2 * Linux driver for VMware's para-virtualized SCSI HBA.
4 * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved.
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.
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
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.
20 * Maintained by: Arvind Kumar <arvindkumar@vmware.com>
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>
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>
37 #include "vmw_pvscsi.h"
39 #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
41 MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
42 MODULE_AUTHOR("VMware, Inc.");
43 MODULE_LICENSE("GPL");
44 MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
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
51 struct pvscsi_sg_list {
52 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
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.
60 struct scsi_cmnd *cmd;
61 struct pvscsi_sg_list *sgl;
62 struct list_head list;
66 struct completion *abort_cmp;
69 struct pvscsi_adapter {
76 bool use_req_threshold;
80 struct workqueue_struct *workqueue;
81 struct work_struct work;
83 struct PVSCSIRingReqDesc *req_ring;
88 struct PVSCSIRingCmpDesc *cmp_ring;
92 struct PVSCSIRingMsgDesc *msg_ring;
96 struct PVSCSIRingsState *rings_state;
97 dma_addr_t ringStatePA;
100 struct Scsi_Host *host;
102 struct list_head cmd_pool;
103 struct pvscsi_ctx *cmd_map;
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;
116 #define PVSCSI_RW (S_IRUSR | S_IWUSR)
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])");
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) ")");
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) ")");
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)");
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)");
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)");
142 module_param_named(use_req_threshold, pvscsi_use_req_threshold,
144 MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)");
146 static const struct pci_device_id pvscsi_pci_tbl[] = {
147 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
151 MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
153 static struct device *
154 pvscsi_dev(const struct pvscsi_adapter *adapter)
156 return &(adapter->dev->dev);
159 static struct pvscsi_ctx *
160 pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
162 struct pvscsi_ctx *ctx, *end;
164 end = &adapter->cmd_map[adapter->req_depth];
165 for (ctx = adapter->cmd_map; ctx < end; ctx++)
172 static struct pvscsi_ctx *
173 pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
175 struct pvscsi_ctx *ctx;
177 if (list_empty(&adapter->cmd_pool))
180 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
182 list_del(&ctx->list);
187 static void pvscsi_release_context(struct pvscsi_adapter *adapter,
188 struct pvscsi_ctx *ctx)
191 ctx->abort_cmp = NULL;
192 list_add(&ctx->list, &adapter->cmd_pool);
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.
200 static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
201 const struct pvscsi_ctx *ctx)
203 return ctx - adapter->cmd_map + 1;
206 static struct pvscsi_ctx *
207 pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
209 return &adapter->cmd_map[context - 1];
212 static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
215 writel(val, adapter->mmioBase + offset);
218 static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
220 return readl(adapter->mmioBase + offset);
223 static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
225 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
228 static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
231 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
234 static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
238 intr_bits = PVSCSI_INTR_CMPL_MASK;
239 if (adapter->use_msg)
240 intr_bits |= PVSCSI_INTR_MSG_MASK;
242 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
245 static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
247 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
250 static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
251 u32 cmd, const void *desc, size_t len)
253 const u32 *ptr = desc;
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]);
263 static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
264 const struct pvscsi_ctx *ctx)
266 struct PVSCSICmdDescAbortCmd cmd = { 0 };
268 cmd.target = ctx->cmd->device->id;
269 cmd.context = pvscsi_map_context(adapter, ctx);
271 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
274 static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
276 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
279 static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
281 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
284 static int scsi_is_rw(unsigned char op)
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;
292 static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
295 if (scsi_is_rw(op)) {
296 struct PVSCSIRingsState *s = adapter->rings_state;
298 if (!adapter->use_req_threshold ||
299 s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold)
300 pvscsi_kick_rw_io(adapter);
302 pvscsi_process_request_ring(adapter);
306 static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
308 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
310 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
313 static void ll_bus_reset(const struct pvscsi_adapter *adapter)
315 dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter);
317 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
320 static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
322 struct PVSCSICmdDescResetDevice cmd = { 0 };
324 dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target);
328 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
332 static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
333 struct scatterlist *sg, unsigned count)
336 struct PVSCSISGElement *sge;
338 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
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);
349 * Map all data buffers for a command into PCI space and
350 * setup the scatter/gather list if needed.
