Commit | Line | Data |
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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
a1be1706 S |
22 | |
23 | #include <linux/kernel.h> | |
f0d79fe9 | 24 | #include <linux/wait.h> |
a1be1706 S |
25 | #include <linux/sched.h> |
26 | #include <linux/completion.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/delay.h> | |
bef4a34a | 30 | #include <linux/init.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
bef4a34a HJ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> | |
46a97191 | 34 | #include <linux/hyperv.h> |
56b26e69 | 35 | #include <linux/blkdev.h> |
bef4a34a HJ |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_tcq.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 43 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 44 | |
09f0355f | 45 | /* |
af9584b8 S |
46 | * All wire protocol details (storage protocol between the guest and the host) |
47 | * are consolidated here. | |
48 | * | |
49 | * Begin protocol definitions. | |
09f0355f S |
50 | */ |
51 | ||
09f0355f S |
52 | /* |
53 | * Version history: | |
54 | * V1 Beta: 0.1 | |
55 | * V1 RC < 2008/1/31: 1.0 | |
56 | * V1 RC > 2008/1/31: 2.0 | |
57 | * Win7: 4.2 | |
8b612fa2 | 58 | * Win8: 5.1 |
09f0355f S |
59 | */ |
60 | ||
8b612fa2 S |
61 | |
62 | #define VMSTOR_WIN7_MAJOR 4 | |
63 | #define VMSTOR_WIN7_MINOR 2 | |
64 | ||
65 | #define VMSTOR_WIN8_MAJOR 5 | |
66 | #define VMSTOR_WIN8_MINOR 1 | |
f0d79fe9 S |
67 | |
68 | ||
f0d79fe9 S |
69 | /* Packet structure describing virtual storage requests. */ |
70 | enum vstor_packet_operation { | |
71 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
72 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
73 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
74 | VSTOR_OPERATION_RESET_LUN = 4, | |
75 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
76 | VSTOR_OPERATION_RESET_BUS = 6, | |
77 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
78 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
79 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
80 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 81 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
82 | VSTOR_OPERATION_FCHBA_DATA = 12, |
83 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
84 | VSTOR_OPERATION_MAXIMUM = 13 | |
85 | }; | |
86 | ||
87 | /* | |
88 | * WWN packet for Fibre Channel HBA | |
89 | */ | |
90 | ||
91 | struct hv_fc_wwn_packet { | |
92 | bool primary_active; | |
93 | u8 reserved1; | |
94 | u8 reserved2; | |
95 | u8 primary_port_wwn[8]; | |
96 | u8 primary_node_wwn[8]; | |
97 | u8 secondary_port_wwn[8]; | |
98 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
99 | }; |
100 | ||
8b612fa2 S |
101 | |
102 | ||
103 | /* | |
104 | * SRB Flag Bits | |
105 | */ | |
106 | ||
107 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
108 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
109 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
110 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
111 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
112 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
113 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
114 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
115 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
116 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
117 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
118 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
119 | ||
120 | /* | |
121 | * This flag indicates the request is part of the workflow for processing a D3. | |
122 | */ | |
123 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
124 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
125 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
126 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
127 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
128 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
129 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
130 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
131 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
132 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
133 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
134 | ||
135 | ||
f0d79fe9 S |
136 | /* |
137 | * Platform neutral description of a scsi request - | |
138 | * this remains the same across the write regardless of 32/64 bit | |
139 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
140 | */ | |
6b2f9495 | 141 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
142 | |
143 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
144 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
145 | ||
146 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 147 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 148 | |
8b612fa2 S |
149 | /* |
150 | * Sense buffer size changed in win8; have a run-time | |
151 | * variable to track the size we should use. | |
152 | */ | |
153 | static int sense_buffer_size; | |
154 | ||
155 | /* | |
156 | * The size of the vmscsi_request has changed in win8. The | |
157 | * additional size is because of new elements added to the | |
158 | * structure. These elements are valid only when we are talking | |
159 | * to a win8 host. | |
160 | * Track the correction to size we need to apply. | |
161 | */ | |
162 | ||
163 | static int vmscsi_size_delta; | |
164 | static int vmstor_current_major; | |
165 | static int vmstor_current_minor; | |
166 | ||
167 | struct vmscsi_win8_extension { | |
168 | /* | |
169 | * The following were added in Windows 8 | |
170 | */ | |
171 | u16 reserve; | |
172 | u8 queue_tag; | |
173 | u8 queue_action; | |
174 | u32 srb_flags; | |
175 | u32 time_out_value; | |
176 | u32 queue_sort_ey; | |
177 | } __packed; | |
178 | ||
f0d79fe9 | 179 | struct vmscsi_request { |
c649114a S |
180 | u16 length; |
181 | u8 srb_status; | |
182 | u8 scsi_status; | |
f0d79fe9 | 183 | |
c649114a S |
184 | u8 port_number; |
185 | u8 path_id; | |
186 | u8 target_id; | |
187 | u8 lun; | |
f0d79fe9 | 188 | |
c649114a S |
189 | u8 cdb_length; |
190 | u8 sense_info_length; | |
191 | u8 data_in; | |
192 | u8 reserved; | |
f0d79fe9 | 193 | |
c649114a | 194 | u32 data_transfer_length; |
f0d79fe9 S |
195 | |
196 | union { | |
6b2f9495 S |
197 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
198 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
199 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 200 | }; |
8b612fa2 S |
201 | /* |
202 | * The following was added in win8. | |
203 | */ | |
204 | struct vmscsi_win8_extension win8_extension; | |
205 | ||
f0d79fe9 S |
206 | } __attribute((packed)); |
207 | ||
208 | ||
209 | /* | |
210 | * This structure is sent during the intialization phase to get the different | |
211 | * properties of the channel. | |
212 | */ | |
8b612fa2 S |
213 | |
214 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
215 | ||
f0d79fe9 | 216 | struct vmstorage_channel_properties { |
8b612fa2 S |
217 | u32 reserved; |
218 | u16 max_channel_cnt; | |
219 | u16 reserved1; | |
f0d79fe9 | 220 | |
8b612fa2 | 221 | u32 flags; |
c649114a | 222 | u32 max_transfer_bytes; |
f0d79fe9 | 223 | |
8b612fa2 | 224 | u64 reserved2; |
f0d79fe9 S |
225 | } __packed; |
226 | ||
227 | /* This structure is sent during the storage protocol negotiations. */ | |
228 | struct vmstorage_protocol_version { | |
229 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 230 | u16 major_minor; |
f0d79fe9 S |
231 | |
232 | /* | |
233 | * Revision number is auto-incremented whenever this file is changed | |
234 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
235 | * definitely indicate incompatibility--but it does indicate mismatched | |
236 | * builds. | |
c649114a | 237 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 238 | */ |
85904a5e | 239 | u16 revision; |
f0d79fe9 S |
240 | } __packed; |
241 | ||
242 | /* Channel Property Flags */ | |
243 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
244 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
245 | ||
246 | struct vstor_packet { | |
247 | /* Requested operation type */ | |
248 | enum vstor_packet_operation operation; | |
249 | ||
250 | /* Flags - see below for values */ | |
c649114a | 251 | u32 flags; |
