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> | |
bef4a34a HJ |
34 | #include <scsi/scsi.h> |
35 | #include <scsi/scsi_cmnd.h> | |
36 | #include <scsi/scsi_host.h> | |
37 | #include <scsi/scsi_device.h> | |
38 | #include <scsi/scsi_tcq.h> | |
39 | #include <scsi/scsi_eh.h> | |
40 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 41 | #include <scsi/scsi_dbg.h> |
3f335ea2 S |
42 | |
43 | #include "hyperv.h" | |
f0d79fe9 | 44 | |
c1b3d067 S |
45 | #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
46 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
47 | ||
48 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
49 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
50 | ||
f0d79fe9 S |
51 | /* to alert the user that structure sizes may be mismatched even though the */ |
52 | /* protocol versions match. */ | |
53 | ||
54 | ||
55 | #define REVISION_STRING(REVISION_) #REVISION_ | |
56 | #define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \ | |
57 | do { \ | |
58 | char *revision_string \ | |
59 | = REVISION_STRING($Rev : 6 $) + 6; \ | |
60 | RESULT_LVALUE_ = 0; \ | |
61 | while (*revision_string >= '0' \ | |
62 | && *revision_string <= '9') { \ | |
63 | RESULT_LVALUE_ *= 10; \ | |
64 | RESULT_LVALUE_ += *revision_string - '0'; \ | |
65 | revision_string++; \ | |
66 | } \ | |
67 | } while (0) | |
68 | ||
69 | /* Major/minor macros. Minor version is in LSB, meaning that earlier flat */ | |
70 | /* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */ | |
71 | #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) | |
72 | #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) | |
73 | #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ | |
74 | (((MINOR_) & 0xff))) | |
75 | #define VMSTOR_INVALID_PROTOCOL_VERSION (-1) | |
76 | ||
77 | /* Version history: */ | |
78 | /* V1 Beta 0.1 */ | |
79 | /* V1 RC < 2008/1/31 1.0 */ | |
80 | /* V1 RC > 2008/1/31 2.0 */ | |
81 | #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0) | |
82 | ||
83 | ||
84 | ||
85 | ||
86 | /* This will get replaced with the max transfer length that is possible on */ | |
87 | /* the host adapter. */ | |
88 | /* The max transfer length will be published when we offer a vmbus channel. */ | |
89 | #define MAX_TRANSFER_LENGTH 0x40000 | |
90 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
91 | sizeof(struct vstor_packet) + \ | |
92 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
93 | ||
94 | ||
95 | /* Packet structure describing virtual storage requests. */ | |
96 | enum vstor_packet_operation { | |
97 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
98 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
99 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
100 | VSTOR_OPERATION_RESET_LUN = 4, | |
101 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
102 | VSTOR_OPERATION_RESET_BUS = 6, | |
103 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
104 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
105 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
106 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
107 | VSTOR_OPERATION_MAXIMUM = 10 | |
108 | }; | |
109 | ||
110 | /* | |
111 | * Platform neutral description of a scsi request - | |
112 | * this remains the same across the write regardless of 32/64 bit | |
113 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
114 | */ | |
115 | #define CDB16GENERIC_LENGTH 0x10 | |
116 | ||
117 | #ifndef SENSE_BUFFER_SIZE | |
118 | #define SENSE_BUFFER_SIZE 0x12 | |
119 | #endif | |
120 | ||
121 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
122 | ||
123 | struct vmscsi_request { | |
124 | unsigned short length; | |
125 | unsigned char srb_status; | |
126 | unsigned char scsi_status; | |
127 | ||
128 | unsigned char port_number; | |
129 | unsigned char path_id; | |
130 | unsigned char target_id; | |
131 | unsigned char lun; | |
132 | ||
133 | unsigned char cdb_length; | |
134 | unsigned char sense_info_length; | |
135 | unsigned char data_in; | |
136 | unsigned char reserved; | |
137 | ||
138 | unsigned int data_transfer_length; | |
139 | ||
140 | union { | |
141 | unsigned char cdb[CDB16GENERIC_LENGTH]; | |
142 | unsigned char sense_data[SENSE_BUFFER_SIZE]; | |
143 | unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
144 | }; | |
145 | } __attribute((packed)); | |
146 | ||
147 | ||
148 | /* | |
149 | * This structure is sent during the intialization phase to get the different | |
150 | * properties of the channel. | |
151 | */ | |
152 | struct vmstorage_channel_properties { | |
153 | unsigned short protocol_version; | |
154 | unsigned char path_id; | |
155 | unsigned char target_id; | |
156 | ||
157 | /* Note: port number is only really known on the client side */ | |
158 | unsigned int port_number; | |
159 | unsigned int flags; | |
160 | unsigned int max_transfer_bytes; | |
161 | ||
162 | /* This id is unique for each channel and will correspond with */ | |
163 | /* vendor specific data in the inquirydata */ | |
164 | unsigned long long unique_id; | |
165 | } __packed; | |
166 | ||
167 | /* This structure is sent during the storage protocol negotiations. */ | |
168 | struct vmstorage_protocol_version { | |
169 | /* Major (MSW) and minor (LSW) version numbers. */ | |
170 | unsigned short major_minor; | |
171 | ||
172 | /* | |
173 | * Revision number is auto-incremented whenever this file is changed | |
174 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
175 | * definitely indicate incompatibility--but it does indicate mismatched | |
176 | * builds. | |
177 | */ | |
178 | unsigned short revision; | |
179 | } __packed; | |
180 | ||
181 | /* Channel Property Flags */ | |
182 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
183 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
184 | ||
185 | struct vstor_packet { | |
186 | /* Requested operation type */ | |
187 | enum vstor_packet_operation operation; | |
188 | ||
189 | /* Flags - see below for values */ | |
190 | unsigned int flags; | |
191 | ||
192 | /* Status of the request returned from the server side. */ | |
193 | unsigned int status; | |
194 | ||
195 | /* Data payload area */ | |
196 | union { | |
197 | /* | |
198 | * Structure used to forward SCSI commands from the | |
199 | * client to the server. | |
200 | */ | |
