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 | |
bef4a34a | 43 | |
0f0cdc6a | 44 | static const char *driver_name = "storvsc"; |
6dec2442 S |
45 | |
46 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ | |
47 | static const struct hv_guid gStorVscDeviceType = { | |
48 | .data = { | |
49 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
50 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
51 | } | |
52 | }; | |
53 | ||
972621c9 | 54 | struct hv_host_device { |
97c15296 | 55 | struct hv_device *dev; |
ff568d3a GKH |
56 | struct kmem_cache *request_pool; |
57 | unsigned int port; | |
58 | unsigned char path; | |
59 | unsigned char target; | |
bef4a34a HJ |
60 | }; |
61 | ||
62 | struct storvsc_cmd_request { | |
ff568d3a GKH |
63 | struct list_head entry; |
64 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
65 | |
66 | unsigned int bounce_sgl_count; | |
ff568d3a | 67 | struct scatterlist *bounce_sgl; |
bef4a34a | 68 | |
0b3f6834 | 69 | struct hv_storvsc_request request; |
bef4a34a HJ |
70 | }; |
71 | ||
bef4a34a | 72 | |
6dec2442 | 73 | /* |
cf6fdfb3 | 74 | * storvsc_initialize - Main entry point |
6dec2442 | 75 | */ |
cf6fdfb3 | 76 | static int storvsc_initialize(struct hv_driver *driver) |
6dec2442 | 77 | { |
2e79505d | 78 | struct storvsc_driver *stor_driver; |
6dec2442 | 79 | |
ced01b0d | 80 | stor_driver = hvdr_to_stordr(driver); |
6dec2442 | 81 | |
6dec2442 S |
82 | |
83 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
84 | ||
0f0cdc6a | 85 | driver->name = driver_name; |
6dec2442 S |
86 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
87 | sizeof(struct hv_guid)); | |
88 | ||
6dec2442 S |
89 | |
90 | /* | |
91 | * Divide the ring buffer data size (which is 1 page less | |
92 | * than the ring buffer size since that page is reserved for | |
93 | * the ring buffer indices) by the max request size (which is | |
94 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
95 | */ | |
96 | stor_driver->max_outstanding_req_per_channel = | |
97 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
98 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
99 | sizeof(struct vstor_packet) + sizeof(u64), | |
100 | sizeof(u64))); | |
101 | ||
102 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
103 | stor_driver->max_outstanding_req_per_channel, | |
104 | STORVSC_MAX_IO_REQUESTS); | |
105 | ||
106 | /* Setup the dispatch table */ | |
2ac5dad1 | 107 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 108 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 109 | |
bb465926 | 110 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
111 | |
112 | return 0; | |
113 | } | |
114 | ||
5b60acee S |
115 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
116 | { | |
117 | /* | |
118 | * This enables luns to be located sparsely. Otherwise, we may not | |
119 | * discovered them. | |
120 | */ | |
121 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
122 | return 0; | |
123 | } | |
124 | ||
a1ebfeae S |
125 | static int storvsc_merge_bvec(struct request_queue *q, |
126 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
127 | { | |
128 | /* checking done by caller. */ | |
129 | return bvec->bv_len; | |
130 | } | |
131 | ||
419f2d03 S |
132 | static int storvsc_device_configure(struct scsi_device *sdevice) |
133 | { | |
134 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
135 | STORVSC_MAX_IO_REQUESTS); | |
136 | ||
137 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", | |
138 | sdevice, PAGE_SIZE); | |
139 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); | |
140 | ||
141 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", | |
142 | sdevice); | |
143 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
144 | ||
145 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
146 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
49a3c7a9 S |
151 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
152 | unsigned int sg_count) | |
153 | { | |
154 | int i; | |
155 | struct page *page_buf; | |
156 | ||
157 | for (i = 0; i < sg_count; i++) { | |
158 | page_buf = sg_page((&sgl[i])); | |
159 | if (page_buf != NULL) | |
