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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...
[net-next-2.6.git] / drivers / scsi / vmw_pvscsi.c
CommitLineData
851b1642
AK		 1/*
2 * Linux driver for VMware's para-virtualized SCSI HBA.
3 *
4 * Copyright (C) 2008-2009, 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: Alok N Kataria <akataria@vmware.com>
21 *
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/interrupt.h>
5a0e3ad6 27#include <linux/slab.h>
851b1642
AK		 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
36#include "vmw_pvscsi.h"
37
38#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
39
40MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
41MODULE_AUTHOR("VMware, Inc.");
42MODULE_LICENSE("GPL");
43MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
44
45#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
46#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
47#define PVSCSI_DEFAULT_QUEUE_DEPTH 64
48#define SGL_SIZE PAGE_SIZE
49
50struct pvscsi_sg_list {
51 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
52};
53
54struct pvscsi_ctx {
55 /*
56 * The index of the context in cmd_map serves as the context ID for a
57 * 1-to-1 mapping completions back to requests.
58 */
59 struct scsi_cmnd *cmd;
60 struct pvscsi_sg_list *sgl;
61 struct list_head list;
62 dma_addr_t dataPA;
63 dma_addr_t sensePA;
64 dma_addr_t sglPA;
65};
66
67struct pvscsi_adapter {
68 char *mmioBase;
69 unsigned int irq;
70 u8 rev;
71 bool use_msi;
72 bool use_msix;
73 bool use_msg;
74
75 spinlock_t hw_lock;
76
77 struct workqueue_struct *workqueue;
78 struct work_struct work;
79
80 struct PVSCSIRingReqDesc *req_ring;
81 unsigned req_pages;
82 unsigned req_depth;
83 dma_addr_t reqRingPA;
84
85 struct PVSCSIRingCmpDesc *cmp_ring;
86 unsigned cmp_pages;
87 dma_addr_t cmpRingPA;
88
89 struct PVSCSIRingMsgDesc *msg_ring;
90 unsigned msg_pages;
91 dma_addr_t msgRingPA;
92
93 struct PVSCSIRingsState *rings_state;
94 dma_addr_t ringStatePA;
95
96 struct pci_dev *dev;
97 struct Scsi_Host *host;
98
99 struct list_head cmd_pool;
100 struct pvscsi_ctx *cmd_map;
101};
102
103
104/* Command line parameters */
105static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
106static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
107static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
108static bool pvscsi_disable_msi;
109static bool pvscsi_disable_msix;
110static bool pvscsi_use_msg = true;
111
112#define PVSCSI_RW (S_IRUSR | S_IWUSR)
113
114module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
115MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
116 __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")");
117
118module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
119MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
120 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
121
122module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
123MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
124 __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
125
126module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
127MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
128
129module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
130MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
131
132module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
133MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
134
135static const struct pci_device_id pvscsi_pci_tbl[] = {
136 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
137 { 0 }
138};
139
140MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
141
142static struct device *
143pvscsi_dev(const struct pvscsi_adapter *adapter)
144{
145 return &(adapter->dev->dev);
146}
147
148static struct pvscsi_ctx *
149pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
150{
151 struct pvscsi_ctx *ctx, *end;
152
153 end = &adapter->cmd_map[adapter->req_depth];
154 for (ctx = adapter->cmd_map; ctx < end; ctx++)
155 if (ctx->cmd == cmd)
156 return ctx;
157
158 return NULL;
159}
160
161static struct pvscsi_ctx *
162pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
163{
164 struct pvscsi_ctx *ctx;
165
166 if (list_empty(&adapter->cmd_pool))
167 return NULL;
168
169 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
170 ctx->cmd = cmd;
171 list_del(&ctx->list);
172
173 return ctx;
174}
175
176static void pvscsi_release_context(struct pvscsi_adapter *adapter,
177 struct pvscsi_ctx *ctx)
178{
179 ctx->cmd = NULL;
180 list_add(&ctx->list, &adapter->cmd_pool);
181}
182
183/*
184 * Map a pvscsi_ctx struct to a context ID field value; we map to a simple
185 * non-zero integer. ctx always points to an entry in cmd_map array, hence
186 * the return value is always >=1.
