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851b1642 AK |
1 | /* |
2 | * Linux driver for VMware's para-virtualized SCSI HBA. | |
3 | * | |
a2713cce | 4 | * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved. |
851b1642 AK |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; version 2 of the License and no later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
13 | * NON INFRINGEMENT. See the GNU General Public License for more | |
14 | * details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | * | |
a9310735 | 20 | * Maintained by: Arvind Kumar <arvindkumar@vmware.com> |
851b1642 AK |
21 | * |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/interrupt.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
851b1642 AK |
28 | #include <linux/workqueue.h> |
29 | #include <linux/pci.h> | |
30 | ||
31 | #include <scsi/scsi.h> | |
32 | #include <scsi/scsi_host.h> | |
33 | #include <scsi/scsi_cmnd.h> | |
34 | #include <scsi/scsi_device.h> | |
02845560 | 35 | #include <scsi/scsi_tcq.h> |
851b1642 AK |
36 | |
37 | #include "vmw_pvscsi.h" | |
38 | ||
39 | #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" | |
40 | ||
41 | MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); | |
42 | MODULE_AUTHOR("VMware, Inc."); | |
43 | MODULE_LICENSE("GPL"); | |
44 | MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); | |
45 | ||
46 | #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 | |
47 | #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 | |
02845560 | 48 | #define PVSCSI_DEFAULT_QUEUE_DEPTH 254 |
851b1642 AK |
49 | #define SGL_SIZE PAGE_SIZE |
50 | ||
51 | struct pvscsi_sg_list { | |
52 | struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; | |
53 | }; | |
54 | ||
55 | struct pvscsi_ctx { | |
56 | /* | |
57 | * The index of the context in cmd_map serves as the context ID for a | |
58 | * 1-to-1 mapping completions back to requests. | |
59 | */ | |
60 | struct scsi_cmnd *cmd; | |
61 | struct pvscsi_sg_list *sgl; | |
62 | struct list_head list; | |
63 | dma_addr_t dataPA; | |
64 | dma_addr_t sensePA; | |
65 | dma_addr_t sglPA; | |
a2713cce | 66 | struct completion *abort_cmp; |
851b1642 AK |
67 | }; |
68 | ||
69 | struct pvscsi_adapter { | |
70 | char *mmioBase; | |
71 | unsigned int irq; | |
72 | u8 rev; | |
73 | bool use_msi; | |
74 | bool use_msix; | |
75 | bool use_msg; | |
2a815b5a | 76 | bool use_req_threshold; |
851b1642 AK |
77 | |
78 | spinlock_t hw_lock; | |
79 | ||
80 | struct workqueue_struct *workqueue; | |
81 | struct work_struct work; | |
82 | ||
83 | struct PVSCSIRingReqDesc *req_ring; | |
84 | unsigned req_pages; | |
85 | unsigned req_depth; | |
86 | dma_addr_t reqRingPA; | |
87 | ||
88 | struct PVSCSIRingCmpDesc *cmp_ring; | |
89 | unsigned cmp_pages; | |
90 | dma_addr_t cmpRingPA; | |
91 | ||
92 | struct PVSCSIRingMsgDesc *msg_ring; | |
93 | unsigned msg_pages; | |
94 | dma_addr_t msgRingPA; | |
95 | ||
96 | struct PVSCSIRingsState *rings_state; | |
97 | dma_addr_t ringStatePA; | |
98 | ||
99 | struct pci_dev *dev; | |
100 | struct Scsi_Host *host; | |
101 | ||
102 | struct list_head cmd_pool; | |
103 | struct pvscsi_ctx *cmd_map; | |
104 | }; | |
105 | ||
106 | ||
107 | /* Command line parameters */ | |
02845560 | 108 | static int pvscsi_ring_pages; |
851b1642 AK |
109 | static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; |
110 | static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; | |
111 | static bool pvscsi_disable_msi; | |
112 | static bool pvscsi_disable_msix; | |
113 | static bool pvscsi_use_msg = true; | |
2a815b5a | 114 | static bool pvscsi_use_req_threshold = true; |
851b1642 AK |
115 | |
116 | #define PVSCSI_RW (S_IRUSR | S_IWUSR) | |
117 | ||
118 | module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); | |
119 | MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" | |
02845560 AK |
120 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) |
121 | "[up to 16 targets]," | |
122 | __stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) | |
123 | "[for 16+ targets])"); | |
851b1642 AK |
124 | |
125 | module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); | |
126 | MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" | |
127 | __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); | |
128 | ||
129 | module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); | |
130 | MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" | |
02845560 | 131 | __stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")"); |
851b1642 AK |
132 | |
133 | module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); | |
134 | MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); | |
135 | ||
136 | module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); | |
137 | MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); | |
138 | ||
139 | module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); | |
140 | MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); | |
141 | ||
2a815b5a RM |
142 | module_param_named(use_req_threshold, pvscsi_use_req_threshold, |
143 | bool, PVSCSI_RW); | |
144 | MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)"); | |
145 | ||
851b1642 AK |
146 | static const struct pci_device_id pvscsi_pci_tbl[] = { |
147 | { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, | |
148 | { 0 } | |
149 | }; | |
150 | ||
151 | MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); | |
152 | ||
153 | static struct device * | |
154 | pvscsi_dev(const struct pvscsi_adapter *adapter) | |
155 | { | |
156 | return &(adapter->dev->dev); | |
157 | } | |
158 | ||
159 | static struct pvscsi_ctx * | |
160 | pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) | |
161 | { | |
162 | struct pvscsi_ctx *ctx, *end; | |
163 | ||
164 | end = &adapter->cmd_map[adapter->req_depth]; | |
165 | for (ctx = adapter->cmd_map; ctx < end; ctx++) | |
166 | if (ctx->cmd == cmd) | |
167 | return ctx; | |
168 | ||
169 | return NULL; | |
170 | } | |
171 | ||
172 | static struct pvscsi_ctx * | |
173 | pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) | |
174 | { | |
175 | struct pvscsi_ctx *ctx; | |
176 | ||
177 | if (list_empty(&adapter->cmd_pool)) | |
178 | return NULL; | |
179 | ||
180 | ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); | |
181 | ctx->cmd = cmd; | |
182 | list_del(&ctx->list); | |
183 | ||
184 | return ctx; | |
185 | } | |
186 | ||
187 | static void pvscsi_release_context(struct pvscsi_adapter *adapter, | |
188 | struct pvscsi_ctx *ctx) | |
189 | { | |
190 | ctx->cmd = NULL; | |
a2713cce | 191 | ctx->abort_cmp = NULL; |
851b1642 AK |
192 | list_add(&ctx->list, &adapter->cmd_pool); |
193 | } | |
194 | ||
195 | /* | |
196 | * Map a pvscsi_ctx struct to a context ID field value; we map to a simple | |
197 | * non-zero integer. ctx always points to an entry in cmd_map array, hence | |
198 | * the return value is always >=1. | |
199 | */ | |
200 | static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, | |
201 | const struct pvscsi_ctx *ctx) | |
202 | { | |
203 | return ctx - adapter->cmd_map + 1; | |
204 | } | |
205 | ||
206 | static struct pvscsi_ctx * | |
207 | pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) | |
208 | { | |
209 | return &adapter->cmd_map[context - 1]; | |
210 | } | |
211 | ||
