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 |
1a363108 KM |
59 | * Win8.1: 6.0 |
60 | * Win10: 6.2 | |
09f0355f S |
61 | */ |
62 | ||
2492fd7a KM |
63 | #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
64 | (((MINOR_) & 0xff))) | |
8b612fa2 | 65 | |
1a363108 | 66 | #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
2492fd7a KM |
67 | #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
68 | #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) | |
1a363108 KM |
69 | #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
70 | #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) | |
f0d79fe9 | 71 | |
f0d79fe9 S |
72 | /* Packet structure describing virtual storage requests. */ |
73 | enum vstor_packet_operation { | |
74 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
75 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
76 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
77 | VSTOR_OPERATION_RESET_LUN = 4, | |
78 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
79 | VSTOR_OPERATION_RESET_BUS = 6, | |
80 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
81 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
82 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
83 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 84 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
85 | VSTOR_OPERATION_FCHBA_DATA = 12, |
86 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
87 | VSTOR_OPERATION_MAXIMUM = 13 | |
88 | }; | |
89 | ||
90 | /* | |
91 | * WWN packet for Fibre Channel HBA | |
92 | */ | |
93 | ||
94 | struct hv_fc_wwn_packet { | |
95 | bool primary_active; | |
96 | u8 reserved1; | |
97 | u8 reserved2; | |
98 | u8 primary_port_wwn[8]; | |
99 | u8 primary_node_wwn[8]; | |
100 | u8 secondary_port_wwn[8]; | |
101 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
102 | }; |
103 | ||
8b612fa2 S |
104 | |
105 | ||
106 | /* | |
107 | * SRB Flag Bits | |
108 | */ | |
109 | ||
110 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
111 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
112 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
113 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
114 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
115 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
116 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
117 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
118 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
119 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
120 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
121 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
122 | ||
123 | /* | |
124 | * This flag indicates the request is part of the workflow for processing a D3. | |
125 | */ | |
126 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
127 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
128 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
129 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
130 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
131 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
132 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
133 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
134 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
135 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
136 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
137 | ||
138 | ||
f0d79fe9 S |
139 | /* |
140 | * Platform neutral description of a scsi request - | |
141 | * this remains the same across the write regardless of 32/64 bit | |
142 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
143 | */ | |
6b2f9495 | 144 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
145 | |
146 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
147 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
148 | ||
149 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 150 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 151 | |
8b612fa2 S |
152 | /* |
153 | * Sense buffer size changed in win8; have a run-time | |
cb11fead KM |
154 | * variable to track the size we should use. This value will |
155 | * likely change during protocol negotiation but it is valid | |
156 | * to start by assuming pre-Win8. | |
8b612fa2 | 157 | */ |
cb11fead | 158 | static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
8b612fa2 S |
159 | |
160 | /* | |
cb11fead KM |
161 | * The storage protocol version is determined during the |
162 | * initial exchange with the host. It will indicate which | |
163 | * storage functionality is available in the host. | |
164 | */ | |
2492fd7a | 165 | static int vmstor_proto_version; |
8b612fa2 S |
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 | ||
cb11fead KM |
209 | /* |
210 | * The size of the vmscsi_request has changed in win8. The | |
211 | * additional size is because of new elements added to the | |
212 | * structure. These elements are valid only when we are talking | |
213 | * to a win8 host. | |
214 | * Track the correction to size we need to apply. This value | |
215 | * will likely change during protocol negotiation but it is | |
216 | * valid to start by assuming pre-Win8. | |
217 | */ | |
218 | static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
219 | ||
1a363108 KM |
220 | /* |
221 | * The list of storage protocols in order of preference. | |
222 | */ | |
223 | struct vmstor_protocol { | |
224 | int protocol_version; | |
225 | int sense_buffer_size; | |
226 | int vmscsi_size_delta; | |
227 | }; | |
228 | ||
229 | ||
230 | static const struct vmstor_protocol vmstor_protocols[] = { | |
231 | { | |
232 | VMSTOR_PROTO_VERSION_WIN10, | |
233 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
234 | 0 | |
235 | }, | |
236 | { | |
237 | VMSTOR_PROTO_VERSION_WIN8_1, | |
238 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
239 | 0 | |
240 | }, | |
241 | { | |
242 | VMSTOR_PROTO_VERSION_WIN8, | |
243 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
244 | 0 | |
245 | }, | |
246 | { | |
247 | VMSTOR_PROTO_VERSION_WIN7, | |
248 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
249 | sizeof(struct vmscsi_win8_extension), | |
250 | }, | |
251 | { | |
252 | VMSTOR_PROTO_VERSION_WIN6, | |
253 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
254 | sizeof(struct vmscsi_win8_extension), | |
255 | } | |
256 | }; | |
257 | ||
258 | ||
f0d79fe9 S |
259 | /* |
260 | * This structure is sent during the intialization phase to get the different | |
261 | * properties of the channel. | |
262 | */ | |
8b612fa2 S |
263 | |
264 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
265 | ||
f0d79fe9 | 266 | struct vmstorage_channel_properties { |
8b612fa2 S |
267 | u32 reserved; |
268 | u16 max_channel_cnt; | |
269 | u16 reserved1; | |
f0d79fe9 | 270 | |
8b612fa2 | 271 | u32 flags; |
c649114a | 272 | u32 max_transfer_bytes; |
f0d79fe9 | 273 | |
8b612fa2 | 274 | u64 reserved2; |
f0d79fe9 S |
275 | } __packed; |
276 | ||
277 | /* This structure is sent during the storage protocol negotiations. */ | |
278 | struct vmstorage_protocol_version { | |
279 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 280 | u16 major_minor; |
f0d79fe9 S |
281 | |
282 | /* | |
283 | * Revision number is auto-incremented whenever this file is changed | |
284 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
285 | * definitely indicate incompatibility--but it does indicate mismatched | |
