1 | /* |
2 | * Linux driver for VMware's para-virtualized SCSI HBA. |
3 | * |
4 | * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License as published by the |
8 | * Free Software Foundation; version 2 of the License and no later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
13 | * NON INFRINGEMENT. See the GNU General Public License for more |
14 | * details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
19 | * |
20 | */ |
21 | |
22 | #include <linux/kernel.h> |
23 | #include <linux/module.h> |
24 | #include <linux/interrupt.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/workqueue.h> |
27 | #include <linux/pci.h> |
28 | |
29 | #include <scsi/scsi.h> |
30 | #include <scsi/scsi_host.h> |
31 | #include <scsi/scsi_cmnd.h> |
32 | #include <scsi/scsi_device.h> |
33 | #include <scsi/scsi_tcq.h> |
34 | |
35 | #include "vmw_pvscsi.h" |
36 | |
37 | #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" |
38 | |
39 | MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); |
40 | MODULE_AUTHOR("VMware, Inc." ); |
41 | MODULE_LICENSE("GPL" ); |
42 | MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); |
43 | |
44 | #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 |
45 | #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 |
46 | #define PVSCSI_DEFAULT_QUEUE_DEPTH 254 |
47 | #define SGL_SIZE PAGE_SIZE |
48 | |
49 | struct pvscsi_sg_list { |
50 | struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; |
51 | }; |
52 | |
53 | struct pvscsi_ctx { |
54 | /* |
55 | * The index of the context in cmd_map serves as the context ID for a |
56 | * 1-to-1 mapping completions back to requests. |
57 | */ |
58 | struct scsi_cmnd *cmd; |
59 | struct pvscsi_sg_list *sgl; |
60 | struct list_head list; |
61 | dma_addr_t dataPA; |
62 | dma_addr_t sensePA; |
63 | dma_addr_t sglPA; |
64 | struct completion *abort_cmp; |
65 | }; |
66 | |
67 | struct pvscsi_adapter { |
68 | char *mmioBase; |
69 | u8 rev; |
70 | bool use_msg; |
71 | bool use_req_threshold; |
72 | |
73 | spinlock_t hw_lock; |
74 | |
75 | struct workqueue_struct *workqueue; |
76 | struct work_struct work; |
77 | |
78 | struct PVSCSIRingReqDesc *req_ring; |
79 | unsigned req_pages; |
80 | unsigned req_depth; |
81 | dma_addr_t reqRingPA; |
82 | |
83 | struct PVSCSIRingCmpDesc *cmp_ring; |
84 | unsigned cmp_pages; |
85 | dma_addr_t cmpRingPA; |
86 | |
87 | struct PVSCSIRingMsgDesc *msg_ring; |
88 | unsigned msg_pages; |
89 | dma_addr_t msgRingPA; |
90 | |
91 | struct PVSCSIRingsState *rings_state; |
92 | dma_addr_t ringStatePA; |
93 | |
94 | struct pci_dev *dev; |
95 | struct Scsi_Host *host; |
96 | |
97 | struct list_head cmd_pool; |
98 | struct pvscsi_ctx *cmd_map; |
99 | }; |
100 | |
101 | |
102 | /* Command line parameters */ |
103 | static int pvscsi_ring_pages; |
104 | static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; |
105 | static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; |
106 | static bool pvscsi_disable_msi; |
107 | static bool pvscsi_disable_msix; |
108 | static bool pvscsi_use_msg = true; |
109 | static bool pvscsi_use_req_threshold = true; |
110 | |
111 | #define PVSCSI_RW (S_IRUSR | S_IWUSR) |
112 | |
113 | module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); |
114 | MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" |
115 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) |
116 | "[up to 16 targets]," |
117 | __stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) |
118 | "[for 16+ targets])" ); |
119 | |
120 | module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); |
121 | MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" |
122 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")" ); |
123 | |
124 | module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); |
125 | MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" |
126 | __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")" ); |
127 | |
128 | module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); |
129 | MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)" ); |
130 | |
131 | module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); |
132 | MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)" ); |
133 | |
134 | module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); |
135 | MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)" ); |
136 | |
137 | module_param_named(use_req_threshold, pvscsi_use_req_threshold, |
138 | bool, PVSCSI_RW); |
139 | MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)" ); |
140 | |
141 | static const struct pci_device_id pvscsi_pci_tbl[] = { |
142 | { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, |
143 | { 0 } |
144 | }; |
145 | |
146 | MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); |
147 | |
148 | static struct device * |
149 | pvscsi_dev(const struct pvscsi_adapter *adapter) |
150 | { |
151 | return &(adapter->dev->dev); |
152 | } |
153 | |
154 | static struct pvscsi_ctx * |
155 | pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) |
156 | { |
157 | struct pvscsi_ctx *ctx, *end; |
158 | |
159 | end = &adapter->cmd_map[adapter->req_depth]; |
160 | for (ctx = adapter->cmd_map; ctx < end; ctx++) |
161 | if (ctx->cmd == cmd) |
162 | return ctx; |
163 | |
164 | return NULL; |
165 | } |
166 | |
167 | static struct pvscsi_ctx * |
168 | pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) |
169 | { |
170 | struct pvscsi_ctx *ctx; |
171 | |
172 | if (list_empty(head: &adapter->cmd_pool)) |
173 | return NULL; |
174 | |
175 | ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); |
176 | ctx->cmd = cmd; |
177 | list_del(entry: &ctx->list); |
178 | |
179 | return ctx; |
180 | } |
181 | |
182 | static void pvscsi_release_context(struct pvscsi_adapter *adapter, |
183 | struct pvscsi_ctx *ctx) |
184 | { |
185 | ctx->cmd = NULL; |
186 | ctx->abort_cmp = NULL; |
187 | list_add(new: &ctx->list, head: &adapter->cmd_pool); |
188 | } |
189 | |
190 | /* |
191 | * Map a pvscsi_ctx struct to a context ID field value; we map to a simple |
192 | * non-zero integer. ctx always points to an entry in cmd_map array, hence |
193 | * the return value is always >=1. |
194 | */ |
195 | static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, |
196 | const struct pvscsi_ctx *ctx) |
197 | { |
198 | return ctx - adapter->cmd_map + 1; |
199 | } |
200 | |
201 | static struct pvscsi_ctx * |
202 | pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) |
203 | { |
204 | return &adapter->cmd_map[context - 1]; |
205 | } |
206 | |
207 | static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, |
208 | u32 offset, u32 val) |
209 | { |
210 | writel(val, addr: adapter->mmioBase + offset); |
211 | } |
212 | |
213 | static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) |
214 | { |
215 | return readl(addr: adapter->mmioBase + offset); |
216 | } |
217 | |
218 | static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) |
219 | { |