212 | static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, | |
213 | u32 offset, u32 val) | |
214 | { | |
215 | writel(val, adapter->mmioBase + offset); | |
216 | } | |
217 | ||
218 | static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) | |
219 | { | |
220 | return readl(adapter->mmioBase + offset); | |
221 | } | |
222 | ||
223 | static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) | |
224 | { | |
225 | return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); | |
226 | } | |
227 | ||
228 | static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, | |
229 | u32 val) | |
230 | { | |
231 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); | |
232 | } | |
233 | ||
234 | static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) | |
235 | { | |
236 | u32 intr_bits; | |
237 | ||
238 | intr_bits = PVSCSI_INTR_CMPL_MASK; | |
239 | if (adapter->use_msg) | |
240 | intr_bits |= PVSCSI_INTR_MSG_MASK; | |
241 | ||
242 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); | |
243 | } | |
244 | ||
245 | static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) | |
246 | { | |
247 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); | |
248 | } | |
249 | ||
250 | static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, | |
251 | u32 cmd, const void *desc, size_t len) | |
252 | { | |
253 | const u32 *ptr = desc; | |
254 | size_t i; | |
255 | ||
256 | len /= sizeof(*ptr); | |
257 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); | |
258 | for (i = 0; i < len; i++) | |
259 | pvscsi_reg_write(adapter, | |
260 | PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); | |
261 | } | |
262 | ||
263 | static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, | |
264 | const struct pvscsi_ctx *ctx) | |
265 | { | |
266 | struct PVSCSICmdDescAbortCmd cmd = { 0 }; | |
267 | ||
268 | cmd.target = ctx->cmd->device->id; | |
269 | cmd.context = pvscsi_map_context(adapter, ctx); | |
270 | ||
271 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); | |
272 | } | |
273 | ||
274 | static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) | |
275 | { | |
276 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); | |
277 | } | |
278 | ||
279 | static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) | |
280 | { | |
281 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); | |
282 | } | |
283 | ||
284 | static int scsi_is_rw(unsigned char op) | |
285 | { | |
286 | return op == READ_6 || op == WRITE_6 || | |
287 | op == READ_10 || op == WRITE_10 || | |
288 | op == READ_12 || op == WRITE_12 || | |
289 | op == READ_16 || op == WRITE_16; | |
290 | } | |
291 | ||
292 | static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, | |
293 | unsigned char op) | |
294 | { | |
2a815b5a RM |
295 | if (scsi_is_rw(op)) { |
296 | struct PVSCSIRingsState *s = adapter->rings_state; | |
297 | ||
298 | if (!adapter->use_req_threshold || | |
299 | s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) | |
300 | pvscsi_kick_rw_io(adapter); | |
301 | } else { | |
851b1642 | 302 | pvscsi_process_request_ring(adapter); |
2a815b5a | 303 | } |
851b1642 AK |
304 | } |
305 | ||
306 | static void ll_adapter_reset(const struct pvscsi_adapter *adapter) | |
307 | { | |
308 | dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); | |
309 | ||
310 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); | |
311 | } | |
312 | ||
313 | static void ll_bus_reset(const struct pvscsi_adapter *adapter) | |
314 | { | |
59e13d48 | 315 | dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter); |
851b1642 AK |
316 | |
317 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); | |
318 | } | |
319 | ||
320 | static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) | |
321 | { | |
322 | struct PVSCSICmdDescResetDevice cmd = { 0 }; | |
323 | ||
59e13d48 | 324 | dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target); |
851b1642 AK |
325 | |
326 | cmd.target = target; | |
327 | ||
328 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, | |
329 | &cmd, sizeof(cmd)); | |
330 | } | |
331 | ||
332 | static void pvscsi_create_sg(struct pvscsi_ctx *ctx, | |
333 | struct scatterlist *sg, unsigned count) | |
334 | { | |
335 | unsigned i; | |
336 | struct PVSCSISGElement *sge; | |
337 | ||
338 | BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); | |
339 | ||
340 | sge = &ctx->sgl->sge[0]; | |
341 | for (i = 0; i < count; i++, sg++) { | |
342 | sge[i].addr = sg_dma_address(sg); | |
343 | sge[i].length = sg_dma_len(sg); | |
344 | sge[i].flags = 0; | |
345 | } | |
346 | } | |
347 | ||
348 | /* | |
349 | * Map all data buffers for a command into PCI space and | |
350 | * setup the scatter/gather list if needed. | |
351 | */ | |
c965853a JB |
352 | static int pvscsi_map_buffers(struct pvscsi_adapter *adapter, |
353 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, | |
354 | struct PVSCSIRingReqDesc *e) | |
851b1642 AK |
355 | { |
356 | unsigned count; | |
357 | unsigned bufflen = scsi_bufflen(cmd); | |
358 | struct scatterlist *sg; | |
359 | ||
360 | e->dataLen = bufflen; | |
361 | e->dataAddr = 0; | |
362 | if (bufflen == 0) | |
c965853a | 363 | return 0; |
851b1642 AK |
364 | |
365 | sg = scsi_sglist(cmd); | |
366 | count = scsi_sg_count(cmd); | |
367 | if (count != 0) { | |
368 | int segs = scsi_dma_map(cmd); | |
c965853a JB |
369 | |
370 | if (segs == -ENOMEM) { | |
371 | scmd_printk(KERN_ERR, cmd, | |
372 | "vmw_pvscsi: Failed to map cmd sglist for DMA.\n"); | |
373 | return -ENOMEM; | |
374 | } else if (segs > 1) { | |
851b1642 AK |
375 | pvscsi_create_sg(ctx, sg, segs); |
376 | ||
377 | e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; | |
378 | ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl, | |
379 | SGL_SIZE, PCI_DMA_TODEVICE); | |
c965853a JB |
380 | if (pci_dma_mapping_error(adapter->dev, ctx->sglPA)) { |
381 | scmd_printk(KERN_ERR, cmd, | |
382 | "vmw_pvscsi: Failed to map ctx sglist for DMA.\n"); | |
383 | scsi_dma_unmap(cmd); | |
384 | ctx->sglPA = 0; | |
385 | return -ENOMEM; | |
386 | } | |
851b1642 AK |
387 | e->dataAddr = ctx->sglPA; |
388 | } else | |
389 | e->dataAddr = sg_dma_address(sg); | |
390 | } else { | |
391 | /* | |
392 | * In case there is no S/G list, scsi_sglist points | |
393 | * directly to the buffer. | |
394 | */ | |
395 | ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen, | |
396 | cmd->sc_data_direction); | |
c965853a JB |
397 | if (pci_dma_mapping_error(adapter->dev, ctx->dataPA)) { |
398 | scmd_printk(KERN_ERR, cmd, | |
399 | "vmw_pvscsi: Failed to map direct data buffer for DMA.\n"); | |
400 | return -ENOMEM; | |
401 | } | |
851b1642 AK |
402 | e->dataAddr = ctx->dataPA; |
403 | } | |
c965853a JB |
404 | |
405 | return 0; | |
851b1642 AK |
406 | } |
407 | ||
408 | static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, | |
409 | struct pvscsi_ctx *ctx) | |
410 | { | |
411 | struct scsi_cmnd *cmd; | |
412 | unsigned bufflen; | |
413 | ||
414 | cmd = ctx->cmd; | |
415 | bufflen = scsi_bufflen(cmd); | |
416 | ||
417 | if (bufflen != 0) { | |
418 | unsigned count = scsi_sg_count(cmd); | |
419 | ||
420 | if (count != 0) { | |
421 | scsi_dma_unmap(cmd); | |
422 | if (ctx->sglPA) { | |
423 | pci_unmap_single(adapter->dev, ctx->sglPA, | |
424 | SGL_SIZE, PCI_DMA_TODEVICE); | |