187 */
188static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
189 const struct pvscsi_ctx *ctx)
190{
191 return ctx - adapter->cmd_map + 1;
192}
193
194static struct pvscsi_ctx *
195pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
196{
197 return &adapter->cmd_map[context - 1];
198}
199
200static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
201 u32 offset, u32 val)
202{
203 writel(val, adapter->mmioBase + offset);
204}
205
206static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
207{
208 return readl(adapter->mmioBase + offset);
209}
210
211static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
212{
213 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
214}
215
216static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
217 u32 val)
218{
219 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
220}
221
222static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
223{
224 u32 intr_bits;
225
226 intr_bits = PVSCSI_INTR_CMPL_MASK;
227 if (adapter->use_msg)
228 intr_bits |= PVSCSI_INTR_MSG_MASK;
229
230 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
231}
232
233static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
234{
235 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
236}
237
238static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
239 u32 cmd, const void *desc, size_t len)
240{
241 const u32 *ptr = desc;
242 size_t i;
243
244 len /= sizeof(*ptr);
245 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
246 for (i = 0; i < len; i++)
247 pvscsi_reg_write(adapter,
248 PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
249}
250
251static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
252 const struct pvscsi_ctx *ctx)
253{
254 struct PVSCSICmdDescAbortCmd cmd = { 0 };
255
256 cmd.target = ctx->cmd->device->id;
257 cmd.context = pvscsi_map_context(adapter, ctx);
258
259 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
260}
261
262static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
263{
264 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
265}
266
267static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
268{
269 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
270}
271
272static int scsi_is_rw(unsigned char op)
273{
274 return op == READ_6 || op == WRITE_6 ||
275 op == READ_10 || op == WRITE_10 ||
276 op == READ_12 || op == WRITE_12 ||
277 op == READ_16 || op == WRITE_16;
278}
279
280static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
281 unsigned char op)
282{
283 if (scsi_is_rw(op))
284 pvscsi_kick_rw_io(adapter);
285 else
286 pvscsi_process_request_ring(adapter);
287}
288
289static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
290{
291 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
292
293 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
294}
295
296static void ll_bus_reset(const struct pvscsi_adapter *adapter)
297{
298 dev_dbg(pvscsi_dev(adapter), "Reseting bus on %p\n", adapter);
299
300 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
301}
302
303static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
304{
305 struct PVSCSICmdDescResetDevice cmd = { 0 };
306
307 dev_dbg(pvscsi_dev(adapter), "Reseting device: target=%u\n", target);
308
309 cmd.target = target;
310
311 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
312 &cmd, sizeof(cmd));
313}
314
315static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
316 struct scatterlist *sg, unsigned count)
317{
318 unsigned i;
319 struct PVSCSISGElement *sge;
320
321 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
322
323 sge = &ctx->sgl->sge[0];
324 for (i = 0; i < count; i++, sg++) {
325 sge[i].addr = sg_dma_address(sg);
326 sge[i].length = sg_dma_len(sg);
327 sge[i].flags = 0;
328 }
329}
330
331/*
332 * Map all data buffers for a command into PCI space and
333 * setup the scatter/gather list if needed.
334 */
335static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
336 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
337 struct PVSCSIRingReqDesc *e)
338{
339 unsigned count;
340 unsigned bufflen = scsi_bufflen(cmd);
341 struct scatterlist *sg;
342
343 e->dataLen = bufflen;
344 e->dataAddr = 0;
345 if (bufflen == 0)
346 return;
347
348 sg = scsi_sglist(cmd);
349 count = scsi_sg_count(cmd);
350 if (count != 0) {
351 int segs = scsi_dma_map(cmd);
352 if (segs > 1) {
353 pvscsi_create_sg(ctx, sg, segs);
354
355 e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
356 ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
357 SGL_SIZE, PCI_DMA_TODEVICE);
358 e->dataAddr = ctx->sglPA;
359 } else
360 e->dataAddr = sg_dma_address(sg);
361 } else {
362 /*
363 * In case there is no S/G list, scsi_sglist points
364 * directly to the buffer.
365 */
366 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
367 cmd->sc_data_direction);
368 e->dataAddr = ctx->dataPA;
369 }
370}
371
372static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
373 struct pvscsi_ctx *ctx)
374{
375 struct scsi_cmnd *cmd;
376 unsigned bufflen;
377
378 cmd = ctx->cmd;
379 bufflen = scsi_bufflen(cmd);
380
381 if (bufflen != 0) {
382 unsigned count = scsi_sg_count(cmd);
383
384 if (count != 0) {
385 scsi_dma_unmap(cmd);
386 if (ctx->sglPA) {
387 pci_unmap_single(adapter->dev, ctx->sglPA,
388 SGL_SIZE, PCI_DMA_TODEVICE);
389 ctx->sglPA = 0;
390 }
391 } else
392 pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
393 cmd->sc_data_direction);
394 }
395 if (cmd->sense_buffer)
396 pci_unmap_single(adapter->dev, ctx->sensePA,
397 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
398}
399
400static int __devinit pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