220 | return pvscsi_reg_read(adapter, offset: PVSCSI_REG_OFFSET_INTR_STATUS); |
221 | } |
222 | |
223 | static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, |
224 | u32 val) |
225 | { |
226 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_INTR_STATUS, val); |
227 | } |
228 | |
229 | static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) |
230 | { |
231 | u32 intr_bits; |
232 | |
233 | intr_bits = PVSCSI_INTR_CMPL_MASK; |
234 | if (adapter->use_msg) |
235 | intr_bits |= PVSCSI_INTR_MSG_MASK; |
236 | |
237 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_INTR_MASK, val: intr_bits); |
238 | } |
239 | |
240 | static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) |
241 | { |
242 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_INTR_MASK, val: 0); |
243 | } |
244 | |
245 | static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, |
246 | u32 cmd, const void *desc, size_t len) |
247 | { |
248 | const u32 *ptr = desc; |
249 | size_t i; |
250 | |
251 | len /= sizeof(*ptr); |
252 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_COMMAND, val: cmd); |
253 | for (i = 0; i < len; i++) |
254 | pvscsi_reg_write(adapter, |
255 | offset: PVSCSI_REG_OFFSET_COMMAND_DATA, val: ptr[i]); |
256 | } |
257 | |
258 | static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, |
259 | const struct pvscsi_ctx *ctx) |
260 | { |
261 | struct PVSCSICmdDescAbortCmd cmd = { 0 }; |
262 | |
263 | cmd.target = ctx->cmd->device->id; |
264 | cmd.context = pvscsi_map_context(adapter, ctx); |
265 | |
266 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_ABORT_CMD, desc: &cmd, len: sizeof(cmd)); |
267 | } |
268 | |
269 | static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) |
270 | { |
271 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_KICK_RW_IO, val: 0); |
272 | } |
273 | |
274 | static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) |
275 | { |
276 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_KICK_NON_RW_IO, val: 0); |
277 | } |
278 | |
279 | static int scsi_is_rw(unsigned char op) |
280 | { |
281 | return op == READ_6 || op == WRITE_6 || |
282 | op == READ_10 || op == WRITE_10 || |
283 | op == READ_12 || op == WRITE_12 || |
284 | op == READ_16 || op == WRITE_16; |
285 | } |
286 | |
287 | static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, |
288 | unsigned char op) |
289 | { |
290 | if (scsi_is_rw(op)) { |
291 | struct PVSCSIRingsState *s = adapter->rings_state; |
292 | |
293 | if (!adapter->use_req_threshold || |
294 | s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) |
295 | pvscsi_kick_rw_io(adapter); |
296 | } else { |
297 | pvscsi_process_request_ring(adapter); |
298 | } |
299 | } |
300 | |
301 | static void ll_adapter_reset(const struct pvscsi_adapter *adapter) |
302 | { |
303 | dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n" , adapter); |
304 | |
305 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_ADAPTER_RESET, NULL, len: 0); |
306 | } |
307 | |
308 | static void ll_bus_reset(const struct pvscsi_adapter *adapter) |
309 | { |
310 | dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n" , adapter); |
311 | |
312 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_RESET_BUS, NULL, len: 0); |
313 | } |
314 | |
315 | static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) |
316 | { |
317 | struct PVSCSICmdDescResetDevice cmd = { 0 }; |
318 | |
319 | dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n" , target); |
320 | |
321 | cmd.target = target; |
322 | |
323 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_RESET_DEVICE, |
324 | desc: &cmd, len: sizeof(cmd)); |
325 | } |
326 | |
327 | static void pvscsi_create_sg(struct pvscsi_ctx *ctx, |
328 | struct scatterlist *sg, unsigned count) |
329 | { |
330 | unsigned i; |
331 | struct PVSCSISGElement *sge; |
332 | |
333 | BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); |
334 | |
335 | sge = &ctx->sgl->sge[0]; |
336 | for (i = 0; i < count; i++, sg = sg_next(sg)) { |
337 | sge[i].addr = sg_dma_address(sg); |
338 | sge[i].length = sg_dma_len(sg); |
339 | sge[i].flags = 0; |
340 | } |
341 | } |
342 | |
343 | /* |
344 | * Map all data buffers for a command into PCI space and |
345 | * setup the scatter/gather list if needed. |
346 | */ |
347 | static int pvscsi_map_buffers(struct pvscsi_adapter *adapter, |
348 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, |
349 | struct PVSCSIRingReqDesc *e) |
350 | { |
351 | unsigned count; |
352 | unsigned bufflen = scsi_bufflen(cmd); |
353 | struct scatterlist *sg; |
354 | |
355 | e->dataLen = bufflen; |
356 | e->dataAddr = 0; |
357 | if (bufflen == 0) |
358 | return 0; |
359 | |
360 | sg = scsi_sglist(cmd); |
361 | count = scsi_sg_count(cmd); |
362 | if (count != 0) { |
363 | int segs = scsi_dma_map(cmd); |
364 | |
365 | if (segs == -ENOMEM) { |
366 | scmd_printk(KERN_DEBUG, cmd, |
367 | "vmw_pvscsi: Failed to map cmd sglist for DMA.\n" ); |
368 | return -ENOMEM; |
369 | } else if (segs > 1) { |
370 | pvscsi_create_sg(ctx, sg, count: segs); |
371 | |
372 | e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; |
373 | ctx->sglPA = dma_map_single(&adapter->dev->dev, |
374 | ctx->sgl, SGL_SIZE, DMA_TO_DEVICE); |
375 | if (dma_mapping_error(dev: &adapter->dev->dev, dma_addr: ctx->sglPA)) { |
376 | scmd_printk(KERN_ERR, cmd, |
377 | "vmw_pvscsi: Failed to map ctx sglist for DMA.\n" ); |
378 | scsi_dma_unmap(cmd); |
379 | ctx->sglPA = 0; |
380 | return -ENOMEM; |
381 | } |
382 | e->dataAddr = ctx->sglPA; |
383 | } else |
384 | e->dataAddr = sg_dma_address(sg); |
385 | } else { |
386 | /* |
387 | * In case there is no S/G list, scsi_sglist points |
388 | * directly to the buffer. |
389 | */ |
390 | ctx->dataPA = dma_map_single(&adapter->dev->dev, sg, bufflen, |
391 | cmd->sc_data_direction); |
392 | if (dma_mapping_error(dev: &adapter->dev->dev, dma_addr: ctx->dataPA)) { |
393 | scmd_printk(KERN_DEBUG, cmd, |
394 | "vmw_pvscsi: Failed to map direct data buffer for DMA.\n" ); |
395 | return -ENOMEM; |
396 | } |
397 | e->dataAddr = ctx->dataPA; |
398 | } |
399 | |
400 | return 0; |
401 | } |
402 | |
403 | /* |
404 | * The device incorrectly doesn't clear the first byte of the sense |
405 | * buffer in some cases. We have to do it ourselves. |
406 | * Otherwise we run into trouble when SWIOTLB is forced. |
407 | */ |
408 | static void pvscsi_patch_sense(struct scsi_cmnd *cmd) |
409 | { |
410 | if (cmd->sense_buffer) |
411 | cmd->sense_buffer[0] = 0; |
412 | } |
413 | |
414 | static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, |
415 | struct pvscsi_ctx *ctx) |
416 | { |
417 | struct scsi_cmnd *cmd; |
418 | unsigned bufflen; |
419 | |
420 | cmd = ctx->cmd; |
421 | bufflen = scsi_bufflen(cmd); |
422 | |
423 | if (bufflen != 0) { |
424 | unsigned count = scsi_sg_count(cmd); |
425 | |
426 | if (count != 0) { |
427 | scsi_dma_unmap(cmd); |
428 | if (ctx->sglPA) { |
429 | dma_unmap_single(&adapter->dev->dev, ctx->sglPA, |
430 | SGL_SIZE, DMA_TO_DEVICE); |
431 | ctx->sglPA = 0; |