425 | ctx->sglPA = 0; | |
426 | } | |
427 | } else | |
428 | pci_unmap_single(adapter->dev, ctx->dataPA, bufflen, | |
429 | cmd->sc_data_direction); | |
430 | } | |
431 | if (cmd->sense_buffer) | |
432 | pci_unmap_single(adapter->dev, ctx->sensePA, | |
433 | SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); | |
434 | } | |
435 | ||
6f039790 | 436 | static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter) |
851b1642 AK |
437 | { |
438 | adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE, | |
439 | &adapter->ringStatePA); | |
440 | if (!adapter->rings_state) | |
441 | return -ENOMEM; | |
442 | ||
443 | adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, | |
444 | pvscsi_ring_pages); | |
445 | adapter->req_depth = adapter->req_pages | |
446 | * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; | |
447 | adapter->req_ring = pci_alloc_consistent(adapter->dev, | |
448 | adapter->req_pages * PAGE_SIZE, | |
449 | &adapter->reqRingPA); | |
450 | if (!adapter->req_ring) | |
451 | return -ENOMEM; | |
452 | ||
453 | adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, | |
454 | pvscsi_ring_pages); | |
455 | adapter->cmp_ring = pci_alloc_consistent(adapter->dev, | |
456 | adapter->cmp_pages * PAGE_SIZE, | |
457 | &adapter->cmpRingPA); | |
458 | if (!adapter->cmp_ring) | |
459 | return -ENOMEM; | |
460 | ||
461 | BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); | |
462 | BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); | |
463 | BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); | |
464 | ||
465 | if (!adapter->use_msg) | |
466 | return 0; | |
467 | ||
468 | adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, | |
469 | pvscsi_msg_ring_pages); | |
470 | adapter->msg_ring = pci_alloc_consistent(adapter->dev, | |
471 | adapter->msg_pages * PAGE_SIZE, | |
472 | &adapter->msgRingPA); | |
473 | if (!adapter->msg_ring) | |
474 | return -ENOMEM; | |
475 | BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) | |
481 | { | |
482 | struct PVSCSICmdDescSetupRings cmd = { 0 }; | |
483 | dma_addr_t base; | |
484 | unsigned i; | |
485 | ||
486 | cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; | |
487 | cmd.reqRingNumPages = adapter->req_pages; | |
488 | cmd.cmpRingNumPages = adapter->cmp_pages; | |
489 | ||
490 | base = adapter->reqRingPA; | |
491 | for (i = 0; i < adapter->req_pages; i++) { | |
492 | cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; | |
493 | base += PAGE_SIZE; | |
494 | } | |
495 | ||
496 | base = adapter->cmpRingPA; | |
497 | for (i = 0; i < adapter->cmp_pages; i++) { | |
498 | cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; | |
499 | base += PAGE_SIZE; | |
500 | } | |
501 | ||
502 | memset(adapter->rings_state, 0, PAGE_SIZE); | |
503 | memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); | |
504 | memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); | |
505 | ||
506 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, | |
507 | &cmd, sizeof(cmd)); | |
508 | ||
509 | if (adapter->use_msg) { | |
510 | struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; | |
511 | ||
512 | cmd_msg.numPages = adapter->msg_pages; | |
513 | ||
514 | base = adapter->msgRingPA; | |
515 | for (i = 0; i < adapter->msg_pages; i++) { | |
516 | cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; | |
517 | base += PAGE_SIZE; | |
518 | } | |
519 | memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); | |
520 | ||
521 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, | |
522 | &cmd_msg, sizeof(cmd_msg)); | |
523 | } | |
524 | } | |
525 | ||
db5ed4df | 526 | static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
02845560 | 527 | { |
02845560 | 528 | if (!sdev->tagged_supported) |
1e6f2416 | 529 | qdepth = 1; |
39f79500 | 530 | return scsi_change_queue_depth(sdev, qdepth); |
02845560 AK |
531 | } |
532 | ||
851b1642 AK |
533 | /* |
534 | * Pull a completion descriptor off and pass the completion back | |
535 | * to the SCSI mid layer. | |
536 | */ | |
537 | static void pvscsi_complete_request(struct pvscsi_adapter *adapter, | |
538 | const struct PVSCSIRingCmpDesc *e) | |
539 | { | |
540 | struct pvscsi_ctx *ctx; | |
541 | struct scsi_cmnd *cmd; | |
a2713cce | 542 | struct completion *abort_cmp; |
851b1642 AK |
543 | u32 btstat = e->hostStatus; |
544 | u32 sdstat = e->scsiStatus; | |
545 | ||
546 | ctx = pvscsi_get_context(adapter, e->context); | |
547 | cmd = ctx->cmd; | |
a2713cce | 548 | abort_cmp = ctx->abort_cmp; |
851b1642 AK |
549 | pvscsi_unmap_buffers(adapter, ctx); |
550 | pvscsi_release_context(adapter, ctx); | |
a2713cce AK |
551 | if (abort_cmp) { |
552 | /* | |
553 | * The command was requested to be aborted. Just signal that | |
554 | * the request completed and swallow the actual cmd completion | |
555 | * here. The abort handler will post a completion for this | |
556 | * command indicating that it got successfully aborted. | |
557 | */ | |
558 | complete(abort_cmp); | |
559 | return; | |
560 | } | |
851b1642 | 561 | |
a2713cce | 562 | cmd->result = 0; |
851b1642 AK |
563 | if (sdstat != SAM_STAT_GOOD && |
564 | (btstat == BTSTAT_SUCCESS || | |
565 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED || | |
566 | btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { | |
567 | cmd->result = (DID_OK << 16) | sdstat; | |
568 | if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer) | |
569 | cmd->result |= (DRIVER_SENSE << 24); | |
570 | } else | |
571 | switch (btstat) { | |
572 | case BTSTAT_SUCCESS: | |
573 | case BTSTAT_LINKED_COMMAND_COMPLETED: | |
574 | case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: | |
575 | /* If everything went fine, let's move on.. */ | |
576 | cmd->result = (DID_OK << 16); | |
577 | break; | |
578 | ||
579 | case BTSTAT_DATARUN: | |
580 | case BTSTAT_DATA_UNDERRUN: | |
581 | /* Report residual data in underruns */ | |
582 | scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); | |
583 | cmd->result = (DID_ERROR << 16); | |
584 | break; | |
585 | ||
586 | case BTSTAT_SELTIMEO: | |
587 | /* Our emulation returns this for non-connected devs */ | |
588 | cmd->result = (DID_BAD_TARGET << 16); | |
589 | break; | |
590 | ||
591 | case BTSTAT_LUNMISMATCH: | |
592 | case BTSTAT_TAGREJECT: | |
593 | case BTSTAT_BADMSG: | |
594 | cmd->result = (DRIVER_INVALID << 24); | |
595 | /* fall through */ | |
596 | ||
597 | case BTSTAT_HAHARDWARE: | |
598 | case BTSTAT_INVPHASE: | |
599 | case BTSTAT_HATIMEOUT: | |
600 | case BTSTAT_NORESPONSE: | |
601 | case BTSTAT_DISCONNECT: | |
602 | case BTSTAT_HASOFTWARE: | |
603 | case BTSTAT_BUSFREE: | |
604 | case BTSTAT_SENSFAILED: | |
605 | cmd->result |= (DID_ERROR << 16); | |
606 | break; | |
607 | ||
608 | case BTSTAT_SENTRST: | |
609 | case BTSTAT_RECVRST: | |
610 | case BTSTAT_BUSRESET: | |
611 | cmd->result = (DID_RESET << 16); | |
612 | break; | |
613 | ||
614 | case BTSTAT_ABORTQUEUE: | |
615 | cmd->result = (DID_ABORT << 16); | |
616 | break; | |
617 | ||
618 | case BTSTAT_SCSIPARITY: | |
619 | cmd->result = (DID_PARITY << 16); | |
620 | break; | |
621 | ||
622 | default: | |
623 | cmd->result = (DID_ERROR << 16); | |
624 | scmd_printk(KERN_DEBUG, cmd, | |
625 | "Unknown completion status: 0x%x\n", | |
626 | btstat); | |
627 | } | |
628 | ||
