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authorAlok Kataria <akataria@vmware.com>2009-10-13 17:51:05 -0400
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 13:00:49 -0500
commit851b164231d1117673aa44c00c7622e48b7dfcf4 (patch)
treedd63a44d5865e788b4864b29d7a173e8aa2471ef /drivers/scsi/vmw_pvscsi.c
parent96e6586556dfa80112f42895be93c561582d9930 (diff)
[SCSI] vmw_pvscsi: SCSI driver for VMware's virtual HBA.
This is a driver for VMware's paravirtualized SCSI device, which should improve disk performance for guests running under control of VMware hypervisors that support such devices. Signed-off-by: Alok N Kataria <akataria@vmware.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/vmw_pvscsi.c')
-rw-r--r--drivers/scsi/vmw_pvscsi.c1407
1 files changed, 1407 insertions, 0 deletions
diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c
new file mode 100644
index 000000000000..d2604c813a20
--- /dev/null
+++ b/drivers/scsi/vmw_pvscsi.c
@@ -0,0 +1,1407 @@
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>
27#include <linux/workqueue.h>
28#include <linux/pci.h>
29
30#include <scsi/scsi.h>
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.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 64
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};
65
66struct pvscsi_adapter {
67 char *mmioBase;
68 unsigned int irq;
69 u8 rev;
70 bool use_msi;
71 bool use_msix;
72 bool use_msg;
73
74 spinlock_t hw_lock;
75
76 struct workqueue_struct *workqueue;
77 struct work_struct work;
78
79 struct PVSCSIRingReqDesc *req_ring;
80 unsigned req_pages;
81 unsigned req_depth;
82 dma_addr_t reqRingPA;
83
84 struct PVSCSIRingCmpDesc *cmp_ring;
85 unsigned cmp_pages;
86 dma_addr_t cmpRingPA;
87
88 struct PVSCSIRingMsgDesc *msg_ring;
89 unsigned msg_pages;
90 dma_addr_t msgRingPA;
91
92 struct PVSCSIRingsState *rings_state;
93 dma_addr_t ringStatePA;
94
95 struct pci_dev *dev;
96 struct Scsi_Host *host;
97
98 struct list_head cmd_pool;
99 struct pvscsi_ctx *cmd_map;
100};
101
102
103/* Command line parameters */
104static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
105static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
106static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
107static bool pvscsi_disable_msi;
108static bool pvscsi_disable_msix;
109static bool pvscsi_use_msg = 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
117module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
118MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
119 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
120
121module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
122MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
123 __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
124
125module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
126MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
127
128module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
129MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
130
131module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
132MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
133
134static const struct pci_device_id pvscsi_pci_tbl[] = {
135 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
136 { 0 }
137};
138
139MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
140
141static struct device *
142pvscsi_dev(const struct pvscsi_adapter *adapter)
143{
144 return &(adapter->dev->dev);
145}
146
147static struct pvscsi_ctx *
148pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
149{
150 struct pvscsi_ctx *ctx, *end;
151
152 end = &adapter->cmd_map[adapter->req_depth];
153 for (ctx = adapter->cmd_map; ctx < end; ctx++)
154 if (ctx->cmd == cmd)
155 return ctx;
156
157 return NULL;
158}
159
160static struct pvscsi_ctx *
161pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
162{
163 struct pvscsi_ctx *ctx;
164
165 if (list_empty(&adapter->cmd_pool))
166 return NULL;
167
168 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
169 ctx->cmd = cmd;
170 list_del(&ctx->list);
171
172 return ctx;
173}
174
175static void pvscsi_release_context(struct pvscsi_adapter *adapter,
176 struct pvscsi_ctx *ctx)
177{
178 ctx->cmd = NULL;
179 list_add(&ctx->list, &adapter->cmd_pool);
180}
181
182/*
183 * Map a pvscsi_ctx struct to a context ID field value; we map to a simple
184 * non-zero integer. ctx always points to an entry in cmd_map array, hence
185 * the return value is always >=1.
