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 S |
44 | |
45 | /* to alert the user that structure sizes may be mismatched even though the */ | |
46 | /* protocol versions match. */ | |
47 | ||
48 | ||
49 | #define REVISION_STRING(REVISION_) #REVISION_ | |
50 | #define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \ | |
51 | do { \ | |
52 | char *revision_string \ | |
53 | = REVISION_STRING($Rev : 6 $) + 6; \ | |
54 | RESULT_LVALUE_ = 0; \ | |
55 | while (*revision_string >= '0' \ | |
56 | && *revision_string <= '9') { \ | |
57 | RESULT_LVALUE_ *= 10; \ | |
58 | RESULT_LVALUE_ += *revision_string - '0'; \ | |
59 | revision_string++; \ | |
60 | } \ | |
61 | } while (0) | |
62 | ||
63 | /* Major/minor macros. Minor version is in LSB, meaning that earlier flat */ | |
64 | /* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */ | |
65 | #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) | |
66 | #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) | |
67 | #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ | |
68 | (((MINOR_) & 0xff))) | |
69 | #define VMSTOR_INVALID_PROTOCOL_VERSION (-1) | |
70 | ||
71 | /* Version history: */ | |
72 | /* V1 Beta 0.1 */ | |
73 | /* V1 RC < 2008/1/31 1.0 */ | |
74 | /* V1 RC > 2008/1/31 2.0 */ | |
75 | #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0) | |
76 | ||
77 | ||
78 | ||
79 | ||
80 | /* This will get replaced with the max transfer length that is possible on */ | |
81 | /* the host adapter. */ | |
82 | /* The max transfer length will be published when we offer a vmbus channel. */ | |
83 | #define MAX_TRANSFER_LENGTH 0x40000 | |
84 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
85 | sizeof(struct vstor_packet) + \ | |
86 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
87 | ||
88 | ||
89 | /* Packet structure describing virtual storage requests. */ | |
90 | enum vstor_packet_operation { | |
91 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
92 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
93 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
94 | VSTOR_OPERATION_RESET_LUN = 4, | |
95 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
96 | VSTOR_OPERATION_RESET_BUS = 6, | |
97 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
98 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
99 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
100 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
101 | VSTOR_OPERATION_MAXIMUM = 10 | |
102 | }; | |
103 | ||
104 | /* | |
105 | * Platform neutral description of a scsi request - | |
106 | * this remains the same across the write regardless of 32/64 bit | |
107 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
108 | */ | |
109 | #define CDB16GENERIC_LENGTH 0x10 | |
110 | ||
111 | #ifndef SENSE_BUFFER_SIZE | |
112 | #define SENSE_BUFFER_SIZE 0x12 | |
113 | #endif | |
114 | ||
115 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
116 | ||
117 | struct vmscsi_request { | |
118 | unsigned short length; | |
119 | unsigned char srb_status; | |
120 | unsigned char scsi_status; | |
121 | ||
122 | unsigned char port_number; | |
123 | unsigned char path_id; | |
124 | unsigned char target_id; | |
125 | unsigned char lun; | |
126 | ||
127 | unsigned char cdb_length; | |
128 | unsigned char sense_info_length; | |
129 | unsigned char data_in; | |
130 | unsigned char reserved; | |
131 | ||
132 | unsigned int data_transfer_length; | |
133 | ||
134 | union { | |
135 | unsigned char cdb[CDB16GENERIC_LENGTH]; | |
136 | unsigned char sense_data[SENSE_BUFFER_SIZE]; | |
137 | unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
138 | }; | |
139 | } __attribute((packed)); | |
140 | ||
141 | ||
142 | /* | |
143 | * This structure is sent during the intialization phase to get the different | |
144 | * properties of the channel. | |
145 | */ | |
146 | struct vmstorage_channel_properties { | |
147 | unsigned short protocol_version; | |
148 | unsigned char path_id; | |
149 | unsigned char target_id; | |
150 | ||
151 | /* Note: port number is only really known on the client side */ | |
152 | unsigned int port_number; | |
153 | unsigned int flags; | |
154 | unsigned int max_transfer_bytes; | |
155 | ||
156 | /* This id is unique for each channel and will correspond with */ | |
157 | /* vendor specific data in the inquirydata */ | |
158 | unsigned long long unique_id; | |
159 | } __packed; | |
160 | ||
161 | /* This structure is sent during the storage protocol negotiations. */ | |
162 | struct vmstorage_protocol_version { | |
163 | /* Major (MSW) and minor (LSW) version numbers. */ | |
164 | unsigned short major_minor; | |
165 | ||
166 | /* | |
167 | * Revision number is auto-incremented whenever this file is changed | |
168 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
169 | * definitely indicate incompatibility--but it does indicate mismatched | |
170 | * builds. | |
171 | */ | |
172 | unsigned short revision; | |
173 | } __packed; | |
174 | ||
175 | /* Channel Property Flags */ | |
176 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
177 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
178 | ||
179 | struct vstor_packet { | |
180 | /* Requested operation type */ | |
181 | enum vstor_packet_operation operation; | |
182 | ||
183 | /* Flags - see below for values */ | |
184 | unsigned int flags; | |
185 | ||
186 | /* Status of the request returned from the server side. */ | |
187 | unsigned int status; | |
188 | ||
189 | /* Data payload area */ | |
190 | union { | |
191 | /* | |
192 | * Structure used to forward SCSI commands from the | |
193 | * client to the server. | |
194 | */ | |
195 | struct vmscsi_request vm_srb; | |
196 | ||
197 | /* Structure used to query channel properties. */ | |
198 | struct vmstorage_channel_properties storage_channel_properties; | |
199 | ||
200 | /* Used during version negotiations. */ | |
201 | struct vmstorage_protocol_version version; | |
202 | }; | |
203 | } __packed; | |
204 | ||
205 | /* Packet flags */ | |
206 | /* | |
207 | * This flag indicates that the server should send back a completion for this | |
208 | * packet. | |
209 | */ | |
210 | #define REQUEST_COMPLETION_FLAG 0x1 | |