401{
402 adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
403 &adapter->ringStatePA);
404 if (!adapter->rings_state)
405 return -ENOMEM;
406
407 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
408 pvscsi_ring_pages);
409 adapter->req_depth = adapter->req_pages
410 * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
411 adapter->req_ring = pci_alloc_consistent(adapter->dev,
412 adapter->req_pages * PAGE_SIZE,
413 &adapter->reqRingPA);
414 if (!adapter->req_ring)
415 return -ENOMEM;
416
417 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
418 pvscsi_ring_pages);
419 adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
420 adapter->cmp_pages * PAGE_SIZE,
421 &adapter->cmpRingPA);
422 if (!adapter->cmp_ring)
423 return -ENOMEM;
424
425 BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE));
426 BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE));
427 BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE));
428
429 if (!adapter->use_msg)
430 return 0;
431
432 adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING,
433 pvscsi_msg_ring_pages);
434 adapter->msg_ring = pci_alloc_consistent(adapter->dev,
435 adapter->msg_pages * PAGE_SIZE,
436 &adapter->msgRingPA);
437 if (!adapter->msg_ring)
438 return -ENOMEM;
439 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
440
441 return 0;
442}
443
444static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
445{
446 struct PVSCSICmdDescSetupRings cmd = { 0 };
447 dma_addr_t base;
448 unsigned i;
449
450 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT;
451 cmd.reqRingNumPages = adapter->req_pages;
452 cmd.cmpRingNumPages = adapter->cmp_pages;
453
454 base = adapter->reqRingPA;
455 for (i = 0; i < adapter->req_pages; i++) {
456 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
457 base += PAGE_SIZE;
458 }
459
460 base = adapter->cmpRingPA;
461 for (i = 0; i < adapter->cmp_pages; i++) {
462 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
463 base += PAGE_SIZE;
464 }
465
466 memset(adapter->rings_state, 0, PAGE_SIZE);
467 memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE);
468 memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE);
469
470 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
471 &cmd, sizeof(cmd));
472
473 if (adapter->use_msg) {
474 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
475
476 cmd_msg.numPages = adapter->msg_pages;
477
478 base = adapter->msgRingPA;
479 for (i = 0; i < adapter->msg_pages; i++) {
480 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
481 base += PAGE_SIZE;
482 }
483 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
484
485 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
486 &cmd_msg, sizeof(cmd_msg));
487 }
488}
489
490/*
491 * Pull a completion descriptor off and pass the completion back
492 * to the SCSI mid layer.
493 */
494static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
495 const struct PVSCSIRingCmpDesc *e)
496{
497 struct pvscsi_ctx *ctx;
498 struct scsi_cmnd *cmd;
499 u32 btstat = e->hostStatus;
500 u32 sdstat = e->scsiStatus;
501
502 ctx = pvscsi_get_context(adapter, e->context);
503 cmd = ctx->cmd;
504 pvscsi_unmap_buffers(adapter, ctx);
505 pvscsi_release_context(adapter, ctx);
506 cmd->result = 0;
507
508 if (sdstat != SAM_STAT_GOOD &&
509 (btstat == BTSTAT_SUCCESS ||
510 btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
511 btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
512 cmd->result = (DID_OK << 16) | sdstat;
513 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
514 cmd->result |= (DRIVER_SENSE << 24);
515 } else
516 switch (btstat) {
517 case BTSTAT_SUCCESS:
518 case BTSTAT_LINKED_COMMAND_COMPLETED:
519 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
520 /* If everything went fine, let's move on.. */
521 cmd->result = (DID_OK << 16);
522 break;
523
524 case BTSTAT_DATARUN:
525 case BTSTAT_DATA_UNDERRUN:
526 /* Report residual data in underruns */
527 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
528 cmd->result = (DID_ERROR << 16);
529 break;
530
531 case BTSTAT_SELTIMEO:
532 /* Our emulation returns this for non-connected devs */
533 cmd->result = (DID_BAD_TARGET << 16);
534 break;
535
536 case BTSTAT_LUNMISMATCH:
537 case BTSTAT_TAGREJECT:
538 case BTSTAT_BADMSG:
539 cmd->result = (DRIVER_INVALID << 24);
540 /* fall through */
541
542 case BTSTAT_HAHARDWARE:
543 case BTSTAT_INVPHASE:
544 case BTSTAT_HATIMEOUT:
545 case BTSTAT_NORESPONSE:
546 case BTSTAT_DISCONNECT:
547 case BTSTAT_HASOFTWARE:
548 case BTSTAT_BUSFREE:
549 case BTSTAT_SENSFAILED:
550 cmd->result |= (DID_ERROR << 16);
551 break;
552
553 case BTSTAT_SENTRST:
554 case BTSTAT_RECVRST:
555 case BTSTAT_BUSRESET:
556 cmd->result = (DID_RESET << 16);
557 break;
558
559 case BTSTAT_ABORTQUEUE:
560 cmd->result = (DID_ABORT << 16);
561 break;
562
563 case BTSTAT_SCSIPARITY:
564 cmd->result = (DID_PARITY << 16);
565 break;
566
567 default:
568 cmd->result = (DID_ERROR << 16);
569 scmd_printk(KERN_DEBUG, cmd,
570 "Unknown completion status: 0x%x\n",
571 btstat);
572 }
573
574 dev_dbg(&cmd->device->sdev_gendev,
575 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
576 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
577
578 cmd->scsi_done(cmd);
579}
580
581/*
582 * barrier usage : Since the PVSCSI device is emulated, there could be cases
583 * where we may want to serialize some accesses between the driver and the
584 * emulation layer. We use compiler barriers instead of the more expensive
585 * memory barriers because PVSCSI is only supported on X86 which has strong
586 * memory access ordering.
