config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / drivers / scsi / vmw_pvscsi.c
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/slab.h>
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
40 MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
41 MODULE_AUTHOR("VMware, Inc.");
42 MODULE_LICENSE("GPL");
43 MODULE_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
50 struct pvscsi_sg_list {
51         struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
52 };
53
54 struct 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
67 struct 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 */
105 static int pvscsi_ring_pages     = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
106 static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
107 static int pvscsi_cmd_per_lun    = PVSCSI_DEFAULT_QUEUE_DEPTH;
108 static bool pvscsi_disable_msi;
109 static bool pvscsi_disable_msix;
110 static bool pvscsi_use_msg       = true;
111
112 #define PVSCSI_RW (S_IRUSR | S_IWUSR)
113
114 module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
115 MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
116                  __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")");
117
118 module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
119 MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
120                  __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
121
122 module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
123 MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
124                  __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
125
126 module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
127 MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
128
129 module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
130 MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
131
132 module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
133 MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
134
135 static const struct pci_device_id pvscsi_pci_tbl[] = {
136         { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
137         { 0 }
138 };
139
140 MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
141
142 static struct device *
143 pvscsi_dev(const struct pvscsi_adapter *adapter)
144 {
145         return &(adapter->dev->dev);
146 }
147
148 static struct pvscsi_ctx *
149 pvscsi_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
161 static struct pvscsi_ctx *
162 pvscsi_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
176 static 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  */
188 static 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
194 static struct pvscsi_ctx *
195 pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
196 {
197         return &adapter->cmd_map[context - 1];
198 }
199
200 static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
201                              u32 offset, u32 val)
202 {
203         writel(val, adapter->mmioBase + offset);
204 }
205
206 static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
207 {
208         return readl(adapter->mmioBase + offset);
209 }
210
211 static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
212 {
213         return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
214 }
215
216 static 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
222 static 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
233 static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
234 {
235         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
236 }
237
238 static 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
251 static 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
262 static 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
267 static 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
272 static 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
280 static 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
289 static 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
296 static 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
303 static 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
315 static 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  */
335 static 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
372 static 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
400 static 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
444 static 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  */
494 static 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  */
588 static 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  */
619 static 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
693 static int pvscsi_queue_lck(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
722 static DEF_SCSI_QCMD(pvscsi_queue)
723
724 static 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
755 out:
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  */
766 static 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
784 static 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
838 static 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
863 static 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
888 static struct scsi_host_template pvscsi_template;
889
890 static 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
903 static 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
920 static 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
978 static 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
985 static 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
1002 static 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
1011 static 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
1037 static 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
1066 static 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
1075 static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1076                              unsigned int *irq)
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
1090 static 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
1105 static 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  *
1147  * Dynamic allocation can fail, and we can't go deeep into the memory
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  */
1155 static int __devinit pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
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
1181 static int __devinit pvscsi_probe(struct pci_dev *pdev,
1182                                   const struct pci_device_id *id)
1183 {
1184         struct pvscsi_adapter *adapter;
1185         struct Scsi_Host *host;
1186         unsigned int i;
1187         unsigned long flags = 0;
1188         int error;
1189
1190         error = -ENODEV;
1191
1192         if (pci_enable_device(pdev))
1193                 return error;
1194
1195         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1196             pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1197                 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1198         } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1199                    pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1200                 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1201         } else {
1202                 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1203                 goto out_disable_device;
1204         }
1205
1206         pvscsi_template.can_queue =
1207                 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1208                 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1209         pvscsi_template.cmd_per_lun =
1210                 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1211         host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1212         if (!host) {
1213                 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1214                 goto out_disable_device;
1215         }
1216
1217         adapter = shost_priv(host);
1218         memset(adapter, 0, sizeof(*adapter));
1219         adapter->dev  = pdev;
1220         adapter->host = host;
1221
1222         spin_lock_init(&adapter->hw_lock);
1223
1224         host->max_channel = 0;
1225         host->max_id      = 16;
1226         host->max_lun     = 1;
1227         host->max_cmd_len = 16;
1228
1229         adapter->rev = pdev->revision;
1230
1231         if (pci_request_regions(pdev, "vmw_pvscsi")) {
1232                 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1233                 goto out_free_host;
1234         }
1235
1236         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1237                 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1238                         continue;
1239
1240                 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1241                         continue;
1242
1243                 break;
1244         }
1245
1246         if (i == DEVICE_COUNT_RESOURCE) {
1247                 printk(KERN_ERR
1248                        "vmw_pvscsi: adapter has no suitable MMIO region\n");
1249                 goto out_release_resources;
1250         }
1251
1252         adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1253
1254         if (!adapter->mmioBase) {
1255                 printk(KERN_ERR
1256                        "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1257                        i, PVSCSI_MEM_SPACE_SIZE);
1258                 goto out_release_resources;
1259         }
1260
1261         pci_set_master(pdev);
1262         pci_set_drvdata(pdev, host);
1263
1264         ll_adapter_reset(adapter);
1265
1266         adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1267
1268         error = pvscsi_allocate_rings(adapter);
1269         if (error) {
1270                 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1271                 goto out_release_resources;
1272         }
1273
1274         /*
1275          * From this point on we should reset the adapter if anything goes
1276          * wrong.