286 | * builds. | |
c649114a | 287 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 288 | */ |
85904a5e | 289 | u16 revision; |
f0d79fe9 S |
290 | } __packed; |
291 | ||
292 | /* Channel Property Flags */ | |
293 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
294 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
295 | ||
296 | struct vstor_packet { | |
297 | /* Requested operation type */ | |
298 | enum vstor_packet_operation operation; | |
299 | ||
300 | /* Flags - see below for values */ | |
c649114a | 301 | u32 flags; |
f0d79fe9 S |
302 | |
303 | /* Status of the request returned from the server side. */ | |
c649114a | 304 | u32 status; |
f0d79fe9 S |
305 | |
306 | /* Data payload area */ | |
307 | union { | |
308 | /* | |
309 | * Structure used to forward SCSI commands from the | |
310 | * client to the server. | |
311 | */ | |
312 | struct vmscsi_request vm_srb; | |
313 | ||
314 | /* Structure used to query channel properties. */ | |
315 | struct vmstorage_channel_properties storage_channel_properties; | |
316 | ||
317 | /* Used during version negotiations. */ | |
318 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
319 | |
320 | /* Fibre channel address packet */ | |
321 | struct hv_fc_wwn_packet wwn_packet; | |
322 | ||
323 | /* Number of sub-channels to create */ | |
324 | u16 sub_channel_count; | |
325 | ||
326 | /* This will be the maximum of the union members */ | |
327 | u8 buffer[0x34]; | |
f0d79fe9 S |
328 | }; |
329 | } __packed; | |
330 | ||
f0d79fe9 | 331 | /* |
09f0355f S |
332 | * Packet Flags: |
333 | * | |
f0d79fe9 S |
334 | * This flag indicates that the server should send back a completion for this |
335 | * packet. | |
336 | */ | |
09f0355f | 337 | |
f0d79fe9 S |
338 | #define REQUEST_COMPLETION_FLAG 0x1 |
339 | ||
f0d79fe9 S |
340 | /* Matches Windows-end */ |
341 | enum storvsc_request_type { | |
c649114a | 342 | WRITE_TYPE = 0, |
f0d79fe9 S |
343 | READ_TYPE, |
344 | UNKNOWN_TYPE, | |
345 | }; | |
346 | ||
16046320 S |
347 | /* |
348 | * SRB status codes and masks; a subset of the codes used here. | |
349 | */ | |
350 | ||
351 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
3209f9d7 | 352 | #define SRB_STATUS_QUEUE_FROZEN 0x40 |
16046320 S |
353 | #define SRB_STATUS_INVALID_LUN 0x20 |
354 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 355 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
356 | #define SRB_STATUS_ERROR 0x04 |
357 | ||
3209f9d7 S |
358 | #define SRB_STATUS(status) \ |
359 | (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) | |
af9584b8 S |
360 | /* |
361 | * This is the end of Protocol specific defines. | |
362 | */ | |
363 | ||
b9ec3a55 | 364 | static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
f458aada S |
365 | static u32 max_outstanding_req_per_channel; |
366 | ||
367 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
368 | |
369 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
370 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
371 | ||
f458aada S |
372 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
373 | MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); | |
893def38 S |
374 | /* |
375 | * Timeout in seconds for all devices managed by this driver. | |
376 | */ | |
377 | static int storvsc_timeout = 180; | |
378 | ||
f3cfabce S |
379 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
380 | ||
af9584b8 | 381 | |
6f94d5de S |
382 | static void storvsc_on_channel_callback(void *context); |
383 | ||
4cd83ecd S |
384 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
385 | #define STORVSC_MAX_TARGETS 2 | |
386 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 387 | |
4cd83ecd S |
388 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
389 | #define STORVSC_FC_MAX_TARGETS 128 | |
390 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 391 | |
4cd83ecd S |
392 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
393 | #define STORVSC_IDE_MAX_TARGETS 1 | |
394 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 395 | |
61eaffc9 | 396 | struct storvsc_cmd_request { |
61eaffc9 S |
397 | struct scsi_cmnd *cmd; |
398 | ||
f0d79fe9 S |
399 | struct hv_device *device; |
400 | ||
401 | /* Synchronize the request/response if needed */ | |
402 | struct completion wait_event; | |
403 | ||
be0cf6ca S |
404 | struct vmbus_channel_packet_multipage_buffer mpb; |
405 | struct vmbus_packet_mpb_array *payload; | |
406 | u32 payload_sz; | |
407 | ||
f0d79fe9 S |
408 | struct vstor_packet vstor_packet; |
409 | }; | |
410 | ||
411 | ||
f0d79fe9 S |
412 | /* A storvsc device is a device object that contains a vmbus channel */ |
413 | struct storvsc_device { | |
414 | struct hv_device *device; | |
415 | ||
416 | bool destroy; | |
417 | bool drain_notify; | |
6f94d5de | 418 | bool open_sub_channel; |
f0d79fe9 | 419 | atomic_t num_outstanding_req; |
cd654ea1 | 420 | struct Scsi_Host *host; |
f0d79fe9 S |
421 | |
422 | wait_queue_head_t waiting_to_drain; | |
423 | ||
424 | /* | |
425 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
426 | * controller. In reality, the pathid, targetid is always 0 | |
427 | * and the port is set by us | |
428 | */ | |
429 | unsigned int port_number; | |
430 | unsigned char path_id; | |
431 | unsigned char target_id; | |
432 | ||
5117b936 S |
433 | /* |
434 | * Max I/O, the device can support. | |
435 | */ | |
436 | u32 max_transfer_bytes; | |
f0d79fe9 | 437 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
438 | struct storvsc_cmd_request init_request; |
439 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
440 | }; |
441 | ||
ce3e301c S |
442 | struct hv_host_device { |
443 | struct hv_device *dev; | |
c1b3d067 S |
444 | unsigned int port; |
445 | unsigned char path; | |
446 | unsigned char target; | |
447 | }; | |
448 | ||
12675799 S |
449 | struct storvsc_scan_work { |
450 | struct work_struct work; | |
451 | struct Scsi_Host *host; | |
452 | uint lun; | |
453 | }; | |
454 | ||
6781209e S |
455 | static void storvsc_device_scan(struct work_struct *work) |
456 | { | |
457 | struct storvsc_scan_work *wrk; | |
458 | uint lun; | |
459 | struct scsi_device *sdev; | |
460 | ||
461 | wrk = container_of(work, struct storvsc_scan_work, work); | |
462 | lun = wrk->lun; | |
463 | ||
464 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
465 | if (!sdev) | |
466 | goto done; | |
467 | scsi_rescan_device(&sdev->sdev_gendev); | |
468 | scsi_device_put(sdev); | |
469 | ||
470 | done: | |
471 | kfree(wrk); | |
472 | } | |
473 | ||
2a09ed3d | 474 | static void storvsc_host_scan(struct work_struct *work) |
12675799 S |
475 | { |
476 | struct storvsc_scan_work *wrk; | |
2a09ed3d | 477 | struct Scsi_Host *host; |
34a716bc | 478 | struct scsi_device *sdev; |
12675799 S |
479 | |
480 | wrk = container_of(work, struct storvsc_scan_work, work); | |
2a09ed3d S |
481 | host = wrk->host; |
482 | ||
34a716bc S |
483 | /* |
484 | * Before scanning the host, first check to see if any of the | |
485 | * currrently known devices have been hot removed. We issue a | |
486 | * "unit ready" command against all currently known devices. | |
487 | * This I/O will result in an error for devices that have been | |
488 | * removed. As part of handling the I/O error, we remove the device. | |
489 | * | |
490 | * When a LUN is added or removed, the host sends us a signal to | |
491 | * scan the host. Thus we are forced to discover the LUNs that | |
