857 858 if (use_msg) { 859 adapter->use_msg = 0; 860 spin_unlock_irqrestore(&adapter->hw_lock, flags); 861 862 /* 863 * Now that we know that the ISR won't add more work on the 864 * workqueue we can safely flush any outstanding work. 865 */ 866 flush_workqueue(adapter->workqueue); 867 spin_lock_irqsave(&adapter->hw_lock, flags); 868 } 869 870 /* 871 * We're going to tear down the entire ring structure and set it back 872 * up, so stalling new requests until all completions are flushed and 873 * the rings are back in place. 874 */ 875 876 pvscsi_process_request_ring(adapter); 877 878 ll_adapter_reset(adapter); 879 880 /* 881 * Now process any completions. Note we do this AFTER adapter reset, 882 * which is strange, but stops races where completions get posted 883 * between processing the ring and issuing the reset. The backend will 884 * not touch the ring memory after reset, so the immediately pre-reset 885 * completion ring state is still valid. 886 */ 887 pvscsi_process_completion_ring(adapter); 888 889 pvscsi_reset_all(adapter); 890 adapter->use_msg = use_msg; 891 pvscsi_setup_all_rings(adapter); 892 pvscsi_unmask_intr(adapter); 893 894 spin_unlock_irqrestore(&adapter->hw_lock, flags); 895 896 return SUCCESS; 897 } 898 899 static int pvscsi_bus_reset(struct scsi_cmnd *cmd) 900 { 901 struct Scsi_Host *host = cmd->device->host; 902 struct pvscsi_adapter *adapter = shost_priv(host); 903 unsigned long flags; 904 905 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); 906 907 /* 908 * We don't want to queue new requests for this bus after 909 * flushing all pending requests to emulation, since new 910 * requests could then sneak in during this bus reset phase, 911 * so take the lock now. 912 */ 913 spin_lock_irqsave(&adapter->hw_lock, flags); 914 915 pvscsi_process_request_ring(adapter); 916 ll_bus_reset(adapter); 917 pvscsi_process_completion_ring(adapter); 918 919 spin_unlock_irqrestore(&adapter->hw_lock, flags); 920 921 return SUCCESS; 922 } 923 924 static int pvscsi_device_reset(struct scsi_cmnd *cmd) 925 { 926 struct Scsi_Host *host = cmd->device->host; 927 struct pvscsi_adapter *adapter = shost_priv(host); 928 unsigned long flags; 929 930 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", 931 host->host_no, cmd->device->id); 932 933 /* 934 * We don't want to queue new requests for this device after flushing 935 * all pending requests to emulation, since new requests could then 936 * sneak in during this device reset phase, so take the lock now. 937 */ 938 spin_lock_irqsave(&adapter->hw_lock, flags); 939 940 pvscsi_process_request_ring(adapter); 941 ll_device_reset(adapter, cmd->device->id); 942 pvscsi_process_completion_ring(adapter); 943 944 spin_unlock_irqrestore(&adapter->hw_lock, flags); 945 946 return SUCCESS; 947 } 948 949 static struct scsi_host_template pvscsi_template; 950 951 static const char *pvscsi_info(struct Scsi_Host *host) 952 { 953 struct pvscsi_adapter *adapter = shost_priv(host); 954 static char buf[256]; 955 956 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " 957 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, 958 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, 959 pvscsi_template.cmd_per_lun); 960 961 return buf; 962 } 963 964 static struct scsi_host_template pvscsi_template = { 965 .module = THIS_MODULE, 966 .name = "VMware PVSCSI Host Adapter", 967 .proc_name = "vmw_pvscsi", 968 .info = pvscsi_info, 969 .queuecommand = pvscsi_queue, 970 .this_id = -1, 971 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, 972 .dma_boundary = UINT_MAX, 973 .max_sectors = 0xffff, 974 .use_clustering = ENABLE_CLUSTERING, 975 .change_queue_depth = pvscsi_change_queue_depth, 976 .eh_abort_handler = pvscsi_abort, 977 .eh_device_reset_handler = pvscsi_device_reset, 978 .eh_bus_reset_handler = pvscsi_bus_reset, 979 .eh_host_reset_handler = pvscsi_host_reset, 980 }; 981 982 static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, 983 const struct PVSCSIRingMsgDesc *e) 984 { 985 struct PVSCSIRingsState *s = adapter->rings_state; 986 struct Scsi_Host *host = adapter->host; 987 struct scsi_device *sdev; 988 989 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", 990 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); 991 992 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); 993 994 if (e->type == PVSCSI_MSG_DEV_ADDED) { 995 struct PVSCSIMsgDescDevStatusChanged *desc; 996 desc = (struct PVSCSIMsgDescDevStatusChanged *)e; 997 998 printk(KERN_INFO 999 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", 1000 desc->bus, desc->target, desc->lun[1]); 1001 1002 if (!scsi_host_get(host)) 1003 return; 1004 1005 sdev = scsi_device_lookup(host, desc->bus, desc->target, 1006 desc->lun[1]); 1007 if (sdev) { 1008 printk(KERN_INFO "vmw_pvscsi: device already exists\n"); 1009 scsi_device_put(sdev); 1010 } else 1011 scsi_add_device(adapter->host, desc->bus, 1012 desc->target, desc->lun[1]); 1013 1014 scsi_host_put(host); 1015 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { 1016 struct PVSCSIMsgDescDevStatusChanged *desc; 1017 desc = (struct PVSCSIMsgDescDevStatusChanged *)e; 1018 1019 printk(KERN_INFO 1020 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", 1021 desc->bus, desc->target, desc->lun[1]); 1022 1023 if (!scsi_host_get(host)) 1024 return; 1025 1026 sdev = scsi_device_lookup(host, desc->bus, desc->target, 1027 desc->lun[1]); 1028 if (sdev) { 1029 scsi_remove_device(sdev); 1030 scsi_device_put(sdev); 1031 } else 1032 printk(KERN_INFO 1033 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", 1034 desc->bus, desc->target, desc->lun[1]); 1035 1036 scsi_host_put(host); 1037 } 1038 } 1039 1040 static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) 1041 { 1042 struct PVSCSIRingsState *s = adapter->rings_state; 1043 1044 return s->msgProdIdx != s->msgConsIdx; 1045 } 1046 1047 static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) 1048 { 1049 struct PVSCSIRingsState *s = adapter->rings_state; 1050 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; 1051 u32 msg_entries = s->msgNumEntriesLog2; 1052 1053 while (pvscsi_msg_pending(adapter)) { 1054 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & 1055 MASK(msg_entries)); 1056 1057 barrier(); 1058 pvscsi_process_msg(adapter, e); 1059 barrier(); 1060 s->msgConsIdx++; 1061 } 1062 } 1063 1064 static void pvscsi_msg_workqueue_handler(struct work_struct *data) 1065 { 1066 struct pvscsi_adapter *adapter; 1067 1068 adapter = container_of(data, struct pvscsi_adapter, work); 1069 1070 pvscsi_process_msg_ring(adapter); 1071 } 1072 1073 static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) 1074 { 1075 char name[32]; 1076 1077 if (!pvscsi_use_msg) 1078 return 0; 1079 1080 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, 1081 PVSCSI_CMD_SETUP_MSG_RING); 1082 1083 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) 1084 return 0; 1085 1086 snprintf(name, sizeof(name), 1087 "vmw_pvscsi_wq_%u", adapter->host->host_no); 1088 1089 adapter->workqueue = create_singlethread_workqueue(name); 1090 if (!adapter->workqueue) { 1091 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); 1092 return 0; 1093 } 1094 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); 1095 1096 return 1; 1097 } 1098 1099 static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, 