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 | |
6dec2442 | 77 | /* |
cf6fdfb3 | 78 | * storvsc_initialize - Main entry point |
6dec2442 | 79 | */ |
cf6fdfb3 | 80 | static int storvsc_initialize(struct hv_driver *driver) |
6dec2442 | 81 | { |
2e79505d | 82 | struct storvsc_driver *stor_driver; |
6dec2442 | 83 | |
ced01b0d | 84 | stor_driver = hvdr_to_stordr(driver); |
6dec2442 | 85 | |
6dec2442 S |
86 | |
87 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
88 | ||
0f0cdc6a | 89 | driver->name = driver_name; |
6dec2442 S |
90 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
91 | sizeof(struct hv_guid)); | |
92 | ||
6dec2442 S |
93 | |
94 | /* | |
95 | * Divide the ring buffer data size (which is 1 page less | |
96 | * than the ring buffer size since that page is reserved for | |
97 | * the ring buffer indices) by the max request size (which is | |
98 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
99 | */ | |
100 | stor_driver->max_outstanding_req_per_channel = | |
101 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
102 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
103 | sizeof(struct vstor_packet) + sizeof(u64), | |
104 | sizeof(u64))); | |
105 | ||
106 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
107 | stor_driver->max_outstanding_req_per_channel, | |
108 | STORVSC_MAX_IO_REQUESTS); | |
109 | ||
110 | /* Setup the dispatch table */ | |
2ac5dad1 | 111 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 112 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 113 | |
bb465926 | 114 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
115 | |
116 | return 0; | |
117 | } | |
118 | ||
5b60acee S |
119 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
120 | { | |
121 | /* | |
122 | * This enables luns to be located sparsely. Otherwise, we may not | |
123 | * discovered them. | |
124 | */ | |
125 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
126 | return 0; | |
127 | } | |
128 | ||
a1ebfeae S |
129 | static int storvsc_merge_bvec(struct request_queue *q, |
130 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
131 | { | |
132 | /* checking done by caller. */ | |
133 | return bvec->bv_len; | |
134 | } | |
135 | ||
419f2d03 S |
136 | static int storvsc_device_configure(struct scsi_device *sdevice) |
137 | { | |
138 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
139 | STORVSC_MAX_IO_REQUESTS); | |
140 | ||
141 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", | |
142 | sdevice, PAGE_SIZE); | |
143 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); | |
144 | ||
145 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", | |
146 | sdevice); | |
147 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
148 | ||
149 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
49a3c7a9 S |
154 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
155 | unsigned int sg_count) | |
156 | { | |
157 | int i; | |
158 | struct page *page_buf; | |
159 | ||
160 | for (i = 0; i < sg_count; i++) { | |
161 | page_buf = sg_page((&sgl[i])); | |
162 | if (page_buf != NULL) | |
163 | __free_page(page_buf); | |
164 | } | |
165 | ||
166 | kfree(sgl); | |
167 | } | |
168 | ||
3862ef3e S |
169 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
170 | { | |
171 | int i; | |
172 | ||
173 | /* No need to check */ | |
174 | if (sg_count < 2) | |
175 | return -1; | |
176 | ||
177 | /* We have at least 2 sg entries */ | |
178 | for (i = 0; i < sg_count; i++) { | |
179 | if (i == 0) { | |
180 | /* make sure 1st one does not have hole */ | |
181 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
182 | return i; | |
183 | } else if (i == sg_count - 1) { | |
184 | /* make sure last one does not have hole */ | |
185 | if (sgl[i].offset != 0) | |
186 | return i; | |
187 | } else { | |
188 | /* make sure no hole in the middle */ | |
189 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
190 | return i; | |
191 | } | |
192 | } | |
193 | return -1; | |
194 | } | |
195 | ||
a9753cbd S |
196 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
197 | unsigned int sg_count, | |
198 | unsigned int len) | |