492 | * may have been removed this way. | |
493 | */ | |
494 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 495 | shost_for_each_device(sdev, host) |
34a716bc | 496 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
497 | mutex_unlock(&host->scan_mutex); |
498 | /* | |
499 | * Now scan the host to discover LUNs that may have been added. | |
500 | */ | |
2a09ed3d S |
501 | scsi_scan_host(host); |
502 | ||
12675799 S |
503 | kfree(wrk); |
504 | } | |
505 | ||
b4017319 S |
506 | static void storvsc_remove_lun(struct work_struct *work) |
507 | { | |
508 | struct storvsc_scan_work *wrk; | |
509 | struct scsi_device *sdev; | |
510 | ||
511 | wrk = container_of(work, struct storvsc_scan_work, work); | |
512 | if (!scsi_host_get(wrk->host)) | |
513 | goto done; | |
514 | ||
515 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
516 | ||
517 | if (sdev) { | |
518 | scsi_remove_device(sdev); | |
519 | scsi_device_put(sdev); | |
520 | } | |
521 | scsi_host_put(wrk->host); | |
522 | ||
523 | done: | |
524 | kfree(wrk); | |
525 | } | |
526 | ||
af9584b8 | 527 | |
a8c18c57 S |
528 | /* |
529 | * We can get incoming messages from the host that are not in response to | |
530 | * messages that we have sent out. An example of this would be messages | |
531 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
532 | * deal with potential race conditions where the driver may be in the | |
533 | * midst of being unloaded when we might receive an unsolicited message | |
534 | * from the host, we have implemented a mechanism to gurantee sequential | |
535 | * consistency: | |
536 | * | |
537 | * 1) Once the device is marked as being destroyed, we will fail all | |
538 | * outgoing messages. | |
539 | * 2) We permit incoming messages when the device is being destroyed, | |
540 | * only to properly account for messages already sent out. | |
541 | */ | |
542 | ||
f0d79fe9 S |
543 | static inline struct storvsc_device *get_out_stor_device( |
544 | struct hv_device *device) | |
545 | { | |
546 | struct storvsc_device *stor_device; | |
547 | ||
cd654ea1 | 548 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
549 | |
550 | if (stor_device && stor_device->destroy) | |
551 | stor_device = NULL; | |
552 | ||
553 | return stor_device; | |
554 | } | |
555 | ||
556 | ||
557 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
558 | { | |
559 | dev->drain_notify = true; | |
560 | wait_event(dev->waiting_to_drain, | |
561 | atomic_read(&dev->num_outstanding_req) == 0); | |
562 | dev->drain_notify = false; | |
563 | } | |
bef4a34a | 564 | |
8dcf37d4 S |
565 | static inline struct storvsc_device *get_in_stor_device( |
566 | struct hv_device *device) | |
567 | { | |
568 | struct storvsc_device *stor_device; | |
8dcf37d4 | 569 | |
cd654ea1 | 570 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
571 | |
572 | if (!stor_device) | |
573 | goto get_in_err; | |
574 | ||
575 | /* | |
576 | * If the device is being destroyed; allow incoming | |
577 | * traffic only to cleanup outstanding requests. | |
578 | */ | |
579 | ||
580 | if (stor_device->destroy && | |
581 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
582 | stor_device = NULL; | |
583 | ||
584 | get_in_err: | |
8dcf37d4 S |
585 | return stor_device; |
586 | ||
587 | } | |
588 | ||
6f94d5de S |
589 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
590 | { | |
591 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
592 | struct storvsc_device *stor_device; | |
593 | struct vmstorage_channel_properties props; | |
594 | ||
595 | stor_device = get_out_stor_device(device); | |
596 | if (!stor_device) | |
597 | return; | |
598 | ||
599 | if (stor_device->open_sub_channel == false) | |
600 | return; | |
601 | ||
602 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
603 | ||
604 | vmbus_open(new_sc, | |
605 | storvsc_ringbuffer_size, | |
606 | storvsc_ringbuffer_size, | |
607 | (void *)&props, | |
608 | sizeof(struct vmstorage_channel_properties), | |
609 | storvsc_on_channel_callback, new_sc); | |
610 | } | |
611 | ||
612 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
613 | { | |
614 | struct storvsc_device *stor_device; | |
615 | int num_cpus = num_online_cpus(); | |
616 | int num_sc; | |
617 | struct storvsc_cmd_request *request; | |
618 | struct vstor_packet *vstor_packet; | |
619 | int ret, t; | |
620 | ||
621 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
622 | stor_device = get_out_stor_device(device); | |
623 | if (!stor_device) | |
624 | return; | |
625 | ||
626 | request = &stor_device->init_request; | |
627 | vstor_packet = &request->vstor_packet; | |
628 | ||
629 | stor_device->open_sub_channel = true; | |
630 | /* | |
631 | * Establish a handler for dealing with subchannels. | |
632 | */ | |
633 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
634 | ||
635 | /* | |
636 | * Check to see if sub-channels have already been created. This | |
637 | * can happen when this driver is re-loaded after unloading. | |
638 | */ | |
639 | ||
640 | if (vmbus_are_subchannels_present(device->channel)) | |
641 | return; | |
642 | ||
643 | stor_device->open_sub_channel = false; | |
644 | /* | |
645 | * Request the host to create sub-channels. | |
646 | */ | |
647 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
648 | init_completion(&request->wait_event); | |
649 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
650 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
651 | vstor_packet->sub_channel_count = num_sc; | |
652 | ||
653 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
654 | (sizeof(struct vstor_packet) - | |
655 | vmscsi_size_delta), | |
656 | (unsigned long)request, | |
657 | VM_PKT_DATA_INBAND, | |
658 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
659 | ||
660 | if (ret != 0) | |
661 | return; | |
662 | ||
663 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
664 | if (t == 0) | |
665 | return; | |
666 | ||
667 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
668 | vstor_packet->status != 0) | |
669 | return; | |
670 | ||
671 | /* | |
672 | * Now that we created the sub-channels, invoke the check; this | |
673 | * may trigger the callback. | |
674 | */ | |
675 | stor_device->open_sub_channel = true; | |
676 | vmbus_are_subchannels_present(device->channel); | |
677 | } | |
678 | ||
8dcf37d4 S |
679 | static int storvsc_channel_init(struct hv_device *device) |
680 | { | |
681 | struct storvsc_device *stor_device; | |
61eaffc9 | 682 | struct storvsc_cmd_request *request; |
8dcf37d4 | 683 | struct vstor_packet *vstor_packet; |
1a363108 | 684 | int ret, t, i; |
6f94d5de S |
685 | int max_chns; |
686 | bool process_sub_channels = false; | |
8dcf37d4 S |
687 | |
688 | stor_device = get_out_stor_device(device); | |
689 | if (!stor_device) | |
690 | return -ENODEV; | |
691 | ||
692 | request = &stor_device->init_request; | |
693 | vstor_packet = &request->vstor_packet; | |
694 | ||
695 | /* | |
696 | * Now, initiate the vsc/vsp initialization protocol on the open | |
697 | * channel | |
698 | */ | |
61eaffc9 | 699 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
700 | init_completion(&request->wait_event); |
701 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
702 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
703 | ||
704 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
705 | (sizeof(struct vstor_packet) - |
706 | vmscsi_size_delta), | |
