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fix section mismatch warnings
[GitHub/mt8127/android_kernel_alcatel_ttab.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 *
a9310735 20 * Maintained by: Arvind Kumar <arvindkumar@vmware.com>
851b1642
AK		 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{
59e13d48 298 dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter);
851b1642
AK		 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
59e13d48 307 dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target);
851b1642
AK		 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
6f039790 400static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
851b1642
AK		 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
f281233d 693static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
851b1642
AK		 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
f281233d
JG		 722static DEF_SCSI_QCMD(pvscsi_queue)
723
851b1642
AK		 724static int pvscsi_abort(struct scsi_cmnd *cmd)
725{
726 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
727 struct pvscsi_ctx *ctx;
728 unsigned long flags;
729
730 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
731 adapter->host->host_no, cmd);
732
733 spin_lock_irqsave(&adapter->hw_lock, flags);
734
735 /*
736 * Poll the completion ring first - we might be trying to abort
737 * a command that is waiting to be dispatched in the completion ring.
738 */
739 pvscsi_process_completion_ring(adapter);
740
741 /*
742 * If there is no context for the command, it either already succeeded
743 * or else was never properly issued. Not our problem.
744 */
745 ctx = pvscsi_find_context(adapter, cmd);
746 if (!ctx) {
747 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
748 goto out;
749 }
750
751 pvscsi_abort_cmd(adapter, ctx);
752
753 pvscsi_process_completion_ring(adapter);
754
755out:
756 spin_unlock_irqrestore(&adapter->hw_lock, flags);
757 return SUCCESS;
758}
759
760/*
761 * Abort all outstanding requests. This is only safe to use if the completion
762 * ring will never be walked again or the device has been reset, because it
763 * destroys the 1-1 mapping between context field passed to emulation and our
764 * request structure.
765 */
766static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
767{
768 unsigned i;
769
770 for (i = 0; i < adapter->req_depth; i++) {
771 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
772 struct scsi_cmnd *cmd = ctx->cmd;
773 if (cmd) {
774 scmd_printk(KERN_ERR, cmd,
775 "Forced reset on cmd %p\n", cmd);
776 pvscsi_unmap_buffers(adapter, ctx);
777 pvscsi_release_context(adapter, ctx);
778 cmd->result = (DID_RESET << 16);
779 cmd->scsi_done(cmd);
780 }
781 }
782}
783
784static int pvscsi_host_reset(struct scsi_cmnd *cmd)
785{
786 struct Scsi_Host *host = cmd->device->host;
787 struct pvscsi_adapter *adapter = shost_priv(host);
788 unsigned long flags;
789 bool use_msg;
790
791 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
792
793 spin_lock_irqsave(&adapter->hw_lock, flags);
794
795 use_msg = adapter->use_msg;
796
797 if (use_msg) {
798 adapter->use_msg = 0;
799 spin_unlock_irqrestore(&adapter->hw_lock, flags);
800
801 /*
802 * Now that we know that the ISR won't add more work on the
803 * workqueue we can safely flush any outstanding work.
804 */
805 flush_workqueue(adapter->workqueue);
806 spin_lock_irqsave(&adapter->hw_lock, flags);
807 }
808
809 /*
810 * We're going to tear down the entire ring structure and set it back
811 * up, so stalling new requests until all completions are flushed and
812 * the rings are back in place.
813 */
814
815 pvscsi_process_request_ring(adapter);
816
817 ll_adapter_reset(adapter);
818
819 /*
820 * Now process any completions. Note we do this AFTER adapter reset,
821 * which is strange, but stops races where completions get posted
822 * between processing the ring and issuing the reset. The backend will
823 * not touch the ring memory after reset, so the immediately pre-reset
824 * completion ring state is still valid.
825 */
826 pvscsi_process_completion_ring(adapter);
827
828 pvscsi_reset_all(adapter);
829 adapter->use_msg = use_msg;
830 pvscsi_setup_all_rings(adapter);
831 pvscsi_unmask_intr(adapter);
832
833 spin_unlock_irqrestore(&adapter->hw_lock, flags);
834
835 return SUCCESS;
836}
837
838static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
839{
840 struct Scsi_Host *host = cmd->device->host;
841 struct pvscsi_adapter *adapter = shost_priv(host);
842 unsigned long flags;
843
844 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
845
846 /*
847 * We don't want to queue new requests for this bus after
848 * flushing all pending requests to emulation, since new
849 * requests could then sneak in during this bus reset phase,
850 * so take the lock now.
