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1 | /* |
2 | * Linux driver for VMware's para-virtualized SCSI HBA. |
3 | * |
4 | * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License as published by the |
8 | * Free Software Foundation; version 2 of the License and no later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
13 | * NON INFRINGEMENT. See the GNU General Public License for more |
14 | * details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
19 | * |
20 | * Maintained by: 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 | |
36 | #include "vmw_pvscsi.h" |
37 | |
38 | #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" |
39 | |
40 | MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); |
41 | MODULE_AUTHOR("VMware, Inc."); |
42 | MODULE_LICENSE("GPL"); |
43 | MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); |
44 | |
45 | #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 |
46 | #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 |
47 | #define PVSCSI_DEFAULT_QUEUE_DEPTH 64 |
48 | #define SGL_SIZE PAGE_SIZE |
49 | |
50 | struct pvscsi_sg_list { |
51 | struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; |
52 | }; |
53 | |
54 | struct pvscsi_ctx { |
55 | /* |
56 | * The index of the context in cmd_map serves as the context ID for a |
57 | * 1-to-1 mapping completions back to requests. |
58 | */ |
59 | struct scsi_cmnd *cmd; |
60 | struct pvscsi_sg_list *sgl; |
61 | struct list_head list; |
62 | dma_addr_t dataPA; |
63 | dma_addr_t sensePA; |
64 | dma_addr_t sglPA; |
65 | }; |
66 | |
67 | struct pvscsi_adapter { |
68 | char *mmioBase; |
69 | unsigned int irq; |
70 | u8 rev; |
71 | bool use_msi; |
72 | bool use_msix; |
73 | bool use_msg; |
74 | |
75 | spinlock_t hw_lock; |
76 | |
77 | struct workqueue_struct *workqueue; |
78 | struct work_struct work; |
79 | |
80 | struct PVSCSIRingReqDesc *req_ring; |
81 | unsigned req_pages; |
82 | unsigned req_depth; |
83 | dma_addr_t reqRingPA; |
84 | |
85 | struct PVSCSIRingCmpDesc *cmp_ring; |
86 | unsigned cmp_pages; |
87 | dma_addr_t cmpRingPA; |
88 | |
89 | struct PVSCSIRingMsgDesc *msg_ring; |
90 | unsigned msg_pages; |
91 | dma_addr_t msgRingPA; |
92 | |
93 | struct PVSCSIRingsState *rings_state; |
94 | dma_addr_t ringStatePA; |
95 | |
96 | struct pci_dev *dev; |
97 | struct Scsi_Host *host; |
98 | |
99 | struct list_head cmd_pool; |
100 | struct pvscsi_ctx *cmd_map; |
101 | }; |
102 | |
103 | |
104 | /* Command line parameters */ |
105 | static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING; |
106 | static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; |
107 | static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; |
108 | static bool pvscsi_disable_msi; |
109 | static bool pvscsi_disable_msix; |
110 | static bool pvscsi_use_msg = true; |
111 | |
112 | #define PVSCSI_RW (S_IRUSR | S_IWUSR) |
113 | |
114 | module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); |
115 | MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" |
116 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")"); |
117 | |
118 | module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); |
119 | MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" |
120 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); |
121 | |
122 | module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); |
123 | MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" |
124 | __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")"); |
125 | |
126 | module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); |
127 | MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); |
128 | |
129 | module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); |
130 | MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); |
131 | |
132 | module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); |
133 | MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); |
134 | |
135 | static const struct pci_device_id pvscsi_pci_tbl[] = { |
136 | { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, |
137 | { 0 } |
138 | }; |
139 | |
140 | MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); |
141 | |
142 | static struct device * |
143 | pvscsi_dev(const struct pvscsi_adapter *adapter) |
144 | { |
145 | return &(adapter->dev->dev); |
146 | } |
147 | |
148 | static struct pvscsi_ctx * |
149 | pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) |
150 | { |
151 | struct pvscsi_ctx *ctx, *end; |
152 | |
153 | end = &adapter->cmd_map[adapter->req_depth]; |
154 | for (ctx = adapter->cmd_map; ctx < end; ctx++) |
155 | if (ctx->cmd == cmd) |
156 | return ctx; |
157 | |
158 | return NULL; |
159 | } |
160 | |
161 | static struct pvscsi_ctx * |
162 | pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) |
163 | { |
164 | struct pvscsi_ctx *ctx; |
165 | |
166 | if (list_empty(&adapter->cmd_pool)) |
167 | return NULL; |
168 | |
169 | ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); |
170 | ctx->cmd = cmd; |
171 | list_del(&ctx->list); |
172 | |
173 | return ctx; |
174 | } |
175 | |
176 | static void pvscsi_release_context(struct pvscsi_adapter *adapter, |
177 | struct pvscsi_ctx *ctx) |
178 | { |
179 | ctx->cmd = NULL; |
180 | list_add(&ctx->list, &adapter->cmd_pool); |
181 | } |
182 | |
183 | /* |
184 | * Map a pvscsi_ctx struct to a context ID field value; we map to a simple |
185 | * non-zero integer. ctx always points to an entry in cmd_map array, hence |
186 | * the return value is always >=1. |
187 | */ |
188 | static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, |
189 | const struct pvscsi_ctx *ctx) |
190 | { |
191 | return ctx - adapter->cmd_map + 1; |
192 | } |
193 | |
194 | static struct pvscsi_ctx * |
195 | pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) |
196 | { |
197 | return &adapter->cmd_map[context - 1]; |
198 | } |
199 | |
200 | static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, |
201 | u32 offset, u32 val) |
202 | { |
203 | writel(val, adapter->mmioBase + offset); |
204 | } |
