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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> | |
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; | |
a2713cce | 65 | struct completion *abort_cmp; |
851b1642 AK |
66 | }; |
67 | ||
68 | struct pvscsi_adapter { | |
69 | char *mmioBase; | |
70 | unsigned int irq; | |
71 | u8 rev; | |
72 | bool use_msi; | |
73 | bool use_msix; | |
74 | bool use_msg; | |
2a815b5a | 75 | bool use_req_threshold; |
851b1642 AK |
76 | |
77 | spinlock_t hw_lock; | |
78 | ||
79 | struct workqueue_struct *workqueue; | |
80 | struct work_struct work; | |
81 | ||
82 | struct PVSCSIRingReqDesc *req_ring; | |
83 | unsigned req_pages; | |
84 | unsigned req_depth; | |
85 | dma_addr_t reqRingPA; | |
86 | ||
87 | struct PVSCSIRingCmpDesc *cmp_ring; | |
88 | unsigned cmp_pages; | |
89 | dma_addr_t cmpRingPA; | |
90 | ||
91 | struct PVSCSIRingMsgDesc *msg_ring; | |
92 | unsigned msg_pages; | |
93 | dma_addr_t msgRingPA; | |
94 | ||
95 | struct PVSCSIRingsState *rings_state; | |
96 | dma_addr_t ringStatePA; | |
97 | ||
98 | struct pci_dev *dev; | |
99 | struct Scsi_Host *host; | |
100 | ||
101 | struct list_head cmd_pool; | |
102 | struct pvscsi_ctx *cmd_map; | |
103 | }; | |
104 | ||
105 | ||
106 | /* Command line parameters */ | |
107 | static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING; | |
108 | static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; | |
109 | static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; | |
110 | static bool pvscsi_disable_msi; | |
111 | static bool pvscsi_disable_msix; | |
112 | static bool pvscsi_use_msg = true; | |
2a815b5a | 113 | static bool pvscsi_use_req_threshold = true; |
851b1642 AK |
114 | |
115 | #define PVSCSI_RW (S_IRUSR | S_IWUSR) | |
116 | ||
117 | module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); | |
118 | MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" | |
119 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")"); | |
120 | ||
121 | module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); | |
122 | MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" | |
123 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); | |
124 | ||
125 | module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); | |
126 | MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" | |
127 | __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")"); | |
128 | ||
129 | module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); | |
130 | MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); | |
131 | ||
132 | module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); | |
133 | MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); | |
134 | ||
135 | module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); | |
136 | MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); | |
137 | ||
2a815b5a RM |
138 | module_param_named(use_req_threshold, pvscsi_use_req_threshold, |
139 | bool, PVSCSI_RW); | |
140 | MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)"); | |
141 | ||
851b1642 AK |
142 | static const struct pci_device_id pvscsi_pci_tbl[] = { |
143 | { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, | |
144 | { 0 } | |
145 | }; | |
146 | ||
147 | MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); | |
148 | ||
149 | static struct device * | |
150 | pvscsi_dev(const struct pvscsi_adapter *adapter) | |
151 | { | |
152 | return &(adapter->dev->dev); | |
153 | } | |
154 | ||
155 | static struct pvscsi_ctx * | |
156 | pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) | |
157 | { | |
158 | struct pvscsi_ctx *ctx, *end; | |
159 | ||
160 | end = &adapter->cmd_map[adapter->req_depth]; | |
161 | for (ctx = adapter->cmd_map; ctx < end; ctx++) | |
162 | if (ctx->cmd == cmd) | |
163 | return ctx; | |
164 | ||
165 | return NULL; | |
166 | } | |
167 | ||
168 | static struct pvscsi_ctx * | |
169 | pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) | |
170 | { | |
171 | struct pvscsi_ctx *ctx; | |
172 | ||
173 | if (list_empty(&adapter->cmd_pool)) | |
174 | return NULL; | |
175 | ||
176 | ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); | |
177 | ctx->cmd = cmd; | |
178 | list_del(&ctx->list); | |
179 | ||
180 | return ctx; | |
181 | } | |
182 | ||
183 | static void pvscsi_release_context(struct pvscsi_adapter *adapter, | |
184 | struct pvscsi_ctx *ctx) | |
185 | { | |
186 | ctx->cmd = NULL; | |
a2713cce | 187 | ctx->abort_cmp = NULL; |
851b1642 AK |
188 | list_add(&ctx->list, &adapter->cmd_pool); |
189 | } | |
190 | ||
191 | /* | |
192 | * Map a pvscsi_ctx struct to a context ID field value; we map to a simple | |
193 | * non-zero integer. ctx always points to an entry in cmd_map array, hence | |
194 | * the return value is always >=1. | |
195 | */ | |
196 | static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, | |
197 | const struct pvscsi_ctx *ctx) | |
198 | { | |
199 | return ctx - adapter->cmd_map + 1; | |
200 | } | |
201 | ||
202 | static struct pvscsi_ctx * | |
203 | pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) | |
204 | { | |
205 | return &adapter->cmd_map[context - 1]; | |
206 | } | |
207 | ||
208 | static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, | |
209 | u32 offset, u32 val) | |
210 | { | |
211 | writel(val, adapter->mmioBase + offset); | |
212 | } | |
213 | ||
214 | static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) | |
215 | { | |
216 | return readl(adapter->mmioBase + offset); | |
217 | } | |
218 | ||
219 | static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) | |
220 | { | |
221 | return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); | |
222 | } | |
223 | ||
224 | static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, | |
225 | u32 val) | |
226 | { | |
227 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); | |
228 | } | |
229 | ||
230 | static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) | |
231 | { | |
232 | u32 intr_bits; | |
233 | ||
234 | intr_bits = PVSCSI_INTR_CMPL_MASK; | |
235 | if (adapter->use_msg) | |
236 | intr_bits |= PVSCSI_INTR_MSG_MASK; | |
237 | ||
238 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); | |
239 | } | |
240 | ||
241 | static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) | |
242 | { | |
243 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); | |
244 | } | |
245 | ||
246 | static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, | |
247 | u32 cmd, const void *desc, size_t len) | |
248 | { | |
249 | const u32 *ptr = desc; | |
250 | size_t i; | |
251 | ||
252 | len /= sizeof(*ptr); | |