f0d79fe9 S |
252 | |
253 | /* Status of the request returned from the server side. */ | |
c649114a | 254 | u32 status; |
f0d79fe9 S |
255 | |
256 | /* Data payload area */ | |
257 | union { | |
258 | /* | |
259 | * Structure used to forward SCSI commands from the | |
260 | * client to the server. | |
261 | */ | |
262 | struct vmscsi_request vm_srb; | |
263 | ||
264 | /* Structure used to query channel properties. */ | |
265 | struct vmstorage_channel_properties storage_channel_properties; | |
266 | ||
267 | /* Used during version negotiations. */ | |
268 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
269 | |
270 | /* Fibre channel address packet */ | |
271 | struct hv_fc_wwn_packet wwn_packet; | |
272 | ||
273 | /* Number of sub-channels to create */ | |
274 | u16 sub_channel_count; | |
275 | ||
276 | /* This will be the maximum of the union members */ | |
277 | u8 buffer[0x34]; | |
f0d79fe9 S |
278 | }; |
279 | } __packed; | |
280 | ||
f0d79fe9 | 281 | /* |
09f0355f S |
282 | * Packet Flags: |
283 | * | |
f0d79fe9 S |
284 | * This flag indicates that the server should send back a completion for this |
285 | * packet. | |
286 | */ | |
09f0355f | 287 | |
f0d79fe9 S |
288 | #define REQUEST_COMPLETION_FLAG 0x1 |
289 | ||
f0d79fe9 S |
290 | /* Matches Windows-end */ |
291 | enum storvsc_request_type { | |
c649114a | 292 | WRITE_TYPE = 0, |
f0d79fe9 S |
293 | READ_TYPE, |
294 | UNKNOWN_TYPE, | |
295 | }; | |
296 | ||
16046320 S |
297 | /* |
298 | * SRB status codes and masks; a subset of the codes used here. | |
299 | */ | |
300 | ||
301 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
302 | #define SRB_STATUS_INVALID_LUN 0x20 | |
303 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 304 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
305 | #define SRB_STATUS_ERROR 0x04 |
306 | ||
af9584b8 S |
307 | /* |
308 | * This is the end of Protocol specific defines. | |
309 | */ | |
310 | ||
af9584b8 S |
311 | static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); |
312 | ||
313 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
314 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
315 | ||
893def38 S |
316 | /* |
317 | * Timeout in seconds for all devices managed by this driver. | |
318 | */ | |
319 | static int storvsc_timeout = 180; | |
320 | ||
f3cfabce S |
321 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
322 | ||
bb6a4df6 | 323 | #define STORVSC_MAX_IO_REQUESTS 200 |
af9584b8 | 324 | |
6f94d5de S |
325 | static void storvsc_on_channel_callback(void *context); |
326 | ||
4cd83ecd S |
327 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
328 | #define STORVSC_MAX_TARGETS 2 | |
329 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 330 | |
4cd83ecd S |
331 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
332 | #define STORVSC_FC_MAX_TARGETS 128 | |
333 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 334 | |
4cd83ecd S |
335 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
336 | #define STORVSC_IDE_MAX_TARGETS 1 | |
337 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 338 | |
61eaffc9 | 339 | struct storvsc_cmd_request { |
61eaffc9 S |
340 | struct scsi_cmnd *cmd; |
341 | ||
342 | unsigned int bounce_sgl_count; | |
343 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 344 | |
f0d79fe9 S |
345 | struct hv_device *device; |
346 | ||
347 | /* Synchronize the request/response if needed */ | |
348 | struct completion wait_event; | |
349 | ||
f0d79fe9 | 350 | struct hv_multipage_buffer data_buffer; |
f0d79fe9 S |
351 | struct vstor_packet vstor_packet; |
352 | }; | |
353 | ||
354 | ||
f0d79fe9 S |
355 | /* A storvsc device is a device object that contains a vmbus channel */ |
356 | struct storvsc_device { | |
357 | struct hv_device *device; | |
358 | ||
359 | bool destroy; | |
360 | bool drain_notify; | |
6f94d5de | 361 | bool open_sub_channel; |
f0d79fe9 | 362 | atomic_t num_outstanding_req; |
cd654ea1 | 363 | struct Scsi_Host *host; |
f0d79fe9 S |
364 | |
365 | wait_queue_head_t waiting_to_drain; | |
366 | ||
367 | /* | |
368 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
369 | * controller. In reality, the pathid, targetid is always 0 | |
370 | * and the port is set by us | |
371 | */ | |
372 | unsigned int port_number; | |
373 | unsigned char path_id; | |
374 | unsigned char target_id; | |
375 | ||
376 | /* Used for vsc/vsp channel reset process */ | |
61eaffc9 S |
377 | struct storvsc_cmd_request init_request; |
378 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
379 | }; |
380 | ||
ce3e301c S |
381 | struct hv_host_device { |
382 | struct hv_device *dev; | |
c1b3d067 S |
383 | unsigned int port; |
384 | unsigned char path; | |
385 | unsigned char target; | |
386 | }; | |
387 | ||
12675799 S |
388 | struct storvsc_scan_work { |
389 | struct work_struct work; | |
390 | struct Scsi_Host *host; | |
391 | uint lun; | |
392 | }; | |
393 | ||
6781209e S |
394 | static void storvsc_device_scan(struct work_struct *work) |
395 | { | |
396 | struct storvsc_scan_work *wrk; | |
397 | uint lun; | |
398 | struct scsi_device *sdev; | |
399 | ||
400 | wrk = container_of(work, struct storvsc_scan_work, work); | |
401 | lun = wrk->lun; | |
402 | ||
403 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
404 | if (!sdev) | |
405 | goto done; | |
406 | scsi_rescan_device(&sdev->sdev_gendev); | |
407 | scsi_device_put(sdev); | |
408 | ||
409 | done: | |
410 | kfree(wrk); | |
411 | } | |
412 | ||
2a09ed3d | 413 | static void storvsc_host_scan(struct work_struct *work) |
12675799 S |
414 | { |
415 | struct storvsc_scan_work *wrk; | |
2a09ed3d | 416 | struct Scsi_Host *host; |
34a716bc S |
417 | struct scsi_device *sdev; |
418 | unsigned long flags; | |
12675799 S |
419 | |
420 | wrk = container_of(work, struct storvsc_scan_work, work); | |
2a09ed3d S |
421 | host = wrk->host; |
422 | ||
34a716bc S |
423 | /* |
424 | * Before scanning the host, first check to see if any of the | |
425 | * currrently known devices have been hot removed. We issue a | |
426 | * "unit ready" command against all currently known devices. | |
427 | * This I/O will result in an error for devices that have been | |
428 | * removed. As part of handling the I/O error, we remove the device. | |
429 | * | |
430 | * When a LUN is added or removed, the host sends us a signal to | |
431 | * scan the host. Thus we are forced to discover the LUNs that | |
432 | * may have been removed this way. | |
433 | */ | |
434 | mutex_lock(&host->scan_mutex); | |
435 | spin_lock_irqsave(host->host_lock, flags); | |
436 | list_for_each_entry(sdev, &host->__devices, siblings) { | |
437 | spin_unlock_irqrestore(host->host_lock, flags); | |
438 | scsi_test_unit_ready(sdev, 1, 1, NULL); | |
439 | spin_lock_irqsave(host->host_lock, flags); | |
440 | continue; | |
441 | } | |
442 | spin_unlock_irqrestore(host->host_lock, flags); | |
443 | mutex_unlock(&host->scan_mutex); | |
444 | /* | |
445 | * Now scan the host to discover LUNs that may have been added. | |
446 | */ | |
2a09ed3d S |
447 | scsi_scan_host(host); |
448 | ||
12675799 S |
449 | kfree(wrk); |
450 | } | |
451 | ||
b4017319 S |
452 | static void storvsc_remove_lun(struct work_struct *work) |
453 | { | |
454 | struct storvsc_scan_work *wrk; | |
455 | struct scsi_device *sdev; | |
456 | ||
457 | wrk = container_of(work, struct storvsc_scan_work, work); | |
458 | if (!scsi_host_get(wrk->host)) | |
459 | goto done; | |
460 | ||
461 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
462 | ||
463 | if (sdev) { | |
464 | scsi_remove_device(sdev); | |
465 | scsi_device_put(sdev); | |
466 | } | |
467 | scsi_host_put(wrk->host); | |
468 | ||
469 | done: | |
470 | kfree(wrk); | |
471 | } | |
472 | ||
af9584b8 S |
473 | /* |
474 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
475 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
476 | */ | |
477 | ||
478 | static inline u16 storvsc_get_version(u8 major, u8 minor) | |
479 | { | |
480 | u16 version; | |
481 | ||
482 | version = ((major << 8) | minor); | |
483 | return version; | |
484 | } | |
485 | ||
a8c18c57 S |
486 | /* |
487 | * We can get incoming messages from the host that are not in response to | |
488 | * messages that we have sent out. An example of this would be messages | |