186 */
187static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
188 const struct pvscsi_ctx *ctx)
189{
190 return ctx - adapter->cmd_map + 1;
191}
192
193static struct pvscsi_ctx *
194pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
195{
196 return &adapter->cmd_map[context - 1];
197}
198
199static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
200 u32 offset, u32 val)
201{
202 writel(val, adapter->mmioBase + offset);
203}
204
205static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
206{
207 return readl(adapter->mmioBase + offset);
208}
209
210static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
211{
212 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
213}
214
215static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
216 u32 val)
217{
218 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
219}
220
221static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
222{
223 u32 intr_bits;
224
225 intr_bits = PVSCSI_INTR_CMPL_MASK;
226 if (adapter->use_msg)
227 intr_bits |= PVSCSI_INTR_MSG_MASK;
228
229 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
230}
231
232static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
233{
234 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
235}
236
237static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
238 u32 cmd, const void *desc, size_t len)
239{
240 const u32 *ptr = desc;
241 size_t i;
242
243 len /= sizeof(*ptr);
244 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
245 for (i = 0; i < len; i++)
246 pvscsi_reg_write(adapter,
247 PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
248}
249
250static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
251 const struct pvscsi_ctx *ctx)
252{
253 struct PVSCSICmdDescAbortCmd cmd = { 0 };
254
255 cmd.target = ctx->cmd->device->id;
256 cmd.context = pvscsi_map_context(adapter, ctx);
257
258 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
259}
260
261static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
262{
263 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
264}
265
266static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
267{
268 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
269}
270
271static int scsi_is_rw(unsigned char op)
272{
273 return op == READ_6 || op == WRITE_6 ||
274 op == READ_10 || op == WRITE_10 ||
275 op == READ_12 || op == WRITE_12 ||
276 op == READ_16 || op == WRITE_16;
277}
278
279static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
280 unsigned char op)
281{
282 if (scsi_is_rw(op))
283 pvscsi_kick_rw_io(adapter);
284 else
285 pvscsi_process_request_ring(adapter);
286}
287
288static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
289{
290 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
291
292 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
293}
294
295static void ll_bus_reset(const struct pvscsi_adapter *adapter)
296{
297 dev_dbg(pvscsi_dev(adapter), "Reseting bus on %p\n", adapter);
298
299 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
300}
301
302static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
303{
304 struct PVSCSICmdDescResetDevice cmd = { 0 };
305
306 dev_dbg(pvscsi_dev(adapter), "Reseting device: target=%u\n", target);
307
308 cmd.target = target;
309
310 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
311 &cmd, sizeof(cmd));
312}
313
314static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
315 struct scatterlist *sg, unsigned count)
316{
317 unsigned i;
318 struct PVSCSISGElement *sge;
319
320 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
321
322 sge = &ctx->sgl->sge[0];
323 for (i = 0; i < count; i++, sg++) {
324 sge[i].addr = sg_dma_address(sg);
325 sge[i].length = sg_dma_len(sg);
326 sge[i].flags = 0;
327 }
328}
329
330/*
331 * Map all data buffers for a command into PCI space and
332 * setup the scatter/gather list if needed.
333 */
334static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
335 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
336 struct PVSCSIRingReqDesc *e)
337{
338 unsigned count;
339 unsigned bufflen = scsi_bufflen(cmd);
340 struct scatterlist *sg;
341
342 e->dataLen = bufflen;
343 e->dataAddr = 0;
344 if (bufflen == 0)
345 return;
346
347 sg = scsi_sglist(cmd);
348 count = scsi_sg_count(cmd);
349 if (count != 0) {
350 int segs = scsi_dma_map(cmd);
351 if (segs > 1) {
352 pvscsi_create_sg(ctx, sg, segs);
353
354 e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
355 ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
356 SGL_SIZE, PCI_DMA_TODEVICE);
357 e->dataAddr = ctx->sglPA;
358 } else
359 e->dataAddr = sg_dma_address(sg);
360 } else {
361 /*
362 * In case there is no S/G list, scsi_sglist points
363 * directly to the buffer.
364 */
365 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
366 cmd->sc_data_direction);
367 e->dataAddr = ctx->dataPA;
368 }
369}
370
371static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
372 struct pvscsi_ctx *ctx)
373{
374 struct scsi_cmnd *cmd;
375 unsigned bufflen;
376
377 cmd = ctx->cmd;
378 bufflen = scsi_bufflen(cmd);
379
380 if (bufflen != 0) {
381 unsigned count = scsi_sg_count(cmd);
382
383 if (count != 0) {
384 scsi_dma_unmap(cmd);
385 if (ctx->sglPA) {
386 pci_unmap_single(adapter->dev, ctx->sglPA,
387 SGL_SIZE, PCI_DMA_TODEVICE);
388 ctx->sglPA = 0;
389 }
390 } else
391 pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
392 cmd->sc_data_direction);
393 }
394 if (cmd->sense_buffer)
395 pci_unmap_single(adapter->dev, ctx->sensePA,
396 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
397}
398
399static int __devinit pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
