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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> |
dac58241 | 44 | #include <scsi/scsi_transport_fc.h> |
d791a8c6 | 45 | #include <scsi/scsi_transport.h> |
3f335ea2 | 46 | |
09f0355f | 47 | /* |
af9584b8 S |
48 | * All wire protocol details (storage protocol between the guest and the host) |
49 | * are consolidated here. | |
50 | * | |
51 | * Begin protocol definitions. | |
09f0355f S |
52 | */ |
53 | ||
09f0355f S |
54 | /* |
55 | * Version history: | |
56 | * V1 Beta: 0.1 | |
57 | * V1 RC < 2008/1/31: 1.0 | |
58 | * V1 RC > 2008/1/31: 2.0 | |
59 | * Win7: 4.2 | |
8b612fa2 | 60 | * Win8: 5.1 |
1a363108 KM |
61 | * Win8.1: 6.0 |
62 | * Win10: 6.2 | |
09f0355f S |
63 | */ |
64 | ||
2492fd7a KM |
65 | #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
66 | (((MINOR_) & 0xff))) | |
8b612fa2 | 67 | |
1a363108 | 68 | #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
2492fd7a KM |
69 | #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
70 | #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) | |
1a363108 KM |
71 | #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
72 | #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) | |
f0d79fe9 | 73 | |
f0d79fe9 S |
74 | /* Packet structure describing virtual storage requests. */ |
75 | enum vstor_packet_operation { | |
76 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
77 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
78 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
79 | VSTOR_OPERATION_RESET_LUN = 4, | |
80 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
81 | VSTOR_OPERATION_RESET_BUS = 6, | |
82 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
83 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
84 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
85 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 86 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
87 | VSTOR_OPERATION_FCHBA_DATA = 12, |
88 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
89 | VSTOR_OPERATION_MAXIMUM = 13 | |
90 | }; | |
91 | ||
92 | /* | |
93 | * WWN packet for Fibre Channel HBA | |
94 | */ | |
95 | ||
96 | struct hv_fc_wwn_packet { | |
83d1e8b9 S |
97 | u8 primary_active; |
98 | u8 reserved1[3]; | |
8b612fa2 S |
99 | u8 primary_port_wwn[8]; |
100 | u8 primary_node_wwn[8]; | |
101 | u8 secondary_port_wwn[8]; | |
102 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
103 | }; |
104 | ||
8b612fa2 S |
105 | |
106 | ||
107 | /* | |
108 | * SRB Flag Bits | |
109 | */ | |
110 | ||
111 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
112 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
113 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
114 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
115 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
116 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
117 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
118 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
119 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
120 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
121 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
122 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
123 | ||
124 | /* | |
125 | * This flag indicates the request is part of the workflow for processing a D3. | |
126 | */ | |
127 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
128 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
129 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
130 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
131 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
132 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
133 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
134 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
135 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
136 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
137 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
138 | ||
3cd6d3d9 LL |
139 | #define SP_UNTAGGED ((unsigned char) ~0) |
140 | #define SRB_SIMPLE_TAG_REQUEST 0x20 | |
8b612fa2 | 141 | |
f0d79fe9 S |
142 | /* |
143 | * Platform neutral description of a scsi request - | |
144 | * this remains the same across the write regardless of 32/64 bit | |
145 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
146 | */ | |
6b2f9495 | 147 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
148 | |
149 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
150 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
151 | ||
152 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 153 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 154 | |
8b612fa2 S |
155 | /* |
156 | * Sense buffer size changed in win8; have a run-time | |
cb11fead KM |
157 | * variable to track the size we should use. This value will |
158 | * likely change during protocol negotiation but it is valid | |
159 | * to start by assuming pre-Win8. | |
8b612fa2 | 160 | */ |
