Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/scsi/vmw_pvscsi.c

  1 /*
  2  * Linux driver for VMware's para-virtualized SCSI HBA.
  3  *
  4  * Copyright (C) 2008-2014, 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: Arvind Kumar <arvindkumar@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 #include <scsi/scsi_tcq.h>
 36 
 37 #include "vmw_pvscsi.h"
 38 
 39 #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
 40 
 41 MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
 42 MODULE_AUTHOR("VMware, Inc.");
 43 MODULE_LICENSE("GPL");
 44 MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
 45 
 46 #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING       8
 47 #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING       1
 48 #define PVSCSI_DEFAULT_QUEUE_DEPTH              254
 49 #define SGL_SIZE                                PAGE_SIZE
 50 
 51 struct pvscsi_sg_list {
 52         struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
 53 };
 54 
 55 struct pvscsi_ctx {
 56         /*
 57          * The index of the context in cmd_map serves as the context ID for a
 58          * 1-to-1 mapping completions back to requests.
 59          */
 60         struct scsi_cmnd        *cmd;
 61         struct pvscsi_sg_list   *sgl;
 62         struct list_head        list;
 63         dma_addr_t              dataPA;
 64         dma_addr_t              sensePA;
 65         dma_addr_t              sglPA;
 66         struct completion       *abort_cmp;
 67 };
 68 
 69 struct pvscsi_adapter {
 70         char                            *mmioBase;
 71         unsigned int                    irq;
 72         u8                              rev;
 73         bool                            use_msi;
 74         bool                            use_msix;
 75         bool                            use_msg;
 76         bool                            use_req_threshold;
 77 
 78         spinlock_t                      hw_lock;
 79 
 80         struct workqueue_struct         *workqueue;
 81         struct work_struct              work;
 82 
 83         struct PVSCSIRingReqDesc        *req_ring;
 84         unsigned                        req_pages;
 85         unsigned                        req_depth;
 86         dma_addr_t                      reqRingPA;
 87 
 88         struct PVSCSIRingCmpDesc        *cmp_ring;
 89         unsigned                        cmp_pages;
 90         dma_addr_t                      cmpRingPA;
 91 
 92         struct PVSCSIRingMsgDesc        *msg_ring;
 93         unsigned                        msg_pages;
 94         dma_addr_t                      msgRingPA;
 95 
 96         struct PVSCSIRingsState         *rings_state;
 97         dma_addr_t                      ringStatePA;
 98 
 99         struct pci_dev                  *dev;
100         struct Scsi_Host                *host;
101 
102         struct list_head                cmd_pool;
103         struct pvscsi_ctx               *cmd_map;
104 };
105 
106 
107 /* Command line parameters */
108 static int pvscsi_ring_pages;
109 static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
110 static int pvscsi_cmd_per_lun    = PVSCSI_DEFAULT_QUEUE_DEPTH;
111 static bool pvscsi_disable_msi;
112 static bool pvscsi_disable_msix;
113 static bool pvscsi_use_msg       = true;
114 static bool pvscsi_use_req_threshold = true;
115 
116 #define PVSCSI_RW (S_IRUSR | S_IWUSR)
117 
118 module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
119 MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
120                  __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING)
121                  "[up to 16 targets],"
122                  __stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES)
123                  "[for 16+ targets])");
124 
125 module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
126 MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
127                  __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
128 
129 module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
130 MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
131                  __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")");
132 
133 module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
134 MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
135 
136 module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
137 MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
138 
139 module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
140 MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
141 
142 module_param_named(use_req_threshold, pvscsi_use_req_threshold,
143                    bool, PVSCSI_RW);
144 MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)");
145 
146 static const struct pci_device_id pvscsi_pci_tbl[] = {
147         { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
148         { 0 }
149 };
150 
151 MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
152 
153 static struct device *
154 pvscsi_dev(const struct pvscsi_adapter *adapter)
155 {
156         return &(adapter->dev->dev);
157 }
158 
159 static struct pvscsi_ctx *
160 pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
161 {
162         struct pvscsi_ctx *ctx, *end;
163 
164         end = &adapter->cmd_map[adapter->req_depth];
165         for (ctx = adapter->cmd_map; ctx < end; ctx++)
166                 if (ctx->cmd == cmd)
167                         return ctx;
168 
169         return NULL;
170 }
171 
172 static struct pvscsi_ctx *
173 pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
174 {
175         struct pvscsi_ctx *ctx;
176 
177         if (list_empty(&adapter->cmd_pool))
178                 return NULL;
179 
180         ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
181         ctx->cmd = cmd;
182         list_del(&ctx->list);
183 
184         return ctx;
185 }
186 
187 static void pvscsi_release_context(struct pvscsi_adapter *adapter,
188                                    struct pvscsi_ctx *ctx)
189 {
190         ctx->cmd = NULL;
191         ctx->abort_cmp = NULL;
192         list_add(&ctx->list, &adapter->cmd_pool);
193 }
194 
195 /*
196  * Map a pvscsi_ctx struct to a context ID field value; we map to a simple
197  * non-zero integer. ctx always points to an entry in cmd_map array, hence
198  * the return value is always >=1.