211 | ||
212 | /* This is the set of flags that the vsc can set in any packets it sends */ | |
213 | #define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG) | |
214 | ||
215 | ||
216 | /* Defines */ | |
217 | #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) | |
218 | #define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) | |
219 | ||
220 | #define STORVSC_MAX_IO_REQUESTS 128 | |
221 | ||
222 | /* | |
223 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
224 | * reality, the path/target is not used (ie always set to 0) so our | |
225 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
226 | * up to 256 luns. | |
227 | */ | |
228 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
229 | #define STORVSC_MAX_TARGETS 1 | |
230 | #define STORVSC_MAX_CHANNELS 1 | |
231 | ||
232 | struct hv_storvsc_request; | |
233 | ||
234 | /* Matches Windows-end */ | |
235 | enum storvsc_request_type { | |
236 | WRITE_TYPE, | |
237 | READ_TYPE, | |
238 | UNKNOWN_TYPE, | |
239 | }; | |
240 | ||
241 | ||
242 | struct hv_storvsc_request { | |
243 | struct hv_storvsc_request *request; | |
244 | struct hv_device *device; | |
245 | ||
246 | /* Synchronize the request/response if needed */ | |
247 | struct completion wait_event; | |
248 | ||
249 | unsigned char *sense_buffer; | |
250 | void *context; | |
251 | void (*on_io_completion)(struct hv_storvsc_request *request); | |
252 | struct hv_multipage_buffer data_buffer; | |
253 | ||
254 | struct vstor_packet vstor_packet; | |
255 | }; | |
256 | ||
257 | ||
258 | struct storvsc_device_info { | |
259 | u32 ring_buffer_size; | |
260 | unsigned int port_number; | |
261 | unsigned char path_id; | |
262 | unsigned char target_id; | |
263 | }; | |
264 | ||
265 | struct storvsc_major_info { | |
266 | int major; | |
267 | int index; | |
268 | bool do_register; | |
269 | char *devname; | |
270 | char *diskname; | |
271 | }; | |
272 | ||
273 | /* A storvsc device is a device object that contains a vmbus channel */ | |
274 | struct storvsc_device { | |
275 | struct hv_device *device; | |
276 | ||
277 | bool destroy; | |
278 | bool drain_notify; | |
279 | atomic_t num_outstanding_req; | |
280 | ||
281 | wait_queue_head_t waiting_to_drain; | |
282 | ||
283 | /* | |
284 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
285 | * controller. In reality, the pathid, targetid is always 0 | |
286 | * and the port is set by us | |
287 | */ | |
288 | unsigned int port_number; | |
289 | unsigned char path_id; | |
290 | unsigned char target_id; | |
291 | ||
292 | /* Used for vsc/vsp channel reset process */ | |
293 | struct hv_storvsc_request init_request; | |
294 | struct hv_storvsc_request reset_request; | |
295 | }; | |
296 | ||
297 | ||
298 | static inline struct storvsc_device *get_out_stor_device( | |
299 | struct hv_device *device) | |
300 | { | |
301 | struct storvsc_device *stor_device; | |
302 | ||
303 | stor_device = (struct storvsc_device *)device->ext; | |
304 | ||
305 | if (stor_device && stor_device->destroy) | |
306 | stor_device = NULL; | |
307 | ||
308 | return stor_device; | |
309 | } | |
310 | ||
311 | ||
312 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
313 | { | |
314 | dev->drain_notify = true; | |
315 | wait_event(dev->waiting_to_drain, | |
316 | atomic_read(&dev->num_outstanding_req) == 0); | |
317 | dev->drain_notify = false; | |
318 | } | |
bef4a34a | 319 | |
8dcf37d4 | 320 | |
a1be1706 | 321 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
8dcf37d4 | 322 | |
a1be1706 S |
323 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
324 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
8dcf37d4 | 325 | |
a1be1706 S |
326 | struct hv_host_device { |
327 | struct hv_device *dev; | |
328 | struct kmem_cache *request_pool; | |
329 | unsigned int port; | |
330 | unsigned char path; | |
331 | unsigned char target; | |
332 | }; | |
333 | ||
334 | struct storvsc_cmd_request { | |
335 | struct list_head entry; | |
336 | struct scsi_cmnd *cmd; | |
337 | ||
338 | unsigned int bounce_sgl_count; | |
339 | struct scatterlist *bounce_sgl; | |
340 | ||
341 | struct hv_storvsc_request request; | |
342 | }; | |
8dcf37d4 S |
343 | |
344 | static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) | |
345 | { | |
346 | struct storvsc_device *stor_device; | |
347 | ||
348 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); | |
349 | if (!stor_device) | |
350 | return NULL; | |
351 | ||
352 | stor_device->destroy = false; | |
353 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
354 | stor_device->device = device; | |
355 | device->ext = stor_device; | |
356 | ||
357 | return stor_device; | |
358 | } | |
359 | ||
360 | ||
361 | static inline struct storvsc_device *get_in_stor_device( | |
362 | struct hv_device *device) | |
363 | { | |
364 | struct storvsc_device *stor_device; | |
365 | unsigned long flags; | |
366 | ||
367 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
368 | stor_device = (struct storvsc_device *)device->ext; | |
369 | ||
370 | if (!stor_device) | |
371 | goto get_in_err; | |
372 | ||
373 | /* | |
374 | * If the device is being destroyed; allow incoming | |
375 | * traffic only to cleanup outstanding requests. | |
376 | */ | |
377 | ||
378 | if (stor_device->destroy && | |
379 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
380 | stor_device = NULL; | |
381 | ||
382 | get_in_err: | |
383 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
384 | return stor_device; | |
385 | ||
386 | } | |
387 | ||
388 | static int storvsc_channel_init(struct hv_device *device) | |
389 | { | |
390 | struct storvsc_device *stor_device; | |
391 | struct hv_storvsc_request *request; | |
392 | struct vstor_packet *vstor_packet; | |
393 | int ret, t; | |
394 | ||
395 | stor_device = get_out_stor_device(device); | |
396 | if (!stor_device) | |
397 | return -ENODEV; | |
398 | ||
399 | request = &stor_device->init_request; | |
400 | vstor_packet = &request->vstor_packet; | |
401 | ||
402 | /* | |
403 | * Now, initiate the vsc/vsp initialization protocol on the open | |
404 | * channel | |
405 | */ | |
406 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
407 | init_completion(&request->wait_event); | |