160 | __free_page(page_buf); | |
161 | } | |
162 | ||
163 | kfree(sgl); | |
164 | } | |
165 | ||
3862ef3e S |
166 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
167 | { | |
168 | int i; | |
169 | ||
170 | /* No need to check */ | |
171 | if (sg_count < 2) | |
172 | return -1; | |
173 | ||
174 | /* We have at least 2 sg entries */ | |
175 | for (i = 0; i < sg_count; i++) { | |
176 | if (i == 0) { | |
177 | /* make sure 1st one does not have hole */ | |
178 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
179 | return i; | |
180 | } else if (i == sg_count - 1) { | |
181 | /* make sure last one does not have hole */ | |
182 | if (sgl[i].offset != 0) | |
183 | return i; | |
184 | } else { | |
185 | /* make sure no hole in the middle */ | |
186 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
187 | return i; | |
188 | } | |
189 | } | |
190 | return -1; | |
191 | } | |
192 | ||
a9753cbd S |
193 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
194 | unsigned int sg_count, | |
195 | unsigned int len) | |
196 | { | |
197 | int i; | |
198 | int num_pages; | |
199 | struct scatterlist *bounce_sgl; | |
200 | struct page *page_buf; | |
201 | ||
202 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
203 | ||
204 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
205 | if (!bounce_sgl) | |
206 | return NULL; | |
207 | ||
208 | for (i = 0; i < num_pages; i++) { | |
209 | page_buf = alloc_page(GFP_ATOMIC); | |
210 | if (!page_buf) | |
211 | goto cleanup; | |
212 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
213 | } | |
214 | ||
215 | return bounce_sgl; | |
216 | ||
217 | cleanup: | |
218 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
219 | return NULL; | |
220 | } | |
221 | ||
29fe2c9b S |
222 | |
223 | /* Assume the original sgl has enough room */ | |
224 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
225 | struct scatterlist *bounce_sgl, | |
226 | unsigned int orig_sgl_count) | |
227 | { | |
228 | int i; | |
229 | int j = 0; | |
230 | unsigned long src, dest; | |
231 | unsigned int srclen, destlen, copylen; | |
232 | unsigned int total_copied = 0; | |
233 | unsigned long bounce_addr = 0; | |
234 | unsigned long dest_addr = 0; | |
235 | unsigned long flags; | |
236 | ||
237 | local_irq_save(flags); | |
238 | ||
239 | for (i = 0; i < orig_sgl_count; i++) { | |
240 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
241 | KM_IRQ0) + orig_sgl[i].offset; | |
242 | dest = dest_addr; | |
243 | destlen = orig_sgl[i].length; | |
244 | ||
245 | if (bounce_addr == 0) | |
246 | bounce_addr = | |
247 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
248 | KM_IRQ0); | |
249 | ||
250 | while (destlen) { | |
251 | src = bounce_addr + bounce_sgl[j].offset; | |
252 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
253 | ||
254 | copylen = min(srclen, destlen); | |
255 | memcpy((void *)dest, (void *)src, copylen); | |
256 | ||
257 | total_copied += copylen; | |
258 | bounce_sgl[j].offset += copylen; | |
259 | destlen -= copylen; | |
260 | dest += copylen; | |
261 | ||
262 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
263 | /* full */ | |
264 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
265 | j++; | |
266 | ||
267 | /* if we need to use another bounce buffer */ | |
268 | if (destlen || i != orig_sgl_count - 1) | |
269 | bounce_addr = | |
270 | (unsigned long)kmap_atomic( | |
271 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
272 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
273 | /* unmap the last bounce that is < PAGE_SIZE */ | |
274 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
275 | } | |
276 | } | |
277 | ||
278 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
279 | KM_IRQ0); | |
280 | } | |
281 | ||
282 | local_irq_restore(flags); | |
283 | ||
284 | return total_copied; | |
285 | } | |
286 | ||
6a8ff44b S |
287 | |
288 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
289 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
290 | struct scatterlist *bounce_sgl, | |
291 | unsigned int orig_sgl_count) | |
292 | { | |
293 | int i; | |
294 | int j = 0; | |