432 | } |
433 | } else |
434 | dma_unmap_single(&adapter->dev->dev, ctx->dataPA, |
435 | bufflen, cmd->sc_data_direction); |
436 | } |
437 | if (cmd->sense_buffer) |
438 | dma_unmap_single(&adapter->dev->dev, ctx->sensePA, |
439 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
440 | } |
441 | |
442 | static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) |
443 | { |
444 | adapter->rings_state = dma_alloc_coherent(dev: &adapter->dev->dev, PAGE_SIZE, |
445 | dma_handle: &adapter->ringStatePA, GFP_KERNEL); |
446 | if (!adapter->rings_state) |
447 | return -ENOMEM; |
448 | |
449 | adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, |
450 | pvscsi_ring_pages); |
451 | adapter->req_depth = adapter->req_pages |
452 | * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; |
453 | adapter->req_ring = dma_alloc_coherent(dev: &adapter->dev->dev, |
454 | size: adapter->req_pages * PAGE_SIZE, dma_handle: &adapter->reqRingPA, |
455 | GFP_KERNEL); |
456 | if (!adapter->req_ring) |
457 | return -ENOMEM; |
458 | |
459 | adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, |
460 | pvscsi_ring_pages); |
461 | adapter->cmp_ring = dma_alloc_coherent(dev: &adapter->dev->dev, |
462 | size: adapter->cmp_pages * PAGE_SIZE, dma_handle: &adapter->cmpRingPA, |
463 | GFP_KERNEL); |
464 | if (!adapter->cmp_ring) |
465 | return -ENOMEM; |
466 | |
467 | BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); |
468 | BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); |
469 | BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); |
470 | |
471 | if (!adapter->use_msg) |
472 | return 0; |
473 | |
474 | adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, |
475 | pvscsi_msg_ring_pages); |
476 | adapter->msg_ring = dma_alloc_coherent(dev: &adapter->dev->dev, |
477 | size: adapter->msg_pages * PAGE_SIZE, dma_handle: &adapter->msgRingPA, |
478 | GFP_KERNEL); |
479 | if (!adapter->msg_ring) |
480 | return -ENOMEM; |
481 | BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); |
482 | |
483 | return 0; |
484 | } |
485 | |
486 | static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) |
487 | { |
488 | struct PVSCSICmdDescSetupRings cmd = { 0 }; |
489 | dma_addr_t base; |
490 | unsigned i; |
491 | |
492 | cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; |
493 | cmd.reqRingNumPages = adapter->req_pages; |
494 | cmd.cmpRingNumPages = adapter->cmp_pages; |
495 | |
496 | base = adapter->reqRingPA; |
497 | for (i = 0; i < adapter->req_pages; i++) { |
498 | cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; |
499 | base += PAGE_SIZE; |
500 | } |
501 | |
502 | base = adapter->cmpRingPA; |
503 | for (i = 0; i < adapter->cmp_pages; i++) { |
504 | cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; |
505 | base += PAGE_SIZE; |
506 | } |
507 | |
508 | memset(adapter->rings_state, 0, PAGE_SIZE); |
509 | memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); |
510 | memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); |
511 | |
512 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_SETUP_RINGS, |
513 | desc: &cmd, len: sizeof(cmd)); |
514 | |
515 | if (adapter->use_msg) { |
516 | struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; |
517 | |
518 | cmd_msg.numPages = adapter->msg_pages; |
519 | |
520 | base = adapter->msgRingPA; |
521 | for (i = 0; i < adapter->msg_pages; i++) { |
522 | cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; |
523 | base += PAGE_SIZE; |
524 | } |
525 | memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); |
526 | |
527 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_SETUP_MSG_RING, |
528 | desc: &cmd_msg, len: sizeof(cmd_msg)); |
529 | } |
530 | } |
531 | |
532 | static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
533 | { |
534 | if (!sdev->tagged_supported) |
535 | qdepth = 1; |
536 | return scsi_change_queue_depth(sdev, qdepth); |
537 | } |
538 | |
539 | /* |
540 | * Pull a completion descriptor off and pass the completion back |
541 | * to the SCSI mid layer. |
542 | */ |
543 | static void pvscsi_complete_request(struct pvscsi_adapter *adapter, |
544 | const struct PVSCSIRingCmpDesc *e) |
545 | { |
546 | struct pvscsi_ctx *ctx; |
547 | struct scsi_cmnd *cmd; |
548 | struct completion *abort_cmp; |
549 | u32 btstat = e->hostStatus; |
550 | u32 sdstat = e->scsiStatus; |
551 | |
552 | ctx = pvscsi_get_context(adapter, context: e->context); |
553 | cmd = ctx->cmd; |
554 | abort_cmp = ctx->abort_cmp; |
555 | pvscsi_unmap_buffers(adapter, ctx); |
556 | if (sdstat != SAM_STAT_CHECK_CONDITION) |
557 | pvscsi_patch_sense(cmd); |
558 | pvscsi_release_context(adapter, ctx); |
559 | if (abort_cmp) { |
560 | /* |
561 | * The command was requested to be aborted. Just signal that |
562 | * the request completed and swallow the actual cmd completion |
563 | * here. The abort handler will post a completion for this |
564 | * command indicating that it got successfully aborted. |
565 | */ |
566 | complete(abort_cmp); |
567 | return; |
568 | } |
569 | |
570 | cmd->result = 0; |
571 | if (sdstat != SAM_STAT_GOOD && |
572 | (btstat == BTSTAT_SUCCESS || |
573 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED || |
574 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { |
575 | if (sdstat == SAM_STAT_COMMAND_TERMINATED) { |
576 | cmd->result = (DID_RESET << 16); |
577 | } else { |
578 | cmd->result = (DID_OK << 16) | sdstat; |
579 | } |
580 | } else |
581 | switch (btstat) { |
582 | case BTSTAT_SUCCESS: |
583 | case BTSTAT_LINKED_COMMAND_COMPLETED: |
584 | case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: |
585 | /* |
586 | * Commands like INQUIRY may transfer less data than |
587 | * requested by the initiator via bufflen. Set residual |
588 | * count to make upper layer aware of the actual amount |
589 | * of data returned. There are cases when controller |
590 | * returns zero dataLen with non zero data - do not set |
591 | * residual count in that case. |
592 | */ |
593 | if (e->dataLen && (e->dataLen < scsi_bufflen(cmd))) |
594 | scsi_set_resid(cmd, resid: scsi_bufflen(cmd) - e->dataLen); |
595 | cmd->result = (DID_OK << 16); |
596 | break; |
597 | |
598 | case BTSTAT_DATARUN: |
599 | case BTSTAT_DATA_UNDERRUN: |
600 | /* Report residual data in underruns */ |
601 | scsi_set_resid(cmd, resid: scsi_bufflen(cmd) - e->dataLen); |
602 | cmd->result = (DID_ERROR << 16); |
603 | break; |
604 | |
605 | case BTSTAT_SELTIMEO: |
606 | /* Our emulation returns this for non-connected devs */ |
607 | cmd->result = (DID_BAD_TARGET << 16); |
608 | break; |
609 | |
610 | case BTSTAT_LUNMISMATCH: |
611 | case BTSTAT_TAGREJECT: |
612 | case BTSTAT_BADMSG: |
613 | case BTSTAT_HAHARDWARE: |
614 | case BTSTAT_INVPHASE: |
615 | case BTSTAT_HATIMEOUT: |
616 | case BTSTAT_NORESPONSE: |
617 | case BTSTAT_DISCONNECT: |
618 | case BTSTAT_HASOFTWARE: |
619 | case BTSTAT_BUSFREE: |
620 | case BTSTAT_SENSFAILED: |
621 | cmd->result |= (DID_ERROR << 16); |
622 | break; |
623 | |