400{
401 adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
402 &adapter->ringStatePA);
403 if (!adapter->rings_state)
404 return -ENOMEM;
405
406 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
407 pvscsi_ring_pages);
408 adapter->req_depth = adapter->req_pages
409 * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
410 adapter->req_ring = pci_alloc_consistent(adapter->dev,
411 adapter->req_pages * PAGE_SIZE,
412 &adapter->reqRingPA);
413 if (!adapter->req_ring)
414 return -ENOMEM;
415
416 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
417 pvscsi_ring_pages);
418 adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
419 adapter->cmp_pages * PAGE_SIZE,
420 &adapter->cmpRingPA);
421 if (!adapter->cmp_ring)
422 return -ENOMEM;
423
424 BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE));
425 BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE));
426 BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE));
427
428 if (!adapter->use_msg)
429 return 0;
430
431 adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING,
432 pvscsi_msg_ring_pages);
433 adapter->msg_ring = pci_alloc_consistent(adapter->dev,
434 adapter->msg_pages * PAGE_SIZE,
435 &adapter->msgRingPA);
436 if (!adapter->msg_ring)
437 return -ENOMEM;
438 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
439
440 return 0;
441}
442
443static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
444{
445 struct PVSCSICmdDescSetupRings cmd = { 0 };
446 dma_addr_t base;
447 unsigned i;
448
449 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT;
450 cmd.reqRingNumPages = adapter->req_pages;
451 cmd.cmpRingNumPages = adapter->cmp_pages;
452
453 base = adapter->reqRingPA;
454 for (i = 0; i < adapter->req_pages; i++) {
455 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
456 base += PAGE_SIZE;
457 }
458
459 base = adapter->cmpRingPA;
460 for (i = 0; i < adapter->cmp_pages; i++) {
461 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
462 base += PAGE_SIZE;
463 }
464
465 memset(adapter->rings_state, 0, PAGE_SIZE);
466 memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE);
467 memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE);
468
469 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
470 &cmd, sizeof(cmd));
471
472 if (adapter->use_msg) {
473 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
474
475 cmd_msg.numPages = adapter->msg_pages;
476
477 base = adapter->msgRingPA;
478 for (i = 0; i < adapter->msg_pages; i++) {
479 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
480 base += PAGE_SIZE;
481 }
482 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
483
484 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
485 &cmd_msg, sizeof(cmd_msg));
486 }
487}
488
489/*
490 * Pull a completion descriptor off and pass the completion back
491 * to the SCSI mid layer.
492 */
493static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
494 const struct PVSCSIRingCmpDesc *e)
495{
496 struct pvscsi_ctx *ctx;
497 struct scsi_cmnd *cmd;
498 u32 btstat = e->hostStatus;
499 u32 sdstat = e->scsiStatus;
500
501 ctx = pvscsi_get_context(adapter, e->context);
502 cmd = ctx->cmd;
503 pvscsi_unmap_buffers(adapter, ctx);
504 pvscsi_release_context(adapter, ctx);
505 cmd->result = 0;
506
507 if (sdstat != SAM_STAT_GOOD &&
508 (btstat == BTSTAT_SUCCESS ||
509 btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
510 btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
511 cmd->result = (DID_OK << 16) | sdstat;
512 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
513 cmd->result |= (DRIVER_SENSE << 24);
514 } else
515 switch (btstat) {
516 case BTSTAT_SUCCESS:
517 case BTSTAT_LINKED_COMMAND_COMPLETED:
518 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
519 /* If everything went fine, let's move on.. */
520 cmd->result = (DID_OK << 16);
521 break;
522
523 case BTSTAT_DATARUN:
524 case BTSTAT_DATA_UNDERRUN:
525 /* Report residual data in underruns */
526 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
527 cmd->result = (DID_ERROR << 16);
528 break;
529
530 case BTSTAT_SELTIMEO:
531 /* Our emulation returns this for non-connected devs */
532 cmd->result = (DID_BAD_TARGET << 16);
533 break;
534
535 case BTSTAT_LUNMISMATCH:
536 case BTSTAT_TAGREJECT:
537 case BTSTAT_BADMSG:
538 cmd->result = (DRIVER_INVALID << 24);
539 /* fall through */
540
541 case BTSTAT_HAHARDWARE:
542 case BTSTAT_INVPHASE:
543 case BTSTAT_HATIMEOUT:
544 case BTSTAT_NORESPONSE:
545 case BTSTAT_DISCONNECT:
546 case BTSTAT_HASOFTWARE:
547 case BTSTAT_BUSFREE:
548 case BTSTAT_SENSFAILED:
549 cmd->result |= (DID_ERROR << 16);
550 break;
551
552 case BTSTAT_SENTRST:
553 case BTSTAT_RECVRST:
554 case BTSTAT_BUSRESET:
555 cmd->result = (DID_RESET << 16);
556 break;
557
558 case BTSTAT_ABORTQUEUE:
559 cmd->result = (DID_ABORT << 16);
560 break;
561
562 case BTSTAT_SCSIPARITY:
563 cmd->result = (DID_PARITY << 16);
564 break;
565
566 default:
567 cmd->result = (DID_ERROR << 16);
568 scmd_printk(KERN_DEBUG, cmd,
569 "Unknown completion status: 0x%x\n",
570 btstat);
571 }
572
573 dev_dbg(&cmd->device->sdev_gendev,
574 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
575 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
576
577 cmd->scsi_done(cmd);
578}
579
580/*
581 * barrier usage : Since the PVSCSI device is emulated, there could be cases
582 * where we may want to serialize some accesses between the driver and the
583 * emulation layer. We use compiler barriers instead of the more expensive
584 * memory barriers because PVSCSI is only supported on X86 which has strong
585 * memory access ordering.
