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; | |
355 | unsigned long flags; | |
356 | ||
357 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
358 | stor_device = (struct storvsc_device *)device->ext; | |
359 | ||
360 | if (!stor_device) | |
361 | goto get_in_err; | |
362 | ||
363 | /* | |
364 | * If the device is being destroyed; allow incoming | |
365 | * traffic only to cleanup outstanding requests. | |
366 | */ | |
367 | ||
368 | if (stor_device->destroy && | |
369 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
370 | stor_device = NULL; | |
371 | ||
372 | get_in_err: | |
373 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
374 | return stor_device; | |
375 | ||
376 | } | |
377 | ||
378 | static int storvsc_channel_init(struct hv_device *device) | |
379 | { | |
380 | struct storvsc_device *stor_device; | |
381 | struct hv_storvsc_request *request; | |
382 | struct vstor_packet *vstor_packet; | |
383 | int ret, t; | |
384 | ||
385 | stor_device = get_out_stor_device(device); | |
386 | if (!stor_device) | |
387 | return -ENODEV; | |
388 | ||
389 | request = &stor_device->init_request; | |
390 | vstor_packet = &request->vstor_packet; | |
391 | ||
392 | /* | |
393 | * Now, initiate the vsc/vsp initialization protocol on the open | |
394 | * channel | |
395 | */ | |
396 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
397 | init_completion(&request->wait_event); | |
398 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
399 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
400 | ||
401 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
402 | sizeof(struct vstor_packet), | |
403 | (unsigned long)request, | |
404 | VM_PKT_DATA_INBAND, | |
405 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
406 | if (ret != 0) | |
407 | goto cleanup; | |
408 | ||
409 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
410 | if (t == 0) { | |
411 | ret = -ETIMEDOUT; | |
412 | goto cleanup; | |
413 | } | |
414 | ||
415 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
416 | vstor_packet->status != 0) | |
417 | goto cleanup; | |
418 | ||
419 | ||
420 | /* reuse the packet for version range supported */ | |
421 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
422 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
423 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
424 | ||
425 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
426 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
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 | if (ret != 0) | |
434 | goto cleanup; | |
435 | ||
436 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
437 | if (t == 0) { | |
438 | ret = -ETIMEDOUT; | |
439 | goto cleanup; | |
440 | } | |
441 | ||
442 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
443 | vstor_packet->status != 0) | |
444 | goto cleanup; | |
445 | ||
446 | ||
447 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
448 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
449 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
450 | vstor_packet->storage_channel_properties.port_number = | |
451 | stor_device->port_number; | |
452 | ||
453 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
454 | sizeof(struct vstor_packet), | |
455 | (unsigned long)request, | |
456 | VM_PKT_DATA_INBAND, | |
457 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
458 | ||
459 | if (ret != 0) | |
460 | goto cleanup; | |
461 | ||
462 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
463 | if (t == 0) { | |
464 | ret = -ETIMEDOUT; | |
465 | goto cleanup; | |
466 | } | |
467 | ||
468 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
469 | vstor_packet->status != 0) | |
470 | goto cleanup; | |
471 | ||
472 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
473 | stor_device->target_id | |
474 | = vstor_packet->storage_channel_properties.target_id; | |
475 | ||
476 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
477 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
478 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
479 | ||
480 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
481 | sizeof(struct vstor_packet), | |
482 | (unsigned long)request, | |
483 | VM_PKT_DATA_INBAND, | |
484 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
485 | ||
486 | if (ret != 0) | |
487 | goto cleanup; | |
488 | ||
489 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
490 | if (t == 0) { | |
491 | ret = -ETIMEDOUT; | |
492 | goto cleanup; | |
493 | } | |
494 | ||
495 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
496 | vstor_packet->status != 0) | |
497 | goto cleanup; | |
498 | ||
499 | ||
500 | cleanup: | |
501 | return ret; | |
502 | } | |
503 | ||
504 | static void storvsc_on_io_completion(struct hv_device *device, | |
