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 | |
f0d79fe9 | 45 | |
4e03e697 | 46 | #define STORVSC_MIN_BUF_NR 64 |
c1b3d067 S |
47 | #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
48 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
49 | ||
50 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
51 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
52 | ||
09f0355f S |
53 | /* |
54 | * To alert the user that structure sizes may be mismatched even though the | |
55 | * protocol versions match. | |
56 | */ | |
f0d79fe9 S |
57 | |
58 | ||
59 | #define REVISION_STRING(REVISION_) #REVISION_ | |
60 | #define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \ | |
61 | do { \ | |
62 | char *revision_string \ | |
63 | = REVISION_STRING($Rev : 6 $) + 6; \ | |
64 | RESULT_LVALUE_ = 0; \ | |
65 | while (*revision_string >= '0' \ | |
66 | && *revision_string <= '9') { \ | |
67 | RESULT_LVALUE_ *= 10; \ | |
68 | RESULT_LVALUE_ += *revision_string - '0'; \ | |
69 | revision_string++; \ | |
70 | } \ | |
71 | } while (0) | |
72 | ||
09f0355f S |
73 | /* |
74 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
75 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
76 | */ | |
77 | ||
f0d79fe9 S |
78 | #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) |
79 | #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) | |
80 | #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ | |
81 | (((MINOR_) & 0xff))) | |
82 | #define VMSTOR_INVALID_PROTOCOL_VERSION (-1) | |
83 | ||
09f0355f S |
84 | /* |
85 | * Version history: | |
86 | * V1 Beta: 0.1 | |
87 | * V1 RC < 2008/1/31: 1.0 | |
88 | * V1 RC > 2008/1/31: 2.0 | |
89 | * Win7: 4.2 | |
90 | */ | |
91 | ||
2b9525f5 | 92 | #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2) |
f0d79fe9 S |
93 | |
94 | ||
95 | ||
96 | ||
09f0355f S |
97 | /* |
98 | * This will get replaced with the max transfer length that is possible on | |
99 | * the host adapter. | |
100 | * The max transfer length will be published when we offer a vmbus channel. | |
101 | */ | |
102 | ||
f0d79fe9 S |
103 | #define MAX_TRANSFER_LENGTH 0x40000 |
104 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
105 | sizeof(struct vstor_packet) + \ | |
106 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
107 | ||
108 | ||
109 | /* Packet structure describing virtual storage requests. */ | |
110 | enum vstor_packet_operation { | |
111 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
112 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
113 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
114 | VSTOR_OPERATION_RESET_LUN = 4, | |
115 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
116 | VSTOR_OPERATION_RESET_BUS = 6, | |
117 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
118 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
119 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
120 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
121 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
122 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
123 | }; |
124 | ||
125 | /* | |
126 | * Platform neutral description of a scsi request - | |
127 | * this remains the same across the write regardless of 32/64 bit | |
128 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
129 | */ | |
130 | #define CDB16GENERIC_LENGTH 0x10 | |
131 | ||
132 | #ifndef SENSE_BUFFER_SIZE | |
133 | #define SENSE_BUFFER_SIZE 0x12 | |
134 | #endif | |
135 | ||
136 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
137 | ||
138 | struct vmscsi_request { | |
139 | unsigned short length; | |
140 | unsigned char srb_status; | |
141 | unsigned char scsi_status; | |
142 | ||
143 | unsigned char port_number; | |
144 | unsigned char path_id; | |
145 | unsigned char target_id; | |
146 | unsigned char lun; | |
147 | ||
148 | unsigned char cdb_length; | |
149 | unsigned char sense_info_length; | |
150 | unsigned char data_in; | |
151 | unsigned char reserved; | |
152 | ||
153 | unsigned int data_transfer_length; | |
154 | ||
155 | union { | |
156 | unsigned char cdb[CDB16GENERIC_LENGTH]; | |
157 | unsigned char sense_data[SENSE_BUFFER_SIZE]; | |
158 | unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
159 | }; | |
160 | } __attribute((packed)); | |
161 | ||
162 | ||
163 | /* | |
164 | * This structure is sent during the intialization phase to get the different | |
165 | * properties of the channel. | |
166 | */ | |
167 | struct vmstorage_channel_properties { | |
168 | unsigned short protocol_version; | |
169 | unsigned char path_id; | |
170 | unsigned char target_id; | |
171 | ||
172 | /* Note: port number is only really known on the client side */ | |
173 | unsigned int port_number; | |
174 | unsigned int flags; | |
175 | unsigned int max_transfer_bytes; | |
176 | ||
177 | /* This id is unique for each channel and will correspond with */ | |
178 | /* vendor specific data in the inquirydata */ | |
179 | unsigned long long unique_id; | |
180 | } __packed; | |
181 | ||
182 | /* This structure is sent during the storage protocol negotiations. */ | |
183 | struct vmstorage_protocol_version { | |
184 | /* Major (MSW) and minor (LSW) version numbers. */ | |
185 | unsigned short major_minor; | |
186 | ||
187 | /* | |
188 | * Revision number is auto-incremented whenever this file is changed | |
189 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
190 | * definitely indicate incompatibility--but it does indicate mismatched | |
191 | * builds. | |
192 | */ | |
193 | unsigned short revision; | |
194 | } __packed; | |
195 | ||
196 | /* Channel Property Flags */ | |
197 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
198 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
199 | ||
200 | struct vstor_packet { | |
201 | /* Requested operation type */ | |
202 | enum vstor_packet_operation operation; | |
203 | ||
204 | /* Flags - see below for values */ | |
205 | unsigned int flags; | |
206 | ||
207 | /* Status of the request returned from the server side. */ | |
208 | unsigned int status; | |
209 | ||
210 | /* Data payload area */ | |
211 | union { | |
212 | /* | |
213 | * Structure used to forward SCSI commands from the | |
214 | * client to the server. | |
215 | */ | |
216 | struct vmscsi_request vm_srb; | |
217 | ||
218 | /* Structure used to query channel properties. */ | |
219 | struct vmstorage_channel_properties storage_channel_properties; | |
220 | ||
221 | /* Used during version negotiations. */ | |
222 | struct vmstorage_protocol_version version; | |
223 | }; | |
224 | } __packed; | |
225 | ||
f0d79fe9 | 226 | /* |