587 */
588static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
589{
590 struct PVSCSIRingsState *s = adapter->rings_state;
591 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
592 u32 cmp_entries = s->cmpNumEntriesLog2;
593
594 while (s->cmpConsIdx != s->cmpProdIdx) {
595 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
596 MASK(cmp_entries));
597 /*
598 * This barrier() ensures that *e is not dereferenced while
599 * the device emulation still writes data into the slot.
600 * Since the device emulation advances s->cmpProdIdx only after
601 * updating the slot we want to check it first.
602 */
603 barrier();
604 pvscsi_complete_request(adapter, e);
605 /*
606 * This barrier() ensures that compiler doesn't reorder write
607 * to s->cmpConsIdx before the read of (*e) inside
608 * pvscsi_complete_request. Otherwise, device emulation may
609 * overwrite *e before we had a chance to read it.
610 */
611 barrier();
612 s->cmpConsIdx++;
613 }
614}
615
616/*
617 * Translate a Linux SCSI request into a request ring entry.
618 */
619static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
620 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
621{
622 struct PVSCSIRingsState *s;
623 struct PVSCSIRingReqDesc *e;
624 struct scsi_device *sdev;
625 u32 req_entries;
626
627 s = adapter->rings_state;
628 sdev = cmd->device;
629 req_entries = s->reqNumEntriesLog2;
630
631 /*
632 * If this condition holds, we might have room on the request ring, but
633 * we might not have room on the completion ring for the response.
634 * However, we have already ruled out this possibility - we would not
635 * have successfully allocated a context if it were true, since we only
636 * have one context per request entry. Check for it anyway, since it
637 * would be a serious bug.
638 */
639 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
640 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
641 "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
642 s->reqProdIdx, s->cmpConsIdx);
643 return -1;
644 }
645
646 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
647
648 e->bus = sdev->channel;
649 e->target = sdev->id;
650 memset(e->lun, 0, sizeof(e->lun));
651 e->lun[1] = sdev->lun;
652
653 if (cmd->sense_buffer) {
654 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
655 SCSI_SENSE_BUFFERSIZE,
656 PCI_DMA_FROMDEVICE);
657 e->senseAddr = ctx->sensePA;
658 e->senseLen = SCSI_SENSE_BUFFERSIZE;
659 } else {
660 e->senseLen = 0;
661 e->senseAddr = 0;
662 }
663 e->cdbLen = cmd->cmd_len;
664 e->vcpuHint = smp_processor_id();
665 memcpy(e->cdb, cmd->cmnd, e->cdbLen);
666
667 e->tag = SIMPLE_QUEUE_TAG;
668 if (sdev->tagged_supported &&
669 (cmd->tag == HEAD_OF_QUEUE_TAG ||
670 cmd->tag == ORDERED_QUEUE_TAG))
671 e->tag = cmd->tag;
672
673 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
674 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
675 else if (cmd->sc_data_direction == DMA_TO_DEVICE)
676 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
677 else if (cmd->sc_data_direction == DMA_NONE)
678 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
679 else
680 e->flags = 0;
681
682 pvscsi_map_buffers(adapter, ctx, cmd, e);
683
684 e->context = pvscsi_map_context(adapter, ctx);
685
686 barrier();
687
688 s->reqProdIdx++;
689
690 return 0;
691}
692
693static int pvscsi_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
694{
695 struct Scsi_Host *host = cmd->device->host;
696 struct pvscsi_adapter *adapter = shost_priv(host);
697 struct pvscsi_ctx *ctx;
698 unsigned long flags;
699
700 spin_lock_irqsave(&adapter->hw_lock, flags);
701
702 ctx = pvscsi_acquire_context(adapter, cmd);
703 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
704 if (ctx)
705 pvscsi_release_context(adapter, ctx);
706 spin_unlock_irqrestore(&adapter->hw_lock, flags);
707 return SCSI_MLQUEUE_HOST_BUSY;
708 }
709
710 cmd->scsi_done = done;
711
712 dev_dbg(&cmd->device->sdev_gendev,
713 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
714
715 spin_unlock_irqrestore(&adapter->hw_lock, flags);
716
717 pvscsi_kick_io(adapter, cmd->cmnd[0]);
718
719 return 0;
720}
721
722static int pvscsi_abort(struct scsi_cmnd *cmd)
723{
724 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
725 struct pvscsi_ctx *ctx;
726 unsigned long flags;
727
728 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
729 adapter->host->host_no, cmd);
730
731 spin_lock_irqsave(&adapter->hw_lock, flags);
732
733 /*
734 * Poll the completion ring first - we might be trying to abort
735 * a command that is waiting to be dispatched in the completion ring.
