Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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, int qdepth)
508 {
509         if (!sdev->tagged_supported)
510                 qdepth = 1;
511         return scsi_change_queue_depth(sdev, qdepth);
512 }
513 
514 /*
515  * Pull a completion descriptor off and pass the completion back
516  * to the SCSI mid layer.
517  */
518 static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
519                                     const struct PVSCSIRingCmpDesc *e)
520 {
521         struct pvscsi_ctx *ctx;
522         struct scsi_cmnd *cmd;
523         struct completion *abort_cmp;
524         u32 btstat = e->hostStatus;
525         u32 sdstat = e->scsiStatus;
526 
527         ctx = pvscsi_get_context(adapter, e->context);
528         cmd = ctx->cmd;
529         abort_cmp = ctx->abort_cmp;
530         pvscsi_unmap_buffers(adapter, ctx);
531         pvscsi_release_context(adapter, ctx);
532         if (abort_cmp) {
533                 /*
534                  * The command was requested to be aborted. Just signal that
535                  * the request completed and swallow the actual cmd completion
536                  * here. The abort handler will post a completion for this
537                  * command indicating that it got successfully aborted.
538                  */
539                 complete(abort_cmp);
540                 return;
541         }
542 
543         cmd->result = 0;
544         if (sdstat != SAM_STAT_GOOD &&
545             (btstat == BTSTAT_SUCCESS ||
546              btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
547              btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
548                 cmd->result = (DID_OK << 16) | sdstat;
549                 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
550                         cmd->result |= (DRIVER_SENSE << 24);
551         } else
552                 switch (btstat) {
553                 case BTSTAT_SUCCESS:
554                 case BTSTAT_LINKED_COMMAND_COMPLETED:
555                 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
556                         /* If everything went fine, let's move on..  */
557                         cmd->result = (DID_OK << 16);
558                         break;
559 
560                 case BTSTAT_DATARUN:
561                 case BTSTAT_DATA_UNDERRUN:
562                         /* Report residual data in underruns */
563                         scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
564                         cmd->result = (DID_ERROR << 16);
565                         break;
566 
567                 case BTSTAT_SELTIMEO:
568                         /* Our emulation returns this for non-connected devs */
569                         cmd->result = (DID_BAD_TARGET << 16);
570                         break;
571 
572                 case BTSTAT_LUNMISMATCH:
573                 case BTSTAT_TAGREJECT:
574                 case BTSTAT_BADMSG:
575                         cmd->result = (DRIVER_INVALID << 24);
576                         /* fall through */
577 
578                 case BTSTAT_HAHARDWARE:
579                 case BTSTAT_INVPHASE:
580                 case BTSTAT_HATIMEOUT:
581                 case BTSTAT_NORESPONSE:
582                 case BTSTAT_DISCONNECT:
583                 case BTSTAT_HASOFTWARE:
584                 case BTSTAT_BUSFREE:
585                 case BTSTAT_SENSFAILED:
586                         cmd->result |= (DID_ERROR << 16);
587                         break;
588 
589                 case BTSTAT_SENTRST:
590                 case BTSTAT_RECVRST:
591                 case BTSTAT_BUSRESET:
592                         cmd->result = (DID_RESET << 16);
593                         break;
594 
595                 case BTSTAT_ABORTQUEUE:
596                         cmd->result = (DID_ABORT << 16);
597                         break;
598 
599                 case BTSTAT_SCSIPARITY:
600                         cmd->result = (DID_PARITY << 16);
601                         break;
602 
603                 default:
604                         cmd->result = (DID_ERROR << 16);
605                         scmd_printk(KERN_DEBUG, cmd,
606                                     "Unknown completion status: 0x%x\n",
607                                     btstat);
608         }
609 
610         dev_dbg(&cmd->device->sdev_gendev,
611                 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
612                 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
613 
614         cmd->scsi_done(cmd);
615 }
616 
617 /*
618  * barrier usage : Since the PVSCSI device is emulated, there could be cases
619  * where we may want to serialize some accesses between the driver and the
620  * emulation layer. We use compiler barriers instead of the more expensive
621  * memory barriers because PVSCSI is only supported on X86 which has strong
622  * memory access ordering.