408 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
409 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
410 | ||
411 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
412 | sizeof(struct vstor_packet), | |
413 | (unsigned long)request, | |
414 | VM_PKT_DATA_INBAND, | |
415 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
416 | if (ret != 0) | |
417 | goto cleanup; | |
418 | ||
419 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
420 | if (t == 0) { | |
421 | ret = -ETIMEDOUT; | |
422 | goto cleanup; | |
423 | } | |
424 | ||
425 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
426 | vstor_packet->status != 0) | |
427 | goto cleanup; | |
428 | ||
429 | ||
430 | /* reuse the packet for version range supported */ | |
431 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
432 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
433 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
434 | ||
435 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
436 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
437 | ||
438 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
439 | sizeof(struct vstor_packet), | |
440 | (unsigned long)request, | |
441 | VM_PKT_DATA_INBAND, | |
442 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
443 | if (ret != 0) | |
444 | goto cleanup; | |
445 | ||
446 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
447 | if (t == 0) { | |
448 | ret = -ETIMEDOUT; | |
449 | goto cleanup; | |
450 | } | |
451 | ||
452 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
453 | vstor_packet->status != 0) | |
454 | goto cleanup; | |
455 | ||
456 | ||
457 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
458 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
459 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
460 | vstor_packet->storage_channel_properties.port_number = | |
461 | stor_device->port_number; | |
462 | ||
463 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
464 | sizeof(struct vstor_packet), | |
465 | (unsigned long)request, | |
466 | VM_PKT_DATA_INBAND, | |
467 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
468 | ||
469 | if (ret != 0) | |
470 | goto cleanup; | |
471 | ||
472 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
473 | if (t == 0) { | |
474 | ret = -ETIMEDOUT; | |
475 | goto cleanup; | |
476 | } | |
477 | ||
478 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
479 | vstor_packet->status != 0) | |
480 | goto cleanup; | |
481 | ||
482 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
483 | stor_device->target_id | |
484 | = vstor_packet->storage_channel_properties.target_id; | |
485 | ||
486 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
487 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
488 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
489 | ||
490 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
491 | sizeof(struct vstor_packet), | |
492 | (unsigned long)request, | |
493 | VM_PKT_DATA_INBAND, | |
494 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
495 | ||
496 | if (ret != 0) | |
497 | goto cleanup; | |
498 | ||
499 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
500 | if (t == 0) { | |
501 | ret = -ETIMEDOUT; | |
502 | goto cleanup; | |
503 | } | |
504 | ||
505 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
506 | vstor_packet->status != 0) | |
507 | goto cleanup; | |
508 | ||
509 | ||
510 | cleanup: | |
511 | return ret; | |
512 | } | |
513 | ||
514 | static void storvsc_on_io_completion(struct hv_device *device, | |
515 | struct vstor_packet *vstor_packet, | |
516 | struct hv_storvsc_request *request) | |
517 | { | |
518 | struct storvsc_device *stor_device; | |
519 | struct vstor_packet *stor_pkt; | |
520 | ||
521 | stor_device = (struct storvsc_device *)device->ext; | |
522 | ||
523 | stor_pkt = &request->vstor_packet; | |
524 | ||
525 | ||
526 | /* Copy over the status...etc */ | |
527 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
528 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
529 | stor_pkt->vm_srb.sense_info_length = | |
530 | vstor_packet->vm_srb.sense_info_length; | |
531 | ||
532 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
533 | vstor_packet->vm_srb.srb_status != 1){ | |
534 | DPRINT_WARN(STORVSC, | |
535 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
536 | stor_pkt->vm_srb.cdb[0], | |
537 | vstor_packet->vm_srb.scsi_status, | |
538 | vstor_packet->vm_srb.srb_status); | |
539 | } | |
540 | ||
541 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
542 | /* CHECK_CONDITION */ | |
543 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
544 | /* autosense data available */ | |
545 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
546 | "valid - len %d\n", request, | |
547 | vstor_packet->vm_srb.sense_info_length); | |
548 | ||
549 | memcpy(request->sense_buffer, | |
550 | vstor_packet->vm_srb.sense_data, | |
551 | vstor_packet->vm_srb.sense_info_length); | |
552 | ||
553 | } | |
554 | } | |
555 | ||
556 | stor_pkt->vm_srb.data_transfer_length = | |
557 | vstor_packet->vm_srb.data_transfer_length; | |
558 | ||
559 | request->on_io_completion(request); | |
560 | ||
561 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
562 | stor_device->drain_notify) | |
563 | wake_up(&stor_device->waiting_to_drain); | |
564 | ||
565 | ||
566 | } | |
567 | ||
568 | static void storvsc_on_receive(struct hv_device *device, | |
569 | struct vstor_packet *vstor_packet, | |
570 | struct hv_storvsc_request *request) | |
571 | { | |
572 | switch (vstor_packet->operation) { | |
573 | case VSTOR_OPERATION_COMPLETE_IO: | |
574 | storvsc_on_io_completion(device, vstor_packet, request); | |
575 | break; | |
576 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
577 | ||
578 | default: | |
579 | break; | |
580 | } | |
581 | } | |
582 | ||
583 | static void storvsc_on_channel_callback(void *context) | |
584 | { | |
585 | struct hv_device *device = (struct hv_device *)context; | |
586 | struct storvsc_device *stor_device; | |
587 | u32 bytes_recvd; | |
588 | u64 request_id; | |
589 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
590 | struct hv_storvsc_request *request; | |