629 | dev_dbg(&cmd->device->sdev_gendev, | |
630 | "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", | |
631 | cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); | |
632 | ||
633 | cmd->scsi_done(cmd); | |
634 | } | |
635 | ||
636 | /* | |
637 | * barrier usage : Since the PVSCSI device is emulated, there could be cases | |
638 | * where we may want to serialize some accesses between the driver and the | |
639 | * emulation layer. We use compiler barriers instead of the more expensive | |
640 | * memory barriers because PVSCSI is only supported on X86 which has strong | |
641 | * memory access ordering. | |
642 | */ | |
643 | static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) | |
644 | { | |
645 | struct PVSCSIRingsState *s = adapter->rings_state; | |
646 | struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; | |
647 | u32 cmp_entries = s->cmpNumEntriesLog2; | |
648 | ||
649 | while (s->cmpConsIdx != s->cmpProdIdx) { | |
650 | struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & | |
651 | MASK(cmp_entries)); | |
652 | /* | |
653 | * This barrier() ensures that *e is not dereferenced while | |
654 | * the device emulation still writes data into the slot. | |
655 | * Since the device emulation advances s->cmpProdIdx only after | |
656 | * updating the slot we want to check it first. | |
657 | */ | |
658 | barrier(); | |
659 | pvscsi_complete_request(adapter, e); | |
660 | /* | |
661 | * This barrier() ensures that compiler doesn't reorder write | |
662 | * to s->cmpConsIdx before the read of (*e) inside | |
663 | * pvscsi_complete_request. Otherwise, device emulation may | |
664 | * overwrite *e before we had a chance to read it. | |
665 | */ | |
666 | barrier(); | |
667 | s->cmpConsIdx++; | |
668 | } | |
669 | } | |
670 | ||
671 | /* | |
672 | * Translate a Linux SCSI request into a request ring entry. | |
673 | */ | |
674 | static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, | |
675 | struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) | |
676 | { | |
677 | struct PVSCSIRingsState *s; | |
678 | struct PVSCSIRingReqDesc *e; | |
679 | struct scsi_device *sdev; | |
680 | u32 req_entries; | |
681 | ||
682 | s = adapter->rings_state; | |
683 | sdev = cmd->device; | |
684 | req_entries = s->reqNumEntriesLog2; | |
685 | ||
686 | /* | |
687 | * If this condition holds, we might have room on the request ring, but | |
688 | * we might not have room on the completion ring for the response. | |
689 | * However, we have already ruled out this possibility - we would not | |
690 | * have successfully allocated a context if it were true, since we only | |
691 | * have one context per request entry. Check for it anyway, since it | |
692 | * would be a serious bug. | |
693 | */ | |
694 | if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { | |
695 | scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " | |
696 | "ring full: reqProdIdx=%d cmpConsIdx=%d\n", | |
697 | s->reqProdIdx, s->cmpConsIdx); | |
698 | return -1; | |
699 | } | |
700 | ||
701 | e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); | |
702 | ||
703 | e->bus = sdev->channel; | |
704 | e->target = sdev->id; | |
705 | memset(e->lun, 0, sizeof(e->lun)); | |
706 | e->lun[1] = sdev->lun; | |
707 | ||
708 | if (cmd->sense_buffer) { | |
709 | ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer, | |
710 | SCSI_SENSE_BUFFERSIZE, | |
711 | PCI_DMA_FROMDEVICE); | |
c965853a JB |
712 | if (pci_dma_mapping_error(adapter->dev, ctx->sensePA)) { |
713 | scmd_printk(KERN_ERR, cmd, | |
714 | "vmw_pvscsi: Failed to map sense buffer for DMA.\n"); | |
715 | ctx->sensePA = 0; | |
716 | return -ENOMEM; | |
717 | } | |
851b1642 AK |
718 | e->senseAddr = ctx->sensePA; |
719 | e->senseLen = SCSI_SENSE_BUFFERSIZE; | |
720 | } else { | |
721 | e->senseLen = 0; | |
722 | e->senseAddr = 0; | |
723 | } | |
724 | e->cdbLen = cmd->cmd_len; | |
725 | e->vcpuHint = smp_processor_id(); | |
726 | memcpy(e->cdb, cmd->cmnd, e->cdbLen); | |
727 | ||
728 | e->tag = SIMPLE_QUEUE_TAG; | |
851b1642 AK |
729 | |
730 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) | |
731 | e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; | |
732 | else if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
733 | e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; | |
734 | else if (cmd->sc_data_direction == DMA_NONE) | |
735 | e->flags = PVSCSI_FLAG_CMD_DIR_NONE; | |
736 | else | |
737 | e->flags = 0; | |
738 | ||
c965853a JB |
739 | if (pvscsi_map_buffers(adapter, ctx, cmd, e) != 0) { |
740 | if (cmd->sense_buffer) { | |
741 | pci_unmap_single(adapter->dev, ctx->sensePA, | |
742 | SCSI_SENSE_BUFFERSIZE, | |
743 | PCI_DMA_FROMDEVICE); | |
744 | ctx->sensePA = 0; | |
745 | } | |
746 | return -ENOMEM; | |
747 | } | |
851b1642 AK |
748 | |
749 | e->context = pvscsi_map_context(adapter, ctx); | |
750 | ||
751 | barrier(); | |
752 | ||
753 | s->reqProdIdx++; | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
f281233d | 758 | static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) |
851b1642 AK |
759 | { |
760 | struct Scsi_Host *host = cmd->device->host; | |
761 | struct pvscsi_adapter *adapter = shost_priv(host); | |
762 | struct pvscsi_ctx *ctx; | |
763 | unsigned long flags; | |
764 | ||
765 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
766 | ||
767 | ctx = pvscsi_acquire_context(adapter, cmd); | |
768 | if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { | |
769 | if (ctx) | |
770 | pvscsi_release_context(adapter, ctx); | |
771 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
772 | return SCSI_MLQUEUE_HOST_BUSY; | |
773 | } | |
774 | ||
775 | cmd->scsi_done = done; | |
776 | ||
777 | dev_dbg(&cmd->device->sdev_gendev, | |
778 | "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]); | |
779 | ||
780 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
781 | ||
782 | pvscsi_kick_io(adapter, cmd->cmnd[0]); | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
f281233d JG |
787 | static DEF_SCSI_QCMD(pvscsi_queue) |
788 | ||
851b1642 AK |
789 | static int pvscsi_abort(struct scsi_cmnd *cmd) |
790 | { | |
791 | struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); | |
792 | struct pvscsi_ctx *ctx; | |
793 | unsigned long flags; | |
a2713cce AK |
794 | int result = SUCCESS; |
795 | DECLARE_COMPLETION_ONSTACK(abort_cmp); | |
851b1642 AK |
796 | |
797 | scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", | |
798 | adapter->host->host_no, cmd); | |
799 | ||
800 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
801 | ||
802 | /* | |
803 | * Poll the completion ring first - we might be trying to abort | |
804 | * a command that is waiting to be dispatched in the completion ring. | |
805 | */ | |
806 | pvscsi_process_completion_ring(adapter); | |
807 | ||
808 | /* | |
809 | * If there is no context for the command, it either already succeeded | |
810 | * or else was never properly issued. Not our problem. | |
811 | */ | |
812 | ctx = pvscsi_find_context(adapter, cmd); | |
813 | if (!ctx) { | |
814 | scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); | |
815 | goto out; | |
816 | } | |
817 | ||
a2713cce AK |
818 | /* |
819 | * Mark that the command has been requested to be aborted and issue | |
820 | * the abort. | |
821 | */ | |