623  */
624 static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
625 {
626         struct PVSCSIRingsState *s = adapter->rings_state;
627         struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
628         u32 cmp_entries = s->cmpNumEntriesLog2;
629 
630         while (s->cmpConsIdx != s->cmpProdIdx) {
631                 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
632                                                       MASK(cmp_entries));
633                 /*
634                  * This barrier() ensures that *e is not dereferenced while
635                  * the device emulation still writes data into the slot.
636                  * Since the device emulation advances s->cmpProdIdx only after
637                  * updating the slot we want to check it first.
638                  */
639                 barrier();
640                 pvscsi_complete_request(adapter, e);
641                 /*
642                  * This barrier() ensures that compiler doesn't reorder write
643                  * to s->cmpConsIdx before the read of (*e) inside
644                  * pvscsi_complete_request. Otherwise, device emulation may
645                  * overwrite *e before we had a chance to read it.
646                  */
647                 barrier();
648                 s->cmpConsIdx++;
649         }
650 }
651 
652 /*
653  * Translate a Linux SCSI request into a request ring entry.
654  */
655 static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
656                              struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
657 {
658         struct PVSCSIRingsState *s;
659         struct PVSCSIRingReqDesc *e;
660         struct scsi_device *sdev;
661         u32 req_entries;
662 
663         s = adapter->rings_state;
664         sdev = cmd->device;
665         req_entries = s->reqNumEntriesLog2;
666 
667         /*
668          * If this condition holds, we might have room on the request ring, but
669          * we might not have room on the completion ring for the response.
670          * However, we have already ruled out this possibility - we would not
671          * have successfully allocated a context if it were true, since we only
672          * have one context per request entry.  Check for it anyway, since it
673          * would be a serious bug.
674          */
675         if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
676                 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
677                             "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
678                             s->reqProdIdx, s->cmpConsIdx);
679                 return -1;
680         }
681 
682         e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
683 
684         e->bus    = sdev->channel;
685         e->target = sdev->id;
686         memset(e->lun, 0, sizeof(e->lun));
687         e->lun[1] = sdev->lun;
688 
689         if (cmd->sense_buffer) {
690                 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
691                                               SCSI_SENSE_BUFFERSIZE,
692                                               PCI_DMA_FROMDEVICE);
693                 e->senseAddr = ctx->sensePA;
694                 e->senseLen = SCSI_SENSE_BUFFERSIZE;
695         } else {
696                 e->senseLen  = 0;
697                 e->senseAddr = 0;
698         }
699         e->cdbLen   = cmd->cmd_len;
700         e->vcpuHint = smp_processor_id();
701         memcpy(e->cdb, cmd->cmnd, e->cdbLen);
702 
703         e->tag = SIMPLE_QUEUE_TAG;
704 
705         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
706                 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
707         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
708                 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
709         else if (cmd->sc_data_direction == DMA_NONE)
710                 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
711         else
712                 e->flags = 0;
713 
714         pvscsi_map_buffers(adapter, ctx, cmd, e);
715 
716         e->context = pvscsi_map_context(adapter, ctx);
717 
718         barrier();
719 
720         s->reqProdIdx++;
721 
722         return 0;
723 }
724 
725 static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
726 {
727         struct Scsi_Host *host = cmd->device->host;
728         struct pvscsi_adapter *adapter = shost_priv(host);
729         struct pvscsi_ctx *ctx;
730         unsigned long flags;
731 
732         spin_lock_irqsave(&adapter->hw_lock, flags);
733 
734         ctx = pvscsi_acquire_context(adapter, cmd);
735         if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
736                 if (ctx)
737                         pvscsi_release_context(adapter, ctx);
738                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
739                 return SCSI_MLQUEUE_HOST_BUSY;
740         }
741 
742         cmd->scsi_done = done;
743 
744         dev_dbg(&cmd->device->sdev_gendev,
745                 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
746 
747         spin_unlock_irqrestore(&adapter->hw_lock, flags);
748 
749         pvscsi_kick_io(adapter, cmd->cmnd[0]);
750 
751         return 0;
752 }
753 
754 static DEF_SCSI_QCMD(pvscsi_queue)
755 
756 static int pvscsi_abort(struct scsi_cmnd *cmd)
757 {
758         struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
759         struct pvscsi_ctx *ctx;
760         unsigned long flags;
761         int result = SUCCESS;
762         DECLARE_COMPLETION_ONSTACK(abort_cmp);
763 
764         scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
765                     adapter->host->host_no, cmd);
766 
767         spin_lock_irqsave(&adapter->hw_lock, flags);
768 
769         /*
770          * Poll the completion ring first - we might be trying to abort
771          * a command that is waiting to be dispatched in the completion ring.