cb11fead | 161 | static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
8b612fa2 S |
162 | |
163 | /* | |
cb11fead KM |
164 | * The storage protocol version is determined during the |
165 | * initial exchange with the host. It will indicate which | |
166 | * storage functionality is available in the host. | |
167 | */ | |
2492fd7a | 168 | static int vmstor_proto_version; |
8b612fa2 | 169 | |
f8aea701 LL |
170 | #define STORVSC_LOGGING_NONE 0 |
171 | #define STORVSC_LOGGING_ERROR 1 | |
172 | #define STORVSC_LOGGING_WARN 2 | |
173 | ||
174 | static int logging_level = STORVSC_LOGGING_ERROR; | |
175 | module_param(logging_level, int, S_IRUGO|S_IWUSR); | |
176 | MODULE_PARM_DESC(logging_level, | |
177 | "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); | |
178 | ||
179 | static inline bool do_logging(int level) | |
180 | { | |
181 | return logging_level >= level; | |
182 | } | |
183 | ||
184 | #define storvsc_log(dev, level, fmt, ...) \ | |
185 | do { \ | |
186 | if (do_logging(level)) \ | |
187 | dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ | |
188 | } while (0) | |
189 | ||
8b612fa2 S |
190 | struct vmscsi_win8_extension { |
191 | /* | |
192 | * The following were added in Windows 8 | |
193 | */ | |
194 | u16 reserve; | |
195 | u8 queue_tag; | |
196 | u8 queue_action; | |
197 | u32 srb_flags; | |
198 | u32 time_out_value; | |
199 | u32 queue_sort_ey; | |
200 | } __packed; | |
201 | ||
f0d79fe9 | 202 | struct vmscsi_request { |
c649114a S |
203 | u16 length; |
204 | u8 srb_status; | |
205 | u8 scsi_status; | |
f0d79fe9 | 206 | |
c649114a S |
207 | u8 port_number; |
208 | u8 path_id; | |
209 | u8 target_id; | |
210 | u8 lun; | |
f0d79fe9 | 211 | |
c649114a S |
212 | u8 cdb_length; |
213 | u8 sense_info_length; | |
214 | u8 data_in; | |
215 | u8 reserved; | |
f0d79fe9 | 216 | |
c649114a | 217 | u32 data_transfer_length; |
f0d79fe9 S |
218 | |
219 | union { | |
6b2f9495 S |
220 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
221 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
222 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 223 | }; |
8b612fa2 S |
224 | /* |
225 | * The following was added in win8. | |
226 | */ | |
227 | struct vmscsi_win8_extension win8_extension; | |
228 | ||
f0d79fe9 S |
229 | } __attribute((packed)); |
230 | ||
231 | ||
cb11fead KM |
232 | /* |
233 | * The size of the vmscsi_request has changed in win8. The | |
234 | * additional size is because of new elements added to the | |
235 | * structure. These elements are valid only when we are talking | |
236 | * to a win8 host. | |
237 | * Track the correction to size we need to apply. This value | |
238 | * will likely change during protocol negotiation but it is | |
239 | * valid to start by assuming pre-Win8. | |
240 | */ | |
241 | static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
242 | ||
1a363108 KM |
243 | /* |
244 | * The list of storage protocols in order of preference. | |
245 | */ | |
246 | struct vmstor_protocol { | |
247 | int protocol_version; | |
248 | int sense_buffer_size; | |
249 | int vmscsi_size_delta; | |
250 | }; | |
251 | ||
252 | ||
253 | static const struct vmstor_protocol vmstor_protocols[] = { | |
254 | { | |
255 | VMSTOR_PROTO_VERSION_WIN10, | |
256 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
257 | 0 | |
258 | }, | |
259 | { | |
260 | VMSTOR_PROTO_VERSION_WIN8_1, | |
261 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
262 | 0 | |
263 | }, | |
264 | { | |
265 | VMSTOR_PROTO_VERSION_WIN8, | |
266 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
267 | 0 | |
268 | }, | |
269 | { | |
270 | VMSTOR_PROTO_VERSION_WIN7, | |
271 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
272 | sizeof(struct vmscsi_win8_extension), | |
273 | }, | |
274 | { | |
275 | VMSTOR_PROTO_VERSION_WIN6, | |
276 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
277 | sizeof(struct vmscsi_win8_extension), | |
278 | } | |
279 | }; | |
280 | ||
281 | ||
f0d79fe9 | 282 | /* |
183b8021 | 283 | * This structure is sent during the initialization phase to get the different |
f0d79fe9 S |
284 | * properties of the channel. |
285 | */ | |
8b612fa2 S |
286 | |
287 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
288 | ||
f0d79fe9 | 289 | struct vmstorage_channel_properties { |
8b612fa2 S |
290 | u32 reserved; |
291 | u16 max_channel_cnt; | |
292 | u16 reserved1; | |
f0d79fe9 | 293 | |
8b612fa2 | 294 | u32 flags; |
c649114a | 295 | u32 max_transfer_bytes; |
f0d79fe9 | 296 | |
8b612fa2 | 297 | u64 reserved2; |
f0d79fe9 S |
298 | } __packed; |
299 | ||
300 | /* This structure is sent during the storage protocol negotiations. */ | |
301 | struct vmstorage_protocol_version { | |
302 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 303 | u16 major_minor; |
f0d79fe9 S |
304 | |
305 | /* | |
306 | * Revision number is auto-incremented whenever this file is changed | |
307 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
308 | * definitely indicate incompatibility--but it does indicate mismatched | |
309 | * builds. | |