352 static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
353 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
354 struct PVSCSIRingReqDesc *e)
357 unsigned bufflen = scsi_bufflen(cmd);
358 struct scatterlist *sg;
360 e->dataLen = bufflen;
365 sg = scsi_sglist(cmd);
366 count = scsi_sg_count(cmd);
368 int segs = scsi_dma_map(cmd);
370 pvscsi_create_sg(ctx, sg, segs);
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;
377 e->dataAddr = sg_dma_address(sg);
380 * In case there is no S/G list, scsi_sglist points
381 * directly to the buffer.
383 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
384 cmd->sc_data_direction);
385 e->dataAddr = ctx->dataPA;
389 static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
390 struct pvscsi_ctx *ctx)
392 struct scsi_cmnd *cmd;
396 bufflen = scsi_bufflen(cmd);
399 unsigned count = scsi_sg_count(cmd);
404 pci_unmap_single(adapter->dev, ctx->sglPA,
405 SGL_SIZE, PCI_DMA_TODEVICE);
409 pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
410 cmd->sc_data_direction);
412 if (cmd->sense_buffer)
413 pci_unmap_single(adapter->dev, ctx->sensePA,
414 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
417 static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
419 adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
420 &adapter->ringStatePA);
421 if (!adapter->rings_state)
424 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
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)
434 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
436 adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
437 adapter->cmp_pages * PAGE_SIZE,
438 &adapter->cmpRingPA);
439 if (!adapter->cmp_ring)
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));
446 if (!adapter->use_msg)
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)
456 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
461 static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
463 struct PVSCSICmdDescSetupRings cmd = { 0 };
467 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT;
468 cmd.reqRingNumPages = adapter->req_pages;
469 cmd.cmpRingNumPages = adapter->cmp_pages;
471 base = adapter->reqRingPA;
472 for (i = 0; i < adapter->req_pages; i++) {
473 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
477 base = adapter->cmpRingPA;
478 for (i = 0; i < adapter->cmp_pages; i++) {
479 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
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);
487 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
490 if (adapter->use_msg) {
491 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
493 cmd_msg.numPages = adapter->msg_pages;
495 base = adapter->msgRingPA;
496 for (i = 0; i < adapter->msg_pages; i++) {
497 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
500 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
502 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
503 &cmd_msg, sizeof(cmd_msg));
507 static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
509 if (!sdev->tagged_supported)
511 return scsi_change_queue_depth(sdev, qdepth);
515 * Pull a completion descriptor off and pass the completion back
516 * to the SCSI mid layer.
518 static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
519 const struct PVSCSIRingCmpDesc *e)
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;
527 ctx = pvscsi_get_context(adapter, e->context);
529 abort_cmp = ctx->abort_cmp;
530 pvscsi_unmap_buffers(adapter, ctx);
531 pvscsi_release_context(adapter, ctx);
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.
