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 | |
cf55f4a8 | 235 | #define STORVSC_MAX_CMD_LEN 16 |
f0d79fe9 S |
236 | |
237 | struct hv_storvsc_request; | |
238 | ||
239 | /* Matches Windows-end */ | |
240 | enum storvsc_request_type { | |
241 | WRITE_TYPE, | |
242 | READ_TYPE, | |
243 | UNKNOWN_TYPE, | |
244 | }; | |
245 | ||
246 | ||
247 | struct hv_storvsc_request { | |
f0d79fe9 S |
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 | ||
f0d79fe9 S |
262 | /* A storvsc device is a device object that contains a vmbus channel */ |
263 | struct storvsc_device { | |
264 | struct hv_device *device; | |
265 | ||
266 | bool destroy; | |
267 | bool drain_notify; | |
268 | atomic_t num_outstanding_req; | |
269 | ||
270 | wait_queue_head_t waiting_to_drain; | |
271 | ||
272 | /* | |
273 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
274 | * controller. In reality, the pathid, targetid is always 0 | |
275 | * and the port is set by us | |
276 | */ | |
277 | unsigned int port_number; | |
278 | unsigned char path_id; | |
279 | unsigned char target_id; | |
280 | ||
281 | /* Used for vsc/vsp channel reset process */ | |
282 | struct hv_storvsc_request init_request; | |
283 | struct hv_storvsc_request reset_request; | |
284 | }; | |
285 | ||
c1b3d067 S |
286 | struct hv_host_device { |
287 | struct hv_device *dev; | |
288 | struct kmem_cache *request_pool; | |
289 | unsigned int port; | |
290 | unsigned char path; | |
291 | unsigned char target; | |
292 | }; | |
293 | ||
294 | struct storvsc_cmd_request { | |
295 | struct list_head entry; | |
296 | struct scsi_cmnd *cmd; | |
297 | ||
298 | unsigned int bounce_sgl_count; | |
299 | struct scatterlist *bounce_sgl; | |
300 | ||
301 | struct hv_storvsc_request request; | |
302 | }; | |
f0d79fe9 S |
303 | |
304 | static inline struct storvsc_device *get_out_stor_device( | |
305 | struct hv_device *device) | |
306 | { | |
307 | struct storvsc_device *stor_device; | |
308 | ||
309 | stor_device = (struct storvsc_device *)device->ext; | |
310 | ||
311 | if (stor_device && stor_device->destroy) | |
312 | stor_device = NULL; | |
313 | ||
314 | return stor_device; | |
315 | } | |
316 | ||
317 | ||
318 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
319 | { | |
320 | dev->drain_notify = true; | |
321 | wait_event(dev->waiting_to_drain, | |
322 | atomic_read(&dev->num_outstanding_req) == 0); | |
323 | dev->drain_notify = false; | |
324 | } | |
bef4a34a | 325 | |
8dcf37d4 S |
326 | static inline struct storvsc_device *get_in_stor_device( |
327 | struct hv_device *device) | |
328 | { | |
329 | struct storvsc_device *stor_device; | |
8dcf37d4 | 330 | |
8dcf37d4 S |
331 | stor_device = (struct storvsc_device *)device->ext; |
332 | ||
333 | if (!stor_device) | |
334 | goto get_in_err; | |
335 | ||
336 | /* | |
337 | * If the device is being destroyed; allow incoming | |
338 | * traffic only to cleanup outstanding requests. | |
339 | */ | |
340 | ||
341 | if (stor_device->destroy && | |
342 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
343 | stor_device = NULL; | |
344 | ||
345 | get_in_err: | |
8dcf37d4 S |
346 | return stor_device; |
347 | ||
348 | } | |
349 | ||
350 | static int storvsc_channel_init(struct hv_device *device) | |
351 | { | |
352 | struct storvsc_device *stor_device; | |
353 | struct hv_storvsc_request *request; | |
354 | struct vstor_packet *vstor_packet; | |
355 | int ret, t; | |
356 | ||
357 | stor_device = get_out_stor_device(device); | |
358 | if (!stor_device) | |
359 | return -ENODEV; | |
360 | ||
361 | request = &stor_device->init_request; | |
362 | vstor_packet = &request->vstor_packet; | |
363 | ||
364 | /* | |
365 | * Now, initiate the vsc/vsp initialization protocol on the open | |
366 | * channel | |
367 | */ | |
368 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
369 | init_completion(&request->wait_event); | |
370 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
371 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
372 | ||
373 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
374 | sizeof(struct vstor_packet), | |
375 | (unsigned long)request, | |
376 | VM_PKT_DATA_INBAND, | |
377 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
378 | if (ret != 0) | |
379 | goto cleanup; | |
380 | ||
381 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
382 | if (t == 0) { | |
383 | ret = -ETIMEDOUT; | |
384 | goto cleanup; | |
385 | } | |
386 | ||
387 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
388 | vstor_packet->status != 0) | |
389 | goto cleanup; | |
390 | ||
391 | ||
392 | /* reuse the packet for version range supported */ | |
393 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
394 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
395 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
396 | ||
397 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
398 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
399 | ||
400 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
401 | sizeof(struct vstor_packet), | |
402 | (unsigned long)request, | |
403 | VM_PKT_DATA_INBAND, | |
