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 */ 21 22#include <linux/kernel.h> 23#include <linux/module.h> 24#include <linux/interrupt.h> 25#include <linux/slab.h> 26#include <linux/workqueue.h> 27#include <linux/pci.h> 28 29#include <scsi/scsi.h> 30#include <scsi/scsi_host.h> 31#include <scsi/scsi_cmnd.h> 32#include <scsi/scsi_device.h> 33#include <scsi/scsi_tcq.h> 34 35#include "vmw_pvscsi.h" 36 37#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" 38 39MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); 40MODULE_AUTHOR("VMware, Inc."); 41MODULE_LICENSE("GPL"); 42MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); 43 44#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 45#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 46#define PVSCSI_DEFAULT_QUEUE_DEPTH 254 47#define SGL_SIZE PAGE_SIZE 48 49struct pvscsi_sg_list { 50 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; 51}; 52 53struct pvscsi_ctx { 54 /* 55 * The index of the context in cmd_map serves as the context ID for a 56 * 1-to-1 mapping completions back to requests. 57 */ 58 struct scsi_cmnd *cmd; 59 struct pvscsi_sg_list *sgl; 60 struct list_head list; 61 dma_addr_t dataPA; 62 dma_addr_t sensePA; 63 dma_addr_t sglPA; 64 struct completion *abort_cmp; 65}; 66 67struct pvscsi_adapter { 68 char *mmioBase; 69 u8 rev; 70 bool use_msg; 71 bool use_req_threshold; 72 73 spinlock_t hw_lock; 74 75 struct workqueue_struct *workqueue; 76 struct work_struct work; 77 78 struct PVSCSIRingReqDesc *req_ring; 79 unsigned req_pages; 80 unsigned req_depth; 81 dma_addr_t reqRingPA; 82 83 struct PVSCSIRingCmpDesc *cmp_ring; 84 unsigned cmp_pages; 85 dma_addr_t cmpRingPA; 86 87 struct PVSCSIRingMsgDesc *msg_ring; 88 unsigned msg_pages; 89 dma_addr_t msgRingPA; 90 91 struct PVSCSIRingsState *rings_state; 92 dma_addr_t ringStatePA; 93 94 struct pci_dev *dev; 95 struct Scsi_Host *host; 96 97 struct list_head cmd_pool; 98 struct pvscsi_ctx *cmd_map; 99}; 100 101 102/* Command line parameters */ 103static int pvscsi_ring_pages; 104static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; 105static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; 106static bool pvscsi_disable_msi; 107static bool pvscsi_disable_msix; 108static bool pvscsi_use_msg = true; 109static bool pvscsi_use_req_threshold = true; 110 111#define PVSCSI_RW (S_IRUSR | S_IWUSR) 112 113module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); 114MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" 115 __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) 116 "[up to 16 targets]," 117 __stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) 118 "[for 16+ targets])"); 119 120module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); 121MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" 122 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); 123 124module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); 125MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" 126 __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")"); 127 128module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); 129MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); 130 131module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); 132MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); 133 134module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); 135MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); 136 137module_param_named(use_req_threshold, pvscsi_use_req_threshold, 138 bool, PVSCSI_RW); 139MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)"); 140 141static const struct pci_device_id pvscsi_pci_tbl[] = { 142 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, 143 { 0 } 144}; 145 146MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); 147 148static struct device * 149pvscsi_dev(const struct pvscsi_adapter *adapter) 150{ 151 return &(adapter->dev->dev); 152} 153 154static struct pvscsi_ctx * 155pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) 156{ 157 struct pvscsi_ctx *ctx, *end; 158 159 end = &adapter->cmd_map[adapter->req_depth]; 160 for (ctx = adapter->cmd_map; ctx < end; ctx++) 161 if (ctx->cmd == cmd) 162 return ctx; 163 164 return NULL; 165} 166 167static struct pvscsi_ctx * 168pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) 169{ 170 struct pvscsi_ctx *ctx; 171 172 if (list_empty(&adapter->cmd_pool)) 173 return NULL; 174 175 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); 176 ctx->cmd = cmd; 177 list_del(&ctx->list); 178 179 return ctx; 180} 181 182static void pvscsi_release_context(struct pvscsi_adapter *adapter, 183 struct pvscsi_ctx *ctx) 184{ 185 ctx->cmd = NULL; 186 ctx->abort_cmp = NULL; 187 list_add(&ctx->list, &adapter->cmd_pool); 188} 189 190/* 191 * Map a pvscsi_ctx struct to a context ID field value; we map to a simple 192 * non-zero integer. ctx always points to an entry in cmd_map array, hence 193 * the return value is always >=1. 194 */ 195static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, 196 const struct pvscsi_ctx *ctx) 197{ 198 return ctx - adapter->cmd_map + 1; 199} 200 201static struct pvscsi_ctx * 202pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) 203{ 204 return &adapter->cmd_map[context - 1]; 205} 206 207static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, 208 u32 offset, u32 val) 209{ 210 writel(val, adapter->mmioBase + offset); 211} 212 213static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) 214{ 215 return readl(adapter->mmioBase + offset); 216} 217 218static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) 219{ 220 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); 221} 222 223static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, 224 u32 val) 225{ 226 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); 227} 228 229static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) 230{ 231 