201 | struct vmscsi_request vm_srb; | |
202 | ||
203 | /* Structure used to query channel properties. */ | |
204 | struct vmstorage_channel_properties storage_channel_properties; | |
205 | ||
206 | /* Used during version negotiations. */ | |
207 | struct vmstorage_protocol_version version; | |
208 | }; | |
209 | } __packed; | |
210 | ||
211 | /* Packet flags */ | |
212 | /* | |
213 | * This flag indicates that the server should send back a completion for this | |
214 | * packet. | |
215 | */ | |
216 | #define REQUEST_COMPLETION_FLAG 0x1 | |
217 | ||
218 | /* This is the set of flags that the vsc can set in any packets it sends */ | |
219 | #define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG) | |
220 | ||
221 | ||
222 | /* Defines */ | |
f0d79fe9 S |
223 | |
224 | #define STORVSC_MAX_IO_REQUESTS 128 | |
225 | ||
226 | /* | |
227 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
228 | * reality, the path/target is not used (ie always set to 0) so our | |
229 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
230 | * up to 256 luns. | |
231 | */ | |
232 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
233 | #define STORVSC_MAX_TARGETS 1 | |
234 | #define STORVSC_MAX_CHANNELS 1 | |
235 | ||
236 | struct hv_storvsc_request; | |
237 | ||
238 | /* Matches Windows-end */ | |
239 | enum storvsc_request_type { | |
240 | WRITE_TYPE, | |
241 | READ_TYPE, | |
242 | UNKNOWN_TYPE, | |
243 | }; | |
244 | ||
245 | ||
246 | struct hv_storvsc_request { | |
247 | struct hv_storvsc_request *request; | |
248 | struct hv_device *device; | |
249 | ||
250 | /* Synchronize the request/response if needed */ | |
251 | struct completion wait_event; | |
252 | ||
253 | unsigned char *sense_buffer; | |
254 | void *context; | |
255 | void (*on_io_completion)(struct hv_storvsc_request *request); | |
256 | struct hv_multipage_buffer data_buffer; | |
257 | ||
258 | struct vstor_packet vstor_packet; | |
259 | }; | |
260 | ||
261 | ||
262 | struct storvsc_device_info { | |
263 | u32 ring_buffer_size; | |
264 | unsigned int port_number; | |
265 | unsigned char path_id; | |
266 | unsigned char target_id; | |
267 | }; | |
268 | ||
f0d79fe9 S |
269 | |
270 | /* A storvsc device is a device object that contains a vmbus channel */ | |
271 | struct storvsc_device { | |
272 | struct hv_device *device; | |
273 | ||
274 | bool destroy; | |
275 | bool drain_notify; | |
276 | atomic_t num_outstanding_req; | |
277 | ||
278 | wait_queue_head_t waiting_to_drain; | |
279 | ||
280 | /* | |
281 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
282 | * controller. In reality, the pathid, targetid is always 0 | |
283 | * and the port is set by us | |
284 | */ | |
285 | unsigned int port_number; | |
286 | unsigned char path_id; | |
287 | unsigned char target_id; | |
288 | ||
289 | /* Used for vsc/vsp channel reset process */ | |
290 | struct hv_storvsc_request init_request; | |
291 | struct hv_storvsc_request reset_request; | |
292 | }; | |
293 | ||
c1b3d067 S |
294 | struct hv_host_device { |
295 | struct hv_device *dev; | |
296 | struct kmem_cache *request_pool; | |
297 | unsigned int port; | |
298 | unsigned char path; | |
299 | unsigned char target; | |
300 | }; | |
301 | ||
302 | struct storvsc_cmd_request { | |
303 | struct list_head entry; | |
304 | struct scsi_cmnd *cmd; | |
305 | ||
306 | unsigned int bounce_sgl_count; | |
307 | struct scatterlist *bounce_sgl; | |
308 | ||
309 | struct hv_storvsc_request request; | |
310 | }; | |
f0d79fe9 S |
311 | |
312 | static inline struct storvsc_device *get_out_stor_device( | |
313 | struct hv_device *device) | |
314 | { | |
315 | struct storvsc_device *stor_device; | |
316 | ||
317 | stor_device = (struct storvsc_device *)device->ext; | |
318 | ||
319 | if (stor_device && stor_device->destroy) | |
320 | stor_device = NULL; | |
321 | ||
322 | return stor_device; | |
323 | } | |
324 | ||
325 | ||
326 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
327 | { | |
328 | dev->drain_notify = true; | |
329 | wait_event(dev->waiting_to_drain, | |
330 | atomic_read(&dev->num_outstanding_req) == 0); | |
331 | dev->drain_notify = false; | |
332 | } | |
bef4a34a | 333 | |
8dcf37d4 S |
334 | static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) |
335 | { | |
336 | struct storvsc_device *stor_device; | |
337 | ||
338 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); | |
339 | if (!stor_device) | |
340 | return NULL; | |
341 | ||
342 | stor_device->destroy = false; | |
343 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
344 | stor_device->device = device; | |
345 | device->ext = stor_device; | |
346 | ||
347 | return stor_device; | |
348 | } | |
349 | ||
350 | ||
351 | static inline struct storvsc_device *get_in_stor_device( | |
352 | struct hv_device *device) | |
353 | { | |
354 | struct storvsc_device *stor_device; | |
8dcf37d4 | 355 | |
8dcf37d4 S |
356 | stor_device = (struct storvsc_device *)device->ext; |
357 | ||
358 | if (!stor_device) | |
359 | goto get_in_err; | |
360 | ||
361 | /* | |
362 | * If the device is being destroyed; allow incoming | |
363 | * traffic only to cleanup outstanding requests. | |
364 | */ | |
365 | ||
366 | if (stor_device->destroy && | |
367 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
368 | stor_device = NULL; | |
369 | ||
370 | get_in_err: | |
8dcf37d4 S |
371 | return stor_device; |
372 | ||
373 | } | |
374 | ||
375 | static int storvsc_channel_init(struct hv_device *device) | |
376 | { | |
377 | struct storvsc_device *stor_device; | |
378 | struct hv_storvsc_request *request; | |
379 | struct vstor_packet *vstor_packet; | |
380 | int ret, t; | |
381 | ||
382 | stor_device = get_out_stor_device(device); | |
383 | if (!stor_device) | |
384 | return -ENODEV; | |
385 | ||
386 | request = &stor_device->init_request; | |
387 | vstor_packet = &request->vstor_packet; | |
388 | ||
389 | /* | |
390 | * Now, initiate the vsc/vsp initialization protocol on the open | |
391 | * channel | |
392 | */ | |
393 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
394 | init_completion(&request->wait_event); | |
395 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
396 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
397 | ||
398 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
399 | sizeof(struct vstor_packet), | |