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 if (sdstat == SAM_STAT_COMMAND_TERMINATED) {
549 cmd->result = (DID_RESET << 16);
551 cmd->result = (DID_OK << 16) | sdstat;
552 if (sdstat == SAM_STAT_CHECK_CONDITION &&
554 cmd->result |= (DRIVER_SENSE << 24);
559 case BTSTAT_LINKED_COMMAND_COMPLETED:
560 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
562 * Commands like INQUIRY may transfer less data than
563 * requested by the initiator via bufflen. Set residual
564 * count to make upper layer aware of the actual amount
567 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
568 cmd->result = (DID_OK << 16);
572 case BTSTAT_DATA_UNDERRUN:
573 /* Report residual data in underruns */
574 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
575 cmd->result = (DID_ERROR << 16);
578 case BTSTAT_SELTIMEO:
579 /* Our emulation returns this for non-connected devs */
580 cmd->result = (DID_BAD_TARGET << 16);
583 case BTSTAT_LUNMISMATCH:
584 case BTSTAT_TAGREJECT:
586 cmd->result = (DRIVER_INVALID << 24);
589 case BTSTAT_HAHARDWARE:
590 case BTSTAT_INVPHASE:
591 case BTSTAT_HATIMEOUT:
592 case BTSTAT_NORESPONSE:
593 case BTSTAT_DISCONNECT:
594 case BTSTAT_HASOFTWARE:
596 case BTSTAT_SENSFAILED:
597 cmd->result |= (DID_ERROR << 16);
602 case BTSTAT_BUSRESET:
603 cmd->result = (DID_RESET << 16);
606 case BTSTAT_ABORTQUEUE:
607 cmd->result = (DID_ABORT << 16);
610 case BTSTAT_SCSIPARITY:
611 cmd->result = (DID_PARITY << 16);
615 cmd->result = (DID_ERROR << 16);
616 scmd_printk(KERN_DEBUG, cmd,
617 "Unknown completion status: 0x%x\n",
621 dev_dbg(&cmd->device->sdev_gendev,
622 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
623 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
629 * barrier usage : Since the PVSCSI device is emulated, there could be cases
630 * where we may want to serialize some accesses between the driver and the
631 * emulation layer. We use compiler barriers instead of the more expensive
632 * memory barriers because PVSCSI is only supported on X86 which has strong
633 * memory access ordering.
635 static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
637 struct PVSCSIRingsState *s = adapter->rings_state;
638 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
639 u32 cmp_entries = s->cmpNumEntriesLog2;
641 while (s->cmpConsIdx != s->cmpProdIdx) {
642 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
645 * This barrier() ensures that *e is not dereferenced while
646 * the device emulation still writes data into the slot.
647 * Since the device emulation advances s->cmpProdIdx only after
648 * updating the slot we want to check it first.
651 pvscsi_complete_request(adapter, e);
653 * This barrier() ensures that compiler doesn't reorder write
654 * to s->cmpConsIdx before the read of (*e) inside
655 * pvscsi_complete_request. Otherwise, device emulation may
656 * overwrite *e before we had a chance to read it.
664 * Translate a Linux SCSI request into a request ring entry.
666 static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
667 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
669 struct PVSCSIRingsState *s;
670 struct PVSCSIRingReqDesc *e;
671 struct scsi_device *sdev;
674 s = adapter->rings_state;
676 req_entries = s->reqNumEntriesLog2;
679 * If this condition holds, we might have room on the request ring, but
680 * we might not have room on the completion ring for the response.
681 * However, we have already ruled out this possibility - we would not
682 * have successfully allocated a context if it were true, since we only
683 * have one context per request entry. Check for it anyway, since it
684 * would be a serious bug.
686 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
687 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
688 "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
689 s->reqProdIdx, s->cmpConsIdx);
693 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
695 e->bus = sdev->channel;
696 e->target = sdev->id;
697 memset(e->lun, 0, sizeof(e->lun));
698 e->lun[1] = sdev->lun;
700 if (cmd->sense_buffer) {
701 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
702 SCSI_SENSE_BUFFERSIZE,
704 e->senseAddr = ctx->sensePA;
705 e->senseLen = SCSI_SENSE_BUFFERSIZE;
710 e->cdbLen = cmd->cmd_len;
711 e->vcpuHint = smp_processor_id();
712 memcpy(e->cdb, cmd->cmnd, e->cdbLen);
714 e->tag = SIMPLE_QUEUE_TAG;
716 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
717 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
718 else if (cmd->sc_data_direction == DMA_TO_DEVICE)
719 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
720 else if (cmd->sc_data_direction == DMA_NONE)
721 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
725 pvscsi_map_buffers(adapter, ctx, cmd, e);
727 e->context = pvscsi_map_context(adapter, ctx);
736 static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
738 struct Scsi_Host *host = cmd->device->host;
739 struct pvscsi_adapter *adapter = shost_priv(host);
740 struct pvscsi_ctx *ctx;
744 spin_lock_irqsave(&adapter->hw_lock, flags);
746 ctx = pvscsi_acquire_context(adapter, cmd);
747 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
749 pvscsi_release_context(adapter, ctx);
750 spin_unlock_irqrestore(&adapter->hw_lock, flags);
751 return SCSI_MLQUEUE_HOST_BUSY;
754 cmd->scsi_done = done;
757 dev_dbg(&cmd->device->sdev_gendev,
758 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, op);
760 spin_unlock_irqrestore(&adapter->hw_lock, flags);
762 pvscsi_kick_io(adapter, op);
767 static DEF_SCSI_QCMD(pvscsi_queue)
769 static int pvscsi_abort(struct scsi_cmnd *cmd)
771 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
772 struct pvscsi_ctx *ctx;
774 int result = SUCCESS;
775 DECLARE_COMPLETION_ONSTACK(abort_cmp);
777 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
778 adapter->host->host_no, cmd);
780 spin_lock_irqsave(&adapter->hw_lock, flags);
783 * Poll the completion ring first - we might be trying to abort
784 * a command that is waiting to be dispatched in the completion ring.