199 | { | |
200 | int i; | |
201 | int num_pages; | |
202 | struct scatterlist *bounce_sgl; | |
203 | struct page *page_buf; | |
204 | ||
205 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
206 | ||
207 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
208 | if (!bounce_sgl) | |
209 | return NULL; | |
210 | ||
211 | for (i = 0; i < num_pages; i++) { | |
212 | page_buf = alloc_page(GFP_ATOMIC); | |
213 | if (!page_buf) | |
214 | goto cleanup; | |
215 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
216 | } | |
217 | ||
218 | return bounce_sgl; | |
219 | ||
220 | cleanup: | |
221 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
222 | return NULL; | |
223 | } | |
224 | ||
29fe2c9b S |
225 | |
226 | /* Assume the original sgl has enough room */ | |
227 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
228 | struct scatterlist *bounce_sgl, | |
229 | unsigned int orig_sgl_count) | |
230 | { | |
231 | int i; | |
232 | int j = 0; | |
233 | unsigned long src, dest; | |
234 | unsigned int srclen, destlen, copylen; | |
235 | unsigned int total_copied = 0; | |
236 | unsigned long bounce_addr = 0; | |
237 | unsigned long dest_addr = 0; | |
238 | unsigned long flags; | |
239 | ||
240 | local_irq_save(flags); | |
241 | ||
242 | for (i = 0; i < orig_sgl_count; i++) { | |
243 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
244 | KM_IRQ0) + orig_sgl[i].offset; | |
245 | dest = dest_addr; | |
246 | destlen = orig_sgl[i].length; | |
247 | ||
248 | if (bounce_addr == 0) | |
249 | bounce_addr = | |
250 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
251 | KM_IRQ0); | |
252 | ||
253 | while (destlen) { | |
254 | src = bounce_addr + bounce_sgl[j].offset; | |
255 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
256 | ||
257 | copylen = min(srclen, destlen); | |
258 | memcpy((void *)dest, (void *)src, copylen); | |
259 | ||
260 | total_copied += copylen; | |
261 | bounce_sgl[j].offset += copylen; | |
262 | destlen -= copylen; | |
263 | dest += copylen; | |
264 | ||
265 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
266 | /* full */ | |
267 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
268 | j++; | |
269 | ||
270 | /* if we need to use another bounce buffer */ | |
271 | if (destlen || i != orig_sgl_count - 1) | |
272 | bounce_addr = | |
273 | (unsigned long)kmap_atomic( | |
274 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
275 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
276 | /* unmap the last bounce that is < PAGE_SIZE */ | |
277 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
278 | } | |
279 | } | |
280 | ||
281 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
282 | KM_IRQ0); | |
283 | } | |
284 | ||
285 | local_irq_restore(flags); | |
286 | ||
287 | return total_copied; | |
288 | } | |
289 | ||
6a8ff44b S |
290 | |
291 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
292 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
293 | struct scatterlist *bounce_sgl, | |
294 | unsigned int orig_sgl_count) | |
295 | { | |
296 | int i; | |
297 | int j = 0; | |
298 | unsigned long src, dest; | |
299 | unsigned int srclen, destlen, copylen; | |
300 | unsigned int total_copied = 0; | |
301 | unsigned long bounce_addr = 0; | |
302 | unsigned long src_addr = 0; | |
303 | unsigned long flags; | |
304 | ||
305 | local_irq_save(flags); | |
306 | ||
307 | for (i = 0; i < orig_sgl_count; i++) { | |
308 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
309 | KM_IRQ0) + orig_sgl[i].offset; | |
310 | src = src_addr; | |
311 | srclen = orig_sgl[i].length; | |
312 | ||
313 | if (bounce_addr == 0) | |
314 | bounce_addr = | |
315 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
316 | KM_IRQ0); | |
317 | ||
318 | while (srclen) { | |
319 | /* assume bounce offset always == 0 */ | |
320 | dest = bounce_addr + bounce_sgl[j].length; | |
321 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
322 | ||
323 | copylen = min(srclen, destlen); | |
324 | memcpy((void *)dest, (void *)src, copylen); | |
325 | ||
326 | total_copied += copylen; | |
327 | bounce_sgl[j].length += copylen; | |