400 | (unsigned long)request, | |
401 | VM_PKT_DATA_INBAND, | |
402 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
403 | if (ret != 0) | |
404 | goto cleanup; | |
405 | ||
406 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
407 | if (t == 0) { | |
408 | ret = -ETIMEDOUT; | |
409 | goto cleanup; | |
410 | } | |
411 | ||
412 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
413 | vstor_packet->status != 0) | |
414 | goto cleanup; | |
415 | ||
416 | ||
417 | /* reuse the packet for version range supported */ | |
418 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
419 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
420 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
421 | ||
422 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
423 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
424 | ||
425 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
426 | sizeof(struct vstor_packet), | |
427 | (unsigned long)request, | |
428 | VM_PKT_DATA_INBAND, | |
429 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
430 | if (ret != 0) | |
431 | goto cleanup; | |
432 | ||
433 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
434 | if (t == 0) { | |
435 | ret = -ETIMEDOUT; | |
436 | goto cleanup; | |
437 | } | |
438 | ||
439 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
440 | vstor_packet->status != 0) | |
441 | goto cleanup; | |
442 | ||
443 | ||
444 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
445 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
446 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
447 | vstor_packet->storage_channel_properties.port_number = | |
448 | stor_device->port_number; | |
449 | ||
450 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
451 | sizeof(struct vstor_packet), | |
452 | (unsigned long)request, | |
453 | VM_PKT_DATA_INBAND, | |
454 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
455 | ||
456 | if (ret != 0) | |
457 | goto cleanup; | |
458 | ||
459 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
460 | if (t == 0) { | |
461 | ret = -ETIMEDOUT; | |
462 | goto cleanup; | |
463 | } | |
464 | ||
465 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
466 | vstor_packet->status != 0) | |
467 | goto cleanup; | |
468 | ||
469 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
470 | stor_device->target_id | |
471 | = vstor_packet->storage_channel_properties.target_id; | |
472 | ||
473 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
474 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
475 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
476 | ||
477 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
478 | sizeof(struct vstor_packet), | |
479 | (unsigned long)request, | |
480 | VM_PKT_DATA_INBAND, | |
481 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
482 | ||
483 | if (ret != 0) | |
484 | goto cleanup; | |
485 | ||
486 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
487 | if (t == 0) { | |
488 | ret = -ETIMEDOUT; | |
489 | goto cleanup; | |
490 | } | |
491 | ||
492 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
493 | vstor_packet->status != 0) | |
494 | goto cleanup; | |
495 | ||
496 | ||
497 | cleanup: | |
498 | return ret; | |
499 | } | |
500 | ||
501 | static void storvsc_on_io_completion(struct hv_device *device, | |
502 | struct vstor_packet *vstor_packet, | |
503 | struct hv_storvsc_request *request) | |
504 | { | |
505 | struct storvsc_device *stor_device; | |
506 | struct vstor_packet *stor_pkt; | |
507 | ||
508 | stor_device = (struct storvsc_device *)device->ext; | |
509 | ||
510 | stor_pkt = &request->vstor_packet; | |
511 | ||
4ed51a21 S |
512 | /* |
513 | * The current SCSI handling on the host side does | |
514 | * not correctly handle: | |
515 | * INQUIRY command with page code parameter set to 0x80 | |
516 | * MODE_SENSE command with cmd[2] == 0x1c | |
517 | * | |
518 | * Setup srb and scsi status so this won't be fatal. | |
519 | * We do this so we can distinguish truly fatal failues | |
520 | * (srb status == 0x4) and off-line the device in that case. | |
521 | */ | |
522 | ||
523 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
524 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { | |
525 | vstor_packet->vm_srb.scsi_status = 0; | |
526 | vstor_packet->vm_srb.srb_status = 0x1; | |
527 | } | |
528 | ||
8dcf37d4 S |
529 | |
530 | /* Copy over the status...etc */ | |
531 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
532 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
533 | stor_pkt->vm_srb.sense_info_length = | |
534 | vstor_packet->vm_srb.sense_info_length; | |
535 | ||
536 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
537 | vstor_packet->vm_srb.srb_status != 1){ | |
538 | DPRINT_WARN(STORVSC, | |
539 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
540 | stor_pkt->vm_srb.cdb[0], | |
541 | vstor_packet->vm_srb.scsi_status, | |
542 | vstor_packet->vm_srb.srb_status); | |
543 | } | |
544 | ||
545 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
546 | /* CHECK_CONDITION */ | |
547 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
548 | /* autosense data available */ | |
549 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
550 | "valid - len %d\n", request, | |
551 | vstor_packet->vm_srb.sense_info_length); | |
552 | ||
553 | memcpy(request->sense_buffer, | |
554 | vstor_packet->vm_srb.sense_data, | |
555 | vstor_packet->vm_srb.sense_info_length); | |
556 | ||
557 | } | |
558 | } | |
559 | ||
560 | stor_pkt->vm_srb.data_transfer_length = | |
561 | vstor_packet->vm_srb.data_transfer_length; | |
562 | ||
563 | request->on_io_completion(request); | |
564 | ||
565 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
566 | stor_device->drain_notify) | |
567 | wake_up(&stor_device->waiting_to_drain); | |
568 | ||
569 | ||
570 | } | |
571 | ||
572 | static void storvsc_on_receive(struct hv_device *device, | |
573 | struct vstor_packet *vstor_packet, | |
574 | struct hv_storvsc_request *request) | |
575 | { | |
576 | switch (vstor_packet->operation) { | |
577 | case VSTOR_OPERATION_COMPLETE_IO: | |
578 | storvsc_on_io_completion(device, vstor_packet, request); | |
579 | break; | |
580 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
581 | ||
582 | default: | |