822 | ctx->abort_cmp = &abort_cmp; | |
823 | ||
851b1642 | 824 | pvscsi_abort_cmd(adapter, ctx); |
a2713cce AK |
825 | spin_unlock_irqrestore(&adapter->hw_lock, flags); |
826 | /* Wait for 2 secs for the completion. */ | |
827 | wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000)); | |
828 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
851b1642 | 829 | |
a2713cce AK |
830 | if (!completion_done(&abort_cmp)) { |
831 | /* | |
832 | * Failed to abort the command, unmark the fact that it | |
833 | * was requested to be aborted. | |
834 | */ | |
835 | ctx->abort_cmp = NULL; | |
836 | result = FAILED; | |
837 | scmd_printk(KERN_DEBUG, cmd, | |
838 | "Failed to get completion for aborted cmd %p\n", | |
839 | cmd); | |
840 | goto out; | |
841 | } | |
842 | ||
843 | /* | |
844 | * Successfully aborted the command. | |
845 | */ | |
846 | cmd->result = (DID_ABORT << 16); | |
847 | cmd->scsi_done(cmd); | |
851b1642 AK |
848 | |
849 | out: | |
850 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
a2713cce | 851 | return result; |
851b1642 AK |
852 | } |
853 | ||
854 | /* | |
855 | * Abort all outstanding requests. This is only safe to use if the completion | |
856 | * ring will never be walked again or the device has been reset, because it | |
857 | * destroys the 1-1 mapping between context field passed to emulation and our | |
858 | * request structure. | |
859 | */ | |
860 | static void pvscsi_reset_all(struct pvscsi_adapter *adapter) | |
861 | { | |
862 | unsigned i; | |
863 | ||
864 | for (i = 0; i < adapter->req_depth; i++) { | |
865 | struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; | |
866 | struct scsi_cmnd *cmd = ctx->cmd; | |
867 | if (cmd) { | |
868 | scmd_printk(KERN_ERR, cmd, | |
869 | "Forced reset on cmd %p\n", cmd); | |
870 | pvscsi_unmap_buffers(adapter, ctx); | |
871 | pvscsi_release_context(adapter, ctx); | |
872 | cmd->result = (DID_RESET << 16); | |
873 | cmd->scsi_done(cmd); | |
874 | } | |
875 | } | |
876 | } | |
877 | ||
878 | static int pvscsi_host_reset(struct scsi_cmnd *cmd) | |
879 | { | |
880 | struct Scsi_Host *host = cmd->device->host; | |
881 | struct pvscsi_adapter *adapter = shost_priv(host); | |
882 | unsigned long flags; | |
883 | bool use_msg; | |
884 | ||
885 | scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); | |
886 | ||
887 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
888 | ||
889 | use_msg = adapter->use_msg; | |
890 | ||
891 | if (use_msg) { | |
892 | adapter->use_msg = 0; | |
893 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
894 | ||
895 | /* | |
896 | * Now that we know that the ISR won't add more work on the | |
897 | * workqueue we can safely flush any outstanding work. | |
898 | */ | |
899 | flush_workqueue(adapter->workqueue); | |
900 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
901 | } | |
902 | ||
903 | /* | |
904 | * We're going to tear down the entire ring structure and set it back | |
905 | * up, so stalling new requests until all completions are flushed and | |
906 | * the rings are back in place. | |
907 | */ | |
908 | ||
909 | pvscsi_process_request_ring(adapter); | |
910 | ||
911 | ll_adapter_reset(adapter); | |
912 | ||
913 | /* | |
914 | * Now process any completions. Note we do this AFTER adapter reset, | |
915 | * which is strange, but stops races where completions get posted | |
916 | * between processing the ring and issuing the reset. The backend will | |
917 | * not touch the ring memory after reset, so the immediately pre-reset | |
918 | * completion ring state is still valid. | |
919 | */ | |
920 | pvscsi_process_completion_ring(adapter); | |
921 | ||
922 | pvscsi_reset_all(adapter); | |
923 | adapter->use_msg = use_msg; | |
924 | pvscsi_setup_all_rings(adapter); | |
925 | pvscsi_unmask_intr(adapter); | |
926 | ||
927 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
928 | ||
929 | return SUCCESS; | |
930 | } | |
931 | ||
932 | static int pvscsi_bus_reset(struct scsi_cmnd *cmd) | |
933 | { | |
934 | struct Scsi_Host *host = cmd->device->host; | |
935 | struct pvscsi_adapter *adapter = shost_priv(host); | |
936 | unsigned long flags; | |
937 | ||
938 | scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); | |
939 | ||
940 | /* | |
941 | * We don't want to queue new requests for this bus after | |
942 | * flushing all pending requests to emulation, since new | |
943 | * requests could then sneak in during this bus reset phase, | |
944 | * so take the lock now. | |
945 | */ | |
946 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
947 | ||
948 | pvscsi_process_request_ring(adapter); | |
949 | ll_bus_reset(adapter); | |
950 | pvscsi_process_completion_ring(adapter); | |
951 | ||
952 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
953 | ||
954 | return SUCCESS; | |
955 | } | |
956 | ||
957 | static int pvscsi_device_reset(struct scsi_cmnd *cmd) | |
958 | { | |
959 | struct Scsi_Host *host = cmd->device->host; | |
960 | struct pvscsi_adapter *adapter = shost_priv(host); | |
961 | unsigned long flags; | |
962 | ||
963 | scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", | |
964 | host->host_no, cmd->device->id); | |
965 | ||
966 | /* | |
967 | * We don't want to queue new requests for this device after flushing | |
968 | * all pending requests to emulation, since new requests could then | |
969 | * sneak in during this device reset phase, so take the lock now. | |
970 | */ | |
971 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
972 | ||
973 | pvscsi_process_request_ring(adapter); | |
974 | ll_device_reset(adapter, cmd->device->id); | |
975 | pvscsi_process_completion_ring(adapter); | |
976 | ||
977 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
978 | ||
979 | return SUCCESS; | |
980 | } | |
981 | ||
982 | static struct scsi_host_template pvscsi_template; | |
983 | ||
984 | static const char *pvscsi_info(struct Scsi_Host *host) | |
985 | { | |
986 | struct pvscsi_adapter *adapter = shost_priv(host); | |
987 | static char buf[256]; | |
988 | ||
989 | sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " | |
990 | "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, | |
991 | adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, | |
992 | pvscsi_template.cmd_per_lun); | |
993 | ||
994 | return buf; | |
995 | } | |
996 | ||
997 | static struct scsi_host_template pvscsi_template = { | |
998 | .module = THIS_MODULE, | |
999 | .name = "VMware PVSCSI Host Adapter", | |
1000 | .proc_name = "vmw_pvscsi", | |
1001 | .info = pvscsi_info, | |
1002 | .queuecommand = pvscsi_queue, | |
1003 | .this_id = -1, | |
1004 | .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, | |
1005 | .dma_boundary = UINT_MAX, | |
1006 | .max_sectors = 0xffff, | |
1007 | .use_clustering = ENABLE_CLUSTERING, | |
02845560 | 1008 | .change_queue_depth = pvscsi_change_queue_depth, |
851b1642 AK |
1009 | .eh_abort_handler = pvscsi_abort, |
1010 | .eh_device_reset_handler = pvscsi_device_reset, | |
1011 | .eh_bus_reset_handler = pvscsi_bus_reset, | |
1012 | .eh_host_reset_handler = pvscsi_host_reset, | |
1013 | }; | |
1014 | ||
1015 | static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, | |
1016 | const struct PVSCSIRingMsgDesc *e) | |
1017 | { | |
1018 | struct PVSCSIRingsState *s = adapter->rings_state; | |