736 */
737 pvscsi_process_completion_ring(adapter);
738
739 /*
740 * If there is no context for the command, it either already succeeded
741 * or else was never properly issued. Not our problem.
742 */
743 ctx = pvscsi_find_context(adapter, cmd);
744 if (!ctx) {
745 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
746 goto out;
747 }
748
749 pvscsi_abort_cmd(adapter, ctx);
750
751 pvscsi_process_completion_ring(adapter);
752
753out:
754 spin_unlock_irqrestore(&adapter->hw_lock, flags);
755 return SUCCESS;
756}
757
758/*
759 * Abort all outstanding requests. This is only safe to use if the completion
760 * ring will never be walked again or the device has been reset, because it
761 * destroys the 1-1 mapping between context field passed to emulation and our
762 * request structure.
763 */
764static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
765{
766 unsigned i;
767
768 for (i = 0; i < adapter->req_depth; i++) {
769 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
770 struct scsi_cmnd *cmd = ctx->cmd;
771 if (cmd) {
772 scmd_printk(KERN_ERR, cmd,
773 "Forced reset on cmd %p\n", cmd);
774 pvscsi_unmap_buffers(adapter, ctx);
775 pvscsi_release_context(adapter, ctx);
776 cmd->result = (DID_RESET << 16);
777 cmd->scsi_done(cmd);
778 }
779 }
780}
781
782static int pvscsi_host_reset(struct scsi_cmnd *cmd)
783{
784 struct Scsi_Host *host = cmd->device->host;
785 struct pvscsi_adapter *adapter = shost_priv(host);
786 unsigned long flags;
787 bool use_msg;
788
789 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
790
791 spin_lock_irqsave(&adapter->hw_lock, flags);
792
793 use_msg = adapter->use_msg;
794
795 if (use_msg) {
796 adapter->use_msg = 0;
797 spin_unlock_irqrestore(&adapter->hw_lock, flags);
798
799 /*
800 * Now that we know that the ISR won't add more work on the
801 * workqueue we can safely flush any outstanding work.
802 */
803 flush_workqueue(adapter->workqueue);
804 spin_lock_irqsave(&adapter->hw_lock, flags);
805 }
806
807 /*
808 * We're going to tear down the entire ring structure and set it back
809 * up, so stalling new requests until all completions are flushed and
810 * the rings are back in place.
811 */
812
813 pvscsi_process_request_ring(adapter);
814
815 ll_adapter_reset(adapter);
816
817 /*
818 * Now process any completions. Note we do this AFTER adapter reset,
819 * which is strange, but stops races where completions get posted
820 * between processing the ring and issuing the reset. The backend will
821 * not touch the ring memory after reset, so the immediately pre-reset
822 * completion ring state is still valid.
823 */
824 pvscsi_process_completion_ring(adapter);
825
826 pvscsi_reset_all(adapter);
827 adapter->use_msg = use_msg;
828 pvscsi_setup_all_rings(adapter);
829 pvscsi_unmask_intr(adapter);
830
831 spin_unlock_irqrestore(&adapter->hw_lock, flags);
832
833 return SUCCESS;
834}
835
836static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
837{
838 struct Scsi_Host *host = cmd->device->host;
839 struct pvscsi_adapter *adapter = shost_priv(host);
840 unsigned long flags;
841
842 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
843
844 /*
845 * We don't want to queue new requests for this bus after
846 * flushing all pending requests to emulation, since new
847 * requests could then sneak in during this bus reset phase,
848 * so take the lock now.
849 */
850 spin_lock_irqsave(&adapter->hw_lock, flags);
851
852 pvscsi_process_request_ring(adapter);
853 ll_bus_reset(adapter);
854 pvscsi_process_completion_ring(adapter);
855
856 spin_unlock_irqrestore(&adapter->hw_lock, flags);
857
858 return SUCCESS;
859}
860
861static int pvscsi_device_reset(struct scsi_cmnd *cmd)
862{
863 struct Scsi_Host *host = cmd->device->host;
864 struct pvscsi_adapter *adapter = shost_priv(host);
865 unsigned long flags;
866
867 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
868 host->host_no, cmd->device->id);
869
870 /*
871 * We don't want to queue new requests for this device after flushing
872 * all pending requests to emulation, since new requests could then
873 * sneak in during this device reset phase, so take the lock now.
