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 | */ |
a1be1706 S |
22 | |
23 | #include <linux/kernel.h> | |
f0d79fe9 | 24 | #include <linux/wait.h> |
a1be1706 S |
25 | #include <linux/sched.h> |
26 | #include <linux/completion.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/delay.h> | |
bef4a34a | 30 | #include <linux/init.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
bef4a34a HJ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> | |
46a97191 | 34 | #include <linux/hyperv.h> |
4e03e697 | 35 | #include <linux/mempool.h> |
bef4a34a HJ |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_tcq.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 43 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 44 | |
09f0355f | 45 | /* |
af9584b8 S |
46 | * All wire protocol details (storage protocol between the guest and the host) |
47 | * are consolidated here. | |
48 | * | |
49 | * Begin protocol definitions. | |
09f0355f S |
50 | */ |
51 | ||
09f0355f S |
52 | /* |
53 | * Version history: | |
54 | * V1 Beta: 0.1 | |
55 | * V1 RC < 2008/1/31: 1.0 | |
56 | * V1 RC > 2008/1/31: 2.0 | |
57 | * Win7: 4.2 | |
58 | */ | |
59 | ||
85904a5e S |
60 | #define VMSTOR_CURRENT_MAJOR 4 |
61 | #define VMSTOR_CURRENT_MINOR 2 | |
f0d79fe9 S |
62 | |
63 | ||
f0d79fe9 S |
64 | /* Packet structure describing virtual storage requests. */ |
65 | enum vstor_packet_operation { | |
66 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
67 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
68 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
69 | VSTOR_OPERATION_RESET_LUN = 4, | |
70 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
71 | VSTOR_OPERATION_RESET_BUS = 6, | |
72 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
73 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
74 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
75 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
76 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
77 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
78 | }; |
79 | ||
80 | /* | |
81 | * Platform neutral description of a scsi request - | |
82 | * this remains the same across the write regardless of 32/64 bit | |
83 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
84 | */ | |
6b2f9495 S |
85 | #define STORVSC_MAX_CMD_LEN 0x10 |
86 | #define STORVSC_SENSE_BUFFER_SIZE 0x12 | |
87 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 | |
f0d79fe9 S |
88 | |
89 | struct vmscsi_request { | |
c649114a S |
90 | u16 length; |
91 | u8 srb_status; | |
92 | u8 scsi_status; | |
f0d79fe9 | 93 | |
c649114a S |
94 | u8 port_number; |
95 | u8 path_id; | |
96 | u8 target_id; | |
97 | u8 lun; | |
f0d79fe9 | 98 | |
c649114a S |
99 | u8 cdb_length; |
100 | u8 sense_info_length; | |
101 | u8 data_in; | |
102 | u8 reserved; | |
f0d79fe9 | 103 | |
c649114a | 104 | u32 data_transfer_length; |
f0d79fe9 S |
105 | |
106 | union { | |
6b2f9495 S |
107 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
108 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
109 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 S |
110 | }; |
111 | } __attribute((packed)); | |
112 | ||
113 | ||
114 | /* | |
115 | * This structure is sent during the intialization phase to get the different | |
116 | * properties of the channel. | |
117 | */ | |
118 | struct vmstorage_channel_properties { | |
c649114a S |
119 | u16 protocol_version; |
120 | u8 path_id; | |
121 | u8 target_id; | |
f0d79fe9 S |
122 | |
123 | /* Note: port number is only really known on the client side */ | |
c649114a S |
124 | u32 port_number; |
125 | u32 flags; | |
126 | u32 max_transfer_bytes; | |
f0d79fe9 | 127 | |
c649114a S |
128 | /* |
129 | * This id is unique for each channel and will correspond with | |
130 | * vendor specific data in the inquiry data. | |
131 | */ | |
132 | ||
133 | u64 unique_id; | |
f0d79fe9 S |
134 | } __packed; |
135 | ||
136 | /* This structure is sent during the storage protocol negotiations. */ | |
137 | struct vmstorage_protocol_version { | |
138 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 139 | u16 major_minor; |
f0d79fe9 S |
140 | |
141 | /* | |
142 | * Revision number is auto-incremented whenever this file is changed | |
143 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
144 | * definitely indicate incompatibility--but it does indicate mismatched | |
145 | * builds. | |
c649114a | 146 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 147 | */ |
85904a5e | 148 | u16 revision; |
f0d79fe9 S |
149 | } __packed; |
150 | ||
151 | /* Channel Property Flags */ | |
152 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
153 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
154 | ||
155 | struct vstor_packet { | |
156 | /* Requested operation type */ | |
157 | enum vstor_packet_operation operation; | |
158 | ||
159 | /* Flags - see below for values */ | |
c649114a | 160 | u32 flags; |
f0d79fe9 S |
161 | |
162 | /* Status of the request returned from the server side. */ | |
c649114a | 163 | u32 status; |
f0d79fe9 S |
164 | |
165 | /* Data payload area */ | |
166 | union { | |
167 | /* | |
168 | * Structure used to forward SCSI commands from the | |
169 | * client to the server. | |
170 | */ | |
171 | struct vmscsi_request vm_srb; | |
172 | ||
173 | /* Structure used to query channel properties. */ | |
174 | struct vmstorage_channel_properties storage_channel_properties; | |
175 | ||
176 | /* Used during version negotiations. */ | |
177 | struct vmstorage_protocol_version version; | |
178 | }; | |
179 | } __packed; | |
180 | ||
f0d79fe9 | 181 | /* |
09f0355f S |
182 | * Packet Flags: |
183 | * | |
f0d79fe9 S |
184 | * This flag indicates that the server should send back a completion for this |
185 | * packet. | |
186 | */ | |
09f0355f | 187 | |
f0d79fe9 S |
188 | #define REQUEST_COMPLETION_FLAG 0x1 |
189 | ||
f0d79fe9 S |
190 | /* Matches Windows-end */ |
191 | enum storvsc_request_type { | |
c649114a | 192 | WRITE_TYPE = 0, |
f0d79fe9 S |
193 | READ_TYPE, |
194 | UNKNOWN_TYPE, | |
195 | }; | |
196 | ||
16046320 S |
197 | /* |
198 | * SRB status codes and masks; a subset of the codes used here. | |
199 | */ | |
200 | ||
201 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
202 | #define SRB_STATUS_INVALID_LUN 0x20 | |
203 | #define SRB_STATUS_SUCCESS 0x01 | |
204 | #define SRB_STATUS_ERROR 0x04 | |
205 | ||
af9584b8 S |
206 | /* |
207 | * This is the end of Protocol specific defines. | |
208 | */ | |
209 | ||
210 | ||
211 | /* | |
212 | * We setup a mempool to allocate request structures for this driver | |
213 | * on a per-lun basis. The following define specifies the number of | |
214 | * elements in the pool. | |
215 | */ | |
216 | ||
217 | #define STORVSC_MIN_BUF_NR 64 | |
218 | static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); | |
