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 | 46 | |
972621c9 | 47 | struct hv_host_device { |
97c15296 | 48 | struct hv_device *dev; |
ff568d3a GKH |
49 | struct kmem_cache *request_pool; |
50 | unsigned int port; | |
51 | unsigned char path; | |
52 | unsigned char target; | |
bef4a34a HJ |
53 | }; |
54 | ||
55 | struct storvsc_cmd_request { | |
ff568d3a GKH |
56 | struct list_head entry; |
57 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
58 | |
59 | unsigned int bounce_sgl_count; | |
ff568d3a | 60 | struct scatterlist *bounce_sgl; |
bef4a34a | 61 | |
0b3f6834 | 62 | struct hv_storvsc_request request; |
bef4a34a HJ |
63 | }; |
64 | ||
bef4a34a | 65 | |
5b60acee S |
66 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
67 | { | |
68 | /* | |
69 | * This enables luns to be located sparsely. Otherwise, we may not | |
70 | * discovered them. | |
71 | */ | |
72 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
73 | return 0; | |
74 | } | |
75 | ||
a1ebfeae S |
76 | static int storvsc_merge_bvec(struct request_queue *q, |
77 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
78 | { | |
79 | /* checking done by caller. */ | |
80 | return bvec->bv_len; | |
81 | } | |
82 | ||
419f2d03 S |
83 | static int storvsc_device_configure(struct scsi_device *sdevice) |
84 | { | |
85 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
86 | STORVSC_MAX_IO_REQUESTS); | |
87 | ||
419f2d03 S |
88 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
89 | ||
419f2d03 S |
90 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
91 | ||
92 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
93 | |
94 | return 0; | |
95 | } | |
96 | ||
49a3c7a9 S |
97 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
98 | unsigned int sg_count) | |
99 | { | |
100 | int i; | |
101 | struct page *page_buf; | |
102 | ||
103 | for (i = 0; i < sg_count; i++) { | |
104 | page_buf = sg_page((&sgl[i])); | |
105 | if (page_buf != NULL) | |
106 | __free_page(page_buf); | |
107 | } | |
108 | ||
109 | kfree(sgl); | |
110 | } | |
111 | ||
3862ef3e S |
112 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
113 | { | |
114 | int i; | |
115 | ||
116 | /* No need to check */ | |
117 | if (sg_count < 2) | |
118 | return -1; | |
119 | ||
120 | /* We have at least 2 sg entries */ | |
121 | for (i = 0; i < sg_count; i++) { | |
122 | if (i == 0) { | |
123 | /* make sure 1st one does not have hole */ | |
124 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
125 | return i; | |
126 | } else if (i == sg_count - 1) { | |
127 | /* make sure last one does not have hole */ | |
128 | if (sgl[i].offset != 0) | |
129 | return i; | |
130 | } else { | |
131 | /* make sure no hole in the middle */ | |
132 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
133 | return i; | |
134 | } | |
135 | } | |
136 | return -1; | |
137 | } | |
138 | ||
a9753cbd S |
139 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
140 | unsigned int sg_count, | |
141 | unsigned int len) | |
142 | { | |
143 | int i; | |
144 | int num_pages; | |
145 | struct scatterlist *bounce_sgl; | |
146 | struct page *page_buf; | |
147 | ||
148 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
149 | ||
150 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
151 | if (!bounce_sgl) | |
152 | return NULL; | |
153 | ||
154 | for (i = 0; i < num_pages; i++) { | |
155 | page_buf = alloc_page(GFP_ATOMIC); | |
156 | if (!page_buf) | |
157 | goto cleanup; | |
158 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
159 | } | |
160 | ||
161 | return bounce_sgl; | |
162 | ||
163 | cleanup: | |
164 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
165 | return NULL; | |
166 | } | |
167 | ||
29fe2c9b S |
168 | |
169 | /* Assume the original sgl has enough room */ | |
170 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
171 | struct scatterlist *bounce_sgl, | |
172 | unsigned int orig_sgl_count) | |
173 | { | |
174 | int i; | |
175 | int j = 0; | |
176 | unsigned long src, dest; | |
177 | unsigned int srclen, destlen, copylen; | |
178 | unsigned int total_copied = 0; | |
179 | unsigned long bounce_addr = 0; | |
180 | unsigned long dest_addr = 0; | |
181 | unsigned long flags; | |
182 | ||