505 | struct vstor_packet *vstor_packet, | |
506 | struct hv_storvsc_request *request) | |
507 | { | |
508 | struct storvsc_device *stor_device; | |
509 | struct vstor_packet *stor_pkt; | |
510 | ||
511 | stor_device = (struct storvsc_device *)device->ext; | |
512 | ||
513 | stor_pkt = &request->vstor_packet; | |
514 | ||
515 | ||
516 | /* Copy over the status...etc */ | |
517 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
518 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
519 | stor_pkt->vm_srb.sense_info_length = | |
520 | vstor_packet->vm_srb.sense_info_length; | |
521 | ||
522 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
523 | vstor_packet->vm_srb.srb_status != 1){ | |
524 | DPRINT_WARN(STORVSC, | |
525 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
526 | stor_pkt->vm_srb.cdb[0], | |
527 | vstor_packet->vm_srb.scsi_status, | |
528 | vstor_packet->vm_srb.srb_status); | |
529 | } | |
530 | ||
531 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
532 | /* CHECK_CONDITION */ | |
533 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
534 | /* autosense data available */ | |
535 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
536 | "valid - len %d\n", request, | |
537 | vstor_packet->vm_srb.sense_info_length); | |
538 | ||
539 | memcpy(request->sense_buffer, | |
540 | vstor_packet->vm_srb.sense_data, | |
541 | vstor_packet->vm_srb.sense_info_length); | |
542 | ||
543 | } | |
544 | } | |
545 | ||
546 | stor_pkt->vm_srb.data_transfer_length = | |
547 | vstor_packet->vm_srb.data_transfer_length; | |
548 | ||
549 | request->on_io_completion(request); | |
550 | ||
551 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
552 | stor_device->drain_notify) | |
553 | wake_up(&stor_device->waiting_to_drain); | |
554 | ||
555 | ||
556 | } | |
557 | ||
558 | static void storvsc_on_receive(struct hv_device *device, | |
559 | struct vstor_packet *vstor_packet, | |
560 | struct hv_storvsc_request *request) | |
561 | { | |
562 | switch (vstor_packet->operation) { | |
563 | case VSTOR_OPERATION_COMPLETE_IO: | |
564 | storvsc_on_io_completion(device, vstor_packet, request); | |
565 | break; | |
566 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
567 | ||
568 | default: | |
569 | break; | |
570 | } | |
571 | } | |
572 | ||
573 | static void storvsc_on_channel_callback(void *context) | |
574 | { | |
575 | struct hv_device *device = (struct hv_device *)context; | |
576 | struct storvsc_device *stor_device; | |
577 | u32 bytes_recvd; | |
578 | u64 request_id; | |
579 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
580 | struct hv_storvsc_request *request; | |
581 | int ret; | |
582 | ||
583 | ||
584 | stor_device = get_in_stor_device(device); | |
585 | if (!stor_device) | |
586 | return; | |
587 | ||
588 | do { | |
589 | ret = vmbus_recvpacket(device->channel, packet, | |
590 | ALIGN(sizeof(struct vstor_packet), 8), | |
591 | &bytes_recvd, &request_id); | |
592 | if (ret == 0 && bytes_recvd > 0) { | |
593 | ||
594 | request = (struct hv_storvsc_request *) | |
595 | (unsigned long)request_id; | |
596 | ||
597 | if ((request == &stor_device->init_request) || | |
598 | (request == &stor_device->reset_request)) { | |
599 | ||
600 | memcpy(&request->vstor_packet, packet, | |
601 | sizeof(struct vstor_packet)); | |
602 | complete(&request->wait_event); | |
603 | } else { | |
604 | storvsc_on_receive(device, | |
605 | (struct vstor_packet *)packet, | |
606 | request); | |
607 | } | |
608 | } else { | |
609 | break; | |
610 | } | |
611 | } while (1); | |
612 | ||
613 | return; | |
614 | } | |
615 | ||
616 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
617 | { | |
618 | struct vmstorage_channel_properties props; | |
619 | int ret; | |
620 | ||
621 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
622 | ||
623 | /* Open the channel */ | |
624 | ret = vmbus_open(device->channel, | |
625 | ring_size, | |
626 | ring_size, | |
627 | (void *)&props, | |
628 | sizeof(struct vmstorage_channel_properties), | |
629 | storvsc_on_channel_callback, device); | |
630 | ||
631 | if (ret != 0) | |
632 | return ret; | |
633 | ||
634 | ret = storvsc_channel_init(device); | |
635 | ||
636 | return ret; | |
637 | } | |
638 | ||
c1b3d067 | 639 | static int storvsc_dev_add(struct hv_device *device, |
8dcf37d4 S |
640 | void *additional_info) |
641 | { | |
642 | struct storvsc_device *stor_device; | |
643 | struct storvsc_device_info *device_info; | |
644 | int ret = 0; | |
645 | ||
646 | device_info = (struct storvsc_device_info *)additional_info; | |
647 | stor_device = alloc_stor_device(device); | |
648 | if (!stor_device) | |
649 | return -ENOMEM; | |
650 | ||
651 | /* Save the channel properties to our storvsc channel */ | |
652 | ||
653 | /* | |
654 | * If we support more than 1 scsi channel, we need to set the | |