c649114a | 310 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 311 | */ |
85904a5e | 312 | u16 revision; |
f0d79fe9 S |
313 | } __packed; |
314 | ||
315 | /* Channel Property Flags */ | |
316 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
317 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
318 | ||
319 | struct vstor_packet { | |
320 | /* Requested operation type */ | |
321 | enum vstor_packet_operation operation; | |
322 | ||
323 | /* Flags - see below for values */ | |
c649114a | 324 | u32 flags; |
f0d79fe9 S |
325 | |
326 | /* Status of the request returned from the server side. */ | |
c649114a | 327 | u32 status; |
f0d79fe9 S |
328 | |
329 | /* Data payload area */ | |
330 | union { | |
331 | /* | |
332 | * Structure used to forward SCSI commands from the | |
333 | * client to the server. | |
334 | */ | |
335 | struct vmscsi_request vm_srb; | |
336 | ||
337 | /* Structure used to query channel properties. */ | |
338 | struct vmstorage_channel_properties storage_channel_properties; | |
339 | ||
340 | /* Used during version negotiations. */ | |
341 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
342 | |
343 | /* Fibre channel address packet */ | |
344 | struct hv_fc_wwn_packet wwn_packet; | |
345 | ||
346 | /* Number of sub-channels to create */ | |
347 | u16 sub_channel_count; | |
348 | ||
349 | /* This will be the maximum of the union members */ | |
350 | u8 buffer[0x34]; | |
f0d79fe9 S |
351 | }; |
352 | } __packed; | |
353 | ||
f0d79fe9 | 354 | /* |
09f0355f S |
355 | * Packet Flags: |
356 | * | |
f0d79fe9 S |
357 | * This flag indicates that the server should send back a completion for this |
358 | * packet. | |
359 | */ | |
09f0355f | 360 | |
f0d79fe9 S |
361 | #define REQUEST_COMPLETION_FLAG 0x1 |
362 | ||
f0d79fe9 S |
363 | /* Matches Windows-end */ |
364 | enum storvsc_request_type { | |
c649114a | 365 | WRITE_TYPE = 0, |
f0d79fe9 S |
366 | READ_TYPE, |
367 | UNKNOWN_TYPE, | |
368 | }; | |
369 | ||
16046320 S |
370 | /* |
371 | * SRB status codes and masks; a subset of the codes used here. | |
372 | */ | |
373 | ||
374 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
3209f9d7 | 375 | #define SRB_STATUS_QUEUE_FROZEN 0x40 |
16046320 S |
376 | #define SRB_STATUS_INVALID_LUN 0x20 |
377 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 378 | #define SRB_STATUS_ABORTED 0x02 |
16046320 | 379 | #define SRB_STATUS_ERROR 0x04 |
40630f46 | 380 | #define SRB_STATUS_DATA_OVERRUN 0x12 |
16046320 | 381 | |
3209f9d7 S |
382 | #define SRB_STATUS(status) \ |
383 | (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) | |
af9584b8 S |
384 | /* |
385 | * This is the end of Protocol specific defines. | |
386 | */ | |
387 | ||
b9ec3a55 | 388 | static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
f458aada S |
389 | static u32 max_outstanding_req_per_channel; |
390 | ||
391 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
392 | |
393 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
394 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
395 | ||
f458aada | 396 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
74e26784 | 397 | MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
893def38 S |
398 | /* |
399 | * Timeout in seconds for all devices managed by this driver. | |
400 | */ | |
401 | static int storvsc_timeout = 180; | |
402 | ||
dac58241 S |
403 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
404 | static struct scsi_transport_template *fc_transport_template; | |
405 | #endif | |
af9584b8 | 406 | |
6f94d5de S |
407 | static void storvsc_on_channel_callback(void *context); |
408 | ||
4cd83ecd S |
409 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
410 | #define STORVSC_MAX_TARGETS 2 | |
411 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 412 | |
4cd83ecd S |
413 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
414 | #define STORVSC_FC_MAX_TARGETS 128 | |
415 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 416 | |
4cd83ecd S |
417 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
418 | #define STORVSC_IDE_MAX_TARGETS 1 | |
419 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 420 | |
61eaffc9 | 421 | struct storvsc_cmd_request { |
61eaffc9 S |
422 | struct scsi_cmnd *cmd; |
423 | ||
f0d79fe9 S |
424 | struct hv_device *device; |
425 | ||
426 | /* Synchronize the request/response if needed */ | |
427 | struct completion wait_event; | |
428 | ||
be0cf6ca S |
429 | struct vmbus_channel_packet_multipage_buffer mpb; |
430 | struct vmbus_packet_mpb_array *payload; | |
431 | u32 payload_sz; | |
432 | ||
f0d79fe9 S |
433 | struct vstor_packet vstor_packet; |
434 | }; | |
435 | ||
436 | ||
f0d79fe9 S |
437 | /* A storvsc device is a device object that contains a vmbus channel */ |
438 | struct storvsc_device { | |
439 | struct hv_device *device; | |
440 | ||
441 | bool destroy; | |
442 | bool drain_notify; | |
6f94d5de | 443 | bool open_sub_channel; |
f0d79fe9 | 444 | atomic_t num_outstanding_req; |
cd654ea1 | 445 | struct Scsi_Host *host; |
f0d79fe9 S |