1019 | struct Scsi_Host *host = adapter->host; | |
1020 | struct scsi_device *sdev; | |
1021 | ||
1022 | printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", | |
1023 | e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); | |
1024 | ||
1025 | BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); | |
1026 | ||
1027 | if (e->type == PVSCSI_MSG_DEV_ADDED) { | |
1028 | struct PVSCSIMsgDescDevStatusChanged *desc; | |
1029 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; | |
1030 | ||
1031 | printk(KERN_INFO | |
1032 | "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", | |
1033 | desc->bus, desc->target, desc->lun[1]); | |
1034 | ||
1035 | if (!scsi_host_get(host)) | |
1036 | return; | |
1037 | ||
1038 | sdev = scsi_device_lookup(host, desc->bus, desc->target, | |
1039 | desc->lun[1]); | |
1040 | if (sdev) { | |
1041 | printk(KERN_INFO "vmw_pvscsi: device already exists\n"); | |
1042 | scsi_device_put(sdev); | |
1043 | } else | |
1044 | scsi_add_device(adapter->host, desc->bus, | |
1045 | desc->target, desc->lun[1]); | |
1046 | ||
1047 | scsi_host_put(host); | |
1048 | } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { | |
1049 | struct PVSCSIMsgDescDevStatusChanged *desc; | |
1050 | desc = (struct PVSCSIMsgDescDevStatusChanged *)e; | |
1051 | ||
1052 | printk(KERN_INFO | |
1053 | "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", | |
1054 | desc->bus, desc->target, desc->lun[1]); | |
1055 | ||
1056 | if (!scsi_host_get(host)) | |
1057 | return; | |
1058 | ||
1059 | sdev = scsi_device_lookup(host, desc->bus, desc->target, | |
1060 | desc->lun[1]); | |
1061 | if (sdev) { | |
1062 | scsi_remove_device(sdev); | |
1063 | scsi_device_put(sdev); | |
1064 | } else | |
1065 | printk(KERN_INFO | |
1066 | "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", | |
1067 | desc->bus, desc->target, desc->lun[1]); | |
1068 | ||
1069 | scsi_host_put(host); | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) | |
1074 | { | |
1075 | struct PVSCSIRingsState *s = adapter->rings_state; | |
1076 | ||
1077 | return s->msgProdIdx != s->msgConsIdx; | |
1078 | } | |
1079 | ||
1080 | static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) | |
1081 | { | |
1082 | struct PVSCSIRingsState *s = adapter->rings_state; | |
1083 | struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; | |
1084 | u32 msg_entries = s->msgNumEntriesLog2; | |
1085 | ||
1086 | while (pvscsi_msg_pending(adapter)) { | |
1087 | struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & | |
1088 | MASK(msg_entries)); | |
1089 | ||
1090 | barrier(); | |
1091 | pvscsi_process_msg(adapter, e); | |
1092 | barrier(); | |
1093 | s->msgConsIdx++; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | static void pvscsi_msg_workqueue_handler(struct work_struct *data) | |
1098 | { | |
1099 | struct pvscsi_adapter *adapter; | |
1100 | ||
1101 | adapter = container_of(data, struct pvscsi_adapter, work); | |
1102 | ||
1103 | pvscsi_process_msg_ring(adapter); | |
1104 | } | |
1105 | ||
1106 | static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) | |
1107 | { | |
1108 | char name[32]; | |
1109 | ||
1110 | if (!pvscsi_use_msg) | |
1111 | return 0; | |
1112 | ||
1113 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, | |
1114 | PVSCSI_CMD_SETUP_MSG_RING); | |
1115 | ||
1116 | if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) | |
1117 | return 0; | |
1118 | ||
1119 | snprintf(name, sizeof(name), | |
1120 | "vmw_pvscsi_wq_%u", adapter->host->host_no); | |
1121 | ||
1122 | adapter->workqueue = create_singlethread_workqueue(name); | |
1123 | if (!adapter->workqueue) { | |
1124 | printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); | |
1125 | return 0; | |
1126 | } | |
1127 | INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); | |
1128 | ||
1129 | return 1; | |
1130 | } | |
1131 | ||
2a815b5a RM |
1132 | static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, |
1133 | bool enable) | |
1134 | { | |
1135 | u32 val; | |
1136 | ||
1137 | if (!pvscsi_use_req_threshold) | |
1138 | return false; | |
1139 | ||
1140 | pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, | |
1141 | PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); | |
1142 | val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS); | |
1143 | if (val == -1) { | |
1144 | printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n"); | |
1145 | return false; | |
1146 | } else { | |
1147 | struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; | |
1148 | cmd_msg.enable = enable; | |
1149 | printk(KERN_INFO | |
1150 | "vmw_pvscsi: %sabling reqCallThreshold\n", | |
1151 | enable ? "en" : "dis"); | |
1152 | pvscsi_write_cmd_desc(adapter, | |
1153 | PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, | |
1154 | &cmd_msg, sizeof(cmd_msg)); | |
1155 | return pvscsi_reg_read(adapter, | |
1156 | PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; | |
1157 | } | |
1158 | } | |
1159 | ||
851b1642 AK |
1160 | static irqreturn_t pvscsi_isr(int irq, void *devp) |
1161 | { | |
1162 | struct pvscsi_adapter *adapter = devp; | |
1163 | int handled; | |
1164 | ||
1165 | if (adapter->use_msi || adapter->use_msix) | |
1166 | handled = true; | |
1167 | else { | |
1168 | u32 val = pvscsi_read_intr_status(adapter); | |
1169 | handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0; | |
1170 | if (handled) | |
1171 | pvscsi_write_intr_status(devp, val); | |
1172 | } | |
1173 | ||
1174 | if (handled) { | |
1175 | unsigned long flags; | |
1176 | ||
1177 | spin_lock_irqsave(&adapter->hw_lock, flags); | |
1178 | ||
1179 | pvscsi_process_completion_ring(adapter); | |
1180 | if (adapter->use_msg && pvscsi_msg_pending(adapter)) | |
1181 | queue_work(adapter->workqueue, &adapter->work); | |
1182 | ||
1183 | spin_unlock_irqrestore(&adapter->hw_lock, flags); | |
1184 | } | |
1185 | ||
1186 | return IRQ_RETVAL(handled); | |
1187 | } | |
1188 | ||
1189 | static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) | |
1190 | { | |
1191 | struct pvscsi_ctx *ctx = adapter->cmd_map; | |
1192 | unsigned i; | |
1193 | ||
1194 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) | |
1195 | free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); | |
1196 | } | |
1197 | ||
d0e2ddff DT |
1198 | static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, |
1199 | unsigned int *irq) | |
851b1642 AK |
1200 | { |
1201 | struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION }; | |
1202 | int ret; | |
1203 | ||
db1924d0 | 1204 | ret = pci_enable_msix_exact(adapter->dev, &entry, 1); |
851b1642 AK |
1205 | if (ret) |
1206 | return ret; | |
1207 | ||
1208 | *irq = entry.vector; | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) | |
1214 | { | |
1215 | if (adapter->irq) { | |
1216 | free_irq(adapter->irq, adapter); | |
1217 | adapter->irq = 0; | |
1218 | } | |
1219 | if (adapter->use_msi) { | |
1220 | pci_disable_msi(adapter->dev); | |
1221 | adapter->use_msi = 0; | |
1222 | } else if (adapter->use_msix) { | |
1223 | pci_disable_msix(adapter->dev); | |
1224 | adapter->use_msix = 0; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | static void pvscsi_release_resources(struct pvscsi_adapter *adapter) | |
1229 | { | |
1230 | pvscsi_shutdown_intr(adapter); | |
1231 | ||