205 | |
206 | static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) |
207 | { |
208 | return readl(adapter->mmioBase + offset); |
209 | } |
210 | |
211 | static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) |
212 | { |
213 | return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); |
214 | } |
215 | |
216 | static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, |
217 | u32 val) |
218 | { |
219 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); |
220 | } |
221 | |
222 | static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) |
223 | { |
224 | u32 intr_bits; |
225 | |
226 | intr_bits = PVSCSI_INTR_CMPL_MASK; |
227 | if (adapter->use_msg) |
228 | intr_bits |= PVSCSI_INTR_MSG_MASK; |
229 | |
230 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); |
231 | } |
232 | |
233 | static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) |
234 | { |
235 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); |
236 | } |
237 | |
238 | static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, |
239 | u32 cmd, const void *desc, size_t len) |
240 | { |
241 | const u32 *ptr = desc; |
242 | size_t i; |
243 | |
244 | len /= sizeof(*ptr); |
245 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); |
246 | for (i = 0; i < len; i++) |
247 | pvscsi_reg_write(adapter, |
248 | PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); |
249 | } |
250 | |
251 | static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, |
252 | const struct pvscsi_ctx *ctx) |
253 | { |
254 | struct PVSCSICmdDescAbortCmd cmd = { 0 }; |
255 | |
256 | cmd.target = ctx->cmd->device->id; |
257 | cmd.context = pvscsi_map_context(adapter, ctx); |
258 | |
259 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); |
260 | } |
261 | |
262 | static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) |
263 | { |
264 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); |
265 | } |
266 | |
267 | static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) |
268 | { |
269 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); |
270 | } |
271 | |
272 | static int scsi_is_rw(unsigned char op) |
273 | { |
274 | return op == READ_6 || op == WRITE_6 || |
275 | op == READ_10 || op == WRITE_10 || |
276 | op == READ_12 || op == WRITE_12 || |
277 | op == READ_16 || op == WRITE_16; |
278 | } |
279 | |
280 | static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, |
281 | unsigned char op) |
282 | { |
283 | if (scsi_is_rw(op)) |
284 | pvscsi_kick_rw_io(adapter); |
285 | else |
286 | pvscsi_process_request_ring(adapter); |
287 | } |
288 | |
289 | static void ll_adapter_reset(const struct pvscsi_adapter *adapter) |
290 | { |
291 | dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); |
292 | |
293 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); |
294 | } |
295 | |
296 | static void ll_bus_reset(const struct pvscsi_adapter *adapter) |
297 | { |
298 | dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter); |
299 | |
300 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); |
301 | } |
302 | |
303 | static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) |
304 | { |
305 | struct PVSCSICmdDescResetDevice cmd = { 0 }; |
306 | |
307 | dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target); |
308 | |
309 | cmd.target = target; |
310 | |
311 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, |
312 | &cmd, sizeof(cmd)); |
313 | } |
314 | |
315 | static void pvscsi_create_sg(struct pvscsi_ctx *ctx, |
316 | struct scatterlist *sg, unsigned count) |
317 | { |
318 | unsigned i; |
319 | struct PVSCSISGElement *sge; |
320 | |
321 | BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); |
322 | |
323 | sge = &ctx->sgl->sge[0]; |
324 | for (i = 0; i < count; i++, sg++) { |
325 | sge[i].addr = sg_dma_address(sg); |
326 | sge[i].length = sg_dma_len(sg); |
327 | sge[i].flags = 0; |
328 | } |
329 | } |
330 | |
331 | /* |
332 | * Map all data buffers for a command into PCI space and |
333 | * setup the scatter/gather list if needed. |
334 | */ |
335 | static void pvscsi_map_buffers(struct pvscsi_adapter *adapter, |
336 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, |
337 | struct PVSCSIRingReqDesc *e) |
338 | { |
339 | unsigned count; |
340 | unsigned bufflen = scsi_bufflen(cmd); |
341 | struct scatterlist *sg; |
342 | |
343 | e->dataLen = bufflen; |
344 | e->dataAddr = 0; |
345 | if (bufflen == 0) |
346 | return; |
347 | |
348 | sg = scsi_sglist(cmd); |
349 | count = scsi_sg_count(cmd); |
350 | if (count != 0) { |
351 | int segs = scsi_dma_map(cmd); |
352 | if (segs > 1) { |
353 | pvscsi_create_sg(ctx, sg, segs); |
354 | |
355 | e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; |
356 | ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl, |
357 | SGL_SIZE, PCI_DMA_TODEVICE); |
358 | e->dataAddr = ctx->sglPA; |
359 | } else |
360 | e->dataAddr = sg_dma_address(sg); |
361 | } else { |
362 | /* |
363 | * In case there is no S/G list, scsi_sglist points |
364 | * directly to the buffer. |
365 | */ |
366 | ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen, |
367 | cmd->sc_data_direction); |
368 | e->dataAddr = ctx->dataPA; |
369 | } |
370 | } |
371 | |
372 | static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, |
373 | struct pvscsi_ctx *ctx) |
374 | { |
375 | struct scsi_cmnd *cmd; |
376 | unsigned bufflen; |
377 | |
378 | cmd = ctx->cmd; |
379 | bufflen = scsi_bufflen(cmd); |
380 | |
381 | if (bufflen != 0) { |
382 | unsigned count = scsi_sg_count(cmd); |
383 | |
384 | if (count != 0) { |
385 | scsi_dma_unmap(cmd); |
386 | if (ctx->sglPA) { |
387 | pci_unmap_single(adapter->dev, ctx->sglPA, |
388 | SGL_SIZE, PCI_DMA_TODEVICE); |
389 | ctx->sglPA = 0; |
390 | } |
391 | } else |
392 | pci_unmap_single(adapter->dev, ctx->dataPA, bufflen, |
393 | cmd->sc_data_direction); |
394 | } |
395 | if (cmd->sense_buffer) |
396 | pci_unmap_single(adapter->dev, ctx->sensePA, |
397 | SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); |
398 | } |
399 | |