591 | int ret; | |
592 | ||
593 | ||
594 | stor_device = get_in_stor_device(device); | |
595 | if (!stor_device) | |
596 | return; | |
597 | ||
598 | do { | |
599 | ret = vmbus_recvpacket(device->channel, packet, | |
600 | ALIGN(sizeof(struct vstor_packet), 8), | |
601 | &bytes_recvd, &request_id); | |
602 | if (ret == 0 && bytes_recvd > 0) { | |
603 | ||
604 | request = (struct hv_storvsc_request *) | |
605 | (unsigned long)request_id; | |
606 | ||
607 | if ((request == &stor_device->init_request) || | |
608 | (request == &stor_device->reset_request)) { | |
609 | ||
610 | memcpy(&request->vstor_packet, packet, | |
611 | sizeof(struct vstor_packet)); | |
612 | complete(&request->wait_event); | |
613 | } else { | |
614 | storvsc_on_receive(device, | |
615 | (struct vstor_packet *)packet, | |
616 | request); | |
617 | } | |
618 | } else { | |
619 | break; | |
620 | } | |
621 | } while (1); | |
622 | ||
623 | return; | |
624 | } | |
625 | ||
626 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
627 | { | |
628 | struct vmstorage_channel_properties props; | |
629 | int ret; | |
630 | ||
631 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
632 | ||
633 | /* Open the channel */ | |
634 | ret = vmbus_open(device->channel, | |
635 | ring_size, | |
636 | ring_size, | |
637 | (void *)&props, | |
638 | sizeof(struct vmstorage_channel_properties), | |
639 | storvsc_on_channel_callback, device); | |
640 | ||
641 | if (ret != 0) | |
642 | return ret; | |
643 | ||
644 | ret = storvsc_channel_init(device); | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
649 | int storvsc_dev_add(struct hv_device *device, | |
650 | void *additional_info) | |
651 | { | |
652 | struct storvsc_device *stor_device; | |
653 | struct storvsc_device_info *device_info; | |
654 | int ret = 0; | |
655 | ||
656 | device_info = (struct storvsc_device_info *)additional_info; | |
657 | stor_device = alloc_stor_device(device); | |
658 | if (!stor_device) | |
659 | return -ENOMEM; | |
660 | ||
661 | /* Save the channel properties to our storvsc channel */ | |
662 | ||
663 | /* | |
664 | * If we support more than 1 scsi channel, we need to set the | |
665 | * port number here to the scsi channel but how do we get the | |
666 | * scsi channel prior to the bus scan. | |
667 | * | |
668 | * The host does not support this. | |
669 | */ | |
670 | ||
671 | stor_device->port_number = device_info->port_number; | |
672 | /* Send it back up */ | |
673 | ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); | |
674 | if (ret) { | |
675 | kfree(stor_device); | |
676 | return ret; | |
677 | } | |
678 | device_info->path_id = stor_device->path_id; | |
679 | device_info->target_id = stor_device->target_id; | |
680 | ||
681 | return ret; | |
682 | } | |
683 | ||
684 | int storvsc_dev_remove(struct hv_device *device) | |
685 | { | |
686 | struct storvsc_device *stor_device; | |
687 | unsigned long flags; | |
688 | ||
689 | stor_device = (struct storvsc_device *)device->ext; | |
690 | ||
691 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
692 | stor_device->destroy = true; | |
693 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
694 | ||
695 | /* | |
696 | * At this point, all outbound traffic should be disable. We | |
697 | * only allow inbound traffic (responses) to proceed so that | |
698 | * outstanding requests can be completed. | |
699 | */ | |
700 | ||
701 | storvsc_wait_to_drain(stor_device); | |
702 | ||
703 | /* | |
704 | * Since we have already drained, we don't need to busy wait | |
705 | * as was done in final_release_stor_device() | |
706 | * Note that we cannot set the ext pointer to NULL until | |
707 | * we have drained - to drain the outgoing packets, we need to | |
708 | * allow incoming packets. | |
709 | */ | |
710 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
711 | device->ext = NULL; | |
712 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
713 | ||
714 | /* Close the channel */ | |
715 | vmbus_close(device->channel); | |
716 | ||
717 | kfree(stor_device); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | int storvsc_do_io(struct hv_device *device, | |
722 | struct hv_storvsc_request *request) | |
723 | { | |
724 | struct storvsc_device *stor_device; | |
725 | struct vstor_packet *vstor_packet; | |
726 | int ret = 0; | |
727 | ||
728 | vstor_packet = &request->vstor_packet; | |
729 | stor_device = get_out_stor_device(device); | |
730 | ||
731 | if (!stor_device) | |
732 | return -ENODEV; | |
733 | ||
734 | ||
735 | request->device = device; | |
736 | ||
737 | ||
738 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
739 | ||
740 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
741 | ||
742 | ||
743 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
744 | ||
745 | ||
746 | vstor_packet->vm_srb.data_transfer_length = | |
747 | request->data_buffer.len; | |
748 | ||
749 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
750 | ||
751 | if (request->data_buffer.len) { | |
752 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
753 | &request->data_buffer, | |
754 | vstor_packet, | |
755 | sizeof(struct vstor_packet), | |
756 | (unsigned long)request); | |
757 | } else { | |
758 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
759 | sizeof(struct vstor_packet), | |
760 | (unsigned long)request, | |
761 | VM_PKT_DATA_INBAND, | |
762 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
763 | } | |
764 | ||
765 | if (ret != 0) | |
766 | return ret; | |
767 | ||
768 | atomic_inc(&stor_device->num_outstanding_req); | |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
bd1f5d6a S |
773 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
774 | { | |
775 | *target = | |
776 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
777 | ||
778 | *path = | |
779 | dev->dev_instance.b[3] << 24 | | |
780 | dev->dev_instance.b[2] << 16 | | |
781 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
782 | } | |
783 | ||
bef4a34a | 784 | |
5b60acee S |
785 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
786 | { | |
787 | /* | |
788 | * This enables luns to be located sparsely. Otherwise, we may not | |
789 | * discovered them. | |