772          */
773         pvscsi_process_completion_ring(adapter);
774 
775         /*
776          * If there is no context for the command, it either already succeeded
777          * or else was never properly issued.  Not our problem.
778          */
779         ctx = pvscsi_find_context(adapter, cmd);
780         if (!ctx) {
781                 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
782                 goto out;
783         }
784 
785         /*
786          * Mark that the command has been requested to be aborted and issue
787          * the abort.
788          */
789         ctx->abort_cmp = &abort_cmp;
790 
791         pvscsi_abort_cmd(adapter, ctx);
792         spin_unlock_irqrestore(&adapter->hw_lock, flags);
793         /* Wait for 2 secs for the completion. */
794         wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
795         spin_lock_irqsave(&adapter->hw_lock, flags);
796 
797         if (!completion_done(&abort_cmp)) {
798                 /*
799                  * Failed to abort the command, unmark the fact that it
800                  * was requested to be aborted.
801                  */
802                 ctx->abort_cmp = NULL;
803                 result = FAILED;
804                 scmd_printk(KERN_DEBUG, cmd,
805                             "Failed to get completion for aborted cmd %p\n",
806                             cmd);
807                 goto out;
808         }
809 
810         /*
811          * Successfully aborted the command.
812          */
813         cmd->result = (DID_ABORT << 16);
814         cmd->scsi_done(cmd);
815 
816 out:
817         spin_unlock_irqrestore(&adapter->hw_lock, flags);
818         return result;
819 }
820 
821 /*
822  * Abort all outstanding requests.  This is only safe to use if the completion
823  * ring will never be walked again or the device has been reset, because it
824  * destroys the 1-1 mapping between context field passed to emulation and our
825  * request structure.
826  */
827 static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
828 {
829         unsigned i;
830 
831         for (i = 0; i < adapter->req_depth; i++) {
832                 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
833                 struct scsi_cmnd *cmd = ctx->cmd;
834                 if (cmd) {
835                         scmd_printk(KERN_ERR, cmd,
836                                     "Forced reset on cmd %p\n", cmd);
837                         pvscsi_unmap_buffers(adapter, ctx);
838                         pvscsi_release_context(adapter, ctx);
839                         cmd->result = (DID_RESET << 16);
840                         cmd->scsi_done(cmd);
841                 }
842         }
843 }
844 
845 static int pvscsi_host_reset(struct scsi_cmnd *cmd)
846 {
847         struct Scsi_Host *host = cmd->device->host;
848         struct pvscsi_adapter *adapter = shost_priv(host);
849         unsigned long flags;
850         bool use_msg;
851 
852         scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
853 
854         spin_lock_irqsave(&adapter->hw_lock, flags);
855 
856         use_msg = adapter->use_msg;
857 
858         if (use_msg) {
859                 adapter->use_msg = 0;
860                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
861 
862                 /*
863                  * Now that we know that the ISR won't add more work on the
864                  * workqueue we can safely flush any outstanding work.
865                  */
866                 flush_workqueue(adapter->workqueue);
867                 spin_lock_irqsave(&adapter->hw_lock, flags);
868         }
869 
870         /*
871          * We're going to tear down the entire ring structure and set it back
872          * up, so stalling new requests until all completions are flushed and
873          * the rings are back in place.
874          */
875 
876         pvscsi_process_request_ring(adapter);
877 
878         ll_adapter_reset(adapter);
879 
880         /*
881          * Now process any completions.  Note we do this AFTER adapter reset,
882          * which is strange, but stops races where completions get posted
883          * between processing the ring and issuing the reset.  The backend will
884          * not touch the ring memory after reset, so the immediately pre-reset
885          * completion ring state is still valid.
886          */
887         pvscsi_process_completion_ring(adapter);
888 
889         pvscsi_reset_all(adapter);
890         adapter->use_msg = use_msg;
891         pvscsi_setup_all_rings(adapter);
892         pvscsi_unmask_intr(adapter);
893 
894         spin_unlock_irqrestore(&adapter->hw_lock, flags);
895 
896         return SUCCESS;
897 }
898 
899 static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
900 {
901         struct Scsi_Host *host = cmd->device->host;
902         struct pvscsi_adapter *adapter = shost_priv(host);
903         unsigned long flags;
904 
905         scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
906 
907         /*
908          * We don't want to queue new requests for this bus after
909          * flushing all pending requests to emulation, since new
910          * requests could then sneak in during this bus reset phase,
911          * so take the lock now.