655 | * port number here to the scsi channel but how do we get the | |
656 | * scsi channel prior to the bus scan. | |
657 | * | |
658 | * The host does not support this. | |
659 | */ | |
660 | ||
661 | stor_device->port_number = device_info->port_number; | |
662 | /* Send it back up */ | |
663 | ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); | |
664 | if (ret) { | |
665 | kfree(stor_device); | |
666 | return ret; | |
667 | } | |
668 | device_info->path_id = stor_device->path_id; | |
669 | device_info->target_id = stor_device->target_id; | |
670 | ||
671 | return ret; | |
672 | } | |
673 | ||
c1b3d067 | 674 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
675 | { |
676 | struct storvsc_device *stor_device; | |
677 | unsigned long flags; | |
678 | ||
679 | stor_device = (struct storvsc_device *)device->ext; | |
680 | ||
681 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
682 | stor_device->destroy = true; | |
683 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
684 | ||
685 | /* | |
686 | * At this point, all outbound traffic should be disable. We | |
687 | * only allow inbound traffic (responses) to proceed so that | |
688 | * outstanding requests can be completed. | |
689 | */ | |
690 | ||
691 | storvsc_wait_to_drain(stor_device); | |
692 | ||
693 | /* | |
694 | * Since we have already drained, we don't need to busy wait | |
695 | * as was done in final_release_stor_device() | |
696 | * Note that we cannot set the ext pointer to NULL until | |
697 | * we have drained - to drain the outgoing packets, we need to | |
698 | * allow incoming packets. | |
699 | */ | |
700 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
701 | device->ext = NULL; | |
702 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
703 | ||
704 | /* Close the channel */ | |
705 | vmbus_close(device->channel); | |
706 | ||
707 | kfree(stor_device); | |
708 | return 0; | |
709 | } | |
710 | ||
c1b3d067 | 711 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
712 | struct hv_storvsc_request *request) |
713 | { | |
714 | struct storvsc_device *stor_device; | |
715 | struct vstor_packet *vstor_packet; | |
716 | int ret = 0; | |
717 | ||
718 | vstor_packet = &request->vstor_packet; | |
719 | stor_device = get_out_stor_device(device); | |
720 | ||
721 | if (!stor_device) | |
722 | return -ENODEV; | |
723 | ||
724 | ||
725 | request->device = device; | |
726 | ||
727 | ||
728 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
729 | ||
730 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
731 | ||
732 | ||
733 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
734 | ||
735 | ||
736 | vstor_packet->vm_srb.data_transfer_length = | |
737 | request->data_buffer.len; | |
738 | ||
739 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
740 | ||
741 | if (request->data_buffer.len) { | |
742 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
743 | &request->data_buffer, | |
744 | vstor_packet, | |
745 | sizeof(struct vstor_packet), | |
746 | (unsigned long)request); | |
747 | } else { | |
748 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
749 | sizeof(struct vstor_packet), | |
750 | (unsigned long)request, | |
751 | VM_PKT_DATA_INBAND, | |
752 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
753 | } | |
754 | ||
755 | if (ret != 0) | |
756 | return ret; | |
757 | ||
758 | atomic_inc(&stor_device->num_outstanding_req); | |
759 | ||
760 | return ret; | |
761 | } | |
762 | ||
bd1f5d6a S |
763 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
764 | { | |
765 | *target = | |
766 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
767 | ||
768 | *path = | |
769 | dev->dev_instance.b[3] << 24 | | |
770 | dev->dev_instance.b[2] << 16 | | |
771 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
772 | } | |
773 | ||
bef4a34a | 774 | |
5b60acee S |
775 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
776 | { | |
777 | /* | |
778 | * This enables luns to be located sparsely. Otherwise, we may not | |
779 | * discovered them. | |
780 | */ | |
781 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
782 | return 0; | |
783 | } | |
784 | ||
a1ebfeae S |
785 | static int storvsc_merge_bvec(struct request_queue *q, |
786 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
787 | { | |
788 | /* checking done by caller. */ | |
789 | return bvec->bv_len; | |
790 | } | |
791 | ||
419f2d03 S |
792 | static int storvsc_device_configure(struct scsi_device *sdevice) |
793 | { | |
794 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
795 | STORVSC_MAX_IO_REQUESTS); | |
796 | ||
419f2d03 S |
797 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
798 | ||
419f2d03 S |
799 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
800 | ||
801 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
802 | |
803 | return 0; | |