489 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
490 | * deal with potential race conditions where the driver may be in the | |
491 | * midst of being unloaded when we might receive an unsolicited message | |
492 | * from the host, we have implemented a mechanism to gurantee sequential | |
493 | * consistency: | |
494 | * | |
495 | * 1) Once the device is marked as being destroyed, we will fail all | |
496 | * outgoing messages. | |
497 | * 2) We permit incoming messages when the device is being destroyed, | |
498 | * only to properly account for messages already sent out. | |
499 | */ | |
500 | ||
f0d79fe9 S |
501 | static inline struct storvsc_device *get_out_stor_device( |
502 | struct hv_device *device) | |
503 | { | |
504 | struct storvsc_device *stor_device; | |
505 | ||
cd654ea1 | 506 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
507 | |
508 | if (stor_device && stor_device->destroy) | |
509 | stor_device = NULL; | |
510 | ||
511 | return stor_device; | |
512 | } | |
513 | ||
514 | ||
515 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
516 | { | |
517 | dev->drain_notify = true; | |
518 | wait_event(dev->waiting_to_drain, | |
519 | atomic_read(&dev->num_outstanding_req) == 0); | |
520 | dev->drain_notify = false; | |
521 | } | |
bef4a34a | 522 | |
8dcf37d4 S |
523 | static inline struct storvsc_device *get_in_stor_device( |
524 | struct hv_device *device) | |
525 | { | |
526 | struct storvsc_device *stor_device; | |
8dcf37d4 | 527 | |
cd654ea1 | 528 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
529 | |
530 | if (!stor_device) | |
531 | goto get_in_err; | |
532 | ||
533 | /* | |
534 | * If the device is being destroyed; allow incoming | |
535 | * traffic only to cleanup outstanding requests. | |
536 | */ | |
537 | ||
538 | if (stor_device->destroy && | |
539 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
540 | stor_device = NULL; | |
541 | ||
542 | get_in_err: | |
8dcf37d4 S |
543 | return stor_device; |
544 | ||
545 | } | |
546 | ||
2707388c S |
547 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
548 | unsigned int sg_count) | |
549 | { | |
550 | int i; | |
551 | struct page *page_buf; | |
552 | ||
553 | for (i = 0; i < sg_count; i++) { | |
554 | page_buf = sg_page((&sgl[i])); | |
555 | if (page_buf != NULL) | |
556 | __free_page(page_buf); | |
557 | } | |
558 | ||
559 | kfree(sgl); | |
560 | } | |
561 | ||
562 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
563 | { | |
564 | int i; | |
565 | ||
566 | /* No need to check */ | |
567 | if (sg_count < 2) | |
568 | return -1; | |
569 | ||
570 | /* We have at least 2 sg entries */ | |
571 | for (i = 0; i < sg_count; i++) { | |
572 | if (i == 0) { | |
573 | /* make sure 1st one does not have hole */ | |
574 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
575 | return i; | |
576 | } else if (i == sg_count - 1) { | |
577 | /* make sure last one does not have hole */ | |
578 | if (sgl[i].offset != 0) | |
579 | return i; | |
580 | } else { | |
581 | /* make sure no hole in the middle */ | |
582 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
583 | return i; | |
584 | } | |
585 | } | |
586 | return -1; | |
587 | } | |
588 | ||
589 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
590 | unsigned int sg_count, | |
591 | unsigned int len, | |
592 | int write) | |
593 | { | |
594 | int i; | |
595 | int num_pages; | |
596 | struct scatterlist *bounce_sgl; | |
597 | struct page *page_buf; | |
598 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
599 | ||
600 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
601 | ||
602 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
603 | if (!bounce_sgl) | |
604 | return NULL; | |
605 | ||
9d2696e6 | 606 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
607 | for (i = 0; i < num_pages; i++) { |
608 | page_buf = alloc_page(GFP_ATOMIC); | |
609 | if (!page_buf) | |
610 | goto cleanup; | |
611 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
612 | } | |
613 | ||
614 | return bounce_sgl; | |
615 | ||
616 | cleanup: | |
617 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
618 | return NULL; | |
619 | } | |
620 | ||
9f393834 LT |
621 | /* Disgusting wrapper functions */ |
622 | static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) | |
623 | { | |
624 | void *addr = kmap_atomic(sg_page(sgl + idx)); | |
625 | return (unsigned long)addr; | |
626 | } | |
8dcf37d4 | 627 | |
9f393834 LT |
628 | static inline void sg_kunmap_atomic(unsigned long addr) |
629 | { | |
630 | kunmap_atomic((void *)addr); | |
631 | } | |
8dcf37d4 | 632 | |
8dcf37d4 | 633 | |
2707388c S |
634 | /* Assume the original sgl has enough room */ |
635 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
636 | struct scatterlist *bounce_sgl, | |
637 | unsigned int orig_sgl_count, | |
638 | unsigned int bounce_sgl_count) | |
639 | { | |
640 | int i; | |
641 | int j = 0; | |
642 | unsigned long src, dest; | |
643 | unsigned int srclen, destlen, copylen; | |
644 | unsigned int total_copied = 0; | |
645 | unsigned long bounce_addr = 0; | |
646 | unsigned long dest_addr = 0; | |
647 | unsigned long flags; | |
648 | ||
649 | local_irq_save(flags); | |
650 | ||
651 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 652 | dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
653 | dest = dest_addr; |
654 | destlen = orig_sgl[i].length; | |
655 | ||
656 | if (bounce_addr == 0) | |
9f393834 | 657 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
658 | |
659 | while (destlen) { | |
660 | src = bounce_addr + bounce_sgl[j].offset; | |
661 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
662 | ||
663 | copylen = min(srclen, destlen); | |
664 | memcpy((void *)dest, (void *)src, copylen); | |
665 | ||
666 | total_copied += copylen; | |
667 | bounce_sgl[j].offset += copylen; | |
668 | destlen -= copylen; | |
669 | dest += copylen; | |
670 | ||
671 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
672 | /* full */ | |
9f393834 | 673 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
674 | j++; |
675 | ||
676 | /* | |
677 | * It is possible that the number of elements | |
678 | * in the bounce buffer may not be equal to | |
679 | * the number of elements in the original | |
680 | * scatter list. Handle this correctly. | |
681 | */ | |
682 | ||
683 | if (j == bounce_sgl_count) { | |
684 | /* | |
685 | * We are done; cleanup and return. | |
686 | */ | |
9f393834 | 687 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
688 | local_irq_restore(flags); |
689 | return total_copied; | |
690 | } | |
691 | ||
692 | /* if we need to use another bounce buffer */ | |
693 | if (destlen || i != orig_sgl_count - 1) | |
9f393834 | 694 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
695 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
696 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 697 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
698 | } |
699 | } | |
700 | ||
9f393834 | 701 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
702 | } |
703 | ||
704 | local_irq_restore(flags); | |
705 | ||
706 | return total_copied; | |
707 | } | |
708 | ||
709 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
710 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
711 | struct scatterlist *bounce_sgl, | |
712 | unsigned int orig_sgl_count) | |
713 | { | |
714 | int i; | |
715 | int j = 0; | |
716 | unsigned long src, dest; | |
717 | unsigned int srclen, destlen, copylen; | |
718 | unsigned int total_copied = 0; | |
719 | unsigned long bounce_addr = 0; | |
720 | unsigned long src_addr = 0; | |
721 | unsigned long flags; | |
722 | ||
723 | local_irq_save(flags); | |
724 | ||
725 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 726 | src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
727 | src = src_addr; |
728 | srclen = orig_sgl[i].length; | |
729 | ||
730 | if (bounce_addr == 0) | |
9f393834 | 731 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
732 | |
733 | while (srclen) { | |
734 | /* assume bounce offset always == 0 */ | |
735 | dest = bounce_addr + bounce_sgl[j].length; | |
736 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
737 | ||
738 | copylen = min(srclen, destlen); | |
739 | memcpy((void *)dest, (void *)src, copylen); | |
740 | ||
741 | total_copied += copylen; | |