586 */
587static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
588{
589 struct PVSCSIRingsState *s = adapter->rings_state;
590 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
591 u32 cmp_entries = s->cmpNumEntriesLog2;
592
593 while (s->cmpConsIdx != s->cmpProdIdx) {
594 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
595 MASK(cmp_entries));
596 /*
597 * This barrier() ensures that *e is not dereferenced while
598 * the device emulation still writes data into the slot.
599 * Since the device emulation advances s->cmpProdIdx only after
600 * updating the slot we want to check it first.
601 */
602 barrier();
603 pvscsi_complete_request(adapter, e);
604 /*
605 * This barrier() ensures that compiler doesn't reorder write
606 * to s->cmpConsIdx before the read of (*e) inside
607 * pvscsi_complete_request. Otherwise, device emulation may
608 * overwrite *e before we had a chance to read it.
609 */
610 barrier();
611 s->cmpConsIdx++;
612 }
613}
614
615/*
616 * Translate a Linux SCSI request into a request ring entry.
617 */
618static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
619 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
620{
621 struct PVSCSIRingsState *s;
622 struct PVSCSIRingReqDesc *e;
623 struct scsi_device *sdev;
624 u32 req_entries;
625
626 s = adapter->rings_state;
627 sdev = cmd->device;
628 req_entries = s->reqNumEntriesLog2;
629
630 /*
631 * If this condition holds, we might have room on the request ring, but
632 * we might not have room on the completion ring for the response.
633 * However, we have already ruled out this possibility - we would not
634 * have successfully allocated a context if it were true, since we only
635 * have one context per request entry. Check for it anyway, since it
636 * would be a serious bug.
637 */
638 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
639 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
640 "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
641 s->reqProdIdx, s->cmpConsIdx);
642 return -1;
643 }
644
645 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
646
647 e->bus = sdev->channel;
648 e->target = sdev->id;
649 memset(e->lun, 0, sizeof(e->lun));
650 e->lun[1] = sdev->lun;
651
652 if (cmd->sense_buffer) {
653 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
654 SCSI_SENSE_BUFFERSIZE,
655 PCI_DMA_FROMDEVICE);
656 e->senseAddr = ctx->sensePA;
657 e->senseLen = SCSI_SENSE_BUFFERSIZE;
658 } else {
659 e->senseLen = 0;
660 e->senseAddr = 0;
661 }
662 e->cdbLen = cmd->cmd_len;
663 e->vcpuHint = smp_processor_id();
664 memcpy(e->cdb, cmd->cmnd, e->cdbLen);
665
666 e->tag = SIMPLE_QUEUE_TAG;
667 if (sdev->tagged_supported &&
668 (cmd->tag == HEAD_OF_QUEUE_TAG ||
669 cmd->tag == ORDERED_QUEUE_TAG))
670 e->tag = cmd->tag;
671
672 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
673 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
674 else if (cmd->sc_data_direction == DMA_TO_DEVICE)
675 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
676 else if (cmd->sc_data_direction == DMA_NONE)
677 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
678 else
679 e->flags = 0;
680
681 pvscsi_map_buffers(adapter, ctx, cmd, e);
682
683 e->context = pvscsi_map_context(adapter, ctx);
684
685 barrier();
686
687 s->reqProdIdx++;
688
689 return 0;
690}
691
692static int pvscsi_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
693{
694 struct Scsi_Host *host = cmd->device->host;
695 struct pvscsi_adapter *adapter = shost_priv(host);
696 struct pvscsi_ctx *ctx;
697 unsigned long flags;
698
699 spin_lock_irqsave(&adapter->hw_lock, flags);
700
701 ctx = pvscsi_acquire_context(adapter, cmd);
702 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
703 if (ctx)
704 pvscsi_release_context(adapter, ctx);
705 spin_unlock_irqrestore(&adapter->hw_lock, flags);
706 return SCSI_MLQUEUE_HOST_BUSY;
707 }
708
709 cmd->scsi_done = done;
710
711 dev_dbg(&cmd->device->sdev_gendev,
712 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
713
714 spin_unlock_irqrestore(&adapter->hw_lock, flags);
715
716 pvscsi_kick_io(adapter, cmd->cmnd[0]);
717
718 return 0;
719}
720
721static int pvscsi_abort(struct scsi_cmnd *cmd)
722{
723 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
724 struct pvscsi_ctx *ctx;
725 unsigned long flags;
726
727 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
728 adapter->host->host_no, cmd);
729
730 spin_lock_irqsave(&adapter->hw_lock, flags);
731
732 /*
733 * Poll the completion ring first - we might be trying to abort
734 * a command that is waiting to be dispatched in the completion ring.
735 */
736 pvscsi_process_completion_ring(adapter);
737
738 /*
739 * If there is no context for the command, it either already succeeded
740 * or else was never properly issued. Not our problem.