874 */
875 spin_lock_irqsave(&adapter->hw_lock, flags);
876
877 pvscsi_process_request_ring(adapter);
878 ll_device_reset(adapter, cmd->device->id);
879 pvscsi_process_completion_ring(adapter);
880
881 spin_unlock_irqrestore(&adapter->hw_lock, flags);
882
883 return SUCCESS;
884}
885
886static struct scsi_host_template pvscsi_template;
887
888static const char *pvscsi_info(struct Scsi_Host *host)
889{
890 struct pvscsi_adapter *adapter = shost_priv(host);
891 static char buf[256];
892
893 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
894 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
895 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
896 pvscsi_template.cmd_per_lun);
897
898 return buf;
899}
900
901static struct scsi_host_template pvscsi_template = {
902 .module = THIS_MODULE,
903 .name = "VMware PVSCSI Host Adapter",
904 .proc_name = "vmw_pvscsi",
905 .info = pvscsi_info,
906 .queuecommand = pvscsi_queue,
907 .this_id = -1,
908 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
909 .dma_boundary = UINT_MAX,
910 .max_sectors = 0xffff,
911 .use_clustering = ENABLE_CLUSTERING,
912 .eh_abort_handler = pvscsi_abort,
913 .eh_device_reset_handler = pvscsi_device_reset,
914 .eh_bus_reset_handler = pvscsi_bus_reset,
915 .eh_host_reset_handler = pvscsi_host_reset,
916};
917
918static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
919 const struct PVSCSIRingMsgDesc *e)
920{
921 struct PVSCSIRingsState *s = adapter->rings_state;
922 struct Scsi_Host *host = adapter->host;
923 struct scsi_device *sdev;
924
925 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
926 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
927
928 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
929
930 if (e->type == PVSCSI_MSG_DEV_ADDED) {
931 struct PVSCSIMsgDescDevStatusChanged *desc;
932 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
933
934 printk(KERN_INFO
935 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
936 desc->bus, desc->target, desc->lun[1]);
937
938 if (!scsi_host_get(host))
939 return;
940
941 sdev = scsi_device_lookup(host, desc->bus, desc->target,
942 desc->lun[1]);
943 if (sdev) {
944 printk(KERN_INFO "vmw_pvscsi: device already exists\n");
945 scsi_device_put(sdev);
946 } else
947 scsi_add_device(adapter->host, desc->bus,
948 desc->target, desc->lun[1]);
949
950 scsi_host_put(host);
951 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
952 struct PVSCSIMsgDescDevStatusChanged *desc;
953 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
954
955 printk(KERN_INFO
956 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
957 desc->bus, desc->target, desc->lun[1]);
958
959 if (!scsi_host_get(host))
960 return;
961
962 sdev = scsi_device_lookup(host, desc->bus, desc->target,
963 desc->lun[1]);
964 if (sdev) {
965 scsi_remove_device(sdev);
966 scsi_device_put(sdev);
967 } else
968 printk(KERN_INFO
969 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
970 desc->bus, desc->target, desc->lun[1]);
971
972 scsi_host_put(host);
973 }
974}
975
976static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
977{
978 struct PVSCSIRingsState *s = adapter->rings_state;
979
980 return s->msgProdIdx != s->msgConsIdx;
981}
982
983static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
984{
985 struct PVSCSIRingsState *s = adapter->rings_state;
986 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
987 u32 msg_entries = s->msgNumEntriesLog2;
988
989 while (pvscsi_msg_pending(adapter)) {
990 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
991 MASK(msg_entries));
992
993 barrier();
994 pvscsi_process_msg(adapter, e);
995 barrier();
996 s->msgConsIdx++;
997 }
998}
999
1000static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1001{
1002 struct pvscsi_adapter *adapter;
1003
1004 adapter = container_of(data, struct pvscsi_adapter, work);
1005
1006 pvscsi_process_msg_ring(adapter);
1007}
1008
1009static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1010{
1011 char name[32];
1012
1013 if (!pvscsi_use_msg)
1014 return 0;
1015
1016 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1017 PVSCSI_CMD_SETUP_MSG_RING);
1018
1019 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1020 return 0;
1021
1022 snprintf(name, sizeof(name),
1023 "vmw_pvscsi_wq_%u", adapter->host->host_no);
1024
1025 adapter->workqueue = create_singlethread_workqueue(name);
1026 if (!adapter->workqueue) {
1027 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1028 return 0;
1029 }
1030 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1031
1032 return 1;
1033}
1034
1035static irqreturn_t pvscsi_isr(int irq, void *devp)
1036{
1037 struct pvscsi_adapter *adapter = devp;
1038 int handled;
1039
1040 if (adapter->use_msi || adapter->use_msix)
1041 handled = true;
1042 else {
1043 u32 val = pvscsi_read_intr_status(adapter);
1044 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1045 if (handled)
1046 pvscsi_write_intr_status(devp, val);
1047 }
1048
1049 if (handled) {
1050 unsigned long flags;
1051
1052 spin_lock_irqsave(&adapter->hw_lock, flags);
1053
1054 pvscsi_process_completion_ring(adapter);
1055 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1056 queue_work(adapter->workqueue, &adapter->work);
1057
1058 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1059 }
1060
1061 return IRQ_RETVAL(handled);
1062}
1063
1064static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1065{
1066 struct pvscsi_ctx *ctx = adapter->cmd_map;
1067 unsigned i;
1068
1069 for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1070 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1071}
1072
d0e2ddff
DT		 1073static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1074 unsigned int *irq)