742 | bounce_sgl[j].length += copylen; | |
743 | srclen -= copylen; | |
744 | src += copylen; | |
745 | ||
746 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
747 | /* full..move to next entry */ | |
9f393834 | 748 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
749 | j++; |
750 | ||
751 | /* if we need to use another bounce buffer */ | |
752 | if (srclen || i != orig_sgl_count - 1) | |
9f393834 | 753 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
754 | |
755 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
756 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 757 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
758 | } |
759 | } | |
760 | ||
9f393834 | 761 | sg_kunmap_atomic(src_addr - orig_sgl[i].offset); |
2707388c S |
762 | } |
763 | ||
764 | local_irq_restore(flags); | |
765 | ||
766 | return total_copied; | |
767 | } | |
768 | ||
6f94d5de S |
769 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
770 | { | |
771 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
772 | struct storvsc_device *stor_device; | |
773 | struct vmstorage_channel_properties props; | |
774 | ||
775 | stor_device = get_out_stor_device(device); | |
776 | if (!stor_device) | |
777 | return; | |
778 | ||
779 | if (stor_device->open_sub_channel == false) | |
780 | return; | |
781 | ||
782 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
783 | ||
784 | vmbus_open(new_sc, | |
785 | storvsc_ringbuffer_size, | |
786 | storvsc_ringbuffer_size, | |
787 | (void *)&props, | |
788 | sizeof(struct vmstorage_channel_properties), | |
789 | storvsc_on_channel_callback, new_sc); | |
790 | } | |
791 | ||
792 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
793 | { | |
794 | struct storvsc_device *stor_device; | |
795 | int num_cpus = num_online_cpus(); | |
796 | int num_sc; | |
797 | struct storvsc_cmd_request *request; | |
798 | struct vstor_packet *vstor_packet; | |
799 | int ret, t; | |
800 | ||
801 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
802 | stor_device = get_out_stor_device(device); | |
803 | if (!stor_device) | |
804 | return; | |
805 | ||
806 | request = &stor_device->init_request; | |
807 | vstor_packet = &request->vstor_packet; | |
808 | ||
809 | stor_device->open_sub_channel = true; | |
810 | /* | |
811 | * Establish a handler for dealing with subchannels. | |
812 | */ | |
813 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
814 | ||
815 | /* | |
816 | * Check to see if sub-channels have already been created. This | |
817 | * can happen when this driver is re-loaded after unloading. | |
818 | */ | |
819 | ||
820 | if (vmbus_are_subchannels_present(device->channel)) | |
821 | return; | |
822 | ||
823 | stor_device->open_sub_channel = false; | |
824 | /* | |
825 | * Request the host to create sub-channels. | |
826 | */ | |
827 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
828 | init_completion(&request->wait_event); | |
829 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
830 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
831 | vstor_packet->sub_channel_count = num_sc; | |
832 | ||
833 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
834 | (sizeof(struct vstor_packet) - | |
835 | vmscsi_size_delta), | |
836 | (unsigned long)request, | |
837 | VM_PKT_DATA_INBAND, | |
838 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
839 | ||
840 | if (ret != 0) | |
841 | return; | |
842 | ||
843 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
844 | if (t == 0) | |
845 | return; | |
846 | ||
847 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
848 | vstor_packet->status != 0) | |
849 | return; | |
850 | ||
851 | /* | |
852 | * Now that we created the sub-channels, invoke the check; this | |
853 | * may trigger the callback. | |
854 | */ | |
855 | stor_device->open_sub_channel = true; | |
856 | vmbus_are_subchannels_present(device->channel); | |
857 | } | |
858 | ||
8dcf37d4 S |
859 | static int storvsc_channel_init(struct hv_device *device) |
860 | { | |
861 | struct storvsc_device *stor_device; | |
61eaffc9 | 862 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
863 | struct vstor_packet *vstor_packet; |
864 | int ret, t; | |
6f94d5de S |
865 | int max_chns; |
866 | bool process_sub_channels = false; | |
8dcf37d4 S |
867 | |
868 | stor_device = get_out_stor_device(device); | |
869 | if (!stor_device) | |
870 | return -ENODEV; | |
871 | ||
872 | request = &stor_device->init_request; | |
873 | vstor_packet = &request->vstor_packet; | |
874 | ||
875 | /* | |
876 | * Now, initiate the vsc/vsp initialization protocol on the open | |
877 | * channel | |
878 | */ | |
61eaffc9 | 879 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
880 | init_completion(&request->wait_event); |
881 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
882 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
883 | ||
884 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
885 | (sizeof(struct vstor_packet) - |
886 | vmscsi_size_delta), | |
8dcf37d4 S |
887 | (unsigned long)request, |
888 | VM_PKT_DATA_INBAND, | |
889 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
890 | if (ret != 0) | |
891 | goto cleanup; | |
892 | ||
893 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
894 | if (t == 0) { | |
895 | ret = -ETIMEDOUT; | |
896 | goto cleanup; | |
897 | } | |
898 | ||
899 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
900 | vstor_packet->status != 0) | |
901 | goto cleanup; | |
902 | ||
903 | ||
904 | /* reuse the packet for version range supported */ | |
905 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
906 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
907 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
908 | ||
85904a5e | 909 | vstor_packet->version.major_minor = |
8b612fa2 | 910 | storvsc_get_version(vmstor_current_major, vmstor_current_minor); |
85904a5e S |
911 | |
912 | /* | |
913 | * The revision number is only used in Windows; set it to 0. | |
914 | */ | |
c649114a | 915 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
916 | |
917 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
918 | (sizeof(struct vstor_packet) - |
919 | vmscsi_size_delta), | |
8dcf37d4 S |
920 | (unsigned long)request, |
921 | VM_PKT_DATA_INBAND, | |
922 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
923 | if (ret != 0) | |
924 | goto cleanup; | |
925 | ||
926 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
927 | if (t == 0) { | |
928 | ret = -ETIMEDOUT; | |
929 | goto cleanup; | |
930 | } | |
931 | ||
932 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
933 | vstor_packet->status != 0) | |
934 | goto cleanup; | |
935 | ||
936 | ||
937 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
938 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
939 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 S |
940 | |
941 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
942 | (sizeof(struct vstor_packet) - |
943 | vmscsi_size_delta), | |
8dcf37d4 S |
944 | (unsigned long)request, |
945 | VM_PKT_DATA_INBAND, | |
946 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
947 | ||
948 | if (ret != 0) | |
949 | goto cleanup; | |
950 | ||
951 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
952 | if (t == 0) { | |
953 | ret = -ETIMEDOUT; | |
954 | goto cleanup; | |
955 | } | |
956 | ||
957 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
958 | vstor_packet->status != 0) | |
959 | goto cleanup; | |
960 | ||
6f94d5de S |
961 | /* |
962 | * Check to see if multi-channel support is there. | |
963 | * Hosts that implement protocol version of 5.1 and above | |
964 | * support multi-channel. | |
965 | */ | |
966 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
967 | if ((vmbus_proto_version != VERSION_WIN7) && | |
968 | (vmbus_proto_version != VERSION_WS2008)) { | |
969 | if (vstor_packet->storage_channel_properties.flags & | |
970 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
971 | process_sub_channels = true; | |
972 | } | |
973 | ||
8dcf37d4 S |
974 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
975 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
976 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
977 | ||
978 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
