Commit | Line | Data |
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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
bef4a34a | 22 | #include <linux/init.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
bef4a34a HJ |
24 | #include <linux/module.h> |
25 | #include <linux/device.h> | |
26 | #include <linux/blkdev.h> | |
bef4a34a HJ |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_cmnd.h> | |
29 | #include <scsi/scsi_host.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_tcq.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 34 | #include <scsi/scsi_dbg.h> |
e3fe0bb6 | 35 | #include "hv_api.h" |
645954c5 | 36 | #include "logging.h" |
2d82f6c7 | 37 | #include "version_info.h" |
870cde80 | 38 | #include "vmbus.h" |
bb969793 | 39 | #include "storvsc_api.h" |
af3043c6 S |
40 | #include "vstorage.h" |
41 | #include "channel.h" | |
bef4a34a | 42 | |
2db2cabe | 43 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
bef4a34a | 44 | |
3d598ce1 S |
45 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
46 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
47 | ||
0f0cdc6a | 48 | static const char *driver_name = "storvsc"; |
6dec2442 S |
49 | |
50 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ | |
51 | static const struct hv_guid gStorVscDeviceType = { | |
52 | .data = { | |
53 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
54 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
55 | } | |
56 | }; | |
57 | ||
972621c9 | 58 | struct hv_host_device { |
97c15296 | 59 | struct hv_device *dev; |
ff568d3a GKH |
60 | struct kmem_cache *request_pool; |
61 | unsigned int port; | |
62 | unsigned char path; | |
63 | unsigned char target; | |
bef4a34a HJ |
64 | }; |
65 | ||
66 | struct storvsc_cmd_request { | |
ff568d3a GKH |
67 | struct list_head entry; |
68 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
69 | |
70 | unsigned int bounce_sgl_count; | |
ff568d3a | 71 | struct scatterlist *bounce_sgl; |
bef4a34a | 72 | |
0b3f6834 | 73 | struct hv_storvsc_request request; |
bef4a34a HJ |
74 | }; |
75 | ||
bef4a34a | 76 | |
5b60acee S |
77 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
78 | { | |
79 | /* | |
80 | * This enables luns to be located sparsely. Otherwise, we may not | |
81 | * discovered them. | |
82 | */ | |
83 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
84 | return 0; | |
85 | } | |
86 | ||
a1ebfeae S |
87 | static int storvsc_merge_bvec(struct request_queue *q, |
88 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
89 | { | |
90 | /* checking done by caller. */ | |
91 | return bvec->bv_len; | |
92 | } | |
93 | ||
419f2d03 S |
94 | static int storvsc_device_configure(struct scsi_device *sdevice) |
95 | { | |
96 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
97 | STORVSC_MAX_IO_REQUESTS); | |
98 | ||
99 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", | |
100 | sdevice, PAGE_SIZE); | |
101 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); | |
102 | ||
103 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", | |
104 | sdevice); | |
105 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
106 | ||
107 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
108 | |
109 | return 0; | |
110 | } | |
111 | ||
49a3c7a9 S |
112 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
113 | unsigned int sg_count) | |
114 | { | |
115 | int i; | |
116 | struct page *page_buf; | |
117 | ||
118 | for (i = 0; i < sg_count; i++) { | |
119 | page_buf = sg_page((&sgl[i])); | |
120 | if (page_buf != NULL) | |
121 | __free_page(page_buf); | |
122 | } | |
123 | ||
124 | kfree(sgl); | |
125 | } | |
126 | ||
3862ef3e S |
127 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
128 | { | |
129 | int i; | |
130 | ||
131 | /* No need to check */ | |
132 | if (sg_count < 2) | |
133 | return -1; | |
134 | ||
135 | /* We have at least 2 sg entries */ | |
136 | for (i = 0; i < sg_count; i++) { | |
137 | if (i == 0) { | |
138 | /* make sure 1st one does not have hole */ | |