583 | break; | |
584 | } | |
585 | } | |
586 | ||
587 | static void storvsc_on_channel_callback(void *context) | |
588 | { | |
589 | struct hv_device *device = (struct hv_device *)context; | |
590 | struct storvsc_device *stor_device; | |
591 | u32 bytes_recvd; | |
592 | u64 request_id; | |
593 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
594 | struct hv_storvsc_request *request; | |
595 | int ret; | |
596 | ||
597 | ||
598 | stor_device = get_in_stor_device(device); | |
599 | if (!stor_device) | |
600 | return; | |
601 | ||
602 | do { | |
603 | ret = vmbus_recvpacket(device->channel, packet, | |
604 | ALIGN(sizeof(struct vstor_packet), 8), | |
605 | &bytes_recvd, &request_id); | |
606 | if (ret == 0 && bytes_recvd > 0) { | |
607 | ||
608 | request = (struct hv_storvsc_request *) | |
609 | (unsigned long)request_id; | |
610 | ||
611 | if ((request == &stor_device->init_request) || | |
612 | (request == &stor_device->reset_request)) { | |
613 | ||
614 | memcpy(&request->vstor_packet, packet, | |
615 | sizeof(struct vstor_packet)); | |
616 | complete(&request->wait_event); | |
617 | } else { | |
618 | storvsc_on_receive(device, | |
619 | (struct vstor_packet *)packet, | |
620 | request); | |
621 | } | |
622 | } else { | |
623 | break; | |
624 | } | |
625 | } while (1); | |
626 | ||
627 | return; | |
628 | } | |
629 | ||
630 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
631 | { | |
632 | struct vmstorage_channel_properties props; | |
633 | int ret; | |
634 | ||
635 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
636 | ||
637 | /* Open the channel */ | |
638 | ret = vmbus_open(device->channel, | |
639 | ring_size, | |
640 | ring_size, | |
641 | (void *)&props, | |
642 | sizeof(struct vmstorage_channel_properties), | |
643 | storvsc_on_channel_callback, device); | |
644 | ||
645 | if (ret != 0) | |
646 | return ret; | |
647 | ||
648 | ret = storvsc_channel_init(device); | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
c1b3d067 | 653 | static int storvsc_dev_add(struct hv_device *device, |
8dcf37d4 S |
654 | void *additional_info) |
655 | { | |
656 | struct storvsc_device *stor_device; | |
657 | struct storvsc_device_info *device_info; | |
658 | int ret = 0; | |
659 | ||
660 | device_info = (struct storvsc_device_info *)additional_info; | |
661 | stor_device = alloc_stor_device(device); | |
662 | if (!stor_device) | |
663 | return -ENOMEM; | |
664 | ||
665 | /* Save the channel properties to our storvsc channel */ | |
666 | ||
667 | /* | |
668 | * If we support more than 1 scsi channel, we need to set the | |
669 | * port number here to the scsi channel but how do we get the | |
670 | * scsi channel prior to the bus scan. | |
671 | * | |
672 | * The host does not support this. | |
673 | */ | |
674 | ||
675 | stor_device->port_number = device_info->port_number; | |
676 | /* Send it back up */ | |
677 | ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); | |
678 | if (ret) { | |
679 | kfree(stor_device); | |
680 | return ret; | |
681 | } | |
682 | device_info->path_id = stor_device->path_id; | |
683 | device_info->target_id = stor_device->target_id; | |
684 | ||
685 | return ret; | |
686 | } | |
687 | ||
c1b3d067 | 688 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
689 | { |
690 | struct storvsc_device *stor_device; | |
691 | unsigned long flags; | |
692 | ||
693 | stor_device = (struct storvsc_device *)device->ext; | |
694 | ||
695 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
696 | stor_device->destroy = true; | |
697 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
698 | ||
699 | /* | |
700 | * At this point, all outbound traffic should be disable. We | |
701 | * only allow inbound traffic (responses) to proceed so that | |
702 | * outstanding requests can be completed. | |
703 | */ | |
704 | ||
705 | storvsc_wait_to_drain(stor_device); | |
706 | ||
707 | /* | |
708 | * Since we have already drained, we don't need to busy wait | |
709 | * as was done in final_release_stor_device() | |
710 | * Note that we cannot set the ext pointer to NULL until | |
711 | * we have drained - to drain the outgoing packets, we need to | |
712 | * allow incoming packets. | |
713 | */ | |
714 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
715 | device->ext = NULL; | |
716 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
717 | ||
718 | /* Close the channel */ | |
719 | vmbus_close(device->channel); | |
720 | ||
721 | kfree(stor_device); | |
722 | return 0; | |
723 | } | |
724 | ||
c1b3d067 | 725 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
726 | struct hv_storvsc_request *request) |
727 | { | |
728 | struct storvsc_device *stor_device; | |
729 | struct vstor_packet *vstor_packet; | |
730 | int ret = 0; | |
731 | ||
732 | vstor_packet = &request->vstor_packet; | |
733 | stor_device = get_out_stor_device(device); | |
734 | ||
735 | if (!stor_device) | |
736 | return -ENODEV; | |
737 | ||
738 | ||
739 | request->device = device; | |
740 | ||
741 | ||
742 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
743 | ||
744 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
745 | ||
746 | ||
747 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
748 | ||
749 | ||
750 | vstor_packet->vm_srb.data_transfer_length = | |
751 | request->data_buffer.len; | |
752 | ||
753 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
754 | ||
755 | if (request->data_buffer.len) { | |
756 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
757 | &request->data_buffer, | |
758 | vstor_packet, | |
759 | sizeof(struct vstor_packet), | |
760 | (unsigned long)request); | |
761 | } else { | |
762 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
763 | sizeof(struct vstor_packet), | |
764 | (unsigned long)request, | |
765 | VM_PKT_DATA_INBAND, | |
766 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
767 | } | |
768 | ||
769 | if (ret != 0) | |
770 | return ret; | |
771 | ||
772 | atomic_inc(&stor_device->num_outstanding_req); | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
bd1f5d6a S |
777 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
778 | { | |
779 | *target = | |
780 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
781 | ||
782 | *path = | |
783 | dev->dev_instance.b[3] << 24 | | |
784 | dev->dev_instance.b[2] << 16 | | |