404 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
405 | if (ret != 0) | |
406 | goto cleanup; | |
407 | ||
408 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
409 | if (t == 0) { | |
410 | ret = -ETIMEDOUT; | |
411 | goto cleanup; | |
412 | } | |
413 | ||
414 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
415 | vstor_packet->status != 0) | |
416 | goto cleanup; | |
417 | ||
418 | ||
419 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
420 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
421 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
422 | vstor_packet->storage_channel_properties.port_number = | |
423 | stor_device->port_number; | |
424 | ||
425 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
426 | sizeof(struct vstor_packet), | |
427 | (unsigned long)request, | |
428 | VM_PKT_DATA_INBAND, | |
429 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
430 | ||
431 | if (ret != 0) | |
432 | goto cleanup; | |
433 | ||
434 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
435 | if (t == 0) { | |
436 | ret = -ETIMEDOUT; | |
437 | goto cleanup; | |
438 | } | |
439 | ||
440 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
441 | vstor_packet->status != 0) | |
442 | goto cleanup; | |
443 | ||
444 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
445 | stor_device->target_id | |
446 | = vstor_packet->storage_channel_properties.target_id; | |
447 | ||
448 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
449 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
450 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
451 | ||
452 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
453 | sizeof(struct vstor_packet), | |
454 | (unsigned long)request, | |
455 | VM_PKT_DATA_INBAND, | |
456 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
457 | ||
458 | if (ret != 0) | |
459 | goto cleanup; | |
460 | ||
461 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
462 | if (t == 0) { | |
463 | ret = -ETIMEDOUT; | |
464 | goto cleanup; | |
465 | } | |
466 | ||
467 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
468 | vstor_packet->status != 0) | |
469 | goto cleanup; | |
470 | ||
471 | ||
472 | cleanup: | |
473 | return ret; | |
474 | } | |
475 | ||
476 | static void storvsc_on_io_completion(struct hv_device *device, | |
477 | struct vstor_packet *vstor_packet, | |
478 | struct hv_storvsc_request *request) | |
479 | { | |
480 | struct storvsc_device *stor_device; | |
481 | struct vstor_packet *stor_pkt; | |
482 | ||
483 | stor_device = (struct storvsc_device *)device->ext; | |
484 | ||
485 | stor_pkt = &request->vstor_packet; | |
486 | ||
4ed51a21 S |
487 | /* |
488 | * The current SCSI handling on the host side does | |
489 | * not correctly handle: | |
490 | * INQUIRY command with page code parameter set to 0x80 | |
491 | * MODE_SENSE command with cmd[2] == 0x1c | |
492 | * | |
493 | * Setup srb and scsi status so this won't be fatal. | |
494 | * We do this so we can distinguish truly fatal failues | |
495 | * (srb status == 0x4) and off-line the device in that case. | |
496 | */ | |
497 | ||
498 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
499 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { | |
500 | vstor_packet->vm_srb.scsi_status = 0; | |
501 | vstor_packet->vm_srb.srb_status = 0x1; | |
502 | } | |
503 | ||
8dcf37d4 S |
504 | |
505 | /* Copy over the status...etc */ | |
506 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
507 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
508 | stor_pkt->vm_srb.sense_info_length = | |
509 | vstor_packet->vm_srb.sense_info_length; | |
510 | ||
511 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
512 | vstor_packet->vm_srb.srb_status != 1){ | |
513 | DPRINT_WARN(STORVSC, | |
514 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
515 | stor_pkt->vm_srb.cdb[0], | |
516 | vstor_packet->vm_srb.scsi_status, | |
517 | vstor_packet->vm_srb.srb_status); | |
518 | } | |
519 | ||
520 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
521 | /* CHECK_CONDITION */ | |
522 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
523 | /* autosense data available */ | |
524 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
525 | "valid - len %d\n", request, | |
526 | vstor_packet->vm_srb.sense_info_length); | |
527 | ||
528 | memcpy(request->sense_buffer, | |
529 | vstor_packet->vm_srb.sense_data, | |
530 | vstor_packet->vm_srb.sense_info_length); | |
531 | ||
532 | } | |
533 | } | |
534 | ||
535 | stor_pkt->vm_srb.data_transfer_length = | |
536 | vstor_packet->vm_srb.data_transfer_length; | |
537 | ||
538 | request->on_io_completion(request); | |
539 | ||
540 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
541 | stor_device->drain_notify) | |
542 | wake_up(&stor_device->waiting_to_drain); | |
543 | ||
544 | ||
545 | } | |
546 | ||
547 | static void storvsc_on_receive(struct hv_device *device, | |
548 | struct vstor_packet *vstor_packet, | |
549 | struct hv_storvsc_request *request) | |
550 | { | |
551 | switch (vstor_packet->operation) { | |
552 | case VSTOR_OPERATION_COMPLETE_IO: | |
553 | storvsc_on_io_completion(device, vstor_packet, request); | |