804 | } | |
805 | ||
49a3c7a9 S |
806 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
807 | unsigned int sg_count) | |
808 | { | |
809 | int i; | |
810 | struct page *page_buf; | |
811 | ||
812 | for (i = 0; i < sg_count; i++) { | |
813 | page_buf = sg_page((&sgl[i])); | |
814 | if (page_buf != NULL) | |
815 | __free_page(page_buf); | |
816 | } | |
817 | ||
818 | kfree(sgl); | |
819 | } | |
820 | ||
3862ef3e S |
821 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
822 | { | |
823 | int i; | |
824 | ||
825 | /* No need to check */ | |
826 | if (sg_count < 2) | |
827 | return -1; | |
828 | ||
829 | /* We have at least 2 sg entries */ | |
830 | for (i = 0; i < sg_count; i++) { | |
831 | if (i == 0) { | |
832 | /* make sure 1st one does not have hole */ | |
833 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
834 | return i; | |
835 | } else if (i == sg_count - 1) { | |
836 | /* make sure last one does not have hole */ | |
837 | if (sgl[i].offset != 0) | |
838 | return i; | |
839 | } else { | |
840 | /* make sure no hole in the middle */ | |
841 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
842 | return i; | |
843 | } | |
844 | } | |
845 | return -1; | |
846 | } | |
847 | ||
a9753cbd S |
848 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
849 | unsigned int sg_count, | |
850 | unsigned int len) | |
851 | { | |
852 | int i; | |
853 | int num_pages; | |
854 | struct scatterlist *bounce_sgl; | |
855 | struct page *page_buf; | |
856 | ||
857 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
858 | ||
859 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
860 | if (!bounce_sgl) | |
861 | return NULL; | |
862 | ||
863 | for (i = 0; i < num_pages; i++) { | |
864 | page_buf = alloc_page(GFP_ATOMIC); | |
865 | if (!page_buf) | |
866 | goto cleanup; | |
867 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
868 | } | |
869 | ||
870 | return bounce_sgl; | |
871 | ||
872 | cleanup: | |
873 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
874 | return NULL; | |
875 | } | |
876 | ||
29fe2c9b S |
877 | |
878 | /* Assume the original sgl has enough room */ | |
879 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
880 | struct scatterlist *bounce_sgl, | |
881 | unsigned int orig_sgl_count) | |
882 | { | |
883 | int i; | |
884 | int j = 0; | |
885 | unsigned long src, dest; | |
886 | unsigned int srclen, destlen, copylen; | |
887 | unsigned int total_copied = 0; | |
888 | unsigned long bounce_addr = 0; | |
889 | unsigned long dest_addr = 0; | |
890 | unsigned long flags; | |
891 | ||
892 | local_irq_save(flags); | |
893 | ||
894 | for (i = 0; i < orig_sgl_count; i++) { | |
895 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
896 | KM_IRQ0) + orig_sgl[i].offset; | |
897 | dest = dest_addr; | |
898 | destlen = orig_sgl[i].length; | |
899 | ||
900 | if (bounce_addr == 0) | |
901 | bounce_addr = | |
902 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
903 | KM_IRQ0); | |
904 | ||
905 | while (destlen) { | |
906 | src = bounce_addr + bounce_sgl[j].offset; | |
907 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
908 | ||
909 | copylen = min(srclen, destlen); | |
910 | memcpy((void *)dest, (void *)src, copylen); | |
911 | ||
912 | total_copied += copylen; | |
913 | bounce_sgl[j].offset += copylen; | |
914 | destlen -= copylen; | |
915 | dest += copylen; | |
916 | ||
917 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
918 | /* full */ | |
919 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
920 | j++; | |
921 | ||
922 | /* if we need to use another bounce buffer */ | |
923 | if (destlen || i != orig_sgl_count - 1) | |
924 | bounce_addr = | |
925 | (unsigned long)kmap_atomic( | |
926 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
927 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
928 | /* unmap the last bounce that is < PAGE_SIZE */ | |
929 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
930 | } | |
931 | } | |
932 | ||
933 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
934 | KM_IRQ0); | |
935 | } | |
936 | ||
937 | local_irq_restore(flags); | |
938 | ||
939 | return total_copied; | |
940 | } | |
941 | ||
6a8ff44b S |
942 | |
943 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
944 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
945 | struct scatterlist *bounce_sgl, | |
946 | unsigned int orig_sgl_count) | |
947 | { | |
948 | int i; | |
949 | int j = 0; | |
950 | unsigned long src, dest; | |
951 | unsigned int srclen, destlen, copylen; | |
952 | unsigned int total_copied = 0; | |
953 | unsigned long bounce_addr = 0; | |
954 | unsigned long src_addr = 0; | |
955 | unsigned long flags; | |
956 | ||
957 | local_irq_save(flags); | |
958 | ||
959 | for (i = 0; i < orig_sgl_count; i++) { | |
960 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