328 | srclen -= copylen; | |
329 | src += copylen; | |
330 | ||
331 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
332 | /* full..move to next entry */ | |
333 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
334 | j++; | |
335 | ||
336 | /* if we need to use another bounce buffer */ | |
337 | if (srclen || i != orig_sgl_count - 1) | |
338 | bounce_addr = | |
339 | (unsigned long)kmap_atomic( | |
340 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
341 | ||
342 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
343 | /* unmap the last bounce that is < PAGE_SIZE */ | |
344 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
345 | } | |
346 | } | |
347 | ||
348 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
349 | } | |
350 | ||
351 | local_irq_restore(flags); | |
352 | ||
353 | return total_copied; | |
354 | } | |
355 | ||
5c5c0234 S |
356 | |
357 | /* | |
358 | * storvsc_remove - Callback when our device is removed | |
359 | */ | |
360 | static int storvsc_remove(struct hv_device *dev) | |
361 | { | |
5c5c0234 S |
362 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
363 | struct hv_host_device *host_dev = | |
364 | (struct hv_host_device *)host->hostdata; | |
365 | ||
366 | /* | |
367 | * Call to the vsc driver to let it know that the device is being | |
368 | * removed | |
369 | */ | |
6cdc57c0 | 370 | storvsc_dev_remove(dev); |
5c5c0234 S |
371 | |
372 | if (host_dev->request_pool) { | |
373 | kmem_cache_destroy(host_dev->request_pool); | |
374 | host_dev->request_pool = NULL; | |
375 | } | |
376 | ||
377 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
378 | scsi_remove_host(host); | |
379 | ||
380 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
381 | scsi_host_put(host); | |
382 | return 0; | |
383 | } | |
384 | ||
62838ce2 S |
385 | |
386 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
387 | sector_t capacity, int *info) | |
388 | { | |
389 | sector_t total_sectors = capacity; | |
390 | sector_t cylinder_times_heads = 0; | |
391 | sector_t temp = 0; | |
392 | ||
393 | int sectors_per_track = 0; | |
394 | int heads = 0; | |
395 | int cylinders = 0; | |
396 | int rem = 0; | |
397 | ||
398 | if (total_sectors > (65535 * 16 * 255)) | |
399 | total_sectors = (65535 * 16 * 255); | |
400 | ||
401 | if (total_sectors >= (65535 * 16 * 63)) { | |
402 | sectors_per_track = 255; | |
403 | heads = 16; | |
404 | ||
405 | cylinder_times_heads = total_sectors; | |
406 | /* sector_div stores the quotient in cylinder_times_heads */ | |
407 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
408 | } else { | |
409 | sectors_per_track = 17; | |
410 | ||
411 | cylinder_times_heads = total_sectors; | |
412 | /* sector_div stores the quotient in cylinder_times_heads */ | |
413 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
414 | ||
415 | temp = cylinder_times_heads + 1023; | |
416 | /* sector_div stores the quotient in temp */ | |
417 | rem = sector_div(temp, 1024); | |
418 | ||
419 | heads = temp; | |
420 | ||
421 | if (heads < 4) | |
422 | heads = 4; | |
423 | ||
424 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { | |
425 | sectors_per_track = 31; | |
426 | heads = 16; | |
427 | ||
428 | cylinder_times_heads = total_sectors; | |
429 | /* | |
430 | * sector_div stores the quotient in | |
431 | * cylinder_times_heads | |
432 | */ | |
433 | rem = sector_div(cylinder_times_heads, | |
434 | sectors_per_track); | |
435 | } | |
436 | ||
437 | if (cylinder_times_heads >= (heads * 1024)) { | |
438 | sectors_per_track = 63; | |
439 | heads = 16; | |
440 | ||
441 | cylinder_times_heads = total_sectors; | |
442 | /* | |
443 | * sector_div stores the quotient in | |
444 | * cylinder_times_heads | |
445 | */ | |
446 | rem = sector_div(cylinder_times_heads, | |
447 | sectors_per_track); | |
448 | } | |
449 | } | |
450 | ||
451 | temp = cylinder_times_heads; | |
452 | /* sector_div stores the quotient in temp */ | |
453 | rem = sector_div(temp, heads); | |
454 | cylinders = temp; | |
455 | ||
456 | info[0] = heads; | |
457 | info[1] = sectors_per_track; | |
458 | info[2] = cylinders; | |
459 | ||