295 | unsigned long src, dest; | |
296 | unsigned int srclen, destlen, copylen; | |
297 | unsigned int total_copied = 0; | |
298 | unsigned long bounce_addr = 0; | |
299 | unsigned long src_addr = 0; | |
300 | unsigned long flags; | |
301 | ||
302 | local_irq_save(flags); | |
303 | ||
304 | for (i = 0; i < orig_sgl_count; i++) { | |
305 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
306 | KM_IRQ0) + orig_sgl[i].offset; | |
307 | src = src_addr; | |
308 | srclen = orig_sgl[i].length; | |
309 | ||
310 | if (bounce_addr == 0) | |
311 | bounce_addr = | |
312 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
313 | KM_IRQ0); | |
314 | ||
315 | while (srclen) { | |
316 | /* assume bounce offset always == 0 */ | |
317 | dest = bounce_addr + bounce_sgl[j].length; | |
318 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
319 | ||
320 | copylen = min(srclen, destlen); | |
321 | memcpy((void *)dest, (void *)src, copylen); | |
322 | ||
323 | total_copied += copylen; | |
324 | bounce_sgl[j].length += copylen; | |
325 | srclen -= copylen; | |
326 | src += copylen; | |
327 | ||
328 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
329 | /* full..move to next entry */ | |
330 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
331 | j++; | |
332 | ||
333 | /* if we need to use another bounce buffer */ | |
334 | if (srclen || i != orig_sgl_count - 1) | |
335 | bounce_addr = | |
336 | (unsigned long)kmap_atomic( | |
337 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
338 | ||
339 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
340 | /* unmap the last bounce that is < PAGE_SIZE */ | |
341 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
342 | } | |
343 | } | |
344 | ||
345 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
346 | } | |
347 | ||
348 | local_irq_restore(flags); | |
349 | ||
350 | return total_copied; | |
351 | } | |
352 | ||
5c5c0234 S |
353 | |
354 | /* | |
355 | * storvsc_remove - Callback when our device is removed | |
356 | */ | |
357 | static int storvsc_remove(struct hv_device *dev) | |
358 | { | |
359 | struct storvsc_driver *storvsc_drv_obj = | |
360 | drv_to_stordrv(dev->device.driver); | |
361 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
362 | struct hv_host_device *host_dev = | |
363 | (struct hv_host_device *)host->hostdata; | |
364 | ||
365 | /* | |
366 | * Call to the vsc driver to let it know that the device is being | |
367 | * removed | |
368 | */ | |
369 | storvsc_drv_obj->base.dev_rm(dev); | |
370 | ||
371 | if (host_dev->request_pool) { | |
372 | kmem_cache_destroy(host_dev->request_pool); | |
373 | host_dev->request_pool = NULL; | |
374 | } | |
375 | ||
376 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
377 | scsi_remove_host(host); | |
378 | ||
379 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
380 | scsi_host_put(host); | |
381 | return 0; | |
382 | } | |
383 | ||
62838ce2 S |
384 | |
385 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
386 | sector_t capacity, int *info) | |
387 | { | |
388 | sector_t total_sectors = capacity; | |
389 | sector_t cylinder_times_heads = 0; | |
390 | sector_t temp = 0; | |
391 | ||
392 | int sectors_per_track = 0; | |
393 | int heads = 0; | |
394 | int cylinders = 0; | |
395 | int rem = 0; | |
396 | ||
397 | if (total_sectors > (65535 * 16 * 255)) | |
398 | total_sectors = (65535 * 16 * 255); | |
399 | ||
400 | if (total_sectors >= (65535 * 16 * 63)) { | |
401 | sectors_per_track = 255; | |
402 | heads = 16; | |
403 | ||
404 | cylinder_times_heads = total_sectors; | |
405 | /* sector_div stores the quotient in cylinder_times_heads */ | |
406 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
407 | } else { | |
408 | sectors_per_track = 17; | |
409 | ||
410 | cylinder_times_heads = total_sectors; | |
411 | /* sector_div stores the quotient in cylinder_times_heads */ | |
412 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
413 | ||
414 | temp = cylinder_times_heads + 1023; | |
415 | /* sector_div stores the quotient in temp */ | |
416 | rem = sector_div(temp, 1024); | |
417 | ||
418 | heads = temp; | |
419 | ||
420 | if (heads < 4) | |