1232 | if (adapter->workqueue) | |
1233 | destroy_workqueue(adapter->workqueue); | |
1234 | ||
1235 | if (adapter->mmioBase) | |
1236 | pci_iounmap(adapter->dev, adapter->mmioBase); | |
1237 | ||
1238 | pci_release_regions(adapter->dev); | |
1239 | ||
1240 | if (adapter->cmd_map) { | |
1241 | pvscsi_free_sgls(adapter); | |
1242 | kfree(adapter->cmd_map); | |
1243 | } | |
1244 | ||
1245 | if (adapter->rings_state) | |
1246 | pci_free_consistent(adapter->dev, PAGE_SIZE, | |
1247 | adapter->rings_state, adapter->ringStatePA); | |
1248 | ||
1249 | if (adapter->req_ring) | |
1250 | pci_free_consistent(adapter->dev, | |
1251 | adapter->req_pages * PAGE_SIZE, | |
1252 | adapter->req_ring, adapter->reqRingPA); | |
1253 | ||
1254 | if (adapter->cmp_ring) | |
1255 | pci_free_consistent(adapter->dev, | |
1256 | adapter->cmp_pages * PAGE_SIZE, | |
1257 | adapter->cmp_ring, adapter->cmpRingPA); | |
1258 | ||
1259 | if (adapter->msg_ring) | |
1260 | pci_free_consistent(adapter->dev, | |
1261 | adapter->msg_pages * PAGE_SIZE, | |
1262 | adapter->msg_ring, adapter->msgRingPA); | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Allocate scatter gather lists. | |
1267 | * | |
1268 | * These are statically allocated. Trying to be clever was not worth it. | |
1269 | * | |
42b2aa86 | 1270 | * Dynamic allocation can fail, and we can't go deep into the memory |
851b1642 AK |
1271 | * allocator, since we're a SCSI driver, and trying too hard to allocate |
1272 | * memory might generate disk I/O. We also don't want to fail disk I/O | |
1273 | * in that case because we can't get an allocation - the I/O could be | |
1274 | * trying to swap out data to free memory. Since that is pathological, | |
1275 | * just use a statically allocated scatter list. | |
1276 | * | |
1277 | */ | |
6f039790 | 1278 | static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter) |
851b1642 AK |
1279 | { |
1280 | struct pvscsi_ctx *ctx; | |
1281 | int i; | |
1282 | ||
1283 | ctx = adapter->cmd_map; | |
1284 | BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); | |
1285 | ||
1286 | for (i = 0; i < adapter->req_depth; ++i, ++ctx) { | |
1287 | ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, | |
1288 | get_order(SGL_SIZE)); | |
1289 | ctx->sglPA = 0; | |
1290 | BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); | |
1291 | if (!ctx->sgl) { | |
1292 | for (; i >= 0; --i, --ctx) { | |
1293 | free_pages((unsigned long)ctx->sgl, | |
1294 | get_order(SGL_SIZE)); | |
1295 | ctx->sgl = NULL; | |
1296 | } | |
1297 | return -ENOMEM; | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
a9310735 AK |
1304 | /* |
1305 | * Query the device, fetch the config info and return the | |
1306 | * maximum number of targets on the adapter. In case of | |
1307 | * failure due to any reason return default i.e. 16. | |
1308 | */ | |
1309 | static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter) | |
1310 | { | |
1311 | struct PVSCSICmdDescConfigCmd cmd; | |
1312 | struct PVSCSIConfigPageHeader *header; | |
1313 | struct device *dev; | |
1314 | dma_addr_t configPagePA; | |
1315 | void *config_page; | |
1316 | u32 numPhys = 16; | |
1317 | ||
1318 | dev = pvscsi_dev(adapter); | |
1319 | config_page = pci_alloc_consistent(adapter->dev, PAGE_SIZE, | |
1320 | &configPagePA); | |
1321 | if (!config_page) { | |
1322 | dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n"); | |
1323 | goto exit; | |
1324 | } | |
1325 | BUG_ON(configPagePA & ~PAGE_MASK); | |
1326 | ||
1327 | /* Fetch config info from the device. */ | |
1328 | cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32; | |
1329 | cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER; | |
1330 | cmd.cmpAddr = configPagePA; | |
1331 | cmd._pad = 0; | |
1332 | ||
1333 | /* | |
1334 | * Mark the completion page header with error values. If the device | |
1335 | * completes the command successfully, it sets the status values to | |
1336 | * indicate success. | |
1337 | */ | |
1338 | header = config_page; | |
1339 | memset(header, 0, sizeof *header); | |
1340 | header->hostStatus = BTSTAT_INVPARAM; | |
1341 | header->scsiStatus = SDSTAT_CHECK; | |
1342 | ||
1343 | pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd); | |
1344 | ||
1345 | if (header->hostStatus == BTSTAT_SUCCESS && | |
1346 | header->scsiStatus == SDSTAT_GOOD) { | |
1347 | struct PVSCSIConfigPageController *config; | |
1348 | ||
1349 | config = config_page; | |
1350 | numPhys = config->numPhys; | |
1351 | } else | |
1352 | dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n", | |
1353 | header->hostStatus, header->scsiStatus); | |
1354 | pci_free_consistent(adapter->dev, PAGE_SIZE, config_page, configPagePA); | |
1355 | exit: | |
1356 | return numPhys; | |
1357 | } | |
1358 | ||
6f039790 | 1359 | static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
851b1642 AK |
1360 | { |
1361 | struct pvscsi_adapter *adapter; | |
02845560 AK |
1362 | struct pvscsi_adapter adapter_temp; |
1363 | struct Scsi_Host *host = NULL; | |
851b1642 AK |
1364 | unsigned int i; |
1365 | unsigned long flags = 0; | |
1366 | int error; | |
02845560 | 1367 | u32 max_id; |
851b1642 AK |
1368 | |
1369 | error = -ENODEV; | |
1370 | ||
1371 | if (pci_enable_device(pdev)) | |
1372 | return error; | |
1373 | ||
1374 | if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 && | |
1375 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) { | |
1376 | printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); | |
1377 | } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 && | |
1378 | pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) { | |
1379 | printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); | |
1380 | } else { | |
1381 | printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); | |
1382 | goto out_disable_device; | |
1383 | } | |
1384 | ||
02845560 AK |
1385 | /* |
1386 | * Let's use a temp pvscsi_adapter struct until we find the number of | |
1387 | * targets on the adapter, after that we will switch to the real | |
1388 | * allocated struct. | |
1389 | */ | |
1390 | adapter = &adapter_temp; | |
851b1642 AK |
1391 | memset(adapter, 0, sizeof(*adapter)); |
1392 | adapter->dev = pdev; | |
851b1642 AK |
1393 | adapter->rev = pdev->revision; |
1394 | ||
1395 | if (pci_request_regions(pdev, "vmw_pvscsi")) { | |
1396 | printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); | |
02845560 | 1397 | goto out_disable_device; |
851b1642 AK |
1398 | } |
1399 | ||
1400 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
1401 | if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) | |
1402 | continue; | |
1403 | ||
1404 | if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) | |
1405 | continue; | |
1406 | ||
1407 | break; | |
1408 | } | |
1409 | ||
1410 | if (i == DEVICE_COUNT_RESOURCE) { | |
1411 | printk(KERN_ERR | |
1412 | "vmw_pvscsi: adapter has no suitable MMIO region\n"); | |
02845560 | 1413 | goto out_release_resources_and_disable; |
851b1642 AK |
1414 | } |
1415 | ||
1416 | adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); | |
1417 | ||
1418 | if (!adapter->mmioBase) { | |
1419 | printk(KERN_ERR | |
1420 | "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", | |
1421 | i, PVSCSI_MEM_SPACE_SIZE); | |
02845560 | 1422 | goto out_release_resources_and_disable; |