554 | break; | |
555 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
556 | ||
557 | default: | |
558 | break; | |
559 | } | |
560 | } | |
561 | ||
562 | static void storvsc_on_channel_callback(void *context) | |
563 | { | |
564 | struct hv_device *device = (struct hv_device *)context; | |
565 | struct storvsc_device *stor_device; | |
566 | u32 bytes_recvd; | |
567 | u64 request_id; | |
568 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
569 | struct hv_storvsc_request *request; | |
570 | int ret; | |
571 | ||
572 | ||
573 | stor_device = get_in_stor_device(device); | |
574 | if (!stor_device) | |
575 | return; | |
576 | ||
577 | do { | |
578 | ret = vmbus_recvpacket(device->channel, packet, | |
579 | ALIGN(sizeof(struct vstor_packet), 8), | |
580 | &bytes_recvd, &request_id); | |
581 | if (ret == 0 && bytes_recvd > 0) { | |
582 | ||
583 | request = (struct hv_storvsc_request *) | |
584 | (unsigned long)request_id; | |
585 | ||
586 | if ((request == &stor_device->init_request) || | |
587 | (request == &stor_device->reset_request)) { | |
588 | ||
589 | memcpy(&request->vstor_packet, packet, | |
590 | sizeof(struct vstor_packet)); | |
591 | complete(&request->wait_event); | |
592 | } else { | |
593 | storvsc_on_receive(device, | |
594 | (struct vstor_packet *)packet, | |
595 | request); | |
596 | } | |
597 | } else { | |
598 | break; | |
599 | } | |
600 | } while (1); | |
601 | ||
602 | return; | |
603 | } | |
604 | ||
605 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
606 | { | |
607 | struct vmstorage_channel_properties props; | |
608 | int ret; | |
609 | ||
610 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
611 | ||
612 | /* Open the channel */ | |
613 | ret = vmbus_open(device->channel, | |
614 | ring_size, | |
615 | ring_size, | |
616 | (void *)&props, | |
617 | sizeof(struct vmstorage_channel_properties), | |
618 | storvsc_on_channel_callback, device); | |
619 | ||
620 | if (ret != 0) | |
621 | return ret; | |
622 | ||
623 | ret = storvsc_channel_init(device); | |
624 | ||
625 | return ret; | |
626 | } | |
627 | ||
c1b3d067 | 628 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
629 | { |
630 | struct storvsc_device *stor_device; | |
631 | unsigned long flags; | |
632 | ||
633 | stor_device = (struct storvsc_device *)device->ext; | |
634 | ||
635 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
636 | stor_device->destroy = true; | |
637 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
638 | ||
639 | /* | |
640 | * At this point, all outbound traffic should be disable. We | |
641 | * only allow inbound traffic (responses) to proceed so that | |
642 | * outstanding requests can be completed. | |
643 | */ | |
644 | ||
645 | storvsc_wait_to_drain(stor_device); | |
646 | ||
647 | /* | |
648 | * Since we have already drained, we don't need to busy wait | |
649 | * as was done in final_release_stor_device() | |
650 | * Note that we cannot set the ext pointer to NULL until | |
651 | * we have drained - to drain the outgoing packets, we need to | |
652 | * allow incoming packets. | |
653 | */ | |
654 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
655 | device->ext = NULL; | |
656 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
657 | ||
658 | /* Close the channel */ | |
659 | vmbus_close(device->channel); | |
660 | ||
661 | kfree(stor_device); | |
662 | return 0; | |
663 | } | |
664 | ||
c1b3d067 | 665 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
666 | struct hv_storvsc_request *request) |
667 | { | |
668 | struct storvsc_device *stor_device; | |
669 | struct vstor_packet *vstor_packet; | |
670 | int ret = 0; | |
671 | ||
672 | vstor_packet = &request->vstor_packet; | |
673 | stor_device = get_out_stor_device(device); | |
674 | ||
675 | if (!stor_device) | |
676 | return -ENODEV; | |
677 | ||
678 | ||
679 | request->device = device; | |
680 | ||
681 | ||
682 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
683 | ||
684 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
685 | ||
686 | ||
687 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
688 | ||
689 | ||
690 | vstor_packet->vm_srb.data_transfer_length = | |
691 | request->data_buffer.len; | |
692 | ||
693 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
694 | ||
695 | if (request->data_buffer.len) { | |
696 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
697 | &request->data_buffer, | |
698 | vstor_packet, | |
699 | sizeof(struct vstor_packet), | |
700 | (unsigned long)request); | |
701 | } else { | |
702 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
703 | sizeof(struct vstor_packet), | |
704 | (unsigned long)request, | |
705 | VM_PKT_DATA_INBAND, | |
706 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
707 | } | |
708 | ||
709 | if (ret != 0) | |
710 | return ret; | |
711 | ||
712 | atomic_inc(&stor_device->num_outstanding_req); | |
713 | ||
714 | return ret; | |
715 | } | |
716 | ||
bd1f5d6a S |
717 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
718 | { | |
719 | *target = | |
720 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
721 | ||