1100 bool enable) 1101 { 1102 u32 val; 1103 1104 if (!pvscsi_use_req_threshold) 1105 return false; 1106 1107 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, 1108 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); 1109 val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS); 1110 if (val == -1) { 1111 printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n"); 1112 return false; 1113 } else { 1114 struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; 1115 cmd_msg.enable = enable; 1116 printk(KERN_INFO 1117 "vmw_pvscsi: %sabling reqCallThreshold\n", 1118 enable ? "en" : "dis"); 1119 pvscsi_write_cmd_desc(adapter, 1120 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, 1121 &cmd_msg, sizeof(cmd_msg)); 1122 return pvscsi_reg_read(adapter, 1123 PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; 1124 } 1125 } 1126 1127 static irqreturn_t pvscsi_isr(int irq, void *devp) 1128 { 1129 struct pvscsi_adapter *adapter = devp; 1130 int handled; 1131 1132 if (adapter->use_msi || adapter->use_msix) 1133 handled = true; 1134 else { 1135 u32 val = pvscsi_read_intr_status(adapter); 1136 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0; 1137 if (handled) 1138 pvscsi_write_intr_status(devp, val); 1139 } 1140 1141 if (handled) { 1142 unsigned long flags; 1143 1144 spin_lock_irqsave(&adapter->hw_lock, flags); 1145 1146 pvscsi_process_completion_ring(adapter); 1147 if (adapter->use_msg && pvscsi_msg_pending(adapter)) 1148 queue_work(adapter->workqueue, &adapter->work); 1149 1150 spin_unlock_irqrestore(&adapter->hw_lock, flags); 1151 } 1152 1153 return IRQ_RETVAL(handled); 1154 } 1155 1156 static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) 1157 { 1158 struct pvscsi_ctx *ctx = adapter->cmd_map; 1159 unsigned i; 1160 1161 for (i = 0; i < adapter->req_depth; ++i, ++ctx) 1162 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); 1163 } 1164 1165 static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, 1166 unsigned int *irq) 1167 { 1168 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION }; 1169 int ret; 1170 1171 ret = pci_enable_msix_exact(adapter->dev, &entry, 1); 1172 if (ret) 1173 return ret; 1174 1175 *irq = entry.vector; 1176 1177 return 0; 1178 } 1179 1180 static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) 1181 { 1182 if (adapter->irq) { 1183 free_irq(adapter->irq, adapter); 1184 adapter->irq = 0; 1185 } 1186 if (adapter->use_msi) { 1187 pci_disable_msi(adapter->dev); 1188 adapter->use_msi = 0; 1189 } else if (adapter->use_msix) { 1190 pci_disable_msix(adapter->dev); 1191 adapter->use_msix = 0; 1192 } 1193 } 1194 1195 static void pvscsi_release_resources(struct pvscsi_adapter *adapter) 1196 { 1197 pvscsi_shutdown_intr(adapter); 1198 1199 if (adapter->workqueue) 1200 destroy_workqueue(adapter->workqueue); 1201 1202 if (adapter->mmioBase) 1203 pci_iounmap(adapter->dev, adapter->mmioBase); 1204 1205 pci_release_regions(adapter->dev); 1206 1207 if (adapter->cmd_map) { 1208 pvscsi_free_sgls(adapter); 1209 kfree(adapter->cmd_map); 1210 } 1211 1212 if (adapter->rings_state) 1213 pci_free_consistent(adapter->dev, PAGE_SIZE, 1214 adapter->rings_state, adapter->ringStatePA); 1215 1216 if (adapter->req_ring) 1217 pci_free_consistent(adapter->dev, 1218 adapter->req_pages * PAGE_SIZE, 1219 adapter->req_ring, adapter->reqRingPA); 1220 1221 if (adapter->cmp_ring) 1222 pci_free_consistent(adapter->dev, 1223 adapter->cmp_pages * PAGE_SIZE, 1224 adapter->cmp_ring, adapter->cmpRingPA); 1225 1226 if (adapter->msg_ring) 1227 pci_free_consistent(adapter->dev, 1228 adapter->msg_pages * PAGE_SIZE, 1229 adapter->msg_ring, adapter->msgRingPA); 1230 } 1231 1232 /* 1233 * Allocate scatter gather lists. 