253 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); | |
254 | for (i = 0; i < len; i++) | |
255 | pvscsi_reg_write(adapter, | |
256 | PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); | |
257 | } | |
258 | ||
259 | static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, | |
260 | const struct pvscsi_ctx *ctx) | |
261 | { | |
262 | struct PVSCSICmdDescAbortCmd cmd = { 0 }; | |
263 | ||
264 | cmd.target = ctx->cmd->device->id; | |
265 | cmd.context = pvscsi_map_context(adapter, ctx); | |
266 | ||
267 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); | |
268 | } | |
269 | ||
270 | static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) | |
271 | { | |
272 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); | |
273 | } | |
274 | ||
275 | static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) | |
276 | { | |
277 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); | |
278 | } | |
279 | ||
280 | static int scsi_is_rw(unsigned char op) | |
281 | { | |
282 | return op == READ_6 || op == WRITE_6 || | |
283 | op == READ_10 || op == WRITE_10 || | |
284 | op == READ_12 || op == WRITE_12 || | |
285 | op == READ_16 || op == WRITE_16; | |
286 | } | |
287 | ||
288 | static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, | |
289 | unsigned char op) | |
290 | { | |
2a815b5a RM |
291 | if (scsi_is_rw(op)) { |
292 | struct PVSCSIRingsState *s = adapter->rings_state; | |
293 | ||
294 | if (!adapter->use_req_threshold || | |
295 | s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) | |
296 | pvscsi_kick_rw_io(adapter); | |
297 | } else { | |
851b1642 | 298 | pvscsi_process_request_ring(adapter); |
2a815b5a | 299 | } |
851b1642 AK |
300 | } |
301 | ||
302 | static void ll_adapter_reset(const struct pvscsi_adapter *adapter) | |
303 | { | |
304 | dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); | |
305 | ||
306 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); | |
307 | } | |
308 | ||
309 | static void ll_bus_reset(const struct pvscsi_adapter *adapter) | |
310 | { | |
59e13d48 | 311 | dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter); |
851b1642 AK |
312 | |
313 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); | |
314 | } | |
315 | ||
316 | static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) | |
317 | { | |
318 | struct PVSCSICmdDescResetDevice cmd = { 0 }; | |
319 | ||
59e13d48 | 320 | dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target); |
851b1642 AK |
321 | |
322 | cmd.target = target; | |
323 | ||
324 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, | |
325 | &cmd, sizeof(cmd)); | |
326 | } | |
327 | ||
328 | static void pvscsi_create_sg(struct pvscsi_ctx *ctx, | |
329 | struct scatterlist *sg, unsigned count) | |
330 | { | |
331 | unsigned i; | |
332 | struct PVSCSISGElement *sge; | |
333 | ||
334 | BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); | |
335 | ||
336 | sge = &ctx->sgl->sge[0]; | |
337 | for (i = 0; i < count; i++, sg++) { | |
338 | sge[i].addr = sg_dma_address(sg); | |
339 | sge[i].length = sg_dma_len(sg); | |
340 | sge[i].flags = 0; | |
341 | } | |
342 | } | |
343 | ||
344 | /* | |
345 | * Map all data buffers for a command into PCI space and | |
346 | * setup the scatter/gather list if needed. | |
347 | */ | |
348 | static void pvscsi_map_buffers(struct pvscsi_adapter *adapter, | |
349 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, | |
350 | struct PVSCSIRingReqDesc *e) | |
351 | { | |
352 | unsigned count; | |
353 | unsigned bufflen = scsi_bufflen(cmd); | |
354 | struct scatterlist *sg; | |
355 | ||
356 | e->dataLen = bufflen; | |
357 | e->dataAddr = 0; | |
358 | if (bufflen == 0) | |
359 | return; | |
360 | ||
361 | sg = scsi_sglist(cmd); | |
362 | count = scsi_sg_count(cmd); | |
363 | if (count != 0) { | |
364 | int segs = scsi_dma_map(cmd); | |
365 | if (segs > 1) { | |
366 | pvscsi_create_sg(ctx, sg, segs); | |
367 | ||
368 | e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; | |
369 | ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl, | |
370 | SGL_SIZE, PCI_DMA_TODEVICE); | |
371 | e->dataAddr = ctx->sglPA; | |
372 | } else | |
373 | e->dataAddr = sg_dma_address(sg); | |
374 | } else { | |
375 | /* | |
376 | * In case there is no S/G list, scsi_sglist points | |
377 | * directly to the buffer. | |
378 | */ | |
379 | ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen, | |
380 | cmd->sc_data_direction); | |
381 | e->dataAddr = ctx->dataPA; | |
382 | } | |
383 | } | |
384 | ||
385 | static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, | |
386 | struct pvscsi_ctx *ctx) | |
387 | { | |
388 | struct scsi_cmnd *cmd; | |
389 | unsigned bufflen; | |
390 | ||
391 | cmd = ctx->cmd; | |
392 | bufflen = scsi_bufflen(cmd); | |
393 | ||
394 | if (bufflen != 0) { | |
395 | unsigned count = scsi_sg_count(cmd); | |
396 | ||
397 | if (count != 0) { | |
398 | scsi_dma_unmap(cmd); | |
399 | if (ctx->sglPA) { | |
400 | pci_unmap_single(adapter->dev, ctx->sglPA, | |
401 | SGL_SIZE, PCI_DMA_TODEVICE); | |
402 | ctx->sglPA = 0; | |
403 | } | |
404 | } else | |
405 | pci_unmap_single(adapter->dev, ctx->dataPA, bufflen, | |
406 | cmd->sc_data_direction); | |
407 | } | |
408 | if (cmd->sense_buffer) | |
409 | pci_unmap_single(adapter->dev, ctx->sensePA, | |
410 | SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); | |
411 | } | |
412 | ||
6f039790 | 413 | static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) |
851b1642 AK |
414 | { |
415 | adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE, | |
416 | &adapter->ringStatePA); | |
417 | if (!adapter->rings_state) | |
418 | return -ENOMEM; | |
419 | ||
420 | adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, | |
421 | pvscsi_ring_pages); | |
422 | adapter->req_depth = adapter->req_pages | |
423 | * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; | |
424 | adapter->req_ring = pci_alloc_consistent(adapter->dev, | |
425 | adapter->req_pages * PAGE_SIZE, | |
426 | &adapter->reqRingPA); | |
427 | if (!adapter->req_ring) | |
428 | return -ENOMEM; | |
429 | ||
430 | adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, | |
431 | pvscsi_ring_pages); | |
432 | adapter->cmp_ring = pci_alloc_consistent(adapter->dev, | |
433 | adapter->cmp_pages * PAGE_SIZE, | |
434 | &adapter->cmpRingPA); | |
435 | if (!adapter->cmp_ring) | |
436 | return -ENOMEM; | |
437 | ||
438 | BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); | |
439 | BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); | |
440 | BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); | |
441 | ||
442 | if (!adapter->use_msg) | |