8dcf37d4 S |
707 | (unsigned long)request, |
708 | VM_PKT_DATA_INBAND, | |
709 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
710 | if (ret != 0) | |
711 | goto cleanup; | |
712 | ||
713 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
714 | if (t == 0) { | |
715 | ret = -ETIMEDOUT; | |
716 | goto cleanup; | |
717 | } | |
718 | ||
719 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
111f2d15 S |
720 | vstor_packet->status != 0) { |
721 | ret = -EINVAL; | |
8dcf37d4 | 722 | goto cleanup; |
111f2d15 | 723 | } |
8dcf37d4 S |
724 | |
725 | ||
1a363108 KM |
726 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
727 | /* reuse the packet for version range supported */ | |
728 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
729 | vstor_packet->operation = | |
730 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
731 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 | 732 | |
1a363108 KM |
733 | vstor_packet->version.major_minor = |
734 | vmstor_protocols[i].protocol_version; | |
85904a5e | 735 | |
1a363108 KM |
736 | /* |
737 | * The revision number is only used in Windows; set it to 0. | |
738 | */ | |
739 | vstor_packet->version.revision = 0; | |
8dcf37d4 | 740 | |
1a363108 | 741 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
8b612fa2 S |
742 | (sizeof(struct vstor_packet) - |
743 | vmscsi_size_delta), | |
8dcf37d4 S |
744 | (unsigned long)request, |
745 | VM_PKT_DATA_INBAND, | |
746 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1a363108 KM |
747 | if (ret != 0) |
748 | goto cleanup; | |
8dcf37d4 | 749 | |
1a363108 KM |
750 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
751 | if (t == 0) { | |
752 | ret = -ETIMEDOUT; | |
753 | goto cleanup; | |
754 | } | |
755 | ||
756 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) { | |
757 | ret = -EINVAL; | |
758 | goto cleanup; | |
759 | } | |
760 | ||
761 | if (vstor_packet->status == 0) { | |
762 | vmstor_proto_version = | |
763 | vmstor_protocols[i].protocol_version; | |
764 | ||
765 | sense_buffer_size = | |
766 | vmstor_protocols[i].sense_buffer_size; | |
767 | ||
768 | vmscsi_size_delta = | |
769 | vmstor_protocols[i].vmscsi_size_delta; | |
770 | ||
771 | break; | |
772 | } | |
8dcf37d4 S |
773 | } |
774 | ||
1a363108 KM |
775 | if (vstor_packet->status != 0) { |
776 | ret = -EINVAL; | |
8dcf37d4 | 777 | goto cleanup; |
1a363108 | 778 | } |
8dcf37d4 S |
779 | |
780 | ||
781 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
782 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
783 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 S |
784 | |
785 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
786 | (sizeof(struct vstor_packet) - |
787 | vmscsi_size_delta), | |
8dcf37d4 S |
788 | (unsigned long)request, |
789 | VM_PKT_DATA_INBAND, | |
790 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
791 | ||
792 | if (ret != 0) | |
793 | goto cleanup; | |
794 | ||
795 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
796 | if (t == 0) { | |
797 | ret = -ETIMEDOUT; | |
798 | goto cleanup; | |
799 | } | |
800 | ||
801 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
111f2d15 S |
802 | vstor_packet->status != 0) { |
803 | ret = -EINVAL; | |
8dcf37d4 | 804 | goto cleanup; |
111f2d15 | 805 | } |
8dcf37d4 | 806 | |
6f94d5de S |
807 | /* |
808 | * Check to see if multi-channel support is there. | |
809 | * Hosts that implement protocol version of 5.1 and above | |
810 | * support multi-channel. | |
811 | */ | |
812 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
e6c4bc66 | 813 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
6f94d5de S |
814 | if (vstor_packet->storage_channel_properties.flags & |
815 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
816 | process_sub_channels = true; | |
817 | } | |
5117b936 S |
818 | stor_device->max_transfer_bytes = |
819 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 820 | |
8dcf37d4 S |
821 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
822 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
823 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
824 | ||
825 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
826 | (sizeof(struct vstor_packet) - |
827 | vmscsi_size_delta), | |
8dcf37d4 S |
828 | (unsigned long)request, |
829 | VM_PKT_DATA_INBAND, | |
830 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
831 | ||
832 | if (ret != 0) | |
833 | goto cleanup; | |
834 | ||
835 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
836 | if (t == 0) { | |
837 | ret = -ETIMEDOUT; | |
838 | goto cleanup; | |
839 | } | |
840 | ||
841 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
111f2d15 S |
842 | vstor_packet->status != 0) { |
843 | ret = -EINVAL; | |
8dcf37d4 | 844 | goto cleanup; |
111f2d15 | 845 | } |
8dcf37d4 | 846 | |
6f94d5de S |
847 | if (process_sub_channels) |
848 | handle_multichannel_storage(device, max_chns); | |
849 | ||
8dcf37d4 S |
850 | |
851 | cleanup: | |
852 | return ret; | |
853 | } | |
854 | ||
c50bd448 S |
855 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
856 | struct scsi_cmnd *scmnd, | |
857 | struct Scsi_Host *host, | |
858 | u8 asc, u8 ascq) | |
859 | { | |
860 | struct storvsc_scan_work *wrk; | |
861 | void (*process_err_fn)(struct work_struct *work); | |
862 | bool do_work = false; | |
863 | ||
3209f9d7 | 864 | switch (SRB_STATUS(vm_srb->srb_status)) { |
c50bd448 S |
865 | case SRB_STATUS_ERROR: |
866 | /* | |
867 | * If there is an error; offline the device since all | |
868 | * error recovery strategies would have already been | |
869 | * deployed on the host side. However, if the command | |
870 | * were a pass-through command deal with it appropriately. | |
871 | */ | |
872 | switch (scmnd->cmnd[0]) { | |
873 | case ATA_16: | |
874 | case ATA_12: | |
875 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
876 | break; | |
3533f860 S |
877 | /* |
878 | * On Some Windows hosts TEST_UNIT_READY command can return | |
879 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
880 | * based on the sense information. | |
881 | */ | |
882 | case TEST_UNIT_READY: | |
883 | break; | |
c50bd448 S |
884 | default: |
885 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
886 | } | |
887 | break; | |
888 | case SRB_STATUS_INVALID_LUN: | |
889 | do_work = true; | |
890 | process_err_fn = storvsc_remove_lun; | |
891 | break; | |
6781209e S |
892 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
893 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
894 | do_work = true; | |
895 | process_err_fn = storvsc_device_scan; | |
896 | /* | |
897 | * Retry the I/O that trigerred this. | |
898 | */ | |
899 | set_host_byte(scmnd, DID_REQUEUE); | |
900 | } | |
901 | break; | |
c50bd448 | 902 | } |
6781209e | 903 | |
c50bd448 S |
904 | if (!do_work) |
905 | return; | |
906 | ||
907 | /* | |
908 | * We need to schedule work to process this error; schedule it. | |
909 | */ | |
910 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
911 | if (!wrk) { | |
912 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
913 | return; | |
914 | } | |
915 | ||
916 | wrk->host = host; | |
917 | wrk->lun = vm_srb->lun; | |
918 | INIT_WORK(&wrk->work, process_err_fn); | |
919 | schedule_work(&wrk->work); | |
920 | } | |
921 | ||
2707388c | 922 | |
61eaffc9 | 923 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 924 | { |
2707388c S |
925 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