912          */
913         spin_lock_irqsave(&adapter->hw_lock, flags);
914 
915         pvscsi_process_request_ring(adapter);
916         ll_bus_reset(adapter);
917         pvscsi_process_completion_ring(adapter);
918 
919         spin_unlock_irqrestore(&adapter->hw_lock, flags);
920 
921         return SUCCESS;
922 }
923 
924 static int pvscsi_device_reset(struct scsi_cmnd *cmd)
925 {
926         struct Scsi_Host *host = cmd->device->host;
927         struct pvscsi_adapter *adapter = shost_priv(host);
928         unsigned long flags;
929 
930         scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
931                     host->host_no, cmd->device->id);
932 
933         /*
934          * We don't want to queue new requests for this device after flushing
935          * all pending requests to emulation, since new requests could then
936          * sneak in during this device reset phase, so take the lock now.
937          */
938         spin_lock_irqsave(&adapter->hw_lock, flags);
939 
940         pvscsi_process_request_ring(adapter);
941         ll_device_reset(adapter, cmd->device->id);
942         pvscsi_process_completion_ring(adapter);
943 
944         spin_unlock_irqrestore(&adapter->hw_lock, flags);
945 
946         return SUCCESS;
947 }
948 
949 static struct scsi_host_template pvscsi_template;
950 
951 static const char *pvscsi_info(struct Scsi_Host *host)
952 {
953         struct pvscsi_adapter *adapter = shost_priv(host);
954         static char buf[256];
955 
956         sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
957                 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
958                 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
959                 pvscsi_template.cmd_per_lun);
960 
961         return buf;
962 }
963 
964 static struct scsi_host_template pvscsi_template = {
965         .module                         = THIS_MODULE,
966         .name                           = "VMware PVSCSI Host Adapter",
967         .proc_name                      = "vmw_pvscsi",
968         .info                           = pvscsi_info,
969         .queuecommand                   = pvscsi_queue,
970         .this_id                        = -1,
971         .sg_tablesize                   = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
972         .dma_boundary                   = UINT_MAX,
973         .max_sectors                    = 0xffff,
974         .use_clustering                 = ENABLE_CLUSTERING,
975         .change_queue_depth             = pvscsi_change_queue_depth,
976         .eh_abort_handler               = pvscsi_abort,
977         .eh_device_reset_handler        = pvscsi_device_reset,
978         .eh_bus_reset_handler           = pvscsi_bus_reset,
979         .eh_host_reset_handler          = pvscsi_host_reset,
980 };
981 
982 static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
983                                const struct PVSCSIRingMsgDesc *e)
984 {
985         struct PVSCSIRingsState *s = adapter->rings_state;
986         struct Scsi_Host *host = adapter->host;
987         struct scsi_device *sdev;
988 
989         printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
990                e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
991 
992         BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
993 
994         if (e->type == PVSCSI_MSG_DEV_ADDED) {
995                 struct PVSCSIMsgDescDevStatusChanged *desc;
996                 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
997 
998                 printk(KERN_INFO
999                        "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
1000                        desc->bus, desc->target, desc->lun[1]);
1001 
1002                 if (!scsi_host_get(host))
1003                         return;
1004 
1005                 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1006                                           desc->lun[1]);
1007                 if (sdev) {
1008                         printk(KERN_INFO "vmw_pvscsi: device already exists\n");
1009                         scsi_device_put(sdev);
1010                 } else
1011                         scsi_add_device(adapter->host, desc->bus,
1012                                         desc->target, desc->lun[1]);
1013 
1014                 scsi_host_put(host);
1015         } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
1016                 struct PVSCSIMsgDescDevStatusChanged *desc;
1017                 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
1018 
1019                 printk(KERN_INFO
1020                        "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
1021                        desc->bus, desc->target, desc->lun[1]);
1022 
1023                 if (!scsi_host_get(host))
1024                         return;
1025 
1026                 sdev = scsi_device_lookup(host, desc->bus, desc->target,
1027                                           desc->lun[1]);
1028                 if (sdev) {
1029                         scsi_remove_device(sdev);
1030                         scsi_device_put(sdev);
1031                 } else