790 | */ | |
791 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
792 | return 0; | |
793 | } | |
794 | ||
a1ebfeae S |
795 | static int storvsc_merge_bvec(struct request_queue *q, |
796 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
797 | { | |
798 | /* checking done by caller. */ | |
799 | return bvec->bv_len; | |
800 | } | |
801 | ||
419f2d03 S |
802 | static int storvsc_device_configure(struct scsi_device *sdevice) |
803 | { | |
804 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
805 | STORVSC_MAX_IO_REQUESTS); | |
806 | ||
419f2d03 S |
807 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
808 | ||
419f2d03 S |
809 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
810 | ||
811 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
812 | |
813 | return 0; | |
814 | } | |
815 | ||
49a3c7a9 S |
816 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
817 | unsigned int sg_count) | |
818 | { | |
819 | int i; | |
820 | struct page *page_buf; | |
821 | ||
822 | for (i = 0; i < sg_count; i++) { | |
823 | page_buf = sg_page((&sgl[i])); | |
824 | if (page_buf != NULL) | |
825 | __free_page(page_buf); | |
826 | } | |
827 | ||
828 | kfree(sgl); | |
829 | } | |
830 | ||
3862ef3e S |
831 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
832 | { | |
833 | int i; | |
834 | ||
835 | /* No need to check */ | |
836 | if (sg_count < 2) | |
837 | return -1; | |
838 | ||
839 | /* We have at least 2 sg entries */ | |
840 | for (i = 0; i < sg_count; i++) { | |
841 | if (i == 0) { | |
842 | /* make sure 1st one does not have hole */ | |
843 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
844 | return i; | |
845 | } else if (i == sg_count - 1) { | |
846 | /* make sure last one does not have hole */ | |
847 | if (sgl[i].offset != 0) | |
848 | return i; | |
849 | } else { | |
850 | /* make sure no hole in the middle */ | |
851 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
852 | return i; | |
853 | } | |
854 | } | |
855 | return -1; | |
856 | } | |
857 | ||
a9753cbd S |
858 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
859 | unsigned int sg_count, | |
860 | unsigned int len) | |
861 | { | |
862 | int i; | |
863 | int num_pages; | |
864 | struct scatterlist *bounce_sgl; | |
865 | struct page *page_buf; | |
866 | ||
867 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
868 | ||
869 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
870 | if (!bounce_sgl) | |
871 | return NULL; | |
872 | ||
873 | for (i = 0; i < num_pages; i++) { | |
874 | page_buf = alloc_page(GFP_ATOMIC); | |
875 | if (!page_buf) | |
876 | goto cleanup; | |
877 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
878 | } | |
879 | ||
880 | return bounce_sgl; | |
881 | ||
882 | cleanup: | |
883 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
884 | return NULL; | |
885 | } | |
886 | ||
29fe2c9b S |
887 | |
888 | /* Assume the original sgl has enough room */ | |
889 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
890 | struct scatterlist *bounce_sgl, | |
891 | unsigned int orig_sgl_count) | |
892 | { | |
893 | int i; | |
894 | int j = 0; | |
895 | unsigned long src, dest; | |
896 | unsigned int srclen, destlen, copylen; | |
897 | unsigned int total_copied = 0; | |
898 | unsigned long bounce_addr = 0; | |
899 | unsigned long dest_addr = 0; | |
900 | unsigned long flags; | |
901 | ||
902 | local_irq_save(flags); | |
903 | ||
904 | for (i = 0; i < orig_sgl_count; i++) { | |
905 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
906 | KM_IRQ0) + orig_sgl[i].offset; | |
907 | dest = dest_addr; | |
908 | destlen = orig_sgl[i].length; | |
909 | ||
910 | if (bounce_addr == 0) | |
911 | bounce_addr = | |
912 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
913 | KM_IRQ0); | |
914 | ||
915 | while (destlen) { | |
916 | src = bounce_addr + bounce_sgl[j].offset; | |
917 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
918 | ||
919 | copylen = min(srclen, destlen); | |
920 | memcpy((void *)dest, (void *)src, copylen); | |
921 | ||
922 | total_copied += copylen; | |
923 | bounce_sgl[j].offset += copylen; | |
924 | destlen -= copylen; | |
925 | dest += copylen; | |
926 | ||
927 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
928 | /* full */ | |
929 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
930 | j++; | |
931 | ||
932 | /* if we need to use another bounce buffer */ | |
933 | if (destlen || i != orig_sgl_count - 1) | |
934 | bounce_addr = | |
935 | (unsigned long)kmap_atomic( | |
936 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
937 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
938 | /* unmap the last bounce that is < PAGE_SIZE */ | |
939 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
940 | } | |
941 | } | |
942 | ||
943 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
944 | KM_IRQ0); | |
945 | } | |
946 | ||
947 | local_irq_restore(flags); | |
948 | ||
949 | return total_copied; | |
950 | } | |
951 | ||
6a8ff44b S |
952 | |
953 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
954 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
955 | struct scatterlist *bounce_sgl, | |
956 | unsigned int orig_sgl_count) | |
957 | { | |
958 | int i; | |
959 | int j = 0; | |
960 | unsigned long src, dest; | |
961 | unsigned int srclen, destlen, copylen; | |
962 | unsigned int total_copied = 0; | |
963 | unsigned long bounce_addr = 0; | |
964 | unsigned long src_addr = 0; | |
965 | unsigned long flags; | |
966 | ||
967 | local_irq_save(flags); | |
968 | ||
969 | for (i = 0; i < orig_sgl_count; i++) { | |
970 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
971 | KM_IRQ0) + orig_sgl[i].offset; | |
972 | src = src_addr; | |
973 | srclen = orig_sgl[i].length; | |
974 | ||
975 | if (bounce_addr == 0) | |
976 | bounce_addr = | |
977 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
978 | KM_IRQ0); | |
979 | ||
980 | while (srclen) { | |
981 | /* assume bounce offset always == 0 */ | |
982 | dest = bounce_addr + bounce_sgl[j].length; | |
983 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
984 | ||
985 | copylen = min(srclen, destlen); | |
986 | memcpy((void *)dest, (void *)src, copylen); | |
987 | ||