926 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
2707388c S |
927 | struct scsi_sense_hdr sense_hdr; |
928 | struct vmscsi_request *vm_srb; | |
c50bd448 S |
929 | struct Scsi_Host *host; |
930 | struct storvsc_device *stor_dev; | |
931 | struct hv_device *dev = host_dev->dev; | |
be0cf6ca S |
932 | u32 payload_sz = cmd_request->payload_sz; |
933 | void *payload = cmd_request->payload; | |
c50bd448 S |
934 | |
935 | stor_dev = get_in_stor_device(dev); | |
936 | host = stor_dev->host; | |
8dcf37d4 | 937 | |
61eaffc9 | 938 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8dcf37d4 | 939 | |
42e22cac S |
940 | scmnd->result = vm_srb->scsi_status; |
941 | ||
2707388c S |
942 | if (scmnd->result) { |
943 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
944 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
d811b848 HR |
945 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
946 | &sense_hdr); | |
2707388c S |
947 | } |
948 | ||
c50bd448 S |
949 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
950 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
951 | sense_hdr.ascq); | |
952 | ||
2707388c | 953 | scsi_set_resid(scmnd, |
be0cf6ca | 954 | cmd_request->payload->range.len - |
2707388c S |
955 | vm_srb->data_transfer_length); |
956 | ||
ead3700d | 957 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
958 | |
959 | if (payload_sz > | |
960 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
961 | kfree(payload); | |
2707388c S |
962 | } |
963 | ||
964 | static void storvsc_on_io_completion(struct hv_device *device, | |
965 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 966 | struct storvsc_cmd_request *request) |
2707388c S |
967 | { |
968 | struct storvsc_device *stor_device; | |
969 | struct vstor_packet *stor_pkt; | |
970 | ||
971 | stor_device = hv_get_drvdata(device); | |
972 | stor_pkt = &request->vstor_packet; | |
973 | ||
974 | /* | |
975 | * The current SCSI handling on the host side does | |
976 | * not correctly handle: | |
977 | * INQUIRY command with page code parameter set to 0x80 | |
978 | * MODE_SENSE command with cmd[2] == 0x1c | |
979 | * | |
980 | * Setup srb and scsi status so this won't be fatal. | |
981 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
982 | * (srb status == 0x4) and off-line the device in that case. |
983 | */ | |
984 | ||
985 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 986 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 987 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 988 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
989 | } |
990 | ||
8dcf37d4 S |
991 | |
992 | /* Copy over the status...etc */ | |
993 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
994 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
995 | stor_pkt->vm_srb.sense_info_length = | |
996 | vstor_packet->vm_srb.sense_info_length; | |
997 | ||
8dcf37d4 S |
998 | |
999 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1000 | /* CHECK_CONDITION */ | |
16046320 S |
1001 | if (vstor_packet->vm_srb.srb_status & |
1002 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1003 | /* autosense data available */ |
8dcf37d4 | 1004 | |
ead3700d | 1005 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1006 | vstor_packet->vm_srb.sense_data, |
1007 | vstor_packet->vm_srb.sense_info_length); | |
1008 | ||
1009 | } | |
1010 | } | |
1011 | ||
1012 | stor_pkt->vm_srb.data_transfer_length = | |
1013 | vstor_packet->vm_srb.data_transfer_length; | |
1014 | ||
2707388c | 1015 | storvsc_command_completion(request); |
8dcf37d4 S |
1016 | |
1017 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1018 | stor_device->drain_notify) | |
1019 | wake_up(&stor_device->waiting_to_drain); | |
1020 | ||
1021 | ||
1022 | } | |
1023 | ||
1024 | static void storvsc_on_receive(struct hv_device *device, | |
1025 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1026 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1027 | { |
12675799 S |
1028 | struct storvsc_scan_work *work; |
1029 | struct storvsc_device *stor_device; | |
1030 | ||
8dcf37d4 S |
1031 | switch (vstor_packet->operation) { |
1032 | case VSTOR_OPERATION_COMPLETE_IO: | |
1033 | storvsc_on_io_completion(device, vstor_packet, request); | |
1034 | break; | |
12675799 | 1035 | |
8dcf37d4 | 1036 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
1037 | case VSTOR_OPERATION_ENUMERATE_BUS: |
1038 | stor_device = get_in_stor_device(device); | |
1039 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1040 | if (!work) | |
1041 | return; | |
1042 | ||
2a09ed3d | 1043 | INIT_WORK(&work->work, storvsc_host_scan); |
12675799 S |
1044 | work->host = stor_device->host; |
1045 | schedule_work(&work->work); | |
1046 | break; | |
8dcf37d4 S |
1047 | |
1048 | default: | |
1049 | break; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | static void storvsc_on_channel_callback(void *context) | |
1054 | { | |
6f94d5de S |
1055 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1056 | struct hv_device *device; | |
8dcf37d4 S |
1057 | struct storvsc_device *stor_device; |
1058 | u32 bytes_recvd; | |
1059 | u64 request_id; | |
1060 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1061 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1062 | int ret; |
1063 | ||
6f94d5de S |
1064 | if (channel->primary_channel != NULL) |
1065 | device = channel->primary_channel->device_obj; | |
1066 | else | |
1067 | device = channel->device_obj; | |
8dcf37d4 S |
1068 | |
1069 | stor_device = get_in_stor_device(device); | |
1070 | if (!stor_device) | |
1071 | return; | |
1072 | ||
1073 | do { | |
6f94d5de | 1074 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1075 | ALIGN((sizeof(struct vstor_packet) - |
1076 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1077 | &bytes_recvd, &request_id); |
1078 | if (ret == 0 && bytes_recvd > 0) { | |
1079 | ||
61eaffc9 | 1080 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1081 | (unsigned long)request_id; |
1082 | ||
1083 | if ((request == &stor_device->init_request) || | |
1084 | (request == &stor_device->reset_request)) { | |
1085 | ||
1086 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1087 | (sizeof(struct vstor_packet) - |
1088 | vmscsi_size_delta)); | |
8dcf37d4 S |
1089 | complete(&request->wait_event); |
1090 | } else { | |
1091 | storvsc_on_receive(device, | |
1092 | (struct vstor_packet *)packet, | |
1093 | request); | |
1094 | } | |
1095 | } else { | |
1096 | break; | |
1097 | } | |
1098 | } while (1); | |
1099 | ||
1100 | return; | |
1101 | } | |
1102 | ||
1103 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1104 | { | |
1105 | struct vmstorage_channel_properties props; | |
1106 | int ret; | |
1107 | ||
1108 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1109 | ||
8dcf37d4 S |
1110 | ret = vmbus_open(device->channel, |
1111 | ring_size, | |
1112 | ring_size, | |
1113 | (void *)&props, | |
1114 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1115 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1116 | |
1117 | if (ret != 0) | |
1118 | return ret; | |
1119 | ||
1120 | ret = storvsc_channel_init(device); | |
1121 | ||
1122 | return ret; | |
1123 | } | |
1124 | ||
c1b3d067 | 1125 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1126 | { |
1127 | struct storvsc_device *stor_device; | |
1128 | unsigned long flags; | |
1129 | ||