09f0355f S |
227 | * Packet Flags: |
228 | * | |
f0d79fe9 S |
229 | * This flag indicates that the server should send back a completion for this |
230 | * packet. | |
231 | */ | |
09f0355f | 232 | |
f0d79fe9 S |
233 | #define REQUEST_COMPLETION_FLAG 0x1 |
234 | ||
235 | /* This is the set of flags that the vsc can set in any packets it sends */ | |
236 | #define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG) | |
237 | ||
238 | ||
f0d79fe9 S |
239 | |
240 | #define STORVSC_MAX_IO_REQUESTS 128 | |
241 | ||
242 | /* | |
243 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
244 | * reality, the path/target is not used (ie always set to 0) so our | |
245 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
246 | * up to 256 luns. | |
247 | */ | |
248 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
249 | #define STORVSC_MAX_TARGETS 1 | |
250 | #define STORVSC_MAX_CHANNELS 1 | |
cf55f4a8 | 251 | #define STORVSC_MAX_CMD_LEN 16 |
f0d79fe9 | 252 | |
f0d79fe9 S |
253 | /* Matches Windows-end */ |
254 | enum storvsc_request_type { | |
255 | WRITE_TYPE, | |
256 | READ_TYPE, | |
257 | UNKNOWN_TYPE, | |
258 | }; | |
259 | ||
16046320 S |
260 | /* |
261 | * SRB status codes and masks; a subset of the codes used here. | |
262 | */ | |
263 | ||
264 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
265 | #define SRB_STATUS_INVALID_LUN 0x20 | |
266 | #define SRB_STATUS_SUCCESS 0x01 | |
267 | #define SRB_STATUS_ERROR 0x04 | |
268 | ||
269 | ||
f0d79fe9 S |
270 | |
271 | struct hv_storvsc_request { | |
f0d79fe9 S |
272 | struct hv_device *device; |
273 | ||
274 | /* Synchronize the request/response if needed */ | |
275 | struct completion wait_event; | |
276 | ||
277 | unsigned char *sense_buffer; | |
278 | void *context; | |
279 | void (*on_io_completion)(struct hv_storvsc_request *request); | |
280 | struct hv_multipage_buffer data_buffer; | |
281 | ||
282 | struct vstor_packet vstor_packet; | |
283 | }; | |
284 | ||
285 | ||
f0d79fe9 S |
286 | /* A storvsc device is a device object that contains a vmbus channel */ |
287 | struct storvsc_device { | |
288 | struct hv_device *device; | |
289 | ||
290 | bool destroy; | |
291 | bool drain_notify; | |
292 | atomic_t num_outstanding_req; | |
cd654ea1 | 293 | struct Scsi_Host *host; |
f0d79fe9 S |
294 | |
295 | wait_queue_head_t waiting_to_drain; | |
296 | ||
297 | /* | |
298 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
299 | * controller. In reality, the pathid, targetid is always 0 | |
300 | * and the port is set by us | |
301 | */ | |
302 | unsigned int port_number; | |
303 | unsigned char path_id; | |
304 | unsigned char target_id; | |
305 | ||
306 | /* Used for vsc/vsp channel reset process */ | |
307 | struct hv_storvsc_request init_request; | |
308 | struct hv_storvsc_request reset_request; | |
309 | }; | |
310 | ||
ce3e301c | 311 | struct stor_mem_pools { |
c1b3d067 | 312 | struct kmem_cache *request_pool; |
4e03e697 | 313 | mempool_t *request_mempool; |
ce3e301c S |
314 | }; |
315 | ||
316 | struct hv_host_device { | |
317 | struct hv_device *dev; | |
c1b3d067 S |
318 | unsigned int port; |
319 | unsigned char path; | |
320 | unsigned char target; | |
321 | }; | |
322 | ||
323 | struct storvsc_cmd_request { | |
324 | struct list_head entry; | |
325 | struct scsi_cmnd *cmd; | |
326 | ||
327 | unsigned int bounce_sgl_count; | |
328 | struct scatterlist *bounce_sgl; | |
329 | ||
330 | struct hv_storvsc_request request; | |
331 | }; | |
f0d79fe9 | 332 | |
12675799 S |
333 | struct storvsc_scan_work { |
334 | struct work_struct work; | |
335 | struct Scsi_Host *host; | |
336 | uint lun; | |
337 | }; | |
338 | ||
339 | static void storvsc_bus_scan(struct work_struct *work) | |
340 | { | |
341 | struct storvsc_scan_work *wrk; | |
342 | int id, order_id; | |
343 | ||
344 | wrk = container_of(work, struct storvsc_scan_work, work); | |
345 | for (id = 0; id < wrk->host->max_id; ++id) { | |
346 | if (wrk->host->reverse_ordering) | |
347 | order_id = wrk->host->max_id - id - 1; | |
348 | else | |
349 | order_id = id; | |
350 | ||
351 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
352 | order_id, SCAN_WILD_CARD, 1); | |
353 | } | |
354 | kfree(wrk); | |
355 | } | |
356 | ||
b4017319 S |
357 | static void storvsc_remove_lun(struct work_struct *work) |
358 | { | |
359 | struct storvsc_scan_work *wrk; | |
360 | struct scsi_device *sdev; | |
361 | ||
362 | wrk = container_of(work, struct storvsc_scan_work, work); | |
363 | if (!scsi_host_get(wrk->host)) | |
364 | goto done; | |
365 | ||
366 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
367 | ||
368 | if (sdev) { | |
369 | scsi_remove_device(sdev); | |
370 | scsi_device_put(sdev); | |
371 | } | |
372 | scsi_host_put(wrk->host); | |
373 | ||
374 | done: | |
375 | kfree(wrk); | |
376 | } | |
377 | ||
f0d79fe9 S |
378 | static inline struct storvsc_device *get_out_stor_device( |
379 | struct hv_device *device) | |
380 | { | |
381 | struct storvsc_device *stor_device; | |
382 | ||
cd654ea1 | 383 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
384 | |
385 | if (stor_device && stor_device->destroy) | |
386 | stor_device = NULL; | |
387 | ||
388 | return stor_device; | |
389 | } | |
390 | ||
391 | ||
392 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
393 | { | |
394 | dev->drain_notify = true; | |
395 | wait_event(dev->waiting_to_drain, | |
396 | atomic_read(&dev->num_outstanding_req) == 0); | |
397 | dev->drain_notify = false; | |
398 | } | |
bef4a34a | 399 | |
8dcf37d4 S |
400 | static inline struct storvsc_device *get_in_stor_device( |
401 | struct hv_device *device) | |
402 | { | |
403 | struct storvsc_device *stor_device; | |
8dcf37d4 | 404 | |
cd654ea1 | 405 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
406 | |
407 | if (!stor_device) | |
408 | goto get_in_err; | |
409 | ||
410 | /* | |
411 | * If the device is being destroyed; allow incoming | |
412 | * traffic only to cleanup outstanding requests. | |
413 | */ | |
414 | ||
415 | if (stor_device->destroy && | |
416 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
417 | stor_device = NULL; | |
418 | ||
419 | get_in_err: | |
8dcf37d4 S |
420 | return stor_device; |
421 | ||
422 | } | |
423 | ||
424 | static int storvsc_channel_init(struct hv_device *device) | |
425 | { | |
426 | struct storvsc_device *stor_device; | |
427 | struct hv_storvsc_request *request; | |
428 | struct vstor_packet *vstor_packet; | |
429 | int ret, t; | |
430 | ||
431 | stor_device = get_out_stor_device(device); | |
432 | if (!stor_device) | |
433 | return -ENODEV; | |
434 | ||