624 | case BTSTAT_SENTRST: |
625 | case BTSTAT_RECVRST: |
626 | case BTSTAT_BUSRESET: |
627 | cmd->result = (DID_RESET << 16); |
628 | break; |
629 | |
630 | case BTSTAT_ABORTQUEUE: |
631 | cmd->result = (DID_BUS_BUSY << 16); |
632 | break; |
633 | |
634 | case BTSTAT_SCSIPARITY: |
635 | cmd->result = (DID_PARITY << 16); |
636 | break; |
637 | |
638 | default: |
639 | cmd->result = (DID_ERROR << 16); |
640 | scmd_printk(KERN_DEBUG, cmd, |
641 | "Unknown completion status: 0x%x\n" , |
642 | btstat); |
643 | } |
644 | |
645 | dev_dbg(&cmd->device->sdev_gendev, |
646 | "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n" , |
647 | cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); |
648 | |
649 | scsi_done(cmd); |
650 | } |
651 | |
652 | /* |
653 | * barrier usage : Since the PVSCSI device is emulated, there could be cases |
654 | * where we may want to serialize some accesses between the driver and the |
655 | * emulation layer. We use compiler barriers instead of the more expensive |
656 | * memory barriers because PVSCSI is only supported on X86 which has strong |
657 | * memory access ordering. |
658 | */ |
659 | static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) |
660 | { |
661 | struct PVSCSIRingsState *s = adapter->rings_state; |
662 | struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; |
663 | u32 cmp_entries = s->cmpNumEntriesLog2; |
664 | |
665 | while (s->cmpConsIdx != s->cmpProdIdx) { |
666 | struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & |
667 | MASK(cmp_entries)); |
668 | /* |
669 | * This barrier() ensures that *e is not dereferenced while |
670 | * the device emulation still writes data into the slot. |
671 | * Since the device emulation advances s->cmpProdIdx only after |
672 | * updating the slot we want to check it first. |
673 | */ |
674 | barrier(); |
675 | pvscsi_complete_request(adapter, e); |
676 | /* |
677 | * This barrier() ensures that compiler doesn't reorder write |
678 | * to s->cmpConsIdx before the read of (*e) inside |
679 | * pvscsi_complete_request. Otherwise, device emulation may |
680 | * overwrite *e before we had a chance to read it. |
681 | */ |
682 | barrier(); |
683 | s->cmpConsIdx++; |
684 | } |
685 | } |
686 | |
687 | /* |
688 | * Translate a Linux SCSI request into a request ring entry. |
689 | */ |
690 | static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, |
691 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) |
692 | { |
693 | struct PVSCSIRingsState *s; |
694 | struct PVSCSIRingReqDesc *e; |
695 | struct scsi_device *sdev; |
696 | u32 req_entries; |
697 | |
698 | s = adapter->rings_state; |
699 | sdev = cmd->device; |
700 | req_entries = s->reqNumEntriesLog2; |
701 | |
702 | /* |
703 | * If this condition holds, we might have room on the request ring, but |
704 | * we might not have room on the completion ring for the response. |
705 | * However, we have already ruled out this possibility - we would not |
706 | * have successfully allocated a context if it were true, since we only |
707 | * have one context per request entry. Check for it anyway, since it |
708 | * would be a serious bug. |
709 | */ |
710 | if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { |
711 | scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " |
712 | "ring full: reqProdIdx=%d cmpConsIdx=%d\n" , |
713 | s->reqProdIdx, s->cmpConsIdx); |
714 | return -1; |
715 | } |
716 | |
717 | e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); |
718 | |
719 | e->bus = sdev->channel; |
720 | e->target = sdev->id; |
721 | memset(e->lun, 0, sizeof(e->lun)); |
722 | e->lun[1] = sdev->lun; |
723 | |
724 | if (cmd->sense_buffer) { |
725 | ctx->sensePA = dma_map_single(&adapter->dev->dev, |
726 | cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, |
727 | DMA_FROM_DEVICE); |
728 | if (dma_mapping_error(dev: &adapter->dev->dev, dma_addr: ctx->sensePA)) { |
729 | scmd_printk(KERN_DEBUG, cmd, |
730 | "vmw_pvscsi: Failed to map sense buffer for DMA.\n" ); |
731 | ctx->sensePA = 0; |
732 | return -ENOMEM; |
733 | } |
734 | e->senseAddr = ctx->sensePA; |
735 | e->senseLen = SCSI_SENSE_BUFFERSIZE; |
736 | } else { |
737 | e->senseLen = 0; |
738 | e->senseAddr = 0; |
739 | } |
740 | e->cdbLen = cmd->cmd_len; |
741 | e->vcpuHint = smp_processor_id(); |
742 | memcpy(e->cdb, cmd->cmnd, e->cdbLen); |
743 | |
744 | e->tag = SIMPLE_QUEUE_TAG; |
745 | |
746 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) |
747 | e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; |
748 | else if (cmd->sc_data_direction == DMA_TO_DEVICE) |
749 | e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; |
750 | else if (cmd->sc_data_direction == DMA_NONE) |
751 | e->flags = PVSCSI_FLAG_CMD_DIR_NONE; |
752 | else |
753 | e->flags = 0; |
754 | |
755 | if (pvscsi_map_buffers(adapter, ctx, cmd, e) != 0) { |
756 | if (cmd->sense_buffer) { |
757 | dma_unmap_single(&adapter->dev->dev, ctx->sensePA, |
758 | SCSI_SENSE_BUFFERSIZE, |
759 | DMA_FROM_DEVICE); |
760 | ctx->sensePA = 0; |
761 | } |
762 | return -ENOMEM; |
763 | } |
764 | |
765 | e->context = pvscsi_map_context(adapter, ctx); |
766 | |
767 | barrier(); |
768 | |
769 | s->reqProdIdx++; |
770 | |
771 | return 0; |
772 | } |
773 | |
774 | static int pvscsi_queue_lck(struct scsi_cmnd *cmd) |
775 | { |
776 | struct Scsi_Host *host = cmd->device->host; |
777 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
778 | struct pvscsi_ctx *ctx; |
779 | unsigned long flags; |
780 | unsigned char op; |
781 | |
782 | spin_lock_irqsave(&adapter->hw_lock, flags); |
783 | |
784 | ctx = pvscsi_acquire_context(adapter, cmd); |
785 | if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { |
786 | if (ctx) |
787 | pvscsi_release_context(adapter, ctx); |
788 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
789 | return SCSI_MLQUEUE_HOST_BUSY; |
790 | } |
791 | |
792 | op = cmd->cmnd[0]; |
793 | |
794 | dev_dbg(&cmd->device->sdev_gendev, |
795 | "queued cmd %p, ctx %p, op=%x\n" , cmd, ctx, op); |
796 | |
797 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
798 | |
799 | pvscsi_kick_io(adapter, op); |
800 | |
801 | return 0; |
802 | } |
803 | |
804 | static DEF_SCSI_QCMD(pvscsi_queue) |
805 | |
806 | static int pvscsi_abort(struct scsi_cmnd *cmd) |
807 | { |
808 | struct pvscsi_adapter *adapter = shost_priv(shost: cmd->device->host); |
809 | struct pvscsi_ctx *ctx; |
810 | unsigned long flags; |
811 | int result = SUCCESS; |
812 | DECLARE_COMPLETION_ONSTACK(abort_cmp); |
813 | int done; |
814 | |
815 | scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n" , |
816 | adapter->host->host_no, cmd); |
817 | |
818 | spin_lock_irqsave(&adapter->hw_lock, flags); |
819 | |
820 | /* |
821 | * Poll the completion ring first - we might be trying to abort |
822 | * a command that is waiting to be dispatched in the completion ring. |
823 | */ |
824 | pvscsi_process_completion_ring(adapter); |
825 | |
826 | /* |
827 | * If there is no context for the command, it either already succeeded |