851 */
852 spin_lock_irqsave(&adapter->hw_lock, flags);
853
854 pvscsi_process_request_ring(adapter);
855 ll_bus_reset(adapter);
856 pvscsi_process_completion_ring(adapter);
857
858 spin_unlock_irqrestore(&adapter->hw_lock, flags);
859
860 return SUCCESS;
861}
862
863static int pvscsi_device_reset(struct scsi_cmnd *cmd)
864{
865 struct Scsi_Host *host = cmd->device->host;
866 struct pvscsi_adapter *adapter = shost_priv(host);
867 unsigned long flags;
868
869 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
870 host->host_no, cmd->device->id);
871
872 /*
873 * We don't want to queue new requests for this device after flushing
874 * all pending requests to emulation, since new requests could then
875 * sneak in during this device reset phase, so take the lock now.
876 */
877 spin_lock_irqsave(&adapter->hw_lock, flags);
878
879 pvscsi_process_request_ring(adapter);
880 ll_device_reset(adapter, cmd->device->id);
881 pvscsi_process_completion_ring(adapter);
882
883 spin_unlock_irqrestore(&adapter->hw_lock, flags);
884
885 return SUCCESS;
886}
887
888static struct scsi_host_template pvscsi_template;
889
890static const char *pvscsi_info(struct Scsi_Host *host)
891{
892 struct pvscsi_adapter *adapter = shost_priv(host);
893 static char buf[256];
894
895 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
896 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
897 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
898 pvscsi_template.cmd_per_lun);
899
900 return buf;
901}
902
903static struct scsi_host_template pvscsi_template = {
904 .module = THIS_MODULE,
905 .name = "VMware PVSCSI Host Adapter",
906 .proc_name = "vmw_pvscsi",
907 .info = pvscsi_info,
908 .queuecommand = pvscsi_queue,
909 .this_id = -1,
910 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
911 .dma_boundary = UINT_MAX,
912 .max_sectors = 0xffff,
913 .use_clustering = ENABLE_CLUSTERING,
914 .eh_abort_handler = pvscsi_abort,
915 .eh_device_reset_handler = pvscsi_device_reset,
916 .eh_bus_reset_handler = pvscsi_bus_reset,
917 .eh_host_reset_handler = pvscsi_host_reset,
918};
919
920static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
921 const struct PVSCSIRingMsgDesc *e)
922{
923 struct PVSCSIRingsState *s = adapter->rings_state;
924 struct Scsi_Host *host = adapter->host;
925 struct scsi_device *sdev;
926
927 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
928 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
929
930 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
931
932 if (e->type == PVSCSI_MSG_DEV_ADDED) {
933 struct PVSCSIMsgDescDevStatusChanged *desc;
934 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
935
936 printk(KERN_INFO
937 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
938 desc->bus, desc->target, desc->lun[1]);
939
940 if (!scsi_host_get(host))
941 return;
942
943 sdev = scsi_device_lookup(host, desc->bus, desc->target,
944 desc->lun[1]);
945 if (sdev) {
946 printk(KERN_INFO "vmw_pvscsi: device already exists\n");
947 scsi_device_put(sdev);
948 } else
949 scsi_add_device(adapter->host, desc->bus,
950 desc->target, desc->lun[1]);
951
952 scsi_host_put(host);
953 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
954 struct PVSCSIMsgDescDevStatusChanged *desc;
955 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
956
957 printk(KERN_INFO
958 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
959 desc->bus, desc->target, desc->lun[1]);
960
961 if (!scsi_host_get(host))
962 return;
963
964 sdev = scsi_device_lookup(host, desc->bus, desc->target,
965 desc->lun[1]);
966 if (sdev) {
967 scsi_remove_device(sdev);
968 scsi_device_put(sdev);
969 } else
970 printk(KERN_INFO
971 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
972 desc->bus, desc->target, desc->lun[1]);
973
974 scsi_host_put(host);
975 }
976}
977
978static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
979{
980 struct PVSCSIRingsState *s = adapter->rings_state;
981
982 return s->msgProdIdx != s->msgConsIdx;
983}
984
985static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
986{
987 struct PVSCSIRingsState *s = adapter->rings_state;
988 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
989 u32 msg_entries = s->msgNumEntriesLog2;
990
991 while (pvscsi_msg_pending(adapter)) {
992 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
993 MASK(msg_entries));
994
995 barrier();
