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 | ||
f0d79fe9 S |
53 | /* to alert the user that structure sizes may be mismatched even though the */ |
54 | /* protocol versions match. */ | |
55 | ||
56 | ||
57 | #define REVISION_STRING(REVISION_) #REVISION_ | |
58 | #define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \ | |
59 | do { \ | |
60 | char *revision_string \ | |
61 | = REVISION_STRING($Rev : 6 $) + 6; \ | |
62 | RESULT_LVALUE_ = 0; \ | |
63 | while (*revision_string >= '0' \ | |
64 | && *revision_string <= '9') { \ | |
65 | RESULT_LVALUE_ *= 10; \ | |
66 | RESULT_LVALUE_ += *revision_string - '0'; \ | |
67 | revision_string++; \ | |
68 | } \ | |
69 | } while (0) | |
70 | ||
71 | /* Major/minor macros. Minor version is in LSB, meaning that earlier flat */ | |
72 | /* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */ | |
73 | #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) | |
74 | #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) | |
75 | #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ | |
76 | (((MINOR_) & 0xff))) | |
77 | #define VMSTOR_INVALID_PROTOCOL_VERSION (-1) | |
78 | ||
79 | /* Version history: */ | |
80 | /* V1 Beta 0.1 */ | |
81 | /* V1 RC < 2008/1/31 1.0 */ | |
82 | /* V1 RC > 2008/1/31 2.0 */ | |
2b9525f5 | 83 | #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2) |
f0d79fe9 S |
84 | |
85 | ||
86 | ||
87 | ||
88 | /* This will get replaced with the max transfer length that is possible on */ | |
89 | /* the host adapter. */ | |
90 | /* The max transfer length will be published when we offer a vmbus channel. */ | |
91 | #define MAX_TRANSFER_LENGTH 0x40000 | |
92 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
93 | sizeof(struct vstor_packet) + \ | |
94 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
95 | ||
96 | ||
97 | /* Packet structure describing virtual storage requests. */ | |
98 | enum vstor_packet_operation { | |
99 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
100 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
101 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
102 | VSTOR_OPERATION_RESET_LUN = 4, | |
103 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
104 | VSTOR_OPERATION_RESET_BUS = 6, | |
105 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
106 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
107 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
108 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
109 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
110 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
111 | }; |
112 | ||
113 | /* | |
114 | * Platform neutral description of a scsi request - | |
115 | * this remains the same across the write regardless of 32/64 bit | |
116 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
117 | */ | |
118 | #define CDB16GENERIC_LENGTH 0x10 | |
119 | ||
120 | #ifndef SENSE_BUFFER_SIZE | |
121 | #define SENSE_BUFFER_SIZE 0x12 | |
122 | #endif | |
123 | ||
124 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
125 | ||
126 | struct vmscsi_request { | |
127 | unsigned short length; | |
128 | unsigned char srb_status; | |
129 | unsigned char scsi_status; | |
130 | ||
131 | unsigned char port_number; | |
132 | unsigned char path_id; | |
133 | unsigned char target_id; | |
134 | unsigned char lun; | |
135 | ||
136 | unsigned char cdb_length; | |
137 | unsigned char sense_info_length; | |
138 | unsigned char data_in; | |
139 | unsigned char reserved; | |
140 | ||
141 | unsigned int data_transfer_length; | |
142 | ||
143 | union { | |
144 | unsigned char cdb[CDB16GENERIC_LENGTH]; | |
145 | unsigned char sense_data[SENSE_BUFFER_SIZE]; | |
146 | unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
147 | }; | |
148 | } __attribute((packed)); | |
149 | ||
150 | ||
151 | /* | |
152 | * This structure is sent during the intialization phase to get the different | |
153 | * properties of the channel. | |
154 | */ | |
155 | struct vmstorage_channel_properties { | |
156 | unsigned short protocol_version; | |
157 | unsigned char path_id; | |
158 | unsigned char target_id; | |
159 | ||
160 | /* Note: port number is only really known on the client side */ | |
161 | unsigned int port_number; | |
162 | unsigned int flags; | |
163 | unsigned int max_transfer_bytes; | |
164 | ||
165 | /* This id is unique for each channel and will correspond with */ | |
166 | /* vendor specific data in the inquirydata */ | |
167 | unsigned long long unique_id; | |
168 | } __packed; | |
169 | ||
170 | /* This structure is sent during the storage protocol negotiations. */ | |
171 | struct vmstorage_protocol_version { | |
172 | /* Major (MSW) and minor (LSW) version numbers. */ | |
173 | unsigned short major_minor; | |
174 | ||
175 | /* | |
176 | * Revision number is auto-incremented whenever this file is changed | |
177 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
178 | * definitely indicate incompatibility--but it does indicate mismatched | |
179 | * builds. | |
180 | */ | |
181 | unsigned short revision; | |
182 | } __packed; | |
183 | ||
184 | /* Channel Property Flags */ | |
185 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
186 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
187 | ||
188 | struct vstor_packet { | |
189 | /* Requested operation type */ | |
190 | enum vstor_packet_operation operation; | |
191 | ||
192 | /* Flags - see below for values */ | |
193 | unsigned int flags; | |
194 | ||
195 | /* Status of the request returned from the server side. */ | |
196 | unsigned int status; | |
197 | ||
198 | /* Data payload area */ | |
199 | union { | |
200 | /* | |
201 | * Structure used to forward SCSI commands from the | |
202 | * client to the server. | |
203 | */ | |
204 | struct vmscsi_request vm_srb; | |
205 | ||
206 | /* Structure used to query channel properties. */ | |
207 | struct vmstorage_channel_properties storage_channel_properties; | |
208 | ||
209 | /* Used during version negotiations. */ | |
210 | struct vmstorage_protocol_version version; | |
211 | }; | |
212 | } __packed; | |
213 | ||
214 | /* Packet flags */ | |
215 | /* | |
216 | * This flag indicates that the server should send back a completion for this | |
217 | * packet. | |