741 */
742 ctx = pvscsi_find_context(adapter, cmd);
743 if (!ctx) {
744 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
745 goto out;
746 }
747
748 pvscsi_abort_cmd(adapter, ctx);
749
750 pvscsi_process_completion_ring(adapter);
751
752out:
753 spin_unlock_irqrestore(&adapter->hw_lock, flags);
754 return SUCCESS;
755}
756
757/*
758 * Abort all outstanding requests. This is only safe to use if the completion
759 * ring will never be walked again or the device has been reset, because it
760 * destroys the 1-1 mapping between context field passed to emulation and our
761 * request structure.
762 */
763static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
764{
765 unsigned i;
766
767 for (i = 0; i < adapter->req_depth; i++) {
768 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
769 struct scsi_cmnd *cmd = ctx->cmd;
770 if (cmd) {
771 scmd_printk(KERN_ERR, cmd,
772 "Forced reset on cmd %p\n", cmd);
773 pvscsi_unmap_buffers(adapter, ctx);
774 pvscsi_release_context(adapter, ctx);
775 cmd->result = (DID_RESET << 16);
776 cmd->scsi_done(cmd);
777 }
778 }
779}
780
781static int pvscsi_host_reset(struct scsi_cmnd *cmd)
782{
783 struct Scsi_Host *host = cmd->device->host;
784 struct pvscsi_adapter *adapter = shost_priv(host);
785 unsigned long flags;
786 bool use_msg;
787
788 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
789
790 spin_lock_irqsave(&adapter->hw_lock, flags);
791
792 use_msg = adapter->use_msg;
793
794 if (use_msg) {
795 adapter->use_msg = 0;
796 spin_unlock_irqrestore(&adapter->hw_lock, flags);
797
798 /*
799 * Now that we know that the ISR won't add more work on the
800 * workqueue we can safely flush any outstanding work.
801 */
802 flush_workqueue(adapter->workqueue);
803 spin_lock_irqsave(&adapter->hw_lock, flags);
804 }
805
806 /*
807 * We're going to tear down the entire ring structure and set it back
808 * up, so stalling new requests until all completions are flushed and
809 * the rings are back in place.
810 */
811
812 pvscsi_process_request_ring(adapter);
813
814 ll_adapter_reset(adapter);
815
816 /*
817 * Now process any completions. Note we do this AFTER adapter reset,
818 * which is strange, but stops races where completions get posted
819 * between processing the ring and issuing the reset. The backend will
820 * not touch the ring memory after reset, so the immediately pre-reset
821 * completion ring state is still valid.
822 */
823 pvscsi_process_completion_ring(adapter);
824
825 pvscsi_reset_all(adapter);
826 adapter->use_msg = use_msg;
827 pvscsi_setup_all_rings(adapter);
828 pvscsi_unmask_intr(adapter);
829
830 spin_unlock_irqrestore(&adapter->hw_lock, flags);
831
832 return SUCCESS;
833}
834
835static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
836{
837 struct Scsi_Host *host = cmd->device->host;
838 struct pvscsi_adapter *adapter = shost_priv(host);
839 unsigned long flags;
840
841 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
842
843 /*
844 * We don't want to queue new requests for this bus after
845 * flushing all pending requests to emulation, since new
846 * requests could then sneak in during this bus reset phase,
847 * so take the lock now.
848 */
849 spin_lock_irqsave(&adapter->hw_lock, flags);
850
851 pvscsi_process_request_ring(adapter);
852 ll_bus_reset(adapter);
853 pvscsi_process_completion_ring(adapter);
854
855 spin_unlock_irqrestore(&adapter->hw_lock, flags);
856
857 return SUCCESS;
858}
859
860static int pvscsi_device_reset(struct scsi_cmnd *cmd)
861{
862 struct Scsi_Host *host = cmd->device->host;
863 struct pvscsi_adapter *adapter = shost_priv(host);
864 unsigned long flags;
865
866 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
867 host->host_no, cmd->device->id);
868
869 /*
870 * We don't want to queue new requests for this device after flushing
871 * all pending requests to emulation, since new requests could then
872 * sneak in during this device reset phase, so take the lock now.