443 | return 0; | |
444 | ||
445 | adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, | |
446 | pvscsi_msg_ring_pages); | |
447 | adapter->msg_ring = pci_alloc_consistent(adapter->dev, | |
448 | adapter->msg_pages * PAGE_SIZE, | |
449 | &adapter->msgRingPA); | |
450 | if (!adapter->msg_ring) | |
451 | return -ENOMEM; | |
452 | BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) | |
458 | { | |
459 | struct PVSCSICmdDescSetupRings cmd = { 0 }; | |
460 | dma_addr_t base; | |
461 | unsigned i; | |
462 | ||
463 | cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; | |
464 | cmd.reqRingNumPages = adapter->req_pages; | |
465 | cmd.cmpRingNumPages = adapter->cmp_pages; | |
466 | ||
467 | base = adapter->reqRingPA; | |
468 | for (i = 0; i < adapter->req_pages; i++) { | |
469 | cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; | |
470 | base += PAGE_SIZE; | |
471 | } | |
472 | ||
473 | base = adapter->cmpRingPA; | |
474 | for (i = 0; i < adapter->cmp_pages; i++) { | |
475 | cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; | |
476 | base += PAGE_SIZE; | |
477 | } | |
478 | ||
479 | memset(adapter->rings_state, 0, PAGE_SIZE); | |
480 | memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); | |
481 | memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); | |
482 | ||
483 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, | |
484 | &cmd, sizeof(cmd)); | |
485 | ||
486 | if (adapter->use_msg) { | |
487 | struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; | |
488 | ||
489 | cmd_msg.numPages = adapter->msg_pages; | |
490 | ||
491 | base = adapter->msgRingPA; | |
492 | for (i = 0; i < adapter->msg_pages; i++) { | |
493 | cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; | |
494 | base += PAGE_SIZE; | |
495 | } | |
496 | memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); | |
497 | ||
498 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, | |
499 | &cmd_msg, sizeof(cmd_msg)); | |
500 | } | |
501 | } | |
502 | ||
503 | /* | |
504 | * Pull a completion descriptor off and pass the completion back | |
505 | * to the SCSI mid layer. | |
506 | */ | |
507 | static void pvscsi_complete_request(struct pvscsi_adapter *adapter, | |
508 | const struct PVSCSIRingCmpDesc *e) | |
509 | { | |
510 | struct pvscsi_ctx *ctx; | |
511 | struct scsi_cmnd *cmd; | |
a2713cce | 512 | struct completion *abort_cmp; |
851b1642 AK |
513 | u32 btstat = e->hostStatus; |
514 | u32 sdstat = e->scsiStatus; | |
515 | ||
516 | ctx = pvscsi_get_context(adapter, e->context); | |
517 | cmd = ctx->cmd; | |
a2713cce | 518 | abort_cmp = ctx->abort_cmp; |
851b1642 AK |
519 | pvscsi_unmap_buffers(adapter, ctx); |
520 | pvscsi_release_context(adapter, ctx); | |
a2713cce AK |
521 | if (abort_cmp) { |
522 | /* | |
523 | * The command was requested to be aborted. Just signal that | |
524 | * the request completed and swallow the actual cmd completion | |
525 | * here. The abort handler will post a completion for this | |
526 | * command indicating that it got successfully aborted. | |
527 | */ | |
528 | complete(abort_cmp); | |
529 | return; | |
530 | } | |
851b1642 | 531 | |
a2713cce | 532 | cmd->result = 0; |
851b1642 AK |
533 | if (sdstat != SAM_STAT_GOOD && |
534 | (btstat == BTSTAT_SUCCESS || | |
535 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED || | |
536 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { | |
537 | cmd->result = (DID_OK << 16) | sdstat; | |
538 | if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer) | |
539 | cmd->result |= (DRIVER_SENSE << 24); | |
540 | } else | |
541 | switch (btstat) { | |
542 | case BTSTAT_SUCCESS: | |
543 | case BTSTAT_LINKED_COMMAND_COMPLETED: | |
544 | case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: | |
545 | /* If everything went fine, let's move on.. */ | |
546 | cmd->result = (DID_OK << 16); | |
547 | break; | |
548 | ||
549 | case BTSTAT_DATARUN: | |
550 | case BTSTAT_DATA_UNDERRUN: | |
551 | /* Report residual data in underruns */ | |
552 | scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); | |
553 | cmd->result = (DID_ERROR << 16); | |
554 | break; | |
555 | ||
556 | case BTSTAT_SELTIMEO: | |
557 | /* Our emulation returns this for non-connected devs */ | |
558 | cmd->result = (DID_BAD_TARGET << 16); | |
559 | break; | |
560 | ||
561 | case BTSTAT_LUNMISMATCH: | |
562 | case BTSTAT_TAGREJECT: | |
563 | case BTSTAT_BADMSG: | |
564 | cmd->result = (DRIVER_INVALID << 24); | |
565 | /* fall through */ | |
566 | ||
567 | case BTSTAT_HAHARDWARE: | |
568 | case BTSTAT_INVPHASE: | |
569 | case BTSTAT_HATIMEOUT: | |
570 | case BTSTAT_NORESPONSE: | |
571 | case BTSTAT_DISCONNECT: | |
572 | case BTSTAT_HASOFTWARE: | |
573 | case BTSTAT_BUSFREE: | |
574 | case BTSTAT_SENSFAILED: | |
575 | cmd->result |= (DID_ERROR << 16); | |
576 | break; | |
577 | ||
578 | case BTSTAT_SENTRST: | |
579 | case BTSTAT_RECVRST: | |
580 | case BTSTAT_BUSRESET: | |
581 | cmd->result = (DID_RESET << 16); | |
582 | break; | |
583 | ||
584 | case BTSTAT_ABORTQUEUE: | |
585 | cmd->result = (DID_ABORT << 16); | |
586 | break; | |
587 | ||
588 | case BTSTAT_SCSIPARITY: | |
589 | cmd->result = (DID_PARITY << 16); | |
590 | break; | |
591 | ||
592 | default: | |
593 | cmd->result = (DID_ERROR << 16); | |
594 | scmd_printk(KERN_DEBUG, cmd, | |
595 | "Unknown completion status: 0x%x\n", | |
596 | btstat); | |
597 | } | |
598 | ||
599 | dev_dbg(&cmd->device->sdev_gendev, | |
600 | "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", | |
601 | cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); | |
602 | ||
603 | cmd->scsi_done(cmd); | |
604 | } | |
605 | ||
606 | /* | |
607 | * barrier usage : Since the PVSCSI device is emulated, there could be cases | |
608 | * where we may want to serialize some accesses between the driver and the | |
609 | * emulation layer. We use compiler barriers instead of the more expensive | |
610 | * memory barriers because PVSCSI is only supported on X86 which has strong | |
611 | * memory access ordering. | |
612 | */ | |
613 | static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) | |
614 | { | |
615 | struct PVSCSIRingsState *s = adapter->rings_state; | |
616 | struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; | |
617 | u32 cmp_entries = s->cmpNumEntriesLog2; | |
618 | ||
619 | while (s->cmpConsIdx != s->cmpProdIdx) { | |
620 | struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & | |
621 | MASK(cmp_entries)); | |
622 | /* | |
623 | * This barrier() ensures that *e is not dereferenced while | |
624 | * the device emulation still writes data into the slot. | |