199  */
200 static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
201                               const struct pvscsi_ctx *ctx)
202 {
203         return ctx - adapter->cmd_map + 1;
204 }
205 
206 static struct pvscsi_ctx *
207 pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
208 {
209         return &adapter->cmd_map[context - 1];
210 }
211 
212 static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
213                              u32 offset, u32 val)
214 {
215         writel(val, adapter->mmioBase + offset);
216 }
217 
218 static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
219 {
220         return readl(adapter->mmioBase + offset);
221 }
222 
223 static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
224 {
225         return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
226 }
227 
228 static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
229                                      u32 val)
230 {
231         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
232 }
233 
234 static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
235 {
236         u32 intr_bits;
237 
238         intr_bits = PVSCSI_INTR_CMPL_MASK;
239         if (adapter->use_msg)
240                 intr_bits |= PVSCSI_INTR_MSG_MASK;
241 
242         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
243 }
244 
245 static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
246 {
247         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
248 }
249 
250 static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
251                                   u32 cmd, const void *desc, size_t len)
252 {
253         const u32 *ptr = desc;
254         size_t i;
255 
256         len /= sizeof(*ptr);
257         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
258         for (i = 0; i < len; i++)
259                 pvscsi_reg_write(adapter,
260                                  PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
261 }
262 
263 static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
264                              const struct pvscsi_ctx *ctx)
265 {
266         struct PVSCSICmdDescAbortCmd cmd = { 0 };
267 
268         cmd.target = ctx->cmd->device->id;
269         cmd.context = pvscsi_map_context(adapter, ctx);
270 
271         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
272 }
273 
274 static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
275 {
276         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
277 }
278 
279 static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
280 {
281         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
282 }
283 
284 static int scsi_is_rw(unsigned char op)
285 {
286         return op == READ_6  || op == WRITE_6 ||
287                op == READ_10 || op == WRITE_10 ||
288                op == READ_12 || op == WRITE_12 ||
289                op == READ_16 || op == WRITE_16;
290 }
291 
292 static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
293                            unsigned char op)
294 {
295         if (scsi_is_rw(op)) {
296                 struct PVSCSIRingsState *s = adapter->rings_state;
297 
298                 if (!adapter->use_req_threshold ||
299                     s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold)
300                         pvscsi_kick_rw_io(adapter);
301         } else {
302                 pvscsi_process_request_ring(adapter);
303         }
304 }
305 
306 static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
307 {
308         dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
309 
310         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
311 }
312 
313 static void ll_bus_reset(const struct pvscsi_adapter *adapter)
314 {
315         dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter);
316 
317         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
318 }
319 
320 static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
321 {
322         struct PVSCSICmdDescResetDevice cmd = { 0 };
323 
324         dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target);
325 
326         cmd.target = target;
327 
328         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
329                               &cmd, sizeof(cmd));
330 }
331 
332 static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
333                              struct scatterlist *sg, unsigned count)
334 {
335         unsigned i;
336         struct PVSCSISGElement *sge;
337 
338         BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
339 
340         sge = &ctx->sgl->sge[0];
341         for (i = 0; i < count; i++, sg++) {
342                 sge[i].addr   = sg_dma_address(sg);
343                 sge[i].length = sg_dma_len(sg);
344                 sge[i].flags  = 0;
345         }
346 }
347 
348 /*
349  * Map all data buffers for a command into PCI space and
350  * setup the scatter/gather list if needed.
351  */
352 static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
353                                struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
354                                struct PVSCSIRingReqDesc *e)
355 {
356         unsigned count;
357         unsigned bufflen = scsi_bufflen(cmd);
358         struct scatterlist *sg;
359 
360         e->dataLen = bufflen;
361         e->dataAddr = 0;
362         if (bufflen == 0)
363                 return;
364 
365         sg = scsi_sglist(cmd);
366         count = scsi_sg_count(cmd);
367         if (count != 0) {
368                 int segs = scsi_dma_map(cmd);
369                 if (segs > 1) {
370                         pvscsi_create_sg(ctx, sg, segs);
371 
372                         e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
373                         ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
374                                                     SGL_SIZE, PCI_DMA_TODEVICE);
375                         e->dataAddr = ctx->sglPA;
376                 } else
377                         e->dataAddr = sg_dma_address(sg);
378         } else {
379                 /*
380                  * In case there is no S/G list, scsi_sglist points
381                  * directly to the buffer.
382                  */
383                 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
384                                              cmd->sc_data_direction);
385                 e->dataAddr = ctx->dataPA;
386         }
387 }
388 
389 static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
390                                  struct pvscsi_ctx *ctx)
391 {
392         struct scsi_cmnd *cmd;
393         unsigned bufflen;
394 
395         cmd = ctx->cmd;
396         bufflen = scsi_bufflen(cmd);
397 
398         if (bufflen != 0) {
399                 unsigned count = scsi_sg_count(cmd);
400 
401                 if (count != 0) {
402                         scsi_dma_unmap(cmd);
403                         if (ctx->sglPA) {
404                                 pci_unmap_single(adapter->dev, ctx->sglPA,
405                                                  SGL_SIZE, PCI_DMA_TODEVICE);
406                                 ctx->sglPA = 0;
407                         }
408                 } else
409                         pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
410                                          cmd->sc_data_direction);
411         }
412         if (cmd->sense_buffer)
413                 pci_unmap_single(adapter->dev, ctx->sensePA,
414                                  SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
415 }
416 
417 static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
418 {
419         adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
420                                                     &adapter->ringStatePA);
421         if (!adapter->rings_state)
422                 return -ENOMEM;
423 
424         adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
425                                  pvscsi_ring_pages);
426         adapter->req_depth = adapter->req_pages
427                                         * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
428         adapter->req_ring = pci_alloc_consistent(adapter->dev,
429                                                  adapter->req_pages * PAGE_SIZE,
430                                                  &adapter->reqRingPA);
431         if (!adapter->req_ring)
432                 return -ENOMEM;
433 
434         adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
435                                  pvscsi_ring_pages);
436         adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
437                                                  adapter->cmp_pages * PAGE_SIZE,
438                                                  &adapter->cmpRingPA);
439         if (!adapter->cmp_ring)
440                 return -ENOMEM;
441 
442         BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE));
443         BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE));
444         BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE));
445 
446         if (!adapter->use_msg)
447                 return 0;
448 
449         adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING,
450                                  pvscsi_msg_ring_pages);
451         adapter->msg_ring = pci_alloc_consistent(adapter->dev,
452                                                  adapter->msg_pages * PAGE_SIZE,
453                                                  &adapter->msgRingPA);
454         if (!adapter->msg_ring)
455                 return -ENOMEM;
456         BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
457 
458         return 0;
459 }
460 
461 static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
462 {
463         struct PVSCSICmdDescSetupRings cmd = { 0 };
464         dma_addr_t base;
465         unsigned i;
466 
467         cmd.ringsStatePPN   = adapter->ringStatePA >> PAGE_SHIFT;
468         cmd.reqRingNumPages = adapter->req_pages;
469         cmd.cmpRingNumPages = adapter->cmp_pages;
470 
471         base = adapter->reqRingPA;
472         for (i = 0; i < adapter->req_pages; i++) {
473                 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
474                 base += PAGE_SIZE;
475         }
476 
477         base = adapter->cmpRingPA;
478         for (i = 0; i < adapter->cmp_pages; i++) {
479                 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
480                 base += PAGE_SIZE;
481         }
482 
483         memset(adapter->rings_state, 0, PAGE_SIZE);
484         memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE);
485         memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE);
486 
487         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
488                               &cmd, sizeof(cmd));
489 
490         if (adapter->use_msg) {
491                 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
492 
493                 cmd_msg.numPages = adapter->msg_pages;
494 
495                 base = adapter->msgRingPA;
496                 for (i = 0; i < adapter->msg_pages; i++) {
497                         cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
498                         base += PAGE_SIZE;
499                 }
500                 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
501 
502                 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
503                                       &cmd_msg, sizeof(cmd_msg));
504         }
505 }
506 
507 static int pvscsi_change_queue_depth(struct scsi_device *sdev,
508                                      int qdepth,
509                                      int reason)
510 {
511         int max_depth;
512         struct Scsi_Host *shost = sdev->host;
513 
514         if (reason != SCSI_QDEPTH_DEFAULT)
515                 /*
516                  * We support only changing default.