u32 intr_bits; 232 233 intr_bits = PVSCSI_INTR_CMPL_MASK; 234 if (adapter->use_msg) 235 intr_bits |= PVSCSI_INTR_MSG_MASK; 236 237 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); 238} 239 240static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) 241{ 242 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); 243} 244 245static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, 246 u32 cmd, const void *desc, size_t len) 247{ 248 const u32 *ptr = desc; 249 size_t i; 250 251 len /= sizeof(*ptr); 252 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); 253 for (i = 0; i < len; i++) 254 pvscsi_reg_write(adapter, 255 PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); 256} 257 258static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, 259 const struct pvscsi_ctx *ctx) 260{ 261 struct PVSCSICmdDescAbortCmd cmd = { 0 }; 262 263 cmd.target = ctx->cmd->device->id; 264 cmd.context = pvscsi_map_context(adapter, ctx); 265 266 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); 267} 268 269static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) 270{ 271 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); 272} 273 274static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) 275{ 276 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); 277} 278 279static int scsi_is_rw(unsigned char op) 280{ 281 return op == READ_6 || op == WRITE_6 || 282 op == READ_10 || op == WRITE_10 || 283 op == READ_12 || op == WRITE_12 || 284 op == READ_16 || op == WRITE_16; 285} 286 287static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, 288 unsigned char op) 289{ 290 if (scsi_is_rw(op)) { 291 struct PVSCSIRingsState *s = adapter->rings_state; 292 293 if (!adapter->use_req_threshold || 294 s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) 295 pvscsi_kick_rw_io(adapter); 296 } else { 297 pvscsi_process_request_ring(adapter); 298 } 299} 300 301static void ll_adapter_reset(const struct pvscsi_adapter *adapter) 302{ 303 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); 304 305 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); 306} 307 308static void ll_bus_reset(const struct pvscsi_adapter *adapter) 309{ 310 dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter); 311 312 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); 313} 314 315static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) 316{ 317 struct PVSCSICmdDescResetDevice cmd = { 0 }; 318 319 dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target); 320 321 cmd.target = target; 322 323 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, 324 &cmd, sizeof(cmd)); 325} 326 327static void pvscsi_create_sg(struct pvscsi_ctx *ctx, 328 struct scatterlist *sg, unsigned count) 329{ 330 unsigned i; 331 struct PVSCSISGElement *sge; 332 333 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); 334 335 sge = &ctx->sgl->sge[0]; 336 for (i = 0; i < count; i++, sg = sg_next(sg)) { 337 sge[i].addr = sg_dma_address(sg); 338 sge[i].length = sg_dma_len(sg); 339 sge[i].flags = 0; 340 } 341} 342 343/* 344 * Map all data buffers for a command into PCI space and 345 * setup the scatter/gather list if needed. 346 */ 347static int pvscsi_map_buffers(struct pvscsi_adapter *adapter, 348 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, 349 struct PVSCSIRingReqDesc *e) 350{ 351 unsigned count; 352 unsigned bufflen = scsi_bufflen(cmd); 353 struct scatterlist *sg; 354 355 e->dataLen = bufflen; 356 e->dataAddr = 0; 357 if (bufflen == 0) 358 return 0; 359 360 sg = scsi_sglist(cmd); 361 count = scsi_sg_count(cmd); 362 if (count != 0) { 363 int segs = scsi_dma_map(cmd); 364 365 if (segs == -ENOMEM) { 366 scmd_printk(KERN_DEBUG, cmd, 367 "vmw_pvscsi: Failed to map cmd sglist for DMA.\n"); 368 return -ENOMEM; 369 } else if (segs > 1) { 370 pvscsi_create_sg(ctx, sg, segs); 371 372 e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; 373 ctx->sglPA = dma_map_single(&adapter->dev->dev, 374 ctx->sgl, SGL_SIZE, DMA_TO_DEVICE); 375 if (dma_mapping_error(&adapter->dev->dev, ctx->sglPA)) { 376 scmd_printk(KERN_ERR, cmd, 377 "vmw_pvscsi: Failed to map ctx sglist for DMA.\n"); 378 scsi_dma_unmap(cmd); 379 ctx->sglPA = 0; 380 return -ENOMEM; 381 } 382 e->dataAddr = ctx->sglPA; 383 } else 384 e->dataAddr = sg_dma_address(sg); 385 } else { 386 /* 387 * In case there is no S/G list, scsi_sglist points 388 * directly to the buffer. 389 */ 390 ctx->dataPA = dma_map_single(&adapter->dev->dev, sg, bufflen, 391 cmd->sc_data_direction); 392 if (dma_mapping_error(&adapter->dev->dev, ctx->dataPA)) { 393 scmd_printk(KERN_DEBUG, cmd, 394 "vmw_pvscsi: Failed to map direct data buffer for DMA.\n"); 395 return -ENOMEM; 396 } 397 e->dataAddr = ctx->dataPA; 398 } 399 400 return 0; 401} 402 403/* 404 * The device incorrectly doesn't clear the first byte of the sense 405 * buffer in some cases. We have to do it ourselves. 406 * Otherwise we run into trouble when SWIOTLB is forced. 407 */ 408static void pvscsi_patch_sense(struct scsi_cmnd *cmd) 409{ 410 if (cmd->sense_buffer) 411 cmd->sense_buffer[0] = 0; 412} 413 414static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, 415 struct pvscsi_ctx *ctx) 416{ 417 struct scsi_cmnd *cmd; 418 unsigned bufflen; 419 420 cmd = ctx->cmd; 421 bufflen = scsi_bufflen(cmd); 422 423 if (bufflen != 0) { 424 unsigned count = scsi_sg_count(cmd); 425 426 if (count != 0) { 427 scsi_dma_unmap(cmd); 428 if (ctx->sglPA) { 429 dma_unmap_single(&adapter->dev->dev, ctx->sglPA, 430 SGL_SIZE, DMA_TO_DEVICE); 431 ctx->sglPA = 0; 432 } 433 } else 434 dma_unmap_single(&adapter->dev->dev, ctx->dataPA, 435 bufflen, cmd->sc_data_direction); 436 } 437 if (cmd->sense_buffer) 438 dma_unmap_single(&adapter->dev->dev, ctx->sensePA, 439 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); 440} 441 442static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) 443{ 444 adapter->rings_state = dma_alloc_coherent(&adapter->dev->dev, PAGE_SIZE, 445 &adapter->ringStatePA, GFP_KERNEL); 446 if (!adapter->rings_state) 447 return -ENOMEM; 448 449 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, 450 pvscsi_ring_pages); 451 adapter->req_depth = adapter->req_pages 452 * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; 453 adapter->req_ring = dma_alloc_coherent(&adapter->dev->dev, 454 adapter->req_pages * PAGE_SIZE, &adapter->reqRingPA, 455 GFP_KERNEL); 456 if (!adapter->req_ring) 457 return -ENOMEM; 458 459 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, 460 pvscsi_ring_pages); 461 adapter->cmp_ring = dma_alloc_coherent(&adapter->dev->dev, 462 adapter->cmp_pages * PAGE_SIZE, &adapter->cmpRingPA, 463 GFP_KERNEL); 464 if (!adapter->cmp_ring) 465 return -ENOMEM; 466 467 BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); 468 BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); 469 BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); 470 471 if (!adapter->use_msg) 472 return 0; 473 474 adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, 475 pvscsi_msg_ring_pages); 476 adapter->msg_ring = dma_alloc_coherent(&adapter->dev->dev, 477 adapter->msg_pages * PAGE_SIZE, &adapter->msgRingPA, 478 GFP_KERNEL); 479 if (!adapter->msg_ring) 480 return -ENOMEM; 481 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); 482 483 return 0; 484} 485 486static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) 487{ 488 struct PVSCSICmdDescSetupRings cmd = { 0 }; 489 dma_addr_t base; 490 unsigned i; 491 492 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; 493 cmd.reqRingNumPages = adapter->req_pages; 494 cmd.cmpRingNumPages = adapter->cmp_pages; 495 496 base = adapter->reqRingPA; 497 for (i = 0; i < adapter->req_pages; i++) { 498 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; 499 base += PAGE_SIZE; 500 } 501 502 base = adapter->cmpRingPA; 503 for (i = 0; i < adapter->cmp_pages; i++) { 504 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; 505 base += PAGE_SIZE; 506 } 507 508 memset(adapter->rings_state, 0, PAGE_SIZE); 509 memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); 510 memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); 511 512 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, 513 &cmd, sizeof(cmd)); 514 515 if (adapter->use_msg) { 516 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; 517 518 cmd_msg.numPages = adapter->msg_pages; 519 520 base = adapter->msgRingPA; 521 for (i = 0; i < adapter->msg_pages; i++) { 522 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; 523 base += PAGE_SIZE; 524 } 525 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); 526 527 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, 528 &cmd_msg, sizeof(cmd_msg)); 529 } 530} 531 532static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) 533{ 534 if (!sdev->tagged_supported) 535 qdepth = 1; 536 return scsi_change_queue_depth(sdev, qdepth); 537} 538 539/* 540 * Pull a completion descriptor off and pass the completion back 541 * to the SCSI mid layer. 542 */ 543static void pvscsi_complete_request(struct pvscsi_adapter *adapter, 544 const struct PVSCSIRingCmpDesc *e) 545{ 546 struct pvscsi_ctx *ctx; 547 struct scsi_cmnd *cmd; 548 struct completion *abort_cmp; 549 u32 btstat = e->hostStatus; 550 u32 sdstat = e->scsiStatus; 551 552 ctx = pvscsi_get_context(adapter, e->context); 553 cmd = ctx->cmd; 554 abort_cmp = ctx->abort_cmp; 555 pvscsi_unmap_buffers(adapter, ctx); 556 if (sdstat != SAM_STAT_CHECK_CONDITION) 557 pvscsi_patch_sense(cmd); 558 pvscsi_release_context(adapter, ctx); 559 if (abort_cmp) { 560 /* 561 * The command was requested to be aborted. Just signal that 562 * the request completed and swallow the actual cmd completion 563 * here. The abort handler will post a completion for this 564 * command indicating that it got successfully aborted. 565 */ 566 complete(abort_cmp); 567 return; 568 } 569 570 cmd->result = 0; 571 if (sdstat != SAM_STAT_GOOD && 572 (btstat == BTSTAT_SUCCESS || 573 btstat == BTSTAT_LINKED_COMMAND_COMPLETED || 574 btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { 575 if (sdstat == SAM_STAT_COMMAND_TERMINATED) { 576 cmd->result = (DID_RESET << 16); 577 } else { 578 cmd->result = (DID_OK << 16) | sdstat; 579 } 580 } else 581 switch (btstat) { 582 case BTSTAT_SUCCESS: 583 case BTSTAT_LINKED_COMMAND_COMPLETED: 584 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: 585 /* 586 * Commands like INQUIRY may transfer less data than 587 * requested by the initiator via bufflen. Set residual 588 * count to make upper layer aware of the actual amount 589 * of data returned. There are cases when controller 590 * returns zero dataLen with non zero data - do not set 591 * residual count in that case. 592 */ 593 if (e->dataLen && (e->dataLen < scsi_bufflen(cmd))) 594 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); 595 cmd->result = (DID_OK << 16); 596 break; 597 598 case BTSTAT_DATARUN: 599 case BTSTAT_DATA_UNDERRUN: 600 /* Report residual data in underruns */ 601 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); 602 cmd->result = (DID_ERROR << 16); 603 break; 604 605 case BTSTAT_SELTIMEO: 606 /* Our emulation returns this for non-connected devs */ 607 cmd->result = (DID_BAD_TARGET << 16); 608 break; 609 610 case BTSTAT_LUNMISMATCH: 611 case BTSTAT_TAGREJECT: 612 case BTSTAT_BADMSG: 613 case BTSTAT_HAHARDWARE: 614 case BTSTAT_INVPHASE: 615 case BTSTAT_HATIMEOUT: 616 case BTSTAT_NORESPONSE: 617 case BTSTAT_DISCONNECT: 618 case BTSTAT_HASOFTWARE: 619 case BTSTAT_BUSFREE: 620 case BTSTAT_SENSFAILED: 621 cmd->result |= (DID_ERROR << 16); 622 break; 623 624 case BTSTAT_SENTRST: 625 case BTSTAT_RECVRST: 626 case BTSTAT_BUSRESET: 627 cmd->result = (DID_RESET << 16); 628 break; 629 630 case BTSTAT_ABORTQUEUE: 631 cmd->result = (DID_BUS_BUSY << 16); 632 break; 633 634 case BTSTAT_SCSIPARITY: 635 cmd->result = (DID_PARITY << 16); 636 break; 637 638 default: 639 cmd->result = (DID_ERROR << 16); 640 scmd_printk(KERN_DEBUG, cmd, 641 "Unknown completion status: 0x%x\n", 642 btstat); 643 } 644 645 dev_dbg(&cmd->device->sdev_gendev, 646 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", 647 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); 648 649 scsi_done(cmd); 650} 651 652/* 653 * barrier usage : Since the PVSCSI device is emulated, there could be cases 654 * where we may want to serialize some accesses between the driver and the 655 * emulation layer. We use compiler barriers instead of the more expensive 656 * memory barriers because PVSCSI is only supported on X86 which has strong 657 * memory access ordering. 