460 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, | |
461 | sectors_per_track); | |
462 | ||
463 | return 0; | |
464 | } | |
aa3d789e S |
465 | |
466 | static int storvsc_host_reset(struct hv_device *device) | |
467 | { | |
468 | struct storvsc_device *stor_device; | |
469 | struct hv_storvsc_request *request; | |
470 | struct vstor_packet *vstor_packet; | |
471 | int ret, t; | |
472 | ||
473 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
474 | ||
475 | stor_device = get_stor_device(device); | |
476 | if (!stor_device) | |
477 | return -1; | |
478 | ||
479 | request = &stor_device->reset_request; | |
480 | vstor_packet = &request->vstor_packet; | |
481 | ||
482 | init_completion(&request->wait_event); | |
483 | ||
484 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
485 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
486 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
487 | ||
488 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
489 | sizeof(struct vstor_packet), | |
490 | (unsigned long)&stor_device->reset_request, | |
491 | VM_PKT_DATA_INBAND, | |
492 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
493 | if (ret != 0) | |
494 | goto cleanup; | |
495 | ||
496 | t = wait_for_completion_timeout(&request->wait_event, HZ); | |
497 | if (t == 0) { | |
498 | ret = -ETIMEDOUT; | |
499 | goto cleanup; | |
500 | } | |
501 | ||
502 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
503 | ||
504 | /* | |
505 | * At this point, all outstanding requests in the adapter | |
506 | * should have been flushed out and return to us | |
507 | */ | |
508 | ||
509 | cleanup: | |
510 | put_stor_device(device); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | ||
96e690be S |
515 | /* |
516 | * storvsc_host_reset_handler - Reset the scsi HBA | |
517 | */ | |
518 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
519 | { | |
520 | int ret; | |
521 | struct hv_host_device *host_dev = | |
522 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
523 | struct hv_device *dev = host_dev->dev; | |
524 | ||
525 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", | |
526 | scmnd->device, dev); | |
527 | ||
528 | /* Invokes the vsc to reset the host/bus */ | |
529 | ret = storvsc_host_reset(dev); | |
530 | if (ret != 0) | |
531 | return ret; | |
532 | ||
533 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", | |
534 | scmnd->device, dev); | |
535 | ||
536 | return ret; | |
537 | } | |
538 | ||
8a411bad S |
539 | |
540 | /* | |
541 | * storvsc_commmand_completion - Command completion processing | |
542 | */ | |
543 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
544 | { | |
545 | struct storvsc_cmd_request *cmd_request = | |
546 | (struct storvsc_cmd_request *)request->context; | |
547 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
548 | struct hv_host_device *host_dev = | |
549 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
550 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
551 | struct scsi_sense_hdr sense_hdr; | |
552 | struct vmscsi_request *vm_srb; | |
553 | ||
8a411bad | 554 | if (cmd_request->bounce_sgl_count) { |
8a411bad S |
555 | |
556 | /* FIXME: We can optimize on writes by just skipping this */ | |
557 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
558 | cmd_request->bounce_sgl, | |
559 | scsi_sg_count(scmnd)); | |
560 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
561 | cmd_request->bounce_sgl_count); | |
562 | } | |
563 | ||
564 | vm_srb = &request->vstor_packet.vm_srb; | |
565 | scmnd->result = vm_srb->scsi_status; | |
566 | ||
567 | if (scmnd->result) { | |
568 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
569 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
570 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
571 | } | |
572 | ||
8a411bad S |
573 | scsi_set_resid(scmnd, |
574 | request->data_buffer.len - | |
575 | vm_srb->data_transfer_length); | |
576 | ||
577 | scsi_done_fn = scmnd->scsi_done; | |
578 | ||
579 | scmnd->host_scribble = NULL; | |
580 | scmnd->scsi_done = NULL; | |
581 | ||
582 | /* !!DO NOT MODIFY the scmnd after this call */ | |