625 | * Since the device emulation advances s->cmpProdIdx only after | |
626 | * updating the slot we want to check it first. | |
627 | */ | |
628 | barrier(); | |
629 | pvscsi_complete_request(adapter, e); | |
630 | /* | |
631 | * This barrier() ensures that compiler doesn't reorder write | |
632 | * to s->cmpConsIdx before the read of (*e) inside | |
633 | * pvscsi_complete_request. Otherwise, device emulation may | |
634 | * overwrite *e before we had a chance to read it. | |
635 | */ | |
636 | barrier(); | |
637 | s->cmpConsIdx++; | |
638 | } | |
639 | } | |
640 | ||
641 | /* | |
642 | * Translate a Linux SCSI request into a request ring entry. | |
643 | */ | |
644 | static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, | |
645 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) | |
646 | { | |
647 | struct PVSCSIRingsState *s; | |
648 | struct PVSCSIRingReqDesc *e; | |
649 | struct scsi_device *sdev; | |
650 | u32 req_entries; | |
651 | ||
652 | s = adapter->rings_state; | |
653 | sdev = cmd->device; | |
654 | req_entries = s->reqNumEntriesLog2; | |
655 | ||
656 | /* | |
657 | * If this condition holds, we might have room on the request ring, but | |
658 | * we might not have room on the completion ring for the response. | |
659 | * However, we have already ruled out this possibility - we would not | |
660 | * have successfully allocated a context if it were true, since we only | |
661 | * have one context per request entry. Check for it anyway, since it | |
662 | * would be a serious bug. | |
663 | */ | |
664 | if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { | |
665 | scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " | |
666 | "ring full: reqProdIdx=%d cmpConsIdx=%d\n", | |
667 | s->reqProdIdx, s->cmpConsIdx); | |
668 | return -1; | |
669 | } | |
670 | ||
671 | e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); | |
672 | ||
673 | e->bus = sdev->channel; | |
674 | e->target = sdev->id; | |
675 | memset(e->lun, 0, sizeof(e->lun)); | |
676 | e->lun[1] = sdev->lun; | |
677 | ||
678 | if (cmd->sense_buffer) { | |
679 | ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer, | |
680 | SCSI_SENSE_BUFFERSIZE, | |
681 | PCI_DMA_FROMDEVICE); | |
682 | e->senseAddr = ctx->sensePA; | |
683 | e->senseLen = SCSI_SENSE_BUFFERSIZE; | |
684 | } else { | |
685 | e->senseLen = 0; | |
686 | e->senseAddr = 0; | |
687 | } | |
688 | e->cdbLen = cmd->cmd_len; | |
689 | e->vcpuHint = smp_processor_id(); | |
690 | memcpy(e->cdb, cmd->cmnd, e->cdbLen); | |
691 | ||
692 | e->tag = SIMPLE_QUEUE_TAG; | |
693 | if (sdev->tagged_supported && | |
694 | (cmd->tag == HEAD_OF_QUEUE_TAG || | |
695 | cmd->tag == ORDERED_QUEUE_TAG)) | |
696 | e->tag = cmd->tag; | |
697 | ||
698 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) | |
699 | e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; | |
700 | else if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
701 | e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; | |
702 | else if (cmd->sc_data_direction == DMA_NONE) | |
703 | e->flags = PVSCSI_FLAG_CMD_DIR_NONE; | |
704 | else | |
705 | e->flags = 0; | |
706 | ||
707 | pvscsi_map_buffers(adapter, ctx, cmd, e); | |
708 | ||
709 | e->context = pvscsi_map_context(adapter, ctx); | |
710 | ||
711 | barrier(); | |
712 | ||
713 | s->reqProdIdx++; | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
f281233d | 718 | static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) |
851b1642 AK |
719 | { |
720 | struct Scsi_Host *host = cmd->device->host; | |
721 | struct pvscsi_adapter *adapter = shost_priv(host); | |
722 | struct pvscsi_ctx *ctx; | |
723 | unsigned long flags; | |
724 | ||
725 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
726 | ||
727 | ctx = pvscsi_acquire_context(adapter, cmd); | |
728 | if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { | |
729 | if (ctx) | |
730 | pvscsi_release_context(adapter, ctx); | |
731 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
732 | return SCSI_MLQUEUE_HOST_BUSY; | |
733 | } | |
734 | ||
735 | cmd->scsi_done = done; | |
736 | ||
737 | dev_dbg(&cmd->device->sdev_gendev, | |
738 | "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]); | |
739 | ||
740 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
741 | ||
742 | pvscsi_kick_io(adapter, cmd->cmnd[0]); | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
f281233d JG |
747 | static DEF_SCSI_QCMD(pvscsi_queue) |
748 | ||
851b1642 AK |
749 | static int pvscsi_abort(struct scsi_cmnd *cmd) |
750 | { | |
751 | struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); | |
752 | struct pvscsi_ctx *ctx; | |
753 | unsigned long flags; | |
a2713cce AK |
754 | int result = SUCCESS; |
755 | DECLARE_COMPLETION_ONSTACK(abort_cmp); | |
851b1642 AK |
756 | |
757 | scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", | |
758 | adapter->host->host_no, cmd); | |
759 | ||
760 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
761 | ||
762 | /* | |
763 | * Poll the completion ring first - we might be trying to abort | |
764 | * a command that is waiting to be dispatched in the completion ring. | |
765 | */ | |
766 | pvscsi_process_completion_ring(adapter); | |
767 | ||
768 | /* | |
769 | * If there is no context for the command, it either already succeeded | |
770 | * or else was never properly issued. Not our problem. | |
771 | */ | |
772 | ctx = pvscsi_find_context(adapter, cmd); | |
773 | if (!ctx) { | |
774 | scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); | |
775 | goto out; | |
776 | } | |
777 | ||
a2713cce AK |
778 | /* |
779 | * Mark that the command has been requested to be aborted and issue | |
780 | * the abort. | |
781 | */ | |
782 | ctx->abort_cmp = &abort_cmp; | |
783 | ||
851b1642 | 784 | pvscsi_abort_cmd(adapter, ctx); |
a2713cce AK |
785 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
786 | /* Wait for 2 secs for the completion. */ | |
787 | wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000)); | |
788 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
851b1642 | 789 | |
a2713cce AK |
790 | if (!completion_done(&abort_cmp)) { |
791 | /* | |
792 | * Failed to abort the command, unmark the fact that it | |
793 | * was requested to be aborted. | |
794 | */ | |
795 | ctx->abort_cmp = NULL; | |
796 | result = FAILED; | |
797 | scmd_printk(KERN_DEBUG, cmd, | |
798 | "Failed to get completion for aborted cmd %p\n", | |
799 | cmd); | |
800 | goto out; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Successfully aborted the command. | |
805 | */ | |
806 | cmd->result = (DID_ABORT << 16); | |
807 | cmd->scsi_done(cmd); | |