658 */ 659static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) 660{ 661 struct PVSCSIRingsState *s = adapter->rings_state; 662 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; 663 u32 cmp_entries = s->cmpNumEntriesLog2; 664 665 while (s->cmpConsIdx != s->cmpProdIdx) { 666 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & 667 MASK(cmp_entries)); 668 /* 669 * This barrier() ensures that *e is not dereferenced while 670 * the device emulation still writes data into the slot. 671 * Since the device emulation advances s->cmpProdIdx only after 672 * updating the slot we want to check it first. 673 */ 674 barrier(); 675 pvscsi_complete_request(adapter, e); 676 /* 677 * This barrier() ensures that compiler doesn't reorder write 678 * to s->cmpConsIdx before the read of (*e) inside 679 * pvscsi_complete_request. Otherwise, device emulation may 680 * overwrite *e before we had a chance to read it. 681 */ 682 barrier(); 683 s->cmpConsIdx++; 684 } 685} 686 687/* 688 * Translate a Linux SCSI request into a request ring entry. 689 */ 690static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, 691 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) 692{ 693 struct PVSCSIRingsState *s; 694 struct PVSCSIRingReqDesc *e; 695 struct scsi_device *sdev; 696 u32 req_entries; 697 698 s = adapter->rings_state; 699 sdev = cmd->device; 700 req_entries = s->reqNumEntriesLog2; 701 702 /* 703 * If this condition holds, we might have room on the request ring, but 704 * we might not have room on the completion ring for the response. 705 * However, we have already ruled out this possibility - we would not 706 * have successfully allocated a context if it were true, since we only 707 * have one context per request entry. Check for it anyway, since it 708 * would be a serious bug. 709 */ 710 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { 711 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " 712 "ring full: reqProdIdx=%d cmpConsIdx=%d\n", 713 s->reqProdIdx, s->cmpConsIdx); 714 return -1; 715 } 716 717 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); 718 719 e->bus = sdev->channel; 720 e->target = sdev->id; 721 memset(e->lun, 0, sizeof(e->lun)); 722 e->lun[1] = sdev->lun; 723 724 if (cmd->sense_buffer) { 725 ctx->sensePA = dma_map_single(&adapter->dev->dev, 726 cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 727 DMA_FROM_DEVICE); 728 if (dma_mapping_error(&adapter->dev->dev, ctx->sensePA)) { 729 scmd_printk(KERN_DEBUG, cmd, 730 "vmw_pvscsi: Failed to map sense buffer for DMA.\n"); 731 ctx->sensePA = 0; 732 return -ENOMEM; 733 } 734 e->senseAddr = ctx->sensePA; 735 e->senseLen = SCSI_SENSE_BUFFERSIZE; 736 } else { 737 e->senseLen = 0; 738 e->senseAddr = 0; 739 } 740 e->cdbLen = cmd->cmd_len; 741 e->vcpuHint = smp_processor_id(); 742 memcpy(e->cdb, cmd->cmnd, e->cdbLen); 743 744 e->tag = SIMPLE_QUEUE_TAG; 745 746 if (cmd->sc_data_direction == DMA_FROM_DEVICE) 747 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; 748 else if (cmd->sc_data_direction == DMA_TO_DEVICE) 749 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; 750 else if (cmd->sc_data_direction == DMA_NONE) 751 e->flags = PVSCSI_FLAG_CMD_DIR_NONE; 752 else 753 e->flags = 0; 754 755 if (pvscsi_map_buffers(adapter, ctx, cmd, e) != 0) { 756 if (cmd->sense_buffer) { 757 dma_unmap_single(&adapter->dev->dev, ctx->sensePA, 758 SCSI_SENSE_BUFFERSIZE, 759 DMA_FROM_DEVICE); 760 ctx->sensePA = 0; 761 } 762 return -ENOMEM; 763 } 764 765 e->context = pvscsi_map_context(adapter, ctx); 766 767 barrier(); 768 769 s->reqProdIdx++; 770 771 return 0; 772} 773 774static int pvscsi_queue_lck(struct scsi_cmnd *cmd) 775{ 776 struct Scsi_Host *host = cmd->device->host; 777 struct pvscsi_adapter *adapter = shost_priv(host); 778 struct pvscsi_ctx *ctx; 779 unsigned long flags; 780 unsigned char op; 781 782 spin_lock_irqsave(&adapter->hw_lock, flags); 783 784 ctx = pvscsi_acquire_context(adapter, cmd); 785 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { 786 if (ctx) 787 pvscsi_release_context(adapter, ctx); 788 spin_unlock_irqrestore(&adapter->hw_lock, flags); 789 return SCSI_MLQUEUE_HOST_BUSY; 790 } 791 792 op = cmd->cmnd[0]; 793 794 dev_dbg(&cmd->device->sdev_gendev, 795 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, op); 796 797 spin_unlock_irqrestore(&adapter->hw_lock, flags); 798 799 pvscsi_kick_io(adapter, op); 800 801 return 0; 802} 803 804static DEF_SCSI_QCMD(pvscsi_queue) 805 806static int pvscsi_abort(struct scsi_cmnd *cmd) 807{ 808 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); 809 struct pvscsi_ctx *ctx; 810 unsigned long flags; 811 int result = SUCCESS; 812 DECLARE_COMPLETION_ONSTACK(abort_cmp); 813 int done; 814 815 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", 816 adapter->host->host_no, cmd); 817 818 spin_lock_irqsave(&adapter->hw_lock, flags); 819 820 /* 821 * Poll the completion ring first - we might be trying to abort 822 * a command that is waiting to be dispatched in the completion ring. 823 */ 824 pvscsi_process_completion_ring(adapter); 825 826 /* 827 * If there is no context for the command, it either already succeeded 828 * or else was never properly issued. Not our problem. 