517                  */
518                 return -EOPNOTSUPP;
519 
520         max_depth = shost->can_queue;
521         if (!sdev->tagged_supported)
522                 max_depth = 1;
523         if (qdepth > max_depth)
524                 qdepth = max_depth;
525         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
526 
527         if (sdev->inquiry_len > 7)
528                 sdev_printk(KERN_INFO, sdev,
529                             "qdepth(%d), tagged(%d), simple(%d), ordered(%d), scsi_level(%d), cmd_que(%d)\n",
530                             sdev->queue_depth, sdev->tagged_supported,
531                             sdev->simple_tags, sdev->ordered_tags,
532                             sdev->scsi_level, (sdev->inquiry[7] & 2) >> 1);
533         return sdev->queue_depth;
534 }
535 
536 /*
537  * Pull a completion descriptor off and pass the completion back
538  * to the SCSI mid layer.
539  */
540 static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
541                                     const struct PVSCSIRingCmpDesc *e)
542 {
543         struct pvscsi_ctx *ctx;
544         struct scsi_cmnd *cmd;
545         struct completion *abort_cmp;
546         u32 btstat = e->hostStatus;
547         u32 sdstat = e->scsiStatus;
548 
549         ctx = pvscsi_get_context(adapter, e->context);
550         cmd = ctx->cmd;
551         abort_cmp = ctx->abort_cmp;
552         pvscsi_unmap_buffers(adapter, ctx);
553         pvscsi_release_context(adapter, ctx);
554         if (abort_cmp) {
555                 /*
556                  * The command was requested to be aborted. Just signal that
557                  * the request completed and swallow the actual cmd completion
558                  * here. The abort handler will post a completion for this
559                  * command indicating that it got successfully aborted.
560                  */
561                 complete(abort_cmp);
562                 return;
563         }
564 
565         cmd->result = 0;
566         if (sdstat != SAM_STAT_GOOD &&
567             (btstat == BTSTAT_SUCCESS ||
568              btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
569              btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
570                 cmd->result = (DID_OK << 16) | sdstat;
571                 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
572                         cmd->result |= (DRIVER_SENSE << 24);
573         } else
574                 switch (btstat) {
575                 case BTSTAT_SUCCESS:
576                 case BTSTAT_LINKED_COMMAND_COMPLETED:
577                 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
578                         /* If everything went fine, let's move on..  */
579                         cmd->result = (DID_OK << 16);
580                         break;
581 
582                 case BTSTAT_DATARUN:
583                 case BTSTAT_DATA_UNDERRUN:
584                         /* Report residual data in underruns */
585                         scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
586                         cmd->result = (DID_ERROR << 16);
587                         break;
588 
589                 case BTSTAT_SELTIMEO:
590                         /* Our emulation returns this for non-connected devs */
591                         cmd->result = (DID_BAD_TARGET << 16);
592                         break;
593 
594                 case BTSTAT_LUNMISMATCH:
595                 case BTSTAT_TAGREJECT:
596                 case BTSTAT_BADMSG:
597                         cmd->result = (DRIVER_INVALID << 24);
598                         /* fall through */
599 
600                 case BTSTAT_HAHARDWARE:
601                 case BTSTAT_INVPHASE:
602                 case BTSTAT_HATIMEOUT:
603                 case BTSTAT_NORESPONSE:
604                 case BTSTAT_DISCONNECT:
605                 case BTSTAT_HASOFTWARE:
606                 case BTSTAT_BUSFREE:
607                 case BTSTAT_SENSFAILED:
608                         cmd->result |= (DID_ERROR << 16);
609                         break;
610 
611                 case BTSTAT_SENTRST:
612                 case BTSTAT_RECVRST:
613                 case BTSTAT_BUSRESET:
614                         cmd->result = (DID_RESET << 16);
615                         break;
616 
617                 case BTSTAT_ABORTQUEUE:
618                         cmd->result = (DID_ABORT << 16);
619                         break;
620 
621                 case BTSTAT_SCSIPARITY:
622                         cmd->result = (DID_PARITY << 16);
623                         break;
624 
625                 default:
626                         cmd->result = (DID_ERROR << 16);
627                         scmd_printk(KERN_DEBUG, cmd,
628                                     "Unknown completion status: 0x%x\n",
629                                     btstat);
630         }
631 
632         dev_dbg(&cmd->device->sdev_gendev,
633                 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
634                 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
635 
636         cmd->scsi_done(cmd);
637 }
638 
639 /*
640  * barrier usage : Since the PVSCSI device is emulated, there could be cases
641  * where we may want to serialize some accesses between the driver and the
642  * emulation layer. We use compiler barriers instead of the more expensive
643  * memory barriers because PVSCSI is only supported on X86 which has strong
644  * memory access ordering.