786 pvscsi_process_completion_ring(adapter);
789 * If there is no context for the command, it either already succeeded
790 * or else was never properly issued. Not our problem.
792 ctx = pvscsi_find_context(adapter, cmd);
794 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
799 * Mark that the command has been requested to be aborted and issue
802 ctx->abort_cmp = &abort_cmp;
804 pvscsi_abort_cmd(adapter, ctx);
805 spin_unlock_irqrestore(&adapter->hw_lock, flags);
806 /* Wait for 2 secs for the completion. */
807 wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
808 spin_lock_irqsave(&adapter->hw_lock, flags);
810 if (!completion_done(&abort_cmp)) {
812 * Failed to abort the command, unmark the fact that it
813 * was requested to be aborted.
815 ctx->abort_cmp = NULL;
817 scmd_printk(KERN_DEBUG, cmd,
818 "Failed to get completion for aborted cmd %p\n",
824 * Successfully aborted the command.
826 cmd->result = (DID_ABORT << 16);
830 spin_unlock_irqrestore(&adapter->hw_lock, flags);
835 * Abort all outstanding requests. This is only safe to use if the completion
836 * ring will never be walked again or the device has been reset, because it
837 * destroys the 1-1 mapping between context field passed to emulation and our
840 static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
844 for (i = 0; i < adapter->req_depth; i++) {
845 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
846 struct scsi_cmnd *cmd = ctx->cmd;
848 scmd_printk(KERN_ERR, cmd,
849 "Forced reset on cmd %p\n", cmd);
850 pvscsi_unmap_buffers(adapter, ctx);
851 pvscsi_release_context(adapter, ctx);
852 cmd->result = (DID_RESET << 16);
858 static int pvscsi_host_reset(struct scsi_cmnd *cmd)
860 struct Scsi_Host *host = cmd->device->host;
861 struct pvscsi_adapter *adapter = shost_priv(host);
865 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
867 spin_lock_irqsave(&adapter->hw_lock, flags);
869 use_msg = adapter->use_msg;
872 adapter->use_msg = 0;
873 spin_unlock_irqrestore(&adapter->hw_lock, flags);
876 * Now that we know that the ISR won't add more work on the
877 * workqueue we can safely flush any outstanding work.
879 flush_workqueue(adapter->workqueue);
880 spin_lock_irqsave(&adapter->hw_lock, flags);
884 * We're going to tear down the entire ring structure and set it back
885 * up, so stalling new requests until all completions are flushed and
886 * the rings are back in place.
889 pvscsi_process_request_ring(adapter);
891 ll_adapter_reset(adapter);
894 * Now process any completions. Note we do this AFTER adapter reset,
895 * which is strange, but stops races where completions get posted
896 * between processing the ring and issuing the reset. The backend will
897 * not touch the ring memory after reset, so the immediately pre-reset
898 * completion ring state is still valid.