851b1642 AK |
1423 | } |
1424 | ||
1425 | pci_set_master(pdev); | |
02845560 AK |
1426 | |
1427 | /* | |
1428 | * Ask the device for max number of targets before deciding the | |
1429 | * default pvscsi_ring_pages value. | |
1430 | */ | |
1431 | max_id = pvscsi_get_max_targets(adapter); | |
1432 | printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id); | |
1433 | ||
1434 | if (pvscsi_ring_pages == 0) | |
1435 | /* | |
1436 | * Set the right default value. Up to 16 it is 8, above it is | |
1437 | * max. | |
1438 | */ | |
1439 | pvscsi_ring_pages = (max_id > 16) ? | |
1440 | PVSCSI_SETUP_RINGS_MAX_NUM_PAGES : | |
1441 | PVSCSI_DEFAULT_NUM_PAGES_PER_RING; | |
1442 | printk(KERN_INFO | |
1443 | "vmw_pvscsi: setting ring_pages to %d\n", | |
1444 | pvscsi_ring_pages); | |
1445 | ||
1446 | pvscsi_template.can_queue = | |
1447 | min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * | |
1448 | PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; | |
1449 | pvscsi_template.cmd_per_lun = | |
1450 | min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); | |
1451 | host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); | |
1452 | if (!host) { | |
1453 | printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); | |
1454 | goto out_release_resources_and_disable; | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * Let's use the real pvscsi_adapter struct here onwards. | |
1459 | */ | |
1460 | adapter = shost_priv(host); | |
1461 | memset(adapter, 0, sizeof(*adapter)); | |
1462 | adapter->dev = pdev; | |
1463 | adapter->host = host; | |
1464 | /* | |
1465 | * Copy back what we already have to the allocated adapter struct. | |
1466 | */ | |
1467 | adapter->rev = adapter_temp.rev; | |
1468 | adapter->mmioBase = adapter_temp.mmioBase; | |
1469 | ||
1470 | spin_lock_init(&adapter->hw_lock); | |
1471 | host->max_channel = 0; | |
1472 | host->max_lun = 1; | |
1473 | host->max_cmd_len = 16; | |
1474 | host->max_id = max_id; | |
1475 | ||
851b1642 AK |
1476 | pci_set_drvdata(pdev, host); |
1477 | ||
1478 | ll_adapter_reset(adapter); | |
1479 | ||
1480 | adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); | |
1481 | ||
1482 | error = pvscsi_allocate_rings(adapter); | |
1483 | if (error) { | |
1484 | printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); | |
1485 | goto out_release_resources; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * From this point on we should reset the adapter if anything goes | |
1490 | * wrong. | |
1491 | */ | |
1492 | pvscsi_setup_all_rings(adapter); | |
1493 | ||
1494 | adapter->cmd_map = kcalloc(adapter->req_depth, | |
1495 | sizeof(struct pvscsi_ctx), GFP_KERNEL); | |
1496 | if (!adapter->cmd_map) { | |
1497 | printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); | |
1498 | error = -ENOMEM; | |
1499 | goto out_reset_adapter; | |
1500 | } | |
1501 | ||
1502 | INIT_LIST_HEAD(&adapter->cmd_pool); | |
1503 | for (i = 0; i < adapter->req_depth; i++) { | |
1504 | struct pvscsi_ctx *ctx = adapter->cmd_map + i; | |
1505 | list_add(&ctx->list, &adapter->cmd_pool); | |
1506 | } | |
1507 | ||
1508 | error = pvscsi_allocate_sg(adapter); | |
1509 | if (error) { | |
1510 | printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); | |
1511 | goto out_reset_adapter; | |
1512 | } | |
1513 | ||
1514 | if (!pvscsi_disable_msix && | |
1515 | pvscsi_setup_msix(adapter, &adapter->irq) == 0) { | |
1516 | printk(KERN_INFO "vmw_pvscsi: using MSI-X\n"); | |
1517 | adapter->use_msix = 1; | |
1518 | } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) { | |
1519 | printk(KERN_INFO "vmw_pvscsi: using MSI\n"); | |
1520 | adapter->use_msi = 1; | |
1521 | adapter->irq = pdev->irq; | |
1522 | } else { | |
1523 | printk(KERN_INFO "vmw_pvscsi: using INTx\n"); | |
1524 | adapter->irq = pdev->irq; | |
1525 | flags = IRQF_SHARED; | |
1526 | } | |
1527 | ||
2a815b5a RM |
1528 | adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true); |
1529 | printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n", | |
1530 | adapter->use_req_threshold ? "en" : "dis"); | |
1531 | ||
851b1642 AK |
1532 | error = request_irq(adapter->irq, pvscsi_isr, flags, |
1533 | "vmw_pvscsi", adapter); | |
1534 | if (error) { | |
1535 | printk(KERN_ERR | |
1536 | "vmw_pvscsi: unable to request IRQ: %d\n", error); | |
1537 | adapter->irq = 0; | |
1538 | goto out_reset_adapter; | |
1539 | } | |
1540 | ||
1541 | error = scsi_add_host(host, &pdev->dev); | |
1542 | if (error) { | |
1543 | printk(KERN_ERR | |
1544 | "vmw_pvscsi: scsi_add_host failed: %d\n", error); | |
1545 | goto out_reset_adapter; | |
1546 | } | |
1547 | ||
1548 | dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", | |
1549 | adapter->rev, host->host_no); | |
1550 | ||
1551 | pvscsi_unmask_intr(adapter); | |
1552 | ||
1553 | scsi_scan_host(host); | |
1554 | ||
1555 | return 0; | |
1556 | ||
1557 | out_reset_adapter: | |
1558 | ll_adapter_reset(adapter); | |
1559 | out_release_resources: | |
1560 | pvscsi_release_resources(adapter); | |
851b1642 AK |
1561 | scsi_host_put(host); |
1562 | out_disable_device: | |
851b1642 AK |
1563 | pci_disable_device(pdev); |
1564 | ||
1565 | return error; | |
02845560 AK |
1566 | |
1567 | out_release_resources_and_disable: | |
1568 | pvscsi_release_resources(adapter); | |
1569 | goto out_disable_device; | |
851b1642 AK |
1570 | } |
1571 | ||
1572 | static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) | |
1573 | { | |
1574 | pvscsi_mask_intr(adapter); | |
1575 | ||
1576 | if (adapter->workqueue) | |
1577 | flush_workqueue(adapter->workqueue); | |
1578 | ||
1579 | pvscsi_shutdown_intr(adapter); | |
1580 | ||
1581 | pvscsi_process_request_ring(adapter); | |
1582 | pvscsi_process_completion_ring(adapter); | |
1583 | ll_adapter_reset(adapter); | |
1584 | } | |
1585 | ||
1586 | static void pvscsi_shutdown(struct pci_dev *dev) | |
1587 | { | |
1588 | struct Scsi_Host *host = pci_get_drvdata(dev); | |
1589 | struct pvscsi_adapter *adapter = shost_priv(host); | |
1590 | ||
1591 | __pvscsi_shutdown(adapter); | |
1592 | } | |
1593 | ||
1594 | static void pvscsi_remove(struct pci_dev *pdev) | |
1595 | { | |
1596 | struct Scsi_Host *host = pci_get_drvdata(pdev); | |
1597 | struct pvscsi_adapter *adapter = shost_priv(host); | |
1598 | ||
1599 | scsi_remove_host(host); | |
1600 | ||
1601 | __pvscsi_shutdown(adapter); | |
1602 | pvscsi_release_resources(adapter); | |
1603 | ||
1604 | scsi_host_put(host); | |
1605 | ||
851b1642 AK |
1606 | pci_disable_device(pdev); |
1607 | } | |
1608 | ||
1609 | static struct pci_driver pvscsi_pci_driver = { | |
1610 | .name = "vmw_pvscsi", | |
1611 | .id_table = pvscsi_pci_tbl, | |
1612 | .probe = pvscsi_probe, | |
6f039790 | 1613 | .remove = pvscsi_remove, |
851b1642 AK |
1614 | .shutdown = pvscsi_shutdown, |
1615 | }; | |
1616 | ||
1617 | static int __init pvscsi_init(void) | |
1618 | { | |
1619 | pr_info("%s - version %s\n", | |
1620 | PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); | |
1621 | return pci_register_driver(&pvscsi_pci_driver); | |
1622 | } | |
1623 | ||
1624 | static void __exit pvscsi_exit(void) | |
1625 | { | |
1626 | pci_unregister_driver(&pvscsi_pci_driver); | |
1627 | } | |
1628 | ||
1629 | module_init(pvscsi_init); | |
1630 | module_exit(pvscsi_exit); |