1277          */
1278         pvscsi_setup_all_rings(adapter);
1279
1280         adapter->cmd_map = kcalloc(adapter->req_depth,
1281                                    sizeof(struct pvscsi_ctx), GFP_KERNEL);
1282         if (!adapter->cmd_map) {
1283                 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1284                 error = -ENOMEM;
1285                 goto out_reset_adapter;
1286         }
1287
1288         INIT_LIST_HEAD(&adapter->cmd_pool);
1289         for (i = 0; i < adapter->req_depth; i++) {
1290                 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1291                 list_add(&ctx->list, &adapter->cmd_pool);
1292         }
1293
1294         error = pvscsi_allocate_sg(adapter);
1295         if (error) {
1296                 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1297                 goto out_reset_adapter;
1298         }
1299
1300         if (!pvscsi_disable_msix &&
1301             pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1302                 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1303                 adapter->use_msix = 1;
1304         } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1305                 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1306                 adapter->use_msi = 1;
1307                 adapter->irq = pdev->irq;
1308         } else {
1309                 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1310                 adapter->irq = pdev->irq;
1311                 flags = IRQF_SHARED;
1312         }
1313
1314         error = request_irq(adapter->irq, pvscsi_isr, flags,
1315                             "vmw_pvscsi", adapter);
1316         if (error) {
1317                 printk(KERN_ERR
1318                        "vmw_pvscsi: unable to request IRQ: %d\n", error);
1319                 adapter->irq = 0;
1320                 goto out_reset_adapter;
1321         }
1322
1323         error = scsi_add_host(host, &pdev->dev);
1324         if (error) {
1325                 printk(KERN_ERR
1326                        "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1327                 goto out_reset_adapter;
1328         }
1329
1330         dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1331                  adapter->rev, host->host_no);
1332
1333         pvscsi_unmask_intr(adapter);
1334
1335         scsi_scan_host(host);
1336
1337         return 0;
1338
1339 out_reset_adapter:
1340         ll_adapter_reset(adapter);
1341 out_release_resources:
1342         pvscsi_release_resources(adapter);
1343 out_free_host:
1344         scsi_host_put(host);
1345 out_disable_device:
1346         pci_set_drvdata(pdev, NULL);
1347         pci_disable_device(pdev);
1348
1349         return error;
1350 }
1351
1352 static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1353 {
1354         pvscsi_mask_intr(adapter);
1355
1356         if (adapter->workqueue)
1357                 flush_workqueue(adapter->workqueue);
1358
1359         pvscsi_shutdown_intr(adapter);
1360
1361         pvscsi_process_request_ring(adapter);
1362         pvscsi_process_completion_ring(adapter);
1363         ll_adapter_reset(adapter);
1364 }
1365
1366 static void pvscsi_shutdown(struct pci_dev *dev)
1367 {
1368         struct Scsi_Host *host = pci_get_drvdata(dev);
1369         struct pvscsi_adapter *adapter = shost_priv(host);
1370
1371         __pvscsi_shutdown(adapter);
1372 }
1373
1374 static void pvscsi_remove(struct pci_dev *pdev)
1375 {
1376         struct Scsi_Host *host = pci_get_drvdata(pdev);
1377         struct pvscsi_adapter *adapter = shost_priv(host);
1378
1379         scsi_remove_host(host);
1380
1381         __pvscsi_shutdown(adapter);
1382         pvscsi_release_resources(adapter);
1383
1384         scsi_host_put(host);
1385
1386         pci_set_drvdata(pdev, NULL);
1387         pci_disable_device(pdev);
1388 }
1389
1390 static struct pci_driver pvscsi_pci_driver = {
1391         .name           = "vmw_pvscsi",
1392         .id_table       = pvscsi_pci_tbl,
1393         .probe          = pvscsi_probe,
1394         .remove         = __devexit_p(pvscsi_remove),
1395         .shutdown       = pvscsi_shutdown,
1396 };
1397
1398 static int __init pvscsi_init(void)
1399 {
1400         pr_info("%s - version %s\n",
1401                 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1402         return pci_register_driver(&pvscsi_pci_driver);
1403 }
1404
1405 static void __exit pvscsi_exit(void)
1406 {
1407         pci_unregister_driver(&pvscsi_pci_driver);
1408 }
1409
1410 module_init(pvscsi_init);
1411 module_exit(pvscsi_exit);