183 | local_irq_save(flags); | |
184 | ||
185 | for (i = 0; i < orig_sgl_count; i++) { | |
186 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
187 | KM_IRQ0) + orig_sgl[i].offset; | |
188 | dest = dest_addr; | |
189 | destlen = orig_sgl[i].length; | |
190 | ||
191 | if (bounce_addr == 0) | |
192 | bounce_addr = | |
193 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
194 | KM_IRQ0); | |
195 | ||
196 | while (destlen) { | |
197 | src = bounce_addr + bounce_sgl[j].offset; | |
198 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
199 | ||
200 | copylen = min(srclen, destlen); | |
201 | memcpy((void *)dest, (void *)src, copylen); | |
202 | ||
203 | total_copied += copylen; | |
204 | bounce_sgl[j].offset += copylen; | |
205 | destlen -= copylen; | |
206 | dest += copylen; | |
207 | ||
208 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
209 | /* full */ | |
210 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
211 | j++; | |
212 | ||
213 | /* if we need to use another bounce buffer */ | |
214 | if (destlen || i != orig_sgl_count - 1) | |
215 | bounce_addr = | |
216 | (unsigned long)kmap_atomic( | |
217 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
218 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
219 | /* unmap the last bounce that is < PAGE_SIZE */ | |
220 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
221 | } | |
222 | } | |
223 | ||
224 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
225 | KM_IRQ0); | |
226 | } | |
227 | ||
228 | local_irq_restore(flags); | |
229 | ||
230 | return total_copied; | |
231 | } | |
232 | ||
6a8ff44b S |
233 | |
234 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
235 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
236 | struct scatterlist *bounce_sgl, | |
237 | unsigned int orig_sgl_count) | |
238 | { | |
239 | int i; | |
240 | int j = 0; | |
241 | unsigned long src, dest; | |
242 | unsigned int srclen, destlen, copylen; | |
243 | unsigned int total_copied = 0; | |
244 | unsigned long bounce_addr = 0; | |
245 | unsigned long src_addr = 0; | |
246 | unsigned long flags; | |
247 | ||
248 | local_irq_save(flags); | |
249 | ||
250 | for (i = 0; i < orig_sgl_count; i++) { | |
251 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
252 | KM_IRQ0) + orig_sgl[i].offset; | |
253 | src = src_addr; | |
254 | srclen = orig_sgl[i].length; | |
255 | ||
256 | if (bounce_addr == 0) | |
257 | bounce_addr = | |
258 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
259 | KM_IRQ0); | |
260 | ||
261 | while (srclen) { | |
262 | /* assume bounce offset always == 0 */ | |
263 | dest = bounce_addr + bounce_sgl[j].length; | |
264 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
265 | ||
266 | copylen = min(srclen, destlen); | |
267 | memcpy((void *)dest, (void *)src, copylen); | |
268 | ||
269 | total_copied += copylen; | |
270 | bounce_sgl[j].length += copylen; | |
271 | srclen -= copylen; | |
272 | src += copylen; | |
273 | ||
274 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
275 | /* full..move to next entry */ | |
276 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
277 | j++; | |
278 | ||
279 | /* if we need to use another bounce buffer */ | |
280 | if (srclen || i != orig_sgl_count - 1) | |
281 | bounce_addr = | |
282 | (unsigned long)kmap_atomic( | |
283 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
284 | ||
285 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
286 | /* unmap the last bounce that is < PAGE_SIZE */ | |
287 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
288 | } | |
289 | } | |
290 | ||
291 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
292 | } | |
293 | ||
294 | local_irq_restore(flags); | |
295 | ||
296 | return total_copied; | |
297 | } | |
298 | ||
5c5c0234 | 299 | |
5c5c0234 S |
300 | static int storvsc_remove(struct hv_device *dev) |
301 | { | |
5c5c0234 S |
302 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
303 | struct hv_host_device *host_dev = | |
304 | (struct hv_host_device *)host->hostdata; | |
305 | ||
2935a407 S |
306 | scsi_remove_host(host); |
307 | ||
2935a407 | 308 | scsi_host_put(host); |
d36b0a03 | 309 | |
6cdc57c0 | 310 | storvsc_dev_remove(dev); |
5c5c0234 S |