400 | static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) |
401 | { |
402 | adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE, |
403 | &adapter->ringStatePA); |
404 | if (!adapter->rings_state) |
405 | return -ENOMEM; |
406 | |
407 | adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, |
408 | pvscsi_ring_pages); |
409 | adapter->req_depth = adapter->req_pages |
410 | * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; |
411 | adapter->req_ring = pci_alloc_consistent(adapter->dev, |
412 | adapter->req_pages * PAGE_SIZE, |
413 | &adapter->reqRingPA); |
414 | if (!adapter->req_ring) |
415 | return -ENOMEM; |
416 | |
417 | adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, |
418 | pvscsi_ring_pages); |
419 | adapter->cmp_ring = pci_alloc_consistent(adapter->dev, |
420 | adapter->cmp_pages * PAGE_SIZE, |
421 | &adapter->cmpRingPA); |
422 | if (!adapter->cmp_ring) |
423 | return -ENOMEM; |
424 | |
425 | BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); |
426 | BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); |
427 | BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); |
428 | |
429 | if (!adapter->use_msg) |
430 | return 0; |
431 | |
432 | adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, |
433 | pvscsi_msg_ring_pages); |
434 | adapter->msg_ring = pci_alloc_consistent(adapter->dev, |
435 | adapter->msg_pages * PAGE_SIZE, |
436 | &adapter->msgRingPA); |
437 | if (!adapter->msg_ring) |
438 | return -ENOMEM; |
439 | BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); |
440 | |
441 | return 0; |
442 | } |
443 | |
444 | static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) |
445 | { |
446 | struct PVSCSICmdDescSetupRings cmd = { 0 }; |
447 | dma_addr_t base; |
448 | unsigned i; |
449 | |
450 | cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; |
451 | cmd.reqRingNumPages = adapter->req_pages; |
452 | cmd.cmpRingNumPages = adapter->cmp_pages; |
453 | |
454 | base = adapter->reqRingPA; |
455 | for (i = 0; i < adapter->req_pages; i++) { |
456 | cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; |
457 | base += PAGE_SIZE; |
458 | } |
459 | |
460 | base = adapter->cmpRingPA; |
461 | for (i = 0; i < adapter->cmp_pages; i++) { |
462 | cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; |
463 | base += PAGE_SIZE; |
464 | } |
465 | |
466 | memset(adapter->rings_state, 0, PAGE_SIZE); |
467 | memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); |
468 | memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); |
469 | |
470 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, |
471 | &cmd, sizeof(cmd)); |
472 | |
473 | if (adapter->use_msg) { |
474 | struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; |
475 | |
476 | cmd_msg.numPages = adapter->msg_pages; |
477 | |
478 | base = adapter->msgRingPA; |
479 | for (i = 0; i < adapter->msg_pages; i++) { |
480 | cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; |
481 | base += PAGE_SIZE; |
482 | } |
483 | memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); |
484 | |
485 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, |
486 | &cmd_msg, sizeof(cmd_msg)); |
487 | } |
488 | } |
489 | |
490 | /* |
491 | * Pull a completion descriptor off and pass the completion back |
492 | * to the SCSI mid layer. |
493 | */ |
494 | static void pvscsi_complete_request(struct pvscsi_adapter *adapter, |
495 | const struct PVSCSIRingCmpDesc *e) |
496 | { |
497 | struct pvscsi_ctx *ctx; |
498 | struct scsi_cmnd *cmd; |
499 | u32 btstat = e->hostStatus; |
500 | u32 sdstat = e->scsiStatus; |
501 | |
502 | ctx = pvscsi_get_context(adapter, e->context); |
503 | cmd = ctx->cmd; |
504 | pvscsi_unmap_buffers(adapter, ctx); |
505 | pvscsi_release_context(adapter, ctx); |
506 | cmd->result = 0; |
507 | |
508 | if (sdstat != SAM_STAT_GOOD && |
509 | (btstat == BTSTAT_SUCCESS || |
510 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED || |
511 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { |
512 | cmd->result = (DID_OK << 16) | sdstat; |
513 | if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer) |
514 | cmd->result |= (DRIVER_SENSE << 24); |
515 | } else |
516 | switch (btstat) { |
517 | case BTSTAT_SUCCESS: |
518 | case BTSTAT_LINKED_COMMAND_COMPLETED: |
519 | case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: |
520 | /* If everything went fine, let's move on.. */ |
521 | cmd->result = (DID_OK << 16); |
522 | break; |
523 | |
524 | case BTSTAT_DATARUN: |
525 | case BTSTAT_DATA_UNDERRUN: |
526 | /* Report residual data in underruns */ |
527 | scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); |
528 | cmd->result = (DID_ERROR << 16); |
529 | break; |
530 | |
531 | case BTSTAT_SELTIMEO: |
532 | /* Our emulation returns this for non-connected devs */ |
533 | cmd->result = (DID_BAD_TARGET << 16); |
534 | break; |
535 | |
536 | case BTSTAT_LUNMISMATCH: |
537 | case BTSTAT_TAGREJECT: |
538 | case BTSTAT_BADMSG: |
539 | cmd->result = (DRIVER_INVALID << 24); |
540 | /* fall through */ |
541 | |
542 | case BTSTAT_HAHARDWARE: |
543 | case BTSTAT_INVPHASE: |
544 | case BTSTAT_HATIMEOUT: |
545 | case BTSTAT_NORESPONSE: |
546 | case BTSTAT_DISCONNECT: |
547 | case BTSTAT_HASOFTWARE: |
548 | case BTSTAT_BUSFREE: |
549 | case BTSTAT_SENSFAILED: |
550 | cmd->result |= (DID_ERROR << 16); |
551 | break; |
552 | |
553 | case BTSTAT_SENTRST: |
554 | case BTSTAT_RECVRST: |
555 | case BTSTAT_BUSRESET: |
556 | cmd->result = (DID_RESET << 16); |
557 | break; |
558 | |
559 | case BTSTAT_ABORTQUEUE: |
560 | cmd->result = (DID_ABORT << 16); |
561 | break; |
562 | |
563 | case BTSTAT_SCSIPARITY: |
564 | cmd->result = (DID_PARITY << 16); |
565 | break; |
566 | |
567 | default: |
568 | cmd->result = (DID_ERROR << 16); |
569 | scmd_printk(KERN_DEBUG, cmd, |
570 | "Unknown completion status: 0x%x\n", |
571 | btstat); |
572 | } |
573 | |
574 | dev_dbg(&cmd->device->sdev_gendev, |
575 | "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", |
576 | cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); |
577 | |