851b1642 AK |
808 | |
809 | out: | |
810 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
a2713cce | 811 | return result; |
851b1642 AK |
812 | } |
813 | ||
814 | /* | |
815 | * Abort all outstanding requests. This is only safe to use if the completion | |
816 | * ring will never be walked again or the device has been reset, because it | |
817 | * destroys the 1-1 mapping between context field passed to emulation and our | |
818 | * request structure. | |
819 | */ | |
820 | static void pvscsi_reset_all(struct pvscsi_adapter *adapter) | |
821 | { | |
822 | unsigned i; | |
823 | ||
824 | for (i = 0; i < adapter->req_depth; i++) { | |
825 | struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; | |
826 | struct scsi_cmnd *cmd = ctx->cmd; | |
827 | if (cmd) { | |
828 | scmd_printk(KERN_ERR, cmd, | |
829 | "Forced reset on cmd %p\n", cmd); | |
830 | pvscsi_unmap_buffers(adapter, ctx); | |
831 | pvscsi_release_context(adapter, ctx); | |
832 | cmd->result = (DID_RESET << 16); | |
833 | cmd->scsi_done(cmd); | |
834 | } | |
835 | } | |
836 | } | |
837 | ||
838 | static int pvscsi_host_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 | bool use_msg; | |
844 | ||
845 | scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); | |
846 | ||
847 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
848 | ||
849 | use_msg = adapter->use_msg; | |
850 | ||
851 | if (use_msg) { | |
852 | adapter->use_msg = 0; | |
853 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
854 | ||
855 | /* | |
856 | * Now that we know that the ISR won't add more work on the | |
857 | * workqueue we can safely flush any outstanding work. | |
858 | */ | |
859 | flush_workqueue(adapter->workqueue); | |
860 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
861 | } | |
862 | ||
863 | /* | |
864 | * We're going to tear down the entire ring structure and set it back | |
865 | * up, so stalling new requests until all completions are flushed and | |
866 | * the rings are back in place. | |
867 | */ | |
868 | ||
869 | pvscsi_process_request_ring(adapter); | |
870 | ||
871 | ll_adapter_reset(adapter); | |
872 | ||
873 | /* | |
874 | * Now process any completions. Note we do this AFTER adapter reset, | |
875 | * which is strange, but stops races where completions get posted | |
876 | * between processing the ring and issuing the reset. The backend will | |
877 | * not touch the ring memory after reset, so the immediately pre-reset | |
878 | * completion ring state is still valid. | |
879 | */ | |
880 | pvscsi_process_completion_ring(adapter); | |
881 | ||
882 | pvscsi_reset_all(adapter); | |
883 | adapter->use_msg = use_msg; | |
884 | pvscsi_setup_all_rings(adapter); | |
885 | pvscsi_unmask_intr(adapter); | |
886 | ||
887 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
888 | ||
889 | return SUCCESS; | |
890 | } | |
891 | ||
892 | static int pvscsi_bus_reset(struct scsi_cmnd *cmd) | |
893 | { | |
894 | struct Scsi_Host *host = cmd->device->host; | |
895 | struct pvscsi_adapter *adapter = shost_priv(host); | |
896 | unsigned long flags; | |
897 | ||
898 | scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); | |
899 | ||
900 | /* | |
901 | * We don't want to queue new requests for this bus after | |
902 | * flushing all pending requests to emulation, since new | |
903 | * requests could then sneak in during this bus reset phase, | |
904 | * so take the lock now. | |
905 | */ | |
906 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
907 | ||
908 | pvscsi_process_request_ring(adapter); | |
909 | ll_bus_reset(adapter); | |
910 | pvscsi_process_completion_ring(adapter); | |
911 | ||
912 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
913 | ||
914 | return SUCCESS; | |
915 | } | |
916 | ||
917 | static int pvscsi_device_reset(struct scsi_cmnd *cmd) | |
918 | { | |
919 | struct Scsi_Host *host = cmd->device->host; | |
920 | struct pvscsi_adapter *adapter = shost_priv(host); | |
921 | unsigned long flags; | |
922 | ||
923 | scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", | |
924 | host->host_no, cmd->device->id); | |
925 | ||
926 | /* | |
927 | * We don't want to queue new requests for this device after flushing | |
928 | * all pending requests to emulation, since new requests could then | |
929 | * sneak in during this device reset phase, so take the lock now. | |
930 | */ | |
931 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
932 | ||
933 | pvscsi_process_request_ring(adapter); | |
934 | ll_device_reset(adapter, cmd->device->id); | |
935 | pvscsi_process_completion_ring(adapter); | |
936 | ||
937 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
938 | ||
939 | return SUCCESS; | |
940 | } | |
941 | ||
942 | static struct scsi_host_template pvscsi_template; | |
943 | ||
944 | static const char *pvscsi_info(struct Scsi_Host *host) | |
945 | { | |
946 | struct pvscsi_adapter *adapter = shost_priv(host); | |
947 | static char buf[256]; | |
948 | ||
949 | sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " | |
950 | "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, | |
951 | adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, | |
952 | pvscsi_template.cmd_per_lun); | |
953 | ||
954 | return buf; | |
955 | } | |
956 | ||
957 | static struct scsi_host_template pvscsi_template = { | |
958 | .module = THIS_MODULE, | |
959 | .name = "VMware PVSCSI Host Adapter", | |
960 | .proc_name = "vmw_pvscsi", | |
961 | .info = pvscsi_info, | |
962 | .queuecommand = pvscsi_queue, | |
963 | .this_id = -1, | |
964 | .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, | |
965 | .dma_boundary = UINT_MAX, | |
966 | .max_sectors = 0xffff, | |
967 | .use_clustering = ENABLE_CLUSTERING, | |
968 | .eh_abort_handler = pvscsi_abort, | |
969 | .eh_device_reset_handler = pvscsi_device_reset, | |
970 | .eh_bus_reset_handler = pvscsi_bus_reset, | |
971 | .eh_host_reset_handler = pvscsi_host_reset, | |
972 | }; | |
973 | ||
974 | static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, | |
975 | const struct PVSCSIRingMsgDesc *e) | |
976 | { | |
977 | struct PVSCSIRingsState *s = adapter->rings_state; | |
978 | struct Scsi_Host *host = adapter->host; | |
979 | struct scsi_device *sdev; | |
980 | ||
981 | printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", | |
982 | e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); | |
983 | ||
984 | BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); | |
985 | ||
986 | if (e->type == PVSCSI_MSG_DEV_ADDED) { | |
987 | struct PVSCSIMsgDescDevStatusChanged *desc; | |
988 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; | |
989 | ||
