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> |
7afc3ac1 | 36 | #include <linux/blkdev.h> |
bef4a34a HJ |
37 | #include <scsi/scsi.h> |
38 | #include <scsi/scsi_cmnd.h> | |
39 | #include <scsi/scsi_host.h> | |
40 | #include <scsi/scsi_device.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <scsi/scsi_eh.h> | |
43 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 44 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 45 | |
09f0355f | 46 | /* |
af9584b8 S |
47 | * All wire protocol details (storage protocol between the guest and the host) |
48 | * are consolidated here. | |
49 | * | |
50 | * Begin protocol definitions. | |
09f0355f S |
51 | */ |
52 | ||
09f0355f S |
53 | /* |
54 | * Version history: | |
55 | * V1 Beta: 0.1 | |
56 | * V1 RC < 2008/1/31: 1.0 | |
57 | * V1 RC > 2008/1/31: 2.0 | |
58 | * Win7: 4.2 | |
59 | */ | |
60 | ||
85904a5e S |
61 | #define VMSTOR_CURRENT_MAJOR 4 |
62 | #define VMSTOR_CURRENT_MINOR 2 | |
f0d79fe9 S |
63 | |
64 | ||
f0d79fe9 S |
65 | /* Packet structure describing virtual storage requests. */ |
66 | enum vstor_packet_operation { | |
67 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
68 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
69 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
70 | VSTOR_OPERATION_RESET_LUN = 4, | |
71 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
72 | VSTOR_OPERATION_RESET_BUS = 6, | |
73 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
74 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
75 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
76 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
77 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
78 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
79 | }; |
80 | ||
81 | /* | |
82 | * Platform neutral description of a scsi request - | |
83 | * this remains the same across the write regardless of 32/64 bit | |
84 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
85 | */ | |
6b2f9495 S |
86 | #define STORVSC_MAX_CMD_LEN 0x10 |
87 | #define STORVSC_SENSE_BUFFER_SIZE 0x12 | |
88 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 | |
f0d79fe9 S |
89 | |
90 | struct vmscsi_request { | |
c649114a S |
91 | u16 length; |
92 | u8 srb_status; | |
93 | u8 scsi_status; | |
f0d79fe9 | 94 | |
c649114a S |
95 | u8 port_number; |
96 | u8 path_id; | |
97 | u8 target_id; | |
98 | u8 lun; | |
f0d79fe9 | 99 | |
c649114a S |
100 | u8 cdb_length; |
101 | u8 sense_info_length; | |
102 | u8 data_in; | |
103 | u8 reserved; | |
f0d79fe9 | 104 | |
c649114a | 105 | u32 data_transfer_length; |
f0d79fe9 S |
106 | |
107 | union { | |
6b2f9495 S |
108 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
109 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
110 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 S |
111 | }; |
112 | } __attribute((packed)); | |
113 | ||
114 | ||
115 | /* | |
116 | * This structure is sent during the intialization phase to get the different | |
117 | * properties of the channel. | |
118 | */ | |
119 | struct vmstorage_channel_properties { | |
c649114a S |
120 | u16 protocol_version; |
121 | u8 path_id; | |
122 | u8 target_id; | |
f0d79fe9 S |
123 | |
124 | /* Note: port number is only really known on the client side */ | |
c649114a S |
125 | u32 port_number; |
126 | u32 flags; | |
127 | u32 max_transfer_bytes; | |
f0d79fe9 | 128 | |
c649114a S |
129 | /* |
130 | * This id is unique for each channel and will correspond with | |
131 | * vendor specific data in the inquiry data. | |
132 | */ | |
133 | ||
134 | u64 unique_id; | |
f0d79fe9 S |
135 | } __packed; |
136 | ||
137 | /* This structure is sent during the storage protocol negotiations. */ | |
138 | struct vmstorage_protocol_version { | |
139 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 140 | u16 major_minor; |
f0d79fe9 S |
141 | |
142 | /* | |
143 | * Revision number is auto-incremented whenever this file is changed | |
144 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
145 | * definitely indicate incompatibility--but it does indicate mismatched | |
146 | * builds. | |
c649114a | 147 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 148 | */ |
85904a5e | 149 | u16 revision; |
f0d79fe9 S |
150 | } __packed; |
151 | ||
152 | /* Channel Property Flags */ | |
153 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
154 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
155 | ||
156 | struct vstor_packet { | |
157 | /* Requested operation type */ | |
158 | enum vstor_packet_operation operation; | |
159 | ||
160 | /* Flags - see below for values */ | |
c649114a | 161 | u32 flags; |
f0d79fe9 S |
162 | |
163 | /* Status of the request returned from the server side. */ | |
c649114a | 164 | u32 status; |
f0d79fe9 S |
165 | |
166 | /* Data payload area */ | |
167 | union { | |
168 | /* | |
169 | * Structure used to forward SCSI commands from the | |
170 | * client to the server. | |
171 | */ | |
172 | struct vmscsi_request vm_srb; | |
173 | ||
174 | /* Structure used to query channel properties. */ | |
175 | struct vmstorage_channel_properties storage_channel_properties; | |
176 | ||
177 | /* Used during version negotiations. */ | |
178 | struct vmstorage_protocol_version version; | |
179 | }; | |
180 | } __packed; | |
181 | ||
f0d79fe9 | 182 | /* |
09f0355f S |
183 | * Packet Flags: |
184 | * | |
f0d79fe9 S |
185 | * This flag indicates that the server should send back a completion for this |
186 | * packet. | |
187 | */ | |
09f0355f | 188 | |
f0d79fe9 S |
189 | #define REQUEST_COMPLETION_FLAG 0x1 |
190 | ||
f0d79fe9 S |
191 | /* Matches Windows-end */ |
192 | enum storvsc_request_type { | |
c649114a | 193 | WRITE_TYPE = 0, |
f0d79fe9 S |
194 | READ_TYPE, |
195 | UNKNOWN_TYPE, | |
196 | }; | |
197 | ||
16046320 S |
198 | /* |
199 | * SRB status codes and masks; a subset of the codes used here. | |
200 | */ | |
201 | ||
202 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
203 | #define SRB_STATUS_INVALID_LUN 0x20 | |
204 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 205 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
206 | #define SRB_STATUS_ERROR 0x04 |
207 | ||
af9584b8 S |
208 | /* |
209 | * This is the end of Protocol specific defines. | |
210 | */ | |
211 | ||
212 | ||
213 | /* | |
214 | * We setup a mempool to allocate request structures for this driver | |
215 | * on a per-lun basis. The following define specifies the number of | |
216 | * elements in the pool. | |
217 | */ | |
218 | ||
219 | #define STORVSC_MIN_BUF_NR 64 | |
220 | static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); | |
221 | ||
222 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
223 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
224 | ||
225 | #define STORVSC_MAX_IO_REQUESTS 128 | |
226 | ||
227 | /* | |
228 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
229 | * reality, the path/target is not used (ie always set to 0) so our | |
230 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