cd654ea1 | 1130 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1131 | |
1132 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1133 | stor_device->destroy = true; | |
1134 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1135 | ||
1136 | /* | |
1137 | * At this point, all outbound traffic should be disable. We | |
1138 | * only allow inbound traffic (responses) to proceed so that | |
1139 | * outstanding requests can be completed. | |
1140 | */ | |
1141 | ||
1142 | storvsc_wait_to_drain(stor_device); | |
1143 | ||
1144 | /* | |
1145 | * Since we have already drained, we don't need to busy wait | |
1146 | * as was done in final_release_stor_device() | |
1147 | * Note that we cannot set the ext pointer to NULL until | |
1148 | * we have drained - to drain the outgoing packets, we need to | |
1149 | * allow incoming packets. | |
1150 | */ | |
1151 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1152 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1153 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1154 | ||
1155 | /* Close the channel */ | |
1156 | vmbus_close(device->channel); | |
1157 | ||
1158 | kfree(stor_device); | |
1159 | return 0; | |
1160 | } | |
1161 | ||
c1b3d067 | 1162 | static int storvsc_do_io(struct hv_device *device, |
be0cf6ca | 1163 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1164 | { |
1165 | struct storvsc_device *stor_device; | |
1166 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1167 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 S |
1168 | int ret = 0; |
1169 | ||
1170 | vstor_packet = &request->vstor_packet; | |
1171 | stor_device = get_out_stor_device(device); | |
1172 | ||
1173 | if (!stor_device) | |
1174 | return -ENODEV; | |
1175 | ||
1176 | ||
1177 | request->device = device; | |
6f94d5de S |
1178 | /* |
1179 | * Select an an appropriate channel to send the request out. | |
1180 | */ | |
1181 | ||
1182 | outgoing_channel = vmbus_get_outgoing_channel(device->channel); | |
8dcf37d4 S |
1183 | |
1184 | ||
1185 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1186 | ||
8b612fa2 S |
1187 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1188 | vmscsi_size_delta); | |
8dcf37d4 S |
1189 | |
1190 | ||
8b612fa2 | 1191 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1192 | |
1193 | ||
1194 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1195 | request->payload->range.len; |
8dcf37d4 S |
1196 | |
1197 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1198 | ||
be0cf6ca S |
1199 | if (request->payload->range.len) { |
1200 | ||
1201 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1202 | request->payload, request->payload_sz, | |
8dcf37d4 | 1203 | vstor_packet, |
8b612fa2 S |
1204 | (sizeof(struct vstor_packet) - |
1205 | vmscsi_size_delta), | |
8dcf37d4 S |
1206 | (unsigned long)request); |
1207 | } else { | |
0147dabc | 1208 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 S |
1209 | (sizeof(struct vstor_packet) - |
1210 | vmscsi_size_delta), | |
8dcf37d4 S |
1211 | (unsigned long)request, |
1212 | VM_PKT_DATA_INBAND, | |
1213 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1214 | } | |
1215 | ||
1216 | if (ret != 0) | |
1217 | return ret; | |
1218 | ||
1219 | atomic_inc(&stor_device->num_outstanding_req); | |
1220 | ||
1221 | return ret; | |
1222 | } | |
1223 | ||
419f2d03 S |
1224 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1225 | { | |
419f2d03 | 1226 | |
419f2d03 S |
1227 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1228 | ||
419f2d03 | 1229 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1230 | |
893def38 S |
1231 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1232 | ||
81988a0e VK |
1233 | /* Ensure there are no gaps in presented sgls */ |
1234 | blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); | |
1235 | ||
3e8f4f40 OH |
1236 | sdevice->no_write_same = 1; |
1237 | ||
f3cfabce S |
1238 | /* |
1239 | * Add blist flags to permit the reading of the VPD pages even when | |
1240 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1241 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1242 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1243 | */ | |
1244 | sdevice->sdev_bflags |= msft_blist_flags; | |
1245 | ||
b0a93d96 S |
1246 | /* |
1247 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1248 | * if the device is a MSFT virtual device. If the host is |
1249 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1250 | */ |
1251 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1252 | switch (vmstor_proto_version) { |
1253 | case VMSTOR_PROTO_VERSION_WIN8: | |
1254 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1255 | sdevice->scsi_level = SCSI_SPC_3; |
1256 | break; | |
1257 | } | |
b95f5be0 KM |
1258 | |
1259 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1260 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1261 | } |
1262 | ||
419f2d03 S |
1263 | return 0; |
1264 | } | |
1265 | ||
62838ce2 S |
1266 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1267 | sector_t capacity, int *info) | |
1268 | { | |
5326fd5c S |
1269 | sector_t nsect = capacity; |
1270 | sector_t cylinders = nsect; | |
1271 | int heads, sectors_pt; | |
62838ce2 | 1272 | |
5326fd5c S |
1273 | /* |
1274 | * We are making up these values; let us keep it simple. | |
1275 | */ | |
1276 | heads = 0xff; | |
1277 | sectors_pt = 0x3f; /* Sectors per track */ | |
1278 | sector_div(cylinders, heads * sectors_pt); | |
1279 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1280 | cylinders = 0xffff; | |
62838ce2 S |
1281 | |
1282 | info[0] = heads; | |
5326fd5c S |
1283 | info[1] = sectors_pt; |
1284 | info[2] = (int)cylinders; | |
62838ce2 | 1285 | |
62838ce2 S |
1286 | return 0; |
1287 | } | |
aa3d789e | 1288 | |
4b270c8b | 1289 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1290 | { |
4b270c8b S |
1291 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1292 | struct hv_device *device = host_dev->dev; | |
1293 | ||
aa3d789e | 1294 | struct storvsc_device *stor_device; |
61eaffc9 | 1295 | struct storvsc_cmd_request *request; |
aa3d789e S |
1296 | struct vstor_packet *vstor_packet; |
1297 | int ret, t; | |
1298 | ||
aa3d789e | 1299 | |
1eaaddf9 | 1300 | stor_device = get_out_stor_device(device); |
aa3d789e | 1301 | if (!stor_device) |
a00e8224 | 1302 | return FAILED; |
aa3d789e S |
1303 | |
1304 | request = &stor_device->reset_request; | |
1305 | vstor_packet = &request->vstor_packet; | |
1306 | ||
1307 | init_completion(&request->wait_event); | |
1308 | ||
1309 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1310 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1311 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1312 | ||
1313 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1314 | (sizeof(struct vstor_packet) - |
1315 | vmscsi_size_delta), | |
aa3d789e S |
1316 | (unsigned long)&stor_device->reset_request, |
1317 | VM_PKT_DATA_INBAND, | |
1318 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1319 | if (ret != 0) | |
a00e8224 | 1320 | return FAILED; |
aa3d789e | 1321 | |
46d2eb6d | 1322 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1323 | if (t == 0) |
1324 | return TIMEOUT_ERROR; | |
aa3d789e | 1325 | |
aa3d789e S |
1326 | |
1327 | /* | |
1328 | * At this point, all outstanding requests in the adapter | |
1329 | * should have been flushed out and return to us | |
5c1b10ab S |
1330 | * There is a potential race here where the host may be in |