583 | scsi_done_fn(scmnd); | |
584 | ||
585 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
586 | } | |
587 | ||
c5b463ae S |
588 | |
589 | /* | |
590 | * storvsc_queuecommand - Initiate command processing | |
591 | */ | |
592 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
593 | void (*done)(struct scsi_cmnd *)) | |
594 | { | |
595 | int ret; | |
596 | struct hv_host_device *host_dev = | |
597 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
598 | struct hv_device *dev = host_dev->dev; | |
599 | struct storvsc_driver *storvsc_drv_obj = | |
600 | drv_to_stordrv(dev->device.driver); | |
601 | struct hv_storvsc_request *request; | |
602 | struct storvsc_cmd_request *cmd_request; | |
603 | unsigned int request_size = 0; | |
604 | int i; | |
605 | struct scatterlist *sgl; | |
606 | unsigned int sg_count = 0; | |
607 | struct vmscsi_request *vm_srb; | |
608 | ||
609 | ||
610 | /* If retrying, no need to prep the cmd */ | |
611 | if (scmnd->host_scribble) { | |
c5b463ae S |
612 | |
613 | cmd_request = | |
614 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
615 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
616 | scmnd, cmd_request); | |
617 | ||
618 | goto retry_request; | |
619 | } | |
620 | ||
c5b463ae S |
621 | scmnd->scsi_done = done; |
622 | ||
623 | request_size = sizeof(struct storvsc_cmd_request); | |
624 | ||
625 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
626 | GFP_ATOMIC); | |
627 | if (!cmd_request) { | |
628 | scmnd->scsi_done = NULL; | |
629 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
630 | } | |
631 | ||
632 | /* Setup the cmd request */ | |
633 | cmd_request->bounce_sgl_count = 0; | |
634 | cmd_request->bounce_sgl = NULL; | |
635 | cmd_request->cmd = scmnd; | |
636 | ||
637 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
638 | ||
639 | request = &cmd_request->request; | |
640 | vm_srb = &request->vstor_packet.vm_srb; | |
641 | ||
642 | ||
643 | /* Build the SRB */ | |
644 | switch (scmnd->sc_data_direction) { | |
645 | case DMA_TO_DEVICE: | |
646 | vm_srb->data_in = WRITE_TYPE; | |
647 | break; | |
648 | case DMA_FROM_DEVICE: | |
649 | vm_srb->data_in = READ_TYPE; | |
650 | break; | |
651 | default: | |
652 | vm_srb->data_in = UNKNOWN_TYPE; | |
653 | break; | |
654 | } | |
655 | ||
656 | request->on_io_completion = storvsc_commmand_completion; | |
657 | request->context = cmd_request;/* scmnd; */ | |
658 | ||
c5b463ae S |
659 | vm_srb->port_number = host_dev->port; |
660 | vm_srb->path_id = scmnd->device->channel; | |
661 | vm_srb->target_id = scmnd->device->id; | |
662 | vm_srb->lun = scmnd->device->lun; | |
663 | ||
c5b463ae S |
664 | vm_srb->cdb_length = scmnd->cmd_len; |
665 | ||
666 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
667 | ||
668 | request->sense_buffer = scmnd->sense_buffer; | |
669 | ||
670 | ||
671 | request->data_buffer.len = scsi_bufflen(scmnd); | |
672 | if (scsi_sg_count(scmnd)) { | |
673 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
674 | sg_count = scsi_sg_count(scmnd); | |
675 | ||
676 | /* check if we need to bounce the sgl */ | |
677 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
678 | cmd_request->bounce_sgl = | |
679 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
680 | scsi_bufflen(scmnd)); | |
681 | if (!cmd_request->bounce_sgl) { | |
682 | scmnd->scsi_done = NULL; | |
683 | scmnd->host_scribble = NULL; | |
684 | kmem_cache_free(host_dev->request_pool, | |
685 | cmd_request); | |
686 | ||
687 | return SCSI_MLQUEUE_HOST_BUSY; | |
688 | } | |
689 | ||
690 | cmd_request->bounce_sgl_count = | |
691 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
692 | PAGE_SHIFT; | |
693 | ||
694 | /* | |
695 | * FIXME: We can optimize on reads by just skipping | |
696 | * this | |
697 | */ | |
698 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
699 | scsi_sg_count(scmnd)); | |
700 | ||
701 | sgl = cmd_request->bounce_sgl; | |
702 | sg_count = cmd_request->bounce_sgl_count; | |
703 | } | |
704 | ||
705 | request->data_buffer.offset = sgl[0].offset; | |
706 | ||
707 | for (i = 0; i < sg_count; i++) | |