785 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
786 | } | |
787 | ||
bef4a34a | 788 | |
5b60acee S |
789 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
790 | { | |
791 | /* | |
792 | * This enables luns to be located sparsely. Otherwise, we may not | |
793 | * discovered them. | |
794 | */ | |
795 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
796 | return 0; | |
797 | } | |
798 | ||
a1ebfeae S |
799 | static int storvsc_merge_bvec(struct request_queue *q, |
800 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
801 | { | |
802 | /* checking done by caller. */ | |
803 | return bvec->bv_len; | |
804 | } | |
805 | ||
419f2d03 S |
806 | static int storvsc_device_configure(struct scsi_device *sdevice) |
807 | { | |
808 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
809 | STORVSC_MAX_IO_REQUESTS); | |
810 | ||
419f2d03 S |
811 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
812 | ||
419f2d03 S |
813 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
814 | ||
815 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
816 | |
817 | return 0; | |
818 | } | |
819 | ||
49a3c7a9 S |
820 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
821 | unsigned int sg_count) | |
822 | { | |
823 | int i; | |
824 | struct page *page_buf; | |
825 | ||
826 | for (i = 0; i < sg_count; i++) { | |
827 | page_buf = sg_page((&sgl[i])); | |
828 | if (page_buf != NULL) | |
829 | __free_page(page_buf); | |
830 | } | |
831 | ||
832 | kfree(sgl); | |
833 | } | |
834 | ||
3862ef3e S |
835 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
836 | { | |
837 | int i; | |
838 | ||
839 | /* No need to check */ | |
840 | if (sg_count < 2) | |
841 | return -1; | |
842 | ||
843 | /* We have at least 2 sg entries */ | |
844 | for (i = 0; i < sg_count; i++) { | |
845 | if (i == 0) { | |
846 | /* make sure 1st one does not have hole */ | |
847 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
848 | return i; | |
849 | } else if (i == sg_count - 1) { | |
850 | /* make sure last one does not have hole */ | |
851 | if (sgl[i].offset != 0) | |
852 | return i; | |
853 | } else { | |
854 | /* make sure no hole in the middle */ | |
855 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
856 | return i; | |
857 | } | |
858 | } | |
859 | return -1; | |
860 | } | |
861 | ||
a9753cbd S |
862 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
863 | unsigned int sg_count, | |
864 | unsigned int len) | |
865 | { | |
866 | int i; | |
867 | int num_pages; | |
868 | struct scatterlist *bounce_sgl; | |
869 | struct page *page_buf; | |
870 | ||
871 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
872 | ||
873 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
874 | if (!bounce_sgl) | |
875 | return NULL; | |
876 | ||
877 | for (i = 0; i < num_pages; i++) { | |
878 | page_buf = alloc_page(GFP_ATOMIC); | |
879 | if (!page_buf) | |
880 | goto cleanup; | |
881 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
882 | } | |
883 | ||
884 | return bounce_sgl; | |
885 | ||
886 | cleanup: | |
887 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
888 | return NULL; | |
889 | } | |
890 | ||
29fe2c9b S |
891 | |
892 | /* Assume the original sgl has enough room */ | |
893 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
894 | struct scatterlist *bounce_sgl, | |
895 | unsigned int orig_sgl_count) | |
896 | { | |
897 | int i; | |
898 | int j = 0; | |
899 | unsigned long src, dest; | |
900 | unsigned int srclen, destlen, copylen; | |
901 | unsigned int total_copied = 0; | |
902 | unsigned long bounce_addr = 0; | |
903 | unsigned long dest_addr = 0; | |
904 | unsigned long flags; | |
905 | ||
906 | local_irq_save(flags); | |
907 | ||
908 | for (i = 0; i < orig_sgl_count; i++) { | |
909 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
910 | KM_IRQ0) + orig_sgl[i].offset; | |
911 | dest = dest_addr; | |
912 | destlen = orig_sgl[i].length; | |
913 | ||
914 | if (bounce_addr == 0) | |
915 | bounce_addr = | |
916 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
917 | KM_IRQ0); | |
918 | ||
919 | while (destlen) { | |
920 | src = bounce_addr + bounce_sgl[j].offset; | |
921 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
922 | ||
923 | copylen = min(srclen, destlen); | |
924 | memcpy((void *)dest, (void *)src, copylen); | |
925 | ||
926 | total_copied += copylen; | |
927 | bounce_sgl[j].offset += copylen; | |
928 | destlen -= copylen; | |
929 | dest += copylen; | |
930 | ||
931 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
932 | /* full */ | |
933 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
934 | j++; | |
935 | ||
936 | /* if we need to use another bounce buffer */ | |
937 | if (destlen || i != orig_sgl_count - 1) | |
938 | bounce_addr = | |
939 | (unsigned long)kmap_atomic( | |
940 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
941 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
942 | /* unmap the last bounce that is < PAGE_SIZE */ | |
943 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
944 | } | |
945 | } | |
946 | ||
947 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
948 | KM_IRQ0); | |
949 | } | |
950 | ||
951 | local_irq_restore(flags); | |
952 | ||
953 | return total_copied; | |
954 | } | |
955 | ||
6a8ff44b S |
956 | |
957 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
958 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
959 | struct scatterlist *bounce_sgl, | |
960 | unsigned int orig_sgl_count) | |
961 | { | |
962 | int i; | |
963 | int j = 0; | |
964 | unsigned long src, dest; | |
965 | unsigned int srclen, destlen, copylen; | |
966 | unsigned int total_copied = 0; | |
967 | unsigned long bounce_addr = 0; | |
968 | unsigned long src_addr = 0; | |
969 | unsigned long flags; | |
970 | ||
971 | local_irq_save(flags); | |
972 | ||
973 | for (i = 0; i < orig_sgl_count; i++) { | |
974 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
975 | KM_IRQ0) + orig_sgl[i].offset; | |
976 | src = src_addr; | |
977 | srclen = orig_sgl[i].length; | |
978 | ||
979 | if (bounce_addr == 0) | |
980 | bounce_addr = | |
981 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
982 | KM_IRQ0); | |
983 | ||
984 | while (srclen) { | |
985 | /* assume bounce offset always == 0 */ | |
986 | dest = bounce_addr + bounce_sgl[j].length; | |
