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> | |
3e1edf6a | 27 | #include <linux/dmi.h> |
bef4a34a HJ |
28 | #include <scsi/scsi.h> |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_host.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi_eh.h> | |
34 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 35 | #include <scsi/scsi_dbg.h> |
3f335ea2 S |
36 | |
37 | #include "hyperv.h" | |
cdee1504 | 38 | #include "hyperv_storage.h" |
bef4a34a | 39 | |
2db2cabe | 40 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
bef4a34a | 41 | |
3d598ce1 S |
42 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
43 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
44 | ||
0f0cdc6a | 45 | static const char *driver_name = "storvsc"; |
6dec2442 S |
46 | |
47 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ | |
358d2ee2 S |
48 | static const uuid_le stor_vsci_device_type = { |
49 | .b = { | |
6dec2442 S |
50 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, |
51 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
52 | } | |
53 | }; | |
54 | ||
972621c9 | 55 | struct hv_host_device { |
97c15296 | 56 | struct hv_device *dev; |
ff568d3a GKH |
57 | struct kmem_cache *request_pool; |
58 | unsigned int port; | |
59 | unsigned char path; | |
60 | unsigned char target; | |
bef4a34a HJ |
61 | }; |
62 | ||
63 | struct storvsc_cmd_request { | |
ff568d3a GKH |
64 | struct list_head entry; |
65 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
66 | |
67 | unsigned int bounce_sgl_count; | |
ff568d3a | 68 | struct scatterlist *bounce_sgl; |
bef4a34a | 69 | |
0b3f6834 | 70 | struct hv_storvsc_request request; |
bef4a34a HJ |
71 | }; |
72 | ||
bef4a34a | 73 | |
5b60acee S |
74 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
75 | { | |
76 | /* | |
77 | * This enables luns to be located sparsely. Otherwise, we may not | |
78 | * discovered them. | |
79 | */ | |
80 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
81 | return 0; | |
82 | } | |
83 | ||
a1ebfeae S |
84 | static int storvsc_merge_bvec(struct request_queue *q, |
85 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
86 | { | |
87 | /* checking done by caller. */ | |
88 | return bvec->bv_len; | |
89 | } | |
90 | ||
419f2d03 S |
91 | static int storvsc_device_configure(struct scsi_device *sdevice) |
92 | { | |
93 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
94 | STORVSC_MAX_IO_REQUESTS); | |
95 | ||
419f2d03 S |
96 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
97 | ||
419f2d03 S |
98 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
99 | ||
100 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
49a3c7a9 S |
105 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
106 | unsigned int sg_count) | |
107 | { | |
108 | int i; | |
109 | struct page *page_buf; | |
110 | ||
111 | for (i = 0; i < sg_count; i++) { | |
112 | page_buf = sg_page((&sgl[i])); | |
113 | if (page_buf != NULL) | |
114 | __free_page(page_buf); | |
115 | } | |
116 | ||
117 | kfree(sgl); | |
118 | } | |
119 | ||
3862ef3e S |
120 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
121 | { | |
122 | int i; | |
123 | ||
124 | /* No need to check */ | |
125 | if (sg_count < 2) | |
126 | return -1; | |
127 | ||
128 | /* We have at least 2 sg entries */ | |
129 | for (i = 0; i < sg_count; i++) { | |
130 | if (i == 0) { | |
131 | /* make sure 1st one does not have hole */ | |
132 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
133 | return i; | |
134 | } else if (i == sg_count - 1) { | |
135 | /* make sure last one does not have hole */ | |
136 | if (sgl[i].offset != 0) | |
137 | return i; | |
138 | } else { | |
139 | /* make sure no hole in the middle */ | |
140 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
141 | return i; | |
142 | } | |
143 | } | |
144 | return -1; | |
145 | } | |
146 | ||
a9753cbd S |
147 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
148 | unsigned int sg_count, | |
149 | unsigned int len) | |
150 | { | |
151 | int i; | |
152 | int num_pages; | |
153 | struct scatterlist *bounce_sgl; | |
154 | struct page *page_buf; | |
155 | ||
156 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
157 | ||
158 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
159 | if (!bounce_sgl) | |
160 | return NULL; | |
161 | ||
162 | for (i = 0; i < num_pages; i++) { | |