961 | KM_IRQ0) + orig_sgl[i].offset; | |
962 | src = src_addr; | |
963 | srclen = orig_sgl[i].length; | |
964 | ||
965 | if (bounce_addr == 0) | |
966 | bounce_addr = | |
967 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
968 | KM_IRQ0); | |
969 | ||
970 | while (srclen) { | |
971 | /* assume bounce offset always == 0 */ | |
972 | dest = bounce_addr + bounce_sgl[j].length; | |
973 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
974 | ||
975 | copylen = min(srclen, destlen); | |
976 | memcpy((void *)dest, (void *)src, copylen); | |
977 | ||
978 | total_copied += copylen; | |
979 | bounce_sgl[j].length += copylen; | |
980 | srclen -= copylen; | |
981 | src += copylen; | |
982 | ||
983 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
984 | /* full..move to next entry */ | |
985 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
986 | j++; | |
987 | ||
988 | /* if we need to use another bounce buffer */ | |
989 | if (srclen || i != orig_sgl_count - 1) | |
990 | bounce_addr = | |
991 | (unsigned long)kmap_atomic( | |
992 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
993 | ||
994 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
995 | /* unmap the last bounce that is < PAGE_SIZE */ | |
996 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
997 | } | |
998 | } | |
999 | ||
1000 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
1001 | } | |
1002 | ||
1003 | local_irq_restore(flags); | |
1004 | ||
1005 | return total_copied; | |
1006 | } | |
1007 | ||
5c5c0234 | 1008 | |
5c5c0234 S |
1009 | static int storvsc_remove(struct hv_device *dev) |
1010 | { | |
5c5c0234 S |
1011 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
1012 | struct hv_host_device *host_dev = | |
1013 | (struct hv_host_device *)host->hostdata; | |
1014 | ||
2935a407 S |
1015 | scsi_remove_host(host); |
1016 | ||
2935a407 | 1017 | scsi_host_put(host); |
d36b0a03 | 1018 | |
6cdc57c0 | 1019 | storvsc_dev_remove(dev); |
5c5c0234 S |
1020 | if (host_dev->request_pool) { |
1021 | kmem_cache_destroy(host_dev->request_pool); | |
1022 | host_dev->request_pool = NULL; | |
1023 | } | |
5c5c0234 S |
1024 | return 0; |
1025 | } | |
1026 | ||
62838ce2 S |
1027 | |
1028 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
1029 | sector_t capacity, int *info) | |
1030 | { | |
5326fd5c S |
1031 | sector_t nsect = capacity; |
1032 | sector_t cylinders = nsect; | |
1033 | int heads, sectors_pt; | |
62838ce2 | 1034 | |
5326fd5c S |
1035 | /* |
1036 | * We are making up these values; let us keep it simple. | |
1037 | */ | |
1038 | heads = 0xff; | |
1039 | sectors_pt = 0x3f; /* Sectors per track */ | |
1040 | sector_div(cylinders, heads * sectors_pt); | |
1041 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1042 | cylinders = 0xffff; | |
62838ce2 S |
1043 | |
1044 | info[0] = heads; | |
5326fd5c S |
1045 | info[1] = sectors_pt; |
1046 | info[2] = (int)cylinders; | |
62838ce2 | 1047 | |
62838ce2 S |
1048 | return 0; |
1049 | } | |
aa3d789e S |
1050 | |
1051 | static int storvsc_host_reset(struct hv_device *device) | |
1052 | { | |
1053 | struct storvsc_device *stor_device; | |
1054 | struct hv_storvsc_request *request; | |
1055 | struct vstor_packet *vstor_packet; | |
1056 | int ret, t; | |
1057 | ||
aa3d789e | 1058 | |
1eaaddf9 | 1059 | stor_device = get_out_stor_device(device); |
aa3d789e | 1060 | if (!stor_device) |
f3b74165 | 1061 | return -ENODEV; |
aa3d789e S |
1062 | |
1063 | request = &stor_device->reset_request; | |
1064 | vstor_packet = &request->vstor_packet; | |
1065 | ||
1066 | init_completion(&request->wait_event); | |
1067 | ||
1068 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1069 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1070 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1071 | ||
1072 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1073 | sizeof(struct vstor_packet), | |
1074 | (unsigned long)&stor_device->reset_request, | |
1075 | VM_PKT_DATA_INBAND, | |
1076 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1077 | if (ret != 0) | |
1078 | goto cleanup; | |
1079 | ||
46d2eb6d | 1080 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
1081 | if (t == 0) { |
1082 | ret = -ETIMEDOUT; | |
1083 | goto cleanup; | |
1084 | } | |
1085 | ||
aa3d789e S |
1086 | |
1087 | /* | |
1088 | * At this point, all outstanding requests in the adapter | |
1089 | * should have been flushed out and return to us | |
1090 | */ | |
1091 | ||
1092 | cleanup: | |
aa3d789e S |
1093 | return ret; |
1094 | } | |
1095 | ||
1096 | ||
96e690be S |
1097 | /* |
1098 | * storvsc_host_reset_handler - Reset the scsi HBA | |
1099 | */ | |
1100 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
1101 | { | |
1102 | int ret; | |
1103 | struct hv_host_device *host_dev = | |