851b1642
AK		 1075{
1076 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1077 int ret;
1078
1079 ret = pci_enable_msix(adapter->dev, &entry, 1);
1080 if (ret)
1081 return ret;
1082
1083 *irq = entry.vector;
1084
1085 return 0;
1086}
1087
1088static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1089{
1090 if (adapter->irq) {
1091 free_irq(adapter->irq, adapter);
1092 adapter->irq = 0;
1093 }
1094 if (adapter->use_msi) {
1095 pci_disable_msi(adapter->dev);
1096 adapter->use_msi = 0;
1097 } else if (adapter->use_msix) {
1098 pci_disable_msix(adapter->dev);
1099 adapter->use_msix = 0;
1100 }
1101}
1102
1103static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1104{
1105 pvscsi_shutdown_intr(adapter);
1106
1107 if (adapter->workqueue)
1108 destroy_workqueue(adapter->workqueue);
1109
1110 if (adapter->mmioBase)
1111 pci_iounmap(adapter->dev, adapter->mmioBase);
1112
1113 pci_release_regions(adapter->dev);
1114
1115 if (adapter->cmd_map) {
1116 pvscsi_free_sgls(adapter);
1117 kfree(adapter->cmd_map);
1118 }
1119
1120 if (adapter->rings_state)
1121 pci_free_consistent(adapter->dev, PAGE_SIZE,
1122 adapter->rings_state, adapter->ringStatePA);
1123
1124 if (adapter->req_ring)
1125 pci_free_consistent(adapter->dev,
1126 adapter->req_pages * PAGE_SIZE,
1127 adapter->req_ring, adapter->reqRingPA);
1128
1129 if (adapter->cmp_ring)
1130 pci_free_consistent(adapter->dev,
1131 adapter->cmp_pages * PAGE_SIZE,
1132 adapter->cmp_ring, adapter->cmpRingPA);
1133
1134 if (adapter->msg_ring)
1135 pci_free_consistent(adapter->dev,
1136 adapter->msg_pages * PAGE_SIZE,
1137 adapter->msg_ring, adapter->msgRingPA);
1138}
1139
1140/*
1141 * Allocate scatter gather lists.
1142 *
1143 * These are statically allocated. Trying to be clever was not worth it.
1144 *
1145 * Dynamic allocation can fail, and we can't go deeep into the memory
1146 * allocator, since we're a SCSI driver, and trying too hard to allocate
1147 * memory might generate disk I/O. We also don't want to fail disk I/O
1148 * in that case because we can't get an allocation - the I/O could be
1149 * trying to swap out data to free memory. Since that is pathological,
1150 * just use a statically allocated scatter list.
1151 *
1152 */
1153static int __devinit pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1154{
1155 struct pvscsi_ctx *ctx;
1156 int i;
1157
1158 ctx = adapter->cmd_map;
1159 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1160
1161 for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1162 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1163 get_order(SGL_SIZE));
1164 ctx->sglPA = 0;
1165 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1166 if (!ctx->sgl) {
1167 for (; i >= 0; --i, --ctx) {
1168 free_pages((unsigned long)ctx->sgl,
1169 get_order(SGL_SIZE));
1170 ctx->sgl = NULL;
1171 }
1172 return -ENOMEM;
1173 }
1174 }
1175
1176 return 0;
1177}
1178
1179static int __devinit pvscsi_probe(struct pci_dev *pdev,
1180 const struct pci_device_id *id)
1181{
1182 struct pvscsi_adapter *adapter;
1183 struct Scsi_Host *host;
1184 unsigned int i;
1185 unsigned long flags = 0;
1186 int error;
1187
1188 error = -ENODEV;
1189
1190 if (pci_enable_device(pdev))
1191 return error;
1192
1193 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1194 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1195 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1196 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1197 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1198 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1199 } else {
1200 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1201 goto out_disable_device;
1202 }
1203
1204 pvscsi_template.can_queue =
1205 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1206 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1207 pvscsi_template.cmd_per_lun =
1208 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1209 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1210 if (!host) {
1211 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1212 goto out_disable_device;
1213 }
1214
1215 adapter = shost_priv(host);
1216 memset(adapter, 0, sizeof(*adapter));
1217 adapter->dev = pdev;
1218 adapter->host = host;
1219
1220 spin_lock_init(&adapter->hw_lock);
1221
1222 host->max_channel = 0;
1223 host->max_id = 16;
1224 host->max_lun = 1;
1225 host->max_cmd_len = 16;
1226
1227 adapter->rev = pdev->revision;
1228
1229 if (pci_request_regions(pdev, "vmw_pvscsi")) {
1230 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1231 goto out_free_host;
1232 }
1233
1234 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1235 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1236 continue;
1237
1238 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1239 continue;
1240
1241 break;
1242 }
1243
1244 if (i == DEVICE_COUNT_RESOURCE) {
1245 printk(KERN_ERR
1246 "vmw_pvscsi: adapter has no suitable MMIO region\n");
1247 goto out_release_resources;
1248 }
1249
1250 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1251
1252 if (!adapter->mmioBase) {
1253 printk(KERN_ERR
1254 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1255 i, PVSCSI_MEM_SPACE_SIZE);
1256 goto out_release_resources;
1257 }
1258
1259 pci_set_master(pdev);
1260 pci_set_drvdata(pdev, host);
1261
1262 ll_adapter_reset(adapter);
1263
1264 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1265
1266 error = pvscsi_allocate_rings(adapter);
1267 if (error) {
1268 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1269 goto out_release_resources;
1270 }
1271
1272 /*
1273 * From this point on we should reset the adapter if anything goes
1274 * wrong.