722 | *path = | |
723 | dev->dev_instance.b[3] << 24 | | |
724 | dev->dev_instance.b[2] << 16 | | |
725 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
726 | } | |
727 | ||
bef4a34a | 728 | |
5b60acee S |
729 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
730 | { | |
731 | /* | |
732 | * This enables luns to be located sparsely. Otherwise, we may not | |
733 | * discovered them. | |
734 | */ | |
735 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
736 | return 0; | |
737 | } | |
738 | ||
a1ebfeae S |
739 | static int storvsc_merge_bvec(struct request_queue *q, |
740 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
741 | { | |
742 | /* checking done by caller. */ | |
743 | return bvec->bv_len; | |
744 | } | |
745 | ||
419f2d03 S |
746 | static int storvsc_device_configure(struct scsi_device *sdevice) |
747 | { | |
748 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
749 | STORVSC_MAX_IO_REQUESTS); | |
750 | ||
419f2d03 S |
751 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
752 | ||
419f2d03 S |
753 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
754 | ||
755 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
49a3c7a9 S |
760 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
761 | unsigned int sg_count) | |
762 | { | |
763 | int i; | |
764 | struct page *page_buf; | |
765 | ||
766 | for (i = 0; i < sg_count; i++) { | |
767 | page_buf = sg_page((&sgl[i])); | |
768 | if (page_buf != NULL) | |
769 | __free_page(page_buf); | |
770 | } | |
771 | ||
772 | kfree(sgl); | |
773 | } | |
774 | ||
3862ef3e S |
775 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
776 | { | |
777 | int i; | |
778 | ||
779 | /* No need to check */ | |
780 | if (sg_count < 2) | |
781 | return -1; | |
782 | ||
783 | /* We have at least 2 sg entries */ | |
784 | for (i = 0; i < sg_count; i++) { | |
785 | if (i == 0) { | |
786 | /* make sure 1st one does not have hole */ | |
787 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
788 | return i; | |
789 | } else if (i == sg_count - 1) { | |
790 | /* make sure last one does not have hole */ | |
791 | if (sgl[i].offset != 0) | |
792 | return i; | |
793 | } else { | |
794 | /* make sure no hole in the middle */ | |
795 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
796 | return i; | |
797 | } | |
798 | } | |
799 | return -1; | |
800 | } | |
801 | ||
a9753cbd S |
802 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
803 | unsigned int sg_count, | |
804 | unsigned int len) | |
805 | { | |
806 | int i; | |
807 | int num_pages; | |
808 | struct scatterlist *bounce_sgl; | |
809 | struct page *page_buf; | |
810 | ||
811 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
812 | ||
813 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
814 | if (!bounce_sgl) | |
815 | return NULL; | |
816 | ||
817 | for (i = 0; i < num_pages; i++) { | |
818 | page_buf = alloc_page(GFP_ATOMIC); | |
819 | if (!page_buf) | |
820 | goto cleanup; | |
821 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
822 | } | |
823 | ||
824 | return bounce_sgl; | |
825 | ||
826 | cleanup: | |
827 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
828 | return NULL; | |
829 | } | |
830 | ||
29fe2c9b S |
831 | |
832 | /* Assume the original sgl has enough room */ | |
833 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
834 | struct scatterlist *bounce_sgl, | |
835 | unsigned int orig_sgl_count) | |
836 | { | |
837 | int i; | |
838 | int j = 0; | |
839 | unsigned long src, dest; | |
840 | unsigned int srclen, destlen, copylen; | |
841 | unsigned int total_copied = 0; | |
842 | unsigned long bounce_addr = 0; | |
843 | unsigned long dest_addr = 0; | |
844 | unsigned long flags; | |
845 | ||
846 | local_irq_save(flags); | |
847 | ||
848 | for (i = 0; i < orig_sgl_count; i++) { | |
849 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
850 | KM_IRQ0) + orig_sgl[i].offset; | |
851 | dest = dest_addr; | |
852 | destlen = orig_sgl[i].length; | |
853 | ||
854 | if (bounce_addr == 0) | |
855 | bounce_addr = | |
856 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
857 | KM_IRQ0); | |
858 | ||
859 | while (destlen) { | |
860 | src = bounce_addr + bounce_sgl[j].offset; | |
861 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
862 | ||
863 | copylen = min(srclen, destlen); | |
864 | memcpy((void *)dest, (void *)src, copylen); | |
865 | ||
866 | total_copied += copylen; | |
867 | bounce_sgl[j].offset += copylen; | |
868 | destlen -= copylen; | |
869 | dest += copylen; | |
870 | ||
871 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
872 | /* full */ | |
873 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
874 | j++; | |
875 | ||
876 | /* if we need to use another bounce buffer */ | |
877 | if (destlen || i != orig_sgl_count - 1) | |
878 | bounce_addr = | |
879 | (unsigned long)kmap_atomic( | |
880 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
881 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
882 | /* unmap the last bounce that is < PAGE_SIZE */ | |
883 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
884 | } | |
885 | } | |
886 | ||