979 | (sizeof(struct vstor_packet) - |
980 | vmscsi_size_delta), | |
8dcf37d4 S |
981 | (unsigned long)request, |
982 | VM_PKT_DATA_INBAND, | |
983 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
984 | ||
985 | if (ret != 0) | |
986 | goto cleanup; | |
987 | ||
988 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
989 | if (t == 0) { | |
990 | ret = -ETIMEDOUT; | |
991 | goto cleanup; | |
992 | } | |
993 | ||
994 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
995 | vstor_packet->status != 0) | |
996 | goto cleanup; | |
997 | ||
6f94d5de S |
998 | if (process_sub_channels) |
999 | handle_multichannel_storage(device, max_chns); | |
1000 | ||
8dcf37d4 S |
1001 | |
1002 | cleanup: | |
1003 | return ret; | |
1004 | } | |
1005 | ||
c50bd448 S |
1006 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1007 | struct scsi_cmnd *scmnd, | |
1008 | struct Scsi_Host *host, | |
1009 | u8 asc, u8 ascq) | |
1010 | { | |
1011 | struct storvsc_scan_work *wrk; | |
1012 | void (*process_err_fn)(struct work_struct *work); | |
1013 | bool do_work = false; | |
1014 | ||
1015 | switch (vm_srb->srb_status) { | |
1016 | case SRB_STATUS_ERROR: | |
1017 | /* | |
1018 | * If there is an error; offline the device since all | |
1019 | * error recovery strategies would have already been | |
1020 | * deployed on the host side. However, if the command | |
1021 | * were a pass-through command deal with it appropriately. | |
1022 | */ | |
1023 | switch (scmnd->cmnd[0]) { | |
1024 | case ATA_16: | |
1025 | case ATA_12: | |
1026 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1027 | break; | |
3533f860 S |
1028 | /* |
1029 | * On Some Windows hosts TEST_UNIT_READY command can return | |
1030 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
1031 | * based on the sense information. | |
1032 | */ | |
1033 | case TEST_UNIT_READY: | |
1034 | break; | |
c50bd448 S |
1035 | default: |
1036 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1037 | } | |
1038 | break; | |
1039 | case SRB_STATUS_INVALID_LUN: | |
1040 | do_work = true; | |
1041 | process_err_fn = storvsc_remove_lun; | |
1042 | break; | |
6781209e S |
1043 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
1044 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
1045 | do_work = true; | |
1046 | process_err_fn = storvsc_device_scan; | |
1047 | /* | |
1048 | * Retry the I/O that trigerred this. | |
1049 | */ | |
1050 | set_host_byte(scmnd, DID_REQUEUE); | |
1051 | } | |
1052 | break; | |
c50bd448 | 1053 | } |
6781209e | 1054 | |
c50bd448 S |
1055 | if (!do_work) |
1056 | return; | |
1057 | ||
1058 | /* | |
1059 | * We need to schedule work to process this error; schedule it. | |
1060 | */ | |
1061 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1062 | if (!wrk) { | |
1063 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1064 | return; | |
1065 | } | |
1066 | ||
1067 | wrk->host = host; | |
1068 | wrk->lun = vm_srb->lun; | |
1069 | INIT_WORK(&wrk->work, process_err_fn); | |
1070 | schedule_work(&wrk->work); | |
1071 | } | |
1072 | ||
2707388c | 1073 | |
61eaffc9 | 1074 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 1075 | { |
2707388c S |
1076 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
1077 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
2707388c S |
1078 | struct scsi_sense_hdr sense_hdr; |
1079 | struct vmscsi_request *vm_srb; | |
c50bd448 S |
1080 | struct Scsi_Host *host; |
1081 | struct storvsc_device *stor_dev; | |
1082 | struct hv_device *dev = host_dev->dev; | |
1083 | ||
1084 | stor_dev = get_in_stor_device(dev); | |
1085 | host = stor_dev->host; | |
8dcf37d4 | 1086 | |
61eaffc9 | 1087 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
1088 | if (cmd_request->bounce_sgl_count) { |
1089 | if (vm_srb->data_in == READ_TYPE) | |
1090 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1091 | cmd_request->bounce_sgl, | |
1092 | scsi_sg_count(scmnd), | |
1093 | cmd_request->bounce_sgl_count); | |
1094 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1095 | cmd_request->bounce_sgl_count); | |
1096 | } | |
8dcf37d4 | 1097 | |
42e22cac S |
1098 | scmnd->result = vm_srb->scsi_status; |
1099 | ||
2707388c S |
1100 | if (scmnd->result) { |
1101 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1102 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
d811b848 HR |
1103 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1104 | &sense_hdr); | |
2707388c S |
1105 | } |
1106 | ||
c50bd448 S |
1107 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
1108 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
1109 | sense_hdr.ascq); | |
1110 | ||
2707388c | 1111 | scsi_set_resid(scmnd, |
61eaffc9 | 1112 | cmd_request->data_buffer.len - |
2707388c S |
1113 | vm_srb->data_transfer_length); |
1114 | ||
ead3700d | 1115 | scmnd->scsi_done(scmnd); |
2707388c S |
1116 | } |
1117 | ||
1118 | static void storvsc_on_io_completion(struct hv_device *device, | |
1119 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1120 | struct storvsc_cmd_request *request) |
2707388c S |
1121 | { |
1122 | struct storvsc_device *stor_device; | |
1123 | struct vstor_packet *stor_pkt; | |
1124 | ||
1125 | stor_device = hv_get_drvdata(device); | |
1126 | stor_pkt = &request->vstor_packet; | |
1127 | ||
1128 | /* | |
1129 | * The current SCSI handling on the host side does | |
1130 | * not correctly handle: | |
1131 | * INQUIRY command with page code parameter set to 0x80 | |
1132 | * MODE_SENSE command with cmd[2] == 0x1c | |
1133 | * | |
1134 | * Setup srb and scsi status so this won't be fatal. | |
1135 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1136 | * (srb status == 0x4) and off-line the device in that case. |
1137 | */ | |
1138 | ||
1139 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1140 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1141 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1142 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1143 | } |
1144 | ||
8dcf37d4 S |
1145 | |
1146 | /* Copy over the status...etc */ | |
1147 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1148 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1149 | stor_pkt->vm_srb.sense_info_length = | |
1150 | vstor_packet->vm_srb.sense_info_length; | |
1151 | ||
8dcf37d4 S |
1152 | |
1153 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1154 | /* CHECK_CONDITION */ | |
16046320 S |
1155 | if (vstor_packet->vm_srb.srb_status & |
1156 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1157 | /* autosense data available */ |
8dcf37d4 | 1158 | |
ead3700d | 1159 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1160 | vstor_packet->vm_srb.sense_data, |
1161 | vstor_packet->vm_srb.sense_info_length); | |
1162 | ||
1163 | } | |
1164 | } | |
1165 | ||
1166 | stor_pkt->vm_srb.data_transfer_length = | |
1167 | vstor_packet->vm_srb.data_transfer_length; | |
1168 | ||
2707388c | 1169 | storvsc_command_completion(request); |
8dcf37d4 S |
1170 | |
1171 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1172 | stor_device->drain_notify) | |
1173 | wake_up(&stor_device->waiting_to_drain); | |
1174 | ||
1175 | ||
1176 | } | |
1177 | ||
1178 | static void storvsc_on_receive(struct hv_device *device, | |
1179 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1180 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1181 | { |
12675799 S |
1182 | struct storvsc_scan_work *work; |
1183 | struct storvsc_device *stor_device; | |
1184 | ||
8dcf37d4 S |
1185 | switch (vstor_packet->operation) { |
1186 | case VSTOR_OPERATION_COMPLETE_IO: | |
1187 | storvsc_on_io_completion(device, vstor_packet, request); | |
1188 | break; | |
12675799 | 1189 | |
8dcf37d4 | 1190 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
1191 | case VSTOR_OPERATION_ENUMERATE_BUS: |
1192 | stor_device = get_in_stor_device(device); | |
1193 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1194 | if (!work) | |
1195 | return; | |
1196 | ||
2a09ed3d | 1197 | INIT_WORK(&work->work, storvsc_host_scan); |
12675799 S |
1198 | work->host = stor_device->host; |
1199 | schedule_work(&work->work); | |
1200 | break; | |
8dcf37d4 S |
1201 | |
1202 | default: | |
1203 | break; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | static void storvsc_on_channel_callback(void *context) | |