1331 | * the process of responding when we return from here. | |
1332 | * Just wait for all in-transit packets to be accounted for | |
1333 | * before we return from here. | |
aa3d789e | 1334 | */ |
5c1b10ab | 1335 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1336 | |
a00e8224 | 1337 | return SUCCESS; |
aa3d789e S |
1338 | } |
1339 | ||
56b26e69 S |
1340 | /* |
1341 | * The host guarantees to respond to each command, although I/O latencies might | |
1342 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1343 | * chance to perform EH. | |
1344 | */ | |
1345 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1346 | { | |
1347 | return BLK_EH_RESET_TIMER; | |
1348 | } | |
1349 | ||
c77b63b6 | 1350 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1351 | { |
1352 | bool allowed = true; | |
1353 | u8 scsi_op = scmnd->cmnd[0]; | |
1354 | ||
1355 | switch (scsi_op) { | |
3e8f4f40 OH |
1356 | /* the host does not handle WRITE_SAME, log accident usage */ |
1357 | case WRITE_SAME: | |
c77b63b6 S |
1358 | /* |
1359 | * smartd sends this command and the host does not handle | |
1360 | * this. So, don't send it. | |
1361 | */ | |
41098f8f | 1362 | case SET_WINDOW: |
59e00e74 | 1363 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1364 | allowed = false; |
1365 | break; | |
1366 | default: | |
1367 | break; | |
92ae4ebd OH |
1368 | } |
1369 | return allowed; | |
1370 | } | |
c5b463ae | 1371 | |
bab445e1 | 1372 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1373 | { |
1374 | int ret; | |
bab445e1 | 1375 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1376 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1377 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1378 | int i; |
1379 | struct scatterlist *sgl; | |
1380 | unsigned int sg_count = 0; | |
1381 | struct vmscsi_request *vm_srb; | |
aaced993 | 1382 | struct scatterlist *cur_sgl; |
be0cf6ca S |
1383 | struct vmbus_packet_mpb_array *payload; |
1384 | u32 payload_sz; | |
1385 | u32 length; | |
c5b463ae | 1386 | |
2492fd7a | 1387 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1388 | /* |
1389 | * On legacy hosts filter unimplemented commands. | |
1390 | * Future hosts are expected to correctly handle | |
1391 | * unsupported commands. Furthermore, it is | |
1392 | * possible that some of the currently | |
1393 | * unsupported commands maybe supported in | |
1394 | * future versions of the host. | |
1395 | */ | |
1396 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1397 | scmnd->scsi_done(scmnd); | |
1398 | return 0; | |
1399 | } | |
92ae4ebd | 1400 | } |
c5b463ae | 1401 | |
c5b463ae | 1402 | /* Setup the cmd request */ |
c5b463ae S |
1403 | cmd_request->cmd = scmnd; |
1404 | ||
61eaffc9 | 1405 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1406 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1407 | |
f885fb73 | 1408 | vm_srb->win8_extension.srb_flags |= |
8cf308e1 | 1409 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae S |
1410 | |
1411 | /* Build the SRB */ | |
1412 | switch (scmnd->sc_data_direction) { | |
1413 | case DMA_TO_DEVICE: | |
1414 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1415 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1416 | break; |
1417 | case DMA_FROM_DEVICE: | |
1418 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1419 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1420 | break; |
cb1cf080 | 1421 | case DMA_NONE: |
c5b463ae | 1422 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1423 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1424 | break; |
cb1cf080 VK |
1425 | default: |
1426 | /* | |
1427 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1428 | * supposed to see here. | |
1429 | */ | |
1430 | WARN(1, "Unexpected data direction: %d\n", | |
1431 | scmnd->sc_data_direction); | |
1432 | return -EINVAL; | |
c5b463ae S |
1433 | } |
1434 | ||
c5b463ae | 1435 | |
c5b463ae S |
1436 | vm_srb->port_number = host_dev->port; |
1437 | vm_srb->path_id = scmnd->device->channel; | |
1438 | vm_srb->target_id = scmnd->device->id; | |
1439 | vm_srb->lun = scmnd->device->lun; | |
1440 | ||
c5b463ae S |
1441 | vm_srb->cdb_length = scmnd->cmd_len; |
1442 | ||
1443 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1444 | ||
be0cf6ca S |
1445 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1446 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1447 | |
be0cf6ca S |
1448 | length = scsi_bufflen(scmnd); |
1449 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1450 | payload_sz = sizeof(cmd_request->mpb); | |
1451 | ||
1452 | if (sg_count) { | |
be0cf6ca S |
1453 | if (sg_count > MAX_PAGE_BUFFER_COUNT) { |
1454 | ||
1455 | payload_sz = (sg_count * sizeof(void *) + | |
1456 | sizeof(struct vmbus_packet_mpb_array)); | |
1457 | payload = kmalloc(payload_sz, GFP_ATOMIC); | |
81988a0e VK |
1458 | if (!payload) |
1459 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1460 | } |
1461 | ||
1462 | payload->range.len = length; | |
1463 | payload->range.offset = sgl[0].offset; | |
1464 | ||
aaced993 S |
1465 | cur_sgl = sgl; |
1466 | for (i = 0; i < sg_count; i++) { | |
be0cf6ca | 1467 | payload->range.pfn_array[i] = |
aaced993 S |
1468 | page_to_pfn(sg_page((cur_sgl))); |
1469 | cur_sgl = sg_next(cur_sgl); | |
1470 | } | |
c5b463ae S |
1471 | |
1472 | } else if (scsi_sglist(scmnd)) { | |
be0cf6ca S |
1473 | payload->range.len = length; |
1474 | payload->range.offset = | |
c5b463ae | 1475 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
be0cf6ca | 1476 | payload->range.pfn_array[0] = |
c5b463ae S |
1477 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1478 | } | |
1479 | ||
be0cf6ca S |
1480 | cmd_request->payload = payload; |
1481 | cmd_request->payload_sz = payload_sz; | |
1482 | ||
c5b463ae | 1483 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1484 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1485 | |
d2598f01 | 1486 | if (ret == -EAGAIN) { |
c5b463ae | 1487 | /* no more space */ |
ead3700d | 1488 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1489 | } |
1490 | ||
c77b63b6 | 1491 | return 0; |
c5b463ae S |
1492 | } |
1493 | ||
bef4a34a | 1494 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1495 | .module = THIS_MODULE, |
1496 | .name = "storvsc_host_t", | |
ead3700d | 1497 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1498 | .bios_param = storvsc_get_chs, |
1499 | .queuecommand = storvsc_queuecommand, | |
1500 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1501 | .proc_name = "storvsc_host", |
56b26e69 | 1502 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1503 | .slave_configure = storvsc_device_configure, |
52f9614d | 1504 | .cmd_per_lun = 255, |
ff568d3a | 1505 | .this_id = -1, |
be0cf6ca | 1506 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1507 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1508 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1509 | .no_write_same = 1, |
bef4a34a HJ |
1510 | }; |
1511 | ||
ef52a81b S |
1512 | enum { |
1513 | SCSI_GUID, | |
1514 | IDE_GUID, | |
bde6d0f9 | 1515 | SFC_GUID, |
ef52a81b S |
1516 | }; |
1517 | ||
d847b5fe | 1518 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1519 | /* SCSI guid */ |
35c3bc20 S |
1520 | { HV_SCSI_GUID, |
1521 | .driver_data = SCSI_GUID | |
1522 | }, | |
21e37742 | 1523 | /* IDE guid */ |
35c3bc20 S |
1524 | { HV_IDE_GUID, |
1525 | .driver_data = IDE_GUID | |
1526 | }, | |