446 | |
447 | wait_queue_head_t waiting_to_drain; | |
448 | ||
449 | /* | |
450 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
451 | * controller. In reality, the pathid, targetid is always 0 | |
452 | * and the port is set by us | |
453 | */ | |
454 | unsigned int port_number; | |
455 | unsigned char path_id; | |
456 | unsigned char target_id; | |
457 | ||
5117b936 S |
458 | /* |
459 | * Max I/O, the device can support. | |
460 | */ | |
461 | u32 max_transfer_bytes; | |
d86adf48 S |
462 | /* |
463 | * Number of sub-channels we will open. | |
464 | */ | |
465 | u16 num_sc; | |
466 | struct vmbus_channel **stor_chns; | |
467 | /* | |
468 | * Mask of CPUs bound to subchannels. | |
469 | */ | |
470 | struct cpumask alloced_cpus; | |
f0d79fe9 | 471 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
472 | struct storvsc_cmd_request init_request; |
473 | struct storvsc_cmd_request reset_request; | |
dac58241 S |
474 | /* |
475 | * Currently active port and node names for FC devices. | |
476 | */ | |
477 | u64 node_name; | |
478 | u64 port_name; | |
daf0cd44 CA |
479 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
480 | struct fc_rport *rport; | |
481 | #endif | |
f0d79fe9 S |
482 | }; |
483 | ||
ce3e301c S |
484 | struct hv_host_device { |
485 | struct hv_device *dev; | |
c1b3d067 S |
486 | unsigned int port; |
487 | unsigned char path; | |
488 | unsigned char target; | |
436ad941 | 489 | struct workqueue_struct *handle_error_wq; |
c58cc70f LL |
490 | struct work_struct host_scan_work; |
491 | struct Scsi_Host *host; | |
c1b3d067 S |
492 | }; |
493 | ||
12675799 S |
494 | struct storvsc_scan_work { |
495 | struct work_struct work; | |
496 | struct Scsi_Host *host; | |
98441221 S |
497 | u8 lun; |
498 | u8 tgt_id; | |
12675799 S |
499 | }; |
500 | ||
6781209e S |
501 | static void storvsc_device_scan(struct work_struct *work) |
502 | { | |
503 | struct storvsc_scan_work *wrk; | |
6781209e S |
504 | struct scsi_device *sdev; |
505 | ||
506 | wrk = container_of(work, struct storvsc_scan_work, work); | |
6781209e | 507 | |
98441221 | 508 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
6781209e S |
509 | if (!sdev) |
510 | goto done; | |
511 | scsi_rescan_device(&sdev->sdev_gendev); | |
512 | scsi_device_put(sdev); | |
513 | ||
514 | done: | |
515 | kfree(wrk); | |
516 | } | |
517 | ||
2a09ed3d | 518 | static void storvsc_host_scan(struct work_struct *work) |
12675799 | 519 | { |
2a09ed3d | 520 | struct Scsi_Host *host; |
34a716bc | 521 | struct scsi_device *sdev; |
c58cc70f LL |
522 | struct hv_host_device *host_device = |
523 | container_of(work, struct hv_host_device, host_scan_work); | |
12675799 | 524 | |
c58cc70f | 525 | host = host_device->host; |
34a716bc S |
526 | /* |
527 | * Before scanning the host, first check to see if any of the | |
528 | * currrently known devices have been hot removed. We issue a | |
529 | * "unit ready" command against all currently known devices. | |
530 | * This I/O will result in an error for devices that have been | |
531 | * removed. As part of handling the I/O error, we remove the device. | |
532 | * | |
533 | * When a LUN is added or removed, the host sends us a signal to | |
534 | * scan the host. Thus we are forced to discover the LUNs that | |
535 | * may have been removed this way. | |
536 | */ | |
537 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 538 | shost_for_each_device(sdev, host) |
34a716bc | 539 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
540 | mutex_unlock(&host->scan_mutex); |
541 | /* | |
542 | * Now scan the host to discover LUNs that may have been added. | |
543 | */ | |
2a09ed3d | 544 | scsi_scan_host(host); |
12675799 S |
545 | } |
546 | ||
b4017319 S |
547 | static void storvsc_remove_lun(struct work_struct *work) |
548 | { | |
549 | struct storvsc_scan_work *wrk; | |
550 | struct scsi_device *sdev; | |
551 | ||
552 | wrk = container_of(work, struct storvsc_scan_work, work); | |
553 | if (!scsi_host_get(wrk->host)) | |
554 | goto done; | |
555 | ||
98441221 | 556 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
b4017319 S |
557 | |
558 | if (sdev) { | |
559 | scsi_remove_device(sdev); | |
560 | scsi_device_put(sdev); | |
561 | } | |
562 | scsi_host_put(wrk->host); | |
563 | ||
564 | done: | |
565 | kfree(wrk); | |
566 | } | |
567 | ||
af9584b8 | 568 | |
a8c18c57 S |
569 | /* |
570 | * We can get incoming messages from the host that are not in response to | |
571 | * messages that we have sent out. An example of this would be messages | |
572 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
573 | * deal with potential race conditions where the driver may be in the | |
574 | * midst of being unloaded when we might receive an unsolicited message | |
575 | * from the host, we have implemented a mechanism to gurantee sequential | |
576 | * consistency: | |
577 | * | |
578 | * 1) Once the device is marked as being destroyed, we will fail all | |
579 | * outgoing messages. | |
580 | * 2) We permit incoming messages when the device is being destroyed, | |