887 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
888 | KM_IRQ0); | |
889 | } | |
890 | ||
891 | local_irq_restore(flags); | |
892 | ||
893 | return total_copied; | |
894 | } | |
895 | ||
6a8ff44b S |
896 | |
897 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
898 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
899 | struct scatterlist *bounce_sgl, | |
900 | unsigned int orig_sgl_count) | |
901 | { | |
902 | int i; | |
903 | int j = 0; | |
904 | unsigned long src, dest; | |
905 | unsigned int srclen, destlen, copylen; | |
906 | unsigned int total_copied = 0; | |
907 | unsigned long bounce_addr = 0; | |
908 | unsigned long src_addr = 0; | |
909 | unsigned long flags; | |
910 | ||
911 | local_irq_save(flags); | |
912 | ||
913 | for (i = 0; i < orig_sgl_count; i++) { | |
914 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
915 | KM_IRQ0) + orig_sgl[i].offset; | |
916 | src = src_addr; | |
917 | srclen = orig_sgl[i].length; | |
918 | ||
919 | if (bounce_addr == 0) | |
920 | bounce_addr = | |
921 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
922 | KM_IRQ0); | |
923 | ||
924 | while (srclen) { | |
925 | /* assume bounce offset always == 0 */ | |
926 | dest = bounce_addr + bounce_sgl[j].length; | |
927 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
928 | ||
929 | copylen = min(srclen, destlen); | |
930 | memcpy((void *)dest, (void *)src, copylen); | |
931 | ||
932 | total_copied += copylen; | |
933 | bounce_sgl[j].length += copylen; | |
934 | srclen -= copylen; | |
935 | src += copylen; | |
936 | ||
937 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
938 | /* full..move to next entry */ | |
939 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
940 | j++; | |
941 | ||
942 | /* if we need to use another bounce buffer */ | |
943 | if (srclen || i != orig_sgl_count - 1) | |
944 | bounce_addr = | |
945 | (unsigned long)kmap_atomic( | |
946 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
947 | ||
948 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
949 | /* unmap the last bounce that is < PAGE_SIZE */ | |
950 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
951 | } | |
952 | } | |
953 | ||
954 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
955 | } | |
956 | ||
957 | local_irq_restore(flags); | |
958 | ||
959 | return total_copied; | |
960 | } | |
961 | ||
5c5c0234 | 962 | |
5c5c0234 S |
963 | static int storvsc_remove(struct hv_device *dev) |
964 | { | |
5c5c0234 S |
965 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
966 | struct hv_host_device *host_dev = | |
967 | (struct hv_host_device *)host->hostdata; | |
968 | ||
2935a407 S |
969 | scsi_remove_host(host); |
970 | ||
2935a407 | 971 | scsi_host_put(host); |
d36b0a03 | 972 | |
6cdc57c0 | 973 | storvsc_dev_remove(dev); |
5c5c0234 S |
974 | if (host_dev->request_pool) { |
975 | kmem_cache_destroy(host_dev->request_pool); | |
976 | host_dev->request_pool = NULL; | |
977 | } | |
5c5c0234 S |
978 | return 0; |
979 | } | |
980 | ||
62838ce2 S |
981 | |
982 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
983 | sector_t capacity, int *info) | |
984 | { | |
5326fd5c S |
985 | sector_t nsect = capacity; |
986 | sector_t cylinders = nsect; | |
987 | int heads, sectors_pt; | |
62838ce2 | 988 | |
5326fd5c S |
989 | /* |
990 | * We are making up these values; let us keep it simple. | |
991 | */ | |
992 | heads = 0xff; | |
993 | sectors_pt = 0x3f; /* Sectors per track */ | |
994 | sector_div(cylinders, heads * sectors_pt); | |
995 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
996 | cylinders = 0xffff; | |
62838ce2 S |
997 | |
998 | info[0] = heads; | |
5326fd5c S |
999 | info[1] = sectors_pt; |
1000 | info[2] = (int)cylinders; | |
62838ce2 | 1001 | |
62838ce2 S |
1002 | return 0; |
1003 | } | |
aa3d789e S |
1004 | |
1005 | static int storvsc_host_reset(struct hv_device *device) | |
1006 | { | |
1007 | struct storvsc_device *stor_device; | |
1008 | struct hv_storvsc_request *request; | |
1009 | struct vstor_packet *vstor_packet; | |
1010 | int ret, t; | |
1011 | ||
aa3d789e | 1012 | |
1eaaddf9 | 1013 | stor_device = get_out_stor_device(device); |
aa3d789e | 1014 | if (!stor_device) |
f3b74165 | 1015 | return -ENODEV; |
aa3d789e S |
1016 | |
1017 | request = &stor_device->reset_request; | |
1018 | vstor_packet = &request->vstor_packet; | |
1019 | ||
1020 | init_completion(&request->wait_event); | |
1021 | ||
1022 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1023 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1024 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1025 | ||
1026 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1027 | sizeof(struct vstor_packet), | |
1028 | (unsigned long)&stor_device->reset_request, | |
1029 | VM_PKT_DATA_INBAND, | |
1030 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1031 | if (ret != 0) | |
1032 | goto cleanup; | |
1033 | ||
46d2eb6d | 1034 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
1035 | if (t == 0) { |
1036 | ret = -ETIMEDOUT; | |
1037 | goto cleanup; | |
1038 | } | |
1039 | ||
aa3d789e S |
1040 | |
1041 | /* | |