219 | ||
220 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
221 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
222 | ||
223 | #define STORVSC_MAX_IO_REQUESTS 128 | |
224 | ||
225 | /* | |
226 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
227 | * reality, the path/target is not used (ie always set to 0) so our | |
228 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
229 | * up to 256 luns. | |
230 | */ | |
231 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
232 | #define STORVSC_MAX_TARGETS 1 | |
233 | #define STORVSC_MAX_CHANNELS 1 | |
234 | ||
235 | ||
16046320 | 236 | |
61eaffc9 S |
237 | struct storvsc_cmd_request { |
238 | struct list_head entry; | |
239 | struct scsi_cmnd *cmd; | |
240 | ||
241 | unsigned int bounce_sgl_count; | |
242 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 243 | |
f0d79fe9 S |
244 | struct hv_device *device; |
245 | ||
246 | /* Synchronize the request/response if needed */ | |
247 | struct completion wait_event; | |
248 | ||
249 | unsigned char *sense_buffer; | |
f0d79fe9 | 250 | struct hv_multipage_buffer data_buffer; |
f0d79fe9 S |
251 | struct vstor_packet vstor_packet; |
252 | }; | |
253 | ||
254 | ||
f0d79fe9 S |
255 | /* A storvsc device is a device object that contains a vmbus channel */ |
256 | struct storvsc_device { | |
257 | struct hv_device *device; | |
258 | ||
259 | bool destroy; | |
260 | bool drain_notify; | |
261 | atomic_t num_outstanding_req; | |
cd654ea1 | 262 | struct Scsi_Host *host; |
f0d79fe9 S |
263 | |
264 | wait_queue_head_t waiting_to_drain; | |
265 | ||
266 | /* | |
267 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
268 | * controller. In reality, the pathid, targetid is always 0 | |
269 | * and the port is set by us | |
270 | */ | |
271 | unsigned int port_number; | |
272 | unsigned char path_id; | |
273 | unsigned char target_id; | |
274 | ||
275 | /* Used for vsc/vsp channel reset process */ | |
61eaffc9 S |
276 | struct storvsc_cmd_request init_request; |
277 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
278 | }; |
279 | ||
ce3e301c | 280 | struct stor_mem_pools { |
c1b3d067 | 281 | struct kmem_cache *request_pool; |
4e03e697 | 282 | mempool_t *request_mempool; |
ce3e301c S |
283 | }; |
284 | ||
285 | struct hv_host_device { | |
286 | struct hv_device *dev; | |
c1b3d067 S |
287 | unsigned int port; |
288 | unsigned char path; | |
289 | unsigned char target; | |
290 | }; | |
291 | ||
12675799 S |
292 | struct storvsc_scan_work { |
293 | struct work_struct work; | |
294 | struct Scsi_Host *host; | |
295 | uint lun; | |
296 | }; | |
297 | ||
298 | static void storvsc_bus_scan(struct work_struct *work) | |
299 | { | |
300 | struct storvsc_scan_work *wrk; | |
301 | int id, order_id; | |
302 | ||
303 | wrk = container_of(work, struct storvsc_scan_work, work); | |
304 | for (id = 0; id < wrk->host->max_id; ++id) { | |
305 | if (wrk->host->reverse_ordering) | |
306 | order_id = wrk->host->max_id - id - 1; | |
307 | else | |
308 | order_id = id; | |
309 | ||
310 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
311 | order_id, SCAN_WILD_CARD, 1); | |
312 | } | |
313 | kfree(wrk); | |
314 | } | |
315 | ||
b4017319 S |
316 | static void storvsc_remove_lun(struct work_struct *work) |
317 | { | |
318 | struct storvsc_scan_work *wrk; | |
319 | struct scsi_device *sdev; | |
320 | ||
321 | wrk = container_of(work, struct storvsc_scan_work, work); | |
322 | if (!scsi_host_get(wrk->host)) | |
323 | goto done; | |
324 | ||
325 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
326 | ||
327 | if (sdev) { | |
328 | scsi_remove_device(sdev); | |
329 | scsi_device_put(sdev); | |
330 | } | |
331 | scsi_host_put(wrk->host); | |
332 | ||
333 | done: | |
334 | kfree(wrk); | |
335 | } | |
336 | ||
af9584b8 S |
337 | /* |
338 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
339 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
340 | */ | |
341 | ||
342 | static inline u16 storvsc_get_version(u8 major, u8 minor) | |
343 | { | |
344 | u16 version; | |
345 | ||
346 | version = ((major << 8) | minor); | |
347 | return version; | |
348 | } | |
349 | ||
a8c18c57 S |
350 | /* |
351 | * We can get incoming messages from the host that are not in response to | |
352 | * messages that we have sent out. An example of this would be messages | |
353 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
354 | * deal with potential race conditions where the driver may be in the | |
355 | * midst of being unloaded when we might receive an unsolicited message | |
356 | * from the host, we have implemented a mechanism to gurantee sequential | |
357 | * consistency: | |
358 | * | |
359 | * 1) Once the device is marked as being destroyed, we will fail all | |
360 | * outgoing messages. | |
361 | * 2) We permit incoming messages when the device is being destroyed, | |
362 | * only to properly account for messages already sent out. | |
363 | */ | |
364 | ||
f0d79fe9 S |
365 | static inline struct storvsc_device *get_out_stor_device( |
366 | struct hv_device *device) | |
367 | { | |
368 | struct storvsc_device *stor_device; | |
369 | ||
cd654ea1 | 370 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
371 | |
372 | if (stor_device && stor_device->destroy) | |
373 | stor_device = NULL; | |
374 | ||
375 | return stor_device; | |
376 | } | |
377 | ||
378 | ||
379 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
380 | { | |
381 | dev->drain_notify = true; | |
382 | wait_event(dev->waiting_to_drain, | |
383 | atomic_read(&dev->num_outstanding_req) == 0); | |
384 | dev->drain_notify = false; | |
385 | } | |
bef4a34a | 386 | |
8dcf37d4 S |
387 | static inline struct storvsc_device *get_in_stor_device( |
388 | struct hv_device *device) | |
389 | { | |
390 | struct storvsc_device *stor_device; | |
8dcf37d4 | 391 | |
cd654ea1 | 392 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
393 | |
394 | if (!stor_device) | |
395 | goto get_in_err; | |
396 | ||
397 | /* | |
398 | * If the device is being destroyed; allow incoming | |
399 | * traffic only to cleanup outstanding requests. | |
400 | */ | |
401 | ||
402 | if (stor_device->destroy && | |
403 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
404 | stor_device = NULL; | |
405 | ||
406 | get_in_err: | |
8dcf37d4 S |
407 | return stor_device; |
408 | ||
409 | } | |
410 | ||
2707388c S |
411 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
412 | unsigned int sg_count) | |
413 | { | |
414 | int i; | |
415 | struct page *page_buf; | |
416 | ||
417 | for (i = 0; i < sg_count; i++) { | |
418 | page_buf = sg_page((&sgl[i])); | |
419 | if (page_buf != NULL) | |
420 | __free_page(page_buf); | |
421 | } | |
422 | ||
423 | kfree(sgl); | |
424 | } | |
425 | ||
426 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