708 | request->data_buffer.pfn_array[i] = | |
709 | page_to_pfn(sg_page((&sgl[i]))); | |
710 | ||
711 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
712 | request->data_buffer.offset = |
713 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
714 | request->data_buffer.pfn_array[0] = | |
715 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
716 | } | |
717 | ||
718 | retry_request: | |
719 | /* Invokes the vsc to start an IO */ | |
720 | ret = storvsc_drv_obj->on_io_request(dev, | |
721 | &cmd_request->request); | |
722 | if (ret == -1) { | |
723 | /* no more space */ | |
724 | ||
725 | if (cmd_request->bounce_sgl_count) { | |
726 | /* | |
727 | * FIXME: We can optimize on writes by just skipping | |
728 | * this | |
729 | */ | |
730 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
731 | cmd_request->bounce_sgl, | |
732 | scsi_sg_count(scmnd)); | |
733 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
734 | cmd_request->bounce_sgl_count); | |
735 | } | |
736 | ||
737 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
738 | ||
739 | scmnd->scsi_done = NULL; | |
740 | scmnd->host_scribble = NULL; | |
741 | ||
742 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
743 | } | |
744 | ||
745 | return ret; | |
746 | } | |
747 | ||
748 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
749 | ||
bef4a34a | 750 | |
454f18a9 | 751 | /* Scsi driver */ |
bef4a34a | 752 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
753 | .module = THIS_MODULE, |
754 | .name = "storvsc_host_t", | |
755 | .bios_param = storvsc_get_chs, | |
756 | .queuecommand = storvsc_queuecommand, | |
757 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
758 | .slave_alloc = storvsc_device_alloc, | |
759 | .slave_configure = storvsc_device_configure, | |
760 | .cmd_per_lun = 1, | |
761 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 762 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 763 | .this_id = -1, |
454f18a9 | 764 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
765 | /* currently 32 */ |
766 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
767 | /* | |
768 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
769 | * into 1 sg element. If set, we must limit the max_segment_size to | |
770 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
771 | * multiple | |
772 | */ | |
454f18a9 | 773 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 774 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 775 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 776 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
777 | }; |
778 | ||
779 | ||
3e189519 | 780 | /* |
ff568d3a GKH |
781 | * storvsc_probe - Add a new device for this driver |
782 | */ | |
f5c78872 | 783 | |
9efd21e1 | 784 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 785 | { |
ff568d3a | 786 | int ret; |
bef4a34a | 787 | struct Scsi_Host *host; |
795b613d | 788 | struct hv_host_device *host_dev; |
9f0c7d2c | 789 | struct storvsc_device_info device_info; |
bef4a34a | 790 | |
ff568d3a | 791 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 792 | sizeof(struct hv_host_device)); |
f8feed06 | 793 | if (!host) |
bef4a34a | 794 | return -ENOMEM; |
bef4a34a | 795 | |
9efd21e1 | 796 | dev_set_drvdata(&device->device, host); |
bef4a34a | 797 | |
795b613d S |
798 | host_dev = (struct hv_host_device *)host->hostdata; |
799 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 800 | |
795b613d | 801 | host_dev->port = host->host_no; |
97c15296 | 802 | host_dev->dev = device; |
bef4a34a | 803 | |
795b613d | 804 | host_dev->request_pool = |
9efd21e1 | 805 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 806 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
807 | SLAB_HWCACHE_ALIGN, NULL); |
808 | ||
795b613d | 809 | if (!host_dev->request_pool) { |
bef4a34a | 810 | scsi_host_put(host); |
bef4a34a HJ |
811 | return -ENOMEM; |
812 | } | |
813 | ||
8a046024 | 814 | device_info.port_number = host->host_no; |
454f18a9 | 815 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 816 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 817 | |