645  */
646 static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
647 {
648         struct PVSCSIRingsState *s = adapter->rings_state;
649         struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
650         u32 cmp_entries = s->cmpNumEntriesLog2;
651 
652         while (s->cmpConsIdx != s->cmpProdIdx) {
653                 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
654                                                       MASK(cmp_entries));
655                 /*
656                  * This barrier() ensures that *e is not dereferenced while
657                  * the device emulation still writes data into the slot.
658                  * Since the device emulation advances s->cmpProdIdx only after
659                  * updating the slot we want to check it first.
660                  */
661                 barrier();
662                 pvscsi_complete_request(adapter, e);
663                 /*
664                  * This barrier() ensures that compiler doesn't reorder write
665                  * to s->cmpConsIdx before the read of (*e) inside
666                  * pvscsi_complete_request. Otherwise, device emulation may
667                  * overwrite *e before we had a chance to read it.
668                  */
669                 barrier();
670                 s->cmpConsIdx++;
671         }
672 }
673 
674 /*
675  * Translate a Linux SCSI request into a request ring entry.
676  */
677 static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
678                              struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
679 {
680         struct PVSCSIRingsState *s;
681         struct PVSCSIRingReqDesc *e;
682         struct scsi_device *sdev;
683         u32 req_entries;
684 
685         s = adapter->rings_state;
686         sdev = cmd->device;
687         req_entries = s->reqNumEntriesLog2;
688 
689         /*
690          * If this condition holds, we might have room on the request ring, but
691          * we might not have room on the completion ring for the response.
692          * However, we have already ruled out this possibility - we would not
693          * have successfully allocated a context if it were true, since we only
694          * have one context per request entry.  Check for it anyway, since it
695          * would be a serious bug.
696          */
697         if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
698                 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
699                             "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
700                             s->reqProdIdx, s->cmpConsIdx);
701                 return -1;
702         }
703 
704         e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
705 
706         e->bus    = sdev->channel;
707         e->target = sdev->id;
708         memset(e->lun, 0, sizeof(e->lun));
709         e->lun[1] = sdev->lun;
710 
711         if (cmd->sense_buffer) {
712                 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
713                                               SCSI_SENSE_BUFFERSIZE,
714                                               PCI_DMA_FROMDEVICE);
715                 e->senseAddr = ctx->sensePA;
716                 e->senseLen = SCSI_SENSE_BUFFERSIZE;
717         } else {
718                 e->senseLen  = 0;
719                 e->senseAddr = 0;
720         }
721         e->cdbLen   = cmd->cmd_len;
722         e->vcpuHint = smp_processor_id();
723         memcpy(e->cdb, cmd->cmnd, e->cdbLen);
724 
725         e->tag = SIMPLE_QUEUE_TAG;
726         if (sdev->tagged_supported &&
727             (cmd->tag == HEAD_OF_QUEUE_TAG ||
728              cmd->tag == ORDERED_QUEUE_TAG))
729                 e->tag = cmd->tag;
730 
731         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
732                 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
733         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
734                 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
735         else if (cmd->sc_data_direction == DMA_NONE)
736                 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
737         else
738                 e->flags = 0;
739 
740         pvscsi_map_buffers(adapter, ctx, cmd, e);
741 
742         e->context = pvscsi_map_context(adapter, ctx);
743 
744         barrier();
745 
746         s->reqProdIdx++;
747 
748         return 0;
749 }
750 
751 static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
752 {
753         struct Scsi_Host *host = cmd->device->host;
754         struct pvscsi_adapter *adapter = shost_priv(host);
755         struct pvscsi_ctx *ctx;
756         unsigned long flags;
757 
758         spin_lock_irqsave(&adapter->hw_lock, flags);
759 
760         ctx = pvscsi_acquire_context(adapter, cmd);
761         if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
762                 if (ctx)
763                         pvscsi_release_context(adapter, ctx);
764                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
765                 return SCSI_MLQUEUE_HOST_BUSY;
766         }
767 
768         cmd->scsi_done = done;
769 
770         dev_dbg(&cmd->device->sdev_gendev,
771                 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
772 
773         spin_unlock_irqrestore(&adapter->hw_lock, flags);
774 
775         pvscsi_kick_io(adapter, cmd->cmnd[0]);
776 
777         return 0;
778 }
779 
780 static DEF_SCSI_QCMD(pvscsi_queue)
781 
782 static int pvscsi_abort(struct scsi_cmnd *cmd)
783 {
784         struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
785         struct pvscsi_ctx *ctx;
786         unsigned long flags;
787         int result = SUCCESS;
788         DECLARE_COMPLETION_ONSTACK(abort_cmp);
789 
790         scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
791                     adapter->host->host_no, cmd);
792 
793         spin_lock_irqsave(&adapter->hw_lock, flags);
794 
795         /*
796          * Poll the completion ring first - we might be trying to abort
797          * a command that is waiting to be dispatched in the completion ring.
798          */
799         pvscsi_process_completion_ring(adapter);
800 
801         /*
802          * If there is no context for the command, it either already succeeded
803          * or else was never properly issued.  Not our problem.
804          */
805         ctx = pvscsi_find_context(adapter, cmd);
806         if (!ctx) {
807                 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
808                 goto out;
809         }
810 
811         /*
812          * Mark that the command has been requested to be aborted and issue
813          * the abort.
814          */
815         ctx->abort_cmp = &abort_cmp;
816 
817         pvscsi_abort_cmd(adapter, ctx);
818         spin_unlock_irqrestore(&adapter->hw_lock, flags);
819         /* Wait for 2 secs for the completion. */
820         wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
821         spin_lock_irqsave(&adapter->hw_lock, flags);
822 
823         if (!completion_done(&abort_cmp)) {
824                 /*
825                  * Failed to abort the command, unmark the fact that it
826                  * was requested to be aborted.
827                  */
828                 ctx->abort_cmp = NULL;
829                 result = FAILED;
830                 scmd_printk(KERN_DEBUG, cmd,
831                             "Failed to get completion for aborted cmd %p\n",
832                             cmd);
833                 goto out;
834         }
835 
836         /*
837          * Successfully aborted the command.