1042 | * At this point, all outstanding requests in the adapter | |
1043 | * should have been flushed out and return to us | |
1044 | */ | |
1045 | ||
1046 | cleanup: | |
aa3d789e S |
1047 | return ret; |
1048 | } | |
1049 | ||
1050 | ||
96e690be S |
1051 | /* |
1052 | * storvsc_host_reset_handler - Reset the scsi HBA | |
1053 | */ | |
1054 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
1055 | { | |
1056 | int ret; | |
1057 | struct hv_host_device *host_dev = | |
1058 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1059 | struct hv_device *dev = host_dev->dev; | |
1060 | ||
96e690be S |
1061 | ret = storvsc_host_reset(dev); |
1062 | if (ret != 0) | |
1063 | return ret; | |
1064 | ||
96e690be S |
1065 | return ret; |
1066 | } | |
1067 | ||
8a411bad S |
1068 | |
1069 | /* | |
b8de73df | 1070 | * storvsc_command_completion - Command completion processing |
8a411bad | 1071 | */ |
b8de73df | 1072 | static void storvsc_command_completion(struct hv_storvsc_request *request) |
8a411bad S |
1073 | { |
1074 | struct storvsc_cmd_request *cmd_request = | |
1075 | (struct storvsc_cmd_request *)request->context; | |
1076 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
1077 | struct hv_host_device *host_dev = | |
1078 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1079 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
1080 | struct scsi_sense_hdr sense_hdr; | |
1081 | struct vmscsi_request *vm_srb; | |
1082 | ||
3612ef99 | 1083 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 1084 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
1085 | if (vm_srb->data_in == READ_TYPE) { |
1086 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
1087 | cmd_request->bounce_sgl, |
1088 | scsi_sg_count(scmnd)); | |
3612ef99 S |
1089 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
1090 | cmd_request->bounce_sgl_count); | |
1091 | } | |
8a411bad S |
1092 | } |
1093 | ||
2544b794 S |
1094 | /* |
1095 | * If there is an error; offline the device since all | |
1096 | * error recovery strategies would have already been | |
1097 | * deployed on the host side. | |
1098 | */ | |
1099 | if (vm_srb->srb_status == 0x4) | |
1100 | scmnd->result = DID_TARGET_FAILURE << 16; | |
1101 | else | |
1102 | scmnd->result = vm_srb->scsi_status; | |
8a411bad S |
1103 | |
1104 | if (scmnd->result) { | |
1105 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1106 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1107 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1108 | } | |
1109 | ||
8a411bad S |
1110 | scsi_set_resid(scmnd, |
1111 | request->data_buffer.len - | |
1112 | vm_srb->data_transfer_length); | |
1113 | ||
1114 | scsi_done_fn = scmnd->scsi_done; | |
1115 | ||
1116 | scmnd->host_scribble = NULL; | |
1117 | scmnd->scsi_done = NULL; | |
1118 | ||
8a411bad S |
1119 | scsi_done_fn(scmnd); |
1120 | ||
1121 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1122 | } | |
1123 | ||
c5b463ae S |
1124 | |
1125 | /* | |
1126 | * storvsc_queuecommand - Initiate command processing | |
1127 | */ | |
1128 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
1129 | void (*done)(struct scsi_cmnd *)) | |
1130 | { | |
1131 | int ret; | |
1132 | struct hv_host_device *host_dev = | |
1133 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
1134 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
1135 | struct hv_storvsc_request *request; |
1136 | struct storvsc_cmd_request *cmd_request; | |
1137 | unsigned int request_size = 0; | |
1138 | int i; | |
1139 | struct scatterlist *sgl; | |
1140 | unsigned int sg_count = 0; | |
1141 | struct vmscsi_request *vm_srb; | |
1142 | ||
1143 | ||
1144 | /* If retrying, no need to prep the cmd */ | |
1145 | if (scmnd->host_scribble) { | |
c5b463ae S |
1146 | |
1147 | cmd_request = | |
1148 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
1149 | |
1150 | goto retry_request; | |
1151 | } | |
1152 | ||
c5b463ae S |
1153 | scmnd->scsi_done = done; |
1154 | ||
1155 | request_size = sizeof(struct storvsc_cmd_request); | |
1156 | ||
1157 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
1158 | GFP_ATOMIC); | |
1159 | if (!cmd_request) { | |
1160 | scmnd->scsi_done = NULL; | |
1161 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
1162 | } | |
1163 | ||
1164 | /* Setup the cmd request */ | |
1165 | cmd_request->bounce_sgl_count = 0; | |
1166 | cmd_request->bounce_sgl = NULL; | |
1167 | cmd_request->cmd = scmnd; | |
1168 | ||
1169 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1170 | ||
1171 | request = &cmd_request->request; | |
1172 | vm_srb = &request->vstor_packet.vm_srb; | |
1173 | ||
1174 | ||
1175 | /* Build the SRB */ | |
1176 | switch (scmnd->sc_data_direction) { | |
1177 | case DMA_TO_DEVICE: | |
1178 | vm_srb->data_in = WRITE_TYPE; | |
1179 | break; | |
1180 | case DMA_FROM_DEVICE: | |
1181 | vm_srb->data_in = READ_TYPE; | |
1182 | break; | |
1183 | default: | |
1184 | vm_srb->data_in = UNKNOWN_TYPE; | |
1185 | break; | |
1186 | } | |
1187 | ||
b8de73df | 1188 | request->on_io_completion = storvsc_command_completion; |
c5b463ae S |
1189 | request->context = cmd_request;/* scmnd; */ |
1190 | ||
c5b463ae S |