873 */
874 spin_lock_irqsave(&adapter->hw_lock, flags);
875
876 pvscsi_process_request_ring(adapter);
877 ll_device_reset(adapter, cmd->device->id);
878 pvscsi_process_completion_ring(adapter);
879
880 spin_unlock_irqrestore(&adapter->hw_lock, flags);
881
882 return SUCCESS;
883}
884
885static struct scsi_host_template pvscsi_template;
886
887static const char *pvscsi_info(struct Scsi_Host *host)
888{
889 struct pvscsi_adapter *adapter = shost_priv(host);
890 static char buf[256];
891
892 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
893 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
894 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
895 pvscsi_template.cmd_per_lun);
896
897 return buf;
898}
899
900static struct scsi_host_template pvscsi_template = {
901 .module = THIS_MODULE,
902 .name = "VMware PVSCSI Host Adapter",
903 .proc_name = "vmw_pvscsi",
904 .info = pvscsi_info,
905 .queuecommand = pvscsi_queue,
906 .this_id = -1,
907 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
908 .dma_boundary = UINT_MAX,
909 .max_sectors = 0xffff,
910 .use_clustering = ENABLE_CLUSTERING,
911 .eh_abort_handler = pvscsi_abort,
912 .eh_device_reset_handler = pvscsi_device_reset,
913 .eh_bus_reset_handler = pvscsi_bus_reset,
914 .eh_host_reset_handler = pvscsi_host_reset,
915};
916
917static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
918 const struct PVSCSIRingMsgDesc *e)
919{
920 struct PVSCSIRingsState *s = adapter->rings_state;
921 struct Scsi_Host *host = adapter->host;
922 struct scsi_device *sdev;
923
924 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
925 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
926
927 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
928
929 if (e->type == PVSCSI_MSG_DEV_ADDED) {
930 struct PVSCSIMsgDescDevStatusChanged *desc;
931 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
932
933 printk(KERN_INFO
934 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
935 desc->bus, desc->target, desc->lun[1]);
936
937 if (!scsi_host_get(host))
938 return;
939
940 sdev = scsi_device_lookup(host, desc->bus, desc->target,
941 desc->lun[1]);
942 if (sdev) {
943 printk(KERN_INFO "vmw_pvscsi: device already exists\n");
944 scsi_device_put(sdev);
945 } else
946 scsi_add_device(adapter->host, desc->bus,
947 desc->target, desc->lun[1]);
948
949 scsi_host_put(host);
950 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
951 struct PVSCSIMsgDescDevStatusChanged *desc;
952 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
953
954 printk(KERN_INFO
955 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
956 desc->bus, desc->target, desc->lun[1]);
957
958 if (!scsi_host_get(host))
959 return;
960
961 sdev = scsi_device_lookup(host, desc->bus, desc->target,
962 desc->lun[1]);
963 if (sdev) {
964 scsi_remove_device(sdev);
965 scsi_device_put(sdev);
966 } else
967 printk(KERN_INFO
968 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
969 desc->bus, desc->target, desc->lun[1]);
970
971 scsi_host_put(host);
972 }
973}
974
975static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
976{
977 struct PVSCSIRingsState *s = adapter->rings_state;
978
979 return s->msgProdIdx != s->msgConsIdx;
980}
981
982static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
983{
984 struct PVSCSIRingsState *s = adapter->rings_state;
985 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
986 u32 msg_entries = s->msgNumEntriesLog2;
987
988 while (pvscsi_msg_pending(adapter)) {
989 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
990 MASK(msg_entries));
991
992 barrier();
993 pvscsi_process_msg(adapter, e);
994 barrier();
995 s->msgConsIdx++;
996 }
997}
998
999static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1000{
1001 struct pvscsi_adapter *adapter;
1002
1003 adapter = container_of(data, struct pvscsi_adapter, work);
1004
1005 pvscsi_process_msg_ring(adapter);
1006}
1007
1008static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1009{
1010 char name[32];
1011
1012 if (!pvscsi_use_msg)
1013 return 0;
1014
1015 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1016 PVSCSI_CMD_SETUP_MSG_RING);
1017
1018 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1019 return 0;
1020
1021 snprintf(name, sizeof(name),
1022 "vmw_pvscsi_wq_%u", adapter->host->host_no);
1023
1024 adapter->workqueue = create_singlethread_workqueue(name);
1025 if (!adapter->workqueue) {
1026 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1027 return 0;
1028 }
1029 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1030
1031 return 1;
1032}
1033
1034static irqreturn_t pvscsi_isr(int irq, void *devp)
1035{
1036 struct pvscsi_adapter *adapter = devp;
1037 int handled;
1038
1039 if (adapter->use_msi || adapter->use_msix)
1040 handled = true;
1041 else {
1042 u32 val = pvscsi_read_intr_status(adapter);
1043 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1044 if (handled)
1045 pvscsi_write_intr_status(devp, val);
1046 }
1047
1048 if (handled) {
1049 unsigned long flags;
1050
1051 spin_lock_irqsave(&adapter->hw_lock, flags);
1052
1053 pvscsi_process_completion_ring(adapter);
1054 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1055 queue_work(adapter->workqueue, &adapter->work);
1056
1057 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1058 }
1059
1060 return IRQ_RETVAL(handled);
1061}
1062
1063static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1064{
1065 struct pvscsi_ctx *ctx = adapter->cmd_map;
1066 unsigned i;
1067
1068 for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1069 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1070}
1071
1072static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, int *irq)