1104 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1105 | struct hv_device *dev = host_dev->dev; | |
1106 | ||
96e690be S |
1107 | ret = storvsc_host_reset(dev); |
1108 | if (ret != 0) | |
1109 | return ret; | |
1110 | ||
96e690be S |
1111 | return ret; |
1112 | } | |
1113 | ||
8a411bad S |
1114 | |
1115 | /* | |
1116 | * storvsc_commmand_completion - Command completion processing | |
1117 | */ | |
1118 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
1119 | { | |
1120 | struct storvsc_cmd_request *cmd_request = | |
1121 | (struct storvsc_cmd_request *)request->context; | |
1122 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
1123 | struct hv_host_device *host_dev = | |
1124 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1125 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
1126 | struct scsi_sense_hdr sense_hdr; | |
1127 | struct vmscsi_request *vm_srb; | |
1128 | ||
3612ef99 | 1129 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1130 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
1131 | if (vm_srb->data_in == READ_TYPE) { |
1132 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
1133 | cmd_request->bounce_sgl, |
1134 | scsi_sg_count(scmnd)); | |
3612ef99 S |
1135 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
1136 | cmd_request->bounce_sgl_count); | |
1137 | } | |
8a411bad S |
1138 | } |
1139 | ||
8a411bad S |
1140 | scmnd->result = vm_srb->scsi_status; |
1141 | ||
1142 | if (scmnd->result) { | |
1143 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1144 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1145 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1146 | } | |
1147 | ||
8a411bad S |
1148 | scsi_set_resid(scmnd, |
1149 | request->data_buffer.len - | |
1150 | vm_srb->data_transfer_length); | |
1151 | ||
1152 | scsi_done_fn = scmnd->scsi_done; | |
1153 | ||
1154 | scmnd->host_scribble = NULL; | |
1155 | scmnd->scsi_done = NULL; | |
1156 | ||
8a411bad S |
1157 | scsi_done_fn(scmnd); |
1158 | ||
1159 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1160 | } | |
1161 | ||
c5b463ae S |
1162 | |
1163 | /* | |
1164 | * storvsc_queuecommand - Initiate command processing | |
1165 | */ | |
1166 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
1167 | void (*done)(struct scsi_cmnd *)) | |
1168 | { | |
1169 | int ret; | |
1170 | struct hv_host_device *host_dev = | |
1171 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1172 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
1173 | struct hv_storvsc_request *request; |
1174 | struct storvsc_cmd_request *cmd_request; | |
1175 | unsigned int request_size = 0; | |
1176 | int i; | |
1177 | struct scatterlist *sgl; | |
1178 | unsigned int sg_count = 0; | |
1179 | struct vmscsi_request *vm_srb; | |
1180 | ||
1181 | ||
1182 | /* If retrying, no need to prep the cmd */ | |
1183 | if (scmnd->host_scribble) { | |
c5b463ae S |
1184 | |
1185 | cmd_request = | |
1186 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
1187 | |
1188 | goto retry_request; | |
1189 | } | |
1190 | ||
c5b463ae S |
1191 | scmnd->scsi_done = done; |
1192 | ||
1193 | request_size = sizeof(struct storvsc_cmd_request); | |
1194 | ||
1195 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
1196 | GFP_ATOMIC); | |
1197 | if (!cmd_request) { | |
1198 | scmnd->scsi_done = NULL; | |
1199 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
1200 | } | |
1201 | ||
1202 | /* Setup the cmd request */ | |
1203 | cmd_request->bounce_sgl_count = 0; | |
1204 | cmd_request->bounce_sgl = NULL; | |
1205 | cmd_request->cmd = scmnd; | |
1206 | ||
1207 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1208 | ||
1209 | request = &cmd_request->request; | |
1210 | vm_srb = &request->vstor_packet.vm_srb; | |
1211 | ||
1212 | ||
1213 | /* Build the SRB */ | |
1214 | switch (scmnd->sc_data_direction) { | |
1215 | case DMA_TO_DEVICE: | |
1216 | vm_srb->data_in = WRITE_TYPE; | |
1217 | break; | |
1218 | case DMA_FROM_DEVICE: | |
1219 | vm_srb->data_in = READ_TYPE; | |
1220 | break; | |
1221 | default: | |
1222 | vm_srb->data_in = UNKNOWN_TYPE; | |
1223 | break; | |
1224 | } | |
1225 | ||
1226 | request->on_io_completion = storvsc_commmand_completion; | |
1227 | request->context = cmd_request;/* scmnd; */ | |
1228 | ||
c5b463ae S |
1229 | vm_srb->port_number = host_dev->port; |
1230 | vm_srb->path_id = scmnd->device->channel; | |
1231 | vm_srb->target_id = scmnd->device->id; | |
1232 | vm_srb->lun = scmnd->device->lun; | |
1233 | ||
c5b463ae S |
1234 | vm_srb->cdb_length = scmnd->cmd_len; |
1235 | ||
1236 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1237 | ||
1238 | request->sense_buffer = scmnd->sense_buffer; | |
1239 | ||
1240 | ||
1241 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1242 | if (scsi_sg_count(scmnd)) { | |