311 | if (host_dev->request_pool) { |
312 | kmem_cache_destroy(host_dev->request_pool); | |
313 | host_dev->request_pool = NULL; | |
314 | } | |
5c5c0234 S |
315 | return 0; |
316 | } | |
317 | ||
62838ce2 S |
318 | |
319 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
320 | sector_t capacity, int *info) | |
321 | { | |
5326fd5c S |
322 | sector_t nsect = capacity; |
323 | sector_t cylinders = nsect; | |
324 | int heads, sectors_pt; | |
62838ce2 | 325 | |
5326fd5c S |
326 | /* |
327 | * We are making up these values; let us keep it simple. | |
328 | */ | |
329 | heads = 0xff; | |
330 | sectors_pt = 0x3f; /* Sectors per track */ | |
331 | sector_div(cylinders, heads * sectors_pt); | |
332 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
333 | cylinders = 0xffff; | |
62838ce2 S |
334 | |
335 | info[0] = heads; | |
5326fd5c S |
336 | info[1] = sectors_pt; |
337 | info[2] = (int)cylinders; | |
62838ce2 | 338 | |
62838ce2 S |
339 | return 0; |
340 | } | |
aa3d789e S |
341 | |
342 | static int storvsc_host_reset(struct hv_device *device) | |
343 | { | |
344 | struct storvsc_device *stor_device; | |
345 | struct hv_storvsc_request *request; | |
346 | struct vstor_packet *vstor_packet; | |
347 | int ret, t; | |
348 | ||
aa3d789e S |
349 | |
350 | stor_device = get_stor_device(device); | |
351 | if (!stor_device) | |
352 | return -1; | |
353 | ||
354 | request = &stor_device->reset_request; | |
355 | vstor_packet = &request->vstor_packet; | |
356 | ||
357 | init_completion(&request->wait_event); | |
358 | ||
359 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
360 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
361 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
362 | ||
363 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
364 | sizeof(struct vstor_packet), | |
365 | (unsigned long)&stor_device->reset_request, | |
366 | VM_PKT_DATA_INBAND, | |
367 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
368 | if (ret != 0) | |
369 | goto cleanup; | |
370 | ||
46d2eb6d | 371 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
372 | if (t == 0) { |
373 | ret = -ETIMEDOUT; | |
374 | goto cleanup; | |
375 | } | |
376 | ||
aa3d789e S |
377 | |
378 | /* | |
379 | * At this point, all outstanding requests in the adapter | |
380 | * should have been flushed out and return to us | |
381 | */ | |
382 | ||
383 | cleanup: | |
384 | put_stor_device(device); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | ||
96e690be S |
389 | /* |
390 | * storvsc_host_reset_handler - Reset the scsi HBA | |
391 | */ | |
392 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
393 | { | |
394 | int ret; | |
395 | struct hv_host_device *host_dev = | |
396 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
397 | struct hv_device *dev = host_dev->dev; | |
398 | ||
96e690be S |
399 | ret = storvsc_host_reset(dev); |
400 | if (ret != 0) | |
401 | return ret; | |
402 | ||
96e690be S |
403 | return ret; |
404 | } | |
405 | ||
8a411bad S |
406 | |
407 | /* | |
408 | * storvsc_commmand_completion - Command completion processing | |
409 | */ | |
410 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
411 | { | |
412 | struct storvsc_cmd_request *cmd_request = | |
413 | (struct storvsc_cmd_request *)request->context; | |
414 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
415 | struct hv_host_device *host_dev = | |
416 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
417 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
418 | struct scsi_sense_hdr sense_hdr; | |
419 | struct vmscsi_request *vm_srb; | |
420 | ||
8a411bad | 421 | if (cmd_request->bounce_sgl_count) { |
8a411bad S |
422 | |
423 | /* FIXME: We can optimize on writes by just skipping this */ | |
424 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
425 | cmd_request->bounce_sgl, | |
426 | scsi_sg_count(scmnd)); | |
427 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
428 | cmd_request->bounce_sgl_count); | |
429 | } | |
430 | ||
431 | vm_srb = &request->vstor_packet.vm_srb; | |
432 | scmnd->result = vm_srb->scsi_status; | |
433 | ||
434 | if (scmnd->result) { | |
435 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
436 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