218 | */ | |
219 | #define REQUEST_COMPLETION_FLAG 0x1 | |
220 | ||
221 | /* This is the set of flags that the vsc can set in any packets it sends */ | |
222 | #define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG) | |
223 | ||
224 | ||
225 | /* Defines */ | |
f0d79fe9 S |
226 | |
227 | #define STORVSC_MAX_IO_REQUESTS 128 | |
228 | ||
229 | /* | |
230 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
231 | * reality, the path/target is not used (ie always set to 0) so our | |
232 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
233 | * up to 256 luns. | |
234 | */ | |
235 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
236 | #define STORVSC_MAX_TARGETS 1 | |
237 | #define STORVSC_MAX_CHANNELS 1 | |
cf55f4a8 | 238 | #define STORVSC_MAX_CMD_LEN 16 |
f0d79fe9 | 239 | |
f0d79fe9 S |
240 | /* Matches Windows-end */ |
241 | enum storvsc_request_type { | |
242 | WRITE_TYPE, | |
243 | READ_TYPE, | |
244 | UNKNOWN_TYPE, | |
245 | }; | |
246 | ||
247 | ||
248 | struct hv_storvsc_request { | |
f0d79fe9 S |
249 | struct hv_device *device; |
250 | ||
251 | /* Synchronize the request/response if needed */ | |
252 | struct completion wait_event; | |
253 | ||
254 | unsigned char *sense_buffer; | |
255 | void *context; | |
256 | void (*on_io_completion)(struct hv_storvsc_request *request); | |
257 | struct hv_multipage_buffer data_buffer; | |
258 | ||
259 | struct vstor_packet vstor_packet; | |
260 | }; | |
261 | ||
262 | ||
f0d79fe9 S |
263 | /* A storvsc device is a device object that contains a vmbus channel */ |
264 | struct storvsc_device { | |
265 | struct hv_device *device; | |
266 | ||
267 | bool destroy; | |
268 | bool drain_notify; | |
269 | atomic_t num_outstanding_req; | |
cd654ea1 | 270 | struct Scsi_Host *host; |
f0d79fe9 S |
271 | |
272 | wait_queue_head_t waiting_to_drain; | |
273 | ||
274 | /* | |
275 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
276 | * controller. In reality, the pathid, targetid is always 0 | |
277 | * and the port is set by us | |
278 | */ | |
279 | unsigned int port_number; | |
280 | unsigned char path_id; | |
281 | unsigned char target_id; | |
282 | ||
283 | /* Used for vsc/vsp channel reset process */ | |
284 | struct hv_storvsc_request init_request; | |
285 | struct hv_storvsc_request reset_request; | |
286 | }; | |
287 | ||
c1b3d067 S |
288 | struct hv_host_device { |
289 | struct hv_device *dev; | |
290 | struct kmem_cache *request_pool; | |
4e03e697 | 291 | mempool_t *request_mempool; |
c1b3d067 S |
292 | unsigned int port; |
293 | unsigned char path; | |
294 | unsigned char target; | |
295 | }; | |
296 | ||
297 | struct storvsc_cmd_request { | |
298 | struct list_head entry; | |
299 | struct scsi_cmnd *cmd; | |
300 | ||
301 | unsigned int bounce_sgl_count; | |
302 | struct scatterlist *bounce_sgl; | |
303 | ||
304 | struct hv_storvsc_request request; | |
305 | }; | |
f0d79fe9 S |
306 | |
307 | static inline struct storvsc_device *get_out_stor_device( | |
308 | struct hv_device *device) | |
309 | { | |
310 | struct storvsc_device *stor_device; | |
311 | ||
cd654ea1 | 312 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
313 | |
314 | if (stor_device && stor_device->destroy) | |
315 | stor_device = NULL; | |
316 | ||
317 | return stor_device; | |
318 | } | |
319 | ||
320 | ||
321 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
322 | { | |
323 | dev->drain_notify = true; | |
324 | wait_event(dev->waiting_to_drain, | |
325 | atomic_read(&dev->num_outstanding_req) == 0); | |
326 | dev->drain_notify = false; | |
327 | } | |
bef4a34a | 328 | |
8dcf37d4 S |
329 | static inline struct storvsc_device *get_in_stor_device( |
330 | struct hv_device *device) | |
331 | { | |
332 | struct storvsc_device *stor_device; | |
8dcf37d4 | 333 | |
cd654ea1 | 334 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
335 | |
336 | if (!stor_device) | |
337 | goto get_in_err; | |
338 | ||
339 | /* | |
340 | * If the device is being destroyed; allow incoming | |
341 | * traffic only to cleanup outstanding requests. | |
342 | */ | |
343 | ||
344 | if (stor_device->destroy && | |
345 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
346 | stor_device = NULL; | |
347 | ||
348 | get_in_err: | |
8dcf37d4 S |
349 | return stor_device; |
350 | ||
351 | } | |
352 | ||
353 | static int storvsc_channel_init(struct hv_device *device) | |
354 | { | |
355 | struct storvsc_device *stor_device; | |
356 | struct hv_storvsc_request *request; | |
357 | struct vstor_packet *vstor_packet; | |
358 | int ret, t; | |
359 | ||
360 | stor_device = get_out_stor_device(device); | |
361 | if (!stor_device) | |
362 | return -ENODEV; | |
363 | ||
364 | request = &stor_device->init_request; | |
365 | vstor_packet = &request->vstor_packet; | |
366 | ||
367 | /* | |
368 | * Now, initiate the vsc/vsp initialization protocol on the open | |
369 | * channel | |
370 | */ | |
371 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
372 | init_completion(&request->wait_event); | |
373 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
374 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
375 | ||
376 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
377 | sizeof(struct vstor_packet), | |
378 | (unsigned long)request, | |
379 | VM_PKT_DATA_INBAND, | |
380 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
381 | if (ret != 0) | |
382 | goto cleanup; | |
383 | ||
384 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
385 | if (t == 0) { | |
386 | ret = -ETIMEDOUT; | |
387 | goto cleanup; | |
388 | } | |
389 | ||
390 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
391 | vstor_packet->status != 0) | |
392 | goto cleanup; | |
393 | ||
394 | ||
395 | /* reuse the packet for version range supported */ | |
396 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
397 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
398 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
399 | ||
400 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
401 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
402 | ||
403 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
404 | sizeof(struct vstor_packet), | |
405 | (unsigned long)request, | |
406 | VM_PKT_DATA_INBAND, | |