838          */
839         cmd->result = (DID_ABORT << 16);
840         cmd->scsi_done(cmd);
841 
842 out:
843         spin_unlock_irqrestore(&adapter->hw_lock, flags);
844         return result;
845 }
846 
847 /*
848  * Abort all outstanding requests.  This is only safe to use if the completion
849  * ring will never be walked again or the device has been reset, because it
850  * destroys the 1-1 mapping between context field passed to emulation and our
851  * request structure.
852  */
853 static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
854 {
855         unsigned i;
856 
857         for (i = 0; i < adapter->req_depth; i++) {
858                 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
859                 struct scsi_cmnd *cmd = ctx->cmd;
860                 if (cmd) {
861                         scmd_printk(KERN_ERR, cmd,
862                                     "Forced reset on cmd %p\n", cmd);
863                         pvscsi_unmap_buffers(adapter, ctx);
864                         pvscsi_release_context(adapter, ctx);
865                         cmd->result = (DID_RESET << 16);
866                         cmd->scsi_done(cmd);
867                 }
868         }
869 }
870 
871 static int pvscsi_host_reset(struct scsi_cmnd *cmd)
872 {
873         struct Scsi_Host *host = cmd->device->host;
874         struct pvscsi_adapter *adapter = shost_priv(host);
875         unsigned long flags;
876         bool use_msg;
877 
878         scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
879 
880         spin_lock_irqsave(&adapter->hw_lock, flags);
881 
882         use_msg = adapter->use_msg;
883 
884         if (use_msg) {
885                 adapter->use_msg = 0;
886                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
887 
888                 /*
889                  * Now that we know that the ISR won't add more work on the
890                  * workqueue we can safely flush any outstanding work.
891                  */
892                 flush_workqueue(adapter->workqueue);
893                 spin_lock_irqsave(&adapter->hw_lock, flags);
894         }
895 
896         /*
897          * We're going to tear down the entire ring structure and set it back
898          * up, so stalling new requests until all completions are flushed and
899          * the rings are back in place.
900          */
901 
902         pvscsi_process_request_ring(adapter);
903 
904         ll_adapter_reset(adapter);
905 
906         /*
907          * Now process any completions.  Note we do this AFTER adapter reset,
908          * which is strange, but stops races where completions get posted
909          * between processing the ring and issuing the reset.  The backend will
910          * not touch the ring memory after reset, so the immediately pre-reset
911          * completion ring state is still valid.
912          */
913         pvscsi_process_completion_ring(adapter);
914 
915         pvscsi_reset_all(adapter);
916         adapter->use_msg = use_msg;
917         pvscsi_setup_all_rings(adapter);
918         pvscsi_unmask_intr(adapter);
919 
920         spin_unlock_irqrestore(&adapter->hw_lock, flags);
921 
922         return SUCCESS;
923 }
924 
925 static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
926 {
927         struct Scsi_Host *host = cmd->device->host;
928         struct pvscsi_adapter *adapter = shost_priv(host);
929         unsigned long flags;
930 
931         scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
932 
933         /*
934          * We don't want to queue new requests for this bus after
935          * flushing all pending requests to emulation, since new
936          * requests could then sneak in during this bus reset phase,
937          * so take the lock now.
938          */
939         spin_lock_irqsave(&adapter->hw_lock, flags);
940 
941         pvscsi_process_request_ring(adapter);
942         ll_bus_reset(adapter);
943         pvscsi_process_completion_ring(adapter);
944 
945         spin_unlock_irqrestore(&adapter->hw_lock, flags);
946 
947         return SUCCESS;
948 }
949 
950 static int pvscsi_device_reset(struct scsi_cmnd *cmd)
951 {
952         struct Scsi_Host *host = cmd->device->host;
953         struct pvscsi_adapter *adapter = shost_priv(host);
954         unsigned long flags;
955 
956         scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
957                     host->host_no, cmd->device->id);
958 
959         /*
960          * We don't want to queue new requests for this device after flushing
961          * all pending requests to emulation, since new requests could then
962          * sneak in during this device reset phase, so take the lock now.
963          */
964         spin_lock_irqsave(&adapter->hw_lock, flags);
965 
966         pvscsi_process_request_ring(adapter);
967         ll_device_reset(adapter, cmd->device->id);
968         pvscsi_process_completion_ring(adapter);
969 
970         spin_unlock_irqrestore(&adapter->hw_lock, flags);
971 
972         return SUCCESS;
973 }
974 
975 static struct scsi_host_template pvscsi_template;
976 
977 static const char *pvscsi_info(struct Scsi_Host *host)
978 {
979         struct pvscsi_adapter *adapter = shost_priv(host);
980         static char buf[256];
981 
982         sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
983                 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
984                 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
985                 pvscsi_template.cmd_per_lun);
986 
987         return buf;
988 }
989 
990 static struct scsi_host_template pvscsi_template = {
991         .module                         = THIS_MODULE,
992         .name                           = "VMware PVSCSI Host Adapter",
993         .proc_name                      = "vmw_pvscsi",
994         .info                           = pvscsi_info,
995         .queuecommand                   = pvscsi_queue,
996         .this_id                        = -1,
997         .sg_tablesize                   = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
998         .dma_boundary                   = UINT_MAX,
999         .max_sectors                    = 0xffff,
1000         .use_clustering                 = ENABLE_CLUSTERING,
1001         .change_queue_depth             = pvscsi_change_queue_depth,
1002         .eh_abort_handler               = pvscsi_abort,
1003         .eh_device_reset_handler        = pvscsi_device_reset,
1004         .eh_bus_reset_handler           = pvscsi_bus_reset,
1005         .eh_host_reset_handler          = pvscsi_host_reset,
1006 };
1007 
1008 static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
1009                                const struct PVSCSIRingMsgDesc *e)
1010 {
1011         struct PVSCSIRingsState *s = adapter->rings_state;
1012         struct Scsi_Host *host = adapter->host;
1013         struct scsi_device *sdev;
1014 
1015         printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
1016                e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
1017 
1018         BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
1019 
1020         if (e->type == PVSCSI_MSG_DEV_ADDED) {
1021                 struct PVSCSIMsgDescDevStatusChanged *desc;
1022                 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
1023 
1024                 printk(KERN_INFO
1025                        "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
1026                        desc->bus, desc->target, desc->lun[1]);
1027 
1028                 if (!scsi_host_get(host))
1029                         return;
1030 
1031                 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1032                                           desc->lun[1]);
1033                 if (sdev) {
1034                         printk(KERN_INFO "vmw_pvscsi: device already exists\n");
1035                         scsi_device_put(sdev);
1036                 } else
1037                         scsi_add_device(adapter->host, desc->bus,
1038                                         desc->target, desc->lun[1]);
1039 
1040                 scsi_host_put(host);