900 pvscsi_process_completion_ring(adapter);
902 pvscsi_reset_all(adapter);
903 adapter->use_msg = use_msg;
904 pvscsi_setup_all_rings(adapter);
905 pvscsi_unmask_intr(adapter);
907 spin_unlock_irqrestore(&adapter->hw_lock, flags);
912 static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
914 struct Scsi_Host *host = cmd->device->host;
915 struct pvscsi_adapter *adapter = shost_priv(host);
918 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
921 * We don't want to queue new requests for this bus after
922 * flushing all pending requests to emulation, since new
923 * requests could then sneak in during this bus reset phase,
924 * so take the lock now.
926 spin_lock_irqsave(&adapter->hw_lock, flags);
928 pvscsi_process_request_ring(adapter);
929 ll_bus_reset(adapter);
930 pvscsi_process_completion_ring(adapter);
932 spin_unlock_irqrestore(&adapter->hw_lock, flags);
937 static int pvscsi_device_reset(struct scsi_cmnd *cmd)
939 struct Scsi_Host *host = cmd->device->host;
940 struct pvscsi_adapter *adapter = shost_priv(host);
943 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
944 host->host_no, cmd->device->id);
947 * We don't want to queue new requests for this device after flushing
948 * all pending requests to emulation, since new requests could then
949 * sneak in during this device reset phase, so take the lock now.
951 spin_lock_irqsave(&adapter->hw_lock, flags);
953 pvscsi_process_request_ring(adapter);
954 ll_device_reset(adapter, cmd->device->id);
955 pvscsi_process_completion_ring(adapter);
957 spin_unlock_irqrestore(&adapter->hw_lock, flags);
962 static struct scsi_host_template pvscsi_template;
964 static const char *pvscsi_info(struct Scsi_Host *host)
966 struct pvscsi_adapter *adapter = shost_priv(host);
967 static char buf[256];
969 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
970 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
971 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
972 pvscsi_template.cmd_per_lun);
977 static struct scsi_host_template pvscsi_template = {
978 .module = THIS_MODULE,
979 .name = "VMware PVSCSI Host Adapter",
980 .proc_name = "vmw_pvscsi",
982 .queuecommand = pvscsi_queue,
984 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
985 .dma_boundary = UINT_MAX,
986 .max_sectors = 0xffff,
987 .use_clustering = ENABLE_CLUSTERING,
988 .change_queue_depth = pvscsi_change_queue_depth,
989 .eh_abort_handler = pvscsi_abort,
990 .eh_device_reset_handler = pvscsi_device_reset,
991 .eh_bus_reset_handler = pvscsi_bus_reset,
992 .eh_host_reset_handler = pvscsi_host_reset,
995 static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
996 const struct PVSCSIRingMsgDesc *e)
998 struct PVSCSIRingsState *s = adapter->rings_state;
999 struct Scsi_Host *host = adapter->host;
1000 struct scsi_device *sdev;
1002 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
1003 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
1005 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
1007 if (e->type == PVSCSI_MSG_DEV_ADDED) {
1008 struct PVSCSIMsgDescDevStatusChanged *desc;
1009 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
1012 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
1013 desc->bus, desc->target, desc->lun[1]);
1015 if (!scsi_host_get(host))
1018 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1021 printk(KERN_INFO "vmw_pvscsi: device already exists\n");
1022 scsi_device_put(sdev);
1024 scsi_add_device(adapter->host, desc->bus,
1025 desc->target, desc->lun[1]);
1027 scsi_host_put(host);
1028 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
1029 struct PVSCSIMsgDescDevStatusChanged *desc;
1030 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
1033 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
1034 desc->bus, desc->target, desc->lun[1]);
1036 if (!scsi_host_get(host))
1039 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1042 scsi_remove_device(sdev);
1043 scsi_device_put(sdev);
1046 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
1047 desc->bus, desc->target, desc->lun[1]);
1049 scsi_host_put(host);
1053 static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
1055 struct PVSCSIRingsState *s = adapter->rings_state;
1057 return s->msgProdIdx != s->msgConsIdx;
1060 static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
1062 struct PVSCSIRingsState *s = adapter->rings_state;
1063 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
1064 u32 msg_entries = s->msgNumEntriesLog2;