231 | * up to 256 luns. | |
232 | */ | |
233 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
234 | #define STORVSC_MAX_TARGETS 1 | |
235 | #define STORVSC_MAX_CHANNELS 1 | |
236 | ||
237 | ||
16046320 | 238 | |
61eaffc9 S |
239 | struct storvsc_cmd_request { |
240 | struct list_head entry; | |
241 | struct scsi_cmnd *cmd; | |
242 | ||
243 | unsigned int bounce_sgl_count; | |
244 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 245 | |
f0d79fe9 S |
246 | struct hv_device *device; |
247 | ||
248 | /* Synchronize the request/response if needed */ | |
249 | struct completion wait_event; | |
250 | ||
251 | unsigned char *sense_buffer; | |
f0d79fe9 | 252 | struct hv_multipage_buffer data_buffer; |
f0d79fe9 S |
253 | struct vstor_packet vstor_packet; |
254 | }; | |
255 | ||
256 | ||
f0d79fe9 S |
257 | /* A storvsc device is a device object that contains a vmbus channel */ |
258 | struct storvsc_device { | |
259 | struct hv_device *device; | |
260 | ||
261 | bool destroy; | |
262 | bool drain_notify; | |
263 | atomic_t num_outstanding_req; | |
cd654ea1 | 264 | struct Scsi_Host *host; |
f0d79fe9 S |
265 | |
266 | wait_queue_head_t waiting_to_drain; | |
267 | ||
268 | /* | |
269 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
270 | * controller. In reality, the pathid, targetid is always 0 | |
271 | * and the port is set by us | |
272 | */ | |
273 | unsigned int port_number; | |
274 | unsigned char path_id; | |
275 | unsigned char target_id; | |
276 | ||
277 | /* Used for vsc/vsp channel reset process */ | |
61eaffc9 S |
278 | struct storvsc_cmd_request init_request; |
279 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
280 | }; |
281 | ||
ce3e301c | 282 | struct stor_mem_pools { |
c1b3d067 | 283 | struct kmem_cache *request_pool; |
4e03e697 | 284 | mempool_t *request_mempool; |
ce3e301c S |
285 | }; |
286 | ||
287 | struct hv_host_device { | |
288 | struct hv_device *dev; | |
c1b3d067 S |
289 | unsigned int port; |
290 | unsigned char path; | |
291 | unsigned char target; | |
292 | }; | |
293 | ||
12675799 S |
294 | struct storvsc_scan_work { |
295 | struct work_struct work; | |
296 | struct Scsi_Host *host; | |
297 | uint lun; | |
298 | }; | |
299 | ||
6781209e S |
300 | static void storvsc_device_scan(struct work_struct *work) |
301 | { | |
302 | struct storvsc_scan_work *wrk; | |
303 | uint lun; | |
304 | struct scsi_device *sdev; | |
305 | ||
306 | wrk = container_of(work, struct storvsc_scan_work, work); | |
307 | lun = wrk->lun; | |
308 | ||
309 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
310 | if (!sdev) | |
311 | goto done; | |
312 | scsi_rescan_device(&sdev->sdev_gendev); | |
313 | scsi_device_put(sdev); | |
314 | ||
315 | done: | |
316 | kfree(wrk); | |
317 | } | |
318 | ||
12675799 S |
319 | static void storvsc_bus_scan(struct work_struct *work) |
320 | { | |
321 | struct storvsc_scan_work *wrk; | |
322 | int id, order_id; | |
323 | ||
324 | wrk = container_of(work, struct storvsc_scan_work, work); | |
325 | for (id = 0; id < wrk->host->max_id; ++id) { | |
326 | if (wrk->host->reverse_ordering) | |
327 | order_id = wrk->host->max_id - id - 1; | |
328 | else | |
329 | order_id = id; | |
330 | ||
331 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
332 | order_id, SCAN_WILD_CARD, 1); | |
333 | } | |
334 | kfree(wrk); | |
335 | } | |
336 | ||
b4017319 S |
337 | static void storvsc_remove_lun(struct work_struct *work) |
338 | { | |
339 | struct storvsc_scan_work *wrk; | |
340 | struct scsi_device *sdev; | |
341 | ||
342 | wrk = container_of(work, struct storvsc_scan_work, work); | |
343 | if (!scsi_host_get(wrk->host)) | |
344 | goto done; | |
345 | ||
346 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
347 | ||
348 | if (sdev) { | |
349 | scsi_remove_device(sdev); | |
350 | scsi_device_put(sdev); | |
351 | } | |
352 | scsi_host_put(wrk->host); | |
353 | ||
354 | done: | |
355 | kfree(wrk); | |
356 | } | |
357 | ||
af9584b8 S |
358 | /* |
359 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
360 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
361 | */ | |
362 | ||
363 | static inline u16 storvsc_get_version(u8 major, u8 minor) | |
364 | { | |
365 | u16 version; | |
366 | ||
367 | version = ((major << 8) | minor); | |
368 | return version; | |
369 | } | |
370 | ||
a8c18c57 S |
371 | /* |
372 | * We can get incoming messages from the host that are not in response to | |
373 | * messages that we have sent out. An example of this would be messages | |
374 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
375 | * deal with potential race conditions where the driver may be in the | |
376 | * midst of being unloaded when we might receive an unsolicited message | |
377 | * from the host, we have implemented a mechanism to gurantee sequential | |
378 | * consistency: | |
379 | * | |
380 | * 1) Once the device is marked as being destroyed, we will fail all | |
381 | * outgoing messages. | |
382 | * 2) We permit incoming messages when the device is being destroyed, | |
383 | * only to properly account for messages already sent out. | |
384 | */ | |
385 | ||
f0d79fe9 S |
386 | static inline struct storvsc_device *get_out_stor_device( |
387 | struct hv_device *device) | |
388 | { | |
389 | struct storvsc_device *stor_device; | |
390 | ||
cd654ea1 | 391 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
392 | |
393 | if (stor_device && stor_device->destroy) | |
394 | stor_device = NULL; | |
395 | ||
396 | return stor_device; | |
397 | } | |
398 | ||
399 | ||
400 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
401 | { | |
402 | dev->drain_notify = true; | |
403 | wait_event(dev->waiting_to_drain, | |
404 | atomic_read(&dev->num_outstanding_req) == 0); | |
405 | dev->drain_notify = false; | |
406 | } | |
bef4a34a | 407 | |
8dcf37d4 S |
408 | static inline struct storvsc_device *get_in_stor_device( |
409 | struct hv_device *device) | |
410 | { | |
411 | struct storvsc_device *stor_device; | |
8dcf37d4 | 412 | |
cd654ea1 | 413 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
414 | |
415 | if (!stor_device) | |
416 | goto get_in_err; | |
417 | ||
418 | /* | |
419 | * If the device is being destroyed; allow incoming | |
420 | * traffic only to cleanup outstanding requests. | |
421 | */ | |
422 | ||
423 | if (stor_device->destroy && | |
424 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
425 | stor_device = NULL; | |
426 | ||
427 | get_in_err: | |
8dcf37d4 S |
428 | return stor_device; |
429 | ||
430 | } | |
431 | ||
2707388c S |
432 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
433 | unsigned int sg_count) | |
434 | { | |
435 | int i; | |
436 | struct page *page_buf; | |
437 | ||
438 | for (i = 0; i < sg_count; i++) { | |
439 | page_buf = sg_page((&sgl[i])); | |
440 | if (page_buf != NULL) | |
441 | __free_page(page_buf); | |
442 | } | |
443 | ||
444 | kfree(sgl); | |
445 | } | |
446 | ||
447 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