987 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
988 | ||
989 | copylen = min(srclen, destlen); | |
990 | memcpy((void *)dest, (void *)src, copylen); | |
991 | ||
992 | total_copied += copylen; | |
993 | bounce_sgl[j].length += copylen; | |
994 | srclen -= copylen; | |
995 | src += copylen; | |
996 | ||
997 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
998 | /* full..move to next entry */ | |
999 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1000 | j++; | |
1001 | ||
1002 | /* if we need to use another bounce buffer */ | |
1003 | if (srclen || i != orig_sgl_count - 1) | |
1004 | bounce_addr = | |
1005 | (unsigned long)kmap_atomic( | |
1006 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
1007 | ||
1008 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
1009 | /* unmap the last bounce that is < PAGE_SIZE */ | |
1010 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
1015 | } | |
1016 | ||
1017 | local_irq_restore(flags); | |
1018 | ||
1019 | return total_copied; | |
1020 | } | |
1021 | ||
5c5c0234 | 1022 | |
5c5c0234 S |
1023 | static int storvsc_remove(struct hv_device *dev) |
1024 | { | |
5c5c0234 S |
1025 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
1026 | struct hv_host_device *host_dev = | |
1027 | (struct hv_host_device *)host->hostdata; | |
1028 | ||
2935a407 S |
1029 | scsi_remove_host(host); |
1030 | ||
2935a407 | 1031 | scsi_host_put(host); |
d36b0a03 | 1032 | |
6cdc57c0 | 1033 | storvsc_dev_remove(dev); |
5c5c0234 S |
1034 | if (host_dev->request_pool) { |
1035 | kmem_cache_destroy(host_dev->request_pool); | |
1036 | host_dev->request_pool = NULL; | |
1037 | } | |
5c5c0234 S |
1038 | return 0; |
1039 | } | |
1040 | ||
62838ce2 S |
1041 | |
1042 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
1043 | sector_t capacity, int *info) | |
1044 | { | |
5326fd5c S |
1045 | sector_t nsect = capacity; |
1046 | sector_t cylinders = nsect; | |
1047 | int heads, sectors_pt; | |
62838ce2 | 1048 | |
5326fd5c S |
1049 | /* |
1050 | * We are making up these values; let us keep it simple. | |
1051 | */ | |
1052 | heads = 0xff; | |
1053 | sectors_pt = 0x3f; /* Sectors per track */ | |
1054 | sector_div(cylinders, heads * sectors_pt); | |
1055 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1056 | cylinders = 0xffff; | |
62838ce2 S |
1057 | |
1058 | info[0] = heads; | |
5326fd5c S |
1059 | info[1] = sectors_pt; |
1060 | info[2] = (int)cylinders; | |
62838ce2 | 1061 | |
62838ce2 S |
1062 | return 0; |
1063 | } | |
aa3d789e S |
1064 | |
1065 | static int storvsc_host_reset(struct hv_device *device) | |
1066 | { | |
1067 | struct storvsc_device *stor_device; | |
1068 | struct hv_storvsc_request *request; | |
1069 | struct vstor_packet *vstor_packet; | |
1070 | int ret, t; | |
1071 | ||
aa3d789e | 1072 | |
1eaaddf9 | 1073 | stor_device = get_out_stor_device(device); |
aa3d789e | 1074 | if (!stor_device) |
f3b74165 | 1075 | return -ENODEV; |
aa3d789e S |
1076 | |
1077 | request = &stor_device->reset_request; | |
1078 | vstor_packet = &request->vstor_packet; | |
1079 | ||
1080 | init_completion(&request->wait_event); | |
1081 | ||
1082 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1083 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1084 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1085 | ||
1086 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1087 | sizeof(struct vstor_packet), | |
1088 | (unsigned long)&stor_device->reset_request, | |
1089 | VM_PKT_DATA_INBAND, | |
1090 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1091 | if (ret != 0) | |
1092 | goto cleanup; | |
1093 | ||
46d2eb6d | 1094 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
1095 | if (t == 0) { |
1096 | ret = -ETIMEDOUT; | |
1097 | goto cleanup; | |
1098 | } | |
1099 | ||
aa3d789e S |
1100 | |
1101 | /* | |
1102 | * At this point, all outstanding requests in the adapter | |
1103 | * should have been flushed out and return to us | |
1104 | */ | |
1105 | ||
1106 | cleanup: | |
aa3d789e S |
1107 | return ret; |
1108 | } | |
1109 | ||
1110 | ||
96e690be S |
1111 | /* |
1112 | * storvsc_host_reset_handler - Reset the scsi HBA | |
1113 | */ | |
1114 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
1115 | { | |
1116 | int ret; | |
1117 | struct hv_host_device *host_dev = | |
1118 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1119 | struct hv_device *dev = host_dev->dev; | |
1120 | ||
96e690be S |
1121 | ret = storvsc_host_reset(dev); |
1122 | if (ret != 0) | |
1123 | return ret; | |
1124 | ||
96e690be S |
1125 | return ret; |
1126 | } | |
1127 | ||
8a411bad S |
1128 | |
1129 | /* | |
b8de73df | 1130 | * storvsc_command_completion - Command completion processing |
8a411bad | 1131 | */ |
b8de73df | 1132 | static void storvsc_command_completion(struct hv_storvsc_request *request) |
8a411bad S |
1133 | { |
1134 | struct storvsc_cmd_request *cmd_request = | |
1135 | (struct storvsc_cmd_request *)request->context; | |
1136 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
1137 | struct hv_host_device *host_dev = | |
1138 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1139 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
1140 | struct scsi_sense_hdr sense_hdr; | |
1141 | struct vmscsi_request *vm_srb; | |
1142 | ||
3612ef99 | 1143 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1144 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
1145 | if (vm_srb->data_in == READ_TYPE) { |
1146 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
1147 | cmd_request->bounce_sgl, |
1148 | scsi_sg_count(scmnd)); | |
3612ef99 S |
1149 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
1150 | cmd_request->bounce_sgl_count); | |
1151 | } | |
8a411bad S |
1152 | } |
1153 | ||
2544b794 S |
1154 | /* |
1155 | * If there is an error; offline the device since all | |
1156 | * error recovery strategies would have already been | |
1157 | * deployed on the host side. | |
1158 | */ | |
1159 | if (vm_srb->srb_status == 0x4) | |
1160 | scmnd->result = DID_TARGET_FAILURE << 16; | |
1161 | else | |
1162 | scmnd->result = vm_srb->scsi_status; | |
8a411bad S |
1163 | |
1164 | if (scmnd->result) { | |
1165 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1166 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1167 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1168 | } | |