163 | page_buf = alloc_page(GFP_ATOMIC); | |
164 | if (!page_buf) | |
165 | goto cleanup; | |
166 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
167 | } | |
168 | ||
169 | return bounce_sgl; | |
170 | ||
171 | cleanup: | |
172 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
173 | return NULL; | |
174 | } | |
175 | ||
29fe2c9b S |
176 | |
177 | /* Assume the original sgl has enough room */ | |
178 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
179 | struct scatterlist *bounce_sgl, | |
180 | unsigned int orig_sgl_count) | |
181 | { | |
182 | int i; | |
183 | int j = 0; | |
184 | unsigned long src, dest; | |
185 | unsigned int srclen, destlen, copylen; | |
186 | unsigned int total_copied = 0; | |
187 | unsigned long bounce_addr = 0; | |
188 | unsigned long dest_addr = 0; | |
189 | unsigned long flags; | |
190 | ||
191 | local_irq_save(flags); | |
192 | ||
193 | for (i = 0; i < orig_sgl_count; i++) { | |
194 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
195 | KM_IRQ0) + orig_sgl[i].offset; | |
196 | dest = dest_addr; | |
197 | destlen = orig_sgl[i].length; | |
198 | ||
199 | if (bounce_addr == 0) | |
200 | bounce_addr = | |
201 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
202 | KM_IRQ0); | |
203 | ||
204 | while (destlen) { | |
205 | src = bounce_addr + bounce_sgl[j].offset; | |
206 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
207 | ||
208 | copylen = min(srclen, destlen); | |
209 | memcpy((void *)dest, (void *)src, copylen); | |
210 | ||
211 | total_copied += copylen; | |
212 | bounce_sgl[j].offset += copylen; | |
213 | destlen -= copylen; | |
214 | dest += copylen; | |
215 | ||
216 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
217 | /* full */ | |
218 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
219 | j++; | |
220 | ||
221 | /* if we need to use another bounce buffer */ | |
222 | if (destlen || i != orig_sgl_count - 1) | |
223 | bounce_addr = | |
224 | (unsigned long)kmap_atomic( | |
225 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
226 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
227 | /* unmap the last bounce that is < PAGE_SIZE */ | |
228 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
229 | } | |
230 | } | |
231 | ||
232 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
233 | KM_IRQ0); | |
234 | } | |
235 | ||
236 | local_irq_restore(flags); | |
237 | ||
238 | return total_copied; | |
239 | } | |
240 | ||
6a8ff44b S |
241 | |
242 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
243 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
244 | struct scatterlist *bounce_sgl, | |
245 | unsigned int orig_sgl_count) | |
246 | { | |
247 | int i; | |
248 | int j = 0; | |
249 | unsigned long src, dest; | |
250 | unsigned int srclen, destlen, copylen; | |
251 | unsigned int total_copied = 0; | |
252 | unsigned long bounce_addr = 0; | |
253 | unsigned long src_addr = 0; | |
254 | unsigned long flags; | |
255 | ||
256 | local_irq_save(flags); | |
257 | ||
258 | for (i = 0; i < orig_sgl_count; i++) { | |
259 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
260 | KM_IRQ0) + orig_sgl[i].offset; | |
261 | src = src_addr; | |
262 | srclen = orig_sgl[i].length; | |
263 | ||
264 | if (bounce_addr == 0) | |
265 | bounce_addr = | |
266 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
267 | KM_IRQ0); | |
268 | ||
269 | while (srclen) { | |
270 | /* assume bounce offset always == 0 */ | |
271 | dest = bounce_addr + bounce_sgl[j].length; | |
272 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
273 | ||
274 | copylen = min(srclen, destlen); | |
275 | memcpy((void *)dest, (void *)src, copylen); | |
276 | ||
277 | total_copied += copylen; | |
278 | bounce_sgl[j].length += copylen; | |
279 | srclen -= copylen; | |
280 | src += copylen; | |
281 | ||
282 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
283 | /* full..move to next entry */ | |
284 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
285 | j++; | |
286 | ||
287 | /* if we need to use another bounce buffer */ | |
288 | if (srclen || i != orig_sgl_count - 1) | |
289 | bounce_addr = | |
290 | (unsigned long)kmap_atomic( | |
291 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
292 | ||
293 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
294 | /* unmap the last bounce that is < PAGE_SIZE */ | |