581 | * only to properly account for messages already sent out. | |
582 | */ | |
583 | ||
f0d79fe9 S |
584 | static inline struct storvsc_device *get_out_stor_device( |
585 | struct hv_device *device) | |
586 | { | |
587 | struct storvsc_device *stor_device; | |
588 | ||
cd654ea1 | 589 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
590 | |
591 | if (stor_device && stor_device->destroy) | |
592 | stor_device = NULL; | |
593 | ||
594 | return stor_device; | |
595 | } | |
596 | ||
597 | ||
598 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
599 | { | |
600 | dev->drain_notify = true; | |
601 | wait_event(dev->waiting_to_drain, | |
602 | atomic_read(&dev->num_outstanding_req) == 0); | |
603 | dev->drain_notify = false; | |
604 | } | |
bef4a34a | 605 | |
8dcf37d4 S |
606 | static inline struct storvsc_device *get_in_stor_device( |
607 | struct hv_device *device) | |
608 | { | |
609 | struct storvsc_device *stor_device; | |
8dcf37d4 | 610 | |
cd654ea1 | 611 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
612 | |
613 | if (!stor_device) | |
614 | goto get_in_err; | |
615 | ||
616 | /* | |
617 | * If the device is being destroyed; allow incoming | |
618 | * traffic only to cleanup outstanding requests. | |
619 | */ | |
620 | ||
621 | if (stor_device->destroy && | |
622 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
623 | stor_device = NULL; | |
624 | ||
625 | get_in_err: | |
8dcf37d4 S |
626 | return stor_device; |
627 | ||
628 | } | |
629 | ||
6f94d5de S |
630 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
631 | { | |
632 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
633 | struct storvsc_device *stor_device; | |
634 | struct vmstorage_channel_properties props; | |
635 | ||
636 | stor_device = get_out_stor_device(device); | |
637 | if (!stor_device) | |
638 | return; | |
639 | ||
640 | if (stor_device->open_sub_channel == false) | |
641 | return; | |
642 | ||
643 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
644 | ||
645 | vmbus_open(new_sc, | |
646 | storvsc_ringbuffer_size, | |
647 | storvsc_ringbuffer_size, | |
648 | (void *)&props, | |
649 | sizeof(struct vmstorage_channel_properties), | |
650 | storvsc_on_channel_callback, new_sc); | |
d86adf48 S |
651 | |
652 | if (new_sc->state == CHANNEL_OPENED_STATE) { | |
653 | stor_device->stor_chns[new_sc->target_cpu] = new_sc; | |
654 | cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); | |
655 | } | |
6f94d5de S |
656 | } |
657 | ||
658 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
659 | { | |
660 | struct storvsc_device *stor_device; | |
661 | int num_cpus = num_online_cpus(); | |
662 | int num_sc; | |
663 | struct storvsc_cmd_request *request; | |
664 | struct vstor_packet *vstor_packet; | |
665 | int ret, t; | |
666 | ||
667 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
668 | stor_device = get_out_stor_device(device); | |
669 | if (!stor_device) | |
670 | return; | |
671 | ||
d86adf48 | 672 | stor_device->num_sc = num_sc; |
6f94d5de S |
673 | request = &stor_device->init_request; |
674 | vstor_packet = &request->vstor_packet; | |
675 | ||
676 | stor_device->open_sub_channel = true; | |
677 | /* | |
678 | * Establish a handler for dealing with subchannels. | |
679 | */ | |
680 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
681 | ||
682 | /* | |
683 | * Check to see if sub-channels have already been created. This | |
684 | * can happen when this driver is re-loaded after unloading. | |
685 | */ | |
686 | ||
687 | if (vmbus_are_subchannels_present(device->channel)) | |
688 | return; | |
689 | ||
690 | stor_device->open_sub_channel = false; | |
691 | /* | |
692 | * Request the host to create sub-channels. | |
693 | */ | |
694 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
695 | init_completion(&request->wait_event); | |
696 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
697 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
698 | vstor_packet->sub_channel_count = num_sc; | |
699 | ||
700 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
701 | (sizeof(struct vstor_packet) - | |
702 | vmscsi_size_delta), | |
703 | (unsigned long)request, | |
704 | VM_PKT_DATA_INBAND, | |
705 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
706 | ||
707 | if (ret != 0) | |
708 | return; | |
709 | ||
710 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
711 | if (t == 0) | |
712 | return; | |
713 | ||
714 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
715 | vstor_packet->status != 0) | |
716 | return; | |
717 | ||
718 | /* | |
719 | * Now that we created the sub-channels, invoke the check; this | |
720 | * may trigger the callback. | |
721 | */ | |
722 | stor_device->open_sub_channel = true; | |
723 | vmbus_are_subchannels_present(device->channel); | |
724 | } | |
725 | ||
dac58241 S |
726 | static void cache_wwn(struct storvsc_device *stor_device, |
727 | struct vstor_packet *vstor_packet) | |
728 | { | |
729 | /* | |
730 | * Cache the currently active port and node ww names. | |
731 | */ | |