1169 | ||
8a411bad S |
1170 | scsi_set_resid(scmnd, |
1171 | request->data_buffer.len - | |
1172 | vm_srb->data_transfer_length); | |
1173 | ||
1174 | scsi_done_fn = scmnd->scsi_done; | |
1175 | ||
1176 | scmnd->host_scribble = NULL; | |
1177 | scmnd->scsi_done = NULL; | |
1178 | ||
8a411bad S |
1179 | scsi_done_fn(scmnd); |
1180 | ||
1181 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1182 | } | |
1183 | ||
c5b463ae S |
1184 | |
1185 | /* | |
1186 | * storvsc_queuecommand - Initiate command processing | |
1187 | */ | |
1188 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
1189 | void (*done)(struct scsi_cmnd *)) | |
1190 | { | |
1191 | int ret; | |
1192 | struct hv_host_device *host_dev = | |
1193 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1194 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
1195 | struct hv_storvsc_request *request; |
1196 | struct storvsc_cmd_request *cmd_request; | |
1197 | unsigned int request_size = 0; | |
1198 | int i; | |
1199 | struct scatterlist *sgl; | |
1200 | unsigned int sg_count = 0; | |
1201 | struct vmscsi_request *vm_srb; | |
1202 | ||
1203 | ||
1204 | /* If retrying, no need to prep the cmd */ | |
1205 | if (scmnd->host_scribble) { | |
c5b463ae S |
1206 | |
1207 | cmd_request = | |
1208 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
1209 | |
1210 | goto retry_request; | |
1211 | } | |
1212 | ||
c5b463ae S |
1213 | scmnd->scsi_done = done; |
1214 | ||
1215 | request_size = sizeof(struct storvsc_cmd_request); | |
1216 | ||
1217 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
1218 | GFP_ATOMIC); | |
1219 | if (!cmd_request) { | |
1220 | scmnd->scsi_done = NULL; | |
1221 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
1222 | } | |
1223 | ||
1224 | /* Setup the cmd request */ | |
1225 | cmd_request->bounce_sgl_count = 0; | |
1226 | cmd_request->bounce_sgl = NULL; | |
1227 | cmd_request->cmd = scmnd; | |
1228 | ||
1229 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1230 | ||
1231 | request = &cmd_request->request; | |
1232 | vm_srb = &request->vstor_packet.vm_srb; | |
1233 | ||
1234 | ||
1235 | /* Build the SRB */ | |
1236 | switch (scmnd->sc_data_direction) { | |
1237 | case DMA_TO_DEVICE: | |
1238 | vm_srb->data_in = WRITE_TYPE; | |
1239 | break; | |
1240 | case DMA_FROM_DEVICE: | |
1241 | vm_srb->data_in = READ_TYPE; | |
1242 | break; | |
1243 | default: | |
1244 | vm_srb->data_in = UNKNOWN_TYPE; | |
1245 | break; | |
1246 | } | |
1247 | ||
b8de73df | 1248 | request->on_io_completion = storvsc_command_completion; |
c5b463ae S |
1249 | request->context = cmd_request;/* scmnd; */ |
1250 | ||
c5b463ae S |
1251 | vm_srb->port_number = host_dev->port; |
1252 | vm_srb->path_id = scmnd->device->channel; | |
1253 | vm_srb->target_id = scmnd->device->id; | |
1254 | vm_srb->lun = scmnd->device->lun; | |
1255 | ||
c5b463ae S |
1256 | vm_srb->cdb_length = scmnd->cmd_len; |
1257 | ||
1258 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1259 | ||
1260 | request->sense_buffer = scmnd->sense_buffer; | |
1261 | ||
1262 | ||
1263 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1264 | if (scsi_sg_count(scmnd)) { | |
1265 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1266 | sg_count = scsi_sg_count(scmnd); | |
1267 | ||
1268 | /* check if we need to bounce the sgl */ | |
1269 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1270 | cmd_request->bounce_sgl = | |
1271 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
1272 | scsi_bufflen(scmnd)); | |
1273 | if (!cmd_request->bounce_sgl) { | |
1274 | scmnd->scsi_done = NULL; | |
1275 | scmnd->host_scribble = NULL; | |
1276 | kmem_cache_free(host_dev->request_pool, | |
1277 | cmd_request); | |
1278 | ||
1279 | return SCSI_MLQUEUE_HOST_BUSY; | |
1280 | } | |
1281 | ||
1282 | cmd_request->bounce_sgl_count = | |
1283 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1284 | PAGE_SHIFT; | |
1285 | ||
fa23b8c7 S |
1286 | if (vm_srb->data_in == WRITE_TYPE) |
1287 | copy_to_bounce_buffer(sgl, | |
1288 | cmd_request->bounce_sgl, | |
1289 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1290 | |
1291 | sgl = cmd_request->bounce_sgl; | |
1292 | sg_count = cmd_request->bounce_sgl_count; | |
1293 | } | |
1294 | ||
1295 | request->data_buffer.offset = sgl[0].offset; | |
1296 | ||
1297 | for (i = 0; i < sg_count; i++) | |
1298 | request->data_buffer.pfn_array[i] = | |
1299 | page_to_pfn(sg_page((&sgl[i]))); | |
1300 | ||
1301 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1302 | request->data_buffer.offset = |
1303 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1304 | request->data_buffer.pfn_array[0] = | |
1305 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1306 | } | |
1307 | ||
1308 | retry_request: | |
1309 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1310 | ret = storvsc_do_io(dev, &cmd_request->request); |
1311 | ||
d2598f01 | 1312 | if (ret == -EAGAIN) { |
c5b463ae S |
1313 | /* no more space */ |
1314 | ||
70691ec6 | 1315 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1316 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1317 | cmd_request->bounce_sgl_count); |
c5b463ae S |
1318 | |
1319 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1320 | ||
1321 | scmnd->scsi_done = NULL; | |
1322 | scmnd->host_scribble = NULL; | |
1323 | ||
1324 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1325 | } | |
1326 | ||
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
1331 | ||
bef4a34a | 1332 | |
454f18a9 | 1333 | /* Scsi driver */ |
bef4a34a | 1334 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1335 | .module = THIS_MODULE, |
1336 | .name = "storvsc_host_t", | |
1337 | .bios_param = storvsc_get_chs, | |
1338 | .queuecommand = storvsc_queuecommand, | |
1339 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1340 | .slave_alloc = storvsc_device_alloc, | |
1341 | .slave_configure = storvsc_device_configure, | |
1342 | .cmd_per_lun = 1, | |
1343 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1344 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1345 | .this_id = -1, |
454f18a9 | 1346 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1347 | /* currently 32 */ |
1348 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1349 | /* | |