996 pvscsi_process_msg(adapter, e);
997 barrier();
998 s->msgConsIdx++;
999 }
1000}
1001
1002static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1003{
1004 struct pvscsi_adapter *adapter;
1005
1006 adapter = container_of(data, struct pvscsi_adapter, work);
1007
1008 pvscsi_process_msg_ring(adapter);
1009}
1010
1011static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1012{
1013 char name[32];
1014
1015 if (!pvscsi_use_msg)
1016 return 0;
1017
1018 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1019 PVSCSI_CMD_SETUP_MSG_RING);
1020
1021 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1022 return 0;
1023
1024 snprintf(name, sizeof(name),
1025 "vmw_pvscsi_wq_%u", adapter->host->host_no);
1026
1027 adapter->workqueue = create_singlethread_workqueue(name);
1028 if (!adapter->workqueue) {
1029 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1030 return 0;
1031 }
1032 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1033
1034 return 1;
1035}
1036
1037static irqreturn_t pvscsi_isr(int irq, void *devp)
1038{
1039 struct pvscsi_adapter *adapter = devp;
1040 int handled;
1041
1042 if (adapter->use_msi || adapter->use_msix)
1043 handled = true;
1044 else {
1045 u32 val = pvscsi_read_intr_status(adapter);
1046 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1047 if (handled)
1048 pvscsi_write_intr_status(devp, val);
1049 }
1050
1051 if (handled) {
1052 unsigned long flags;
1053
1054 spin_lock_irqsave(&adapter->hw_lock, flags);
1055
1056 pvscsi_process_completion_ring(adapter);
1057 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1058 queue_work(adapter->workqueue, &adapter->work);
1059
1060 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1061 }
1062
1063 return IRQ_RETVAL(handled);
1064}
1065
1066static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1067{
1068 struct pvscsi_ctx *ctx = adapter->cmd_map;
1069 unsigned i;
1070
1071 for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1072 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1073}
1074
d0e2ddff
DT		 1075static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1076 unsigned int *irq)
851b1642
AK		 1077{
1078 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1079 int ret;
1080
1081 ret = pci_enable_msix(adapter->dev, &entry, 1);
1082 if (ret)
1083 return ret;
1084
1085 *irq = entry.vector;
1086
1087 return 0;
1088}
1089
1090static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1091{
1092 if (adapter->irq) {
1093 free_irq(adapter->irq, adapter);
1094 adapter->irq = 0;
1095 }
1096 if (adapter->use_msi) {
1097 pci_disable_msi(adapter->dev);
1098 adapter->use_msi = 0;
1099 } else if (adapter->use_msix) {
1100 pci_disable_msix(adapter->dev);
1101 adapter->use_msix = 0;
1102 }
1103}
1104
1105static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1106{
1107 pvscsi_shutdown_intr(adapter);
1108
1109 if (adapter->workqueue)
1110 destroy_workqueue(adapter->workqueue);
1111
1112 if (adapter->mmioBase)
1113 pci_iounmap(adapter->dev, adapter->mmioBase);
1114
1115 pci_release_regions(adapter->dev);
1116
1117 if (adapter->cmd_map) {
1118 pvscsi_free_sgls(adapter);
1119 kfree(adapter->cmd_map);
1120 }
1121
1122 if (adapter->rings_state)
1123 pci_free_consistent(adapter->dev, PAGE_SIZE,
1124 adapter->rings_state, adapter->ringStatePA);
1125
1126 if (adapter->req_ring)
1127 pci_free_consistent(adapter->dev,
1128 adapter->req_pages * PAGE_SIZE,
1129 adapter->req_ring, adapter->reqRingPA);
1130
1131 if (adapter->cmp_ring)
1132 pci_free_consistent(adapter->dev,
1133 adapter->cmp_pages * PAGE_SIZE,
1134 adapter->cmp_ring, adapter->cmpRingPA);
1135
1136 if (adapter->msg_ring)
1137 pci_free_consistent(adapter->dev,
1138 adapter->msg_pages * PAGE_SIZE,
1139 adapter->msg_ring, adapter->msgRingPA);
1140}
1141
1142/*
1143 * Allocate scatter gather lists.
1144 *
1145 * These are statically allocated. Trying to be clever was not worth it.
1146 *
42b2aa86 1147 * Dynamic allocation can fail, and we can't go deep into the memory
851b1642
AK		 1148 * allocator, since we're a SCSI driver, and trying too hard to allocate
1149 * memory might generate disk I/O. We also don't want to fail disk I/O
1150 * in that case because we can't get an allocation - the I/O could be
1151 * trying to swap out data to free memory. Since that is pathological,
1152 * just use a statically allocated scatter list.