427 | { | |
428 | int i; | |
429 | ||
430 | /* No need to check */ | |
431 | if (sg_count < 2) | |
432 | return -1; | |
433 | ||
434 | /* We have at least 2 sg entries */ | |
435 | for (i = 0; i < sg_count; i++) { | |
436 | if (i == 0) { | |
437 | /* make sure 1st one does not have hole */ | |
438 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
439 | return i; | |
440 | } else if (i == sg_count - 1) { | |
441 | /* make sure last one does not have hole */ | |
442 | if (sgl[i].offset != 0) | |
443 | return i; | |
444 | } else { | |
445 | /* make sure no hole in the middle */ | |
446 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
447 | return i; | |
448 | } | |
449 | } | |
450 | return -1; | |
451 | } | |
452 | ||
453 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
454 | unsigned int sg_count, | |
455 | unsigned int len, | |
456 | int write) | |
457 | { | |
458 | int i; | |
459 | int num_pages; | |
460 | struct scatterlist *bounce_sgl; | |
461 | struct page *page_buf; | |
462 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
463 | ||
464 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
465 | ||
466 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
467 | if (!bounce_sgl) | |
468 | return NULL; | |
469 | ||
9d2696e6 | 470 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
471 | for (i = 0; i < num_pages; i++) { |
472 | page_buf = alloc_page(GFP_ATOMIC); | |
473 | if (!page_buf) | |
474 | goto cleanup; | |
475 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
476 | } | |
477 | ||
478 | return bounce_sgl; | |
479 | ||
480 | cleanup: | |
481 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
482 | return NULL; | |
483 | } | |
484 | ||
9f393834 LT |
485 | /* Disgusting wrapper functions */ |
486 | static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) | |
487 | { | |
488 | void *addr = kmap_atomic(sg_page(sgl + idx)); | |
489 | return (unsigned long)addr; | |
490 | } | |
8dcf37d4 | 491 | |
9f393834 LT |
492 | static inline void sg_kunmap_atomic(unsigned long addr) |
493 | { | |
494 | kunmap_atomic((void *)addr); | |
495 | } | |
8dcf37d4 | 496 | |
8dcf37d4 | 497 | |
2707388c S |
498 | /* Assume the original sgl has enough room */ |
499 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
500 | struct scatterlist *bounce_sgl, | |
501 | unsigned int orig_sgl_count, | |
502 | unsigned int bounce_sgl_count) | |
503 | { | |
504 | int i; | |
505 | int j = 0; | |
506 | unsigned long src, dest; | |
507 | unsigned int srclen, destlen, copylen; | |
508 | unsigned int total_copied = 0; | |
509 | unsigned long bounce_addr = 0; | |
510 | unsigned long dest_addr = 0; | |
511 | unsigned long flags; | |
512 | ||
513 | local_irq_save(flags); | |
514 | ||
515 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 516 | dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
517 | dest = dest_addr; |
518 | destlen = orig_sgl[i].length; | |
519 | ||
520 | if (bounce_addr == 0) | |
9f393834 | 521 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
522 | |
523 | while (destlen) { | |
524 | src = bounce_addr + bounce_sgl[j].offset; | |
525 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
526 | ||
527 | copylen = min(srclen, destlen); | |
528 | memcpy((void *)dest, (void *)src, copylen); | |
529 | ||
530 | total_copied += copylen; | |
531 | bounce_sgl[j].offset += copylen; | |
532 | destlen -= copylen; | |
533 | dest += copylen; | |
534 | ||
535 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
536 | /* full */ | |
9f393834 | 537 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
538 | j++; |
539 | ||
540 | /* | |
541 | * It is possible that the number of elements | |
542 | * in the bounce buffer may not be equal to | |
543 | * the number of elements in the original | |
544 | * scatter list. Handle this correctly. | |
545 | */ | |
546 | ||
547 | if (j == bounce_sgl_count) { | |
548 | /* | |
549 | * We are done; cleanup and return. | |
550 | */ | |
9f393834 | 551 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
552 | local_irq_restore(flags); |
553 | return total_copied; | |
554 | } | |
555 | ||
556 | /* if we need to use another bounce buffer */ | |
557 | if (destlen || i != orig_sgl_count - 1) | |
9f393834 | 558 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
559 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
560 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 561 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
562 | } |
563 | } | |
564 | ||
9f393834 | 565 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
566 | } |
567 | ||
568 | local_irq_restore(flags); | |
569 | ||
570 | return total_copied; | |
571 | } | |
572 | ||
573 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
574 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
575 | struct scatterlist *bounce_sgl, | |
576 | unsigned int orig_sgl_count) | |
577 | { | |
578 | int i; | |
579 | int j = 0; | |
580 | unsigned long src, dest; | |
581 | unsigned int srclen, destlen, copylen; | |
582 | unsigned int total_copied = 0; | |
583 | unsigned long bounce_addr = 0; | |
584 | unsigned long src_addr = 0; | |
585 | unsigned long flags; | |
586 | ||
587 | local_irq_save(flags); | |
588 | ||
589 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 590 | src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
591 | src = src_addr; |
592 | srclen = orig_sgl[i].length; | |
593 | ||
594 | if (bounce_addr == 0) | |
9f393834 | 595 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
596 | |
597 | while (srclen) { | |
598 | /* assume bounce offset always == 0 */ | |
599 | dest = bounce_addr + bounce_sgl[j].length; | |
600 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
601 | ||
602 | copylen = min(srclen, destlen); | |
603 | memcpy((void *)dest, (void *)src, copylen); | |
604 | ||
605 | total_copied += copylen; | |
606 | bounce_sgl[j].length += copylen; | |
607 | srclen -= copylen; | |
608 | src += copylen; | |
609 | ||
610 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
611 | /* full..move to next entry */ | |
9f393834 | 612 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
613 | j++; |
614 | ||
615 | /* if we need to use another bounce buffer */ | |
616 | if (srclen || i != orig_sgl_count - 1) | |
9f393834 | 617 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
618 | |
619 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
620 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 621 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
622 | } |
623 | } | |
624 | ||
9f393834 | 625 | sg_kunmap_atomic(src_addr - orig_sgl[i].offset); |
2707388c S |
626 | } |
627 | ||
628 | local_irq_restore(flags); | |
629 | ||
630 | return total_copied; | |
631 | } | |
632 | ||
8dcf37d4 S |
633 | static int storvsc_channel_init(struct hv_device *device) |