139 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
140 | return i; | |
141 | } else if (i == sg_count - 1) { | |
142 | /* make sure last one does not have hole */ | |
143 | if (sgl[i].offset != 0) | |
144 | return i; | |
145 | } else { | |
146 | /* make sure no hole in the middle */ | |
147 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
148 | return i; | |
149 | } | |
150 | } | |
151 | return -1; | |
152 | } | |
153 | ||
a9753cbd S |
154 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
155 | unsigned int sg_count, | |
156 | unsigned int len) | |
157 | { | |
158 | int i; | |
159 | int num_pages; | |
160 | struct scatterlist *bounce_sgl; | |
161 | struct page *page_buf; | |
162 | ||
163 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
164 | ||
165 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
166 | if (!bounce_sgl) | |
167 | return NULL; | |
168 | ||
169 | for (i = 0; i < num_pages; i++) { | |
170 | page_buf = alloc_page(GFP_ATOMIC); | |
171 | if (!page_buf) | |
172 | goto cleanup; | |
173 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
174 | } | |
175 | ||
176 | return bounce_sgl; | |
177 | ||
178 | cleanup: | |
179 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
180 | return NULL; | |
181 | } | |
182 | ||
29fe2c9b S |
183 | |
184 | /* Assume the original sgl has enough room */ | |
185 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
186 | struct scatterlist *bounce_sgl, | |
187 | unsigned int orig_sgl_count) | |
188 | { | |
189 | int i; | |
190 | int j = 0; | |
191 | unsigned long src, dest; | |
192 | unsigned int srclen, destlen, copylen; | |
193 | unsigned int total_copied = 0; | |
194 | unsigned long bounce_addr = 0; | |
195 | unsigned long dest_addr = 0; | |
196 | unsigned long flags; | |
197 | ||
198 | local_irq_save(flags); | |
199 | ||
200 | for (i = 0; i < orig_sgl_count; i++) { | |
201 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
202 | KM_IRQ0) + orig_sgl[i].offset; | |
203 | dest = dest_addr; | |
204 | destlen = orig_sgl[i].length; | |
205 | ||
206 | if (bounce_addr == 0) | |
207 | bounce_addr = | |
208 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
209 | KM_IRQ0); | |
210 | ||
211 | while (destlen) { | |
212 | src = bounce_addr + bounce_sgl[j].offset; | |
213 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
214 | ||
215 | copylen = min(srclen, destlen); | |
216 | memcpy((void *)dest, (void *)src, copylen); | |
217 | ||
218 | total_copied += copylen; | |
219 | bounce_sgl[j].offset += copylen; | |
220 | destlen -= copylen; | |
221 | dest += copylen; | |
222 | ||
223 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
224 | /* full */ | |
225 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
226 | j++; | |
227 | ||
228 | /* if we need to use another bounce buffer */ | |
229 | if (destlen || i != orig_sgl_count - 1) | |
230 | bounce_addr = | |
231 | (unsigned long)kmap_atomic( | |
232 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
233 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
234 | /* unmap the last bounce that is < PAGE_SIZE */ | |
235 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
236 | } | |
237 | } | |
238 | ||
239 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
240 | KM_IRQ0); | |
241 | } | |
242 | ||
243 | local_irq_restore(flags); | |
244 | ||
245 | return total_copied; | |
246 | } | |
247 | ||
6a8ff44b S |
248 | |
249 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
250 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
251 | struct scatterlist *bounce_sgl, | |
252 | unsigned int orig_sgl_count) | |
253 | { | |
254 | int i; | |
255 | int j = 0; | |
256 | unsigned long src, dest; | |
257 | unsigned int srclen, destlen, copylen; | |
258 | unsigned int total_copied = 0; | |
259 | unsigned long bounce_addr = 0; | |
260 | unsigned long src_addr = 0; | |
261 | unsigned long flags; | |
262 | ||
263 | local_irq_save(flags); | |
264 | ||