435 | request = &stor_device->init_request; | |
436 | vstor_packet = &request->vstor_packet; | |
437 | ||
438 | /* | |
439 | * Now, initiate the vsc/vsp initialization protocol on the open | |
440 | * channel | |
441 | */ | |
442 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
443 | init_completion(&request->wait_event); | |
444 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
445 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
446 | ||
447 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
448 | sizeof(struct vstor_packet), | |
449 | (unsigned long)request, | |
450 | VM_PKT_DATA_INBAND, | |
451 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
452 | if (ret != 0) | |
453 | goto cleanup; | |
454 | ||
455 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
456 | if (t == 0) { | |
457 | ret = -ETIMEDOUT; | |
458 | goto cleanup; | |
459 | } | |
460 | ||
461 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
462 | vstor_packet->status != 0) | |
463 | goto cleanup; | |
464 | ||
465 | ||
466 | /* reuse the packet for version range supported */ | |
467 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
468 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
469 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
470 | ||
471 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
472 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
473 | ||
474 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
475 | sizeof(struct vstor_packet), | |
476 | (unsigned long)request, | |
477 | VM_PKT_DATA_INBAND, | |
478 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
479 | if (ret != 0) | |
480 | goto cleanup; | |
481 | ||
482 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
483 | if (t == 0) { | |
484 | ret = -ETIMEDOUT; | |
485 | goto cleanup; | |
486 | } | |
487 | ||
488 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
489 | vstor_packet->status != 0) | |
490 | goto cleanup; | |
491 | ||
492 | ||
493 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
494 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
495 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
496 | vstor_packet->storage_channel_properties.port_number = | |
497 | stor_device->port_number; | |
498 | ||
499 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
500 | sizeof(struct vstor_packet), | |
501 | (unsigned long)request, | |
502 | VM_PKT_DATA_INBAND, | |
503 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
504 | ||
505 | if (ret != 0) | |
506 | goto cleanup; | |
507 | ||
508 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
509 | if (t == 0) { | |
510 | ret = -ETIMEDOUT; | |
511 | goto cleanup; | |
512 | } | |
513 | ||
514 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
515 | vstor_packet->status != 0) | |
516 | goto cleanup; | |
517 | ||
518 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
519 | stor_device->target_id | |
520 | = vstor_packet->storage_channel_properties.target_id; | |
521 | ||
522 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
523 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
524 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
525 | ||
526 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
527 | sizeof(struct vstor_packet), | |
528 | (unsigned long)request, | |
529 | VM_PKT_DATA_INBAND, | |
530 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
531 | ||
532 | if (ret != 0) | |
533 | goto cleanup; | |
534 | ||
535 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
536 | if (t == 0) { | |
537 | ret = -ETIMEDOUT; | |
538 | goto cleanup; | |
539 | } | |
540 | ||
541 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
542 | vstor_packet->status != 0) | |
543 | goto cleanup; | |
544 | ||
545 | ||
546 | cleanup: | |
547 | return ret; | |
548 | } | |
549 | ||
550 | static void storvsc_on_io_completion(struct hv_device *device, | |
551 | struct vstor_packet *vstor_packet, | |
552 | struct hv_storvsc_request *request) | |
553 | { | |
554 | struct storvsc_device *stor_device; | |
555 | struct vstor_packet *stor_pkt; | |
556 | ||
cd654ea1 | 557 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
558 | stor_pkt = &request->vstor_packet; |
559 | ||
4ed51a21 S |
560 | /* |
561 | * The current SCSI handling on the host side does | |
562 | * not correctly handle: | |
563 | * INQUIRY command with page code parameter set to 0x80 | |
564 | * MODE_SENSE command with cmd[2] == 0x1c | |
565 | * | |
566 | * Setup srb and scsi status so this won't be fatal. | |
567 | * We do this so we can distinguish truly fatal failues | |
568 | * (srb status == 0x4) and off-line the device in that case. | |
569 | */ | |
570 | ||
571 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
572 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { | |
573 | vstor_packet->vm_srb.scsi_status = 0; | |
16046320 | 574 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
575 | } |
576 | ||
8dcf37d4 S |
577 | |
578 | /* Copy over the status...etc */ | |
579 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
580 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
581 | stor_pkt->vm_srb.sense_info_length = | |
582 | vstor_packet->vm_srb.sense_info_length; | |
583 | ||
584 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 585 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
586 | dev_warn(&device->device, |
587 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
588 | stor_pkt->vm_srb.cdb[0], | |
589 | vstor_packet->vm_srb.scsi_status, | |
590 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
591 | } |
592 | ||
593 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
594 | /* CHECK_CONDITION */ | |
16046320 S |
595 | if (vstor_packet->vm_srb.srb_status & |
596 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 597 | /* autosense data available */ |
d181daa0 | 598 | dev_warn(&device->device, |
41098f8f S |
599 | "stor pkt %p autosense data valid - len %d\n", |
600 | request, | |
601 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
602 | |
603 | memcpy(request->sense_buffer, | |
604 | vstor_packet->vm_srb.sense_data, | |
605 | vstor_packet->vm_srb.sense_info_length); | |
606 | ||
607 | } | |
608 | } | |
609 | ||
610 | stor_pkt->vm_srb.data_transfer_length = | |
611 | vstor_packet->vm_srb.data_transfer_length; | |
612 | ||
613 | request->on_io_completion(request); | |
614 | ||
615 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
616 | stor_device->drain_notify) | |
617 | wake_up(&stor_device->waiting_to_drain); | |
618 | ||
619 | ||
620 | } | |
621 | ||
622 | static void storvsc_on_receive(struct hv_device *device, | |