1041         } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
1042                 struct PVSCSIMsgDescDevStatusChanged *desc;
1043                 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
1044 
1045                 printk(KERN_INFO
1046                        "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
1047                        desc->bus, desc->target, desc->lun[1]);
1048 
1049                 if (!scsi_host_get(host))
1050                         return;
1051 
1052                 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1053                                           desc->lun[1]);
1054                 if (sdev) {
1055                         scsi_remove_device(sdev);
1056                         scsi_device_put(sdev);
1057                 } else
1058                         printk(KERN_INFO
1059                                "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
1060                                desc->bus, desc->target, desc->lun[1]);
1061 
1062                 scsi_host_put(host);
1063         }
1064 }
1065 
1066 static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
1067 {
1068         struct PVSCSIRingsState *s = adapter->rings_state;
1069 
1070         return s->msgProdIdx != s->msgConsIdx;
1071 }
1072 
1073 static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
1074 {
1075         struct PVSCSIRingsState *s = adapter->rings_state;
1076         struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
1077         u32 msg_entries = s->msgNumEntriesLog2;
1078 
1079         while (pvscsi_msg_pending(adapter)) {
1080                 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
1081                                                       MASK(msg_entries));
1082 
1083                 barrier();
1084                 pvscsi_process_msg(adapter, e);
1085                 barrier();
1086                 s->msgConsIdx++;
1087         }
1088 }
1089 
1090 static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1091 {
1092         struct pvscsi_adapter *adapter;
1093 
1094         adapter = container_of(data, struct pvscsi_adapter, work);
1095 
1096         pvscsi_process_msg_ring(adapter);
1097 }
1098 
1099 static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1100 {
1101         char name[32];
1102 
1103         if (!pvscsi_use_msg)
1104                 return 0;
1105 
1106         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1107                          PVSCSI_CMD_SETUP_MSG_RING);
1108 
1109         if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1110                 return 0;
1111 
1112         snprintf(name, sizeof(name),
1113                  "vmw_pvscsi_wq_%u", adapter->host->host_no);
1114 
1115         adapter->workqueue = create_singlethread_workqueue(name);
1116         if (!adapter->workqueue) {
1117                 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1118                 return 0;
1119         }
1120         INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1121 
1122         return 1;
1123 }
1124 
1125 static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter,
1126                                       bool enable)
1127 {
1128         u32 val;
1129 
1130         if (!pvscsi_use_req_threshold)
1131                 return false;
1132 
1133         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1134                          PVSCSI_CMD_SETUP_REQCALLTHRESHOLD);
1135         val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS);
1136         if (val == -1) {
1137                 printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n");
1138                 return false;
1139         } else {
1140                 struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 };
1141                 cmd_msg.enable = enable;
1142                 printk(KERN_INFO
1143                        "vmw_pvscsi: %sabling reqCallThreshold\n",
1144                         enable ? "en" : "dis");
1145                 pvscsi_write_cmd_desc(adapter,
1146                                       PVSCSI_CMD_SETUP_REQCALLTHRESHOLD,
1147                                       &cmd_msg, sizeof(cmd_msg));
1148                 return pvscsi_reg_read(adapter,
1149                                        PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0;
1150         }
1151 }
1152 
1153 static irqreturn_t pvscsi_isr(int irq, void *devp)
1154 {
1155         struct pvscsi_adapter *adapter = devp;
1156         int handled;
1157 
1158         if (adapter->use_msi || adapter->use_msix)
1159                 handled = true;
1160         else {
1161                 u32 val = pvscsi_read_intr_status(adapter);
1162                 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1163                 if (handled)
1164                         pvscsi_write_intr_status(devp, val);
1165         }
1166 
1167         if (handled) {
1168                 unsigned long flags;
1169 
1170                 spin_lock_irqsave(&adapter->hw_lock, flags);
1171 
1172                 pvscsi_process_completion_ring(adapter);
1173                 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1174                         queue_work(adapter->workqueue, &adapter->work);
1175 
1176                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1177         }
1178 
1179         return IRQ_RETVAL(handled);
1180 }
1181 
1182 static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1183 {
1184         struct pvscsi_ctx *ctx = adapter->cmd_map;
1185         unsigned i;
1186 
1187         for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1188                 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1189 }
1190 
1191 static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1192                              unsigned int *irq)
1193 {
1194         struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1195         int ret;
1196 
1197         ret = pci_enable_msix(adapter->dev, &entry, 1);
1198         if (ret)
1199                 return ret;
1200 
1201         *irq = entry.vector;
1202 
1203         return 0;
1204 }
1205 
1206 static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1207 {
1208         if (adapter->irq) {
1209                 free_irq(adapter->irq, adapter);
1210                 adapter->irq = 0;
1211         }
1212         if (adapter->use_msi) {
1213                 pci_disable_msi(adapter->dev);
1214                 adapter->use_msi = 0;
1215         } else if (adapter->use_msix) {
1216                 pci_disable_msix(adapter->dev);
1217                 adapter->use_msix = 0;
1218         }
1219 }
1220 
1221 static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1222 {
1223         pvscsi_shutdown_intr(adapter);
1224 
1225         if (adapter->workqueue)
1226                 destroy_workqueue(adapter->workqueue);
1227 
1228         if (adapter->mmioBase)
1229                 pci_iounmap(adapter->dev, adapter->mmioBase);
1230 
1231         pci_release_regions(adapter->dev);
1232 
1233         if (adapter->cmd_map) {
1234                 pvscsi_free_sgls(adapter);
1235                 kfree(adapter->cmd_map);
1236         }
1237 
1238         if (adapter->rings_state)
1239                 pci_free_consistent(adapter->dev, PAGE_SIZE,
1240                                     adapter->rings_state, adapter->ringStatePA);
1241 
1242         if (adapter->req_ring)
1243                 pci_free_consistent(adapter->dev,
1244                                     adapter->req_pages * PAGE_SIZE,
1245                                     adapter->req_ring, adapter->reqRingPA);
1246 
1247         if (adapter->cmp_ring)
1248                 pci_free_consistent(adapter->dev,
1249                                     adapter->cmp_pages * PAGE_SIZE,
1250                                     adapter->cmp_ring, adapter->cmpRingPA);
1251 
1252         if (adapter->msg_ring)
1253                 pci_free_consistent(adapter->dev,
1254                                     adapter->msg_pages * PAGE_SIZE,
1255                                     adapter->msg_ring, adapter->msgRingPA);
1256 }
1257 
1258 /*
1259  * Allocate scatter gather lists.