265 | for (i = 0; i < orig_sgl_count; i++) { | |
266 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
267 | KM_IRQ0) + orig_sgl[i].offset; | |
268 | src = src_addr; | |
269 | srclen = orig_sgl[i].length; | |
270 | ||
271 | if (bounce_addr == 0) | |
272 | bounce_addr = | |
273 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
274 | KM_IRQ0); | |
275 | ||
276 | while (srclen) { | |
277 | /* assume bounce offset always == 0 */ | |
278 | dest = bounce_addr + bounce_sgl[j].length; | |
279 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
280 | ||
281 | copylen = min(srclen, destlen); | |
282 | memcpy((void *)dest, (void *)src, copylen); | |
283 | ||
284 | total_copied += copylen; | |
285 | bounce_sgl[j].length += copylen; | |
286 | srclen -= copylen; | |
287 | src += copylen; | |
288 | ||
289 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
290 | /* full..move to next entry */ | |
291 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
292 | j++; | |
293 | ||
294 | /* if we need to use another bounce buffer */ | |
295 | if (srclen || i != orig_sgl_count - 1) | |
296 | bounce_addr = | |
297 | (unsigned long)kmap_atomic( | |
298 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
299 | ||
300 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
301 | /* unmap the last bounce that is < PAGE_SIZE */ | |
302 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
303 | } | |
304 | } | |
305 | ||
306 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
307 | } | |
308 | ||
309 | local_irq_restore(flags); | |
310 | ||
311 | return total_copied; | |
312 | } | |
313 | ||
5c5c0234 S |
314 | |
315 | /* | |
316 | * storvsc_remove - Callback when our device is removed | |
317 | */ | |
318 | static int storvsc_remove(struct hv_device *dev) | |
319 | { | |
5c5c0234 S |
320 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
321 | struct hv_host_device *host_dev = | |
322 | (struct hv_host_device *)host->hostdata; | |
323 | ||
324 | /* | |
325 | * Call to the vsc driver to let it know that the device is being | |
326 | * removed | |
327 | */ | |
6cdc57c0 | 328 | storvsc_dev_remove(dev); |
5c5c0234 S |
329 | |
330 | if (host_dev->request_pool) { | |
331 | kmem_cache_destroy(host_dev->request_pool); | |
332 | host_dev->request_pool = NULL; | |
333 | } | |
334 | ||
335 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
336 | scsi_remove_host(host); | |
337 | ||
338 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
339 | scsi_host_put(host); | |
340 | return 0; | |
341 | } | |
342 | ||
62838ce2 S |
343 | |
344 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
345 | sector_t capacity, int *info) | |
346 | { | |
5326fd5c S |
347 | sector_t nsect = capacity; |
348 | sector_t cylinders = nsect; | |
349 | int heads, sectors_pt; | |
62838ce2 | 350 | |
5326fd5c S |
351 | /* |
352 | * We are making up these values; let us keep it simple. | |
353 | */ | |
354 | heads = 0xff; | |
355 | sectors_pt = 0x3f; /* Sectors per track */ | |
356 | sector_div(cylinders, heads * sectors_pt); | |
357 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
358 | cylinders = 0xffff; | |
62838ce2 S |
359 | |
360 | info[0] = heads; | |
5326fd5c S |
361 | info[1] = sectors_pt; |
362 | info[2] = (int)cylinders; | |
62838ce2 | 363 | |
5326fd5c S |
364 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", (int)cylinders, heads, |
365 | sectors_pt); | |
62838ce2 S |
366 | |
367 | return 0; | |
368 | } | |
aa3d789e S |
369 | |
370 | static int storvsc_host_reset(struct hv_device *device) | |
371 | { | |
372 | struct storvsc_device *stor_device; | |
373 | struct hv_storvsc_request *request; | |
374 | struct vstor_packet *vstor_packet; | |
375 | int ret, t; | |
376 | ||
377 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
378 | ||
379 | stor_device = get_stor_device(device); | |
380 | if (!stor_device) | |
381 | return -1; | |
382 | ||
383 | request = &stor_device->reset_request; | |
384 | vstor_packet = &request->vstor_packet; | |
385 | ||