829 */ 830 ctx = pvscsi_find_context(adapter, cmd); 831 if (!ctx) { 832 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); 833 goto out; 834 } 835 836 /* 837 * Mark that the command has been requested to be aborted and issue 838 * the abort. 839 */ 840 ctx->abort_cmp = &abort_cmp; 841 842 pvscsi_abort_cmd(adapter, ctx); 843 spin_unlock_irqrestore(&adapter->hw_lock, flags); 844 /* Wait for 2 secs for the completion. */ 845 done = wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000)); 846 spin_lock_irqsave(&adapter->hw_lock, flags); 847 848 if (!done) { 849 /* 850 * Failed to abort the command, unmark the fact that it 851 * was requested to be aborted. 852 */ 853 ctx->abort_cmp = NULL; 854 result = FAILED; 855 scmd_printk(KERN_DEBUG, cmd, 856 "Failed to get completion for aborted cmd %p\n", 857 cmd); 858 goto out; 859 } 860 861 /* 862 * Successfully aborted the command. 863 */ 864 cmd->result = (DID_ABORT << 16); 865 scsi_done(cmd); 866 867out: 868 spin_unlock_irqrestore(&adapter->hw_lock, flags); 869 return result; 870} 871 872/* 873 * Abort all outstanding requests. This is only safe to use if the completion 874 * ring will never be walked again or the device has been reset, because it 875 * destroys the 1-1 mapping between context field passed to emulation and our 876 * request structure. 877 */ 878static void pvscsi_reset_all(struct pvscsi_adapter *adapter) 879{ 880 unsigned i; 881 882 for (i = 0; i < adapter->req_depth; i++) { 883 struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; 884 struct scsi_cmnd *cmd = ctx->cmd; 885 if (cmd) { 886 scmd_printk(KERN_ERR, cmd, 887 "Forced reset on cmd %p\n", cmd); 888 pvscsi_unmap_buffers(adapter, ctx); 889 pvscsi_patch_sense(cmd); 890 pvscsi_release_context(adapter, ctx); 891 cmd->result = (DID_RESET << 16); 892 scsi_done(cmd); 893 } 894 } 895} 896 897static int pvscsi_host_reset(struct scsi_cmnd *cmd) 898{ 899 struct Scsi_Host *host = cmd->device->host; 900 struct pvscsi_adapter *adapter = shost_priv(host); 901 unsigned long flags; 902 bool use_msg; 903 904 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); 905 906 spin_lock_irqsave(&adapter->hw_lock, flags); 907 908 use_msg = adapter->use_msg; 909 910 if (use_msg) { 911 adapter->use_msg = false; 912 spin_unlock_irqrestore(&adapter->hw_lock, flags); 913 914 /* 915 * Now that we know that the ISR won't add more work on the 916 * workqueue we can safely flush any outstanding work. 917 */ 918 flush_workqueue(adapter->workqueue); 919 spin_lock_irqsave(&adapter->hw_lock, flags); 920 } 921 922 /* 923 * We're going to tear down the entire ring structure and set it back 924 * up, so stalling new requests until all completions are flushed and 925 * the rings are back in place. 926 */ 927 928 pvscsi_process_request_ring(adapter); 929 930 ll_adapter_reset(adapter); 931 932 /* 933 * Now process any completions. Note we do this AFTER adapter reset, 934 * which is strange, but stops races where completions get posted 935 * between processing the ring and issuing the reset. The backend will 936 * not touch the ring memory after reset, so the immediately pre-reset 937 * completion ring state is still valid. 938 */ 939 pvscsi_process_completion_ring(adapter); 940 941 pvscsi_reset_all(adapter); 942 adapter->use_msg = use_msg; 943 pvscsi_setup_all_rings(adapter); 944 pvscsi_unmask_intr(adapter); 945 946 spin_unlock_irqrestore(&adapter->hw_lock, flags); 947 948 return SUCCESS; 949} 950 951static int pvscsi_bus_reset(struct scsi_cmnd *cmd) 952{ 953 struct Scsi_Host *host = cmd->device->host; 954 struct pvscsi_adapter *adapter = shost_priv(host); 955 unsigned long flags; 956 957 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); 958 959 /* 960 * We don't want to queue new requests for this bus after 961 * flushing all pending requests to emulation, since new 962 * requests could then sneak in during this bus reset phase, 963 * so take the lock now. 964 */ 965 spin_lock_irqsave(&adapter->hw_lock, flags); 966 967 pvscsi_process_request_ring(adapter); 968 ll_bus_reset(adapter); 969 pvscsi_process_completion_ring(adapter); 970 971 spin_unlock_irqrestore(&adapter->hw_lock, flags); 972 973 return SUCCESS; 974} 975 976static int pvscsi_device_reset(struct scsi_cmnd *cmd) 977{ 978 struct Scsi_Host *host = cmd->device->host; 979 struct pvscsi_adapter *adapter = shost_priv(host); 980 unsigned long flags; 981 982 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", 983 host->host_no, cmd->device->id); 984 985 /* 986 * We don't want to queue new requests for this device after flushing 987 * all pending requests to emulation, since new requests could then 988 * sneak in during this device reset phase, so take the lock now. 989 */ 990 spin_lock_irqsave(&adapter->hw_lock, flags); 991 992 pvscsi_process_request_ring(adapter); 993 ll_device_reset(adapter, cmd->device->id); 994 pvscsi_process_completion_ring(adapter); 995 996 spin_unlock_irqrestore(&adapter->hw_lock, flags); 997 998 return SUCCESS; 999} 1000 1001static struct scsi_host_template pvscsi_template; 1002 1003static const char *pvscsi_info(struct Scsi_Host *host) 1004{ 1005 struct pvscsi_adapter *adapter = shost_priv(host); 1006 static char buf[256]; 1007 1008 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " 1009 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, 1010 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, 1011 pvscsi_template.cmd_per_lun); 1012 1013 return buf; 1014} 1015 1016static struct scsi_host_template pvscsi_template = { 1017 .module = THIS_MODULE, 1018 .name = "VMware PVSCSI Host Adapter", 1019 .proc_name = "vmw_pvscsi", 1020 .info = pvscsi_info, 1021 .queuecommand = pvscsi_queue, 1022 .this_id = -1, 1023 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, 1024 .dma_boundary = UINT_MAX, 1025 .max_sectors = 0xffff, 1026 .change_queue_depth = pvscsi_change_queue_depth, 1027 .eh_abort_handler = pvscsi_abort, 1028 .eh_device_reset_handler = pvscsi_device_reset, 1029 .eh_bus_reset_handler = pvscsi_bus_reset, 1030 .eh_host_reset_handler = pvscsi_host_reset, 1031}; 1032 1033static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, 1034 const struct PVSCSIRingMsgDesc *e) 1035{ 1036 struct PVSCSIRingsState *s = adapter->rings_state; 1037 struct Scsi_Host *host = adapter->host; 1038 struct scsi_device *sdev; 1039 1040 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", 1041 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); 1042 1043 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); 1044 1045 if (e->type == PVSCSI_MSG_DEV_ADDED) { 1046 struct PVSCSIMsgDescDevStatusChanged *desc; 1047 desc = (struct PVSCSIMsgDescDevStatusChanged *)e; 1048 1049 printk(KERN_INFO 1050 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", 1051 desc->bus, desc->target, desc->lun[1]); 1052 1053 if (!scsi_host_get(host)) 1054 return; 1055 1056 sdev = scsi_device_lookup(host, desc->bus, desc->target, 1057 desc->lun[1]); 1058 if (sdev) { 1059 printk(KERN_INFO "vmw_pvscsi: device already exists\n"); 1060 scsi_device_put(sdev); 1061 } else 1062 scsi_add_device(adapter->host, desc->bus, 1063 desc->target, desc->lun[1]); 1064 1065 scsi_host_put(host); 1066 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { 1067 struct PVSCSIMsgDescDevStatusChanged *desc; 1068 desc = (struct PVSCSIMsgDescDevStatusChanged *)e; 1069 1070 printk(KERN_INFO 1071 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", 1072 desc->bus, desc->target, desc->lun[1]); 1073 1074 if (!scsi_host_get(host)) 1075 return; 1076 1077 sdev = scsi_device_lookup(host, desc->bus, desc->target, 1078 desc->lun[1]); 1079 if (sdev) { 1080 scsi_remove_device(sdev); 1081 scsi_device_put(sdev); 1082 } else 1083 printk(KERN_INFO 1084 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", 1085 desc->bus, desc->target, desc->lun[1]); 1086 1087 scsi_host_put(host); 1088 } 1089} 1090 1091static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) 1092{ 1093 struct PVSCSIRingsState *s = adapter->rings_state; 1094 1095 return s->msgProdIdx != s->msgConsIdx; 1096} 1097 1098static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) 1099{ 1100 struct PVSCSIRingsState *s = adapter->rings_state; 1101 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; 1102 u32 msg_entries = s->msgNumEntriesLog2; 1103 1104 while (pvscsi_msg_pending(adapter)) { 1105 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & 1106 MASK(msg_entries)); 1107 1108 barrier(); 1109 pvscsi_process_msg(adapter, e); 1110 barrier(); 1111 s->msgConsIdx++; 1112 } 1113} 1114 1115static void pvscsi_msg_workqueue_handler(struct work_struct *data) 1116{ 1117 struct pvscsi_adapter *adapter; 1118 1119 adapter = container_of(data, struct pvscsi_adapter, work); 1120 1121 pvscsi_process_msg_ring(adapter); 1122} 1123 1124static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) 1125{ 1126 char name[32]; 1127 1128 if (!pvscsi_use_msg) 1129 return 0; 1130 1131 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, 1132 PVSCSI_CMD_SETUP_MSG_RING); 1133 1134 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) 1135 return 0; 1136 1137 snprintf(name, sizeof(name), 1138 "vmw_pvscsi_wq_%u", adapter->host->host_no); 1139 1140 adapter->workqueue = create_singlethread_workqueue(name); 1141 if (!adapter->workqueue) { 1142 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); 1143 return 0; 1144 } 1145 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); 1146 1147 return 1; 1148} 1149 1150static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, 1151 bool enable) 1152{ 1153 u32 val; 1154 1155 if (!pvscsi_use_req_threshold) 1156 return false; 1157 1158 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, 1159 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); 1160 val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS); 1161 if (val == -1) { 1162 printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n"); 1163 return false; 1164 } else { 1165 struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; 1166 cmd_msg.enable = enable; 1167 printk(KERN_INFO 1168 "vmw_pvscsi: %sabling reqCallThreshold\n", 1169 enable ? "en" : "dis"); 1170 pvscsi_write_cmd_desc(adapter, 1171 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, 1172 &cmd_msg, sizeof(cmd_msg)); 1173 return pvscsi_reg_read(adapter, 1174 PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; 1175 } 1176} 1177 1178static irqreturn_t pvscsi_isr(int irq, void *devp) 1179{ 1180 struct pvscsi_adapter *adapter = devp; 1181 unsigned long flags; 1182 1183 spin_lock_irqsave(&adapter->hw_lock, flags); 1184 pvscsi_process_completion_ring(adapter); 1185 if (adapter->use_msg && pvscsi_msg_pending(adapter)) 1186 queue_work(adapter->workqueue, &adapter->work); 1187 spin_unlock_irqrestore(&adapter->hw_lock, flags); 1188 1189 return IRQ_HANDLED; 1190} 1191 1192static irqreturn_t pvscsi_shared_isr(int irq, void *devp) 1193{ 1194 struct pvscsi_adapter *adapter = devp; 1195 u32 val = pvscsi_read_intr_status(adapter); 1196 1197 if (!