1032                         printk(KERN_INFO
1033                                "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
1034                                desc->bus, desc->target, desc->lun[1]);
1035 
1036                 scsi_host_put(host);
1037         }
1038 }
1039 
1040 static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
1041 {
1042         struct PVSCSIRingsState *s = adapter->rings_state;
1043 
1044         return s->msgProdIdx != s->msgConsIdx;
1045 }
1046 
1047 static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
1048 {
1049         struct PVSCSIRingsState *s = adapter->rings_state;
1050         struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
1051         u32 msg_entries = s->msgNumEntriesLog2;
1052 
1053         while (pvscsi_msg_pending(adapter)) {
1054                 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
1055                                                       MASK(msg_entries));
1056 
1057                 barrier();
1058                 pvscsi_process_msg(adapter, e);
1059                 barrier();
1060                 s->msgConsIdx++;
1061         }
1062 }
1063 
1064 static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1065 {
1066         struct pvscsi_adapter *adapter;
1067 
1068         adapter = container_of(data, struct pvscsi_adapter, work);
1069 
1070         pvscsi_process_msg_ring(adapter);
1071 }
1072 
1073 static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1074 {
1075         char name[32];
1076 
1077         if (!pvscsi_use_msg)
1078                 return 0;
1079 
1080         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1081                          PVSCSI_CMD_SETUP_MSG_RING);
1082 
1083         if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1084                 return 0;
1085 
1086         snprintf(name, sizeof(name),
1087                  "vmw_pvscsi_wq_%u", adapter->host->host_no);
1088 
1089         adapter->workqueue = create_singlethread_workqueue(name);
1090         if (!adapter->workqueue) {
1091                 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1092                 return 0;
1093         }
1094         INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1095 
1096         return 1;
1097 }
1098 
1099 static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter,
1100                                       bool enable)
1101 {
1102         u32 val;
1103 
1104         if (!pvscsi_use_req_threshold)
1105                 return false;
1106 
1107         pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1108                          PVSCSI_CMD_SETUP_REQCALLTHRESHOLD);
1109         val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS);
1110         if (val == -1) {
1111                 printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n");
1112                 return false;
1113         } else {
1114                 struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 };
1115                 cmd_msg.enable = enable;
1116                 printk(KERN_INFO
1117                        "vmw_pvscsi: %sabling reqCallThreshold\n",
1118                         enable ? "en" : "dis");
1119                 pvscsi_write_cmd_desc(adapter,
1120                                       PVSCSI_CMD_SETUP_REQCALLTHRESHOLD,
1121                                       &cmd_msg, sizeof(cmd_msg));
1122                 return pvscsi_reg_read(adapter,
1123                                        PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0;
1124         }
1125 }
1126 
1127 static irqreturn_t pvscsi_isr(int irq, void *devp)
1128 {
1129         struct pvscsi_adapter *adapter = devp;
1130         int handled;
1131 
1132         if (adapter->use_msi || adapter->use_msix)
1133                 handled = true;
1134         else {
1135                 u32 val = pvscsi_read_intr_status(adapter);
1136                 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1137                 if (handled)
1138                         pvscsi_write_intr_status(devp, val);
1139         }
1140 
1141         if (handled) {
1142                 unsigned long flags;
1143 
1144                 spin_lock_irqsave(&adapter->hw_lock, flags);
1145 
1146                 pvscsi_process_completion_ring(adapter);
1147                 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1148                         queue_work(adapter->workqueue, &adapter->work);
1149 
1150                 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1151         }
1152 
1153         return IRQ_RETVAL(handled);
1154 }
1155 
1156 static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1157 {
1158         struct pvscsi_ctx *ctx = adapter->cmd_map;
1159         unsigned i;
1160 
1161         for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1162                 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1163 }
1164 
1165 static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1166                              unsigned int *irq)
1167 {
1168         struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1169         int ret;
1170 
1171         ret = pci_enable_msix_exact(adapter->dev, &entry, 1);