990 | printk(KERN_INFO | |
991 | "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", | |
992 | desc->bus, desc->target, desc->lun[1]); | |
993 | ||
994 | if (!scsi_host_get(host)) | |
995 | return; | |
996 | ||
997 | sdev = scsi_device_lookup(host, desc->bus, desc->target, | |
998 | desc->lun[1]); | |
999 | if (sdev) { | |
1000 | printk(KERN_INFO "vmw_pvscsi: device already exists\n"); | |
1001 | scsi_device_put(sdev); | |
1002 | } else | |
1003 | scsi_add_device(adapter->host, desc->bus, | |
1004 | desc->target, desc->lun[1]); | |
1005 | ||
1006 | scsi_host_put(host); | |
1007 | } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { | |
1008 | struct PVSCSIMsgDescDevStatusChanged *desc; | |
1009 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; | |
1010 | ||
1011 | printk(KERN_INFO | |
1012 | "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", | |
1013 | desc->bus, desc->target, desc->lun[1]); | |
1014 | ||
1015 | if (!scsi_host_get(host)) | |
1016 | return; | |
1017 | ||
1018 | sdev = scsi_device_lookup(host, desc->bus, desc->target, | |
1019 | desc->lun[1]); | |
1020 | if (sdev) { | |
1021 | scsi_remove_device(sdev); | |
1022 | scsi_device_put(sdev); | |
1023 | } else | |
1024 | printk(KERN_INFO | |
1025 | "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", | |
1026 | desc->bus, desc->target, desc->lun[1]); | |
1027 | ||
1028 | scsi_host_put(host); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) | |
1033 | { | |
1034 | struct PVSCSIRingsState *s = adapter->rings_state; | |
1035 | ||
1036 | return s->msgProdIdx != s->msgConsIdx; | |
1037 | } | |
1038 | ||
1039 | static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) | |
1040 | { | |
1041 | struct PVSCSIRingsState *s = adapter->rings_state; | |
1042 | struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; | |
1043 | u32 msg_entries = s->msgNumEntriesLog2; | |
1044 | ||
1045 | while (pvscsi_msg_pending(adapter)) { | |
1046 | struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & | |
1047 | MASK(msg_entries)); | |
1048 | ||
1049 | barrier(); | |
1050 | pvscsi_process_msg(adapter, e); | |
1051 | barrier(); | |
1052 | s->msgConsIdx++; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | static void pvscsi_msg_workqueue_handler(struct work_struct *data) | |
1057 | { | |
1058 | struct pvscsi_adapter *adapter; | |
1059 | ||
1060 | adapter = container_of(data, struct pvscsi_adapter, work); | |
1061 | ||
1062 | pvscsi_process_msg_ring(adapter); | |
1063 | } | |
1064 | ||
1065 | static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) | |
1066 | { | |
1067 | char name[32]; | |
1068 | ||
1069 | if (!pvscsi_use_msg) | |
1070 | return 0; | |
1071 | ||
1072 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, | |
1073 | PVSCSI_CMD_SETUP_MSG_RING); | |
1074 | ||
1075 | if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) | |
1076 | return 0; | |
1077 | ||
1078 | snprintf(name, sizeof(name), | |
1079 | "vmw_pvscsi_wq_%u", adapter->host->host_no); | |
1080 | ||
1081 | adapter->workqueue = create_singlethread_workqueue(name); | |
1082 | if (!adapter->workqueue) { | |
1083 | printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); | |
1084 | return 0; | |
1085 | } | |
1086 | INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); | |
1087 | ||
1088 | return 1; | |
1089 | } | |
1090 | ||
2a815b5a RM |
1091 | static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, |
1092 | bool enable) | |
1093 | { | |
1094 | u32 val; | |
1095 | ||
1096 | if (!pvscsi_use_req_threshold) | |
1097 | return false; | |
1098 | ||
1099 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, | |
1100 | PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); | |
1101 | val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS); | |
1102 | if (val == -1) { | |
1103 | printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n"); | |
1104 | return false; | |
1105 | } else { | |
1106 | struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; | |
1107 | cmd_msg.enable = enable; | |
1108 | printk(KERN_INFO | |
1109 | "vmw_pvscsi: %sabling reqCallThreshold\n", | |
1110 | enable ? "en" : "dis"); | |
1111 | pvscsi_write_cmd_desc(adapter, | |
1112 | PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, | |
1113 | &cmd_msg, sizeof(cmd_msg)); | |
1114 | return pvscsi_reg_read(adapter, | |
1115 | PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; | |
1116 | } | |
1117 | } | |
1118 | ||
851b1642 AK |
1119 | static irqreturn_t pvscsi_isr(int irq, void *devp) |
1120 | { | |
1121 | struct pvscsi_adapter *adapter = devp; | |
1122 | int handled; | |
1123 | ||
1124 | if (adapter->use_msi || adapter->use_msix) | |
1125 | handled = true; | |
1126 | else { | |
1127 | u32 val = pvscsi_read_intr_status(adapter); | |
1128 | handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0; | |
1129 | if (handled) | |
1130 | pvscsi_write_intr_status(devp, val); | |
1131 | } | |
1132 | ||
1133 | if (handled) { | |
1134 | unsigned long flags; | |
1135 | ||
1136 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
1137 | ||
1138 | pvscsi_process_completion_ring(adapter); | |
1139 | if (adapter->use_msg && pvscsi_msg_pending(adapter)) | |
1140 | queue_work(adapter->workqueue, &adapter->work); | |
1141 | ||
1142 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
1143 | } | |
1144 | ||
1145 | return IRQ_RETVAL(handled); | |
1146 | } | |
1147 | ||
1148 | static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) | |
1149 | { | |
1150 | struct pvscsi_ctx *ctx = adapter->cmd_map; | |
1151 | unsigned i; | |
1152 | ||
1153 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) | |
1154 | free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); | |
1155 | } | |
1156 | ||
d0e2ddff DT |
1157 | static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, |
1158 | unsigned int *irq) | |
851b1642 AK |
1159 | { |
1160 | struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION }; | |
1161 | int ret; | |
1162 | ||
1163 | ret = pci_enable_msix(adapter->dev, &entry, 1); | |
1164 | if (ret) | |
1165 | return ret; | |
1166 | ||
1167 | *irq = entry.vector; | |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) | |
1173 | { | |
1174 | if (adapter->irq) { | |
1175 | free_irq(adapter->irq, adapter); | |
1176 | adapter->irq = 0; | |
1177 | } | |
1178 | if (adapter->use_msi) { | |
1179 | pci_disable_msi(adapter->dev); | |
1180 | adapter->use_msi = 0; | |
1181 | } else if (adapter->use_msix) { | |
1182 | pci_disable_msix(adapter->dev); | |
1183 | adapter->use_msix = 0; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | static void pvscsi_release_resources(struct pvscsi_adapter *adapter) | |