634 | { | |
635 | struct storvsc_device *stor_device; | |
61eaffc9 | 636 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
637 | struct vstor_packet *vstor_packet; |
638 | int ret, t; | |
639 | ||
640 | stor_device = get_out_stor_device(device); | |
641 | if (!stor_device) | |
642 | return -ENODEV; | |
643 | ||
644 | request = &stor_device->init_request; | |
645 | vstor_packet = &request->vstor_packet; | |
646 | ||
647 | /* | |
648 | * Now, initiate the vsc/vsp initialization protocol on the open | |
649 | * channel | |
650 | */ | |
61eaffc9 | 651 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
652 | init_completion(&request->wait_event); |
653 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
654 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
655 | ||
656 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
657 | sizeof(struct vstor_packet), | |
658 | (unsigned long)request, | |
659 | VM_PKT_DATA_INBAND, | |
660 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
661 | if (ret != 0) | |
662 | goto cleanup; | |
663 | ||
664 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
665 | if (t == 0) { | |
666 | ret = -ETIMEDOUT; | |
667 | goto cleanup; | |
668 | } | |
669 | ||
670 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
671 | vstor_packet->status != 0) | |
672 | goto cleanup; | |
673 | ||
674 | ||
675 | /* reuse the packet for version range supported */ | |
676 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
677 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
678 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
679 | ||
85904a5e S |
680 | vstor_packet->version.major_minor = |
681 | storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR); | |
682 | ||
683 | /* | |
684 | * The revision number is only used in Windows; set it to 0. | |
685 | */ | |
c649114a | 686 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
687 | |
688 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
689 | sizeof(struct vstor_packet), | |
690 | (unsigned long)request, | |
691 | VM_PKT_DATA_INBAND, | |
692 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
693 | if (ret != 0) | |
694 | goto cleanup; | |
695 | ||
696 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
697 | if (t == 0) { | |
698 | ret = -ETIMEDOUT; | |
699 | goto cleanup; | |
700 | } | |
701 | ||
702 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
703 | vstor_packet->status != 0) | |
704 | goto cleanup; | |
705 | ||
706 | ||
707 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
708 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
709 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
710 | vstor_packet->storage_channel_properties.port_number = | |
711 | stor_device->port_number; | |
712 | ||
713 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
714 | sizeof(struct vstor_packet), | |
715 | (unsigned long)request, | |
716 | VM_PKT_DATA_INBAND, | |
717 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
718 | ||
719 | if (ret != 0) | |
720 | goto cleanup; | |
721 | ||
722 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
723 | if (t == 0) { | |
724 | ret = -ETIMEDOUT; | |
725 | goto cleanup; | |
726 | } | |
727 | ||
728 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
729 | vstor_packet->status != 0) | |
730 | goto cleanup; | |
731 | ||
732 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
733 | stor_device->target_id | |
734 | = vstor_packet->storage_channel_properties.target_id; | |
735 | ||
736 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
737 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
738 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
739 | ||
740 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
741 | sizeof(struct vstor_packet), | |
742 | (unsigned long)request, | |
743 | VM_PKT_DATA_INBAND, | |
744 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
745 | ||
746 | if (ret != 0) | |
747 | goto cleanup; | |
748 | ||
749 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
750 | if (t == 0) { | |
751 | ret = -ETIMEDOUT; | |
752 | goto cleanup; | |
753 | } | |
754 | ||
755 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
756 | vstor_packet->status != 0) | |
757 | goto cleanup; | |
758 | ||
759 | ||
760 | cleanup: | |
761 | return ret; | |
762 | } | |
763 | ||
c50bd448 S |
764 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
765 | struct scsi_cmnd *scmnd, | |
766 | struct Scsi_Host *host, | |
767 | u8 asc, u8 ascq) | |
768 | { | |
769 | struct storvsc_scan_work *wrk; | |
770 | void (*process_err_fn)(struct work_struct *work); | |
771 | bool do_work = false; | |
772 | ||
773 | switch (vm_srb->srb_status) { | |
774 | case SRB_STATUS_ERROR: | |
775 | /* | |
776 | * If there is an error; offline the device since all | |
777 | * error recovery strategies would have already been | |
778 | * deployed on the host side. However, if the command | |
779 | * were a pass-through command deal with it appropriately. | |
780 | */ | |
781 | switch (scmnd->cmnd[0]) { | |
782 | case ATA_16: | |
783 | case ATA_12: | |
784 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
785 | break; | |
786 | default: | |
787 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
788 | } | |
789 | break; | |
790 | case SRB_STATUS_INVALID_LUN: | |
791 | do_work = true; | |
792 | process_err_fn = storvsc_remove_lun; | |
793 | break; | |
794 | } | |
795 | if (!do_work) | |
796 | return; | |
797 | ||
798 | /* | |
799 | * We need to schedule work to process this error; schedule it. | |
800 | */ | |
801 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
802 | if (!wrk) { | |
803 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
804 | return; | |
805 | } | |
806 | ||
807 | wrk->host = host; | |
808 | wrk->lun = vm_srb->lun; | |
809 | INIT_WORK(&wrk->work, process_err_fn); | |
810 | schedule_work(&wrk->work); | |
811 | } | |
812 | ||
2707388c | 813 | |
61eaffc9 | 814 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 815 | { |
2707388c S |
816 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
817 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
818 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
819 | struct scsi_sense_hdr sense_hdr; | |
820 | struct vmscsi_request *vm_srb; | |
2707388c | 821 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c50bd448 S |
822 | struct Scsi_Host *host; |
823 | struct storvsc_device *stor_dev; | |
824 | struct hv_device *dev = host_dev->dev; | |
825 | ||
826 | stor_dev = get_in_stor_device(dev); | |
827 | host = stor_dev->host; | |
8dcf37d4 | 828 | |
61eaffc9 | 829 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
830 | if (cmd_request->bounce_sgl_count) { |
831 | if (vm_srb->data_in == READ_TYPE) | |
832 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