448 | { | |
449 | int i; | |
450 | ||
451 | /* No need to check */ | |
452 | if (sg_count < 2) | |
453 | return -1; | |
454 | ||
455 | /* We have at least 2 sg entries */ | |
456 | for (i = 0; i < sg_count; i++) { | |
457 | if (i == 0) { | |
458 | /* make sure 1st one does not have hole */ | |
459 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
460 | return i; | |
461 | } else if (i == sg_count - 1) { | |
462 | /* make sure last one does not have hole */ | |
463 | if (sgl[i].offset != 0) | |
464 | return i; | |
465 | } else { | |
466 | /* make sure no hole in the middle */ | |
467 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
468 | return i; | |
469 | } | |
470 | } | |
471 | return -1; | |
472 | } | |
473 | ||
474 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
475 | unsigned int sg_count, | |
476 | unsigned int len, | |
477 | int write) | |
478 | { | |
479 | int i; | |
480 | int num_pages; | |
481 | struct scatterlist *bounce_sgl; | |
482 | struct page *page_buf; | |
483 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
484 | ||
485 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
486 | ||
487 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
488 | if (!bounce_sgl) | |
489 | return NULL; | |
490 | ||
9d2696e6 | 491 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
492 | for (i = 0; i < num_pages; i++) { |
493 | page_buf = alloc_page(GFP_ATOMIC); | |
494 | if (!page_buf) | |
495 | goto cleanup; | |
496 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
497 | } | |
498 | ||
499 | return bounce_sgl; | |
500 | ||
501 | cleanup: | |
502 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
503 | return NULL; | |
504 | } | |
505 | ||
9f393834 LT |
506 | /* Disgusting wrapper functions */ |
507 | static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) | |
508 | { | |
509 | void *addr = kmap_atomic(sg_page(sgl + idx)); | |
510 | return (unsigned long)addr; | |
511 | } | |
8dcf37d4 | 512 | |
9f393834 LT |
513 | static inline void sg_kunmap_atomic(unsigned long addr) |
514 | { | |
515 | kunmap_atomic((void *)addr); | |
516 | } | |
8dcf37d4 | 517 | |
8dcf37d4 | 518 | |
2707388c S |
519 | /* Assume the original sgl has enough room */ |
520 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
521 | struct scatterlist *bounce_sgl, | |
522 | unsigned int orig_sgl_count, | |
523 | unsigned int bounce_sgl_count) | |
524 | { | |
525 | int i; | |
526 | int j = 0; | |
527 | unsigned long src, dest; | |
528 | unsigned int srclen, destlen, copylen; | |
529 | unsigned int total_copied = 0; | |
530 | unsigned long bounce_addr = 0; | |
531 | unsigned long dest_addr = 0; | |
532 | unsigned long flags; | |
533 | ||
534 | local_irq_save(flags); | |
535 | ||
536 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 537 | dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
538 | dest = dest_addr; |
539 | destlen = orig_sgl[i].length; | |
540 | ||
541 | if (bounce_addr == 0) | |
9f393834 | 542 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
543 | |
544 | while (destlen) { | |
545 | src = bounce_addr + bounce_sgl[j].offset; | |
546 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
547 | ||
548 | copylen = min(srclen, destlen); | |
549 | memcpy((void *)dest, (void *)src, copylen); | |
550 | ||
551 | total_copied += copylen; | |
552 | bounce_sgl[j].offset += copylen; | |
553 | destlen -= copylen; | |
554 | dest += copylen; | |
555 | ||
556 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
557 | /* full */ | |
9f393834 | 558 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
559 | j++; |
560 | ||
561 | /* | |
562 | * It is possible that the number of elements | |
563 | * in the bounce buffer may not be equal to | |
564 | * the number of elements in the original | |
565 | * scatter list. Handle this correctly. | |
566 | */ | |
567 | ||
568 | if (j == bounce_sgl_count) { | |
569 | /* | |
570 | * We are done; cleanup and return. | |
571 | */ | |
9f393834 | 572 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
573 | local_irq_restore(flags); |
574 | return total_copied; | |
575 | } | |
576 | ||
577 | /* if we need to use another bounce buffer */ | |
578 | if (destlen || i != orig_sgl_count - 1) | |
9f393834 | 579 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
580 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
581 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 582 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
583 | } |
584 | } | |
585 | ||
9f393834 | 586 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
587 | } |
588 | ||
589 | local_irq_restore(flags); | |
590 | ||
591 | return total_copied; | |
592 | } | |
593 | ||
594 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
595 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
596 | struct scatterlist *bounce_sgl, | |
597 | unsigned int orig_sgl_count) | |
598 | { | |
599 | int i; | |
600 | int j = 0; | |
601 | unsigned long src, dest; | |
602 | unsigned int srclen, destlen, copylen; | |
603 | unsigned int total_copied = 0; | |
604 | unsigned long bounce_addr = 0; | |
605 | unsigned long src_addr = 0; | |
606 | unsigned long flags; | |
607 | ||
608 | local_irq_save(flags); | |
609 | ||
610 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 611 | src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
612 | src = src_addr; |
613 | srclen = orig_sgl[i].length; | |
614 | ||
615 | if (bounce_addr == 0) | |
9f393834 | 616 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
617 | |
618 | while (srclen) { | |
619 | /* assume bounce offset always == 0 */ | |
620 | dest = bounce_addr + bounce_sgl[j].length; | |
621 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
622 | ||
623 | copylen = min(srclen, destlen); | |
624 | memcpy((void *)dest, (void *)src, copylen); | |
625 | ||
626 | total_copied += copylen; | |
627 | bounce_sgl[j].length += copylen; | |
628 | srclen -= copylen; | |
629 | src += copylen; | |
630 | ||
631 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
632 | /* full..move to next entry */ | |
9f393834 | 633 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
634 | j++; |
635 | ||
636 | /* if we need to use another bounce buffer */ | |
637 | if (srclen || i != orig_sgl_count - 1) | |
9f393834 | 638 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
639 | |
640 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
641 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 642 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
643 | } |
644 | } | |
645 | ||
9f393834 | 646 | sg_kunmap_atomic(src_addr - orig_sgl[i].offset); |
2707388c S |
647 | } |
648 | ||
649 | local_irq_restore(flags); | |
650 | ||
651 | return total_copied; | |
652 | } | |
653 | ||
8dcf37d4 S |
654 | static int storvsc_channel_init(struct hv_device *device) |
655 | { | |
656 | struct storvsc_device *stor_device; | |
61eaffc9 | 657 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
658 | struct vstor_packet *vstor_packet; |