386 | init_completion(&request->wait_event); | |
387 | ||
388 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
389 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
390 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
391 | ||
392 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
393 | sizeof(struct vstor_packet), | |
394 | (unsigned long)&stor_device->reset_request, | |
395 | VM_PKT_DATA_INBAND, | |
396 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
397 | if (ret != 0) | |
398 | goto cleanup; | |
399 | ||
400 | t = wait_for_completion_timeout(&request->wait_event, HZ); | |
401 | if (t == 0) { | |
402 | ret = -ETIMEDOUT; | |
403 | goto cleanup; | |
404 | } | |
405 | ||
406 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
407 | ||
408 | /* | |
409 | * At this point, all outstanding requests in the adapter | |
410 | * should have been flushed out and return to us | |
411 | */ | |
412 | ||
413 | cleanup: | |
414 | put_stor_device(device); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | ||
96e690be S |
419 | /* |
420 | * storvsc_host_reset_handler - Reset the scsi HBA | |
421 | */ | |
422 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
423 | { | |
424 | int ret; | |
425 | struct hv_host_device *host_dev = | |
426 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
427 | struct hv_device *dev = host_dev->dev; | |
428 | ||
429 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", | |
430 | scmnd->device, dev); | |
431 | ||
432 | /* Invokes the vsc to reset the host/bus */ | |
433 | ret = storvsc_host_reset(dev); | |
434 | if (ret != 0) | |
435 | return ret; | |
436 | ||
437 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", | |
438 | scmnd->device, dev); | |
439 | ||
440 | return ret; | |
441 | } | |
442 | ||
8a411bad S |
443 | |
444 | /* | |
445 | * storvsc_commmand_completion - Command completion processing | |
446 | */ | |
447 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
448 | { | |
449 | struct storvsc_cmd_request *cmd_request = | |
450 | (struct storvsc_cmd_request *)request->context; | |
451 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
452 | struct hv_host_device *host_dev = | |
453 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
454 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
455 | struct scsi_sense_hdr sense_hdr; | |
456 | struct vmscsi_request *vm_srb; | |
457 | ||
8a411bad | 458 | if (cmd_request->bounce_sgl_count) { |
8a411bad S |
459 | |
460 | /* FIXME: We can optimize on writes by just skipping this */ | |
461 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
462 | cmd_request->bounce_sgl, | |
463 | scsi_sg_count(scmnd)); | |
464 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
465 | cmd_request->bounce_sgl_count); | |
466 | } | |
467 | ||
468 | vm_srb = &request->vstor_packet.vm_srb; | |
469 | scmnd->result = vm_srb->scsi_status; | |
470 | ||
471 | if (scmnd->result) { | |
472 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
473 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
474 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
475 | } | |
476 | ||
8a411bad S |
477 | scsi_set_resid(scmnd, |
478 | request->data_buffer.len - | |
479 | vm_srb->data_transfer_length); | |
480 | ||
481 | scsi_done_fn = scmnd->scsi_done; | |
482 | ||
483 | scmnd->host_scribble = NULL; | |
484 | scmnd->scsi_done = NULL; | |
485 | ||
486 | /* !!DO NOT MODIFY the scmnd after this call */ | |
487 | scsi_done_fn(scmnd); | |
488 | ||
489 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
490 | } | |
491 | ||
c5b463ae S |
492 | |
493 | /* | |
494 | * storvsc_queuecommand - Initiate command processing | |
495 | */ | |
496 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
497 | void (*done)(struct scsi_cmnd *)) | |
498 | { | |
499 | int ret; | |
500 | struct hv_host_device *host_dev = | |
501 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
502 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