407 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
408 | if (ret != 0) | |
409 | goto cleanup; | |
410 | ||
411 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
412 | if (t == 0) { | |
413 | ret = -ETIMEDOUT; | |
414 | goto cleanup; | |
415 | } | |
416 | ||
417 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
418 | vstor_packet->status != 0) | |
419 | goto cleanup; | |
420 | ||
421 | ||
422 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
423 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
424 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
425 | vstor_packet->storage_channel_properties.port_number = | |
426 | stor_device->port_number; | |
427 | ||
428 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
429 | sizeof(struct vstor_packet), | |
430 | (unsigned long)request, | |
431 | VM_PKT_DATA_INBAND, | |
432 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
433 | ||
434 | if (ret != 0) | |
435 | goto cleanup; | |
436 | ||
437 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
438 | if (t == 0) { | |
439 | ret = -ETIMEDOUT; | |
440 | goto cleanup; | |
441 | } | |
442 | ||
443 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
444 | vstor_packet->status != 0) | |
445 | goto cleanup; | |
446 | ||
447 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
448 | stor_device->target_id | |
449 | = vstor_packet->storage_channel_properties.target_id; | |
450 | ||
451 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
452 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
453 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
454 | ||
455 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
456 | sizeof(struct vstor_packet), | |
457 | (unsigned long)request, | |
458 | VM_PKT_DATA_INBAND, | |
459 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
460 | ||
461 | if (ret != 0) | |
462 | goto cleanup; | |
463 | ||
464 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
465 | if (t == 0) { | |
466 | ret = -ETIMEDOUT; | |
467 | goto cleanup; | |
468 | } | |
469 | ||
470 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
471 | vstor_packet->status != 0) | |
472 | goto cleanup; | |
473 | ||
474 | ||
475 | cleanup: | |
476 | return ret; | |
477 | } | |
478 | ||
479 | static void storvsc_on_io_completion(struct hv_device *device, | |
480 | struct vstor_packet *vstor_packet, | |
481 | struct hv_storvsc_request *request) | |
482 | { | |
483 | struct storvsc_device *stor_device; | |
484 | struct vstor_packet *stor_pkt; | |
485 | ||
cd654ea1 | 486 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
487 | stor_pkt = &request->vstor_packet; |
488 | ||
4ed51a21 S |
489 | /* |
490 | * The current SCSI handling on the host side does | |
491 | * not correctly handle: | |
492 | * INQUIRY command with page code parameter set to 0x80 | |
493 | * MODE_SENSE command with cmd[2] == 0x1c | |
494 | * | |
495 | * Setup srb and scsi status so this won't be fatal. | |
496 | * We do this so we can distinguish truly fatal failues | |
497 | * (srb status == 0x4) and off-line the device in that case. | |
498 | */ | |
499 | ||
500 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
501 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { | |
502 | vstor_packet->vm_srb.scsi_status = 0; | |
503 | vstor_packet->vm_srb.srb_status = 0x1; | |
504 | } | |
505 | ||
8dcf37d4 S |
506 | |
507 | /* Copy over the status...etc */ | |
508 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
509 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
510 | stor_pkt->vm_srb.sense_info_length = | |
511 | vstor_packet->vm_srb.sense_info_length; | |
512 | ||
513 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
514 | vstor_packet->vm_srb.srb_status != 1){ | |
d181daa0 GKH |
515 | dev_warn(&device->device, |
516 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
517 | stor_pkt->vm_srb.cdb[0], | |
518 | vstor_packet->vm_srb.scsi_status, | |
519 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
520 | } |
521 | ||
522 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
523 | /* CHECK_CONDITION */ | |
524 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
525 | /* autosense data available */ | |
d181daa0 | 526 | dev_warn(&device->device, |
41098f8f S |
527 | "stor pkt %p autosense data valid - len %d\n", |
528 | request, | |
529 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
530 | |
531 | memcpy(request->sense_buffer, | |
532 | vstor_packet->vm_srb.sense_data, | |
533 | vstor_packet->vm_srb.sense_info_length); | |
534 | ||
535 | } | |
536 | } | |
537 | ||
538 | stor_pkt->vm_srb.data_transfer_length = | |
539 | vstor_packet->vm_srb.data_transfer_length; | |
540 | ||
541 | request->on_io_completion(request); | |
542 | ||
543 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
544 | stor_device->drain_notify) | |
545 | wake_up(&stor_device->waiting_to_drain); | |
546 | ||
547 | ||
548 | } | |
549 | ||
550 | static void storvsc_on_receive(struct hv_device *device, | |
551 | struct vstor_packet *vstor_packet, | |
552 | struct hv_storvsc_request *request) | |
553 | { | |
554 | switch (vstor_packet->operation) { | |
555 | case VSTOR_OPERATION_COMPLETE_IO: | |
556 | storvsc_on_io_completion(device, vstor_packet, request); | |
557 | break; | |
558 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
559 | ||
560 | default: | |
561 | break; | |
562 | } | |
563 | } | |
564 | ||
565 | static void storvsc_on_channel_callback(void *context) | |
566 | { | |
567 | struct hv_device *device = (struct hv_device *)context; | |
568 | struct storvsc_device *stor_device; | |
569 | u32 bytes_recvd; | |
570 | u64 request_id; | |
571 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
572 | struct hv_storvsc_request *request; | |
573 | int ret; | |
574 | ||
575 | ||
576 | stor_device = get_in_stor_device(device); | |
577 | if (!stor_device) | |
578 | return; | |
579 | ||
580 | do { | |
581 | ret = vmbus_recvpacket(device->channel, packet, | |
582 | ALIGN(sizeof(struct vstor_packet), 8), | |
583 | &bytes_recvd, &request_id); | |
584 | if (ret == 0 && bytes_recvd > 0) { | |
585 | ||
586 | request = (struct hv_storvsc_request *) | |
587 | (unsigned long)request_id; | |
588 | ||
589 | if ((request == &stor_device->init_request) || | |