1073{
1074 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1075 int ret;
1076
1077 ret = pci_enable_msix(adapter->dev, &entry, 1);
1078 if (ret)
1079 return ret;
1080
1081 *irq = entry.vector;
1082
1083 return 0;
1084}
1085
1086static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1087{
1088 if (adapter->irq) {
1089 free_irq(adapter->irq, adapter);
1090 adapter->irq = 0;
1091 }
1092 if (adapter->use_msi) {
1093 pci_disable_msi(adapter->dev);
1094 adapter->use_msi = 0;
1095 } else if (adapter->use_msix) {
1096 pci_disable_msix(adapter->dev);
1097 adapter->use_msix = 0;
1098 }
1099}
1100
1101static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1102{
1103 pvscsi_shutdown_intr(adapter);
1104
1105 if (adapter->workqueue)
1106 destroy_workqueue(adapter->workqueue);
1107
1108 if (adapter->mmioBase)
1109 pci_iounmap(adapter->dev, adapter->mmioBase);
1110
1111 pci_release_regions(adapter->dev);
1112
1113 if (adapter->cmd_map) {
1114 pvscsi_free_sgls(adapter);
1115 kfree(adapter->cmd_map);
1116 }
1117
1118 if (adapter->rings_state)
1119 pci_free_consistent(adapter->dev, PAGE_SIZE,
1120 adapter->rings_state, adapter->ringStatePA);
1121
1122 if (adapter->req_ring)
1123 pci_free_consistent(adapter->dev,
1124 adapter->req_pages * PAGE_SIZE,
1125 adapter->req_ring, adapter->reqRingPA);
1126
1127 if (adapter->cmp_ring)
1128 pci_free_consistent(adapter->dev,
1129 adapter->cmp_pages * PAGE_SIZE,
1130 adapter->cmp_ring, adapter->cmpRingPA);
1131
1132 if (adapter->msg_ring)
1133 pci_free_consistent(adapter->dev,
1134 adapter->msg_pages * PAGE_SIZE,
1135 adapter->msg_ring, adapter->msgRingPA);
1136}
1137
1138/*
1139 * Allocate scatter gather lists.
1140 *
1141 * These are statically allocated. Trying to be clever was not worth it.
1142 *
1143 * Dynamic allocation can fail, and we can't go deeep into the memory
1144 * allocator, since we're a SCSI driver, and trying too hard to allocate
1145 * memory might generate disk I/O. We also don't want to fail disk I/O
1146 * in that case because we can't get an allocation - the I/O could be
1147 * trying to swap out data to free memory. Since that is pathological,
1148 * just use a statically allocated scatter list.
1149 *
1150 */
1151static int __devinit pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1152{
1153 struct pvscsi_ctx *ctx;
1154 int i;
1155
1156 ctx = adapter->cmd_map;
1157 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1158
1159 for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1160 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1161 get_order(SGL_SIZE));
1162 ctx->sglPA = 0;
1163 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1164 if (!ctx->sgl) {
1165 for (; i >= 0; --i, --ctx) {
1166 free_pages((unsigned long)ctx->sgl,
1167 get_order(SGL_SIZE));
1168 ctx->sgl = NULL;
1169 }
1170 return -ENOMEM;
1171 }
1172 }
1173
1174 return 0;
1175}
1176
1177static int __devinit pvscsi_probe(struct pci_dev *pdev,
1178 const struct pci_device_id *id)
1179{
1180 struct pvscsi_adapter *adapter;
1181 struct Scsi_Host *host;
1182 unsigned int i;
1183 unsigned long flags = 0;
1184 int error;
1185
1186 error = -ENODEV;
1187
1188 if (pci_enable_device(pdev))
1189 return error;
1190
1191 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1192 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1193 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1194 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1195 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1196 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1197 } else {
1198 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1199 goto out_disable_device;
1200 }
1201
1202 pvscsi_template.can_queue =
1203 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1204 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1205 pvscsi_template.cmd_per_lun =
1206 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1207 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1208 if (!host) {
1209 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1210 goto out_disable_device;
1211 }
1212
1213 adapter = shost_priv(host);
1214 memset(adapter, 0, sizeof(*adapter));
1215 adapter->dev = pdev;
1216 adapter->host = host;
1217
1218 spin_lock_init(&adapter->hw_lock);
1219
1220 host->max_channel = 0;
1221 host->max_id = 16;
1222 host->max_lun = 1;
1223 host->max_cmd_len = 16;
1224
1225 adapter->rev = pdev->revision;
1226
1227 if (pci_request_regions(pdev, "vmw_pvscsi")) {
1228 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1229 goto out_free_host;
1230 }
1231
1232 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1233 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1234 continue;
1235
1236 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1237 continue;
1238
1239 break;
1240 }
1241
1242 if (i == DEVICE_COUNT_RESOURCE) {
1243 printk(KERN_ERR
1244 "vmw_pvscsi: adapter has no suitable MMIO region\n");
1245 goto out_release_resources;
1246 }
1247
1248 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1249
1250 if (!adapter->mmioBase) {
1251 printk(KERN_ERR
1252 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1253 i, PVSCSI_MEM_SPACE_SIZE);
1254 goto out_release_resources;
1255 }
1256
1257 pci_set_master(pdev);
1258 pci_set_drvdata(pdev, host);
1259
1260 ll_adapter_reset(adapter);
1261
1262 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1263
1264 error = pvscsi_allocate_rings(adapter);
1265 if (error) {
1266 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1267 goto out_release_resources;
1268 }
1269
1270 /*
1271 * From this point on we should reset the adapter if anything goes
1272 * wrong.