828 | * or else was never properly issued. Not our problem. |
829 | */ |
830 | ctx = pvscsi_find_context(adapter, cmd); |
831 | if (!ctx) { |
832 | scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n" , cmd); |
833 | goto out; |
834 | } |
835 | |
836 | /* |
837 | * Mark that the command has been requested to be aborted and issue |
838 | * the abort. |
839 | */ |
840 | ctx->abort_cmp = &abort_cmp; |
841 | |
842 | pvscsi_abort_cmd(adapter, ctx); |
843 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
844 | /* Wait for 2 secs for the completion. */ |
845 | done = wait_for_completion_timeout(x: &abort_cmp, timeout: msecs_to_jiffies(m: 2000)); |
846 | spin_lock_irqsave(&adapter->hw_lock, flags); |
847 | |
848 | if (!done) { |
849 | /* |
850 | * Failed to abort the command, unmark the fact that it |
851 | * was requested to be aborted. |
852 | */ |
853 | ctx->abort_cmp = NULL; |
854 | result = FAILED; |
855 | scmd_printk(KERN_DEBUG, cmd, |
856 | "Failed to get completion for aborted cmd %p\n" , |
857 | cmd); |
858 | goto out; |
859 | } |
860 | |
861 | /* |
862 | * Successfully aborted the command. |
863 | */ |
864 | cmd->result = (DID_ABORT << 16); |
865 | scsi_done(cmd); |
866 | |
867 | out: |
868 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
869 | return result; |
870 | } |
871 | |
872 | /* |
873 | * Abort all outstanding requests. This is only safe to use if the completion |
874 | * ring will never be walked again or the device has been reset, because it |
875 | * destroys the 1-1 mapping between context field passed to emulation and our |
876 | * request structure. |
877 | */ |
878 | static void pvscsi_reset_all(struct pvscsi_adapter *adapter) |
879 | { |
880 | unsigned i; |
881 | |
882 | for (i = 0; i < adapter->req_depth; i++) { |
883 | struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; |
884 | struct scsi_cmnd *cmd = ctx->cmd; |
885 | if (cmd) { |
886 | scmd_printk(KERN_ERR, cmd, |
887 | "Forced reset on cmd %p\n" , cmd); |
888 | pvscsi_unmap_buffers(adapter, ctx); |
889 | pvscsi_patch_sense(cmd); |
890 | pvscsi_release_context(adapter, ctx); |
891 | cmd->result = (DID_RESET << 16); |
892 | scsi_done(cmd); |
893 | } |
894 | } |
895 | } |
896 | |
897 | static int pvscsi_host_reset(struct scsi_cmnd *cmd) |
898 | { |
899 | struct Scsi_Host *host = cmd->device->host; |
900 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
901 | unsigned long flags; |
902 | bool use_msg; |
903 | |
904 | scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n" ); |
905 | |
906 | spin_lock_irqsave(&adapter->hw_lock, flags); |
907 | |
908 | use_msg = adapter->use_msg; |
909 | |
910 | if (use_msg) { |
911 | adapter->use_msg = false; |
912 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
913 | |
914 | /* |
915 | * Now that we know that the ISR won't add more work on the |
916 | * workqueue we can safely flush any outstanding work. |
917 | */ |
918 | flush_workqueue(adapter->workqueue); |
919 | spin_lock_irqsave(&adapter->hw_lock, flags); |
920 | } |
921 | |
922 | /* |
923 | * We're going to tear down the entire ring structure and set it back |
924 | * up, so stalling new requests until all completions are flushed and |
925 | * the rings are back in place. |
926 | */ |
927 | |
928 | pvscsi_process_request_ring(adapter); |
929 | |
930 | ll_adapter_reset(adapter); |
931 | |
932 | /* |
933 | * Now process any completions. Note we do this AFTER adapter reset, |
934 | * which is strange, but stops races where completions get posted |
935 | * between processing the ring and issuing the reset. The backend will |
936 | * not touch the ring memory after reset, so the immediately pre-reset |
937 | * completion ring state is still valid. |
938 | */ |
939 | pvscsi_process_completion_ring(adapter); |
940 | |
941 | pvscsi_reset_all(adapter); |
942 | adapter->use_msg = use_msg; |
943 | pvscsi_setup_all_rings(adapter); |
944 | pvscsi_unmask_intr(adapter); |
945 | |
946 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
947 | |
948 | return SUCCESS; |
949 | } |
950 | |
951 | static int pvscsi_bus_reset(struct scsi_cmnd *cmd) |
952 | { |
953 | struct Scsi_Host *host = cmd->device->host; |
954 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
955 | unsigned long flags; |
956 | |
957 | scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n" ); |
958 | |
959 | /* |
960 | * We don't want to queue new requests for this bus after |
961 | * flushing all pending requests to emulation, since new |
962 | * requests could then sneak in during this bus reset phase, |
963 | * so take the lock now. |
964 | */ |
965 | spin_lock_irqsave(&adapter->hw_lock, flags); |
966 | |
967 | pvscsi_process_request_ring(adapter); |
968 | ll_bus_reset(adapter); |
969 | pvscsi_process_completion_ring(adapter); |
970 | |
971 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
972 | |
973 | return SUCCESS; |
974 | } |
975 | |
976 | static int pvscsi_device_reset(struct scsi_cmnd *cmd) |
977 | { |
978 | struct Scsi_Host *host = cmd->device->host; |
979 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
980 | unsigned long flags; |
981 | |
982 | scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n" , |
983 | host->host_no, cmd->device->id); |
984 | |
985 | /* |
986 | * We don't want to queue new requests for this device after flushing |
987 | * all pending requests to emulation, since new requests could then |
988 | * sneak in during this device reset phase, so take the lock now. |
989 | */ |
990 | spin_lock_irqsave(&adapter->hw_lock, flags); |
991 | |
992 | pvscsi_process_request_ring(adapter); |
993 | ll_device_reset(adapter, target: cmd->device->id); |
994 | pvscsi_process_completion_ring(adapter); |
995 | |
996 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
997 | |
998 | return SUCCESS; |
999 | } |
1000 | |
1001 | static struct scsi_host_template pvscsi_template; |
1002 | |
1003 | static const char *pvscsi_info(struct Scsi_Host *host) |
1004 | { |
1005 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
1006 | static char buf[256]; |
1007 | |
1008 | sprintf(buf, fmt: "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " |
1009 | "%u/%u/%u pages, cmd_per_lun=%u" , adapter->rev, |
1010 | adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, |
1011 | pvscsi_template.cmd_per_lun); |
1012 | |
1013 | return buf; |
1014 | } |
1015 | |
1016 | static struct scsi_host_template pvscsi_template = { |
1017 | .module = THIS_MODULE, |
1018 | .name = "VMware PVSCSI Host Adapter" , |
1019 | .proc_name = "vmw_pvscsi" , |
1020 | .info = pvscsi_info, |
1021 | .queuecommand = pvscsi_queue, |
1022 | .this_id = -1, |
1023 | .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, |
1024 | .dma_boundary = UINT_MAX, |
1025 | .max_sectors = 0xffff, |
1026 | .change_queue_depth = pvscsi_change_queue_depth, |
1027 | .eh_abort_handler = pvscsi_abort, |
1028 | .eh_device_reset_handler = pvscsi_device_reset, |