590 | (request == &stor_device->reset_request)) { | |
591 | ||
592 | memcpy(&request->vstor_packet, packet, | |
593 | sizeof(struct vstor_packet)); | |
594 | complete(&request->wait_event); | |
595 | } else { | |
596 | storvsc_on_receive(device, | |
597 | (struct vstor_packet *)packet, | |
598 | request); | |
599 | } | |
600 | } else { | |
601 | break; | |
602 | } | |
603 | } while (1); | |
604 | ||
605 | return; | |
606 | } | |
607 | ||
608 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
609 | { | |
610 | struct vmstorage_channel_properties props; | |
611 | int ret; | |
612 | ||
613 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
614 | ||
615 | /* Open the channel */ | |
616 | ret = vmbus_open(device->channel, | |
617 | ring_size, | |
618 | ring_size, | |
619 | (void *)&props, | |
620 | sizeof(struct vmstorage_channel_properties), | |
621 | storvsc_on_channel_callback, device); | |
622 | ||
623 | if (ret != 0) | |
624 | return ret; | |
625 | ||
626 | ret = storvsc_channel_init(device); | |
627 | ||
628 | return ret; | |
629 | } | |
630 | ||
c1b3d067 | 631 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
632 | { |
633 | struct storvsc_device *stor_device; | |
634 | unsigned long flags; | |
635 | ||
cd654ea1 | 636 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
637 | |
638 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
639 | stor_device->destroy = true; | |
640 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
641 | ||
642 | /* | |
643 | * At this point, all outbound traffic should be disable. We | |
644 | * only allow inbound traffic (responses) to proceed so that | |
645 | * outstanding requests can be completed. | |
646 | */ | |
647 | ||
648 | storvsc_wait_to_drain(stor_device); | |
649 | ||
650 | /* | |
651 | * Since we have already drained, we don't need to busy wait | |
652 | * as was done in final_release_stor_device() | |
653 | * Note that we cannot set the ext pointer to NULL until | |
654 | * we have drained - to drain the outgoing packets, we need to | |
655 | * allow incoming packets. | |
656 | */ | |
657 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 658 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
659 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
660 | ||
661 | /* Close the channel */ | |
662 | vmbus_close(device->channel); | |
663 | ||
664 | kfree(stor_device); | |
665 | return 0; | |
666 | } | |
667 | ||
c1b3d067 | 668 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
669 | struct hv_storvsc_request *request) |
670 | { | |
671 | struct storvsc_device *stor_device; | |
672 | struct vstor_packet *vstor_packet; | |
673 | int ret = 0; | |
674 | ||
675 | vstor_packet = &request->vstor_packet; | |
676 | stor_device = get_out_stor_device(device); | |
677 | ||
678 | if (!stor_device) | |
679 | return -ENODEV; | |
680 | ||
681 | ||
682 | request->device = device; | |
683 | ||
684 | ||
685 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
686 | ||
687 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
688 | ||
689 | ||
690 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
691 | ||
692 | ||
693 | vstor_packet->vm_srb.data_transfer_length = | |
694 | request->data_buffer.len; | |
695 | ||
696 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
697 | ||
698 | if (request->data_buffer.len) { | |
699 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
700 | &request->data_buffer, | |
701 | vstor_packet, | |
702 | sizeof(struct vstor_packet), | |
703 | (unsigned long)request); | |
704 | } else { | |
705 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
706 | sizeof(struct vstor_packet), | |
707 | (unsigned long)request, | |
708 | VM_PKT_DATA_INBAND, | |
709 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
710 | } | |
711 | ||
712 | if (ret != 0) | |
713 | return ret; | |
714 | ||
715 | atomic_inc(&stor_device->num_outstanding_req); | |
716 | ||
717 | return ret; | |
718 | } | |
719 | ||
bd1f5d6a S |
720 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
721 | { | |
722 | *target = | |
723 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
724 | ||
725 | *path = | |
726 | dev->dev_instance.b[3] << 24 | | |
727 | dev->dev_instance.b[2] << 16 | | |
728 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
729 | } | |
730 | ||
bef4a34a | 731 | |
5b60acee S |
732 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
733 | { | |
734 | /* | |
735 | * This enables luns to be located sparsely. Otherwise, we may not | |
736 | * discovered them. | |
737 | */ | |
738 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
739 | return 0; | |
740 | } | |
741 | ||
a1ebfeae S |
742 | static int storvsc_merge_bvec(struct request_queue *q, |
743 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
744 | { | |
745 | /* checking done by caller. */ | |
746 | return bvec->bv_len; | |
747 | } | |
748 | ||
419f2d03 S |
749 | static int storvsc_device_configure(struct scsi_device *sdevice) |
750 | { | |
751 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
752 | STORVSC_MAX_IO_REQUESTS); | |
753 | ||
419f2d03 S |
754 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
755 | ||
419f2d03 S |
756 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
757 | ||
758 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
759 | |
760 | return 0; | |
761 | } | |
762 | ||
49a3c7a9 S |
763 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
764 | unsigned int sg_count) | |
765 | { | |
766 | int i; | |
767 | struct page *page_buf; | |
768 | ||
769 | for (i = 0; i < sg_count; i++) { | |
770 | page_buf = sg_page((&sgl[i])); | |
771 | if (page_buf != NULL) | |
772 | __free_page(page_buf); | |
773 | } | |
774 | ||
775 | kfree(sgl); | |
776 | } | |
777 | ||
3862ef3e S |
778 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
779 | { | |
780 | int i; | |
781 | ||
782 | /* No need to check */ | |
783 | if (sg_count < 2) | |
784 | return -1; | |
785 | ||
786 | /* We have at least 2 sg entries */ | |
787 | for (i = 0; i < sg_count; i++) { | |
788 | if (i == 0) { | |
789 | /* make sure 1st one does not have hole */ | |
790 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
791 | return i; | |
792 | } else if (i == sg_count - 1) { | |