503 | struct hv_storvsc_request *request; |
504 | struct storvsc_cmd_request *cmd_request; | |
505 | unsigned int request_size = 0; | |
506 | int i; | |
507 | struct scatterlist *sgl; | |
508 | unsigned int sg_count = 0; | |
509 | struct vmscsi_request *vm_srb; | |
510 | ||
511 | ||
512 | /* If retrying, no need to prep the cmd */ | |
513 | if (scmnd->host_scribble) { | |
c5b463ae S |
514 | |
515 | cmd_request = | |
516 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
517 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
518 | scmnd, cmd_request); | |
519 | ||
520 | goto retry_request; | |
521 | } | |
522 | ||
c5b463ae S |
523 | scmnd->scsi_done = done; |
524 | ||
525 | request_size = sizeof(struct storvsc_cmd_request); | |
526 | ||
527 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
528 | GFP_ATOMIC); | |
529 | if (!cmd_request) { | |
530 | scmnd->scsi_done = NULL; | |
531 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
532 | } | |
533 | ||
534 | /* Setup the cmd request */ | |
535 | cmd_request->bounce_sgl_count = 0; | |
536 | cmd_request->bounce_sgl = NULL; | |
537 | cmd_request->cmd = scmnd; | |
538 | ||
539 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
540 | ||
541 | request = &cmd_request->request; | |
542 | vm_srb = &request->vstor_packet.vm_srb; | |
543 | ||
544 | ||
545 | /* Build the SRB */ | |
546 | switch (scmnd->sc_data_direction) { | |
547 | case DMA_TO_DEVICE: | |
548 | vm_srb->data_in = WRITE_TYPE; | |
549 | break; | |
550 | case DMA_FROM_DEVICE: | |
551 | vm_srb->data_in = READ_TYPE; | |
552 | break; | |
553 | default: | |
554 | vm_srb->data_in = UNKNOWN_TYPE; | |
555 | break; | |
556 | } | |
557 | ||
558 | request->on_io_completion = storvsc_commmand_completion; | |
559 | request->context = cmd_request;/* scmnd; */ | |
560 | ||
c5b463ae S |
561 | vm_srb->port_number = host_dev->port; |
562 | vm_srb->path_id = scmnd->device->channel; | |
563 | vm_srb->target_id = scmnd->device->id; | |
564 | vm_srb->lun = scmnd->device->lun; | |
565 | ||
c5b463ae S |
566 | vm_srb->cdb_length = scmnd->cmd_len; |
567 | ||
568 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
569 | ||
570 | request->sense_buffer = scmnd->sense_buffer; | |
571 | ||
572 | ||
573 | request->data_buffer.len = scsi_bufflen(scmnd); | |
574 | if (scsi_sg_count(scmnd)) { | |
575 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
576 | sg_count = scsi_sg_count(scmnd); | |
577 | ||
578 | /* check if we need to bounce the sgl */ | |
579 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
580 | cmd_request->bounce_sgl = | |
581 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
582 | scsi_bufflen(scmnd)); | |
583 | if (!cmd_request->bounce_sgl) { | |
584 | scmnd->scsi_done = NULL; | |
585 | scmnd->host_scribble = NULL; | |
586 | kmem_cache_free(host_dev->request_pool, | |
587 | cmd_request); | |
588 | ||
589 | return SCSI_MLQUEUE_HOST_BUSY; | |
590 | } | |
591 | ||
592 | cmd_request->bounce_sgl_count = | |
593 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
594 | PAGE_SHIFT; | |
595 | ||
596 | /* | |
597 | * FIXME: We can optimize on reads by just skipping | |
598 | * this | |
599 | */ | |
600 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
601 | scsi_sg_count(scmnd)); | |
602 | ||
603 | sgl = cmd_request->bounce_sgl; | |
604 | sg_count = cmd_request->bounce_sgl_count; | |
605 | } | |
606 | ||
607 | request->data_buffer.offset = sgl[0].offset; | |
608 | ||
609 | for (i = 0; i < sg_count; i++) | |
610 | request->data_buffer.pfn_array[i] = | |
611 | page_to_pfn(sg_page((&sgl[i]))); | |
612 | ||
613 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
614 | request->data_buffer.offset = |
615 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
616 | request->data_buffer.pfn_array[0] = | |
617 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
618 | } | |
619 | ||
620 | retry_request: | |
621 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
622 | ret = storvsc_do_io(dev, &cmd_request->request); |