988 | total_copied += copylen; | |
989 | bounce_sgl[j].length += copylen; | |
990 | srclen -= copylen; | |
991 | src += copylen; | |
992 | ||
993 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
994 | /* full..move to next entry */ | |
995 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
996 | j++; | |
997 | ||
998 | /* if we need to use another bounce buffer */ | |
999 | if (srclen || i != orig_sgl_count - 1) | |
1000 | bounce_addr = | |
1001 | (unsigned long)kmap_atomic( | |
1002 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
1003 | ||
1004 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
1005 | /* unmap the last bounce that is < PAGE_SIZE */ | |
1006 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
1011 | } | |
1012 | ||
1013 | local_irq_restore(flags); | |
1014 | ||
1015 | return total_copied; | |
1016 | } | |
1017 | ||
5c5c0234 | 1018 | |
5c5c0234 S |
1019 | static int storvsc_remove(struct hv_device *dev) |
1020 | { | |
5c5c0234 S |
1021 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
1022 | struct hv_host_device *host_dev = | |
1023 | (struct hv_host_device *)host->hostdata; | |
1024 | ||
2935a407 S |
1025 | scsi_remove_host(host); |
1026 | ||
2935a407 | 1027 | scsi_host_put(host); |
d36b0a03 | 1028 | |
6cdc57c0 | 1029 | storvsc_dev_remove(dev); |
5c5c0234 S |
1030 | if (host_dev->request_pool) { |
1031 | kmem_cache_destroy(host_dev->request_pool); | |
1032 | host_dev->request_pool = NULL; | |
1033 | } | |
5c5c0234 S |
1034 | return 0; |
1035 | } | |
1036 | ||
62838ce2 S |
1037 | |
1038 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
1039 | sector_t capacity, int *info) | |
1040 | { | |
5326fd5c S |
1041 | sector_t nsect = capacity; |
1042 | sector_t cylinders = nsect; | |
1043 | int heads, sectors_pt; | |
62838ce2 | 1044 | |
5326fd5c S |
1045 | /* |
1046 | * We are making up these values; let us keep it simple. | |
1047 | */ | |
1048 | heads = 0xff; | |
1049 | sectors_pt = 0x3f; /* Sectors per track */ | |
1050 | sector_div(cylinders, heads * sectors_pt); | |
1051 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1052 | cylinders = 0xffff; | |
62838ce2 S |
1053 | |
1054 | info[0] = heads; | |
5326fd5c S |
1055 | info[1] = sectors_pt; |
1056 | info[2] = (int)cylinders; | |
62838ce2 | 1057 | |
62838ce2 S |
1058 | return 0; |
1059 | } | |
aa3d789e S |
1060 | |
1061 | static int storvsc_host_reset(struct hv_device *device) | |
1062 | { | |
1063 | struct storvsc_device *stor_device; | |
1064 | struct hv_storvsc_request *request; | |
1065 | struct vstor_packet *vstor_packet; | |
1066 | int ret, t; | |
1067 | ||
aa3d789e | 1068 | |
1eaaddf9 | 1069 | stor_device = get_out_stor_device(device); |
aa3d789e | 1070 | if (!stor_device) |
f3b74165 | 1071 | return -ENODEV; |
aa3d789e S |
1072 | |
1073 | request = &stor_device->reset_request; | |
1074 | vstor_packet = &request->vstor_packet; | |
1075 | ||
1076 | init_completion(&request->wait_event); | |
1077 | ||
1078 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1079 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1080 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1081 | ||
1082 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1083 | sizeof(struct vstor_packet), | |
1084 | (unsigned long)&stor_device->reset_request, | |
1085 | VM_PKT_DATA_INBAND, | |
1086 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1087 | if (ret != 0) | |
1088 | goto cleanup; | |
1089 | ||
46d2eb6d | 1090 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
1091 | if (t == 0) { |
1092 | ret = -ETIMEDOUT; | |
1093 | goto cleanup; | |
1094 | } | |
1095 | ||
aa3d789e S |
1096 | |
1097 | /* | |
1098 | * At this point, all outstanding requests in the adapter | |
1099 | * should have been flushed out and return to us | |
1100 | */ | |
1101 | ||
1102 | cleanup: | |
aa3d789e S |
1103 | return ret; |
1104 | } | |
1105 | ||
1106 | ||
96e690be S |
1107 | /* |
1108 | * storvsc_host_reset_handler - Reset the scsi HBA | |
1109 | */ | |
1110 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
1111 | { | |
1112 | int ret; | |
1113 | struct hv_host_device *host_dev = | |
1114 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1115 | struct hv_device *dev = host_dev->dev; | |
1116 | ||
96e690be S |
1117 | ret = storvsc_host_reset(dev); |
1118 | if (ret != 0) | |
1119 | return ret; | |
1120 | ||
96e690be S |
1121 | return ret; |
1122 | } | |
1123 | ||
8a411bad S |
1124 | |
1125 | /* | |
1126 | * storvsc_commmand_completion - Command completion processing | |
1127 | */ | |
1128 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
1129 | { | |
1130 | struct storvsc_cmd_request *cmd_request = | |
1131 | (struct storvsc_cmd_request *)request->context; | |
1132 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
1133 | struct hv_host_device *host_dev = | |
1134 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1135 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
1136 | struct scsi_sense_hdr sense_hdr; | |
1137 | struct vmscsi_request *vm_srb; | |
1138 | ||
3612ef99 | 1139 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1140 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
1141 | if (vm_srb->data_in == READ_TYPE) { |
1142 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
1143 | cmd_request->bounce_sgl, |
1144 | scsi_sg_count(scmnd)); | |
3612ef99 S |
1145 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
1146 | cmd_request->bounce_sgl_count); | |
1147 | } | |
8a411bad S |
1148 | } |
1149 | ||
8a411bad S |
1150 | scmnd->result = vm_srb->scsi_status; |
1151 | ||
1152 | if (scmnd->result) { | |
1153 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1154 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1155 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1156 | } | |
1157 | ||
8a411bad S |
1158 | scsi_set_resid(scmnd, |
1159 | request->data_buffer.len - | |
1160 | vm_srb->data_transfer_length); | |
1161 | ||
1162 | scsi_done_fn = scmnd->scsi_done; | |
1163 | ||
1164 | scmnd->host_scribble = NULL; | |
1165 | scmnd->scsi_done = NULL; | |
1166 | ||
8a411bad S |
1167 | scsi_done_fn(scmnd); |
1168 | ||
1169 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1170 | } | |
1171 | ||