1188 | { | |
1189 | pvscsi_shutdown_intr(adapter); | |
1190 | ||
1191 | if (adapter->workqueue) | |
1192 | destroy_workqueue(adapter->workqueue); | |
1193 | ||
1194 | if (adapter->mmioBase) | |
1195 | pci_iounmap(adapter->dev, adapter->mmioBase); | |
1196 | ||
1197 | pci_release_regions(adapter->dev); | |
1198 | ||
1199 | if (adapter->cmd_map) { | |
1200 | pvscsi_free_sgls(adapter); | |
1201 | kfree(adapter->cmd_map); | |
1202 | } | |
1203 | ||
1204 | if (adapter->rings_state) | |
1205 | pci_free_consistent(adapter->dev, PAGE_SIZE, | |
1206 | adapter->rings_state, adapter->ringStatePA); | |
1207 | ||
1208 | if (adapter->req_ring) | |
1209 | pci_free_consistent(adapter->dev, | |
1210 | adapter->req_pages * PAGE_SIZE, | |
1211 | adapter->req_ring, adapter->reqRingPA); | |
1212 | ||
1213 | if (adapter->cmp_ring) | |
1214 | pci_free_consistent(adapter->dev, | |
1215 | adapter->cmp_pages * PAGE_SIZE, | |
1216 | adapter->cmp_ring, adapter->cmpRingPA); | |
1217 | ||
1218 | if (adapter->msg_ring) | |
1219 | pci_free_consistent(adapter->dev, | |
1220 | adapter->msg_pages * PAGE_SIZE, | |
1221 | adapter->msg_ring, adapter->msgRingPA); | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * Allocate scatter gather lists. | |
1226 | * | |
1227 | * These are statically allocated. Trying to be clever was not worth it. | |
1228 | * | |
42b2aa86 | 1229 | * Dynamic allocation can fail, and we can't go deep into the memory |
851b1642 AK |
1230 | * allocator, since we're a SCSI driver, and trying too hard to allocate |
1231 | * memory might generate disk I/O. We also don't want to fail disk I/O | |
1232 | * in that case because we can't get an allocation - the I/O could be | |
1233 | * trying to swap out data to free memory. Since that is pathological, | |
1234 | * just use a statically allocated scatter list. | |
1235 | * | |
1236 | */ | |
6f039790 | 1237 | static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) |
851b1642 AK |
1238 | { |
1239 | struct pvscsi_ctx *ctx; | |
1240 | int i; | |
1241 | ||
1242 | ctx = adapter->cmd_map; | |
1243 | BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); | |
1244 | ||
1245 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) { | |
1246 | ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, | |
1247 | get_order(SGL_SIZE)); | |
1248 | ctx->sglPA = 0; | |
1249 | BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); | |
1250 | if (!ctx->sgl) { | |
1251 | for (; i >= 0; --i, --ctx) { | |
1252 | free_pages((unsigned long)ctx->sgl, | |
1253 | get_order(SGL_SIZE)); | |
1254 | ctx->sgl = NULL; | |
1255 | } | |
1256 | return -ENOMEM; | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
a9310735 AK |
1263 | /* |
1264 | * Query the device, fetch the config info and return the | |
1265 | * maximum number of targets on the adapter. In case of | |
1266 | * failure due to any reason return default i.e. 16. | |
1267 | */ | |
1268 | static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) | |
1269 | { | |
1270 | struct PVSCSICmdDescConfigCmd cmd; | |
1271 | struct PVSCSIConfigPageHeader *header; | |
1272 | struct device *dev; | |
1273 | dma_addr_t configPagePA; | |
1274 | void *config_page; | |
1275 | u32 numPhys = 16; | |
1276 | ||
1277 | dev = pvscsi_dev(adapter); | |
1278 | config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE, | |
1279 | &configPagePA); | |
1280 | if (!config_page) { | |
1281 | dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n"); | |
1282 | goto exit; | |
1283 | } | |
1284 | BUG_ON(configPagePA & ~PAGE_MASK); | |
1285 | ||
1286 | /* Fetch config info from the device. */ | |
1287 | cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; | |
1288 | cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; | |
1289 | cmd.cmpAddr = configPagePA; | |
1290 | cmd._pad = 0; | |
1291 | ||
1292 | /* | |
1293 | * Mark the completion page header with error values. If the device | |
1294 | * completes the command successfully, it sets the status values to | |
1295 | * indicate success. | |
1296 | */ | |
1297 | header = config_page; | |
1298 | memset(header, 0, sizeof *header); | |
1299 | header->hostStatus = BTSTAT_INVPARAM; | |
1300 | header->scsiStatus = SDSTAT_CHECK; | |
1301 | ||
1302 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd); | |
1303 | ||
1304 | if (header->hostStatus == BTSTAT_SUCCESS && | |
1305 | header->scsiStatus == SDSTAT_GOOD) { | |
1306 | struct PVSCSIConfigPageController *config; | |
1307 | ||
1308 | config = config_page; | |
1309 | numPhys = config->numPhys; | |
1310 | } else | |
1311 | dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n", | |
1312 | header->hostStatus, header->scsiStatus); | |
1313 | pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA); | |
1314 | exit: | |
1315 | return numPhys; | |
1316 | } | |
1317 | ||
6f039790 | 1318 | static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
851b1642 AK |
1319 | { |
1320 | struct pvscsi_adapter *adapter; | |
1321 | struct Scsi_Host *host; | |
a9310735 | 1322 | struct device *dev; |
851b1642 AK |
1323 | unsigned int i; |
1324 | unsigned long flags = 0; | |
1325 | int error; | |
1326 | ||
1327 | error = -ENODEV; | |
1328 | ||
1329 | if (pci_enable_device(pdev)) | |
1330 | return error; | |
1331 | ||
1332 | if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 && | |
1333 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) { | |
1334 | printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); | |
1335 | } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 && | |
1336 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) { | |
1337 | printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); | |
1338 | } else { | |
1339 | printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); | |
1340 | goto out_disable_device; | |
1341 | } | |
1342 | ||
1343 | pvscsi_template.can_queue = | |
1344 | min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * | |
1345 | PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; | |
1346 | pvscsi_template.cmd_per_lun = | |
1347 | min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); | |
1348 | host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); | |
1349 | if (!host) { | |
1350 | printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); | |
1351 | goto out_disable_device; | |
1352 | } | |
1353 | ||
1354 | adapter = shost_priv(host); | |
1355 | memset(adapter, 0, sizeof(*adapter)); | |
1356 | adapter->dev = pdev; | |
1357 | adapter->host = host; | |
1358 | ||
1359 | spin_lock_init(&adapter->hw_lock); | |
1360 | ||