578 | cmd->scsi_done(cmd); |
579 | } |
580 | |
581 | /* |
582 | * barrier usage : Since the PVSCSI device is emulated, there could be cases |
583 | * where we may want to serialize some accesses between the driver and the |
584 | * emulation layer. We use compiler barriers instead of the more expensive |
585 | * memory barriers because PVSCSI is only supported on X86 which has strong |
586 | * memory access ordering. |
587 | */ |
588 | static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) |
589 | { |
590 | struct PVSCSIRingsState *s = adapter->rings_state; |
591 | struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; |
592 | u32 cmp_entries = s->cmpNumEntriesLog2; |
593 | |
594 | while (s->cmpConsIdx != s->cmpProdIdx) { |
595 | struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & |
596 | MASK(cmp_entries)); |
597 | /* |
598 | * This barrier() ensures that *e is not dereferenced while |
599 | * the device emulation still writes data into the slot. |
600 | * Since the device emulation advances s->cmpProdIdx only after |
601 | * updating the slot we want to check it first. |
602 | */ |
603 | barrier(); |
604 | pvscsi_complete_request(adapter, e); |
605 | /* |
606 | * This barrier() ensures that compiler doesn't reorder write |
607 | * to s->cmpConsIdx before the read of (*e) inside |
608 | * pvscsi_complete_request. Otherwise, device emulation may |
609 | * overwrite *e before we had a chance to read it. |
610 | */ |
611 | barrier(); |
612 | s->cmpConsIdx++; |
613 | } |
614 | } |
615 | |
616 | /* |
617 | * Translate a Linux SCSI request into a request ring entry. |
618 | */ |
619 | static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, |
620 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) |
621 | { |
622 | struct PVSCSIRingsState *s; |
623 | struct PVSCSIRingReqDesc *e; |
624 | struct scsi_device *sdev; |
625 | u32 req_entries; |
626 | |
627 | s = adapter->rings_state; |
628 | sdev = cmd->device; |
629 | req_entries = s->reqNumEntriesLog2; |
630 | |
631 | /* |
632 | * If this condition holds, we might have room on the request ring, but |
633 | * we might not have room on the completion ring for the response. |
634 | * However, we have already ruled out this possibility - we would not |
635 | * have successfully allocated a context if it were true, since we only |
636 | * have one context per request entry. Check for it anyway, since it |
637 | * would be a serious bug. |
638 | */ |
639 | if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { |
640 | scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " |
641 | "ring full: reqProdIdx=%d cmpConsIdx=%d\n", |
642 | s->reqProdIdx, s->cmpConsIdx); |
643 | return -1; |
644 | } |
645 | |
646 | e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); |
647 | |
648 | e->bus = sdev->channel; |
649 | e->target = sdev->id; |
650 | memset(e->lun, 0, sizeof(e->lun)); |
651 | e->lun[1] = sdev->lun; |
652 | |
653 | if (cmd->sense_buffer) { |
654 | ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer, |
655 | SCSI_SENSE_BUFFERSIZE, |
656 | PCI_DMA_FROMDEVICE); |
657 | e->senseAddr = ctx->sensePA; |
658 | e->senseLen = SCSI_SENSE_BUFFERSIZE; |
659 | } else { |
660 | e->senseLen = 0; |
661 | e->senseAddr = 0; |
662 | } |
663 | e->cdbLen = cmd->cmd_len; |
664 | e->vcpuHint = smp_processor_id(); |
665 | memcpy(e->cdb, cmd->cmnd, e->cdbLen); |
666 | |
667 | e->tag = SIMPLE_QUEUE_TAG; |
668 | if (sdev->tagged_supported && |
669 | (cmd->tag == HEAD_OF_QUEUE_TAG || |
670 | cmd->tag == ORDERED_QUEUE_TAG)) |
671 | e->tag = cmd->tag; |
672 | |
673 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) |
674 | e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; |
675 | else if (cmd->sc_data_direction == DMA_TO_DEVICE) |
676 | e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; |
677 | else if (cmd->sc_data_direction == DMA_NONE) |
678 | e->flags = PVSCSI_FLAG_CMD_DIR_NONE; |
679 | else |
680 | e->flags = 0; |
681 | |
682 | pvscsi_map_buffers(adapter, ctx, cmd, e); |
683 | |
684 | e->context = pvscsi_map_context(adapter, ctx); |
685 | |
686 | barrier(); |
687 | |
688 | s->reqProdIdx++; |
689 | |
690 | return 0; |
691 | } |
692 | |
693 | static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) |
694 | { |
695 | struct Scsi_Host *host = cmd->device->host; |
696 | struct pvscsi_adapter *adapter = shost_priv(host); |
697 | struct pvscsi_ctx *ctx; |
698 | unsigned long flags; |
699 | |
700 | spin_lock_irqsave(&adapter->hw_lock, flags); |
701 | |
702 | ctx = pvscsi_acquire_context(adapter, cmd); |
703 | if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { |
704 | if (ctx) |
705 | pvscsi_release_context(adapter, ctx); |
706 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
707 | return SCSI_MLQUEUE_HOST_BUSY; |
708 | } |
709 | |
710 | cmd->scsi_done = done; |
711 | |
712 | dev_dbg(&cmd->device->sdev_gendev, |
713 | "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]); |
714 | |
715 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
716 | |
717 | pvscsi_kick_io(adapter, cmd->cmnd[0]); |
718 | |
719 | return 0; |
720 | } |
721 | |
722 | static DEF_SCSI_QCMD(pvscsi_queue) |
723 | |
724 | static int pvscsi_abort(struct scsi_cmnd *cmd) |
725 | { |
726 | struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); |
727 | struct pvscsi_ctx *ctx; |
728 | unsigned long flags; |
729 | |
730 | scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", |
731 | adapter->host->host_no, cmd); |
732 | |
733 | spin_lock_irqsave(&adapter->hw_lock, flags); |
734 | |
735 | /* |
736 | * Poll the completion ring first - we might be trying to abort |
737 | * a command that is waiting to be dispatched in the completion ring. |
738 | */ |
739 | pvscsi_process_completion_ring(adapter); |
740 | |
741 | /* |
742 | * If there is no context for the command, it either already succeeded |
743 | * or else was never properly issued. Not our problem. |
744 | */ |
745 | ctx = pvscsi_find_context(adapter, cmd); |
746 | if (!ctx) { |
747 | scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); |