c5b463ae S |
1172 | |
1173 | /* | |
1174 | * storvsc_queuecommand - Initiate command processing | |
1175 | */ | |
1176 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
1177 | void (*done)(struct scsi_cmnd *)) | |
1178 | { | |
1179 | int ret; | |
1180 | struct hv_host_device *host_dev = | |
1181 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1182 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
1183 | struct hv_storvsc_request *request; |
1184 | struct storvsc_cmd_request *cmd_request; | |
1185 | unsigned int request_size = 0; | |
1186 | int i; | |
1187 | struct scatterlist *sgl; | |
1188 | unsigned int sg_count = 0; | |
1189 | struct vmscsi_request *vm_srb; | |
1190 | ||
1191 | ||
1192 | /* If retrying, no need to prep the cmd */ | |
1193 | if (scmnd->host_scribble) { | |
c5b463ae S |
1194 | |
1195 | cmd_request = | |
1196 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
1197 | |
1198 | goto retry_request; | |
1199 | } | |
1200 | ||
c5b463ae S |
1201 | scmnd->scsi_done = done; |
1202 | ||
1203 | request_size = sizeof(struct storvsc_cmd_request); | |
1204 | ||
1205 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
1206 | GFP_ATOMIC); | |
1207 | if (!cmd_request) { | |
1208 | scmnd->scsi_done = NULL; | |
1209 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
1210 | } | |
1211 | ||
1212 | /* Setup the cmd request */ | |
1213 | cmd_request->bounce_sgl_count = 0; | |
1214 | cmd_request->bounce_sgl = NULL; | |
1215 | cmd_request->cmd = scmnd; | |
1216 | ||
1217 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1218 | ||
1219 | request = &cmd_request->request; | |
1220 | vm_srb = &request->vstor_packet.vm_srb; | |
1221 | ||
1222 | ||
1223 | /* Build the SRB */ | |
1224 | switch (scmnd->sc_data_direction) { | |
1225 | case DMA_TO_DEVICE: | |
1226 | vm_srb->data_in = WRITE_TYPE; | |
1227 | break; | |
1228 | case DMA_FROM_DEVICE: | |
1229 | vm_srb->data_in = READ_TYPE; | |
1230 | break; | |
1231 | default: | |
1232 | vm_srb->data_in = UNKNOWN_TYPE; | |
1233 | break; | |
1234 | } | |
1235 | ||
1236 | request->on_io_completion = storvsc_commmand_completion; | |
1237 | request->context = cmd_request;/* scmnd; */ | |
1238 | ||
c5b463ae S |
1239 | vm_srb->port_number = host_dev->port; |
1240 | vm_srb->path_id = scmnd->device->channel; | |
1241 | vm_srb->target_id = scmnd->device->id; | |
1242 | vm_srb->lun = scmnd->device->lun; | |
1243 | ||
c5b463ae S |
1244 | vm_srb->cdb_length = scmnd->cmd_len; |
1245 | ||
1246 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1247 | ||
1248 | request->sense_buffer = scmnd->sense_buffer; | |
1249 | ||
1250 | ||
1251 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1252 | if (scsi_sg_count(scmnd)) { | |
1253 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1254 | sg_count = scsi_sg_count(scmnd); | |
1255 | ||
1256 | /* check if we need to bounce the sgl */ | |
1257 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1258 | cmd_request->bounce_sgl = | |
1259 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
1260 | scsi_bufflen(scmnd)); | |
1261 | if (!cmd_request->bounce_sgl) { | |
1262 | scmnd->scsi_done = NULL; | |
1263 | scmnd->host_scribble = NULL; | |
1264 | kmem_cache_free(host_dev->request_pool, | |
1265 | cmd_request); | |
1266 | ||
1267 | return SCSI_MLQUEUE_HOST_BUSY; | |
1268 | } | |
1269 | ||
1270 | cmd_request->bounce_sgl_count = | |
1271 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1272 | PAGE_SHIFT; | |
1273 | ||
fa23b8c7 S |
1274 | if (vm_srb->data_in == WRITE_TYPE) |
1275 | copy_to_bounce_buffer(sgl, | |
1276 | cmd_request->bounce_sgl, | |
1277 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1278 | |
1279 | sgl = cmd_request->bounce_sgl; | |
1280 | sg_count = cmd_request->bounce_sgl_count; | |
1281 | } | |
1282 | ||
1283 | request->data_buffer.offset = sgl[0].offset; | |
1284 | ||
1285 | for (i = 0; i < sg_count; i++) | |
1286 | request->data_buffer.pfn_array[i] = | |
1287 | page_to_pfn(sg_page((&sgl[i]))); | |
1288 | ||
1289 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1290 | request->data_buffer.offset = |
1291 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1292 | request->data_buffer.pfn_array[0] = | |
1293 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1294 | } | |
1295 | ||
1296 | retry_request: | |
1297 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1298 | ret = storvsc_do_io(dev, &cmd_request->request); |
1299 | ||
d2598f01 | 1300 | if (ret == -EAGAIN) { |
c5b463ae S |
1301 | /* no more space */ |
1302 | ||
1303 | if (cmd_request->bounce_sgl_count) { | |
1304 | /* | |
1305 | * FIXME: We can optimize on writes by just skipping | |
1306 | * this | |
1307 | */ | |
1308 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1309 | cmd_request->bounce_sgl, | |
1310 | scsi_sg_count(scmnd)); | |
1311 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1312 | cmd_request->bounce_sgl_count); | |
1313 | } | |
1314 | ||
1315 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1316 | ||
1317 | scmnd->scsi_done = NULL; | |
1318 | scmnd->host_scribble = NULL; | |
1319 | ||
1320 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1321 | } | |
1322 | ||
1323 | return ret; | |
1324 | } | |
1325 | ||
1326 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
1327 | ||
bef4a34a | 1328 | |
454f18a9 | 1329 | /* Scsi driver */ |
bef4a34a | 1330 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1331 | .module = THIS_MODULE, |
1332 | .name = "storvsc_host_t", | |
1333 | .bios_param = storvsc_get_chs, | |
1334 | .queuecommand = storvsc_queuecommand, | |
1335 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1336 | .slave_alloc = storvsc_device_alloc, | |
1337 | .slave_configure = storvsc_device_configure, | |
1338 | .cmd_per_lun = 1, | |
1339 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1340 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1341 | .this_id = -1, |
454f18a9 | 1342 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1343 | /* currently 32 */ |
1344 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1345 | /* | |
1346 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1347 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1348 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1349 | * multiple | |