1260  *
1261  * These are statically allocated.  Trying to be clever was not worth it.
1262  *
1263  * Dynamic allocation can fail, and we can't go deep into the memory
1264  * allocator, since we're a SCSI driver, and trying too hard to allocate
1265  * memory might generate disk I/O.  We also don't want to fail disk I/O
1266  * in that case because we can't get an allocation - the I/O could be
1267  * trying to swap out data to free memory.  Since that is pathological,
1268  * just use a statically allocated scatter list.
1269  *
1270  */
1271 static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1272 {
1273         struct pvscsi_ctx *ctx;
1274         int i;
1275 
1276         ctx = adapter->cmd_map;
1277         BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1278 
1279         for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1280                 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1281                                                     get_order(SGL_SIZE));
1282                 ctx->sglPA = 0;
1283                 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1284                 if (!ctx->sgl) {
1285                         for (; i >= 0; --i, --ctx) {
1286                                 free_pages((unsigned long)ctx->sgl,
1287                                            get_order(SGL_SIZE));
1288                                 ctx->sgl = NULL;
1289                         }
1290                         return -ENOMEM;
1291                 }
1292         }
1293 
1294         return 0;
1295 }
1296 
1297 /*
1298  * Query the device, fetch the config info and return the
1299  * maximum number of targets on the adapter. In case of
1300  * failure due to any reason return default i.e. 16.
1301  */
1302 static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)
1303 {
1304         struct PVSCSICmdDescConfigCmd cmd;
1305         struct PVSCSIConfigPageHeader *header;
1306         struct device *dev;
1307         dma_addr_t configPagePA;
1308         void *config_page;
1309         u32 numPhys = 16;
1310 
1311         dev = pvscsi_dev(adapter);
1312         config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
1313                                            &configPagePA);
1314         if (!config_page) {
1315                 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n");
1316                 goto exit;
1317         }
1318         BUG_ON(configPagePA & ~PAGE_MASK);
1319 
1320         /* Fetch config info from the device. */
1321         cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32;
1322         cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;
1323         cmd.cmpAddr = configPagePA;
1324         cmd._pad = 0;
1325 
1326         /*
1327          * Mark the completion page header with error values. If the device
1328          * completes the command successfully, it sets the status values to
1329          * indicate success.
1330          */
1331         header = config_page;
1332         memset(header, 0, sizeof *header);
1333         header->hostStatus = BTSTAT_INVPARAM;
1334         header->scsiStatus = SDSTAT_CHECK;
1335 
1336         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd);
1337 
1338         if (header->hostStatus == BTSTAT_SUCCESS &&
1339             header->scsiStatus == SDSTAT_GOOD) {
1340                 struct PVSCSIConfigPageController *config;
1341 
1342                 config = config_page;
1343                 numPhys = config->numPhys;
1344         } else
1345                 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n",
1346                          header->hostStatus, header->scsiStatus);
1347         pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA);
1348 exit:
1349         return numPhys;
1350 }
1351 
1352 static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1353 {
1354         struct pvscsi_adapter *adapter;
1355         struct pvscsi_adapter adapter_temp;
1356         struct Scsi_Host *host = NULL;
1357         unsigned int i;
1358         unsigned long flags = 0;
1359         int error;
1360         u32 max_id;
1361 
1362         error = -ENODEV;
1363 
1364         if (pci_enable_device(pdev))
1365                 return error;
1366 
1367         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1368             pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1369                 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1370         } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1371                    pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1372                 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1373         } else {
1374                 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1375                 goto out_disable_device;
1376         }
1377 
1378         /*
1379          * Let's use a temp pvscsi_adapter struct until we find the number of
1380          * targets on the adapter, after that we will switch to the real
1381          * allocated struct.
1382          */
1383         adapter = &adapter_temp;
1384         memset(adapter, 0, sizeof(*adapter));
1385         adapter->dev  = pdev;
1386         adapter->rev = pdev->revision;
1387 
1388         if (pci_request_regions(pdev, "vmw_pvscsi")) {
1389                 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1390                 goto out_disable_device;
1391         }
1392 
1393         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1394                 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1395                         continue;
1396 
1397                 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1398                         continue;
1399 
1400                 break;
1401         }
1402 
1403         if (i == DEVICE_COUNT_RESOURCE) {
1404                 printk(KERN_ERR
1405                        "vmw_pvscsi: adapter has no suitable MMIO region\n");
1406                 goto out_release_resources_and_disable;
1407         }
1408 
1409         adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1410 
1411         if (!adapter->mmioBase) {
1412                 printk(KERN_ERR
1413                        "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1414                        i, PVSCSI_MEM_SPACE_SIZE);
1415                 goto out_release_resources_and_disable;
1416         }
1417 
1418         pci_set_master(pdev);
1419 
1420         /*
1421          * Ask the device for max number of targets before deciding the
1422          * default pvscsi_ring_pages value.
1423          */
1424         max_id = pvscsi_get_max_targets(adapter);
1425         printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id);
1426 
1427         if (pvscsi_ring_pages == 0)
1428                 /*
1429                  * Set the right default value. Up to 16 it is 8, above it is
1430                  * max.
1431                  */
1432                 pvscsi_ring_pages = (max_id > 16) ?