1361 | host->max_channel = 0; | |
1362 | host->max_id = 16; | |
1363 | host->max_lun = 1; | |
1364 | host->max_cmd_len = 16; | |
1365 | ||
1366 | adapter->rev = pdev->revision; | |
1367 | ||
1368 | if (pci_request_regions(pdev, "vmw_pvscsi")) { | |
1369 | printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); | |
1370 | goto out_free_host; | |
1371 | } | |
1372 | ||
1373 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
1374 | if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) | |
1375 | continue; | |
1376 | ||
1377 | if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) | |
1378 | continue; | |
1379 | ||
1380 | break; | |
1381 | } | |
1382 | ||
1383 | if (i == DEVICE_COUNT_RESOURCE) { | |
1384 | printk(KERN_ERR | |
1385 | "vmw_pvscsi: adapter has no suitable MMIO region\n"); | |
1386 | goto out_release_resources; | |
1387 | } | |
1388 | ||
1389 | adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); | |
1390 | ||
1391 | if (!adapter->mmioBase) { | |
1392 | printk(KERN_ERR | |
1393 | "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", | |
1394 | i, PVSCSI_MEM_SPACE_SIZE); | |
1395 | goto out_release_resources; | |
1396 | } | |
1397 | ||
1398 | pci_set_master(pdev); | |
1399 | pci_set_drvdata(pdev, host); | |
1400 | ||
1401 | ll_adapter_reset(adapter); | |
1402 | ||
1403 | adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); | |
1404 | ||
1405 | error = pvscsi_allocate_rings(adapter); | |
1406 | if (error) { | |
1407 | printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); | |
1408 | goto out_release_resources; | |
1409 | } | |
1410 | ||
a9310735 AK |
1411 | /* |
1412 | * Ask the device for max number of targets. | |
1413 | */ | |
1414 | host->max_id = pvscsi_get_max_targets(adapter); | |
1415 | dev = pvscsi_dev(adapter); | |
1416 | dev_info(dev, "vmw_pvscsi: host->max_id: %u\n", host->max_id); | |
1417 | ||
851b1642 AK |
1418 | /* |
1419 | * From this point on we should reset the adapter if anything goes | |
1420 | * wrong. | |
1421 | */ | |
1422 | pvscsi_setup_all_rings(adapter); | |
1423 | ||
1424 | adapter->cmd_map = kcalloc(adapter->req_depth, | |
1425 | sizeof(struct pvscsi_ctx), GFP_KERNEL); | |
1426 | if (!adapter->cmd_map) { | |
1427 | printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); | |
1428 | error = -ENOMEM; | |
1429 | goto out_reset_adapter; | |
1430 | } | |
1431 | ||
1432 | INIT_LIST_HEAD(&adapter->cmd_pool); | |
1433 | for (i = 0; i < adapter->req_depth; i++) { | |
1434 | struct pvscsi_ctx *ctx = adapter->cmd_map + i; | |
1435 | list_add(&ctx->list, &adapter->cmd_pool); | |
1436 | } | |
1437 | ||
1438 | error = pvscsi_allocate_sg(adapter); | |
1439 | if (error) { | |
1440 | printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); | |
1441 | goto out_reset_adapter; | |
1442 | } | |
1443 | ||
1444 | if (!pvscsi_disable_msix && | |
1445 | pvscsi_setup_msix(adapter, &adapter->irq) == 0) { | |
1446 | printk(KERN_INFO "vmw_pvscsi: using MSI-X\n"); | |
1447 | adapter->use_msix = 1; | |
1448 | } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) { | |
1449 | printk(KERN_INFO "vmw_pvscsi: using MSI\n"); | |
1450 | adapter->use_msi = 1; | |
1451 | adapter->irq = pdev->irq; | |
1452 | } else { | |
1453 | printk(KERN_INFO "vmw_pvscsi: using INTx\n"); | |
1454 | adapter->irq = pdev->irq; | |
1455 | flags = IRQF_SHARED; | |
1456 | } | |
1457 | ||
2a815b5a RM |
1458 | adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true); |
1459 | printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n", | |
1460 | adapter->use_req_threshold ? "en" : "dis"); | |
1461 | ||
851b1642 AK |
1462 | error = request_irq(adapter->irq, pvscsi_isr, flags, |
1463 | "vmw_pvscsi", adapter); | |
1464 | if (error) { | |
1465 | printk(KERN_ERR | |
1466 | "vmw_pvscsi: unable to request IRQ: %d\n", error); | |
1467 | adapter->irq = 0; | |
1468 | goto out_reset_adapter; | |
1469 | } | |
1470 | ||
1471 | error = scsi_add_host(host, &pdev->dev); | |
1472 | if (error) { | |
1473 | printk(KERN_ERR | |
1474 | "vmw_pvscsi: scsi_add_host failed: %d\n", error); | |
1475 | goto out_reset_adapter; | |
1476 | } | |
1477 | ||
1478 | dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", | |
1479 | adapter->rev, host->host_no); | |
1480 | ||
1481 | pvscsi_unmask_intr(adapter); | |
1482 | ||
1483 | scsi_scan_host(host); | |
1484 | ||
1485 | return 0; | |
1486 | ||
1487 | out_reset_adapter: | |
1488 | ll_adapter_reset(adapter); | |
1489 | out_release_resources: | |
1490 | pvscsi_release_resources(adapter); | |
1491 | out_free_host: | |
1492 | scsi_host_put(host); | |
1493 | out_disable_device: | |
851b1642 AK |
1494 | pci_disable_device(pdev); |
1495 | ||
1496 | return error; | |
1497 | } | |
1498 | ||
1499 | static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) | |
1500 | { | |
1501 | pvscsi_mask_intr(adapter); | |
1502 | ||
1503 | if (adapter->workqueue) | |
1504 | flush_workqueue(adapter->workqueue); | |
1505 | ||
1506 | pvscsi_shutdown_intr(adapter); | |
1507 | ||
1508 | pvscsi_process_request_ring(adapter); | |
1509 | pvscsi_process_completion_ring(adapter); | |
1510 | ll_adapter_reset(adapter); | |
1511 | } | |
1512 | ||
1513 | static void pvscsi_shutdown(struct pci_dev *dev) | |
1514 | { | |
1515 | struct Scsi_Host *host = pci_get_drvdata(dev); | |
1516 | struct pvscsi_adapter *adapter = shost_priv(host); | |
1517 | ||
1518 | __pvscsi_shutdown(adapter); | |
1519 | } | |
1520 | ||
1521 | static void pvscsi_remove(struct pci_dev *pdev) | |
1522 | { | |
1523 | struct Scsi_Host *host = pci_get_drvdata(pdev); | |
1524 | struct pvscsi_adapter *adapter = shost_priv(host); | |
1525 | ||
1526 | scsi_remove_host(host); | |
1527 | ||
1528 | __pvscsi_shutdown(adapter); | |
1529 | pvscsi_release_resources(adapter); | |
1530 | ||
1531 | scsi_host_put(host); | |
1532 | ||
851b1642 AK |
1533 | pci_disable_device(pdev); |
1534 | } | |
1535 | ||
1536 | static struct pci_driver pvscsi_pci_driver = { | |
1537 | .name = "vmw_pvscsi", | |
1538 | .id_table = pvscsi_pci_tbl, | |
1539 | .probe = pvscsi_probe, | |
6f039790 | 1540 | .remove = pvscsi_remove, |
851b1642 AK |
1541 | .shutdown = pvscsi_shutdown, |
1542 | }; | |
1543 | ||
1544 | static int __init pvscsi_init(void) | |
1545 | { | |
1546 | pr_info("%s - version %s\n", | |
1547 | PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); | |
1548 | return pci_register_driver(&pvscsi_pci_driver); | |
1549 | } | |
1550 | ||
1551 | static void __exit pvscsi_exit(void) | |
1552 | { | |
1553 | pci_unregister_driver(&pvscsi_pci_driver); | |
1554 | } | |
1555 | ||
1556 | module_init(pvscsi_init); | |
1557 | module_exit(pvscsi_exit); |