793 | /* make sure last one does not have hole */ | |
794 | if (sgl[i].offset != 0) | |
795 | return i; | |
796 | } else { | |
797 | /* make sure no hole in the middle */ | |
798 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
799 | return i; | |
800 | } | |
801 | } | |
802 | return -1; | |
803 | } | |
804 | ||
a9753cbd S |
805 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
806 | unsigned int sg_count, | |
807 | unsigned int len) | |
808 | { | |
809 | int i; | |
810 | int num_pages; | |
811 | struct scatterlist *bounce_sgl; | |
812 | struct page *page_buf; | |
813 | ||
814 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
815 | ||
816 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
817 | if (!bounce_sgl) | |
818 | return NULL; | |
819 | ||
820 | for (i = 0; i < num_pages; i++) { | |
821 | page_buf = alloc_page(GFP_ATOMIC); | |
822 | if (!page_buf) | |
823 | goto cleanup; | |
824 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
825 | } | |
826 | ||
827 | return bounce_sgl; | |
828 | ||
829 | cleanup: | |
830 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
831 | return NULL; | |
832 | } | |
833 | ||
29fe2c9b S |
834 | |
835 | /* Assume the original sgl has enough room */ | |
836 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
837 | struct scatterlist *bounce_sgl, | |
838 | unsigned int orig_sgl_count) | |
839 | { | |
840 | int i; | |
841 | int j = 0; | |
842 | unsigned long src, dest; | |
843 | unsigned int srclen, destlen, copylen; | |
844 | unsigned int total_copied = 0; | |
845 | unsigned long bounce_addr = 0; | |
846 | unsigned long dest_addr = 0; | |
847 | unsigned long flags; | |
848 | ||
849 | local_irq_save(flags); | |
850 | ||
851 | for (i = 0; i < orig_sgl_count; i++) { | |
852 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
853 | KM_IRQ0) + orig_sgl[i].offset; | |
854 | dest = dest_addr; | |
855 | destlen = orig_sgl[i].length; | |
856 | ||
857 | if (bounce_addr == 0) | |
858 | bounce_addr = | |
859 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
860 | KM_IRQ0); | |
861 | ||
862 | while (destlen) { | |
863 | src = bounce_addr + bounce_sgl[j].offset; | |
864 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
865 | ||
866 | copylen = min(srclen, destlen); | |
867 | memcpy((void *)dest, (void *)src, copylen); | |
868 | ||
869 | total_copied += copylen; | |
870 | bounce_sgl[j].offset += copylen; | |
871 | destlen -= copylen; | |
872 | dest += copylen; | |
873 | ||
874 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
875 | /* full */ | |
876 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
877 | j++; | |
878 | ||
879 | /* if we need to use another bounce buffer */ | |
880 | if (destlen || i != orig_sgl_count - 1) | |
881 | bounce_addr = | |
882 | (unsigned long)kmap_atomic( | |
883 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
884 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
885 | /* unmap the last bounce that is < PAGE_SIZE */ | |
886 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
887 | } | |
888 | } | |
889 | ||
890 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
891 | KM_IRQ0); | |
892 | } | |
893 | ||
894 | local_irq_restore(flags); | |
895 | ||
896 | return total_copied; | |
897 | } | |
898 | ||
6a8ff44b S |
899 | |
900 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
901 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
902 | struct scatterlist *bounce_sgl, | |
903 | unsigned int orig_sgl_count) | |
904 | { | |
905 | int i; | |
906 | int j = 0; | |
907 | unsigned long src, dest; | |
908 | unsigned int srclen, destlen, copylen; | |
909 | unsigned int total_copied = 0; | |
910 | unsigned long bounce_addr = 0; | |
911 | unsigned long src_addr = 0; | |
912 | unsigned long flags; | |
913 | ||
914 | local_irq_save(flags); | |
915 | ||
916 | for (i = 0; i < orig_sgl_count; i++) { | |
917 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
918 | KM_IRQ0) + orig_sgl[i].offset; | |
919 | src = src_addr; | |
920 | srclen = orig_sgl[i].length; | |
921 | ||
922 | if (bounce_addr == 0) | |
923 | bounce_addr = | |
924 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
925 | KM_IRQ0); | |
926 | ||
927 | while (srclen) { | |
928 | /* assume bounce offset always == 0 */ | |
929 | dest = bounce_addr + bounce_sgl[j].length; | |
930 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
931 | ||
932 | copylen = min(srclen, destlen); | |
933 | memcpy((void *)dest, (void *)src, copylen); | |
934 | ||
935 | total_copied += copylen; | |
936 | bounce_sgl[j].length += copylen; | |
937 | srclen -= copylen; | |
938 | src += copylen; | |
939 | ||
940 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
941 | /* full..move to next entry */ | |
942 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
943 | j++; | |
944 | ||
945 | /* if we need to use another bounce buffer */ | |
946 | if (srclen || i != orig_sgl_count - 1) | |
947 | bounce_addr = | |
948 | (unsigned long)kmap_atomic( | |
949 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
950 | ||
951 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
952 | /* unmap the last bounce that is < PAGE_SIZE */ | |
953 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
954 | } | |
955 | } | |
956 | ||
957 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
958 | } | |
959 | ||
960 | local_irq_restore(flags); | |
961 | ||
962 | return total_copied; | |
963 | } | |
964 | ||
5c5c0234 | 965 | |
5c5c0234 S |
966 | static int storvsc_remove(struct hv_device *dev) |
967 | { | |
cd654ea1 S |
968 | struct storvsc_device *stor_device = hv_get_drvdata(dev); |
969 | struct Scsi_Host *host = stor_device->host; | |
7f33f30a | 970 | struct hv_host_device *host_dev = shost_priv(host); |
5c5c0234 | 971 | |
2935a407 S |
972 | scsi_remove_host(host); |
973 | ||
2935a407 | 974 | scsi_host_put(host); |
d36b0a03 | 975 | |
6cdc57c0 | 976 | storvsc_dev_remove(dev); |
5c5c0234 | 977 | if (host_dev->request_pool) { |
4e03e697 | 978 | mempool_destroy(host_dev->request_mempool); |
5c5c0234 S |
979 | kmem_cache_destroy(host_dev->request_pool); |
980 | host_dev->request_pool = NULL; | |
4e03e697 | 981 | host_dev->request_mempool = NULL; |
5c5c0234 | 982 | } |
5c5c0234 S |
983 | return 0; |
984 | } | |