1350 | */ | |
454f18a9 | 1351 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1352 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1353 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1354 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1355 | }; |
1356 | ||
21e37742 S |
1357 | /* |
1358 | * The storvsc_probe function assumes that the IDE guid | |
1359 | * is the second entry. | |
1360 | */ | |
d847b5fe | 1361 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1362 | /* SCSI guid */ |
1363 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
1364 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) }, | |
21e37742 S |
1365 | /* IDE guid */ |
1366 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
1367 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) }, | |
c45cf2d4 | 1368 | { }, |
d847b5fe | 1369 | }; |
bef4a34a | 1370 | |
d847b5fe | 1371 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1372 | |
bd1f5d6a | 1373 | |
3e189519 | 1374 | /* |
ff568d3a GKH |
1375 | * storvsc_probe - Add a new device for this driver |
1376 | */ | |
f5c78872 | 1377 | |
9efd21e1 | 1378 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 1379 | { |
ff568d3a | 1380 | int ret; |
bef4a34a | 1381 | struct Scsi_Host *host; |
795b613d | 1382 | struct hv_host_device *host_dev; |
9f0c7d2c | 1383 | struct storvsc_device_info device_info; |
bd1f5d6a S |
1384 | bool dev_is_ide; |
1385 | int path = 0; | |
1386 | int target = 0; | |
1387 | ||
21e37742 | 1388 | if (!memcmp(&device->dev_type.b, id_table[1].guid, sizeof(uuid_le))) |
bd1f5d6a S |
1389 | dev_is_ide = true; |
1390 | else | |
1391 | dev_is_ide = false; | |
bef4a34a | 1392 | |
ff568d3a | 1393 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1394 | sizeof(struct hv_host_device)); |
f8feed06 | 1395 | if (!host) |
bef4a34a | 1396 | return -ENOMEM; |
bef4a34a | 1397 | |
9efd21e1 | 1398 | dev_set_drvdata(&device->device, host); |
bef4a34a | 1399 | |
795b613d S |
1400 | host_dev = (struct hv_host_device *)host->hostdata; |
1401 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 1402 | |
795b613d | 1403 | host_dev->port = host->host_no; |
97c15296 | 1404 | host_dev->dev = device; |
bef4a34a | 1405 | |
795b613d | 1406 | host_dev->request_pool = |
9efd21e1 | 1407 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1408 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1409 | SLAB_HWCACHE_ALIGN, NULL); |
1410 | ||
795b613d | 1411 | if (!host_dev->request_pool) { |
bef4a34a | 1412 | scsi_host_put(host); |
bef4a34a HJ |
1413 | return -ENOMEM; |
1414 | } | |
1415 | ||
8a046024 | 1416 | device_info.port_number = host->host_no; |
fa4d123a | 1417 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 1418 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 1419 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 1420 | |
ff568d3a | 1421 | if (ret != 0) { |
795b613d | 1422 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 1423 | scsi_host_put(host); |
8e854680 | 1424 | return -ENODEV; |
bef4a34a HJ |
1425 | } |
1426 | ||
bd1f5d6a S |
1427 | if (dev_is_ide) |
1428 | storvsc_get_ide_info(device, &target, &path); | |
1429 | ||
795b613d S |
1430 | host_dev->path = device_info.path_id; |
1431 | host_dev->target = device_info.target_id; | |
bef4a34a | 1432 | |
ff568d3a GKH |
1433 | /* max # of devices per target */ |
1434 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1435 | /* max # of targets per channel */ | |
1436 | host->max_id = STORVSC_MAX_TARGETS; | |
1437 | /* max # of channels */ | |
1438 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 1439 | |
454f18a9 | 1440 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1441 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a S |
1442 | if (ret != 0) |
1443 | goto err_out; | |
bef4a34a | 1444 | |
bd1f5d6a S |
1445 | if (!dev_is_ide) { |
1446 | scsi_scan_host(host); | |
1447 | return 0; | |
1448 | } | |
1449 | ret = scsi_add_device(host, 0, target, 0); | |
1450 | if (ret) { | |
1451 | scsi_remove_host(host); | |
1452 | goto err_out; | |
bef4a34a | 1453 | } |
bd1f5d6a | 1454 | return 0; |
bef4a34a | 1455 | |
bd1f5d6a S |
1456 | err_out: |
1457 | storvsc_dev_remove(device); | |
1458 | kmem_cache_destroy(host_dev->request_pool); | |
1459 | scsi_host_put(host); | |
1460 | return -ENODEV; | |
bef4a34a HJ |
1461 | } |
1462 | ||
7bd05b91 S |
1463 | /* The one and only one */ |
1464 | ||
40bf63ed | 1465 | static struct hv_driver storvsc_drv = { |
768fa219 | 1466 | .name = "storvsc", |
d847b5fe | 1467 | .id_table = id_table, |
40bf63ed S |
1468 | .probe = storvsc_probe, |
1469 | .remove = storvsc_remove, | |
39ae6fae | 1470 | }; |
7bd05b91 | 1471 | |
d9bbae83 | 1472 | static int __init storvsc_drv_init(void) |
f5c78872 | 1473 | { |
01415ab3 S |
1474 | u32 max_outstanding_req_per_channel; |
1475 | ||
1476 | /* | |
1477 | * Divide the ring buffer data size (which is 1 page less | |
1478 | * than the ring buffer size since that page is reserved for | |
1479 | * the ring buffer indices) by the max request size (which is | |
1480 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1481 | */ | |
01415ab3 | 1482 | max_outstanding_req_per_channel = |
768fa219 GKH |
1483 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1484 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1485 | sizeof(struct vstor_packet) + sizeof(u64), | |
1486 | sizeof(u64))); | |
f5c78872 | 1487 | |
01415ab3 | 1488 | if (max_outstanding_req_per_channel < |
f5c78872 | 1489 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1490 | return -EINVAL; |
f5c78872 | 1491 | |
768fa219 | 1492 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1493 | } |
1494 | ||
c63ba9e1 | 1495 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1496 | { |
768fa219 | 1497 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1498 | } |
1499 | ||
ff568d3a | 1500 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1501 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1502 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1503 | module_init(storvsc_drv_init); |
c63ba9e1 | 1504 | module_exit(storvsc_drv_exit); |