437 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
438 | } | |
439 | ||
8a411bad S |
440 | scsi_set_resid(scmnd, |
441 | request->data_buffer.len - | |
442 | vm_srb->data_transfer_length); | |
443 | ||
444 | scsi_done_fn = scmnd->scsi_done; | |
445 | ||
446 | scmnd->host_scribble = NULL; | |
447 | scmnd->scsi_done = NULL; | |
448 | ||
8a411bad S |
449 | scsi_done_fn(scmnd); |
450 | ||
451 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
452 | } | |
453 | ||
c5b463ae S |
454 | |
455 | /* | |
456 | * storvsc_queuecommand - Initiate command processing | |
457 | */ | |
458 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
459 | void (*done)(struct scsi_cmnd *)) | |
460 | { | |
461 | int ret; | |
462 | struct hv_host_device *host_dev = | |
463 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
464 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
465 | struct hv_storvsc_request *request; |
466 | struct storvsc_cmd_request *cmd_request; | |
467 | unsigned int request_size = 0; | |
468 | int i; | |
469 | struct scatterlist *sgl; | |
470 | unsigned int sg_count = 0; | |
471 | struct vmscsi_request *vm_srb; | |
472 | ||
473 | ||
474 | /* If retrying, no need to prep the cmd */ | |
475 | if (scmnd->host_scribble) { | |
c5b463ae S |
476 | |
477 | cmd_request = | |
478 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
479 | |
480 | goto retry_request; | |
481 | } | |
482 | ||
c5b463ae S |
483 | scmnd->scsi_done = done; |
484 | ||
485 | request_size = sizeof(struct storvsc_cmd_request); | |
486 | ||
487 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
488 | GFP_ATOMIC); | |
489 | if (!cmd_request) { | |
490 | scmnd->scsi_done = NULL; | |
491 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
492 | } | |
493 | ||
494 | /* Setup the cmd request */ | |
495 | cmd_request->bounce_sgl_count = 0; | |
496 | cmd_request->bounce_sgl = NULL; | |
497 | cmd_request->cmd = scmnd; | |
498 | ||
499 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
500 | ||
501 | request = &cmd_request->request; | |
502 | vm_srb = &request->vstor_packet.vm_srb; | |
503 | ||
504 | ||
505 | /* Build the SRB */ | |
506 | switch (scmnd->sc_data_direction) { | |
507 | case DMA_TO_DEVICE: | |
508 | vm_srb->data_in = WRITE_TYPE; | |
509 | break; | |
510 | case DMA_FROM_DEVICE: | |
511 | vm_srb->data_in = READ_TYPE; | |
512 | break; | |
513 | default: | |
514 | vm_srb->data_in = UNKNOWN_TYPE; | |
515 | break; | |
516 | } | |
517 | ||
518 | request->on_io_completion = storvsc_commmand_completion; | |
519 | request->context = cmd_request;/* scmnd; */ | |
520 | ||
c5b463ae S |
521 | vm_srb->port_number = host_dev->port; |
522 | vm_srb->path_id = scmnd->device->channel; | |
523 | vm_srb->target_id = scmnd->device->id; | |
524 | vm_srb->lun = scmnd->device->lun; | |
525 | ||
c5b463ae S |
526 | vm_srb->cdb_length = scmnd->cmd_len; |
527 | ||
528 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
529 | ||
530 | request->sense_buffer = scmnd->sense_buffer; | |
531 | ||
532 | ||
533 | request->data_buffer.len = scsi_bufflen(scmnd); | |
534 | if (scsi_sg_count(scmnd)) { | |
535 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
536 | sg_count = scsi_sg_count(scmnd); | |
537 | ||
538 | /* check if we need to bounce the sgl */ | |
539 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
540 | cmd_request->bounce_sgl = | |
541 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
542 | scsi_bufflen(scmnd)); | |
543 | if (!cmd_request->bounce_sgl) { | |
544 | scmnd->scsi_done = NULL; | |
545 | scmnd->host_scribble = NULL; | |
546 | kmem_cache_free(host_dev->request_pool, | |
547 | cmd_request); | |
548 | ||
549 | return SCSI_MLQUEUE_HOST_BUSY; | |
550 | } | |
551 | ||
552 | cmd_request->bounce_sgl_count = | |
553 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
554 | PAGE_SHIFT; | |
555 | ||
556 | /* | |
557 | * FIXME: We can optimize on reads by just skipping | |
558 | * this | |
559 | */ | |
560 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
561 | scsi_sg_count(scmnd)); | |
562 | ||
563 | sgl = cmd_request->bounce_sgl; | |
564 | sg_count = cmd_request->bounce_sgl_count; | |
565 | } | |
566 | ||
567 | request->data_buffer.offset = sgl[0].offset; | |