ff568d3a | 818 | if (ret != 0) { |
795b613d | 819 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 820 | scsi_host_put(host); |
bef4a34a HJ |
821 | return -1; |
822 | } | |
823 | ||
795b613d S |
824 | host_dev->path = device_info.path_id; |
825 | host_dev->target = device_info.target_id; | |
bef4a34a | 826 | |
ff568d3a GKH |
827 | /* max # of devices per target */ |
828 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
829 | /* max # of targets per channel */ | |
830 | host->max_id = STORVSC_MAX_TARGETS; | |
831 | /* max # of channels */ | |
832 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 833 | |
454f18a9 | 834 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 835 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 836 | if (ret != 0) { |
bef4a34a | 837 | |
6cdc57c0 | 838 | storvsc_dev_remove(device); |
bef4a34a | 839 | |
795b613d | 840 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 841 | scsi_host_put(host); |
bef4a34a HJ |
842 | return -1; |
843 | } | |
844 | ||
845 | scsi_scan_host(host); | |
bef4a34a HJ |
846 | return ret; |
847 | } | |
848 | ||
7bd05b91 S |
849 | /* The one and only one */ |
850 | ||
39ae6fae S |
851 | static struct storvsc_driver storvsc_drv = { |
852 | .base.probe = storvsc_probe, | |
853 | .base.remove = storvsc_remove, | |
854 | }; | |
7bd05b91 S |
855 | |
856 | ||
f5c78872 S |
857 | /* |
858 | * storvsc_drv_init - StorVsc driver initialization. | |
859 | */ | |
860 | static int storvsc_drv_init(void) | |
861 | { | |
862 | int ret; | |
565c38de S |
863 | struct storvsc_driver *storvsc_drv_obj = &storvsc_drv; |
864 | struct hv_driver *drv = &storvsc_drv.base; | |
f5c78872 S |
865 | |
866 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; | |
867 | ||
868 | /* Callback to client driver to complete the initialization */ | |
869 | storvsc_initialize(&storvsc_drv_obj->base); | |
870 | ||
871 | DPRINT_INFO(STORVSC_DRV, | |
872 | "max outstanding reqs %u", | |
873 | storvsc_drv_obj->max_outstanding_req_per_channel); | |
874 | ||
875 | if (storvsc_drv_obj->max_outstanding_req_per_channel < | |
876 | STORVSC_MAX_IO_REQUESTS) | |
877 | return -1; | |
878 | ||
879 | drv->driver.name = storvsc_drv_obj->base.name; | |
880 | ||
f5c78872 S |
881 | |
882 | /* The driver belongs to vmbus */ | |
883 | ret = vmbus_child_driver_register(&drv->driver); | |
884 | ||
885 | return ret; | |
886 | } | |
887 | ||
888 | static int storvsc_drv_exit_cb(struct device *dev, void *data) | |
889 | { | |
890 | struct device **curr = (struct device **)data; | |
891 | *curr = dev; | |
892 | return 1; /* stop iterating */ | |
893 | } | |
894 | ||
895 | static void storvsc_drv_exit(void) | |
896 | { | |
565c38de S |
897 | struct storvsc_driver *storvsc_drv_obj = &storvsc_drv; |
898 | struct hv_driver *drv = &storvsc_drv.base; | |
f5c78872 S |
899 | struct device *current_dev = NULL; |
900 | int ret; | |
901 | ||
902 | while (1) { | |
903 | current_dev = NULL; | |
904 | ||
905 | /* Get the device */ | |
906 | ret = driver_for_each_device(&drv->driver, NULL, | |
907 | (void *) ¤t_dev, | |
908 | storvsc_drv_exit_cb); | |
909 | ||
910 | ||
911 | if (current_dev == NULL) | |
912 | break; | |
913 | ||
914 | /* Initiate removal from the top-down */ | |
915 | device_unregister(current_dev); | |
916 | } | |
917 | ||
918 | if (storvsc_drv_obj->base.cleanup) | |
919 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
920 | ||
921 | vmbus_child_driver_unregister(&drv->driver); | |
922 | return; | |
923 | } | |
924 | ||
bef4a34a HJ |
925 | static int __init storvsc_init(void) |
926 | { | |
927 | int ret; | |
928 | ||
bef4a34a | 929 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 930 | ret = storvsc_drv_init(); |
bef4a34a HJ |
931 | return ret; |
932 | } | |
933 | ||
934 | static void __exit storvsc_exit(void) | |
935 | { | |
bef4a34a | 936 | storvsc_drv_exit(); |
bef4a34a HJ |
937 | } |
938 | ||
ff568d3a | 939 | MODULE_LICENSE("GPL"); |
26c14cc1 | 940 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 941 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
942 | module_init(storvsc_init); |
943 | module_exit(storvsc_exit); |