732 | if (vstor_packet->wwn_packet.primary_active) { | |
733 | stor_device->node_name = | |
734 | wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); | |
735 | stor_device->port_name = | |
736 | wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); | |
737 | } else { | |
738 | stor_device->node_name = | |
739 | wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); | |
740 | stor_device->port_name = | |
741 | wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); | |
742 | } | |
743 | } | |
744 | ||
59635018 S |
745 | |
746 | static int storvsc_execute_vstor_op(struct hv_device *device, | |
747 | struct storvsc_cmd_request *request, | |
748 | bool status_check) | |
8dcf37d4 | 749 | { |
8dcf37d4 | 750 | struct vstor_packet *vstor_packet; |
59635018 | 751 | int ret, t; |
8dcf37d4 | 752 | |
8dcf37d4 S |
753 | vstor_packet = &request->vstor_packet; |
754 | ||
8dcf37d4 | 755 | init_completion(&request->wait_event); |
8dcf37d4 S |
756 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
757 | ||
758 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
759 | (sizeof(struct vstor_packet) - |
760 | vmscsi_size_delta), | |
8dcf37d4 S |
761 | (unsigned long)request, |
762 | VM_PKT_DATA_INBAND, | |
763 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
764 | if (ret != 0) | |
dac58241 | 765 | return ret; |
8dcf37d4 S |
766 | |
767 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
dac58241 S |
768 | if (t == 0) |
769 | return -ETIMEDOUT; | |
8dcf37d4 | 770 | |
59635018 S |
771 | if (!status_check) |
772 | return ret; | |
773 | ||
8dcf37d4 | 774 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
dac58241 S |
775 | vstor_packet->status != 0) |
776 | return -EINVAL; | |
8dcf37d4 | 777 | |
59635018 S |
778 | return ret; |
779 | } | |
780 | ||
781 | static int storvsc_channel_init(struct hv_device *device, bool is_fc) | |
782 | { | |
783 | struct storvsc_device *stor_device; | |
784 | struct storvsc_cmd_request *request; | |
785 | struct vstor_packet *vstor_packet; | |
786 | int ret, i; | |
787 | int max_chns; | |
788 | bool process_sub_channels = false; | |
789 | ||
790 | stor_device = get_out_stor_device(device); | |
791 | if (!stor_device) | |
792 | return -ENODEV; | |
793 | ||
794 | request = &stor_device->init_request; | |
795 | vstor_packet = &request->vstor_packet; | |
796 | ||
797 | /* | |
798 | * Now, initiate the vsc/vsp initialization protocol on the open | |
799 | * channel | |
800 | */ | |
801 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
802 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
803 | ret = storvsc_execute_vstor_op(device, request, true); | |
804 | if (ret) | |
805 | return ret; | |
806 | /* | |
807 | * Query host supported protocol version. | |
808 | */ | |
8dcf37d4 | 809 | |
1a363108 KM |
810 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
811 | /* reuse the packet for version range supported */ | |
812 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
813 | vstor_packet->operation = | |
814 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
8dcf37d4 | 815 | |
1a363108 KM |
816 | vstor_packet->version.major_minor = |
817 | vmstor_protocols[i].protocol_version; | |
85904a5e | 818 | |
1a363108 KM |
819 | /* |
820 | * The revision number is only used in Windows; set it to 0. | |
821 | */ | |
822 | vstor_packet->version.revision = 0; | |
59635018 | 823 | ret = storvsc_execute_vstor_op(device, request, false); |
1a363108 | 824 | if (ret != 0) |
dac58241 | 825 | return ret; |
8dcf37d4 | 826 | |
dac58241 S |
827 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
828 | return -EINVAL; | |
1a363108 KM |
829 | |
830 | if (vstor_packet->status == 0) { | |
831 | vmstor_proto_version = | |
832 | vmstor_protocols[i].protocol_version; | |
833 | ||
834 | sense_buffer_size = | |
835 | vmstor_protocols[i].sense_buffer_size; | |
836 | ||
837 | vmscsi_size_delta = | |
838 | vmstor_protocols[i].vmscsi_size_delta; | |
839 | ||
840 | break; | |
841 | } | |
8dcf37d4 S |
842 | } |
843 | ||
dac58241 S |
844 | if (vstor_packet->status != 0) |
845 | return -EINVAL; | |
8dcf37d4 S |
846 | |
847 | ||
848 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
849 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
59635018 | 850 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 851 | if (ret != 0) |
dac58241 | 852 | return ret; |
8dcf37d4 | 853 | |
6f94d5de S |
854 | /* |
855 | * Check to see if multi-channel support is there. | |
856 | * Hosts that implement protocol version of 5.1 and above | |
857 | * support multi-channel. | |
858 | */ | |
859 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
d86adf48 S |
860 | |
861 | /* | |
862 | * Allocate state to manage the sub-channels. | |
863 | * We allocate an array based on the numbers of possible CPUs | |
864 | * (Hyper-V does not support cpu online/offline). | |
865 | * This Array will be sparseley populated with unique | |
866 | * channels - primary + sub-channels. | |
867 | * We will however populate all the slots to evenly distribute | |
868 | * the load. | |