1433                         PVSCSI_SETUP_RINGS_MAX_NUM_PAGES :
1434                         PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
1435         printk(KERN_INFO
1436                "vmw_pvscsi: setting ring_pages to %d\n",
1437                pvscsi_ring_pages);
1438 
1439         pvscsi_template.can_queue =
1440                 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1441                 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1442         pvscsi_template.cmd_per_lun =
1443                 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1444         host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1445         if (!host) {
1446                 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1447                 goto out_release_resources_and_disable;
1448         }
1449 
1450         /*
1451          * Let's use the real pvscsi_adapter struct here onwards.
1452          */
1453         adapter = shost_priv(host);
1454         memset(adapter, 0, sizeof(*adapter));
1455         adapter->dev  = pdev;
1456         adapter->host = host;
1457         /*
1458          * Copy back what we already have to the allocated adapter struct.
1459          */
1460         adapter->rev = adapter_temp.rev;
1461         adapter->mmioBase = adapter_temp.mmioBase;
1462 
1463         spin_lock_init(&adapter->hw_lock);
1464         host->max_channel = 0;
1465         host->max_lun     = 1;
1466         host->max_cmd_len = 16;
1467         host->max_id      = max_id;
1468 
1469         pci_set_drvdata(pdev, host);
1470 
1471         ll_adapter_reset(adapter);
1472 
1473         adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1474 
1475         error = pvscsi_allocate_rings(adapter);
1476         if (error) {
1477                 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1478                 goto out_release_resources;
1479         }
1480 
1481         /*
1482          * From this point on we should reset the adapter if anything goes
1483          * wrong.
1484          */
1485         pvscsi_setup_all_rings(adapter);
1486 
1487         adapter->cmd_map = kcalloc(adapter->req_depth,
1488                                    sizeof(struct pvscsi_ctx), GFP_KERNEL);
1489         if (!adapter->cmd_map) {
1490                 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1491                 error = -ENOMEM;
1492                 goto out_reset_adapter;
1493         }
1494 
1495         INIT_LIST_HEAD(&adapter->cmd_pool);
1496         for (i = 0; i < adapter->req_depth; i++) {
1497                 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1498                 list_add(&ctx->list, &adapter->cmd_pool);
1499         }
1500 
1501         error = pvscsi_allocate_sg(adapter);
1502         if (error) {
1503                 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1504                 goto out_reset_adapter;
1505         }
1506 
1507         if (!pvscsi_disable_msix &&
1508             pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1509                 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1510                 adapter->use_msix = 1;
1511         } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1512                 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1513                 adapter->use_msi = 1;
1514                 adapter->irq = pdev->irq;
1515         } else {
1516                 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1517                 adapter->irq = pdev->irq;
1518                 flags = IRQF_SHARED;
1519         }
1520 
1521         adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true);
1522         printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n",
1523                adapter->use_req_threshold ? "en" : "dis");
1524 
1525         error = request_irq(adapter->irq, pvscsi_isr, flags,
1526                             "vmw_pvscsi", adapter);
1527         if (error) {
1528                 printk(KERN_ERR
1529                        "vmw_pvscsi: unable to request IRQ: %d\n", error);
1530                 adapter->irq = 0;
1531                 goto out_reset_adapter;
1532         }
1533 
1534         error = scsi_add_host(host, &pdev->dev);
1535         if (error) {
1536                 printk(KERN_ERR
1537                        "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1538                 goto out_reset_adapter;
1539         }
1540 
1541         dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1542                  adapter->rev, host->host_no);
1543 
1544         pvscsi_unmask_intr(adapter);
1545 
1546         scsi_scan_host(host);
1547 
1548         return 0;
1549 
1550 out_reset_adapter:
1551         ll_adapter_reset(adapter);
1552 out_release_resources:
1553         pvscsi_release_resources(adapter);
1554         scsi_host_put(host);
1555 out_disable_device:
1556         pci_disable_device(pdev);
1557 
1558         return error;
1559 
1560 out_release_resources_and_disable:
1561         pvscsi_release_resources(adapter);
1562         goto out_disable_device;
1563 }
1564 
1565 static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1566 {
1567         pvscsi_mask_intr(adapter);
1568 
1569         if (adapter->workqueue)
1570                 flush_workqueue(adapter->workqueue);
1571 
1572         pvscsi_shutdown_intr(adapter);
1573 
1574         pvscsi_process_request_ring(adapter);
1575         pvscsi_process_completion_ring(adapter);
1576         ll_adapter_reset(adapter);
1577 }
1578 
1579 static void pvscsi_shutdown(struct pci_dev *dev)
1580 {
1581         struct Scsi_Host *host = pci_get_drvdata(dev);
1582         struct pvscsi_adapter *adapter = shost_priv(host);
1583 
1584         __pvscsi_shutdown(adapter);
1585 }
1586 
1587 static void pvscsi_remove(struct pci_dev *pdev)
1588 {
1589         struct Scsi_Host *host = pci_get_drvdata(pdev);
1590         struct pvscsi_adapter *adapter = shost_priv(host);
1591 
1592         scsi_remove_host(host);
1593 
1594         __pvscsi_shutdown(adapter);
1595         pvscsi_release_resources(adapter);
1596 
1597         scsi_host_put(host);
1598 
1599         pci_disable_device(pdev);
1600 }
1601 
1602 static struct pci_driver pvscsi_pci_driver = {
1603         .name           = "vmw_pvscsi",
1604         .id_table       = pvscsi_pci_tbl,
1605         .probe          = pvscsi_probe,
1606         .remove         = pvscsi_remove,
1607         .shutdown       = pvscsi_shutdown,
1608 };
1609 
1610 static int __init pvscsi_init(void)
1611 {
1612         pr_info("%s - version %s\n",
1613                 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1614         return pci_register_driver(&pvscsi_pci_driver);
1615 }
1616 
1617 static void __exit pvscsi_exit(void)
1618 {
1619         pci_unregister_driver(&pvscsi_pci_driver);
1620 }
1621 
1622 module_init(pvscsi_init);
1623 module_exit(pvscsi_exit);
1624 

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