1234 * 1235 * These are statically allocated. Trying to be clever was not worth it. 1236 * 1237 * Dynamic allocation can fail, and we can't go deep into the memory 1238 * allocator, since we're a SCSI driver, and trying too hard to allocate 1239 * memory might generate disk I/O. We also don't want to fail disk I/O 1240 * in that case because we can't get an allocation - the I/O could be 1241 * trying to swap out data to free memory. Since that is pathological, 1242 * just use a statically allocated scatter list. 1243 * 1244 */ 1245 static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) 1246 { 1247 struct pvscsi_ctx *ctx; 1248 int i; 1249 1250 ctx = adapter->cmd_map; 1251 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); 1252 1253 for (i = 0; i < adapter->req_depth; ++i, ++ctx) { 1254 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, 1255 get_order(SGL_SIZE)); 1256 ctx->sglPA = 0; 1257 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); 1258 if (!ctx->sgl) { 1259 for (; i >= 0; --i, --ctx) { 1260 free_pages((unsigned long)ctx->sgl, 1261 get_order(SGL_SIZE)); 1262 ctx->sgl = NULL; 1263 } 1264 return -ENOMEM; 1265 } 1266 } 1267 1268 return 0; 1269 } 1270 1271 /* 1272 * Query the device, fetch the config info and return the 1273 * maximum number of targets on the adapter. In case of 1274 * failure due to any reason return default i.e. 16. 1275 */ 1276 static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) 1277 { 1278 struct PVSCSICmdDescConfigCmd cmd; 1279 struct PVSCSIConfigPageHeader *header; 1280 struct device *dev; 1281 dma_addr_t configPagePA; 1282 void *config_page; 1283 u32 numPhys = 16; 1284 1285 dev = pvscsi_dev(adapter); 1286 config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE, 1287 &configPagePA); 1288 if (!config_page) { 1289 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n"); 1290 goto exit; 1291 } 1292 BUG_ON(configPagePA & ~PAGE_MASK); 1293 1294 /* Fetch config info from the device. */ 1295 cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; 1296 cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; 1297 cmd.cmpAddr = configPagePA; 1298 cmd._pad = 0; 1299 1300 /* 1301 * Mark the completion page header with error values. If the device 1302 * completes the command successfully, it sets the status values to 1303 * indicate success. 1304 */ 1305 header = config_page; 1306 memset(header, 0, sizeof *header); 1307 header->hostStatus = BTSTAT_INVPARAM; 1308 header->scsiStatus = SDSTAT_CHECK; 1309 1310 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd); 1311 1312 if (header->hostStatus == BTSTAT_SUCCESS && 1313 header->scsiStatus == SDSTAT_GOOD) { 1314 struct PVSCSIConfigPageController *config; 1315 1316 config = config_page; 1317 numPhys = config->numPhys; 1318 } else 1319 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n", 1320 header->hostStatus, header->scsiStatus); 1321 pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA); 1322 exit: 1323 return numPhys; 1324 } 1325 1326 static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1327 { 1328 struct pvscsi_adapter *adapter; 1329 struct pvscsi_adapter adapter_temp; 1330 struct Scsi_Host *host = NULL; 1331 unsigned int i; 1332 unsigned long flags = 0; 1333 int error; 1334 u32 max_id; 1335 1336 error = -ENODEV; 1337 1338 if (pci_enable_device(pdev)) 1339 return error; 1340 1341 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 && 1342 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) { 1343 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); 1344 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 && 1345 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) { 1346 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); 1347 } else { 1348 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); 1349 goto out_disable_device; 1350 } 1351 1352 /* 1353 * Let's use a temp pvscsi_adapter struct until we find the number of 1354 * targets on the adapter, after that we will switch to the real 1355 * allocated struct. 