623 | ||
c5b463ae S |
624 | if (ret == -1) { |
625 | /* no more space */ | |
626 | ||
627 | if (cmd_request->bounce_sgl_count) { | |
628 | /* | |
629 | * FIXME: We can optimize on writes by just skipping | |
630 | * this | |
631 | */ | |
632 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
633 | cmd_request->bounce_sgl, | |
634 | scsi_sg_count(scmnd)); | |
635 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
636 | cmd_request->bounce_sgl_count); | |
637 | } | |
638 | ||
639 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
640 | ||
641 | scmnd->scsi_done = NULL; | |
642 | scmnd->host_scribble = NULL; | |
643 | ||
644 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
645 | } | |
646 | ||
647 | return ret; | |
648 | } | |
649 | ||
650 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
651 | ||
bef4a34a | 652 | |
454f18a9 | 653 | /* Scsi driver */ |
bef4a34a | 654 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
655 | .module = THIS_MODULE, |
656 | .name = "storvsc_host_t", | |
657 | .bios_param = storvsc_get_chs, | |
658 | .queuecommand = storvsc_queuecommand, | |
659 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
660 | .slave_alloc = storvsc_device_alloc, | |
661 | .slave_configure = storvsc_device_configure, | |
662 | .cmd_per_lun = 1, | |
663 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 664 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 665 | .this_id = -1, |
454f18a9 | 666 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
667 | /* currently 32 */ |
668 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
669 | /* | |
670 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
671 | * into 1 sg element. If set, we must limit the max_segment_size to | |
672 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
673 | * multiple | |
674 | */ | |
454f18a9 | 675 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 676 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 677 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 678 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
679 | }; |
680 | ||
681 | ||
3e189519 | 682 | /* |
ff568d3a GKH |
683 | * storvsc_probe - Add a new device for this driver |
684 | */ | |
f5c78872 | 685 | |
9efd21e1 | 686 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 687 | { |
ff568d3a | 688 | int ret; |
bef4a34a | 689 | struct Scsi_Host *host; |
795b613d | 690 | struct hv_host_device *host_dev; |
9f0c7d2c | 691 | struct storvsc_device_info device_info; |
bef4a34a | 692 | |
ff568d3a | 693 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 694 | sizeof(struct hv_host_device)); |
f8feed06 | 695 | if (!host) |
bef4a34a | 696 | return -ENOMEM; |
bef4a34a | 697 | |
9efd21e1 | 698 | dev_set_drvdata(&device->device, host); |
bef4a34a | 699 | |
795b613d S |
700 | host_dev = (struct hv_host_device *)host->hostdata; |
701 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 702 | |
795b613d | 703 | host_dev->port = host->host_no; |
97c15296 | 704 | host_dev->dev = device; |
bef4a34a | 705 | |
795b613d | 706 | host_dev->request_pool = |
9efd21e1 | 707 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 708 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
709 | SLAB_HWCACHE_ALIGN, NULL); |
710 | ||
795b613d | 711 | if (!host_dev->request_pool) { |
bef4a34a | 712 | scsi_host_put(host); |
bef4a34a HJ |
713 | return -ENOMEM; |
714 | } | |
715 | ||
8a046024 | 716 | device_info.port_number = host->host_no; |
fa4d123a | 717 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 718 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 719 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 720 | |
ff568d3a | 721 | if (ret != 0) { |
795b613d | 722 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 723 | scsi_host_put(host); |
bef4a34a HJ |
724 | return -1; |
725 | } | |
726 | ||
795b613d S |
727 | host_dev->path = device_info.path_id; |
728 | host_dev->target = device_info.target_id; | |
bef4a34a | 729 | |