295 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
296 | } | |
297 | } | |
298 | ||
299 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
300 | } | |
301 | ||
302 | local_irq_restore(flags); | |
303 | ||
304 | return total_copied; | |
305 | } | |
306 | ||
5c5c0234 | 307 | |
5c5c0234 S |
308 | static int storvsc_remove(struct hv_device *dev) |
309 | { | |
5c5c0234 S |
310 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
311 | struct hv_host_device *host_dev = | |
312 | (struct hv_host_device *)host->hostdata; | |
313 | ||
2935a407 S |
314 | scsi_remove_host(host); |
315 | ||
2935a407 | 316 | scsi_host_put(host); |
d36b0a03 | 317 | |
6cdc57c0 | 318 | storvsc_dev_remove(dev); |
5c5c0234 S |
319 | if (host_dev->request_pool) { |
320 | kmem_cache_destroy(host_dev->request_pool); | |
321 | host_dev->request_pool = NULL; | |
322 | } | |
5c5c0234 S |
323 | return 0; |
324 | } | |
325 | ||
62838ce2 S |
326 | |
327 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
328 | sector_t capacity, int *info) | |
329 | { | |
5326fd5c S |
330 | sector_t nsect = capacity; |
331 | sector_t cylinders = nsect; | |
332 | int heads, sectors_pt; | |
62838ce2 | 333 | |
5326fd5c S |
334 | /* |
335 | * We are making up these values; let us keep it simple. | |
336 | */ | |
337 | heads = 0xff; | |
338 | sectors_pt = 0x3f; /* Sectors per track */ | |
339 | sector_div(cylinders, heads * sectors_pt); | |
340 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
341 | cylinders = 0xffff; | |
62838ce2 S |
342 | |
343 | info[0] = heads; | |
5326fd5c S |
344 | info[1] = sectors_pt; |
345 | info[2] = (int)cylinders; | |
62838ce2 | 346 | |
62838ce2 S |
347 | return 0; |
348 | } | |
aa3d789e S |
349 | |
350 | static int storvsc_host_reset(struct hv_device *device) | |
351 | { | |
352 | struct storvsc_device *stor_device; | |
353 | struct hv_storvsc_request *request; | |
354 | struct vstor_packet *vstor_packet; | |
355 | int ret, t; | |
356 | ||
aa3d789e S |
357 | |
358 | stor_device = get_stor_device(device); | |
359 | if (!stor_device) | |
360 | return -1; | |
361 | ||
362 | request = &stor_device->reset_request; | |
363 | vstor_packet = &request->vstor_packet; | |
364 | ||
365 | init_completion(&request->wait_event); | |
366 | ||
367 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
368 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
369 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
370 | ||
371 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
372 | sizeof(struct vstor_packet), | |
373 | (unsigned long)&stor_device->reset_request, | |
374 | VM_PKT_DATA_INBAND, | |
375 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
376 | if (ret != 0) | |
377 | goto cleanup; | |
378 | ||
46d2eb6d | 379 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
380 | if (t == 0) { |
381 | ret = -ETIMEDOUT; | |
382 | goto cleanup; | |
383 | } | |
384 | ||
aa3d789e S |
385 | |
386 | /* | |
387 | * At this point, all outstanding requests in the adapter | |
388 | * should have been flushed out and return to us | |
389 | */ | |
390 | ||
391 | cleanup: | |
392 | put_stor_device(device); | |
393 | return ret; | |
394 | } | |
395 | ||
396 | ||
96e690be S |
397 | /* |
398 | * storvsc_host_reset_handler - Reset the scsi HBA | |
399 | */ | |
400 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
401 | { | |
402 | int ret; | |
403 | struct hv_host_device *host_dev = | |
404 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
405 | struct hv_device *dev = host_dev->dev; | |
406 | ||
96e690be S |
407 | ret = storvsc_host_reset(dev); |
408 | if (ret != 0) | |
409 | return ret; | |
410 | ||
96e690be S |
411 | return ret; |
412 | } | |
413 | ||
8a411bad S |
414 | |
415 | /* | |
416 | * storvsc_commmand_completion - Command completion processing | |
417 | */ | |
418 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
419 | { | |
420 | struct storvsc_cmd_request *cmd_request = | |
421 | (struct storvsc_cmd_request *)request->context; | |
422 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
423 | struct hv_host_device *host_dev = | |
424 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
425 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
426 | struct scsi_sense_hdr sense_hdr; | |
427 | struct vmscsi_request *vm_srb; | |