1153 *
1154 */
6f039790 1155static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
851b1642
AK		 1156{
1157 struct pvscsi_ctx *ctx;
1158 int i;
1159
1160 ctx = adapter->cmd_map;
1161 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1162
1163 for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1164 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1165 get_order(SGL_SIZE));
1166 ctx->sglPA = 0;
1167 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1168 if (!ctx->sgl) {
1169 for (; i >= 0; --i, --ctx) {
1170 free_pages((unsigned long)ctx->sgl,
1171 get_order(SGL_SIZE));
1172 ctx->sgl = NULL;
1173 }
1174 return -ENOMEM;
1175 }
1176 }
1177
1178 return 0;
1179}
1180
a9310735
AK		 1181/*
1182 * Query the device, fetch the config info and return the
1183 * maximum number of targets on the adapter. In case of
1184 * failure due to any reason return default i.e. 16.
1185 */
1186static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)
1187{
1188 struct PVSCSICmdDescConfigCmd cmd;
1189 struct PVSCSIConfigPageHeader *header;
1190 struct device *dev;
1191 dma_addr_t configPagePA;
1192 void *config_page;
1193 u32 numPhys = 16;
1194
1195 dev = pvscsi_dev(adapter);
1196 config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
1197 &configPagePA);
1198 if (!config_page) {
1199 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n");
1200 goto exit;
1201 }
1202 BUG_ON(configPagePA & ~PAGE_MASK);
1203
1204 /* Fetch config info from the device. */
1205 cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32;
1206 cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;
1207 cmd.cmpAddr = configPagePA;
1208 cmd._pad = 0;
1209
1210 /*
1211 * Mark the completion page header with error values. If the device
1212 * completes the command successfully, it sets the status values to
1213 * indicate success.
1214 */
1215 header = config_page;
1216 memset(header, 0, sizeof *header);
1217 header->hostStatus = BTSTAT_INVPARAM;
1218 header->scsiStatus = SDSTAT_CHECK;
1219
1220 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd);
1221
1222 if (header->hostStatus == BTSTAT_SUCCESS &&
1223 header->scsiStatus == SDSTAT_GOOD) {
1224 struct PVSCSIConfigPageController *config;
1225
1226 config = config_page;
1227 numPhys = config->numPhys;
1228 } else
1229 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n",
1230 header->hostStatus, header->scsiStatus);
1231 pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA);
1232exit:
1233 return numPhys;
1234}
1235
6f039790 1236static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
851b1642
AK		 1237{
1238 struct pvscsi_adapter *adapter;
1239 struct Scsi_Host *host;
a9310735 1240 struct device *dev;
851b1642
AK		 1241 unsigned int i;
1242 unsigned long flags = 0;
1243 int error;
1244
1245 error = -ENODEV;
1246
1247 if (pci_enable_device(pdev))
1248 return error;
1249
1250 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1251 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1252 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1253 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1254 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1255 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1256 } else {
1257 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1258 goto out_disable_device;
1259 }
1260
1261 pvscsi_template.can_queue =
1262 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1263 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1264 pvscsi_template.cmd_per_lun =
1265 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1266 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1267 if (!host) {
1268 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1269 goto out_disable_device;
1270 }
1271
1272 adapter = shost_priv(host);
1273 memset(adapter, 0, sizeof(*adapter));
1274 adapter->dev = pdev;
1275 adapter->host = host;
1276
1277 spin_lock_init(&adapter->hw_lock);
1278
1279 host->max_channel = 0;
1280 host->max_id = 16;
1281 host->max_lun = 1;
1282 host->max_cmd_len = 16;
1283
1284 adapter->rev = pdev->revision;
1285
1286 if (pci_request_regions(pdev, "vmw_pvscsi")) {
1287 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1288 goto out_free_host;
1289 }
1290
1291 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1292 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1293 continue;
1294
1295 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1296 continue;
1297
1298 break;
1299 }
1300
1301 if (i == DEVICE_COUNT_RESOURCE) {
1302 printk(KERN_ERR
1303 "vmw_pvscsi: adapter has no suitable MMIO region\n");
1304 goto out_release_resources;
1305 }
1306
1307 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1308
1309 if (!adapter->mmioBase) {
1310 printk(KERN_ERR
1311 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1312 i, PVSCSI_MEM_SPACE_SIZE);
1313 goto out_release_resources;
1314 }
1315
1316 pci_set_master(pdev);
1317 pci_set_drvdata(pdev, host);
1318
1319 ll_adapter_reset(adapter);
1320
1321 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1322
1323 error = pvscsi_allocate_rings(adapter);
1324 if (error) {
1325 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1326 goto out_release_resources;
1327 }
1328
a9310735
AK		 1329 /*
1330 * Ask the device for max number of targets.