1066 while (pvscsi_msg_pending(adapter)) {
1067 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
1071 pvscsi_process_msg(adapter, e);
1077 static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1079 struct pvscsi_adapter *adapter;
1081 adapter = container_of(data, struct pvscsi_adapter, work);
1083 pvscsi_process_msg_ring(adapter);
1086 static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1090 if (!pvscsi_use_msg)
1093 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1094 PVSCSI_CMD_SETUP_MSG_RING);
1096 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1099 snprintf(name, sizeof(name),
1100 "vmw_pvscsi_wq_%u", adapter->host->host_no);
1102 adapter->workqueue = create_singlethread_workqueue(name);
1103 if (!adapter->workqueue) {
1104 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1107 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1112 static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter,
1117 if (!pvscsi_use_req_threshold)
1120 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1121 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD);
1122 val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS);
1124 printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n");
1127 struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 };
1128 cmd_msg.enable = enable;
1130 "vmw_pvscsi: %sabling reqCallThreshold\n",
1131 enable ? "en" : "dis");
1132 pvscsi_write_cmd_desc(adapter,
1133 PVSCSI_CMD_SETUP_REQCALLTHRESHOLD,
1134 &cmd_msg, sizeof(cmd_msg));
1135 return pvscsi_reg_read(adapter,
1136 PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0;
1140 static irqreturn_t pvscsi_isr(int irq, void *devp)
1142 struct pvscsi_adapter *adapter = devp;
1145 if (adapter->use_msi || adapter->use_msix)
1148 u32 val = pvscsi_read_intr_status(adapter);
1149 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1151 pvscsi_write_intr_status(devp, val);
1155 unsigned long flags;
1157 spin_lock_irqsave(&adapter->hw_lock, flags);
1159 pvscsi_process_completion_ring(adapter);
1160 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1161 queue_work(adapter->workqueue, &adapter->work);
1163 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1166 return IRQ_RETVAL(handled);
1169 static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1171 struct pvscsi_ctx *ctx = adapter->cmd_map;
1174 for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1175 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1178 static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1181 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1184 ret = pci_enable_msix_exact(adapter->dev, &entry, 1);
1188 *irq = entry.vector;
1193 static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1196 free_irq(adapter->irq, adapter);
1199 if (adapter->use_msi) {
1200 pci_disable_msi(adapter->dev);
1201 adapter->use_msi = 0;
1202 } else if (adapter->use_msix) {
1203 pci_disable_msix(adapter->dev);
1204 adapter->use_msix = 0;
1208 static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1210 if (adapter->workqueue)
1211 destroy_workqueue(adapter->workqueue);
1213 if (adapter->mmioBase)
1214 pci_iounmap(adapter->dev, adapter->mmioBase);
1216 pci_release_regions(adapter->dev);
1218 if (adapter->cmd_map) {
1219 pvscsi_free_sgls(adapter);
1220 kfree(adapter->cmd_map);
1223 if (adapter->rings_state)
1224 pci_free_consistent(adapter->dev, PAGE_SIZE,
1225 adapter->rings_state, adapter->ringStatePA);
1227 if (adapter->req_ring)
1228 pci_free_consistent(adapter->dev,
1229 adapter->req_pages * PAGE_SIZE,
1230 adapter->req_ring, adapter->reqRingPA);
1232 if (adapter->cmp_ring)
1233 pci_free_consistent(adapter->dev,
1234 adapter->cmp_pages * PAGE_SIZE,
1235 adapter->cmp_ring, adapter->cmpRingPA);
1237 if (adapter->msg_ring)
1238 pci_free_consistent(adapter->dev,
1239 adapter->msg_pages * PAGE_SIZE,
1240 adapter->msg_ring, adapter->msgRingPA);
1244 * Allocate scatter gather lists.
1246 * These are statically allocated. Trying to be clever was not worth it.
1248 * Dynamic allocation can fail, and we can't go deep into the memory
1249 * allocator, since we're a SCSI driver, and trying too hard to allocate
1250 * memory might generate disk I/O. We also don't want to fail disk I/O
1251 * in that case because we can't get an allocation - the I/O could be
1252 * trying to swap out data to free memory. Since that is pathological,
1253 * just use a statically allocated scatter list.