1356 */ 1357 adapter = &adapter_temp; 1358 memset(adapter, 0, sizeof(*adapter)); 1359 adapter->dev = pdev; 1360 adapter->rev = pdev->revision; 1361 1362 if (pci_request_regions(pdev, "vmw_pvscsi")) { 1363 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); 1364 goto out_disable_device; 1365 } 1366 1367 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 1368 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) 1369 continue; 1370 1371 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) 1372 continue; 1373 1374 break; 1375 } 1376 1377 if (i == DEVICE_COUNT_RESOURCE) { 1378 printk(KERN_ERR 1379 "vmw_pvscsi: adapter has no suitable MMIO region\n"); 1380 goto out_release_resources_and_disable; 1381 } 1382 1383 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); 1384 1385 if (!adapter->mmioBase) { 1386 printk(KERN_ERR 1387 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", 1388 i, PVSCSI_MEM_SPACE_SIZE); 1389 goto out_release_resources_and_disable; 1390 } 1391 1392 pci_set_master(pdev); 1393 1394 /* 1395 * Ask the device for max number of targets before deciding the 1396 * default pvscsi_ring_pages value. 1397 */ 1398 max_id = pvscsi_get_max_targets(adapter); 1399 printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id); 1400 1401 if (pvscsi_ring_pages == 0) 1402 /* 1403 * Set the right default value. Up to 16 it is 8, above it is 1404 * max. 1405 */ 1406 pvscsi_ring_pages = (max_id > 16) ? 1407 PVSCSI_SETUP_RINGS_MAX_NUM_PAGES : 1408 PVSCSI_DEFAULT_NUM_PAGES_PER_RING; 1409 printk(KERN_INFO 1410 "vmw_pvscsi: setting ring_pages to %d\n", 1411 pvscsi_ring_pages); 1412 1413 pvscsi_template.can_queue = 1414 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * 1415 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; 1416 pvscsi_template.cmd_per_lun = 1417 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); 1418 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); 1419 if (!host) { 1420 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); 1421 goto out_release_resources_and_disable; 1422 } 1423 1424 /* 1425 * Let's use the real pvscsi_adapter struct here onwards. 1426 */ 1427 adapter = shost_priv(host); 1428 memset(adapter, 0, sizeof(*adapter)); 1429 adapter->dev = pdev; 1430 adapter->host = host; 1431 /* 1432 * Copy back what we already have to the allocated adapter struct. 1433 */ 1434 adapter->rev = adapter_temp.rev; 1435 adapter->mmioBase = adapter_temp.mmioBase; 1436 1437 spin_lock_init(&adapter->hw_lock); 1438 host->max_channel = 0; 1439 host->max_lun = 1; 1440 host->max_cmd_len = 16; 1441 host->max_id = max_id; 1442 1443 pci_set_drvdata(pdev, host); 1444 1445 ll_adapter_reset(adapter); 1446 1447 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); 1448 1449 error = pvscsi_allocate_rings(adapter); 1450 if (error) { 1451 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); 1452 goto out_release_resources; 1453 } 1454 1455 /* 1456 * From this point on we should reset the adapter if anything goes 1457 * wrong. 