1172         if (ret)
1173                 return ret;
1174 
1175         *irq = entry.vector;
1176 
1177         return 0;
1178 }
1179 
1180 static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1181 {
1182         if (adapter->irq) {
1183                 free_irq(adapter->irq, adapter);
1184                 adapter->irq = 0;
1185         }
1186         if (adapter->use_msi) {
1187                 pci_disable_msi(adapter->dev);
1188                 adapter->use_msi = 0;
1189         } else if (adapter->use_msix) {
1190                 pci_disable_msix(adapter->dev);
1191                 adapter->use_msix = 0;
1192         }
1193 }
1194 
1195 static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1196 {
1197         pvscsi_shutdown_intr(adapter);
1198 
1199         if (adapter->workqueue)
1200                 destroy_workqueue(adapter->workqueue);
1201 
1202         if (adapter->mmioBase)
1203                 pci_iounmap(adapter->dev, adapter->mmioBase);
1204 
1205         pci_release_regions(adapter->dev);
1206 
1207         if (adapter->cmd_map) {
1208                 pvscsi_free_sgls(adapter);
1209                 kfree(adapter->cmd_map);
1210         }
1211 
1212         if (adapter->rings_state)
1213                 pci_free_consistent(adapter->dev, PAGE_SIZE,
1214                                     adapter->rings_state, adapter->ringStatePA);
1215 
1216         if (adapter->req_ring)
1217                 pci_free_consistent(adapter->dev,
1218                                     adapter->req_pages * PAGE_SIZE,
1219                                     adapter->req_ring, adapter->reqRingPA);
1220 
1221         if (adapter->cmp_ring)
1222                 pci_free_consistent(adapter->dev,
1223                                     adapter->cmp_pages * PAGE_SIZE,
1224                                     adapter->cmp_ring, adapter->cmpRingPA);
1225 
1226         if (adapter->msg_ring)
1227                 pci_free_consistent(adapter->dev,
1228                                     adapter->msg_pages * PAGE_SIZE,
1229                                     adapter->msg_ring, adapter->msgRingPA);
1230 }
1231 
1232 /*
1233  * Allocate scatter gather lists.
1234  *
1235  * These are statically allocated.  Trying to be clever was not worth it.
1236  *
1237  * Dynamic allocation can fail, and we can't go deep into the memory
1238  * allocator, since we're a SCSI driver, and trying too hard to allocate
1239  * memory might generate disk I/O.  We also don't want to fail disk I/O
1240  * in that case because we can't get an allocation - the I/O could be
1241  * trying to swap out data to free memory.  Since that is pathological,
1242  * just use a statically allocated scatter list.
1243  *
1244  */
1245 static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1246 {
1247         struct pvscsi_ctx *ctx;
1248         int i;
1249 
1250         ctx = adapter->cmd_map;
1251         BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1252 
1253         for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1254                 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1255                                                     get_order(SGL_SIZE));
1256                 ctx->sglPA = 0;
1257                 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1258                 if (!ctx->sgl) {
1259                         for (; i >= 0; --i, --ctx) {
1260                                 free_pages((unsigned long)ctx->sgl,
1261                                            get_order(SGL_SIZE));
1262                                 ctx->sgl = NULL;
1263                         }
1264                         return -ENOMEM;
1265                 }
1266         }
1267 
1268         return 0;
1269 }
1270 
1271 /*
1272  * Query the device, fetch the config info and return the
1273  * maximum number of targets on the adapter. In case of
1274  * failure due to any reason return default i.e. 16.
1275  */
1276 static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)
1277 {
1278         struct PVSCSICmdDescConfigCmd cmd;
1279         struct PVSCSIConfigPageHeader *header;
1280         struct device *dev;
1281         dma_addr_t configPagePA;
1282         void *config_page;
1283         u32 numPhys = 16;
1284 
1285         dev = pvscsi_dev(adapter);
1286         config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
1287                                            &configPagePA);
1288         if (!config_page) {
1289                 dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n");
1290                 goto exit;
1291         }
1292         BUG_ON(configPagePA & ~PAGE_MASK);
1293 
1294         /* Fetch config info from the device. */
1295         cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32;
1296         cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;
1297         cmd.cmpAddr = configPagePA;
1298         cmd._pad = 0;
1299 
1300         /*
1301          * Mark the completion page header with error values. If the device
1302          * completes the command successfully, it sets the status values to
1303          * indicate success.