623 | struct vstor_packet *vstor_packet, | |
624 | struct hv_storvsc_request *request) | |
625 | { | |
12675799 S |
626 | struct storvsc_scan_work *work; |
627 | struct storvsc_device *stor_device; | |
628 | ||
8dcf37d4 S |
629 | switch (vstor_packet->operation) { |
630 | case VSTOR_OPERATION_COMPLETE_IO: | |
631 | storvsc_on_io_completion(device, vstor_packet, request); | |
632 | break; | |
12675799 | 633 | |
8dcf37d4 | 634 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
635 | case VSTOR_OPERATION_ENUMERATE_BUS: |
636 | stor_device = get_in_stor_device(device); | |
637 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
638 | if (!work) | |
639 | return; | |
640 | ||
641 | INIT_WORK(&work->work, storvsc_bus_scan); | |
642 | work->host = stor_device->host; | |
643 | schedule_work(&work->work); | |
644 | break; | |
8dcf37d4 S |
645 | |
646 | default: | |
647 | break; | |
648 | } | |
649 | } | |
650 | ||
651 | static void storvsc_on_channel_callback(void *context) | |
652 | { | |
653 | struct hv_device *device = (struct hv_device *)context; | |
654 | struct storvsc_device *stor_device; | |
655 | u32 bytes_recvd; | |
656 | u64 request_id; | |
657 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
658 | struct hv_storvsc_request *request; | |
659 | int ret; | |
660 | ||
661 | ||
662 | stor_device = get_in_stor_device(device); | |
663 | if (!stor_device) | |
664 | return; | |
665 | ||
666 | do { | |
667 | ret = vmbus_recvpacket(device->channel, packet, | |
668 | ALIGN(sizeof(struct vstor_packet), 8), | |
669 | &bytes_recvd, &request_id); | |
670 | if (ret == 0 && bytes_recvd > 0) { | |
671 | ||
672 | request = (struct hv_storvsc_request *) | |
673 | (unsigned long)request_id; | |
674 | ||
675 | if ((request == &stor_device->init_request) || | |
676 | (request == &stor_device->reset_request)) { | |
677 | ||
678 | memcpy(&request->vstor_packet, packet, | |
679 | sizeof(struct vstor_packet)); | |
680 | complete(&request->wait_event); | |
681 | } else { | |
682 | storvsc_on_receive(device, | |
683 | (struct vstor_packet *)packet, | |
684 | request); | |
685 | } | |
686 | } else { | |
687 | break; | |
688 | } | |
689 | } while (1); | |
690 | ||
691 | return; | |
692 | } | |
693 | ||
694 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
695 | { | |
696 | struct vmstorage_channel_properties props; | |
697 | int ret; | |
698 | ||
699 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
700 | ||
8dcf37d4 S |
701 | ret = vmbus_open(device->channel, |
702 | ring_size, | |
703 | ring_size, | |
704 | (void *)&props, | |
705 | sizeof(struct vmstorage_channel_properties), | |
706 | storvsc_on_channel_callback, device); | |
707 | ||
708 | if (ret != 0) | |
709 | return ret; | |
710 | ||
711 | ret = storvsc_channel_init(device); | |
712 | ||
713 | return ret; | |
714 | } | |
715 | ||
c1b3d067 | 716 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
717 | { |
718 | struct storvsc_device *stor_device; | |
719 | unsigned long flags; | |
720 | ||
cd654ea1 | 721 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
722 | |
723 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
724 | stor_device->destroy = true; | |
725 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
726 | ||
727 | /* | |
728 | * At this point, all outbound traffic should be disable. We | |
729 | * only allow inbound traffic (responses) to proceed so that | |
730 | * outstanding requests can be completed. | |
731 | */ | |
732 | ||
733 | storvsc_wait_to_drain(stor_device); | |
734 | ||
735 | /* | |
736 | * Since we have already drained, we don't need to busy wait | |
737 | * as was done in final_release_stor_device() | |
738 | * Note that we cannot set the ext pointer to NULL until | |
739 | * we have drained - to drain the outgoing packets, we need to | |
740 | * allow incoming packets. | |
741 | */ | |
742 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 743 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
744 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
745 | ||
746 | /* Close the channel */ | |
747 | vmbus_close(device->channel); | |
748 | ||
749 | kfree(stor_device); | |
750 | return 0; | |
751 | } | |
752 | ||
c1b3d067 | 753 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
754 | struct hv_storvsc_request *request) |
755 | { | |
756 | struct storvsc_device *stor_device; | |
757 | struct vstor_packet *vstor_packet; | |
758 | int ret = 0; | |
759 | ||
760 | vstor_packet = &request->vstor_packet; | |
761 | stor_device = get_out_stor_device(device); | |
762 | ||
763 | if (!stor_device) | |
764 | return -ENODEV; | |
765 | ||
766 | ||
767 | request->device = device; | |
768 | ||
769 | ||
770 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
771 | ||
772 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
773 | ||
774 | ||
775 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
776 | ||
777 | ||
778 | vstor_packet->vm_srb.data_transfer_length = | |
779 | request->data_buffer.len; | |
780 | ||
781 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
782 | ||
783 | if (request->data_buffer.len) { | |
784 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
785 | &request->data_buffer, | |
786 | vstor_packet, | |
787 | sizeof(struct vstor_packet), | |
788 | (unsigned long)request); | |
789 | } else { | |
790 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
791 | sizeof(struct vstor_packet), | |
792 | (unsigned long)request, | |
793 | VM_PKT_DATA_INBAND, | |
794 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
795 | } | |
796 | ||
797 | if (ret != 0) | |
798 | return ret; | |
799 | ||
800 | atomic_inc(&stor_device->num_outstanding_req); | |
801 | ||
802 | return ret; | |
803 | } | |
804 | ||
5b60acee S |
805 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
806 | { | |
ce3e301c S |
807 | struct stor_mem_pools *memp; |
808 | int number = STORVSC_MIN_BUF_NR; | |
809 | ||
810 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
811 | if (!memp) | |
812 | return -ENOMEM; | |
813 | ||
814 | memp->request_pool = | |
815 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
816 | sizeof(struct storvsc_cmd_request), 0, | |
817 | SLAB_HWCACHE_ALIGN, NULL); | |
818 | ||
819 | if (!memp->request_pool) | |
820 | goto err0; | |
821 | ||
822 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
823 | mempool_free_slab, | |
824 | memp->request_pool); | |
825 | ||
826 | if (!memp->request_mempool) | |
827 | goto err1; | |
828 | ||
829 | sdevice->hostdata = memp; | |
830 | ||
5b60acee | 831 | return 0; |
ce3e301c S |
832 | |
833 | err1: | |