1256 static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1258 struct pvscsi_ctx *ctx;
1261 ctx = adapter->cmd_map;
1262 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1264 for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1265 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1266 get_order(SGL_SIZE));
1268 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1270 for (; i >= 0; --i, --ctx) {
1271 free_pages((unsigned long)ctx->sgl,
1272 get_order(SGL_SIZE));
1283 * Query the device, fetch the config info and return the
1284 * maximum number of targets on the adapter. In case of
1285 * failure due to any reason return default i.e. 16.
1287 static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)
1289 struct PVSCSICmdDescConfigCmd cmd;
1290 struct PVSCSIConfigPageHeader *header;
1292 dma_addr_t configPagePA;
1296 dev = pvscsi_dev(adapter);
1297 config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
1300 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n");
1303 BUG_ON(configPagePA & ~PAGE_MASK);
1305 /* Fetch config info from the device. */
1306 cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32;
1307 cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;
1308 cmd.cmpAddr = configPagePA;
1312 * Mark the completion page header with error values. If the device
1313 * completes the command successfully, it sets the status values to
1316 header = config_page;
1317 memset(header, 0, sizeof *header);
1318 header->hostStatus = BTSTAT_INVPARAM;
1319 header->scsiStatus = SDSTAT_CHECK;
1321 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd);
1323 if (header->hostStatus == BTSTAT_SUCCESS &&
1324 header->scsiStatus == SDSTAT_GOOD) {
1325 struct PVSCSIConfigPageController *config;
1327 config = config_page;
1328 numPhys = config->numPhys;
1330 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n",
1331 header->hostStatus, header->scsiStatus);
1332 pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA);
1337 static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1339 struct pvscsi_adapter *adapter;
1340 struct pvscsi_adapter adapter_temp;
1341 struct Scsi_Host *host = NULL;
1343 unsigned long flags = 0;
1349 if (pci_enable_device(pdev))
1352 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1353 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1354 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1355 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1356 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1357 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1359 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1360 goto out_disable_device;
1364 * Let's use a temp pvscsi_adapter struct until we find the number of
1365 * targets on the adapter, after that we will switch to the real
1368 adapter = &adapter_temp;
1369 memset(adapter, 0, sizeof(*adapter));
1370 adapter->dev = pdev;
1371 adapter->rev = pdev->revision;
1373 if (pci_request_regions(pdev, "vmw_pvscsi")) {
1374 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1375 goto out_disable_device;
1378 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1379 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1382 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1388 if (i == DEVICE_COUNT_RESOURCE) {
1390 "vmw_pvscsi: adapter has no suitable MMIO region\n");
1391 goto out_release_resources_and_disable;
1394 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1396 if (!adapter->mmioBase) {
1398 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1399 i, PVSCSI_MEM_SPACE_SIZE);
1400 goto out_release_resources_and_disable;
1403 pci_set_master(pdev);
1406 * Ask the device for max number of targets before deciding the
1407 * default pvscsi_ring_pages value.
1409 max_id = pvscsi_get_max_targets(adapter);
1410 printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id);
1412 if (pvscsi_ring_pages == 0)
1414 * Set the right default value. Up to 16 it is 8, above it is
1417 pvscsi_ring_pages = (max_id > 16) ?
1418 PVSCSI_SETUP_RINGS_MAX_NUM_PAGES :
1419 PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
1421 "vmw_pvscsi: setting ring_pages to %d\n",
1424 pvscsi_template.can_queue =
1425 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1426 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1427 pvscsi_template.cmd_per_lun =
1428 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1429 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1431 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1432 goto out_release_resources_and_disable;
1436 * Let's use the real pvscsi_adapter struct here onwards.
1438 adapter = shost_priv(host);
1439 memset(adapter, 0, sizeof(*adapter));
1440 adapter->dev = pdev;
1441 adapter->host = host;
1443 * Copy back what we already have to the allocated adapter struct.