1029 | .eh_bus_reset_handler = pvscsi_bus_reset, |
1030 | .eh_host_reset_handler = pvscsi_host_reset, |
1031 | }; |
1032 | |
1033 | static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, |
1034 | const struct PVSCSIRingMsgDesc *e) |
1035 | { |
1036 | struct PVSCSIRingsState *s = adapter->rings_state; |
1037 | struct Scsi_Host *host = adapter->host; |
1038 | struct scsi_device *sdev; |
1039 | |
1040 | printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n" , |
1041 | e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); |
1042 | |
1043 | BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); |
1044 | |
1045 | if (e->type == PVSCSI_MSG_DEV_ADDED) { |
1046 | struct PVSCSIMsgDescDevStatusChanged *desc; |
1047 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; |
1048 | |
1049 | printk(KERN_INFO |
1050 | "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n" , |
1051 | desc->bus, desc->target, desc->lun[1]); |
1052 | |
1053 | if (!scsi_host_get(host)) |
1054 | return; |
1055 | |
1056 | sdev = scsi_device_lookup(host, desc->bus, desc->target, |
1057 | desc->lun[1]); |
1058 | if (sdev) { |
1059 | printk(KERN_INFO "vmw_pvscsi: device already exists\n" ); |
1060 | scsi_device_put(sdev); |
1061 | } else |
1062 | scsi_add_device(host: adapter->host, channel: desc->bus, |
1063 | target: desc->target, lun: desc->lun[1]); |
1064 | |
1065 | scsi_host_put(t: host); |
1066 | } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { |
1067 | struct PVSCSIMsgDescDevStatusChanged *desc; |
1068 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; |
1069 | |
1070 | printk(KERN_INFO |
1071 | "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n" , |
1072 | desc->bus, desc->target, desc->lun[1]); |
1073 | |
1074 | if (!scsi_host_get(host)) |
1075 | return; |
1076 | |
1077 | sdev = scsi_device_lookup(host, desc->bus, desc->target, |
1078 | desc->lun[1]); |
1079 | if (sdev) { |
1080 | scsi_remove_device(sdev); |
1081 | scsi_device_put(sdev); |
1082 | } else |
1083 | printk(KERN_INFO |
1084 | "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n" , |
1085 | desc->bus, desc->target, desc->lun[1]); |
1086 | |
1087 | scsi_host_put(t: host); |
1088 | } |
1089 | } |
1090 | |
1091 | static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) |
1092 | { |
1093 | struct PVSCSIRingsState *s = adapter->rings_state; |
1094 | |
1095 | return s->msgProdIdx != s->msgConsIdx; |
1096 | } |
1097 | |
1098 | static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) |
1099 | { |
1100 | struct PVSCSIRingsState *s = adapter->rings_state; |
1101 | struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; |
1102 | u32 msg_entries = s->msgNumEntriesLog2; |
1103 | |
1104 | while (pvscsi_msg_pending(adapter)) { |
1105 | struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & |
1106 | MASK(msg_entries)); |
1107 | |
1108 | barrier(); |
1109 | pvscsi_process_msg(adapter, e); |
1110 | barrier(); |
1111 | s->msgConsIdx++; |
1112 | } |
1113 | } |
1114 | |
1115 | static void pvscsi_msg_workqueue_handler(struct work_struct *data) |
1116 | { |
1117 | struct pvscsi_adapter *adapter; |
1118 | |
1119 | adapter = container_of(data, struct pvscsi_adapter, work); |
1120 | |
1121 | pvscsi_process_msg_ring(adapter); |
1122 | } |
1123 | |
1124 | static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) |
1125 | { |
1126 | char name[32]; |
1127 | |
1128 | if (!pvscsi_use_msg) |
1129 | return 0; |
1130 | |
1131 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_COMMAND, |
1132 | val: PVSCSI_CMD_SETUP_MSG_RING); |
1133 | |
1134 | if (pvscsi_reg_read(adapter, offset: PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) |
1135 | return 0; |
1136 | |
1137 | snprintf(buf: name, size: sizeof(name), |
1138 | fmt: "vmw_pvscsi_wq_%u" , adapter->host->host_no); |
1139 | |
1140 | adapter->workqueue = create_singlethread_workqueue(name); |
1141 | if (!adapter->workqueue) { |
1142 | printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n" ); |
1143 | return 0; |
1144 | } |
1145 | INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); |
1146 | |
1147 | return 1; |
1148 | } |
1149 | |
1150 | static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, |
1151 | bool enable) |
1152 | { |
1153 | u32 val; |
1154 | |
1155 | if (!pvscsi_use_req_threshold) |
1156 | return false; |
1157 | |
1158 | pvscsi_reg_write(adapter, offset: PVSCSI_REG_OFFSET_COMMAND, |
1159 | val: PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); |
1160 | val = pvscsi_reg_read(adapter, offset: PVSCSI_REG_OFFSET_COMMAND_STATUS); |
1161 | if (val == -1) { |
1162 | printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n" ); |
1163 | return false; |
1164 | } else { |
1165 | struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; |
1166 | cmd_msg.enable = enable; |
1167 | printk(KERN_INFO |
1168 | "vmw_pvscsi: %sabling reqCallThreshold\n" , |
1169 | enable ? "en" : "dis" ); |
1170 | pvscsi_write_cmd_desc(adapter, |
1171 | cmd: PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, |
1172 | desc: &cmd_msg, len: sizeof(cmd_msg)); |
1173 | return pvscsi_reg_read(adapter, |
1174 | offset: PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; |
1175 | } |
1176 | } |
1177 | |
1178 | static irqreturn_t pvscsi_isr(int irq, void *devp) |
1179 | { |
1180 | struct pvscsi_adapter *adapter = devp; |
1181 | unsigned long flags; |
1182 | |
1183 | spin_lock_irqsave(&adapter->hw_lock, flags); |
1184 | pvscsi_process_completion_ring(adapter); |
1185 | if (adapter->use_msg && pvscsi_msg_pending(adapter)) |
1186 | queue_work(wq: adapter->workqueue, work: &adapter->work); |
1187 | spin_unlock_irqrestore(lock: &adapter->hw_lock, flags); |
1188 | |
1189 | return IRQ_HANDLED; |
1190 | } |
1191 | |
1192 | static irqreturn_t pvscsi_shared_isr(int irq, void *devp) |
1193 | { |
1194 | struct pvscsi_adapter *adapter = devp; |
1195 | u32 val = pvscsi_read_intr_status(adapter); |
1196 | |
1197 | if (!(val & PVSCSI_INTR_ALL_SUPPORTED)) |
1198 | return IRQ_NONE; |
1199 | pvscsi_write_intr_status(adapter: devp, val); |
1200 | return pvscsi_isr(irq, devp); |
1201 | } |
1202 | |
1203 | static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) |
1204 | { |
1205 | struct pvscsi_ctx *ctx = adapter->cmd_map; |
1206 | unsigned i; |
1207 | |
1208 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) |
1209 | free_pages(addr: (unsigned long)ctx->sgl, order: get_order(SGL_SIZE)); |
1210 | } |
1211 | |
1212 | static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) |
1213 | { |
1214 | free_irq(pci_irq_vector(dev: adapter->dev, nr: 0), adapter); |
1215 | pci_free_irq_vectors(dev: adapter->dev); |
1216 | } |
1217 | |
1218 | static void pvscsi_release_resources(struct pvscsi_adapter *adapter) |
1219 | { |
1220 | if (adapter->workqueue) |
1221 | destroy_workqueue(wq: adapter->workqueue); |
1222 | |
1223 | if (adapter->mmioBase) |
1224 | pci_iounmap(dev: adapter->dev, adapter->mmioBase); |
1225 | |
1226 | pci_release_regions(adapter->dev); |