1243 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1244 | sg_count = scsi_sg_count(scmnd); | |
1245 | ||
1246 | /* check if we need to bounce the sgl */ | |
1247 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1248 | cmd_request->bounce_sgl = | |
1249 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
1250 | scsi_bufflen(scmnd)); | |
1251 | if (!cmd_request->bounce_sgl) { | |
1252 | scmnd->scsi_done = NULL; | |
1253 | scmnd->host_scribble = NULL; | |
1254 | kmem_cache_free(host_dev->request_pool, | |
1255 | cmd_request); | |
1256 | ||
1257 | return SCSI_MLQUEUE_HOST_BUSY; | |
1258 | } | |
1259 | ||
1260 | cmd_request->bounce_sgl_count = | |
1261 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1262 | PAGE_SHIFT; | |
1263 | ||
fa23b8c7 S |
1264 | if (vm_srb->data_in == WRITE_TYPE) |
1265 | copy_to_bounce_buffer(sgl, | |
1266 | cmd_request->bounce_sgl, | |
1267 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1268 | |
1269 | sgl = cmd_request->bounce_sgl; | |
1270 | sg_count = cmd_request->bounce_sgl_count; | |
1271 | } | |
1272 | ||
1273 | request->data_buffer.offset = sgl[0].offset; | |
1274 | ||
1275 | for (i = 0; i < sg_count; i++) | |
1276 | request->data_buffer.pfn_array[i] = | |
1277 | page_to_pfn(sg_page((&sgl[i]))); | |
1278 | ||
1279 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1280 | request->data_buffer.offset = |
1281 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1282 | request->data_buffer.pfn_array[0] = | |
1283 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1284 | } | |
1285 | ||
1286 | retry_request: | |
1287 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1288 | ret = storvsc_do_io(dev, &cmd_request->request); |
1289 | ||
d2598f01 | 1290 | if (ret == -EAGAIN) { |
c5b463ae S |
1291 | /* no more space */ |
1292 | ||
1293 | if (cmd_request->bounce_sgl_count) { | |
1294 | /* | |
1295 | * FIXME: We can optimize on writes by just skipping | |
1296 | * this | |
1297 | */ | |
1298 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1299 | cmd_request->bounce_sgl, | |
1300 | scsi_sg_count(scmnd)); | |
1301 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1302 | cmd_request->bounce_sgl_count); | |
1303 | } | |
1304 | ||
1305 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1306 | ||
1307 | scmnd->scsi_done = NULL; | |
1308 | scmnd->host_scribble = NULL; | |
1309 | ||
1310 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1311 | } | |
1312 | ||
1313 | return ret; | |
1314 | } | |
1315 | ||
1316 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
1317 | ||
bef4a34a | 1318 | |
454f18a9 | 1319 | /* Scsi driver */ |
bef4a34a | 1320 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1321 | .module = THIS_MODULE, |
1322 | .name = "storvsc_host_t", | |
1323 | .bios_param = storvsc_get_chs, | |
1324 | .queuecommand = storvsc_queuecommand, | |
1325 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1326 | .slave_alloc = storvsc_device_alloc, | |
1327 | .slave_configure = storvsc_device_configure, | |
1328 | .cmd_per_lun = 1, | |
1329 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1330 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1331 | .this_id = -1, |
454f18a9 | 1332 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1333 | /* currently 32 */ |
1334 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1335 | /* | |
1336 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1337 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1338 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1339 | * multiple | |
1340 | */ | |
454f18a9 | 1341 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1342 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1343 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1344 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1345 | }; |
1346 | ||
21e37742 S |
1347 | /* |
1348 | * The storvsc_probe function assumes that the IDE guid | |
1349 | * is the second entry. | |
1350 | */ | |
d847b5fe | 1351 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1352 | /* SCSI guid */ |
1353 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
1354 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) }, | |
21e37742 S |
1355 | /* IDE guid */ |
1356 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
1357 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) }, | |
c45cf2d4 | 1358 | { }, |
d847b5fe | 1359 | }; |
bef4a34a | 1360 | |
d847b5fe | 1361 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1362 | |
bd1f5d6a | 1363 | |
3e189519 | 1364 | /* |
ff568d3a GKH |
1365 | * storvsc_probe - Add a new device for this driver |
1366 | */ | |
f5c78872 | 1367 | |
9efd21e1 | 1368 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 1369 | { |
ff568d3a | 1370 | int ret; |
bef4a34a | 1371 | struct Scsi_Host *host; |
795b613d | 1372 | struct hv_host_device *host_dev; |