421 | heads = 4; | |
422 | ||
423 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { | |
424 | sectors_per_track = 31; | |
425 | heads = 16; | |
426 | ||
427 | cylinder_times_heads = total_sectors; | |
428 | /* | |
429 | * sector_div stores the quotient in | |
430 | * cylinder_times_heads | |
431 | */ | |
432 | rem = sector_div(cylinder_times_heads, | |
433 | sectors_per_track); | |
434 | } | |
435 | ||
436 | if (cylinder_times_heads >= (heads * 1024)) { | |
437 | sectors_per_track = 63; | |
438 | heads = 16; | |
439 | ||
440 | cylinder_times_heads = total_sectors; | |
441 | /* | |
442 | * sector_div stores the quotient in | |
443 | * cylinder_times_heads | |
444 | */ | |
445 | rem = sector_div(cylinder_times_heads, | |
446 | sectors_per_track); | |
447 | } | |
448 | } | |
449 | ||
450 | temp = cylinder_times_heads; | |
451 | /* sector_div stores the quotient in temp */ | |
452 | rem = sector_div(temp, heads); | |
453 | cylinders = temp; | |
454 | ||
455 | info[0] = heads; | |
456 | info[1] = sectors_per_track; | |
457 | info[2] = cylinders; | |
458 | ||
459 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, | |
460 | sectors_per_track); | |
461 | ||
462 | return 0; | |
463 | } | |
454f18a9 | 464 | /* Static decl */ |
9efd21e1 | 465 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 466 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a | 467 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); |
bef4a34a | 468 | |
bef4a34a | 469 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
3afc7cc3 SH |
470 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
471 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 472 | |
454f18a9 | 473 | /* The one and only one */ |
2e79505d | 474 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 475 | |
454f18a9 | 476 | /* Scsi driver */ |
bef4a34a | 477 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
478 | .module = THIS_MODULE, |
479 | .name = "storvsc_host_t", | |
480 | .bios_param = storvsc_get_chs, | |
481 | .queuecommand = storvsc_queuecommand, | |
482 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
483 | .slave_alloc = storvsc_device_alloc, | |
484 | .slave_configure = storvsc_device_configure, | |
485 | .cmd_per_lun = 1, | |
486 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 487 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 488 | .this_id = -1, |
454f18a9 | 489 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
490 | /* currently 32 */ |
491 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
492 | /* | |
493 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
494 | * into 1 sg element. If set, we must limit the max_segment_size to | |
495 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
496 | * multiple | |
497 | */ | |
454f18a9 | 498 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 499 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 500 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 501 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
502 | }; |
503 | ||
504 | ||
3e189519 | 505 | /* |
ff568d3a GKH |
506 | * storvsc_drv_init - StorVsc driver initialization. |
507 | */ | |
db085777 | 508 | static int storvsc_drv_init(void) |
bef4a34a | 509 | { |
ff568d3a | 510 | int ret; |
2e79505d | 511 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 512 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 513 | |
8a046024 | 514 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 515 | |
454f18a9 | 516 | /* Callback to client driver to complete the initialization */ |
cf6fdfb3 | 517 | storvsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 518 | |
ff568d3a | 519 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 520 | "max outstanding reqs %u", |
8a046024 | 521 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 522 | |
8a046024 | 523 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
f8feed06 | 524 | STORVSC_MAX_IO_REQUESTS) |
bef4a34a | 525 | return -1; |
bef4a34a | 526 | |
150f9398 | 527 | drv->driver.name = storvsc_drv_obj->base.name; |
bef4a34a | 528 | |
9efd21e1 | 529 | drv->probe = storvsc_probe; |