985 | ||
62838ce2 S |
986 | |
987 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
988 | sector_t capacity, int *info) | |
989 | { | |
5326fd5c S |
990 | sector_t nsect = capacity; |
991 | sector_t cylinders = nsect; | |
992 | int heads, sectors_pt; | |
62838ce2 | 993 | |
5326fd5c S |
994 | /* |
995 | * We are making up these values; let us keep it simple. | |
996 | */ | |
997 | heads = 0xff; | |
998 | sectors_pt = 0x3f; /* Sectors per track */ | |
999 | sector_div(cylinders, heads * sectors_pt); | |
1000 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1001 | cylinders = 0xffff; | |
62838ce2 S |
1002 | |
1003 | info[0] = heads; | |
5326fd5c S |
1004 | info[1] = sectors_pt; |
1005 | info[2] = (int)cylinders; | |
62838ce2 | 1006 | |
62838ce2 S |
1007 | return 0; |
1008 | } | |
aa3d789e S |
1009 | |
1010 | static int storvsc_host_reset(struct hv_device *device) | |
1011 | { | |
1012 | struct storvsc_device *stor_device; | |
1013 | struct hv_storvsc_request *request; | |
1014 | struct vstor_packet *vstor_packet; | |
1015 | int ret, t; | |
1016 | ||
aa3d789e | 1017 | |
1eaaddf9 | 1018 | stor_device = get_out_stor_device(device); |
aa3d789e | 1019 | if (!stor_device) |
a00e8224 | 1020 | return FAILED; |
aa3d789e S |
1021 | |
1022 | request = &stor_device->reset_request; | |
1023 | vstor_packet = &request->vstor_packet; | |
1024 | ||
1025 | init_completion(&request->wait_event); | |
1026 | ||
1027 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1028 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1029 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1030 | ||
1031 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1032 | sizeof(struct vstor_packet), | |
1033 | (unsigned long)&stor_device->reset_request, | |
1034 | VM_PKT_DATA_INBAND, | |
1035 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1036 | if (ret != 0) | |
a00e8224 | 1037 | return FAILED; |
aa3d789e | 1038 | |
46d2eb6d | 1039 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1040 | if (t == 0) |
1041 | return TIMEOUT_ERROR; | |
aa3d789e | 1042 | |
aa3d789e S |
1043 | |
1044 | /* | |
1045 | * At this point, all outstanding requests in the adapter | |
1046 | * should have been flushed out and return to us | |
1047 | */ | |
1048 | ||
a00e8224 | 1049 | return SUCCESS; |
aa3d789e S |
1050 | } |
1051 | ||
1052 | ||
96e690be S |
1053 | /* |
1054 | * storvsc_host_reset_handler - Reset the scsi HBA | |
1055 | */ | |
1056 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
1057 | { | |
7f33f30a | 1058 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
96e690be S |
1059 | struct hv_device *dev = host_dev->dev; |
1060 | ||
a00e8224 | 1061 | return storvsc_host_reset(dev); |
96e690be S |
1062 | } |
1063 | ||
8a411bad S |
1064 | |
1065 | /* | |
b8de73df | 1066 | * storvsc_command_completion - Command completion processing |
8a411bad | 1067 | */ |
b8de73df | 1068 | static void storvsc_command_completion(struct hv_storvsc_request *request) |
8a411bad S |
1069 | { |
1070 | struct storvsc_cmd_request *cmd_request = | |
1071 | (struct storvsc_cmd_request *)request->context; | |
1072 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
7f33f30a | 1073 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
8a411bad S |
1074 | void (*scsi_done_fn)(struct scsi_cmnd *); |
1075 | struct scsi_sense_hdr sense_hdr; | |
1076 | struct vmscsi_request *vm_srb; | |
1077 | ||
3612ef99 | 1078 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1079 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
1080 | if (vm_srb->data_in == READ_TYPE) { |
1081 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
1082 | cmd_request->bounce_sgl, |
1083 | scsi_sg_count(scmnd)); | |
3612ef99 S |
1084 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
1085 | cmd_request->bounce_sgl_count); | |
1086 | } | |
8a411bad S |
1087 | } |
1088 | ||
2544b794 S |
1089 | /* |
1090 | * If there is an error; offline the device since all | |
1091 | * error recovery strategies would have already been | |
1092 | * deployed on the host side. | |
1093 | */ | |
1094 | if (vm_srb->srb_status == 0x4) | |
1095 | scmnd->result = DID_TARGET_FAILURE << 16; | |
1096 | else | |
1097 | scmnd->result = vm_srb->scsi_status; | |
8a411bad S |
1098 | |
1099 | if (scmnd->result) { | |
1100 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1101 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1102 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1103 | } | |
1104 | ||
8a411bad S |
1105 | scsi_set_resid(scmnd, |
1106 | request->data_buffer.len - | |
1107 | vm_srb->data_transfer_length); | |
1108 | ||
1109 | scsi_done_fn = scmnd->scsi_done; | |
1110 | ||
1111 | scmnd->host_scribble = NULL; | |
1112 | scmnd->scsi_done = NULL; | |
1113 | ||
8a411bad S |
1114 | scsi_done_fn(scmnd); |
1115 | ||
4e03e697 | 1116 | mempool_free(cmd_request, host_dev->request_mempool); |
8a411bad S |
1117 | } |
1118 | ||
92ae4ebd OH |
1119 | static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd) |
1120 | { | |
1121 | bool allowed = true; | |
1122 | u8 scsi_op = scmnd->cmnd[0]; | |
1123 | ||
1124 | switch (scsi_op) { | |
41098f8f S |
1125 | /* smartd sends this command, which will offline the device */ |
1126 | case SET_WINDOW: | |
59e00e74 | 1127 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1128 | allowed = false; |
1129 | break; | |
1130 | default: | |
1131 | break; | |
92ae4ebd OH |
1132 | } |
1133 | return allowed; | |
1134 | } | |
c5b463ae S |
1135 | |
1136 | /* | |
1137 | * storvsc_queuecommand - Initiate command processing | |
1138 | */ | |
bab445e1 | 1139 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1140 | { |
1141 | int ret; | |
bab445e1 | 1142 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1143 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1144 | struct hv_storvsc_request *request; |
1145 | struct storvsc_cmd_request *cmd_request; | |
1146 | unsigned int request_size = 0; | |
1147 | int i; | |
1148 | struct scatterlist *sgl; | |
1149 | unsigned int sg_count = 0; | |
1150 | struct vmscsi_request *vm_srb; | |
1151 | ||
92ae4ebd | 1152 | if (storvsc_check_scsi_cmd(scmnd) == false) { |
bab445e1 | 1153 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1154 | return 0; |