659 | int ret, t; | |
660 | ||
661 | stor_device = get_out_stor_device(device); | |
662 | if (!stor_device) | |
663 | return -ENODEV; | |
664 | ||
665 | request = &stor_device->init_request; | |
666 | vstor_packet = &request->vstor_packet; | |
667 | ||
668 | /* | |
669 | * Now, initiate the vsc/vsp initialization protocol on the open | |
670 | * channel | |
671 | */ | |
61eaffc9 | 672 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
673 | init_completion(&request->wait_event); |
674 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
675 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
676 | ||
677 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
678 | sizeof(struct vstor_packet), | |
679 | (unsigned long)request, | |
680 | VM_PKT_DATA_INBAND, | |
681 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
682 | if (ret != 0) | |
683 | goto cleanup; | |
684 | ||
685 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
686 | if (t == 0) { | |
687 | ret = -ETIMEDOUT; | |
688 | goto cleanup; | |
689 | } | |
690 | ||
691 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
692 | vstor_packet->status != 0) | |
693 | goto cleanup; | |
694 | ||
695 | ||
696 | /* reuse the packet for version range supported */ | |
697 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
698 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
699 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
700 | ||
85904a5e S |
701 | vstor_packet->version.major_minor = |
702 | storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR); | |
703 | ||
704 | /* | |
705 | * The revision number is only used in Windows; set it to 0. | |
706 | */ | |
c649114a | 707 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
708 | |
709 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
710 | sizeof(struct vstor_packet), | |
711 | (unsigned long)request, | |
712 | VM_PKT_DATA_INBAND, | |
713 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
714 | if (ret != 0) | |
715 | goto cleanup; | |
716 | ||
717 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
718 | if (t == 0) { | |
719 | ret = -ETIMEDOUT; | |
720 | goto cleanup; | |
721 | } | |
722 | ||
723 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
724 | vstor_packet->status != 0) | |
725 | goto cleanup; | |
726 | ||
727 | ||
728 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
729 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
730 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
731 | vstor_packet->storage_channel_properties.port_number = | |
732 | stor_device->port_number; | |
733 | ||
734 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
735 | sizeof(struct vstor_packet), | |
736 | (unsigned long)request, | |
737 | VM_PKT_DATA_INBAND, | |
738 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
739 | ||
740 | if (ret != 0) | |
741 | goto cleanup; | |
742 | ||
743 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
744 | if (t == 0) { | |
745 | ret = -ETIMEDOUT; | |
746 | goto cleanup; | |
747 | } | |
748 | ||
749 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
750 | vstor_packet->status != 0) | |
751 | goto cleanup; | |
752 | ||
753 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
754 | stor_device->target_id | |
755 | = vstor_packet->storage_channel_properties.target_id; | |
756 | ||
757 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
758 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
759 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
760 | ||
761 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
762 | sizeof(struct vstor_packet), | |
763 | (unsigned long)request, | |
764 | VM_PKT_DATA_INBAND, | |
765 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
766 | ||
767 | if (ret != 0) | |
768 | goto cleanup; | |
769 | ||
770 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
771 | if (t == 0) { | |
772 | ret = -ETIMEDOUT; | |
773 | goto cleanup; | |
774 | } | |
775 | ||
776 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
777 | vstor_packet->status != 0) | |
778 | goto cleanup; | |
779 | ||
780 | ||
781 | cleanup: | |
782 | return ret; | |
783 | } | |
784 | ||
c50bd448 S |
785 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
786 | struct scsi_cmnd *scmnd, | |
787 | struct Scsi_Host *host, | |
788 | u8 asc, u8 ascq) | |
789 | { | |
790 | struct storvsc_scan_work *wrk; | |
791 | void (*process_err_fn)(struct work_struct *work); | |
792 | bool do_work = false; | |
793 | ||
794 | switch (vm_srb->srb_status) { | |
795 | case SRB_STATUS_ERROR: | |
796 | /* | |
797 | * If there is an error; offline the device since all | |
798 | * error recovery strategies would have already been | |
799 | * deployed on the host side. However, if the command | |
800 | * were a pass-through command deal with it appropriately. | |
801 | */ | |
802 | switch (scmnd->cmnd[0]) { | |
803 | case ATA_16: | |
804 | case ATA_12: | |
805 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
806 | break; | |
8ce6d81a S |
807 | /* |
808 | * On Some Windows hosts TEST_UNIT_READY command can return | |
809 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
810 | * based on the sense information. | |
811 | */ | |
812 | case TEST_UNIT_READY: | |
813 | break; | |
c50bd448 S |
814 | default: |
815 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
816 | } | |
817 | break; | |
818 | case SRB_STATUS_INVALID_LUN: | |
819 | do_work = true; | |
820 | process_err_fn = storvsc_remove_lun; | |
821 | break; | |
6781209e S |
822 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
823 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
824 | do_work = true; | |
825 | process_err_fn = storvsc_device_scan; | |
826 | /* | |
827 | * Retry the I/O that trigerred this. | |
828 | */ | |
829 | set_host_byte(scmnd, DID_REQUEUE); | |
830 | } | |
831 | break; | |
c50bd448 | 832 | } |
6781209e | 833 | |
c50bd448 S |
834 | if (!do_work) |
835 | return; | |
836 | ||
837 | /* | |
838 | * We need to schedule work to process this error; schedule it. | |
839 | */ | |
840 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
841 | if (!wrk) { | |
842 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
843 | return; | |
844 | } | |
845 | ||
846 | wrk->host = host; | |
847 | wrk->lun = vm_srb->lun; | |
848 | INIT_WORK(&wrk->work, process_err_fn); | |
849 | schedule_work(&wrk->work); | |
850 | } | |
851 | ||
2707388c | 852 | |
61eaffc9 | 853 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 854 | { |
2707388c S |
855 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
856 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
857 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
858 | struct scsi_sense_hdr sense_hdr; | |
859 | struct vmscsi_request *vm_srb; | |
2707388c | 860 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c50bd448 S |
861 | struct Scsi_Host *host; |
862 | struct storvsc_device *stor_dev; | |
863 | struct hv_device *dev = host_dev->dev; | |
864 | ||