748 | goto out; |
749 | } |
750 | |
751 | pvscsi_abort_cmd(adapter, ctx); |
752 | |
753 | pvscsi_process_completion_ring(adapter); |
754 | |
755 | out: |
756 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
757 | return SUCCESS; |
758 | } |
759 | |
760 | /* |
761 | * Abort all outstanding requests. This is only safe to use if the completion |
762 | * ring will never be walked again or the device has been reset, because it |
763 | * destroys the 1-1 mapping between context field passed to emulation and our |
764 | * request structure. |
765 | */ |
766 | static void pvscsi_reset_all(struct pvscsi_adapter *adapter) |
767 | { |
768 | unsigned i; |
769 | |
770 | for (i = 0; i < adapter->req_depth; i++) { |
771 | struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; |
772 | struct scsi_cmnd *cmd = ctx->cmd; |
773 | if (cmd) { |
774 | scmd_printk(KERN_ERR, cmd, |
775 | "Forced reset on cmd %p\n", cmd); |
776 | pvscsi_unmap_buffers(adapter, ctx); |
777 | pvscsi_release_context(adapter, ctx); |
778 | cmd->result = (DID_RESET << 16); |
779 | cmd->scsi_done(cmd); |
780 | } |
781 | } |
782 | } |
783 | |
784 | static int pvscsi_host_reset(struct scsi_cmnd *cmd) |
785 | { |
786 | struct Scsi_Host *host = cmd->device->host; |
787 | struct pvscsi_adapter *adapter = shost_priv(host); |
788 | unsigned long flags; |
789 | bool use_msg; |
790 | |
791 | scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); |
792 | |
793 | spin_lock_irqsave(&adapter->hw_lock, flags); |
794 | |
795 | use_msg = adapter->use_msg; |
796 | |
797 | if (use_msg) { |
798 | adapter->use_msg = 0; |
799 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
800 | |
801 | /* |
802 | * Now that we know that the ISR won't add more work on the |
803 | * workqueue we can safely flush any outstanding work. |
804 | */ |
805 | flush_workqueue(adapter->workqueue); |
806 | spin_lock_irqsave(&adapter->hw_lock, flags); |
807 | } |
808 | |
809 | /* |
810 | * We're going to tear down the entire ring structure and set it back |
811 | * up, so stalling new requests until all completions are flushed and |
812 | * the rings are back in place. |
813 | */ |
814 | |
815 | pvscsi_process_request_ring(adapter); |
816 | |
817 | ll_adapter_reset(adapter); |
818 | |
819 | /* |
820 | * Now process any completions. Note we do this AFTER adapter reset, |
821 | * which is strange, but stops races where completions get posted |
822 | * between processing the ring and issuing the reset. The backend will |
823 | * not touch the ring memory after reset, so the immediately pre-reset |
824 | * completion ring state is still valid. |
825 | */ |
826 | pvscsi_process_completion_ring(adapter); |
827 | |
828 | pvscsi_reset_all(adapter); |
829 | adapter->use_msg = use_msg; |
830 | pvscsi_setup_all_rings(adapter); |
831 | pvscsi_unmask_intr(adapter); |
832 | |
833 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
834 | |
835 | return SUCCESS; |
836 | } |
837 | |
838 | static int pvscsi_bus_reset(struct scsi_cmnd *cmd) |
839 | { |
840 | struct Scsi_Host *host = cmd->device->host; |
841 | struct pvscsi_adapter *adapter = shost_priv(host); |
842 | unsigned long flags; |
843 | |
844 | scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); |
845 | |
846 | /* |
847 | * We don't want to queue new requests for this bus after |
848 | * flushing all pending requests to emulation, since new |
849 | * requests could then sneak in during this bus reset phase, |
850 | * so take the lock now. |
851 | */ |
852 | spin_lock_irqsave(&adapter->hw_lock, flags); |
853 | |
854 | pvscsi_process_request_ring(adapter); |
855 | ll_bus_reset(adapter); |
856 | pvscsi_process_completion_ring(adapter); |
857 | |
858 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
859 | |
860 | return SUCCESS; |
861 | } |
862 | |
863 | static int pvscsi_device_reset(struct scsi_cmnd *cmd) |
864 | { |
865 | struct Scsi_Host *host = cmd->device->host; |
866 | struct pvscsi_adapter *adapter = shost_priv(host); |
867 | unsigned long flags; |
868 | |
869 | scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", |
870 | host->host_no, cmd->device->id); |
871 | |
872 | /* |
873 | * We don't want to queue new requests for this device after flushing |
874 | * all pending requests to emulation, since new requests could then |
875 | * sneak in during this device reset phase, so take the lock now. |
876 | */ |
877 | spin_lock_irqsave(&adapter->hw_lock, flags); |
878 | |
879 | pvscsi_process_request_ring(adapter); |
880 | ll_device_reset(adapter, cmd->device->id); |
881 | pvscsi_process_completion_ring(adapter); |
882 | |
883 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
884 | |
885 | return SUCCESS; |
886 | } |
887 | |
888 | static struct scsi_host_template pvscsi_template; |
889 | |
890 | static const char *pvscsi_info(struct Scsi_Host *host) |
891 | { |
892 | struct pvscsi_adapter *adapter = shost_priv(host); |
893 | static char buf[256]; |
894 | |
895 | sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " |
896 | "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, |
897 | adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, |
898 | pvscsi_template.cmd_per_lun); |
899 | |
900 | return buf; |
901 | } |
902 | |
903 | static struct scsi_host_template pvscsi_template = { |
904 | .module = THIS_MODULE, |
905 | .name = "VMware PVSCSI Host Adapter", |
906 | .proc_name = "vmw_pvscsi", |
907 | .info = pvscsi_info, |
908 | .queuecommand = pvscsi_queue, |
909 | .this_id = -1, |
910 | .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, |
911 | .dma_boundary = UINT_MAX, |
912 | .max_sectors = 0xffff, |
913 | .use_clustering = ENABLE_CLUSTERING, |
914 | .eh_abort_handler = pvscsi_abort, |
915 | .eh_device_reset_handler = pvscsi_device_reset, |
916 | .eh_bus_reset_handler = pvscsi_bus_reset, |
917 | .eh_host_reset_handler = pvscsi_host_reset, |
918 | }; |
919 | |
920 | static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, |
921 | const struct PVSCSIRingMsgDesc *e) |
922 | { |