1208 | { | |
6f94d5de S |
1209 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1210 | struct hv_device *device; | |
8dcf37d4 S |
1211 | struct storvsc_device *stor_device; |
1212 | u32 bytes_recvd; | |
1213 | u64 request_id; | |
1214 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1215 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1216 | int ret; |
1217 | ||
6f94d5de S |
1218 | if (channel->primary_channel != NULL) |
1219 | device = channel->primary_channel->device_obj; | |
1220 | else | |
1221 | device = channel->device_obj; | |
8dcf37d4 S |
1222 | |
1223 | stor_device = get_in_stor_device(device); | |
1224 | if (!stor_device) | |
1225 | return; | |
1226 | ||
1227 | do { | |
6f94d5de | 1228 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1229 | ALIGN((sizeof(struct vstor_packet) - |
1230 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1231 | &bytes_recvd, &request_id); |
1232 | if (ret == 0 && bytes_recvd > 0) { | |
1233 | ||
61eaffc9 | 1234 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1235 | (unsigned long)request_id; |
1236 | ||
1237 | if ((request == &stor_device->init_request) || | |
1238 | (request == &stor_device->reset_request)) { | |
1239 | ||
1240 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1241 | (sizeof(struct vstor_packet) - |
1242 | vmscsi_size_delta)); | |
8dcf37d4 S |
1243 | complete(&request->wait_event); |
1244 | } else { | |
1245 | storvsc_on_receive(device, | |
1246 | (struct vstor_packet *)packet, | |
1247 | request); | |
1248 | } | |
1249 | } else { | |
1250 | break; | |
1251 | } | |
1252 | } while (1); | |
1253 | ||
1254 | return; | |
1255 | } | |
1256 | ||
1257 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1258 | { | |
1259 | struct vmstorage_channel_properties props; | |
1260 | int ret; | |
1261 | ||
1262 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1263 | ||
8dcf37d4 S |
1264 | ret = vmbus_open(device->channel, |
1265 | ring_size, | |
1266 | ring_size, | |
1267 | (void *)&props, | |
1268 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1269 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1270 | |
1271 | if (ret != 0) | |
1272 | return ret; | |
1273 | ||
1274 | ret = storvsc_channel_init(device); | |
1275 | ||
1276 | return ret; | |
1277 | } | |
1278 | ||
c1b3d067 | 1279 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1280 | { |
1281 | struct storvsc_device *stor_device; | |
1282 | unsigned long flags; | |
1283 | ||
cd654ea1 | 1284 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1285 | |
1286 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1287 | stor_device->destroy = true; | |
1288 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1289 | ||
1290 | /* | |
1291 | * At this point, all outbound traffic should be disable. We | |
1292 | * only allow inbound traffic (responses) to proceed so that | |
1293 | * outstanding requests can be completed. | |
1294 | */ | |
1295 | ||
1296 | storvsc_wait_to_drain(stor_device); | |
1297 | ||
1298 | /* | |
1299 | * Since we have already drained, we don't need to busy wait | |
1300 | * as was done in final_release_stor_device() | |
1301 | * Note that we cannot set the ext pointer to NULL until | |
1302 | * we have drained - to drain the outgoing packets, we need to | |
1303 | * allow incoming packets. | |
1304 | */ | |
1305 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1306 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1307 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1308 | ||
1309 | /* Close the channel */ | |
1310 | vmbus_close(device->channel); | |
1311 | ||
1312 | kfree(stor_device); | |
1313 | return 0; | |
1314 | } | |
1315 | ||
c1b3d067 | 1316 | static int storvsc_do_io(struct hv_device *device, |
61eaffc9 | 1317 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1318 | { |
1319 | struct storvsc_device *stor_device; | |
1320 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1321 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 S |
1322 | int ret = 0; |
1323 | ||
1324 | vstor_packet = &request->vstor_packet; | |
1325 | stor_device = get_out_stor_device(device); | |
1326 | ||
1327 | if (!stor_device) | |
1328 | return -ENODEV; | |
1329 | ||
1330 | ||
1331 | request->device = device; | |
6f94d5de S |
1332 | /* |
1333 | * Select an an appropriate channel to send the request out. | |
1334 | */ | |
1335 | ||
1336 | outgoing_channel = vmbus_get_outgoing_channel(device->channel); | |
8dcf37d4 S |
1337 | |
1338 | ||
1339 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1340 | ||
8b612fa2 S |
1341 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1342 | vmscsi_size_delta); | |
8dcf37d4 S |
1343 | |
1344 | ||
8b612fa2 | 1345 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1346 | |
1347 | ||
1348 | vstor_packet->vm_srb.data_transfer_length = | |
1349 | request->data_buffer.len; | |
1350 | ||
1351 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1352 | ||
1353 | if (request->data_buffer.len) { | |
6f94d5de | 1354 | ret = vmbus_sendpacket_multipagebuffer(outgoing_channel, |
8dcf37d4 S |
1355 | &request->data_buffer, |
1356 | vstor_packet, | |
8b612fa2 S |
1357 | (sizeof(struct vstor_packet) - |
1358 | vmscsi_size_delta), | |
8dcf37d4 S |
1359 | (unsigned long)request); |
1360 | } else { | |
1361 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1362 | (sizeof(struct vstor_packet) - |
1363 | vmscsi_size_delta), | |
8dcf37d4 S |
1364 | (unsigned long)request, |
1365 | VM_PKT_DATA_INBAND, | |
1366 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1367 | } | |
1368 | ||
1369 | if (ret != 0) | |
1370 | return ret; | |
1371 | ||
1372 | atomic_inc(&stor_device->num_outstanding_req); | |
1373 | ||
1374 | return ret; | |
1375 | } | |
1376 | ||
419f2d03 S |
1377 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1378 | { | |
db5ed4df | 1379 | scsi_change_queue_depth(sdevice, STORVSC_MAX_IO_REQUESTS); |
419f2d03 | 1380 | |
419f2d03 S |
1381 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1382 | ||
419f2d03 | 1383 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1384 | |
893def38 S |
1385 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1386 | ||
3e8f4f40 OH |
1387 | sdevice->no_write_same = 1; |
1388 | ||
f3cfabce S |
1389 | /* |
1390 | * Add blist flags to permit the reading of the VPD pages even when | |
1391 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1392 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1393 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1394 | */ | |
1395 | sdevice->sdev_bflags |= msft_blist_flags; | |
1396 | ||
b0a93d96 S |
1397 | /* |
1398 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
1399 | * if the device is a MSFT virtual device. | |
1400 | */ | |
1401 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
1402 | switch (vmbus_proto_version) { | |
1403 | case VERSION_WIN8: | |
1404 | case VERSION_WIN8_1: | |
1405 | sdevice->scsi_level = SCSI_SPC_3; | |
1406 | break; | |
1407 | } | |
1408 | } | |
1409 | ||
419f2d03 S |
1410 | return 0; |
1411 | } | |
1412 | ||
62838ce2 S |
1413 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1414 | sector_t capacity, int *info) | |
1415 | { | |
5326fd5c S |
1416 | sector_t nsect = capacity; |
1417 | sector_t cylinders = nsect; | |
1418 | int heads, sectors_pt; | |
62838ce2 | 1419 | |
5326fd5c S |
1420 | /* |
1421 | * We are making up these values; let us keep it simple. | |
1422 | */ | |
1423 | heads = 0xff; | |
1424 | sectors_pt = 0x3f; /* Sectors per track */ | |
1425 | sector_div(cylinders, heads * sectors_pt); | |
1426 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1427 | cylinders = 0xffff; | |
62838ce2 S |
1428 | |
1429 | info[0] = heads; | |
5326fd5c S |
1430 | info[1] = sectors_pt; |
1431 | info[2] = (int)cylinders; | |
62838ce2 | 1432 | |
62838ce2 S |
1433 | return 0; |
1434 | } | |
aa3d789e | 1435 | |
4b270c8b | 1436 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1437 | { |
4b270c8b S |
1438 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1439 | struct hv_device *device = host_dev->dev; | |
1440 | ||
aa3d789e | 1441 | struct storvsc_device *stor_device; |
61eaffc9 | 1442 | struct storvsc_cmd_request *request; |
aa3d789e S |
1443 | struct vstor_packet *vstor_packet; |
1444 | int ret, t; | |
1445 | ||