834 | kmem_cache_destroy(memp->request_pool); | |
835 | ||
836 | err0: | |
837 | kfree(memp); | |
838 | return -ENOMEM; | |
839 | } | |
840 | ||
841 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
842 | { | |
843 | struct stor_mem_pools *memp = sdevice->hostdata; | |
844 | ||
845 | mempool_destroy(memp->request_mempool); | |
846 | kmem_cache_destroy(memp->request_pool); | |
847 | kfree(memp); | |
848 | sdevice->hostdata = NULL; | |
5b60acee S |
849 | } |
850 | ||
419f2d03 S |
851 | static int storvsc_device_configure(struct scsi_device *sdevice) |
852 | { | |
853 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
854 | STORVSC_MAX_IO_REQUESTS); | |
855 | ||
419f2d03 S |
856 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
857 | ||
419f2d03 | 858 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 S |
859 | |
860 | return 0; | |
861 | } | |
862 | ||
49a3c7a9 S |
863 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
864 | unsigned int sg_count) | |
865 | { | |
866 | int i; | |
867 | struct page *page_buf; | |
868 | ||
869 | for (i = 0; i < sg_count; i++) { | |
870 | page_buf = sg_page((&sgl[i])); | |
871 | if (page_buf != NULL) | |
872 | __free_page(page_buf); | |
873 | } | |
874 | ||
875 | kfree(sgl); | |
876 | } | |
877 | ||
3862ef3e S |
878 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
879 | { | |
880 | int i; | |
881 | ||
882 | /* No need to check */ | |
883 | if (sg_count < 2) | |
884 | return -1; | |
885 | ||
886 | /* We have at least 2 sg entries */ | |
887 | for (i = 0; i < sg_count; i++) { | |
888 | if (i == 0) { | |
889 | /* make sure 1st one does not have hole */ | |
890 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
891 | return i; | |
892 | } else if (i == sg_count - 1) { | |
893 | /* make sure last one does not have hole */ | |
894 | if (sgl[i].offset != 0) | |
895 | return i; | |
896 | } else { | |
897 | /* make sure no hole in the middle */ | |
898 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
899 | return i; | |
900 | } | |
901 | } | |
902 | return -1; | |
903 | } | |
904 | ||
a9753cbd S |
905 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
906 | unsigned int sg_count, | |
6e8087a4 S |
907 | unsigned int len, |
908 | int write) | |
a9753cbd S |
909 | { |
910 | int i; | |
911 | int num_pages; | |
912 | struct scatterlist *bounce_sgl; | |
913 | struct page *page_buf; | |
6e8087a4 | 914 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); |
a9753cbd S |
915 | |
916 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
917 | ||
918 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
919 | if (!bounce_sgl) | |
920 | return NULL; | |
921 | ||
922 | for (i = 0; i < num_pages; i++) { | |
923 | page_buf = alloc_page(GFP_ATOMIC); | |
924 | if (!page_buf) | |
925 | goto cleanup; | |
6e8087a4 | 926 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); |
a9753cbd S |
927 | } |
928 | ||
929 | return bounce_sgl; | |
930 | ||
931 | cleanup: | |
932 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
933 | return NULL; | |
934 | } | |
935 | ||
29fe2c9b S |
936 | |
937 | /* Assume the original sgl has enough room */ | |
938 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
939 | struct scatterlist *bounce_sgl, | |
10c43dd4 S |
940 | unsigned int orig_sgl_count, |
941 | unsigned int bounce_sgl_count) | |
29fe2c9b S |
942 | { |
943 | int i; | |
944 | int j = 0; | |
945 | unsigned long src, dest; | |
946 | unsigned int srclen, destlen, copylen; | |
947 | unsigned int total_copied = 0; | |
948 | unsigned long bounce_addr = 0; | |
949 | unsigned long dest_addr = 0; | |
950 | unsigned long flags; | |
951 | ||
952 | local_irq_save(flags); | |
953 | ||
954 | for (i = 0; i < orig_sgl_count; i++) { | |
955 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
956 | KM_IRQ0) + orig_sgl[i].offset; | |
957 | dest = dest_addr; | |
958 | destlen = orig_sgl[i].length; | |
959 | ||
960 | if (bounce_addr == 0) | |
961 | bounce_addr = | |
962 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
963 | KM_IRQ0); | |
964 | ||
965 | while (destlen) { | |
966 | src = bounce_addr + bounce_sgl[j].offset; | |
967 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
968 | ||
969 | copylen = min(srclen, destlen); | |
970 | memcpy((void *)dest, (void *)src, copylen); | |
971 | ||
972 | total_copied += copylen; | |
973 | bounce_sgl[j].offset += copylen; | |
974 | destlen -= copylen; | |
975 | dest += copylen; | |
976 | ||
977 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
978 | /* full */ | |
979 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
980 | j++; | |
981 | ||
10c43dd4 S |
982 | /* |
983 | * It is possible that the number of elements | |
984 | * in the bounce buffer may not be equal to | |
985 | * the number of elements in the original | |
986 | * scatter list. Handle this correctly. | |
987 | */ | |
988 | ||
989 | if (j == bounce_sgl_count) { | |
990 | /* | |
991 | * We are done; cleanup and return. | |
992 | */ | |
993 | kunmap_atomic((void *)(dest_addr - | |
994 | orig_sgl[i].offset), | |
995 | KM_IRQ0); | |
996 | local_irq_restore(flags); | |
997 | return total_copied; | |
998 | } | |
999 | ||
29fe2c9b S |
1000 | /* if we need to use another bounce buffer */ |
1001 | if (destlen || i != orig_sgl_count - 1) | |
1002 | bounce_addr = | |
1003 | (unsigned long)kmap_atomic( | |
1004 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
1005 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
1006 | /* unmap the last bounce that is < PAGE_SIZE */ | |
1007 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
1012 | KM_IRQ0); | |
1013 | } | |
1014 | ||
1015 | local_irq_restore(flags); | |
1016 | ||
1017 | return total_copied; | |
1018 | } | |
1019 | ||
6a8ff44b S |
1020 | |
1021 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
1022 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
1023 | struct scatterlist *bounce_sgl, | |
1024 | unsigned int orig_sgl_count) | |
1025 | { | |
1026 | int i; | |
1027 | int j = 0; | |
1028 | unsigned long src, dest; | |
1029 | unsigned int srclen, destlen, copylen; | |
1030 | unsigned int total_copied = 0; | |
1031 | unsigned long bounce_addr = 0; | |
1032 | unsigned long src_addr = 0; | |
1033 | unsigned long flags; | |
1034 | ||
1035 | local_irq_save(flags); | |
1036 | ||
1037 | for (i = 0; i < orig_sgl_count; i++) { | |
1038 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
1039 | KM_IRQ0) + orig_sgl[i].offset; | |
1040 | src = src_addr; | |
1041 | srclen = orig_sgl[i].length; | |
1042 | ||
1043 | if (bounce_addr == 0) | |
1044 | bounce_addr = | |