833 | cmd_request->bounce_sgl, | |
834 | scsi_sg_count(scmnd), | |
835 | cmd_request->bounce_sgl_count); | |
836 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
837 | cmd_request->bounce_sgl_count); | |
838 | } | |
8dcf37d4 | 839 | |
42e22cac S |
840 | scmnd->result = vm_srb->scsi_status; |
841 | ||
2707388c S |
842 | if (scmnd->result) { |
843 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
844 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
845 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
846 | } | |
847 | ||
c50bd448 S |
848 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
849 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
850 | sense_hdr.ascq); | |
851 | ||
2707388c | 852 | scsi_set_resid(scmnd, |
61eaffc9 | 853 | cmd_request->data_buffer.len - |
2707388c S |
854 | vm_srb->data_transfer_length); |
855 | ||
856 | scsi_done_fn = scmnd->scsi_done; | |
857 | ||
858 | scmnd->host_scribble = NULL; | |
859 | scmnd->scsi_done = NULL; | |
860 | ||
861 | scsi_done_fn(scmnd); | |
862 | ||
863 | mempool_free(cmd_request, memp->request_mempool); | |
864 | } | |
865 | ||
866 | static void storvsc_on_io_completion(struct hv_device *device, | |
867 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 868 | struct storvsc_cmd_request *request) |
2707388c S |
869 | { |
870 | struct storvsc_device *stor_device; | |
871 | struct vstor_packet *stor_pkt; | |
872 | ||
873 | stor_device = hv_get_drvdata(device); | |
874 | stor_pkt = &request->vstor_packet; | |
875 | ||
876 | /* | |
877 | * The current SCSI handling on the host side does | |
878 | * not correctly handle: | |
879 | * INQUIRY command with page code parameter set to 0x80 | |
880 | * MODE_SENSE command with cmd[2] == 0x1c | |
881 | * | |
882 | * Setup srb and scsi status so this won't be fatal. | |
883 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
884 | * (srb status == 0x4) and off-line the device in that case. |
885 | */ | |
886 | ||
887 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 888 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 889 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 890 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
891 | } |
892 | ||
8dcf37d4 S |
893 | |
894 | /* Copy over the status...etc */ | |
895 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
896 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
897 | stor_pkt->vm_srb.sense_info_length = | |
898 | vstor_packet->vm_srb.sense_info_length; | |
899 | ||
900 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 901 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
902 | dev_warn(&device->device, |
903 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
904 | stor_pkt->vm_srb.cdb[0], | |
905 | vstor_packet->vm_srb.scsi_status, | |
906 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
907 | } |
908 | ||
909 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
910 | /* CHECK_CONDITION */ | |
16046320 S |
911 | if (vstor_packet->vm_srb.srb_status & |
912 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 913 | /* autosense data available */ |
d181daa0 | 914 | dev_warn(&device->device, |
41098f8f S |
915 | "stor pkt %p autosense data valid - len %d\n", |
916 | request, | |
917 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
918 | |
919 | memcpy(request->sense_buffer, | |
920 | vstor_packet->vm_srb.sense_data, | |
921 | vstor_packet->vm_srb.sense_info_length); | |
922 | ||
923 | } | |
924 | } | |
925 | ||
926 | stor_pkt->vm_srb.data_transfer_length = | |
927 | vstor_packet->vm_srb.data_transfer_length; | |
928 | ||
2707388c | 929 | storvsc_command_completion(request); |
8dcf37d4 S |
930 | |
931 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
932 | stor_device->drain_notify) | |
933 | wake_up(&stor_device->waiting_to_drain); | |
934 | ||
935 | ||
936 | } | |
937 | ||
938 | static void storvsc_on_receive(struct hv_device *device, | |
939 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 940 | struct storvsc_cmd_request *request) |
8dcf37d4 | 941 | { |
12675799 S |
942 | struct storvsc_scan_work *work; |
943 | struct storvsc_device *stor_device; | |
944 | ||
8dcf37d4 S |
945 | switch (vstor_packet->operation) { |
946 | case VSTOR_OPERATION_COMPLETE_IO: | |
947 | storvsc_on_io_completion(device, vstor_packet, request); | |
948 | break; | |
12675799 | 949 | |
8dcf37d4 | 950 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
951 | case VSTOR_OPERATION_ENUMERATE_BUS: |
952 | stor_device = get_in_stor_device(device); | |
953 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
954 | if (!work) | |
955 | return; | |
956 | ||
957 | INIT_WORK(&work->work, storvsc_bus_scan); | |
958 | work->host = stor_device->host; | |
959 | schedule_work(&work->work); | |
960 | break; | |
8dcf37d4 S |
961 | |
962 | default: | |
963 | break; | |
964 | } | |
965 | } | |
966 | ||
967 | static void storvsc_on_channel_callback(void *context) | |
968 | { | |
969 | struct hv_device *device = (struct hv_device *)context; | |
970 | struct storvsc_device *stor_device; | |
971 | u32 bytes_recvd; | |
972 | u64 request_id; | |
973 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 974 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
975 | int ret; |
976 | ||
977 | ||
978 | stor_device = get_in_stor_device(device); | |
979 | if (!stor_device) | |
980 | return; | |
981 | ||
982 | do { | |
983 | ret = vmbus_recvpacket(device->channel, packet, | |
984 | ALIGN(sizeof(struct vstor_packet), 8), | |
985 | &bytes_recvd, &request_id); | |
986 | if (ret == 0 && bytes_recvd > 0) { | |
987 | ||
61eaffc9 | 988 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
989 | (unsigned long)request_id; |
990 | ||
991 | if ((request == &stor_device->init_request) || | |
992 | (request == &stor_device->reset_request)) { | |
993 | ||
994 | memcpy(&request->vstor_packet, packet, | |
995 | sizeof(struct vstor_packet)); | |
996 | complete(&request->wait_event); | |
997 | } else { | |
998 | storvsc_on_receive(device, | |
999 | (struct vstor_packet *)packet, | |
1000 | request); | |
1001 | } | |
1002 | } else { | |
1003 | break; | |
1004 | } | |
1005 | } while (1); | |
1006 | ||
1007 | return; | |
1008 | } | |
1009 | ||
1010 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1011 | { | |
1012 | struct vmstorage_channel_properties props; | |
1013 | int ret; | |
1014 | ||
1015 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1016 | ||
8dcf37d4 S |
1017 | ret = vmbus_open(device->channel, |
1018 | ring_size, | |
1019 | ring_size, | |
1020 | (void *)&props, | |
1021 | sizeof(struct vmstorage_channel_properties), | |
1022 | storvsc_on_channel_callback, device); | |
1023 | ||
1024 | if (ret != 0) | |
1025 | return ret; | |
1026 | ||
1027 | ret = storvsc_channel_init(device); | |