1191 | vm_srb->port_number = host_dev->port; |
1192 | vm_srb->path_id = scmnd->device->channel; | |
1193 | vm_srb->target_id = scmnd->device->id; | |
1194 | vm_srb->lun = scmnd->device->lun; | |
1195 | ||
c5b463ae S |
1196 | vm_srb->cdb_length = scmnd->cmd_len; |
1197 | ||
1198 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1199 | ||
1200 | request->sense_buffer = scmnd->sense_buffer; | |
1201 | ||
1202 | ||
1203 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1204 | if (scsi_sg_count(scmnd)) { | |
1205 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1206 | sg_count = scsi_sg_count(scmnd); | |
1207 | ||
1208 | /* check if we need to bounce the sgl */ | |
1209 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1210 | cmd_request->bounce_sgl = | |
1211 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
1212 | scsi_bufflen(scmnd)); | |
1213 | if (!cmd_request->bounce_sgl) { | |
1214 | scmnd->scsi_done = NULL; | |
1215 | scmnd->host_scribble = NULL; | |
1216 | kmem_cache_free(host_dev->request_pool, | |
1217 | cmd_request); | |
1218 | ||
1219 | return SCSI_MLQUEUE_HOST_BUSY; | |
1220 | } | |
1221 | ||
1222 | cmd_request->bounce_sgl_count = | |
1223 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1224 | PAGE_SHIFT; | |
1225 | ||
fa23b8c7 S |
1226 | if (vm_srb->data_in == WRITE_TYPE) |
1227 | copy_to_bounce_buffer(sgl, | |
1228 | cmd_request->bounce_sgl, | |
1229 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1230 | |
1231 | sgl = cmd_request->bounce_sgl; | |
1232 | sg_count = cmd_request->bounce_sgl_count; | |
1233 | } | |
1234 | ||
1235 | request->data_buffer.offset = sgl[0].offset; | |
1236 | ||
1237 | for (i = 0; i < sg_count; i++) | |
1238 | request->data_buffer.pfn_array[i] = | |
1239 | page_to_pfn(sg_page((&sgl[i]))); | |
1240 | ||
1241 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1242 | request->data_buffer.offset = |
1243 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1244 | request->data_buffer.pfn_array[0] = | |
1245 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1246 | } | |
1247 | ||
1248 | retry_request: | |
1249 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1250 | ret = storvsc_do_io(dev, &cmd_request->request); |
1251 | ||
d2598f01 | 1252 | if (ret == -EAGAIN) { |
c5b463ae S |
1253 | /* no more space */ |
1254 | ||
70691ec6 | 1255 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1256 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1257 | cmd_request->bounce_sgl_count); |
c5b463ae S |
1258 | |
1259 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1260 | ||
1261 | scmnd->scsi_done = NULL; | |
1262 | scmnd->host_scribble = NULL; | |
1263 | ||
1264 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1265 | } | |
1266 | ||
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
1271 | ||
bef4a34a | 1272 | |
454f18a9 | 1273 | /* Scsi driver */ |
bef4a34a | 1274 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1275 | .module = THIS_MODULE, |
1276 | .name = "storvsc_host_t", | |
1277 | .bios_param = storvsc_get_chs, | |
1278 | .queuecommand = storvsc_queuecommand, | |
1279 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1280 | .slave_alloc = storvsc_device_alloc, | |
1281 | .slave_configure = storvsc_device_configure, | |
1282 | .cmd_per_lun = 1, | |
1283 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1284 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1285 | .this_id = -1, |
454f18a9 | 1286 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1287 | /* currently 32 */ |
1288 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1289 | /* | |
1290 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1291 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1292 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1293 | * multiple | |
1294 | */ | |
454f18a9 | 1295 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1296 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1297 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1298 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1299 | }; |
1300 | ||
ef52a81b S |
1301 | enum { |
1302 | SCSI_GUID, | |
1303 | IDE_GUID, | |
1304 | }; | |
1305 | ||
d847b5fe | 1306 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1307 | /* SCSI guid */ |
1308 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1309 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1310 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1311 | /* IDE guid */ |
1312 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1313 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1314 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1315 | { }, |
d847b5fe | 1316 | }; |
bef4a34a | 1317 | |
d847b5fe | 1318 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1319 | |
bd1f5d6a | 1320 | |
3e189519 | 1321 | /* |
ff568d3a GKH |
1322 | * storvsc_probe - Add a new device for this driver |
1323 | */ | |
f5c78872 | 1324 | |
84946899 S |
1325 | static int storvsc_probe(struct hv_device *device, |
1326 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1327 | { |
ff568d3a | 1328 | int ret; |