aa3d789e | 1446 | |
1eaaddf9 | 1447 | stor_device = get_out_stor_device(device); |
aa3d789e | 1448 | if (!stor_device) |
a00e8224 | 1449 | return FAILED; |
aa3d789e S |
1450 | |
1451 | request = &stor_device->reset_request; | |
1452 | vstor_packet = &request->vstor_packet; | |
1453 | ||
1454 | init_completion(&request->wait_event); | |
1455 | ||
1456 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1457 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1458 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1459 | ||
1460 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1461 | (sizeof(struct vstor_packet) - |
1462 | vmscsi_size_delta), | |
aa3d789e S |
1463 | (unsigned long)&stor_device->reset_request, |
1464 | VM_PKT_DATA_INBAND, | |
1465 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1466 | if (ret != 0) | |
a00e8224 | 1467 | return FAILED; |
aa3d789e | 1468 | |
46d2eb6d | 1469 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1470 | if (t == 0) |
1471 | return TIMEOUT_ERROR; | |
aa3d789e | 1472 | |
aa3d789e S |
1473 | |
1474 | /* | |
1475 | * At this point, all outstanding requests in the adapter | |
1476 | * should have been flushed out and return to us | |
5c1b10ab S |
1477 | * There is a potential race here where the host may be in |
1478 | * the process of responding when we return from here. | |
1479 | * Just wait for all in-transit packets to be accounted for | |
1480 | * before we return from here. | |
aa3d789e | 1481 | */ |
5c1b10ab | 1482 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1483 | |
a00e8224 | 1484 | return SUCCESS; |
aa3d789e S |
1485 | } |
1486 | ||
56b26e69 S |
1487 | /* |
1488 | * The host guarantees to respond to each command, although I/O latencies might | |
1489 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1490 | * chance to perform EH. | |
1491 | */ | |
1492 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1493 | { | |
1494 | return BLK_EH_RESET_TIMER; | |
1495 | } | |
1496 | ||
c77b63b6 | 1497 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1498 | { |
1499 | bool allowed = true; | |
1500 | u8 scsi_op = scmnd->cmnd[0]; | |
1501 | ||
1502 | switch (scsi_op) { | |
3e8f4f40 OH |
1503 | /* the host does not handle WRITE_SAME, log accident usage */ |
1504 | case WRITE_SAME: | |
c77b63b6 S |
1505 | /* |
1506 | * smartd sends this command and the host does not handle | |
1507 | * this. So, don't send it. | |
1508 | */ | |
41098f8f | 1509 | case SET_WINDOW: |
59e00e74 | 1510 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1511 | allowed = false; |
1512 | break; | |
1513 | default: | |
1514 | break; | |
92ae4ebd OH |
1515 | } |
1516 | return allowed; | |
1517 | } | |
c5b463ae | 1518 | |
bab445e1 | 1519 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1520 | { |
1521 | int ret; | |
bab445e1 | 1522 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1523 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1524 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1525 | int i; |
1526 | struct scatterlist *sgl; | |
1527 | unsigned int sg_count = 0; | |
1528 | struct vmscsi_request *vm_srb; | |
1529 | ||
8caf92d8 S |
1530 | if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) { |
1531 | /* | |
1532 | * On legacy hosts filter unimplemented commands. | |
1533 | * Future hosts are expected to correctly handle | |
1534 | * unsupported commands. Furthermore, it is | |
1535 | * possible that some of the currently | |
1536 | * unsupported commands maybe supported in | |
1537 | * future versions of the host. | |
1538 | */ | |
1539 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1540 | scmnd->scsi_done(scmnd); | |
1541 | return 0; | |
1542 | } | |
92ae4ebd | 1543 | } |
c5b463ae | 1544 | |
c5b463ae | 1545 | /* Setup the cmd request */ |
c5b463ae S |
1546 | cmd_request->cmd = scmnd; |
1547 | ||
61eaffc9 | 1548 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1549 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1550 | |
f885fb73 S |
1551 | vm_srb->win8_extension.srb_flags |= |
1552 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | | |
1553 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER); | |
c5b463ae S |
1554 | |
1555 | /* Build the SRB */ | |
1556 | switch (scmnd->sc_data_direction) { | |
1557 | case DMA_TO_DEVICE: | |
1558 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1559 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1560 | break; |
1561 | case DMA_FROM_DEVICE: | |
1562 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1563 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae S |
1564 | break; |
1565 | default: | |
1566 | vm_srb->data_in = UNKNOWN_TYPE; | |
f885fb73 S |
1567 | vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN | |
1568 | SRB_FLAGS_DATA_OUT); | |
c5b463ae S |
1569 | break; |
1570 | } | |
1571 | ||
c5b463ae | 1572 | |
c5b463ae S |
1573 | vm_srb->port_number = host_dev->port; |
1574 | vm_srb->path_id = scmnd->device->channel; | |
1575 | vm_srb->target_id = scmnd->device->id; | |
1576 | vm_srb->lun = scmnd->device->lun; | |
1577 | ||
c5b463ae S |
1578 | vm_srb->cdb_length = scmnd->cmd_len; |
1579 | ||
1580 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1581 | ||
61eaffc9 | 1582 | cmd_request->data_buffer.len = scsi_bufflen(scmnd); |
c5b463ae S |
1583 | if (scsi_sg_count(scmnd)) { |
1584 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1585 | sg_count = scsi_sg_count(scmnd); | |
1586 | ||
1587 | /* check if we need to bounce the sgl */ | |
1588 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1589 | cmd_request->bounce_sgl = | |
1590 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1591 | scsi_bufflen(scmnd), |
1592 | vm_srb->data_in); | |
ead3700d CH |
1593 | if (!cmd_request->bounce_sgl) |
1594 | return SCSI_MLQUEUE_HOST_BUSY; | |
c5b463ae S |
1595 | |
1596 | cmd_request->bounce_sgl_count = | |
1597 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1598 | PAGE_SHIFT; | |
1599 | ||
fa23b8c7 S |
1600 | if (vm_srb->data_in == WRITE_TYPE) |
1601 | copy_to_bounce_buffer(sgl, | |
1602 | cmd_request->bounce_sgl, | |
1603 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1604 | |
1605 | sgl = cmd_request->bounce_sgl; | |
1606 | sg_count = cmd_request->bounce_sgl_count; | |
1607 | } | |
1608 | ||
61eaffc9 | 1609 | cmd_request->data_buffer.offset = sgl[0].offset; |
c5b463ae S |
1610 | |
1611 | for (i = 0; i < sg_count; i++) | |
61eaffc9 | 1612 | cmd_request->data_buffer.pfn_array[i] = |
c5b463ae S |
1613 | page_to_pfn(sg_page((&sgl[i]))); |
1614 | ||
1615 | } else if (scsi_sglist(scmnd)) { | |
61eaffc9 | 1616 | cmd_request->data_buffer.offset = |
c5b463ae | 1617 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
61eaffc9 | 1618 | cmd_request->data_buffer.pfn_array[0] = |
c5b463ae S |
1619 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1620 | } | |
1621 | ||
c5b463ae | 1622 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1623 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1624 | |
d2598f01 | 1625 | if (ret == -EAGAIN) { |
c5b463ae S |
1626 | /* no more space */ |
1627 | ||
e86fb5e8 | 1628 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1629 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1630 | cmd_request->bounce_sgl_count); |
c5b463ae | 1631 | |
ead3700d | 1632 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1633 | } |
1634 | ||
c77b63b6 | 1635 | return 0; |
c5b463ae S |
1636 | } |
1637 | ||
bef4a34a | 1638 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1639 | .module = THIS_MODULE, |
1640 | .name = "storvsc_host_t", | |
ead3700d | 1641 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1642 | .bios_param = storvsc_get_chs, |
1643 | .queuecommand = storvsc_queuecommand, | |
1644 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1645 | .proc_name = "storvsc_host", |
56b26e69 | 1646 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1647 | .slave_configure = storvsc_device_configure, |
52f9614d | 1648 | .cmd_per_lun = 255, |
0686e4f4 | 1649 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1650 | .this_id = -1, |
454f18a9 | 1651 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1652 | /* currently 32 */ |