ff568d3a GKH |
730 | /* max # of devices per target */ |
731 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
732 | /* max # of targets per channel */ | |
733 | host->max_id = STORVSC_MAX_TARGETS; | |
734 | /* max # of channels */ | |
735 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 736 | |
454f18a9 | 737 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 738 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 739 | if (ret != 0) { |
bef4a34a | 740 | |
6cdc57c0 | 741 | storvsc_dev_remove(device); |
bef4a34a | 742 | |
795b613d | 743 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 744 | scsi_host_put(host); |
bef4a34a HJ |
745 | return -1; |
746 | } | |
747 | ||
748 | scsi_scan_host(host); | |
bef4a34a HJ |
749 | return ret; |
750 | } | |
751 | ||
7bd05b91 S |
752 | /* The one and only one */ |
753 | ||
39ae6fae S |
754 | static struct storvsc_driver storvsc_drv = { |
755 | .base.probe = storvsc_probe, | |
756 | .base.remove = storvsc_remove, | |
757 | }; | |
7bd05b91 S |
758 | |
759 | ||
f5c78872 S |
760 | /* |
761 | * storvsc_drv_init - StorVsc driver initialization. | |
762 | */ | |
763 | static int storvsc_drv_init(void) | |
764 | { | |
765 | int ret; | |
565c38de | 766 | struct hv_driver *drv = &storvsc_drv.base; |
01415ab3 S |
767 | u32 max_outstanding_req_per_channel; |
768 | ||
769 | /* | |
770 | * Divide the ring buffer data size (which is 1 page less | |
771 | * than the ring buffer size since that page is reserved for | |
772 | * the ring buffer indices) by the max request size (which is | |
773 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
774 | */ | |
775 | ||
776 | max_outstanding_req_per_channel = | |
777 | ((storvsc_ringbuffer_size - PAGE_SIZE) / | |
778 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
779 | sizeof(struct vstor_packet) + sizeof(u64), | |
780 | sizeof(u64))); | |
f5c78872 | 781 | |
1a96d9a4 S |
782 | memcpy(&drv->dev_type, &gStorVscDeviceType, |
783 | sizeof(struct hv_guid)); | |
784 | ||
01415ab3 | 785 | if (max_outstanding_req_per_channel < |
f5c78872 S |
786 | STORVSC_MAX_IO_REQUESTS) |
787 | return -1; | |
788 | ||
4742e82f | 789 | drv->name = driver_name; |
206cf17b | 790 | drv->driver.name = driver_name; |
f5c78872 | 791 | |
f5c78872 S |
792 | |
793 | /* The driver belongs to vmbus */ | |
794 | ret = vmbus_child_driver_register(&drv->driver); | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
799 | static int storvsc_drv_exit_cb(struct device *dev, void *data) | |
800 | { | |
801 | struct device **curr = (struct device **)data; | |
802 | *curr = dev; | |
803 | return 1; /* stop iterating */ | |
804 | } | |
805 | ||
806 | static void storvsc_drv_exit(void) | |
807 | { | |
565c38de | 808 | struct hv_driver *drv = &storvsc_drv.base; |
f5c78872 S |
809 | struct device *current_dev = NULL; |
810 | int ret; | |
811 | ||
812 | while (1) { | |
813 | current_dev = NULL; | |
814 | ||
815 | /* Get the device */ | |
816 | ret = driver_for_each_device(&drv->driver, NULL, | |
817 | (void *) ¤t_dev, | |
818 | storvsc_drv_exit_cb); | |
819 | ||
820 | ||
821 | if (current_dev == NULL) | |
822 | break; | |
823 | ||
824 | /* Initiate removal from the top-down */ | |
825 | device_unregister(current_dev); | |
826 | } | |
827 | ||
f5c78872 S |
828 | vmbus_child_driver_unregister(&drv->driver); |
829 | return; | |
830 | } | |
831 | ||
bef4a34a HJ |
832 | static int __init storvsc_init(void) |
833 | { | |
834 | int ret; | |
835 | ||
bef4a34a | 836 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 837 | ret = storvsc_drv_init(); |
bef4a34a HJ |
838 | return ret; |
839 | } | |
840 | ||
841 | static void __exit storvsc_exit(void) | |
842 | { | |
bef4a34a | 843 | storvsc_drv_exit(); |
bef4a34a HJ |
844 | } |
845 | ||
ff568d3a | 846 | MODULE_LICENSE("GPL"); |
26c14cc1 | 847 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 848 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
849 | module_init(storvsc_init); |
850 | module_exit(storvsc_exit); |