bde6d0f9 S |
1527 | /* Fibre Channel GUID */ |
1528 | { | |
1529 | HV_SYNTHFC_GUID, | |
1530 | .driver_data = SFC_GUID | |
1531 | }, | |
c45cf2d4 | 1532 | { }, |
d847b5fe | 1533 | }; |
bef4a34a | 1534 | |
d847b5fe | 1535 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1536 | |
84946899 S |
1537 | static int storvsc_probe(struct hv_device *device, |
1538 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1539 | { |
ff568d3a | 1540 | int ret; |
f458aada | 1541 | int num_cpus = num_online_cpus(); |
bef4a34a | 1542 | struct Scsi_Host *host; |
795b613d | 1543 | struct hv_host_device *host_dev; |
ef52a81b | 1544 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1545 | int target = 0; |
6e4198ce | 1546 | struct storvsc_device *stor_device; |
0fb8db29 S |
1547 | int max_luns_per_target; |
1548 | int max_targets; | |
1549 | int max_channels; | |
f458aada | 1550 | int max_sub_channels = 0; |
bd1f5d6a | 1551 | |
8b612fa2 S |
1552 | /* |
1553 | * Based on the windows host we are running on, | |
1554 | * set state to properly communicate with the host. | |
1555 | */ | |
1556 | ||
6ee5c615 | 1557 | if (vmbus_proto_version < VERSION_WIN8) { |
0fb8db29 S |
1558 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1559 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1560 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1561 | } else { |
0fb8db29 S |
1562 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1563 | max_targets = STORVSC_MAX_TARGETS; | |
1564 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada S |
1565 | /* |
1566 | * On Windows8 and above, we support sub-channels for storage. | |
1567 | * The number of sub-channels offerred is based on the number of | |
1568 | * VCPUs in the guest. | |
1569 | */ | |
1570 | max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); | |
8b612fa2 S |
1571 | } |
1572 | ||
f458aada S |
1573 | scsi_driver.can_queue = (max_outstanding_req_per_channel * |
1574 | (max_sub_channels + 1)); | |
1575 | ||
ff568d3a | 1576 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1577 | sizeof(struct hv_host_device)); |
f8feed06 | 1578 | if (!host) |
bef4a34a | 1579 | return -ENOMEM; |
bef4a34a | 1580 | |
7f33f30a | 1581 | host_dev = shost_priv(host); |
795b613d | 1582 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1583 | |
795b613d | 1584 | host_dev->port = host->host_no; |
97c15296 | 1585 | host_dev->dev = device; |
bef4a34a | 1586 | |
4e03e697 | 1587 | |
a13d35ab | 1588 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1589 | if (!stor_device) { |
225ce6ea | 1590 | ret = -ENOMEM; |
ce3e301c | 1591 | goto err_out0; |
6e4198ce | 1592 | } |
9efd21e1 | 1593 | |
a13d35ab | 1594 | stor_device->destroy = false; |
6f94d5de | 1595 | stor_device->open_sub_channel = false; |
a13d35ab S |
1596 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1597 | stor_device->device = device; | |
cd654ea1 S |
1598 | stor_device->host = host; |
1599 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1600 | |
6e4198ce S |
1601 | stor_device->port_number = host->host_no; |
1602 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1603 | if (ret) |
ce3e301c | 1604 | goto err_out1; |
bef4a34a | 1605 | |
6e4198ce S |
1606 | host_dev->path = stor_device->path_id; |
1607 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1608 | |
4cd83ecd S |
1609 | switch (dev_id->driver_data) { |
1610 | case SFC_GUID: | |
1611 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1612 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1613 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
1614 | break; | |
1615 | ||
1616 | case SCSI_GUID: | |
0fb8db29 S |
1617 | host->max_lun = max_luns_per_target; |
1618 | host->max_id = max_targets; | |
1619 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1620 | break; |
1621 | ||
1622 | default: | |
1623 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1624 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1625 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1626 | break; | |
1627 | } | |
cf55f4a8 MS |
1628 | /* max cmd length */ |
1629 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1630 | |
be0cf6ca S |
1631 | /* |
1632 | * set the table size based on the info we got | |
1633 | * from the host. | |
1634 | */ | |
1635 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
1636 | ||
454f18a9 | 1637 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1638 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1639 | if (ret != 0) |
ce3e301c | 1640 | goto err_out2; |
bef4a34a | 1641 | |
bd1f5d6a S |
1642 | if (!dev_is_ide) { |
1643 | scsi_scan_host(host); | |
59d22950 S |
1644 | } else { |
1645 | target = (device->dev_instance.b[5] << 8 | | |
1646 | device->dev_instance.b[4]); | |
1647 | ret = scsi_add_device(host, 0, target, 0); | |
1648 | if (ret) { | |
1649 | scsi_remove_host(host); | |
1650 | goto err_out2; | |
1651 | } | |
bef4a34a | 1652 | } |
bd1f5d6a | 1653 | return 0; |
bef4a34a | 1654 | |
ce3e301c | 1655 | err_out2: |
225ce6ea S |
1656 | /* |
1657 | * Once we have connected with the host, we would need to | |
1658 | * to invoke storvsc_dev_remove() to rollback this state and | |
1659 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1660 | * err_out1 label. |
225ce6ea | 1661 | */ |
bd1f5d6a | 1662 | storvsc_dev_remove(device); |
ce3e301c | 1663 | goto err_out0; |
225ce6ea S |
1664 | |
1665 | err_out1: | |
ce3e301c | 1666 | kfree(stor_device); |
225ce6ea S |
1667 | |
1668 | err_out0: | |
bd1f5d6a | 1669 | scsi_host_put(host); |
225ce6ea | 1670 | return ret; |
bef4a34a HJ |
1671 | } |
1672 | ||
ddcbf65e S |
1673 | static int storvsc_remove(struct hv_device *dev) |
1674 | { | |
1675 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1676 | struct Scsi_Host *host = stor_device->host; | |
1677 | ||
1678 | scsi_remove_host(host); | |
1679 | storvsc_dev_remove(dev); | |
1680 | scsi_host_put(host); | |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
40bf63ed | 1685 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1686 | .name = KBUILD_MODNAME, |
d847b5fe | 1687 | .id_table = id_table, |
40bf63ed S |
1688 | .probe = storvsc_probe, |
1689 | .remove = storvsc_remove, | |
39ae6fae | 1690 | }; |
7bd05b91 | 1691 | |
d9bbae83 | 1692 | static int __init storvsc_drv_init(void) |
f5c78872 | 1693 | { |
01415ab3 S |
1694 | |
1695 | /* | |
1696 | * Divide the ring buffer data size (which is 1 page less | |
1697 | * than the ring buffer size since that page is reserved for | |
1698 | * the ring buffer indices) by the max request size (which is | |
1699 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1700 | */ | |
01415ab3 | 1701 | max_outstanding_req_per_channel = |
768fa219 GKH |
1702 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1703 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1704 | sizeof(struct vstor_packet) + sizeof(u64) - |
1705 | vmscsi_size_delta, | |
768fa219 | 1706 | sizeof(u64))); |
f5c78872 | 1707 | |
768fa219 | 1708 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1709 | } |
1710 | ||
c63ba9e1 | 1711 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1712 | { |
768fa219 | 1713 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1714 | } |
1715 | ||
ff568d3a | 1716 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1717 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1718 | module_init(storvsc_drv_init); |
c63ba9e1 | 1719 | module_exit(storvsc_drv_exit); |