1350 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1351 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1352 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1353 | * multiple | |
1354 | */ | |
454f18a9 | 1355 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1356 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1357 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1358 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1359 | }; |
1360 | ||
21e37742 S |
1361 | /* |
1362 | * The storvsc_probe function assumes that the IDE guid | |
1363 | * is the second entry. | |
1364 | */ | |
d847b5fe | 1365 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1366 | /* SCSI guid */ |
1367 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
1368 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) }, | |
21e37742 S |
1369 | /* IDE guid */ |
1370 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
1371 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) }, | |
c45cf2d4 | 1372 | { }, |
d847b5fe | 1373 | }; |
bef4a34a | 1374 | |
d847b5fe | 1375 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1376 | |
bd1f5d6a | 1377 | |
3e189519 | 1378 | /* |
ff568d3a GKH |
1379 | * storvsc_probe - Add a new device for this driver |
1380 | */ | |
f5c78872 | 1381 | |
9efd21e1 | 1382 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 1383 | { |
ff568d3a | 1384 | int ret; |
bef4a34a | 1385 | struct Scsi_Host *host; |
795b613d | 1386 | struct hv_host_device *host_dev; |
9f0c7d2c | 1387 | struct storvsc_device_info device_info; |
bd1f5d6a S |
1388 | bool dev_is_ide; |
1389 | int path = 0; | |
1390 | int target = 0; | |
1391 | ||
21e37742 | 1392 | if (!memcmp(&device->dev_type.b, id_table[1].guid, sizeof(uuid_le))) |
bd1f5d6a S |
1393 | dev_is_ide = true; |
1394 | else | |
1395 | dev_is_ide = false; | |
bef4a34a | 1396 | |
ff568d3a | 1397 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1398 | sizeof(struct hv_host_device)); |
f8feed06 | 1399 | if (!host) |
bef4a34a | 1400 | return -ENOMEM; |
bef4a34a | 1401 | |
9efd21e1 | 1402 | dev_set_drvdata(&device->device, host); |
bef4a34a | 1403 | |
795b613d S |
1404 | host_dev = (struct hv_host_device *)host->hostdata; |
1405 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 1406 | |
795b613d | 1407 | host_dev->port = host->host_no; |
97c15296 | 1408 | host_dev->dev = device; |
bef4a34a | 1409 | |
795b613d | 1410 | host_dev->request_pool = |
9efd21e1 | 1411 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1412 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1413 | SLAB_HWCACHE_ALIGN, NULL); |
1414 | ||
795b613d | 1415 | if (!host_dev->request_pool) { |
bef4a34a | 1416 | scsi_host_put(host); |
bef4a34a HJ |
1417 | return -ENOMEM; |
1418 | } | |
1419 | ||
8a046024 | 1420 | device_info.port_number = host->host_no; |
fa4d123a | 1421 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 1422 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 1423 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 1424 | |
ff568d3a | 1425 | if (ret != 0) { |
795b613d | 1426 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 1427 | scsi_host_put(host); |
8e854680 | 1428 | return -ENODEV; |
bef4a34a HJ |
1429 | } |
1430 | ||
bd1f5d6a S |
1431 | if (dev_is_ide) |
1432 | storvsc_get_ide_info(device, &target, &path); | |
1433 | ||
795b613d S |
1434 | host_dev->path = device_info.path_id; |
1435 | host_dev->target = device_info.target_id; | |
bef4a34a | 1436 | |
ff568d3a GKH |
1437 | /* max # of devices per target */ |
1438 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1439 | /* max # of targets per channel */ | |
1440 | host->max_id = STORVSC_MAX_TARGETS; | |
1441 | /* max # of channels */ | |
1442 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 1443 | |
454f18a9 | 1444 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1445 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a S |
1446 | if (ret != 0) |
1447 | goto err_out; | |
bef4a34a | 1448 | |
bd1f5d6a S |
1449 | if (!dev_is_ide) { |
1450 | scsi_scan_host(host); | |
1451 | return 0; | |
1452 | } | |
1453 | ret = scsi_add_device(host, 0, target, 0); | |
1454 | if (ret) { | |
1455 | scsi_remove_host(host); | |
1456 | goto err_out; | |
bef4a34a | 1457 | } |
bd1f5d6a | 1458 | return 0; |
bef4a34a | 1459 | |
bd1f5d6a S |
1460 | err_out: |
1461 | storvsc_dev_remove(device); | |
1462 | kmem_cache_destroy(host_dev->request_pool); | |
1463 | scsi_host_put(host); | |
1464 | return -ENODEV; | |
bef4a34a HJ |
1465 | } |
1466 | ||
7bd05b91 S |
1467 | /* The one and only one */ |
1468 | ||
40bf63ed | 1469 | static struct hv_driver storvsc_drv = { |
768fa219 | 1470 | .name = "storvsc", |
d847b5fe | 1471 | .id_table = id_table, |
40bf63ed S |
1472 | .probe = storvsc_probe, |
1473 | .remove = storvsc_remove, | |
39ae6fae | 1474 | }; |
7bd05b91 | 1475 | |
d9bbae83 | 1476 | static int __init storvsc_drv_init(void) |
f5c78872 | 1477 | { |
01415ab3 S |
1478 | u32 max_outstanding_req_per_channel; |
1479 | ||
1480 | /* | |
1481 | * Divide the ring buffer data size (which is 1 page less | |
1482 | * than the ring buffer size since that page is reserved for | |
1483 | * the ring buffer indices) by the max request size (which is | |
1484 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1485 | */ | |
01415ab3 | 1486 | max_outstanding_req_per_channel = |
768fa219 GKH |
1487 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1488 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1489 | sizeof(struct vstor_packet) + sizeof(u64), | |
1490 | sizeof(u64))); | |
f5c78872 | 1491 | |
01415ab3 | 1492 | if (max_outstanding_req_per_channel < |
f5c78872 | 1493 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1494 | return -EINVAL; |
f5c78872 | 1495 | |
768fa219 | 1496 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1497 | } |
1498 | ||
c63ba9e1 | 1499 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1500 | { |
768fa219 | 1501 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1502 | } |
1503 | ||
ff568d3a | 1504 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1505 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1506 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1507 | module_init(storvsc_drv_init); |
c63ba9e1 | 1508 | module_exit(storvsc_drv_exit); |