428 | ||
8a411bad | 429 | if (cmd_request->bounce_sgl_count) { |
8a411bad S |
430 | |
431 | /* FIXME: We can optimize on writes by just skipping this */ | |
432 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
433 | cmd_request->bounce_sgl, | |
434 | scsi_sg_count(scmnd)); | |
435 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
436 | cmd_request->bounce_sgl_count); | |
437 | } | |
438 | ||
439 | vm_srb = &request->vstor_packet.vm_srb; | |
440 | scmnd->result = vm_srb->scsi_status; | |
441 | ||
442 | if (scmnd->result) { | |
443 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
444 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
445 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
446 | } | |
447 | ||
8a411bad S |
448 | scsi_set_resid(scmnd, |
449 | request->data_buffer.len - | |
450 | vm_srb->data_transfer_length); | |
451 | ||
452 | scsi_done_fn = scmnd->scsi_done; | |
453 | ||
454 | scmnd->host_scribble = NULL; | |
455 | scmnd->scsi_done = NULL; | |
456 | ||
8a411bad S |
457 | scsi_done_fn(scmnd); |
458 | ||
459 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
460 | } | |
461 | ||
c5b463ae S |
462 | |
463 | /* | |
464 | * storvsc_queuecommand - Initiate command processing | |
465 | */ | |
466 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
467 | void (*done)(struct scsi_cmnd *)) | |
468 | { | |
469 | int ret; | |
470 | struct hv_host_device *host_dev = | |
471 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
472 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
473 | struct hv_storvsc_request *request; |
474 | struct storvsc_cmd_request *cmd_request; | |
475 | unsigned int request_size = 0; | |
476 | int i; | |
477 | struct scatterlist *sgl; | |
478 | unsigned int sg_count = 0; | |
479 | struct vmscsi_request *vm_srb; | |
480 | ||
481 | ||
482 | /* If retrying, no need to prep the cmd */ | |
483 | if (scmnd->host_scribble) { | |
c5b463ae S |
484 | |
485 | cmd_request = | |
486 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
487 | |
488 | goto retry_request; | |
489 | } | |
490 | ||
c5b463ae S |
491 | scmnd->scsi_done = done; |
492 | ||
493 | request_size = sizeof(struct storvsc_cmd_request); | |
494 | ||
495 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
496 | GFP_ATOMIC); | |
497 | if (!cmd_request) { | |
498 | scmnd->scsi_done = NULL; | |
499 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
500 | } | |
501 | ||
502 | /* Setup the cmd request */ | |
503 | cmd_request->bounce_sgl_count = 0; | |
504 | cmd_request->bounce_sgl = NULL; | |
505 | cmd_request->cmd = scmnd; | |
506 | ||
507 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
508 | ||
509 | request = &cmd_request->request; | |
510 | vm_srb = &request->vstor_packet.vm_srb; | |
511 | ||
512 | ||
513 | /* Build the SRB */ | |
514 | switch (scmnd->sc_data_direction) { | |
515 | case DMA_TO_DEVICE: | |
516 | vm_srb->data_in = WRITE_TYPE; | |
517 | break; | |
518 | case DMA_FROM_DEVICE: | |
519 | vm_srb->data_in = READ_TYPE; | |
520 | break; | |
521 | default: | |
522 | vm_srb->data_in = UNKNOWN_TYPE; | |
523 | break; | |
524 | } | |
525 | ||
526 | request->on_io_completion = storvsc_commmand_completion; | |
527 | request->context = cmd_request;/* scmnd; */ | |
528 | ||
c5b463ae S |
529 | vm_srb->port_number = host_dev->port; |
530 | vm_srb->path_id = scmnd->device->channel; | |
531 | vm_srb->target_id = scmnd->device->id; | |
532 | vm_srb->lun = scmnd->device->lun; | |
533 | ||
c5b463ae S |
534 | vm_srb->cdb_length = scmnd->cmd_len; |
535 | ||
536 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
537 | ||
538 | request->sense_buffer = scmnd->sense_buffer; | |
539 | ||
540 | ||
541 | request->data_buffer.len = scsi_bufflen(scmnd); | |
542 | if (scsi_sg_count(scmnd)) { | |
543 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
544 | sg_count = scsi_sg_count(scmnd); | |
545 | ||
546 | /* check if we need to bounce the sgl */ | |
547 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
548 | cmd_request->bounce_sgl = | |
549 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
550 | scsi_bufflen(scmnd)); | |
551 | if (!cmd_request->bounce_sgl) { | |
552 | scmnd->scsi_done = NULL; | |
553 | scmnd->host_scribble = NULL; | |
554 | kmem_cache_free(host_dev->request_pool, | |
555 | cmd_request); | |
556 | ||