865 | stor_dev = get_in_stor_device(dev); | |
866 | host = stor_dev->host; | |
8dcf37d4 | 867 | |
61eaffc9 | 868 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
869 | if (cmd_request->bounce_sgl_count) { |
870 | if (vm_srb->data_in == READ_TYPE) | |
871 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
872 | cmd_request->bounce_sgl, | |
873 | scsi_sg_count(scmnd), | |
874 | cmd_request->bounce_sgl_count); | |
875 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
876 | cmd_request->bounce_sgl_count); | |
877 | } | |
8dcf37d4 | 878 | |
42e22cac S |
879 | scmnd->result = vm_srb->scsi_status; |
880 | ||
2707388c S |
881 | if (scmnd->result) { |
882 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
883 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
884 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
885 | } | |
886 | ||
c50bd448 S |
887 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
888 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
889 | sense_hdr.ascq); | |
890 | ||
2707388c | 891 | scsi_set_resid(scmnd, |
61eaffc9 | 892 | cmd_request->data_buffer.len - |
2707388c S |
893 | vm_srb->data_transfer_length); |
894 | ||
895 | scsi_done_fn = scmnd->scsi_done; | |
896 | ||
897 | scmnd->host_scribble = NULL; | |
898 | scmnd->scsi_done = NULL; | |
899 | ||
900 | scsi_done_fn(scmnd); | |
901 | ||
902 | mempool_free(cmd_request, memp->request_mempool); | |
903 | } | |
904 | ||
905 | static void storvsc_on_io_completion(struct hv_device *device, | |
906 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 907 | struct storvsc_cmd_request *request) |
2707388c S |
908 | { |
909 | struct storvsc_device *stor_device; | |
910 | struct vstor_packet *stor_pkt; | |
911 | ||
912 | stor_device = hv_get_drvdata(device); | |
913 | stor_pkt = &request->vstor_packet; | |
914 | ||
915 | /* | |
916 | * The current SCSI handling on the host side does | |
917 | * not correctly handle: | |
918 | * INQUIRY command with page code parameter set to 0x80 | |
919 | * MODE_SENSE command with cmd[2] == 0x1c | |
920 | * | |
921 | * Setup srb and scsi status so this won't be fatal. | |
922 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
923 | * (srb status == 0x4) and off-line the device in that case. |
924 | */ | |
925 | ||
926 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 927 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 928 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 929 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
930 | } |
931 | ||
8dcf37d4 S |
932 | |
933 | /* Copy over the status...etc */ | |
934 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
935 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
936 | stor_pkt->vm_srb.sense_info_length = | |
937 | vstor_packet->vm_srb.sense_info_length; | |
938 | ||
939 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 940 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
941 | dev_warn(&device->device, |
942 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
943 | stor_pkt->vm_srb.cdb[0], | |
944 | vstor_packet->vm_srb.scsi_status, | |
945 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
946 | } |
947 | ||
948 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
949 | /* CHECK_CONDITION */ | |
16046320 S |
950 | if (vstor_packet->vm_srb.srb_status & |
951 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 952 | /* autosense data available */ |
d181daa0 | 953 | dev_warn(&device->device, |
41098f8f S |
954 | "stor pkt %p autosense data valid - len %d\n", |
955 | request, | |
956 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
957 | |
958 | memcpy(request->sense_buffer, | |
959 | vstor_packet->vm_srb.sense_data, | |
960 | vstor_packet->vm_srb.sense_info_length); | |
961 | ||
962 | } | |
963 | } | |
964 | ||
965 | stor_pkt->vm_srb.data_transfer_length = | |
966 | vstor_packet->vm_srb.data_transfer_length; | |
967 | ||
2707388c | 968 | storvsc_command_completion(request); |
8dcf37d4 S |
969 | |
970 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
971 | stor_device->drain_notify) | |
972 | wake_up(&stor_device->waiting_to_drain); | |
973 | ||
974 | ||
975 | } | |
976 | ||
977 | static void storvsc_on_receive(struct hv_device *device, | |
978 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 979 | struct storvsc_cmd_request *request) |
8dcf37d4 | 980 | { |
12675799 S |
981 | struct storvsc_scan_work *work; |
982 | struct storvsc_device *stor_device; | |
983 | ||
8dcf37d4 S |
984 | switch (vstor_packet->operation) { |
985 | case VSTOR_OPERATION_COMPLETE_IO: | |
986 | storvsc_on_io_completion(device, vstor_packet, request); | |
987 | break; | |
12675799 | 988 | |
8dcf37d4 | 989 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
990 | case VSTOR_OPERATION_ENUMERATE_BUS: |
991 | stor_device = get_in_stor_device(device); | |
992 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
993 | if (!work) | |
994 | return; | |
995 | ||
996 | INIT_WORK(&work->work, storvsc_bus_scan); | |
997 | work->host = stor_device->host; | |
998 | schedule_work(&work->work); | |
999 | break; | |
8dcf37d4 S |
1000 | |
1001 | default: | |
1002 | break; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static void storvsc_on_channel_callback(void *context) | |
1007 | { | |
1008 | struct hv_device *device = (struct hv_device *)context; | |
1009 | struct storvsc_device *stor_device; | |
1010 | u32 bytes_recvd; | |
1011 | u64 request_id; | |
1012 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1013 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1014 | int ret; |
1015 | ||
1016 | ||
1017 | stor_device = get_in_stor_device(device); | |
1018 | if (!stor_device) | |
1019 | return; | |
1020 | ||
1021 | do { | |
1022 | ret = vmbus_recvpacket(device->channel, packet, | |
1023 | ALIGN(sizeof(struct vstor_packet), 8), | |
1024 | &bytes_recvd, &request_id); | |
1025 | if (ret == 0 && bytes_recvd > 0) { | |
1026 | ||
61eaffc9 | 1027 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1028 | (unsigned long)request_id; |
1029 | ||
1030 | if ((request == &stor_device->init_request) || | |
1031 | (request == &stor_device->reset_request)) { | |
1032 | ||
1033 | memcpy(&request->vstor_packet, packet, | |
1034 | sizeof(struct vstor_packet)); | |
1035 | complete(&request->wait_event); | |
1036 | } else { | |
1037 | storvsc_on_receive(device, | |
1038 | (struct vstor_packet *)packet, | |
1039 | request); | |
1040 | } | |
1041 | } else { | |
1042 | break; | |
1043 | } | |
1044 | } while (1); | |
1045 | ||
1046 | return; | |
1047 | } | |
1048 | ||
1049 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1050 | { | |
1051 | struct vmstorage_channel_properties props; | |
1052 | int ret; | |
1053 | ||
1054 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1055 | ||
8dcf37d4 S |
1056 | ret = vmbus_open(device->channel, |
1057 | ring_size, | |
1058 | ring_size, | |
1059 | (void *)&props, | |
1060 | sizeof(struct vmstorage_channel_properties), | |