923 | struct PVSCSIRingsState *s = adapter->rings_state; |
924 | struct Scsi_Host *host = adapter->host; |
925 | struct scsi_device *sdev; |
926 | |
927 | printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", |
928 | e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); |
929 | |
930 | BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); |
931 | |
932 | if (e->type == PVSCSI_MSG_DEV_ADDED) { |
933 | struct PVSCSIMsgDescDevStatusChanged *desc; |
934 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; |
935 | |
936 | printk(KERN_INFO |
937 | "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", |
938 | desc->bus, desc->target, desc->lun[1]); |
939 | |
940 | if (!scsi_host_get(host)) |
941 | return; |
942 | |
943 | sdev = scsi_device_lookup(host, desc->bus, desc->target, |
944 | desc->lun[1]); |
945 | if (sdev) { |
946 | printk(KERN_INFO "vmw_pvscsi: device already exists\n"); |
947 | scsi_device_put(sdev); |
948 | } else |
949 | scsi_add_device(adapter->host, desc->bus, |
950 | desc->target, desc->lun[1]); |
951 | |
952 | scsi_host_put(host); |
953 | } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { |
954 | struct PVSCSIMsgDescDevStatusChanged *desc; |
955 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; |
956 | |
957 | printk(KERN_INFO |
958 | "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", |
959 | desc->bus, desc->target, desc->lun[1]); |
960 | |
961 | if (!scsi_host_get(host)) |
962 | return; |
963 | |
964 | sdev = scsi_device_lookup(host, desc->bus, desc->target, |
965 | desc->lun[1]); |
966 | if (sdev) { |
967 | scsi_remove_device(sdev); |
968 | scsi_device_put(sdev); |
969 | } else |
970 | printk(KERN_INFO |
971 | "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", |
972 | desc->bus, desc->target, desc->lun[1]); |
973 | |
974 | scsi_host_put(host); |
975 | } |
976 | } |
977 | |
978 | static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) |
979 | { |
980 | struct PVSCSIRingsState *s = adapter->rings_state; |
981 | |
982 | return s->msgProdIdx != s->msgConsIdx; |
983 | } |
984 | |
985 | static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) |
986 | { |
987 | struct PVSCSIRingsState *s = adapter->rings_state; |
988 | struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; |
989 | u32 msg_entries = s->msgNumEntriesLog2; |
990 | |
991 | while (pvscsi_msg_pending(adapter)) { |
992 | struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & |
993 | MASK(msg_entries)); |
994 | |
995 | barrier(); |
996 | pvscsi_process_msg(adapter, e); |
997 | barrier(); |
998 | s->msgConsIdx++; |
999 | } |
1000 | } |
1001 | |
1002 | static void pvscsi_msg_workqueue_handler(struct work_struct *data) |
1003 | { |
1004 | struct pvscsi_adapter *adapter; |
1005 | |
1006 | adapter = container_of(data, struct pvscsi_adapter, work); |
1007 | |
1008 | pvscsi_process_msg_ring(adapter); |
1009 | } |
1010 | |
1011 | static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) |
1012 | { |
1013 | char name[32]; |
1014 | |
1015 | if (!pvscsi_use_msg) |
1016 | return 0; |
1017 | |
1018 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, |
1019 | PVSCSI_CMD_SETUP_MSG_RING); |
1020 | |
1021 | if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) |
1022 | return 0; |
1023 | |
1024 | snprintf(name, sizeof(name), |
1025 | "vmw_pvscsi_wq_%u", adapter->host->host_no); |
1026 | |
1027 | adapter->workqueue = create_singlethread_workqueue(name); |
1028 | if (!adapter->workqueue) { |
1029 | printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); |
1030 | return 0; |
1031 | } |
1032 | INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); |
1033 | |
1034 | return 1; |
1035 | } |
1036 | |
1037 | static irqreturn_t pvscsi_isr(int irq, void *devp) |
1038 | { |
1039 | struct pvscsi_adapter *adapter = devp; |
1040 | int handled; |
1041 | |
1042 | if (adapter->use_msi || adapter->use_msix) |
1043 | handled = true; |
1044 | else { |
1045 | u32 val = pvscsi_read_intr_status(adapter); |
1046 | handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0; |
1047 | if (handled) |
1048 | pvscsi_write_intr_status(devp, val); |
1049 | } |
1050 | |
1051 | if (handled) { |
1052 | unsigned long flags; |
1053 | |
1054 | spin_lock_irqsave(&adapter->hw_lock, flags); |
1055 | |
1056 | pvscsi_process_completion_ring(adapter); |
1057 | if (adapter->use_msg && pvscsi_msg_pending(adapter)) |
1058 | queue_work(adapter->workqueue, &adapter->work); |
1059 | |
1060 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
1061 | } |
1062 | |
1063 | return IRQ_RETVAL(handled); |
1064 | } |
1065 | |
1066 | static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) |
1067 | { |
1068 | struct pvscsi_ctx *ctx = adapter->cmd_map; |
1069 | unsigned i; |
1070 | |
1071 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) |
1072 | free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); |
1073 | } |
1074 | |
1075 | static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, |
1076 | unsigned int *irq) |
1077 | { |
1078 | struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION }; |
1079 | int ret; |
1080 | |
1081 | ret = pci_enable_msix(adapter->dev, &entry, 1); |
1082 | if (ret) |
1083 | return ret; |
1084 | |
1085 | *irq = entry.vector; |
1086 | |
1087 | return 0; |
1088 | } |
1089 | |
1090 | static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) |
1091 | { |
1092 | if (adapter->irq) { |
1093 | free_irq(adapter->irq, adapter); |
1094 | adapter->irq = 0; |
1095 | } |
1096 | if (adapter->use_msi) { |
1097 | pci_disable_msi(adapter->dev); |
1098 | adapter->use_msi = 0; |
1099 | } else if (adapter->use_msix) { |
1100 | pci_disable_msix(adapter->dev); |
1101 | adapter->use_msix = 0; |
1102 | } |
1103 | } |
1104 | |
1105 | static void pvscsi_release_resources(struct pvscsi_adapter *adapter) |
1106 | { |
1107 | pvscsi_shutdown_intr(adapter); |
1108 | |
1109 | if (adapter->workqueue) |
1110 | destroy_workqueue(adapter->workqueue); |
1111 | |
1112 | if (adapter->mmioBase) |
1113 | pci_iounmap(adapter->dev, adapter->mmioBase); |