1653 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1654 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1655 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1656 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1657 | .no_write_same = 1, |
bef4a34a HJ |
1658 | }; |
1659 | ||
ef52a81b S |
1660 | enum { |
1661 | SCSI_GUID, | |
1662 | IDE_GUID, | |
bde6d0f9 | 1663 | SFC_GUID, |
ef52a81b S |
1664 | }; |
1665 | ||
d847b5fe | 1666 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1667 | /* SCSI guid */ |
35c3bc20 S |
1668 | { HV_SCSI_GUID, |
1669 | .driver_data = SCSI_GUID | |
1670 | }, | |
21e37742 | 1671 | /* IDE guid */ |
35c3bc20 S |
1672 | { HV_IDE_GUID, |
1673 | .driver_data = IDE_GUID | |
1674 | }, | |
bde6d0f9 S |
1675 | /* Fibre Channel GUID */ |
1676 | { | |
1677 | HV_SYNTHFC_GUID, | |
1678 | .driver_data = SFC_GUID | |
1679 | }, | |
c45cf2d4 | 1680 | { }, |
d847b5fe | 1681 | }; |
bef4a34a | 1682 | |
d847b5fe | 1683 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1684 | |
84946899 S |
1685 | static int storvsc_probe(struct hv_device *device, |
1686 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1687 | { |
ff568d3a | 1688 | int ret; |
bef4a34a | 1689 | struct Scsi_Host *host; |
795b613d | 1690 | struct hv_host_device *host_dev; |
ef52a81b | 1691 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1692 | int target = 0; |
6e4198ce | 1693 | struct storvsc_device *stor_device; |
0fb8db29 S |
1694 | int max_luns_per_target; |
1695 | int max_targets; | |
1696 | int max_channels; | |
bd1f5d6a | 1697 | |
8b612fa2 S |
1698 | /* |
1699 | * Based on the windows host we are running on, | |
1700 | * set state to properly communicate with the host. | |
1701 | */ | |
1702 | ||
adb6f9e1 S |
1703 | switch (vmbus_proto_version) { |
1704 | case VERSION_WS2008: | |
1705 | case VERSION_WIN7: | |
8b612fa2 S |
1706 | sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
1707 | vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
1708 | vmstor_current_major = VMSTOR_WIN7_MAJOR; | |
1709 | vmstor_current_minor = VMSTOR_WIN7_MINOR; | |
0fb8db29 S |
1710 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1711 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1712 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
adb6f9e1 S |
1713 | break; |
1714 | default: | |
1715 | sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE; | |
1716 | vmscsi_size_delta = 0; | |
1717 | vmstor_current_major = VMSTOR_WIN8_MAJOR; | |
1718 | vmstor_current_minor = VMSTOR_WIN8_MINOR; | |
0fb8db29 S |
1719 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1720 | max_targets = STORVSC_MAX_TARGETS; | |
1721 | max_channels = STORVSC_MAX_CHANNELS; | |
adb6f9e1 | 1722 | break; |
8b612fa2 S |
1723 | } |
1724 | ||
4cd83ecd S |
1725 | if (dev_id->driver_data == SFC_GUID) |
1726 | scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS * | |
1727 | STORVSC_FC_MAX_TARGETS); | |
ff568d3a | 1728 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1729 | sizeof(struct hv_host_device)); |
f8feed06 | 1730 | if (!host) |
bef4a34a | 1731 | return -ENOMEM; |
bef4a34a | 1732 | |
7f33f30a | 1733 | host_dev = shost_priv(host); |
795b613d | 1734 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1735 | |
795b613d | 1736 | host_dev->port = host->host_no; |
97c15296 | 1737 | host_dev->dev = device; |
bef4a34a | 1738 | |
4e03e697 | 1739 | |
a13d35ab | 1740 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1741 | if (!stor_device) { |
225ce6ea | 1742 | ret = -ENOMEM; |
ce3e301c | 1743 | goto err_out0; |
6e4198ce | 1744 | } |
9efd21e1 | 1745 | |
a13d35ab | 1746 | stor_device->destroy = false; |
6f94d5de | 1747 | stor_device->open_sub_channel = false; |
a13d35ab S |
1748 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1749 | stor_device->device = device; | |
cd654ea1 S |
1750 | stor_device->host = host; |
1751 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1752 | |
6e4198ce S |
1753 | stor_device->port_number = host->host_no; |
1754 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1755 | if (ret) |
ce3e301c | 1756 | goto err_out1; |
bef4a34a | 1757 | |
6e4198ce S |
1758 | host_dev->path = stor_device->path_id; |
1759 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1760 | |
4cd83ecd S |
1761 | switch (dev_id->driver_data) { |
1762 | case SFC_GUID: | |
1763 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1764 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1765 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
1766 | break; | |
1767 | ||
1768 | case SCSI_GUID: | |
0fb8db29 S |
1769 | host->max_lun = max_luns_per_target; |
1770 | host->max_id = max_targets; | |
1771 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1772 | break; |
1773 | ||
1774 | default: | |
1775 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1776 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1777 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1778 | break; | |
1779 | } | |
cf55f4a8 MS |
1780 | /* max cmd length */ |
1781 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1782 | |
454f18a9 | 1783 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1784 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1785 | if (ret != 0) |
ce3e301c | 1786 | goto err_out2; |
bef4a34a | 1787 | |
bd1f5d6a S |
1788 | if (!dev_is_ide) { |
1789 | scsi_scan_host(host); | |
59d22950 S |
1790 | } else { |
1791 | target = (device->dev_instance.b[5] << 8 | | |
1792 | device->dev_instance.b[4]); | |
1793 | ret = scsi_add_device(host, 0, target, 0); | |
1794 | if (ret) { | |
1795 | scsi_remove_host(host); | |
1796 | goto err_out2; | |
1797 | } | |
bef4a34a | 1798 | } |
bd1f5d6a | 1799 | return 0; |
bef4a34a | 1800 | |
ce3e301c | 1801 | err_out2: |
225ce6ea S |
1802 | /* |
1803 | * Once we have connected with the host, we would need to | |
1804 | * to invoke storvsc_dev_remove() to rollback this state and | |
1805 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1806 | * err_out1 label. |
225ce6ea | 1807 | */ |
bd1f5d6a | 1808 | storvsc_dev_remove(device); |
ce3e301c | 1809 | goto err_out0; |
225ce6ea S |
1810 | |
1811 | err_out1: | |
ce3e301c | 1812 | kfree(stor_device); |
225ce6ea S |
1813 | |
1814 | err_out0: | |
bd1f5d6a | 1815 | scsi_host_put(host); |
225ce6ea | 1816 | return ret; |
bef4a34a HJ |
1817 | } |
1818 | ||
ddcbf65e S |
1819 | static int storvsc_remove(struct hv_device *dev) |
1820 | { | |
1821 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1822 | struct Scsi_Host *host = stor_device->host; | |
1823 | ||
1824 | scsi_remove_host(host); | |
1825 | storvsc_dev_remove(dev); | |
1826 | scsi_host_put(host); | |
1827 | ||
1828 | return 0; | |
1829 | } | |
1830 | ||
40bf63ed | 1831 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1832 | .name = KBUILD_MODNAME, |
d847b5fe | 1833 | .id_table = id_table, |
40bf63ed S |
1834 | .probe = storvsc_probe, |
1835 | .remove = storvsc_remove, | |
39ae6fae | 1836 | }; |
7bd05b91 | 1837 | |
d9bbae83 | 1838 | static int __init storvsc_drv_init(void) |
f5c78872 | 1839 | { |
01415ab3 S |
1840 | u32 max_outstanding_req_per_channel; |
1841 | ||
1842 | /* | |
1843 | * Divide the ring buffer data size (which is 1 page less | |
1844 | * than the ring buffer size since that page is reserved for | |
1845 | * the ring buffer indices) by the max request size (which is | |
1846 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1847 | */ | |
01415ab3 | 1848 | max_outstanding_req_per_channel = |
768fa219 GKH |
1849 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1850 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1851 | sizeof(struct vstor_packet) + sizeof(u64) - |
1852 | vmscsi_size_delta, | |
768fa219 | 1853 | sizeof(u64))); |
f5c78872 | 1854 | |
01415ab3 | 1855 | if (max_outstanding_req_per_channel < |
f5c78872 | 1856 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1857 | return -EINVAL; |
f5c78872 | 1858 | |
768fa219 | 1859 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1860 | } |
1861 | ||
c63ba9e1 | 1862 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1863 | { |
768fa219 | 1864 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1865 | } |
1866 | ||
ff568d3a | 1867 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1868 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1869 | module_init(storvsc_drv_init); |
c63ba9e1 | 1870 | module_exit(storvsc_drv_exit); |