415b023a | 530 | drv->remove = storvsc_remove; |
bef4a34a | 531 | |
454f18a9 | 532 | /* The driver belongs to vmbus */ |
150f9398 | 533 | ret = vmbus_child_driver_register(&drv->driver); |
bef4a34a | 534 | |
bef4a34a HJ |
535 | return ret; |
536 | } | |
537 | ||
af3043c6 | 538 | |
3d5f03fa | 539 | static int storvsc_host_reset(struct hv_device *device) |
af3043c6 S |
540 | { |
541 | struct storvsc_device *stor_device; | |
d7a1bdb9 | 542 | struct hv_storvsc_request *request; |
af3043c6 | 543 | struct vstor_packet *vstor_packet; |
93958465 | 544 | int ret, t; |
af3043c6 S |
545 | |
546 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
547 | ||
548 | stor_device = get_stor_device(device); | |
f8feed06 | 549 | if (!stor_device) |
af3043c6 | 550 | return -1; |
af3043c6 S |
551 | |
552 | request = &stor_device->reset_request; | |
553 | vstor_packet = &request->vstor_packet; | |
554 | ||
93958465 | 555 | init_completion(&request->wait_event); |
af3043c6 S |
556 | |
557 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
558 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
559 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
560 | ||
af3043c6 S |
561 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
562 | sizeof(struct vstor_packet), | |
563 | (unsigned long)&stor_device->reset_request, | |
564 | VM_PKT_DATA_INBAND, | |
565 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
f8feed06 | 566 | if (ret != 0) |
af3043c6 | 567 | goto cleanup; |
af3043c6 | 568 | |
93958465 S |
569 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
570 | if (t == 0) { | |
af3043c6 S |
571 | ret = -ETIMEDOUT; |
572 | goto cleanup; | |
573 | } | |
574 | ||
575 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
576 | ||
577 | /* | |
578 | * At this point, all outstanding requests in the adapter | |
579 | * should have been flushed out and return to us | |
580 | */ | |
581 | ||
582 | cleanup: | |
583 | put_stor_device(device); | |
584 | return ret; | |
585 | } | |
586 | ||
bef4a34a HJ |
587 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
588 | { | |
589 | struct device **curr = (struct device **)data; | |
590 | *curr = dev; | |
454f18a9 | 591 | return 1; /* stop iterating */ |
bef4a34a HJ |
592 | } |
593 | ||
bd1de709 | 594 | static void storvsc_drv_exit(void) |
bef4a34a | 595 | { |
2e79505d | 596 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 597 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 598 | struct device *current_dev = NULL; |
2295ba2e | 599 | int ret; |
bef4a34a | 600 | |
ff568d3a | 601 | while (1) { |
bef4a34a HJ |
602 | current_dev = NULL; |
603 | ||
454f18a9 | 604 | /* Get the device */ |
150f9398 | 605 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
606 | (void *) ¤t_dev, |
607 | storvsc_drv_exit_cb); | |
608 | ||
bef4a34a HJ |
609 | |
610 | if (current_dev == NULL) | |
611 | break; | |
612 | ||
454f18a9 | 613 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
614 | device_unregister(current_dev); |
615 | } | |
616 | ||
ca623ad3 HZ |
617 | if (storvsc_drv_obj->base.cleanup) |
618 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 619 | |
150f9398 | 620 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
621 | return; |
622 | } | |
623 | ||
3e189519 | 624 | /* |
ff568d3a GKH |
625 | * storvsc_probe - Add a new device for this driver |
626 | */ | |
9efd21e1 | 627 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 628 | { |
ff568d3a | 629 | int ret; |
2e79505d | 630 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 631 | drv_to_stordrv(device->device.driver); |
bef4a34a | 632 | struct Scsi_Host *host; |
795b613d | 633 | struct hv_host_device *host_dev; |
9f0c7d2c | 634 | struct storvsc_device_info device_info; |
bef4a34a | 635 | |
ca623ad3 | 636 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
637 | return -1; |
638 | ||
ff568d3a | 639 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 640 | sizeof(struct hv_host_device)); |
f8feed06 | 641 | if (!host) |
bef4a34a | 642 | return -ENOMEM; |
bef4a34a | 643 | |
9efd21e1 | 644 | dev_set_drvdata(&device->device, host); |
bef4a34a | 645 | |
795b613d S |