1061 | storvsc_on_channel_callback, device); | |
1062 | ||
1063 | if (ret != 0) | |
1064 | return ret; | |
1065 | ||
1066 | ret = storvsc_channel_init(device); | |
1067 | ||
1068 | return ret; | |
1069 | } | |
1070 | ||
c1b3d067 | 1071 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1072 | { |
1073 | struct storvsc_device *stor_device; | |
1074 | unsigned long flags; | |
1075 | ||
cd654ea1 | 1076 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1077 | |
1078 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1079 | stor_device->destroy = true; | |
1080 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1081 | ||
1082 | /* | |
1083 | * At this point, all outbound traffic should be disable. We | |
1084 | * only allow inbound traffic (responses) to proceed so that | |
1085 | * outstanding requests can be completed. | |
1086 | */ | |
1087 | ||
1088 | storvsc_wait_to_drain(stor_device); | |
1089 | ||
1090 | /* | |
1091 | * Since we have already drained, we don't need to busy wait | |
1092 | * as was done in final_release_stor_device() | |
1093 | * Note that we cannot set the ext pointer to NULL until | |
1094 | * we have drained - to drain the outgoing packets, we need to | |
1095 | * allow incoming packets. | |
1096 | */ | |
1097 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1098 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1099 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1100 | ||
1101 | /* Close the channel */ | |
1102 | vmbus_close(device->channel); | |
1103 | ||
1104 | kfree(stor_device); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
c1b3d067 | 1108 | static int storvsc_do_io(struct hv_device *device, |
61eaffc9 | 1109 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1110 | { |
1111 | struct storvsc_device *stor_device; | |
1112 | struct vstor_packet *vstor_packet; | |
1113 | int ret = 0; | |
1114 | ||
1115 | vstor_packet = &request->vstor_packet; | |
1116 | stor_device = get_out_stor_device(device); | |
1117 | ||
1118 | if (!stor_device) | |
1119 | return -ENODEV; | |
1120 | ||
1121 | ||
1122 | request->device = device; | |
1123 | ||
1124 | ||
1125 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1126 | ||
1127 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
1128 | ||
1129 | ||
6b2f9495 | 1130 | vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; |
8dcf37d4 S |
1131 | |
1132 | ||
1133 | vstor_packet->vm_srb.data_transfer_length = | |
1134 | request->data_buffer.len; | |
1135 | ||
1136 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1137 | ||
1138 | if (request->data_buffer.len) { | |
1139 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
1140 | &request->data_buffer, | |
1141 | vstor_packet, | |
1142 | sizeof(struct vstor_packet), | |
1143 | (unsigned long)request); | |
1144 | } else { | |
1145 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1146 | sizeof(struct vstor_packet), | |
1147 | (unsigned long)request, | |
1148 | VM_PKT_DATA_INBAND, | |
1149 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1150 | } | |
1151 | ||
1152 | if (ret != 0) | |
1153 | return ret; | |
1154 | ||
1155 | atomic_inc(&stor_device->num_outstanding_req); | |
1156 | ||
1157 | return ret; | |
1158 | } | |
1159 | ||
5b60acee S |
1160 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1161 | { | |
ce3e301c S |
1162 | struct stor_mem_pools *memp; |
1163 | int number = STORVSC_MIN_BUF_NR; | |
1164 | ||
1165 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1166 | if (!memp) | |
1167 | return -ENOMEM; | |
1168 | ||
1169 | memp->request_pool = | |
1170 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1171 | sizeof(struct storvsc_cmd_request), 0, | |
1172 | SLAB_HWCACHE_ALIGN, NULL); | |
1173 | ||
1174 | if (!memp->request_pool) | |
1175 | goto err0; | |
1176 | ||
1177 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1178 | mempool_free_slab, | |
1179 | memp->request_pool); | |
1180 | ||
1181 | if (!memp->request_mempool) | |
1182 | goto err1; | |
1183 | ||
1184 | sdevice->hostdata = memp; | |
1185 | ||
5b60acee | 1186 | return 0; |
ce3e301c S |
1187 | |
1188 | err1: | |
1189 | kmem_cache_destroy(memp->request_pool); | |
1190 | ||
1191 | err0: | |
1192 | kfree(memp); | |
1193 | return -ENOMEM; | |
1194 | } | |
1195 | ||
1196 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1197 | { | |
1198 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1199 | ||
535dba0e AN |
1200 | if (!memp) |
1201 | return; | |
1202 | ||
ce3e301c S |
1203 | mempool_destroy(memp->request_mempool); |
1204 | kmem_cache_destroy(memp->request_pool); | |
1205 | kfree(memp); | |
1206 | sdevice->hostdata = NULL; | |
5b60acee S |
1207 | } |
1208 | ||
419f2d03 S |
1209 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1210 | { | |
1211 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1212 | STORVSC_MAX_IO_REQUESTS); | |
1213 | ||
419f2d03 S |
1214 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1215 | ||
419f2d03 | 1216 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1217 | |
3e8f4f40 OH |
1218 | sdevice->no_write_same = 1; |
1219 | ||
419f2d03 S |
1220 | return 0; |
1221 | } | |
1222 | ||
62838ce2 S |
1223 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1224 | sector_t capacity, int *info) | |
1225 | { | |
5326fd5c S |
1226 | sector_t nsect = capacity; |
1227 | sector_t cylinders = nsect; | |
1228 | int heads, sectors_pt; | |
62838ce2 | 1229 | |
5326fd5c S |
1230 | /* |
1231 | * We are making up these values; let us keep it simple. | |
1232 | */ | |
1233 | heads = 0xff; | |
1234 | sectors_pt = 0x3f; /* Sectors per track */ | |
1235 | sector_div(cylinders, heads * sectors_pt); | |
1236 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1237 | cylinders = 0xffff; | |
62838ce2 S |
1238 | |
1239 | info[0] = heads; | |
5326fd5c S |
1240 | info[1] = sectors_pt; |
1241 | info[2] = (int)cylinders; | |
62838ce2 | 1242 | |
62838ce2 S |
1243 | return 0; |
1244 | } | |
aa3d789e | 1245 | |
4b270c8b | 1246 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1247 | { |
4b270c8b S |
1248 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1249 | struct hv_device *device = host_dev->dev; | |
1250 | ||
aa3d789e | 1251 | struct storvsc_device *stor_device; |
61eaffc9 | 1252 | struct storvsc_cmd_request *request; |
aa3d789e S |
1253 | struct vstor_packet *vstor_packet; |
1254 | int ret, t; | |
1255 | ||
aa3d789e | 1256 | |
1eaaddf9 | 1257 | stor_device = get_out_stor_device(device); |
aa3d789e | 1258 | if (!stor_device) |
a00e8224 | 1259 | return FAILED; |
aa3d789e S |
1260 | |
1261 | request = &stor_device->reset_request; | |
1262 | vstor_packet = &request->vstor_packet; | |
1263 | ||
1264 | init_completion(&request->wait_event); | |
1265 | ||
1266 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1267 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1268 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1269 | ||
1270 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1271 | sizeof(struct vstor_packet), | |