1028 | ||
1029 | return ret; | |
1030 | } | |
1031 | ||
c1b3d067 | 1032 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1033 | { |
1034 | struct storvsc_device *stor_device; | |
1035 | unsigned long flags; | |
1036 | ||
cd654ea1 | 1037 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1038 | |
1039 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1040 | stor_device->destroy = true; | |
1041 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1042 | ||
1043 | /* | |
1044 | * At this point, all outbound traffic should be disable. We | |
1045 | * only allow inbound traffic (responses) to proceed so that | |
1046 | * outstanding requests can be completed. | |
1047 | */ | |
1048 | ||
1049 | storvsc_wait_to_drain(stor_device); | |
1050 | ||
1051 | /* | |
1052 | * Since we have already drained, we don't need to busy wait | |
1053 | * as was done in final_release_stor_device() | |
1054 | * Note that we cannot set the ext pointer to NULL until | |
1055 | * we have drained - to drain the outgoing packets, we need to | |
1056 | * allow incoming packets. | |
1057 | */ | |
1058 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1059 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1060 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1061 | ||
1062 | /* Close the channel */ | |
1063 | vmbus_close(device->channel); | |
1064 | ||
1065 | kfree(stor_device); | |
1066 | return 0; | |
1067 | } | |
1068 | ||
c1b3d067 | 1069 | static int storvsc_do_io(struct hv_device *device, |
61eaffc9 | 1070 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1071 | { |
1072 | struct storvsc_device *stor_device; | |
1073 | struct vstor_packet *vstor_packet; | |
1074 | int ret = 0; | |
1075 | ||
1076 | vstor_packet = &request->vstor_packet; | |
1077 | stor_device = get_out_stor_device(device); | |
1078 | ||
1079 | if (!stor_device) | |
1080 | return -ENODEV; | |
1081 | ||
1082 | ||
1083 | request->device = device; | |
1084 | ||
1085 | ||
1086 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1087 | ||
1088 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
1089 | ||
1090 | ||
6b2f9495 | 1091 | vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; |
8dcf37d4 S |
1092 | |
1093 | ||
1094 | vstor_packet->vm_srb.data_transfer_length = | |
1095 | request->data_buffer.len; | |
1096 | ||
1097 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1098 | ||
1099 | if (request->data_buffer.len) { | |
1100 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
1101 | &request->data_buffer, | |
1102 | vstor_packet, | |
1103 | sizeof(struct vstor_packet), | |
1104 | (unsigned long)request); | |
1105 | } else { | |
1106 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1107 | sizeof(struct vstor_packet), | |
1108 | (unsigned long)request, | |
1109 | VM_PKT_DATA_INBAND, | |
1110 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1111 | } | |
1112 | ||
1113 | if (ret != 0) | |
1114 | return ret; | |
1115 | ||
1116 | atomic_inc(&stor_device->num_outstanding_req); | |
1117 | ||
1118 | return ret; | |
1119 | } | |
1120 | ||
5b60acee S |
1121 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1122 | { | |
ce3e301c S |
1123 | struct stor_mem_pools *memp; |
1124 | int number = STORVSC_MIN_BUF_NR; | |
1125 | ||
1126 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1127 | if (!memp) | |
1128 | return -ENOMEM; | |
1129 | ||
1130 | memp->request_pool = | |
1131 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1132 | sizeof(struct storvsc_cmd_request), 0, | |
1133 | SLAB_HWCACHE_ALIGN, NULL); | |
1134 | ||
1135 | if (!memp->request_pool) | |
1136 | goto err0; | |
1137 | ||
1138 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1139 | mempool_free_slab, | |
1140 | memp->request_pool); | |
1141 | ||
1142 | if (!memp->request_mempool) | |
1143 | goto err1; | |
1144 | ||
1145 | sdevice->hostdata = memp; | |
1146 | ||
5b60acee | 1147 | return 0; |
ce3e301c S |
1148 | |
1149 | err1: | |
1150 | kmem_cache_destroy(memp->request_pool); | |
1151 | ||
1152 | err0: | |
1153 | kfree(memp); | |
1154 | return -ENOMEM; | |
1155 | } | |
1156 | ||
1157 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1158 | { | |
1159 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1160 | ||
1161 | mempool_destroy(memp->request_mempool); | |
1162 | kmem_cache_destroy(memp->request_pool); | |
1163 | kfree(memp); | |
1164 | sdevice->hostdata = NULL; | |
5b60acee S |
1165 | } |
1166 | ||
419f2d03 S |
1167 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1168 | { | |
1169 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1170 | STORVSC_MAX_IO_REQUESTS); | |
1171 | ||
419f2d03 S |
1172 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1173 | ||
419f2d03 | 1174 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1175 | |
3e8f4f40 OH |
1176 | sdevice->no_write_same = 1; |
1177 | ||
419f2d03 S |
1178 | return 0; |
1179 | } | |
1180 | ||
62838ce2 S |
1181 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1182 | sector_t capacity, int *info) | |
1183 | { | |
5326fd5c S |
1184 | sector_t nsect = capacity; |
1185 | sector_t cylinders = nsect; | |
1186 | int heads, sectors_pt; | |
62838ce2 | 1187 | |
5326fd5c S |
1188 | /* |
1189 | * We are making up these values; let us keep it simple. | |
1190 | */ | |
1191 | heads = 0xff; | |
1192 | sectors_pt = 0x3f; /* Sectors per track */ | |
1193 | sector_div(cylinders, heads * sectors_pt); | |
1194 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1195 | cylinders = 0xffff; | |
62838ce2 S |
1196 | |
1197 | info[0] = heads; | |
5326fd5c S |
1198 | info[1] = sectors_pt; |
1199 | info[2] = (int)cylinders; | |
62838ce2 | 1200 | |
62838ce2 S |
1201 | return 0; |
1202 | } | |
aa3d789e | 1203 | |
4b270c8b | 1204 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1205 | { |
4b270c8b S |
1206 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1207 | struct hv_device *device = host_dev->dev; | |
1208 | ||
aa3d789e | 1209 | struct storvsc_device *stor_device; |
61eaffc9 | 1210 | struct storvsc_cmd_request *request; |
aa3d789e S |
1211 | struct vstor_packet *vstor_packet; |
1212 | int ret, t; | |
1213 | ||
aa3d789e | 1214 | |
1eaaddf9 | 1215 | stor_device = get_out_stor_device(device); |
aa3d789e | 1216 | if (!stor_device) |
a00e8224 | 1217 | return FAILED; |
aa3d789e S |
1218 | |
1219 | request = &stor_device->reset_request; | |
1220 | vstor_packet = &request->vstor_packet; | |
1221 | ||
1222 | init_completion(&request->wait_event); | |
1223 | ||
1224 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1225 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1226 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1227 | ||
1228 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1229 | sizeof(struct vstor_packet), | |
1230 | (unsigned long)&stor_device->reset_request, | |