568 | ||
569 | for (i = 0; i < sg_count; i++) | |
570 | request->data_buffer.pfn_array[i] = | |
571 | page_to_pfn(sg_page((&sgl[i]))); | |
572 | ||
573 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
574 | request->data_buffer.offset = |
575 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
576 | request->data_buffer.pfn_array[0] = | |
577 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
578 | } | |
579 | ||
580 | retry_request: | |
581 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
582 | ret = storvsc_do_io(dev, &cmd_request->request); |
583 | ||
c5b463ae S |
584 | if (ret == -1) { |
585 | /* no more space */ | |
586 | ||
587 | if (cmd_request->bounce_sgl_count) { | |
588 | /* | |
589 | * FIXME: We can optimize on writes by just skipping | |
590 | * this | |
591 | */ | |
592 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
593 | cmd_request->bounce_sgl, | |
594 | scsi_sg_count(scmnd)); | |
595 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
596 | cmd_request->bounce_sgl_count); | |
597 | } | |
598 | ||
599 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
600 | ||
601 | scmnd->scsi_done = NULL; | |
602 | scmnd->host_scribble = NULL; | |
603 | ||
604 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
605 | } | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
610 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
611 | ||
bef4a34a | 612 | |
454f18a9 | 613 | /* Scsi driver */ |
bef4a34a | 614 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
615 | .module = THIS_MODULE, |
616 | .name = "storvsc_host_t", | |
617 | .bios_param = storvsc_get_chs, | |
618 | .queuecommand = storvsc_queuecommand, | |
619 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
620 | .slave_alloc = storvsc_device_alloc, | |
621 | .slave_configure = storvsc_device_configure, | |
622 | .cmd_per_lun = 1, | |
623 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 624 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 625 | .this_id = -1, |
454f18a9 | 626 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
627 | /* currently 32 */ |
628 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
629 | /* | |
630 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
631 | * into 1 sg element. If set, we must limit the max_segment_size to | |
632 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
633 | * multiple | |
634 | */ | |
454f18a9 | 635 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 636 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 637 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 638 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
639 | }; |
640 | ||
d847b5fe S |
641 | static const struct hv_vmbus_device_id id_table[] = { |
642 | { | |
643 | /* SCSI guid */ | |
644 | .guid = { | |
645 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
646 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
647 | } | |
648 | }, | |
649 | { | |
650 | .guid = { } | |
651 | }, | |
652 | }; | |
bef4a34a | 653 | |
d847b5fe | 654 | MODULE_DEVICE_TABLE(vmbus, id_table); |
3e189519 | 655 | /* |
ff568d3a GKH |
656 | * storvsc_probe - Add a new device for this driver |
657 | */ | |
f5c78872 | 658 | |
9efd21e1 | 659 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 660 | { |
ff568d3a | 661 | int ret; |
bef4a34a | 662 | struct Scsi_Host *host; |
795b613d | 663 | struct hv_host_device *host_dev; |
9f0c7d2c | 664 | struct storvsc_device_info device_info; |
bef4a34a | 665 | |
ff568d3a | 666 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 667 | sizeof(struct hv_host_device)); |
f8feed06 | 668 | if (!host) |
bef4a34a | 669 | return -ENOMEM; |
bef4a34a | 670 | |
9efd21e1 | 671 | dev_set_drvdata(&device->device, host); |
bef4a34a | 672 | |
795b613d S |
673 | host_dev = (struct hv_host_device *)host->hostdata; |
674 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 675 | |
795b613d | 676 | host_dev->port = host->host_no; |
97c15296 | 677 | host_dev->dev = device; |
bef4a34a | 678 | |
795b613d | 679 | host_dev->request_pool = |
9efd21e1 | 680 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 681 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
682 | SLAB_HWCACHE_ALIGN, NULL); |