1445 adapter->rev = adapter_temp.rev;
1446 adapter->mmioBase = adapter_temp.mmioBase;
1448 spin_lock_init(&adapter->hw_lock);
1449 host->max_channel = 0;
1451 host->max_cmd_len = 16;
1452 host->max_id = max_id;
1454 pci_set_drvdata(pdev, host);
1456 ll_adapter_reset(adapter);
1458 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1460 error = pvscsi_allocate_rings(adapter);
1462 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1463 goto out_release_resources;
1467 * From this point on we should reset the adapter if anything goes
1470 pvscsi_setup_all_rings(adapter);
1472 adapter->cmd_map = kcalloc(adapter->req_depth,
1473 sizeof(struct pvscsi_ctx), GFP_KERNEL);
1474 if (!adapter->cmd_map) {
1475 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1477 goto out_reset_adapter;
1480 INIT_LIST_HEAD(&adapter->cmd_pool);
1481 for (i = 0; i < adapter->req_depth; i++) {
1482 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1483 list_add(&ctx->list, &adapter->cmd_pool);
1486 error = pvscsi_allocate_sg(adapter);
1488 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1489 goto out_reset_adapter;
1492 if (!pvscsi_disable_msix &&
1493 pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1494 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1495 adapter->use_msix = 1;
1496 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1497 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1498 adapter->use_msi = 1;
1499 adapter->irq = pdev->irq;
1501 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1502 adapter->irq = pdev->irq;
1503 flags = IRQF_SHARED;
1506 adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true);
1507 printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n",
1508 adapter->use_req_threshold ? "en" : "dis");
1510 error = request_irq(adapter->irq, pvscsi_isr, flags,
1511 "vmw_pvscsi", adapter);
1514 "vmw_pvscsi: unable to request IRQ: %d\n", error);
1516 goto out_reset_adapter;
1519 error = scsi_add_host(host, &pdev->dev);
1522 "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1523 goto out_reset_adapter;
1526 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1527 adapter->rev, host->host_no);
1529 pvscsi_unmask_intr(adapter);
1531 scsi_scan_host(host);
1536 ll_adapter_reset(adapter);
1537 out_release_resources:
1538 pvscsi_shutdown_intr(adapter);
1539 pvscsi_release_resources(adapter);
1540 scsi_host_put(host);
1542 pci_disable_device(pdev);
1546 out_release_resources_and_disable:
1547 pvscsi_shutdown_intr(adapter);
1548 pvscsi_release_resources(adapter);
1549 goto out_disable_device;
1552 static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1554 pvscsi_mask_intr(adapter);
1556 if (adapter->workqueue)
1557 flush_workqueue(adapter->workqueue);
1559 pvscsi_shutdown_intr(adapter);
1561 pvscsi_process_request_ring(adapter);
1562 pvscsi_process_completion_ring(adapter);
1563 ll_adapter_reset(adapter);
1566 static void pvscsi_shutdown(struct pci_dev *dev)
1568 struct Scsi_Host *host = pci_get_drvdata(dev);
1569 struct pvscsi_adapter *adapter = shost_priv(host);
1571 __pvscsi_shutdown(adapter);
1574 static void pvscsi_remove(struct pci_dev *pdev)
1576 struct Scsi_Host *host = pci_get_drvdata(pdev);
1577 struct pvscsi_adapter *adapter = shost_priv(host);
1579 scsi_remove_host(host);
1581 __pvscsi_shutdown(adapter);
1582 pvscsi_release_resources(adapter);
1584 scsi_host_put(host);
1586 pci_disable_device(pdev);
1589 static struct pci_driver pvscsi_pci_driver = {
1590 .name = "vmw_pvscsi",
1591 .id_table = pvscsi_pci_tbl,
1592 .probe = pvscsi_probe,
1593 .remove = pvscsi_remove,
1594 .shutdown = pvscsi_shutdown,
1597 static int __init pvscsi_init(void)
1599 pr_info("%s - version %s\n",
1600 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1601 return pci_register_driver(&pvscsi_pci_driver);
1604 static void __exit pvscsi_exit(void)
1606 pci_unregister_driver(&pvscsi_pci_driver);
1609 module_init(pvscsi_init);
1610 module_exit(pvscsi_exit);