9f0c7d2c | 1373 | struct storvsc_device_info device_info; |
bd1f5d6a S |
1374 | bool dev_is_ide; |
1375 | int path = 0; | |
1376 | int target = 0; | |
1377 | ||
21e37742 | 1378 | if (!memcmp(&device->dev_type.b, id_table[1].guid, sizeof(uuid_le))) |
bd1f5d6a S |
1379 | dev_is_ide = true; |
1380 | else | |
1381 | dev_is_ide = false; | |
bef4a34a | 1382 | |
ff568d3a | 1383 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1384 | sizeof(struct hv_host_device)); |
f8feed06 | 1385 | if (!host) |
bef4a34a | 1386 | return -ENOMEM; |
bef4a34a | 1387 | |
9efd21e1 | 1388 | dev_set_drvdata(&device->device, host); |
bef4a34a | 1389 | |
795b613d S |
1390 | host_dev = (struct hv_host_device *)host->hostdata; |
1391 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 1392 | |
795b613d | 1393 | host_dev->port = host->host_no; |
97c15296 | 1394 | host_dev->dev = device; |
bef4a34a | 1395 | |
795b613d | 1396 | host_dev->request_pool = |
9efd21e1 | 1397 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1398 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1399 | SLAB_HWCACHE_ALIGN, NULL); |
1400 | ||
795b613d | 1401 | if (!host_dev->request_pool) { |
bef4a34a | 1402 | scsi_host_put(host); |
bef4a34a HJ |
1403 | return -ENOMEM; |
1404 | } | |
1405 | ||
8a046024 | 1406 | device_info.port_number = host->host_no; |
fa4d123a | 1407 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 1408 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 1409 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 1410 | |
ff568d3a | 1411 | if (ret != 0) { |
795b613d | 1412 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 1413 | scsi_host_put(host); |
8e854680 | 1414 | return -ENODEV; |
bef4a34a HJ |
1415 | } |
1416 | ||
bd1f5d6a S |
1417 | if (dev_is_ide) |
1418 | storvsc_get_ide_info(device, &target, &path); | |
1419 | ||
795b613d S |
1420 | host_dev->path = device_info.path_id; |
1421 | host_dev->target = device_info.target_id; | |
bef4a34a | 1422 | |
ff568d3a GKH |
1423 | /* max # of devices per target */ |
1424 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1425 | /* max # of targets per channel */ | |
1426 | host->max_id = STORVSC_MAX_TARGETS; | |
1427 | /* max # of channels */ | |
1428 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 1429 | |
454f18a9 | 1430 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1431 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a S |
1432 | if (ret != 0) |
1433 | goto err_out; | |
bef4a34a | 1434 | |
bd1f5d6a S |
1435 | if (!dev_is_ide) { |
1436 | scsi_scan_host(host); | |
1437 | return 0; | |
1438 | } | |
1439 | ret = scsi_add_device(host, 0, target, 0); | |
1440 | if (ret) { | |
1441 | scsi_remove_host(host); | |
1442 | goto err_out; | |
bef4a34a | 1443 | } |
bd1f5d6a | 1444 | return 0; |
bef4a34a | 1445 | |
bd1f5d6a S |
1446 | err_out: |
1447 | storvsc_dev_remove(device); | |
1448 | kmem_cache_destroy(host_dev->request_pool); | |
1449 | scsi_host_put(host); | |
1450 | return -ENODEV; | |
bef4a34a HJ |
1451 | } |
1452 | ||
7bd05b91 S |
1453 | /* The one and only one */ |
1454 | ||
40bf63ed | 1455 | static struct hv_driver storvsc_drv = { |
768fa219 | 1456 | .name = "storvsc", |
d847b5fe | 1457 | .id_table = id_table, |
40bf63ed S |
1458 | .probe = storvsc_probe, |
1459 | .remove = storvsc_remove, | |
39ae6fae | 1460 | }; |
7bd05b91 | 1461 | |
d9bbae83 | 1462 | static int __init storvsc_drv_init(void) |
f5c78872 | 1463 | { |
01415ab3 S |
1464 | u32 max_outstanding_req_per_channel; |
1465 | ||
1466 | /* | |
1467 | * Divide the ring buffer data size (which is 1 page less | |
1468 | * than the ring buffer size since that page is reserved for | |
1469 | * the ring buffer indices) by the max request size (which is | |
1470 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1471 | */ | |
01415ab3 | 1472 | max_outstanding_req_per_channel = |
768fa219 GKH |
1473 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1474 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1475 | sizeof(struct vstor_packet) + sizeof(u64), | |
1476 | sizeof(u64))); | |
f5c78872 | 1477 | |
01415ab3 | 1478 | if (max_outstanding_req_per_channel < |
f5c78872 | 1479 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1480 | return -EINVAL; |
f5c78872 | 1481 | |
768fa219 | 1482 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1483 | } |
1484 | ||
c63ba9e1 | 1485 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1486 | { |
768fa219 | 1487 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1488 | } |
1489 | ||
ff568d3a | 1490 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1491 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1492 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1493 | module_init(storvsc_drv_init); |
c63ba9e1 | 1494 | module_exit(storvsc_drv_exit); |