683 | ||
795b613d | 684 | if (!host_dev->request_pool) { |
bef4a34a | 685 | scsi_host_put(host); |
bef4a34a HJ |
686 | return -ENOMEM; |
687 | } | |
688 | ||
8a046024 | 689 | device_info.port_number = host->host_no; |
fa4d123a | 690 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 691 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 692 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 693 | |
ff568d3a | 694 | if (ret != 0) { |
795b613d | 695 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 696 | scsi_host_put(host); |
bef4a34a HJ |
697 | return -1; |
698 | } | |
699 | ||
795b613d S |
700 | host_dev->path = device_info.path_id; |
701 | host_dev->target = device_info.target_id; | |
bef4a34a | 702 | |
ff568d3a GKH |
703 | /* max # of devices per target */ |
704 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
705 | /* max # of targets per channel */ | |
706 | host->max_id = STORVSC_MAX_TARGETS; | |
707 | /* max # of channels */ | |
708 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 709 | |
454f18a9 | 710 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 711 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 712 | if (ret != 0) { |
bef4a34a | 713 | |
6cdc57c0 | 714 | storvsc_dev_remove(device); |
bef4a34a | 715 | |
795b613d | 716 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 717 | scsi_host_put(host); |
bef4a34a HJ |
718 | return -1; |
719 | } | |
720 | ||
721 | scsi_scan_host(host); | |
bef4a34a HJ |
722 | return ret; |
723 | } | |
724 | ||
7bd05b91 S |
725 | /* The one and only one */ |
726 | ||
40bf63ed | 727 | static struct hv_driver storvsc_drv = { |
d847b5fe | 728 | .id_table = id_table, |
40bf63ed S |
729 | .probe = storvsc_probe, |
730 | .remove = storvsc_remove, | |
39ae6fae | 731 | }; |
7bd05b91 | 732 | |
3e1edf6a S |
733 | /* |
734 | * We use a DMI table to determine if we should autoload this driver This is | |
735 | * needed by distro tools to determine if the hyperv drivers should be | |
736 | * installed and/or configured. We don't do anything else with the table, but | |
737 | * it needs to be present. | |
738 | */ | |
739 | ||
740 | static const struct dmi_system_id __initconst | |
741 | hv_stor_dmi_table[] __maybe_unused = { | |
742 | { | |
743 | .ident = "Hyper-V", | |
744 | .matches = { | |
745 | DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), | |
746 | DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"), | |
747 | DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"), | |
748 | }, | |
749 | }, | |
750 | { }, | |
751 | }; | |
752 | MODULE_DEVICE_TABLE(dmi, hv_stor_dmi_table); | |
753 | ||
d9bbae83 | 754 | static int __init storvsc_drv_init(void) |
f5c78872 S |
755 | { |
756 | int ret; | |
40bf63ed | 757 | struct hv_driver *drv = &storvsc_drv; |
01415ab3 S |
758 | u32 max_outstanding_req_per_channel; |
759 | ||
760 | /* | |
761 | * Divide the ring buffer data size (which is 1 page less | |
762 | * than the ring buffer size since that page is reserved for | |
763 | * the ring buffer indices) by the max request size (which is | |
764 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
765 | */ | |
766 | ||
767 | max_outstanding_req_per_channel = | |
768 | ((storvsc_ringbuffer_size - PAGE_SIZE) / | |
769 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
770 | sizeof(struct vstor_packet) + sizeof(u64), | |
771 | sizeof(u64))); | |
f5c78872 | 772 | |
01415ab3 | 773 | if (max_outstanding_req_per_channel < |
f5c78872 S |
774 | STORVSC_MAX_IO_REQUESTS) |
775 | return -1; | |
776 | ||
206cf17b | 777 | drv->driver.name = driver_name; |
f5c78872 | 778 | |
f5c78872 S |
779 | |
780 | /* The driver belongs to vmbus */ | |
781 | ret = vmbus_child_driver_register(&drv->driver); | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
c63ba9e1 | 786 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 787 | { |
2bda87cb | 788 | vmbus_child_driver_unregister(&storvsc_drv.driver); |
f5c78872 S |
789 | } |
790 | ||
ff568d3a | 791 | MODULE_LICENSE("GPL"); |
26c14cc1 | 792 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 793 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 794 | module_init(storvsc_drv_init); |
c63ba9e1 | 795 | module_exit(storvsc_drv_exit); |