1114 | |
1115 | pci_release_regions(adapter->dev); |
1116 | |
1117 | if (adapter->cmd_map) { |
1118 | pvscsi_free_sgls(adapter); |
1119 | kfree(adapter->cmd_map); |
1120 | } |
1121 | |
1122 | if (adapter->rings_state) |
1123 | pci_free_consistent(adapter->dev, PAGE_SIZE, |
1124 | adapter->rings_state, adapter->ringStatePA); |
1125 | |
1126 | if (adapter->req_ring) |
1127 | pci_free_consistent(adapter->dev, |
1128 | adapter->req_pages * PAGE_SIZE, |
1129 | adapter->req_ring, adapter->reqRingPA); |
1130 | |
1131 | if (adapter->cmp_ring) |
1132 | pci_free_consistent(adapter->dev, |
1133 | adapter->cmp_pages * PAGE_SIZE, |
1134 | adapter->cmp_ring, adapter->cmpRingPA); |
1135 | |
1136 | if (adapter->msg_ring) |
1137 | pci_free_consistent(adapter->dev, |
1138 | adapter->msg_pages * PAGE_SIZE, |
1139 | adapter->msg_ring, adapter->msgRingPA); |
1140 | } |
1141 | |
1142 | /* |
1143 | * Allocate scatter gather lists. |
1144 | * |
1145 | * These are statically allocated. Trying to be clever was not worth it. |
1146 | * |
1147 | * Dynamic allocation can fail, and we can't go deep into the memory |
1148 | * allocator, since we're a SCSI driver, and trying too hard to allocate |
1149 | * memory might generate disk I/O. We also don't want to fail disk I/O |
1150 | * in that case because we can't get an allocation - the I/O could be |
1151 | * trying to swap out data to free memory. Since that is pathological, |
1152 | * just use a statically allocated scatter list. |
1153 | * |
1154 | */ |
1155 | static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) |
1156 | { |
1157 | struct pvscsi_ctx *ctx; |
1158 | int i; |
1159 | |
1160 | ctx = adapter->cmd_map; |
1161 | BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); |
1162 | |
1163 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) { |
1164 | ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, |
1165 | get_order(SGL_SIZE)); |
1166 | ctx->sglPA = 0; |
1167 | BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); |
1168 | if (!ctx->sgl) { |
1169 | for (; i >= 0; --i, --ctx) { |
1170 | free_pages((unsigned long)ctx->sgl, |
1171 | get_order(SGL_SIZE)); |
1172 | ctx->sgl = NULL; |
1173 | } |
1174 | return -ENOMEM; |
1175 | } |
1176 | } |
1177 | |
1178 | return 0; |
1179 | } |
1180 | |
1181 | /* |
1182 | * Query the device, fetch the config info and return the |
1183 | * maximum number of targets on the adapter. In case of |
1184 | * failure due to any reason return default i.e. 16. |
1185 | */ |
1186 | static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) |
1187 | { |
1188 | struct PVSCSICmdDescConfigCmd cmd; |
1189 | struct PVSCSIConfigPageHeader *header; |
1190 | struct device *dev; |
1191 | dma_addr_t configPagePA; |
1192 | void *config_page; |
1193 | u32 numPhys = 16; |
1194 | |
1195 | dev = pvscsi_dev(adapter); |
1196 | config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE, |
1197 | &configPagePA); |
1198 | if (!config_page) { |
1199 | dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n"); |
1200 | goto exit; |
1201 | } |
1202 | BUG_ON(configPagePA & ~PAGE_MASK); |
1203 | |
1204 | /* Fetch config info from the device. */ |
1205 | cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; |
1206 | cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; |
1207 | cmd.cmpAddr = configPagePA; |
1208 | cmd._pad = 0; |
1209 | |
1210 | /* |
1211 | * Mark the completion page header with error values. If the device |
1212 | * completes the command successfully, it sets the status values to |
1213 | * indicate success. |
1214 | */ |
1215 | header = config_page; |
1216 | memset(header, 0, sizeof *header); |
1217 | header->hostStatus = BTSTAT_INVPARAM; |
1218 | header->scsiStatus = SDSTAT_CHECK; |
1219 | |
1220 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd); |
1221 | |
1222 | if (header->hostStatus == BTSTAT_SUCCESS && |
1223 | header->scsiStatus == SDSTAT_GOOD) { |
1224 | struct PVSCSIConfigPageController *config; |
1225 | |
1226 | config = config_page; |
1227 | numPhys = config->numPhys; |
1228 | } else |
1229 | dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n", |
1230 | header->hostStatus, header->scsiStatus); |
1231 | pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA); |
1232 | exit: |
1233 | return numPhys; |
1234 | } |
1235 | |
1236 | static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
1237 | { |
1238 | struct pvscsi_adapter *adapter; |
1239 | struct Scsi_Host *host; |
1240 | struct device *dev; |
1241 | unsigned int i; |
1242 | unsigned long flags = 0; |
1243 | int error; |
1244 | |
1245 | error = -ENODEV; |
1246 | |
1247 | if (pci_enable_device(pdev)) |
1248 | return error; |
1249 | |
1250 | if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 && |
1251 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) { |
1252 | printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); |
1253 | } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 && |
1254 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) { |
1255 | printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); |
1256 | } else { |
1257 | printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); |
1258 | goto out_disable_device; |
1259 | } |
1260 | |
1261 | pvscsi_template.can_queue = |
1262 | min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * |
1263 | PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; |
1264 | pvscsi_template.cmd_per_lun = |
1265 | min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); |
1266 | host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); |
1267 | if (!host) { |
1268 | printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); |
1269 | goto out_disable_device; |
1270 | } |
1271 | |
1272 | adapter = shost_priv(host); |
1273 | memset(adapter, 0, sizeof(*adapter)); |
1274 | adapter->dev = pdev; |
1275 | adapter->host = host; |
1276 | |
1277 | spin_lock_init(&adapter->hw_lock); |
1278 | |
1279 | host->max_channel = 0; |
1280 | host->max_id = 16; |
1281 | host->max_lun = 1; |