1045 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
1046 | KM_IRQ0); | |
1047 | ||
1048 | while (srclen) { | |
1049 | /* assume bounce offset always == 0 */ | |
1050 | dest = bounce_addr + bounce_sgl[j].length; | |
1051 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
1052 | ||
1053 | copylen = min(srclen, destlen); | |
1054 | memcpy((void *)dest, (void *)src, copylen); | |
1055 | ||
1056 | total_copied += copylen; | |
1057 | bounce_sgl[j].length += copylen; | |
1058 | srclen -= copylen; | |
1059 | src += copylen; | |
1060 | ||
1061 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
1062 | /* full..move to next entry */ | |
1063 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1064 | j++; | |
1065 | ||
1066 | /* if we need to use another bounce buffer */ | |
1067 | if (srclen || i != orig_sgl_count - 1) | |
1068 | bounce_addr = | |
1069 | (unsigned long)kmap_atomic( | |
1070 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
1071 | ||
1072 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
1073 | /* unmap the last bounce that is < PAGE_SIZE */ | |
1074 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
1079 | } | |
1080 | ||
1081 | local_irq_restore(flags); | |
1082 | ||
1083 | return total_copied; | |
1084 | } | |
1085 | ||
5c5c0234 | 1086 | |
5c5c0234 S |
1087 | static int storvsc_remove(struct hv_device *dev) |
1088 | { | |
cd654ea1 S |
1089 | struct storvsc_device *stor_device = hv_get_drvdata(dev); |
1090 | struct Scsi_Host *host = stor_device->host; | |
5c5c0234 | 1091 | |
2935a407 S |
1092 | scsi_remove_host(host); |
1093 | ||
2935a407 | 1094 | scsi_host_put(host); |
d36b0a03 | 1095 | |
6cdc57c0 | 1096 | storvsc_dev_remove(dev); |
ce3e301c | 1097 | |
5c5c0234 S |
1098 | return 0; |
1099 | } | |
1100 | ||
62838ce2 S |
1101 | |
1102 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
1103 | sector_t capacity, int *info) | |
1104 | { | |
5326fd5c S |
1105 | sector_t nsect = capacity; |
1106 | sector_t cylinders = nsect; | |
1107 | int heads, sectors_pt; | |
62838ce2 | 1108 | |
5326fd5c S |
1109 | /* |
1110 | * We are making up these values; let us keep it simple. | |
1111 | */ | |
1112 | heads = 0xff; | |
1113 | sectors_pt = 0x3f; /* Sectors per track */ | |
1114 | sector_div(cylinders, heads * sectors_pt); | |
1115 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1116 | cylinders = 0xffff; | |
62838ce2 S |
1117 | |
1118 | info[0] = heads; | |
5326fd5c S |
1119 | info[1] = sectors_pt; |
1120 | info[2] = (int)cylinders; | |
62838ce2 | 1121 | |
62838ce2 S |
1122 | return 0; |
1123 | } | |
aa3d789e S |
1124 | |
1125 | static int storvsc_host_reset(struct hv_device *device) | |
1126 | { | |
1127 | struct storvsc_device *stor_device; | |
1128 | struct hv_storvsc_request *request; | |
1129 | struct vstor_packet *vstor_packet; | |
1130 | int ret, t; | |
1131 | ||
aa3d789e | 1132 | |
1eaaddf9 | 1133 | stor_device = get_out_stor_device(device); |
aa3d789e | 1134 | if (!stor_device) |
a00e8224 | 1135 | return FAILED; |
aa3d789e S |
1136 | |
1137 | request = &stor_device->reset_request; | |
1138 | vstor_packet = &request->vstor_packet; | |
1139 | ||
1140 | init_completion(&request->wait_event); | |
1141 | ||
1142 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1143 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1144 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1145 | ||
1146 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1147 | sizeof(struct vstor_packet), | |
1148 | (unsigned long)&stor_device->reset_request, | |
1149 | VM_PKT_DATA_INBAND, | |
1150 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1151 | if (ret != 0) | |
a00e8224 | 1152 | return FAILED; |
aa3d789e | 1153 | |
46d2eb6d | 1154 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1155 | if (t == 0) |
1156 | return TIMEOUT_ERROR; | |
aa3d789e | 1157 | |
aa3d789e S |
1158 | |
1159 | /* | |
1160 | * At this point, all outstanding requests in the adapter | |
1161 | * should have been flushed out and return to us | |
1162 | */ | |
1163 | ||
a00e8224 | 1164 | return SUCCESS; |
aa3d789e S |
1165 | } |
1166 | ||
1167 | ||
96e690be S |
1168 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
1169 | { | |
7f33f30a | 1170 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
96e690be S |
1171 | struct hv_device *dev = host_dev->dev; |
1172 | ||
a00e8224 | 1173 | return storvsc_host_reset(dev); |
96e690be S |
1174 | } |
1175 | ||
8a411bad | 1176 | |
b8de73df | 1177 | static void storvsc_command_completion(struct hv_storvsc_request *request) |
8a411bad S |
1178 | { |
1179 | struct storvsc_cmd_request *cmd_request = | |
1180 | (struct storvsc_cmd_request *)request->context; | |
1181 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
7f33f30a | 1182 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
8a411bad S |
1183 | void (*scsi_done_fn)(struct scsi_cmnd *); |
1184 | struct scsi_sense_hdr sense_hdr; | |
1185 | struct vmscsi_request *vm_srb; | |
b4017319 | 1186 | struct storvsc_scan_work *wrk; |
ce3e301c | 1187 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
8a411bad | 1188 | |
3612ef99 | 1189 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1190 | if (cmd_request->bounce_sgl_count) { |
a768a76d | 1191 | if (vm_srb->data_in == READ_TYPE) |
3612ef99 | 1192 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
8a411bad | 1193 | cmd_request->bounce_sgl, |
10c43dd4 S |
1194 | scsi_sg_count(scmnd), |
1195 | cmd_request->bounce_sgl_count); | |
a768a76d | 1196 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
3612ef99 | 1197 | cmd_request->bounce_sgl_count); |
8a411bad S |
1198 | } |
1199 | ||
2544b794 S |
1200 | /* |
1201 | * If there is an error; offline the device since all | |
1202 | * error recovery strategies would have already been | |
1203 | * deployed on the host side. | |
1204 | */ | |
16046320 | 1205 | if (vm_srb->srb_status == SRB_STATUS_ERROR) |
2544b794 S |
1206 | scmnd->result = DID_TARGET_FAILURE << 16; |
1207 | else | |
1208 | scmnd->result = vm_srb->scsi_status; | |
8a411bad | 1209 | |
b4017319 S |
1210 | /* |
1211 | * If the LUN is invalid; remove the device. | |
1212 | */ | |
16046320 | 1213 | if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { |
b4017319 S |
1214 | struct storvsc_device *stor_dev; |
1215 | struct hv_device *dev = host_dev->dev; | |
1216 | struct Scsi_Host *host; | |
1217 | ||
1218 | stor_dev = get_in_stor_device(dev); | |
1219 | host = stor_dev->host; | |
1220 | ||
1221 | wrk = kmalloc(sizeof(struct storvsc_scan_work), | |
1222 | GFP_ATOMIC); | |
1223 | if (!wrk) { | |
1224 | scmnd->result = DID_TARGET_FAILURE << 16; | |