869 | */ | |
e0408528 | 870 | stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), |
d86adf48 S |
871 | GFP_KERNEL); |
872 | if (stor_device->stor_chns == NULL) | |
873 | return -ENOMEM; | |
874 | ||
875 | stor_device->stor_chns[device->channel->target_cpu] = device->channel; | |
876 | cpumask_set_cpu(device->channel->target_cpu, | |
877 | &stor_device->alloced_cpus); | |
878 | ||
e6c4bc66 | 879 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
6f94d5de S |
880 | if (vstor_packet->storage_channel_properties.flags & |
881 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
882 | process_sub_channels = true; | |
883 | } | |
5117b936 S |
884 | stor_device->max_transfer_bytes = |
885 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 886 | |
dac58241 S |
887 | if (!is_fc) |
888 | goto done; | |
889 | ||
59635018 S |
890 | /* |
891 | * For FC devices retrieve FC HBA data. | |
892 | */ | |
dac58241 S |
893 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
894 | vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; | |
59635018 | 895 | ret = storvsc_execute_vstor_op(device, request, true); |
dac58241 S |
896 | if (ret != 0) |
897 | return ret; | |
898 | ||
dac58241 S |
899 | /* |
900 | * Cache the currently active port and node ww names. | |
901 | */ | |
902 | cache_wwn(stor_device, vstor_packet); | |
903 | ||
904 | done: | |
905 | ||
8dcf37d4 S |
906 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
907 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
59635018 | 908 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 909 | if (ret != 0) |
dac58241 | 910 | return ret; |
8dcf37d4 | 911 | |
6f94d5de S |
912 | if (process_sub_channels) |
913 | handle_multichannel_storage(device, max_chns); | |
914 | ||
8dcf37d4 S |
915 | return ret; |
916 | } | |
917 | ||
c50bd448 S |
918 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
919 | struct scsi_cmnd *scmnd, | |
920 | struct Scsi_Host *host, | |
921 | u8 asc, u8 ascq) | |
922 | { | |
923 | struct storvsc_scan_work *wrk; | |
924 | void (*process_err_fn)(struct work_struct *work); | |
436ad941 | 925 | struct hv_host_device *host_dev = shost_priv(host); |
c50bd448 S |
926 | bool do_work = false; |
927 | ||
3209f9d7 | 928 | switch (SRB_STATUS(vm_srb->srb_status)) { |
c50bd448 | 929 | case SRB_STATUS_ERROR: |
bba5dc33 LL |
930 | /* |
931 | * Let upper layer deal with error when | |
932 | * sense message is present. | |
933 | */ | |
934 | ||
935 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) | |
936 | break; | |
c50bd448 S |
937 | /* |
938 | * If there is an error; offline the device since all | |
939 | * error recovery strategies would have already been | |
940 | * deployed on the host side. However, if the command | |
941 | * were a pass-through command deal with it appropriately. | |
942 | */ | |
943 | switch (scmnd->cmnd[0]) { | |
944 | case ATA_16: | |
945 | case ATA_12: | |
946 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
947 | break; | |
3533f860 S |
948 | /* |
949 | * On Some Windows hosts TEST_UNIT_READY command can return | |
950 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
951 | * based on the sense information. | |
952 | */ | |
953 | case TEST_UNIT_READY: | |
954 | break; | |
c50bd448 | 955 | default: |
d1b8b239 | 956 | set_host_byte(scmnd, DID_ERROR); |
c50bd448 S |
957 | } |
958 | break; | |
959 | case SRB_STATUS_INVALID_LUN: | |
d1b8b239 | 960 | set_host_byte(scmnd, DID_NO_CONNECT); |
c50bd448 S |
961 | do_work = true; |
962 | process_err_fn = storvsc_remove_lun; | |
963 | break; | |
ff06c5ff VK |
964 | case SRB_STATUS_ABORTED: |
965 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && | |
966 | (asc == 0x2a) && (ascq == 0x9)) { | |
6781209e S |
967 | do_work = true; |
968 | process_err_fn = storvsc_device_scan; | |
969 | /* | |
970 | * Retry the I/O that trigerred this. | |
971 | */ | |
972 | set_host_byte(scmnd, DID_REQUEUE); | |
973 | } | |
974 | break; | |
c50bd448 | 975 | } |
6781209e | 976 | |
c50bd448 S |
977 | if (!do_work) |
978 | return; | |
979 | ||
980 | /* | |
981 | * We need to schedule work to process this error; schedule it. | |
982 | */ | |
983 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
984 | if (!wrk) { | |
985 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
986 | return; | |
987 | } | |
988 | ||
989 | wrk->host = host; | |
990 | wrk->lun = vm_srb->lun; | |
98441221 | 991 | wrk->tgt_id = vm_srb->target_id; |
c50bd448 | 992 | INIT_WORK(&wrk->work, process_err_fn); |
436ad941 | 993 | queue_work(host_dev->handle_error_wq, &wrk->work); |
c50bd448 S |
994 | } |
995 | ||
2707388c | 996 | |
03996f20 S |
997 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
998 | struct storvsc_device *stor_dev) | |
8dcf37d4 | 999 | { |
2707388c | 1000 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
2707388c S |
1001 | struct scsi_sense_hdr sense_hdr; |
1002 | struct vmscsi_request *vm_srb; | |
40630f46 | 1003 | u32 data_transfer_length; |
c50bd448 | 1004 | struct Scsi_Host *host; |
be0cf6ca S |