1458 */ 1459 pvscsi_setup_all_rings(adapter); 1460 1461 adapter->cmd_map = kcalloc(adapter->req_depth, 1462 sizeof(struct pvscsi_ctx), GFP_KERNEL); 1463 if (!adapter->cmd_map) { 1464 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); 1465 error = -ENOMEM; 1466 goto out_reset_adapter; 1467 } 1468 1469 INIT_LIST_HEAD(&adapter->cmd_pool); 1470 for (i = 0; i < adapter->req_depth; i++) { 1471 struct pvscsi_ctx *ctx = adapter->cmd_map + i; 1472 list_add(&ctx->list, &adapter->cmd_pool); 1473 } 1474 1475 error = pvscsi_allocate_sg(adapter); 1476 if (error) { 1477 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); 1478 goto out_reset_adapter; 1479 } 1480 1481 if (!pvscsi_disable_msix && 1482 pvscsi_setup_msix(adapter, &adapter->irq) == 0) { 1483 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n"); 1484 adapter->use_msix = 1; 1485 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) { 1486 printk(KERN_INFO "vmw_pvscsi: using MSI\n"); 1487 adapter->use_msi = 1; 1488 adapter->irq = pdev->irq; 1489 } else { 1490 printk(KERN_INFO "vmw_pvscsi: using INTx\n"); 1491 adapter->irq = pdev->irq; 1492 flags = IRQF_SHARED; 1493 } 1494 1495 adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true); 1496 printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n", 1497 adapter->use_req_threshold ? "en" : "dis"); 1498 1499 error = request_irq(adapter->irq, pvscsi_isr, flags, 1500 "vmw_pvscsi", adapter); 1501 if (error) { 1502 printk(KERN_ERR 1503 "vmw_pvscsi: unable to request IRQ: %d\n", error); 1504 adapter->irq = 0; 1505 goto out_reset_adapter; 1506 } 1507 1508 error = scsi_add_host(host, &pdev->dev); 1509 if (error) { 1510 printk(KERN_ERR 1511 "vmw_pvscsi: scsi_add_host failed: %d\n", error); 1512 goto out_reset_adapter; 1513 } 1514 1515 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", 1516 adapter->rev, host->host_no); 1517 1518 pvscsi_unmask_intr(adapter); 1519 1520 scsi_scan_host(host); 1521 1522 return 0; 1523 1524 out_reset_adapter: 1525 ll_adapter_reset(adapter); 1526 out_release_resources: 1527 pvscsi_release_resources(adapter); 1528 scsi_host_put(host); 1529 out_disable_device: 1530 pci_disable_device(pdev); 1531 1532 return error; 1533 1534 out_release_resources_and_disable: 1535 pvscsi_release_resources(adapter); 1536 goto out_disable_device; 1537 } 1538 1539 static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) 1540 { 1541 pvscsi_mask_intr(adapter); 1542 1543 if (adapter->workqueue) 1544 flush_workqueue(adapter->workqueue); 1545 1546 pvscsi_shutdown_intr(adapter); 1547 1548 pvscsi_process_request_ring(adapter); 1549 pvscsi_process_completion_ring(adapter); 1550 ll_adapter_reset(adapter); 1551 } 1552 1553 static void pvscsi_shutdown(struct pci_dev *dev) 1554 { 1555 struct Scsi_Host *host = pci_get_drvdata(dev); 1556 struct pvscsi_adapter *adapter = shost_priv(host); 1557 1558 __pvscsi_shutdown(adapter); 1559 } 1560 1561 static void pvscsi_remove(struct pci_dev *pdev) 1562 { 1563 struct Scsi_Host *host = pci_get_drvdata(pdev); 1564 struct pvscsi_adapter *adapter = shost_priv(host); 1565 1566 scsi_remove_host(host); 1567 1568 __pvscsi_shutdown(adapter); 1569 pvscsi_release_resources(adapter); 1570 1571 scsi_host_put(host); 1572 1573 pci_disable_device(pdev); 1574 } 1575 1576 static struct pci_driver pvscsi_pci_driver = { 1577 .name = "vmw_pvscsi", 1578 .id_table = pvscsi_pci_tbl, 1579 .probe = pvscsi_probe, 1580 .remove = pvscsi_remove, 1581 .shutdown = pvscsi_shutdown, 1582 }; 1583 1584 static int __init pvscsi_init(void) 1585 { 1586 pr_info("%s - version %s\n", 1587 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); 1588 return pci_register_driver(&pvscsi_pci_driver); 1589 } 1590 1591 static void __exit pvscsi_exit(void) 1592 { 1593 pci_unregister_driver(&pvscsi_pci_driver); 1594 } 1595 1596 module_init(pvscsi_init); 1597 module_exit(pvscsi_exit); 1598