bef4a34a | 1329 | struct Scsi_Host *host; |
795b613d | 1330 | struct hv_host_device *host_dev; |
ef52a81b | 1331 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a S |
1332 | int path = 0; |
1333 | int target = 0; | |
6e4198ce | 1334 | struct storvsc_device *stor_device; |
bd1f5d6a | 1335 | |
ff568d3a | 1336 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1337 | sizeof(struct hv_host_device)); |
f8feed06 | 1338 | if (!host) |
bef4a34a | 1339 | return -ENOMEM; |
bef4a34a | 1340 | |
9efd21e1 | 1341 | dev_set_drvdata(&device->device, host); |
bef4a34a | 1342 | |
795b613d S |
1343 | host_dev = (struct hv_host_device *)host->hostdata; |
1344 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 1345 | |
795b613d | 1346 | host_dev->port = host->host_no; |
97c15296 | 1347 | host_dev->dev = device; |
bef4a34a | 1348 | |
795b613d | 1349 | host_dev->request_pool = |
9efd21e1 | 1350 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1351 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1352 | SLAB_HWCACHE_ALIGN, NULL); |
1353 | ||
795b613d | 1354 | if (!host_dev->request_pool) { |
bef4a34a | 1355 | scsi_host_put(host); |
bef4a34a HJ |
1356 | return -ENOMEM; |
1357 | } | |
1358 | ||
a13d35ab | 1359 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce S |
1360 | if (!stor_device) { |
1361 | kmem_cache_destroy(host_dev->request_pool); | |
1362 | scsi_host_put(host); | |
1363 | return -ENOMEM; | |
1364 | } | |
9efd21e1 | 1365 | |
a13d35ab S |
1366 | stor_device->destroy = false; |
1367 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1368 | stor_device->device = device; | |
1369 | device->ext = stor_device; | |
1370 | ||
6e4198ce S |
1371 | stor_device->port_number = host->host_no; |
1372 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
1373 | if (ret) { | |
795b613d | 1374 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 1375 | scsi_host_put(host); |
6e4198ce S |
1376 | kfree(stor_device); |
1377 | return ret; | |
bef4a34a HJ |
1378 | } |
1379 | ||
bd1f5d6a S |
1380 | if (dev_is_ide) |
1381 | storvsc_get_ide_info(device, &target, &path); | |
1382 | ||
6e4198ce S |
1383 | host_dev->path = stor_device->path_id; |
1384 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1385 | |
ff568d3a GKH |
1386 | /* max # of devices per target */ |
1387 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1388 | /* max # of targets per channel */ | |
1389 | host->max_id = STORVSC_MAX_TARGETS; | |
1390 | /* max # of channels */ | |
1391 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1392 | /* max cmd length */ |
1393 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1394 | |
454f18a9 | 1395 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1396 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a S |
1397 | if (ret != 0) |
1398 | goto err_out; | |
bef4a34a | 1399 | |
bd1f5d6a S |
1400 | if (!dev_is_ide) { |
1401 | scsi_scan_host(host); | |
1402 | return 0; | |
1403 | } | |
1404 | ret = scsi_add_device(host, 0, target, 0); | |
1405 | if (ret) { | |
1406 | scsi_remove_host(host); | |
1407 | goto err_out; | |
bef4a34a | 1408 | } |
bd1f5d6a | 1409 | return 0; |
bef4a34a | 1410 | |
bd1f5d6a S |
1411 | err_out: |
1412 | storvsc_dev_remove(device); | |
1413 | kmem_cache_destroy(host_dev->request_pool); | |
1414 | scsi_host_put(host); | |
1415 | return -ENODEV; | |
bef4a34a HJ |
1416 | } |
1417 | ||
7bd05b91 S |
1418 | /* The one and only one */ |
1419 | ||
40bf63ed | 1420 | static struct hv_driver storvsc_drv = { |
768fa219 | 1421 | .name = "storvsc", |
d847b5fe | 1422 | .id_table = id_table, |
40bf63ed S |
1423 | .probe = storvsc_probe, |
1424 | .remove = storvsc_remove, | |
39ae6fae | 1425 | }; |
7bd05b91 | 1426 | |
d9bbae83 | 1427 | static int __init storvsc_drv_init(void) |
f5c78872 | 1428 | { |
01415ab3 S |
1429 | u32 max_outstanding_req_per_channel; |
1430 | ||
1431 | /* | |
1432 | * Divide the ring buffer data size (which is 1 page less | |
1433 | * than the ring buffer size since that page is reserved for | |
1434 | * the ring buffer indices) by the max request size (which is | |
1435 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1436 | */ | |
01415ab3 | 1437 | max_outstanding_req_per_channel = |
768fa219 GKH |
1438 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1439 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1440 | sizeof(struct vstor_packet) + sizeof(u64), | |
1441 | sizeof(u64))); | |
f5c78872 | 1442 | |
01415ab3 | 1443 | if (max_outstanding_req_per_channel < |
f5c78872 | 1444 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1445 | return -EINVAL; |
f5c78872 | 1446 | |
768fa219 | 1447 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1448 | } |
1449 | ||
c63ba9e1 | 1450 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1451 | { |
768fa219 | 1452 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1453 | } |
1454 | ||
ff568d3a | 1455 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1456 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1457 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1458 | module_init(storvsc_drv_init); |
c63ba9e1 | 1459 | module_exit(storvsc_drv_exit); |