1225 | } else { | |
1226 | wrk->host = host; | |
1227 | wrk->lun = vm_srb->lun; | |
1228 | INIT_WORK(&wrk->work, storvsc_remove_lun); | |
1229 | schedule_work(&wrk->work); | |
1230 | } | |
1231 | } | |
1232 | ||
8a411bad S |
1233 | if (scmnd->result) { |
1234 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1235 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1236 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1237 | } | |
1238 | ||
8a411bad S |
1239 | scsi_set_resid(scmnd, |
1240 | request->data_buffer.len - | |
1241 | vm_srb->data_transfer_length); | |
1242 | ||
1243 | scsi_done_fn = scmnd->scsi_done; | |
1244 | ||
1245 | scmnd->host_scribble = NULL; | |
1246 | scmnd->scsi_done = NULL; | |
1247 | ||
8a411bad S |
1248 | scsi_done_fn(scmnd); |
1249 | ||
ce3e301c | 1250 | mempool_free(cmd_request, memp->request_mempool); |
8a411bad S |
1251 | } |
1252 | ||
c77b63b6 | 1253 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1254 | { |
1255 | bool allowed = true; | |
1256 | u8 scsi_op = scmnd->cmnd[0]; | |
1257 | ||
1258 | switch (scsi_op) { | |
c77b63b6 S |
1259 | /* |
1260 | * smartd sends this command and the host does not handle | |
1261 | * this. So, don't send it. | |
1262 | */ | |
41098f8f | 1263 | case SET_WINDOW: |
59e00e74 | 1264 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1265 | allowed = false; |
1266 | break; | |
1267 | default: | |
1268 | break; | |
92ae4ebd OH |
1269 | } |
1270 | return allowed; | |
1271 | } | |
c5b463ae | 1272 | |
bab445e1 | 1273 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1274 | { |
1275 | int ret; | |
bab445e1 | 1276 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1277 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1278 | struct hv_storvsc_request *request; |
1279 | struct storvsc_cmd_request *cmd_request; | |
1280 | unsigned int request_size = 0; | |
1281 | int i; | |
1282 | struct scatterlist *sgl; | |
1283 | unsigned int sg_count = 0; | |
1284 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1285 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1286 | |
c77b63b6 | 1287 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1288 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1289 | return 0; |
1290 | } | |
c5b463ae | 1291 | |
c5b463ae S |
1292 | request_size = sizeof(struct storvsc_cmd_request); |
1293 | ||
ce3e301c | 1294 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1295 | GFP_ATOMIC); |
c77b63b6 S |
1296 | |
1297 | /* | |
1298 | * We might be invoked in an interrupt context; hence | |
1299 | * mempool_alloc() can fail. | |
1300 | */ | |
bab445e1 | 1301 | if (!cmd_request) |
c5b463ae | 1302 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1303 | |
4e03e697 | 1304 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1305 | |
1306 | /* Setup the cmd request */ | |
c5b463ae S |
1307 | cmd_request->cmd = scmnd; |
1308 | ||
1309 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1310 | ||
1311 | request = &cmd_request->request; | |
1312 | vm_srb = &request->vstor_packet.vm_srb; | |
1313 | ||
1314 | ||
1315 | /* Build the SRB */ | |
1316 | switch (scmnd->sc_data_direction) { | |
1317 | case DMA_TO_DEVICE: | |
1318 | vm_srb->data_in = WRITE_TYPE; | |
1319 | break; | |
1320 | case DMA_FROM_DEVICE: | |
1321 | vm_srb->data_in = READ_TYPE; | |
1322 | break; | |
1323 | default: | |
1324 | vm_srb->data_in = UNKNOWN_TYPE; | |
1325 | break; | |
1326 | } | |
1327 | ||
b8de73df | 1328 | request->on_io_completion = storvsc_command_completion; |
c5b463ae S |
1329 | request->context = cmd_request;/* scmnd; */ |
1330 | ||
c5b463ae S |
1331 | vm_srb->port_number = host_dev->port; |
1332 | vm_srb->path_id = scmnd->device->channel; | |
1333 | vm_srb->target_id = scmnd->device->id; | |
1334 | vm_srb->lun = scmnd->device->lun; | |
1335 | ||
c5b463ae S |
1336 | vm_srb->cdb_length = scmnd->cmd_len; |
1337 | ||
1338 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1339 | ||
1340 | request->sense_buffer = scmnd->sense_buffer; | |
1341 | ||
1342 | ||
1343 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1344 | if (scsi_sg_count(scmnd)) { | |
1345 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1346 | sg_count = scsi_sg_count(scmnd); | |
1347 | ||
1348 | /* check if we need to bounce the sgl */ | |
1349 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1350 | cmd_request->bounce_sgl = | |
1351 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1352 | scsi_bufflen(scmnd), |
1353 | vm_srb->data_in); | |
c5b463ae | 1354 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1355 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1356 | goto queue_error; | |
c5b463ae S |
1357 | } |
1358 | ||
1359 | cmd_request->bounce_sgl_count = | |
1360 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1361 | PAGE_SHIFT; | |
1362 | ||
fa23b8c7 S |
1363 | if (vm_srb->data_in == WRITE_TYPE) |
1364 | copy_to_bounce_buffer(sgl, | |
1365 | cmd_request->bounce_sgl, | |
1366 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1367 | |
1368 | sgl = cmd_request->bounce_sgl; | |
1369 | sg_count = cmd_request->bounce_sgl_count; | |
1370 | } | |
1371 | ||
1372 | request->data_buffer.offset = sgl[0].offset; | |
1373 | ||
1374 | for (i = 0; i < sg_count; i++) | |
1375 | request->data_buffer.pfn_array[i] = | |
1376 | page_to_pfn(sg_page((&sgl[i]))); | |
1377 | ||
1378 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1379 | request->data_buffer.offset = |
1380 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1381 | request->data_buffer.pfn_array[0] = | |
1382 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1383 | } | |
1384 | ||
c5b463ae | 1385 | /* Invokes the vsc to start an IO */ |
636f0fd1 S |
1386 | ret = storvsc_do_io(dev, &cmd_request->request); |
1387 | ||
d2598f01 | 1388 | if (ret == -EAGAIN) { |
c5b463ae S |
1389 | /* no more space */ |
1390 | ||
c77b63b6 | 1391 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1392 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1393 | cmd_request->bounce_sgl_count); |
c5b463ae | 1394 | |
c77b63b6 S |
1395 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1396 | goto queue_error; | |
1397 | } | |
c5b463ae S |
1398 | } |
1399 | ||
c77b63b6 S |
1400 | return 0; |
1401 | ||
1402 | queue_error: | |
1403 | mempool_free(cmd_request, memp->request_mempool); | |
1404 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1405 | return ret; |
1406 | } | |
1407 | ||
bef4a34a | 1408 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1409 | .module = THIS_MODULE, |
1410 | .name = "storvsc_host_t", | |