557 | return SCSI_MLQUEUE_HOST_BUSY; | |
558 | } | |
559 | ||
560 | cmd_request->bounce_sgl_count = | |
561 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
562 | PAGE_SHIFT; | |
563 | ||
564 | /* | |
565 | * FIXME: We can optimize on reads by just skipping | |
566 | * this | |
567 | */ | |
568 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
569 | scsi_sg_count(scmnd)); | |
570 | ||
571 | sgl = cmd_request->bounce_sgl; | |
572 | sg_count = cmd_request->bounce_sgl_count; | |
573 | } | |
574 | ||
575 | request->data_buffer.offset = sgl[0].offset; | |
576 | ||
577 | for (i = 0; i < sg_count; i++) | |
578 | request->data_buffer.pfn_array[i] = | |
579 | page_to_pfn(sg_page((&sgl[i]))); | |
580 | ||
581 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
582 | request->data_buffer.offset = |
583 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
584 | request->data_buffer.pfn_array[0] = | |
585 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
586 | } | |
587 | ||
588 | retry_request: | |
589 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
590 | ret = storvsc_do_io(dev, &cmd_request->request); |
591 | ||
c5b463ae S |
592 | if (ret == -1) { |
593 | /* no more space */ | |
594 | ||
595 | if (cmd_request->bounce_sgl_count) { | |
596 | /* | |
597 | * FIXME: We can optimize on writes by just skipping | |
598 | * this | |
599 | */ | |
600 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
601 | cmd_request->bounce_sgl, | |
602 | scsi_sg_count(scmnd)); | |
603 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
604 | cmd_request->bounce_sgl_count); | |
605 | } | |
606 | ||
607 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
608 | ||
609 | scmnd->scsi_done = NULL; | |
610 | scmnd->host_scribble = NULL; | |
611 | ||
612 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
613 | } | |
614 | ||
615 | return ret; | |
616 | } | |
617 | ||
618 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
619 | ||
bef4a34a | 620 | |
454f18a9 | 621 | /* Scsi driver */ |
bef4a34a | 622 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
623 | .module = THIS_MODULE, |
624 | .name = "storvsc_host_t", | |
625 | .bios_param = storvsc_get_chs, | |
626 | .queuecommand = storvsc_queuecommand, | |
627 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
628 | .slave_alloc = storvsc_device_alloc, | |
629 | .slave_configure = storvsc_device_configure, | |
630 | .cmd_per_lun = 1, | |
631 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 632 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 633 | .this_id = -1, |
454f18a9 | 634 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
635 | /* currently 32 */ |
636 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
637 | /* | |
638 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
639 | * into 1 sg element. If set, we must limit the max_segment_size to | |
640 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
641 | * multiple | |
642 | */ | |
454f18a9 | 643 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 644 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 645 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 646 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
647 | }; |
648 | ||
649 | ||
3e189519 | 650 | /* |
ff568d3a GKH |
651 | * storvsc_probe - Add a new device for this driver |
652 | */ | |
f5c78872 | 653 | |
9efd21e1 | 654 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 655 | { |
ff568d3a | 656 | int ret; |
bef4a34a | 657 | struct Scsi_Host *host; |
795b613d | 658 | struct hv_host_device *host_dev; |
9f0c7d2c | 659 | struct storvsc_device_info device_info; |
bef4a34a | 660 | |
ff568d3a | 661 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 662 | sizeof(struct hv_host_device)); |
f8feed06 | 663 | if (!host) |
bef4a34a | 664 | return -ENOMEM; |
bef4a34a | 665 | |
9efd21e1 | 666 | dev_set_drvdata(&device->device, host); |
bef4a34a | 667 | |
795b613d S |
668 | host_dev = (struct hv_host_device *)host->hostdata; |
669 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 670 | |
795b613d | 671 | host_dev->port = host->host_no; |
97c15296 | 672 | host_dev->dev = device; |
bef4a34a | 673 | |
795b613d | 674 | host_dev->request_pool = |
9efd21e1 | 675 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 676 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