1155 | } | |
c5b463ae S |
1156 | |
1157 | /* If retrying, no need to prep the cmd */ | |
1158 | if (scmnd->host_scribble) { | |
c5b463ae S |
1159 | |
1160 | cmd_request = | |
1161 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
1162 | |
1163 | goto retry_request; | |
1164 | } | |
1165 | ||
c5b463ae S |
1166 | request_size = sizeof(struct storvsc_cmd_request); |
1167 | ||
4e03e697 | 1168 | cmd_request = mempool_alloc(host_dev->request_mempool, |
c5b463ae | 1169 | GFP_ATOMIC); |
bab445e1 | 1170 | if (!cmd_request) |
c5b463ae | 1171 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1172 | |
4e03e697 | 1173 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1174 | |
1175 | /* Setup the cmd request */ | |
1176 | cmd_request->bounce_sgl_count = 0; | |
1177 | cmd_request->bounce_sgl = NULL; | |
1178 | cmd_request->cmd = scmnd; | |
1179 | ||
1180 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1181 | ||
1182 | request = &cmd_request->request; | |
1183 | vm_srb = &request->vstor_packet.vm_srb; | |
1184 | ||
1185 | ||
1186 | /* Build the SRB */ | |
1187 | switch (scmnd->sc_data_direction) { | |
1188 | case DMA_TO_DEVICE: | |
1189 | vm_srb->data_in = WRITE_TYPE; | |
1190 | break; | |
1191 | case DMA_FROM_DEVICE: | |
1192 | vm_srb->data_in = READ_TYPE; | |
1193 | break; | |
1194 | default: | |
1195 | vm_srb->data_in = UNKNOWN_TYPE; | |
1196 | break; | |
1197 | } | |
1198 | ||
b8de73df | 1199 | request->on_io_completion = storvsc_command_completion; |
c5b463ae S |
1200 | request->context = cmd_request;/* scmnd; */ |
1201 | ||
c5b463ae S |
1202 | vm_srb->port_number = host_dev->port; |
1203 | vm_srb->path_id = scmnd->device->channel; | |
1204 | vm_srb->target_id = scmnd->device->id; | |
1205 | vm_srb->lun = scmnd->device->lun; | |
1206 | ||
c5b463ae S |
1207 | vm_srb->cdb_length = scmnd->cmd_len; |
1208 | ||
1209 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1210 | ||
1211 | request->sense_buffer = scmnd->sense_buffer; | |
1212 | ||
1213 | ||
1214 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1215 | if (scsi_sg_count(scmnd)) { | |
1216 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1217 | sg_count = scsi_sg_count(scmnd); | |
1218 | ||
1219 | /* check if we need to bounce the sgl */ | |
1220 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1221 | cmd_request->bounce_sgl = | |
1222 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
1223 | scsi_bufflen(scmnd)); | |
1224 | if (!cmd_request->bounce_sgl) { | |
c5b463ae | 1225 | scmnd->host_scribble = NULL; |
4e03e697 S |
1226 | mempool_free(cmd_request, |
1227 | host_dev->request_mempool); | |
c5b463ae S |
1228 | |
1229 | return SCSI_MLQUEUE_HOST_BUSY; | |
1230 | } | |
1231 | ||
1232 | cmd_request->bounce_sgl_count = | |
1233 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1234 | PAGE_SHIFT; | |
1235 | ||
fa23b8c7 S |
1236 | if (vm_srb->data_in == WRITE_TYPE) |
1237 | copy_to_bounce_buffer(sgl, | |
1238 | cmd_request->bounce_sgl, | |
1239 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1240 | |
1241 | sgl = cmd_request->bounce_sgl; | |
1242 | sg_count = cmd_request->bounce_sgl_count; | |
1243 | } | |
1244 | ||
1245 | request->data_buffer.offset = sgl[0].offset; | |
1246 | ||
1247 | for (i = 0; i < sg_count; i++) | |
1248 | request->data_buffer.pfn_array[i] = | |
1249 | page_to_pfn(sg_page((&sgl[i]))); | |
1250 | ||
1251 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1252 | request->data_buffer.offset = |
1253 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1254 | request->data_buffer.pfn_array[0] = | |
1255 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1256 | } | |
1257 | ||
1258 | retry_request: | |
1259 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1260 | ret = storvsc_do_io(dev, &cmd_request->request); |
1261 | ||
d2598f01 | 1262 | if (ret == -EAGAIN) { |
c5b463ae S |
1263 | /* no more space */ |
1264 | ||
70691ec6 | 1265 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1266 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1267 | cmd_request->bounce_sgl_count); |
c5b463ae | 1268 | |
4e03e697 | 1269 | mempool_free(cmd_request, host_dev->request_mempool); |
c5b463ae | 1270 | |
c5b463ae S |
1271 | scmnd->host_scribble = NULL; |
1272 | ||
1273 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1274 | } | |
1275 | ||
1276 | return ret; | |
1277 | } | |
1278 | ||
454f18a9 | 1279 | /* Scsi driver */ |
bef4a34a | 1280 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1281 | .module = THIS_MODULE, |
1282 | .name = "storvsc_host_t", | |
1283 | .bios_param = storvsc_get_chs, | |
1284 | .queuecommand = storvsc_queuecommand, | |
1285 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1286 | .slave_alloc = storvsc_device_alloc, | |
1287 | .slave_configure = storvsc_device_configure, | |
1288 | .cmd_per_lun = 1, | |
1289 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1290 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1291 | .this_id = -1, |
454f18a9 | 1292 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1293 | /* currently 32 */ |
1294 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1295 | /* | |
1296 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1297 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1298 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1299 | * multiple | |
1300 | */ | |
454f18a9 | 1301 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1302 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1303 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1304 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1305 | }; |
1306 | ||
ef52a81b S |
1307 | enum { |
1308 | SCSI_GUID, | |
1309 | IDE_GUID, | |
1310 | }; | |
1311 | ||
d847b5fe | 1312 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1313 | /* SCSI guid */ |
1314 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1315 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1316 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1317 | /* IDE guid */ |
1318 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1319 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1320 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1321 | { }, |
d847b5fe | 1322 | }; |
bef4a34a | 1323 | |