(val & PVSCSI_INTR_ALL_SUPPORTED)) 1198 return IRQ_NONE; 1199 pvscsi_write_intr_status(devp, val); 1200 return pvscsi_isr(irq, devp); 1201} 1202 1203static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) 1204{ 1205 struct pvscsi_ctx *ctx = adapter->cmd_map; 1206 unsigned i; 1207 1208 for (i = 0; i < adapter->req_depth; ++i, ++ctx) 1209 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); 1210} 1211 1212static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) 1213{ 1214 free_irq(pci_irq_vector(adapter->dev, 0), adapter); 1215 pci_free_irq_vectors(adapter->dev); 1216} 1217 1218static void pvscsi_release_resources(struct pvscsi_adapter *adapter) 1219{ 1220 if (adapter->workqueue) 1221 destroy_workqueue(adapter->workqueue); 1222 1223 if (adapter->mmioBase) 1224 pci_iounmap(adapter->dev, adapter->mmioBase); 1225 1226 pci_release_regions(adapter->dev); 1227 1228 if (adapter->cmd_map) { 1229 pvscsi_free_sgls(adapter); 1230 kfree(adapter->cmd_map); 1231 } 1232 1233 if (adapter->rings_state) 1234 dma_free_coherent(&adapter->dev->dev, PAGE_SIZE, 1235 adapter->rings_state, adapter->ringStatePA); 1236 1237 if (adapter->req_ring) 1238 dma_free_coherent(&adapter->dev->dev, 1239 adapter->req_pages * PAGE_SIZE, 1240 adapter->req_ring, adapter->reqRingPA); 1241 1242 if (adapter->cmp_ring) 1243 dma_free_coherent(&adapter->dev->dev, 1244 adapter->cmp_pages * PAGE_SIZE, 1245 adapter->cmp_ring, adapter->cmpRingPA); 1246 1247 if (adapter->msg_ring) 1248 dma_free_coherent(&adapter->dev->dev, 1249 adapter->msg_pages * PAGE_SIZE, 1250 adapter->msg_ring, adapter->msgRingPA); 1251} 1252 1253/* 1254 * Allocate scatter gather lists. 1255 * 1256 * These are statically allocated. Trying to be clever was not worth it. 1257 * 1258 * Dynamic allocation can fail, and we can't go deep into the memory 1259 * allocator, since we're a SCSI driver, and trying too hard to allocate 1260 * memory might generate disk I/O. We also don't want to fail disk I/O 1261 * in that case because we can't get an allocation - the I/O could be 1262 * trying to swap out data to free memory. Since that is pathological, 1263 * just use a statically allocated scatter list. 1264 * 1265 */ 1266static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) 1267{ 1268 struct pvscsi_ctx *ctx; 1269 int i; 1270 1271 ctx = adapter->cmd_map; 1272 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); 1273 1274 for (i = 0; i < adapter->req_depth; ++i, ++ctx) { 1275 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, 1276 get_order(SGL_SIZE)); 1277 ctx->sglPA = 0; 1278 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); 1279 if (!ctx->sgl) { 1280 for (; i >= 0; --i, --ctx) { 1281 free_pages((unsigned long)ctx->sgl, 1282 get_order(SGL_SIZE)); 1283 ctx->sgl = NULL; 1284 } 1285 return -ENOMEM; 1286 } 1287 } 1288 1289 return 0; 1290} 1291 1292/* 1293 * Query the device, fetch the config info and return the 1294 * maximum number of targets on the adapter. In case of 1295 * failure due to any reason return default i.e. 16. 1296 */ 1297static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) 1298{ 1299 struct PVSCSICmdDescConfigCmd cmd; 1300 struct PVSCSIConfigPageHeader *header; 1301 struct device *dev; 1302 dma_addr_t configPagePA; 1303 void *config_page; 1304 u32 numPhys = 16; 1305 1306 dev = pvscsi_dev(adapter); 1307 config_page = dma_alloc_coherent(&adapter->dev->dev, PAGE_SIZE, 1308 &configPagePA, GFP_KERNEL); 1309 if (!config_page) { 1310 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n"); 1311 goto exit; 1312 } 1313 BUG_ON(configPagePA & ~PAGE_MASK); 1314 1315 /* Fetch config info from the device. */ 1316 cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; 1317 cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; 1318 cmd.cmpAddr = configPagePA; 1319 cmd._pad = 0; 1320 1321 /* 1322 * Mark the completion page header with error values. If the device 1323 * completes the command successfully, it sets the status values to 1324 * indicate success. 1325 */ 1326 header = config_page; 1327 header->hostStatus = BTSTAT_INVPARAM; 1328 header->scsiStatus = SDSTAT_CHECK; 1329 1330 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd); 1331 1332 if (header->hostStatus == BTSTAT_SUCCESS && 1333 header->scsiStatus == SDSTAT_GOOD) { 1334 struct PVSCSIConfigPageController *config; 1335 1336 config = config_page; 1337 numPhys = config->numPhys; 1338 } else 1339 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n", 1340 header->hostStatus, header->scsiStatus); 1341 dma_free_coherent(&adapter->dev->dev, PAGE_SIZE, config_page, 1342 configPagePA); 1343exit: 1344 return numPhys; 1345} 1346 1347static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1348{ 1349 unsigned int irq_flag = PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY; 1350 struct pvscsi_adapter *adapter; 1351 struct pvscsi_adapter adapter_temp; 1352 struct Scsi_Host *host = NULL; 1353 unsigned int i; 1354 int error; 1355 u32 max_id; 1356 1357 error = -ENODEV; 1358 1359 if (pci_enable_device(pdev)) 1360 return error; 1361 1362 if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) { 1363 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); 1364 } else if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) { 1365 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); 1366 } else { 1367 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); 1368 goto out_disable_device; 1369 } 1370 1371 /* 1372 * Let's use a temp pvscsi_adapter struct until we find the number of 1373 * targets on the adapter, after that we will switch to the real 1374 * allocated struct. 1375 */ 1376 adapter = &adapter_temp; 1377 memset(adapter, 0, sizeof(*adapter)); 1378 adapter->dev = pdev; 1379 adapter->rev = pdev->revision; 1380 1381 if (pci_request_regions(pdev, "vmw_pvscsi")) { 1382 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); 1383 goto out_disable_device; 1384 } 1385 1386 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 1387 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) 1388 continue; 1389 1390 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) 1391 continue; 1392 1393 break; 1394 } 1395 1396 if (i == DEVICE_COUNT_RESOURCE) { 1397 printk(KERN_ERR 1398 "vmw_pvscsi: adapter has no suitable MMIO region\n"); 1399 goto out_release_resources_and_disable; 1400 } 1401 1402 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); 1403 1404 if (!adapter->mmioBase) { 1405 printk(KERN_ERR 1406 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", 1407 i, PVSCSI_MEM_SPACE_SIZE); 1408 goto out_release_resources_and_disable; 1409 } 1410 1411 pci_set_master(pdev); 1412 1413 /* 1414 * Ask the device for max number of targets before deciding the 1415 * default pvscsi_ring_pages value. 