1411 | .bios_param = storvsc_get_chs, | |
1412 | .queuecommand = storvsc_queuecommand, | |
1413 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1414 | .slave_alloc = storvsc_device_alloc, | |
ce3e301c | 1415 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1416 | .slave_configure = storvsc_device_configure, |
1417 | .cmd_per_lun = 1, | |
1418 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1419 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1420 | .this_id = -1, |
454f18a9 | 1421 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1422 | /* currently 32 */ |
1423 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1424 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1425 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1426 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1427 | }; |
1428 | ||
ef52a81b S |
1429 | enum { |
1430 | SCSI_GUID, | |
1431 | IDE_GUID, | |
1432 | }; | |
1433 | ||
d847b5fe | 1434 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1435 | /* SCSI guid */ |
1436 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1437 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1438 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1439 | /* IDE guid */ |
1440 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1441 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1442 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1443 | { }, |
d847b5fe | 1444 | }; |
bef4a34a | 1445 | |
d847b5fe | 1446 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1447 | |
84946899 S |
1448 | static int storvsc_probe(struct hv_device *device, |
1449 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1450 | { |
ff568d3a | 1451 | int ret; |
bef4a34a | 1452 | struct Scsi_Host *host; |
795b613d | 1453 | struct hv_host_device *host_dev; |
ef52a81b | 1454 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1455 | int target = 0; |
6e4198ce | 1456 | struct storvsc_device *stor_device; |
bd1f5d6a | 1457 | |
ff568d3a | 1458 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1459 | sizeof(struct hv_host_device)); |
f8feed06 | 1460 | if (!host) |
bef4a34a | 1461 | return -ENOMEM; |
bef4a34a | 1462 | |
7f33f30a | 1463 | host_dev = shost_priv(host); |
795b613d | 1464 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1465 | |
795b613d | 1466 | host_dev->port = host->host_no; |
97c15296 | 1467 | host_dev->dev = device; |
bef4a34a | 1468 | |
4e03e697 | 1469 | |
a13d35ab | 1470 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1471 | if (!stor_device) { |
225ce6ea | 1472 | ret = -ENOMEM; |
ce3e301c | 1473 | goto err_out0; |
6e4198ce | 1474 | } |
9efd21e1 | 1475 | |
a13d35ab S |
1476 | stor_device->destroy = false; |
1477 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1478 | stor_device->device = device; | |
cd654ea1 S |
1479 | stor_device->host = host; |
1480 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1481 | |
6e4198ce S |
1482 | stor_device->port_number = host->host_no; |
1483 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1484 | if (ret) |
ce3e301c | 1485 | goto err_out1; |
bef4a34a | 1486 | |
6e4198ce S |
1487 | host_dev->path = stor_device->path_id; |
1488 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1489 | |
ff568d3a GKH |
1490 | /* max # of devices per target */ |
1491 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1492 | /* max # of targets per channel */ | |
1493 | host->max_id = STORVSC_MAX_TARGETS; | |
1494 | /* max # of channels */ | |
1495 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1496 | /* max cmd length */ |
1497 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1498 | |
454f18a9 | 1499 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1500 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1501 | if (ret != 0) |
ce3e301c | 1502 | goto err_out2; |
bef4a34a | 1503 | |
bd1f5d6a S |
1504 | if (!dev_is_ide) { |
1505 | scsi_scan_host(host); | |
59d22950 S |
1506 | } else { |
1507 | target = (device->dev_instance.b[5] << 8 | | |
1508 | device->dev_instance.b[4]); | |
1509 | ret = scsi_add_device(host, 0, target, 0); | |
1510 | if (ret) { | |
1511 | scsi_remove_host(host); | |
1512 | goto err_out2; | |
1513 | } | |
bef4a34a | 1514 | } |
bd1f5d6a | 1515 | return 0; |
bef4a34a | 1516 | |
ce3e301c | 1517 | err_out2: |
225ce6ea S |
1518 | /* |
1519 | * Once we have connected with the host, we would need to | |
1520 | * to invoke storvsc_dev_remove() to rollback this state and | |
1521 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1522 | * err_out1 label. |
225ce6ea | 1523 | */ |
bd1f5d6a | 1524 | storvsc_dev_remove(device); |
ce3e301c | 1525 | goto err_out0; |
225ce6ea S |
1526 | |
1527 | err_out1: | |
ce3e301c | 1528 | kfree(stor_device); |
225ce6ea S |
1529 | |
1530 | err_out0: | |
bd1f5d6a | 1531 | scsi_host_put(host); |
225ce6ea | 1532 | return ret; |
bef4a34a HJ |
1533 | } |
1534 | ||
40bf63ed | 1535 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1536 | .name = KBUILD_MODNAME, |
d847b5fe | 1537 | .id_table = id_table, |
40bf63ed S |
1538 | .probe = storvsc_probe, |
1539 | .remove = storvsc_remove, | |
39ae6fae | 1540 | }; |
7bd05b91 | 1541 | |
d9bbae83 | 1542 | static int __init storvsc_drv_init(void) |
f5c78872 | 1543 | { |
01415ab3 S |
1544 | u32 max_outstanding_req_per_channel; |
1545 | ||
1546 | /* | |
1547 | * Divide the ring buffer data size (which is 1 page less | |
1548 | * than the ring buffer size since that page is reserved for | |
1549 | * the ring buffer indices) by the max request size (which is | |
1550 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1551 | */ | |
01415ab3 | 1552 | max_outstanding_req_per_channel = |
768fa219 GKH |
1553 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1554 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1555 | sizeof(struct vstor_packet) + sizeof(u64), | |
1556 | sizeof(u64))); | |
f5c78872 | 1557 | |
01415ab3 | 1558 | if (max_outstanding_req_per_channel < |
f5c78872 | 1559 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1560 | return -EINVAL; |
f5c78872 | 1561 | |
768fa219 | 1562 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1563 | } |
1564 | ||
c63ba9e1 | 1565 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1566 | { |
768fa219 | 1567 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1568 | } |
1569 | ||
ff568d3a | 1570 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1571 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1572 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1573 | module_init(storvsc_drv_init); |
c63ba9e1 | 1574 | module_exit(storvsc_drv_exit); |