d847b5fe | 1324 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1325 | |
bd1f5d6a | 1326 | |
3e189519 | 1327 | /* |
ff568d3a GKH |
1328 | * storvsc_probe - Add a new device for this driver |
1329 | */ | |
f5c78872 | 1330 | |
84946899 S |
1331 | static int storvsc_probe(struct hv_device *device, |
1332 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1333 | { |
ff568d3a | 1334 | int ret; |
4e03e697 | 1335 | int number = STORVSC_MIN_BUF_NR; |
bef4a34a | 1336 | struct Scsi_Host *host; |
795b613d | 1337 | struct hv_host_device *host_dev; |
ef52a81b | 1338 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a S |
1339 | int path = 0; |
1340 | int target = 0; | |
6e4198ce | 1341 | struct storvsc_device *stor_device; |
bd1f5d6a | 1342 | |
ff568d3a | 1343 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1344 | sizeof(struct hv_host_device)); |
f8feed06 | 1345 | if (!host) |
bef4a34a | 1346 | return -ENOMEM; |
bef4a34a | 1347 | |
7f33f30a | 1348 | host_dev = shost_priv(host); |
795b613d | 1349 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1350 | |
795b613d | 1351 | host_dev->port = host->host_no; |
97c15296 | 1352 | host_dev->dev = device; |
bef4a34a | 1353 | |
795b613d | 1354 | host_dev->request_pool = |
9efd21e1 | 1355 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1356 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1357 | SLAB_HWCACHE_ALIGN, NULL); |
1358 | ||
795b613d | 1359 | if (!host_dev->request_pool) { |
bef4a34a | 1360 | scsi_host_put(host); |
bef4a34a HJ |
1361 | return -ENOMEM; |
1362 | } | |
1363 | ||
4e03e697 S |
1364 | host_dev->request_mempool = mempool_create(number, mempool_alloc_slab, |
1365 | mempool_free_slab, | |
1366 | host_dev->request_pool); | |
1367 | ||
1368 | if (!host_dev->request_mempool) { | |
225ce6ea S |
1369 | ret = -ENOMEM; |
1370 | goto err_out0; | |
4e03e697 S |
1371 | } |
1372 | ||
a13d35ab | 1373 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1374 | if (!stor_device) { |
225ce6ea S |
1375 | ret = -ENOMEM; |
1376 | goto err_out1; | |
6e4198ce | 1377 | } |
9efd21e1 | 1378 | |
a13d35ab S |
1379 | stor_device->destroy = false; |
1380 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1381 | stor_device->device = device; | |
cd654ea1 S |
1382 | stor_device->host = host; |
1383 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1384 | |
6e4198ce S |
1385 | stor_device->port_number = host->host_no; |
1386 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea S |
1387 | if (ret) |
1388 | goto err_out2; | |
bef4a34a | 1389 | |
bd1f5d6a S |
1390 | if (dev_is_ide) |
1391 | storvsc_get_ide_info(device, &target, &path); | |
1392 | ||
6e4198ce S |
1393 | host_dev->path = stor_device->path_id; |
1394 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1395 | |
ff568d3a GKH |
1396 | /* max # of devices per target */ |
1397 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1398 | /* max # of targets per channel */ | |
1399 | host->max_id = STORVSC_MAX_TARGETS; | |
1400 | /* max # of channels */ | |
1401 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1402 | /* max cmd length */ |
1403 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1404 | |
454f18a9 | 1405 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1406 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1407 | if (ret != 0) |
225ce6ea | 1408 | goto err_out3; |
bef4a34a | 1409 | |
bd1f5d6a S |
1410 | if (!dev_is_ide) { |
1411 | scsi_scan_host(host); | |
1412 | return 0; | |
1413 | } | |
1414 | ret = scsi_add_device(host, 0, target, 0); | |
1415 | if (ret) { | |
1416 | scsi_remove_host(host); | |
225ce6ea | 1417 | goto err_out3; |
bef4a34a | 1418 | } |
bd1f5d6a | 1419 | return 0; |
bef4a34a | 1420 | |
225ce6ea S |
1421 | err_out3: |
1422 | /* | |
1423 | * Once we have connected with the host, we would need to | |
1424 | * to invoke storvsc_dev_remove() to rollback this state and | |
1425 | * this call also frees up the stor_device; hence the jump around | |
1426 | * err_out2 label. | |
1427 | */ | |
bd1f5d6a | 1428 | storvsc_dev_remove(device); |
225ce6ea S |
1429 | goto err_out1; |
1430 | ||
1431 | err_out2: | |
1432 | kfree(stor_device); | |
1433 | ||
1434 | err_out1: | |
4e03e697 | 1435 | mempool_destroy(host_dev->request_mempool); |
225ce6ea S |
1436 | |
1437 | err_out0: | |
bd1f5d6a S |
1438 | kmem_cache_destroy(host_dev->request_pool); |
1439 | scsi_host_put(host); | |
225ce6ea | 1440 | return ret; |
bef4a34a HJ |
1441 | } |
1442 | ||
7bd05b91 S |
1443 | /* The one and only one */ |
1444 | ||
40bf63ed | 1445 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1446 | .name = KBUILD_MODNAME, |
d847b5fe | 1447 | .id_table = id_table, |
40bf63ed S |
1448 | .probe = storvsc_probe, |
1449 | .remove = storvsc_remove, | |
39ae6fae | 1450 | }; |
7bd05b91 | 1451 | |
d9bbae83 | 1452 | static int __init storvsc_drv_init(void) |
f5c78872 | 1453 | { |
01415ab3 S |
1454 | u32 max_outstanding_req_per_channel; |
1455 | ||
1456 | /* | |
1457 | * Divide the ring buffer data size (which is 1 page less | |
1458 | * than the ring buffer size since that page is reserved for | |
1459 | * the ring buffer indices) by the max request size (which is | |
1460 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1461 | */ | |
01415ab3 | 1462 | max_outstanding_req_per_channel = |
768fa219 GKH |
1463 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1464 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1465 | sizeof(struct vstor_packet) + sizeof(u64), | |
1466 | sizeof(u64))); | |
f5c78872 | 1467 | |
01415ab3 | 1468 | if (max_outstanding_req_per_channel < |
f5c78872 | 1469 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1470 | return -EINVAL; |
f5c78872 | 1471 | |
768fa219 | 1472 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1473 | } |
1474 | ||
c63ba9e1 | 1475 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1476 | { |
768fa219 | 1477 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1478 | } |
1479 | ||
ff568d3a | 1480 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1481 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1482 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1483 | module_init(storvsc_drv_init); |
c63ba9e1 | 1484 | module_exit(storvsc_drv_exit); |