1273 */
1274 pvscsi_setup_all_rings(adapter);
1275
1276 adapter->cmd_map = kcalloc(adapter->req_depth,
1277 sizeof(struct pvscsi_ctx), GFP_KERNEL);
1278 if (!adapter->cmd_map) {
1279 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1280 error = -ENOMEM;
1281 goto out_reset_adapter;
1282 }
1283
1284 INIT_LIST_HEAD(&adapter->cmd_pool);
1285 for (i = 0; i < adapter->req_depth; i++) {
1286 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1287 list_add(&ctx->list, &adapter->cmd_pool);
1288 }
1289
1290 error = pvscsi_allocate_sg(adapter);
1291 if (error) {
1292 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1293 goto out_reset_adapter;
1294 }
1295
1296 if (!pvscsi_disable_msix &&
1297 pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1298 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1299 adapter->use_msix = 1;
1300 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1301 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1302 adapter->use_msi = 1;
1303 adapter->irq = pdev->irq;
1304 } else {
1305 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1306 adapter->irq = pdev->irq;
1307 flags = IRQF_SHARED;
1308 }
1309
1310 error = request_irq(adapter->irq, pvscsi_isr, flags,
1311 "vmw_pvscsi", adapter);
1312 if (error) {
1313 printk(KERN_ERR
1314 "vmw_pvscsi: unable to request IRQ: %d\n", error);
1315 adapter->irq = 0;
1316 goto out_reset_adapter;
1317 }
1318
1319 error = scsi_add_host(host, &pdev->dev);
1320 if (error) {
1321 printk(KERN_ERR
1322 "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1323 goto out_reset_adapter;
1324 }
1325
1326 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1327 adapter->rev, host->host_no);
1328
1329 pvscsi_unmask_intr(adapter);
1330
1331 scsi_scan_host(host);
1332
1333 return 0;
1334
1335out_reset_adapter:
1336 ll_adapter_reset(adapter);
1337out_release_resources:
1338 pvscsi_release_resources(adapter);
1339out_free_host:
1340 scsi_host_put(host);
1341out_disable_device:
1342 pci_set_drvdata(pdev, NULL);
1343 pci_disable_device(pdev);
1344
1345 return error;
1346}
1347
1348static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1349{
1350 pvscsi_mask_intr(adapter);
1351
1352 if (adapter->workqueue)
1353 flush_workqueue(adapter->workqueue);
1354
1355 pvscsi_shutdown_intr(adapter);
1356
1357 pvscsi_process_request_ring(adapter);
1358 pvscsi_process_completion_ring(adapter);
1359 ll_adapter_reset(adapter);
1360}
1361
1362static void pvscsi_shutdown(struct pci_dev *dev)
1363{
1364 struct Scsi_Host *host = pci_get_drvdata(dev);
1365 struct pvscsi_adapter *adapter = shost_priv(host);
1366
1367 __pvscsi_shutdown(adapter);
1368}
1369
1370static void pvscsi_remove(struct pci_dev *pdev)
1371{
1372 struct Scsi_Host *host = pci_get_drvdata(pdev);
1373 struct pvscsi_adapter *adapter = shost_priv(host);
1374
1375 scsi_remove_host(host);
1376
1377 __pvscsi_shutdown(adapter);
1378 pvscsi_release_resources(adapter);
1379
1380 scsi_host_put(host);
1381
1382 pci_set_drvdata(pdev, NULL);
1383 pci_disable_device(pdev);
1384}
1385
1386static struct pci_driver pvscsi_pci_driver = {
1387 .name = "vmw_pvscsi",
1388 .id_table = pvscsi_pci_tbl,
1389 .probe = pvscsi_probe,
1390 .remove = __devexit_p(pvscsi_remove),
1391 .shutdown = pvscsi_shutdown,
1392};
1393
1394static int __init pvscsi_init(void)
1395{
1396 pr_info("%s - version %s\n",
1397 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1398 return pci_register_driver(&pvscsi_pci_driver);
1399}
1400
1401static void __exit pvscsi_exit(void)
1402{
1403 pci_unregister_driver(&pvscsi_pci_driver);
1404}
1405
1406module_init(pvscsi_init);
1407module_exit(pvscsi_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 04:23:53 -0500