1416 */ 1417 max_id = pvscsi_get_max_targets(adapter); 1418 printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id); 1419 1420 if (pvscsi_ring_pages == 0) 1421 /* 1422 * Set the right default value. Up to 16 it is 8, above it is 1423 * max. 1424 */ 1425 pvscsi_ring_pages = (max_id > 16) ? 1426 PVSCSI_SETUP_RINGS_MAX_NUM_PAGES : 1427 PVSCSI_DEFAULT_NUM_PAGES_PER_RING; 1428 printk(KERN_INFO 1429 "vmw_pvscsi: setting ring_pages to %d\n", 1430 pvscsi_ring_pages); 1431 1432 pvscsi_template.can_queue = 1433 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * 1434 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; 1435 pvscsi_template.cmd_per_lun = 1436 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); 1437 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); 1438 if (!host) { 1439 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); 1440 goto out_release_resources_and_disable; 1441 } 1442 1443 /* 1444 * Let's use the real pvscsi_adapter struct here onwards. 1445 */ 1446 adapter = shost_priv(host); 1447 memset(adapter, 0, sizeof(*adapter)); 1448 adapter->dev = pdev; 1449 adapter->host = host; 1450 /* 1451 * Copy back what we already have to the allocated adapter struct. 1452 */ 1453 adapter->rev = adapter_temp.rev; 1454 adapter->mmioBase = adapter_temp.mmioBase; 1455 1456 spin_lock_init(&adapter->hw_lock); 1457 host->max_channel = 0; 1458 host->max_lun = 1; 1459 host->max_cmd_len = 16; 1460 host->max_id = max_id; 1461 1462 pci_set_drvdata(pdev, host); 1463 1464 ll_adapter_reset(adapter); 1465 1466 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); 1467 1468 error = pvscsi_allocate_rings(adapter); 1469 if (error) { 1470 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); 1471 goto out_release_resources; 1472 } 1473 1474 /* 1475 * From this point on we should reset the adapter if anything goes 1476 * wrong. 1477 */ 1478 pvscsi_setup_all_rings(adapter); 1479 1480 adapter->cmd_map = kcalloc(adapter->req_depth, 1481 sizeof(struct pvscsi_ctx), GFP_KERNEL); 1482 if (!adapter->cmd_map) { 1483 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); 1484 error = -ENOMEM; 1485 goto out_reset_adapter; 1486 } 1487 1488 INIT_LIST_HEAD(&adapter->cmd_pool); 1489 for (i = 0; i < adapter->req_depth; i++) { 1490 struct pvscsi_ctx *ctx = adapter->cmd_map + i; 1491 list_add(&ctx->list, &adapter->cmd_pool); 1492 } 1493 1494 error = pvscsi_allocate_sg(adapter); 1495 if (error) { 1496 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); 1497 goto out_reset_adapter; 1498 } 1499 1500 if (pvscsi_disable_msix) 1501 irq_flag &= ~PCI_IRQ_MSIX; 1502 if (pvscsi_disable_msi) 1503 irq_flag &= ~PCI_IRQ_MSI; 1504 1505 error = pci_alloc_irq_vectors(adapter->dev, 1, 1, irq_flag); 1506 if (error < 0) 1507 goto out_reset_adapter; 1508 1509 adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true); 1510 printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n", 1511 adapter->use_req_threshold ? "en" : "dis"); 1512 1513 if (adapter->dev->msix_enabled || adapter->dev->msi_enabled) { 1514 printk(KERN_INFO "vmw_pvscsi: using MSI%s\n", 1515 adapter->dev->msix_enabled ? "-X" : ""); 1516 error = request_irq(pci_irq_vector(pdev, 0), pvscsi_isr, 1517 0, "vmw_pvscsi", adapter); 1518 } else { 1519 printk(KERN_INFO "vmw_pvscsi: using INTx\n"); 1520 error = request_irq(pci_irq_vector(pdev, 0), pvscsi_shared_isr, 1521 IRQF_SHARED, "vmw_pvscsi", adapter); 1522 } 1523 1524 if (error) { 1525 printk(KERN_ERR 1526 "vmw_pvscsi: unable to request IRQ: %d\n", error); 1527 goto out_reset_adapter; 1528 } 1529 1530 error = scsi_add_host(host, &pdev->dev); 1531 if (error) { 1532 printk(KERN_ERR 1533 "vmw_pvscsi: scsi_add_host failed: %d\n", error); 1534 goto out_reset_adapter; 1535 } 1536 1537 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", 1538 adapter->rev, host->host_no); 1539 1540 pvscsi_unmask_intr(adapter); 1541 1542 scsi_scan_host(host); 1543 1544 return 0; 1545 1546out_reset_adapter: 1547 ll_adapter_reset(adapter); 1548out_release_resources: 1549 pvscsi_shutdown_intr(adapter); 1550 pvscsi_release_resources(adapter); 1551 scsi_host_put(host); 1552out_disable_device: 1553 pci_disable_device(pdev); 1554 1555 return error; 1556 1557out_release_resources_and_disable: 1558 pvscsi_shutdown_intr(adapter); 1559 pvscsi_release_resources(adapter); 1560 goto out_disable_device; 1561} 1562 1563static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) 1564{ 1565 pvscsi_mask_intr(adapter); 1566 1567 if (adapter->workqueue) 1568 flush_workqueue(adapter->workqueue); 1569 1570 pvscsi_shutdown_intr(adapter); 1571 1572 pvscsi_process_request_ring(adapter); 1573 pvscsi_process_completion_ring(adapter); 1574 ll_adapter_reset(adapter); 1575} 1576 1577static void pvscsi_shutdown(struct pci_dev *dev) 1578{ 1579 struct Scsi_Host *host = pci_get_drvdata(dev); 1580 struct pvscsi_adapter *adapter = shost_priv(host); 1581 1582 __pvscsi_shutdown(adapter); 1583} 1584 1585static void pvscsi_remove(struct pci_dev *pdev) 1586{ 1587 struct Scsi_Host *host = pci_get_drvdata(pdev); 1588 struct pvscsi_adapter *adapter = shost_priv(host); 1589 1590 scsi_remove_host(host); 1591 1592 __pvscsi_shutdown(adapter); 1593 pvscsi_release_resources(adapter); 1594 1595 scsi_host_put(host); 1596 1597 pci_disable_device(pdev); 1598} 1599 1600static struct pci_driver pvscsi_pci_driver = { 1601 .name = "vmw_pvscsi", 1602 .id_table = pvscsi_pci_tbl, 1603 .probe = pvscsi_probe, 1604 .remove = pvscsi_remove, 1605 .shutdown = pvscsi_shutdown, 1606}; 1607 1608static int __init pvscsi_init(void) 1609{ 1610 pr_info("%s - version %s\n", 1611 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); 1612 return pci_register_driver(&pvscsi_pci_driver); 1613} 1614 1615static void __exit pvscsi_exit(void) 1616{ 1617 pci_unregister_driver(&pvscsi_pci_driver); 1618} 1619 1620module_init(pvscsi_init); 1621module_exit(pvscsi_exit); 1622