1272 | (unsigned long)&stor_device->reset_request, | |
1273 | VM_PKT_DATA_INBAND, | |
1274 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1275 | if (ret != 0) | |
a00e8224 | 1276 | return FAILED; |
aa3d789e | 1277 | |
46d2eb6d | 1278 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1279 | if (t == 0) |
1280 | return TIMEOUT_ERROR; | |
aa3d789e | 1281 | |
aa3d789e S |
1282 | |
1283 | /* | |
1284 | * At this point, all outstanding requests in the adapter | |
1285 | * should have been flushed out and return to us | |
5c1b10ab S |
1286 | * There is a potential race here where the host may be in |
1287 | * the process of responding when we return from here. | |
1288 | * Just wait for all in-transit packets to be accounted for | |
1289 | * before we return from here. | |
aa3d789e | 1290 | */ |
5c1b10ab | 1291 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1292 | |
a00e8224 | 1293 | return SUCCESS; |
aa3d789e S |
1294 | } |
1295 | ||
7afc3ac1 S |
1296 | /* |
1297 | * The host guarantees to respond to each command, although I/O latencies might | |
1298 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1299 | * chance to perform EH. | |
1300 | */ | |
1301 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1302 | { | |
1303 | return BLK_EH_RESET_TIMER; | |
1304 | } | |
1305 | ||
c77b63b6 | 1306 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1307 | { |
1308 | bool allowed = true; | |
1309 | u8 scsi_op = scmnd->cmnd[0]; | |
1310 | ||
1311 | switch (scsi_op) { | |
3e8f4f40 OH |
1312 | /* the host does not handle WRITE_SAME, log accident usage */ |
1313 | case WRITE_SAME: | |
c77b63b6 S |
1314 | /* |
1315 | * smartd sends this command and the host does not handle | |
1316 | * this. So, don't send it. | |
1317 | */ | |
41098f8f | 1318 | case SET_WINDOW: |
59e00e74 | 1319 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1320 | allowed = false; |
1321 | break; | |
1322 | default: | |
1323 | break; | |
92ae4ebd OH |
1324 | } |
1325 | return allowed; | |
1326 | } | |
c5b463ae | 1327 | |
bab445e1 | 1328 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1329 | { |
1330 | int ret; | |
bab445e1 | 1331 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1332 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1333 | struct storvsc_cmd_request *cmd_request; |
1334 | unsigned int request_size = 0; | |
1335 | int i; | |
1336 | struct scatterlist *sgl; | |
1337 | unsigned int sg_count = 0; | |
1338 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1339 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1340 | |
c77b63b6 | 1341 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1342 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1343 | return 0; |
1344 | } | |
c5b463ae | 1345 | |
c5b463ae S |
1346 | request_size = sizeof(struct storvsc_cmd_request); |
1347 | ||
ce3e301c | 1348 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1349 | GFP_ATOMIC); |
c77b63b6 S |
1350 | |
1351 | /* | |
1352 | * We might be invoked in an interrupt context; hence | |
1353 | * mempool_alloc() can fail. | |
1354 | */ | |
bab445e1 | 1355 | if (!cmd_request) |
c5b463ae | 1356 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1357 | |
4e03e697 | 1358 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1359 | |
1360 | /* Setup the cmd request */ | |
c5b463ae S |
1361 | cmd_request->cmd = scmnd; |
1362 | ||
1363 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1364 | ||
61eaffc9 | 1365 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
c5b463ae S |
1366 | |
1367 | ||
1368 | /* Build the SRB */ | |
1369 | switch (scmnd->sc_data_direction) { | |
1370 | case DMA_TO_DEVICE: | |
1371 | vm_srb->data_in = WRITE_TYPE; | |
1372 | break; | |
1373 | case DMA_FROM_DEVICE: | |
1374 | vm_srb->data_in = READ_TYPE; | |
1375 | break; | |
1376 | default: | |
1377 | vm_srb->data_in = UNKNOWN_TYPE; | |
1378 | break; | |
1379 | } | |
1380 | ||
c5b463ae | 1381 | |
c5b463ae S |
1382 | vm_srb->port_number = host_dev->port; |
1383 | vm_srb->path_id = scmnd->device->channel; | |
1384 | vm_srb->target_id = scmnd->device->id; | |
1385 | vm_srb->lun = scmnd->device->lun; | |
1386 | ||
c5b463ae S |
1387 | vm_srb->cdb_length = scmnd->cmd_len; |
1388 | ||
1389 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1390 | ||
61eaffc9 | 1391 | cmd_request->sense_buffer = scmnd->sense_buffer; |
c5b463ae S |
1392 | |
1393 | ||
61eaffc9 | 1394 | cmd_request->data_buffer.len = scsi_bufflen(scmnd); |
c5b463ae S |
1395 | if (scsi_sg_count(scmnd)) { |
1396 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1397 | sg_count = scsi_sg_count(scmnd); | |
1398 | ||
1399 | /* check if we need to bounce the sgl */ | |
1400 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1401 | cmd_request->bounce_sgl = | |
1402 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1403 | scsi_bufflen(scmnd), |
1404 | vm_srb->data_in); | |
c5b463ae | 1405 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1406 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1407 | goto queue_error; | |
c5b463ae S |
1408 | } |
1409 | ||
1410 | cmd_request->bounce_sgl_count = | |
1411 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1412 | PAGE_SHIFT; | |
1413 | ||
fa23b8c7 S |
1414 | if (vm_srb->data_in == WRITE_TYPE) |
1415 | copy_to_bounce_buffer(sgl, | |
1416 | cmd_request->bounce_sgl, | |
1417 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1418 | |
1419 | sgl = cmd_request->bounce_sgl; | |
1420 | sg_count = cmd_request->bounce_sgl_count; | |
1421 | } | |
1422 | ||
61eaffc9 | 1423 | cmd_request->data_buffer.offset = sgl[0].offset; |
c5b463ae S |
1424 | |
1425 | for (i = 0; i < sg_count; i++) | |
61eaffc9 | 1426 | cmd_request->data_buffer.pfn_array[i] = |
c5b463ae S |
1427 | page_to_pfn(sg_page((&sgl[i]))); |
1428 | ||
1429 | } else if (scsi_sglist(scmnd)) { | |
61eaffc9 | 1430 | cmd_request->data_buffer.offset = |
c5b463ae | 1431 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
61eaffc9 | 1432 | cmd_request->data_buffer.pfn_array[0] = |
c5b463ae S |
1433 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1434 | } | |
1435 | ||
c5b463ae | 1436 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1437 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1438 | |
d2598f01 | 1439 | if (ret == -EAGAIN) { |
c5b463ae S |
1440 | /* no more space */ |
1441 | ||
c77b63b6 | 1442 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1443 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1444 | cmd_request->bounce_sgl_count); |
c5b463ae | 1445 | |
c77b63b6 S |
1446 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1447 | goto queue_error; | |
1448 | } | |
c5b463ae S |
1449 | } |
1450 | ||
c77b63b6 S |
1451 | return 0; |
1452 | ||
1453 | queue_error: | |
1454 | mempool_free(cmd_request, memp->request_mempool); | |
1455 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1456 | return ret; |
1457 | } | |
1458 | ||
bef4a34a | 1459 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1460 | .module = THIS_MODULE, |