677 | SLAB_HWCACHE_ALIGN, NULL); |
678 | ||
795b613d | 679 | if (!host_dev->request_pool) { |
bef4a34a | 680 | scsi_host_put(host); |
bef4a34a HJ |
681 | return -ENOMEM; |
682 | } | |
683 | ||
8a046024 | 684 | device_info.port_number = host->host_no; |
fa4d123a | 685 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 686 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 687 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 688 | |
ff568d3a | 689 | if (ret != 0) { |
795b613d | 690 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 691 | scsi_host_put(host); |
bef4a34a HJ |
692 | return -1; |
693 | } | |
694 | ||
795b613d S |
695 | host_dev->path = device_info.path_id; |
696 | host_dev->target = device_info.target_id; | |
bef4a34a | 697 | |
ff568d3a GKH |
698 | /* max # of devices per target */ |
699 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
700 | /* max # of targets per channel */ | |
701 | host->max_id = STORVSC_MAX_TARGETS; | |
702 | /* max # of channels */ | |
703 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 704 | |
454f18a9 | 705 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 706 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 707 | if (ret != 0) { |
bef4a34a | 708 | |
6cdc57c0 | 709 | storvsc_dev_remove(device); |
bef4a34a | 710 | |
795b613d | 711 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 712 | scsi_host_put(host); |
bef4a34a HJ |
713 | return -1; |
714 | } | |
715 | ||
716 | scsi_scan_host(host); | |
bef4a34a HJ |
717 | return ret; |
718 | } | |
719 | ||
7bd05b91 S |
720 | /* The one and only one */ |
721 | ||
40bf63ed S |
722 | static struct hv_driver storvsc_drv = { |
723 | .probe = storvsc_probe, | |
724 | .remove = storvsc_remove, | |
39ae6fae | 725 | }; |
7bd05b91 | 726 | |
3e1edf6a S |
727 | /* |
728 | * We use a DMI table to determine if we should autoload this driver This is | |
729 | * needed by distro tools to determine if the hyperv drivers should be | |
730 | * installed and/or configured. We don't do anything else with the table, but | |
731 | * it needs to be present. | |
732 | */ | |
733 | ||
734 | static const struct dmi_system_id __initconst | |
735 | hv_stor_dmi_table[] __maybe_unused = { | |
736 | { | |
737 | .ident = "Hyper-V", | |
738 | .matches = { | |
739 | DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), | |
740 | DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"), | |
741 | DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"), | |
742 | }, | |
743 | }, | |
744 | { }, | |
745 | }; | |
746 | MODULE_DEVICE_TABLE(dmi, hv_stor_dmi_table); | |
747 | ||
d9bbae83 | 748 | static int __init storvsc_drv_init(void) |
f5c78872 S |
749 | { |
750 | int ret; | |
40bf63ed | 751 | struct hv_driver *drv = &storvsc_drv; |
01415ab3 S |
752 | u32 max_outstanding_req_per_channel; |
753 | ||
754 | /* | |
755 | * Divide the ring buffer data size (which is 1 page less | |
756 | * than the ring buffer size since that page is reserved for | |
757 | * the ring buffer indices) by the max request size (which is | |
758 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
759 | */ | |
760 | ||
761 | max_outstanding_req_per_channel = | |
762 | ((storvsc_ringbuffer_size - PAGE_SIZE) / | |
763 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
764 | sizeof(struct vstor_packet) + sizeof(u64), | |
765 | sizeof(u64))); | |
f5c78872 | 766 | |
990f05e6 | 767 | memcpy(&drv->dev_type, &stor_vsci_device_type, |
358d2ee2 | 768 | sizeof(uuid_le)); |
1a96d9a4 | 769 | |
01415ab3 | 770 | if (max_outstanding_req_per_channel < |
f5c78872 S |
771 | STORVSC_MAX_IO_REQUESTS) |
772 | return -1; | |
773 | ||
206cf17b | 774 | drv->driver.name = driver_name; |
f5c78872 | 775 | |
f5c78872 S |
776 | |
777 | /* The driver belongs to vmbus */ | |
778 | ret = vmbus_child_driver_register(&drv->driver); | |
779 | ||
780 | return ret; | |
781 | } | |
782 | ||
c63ba9e1 | 783 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 784 | { |
2bda87cb | 785 | vmbus_child_driver_unregister(&storvsc_drv.driver); |
f5c78872 S |
786 | } |
787 | ||
ff568d3a | 788 | MODULE_LICENSE("GPL"); |
26c14cc1 | 789 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 790 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 791 | module_init(storvsc_drv_init); |
c63ba9e1 | 792 | module_exit(storvsc_drv_exit); |