646 | host_dev = (struct hv_host_device *)host->hostdata; |
647 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 648 | |
795b613d | 649 | host_dev->port = host->host_no; |
97c15296 | 650 | host_dev->dev = device; |
bef4a34a | 651 | |
795b613d | 652 | host_dev->request_pool = |
9efd21e1 | 653 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 654 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
655 | SLAB_HWCACHE_ALIGN, NULL); |
656 | ||
795b613d | 657 | if (!host_dev->request_pool) { |
bef4a34a | 658 | scsi_host_put(host); |
bef4a34a HJ |
659 | return -ENOMEM; |
660 | } | |
661 | ||
8a046024 | 662 | device_info.port_number = host->host_no; |
454f18a9 | 663 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
664 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
665 | ||
ff568d3a | 666 | if (ret != 0) { |
795b613d | 667 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 668 | scsi_host_put(host); |
bef4a34a HJ |
669 | return -1; |
670 | } | |
671 | ||
795b613d S |
672 | host_dev->path = device_info.path_id; |
673 | host_dev->target = device_info.target_id; | |
bef4a34a | 674 | |
ff568d3a GKH |
675 | /* max # of devices per target */ |
676 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
677 | /* max # of targets per channel */ | |
678 | host->max_id = STORVSC_MAX_TARGETS; | |
679 | /* max # of channels */ | |
680 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 681 | |
454f18a9 | 682 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 683 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 684 | if (ret != 0) { |
bef4a34a | 685 | |
9efd21e1 | 686 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a | 687 | |
795b613d | 688 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 689 | scsi_host_put(host); |
bef4a34a HJ |
690 | return -1; |
691 | } | |
692 | ||
693 | scsi_scan_host(host); | |
bef4a34a HJ |
694 | return ret; |
695 | } | |
696 | ||
3e189519 | 697 | /* |
ff568d3a GKH |
698 | * storvsc_commmand_completion - Command completion processing |
699 | */ | |
0b3f6834 | 700 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 701 | { |
ff568d3a | 702 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 703 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 704 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
795b613d | 705 | struct hv_host_device *host_dev = |
972621c9 | 706 | (struct hv_host_device *)scmnd->device->host->hostdata; |
bef4a34a | 707 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 708 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 709 | struct vmscsi_request *vm_srb; |
bef4a34a | 710 | |
b856e738 BP |
711 | /* ASSERT(request == &cmd_request->request); */ |
712 | /* ASSERT(scmnd); */ | |
713 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
714 | /* (unsigned long)cmd_request); */ | |
715 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 716 | |
ff568d3a GKH |
717 | if (cmd_request->bounce_sgl_count) { |
718 | /* using bounce buffer */ | |
454f18a9 | 719 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 720 | |
454f18a9 | 721 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
722 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
723 | cmd_request->bounce_sgl, | |
724 | scsi_sg_count(scmnd)); | |
725 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
726 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
727 | } |
728 | ||
d7a1bdb9 | 729 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 730 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 731 | |
ff568d3a GKH |
732 | if (scmnd->result) { |
733 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 734 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 735 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
736 | } |
737 | ||
8a046024 HJ |
738 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
739 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 740 | request->data_buffer.len - |
e9e936c6 | 741 | vm_srb->data_transfer_length); |
bef4a34a HJ |
742 | |
743 | scsi_done_fn = scmnd->scsi_done; | |
744 | ||
745 | scmnd->host_scribble = NULL; | |
746 | scmnd->scsi_done = NULL; | |
747 | ||