1461 | .name = "storvsc_host_t", | |
1462 | .bios_param = storvsc_get_chs, | |
1463 | .queuecommand = storvsc_queuecommand, | |
1464 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
7afc3ac1 | 1465 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1466 | .slave_alloc = storvsc_device_alloc, |
ce3e301c | 1467 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1468 | .slave_configure = storvsc_device_configure, |
1469 | .cmd_per_lun = 1, | |
1470 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1471 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1472 | .this_id = -1, |
454f18a9 | 1473 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1474 | /* currently 32 */ |
1475 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1476 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1477 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1478 | .dma_boundary = PAGE_SIZE-1, |
8562d028 | 1479 | .no_write_same = 1, |
bef4a34a HJ |
1480 | }; |
1481 | ||
ef52a81b S |
1482 | enum { |
1483 | SCSI_GUID, | |
1484 | IDE_GUID, | |
1485 | }; | |
1486 | ||
d847b5fe | 1487 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1488 | /* SCSI guid */ |
35c3bc20 S |
1489 | { HV_SCSI_GUID, |
1490 | .driver_data = SCSI_GUID | |
1491 | }, | |
21e37742 | 1492 | /* IDE guid */ |
35c3bc20 S |
1493 | { HV_IDE_GUID, |
1494 | .driver_data = IDE_GUID | |
1495 | }, | |
c45cf2d4 | 1496 | { }, |
d847b5fe | 1497 | }; |
bef4a34a | 1498 | |
d847b5fe | 1499 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1500 | |
84946899 S |
1501 | static int storvsc_probe(struct hv_device *device, |
1502 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1503 | { |
ff568d3a | 1504 | int ret; |
bef4a34a | 1505 | struct Scsi_Host *host; |
795b613d | 1506 | struct hv_host_device *host_dev; |
ef52a81b | 1507 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1508 | int target = 0; |
6e4198ce | 1509 | struct storvsc_device *stor_device; |
bd1f5d6a | 1510 | |
ff568d3a | 1511 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1512 | sizeof(struct hv_host_device)); |
f8feed06 | 1513 | if (!host) |
bef4a34a | 1514 | return -ENOMEM; |
bef4a34a | 1515 | |
7f33f30a | 1516 | host_dev = shost_priv(host); |
795b613d | 1517 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1518 | |
795b613d | 1519 | host_dev->port = host->host_no; |
97c15296 | 1520 | host_dev->dev = device; |
bef4a34a | 1521 | |
4e03e697 | 1522 | |
a13d35ab | 1523 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1524 | if (!stor_device) { |
225ce6ea | 1525 | ret = -ENOMEM; |
ce3e301c | 1526 | goto err_out0; |
6e4198ce | 1527 | } |
9efd21e1 | 1528 | |
a13d35ab S |
1529 | stor_device->destroy = false; |
1530 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1531 | stor_device->device = device; | |
cd654ea1 S |
1532 | stor_device->host = host; |
1533 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1534 | |
6e4198ce S |
1535 | stor_device->port_number = host->host_no; |
1536 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1537 | if (ret) |
ce3e301c | 1538 | goto err_out1; |
bef4a34a | 1539 | |
6e4198ce S |
1540 | host_dev->path = stor_device->path_id; |
1541 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1542 | |
ff568d3a GKH |
1543 | /* max # of devices per target */ |
1544 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1545 | /* max # of targets per channel */ | |
1546 | host->max_id = STORVSC_MAX_TARGETS; | |
1547 | /* max # of channels */ | |
1548 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1549 | /* max cmd length */ |
1550 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1551 | |
454f18a9 | 1552 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1553 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1554 | if (ret != 0) |
ce3e301c | 1555 | goto err_out2; |
bef4a34a | 1556 | |
bd1f5d6a S |
1557 | if (!dev_is_ide) { |
1558 | scsi_scan_host(host); | |
59d22950 S |
1559 | } else { |
1560 | target = (device->dev_instance.b[5] << 8 | | |
1561 | device->dev_instance.b[4]); | |
1562 | ret = scsi_add_device(host, 0, target, 0); | |
1563 | if (ret) { | |
1564 | scsi_remove_host(host); | |
1565 | goto err_out2; | |
1566 | } | |
bef4a34a | 1567 | } |
bd1f5d6a | 1568 | return 0; |
bef4a34a | 1569 | |
ce3e301c | 1570 | err_out2: |
225ce6ea S |
1571 | /* |
1572 | * Once we have connected with the host, we would need to | |
1573 | * to invoke storvsc_dev_remove() to rollback this state and | |
1574 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1575 | * err_out1 label. |
225ce6ea | 1576 | */ |
bd1f5d6a | 1577 | storvsc_dev_remove(device); |
ce3e301c | 1578 | goto err_out0; |
225ce6ea S |
1579 | |
1580 | err_out1: | |
ce3e301c | 1581 | kfree(stor_device); |
225ce6ea S |
1582 | |
1583 | err_out0: | |
bd1f5d6a | 1584 | scsi_host_put(host); |
225ce6ea | 1585 | return ret; |
bef4a34a HJ |
1586 | } |
1587 | ||
ddcbf65e S |
1588 | static int storvsc_remove(struct hv_device *dev) |
1589 | { | |
1590 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1591 | struct Scsi_Host *host = stor_device->host; | |
1592 | ||
1593 | scsi_remove_host(host); | |
1594 | storvsc_dev_remove(dev); | |
1595 | scsi_host_put(host); | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
40bf63ed | 1600 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1601 | .name = KBUILD_MODNAME, |
d847b5fe | 1602 | .id_table = id_table, |
40bf63ed S |
1603 | .probe = storvsc_probe, |
1604 | .remove = storvsc_remove, | |
39ae6fae | 1605 | }; |
7bd05b91 | 1606 | |
d9bbae83 | 1607 | static int __init storvsc_drv_init(void) |
f5c78872 | 1608 | { |
01415ab3 S |
1609 | u32 max_outstanding_req_per_channel; |
1610 | ||
1611 | /* | |
1612 | * Divide the ring buffer data size (which is 1 page less | |
1613 | * than the ring buffer size since that page is reserved for | |
1614 | * the ring buffer indices) by the max request size (which is | |
1615 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1616 | */ | |
01415ab3 | 1617 | max_outstanding_req_per_channel = |
768fa219 GKH |
1618 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1619 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1620 | sizeof(struct vstor_packet) + sizeof(u64), | |
1621 | sizeof(u64))); | |
f5c78872 | 1622 | |
01415ab3 | 1623 | if (max_outstanding_req_per_channel < |
f5c78872 | 1624 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1625 | return -EINVAL; |
f5c78872 | 1626 | |
768fa219 | 1627 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1628 | } |
1629 | ||
c63ba9e1 | 1630 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1631 | { |
768fa219 | 1632 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1633 | } |
1634 | ||
ff568d3a | 1635 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1636 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1637 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1638 | module_init(storvsc_drv_init); |
c63ba9e1 | 1639 | module_exit(storvsc_drv_exit); |