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[linux-2.6-block.git] / drivers / scsi / vmw_pvscsi.c
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851b1642
AK		 1/*
2 * Linux driver for VMware's para-virtualized SCSI HBA.
3 *
a2713cce 4 * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved.
851b1642
AK		 5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License and no later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
a9310735 20 * Maintained by: Arvind Kumar <arvindkumar@vmware.com>
851b1642
AK		 21 *
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/interrupt.h>
5a0e3ad6 27#include <linux/slab.h>
851b1642
AK		 28#include <linux/workqueue.h>
29#include <linux/pci.h>
30
31#include <scsi/scsi.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_cmnd.h>
34#include <scsi/scsi_device.h>
02845560 35#include <scsi/scsi_tcq.h>
851b1642
AK		 36
37#include "vmw_pvscsi.h"
38
39#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
40
41MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
42MODULE_AUTHOR("VMware, Inc.");
43MODULE_LICENSE("GPL");
44MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
45
46#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
47#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
02845560 48#define PVSCSI_DEFAULT_QUEUE_DEPTH 254
851b1642
AK		 49#define SGL_SIZE PAGE_SIZE
50
51struct pvscsi_sg_list {
52 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
53};
54
55struct 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;
a2713cce 66 struct completion *abort_cmp;
851b1642
AK		 67};
68
69struct pvscsi_adapter {
70 char *mmioBase;
71 unsigned int irq;
72 u8 rev;
73 bool use_msi;
74 bool use_msix;
75 bool use_msg;
2a815b5a 76 bool use_req_threshold;
851b1642
AK		 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 */
02845560 108static int pvscsi_ring_pages;
851b1642
AK		 109static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
110static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
111static bool pvscsi_disable_msi;
112static bool pvscsi_disable_msix;
113static bool pvscsi_use_msg = true;
2a815b5a 114static bool pvscsi_use_req_threshold = true;
851b1642
AK		 115
116#define PVSCSI_RW (S_IRUSR | S_IWUSR)
117
118module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
119MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
02845560
AK		 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])");
851b1642
AK		 124
125module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
126MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
127 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
128
129module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
130MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
02845560 131 __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")");
851b1642
AK		 132
133module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
134MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
135
136module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
137MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
138
139module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
140MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
141
2a815b5a
RM		 142module_param_named(use_req_threshold, pvscsi_use_req_threshold,
143 bool, PVSCSI_RW);
144MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)");
145
851b1642
AK		 146static const struct pci_device_id pvscsi_pci_tbl[] = {
147 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
148 { 0 }
149};
150
151MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
152
153static struct device *
154pvscsi_dev(const struct pvscsi_adapter *adapter)
155{
156 return &(adapter->dev->dev);
157}
158
159static struct pvscsi_ctx *
160pvscsi_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
172static struct pvscsi_ctx *
173pvscsi_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
187static void pvscsi_release_context(struct pvscsi_adapter *adapter,
188 struct pvscsi_ctx *ctx)
189{
190 ctx->cmd = NULL;
a2713cce 191 ctx->abort_cmp = NULL;
851b1642
AK		 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 */
200static 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
206static struct pvscsi_ctx *
207pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
208{
209 return &adapter->cmd_map[context - 1];
210}
211
212static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
213 u32 offset, u32 val)
214{
215 writel(val, adapter->mmioBase + offset);
216}
217
218static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
219{
220 return readl(adapter->mmioBase + offset);
221}
222
223static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
224{
225 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
226}
227
228static 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
234static 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
245static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
246{
247 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
248}
249
250static 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
263static 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
274static 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
279static 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
284static 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
292static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
293 unsigned char op)
294{
2a815b5a
RM		 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 {
851b1642 302 pvscsi_process_request_ring(adapter);
2a815b5a 303 }
851b1642
AK		 304}
305
306static 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
313static void ll_bus_reset(const struct pvscsi_adapter *adapter)
314{
59e13d48 315 dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter);
851b1642
AK		 316
317 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
318}
319
320static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
321{
322 struct PVSCSICmdDescResetDevice cmd = { 0 };
323
59e13d48 324 dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target);
851b1642
AK		 325
326 cmd.target = target;
327
328 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
329 &cmd, sizeof(cmd));
330}
331
332static 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 */
352static 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
389static 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
6f039790 417static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
851b1642
AK		 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
461static 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
db5ed4df 507static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
02845560 508{
02845560 509 if (!sdev->tagged_supported)
1e6f2416 510 qdepth = 1;
39f79500 511 return scsi_change_queue_depth(sdev, qdepth);
02845560
AK		 512}
513
851b1642
AK		 514/*
515 * Pull a completion descriptor off and pass the completion back
516 * to the SCSI mid layer.