454f18a9 | 748 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
749 | scsi_done_fn(scmnd); |
750 | ||
795b613d | 751 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
752 | } |
753 | ||
3e189519 | 754 | /* |
ff568d3a GKH |
755 | * storvsc_queuecommand - Initiate command processing |
756 | */ | |
f281233d | 757 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 758 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 759 | { |
ff568d3a | 760 | int ret; |
795b613d | 761 | struct hv_host_device *host_dev = |
972621c9 | 762 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 763 | struct hv_device *dev = host_dev->dev; |
2e79505d | 764 | struct storvsc_driver *storvsc_drv_obj = |
c2ad4830 | 765 | drv_to_stordrv(dev->device.driver); |
0b3f6834 | 766 | struct hv_storvsc_request *request; |
bef4a34a | 767 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 768 | unsigned int request_size = 0; |
bef4a34a HJ |
769 | int i; |
770 | struct scatterlist *sgl; | |
77c5ceaf | 771 | unsigned int sg_count = 0; |
12fbd416 | 772 | struct vmscsi_request *vm_srb; |
bef4a34a | 773 | |
bef4a34a | 774 | |
454f18a9 | 775 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 776 | if (scmnd->host_scribble) { |
b856e738 | 777 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 778 | |
ff568d3a GKH |
779 | cmd_request = |
780 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
781 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
782 | scmnd, cmd_request); | |
bef4a34a HJ |
783 | |
784 | goto retry_request; | |
785 | } | |
786 | ||
b856e738 BP |
787 | /* ASSERT(scmnd->scsi_done == NULL); */ |
788 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
789 | |
790 | scmnd->scsi_done = done; | |
791 | ||
792 | request_size = sizeof(struct storvsc_cmd_request); | |
793 | ||
795b613d | 794 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
ff568d3a GKH |
795 | GFP_ATOMIC); |
796 | if (!cmd_request) { | |
bef4a34a HJ |
797 | scmnd->scsi_done = NULL; |
798 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
799 | } | |
800 | ||
454f18a9 | 801 | /* Setup the cmd request */ |
bef4a34a HJ |
802 | cmd_request->bounce_sgl_count = 0; |
803 | cmd_request->bounce_sgl = NULL; | |
804 | cmd_request->cmd = scmnd; | |
805 | ||
ff568d3a | 806 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
807 | |
808 | request = &cmd_request->request; | |
d7a1bdb9 | 809 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 810 | |
bef4a34a | 811 | |
454f18a9 | 812 | /* Build the SRB */ |
ff568d3a | 813 | switch (scmnd->sc_data_direction) { |
bef4a34a | 814 | case DMA_TO_DEVICE: |
12fbd416 | 815 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
816 | break; |
817 | case DMA_FROM_DEVICE: | |
12fbd416 | 818 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
819 | break; |
820 | default: | |
12fbd416 | 821 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
822 | break; |
823 | } | |
824 | ||
d7a1bdb9 S |
825 | request->on_io_completion = storvsc_commmand_completion; |
826 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 827 | |
454f18a9 | 828 | /* request->PortId = scmnd->device->channel; */ |
795b613d | 829 | vm_srb->port_number = host_dev->port; |
735625fe | 830 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 831 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 832 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 833 | |
b856e738 | 834 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 835 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
836 | |
837 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 838 | |
d7a1bdb9 | 839 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
840 | |
841 | ||
d7a1bdb9 | 842 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
843 | if (scsi_sg_count(scmnd)) { |
844 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 845 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 846 | |
454f18a9 | 847 | /* check if we need to bounce the sgl */ |
ff568d3a | 848 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
ff568d3a GKH |
849 | cmd_request->bounce_sgl = |
850 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