1227 | |
1228 | if (adapter->cmd_map) { |
1229 | pvscsi_free_sgls(adapter); |
1230 | kfree(objp: adapter->cmd_map); |
1231 | } |
1232 | |
1233 | if (adapter->rings_state) |
1234 | dma_free_coherent(dev: &adapter->dev->dev, PAGE_SIZE, |
1235 | cpu_addr: adapter->rings_state, dma_handle: adapter->ringStatePA); |
1236 | |
1237 | if (adapter->req_ring) |
1238 | dma_free_coherent(dev: &adapter->dev->dev, |
1239 | size: adapter->req_pages * PAGE_SIZE, |
1240 | cpu_addr: adapter->req_ring, dma_handle: adapter->reqRingPA); |
1241 | |
1242 | if (adapter->cmp_ring) |
1243 | dma_free_coherent(dev: &adapter->dev->dev, |
1244 | size: adapter->cmp_pages * PAGE_SIZE, |
1245 | cpu_addr: adapter->cmp_ring, dma_handle: adapter->cmpRingPA); |
1246 | |
1247 | if (adapter->msg_ring) |
1248 | dma_free_coherent(dev: &adapter->dev->dev, |
1249 | size: adapter->msg_pages * PAGE_SIZE, |
1250 | cpu_addr: adapter->msg_ring, dma_handle: adapter->msgRingPA); |
1251 | } |
1252 | |
1253 | /* |
1254 | * Allocate scatter gather lists. |
1255 | * |
1256 | * These are statically allocated. Trying to be clever was not worth it. |
1257 | * |
1258 | * Dynamic allocation can fail, and we can't go deep into the memory |
1259 | * allocator, since we're a SCSI driver, and trying too hard to allocate |
1260 | * memory might generate disk I/O. We also don't want to fail disk I/O |
1261 | * in that case because we can't get an allocation - the I/O could be |
1262 | * trying to swap out data to free memory. Since that is pathological, |
1263 | * just use a statically allocated scatter list. |
1264 | * |
1265 | */ |
1266 | static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) |
1267 | { |
1268 | struct pvscsi_ctx *ctx; |
1269 | int i; |
1270 | |
1271 | ctx = adapter->cmd_map; |
1272 | BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); |
1273 | |
1274 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) { |
1275 | ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, |
1276 | order: get_order(SGL_SIZE)); |
1277 | ctx->sglPA = 0; |
1278 | BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); |
1279 | if (!ctx->sgl) { |
1280 | for (; i >= 0; --i, --ctx) { |
1281 | free_pages(addr: (unsigned long)ctx->sgl, |
1282 | order: get_order(SGL_SIZE)); |
1283 | ctx->sgl = NULL; |
1284 | } |
1285 | return -ENOMEM; |
1286 | } |
1287 | } |
1288 | |
1289 | return 0; |
1290 | } |
1291 | |
1292 | /* |
1293 | * Query the device, fetch the config info and return the |
1294 | * maximum number of targets on the adapter. In case of |
1295 | * failure due to any reason return default i.e. 16. |
1296 | */ |
1297 | static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) |
1298 | { |
1299 | struct PVSCSICmdDescConfigCmd cmd; |
1300 | struct PVSCSIConfigPageHeader *; |
1301 | struct device *dev; |
1302 | dma_addr_t configPagePA; |
1303 | void *config_page; |
1304 | u32 numPhys = 16; |
1305 | |
1306 | dev = pvscsi_dev(adapter); |
1307 | config_page = dma_alloc_coherent(dev: &adapter->dev->dev, PAGE_SIZE, |
1308 | dma_handle: &configPagePA, GFP_KERNEL); |
1309 | if (!config_page) { |
1310 | dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n" ); |
1311 | goto exit; |
1312 | } |
1313 | BUG_ON(configPagePA & ~PAGE_MASK); |
1314 | |
1315 | /* Fetch config info from the device. */ |
1316 | cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; |
1317 | cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; |
1318 | cmd.cmpAddr = configPagePA; |
1319 | cmd._pad = 0; |
1320 | |
1321 | /* |
1322 | * Mark the completion page header with error values. If the device |
1323 | * completes the command successfully, it sets the status values to |
1324 | * indicate success. |
1325 | */ |
1326 | header = config_page; |
1327 | header->hostStatus = BTSTAT_INVPARAM; |
1328 | header->scsiStatus = SDSTAT_CHECK; |
1329 | |
1330 | pvscsi_write_cmd_desc(adapter, cmd: PVSCSI_CMD_CONFIG, desc: &cmd, len: sizeof cmd); |
1331 | |
1332 | if (header->hostStatus == BTSTAT_SUCCESS && |
1333 | header->scsiStatus == SDSTAT_GOOD) { |
1334 | struct PVSCSIConfigPageController *config; |
1335 | |
1336 | config = config_page; |
1337 | numPhys = config->numPhys; |
1338 | } else |
1339 | dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n" , |
1340 | header->hostStatus, header->scsiStatus); |
1341 | dma_free_coherent(dev: &adapter->dev->dev, PAGE_SIZE, cpu_addr: config_page, |
1342 | dma_handle: configPagePA); |
1343 | exit: |
1344 | return numPhys; |
1345 | } |
1346 | |
1347 | static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
1348 | { |
1349 | unsigned int irq_flag = PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY; |
1350 | struct pvscsi_adapter *adapter; |
1351 | struct pvscsi_adapter adapter_temp; |
1352 | struct Scsi_Host *host = NULL; |
1353 | unsigned int i; |
1354 | int error; |
1355 | u32 max_id; |
1356 | |
1357 | error = -ENODEV; |
1358 | |
1359 | if (pci_enable_device(dev: pdev)) |
1360 | return error; |
1361 | |
1362 | if (!dma_set_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(64))) { |
1363 | printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n" ); |
1364 | } else if (!dma_set_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(32))) { |
1365 | printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n" ); |
1366 | } else { |
1367 | printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n" ); |
1368 | goto out_disable_device; |
1369 | } |
1370 | |
1371 | /* |
1372 | * Let's use a temp pvscsi_adapter struct until we find the number of |
1373 | * targets on the adapter, after that we will switch to the real |
1374 | * allocated struct. |
1375 | */ |
1376 | adapter = &adapter_temp; |
1377 | memset(adapter, 0, sizeof(*adapter)); |
1378 | adapter->dev = pdev; |
1379 | adapter->rev = pdev->revision; |
1380 | |
1381 | if (pci_request_regions(pdev, "vmw_pvscsi" )) { |
1382 | printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n" ); |
1383 | goto out_disable_device; |
1384 | } |
1385 | |
1386 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
1387 | if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) |
1388 | continue; |
1389 | |
1390 | if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) |
1391 | continue; |
1392 | |
1393 | break; |
1394 | } |
1395 | |
1396 | if (i == DEVICE_COUNT_RESOURCE) { |
1397 | printk(KERN_ERR |
1398 | "vmw_pvscsi: adapter has no suitable MMIO region\n" ); |
1399 | goto out_release_resources_and_disable; |
1400 | } |
1401 | |
1402 | adapter->mmioBase = pci_iomap(dev: pdev, bar: i, PVSCSI_MEM_SPACE_SIZE); |
1403 | |
1404 | if (!adapter->mmioBase) { |
1405 | printk(KERN_ERR |
1406 | "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n" , |
1407 | i, PVSCSI_MEM_SPACE_SIZE); |
1408 | goto out_release_resources_and_disable; |
1409 | } |
1410 | |
1411 | pci_set_master(dev: pdev); |
1412 | |
1413 | /* |
1414 | * Ask the device for max number of targets before deciding the |
1415 | * default pvscsi_ring_pages value. |
1416 | */ |