1331 */
1332 host->max_id = pvscsi_get_max_targets(adapter);
1333 dev = pvscsi_dev(adapter);
1334 dev_info(dev, "vmw_pvscsi: host->max_id: %u\n", host->max_id);
1335
851b1642
AK		 1336 /*
1337 * From this point on we should reset the adapter if anything goes
1338 * wrong.
1339 */
1340 pvscsi_setup_all_rings(adapter);
1341
1342 adapter->cmd_map = kcalloc(adapter->req_depth,
1343 sizeof(struct pvscsi_ctx), GFP_KERNEL);
1344 if (!adapter->cmd_map) {
1345 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1346 error = -ENOMEM;
1347 goto out_reset_adapter;
1348 }
1349
1350 INIT_LIST_HEAD(&adapter->cmd_pool);
1351 for (i = 0; i < adapter->req_depth; i++) {
1352 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1353 list_add(&ctx->list, &adapter->cmd_pool);
1354 }
1355
1356 error = pvscsi_allocate_sg(adapter);
1357 if (error) {
1358 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1359 goto out_reset_adapter;
1360 }
1361
1362 if (!pvscsi_disable_msix &&
1363 pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1364 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1365 adapter->use_msix = 1;
1366 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1367 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1368 adapter->use_msi = 1;
1369 adapter->irq = pdev->irq;
1370 } else {
1371 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1372 adapter->irq = pdev->irq;
1373 flags = IRQF_SHARED;
1374 }
1375
1376 error = request_irq(adapter->irq, pvscsi_isr, flags,
1377 "vmw_pvscsi", adapter);
1378 if (error) {
1379 printk(KERN_ERR
1380 "vmw_pvscsi: unable to request IRQ: %d\n", error);
1381 adapter->irq = 0;
1382 goto out_reset_adapter;
1383 }
1384
1385 error = scsi_add_host(host, &pdev->dev);
1386 if (error) {
1387 printk(KERN_ERR
1388 "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1389 goto out_reset_adapter;
1390 }
1391
1392 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1393 adapter->rev, host->host_no);
1394
1395 pvscsi_unmask_intr(adapter);
1396
1397 scsi_scan_host(host);
1398
1399 return 0;
1400
1401out_reset_adapter:
1402 ll_adapter_reset(adapter);
1403out_release_resources:
1404 pvscsi_release_resources(adapter);
1405out_free_host:
1406 scsi_host_put(host);
1407out_disable_device:
1408 pci_set_drvdata(pdev, NULL);
1409 pci_disable_device(pdev);
1410
1411 return error;
1412}
1413
1414static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1415{
1416 pvscsi_mask_intr(adapter);
1417
1418 if (adapter->workqueue)
1419 flush_workqueue(adapter->workqueue);
1420
1421 pvscsi_shutdown_intr(adapter);
1422
1423 pvscsi_process_request_ring(adapter);
1424 pvscsi_process_completion_ring(adapter);
1425 ll_adapter_reset(adapter);
1426}
1427
1428static void pvscsi_shutdown(struct pci_dev *dev)
1429{
1430 struct Scsi_Host *host = pci_get_drvdata(dev);
1431 struct pvscsi_adapter *adapter = shost_priv(host);
1432
1433 __pvscsi_shutdown(adapter);
1434}
1435
1436static void pvscsi_remove(struct pci_dev *pdev)
1437{
1438 struct Scsi_Host *host = pci_get_drvdata(pdev);
1439 struct pvscsi_adapter *adapter = shost_priv(host);
1440
1441 scsi_remove_host(host);
1442
1443 __pvscsi_shutdown(adapter);
1444 pvscsi_release_resources(adapter);
1445
1446 scsi_host_put(host);
1447
1448 pci_set_drvdata(pdev, NULL);
1449 pci_disable_device(pdev);
1450}
1451
1452static struct pci_driver pvscsi_pci_driver = {
1453 .name = "vmw_pvscsi",
1454 .id_table = pvscsi_pci_tbl,
1455 .probe = pvscsi_probe,
6f039790 1456 .remove = pvscsi_remove,
851b1642
AK		 1457 .shutdown = pvscsi_shutdown,
1458};
1459
1460static int __init pvscsi_init(void)
1461{
1462 pr_info("%s - version %s\n",
1463 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1464 return pci_register_driver(&pvscsi_pci_driver);
1465}
1466
1467static void __exit pvscsi_exit(void)
1468{
1469 pci_unregister_driver(&pvscsi_pci_driver);
1470}
1471
1472module_init(pvscsi_init);
1473module_exit(pvscsi_exit);
kernel source for telekom puls (alcatel/mediatek)