1275 */
1276 pvscsi_setup_all_rings(adapter);
1277
1278 adapter->cmd_map = kcalloc(adapter->req_depth,
1279 sizeof(struct pvscsi_ctx), GFP_KERNEL);
1280 if (!adapter->cmd_map) {
1281 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1282 error = -ENOMEM;
1283 goto out_reset_adapter;
1284 }
1285
1286 INIT_LIST_HEAD(&adapter->cmd_pool);
1287 for (i = 0; i < adapter->req_depth; i++) {
1288 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1289 list_add(&ctx->list, &adapter->cmd_pool);
1290 }
1291
1292 error = pvscsi_allocate_sg(adapter);
1293 if (error) {
1294 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1295 goto out_reset_adapter;
1296 }
1297
1298 if (!pvscsi_disable_msix &&
1299 pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1300 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1301 adapter->use_msix = 1;
1302 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1303 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1304 adapter->use_msi = 1;
1305 adapter->irq = pdev->irq;
1306 } else {
1307 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1308 adapter->irq = pdev->irq;
1309 flags = IRQF_SHARED;
1310 }
1311
1312 error = request_irq(adapter->irq, pvscsi_isr, flags,
1313 "vmw_pvscsi", adapter);
1314 if (error) {
1315 printk(KERN_ERR
1316 "vmw_pvscsi: unable to request IRQ: %d\n", error);
1317 adapter->irq = 0;
1318 goto out_reset_adapter;
1319 }
1320
1321 error = scsi_add_host(host, &pdev->dev);
1322 if (error) {
1323 printk(KERN_ERR
1324 "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1325 goto out_reset_adapter;
1326 }
1327
1328 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1329 adapter->rev, host->host_no);
1330
1331 pvscsi_unmask_intr(adapter);
1332
1333 scsi_scan_host(host);
1334
1335 return 0;
1336
1337out_reset_adapter:
1338 ll_adapter_reset(adapter);
1339out_release_resources:
1340 pvscsi_release_resources(adapter);
1341out_free_host:
1342 scsi_host_put(host);
1343out_disable_device:
1344 pci_set_drvdata(pdev, NULL);
1345 pci_disable_device(pdev);
1346
1347 return error;
1348}
1349
1350static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1351{
1352 pvscsi_mask_intr(adapter);
1353
1354 if (adapter->workqueue)
1355 flush_workqueue(adapter->workqueue);
1356
1357 pvscsi_shutdown_intr(adapter);
1358
1359 pvscsi_process_request_ring(adapter);
1360 pvscsi_process_completion_ring(adapter);
1361 ll_adapter_reset(adapter);
1362}
1363
1364static void pvscsi_shutdown(struct pci_dev *dev)
1365{
1366 struct Scsi_Host *host = pci_get_drvdata(dev);
1367 struct pvscsi_adapter *adapter = shost_priv(host);
1368
1369 __pvscsi_shutdown(adapter);
1370}
1371
1372static void pvscsi_remove(struct pci_dev *pdev)
1373{
1374 struct Scsi_Host *host = pci_get_drvdata(pdev);
1375 struct pvscsi_adapter *adapter = shost_priv(host);
1376
1377 scsi_remove_host(host);
1378
1379 __pvscsi_shutdown(adapter);
1380 pvscsi_release_resources(adapter);
1381
1382 scsi_host_put(host);
1383
1384 pci_set_drvdata(pdev, NULL);
1385 pci_disable_device(pdev);
1386}
1387
1388static struct pci_driver pvscsi_pci_driver = {
1389 .name = "vmw_pvscsi",
1390 .id_table = pvscsi_pci_tbl,
1391 .probe = pvscsi_probe,
1392 .remove = __devexit_p(pvscsi_remove),
1393 .shutdown = pvscsi_shutdown,
1394};
1395
1396static int __init pvscsi_init(void)
1397{
1398 pr_info("%s - version %s\n",
1399 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1400 return pci_register_driver(&pvscsi_pci_driver);
1401}
1402
1403static void __exit pvscsi_exit(void)
1404{
1405 pci_unregister_driver(&pvscsi_pci_driver);
1406}
1407
1408module_init(pvscsi_init);
1409module_exit(pvscsi_exit);
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