1304          */
1305         header = config_page;
1306         memset(header, 0, sizeof *header);
1307         header->hostStatus = BTSTAT_INVPARAM;
1308         header->scsiStatus = SDSTAT_CHECK;
1309 
1310         pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd);
1311 
1312         if (header->hostStatus == BTSTAT_SUCCESS &&
1313             header->scsiStatus == SDSTAT_GOOD) {
1314                 struct PVSCSIConfigPageController *config;
1315 
1316                 config = config_page;
1317                 numPhys = config->numPhys;
1318         } else
1319                 dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n",
1320                          header->hostStatus, header->scsiStatus);
1321         pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA);
1322 exit:
1323         return numPhys;
1324 }
1325 
1326 static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1327 {
1328         struct pvscsi_adapter *adapter;
1329         struct pvscsi_adapter adapter_temp;
1330         struct Scsi_Host *host = NULL;
1331         unsigned int i;
1332         unsigned long flags = 0;
1333         int error;
1334         u32 max_id;
1335 
1336         error = -ENODEV;
1337 
1338         if (pci_enable_device(pdev))
1339                 return error;
1340 
1341         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1342             pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1343                 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1344         } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1345                    pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1346                 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1347         } else {
1348                 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1349                 goto out_disable_device;
1350         }
1351 
1352         /*
1353          * Let's use a temp pvscsi_adapter struct until we find the number of
1354          * targets on the adapter, after that we will switch to the real
1355          * allocated struct.
1356          */
1357         adapter = &adapter_temp;
1358         memset(adapter, 0, sizeof(*adapter));
1359         adapter->dev  = pdev;
1360         adapter->rev = pdev->revision;
1361 
1362         if (pci_request_regions(pdev, "vmw_pvscsi")) {
1363                 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1364                 goto out_disable_device;
1365         }
1366 
1367         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1368                 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1369                         continue;
1370 
1371                 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1372                         continue;
1373 
1374                 break;
1375         }
1376 
1377         if (i == DEVICE_COUNT_RESOURCE) {
1378                 printk(KERN_ERR
1379                        "vmw_pvscsi: adapter has no suitable MMIO region\n");
1380                 goto out_release_resources_and_disable;
1381         }
1382 
1383         adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1384 
1385         if (!adapter->mmioBase) {
1386                 printk(KERN_ERR
1387                        "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1388                        i, PVSCSI_MEM_SPACE_SIZE);
1389                 goto out_release_resources_and_disable;
1390         }
1391 
1392         pci_set_master(pdev);
1393 
1394         /*
1395          * Ask the device for max number of targets before deciding the
1396          * default pvscsi_ring_pages value.
1397          */
1398         max_id = pvscsi_get_max_targets(adapter);
1399         printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id);
1400 
1401         if (pvscsi_ring_pages == 0)
1402                 /*
1403                  * Set the right default value. Up to 16 it is 8, above it is
1404                  * max.
1405                  */
1406                 pvscsi_ring_pages = (max_id > 16) ?
1407                         PVSCSI_SETUP_RINGS_MAX_NUM_PAGES :
1408                         PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
1409         printk(KERN_INFO
1410                "vmw_pvscsi: setting ring_pages to %d\n",
1411                pvscsi_ring_pages);
1412 
1413         pvscsi_template.can_queue =
1414                 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1415                 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1416         pvscsi_template.cmd_per_lun =
1417                 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1418         host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1419         if (!host) {
1420                 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1421                 goto out_release_resources_and_disable;
1422         }
1423 
1424         /*
1425          * Let's use the real pvscsi_adapter struct here onwards.
1426          */
1427         adapter = shost_priv(host);
1428         memset(adapter, 0, sizeof(*adapter));
1429         adapter->dev  = pdev;
1430         adapter->host = host;
1431         /*
1432          * Copy back what we already have to the allocated adapter struct.
1433          */
1434         adapter->rev = adapter_temp.rev;
1435         adapter->mmioBase = adapter_temp.mmioBase;
1436 
1437         spin_lock_init(&adapter->hw_lock);
1438         host->max_channel = 0;
1439         host->max_lun     = 1;
1440         host->max_cmd_len = 16;
1441         host->max_id      = max_id;
1442 
1443         pci_set_drvdata(pdev, host);
1444 
1445         ll_adapter_reset(adapter);
1446 
1447         adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1448 
1449         error = pvscsi_allocate_rings(adapter);
1450         if (error) {
1451                 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1452                 goto out_release_resources;
1453         }
1454 
1455         /*
1456          * From this point on we should reset the adapter if anything goes
1457          * wrong.