1231 | VM_PKT_DATA_INBAND, | |
1232 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1233 | if (ret != 0) | |
a00e8224 | 1234 | return FAILED; |
aa3d789e | 1235 | |
46d2eb6d | 1236 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1237 | if (t == 0) |
1238 | return TIMEOUT_ERROR; | |
aa3d789e | 1239 | |
aa3d789e S |
1240 | |
1241 | /* | |
1242 | * At this point, all outstanding requests in the adapter | |
1243 | * should have been flushed out and return to us | |
5c1b10ab S |
1244 | * There is a potential race here where the host may be in |
1245 | * the process of responding when we return from here. | |
1246 | * Just wait for all in-transit packets to be accounted for | |
1247 | * before we return from here. | |
aa3d789e | 1248 | */ |
5c1b10ab | 1249 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1250 | |
a00e8224 | 1251 | return SUCCESS; |
aa3d789e S |
1252 | } |
1253 | ||
c77b63b6 | 1254 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1255 | { |
1256 | bool allowed = true; | |
1257 | u8 scsi_op = scmnd->cmnd[0]; | |
1258 | ||
1259 | switch (scsi_op) { | |
3e8f4f40 OH |
1260 | /* the host does not handle WRITE_SAME, log accident usage */ |
1261 | case WRITE_SAME: | |
c77b63b6 S |
1262 | /* |
1263 | * smartd sends this command and the host does not handle | |
1264 | * this. So, don't send it. | |
1265 | */ | |
41098f8f | 1266 | case SET_WINDOW: |
59e00e74 | 1267 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1268 | allowed = false; |
1269 | break; | |
1270 | default: | |
1271 | break; | |
92ae4ebd OH |
1272 | } |
1273 | return allowed; | |
1274 | } | |
c5b463ae | 1275 | |
bab445e1 | 1276 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1277 | { |
1278 | int ret; | |
bab445e1 | 1279 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1280 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1281 | struct storvsc_cmd_request *cmd_request; |
1282 | unsigned int request_size = 0; | |
1283 | int i; | |
1284 | struct scatterlist *sgl; | |
1285 | unsigned int sg_count = 0; | |
1286 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1287 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1288 | |
c77b63b6 | 1289 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1290 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1291 | return 0; |
1292 | } | |
c5b463ae | 1293 | |
c5b463ae S |
1294 | request_size = sizeof(struct storvsc_cmd_request); |
1295 | ||
ce3e301c | 1296 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1297 | GFP_ATOMIC); |
c77b63b6 S |
1298 | |
1299 | /* | |
1300 | * We might be invoked in an interrupt context; hence | |
1301 | * mempool_alloc() can fail. | |
1302 | */ | |
bab445e1 | 1303 | if (!cmd_request) |
c5b463ae | 1304 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1305 | |
4e03e697 | 1306 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1307 | |
1308 | /* Setup the cmd request */ | |
c5b463ae S |
1309 | cmd_request->cmd = scmnd; |
1310 | ||
1311 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1312 | ||
61eaffc9 | 1313 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
c5b463ae S |
1314 | |
1315 | ||
1316 | /* Build the SRB */ | |
1317 | switch (scmnd->sc_data_direction) { | |
1318 | case DMA_TO_DEVICE: | |
1319 | vm_srb->data_in = WRITE_TYPE; | |
1320 | break; | |
1321 | case DMA_FROM_DEVICE: | |
1322 | vm_srb->data_in = READ_TYPE; | |
1323 | break; | |
1324 | default: | |
1325 | vm_srb->data_in = UNKNOWN_TYPE; | |
1326 | break; | |
1327 | } | |
1328 | ||
c5b463ae | 1329 | |
c5b463ae S |
1330 | vm_srb->port_number = host_dev->port; |
1331 | vm_srb->path_id = scmnd->device->channel; | |
1332 | vm_srb->target_id = scmnd->device->id; | |
1333 | vm_srb->lun = scmnd->device->lun; | |
1334 | ||
c5b463ae S |
1335 | vm_srb->cdb_length = scmnd->cmd_len; |
1336 | ||
1337 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1338 | ||
61eaffc9 | 1339 | cmd_request->sense_buffer = scmnd->sense_buffer; |
c5b463ae S |
1340 | |
1341 | ||
61eaffc9 | 1342 | cmd_request->data_buffer.len = scsi_bufflen(scmnd); |
c5b463ae S |
1343 | if (scsi_sg_count(scmnd)) { |
1344 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1345 | sg_count = scsi_sg_count(scmnd); | |
1346 | ||
1347 | /* check if we need to bounce the sgl */ | |
1348 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1349 | cmd_request->bounce_sgl = | |
1350 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1351 | scsi_bufflen(scmnd), |
1352 | vm_srb->data_in); | |
c5b463ae | 1353 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1354 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1355 | goto queue_error; | |
c5b463ae S |
1356 | } |
1357 | ||
1358 | cmd_request->bounce_sgl_count = | |
1359 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1360 | PAGE_SHIFT; | |
1361 | ||
fa23b8c7 S |
1362 | if (vm_srb->data_in == WRITE_TYPE) |
1363 | copy_to_bounce_buffer(sgl, | |
1364 | cmd_request->bounce_sgl, | |
1365 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1366 | |
1367 | sgl = cmd_request->bounce_sgl; | |
1368 | sg_count = cmd_request->bounce_sgl_count; | |
1369 | } | |
1370 | ||
61eaffc9 | 1371 | cmd_request->data_buffer.offset = sgl[0].offset; |
c5b463ae S |
1372 | |
1373 | for (i = 0; i < sg_count; i++) | |
61eaffc9 | 1374 | cmd_request->data_buffer.pfn_array[i] = |
c5b463ae S |
1375 | page_to_pfn(sg_page((&sgl[i]))); |
1376 | ||
1377 | } else if (scsi_sglist(scmnd)) { | |
61eaffc9 | 1378 | cmd_request->data_buffer.offset = |
c5b463ae | 1379 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
61eaffc9 | 1380 | cmd_request->data_buffer.pfn_array[0] = |
c5b463ae S |
1381 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1382 | } | |
1383 | ||
c5b463ae | 1384 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1385 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1386 | |
d2598f01 | 1387 | if (ret == -EAGAIN) { |
c5b463ae S |
1388 | /* no more space */ |
1389 | ||
c77b63b6 | 1390 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1391 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1392 | cmd_request->bounce_sgl_count); |
c5b463ae | 1393 | |
c77b63b6 S |
1394 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1395 | goto queue_error; | |
1396 | } | |
c5b463ae S |
1397 | } |
1398 | ||
c77b63b6 S |
1399 | return 0; |
1400 | ||
1401 | queue_error: | |
1402 | mempool_free(cmd_request, memp->request_mempool); | |
1403 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1404 | return ret; |
1405 | } | |
1406 | ||
bef4a34a | 1407 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1408 | .module = THIS_MODULE, |
1409 | .name = "storvsc_host_t", | |
1410 | .bios_param = storvsc_get_chs, | |
1411 | .queuecommand = storvsc_queuecommand, | |
1412 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1413 | .slave_alloc = storvsc_device_alloc, | |