517 */
518static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
519 const struct PVSCSIRingCmpDesc *e)
520{
521 struct pvscsi_ctx *ctx;
522 struct scsi_cmnd *cmd;
a2713cce 523 struct completion *abort_cmp;
851b1642
AK		 524 u32 btstat = e->hostStatus;
525 u32 sdstat = e->scsiStatus;
526
527 ctx = pvscsi_get_context(adapter, e->context);
528 cmd = ctx->cmd;
a2713cce 529 abort_cmp = ctx->abort_cmp;
851b1642
AK		 530 pvscsi_unmap_buffers(adapter, ctx);
531 pvscsi_release_context(adapter, ctx);
a2713cce
AK		 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 }
851b1642 542
a2713cce 543 cmd->result = 0;
851b1642
AK		 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 */
624static 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 */
655static 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;
851b1642
AK		 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
f281233d 725static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
851b1642
AK		 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
f281233d
JG		 754static DEF_SCSI_QCMD(pvscsi_queue)
755
851b1642
AK		 756static 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;
a2713cce
AK		 761 int result = SUCCESS;
762 DECLARE_COMPLETION_ONSTACK(abort_cmp);
851b1642
AK		 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
a2713cce
AK		 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
851b1642 791 pvscsi_abort_cmd(adapter, ctx);
a2713cce
AK		 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);
851b1642 796
a2713cce
AK		 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);
851b1642
AK		 815
816out:
817 spin_unlock_irqrestore(&adapter->hw_lock, flags);
a2713cce 818 return result;
851b1642
AK		 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 */
827static 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
845static 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
899static 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
924static 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
949static struct scsi_host_template pvscsi_template;
950
951static 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
964static 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,
02845560 975 .change_queue_depth = pvscsi_change_queue_depth,
851b1642
AK		 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
982static 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
1040static 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
1047static 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
1064static 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
1073static 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
2a815b5a
RM		 1099static 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
851b1642
AK		 1127static 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
1156static 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
d0e2ddff
DT		 1165static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
1166 unsigned int *irq)
851b1642
AK		 1167{
1168 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1169 int ret;
1170
db1924d0 1171 ret = pci_enable_msix_exact(adapter->dev, &entry, 1);
851b1642
AK		 1172 if (ret)
1173 return ret;
1174
1175 *irq = entry.vector;
1176
1177 return 0;
1178}
1179
1180static 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
1195static 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 *
42b2aa86 1237 * Dynamic allocation can fail, and we can't go deep into the memory
851b1642
AK		 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 */
6f039790 1245static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
851b1642
AK		 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
a9310735
AK		 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 */
1276static 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);
1322exit:
1323 return numPhys;
1324}
1325
6f039790 1326static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
851b1642
AK		 1327{
1328 struct pvscsi_adapter *adapter;
02845560
AK		 1329 struct pvscsi_adapter adapter_temp;
1330 struct Scsi_Host *host = NULL;
851b1642
AK		 1331 unsigned int i;
1332 unsigned long flags = 0;
1333 int error;
02845560 1334 u32 max_id;
851b1642
AK		 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
02845560
AK		 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;
851b1642
AK		 1358 memset(adapter, 0, sizeof(*adapter));
1359 adapter->dev = pdev;
851b1642
AK		 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");
02845560 1364 goto out_disable_device;
851b1642
AK		 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");
02845560 1380 goto out_release_resources_and_disable;
851b1642
AK		 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);
02845560 1389 goto out_release_resources_and_disable;
851b1642
AK		 1390 }
1391
1392 pci_set_master(pdev);
02845560
AK		 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
851b1642
AK		 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
2a815b5a
RM		 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
851b1642
AK		 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
1524out_reset_adapter:
1525 ll_adapter_reset(adapter);
1526out_release_resources:
1527 pvscsi_release_resources(adapter);
851b1642
AK		 1528 scsi_host_put(host);
1529out_disable_device:
851b1642
AK		 1530 pci_disable_device(pdev);
1531
1532 return error;
02845560
AK		 1533
1534out_release_resources_and_disable:
1535 pvscsi_release_resources(adapter);
1536 goto out_disable_device;
851b1642
AK		 1537}
1538
1539static 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
1553static 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
1561static 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
851b1642
AK		 1573 pci_disable_device(pdev);
1574}
1575
1576static struct pci_driver pvscsi_pci_driver = {
1577 .name = "vmw_pvscsi",
1578 .id_table = pvscsi_pci_tbl,
1579 .probe = pvscsi_probe,
6f039790 1580 .remove = pvscsi_remove,
851b1642
AK		 1581 .shutdown = pvscsi_shutdown,
1582};
1583
1584static 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
1591static void __exit pvscsi_exit(void)
1592{
1593 pci_unregister_driver(&pvscsi_pci_driver);
1594}
1595
1596module_init(pvscsi_init);
1597module_exit(pvscsi_exit);
Linux 6.x block layer and io_uring tree(s)