1458          */
1459         pvscsi_setup_all_rings(adapter);
1460 
1461         adapter->cmd_map = kcalloc(adapter->req_depth,
1462                                    sizeof(struct pvscsi_ctx), GFP_KERNEL);
1463         if (!adapter->cmd_map) {
1464                 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1465                 error = -ENOMEM;
1466                 goto out_reset_adapter;
1467         }
1468 
1469         INIT_LIST_HEAD(&adapter->cmd_pool);
1470         for (i = 0; i < adapter->req_depth; i++) {
1471                 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1472                 list_add(&ctx->list, &adapter->cmd_pool);
1473         }
1474 
1475         error = pvscsi_allocate_sg(adapter);
1476         if (error) {
1477                 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1478                 goto out_reset_adapter;
1479         }
1480 
1481         if (!pvscsi_disable_msix &&
1482             pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1483                 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1484                 adapter->use_msix = 1;
1485         } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1486                 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1487                 adapter->use_msi = 1;
1488                 adapter->irq = pdev->irq;
1489         } else {
1490                 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1491                 adapter->irq = pdev->irq;
1492                 flags = IRQF_SHARED;
1493         }
1494 
1495         adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true);
1496         printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n",
1497                adapter->use_req_threshold ? "en" : "dis");
1498 
1499         error = request_irq(adapter->irq, pvscsi_isr, flags,
1500                             "vmw_pvscsi", adapter);
1501         if (error) {
1502                 printk(KERN_ERR
1503                        "vmw_pvscsi: unable to request IRQ: %d\n", error);
1504                 adapter->irq = 0;
1505                 goto out_reset_adapter;
1506         }
1507 
1508         error = scsi_add_host(host, &pdev->dev);
1509         if (error) {
1510                 printk(KERN_ERR
1511                        "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1512                 goto out_reset_adapter;
1513         }
1514 
1515         dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1516                  adapter->rev, host->host_no);
1517 
1518         pvscsi_unmask_intr(adapter);
1519 
1520         scsi_scan_host(host);
1521 
1522         return 0;
1523 
1524 out_reset_adapter:
1525         ll_adapter_reset(adapter);
1526 out_release_resources:
1527         pvscsi_release_resources(adapter);
1528         scsi_host_put(host);
1529 out_disable_device:
1530         pci_disable_device(pdev);
1531 
1532         return error;
1533 
1534 out_release_resources_and_disable:
1535         pvscsi_release_resources(adapter);
1536         goto out_disable_device;
1537 }
1538 
1539 static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1540 {
1541         pvscsi_mask_intr(adapter);
1542 
1543         if (adapter->workqueue)
1544                 flush_workqueue(adapter->workqueue);
1545 
1546         pvscsi_shutdown_intr(adapter);
1547 
1548         pvscsi_process_request_ring(adapter);
1549         pvscsi_process_completion_ring(adapter);
1550         ll_adapter_reset(adapter);
1551 }
1552 
1553 static void pvscsi_shutdown(struct pci_dev *dev)
1554 {
1555         struct Scsi_Host *host = pci_get_drvdata(dev);
1556         struct pvscsi_adapter *adapter = shost_priv(host);
1557 
1558         __pvscsi_shutdown(adapter);
1559 }
1560 
1561 static void pvscsi_remove(struct pci_dev *pdev)
1562 {
1563         struct Scsi_Host *host = pci_get_drvdata(pdev);
1564         struct pvscsi_adapter *adapter = shost_priv(host);
1565 
1566         scsi_remove_host(host);
1567 
1568         __pvscsi_shutdown(adapter);
1569         pvscsi_release_resources(adapter);
1570 
1571         scsi_host_put(host);
1572 
1573         pci_disable_device(pdev);
1574 }
1575 
1576 static struct pci_driver pvscsi_pci_driver = {
1577         .name           = "vmw_pvscsi",
1578         .id_table       = pvscsi_pci_tbl,
1579         .probe          = pvscsi_probe,
1580         .remove         = pvscsi_remove,
1581         .shutdown       = pvscsi_shutdown,
1582 };
1583 
1584 static int __init pvscsi_init(void)
1585 {
1586         pr_info("%s - version %s\n",
1587                 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1588         return pci_register_driver(&pvscsi_pci_driver);
1589 }
1590 
1591 static void __exit pvscsi_exit(void)
1592 {
1593         pci_unregister_driver(&pvscsi_pci_driver);
1594 }
1595 
1596 module_init(pvscsi_init);
1597 module_exit(pvscsi_exit);
1598 

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