ce3e301c | 1414 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1415 | .slave_configure = storvsc_device_configure, |
1416 | .cmd_per_lun = 1, | |
1417 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1418 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1419 | .this_id = -1, |
454f18a9 | 1420 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1421 | /* currently 32 */ |
1422 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1423 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1424 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1425 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1426 | }; |
1427 | ||
ef52a81b S |
1428 | enum { |
1429 | SCSI_GUID, | |
1430 | IDE_GUID, | |
1431 | }; | |
1432 | ||
d847b5fe | 1433 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1434 | /* SCSI guid */ |
1435 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1436 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1437 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1438 | /* IDE guid */ |
1439 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1440 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1441 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1442 | { }, |
d847b5fe | 1443 | }; |
bef4a34a | 1444 | |
d847b5fe | 1445 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1446 | |
84946899 S |
1447 | static int storvsc_probe(struct hv_device *device, |
1448 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1449 | { |
ff568d3a | 1450 | int ret; |
bef4a34a | 1451 | struct Scsi_Host *host; |
795b613d | 1452 | struct hv_host_device *host_dev; |
ef52a81b | 1453 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1454 | int target = 0; |
6e4198ce | 1455 | struct storvsc_device *stor_device; |
bd1f5d6a | 1456 | |
ff568d3a | 1457 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1458 | sizeof(struct hv_host_device)); |
f8feed06 | 1459 | if (!host) |
bef4a34a | 1460 | return -ENOMEM; |
bef4a34a | 1461 | |
7f33f30a | 1462 | host_dev = shost_priv(host); |
795b613d | 1463 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1464 | |
795b613d | 1465 | host_dev->port = host->host_no; |
97c15296 | 1466 | host_dev->dev = device; |
bef4a34a | 1467 | |
4e03e697 | 1468 | |
a13d35ab | 1469 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1470 | if (!stor_device) { |
225ce6ea | 1471 | ret = -ENOMEM; |
ce3e301c | 1472 | goto err_out0; |
6e4198ce | 1473 | } |
9efd21e1 | 1474 | |
a13d35ab S |
1475 | stor_device->destroy = false; |
1476 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1477 | stor_device->device = device; | |
cd654ea1 S |
1478 | stor_device->host = host; |
1479 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1480 | |
6e4198ce S |
1481 | stor_device->port_number = host->host_no; |
1482 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1483 | if (ret) |
ce3e301c | 1484 | goto err_out1; |
bef4a34a | 1485 | |
6e4198ce S |
1486 | host_dev->path = stor_device->path_id; |
1487 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1488 | |
ff568d3a GKH |
1489 | /* max # of devices per target */ |
1490 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1491 | /* max # of targets per channel */ | |
1492 | host->max_id = STORVSC_MAX_TARGETS; | |
1493 | /* max # of channels */ | |
1494 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1495 | /* max cmd length */ |
1496 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1497 | |
454f18a9 | 1498 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1499 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1500 | if (ret != 0) |
ce3e301c | 1501 | goto err_out2; |
bef4a34a | 1502 | |
bd1f5d6a S |
1503 | if (!dev_is_ide) { |
1504 | scsi_scan_host(host); | |
59d22950 S |
1505 | } else { |
1506 | target = (device->dev_instance.b[5] << 8 | | |
1507 | device->dev_instance.b[4]); | |
1508 | ret = scsi_add_device(host, 0, target, 0); | |
1509 | if (ret) { | |
1510 | scsi_remove_host(host); | |
1511 | goto err_out2; | |
1512 | } | |
bef4a34a | 1513 | } |
bd1f5d6a | 1514 | return 0; |
bef4a34a | 1515 | |
ce3e301c | 1516 | err_out2: |
225ce6ea S |
1517 | /* |
1518 | * Once we have connected with the host, we would need to | |
1519 | * to invoke storvsc_dev_remove() to rollback this state and | |
1520 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1521 | * err_out1 label. |
225ce6ea | 1522 | */ |
bd1f5d6a | 1523 | storvsc_dev_remove(device); |
ce3e301c | 1524 | goto err_out0; |
225ce6ea S |
1525 | |
1526 | err_out1: | |
ce3e301c | 1527 | kfree(stor_device); |
225ce6ea S |
1528 | |
1529 | err_out0: | |
bd1f5d6a | 1530 | scsi_host_put(host); |
225ce6ea | 1531 | return ret; |
bef4a34a HJ |
1532 | } |
1533 | ||
ddcbf65e S |
1534 | static int storvsc_remove(struct hv_device *dev) |
1535 | { | |
1536 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1537 | struct Scsi_Host *host = stor_device->host; | |
1538 | ||
1539 | scsi_remove_host(host); | |
1540 | storvsc_dev_remove(dev); | |
1541 | scsi_host_put(host); | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
40bf63ed | 1546 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1547 | .name = KBUILD_MODNAME, |
d847b5fe | 1548 | .id_table = id_table, |
40bf63ed S |
1549 | .probe = storvsc_probe, |
1550 | .remove = storvsc_remove, | |
39ae6fae | 1551 | }; |
7bd05b91 | 1552 | |
d9bbae83 | 1553 | static int __init storvsc_drv_init(void) |
f5c78872 | 1554 | { |
01415ab3 S |
1555 | u32 max_outstanding_req_per_channel; |
1556 | ||
1557 | /* | |
1558 | * Divide the ring buffer data size (which is 1 page less | |
1559 | * than the ring buffer size since that page is reserved for | |
1560 | * the ring buffer indices) by the max request size (which is | |
1561 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1562 | */ | |
01415ab3 | 1563 | max_outstanding_req_per_channel = |
768fa219 GKH |
1564 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1565 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1566 | sizeof(struct vstor_packet) + sizeof(u64), | |
1567 | sizeof(u64))); | |
f5c78872 | 1568 | |
01415ab3 | 1569 | if (max_outstanding_req_per_channel < |
f5c78872 | 1570 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1571 | return -EINVAL; |
f5c78872 | 1572 | |
768fa219 | 1573 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1574 | } |
1575 | ||
c63ba9e1 | 1576 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1577 | { |
768fa219 | 1578 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1579 | } |
1580 | ||
ff568d3a | 1581 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1582 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1583 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1584 | module_init(storvsc_drv_init); |
c63ba9e1 | 1585 | module_exit(storvsc_drv_exit); |