1417 | max_id = pvscsi_get_max_targets(adapter); |
1418 | printk(KERN_INFO "vmw_pvscsi: max_id: %u\n" , max_id); |
1419 | |
1420 | if (pvscsi_ring_pages == 0) |
1421 | /* |
1422 | * Set the right default value. Up to 16 it is 8, above it is |
1423 | * max. |
1424 | */ |
1425 | pvscsi_ring_pages = (max_id > 16) ? |
1426 | PVSCSI_SETUP_RINGS_MAX_NUM_PAGES : |
1427 | PVSCSI_DEFAULT_NUM_PAGES_PER_RING; |
1428 | printk(KERN_INFO |
1429 | "vmw_pvscsi: setting ring_pages to %d\n" , |
1430 | pvscsi_ring_pages); |
1431 | |
1432 | pvscsi_template.can_queue = |
1433 | min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * |
1434 | PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; |
1435 | pvscsi_template.cmd_per_lun = |
1436 | min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); |
1437 | host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); |
1438 | if (!host) { |
1439 | printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n" ); |
1440 | goto out_release_resources_and_disable; |
1441 | } |
1442 | |
1443 | /* |
1444 | * Let's use the real pvscsi_adapter struct here onwards. |
1445 | */ |
1446 | adapter = shost_priv(shost: host); |
1447 | memset(adapter, 0, sizeof(*adapter)); |
1448 | adapter->dev = pdev; |
1449 | adapter->host = host; |
1450 | /* |
1451 | * Copy back what we already have to the allocated adapter struct. |
1452 | */ |
1453 | adapter->rev = adapter_temp.rev; |
1454 | adapter->mmioBase = adapter_temp.mmioBase; |
1455 | |
1456 | spin_lock_init(&adapter->hw_lock); |
1457 | host->max_channel = 0; |
1458 | host->max_lun = 1; |
1459 | host->max_cmd_len = 16; |
1460 | host->max_id = max_id; |
1461 | |
1462 | pci_set_drvdata(pdev, data: host); |
1463 | |
1464 | ll_adapter_reset(adapter); |
1465 | |
1466 | adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); |
1467 | |
1468 | error = pvscsi_allocate_rings(adapter); |
1469 | if (error) { |
1470 | printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n" ); |
1471 | goto out_release_resources; |
1472 | } |
1473 | |
1474 | /* |
1475 | * From this point on we should reset the adapter if anything goes |
1476 | * wrong. |
1477 | */ |
1478 | pvscsi_setup_all_rings(adapter); |
1479 | |
1480 | adapter->cmd_map = kcalloc(n: adapter->req_depth, |
1481 | size: sizeof(struct pvscsi_ctx), GFP_KERNEL); |
1482 | if (!adapter->cmd_map) { |
1483 | printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n" ); |
1484 | error = -ENOMEM; |
1485 | goto out_reset_adapter; |
1486 | } |
1487 | |
1488 | INIT_LIST_HEAD(list: &adapter->cmd_pool); |
1489 | for (i = 0; i < adapter->req_depth; i++) { |
1490 | struct pvscsi_ctx *ctx = adapter->cmd_map + i; |
1491 | list_add(new: &ctx->list, head: &adapter->cmd_pool); |
1492 | } |
1493 | |
1494 | error = pvscsi_allocate_sg(adapter); |
1495 | if (error) { |
1496 | printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n" ); |
1497 | goto out_reset_adapter; |
1498 | } |
1499 | |
1500 | if (pvscsi_disable_msix) |
1501 | irq_flag &= ~PCI_IRQ_MSIX; |
1502 | if (pvscsi_disable_msi) |
1503 | irq_flag &= ~PCI_IRQ_MSI; |
1504 | |
1505 | error = pci_alloc_irq_vectors(dev: adapter->dev, min_vecs: 1, max_vecs: 1, flags: irq_flag); |
1506 | if (error < 0) |
1507 | goto out_reset_adapter; |
1508 | |
1509 | adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, enable: true); |
1510 | printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n" , |
1511 | adapter->use_req_threshold ? "en" : "dis" ); |
1512 | |
1513 | if (adapter->dev->msix_enabled || adapter->dev->msi_enabled) { |
1514 | printk(KERN_INFO "vmw_pvscsi: using MSI%s\n" , |
1515 | adapter->dev->msix_enabled ? "-X" : "" ); |
1516 | error = request_irq(irq: pci_irq_vector(dev: pdev, nr: 0), handler: pvscsi_isr, |
1517 | flags: 0, name: "vmw_pvscsi" , dev: adapter); |
1518 | } else { |
1519 | printk(KERN_INFO "vmw_pvscsi: using INTx\n" ); |
1520 | error = request_irq(irq: pci_irq_vector(dev: pdev, nr: 0), handler: pvscsi_shared_isr, |
1521 | IRQF_SHARED, name: "vmw_pvscsi" , dev: adapter); |
1522 | } |
1523 | |
1524 | if (error) { |
1525 | printk(KERN_ERR |
1526 | "vmw_pvscsi: unable to request IRQ: %d\n" , error); |
1527 | goto out_reset_adapter; |
1528 | } |
1529 | |
1530 | error = scsi_add_host(host, dev: &pdev->dev); |
1531 | if (error) { |
1532 | printk(KERN_ERR |
1533 | "vmw_pvscsi: scsi_add_host failed: %d\n" , error); |
1534 | goto out_reset_adapter; |
1535 | } |
1536 | |
1537 | dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n" , |
1538 | adapter->rev, host->host_no); |
1539 | |
1540 | pvscsi_unmask_intr(adapter); |
1541 | |
1542 | scsi_scan_host(host); |
1543 | |
1544 | return 0; |
1545 | |
1546 | out_reset_adapter: |
1547 | ll_adapter_reset(adapter); |
1548 | out_release_resources: |
1549 | pvscsi_shutdown_intr(adapter); |
1550 | pvscsi_release_resources(adapter); |
1551 | scsi_host_put(t: host); |
1552 | out_disable_device: |
1553 | pci_disable_device(dev: pdev); |
1554 | |
1555 | return error; |
1556 | |
1557 | out_release_resources_and_disable: |
1558 | pvscsi_shutdown_intr(adapter); |
1559 | pvscsi_release_resources(adapter); |
1560 | goto out_disable_device; |
1561 | } |
1562 | |
1563 | static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) |
1564 | { |
1565 | pvscsi_mask_intr(adapter); |
1566 | |
1567 | if (adapter->workqueue) |
1568 | flush_workqueue(adapter->workqueue); |
1569 | |
1570 | pvscsi_shutdown_intr(adapter); |
1571 | |
1572 | pvscsi_process_request_ring(adapter); |
1573 | pvscsi_process_completion_ring(adapter); |
1574 | ll_adapter_reset(adapter); |
1575 | } |
1576 | |
1577 | static void pvscsi_shutdown(struct pci_dev *dev) |
1578 | { |
1579 | struct Scsi_Host *host = pci_get_drvdata(pdev: dev); |
1580 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
1581 | |
1582 | __pvscsi_shutdown(adapter); |
1583 | } |
1584 | |
1585 | static void pvscsi_remove(struct pci_dev *pdev) |
1586 | { |
1587 | struct Scsi_Host *host = pci_get_drvdata(pdev); |
1588 | struct pvscsi_adapter *adapter = shost_priv(shost: host); |
1589 | |
1590 | scsi_remove_host(host); |
1591 | |
1592 | __pvscsi_shutdown(adapter); |
1593 | pvscsi_release_resources(adapter); |
1594 | |
1595 | scsi_host_put(t: host); |
1596 | |
1597 | pci_disable_device(dev: pdev); |
1598 | } |
1599 | |
1600 | static struct pci_driver pvscsi_pci_driver = { |
1601 | .name = "vmw_pvscsi" , |
1602 | .id_table = pvscsi_pci_tbl, |
1603 | .probe = pvscsi_probe, |
1604 | .remove = pvscsi_remove, |
1605 | .shutdown = pvscsi_shutdown, |
1606 | }; |
1607 | |
1608 | static int __init pvscsi_init(void) |
1609 | { |
1610 | pr_info("%s - version %s\n" , |
1611 | PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); |
1612 | return pci_register_driver(&pvscsi_pci_driver); |
1613 | } |
1614 | |
1615 | static void __exit pvscsi_exit(void) |
1616 | { |
1617 | pci_unregister_driver(dev: &pvscsi_pci_driver); |
1618 | } |
1619 | |
1620 | module_init(pvscsi_init); |
1621 | module_exit(pvscsi_exit); |
1622 | |