1282 | host->max_cmd_len = 16; |
1283 | |
1284 | adapter->rev = pdev->revision; |
1285 | |
1286 | if (pci_request_regions(pdev, "vmw_pvscsi")) { |
1287 | printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); |
1288 | goto out_free_host; |
1289 | } |
1290 | |
1291 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
1292 | if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) |
1293 | continue; |
1294 | |
1295 | if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) |
1296 | continue; |
1297 | |
1298 | break; |
1299 | } |
1300 | |
1301 | if (i == DEVICE_COUNT_RESOURCE) { |
1302 | printk(KERN_ERR |
1303 | "vmw_pvscsi: adapter has no suitable MMIO region\n"); |
1304 | goto out_release_resources; |
1305 | } |
1306 | |
1307 | adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); |
1308 | |
1309 | if (!adapter->mmioBase) { |
1310 | printk(KERN_ERR |
1311 | "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", |
1312 | i, PVSCSI_MEM_SPACE_SIZE); |
1313 | goto out_release_resources; |
1314 | } |
1315 | |
1316 | pci_set_master(pdev); |
1317 | pci_set_drvdata(pdev, host); |
1318 | |
1319 | ll_adapter_reset(adapter); |
1320 | |
1321 | adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); |
1322 | |
1323 | error = pvscsi_allocate_rings(adapter); |
1324 | if (error) { |
1325 | printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); |
1326 | goto out_release_resources; |
1327 | } |
1328 | |
1329 | /* |
1330 | * Ask the device for max number of targets. |
1331 | */ |
1332 | host->max_id = pvscsi_get_max_targets(adapter); |
1333 | dev = pvscsi_dev(adapter); |
1334 | dev_info(dev, "vmw_pvscsi: host->max_id: %u\n", host->max_id); |
1335 | |
1336 | /* |
1337 | * From this point on we should reset the adapter if anything goes |
1338 | * wrong. |
1339 | */ |
1340 | pvscsi_setup_all_rings(adapter); |
1341 | |
1342 | adapter->cmd_map = kcalloc(adapter->req_depth, |
1343 | sizeof(struct pvscsi_ctx), GFP_KERNEL); |
1344 | if (!adapter->cmd_map) { |
1345 | printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); |
1346 | error = -ENOMEM; |
1347 | goto out_reset_adapter; |
1348 | } |
1349 | |
1350 | INIT_LIST_HEAD(&adapter->cmd_pool); |
1351 | for (i = 0; i < adapter->req_depth; i++) { |
1352 | struct pvscsi_ctx *ctx = adapter->cmd_map + i; |
1353 | list_add(&ctx->list, &adapter->cmd_pool); |
1354 | } |
1355 | |
1356 | error = pvscsi_allocate_sg(adapter); |
1357 | if (error) { |
1358 | printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); |
1359 | goto out_reset_adapter; |
1360 | } |
1361 | |
1362 | if (!pvscsi_disable_msix && |
1363 | pvscsi_setup_msix(adapter, &adapter->irq) == 0) { |
1364 | printk(KERN_INFO "vmw_pvscsi: using MSI-X\n"); |
1365 | adapter->use_msix = 1; |
1366 | } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) { |
1367 | printk(KERN_INFO "vmw_pvscsi: using MSI\n"); |
1368 | adapter->use_msi = 1; |
1369 | adapter->irq = pdev->irq; |
1370 | } else { |
1371 | printk(KERN_INFO "vmw_pvscsi: using INTx\n"); |
1372 | adapter->irq = pdev->irq; |
1373 | flags = IRQF_SHARED; |
1374 | } |
1375 | |
1376 | error = request_irq(adapter->irq, pvscsi_isr, flags, |
1377 | "vmw_pvscsi", adapter); |
1378 | if (error) { |
1379 | printk(KERN_ERR |
1380 | "vmw_pvscsi: unable to request IRQ: %d\n", error); |
1381 | adapter->irq = 0; |
1382 | goto out_reset_adapter; |
1383 | } |
1384 | |
1385 | error = scsi_add_host(host, &pdev->dev); |
1386 | if (error) { |
1387 | printk(KERN_ERR |
1388 | "vmw_pvscsi: scsi_add_host failed: %d\n", error); |
1389 | goto out_reset_adapter; |
1390 | } |
1391 | |
1392 | dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", |
1393 | adapter->rev, host->host_no); |
1394 | |
1395 | pvscsi_unmask_intr(adapter); |
1396 | |
1397 | scsi_scan_host(host); |
1398 | |
1399 | return 0; |
1400 | |
1401 | out_reset_adapter: |
1402 | ll_adapter_reset(adapter); |
1403 | out_release_resources: |
1404 | pvscsi_release_resources(adapter); |
1405 | out_free_host: |
1406 | scsi_host_put(host); |
1407 | out_disable_device: |
1408 | pci_set_drvdata(pdev, NULL); |
1409 | pci_disable_device(pdev); |
1410 | |
1411 | return error; |
1412 | } |
1413 | |
1414 | static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) |
1415 | { |
1416 | pvscsi_mask_intr(adapter); |
1417 | |
1418 | if (adapter->workqueue) |
1419 | flush_workqueue(adapter->workqueue); |
1420 | |
1421 | pvscsi_shutdown_intr(adapter); |
1422 | |
1423 | pvscsi_process_request_ring(adapter); |
1424 | pvscsi_process_completion_ring(adapter); |
1425 | ll_adapter_reset(adapter); |
1426 | } |
1427 | |
1428 | static void pvscsi_shutdown(struct pci_dev *dev) |
1429 | { |
1430 | struct Scsi_Host *host = pci_get_drvdata(dev); |
1431 | struct pvscsi_adapter *adapter = shost_priv(host); |
1432 | |
1433 | __pvscsi_shutdown(adapter); |
1434 | } |
1435 | |
1436 | static void pvscsi_remove(struct pci_dev *pdev) |
1437 | { |
1438 | struct Scsi_Host *host = pci_get_drvdata(pdev); |
1439 | struct pvscsi_adapter *adapter = shost_priv(host); |
1440 | |
1441 | scsi_remove_host(host); |
1442 | |
1443 | __pvscsi_shutdown(adapter); |
1444 | pvscsi_release_resources(adapter); |
1445 | |
1446 | scsi_host_put(host); |
1447 | |
1448 | pci_set_drvdata(pdev, NULL); |
1449 | pci_disable_device(pdev); |
1450 | } |
1451 | |
1452 | static struct pci_driver pvscsi_pci_driver = { |
1453 | .name = "vmw_pvscsi", |
1454 | .id_table = pvscsi_pci_tbl, |
1455 | .probe = pvscsi_probe, |
1456 | .remove = pvscsi_remove, |
1457 | .shutdown = pvscsi_shutdown, |
1458 | }; |
1459 | |
1460 | static int __init pvscsi_init(void) |
1461 | { |
1462 | pr_info("%s - version %s\n", |
1463 | PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); |
1464 | return pci_register_driver(&pvscsi_pci_driver); |
1465 | } |
1466 | |
1467 | static void __exit pvscsi_exit(void) |
1468 | { |
1469 | pci_unregister_driver(&pvscsi_pci_driver); |
1470 | } |
1471 | |
1472 | module_init(pvscsi_init); |
1473 | module_exit(pvscsi_exit); |
1474 |
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