851 | scsi_bufflen(scmnd)); | |
852 | if (!cmd_request->bounce_sgl) { | |
bef4a34a HJ |
853 | scmnd->scsi_done = NULL; |
854 | scmnd->host_scribble = NULL; | |
795b613d | 855 | kmem_cache_free(host_dev->request_pool, |
ff568d3a | 856 | cmd_request); |
bef4a34a HJ |
857 | |
858 | return SCSI_MLQUEUE_HOST_BUSY; | |
859 | } | |
860 | ||
ff568d3a | 861 | cmd_request->bounce_sgl_count = |
73509681 | 862 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 863 | PAGE_SHIFT; |
bef4a34a | 864 | |
ff568d3a GKH |
865 | /* |
866 | * FIXME: We can optimize on reads by just skipping | |
867 | * this | |
868 | */ | |
869 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
870 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
871 | |
872 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 873 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
874 | } |
875 | ||
d7a1bdb9 | 876 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 877 | |
f8feed06 | 878 | for (i = 0; i < sg_count; i++) |
d7a1bdb9 | 879 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 880 | page_to_pfn(sg_page((&sgl[i]))); |
f8feed06 | 881 | |
ff568d3a | 882 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 883 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 884 | request->data_buffer.offset = |
ff568d3a | 885 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 886 | request->data_buffer.pfn_array[0] = |
ff568d3a | 887 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 888 | } |
bef4a34a HJ |
889 | |
890 | retry_request: | |
454f18a9 | 891 | /* Invokes the vsc to start an IO */ |
c2ad4830 | 892 | ret = storvsc_drv_obj->on_io_request(dev, |
ff568d3a GKH |
893 | &cmd_request->request); |
894 | if (ret == -1) { | |
895 | /* no more space */ | |
ff568d3a GKH |
896 | |
897 | if (cmd_request->bounce_sgl_count) { | |
898 | /* | |
899 | * FIXME: We can optimize on writes by just skipping | |
900 | * this | |
901 | */ | |
902 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
903 | cmd_request->bounce_sgl, | |
904 | scsi_sg_count(scmnd)); | |
905 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
906 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
907 | } |
908 | ||
795b613d | 909 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
910 | |
911 | scmnd->scsi_done = NULL; | |
912 | scmnd->host_scribble = NULL; | |
913 | ||
914 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
915 | } | |
916 | ||
bef4a34a HJ |
917 | return ret; |
918 | } | |
919 | ||
f281233d JG |
920 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
921 | ||
3e189519 | 922 | /* |
ff568d3a GKH |
923 | * storvsc_host_reset_handler - Reset the scsi HBA |
924 | */ | |
bef4a34a HJ |
925 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
926 | { | |
ff568d3a | 927 | int ret; |
795b613d | 928 | struct hv_host_device *host_dev = |
972621c9 | 929 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 930 | struct hv_device *dev = host_dev->dev; |
bef4a34a | 931 | |
ff568d3a | 932 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
c2ad4830 | 933 | scmnd->device, dev); |
bef4a34a | 934 | |
454f18a9 | 935 | /* Invokes the vsc to reset the host/bus */ |
3d5f03fa | 936 | ret = storvsc_host_reset(dev); |
83c720ea | 937 | if (ret != 0) |
bef4a34a | 938 | return ret; |
bef4a34a | 939 | |
ff568d3a | 940 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
c2ad4830 | 941 | scmnd->device, dev); |
bef4a34a | 942 | |
bef4a34a HJ |
943 | return ret; |
944 | } | |
945 | ||
bef4a34a HJ |
946 | static int __init storvsc_init(void) |
947 | { | |
948 | int ret; | |
949 | ||
bef4a34a | 950 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 951 | ret = storvsc_drv_init(); |
bef4a34a HJ |
952 | return ret; |
953 | } | |
954 | ||
955 | static void __exit storvsc_exit(void) | |
956 | { | |
bef4a34a | 957 | storvsc_drv_exit(); |
bef4a34a HJ |
958 | } |
959 | ||
ff568d3a | 960 | MODULE_LICENSE("GPL"); |
26c14cc1 | 961 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 962 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
963 | module_init(storvsc_init); |
964 | module_exit(storvsc_exit); |