1005 | u32 payload_sz = cmd_request->payload_sz; |
1006 | void *payload = cmd_request->payload; | |
c50bd448 | 1007 | |
c50bd448 | 1008 | host = stor_dev->host; |
8dcf37d4 | 1009 | |
61eaffc9 | 1010 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
40630f46 | 1011 | data_transfer_length = vm_srb->data_transfer_length; |
8dcf37d4 | 1012 | |
42e22cac S |
1013 | scmnd->result = vm_srb->scsi_status; |
1014 | ||
2707388c S |
1015 | if (scmnd->result) { |
1016 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
f8aea701 | 1017 | SCSI_SENSE_BUFFERSIZE, &sense_hdr) && |
84b342c0 CA |
1018 | !(sense_hdr.sense_key == NOT_READY && |
1019 | sense_hdr.asc == 0x03A) && | |
f8aea701 | 1020 | do_logging(STORVSC_LOGGING_ERROR)) |
d811b848 HR |
1021 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1022 | &sense_hdr); | |
2707388c S |
1023 | } |
1024 | ||
40630f46 | 1025 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { |
c50bd448 S |
1026 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
1027 | sense_hdr.ascq); | |
40630f46 LL |
1028 | /* |
1029 | * The Windows driver set data_transfer_length on | |
1030 | * SRB_STATUS_DATA_OVERRUN. On other errors, this value | |
1031 | * is untouched. In these cases we set it to 0. | |
1032 | */ | |
1033 | if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) | |
1034 | data_transfer_length = 0; | |
1035 | } | |
c50bd448 | 1036 | |
2707388c | 1037 | scsi_set_resid(scmnd, |
40630f46 | 1038 | cmd_request->payload->range.len - data_transfer_length); |
2707388c | 1039 | |
ead3700d | 1040 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
1041 | |
1042 | if (payload_sz > | |
1043 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1044 | kfree(payload); | |
2707388c S |
1045 | } |
1046 | ||
03996f20 | 1047 | static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
2707388c | 1048 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1049 | struct storvsc_cmd_request *request) |
2707388c | 1050 | { |
2707388c | 1051 | struct vstor_packet *stor_pkt; |
03996f20 | 1052 | struct hv_device *device = stor_device->device; |
2707388c | 1053 | |
2707388c S |
1054 | stor_pkt = &request->vstor_packet; |
1055 | ||
1056 | /* | |
1057 | * The current SCSI handling on the host side does | |
1058 | * not correctly handle: | |
1059 | * INQUIRY command with page code parameter set to 0x80 | |
1060 | * MODE_SENSE command with cmd[2] == 0x1c | |
1061 | * | |
1062 | * Setup srb and scsi status so this won't be fatal. | |
1063 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1064 | * (srb status == 0x4) and off-line the device in that case. |
1065 | */ | |
1066 | ||
1067 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1068 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1069 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1070 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1071 | } |
1072 | ||
8dcf37d4 S |
1073 | |
1074 | /* Copy over the status...etc */ | |
1075 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1076 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1077 | stor_pkt->vm_srb.sense_info_length = | |
1078 | vstor_packet->vm_srb.sense_info_length; | |
1079 | ||
f8aea701 LL |
1080 | if (vstor_packet->vm_srb.scsi_status != 0 || |
1081 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) | |
1082 | storvsc_log(device, STORVSC_LOGGING_WARN, | |
1083 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
1084 | stor_pkt->vm_srb.cdb[0], | |
1085 | vstor_packet->vm_srb.scsi_status, | |
1086 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
1087 | |
1088 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1089 | /* CHECK_CONDITION */ | |
16046320 S |
1090 | if (vstor_packet->vm_srb.srb_status & |
1091 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1092 | /* autosense data available */ |
8dcf37d4 | 1093 | |
f8aea701 LL |
1094 | storvsc_log(device, STORVSC_LOGGING_WARN, |
1095 | "stor pkt %p autosense data valid - len %d\n", | |
1096 | request, vstor_packet->vm_srb.sense_info_length); | |
1097 | ||
ead3700d | 1098 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1099 | vstor_packet->vm_srb.sense_data, |
1100 | vstor_packet->vm_srb.sense_info_length); | |
1101 | ||
1102 | } | |
1103 | } | |
1104 | ||
1105 | stor_pkt->vm_srb.data_transfer_length = | |
1106 | vstor_packet->vm_srb.data_transfer_length; | |
1107 | ||
03996f20 | 1108 | storvsc_command_completion(request, stor_device); |
8dcf37d4 S |
1109 | |
1110 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1111 | stor_device->drain_notify) | |
1112 | wake_up(&stor_device->waiting_to_drain); | |
1113 | ||
1114 | ||
1115 | } | |
1116 | ||
03996f20 | 1117 | static void storvsc_on_receive(struct storvsc_device *stor_device, |
8dcf37d4 | 1118 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1119 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1120 | { |
c58cc70f | 1121 | struct hv_host_device *host_dev; |
8dcf37d4 S |
1122 | switch (vstor_packet->operation) { |
1123 | case VSTOR_OPERATION_COMPLETE_IO: | |
03996f20 | 1124 | storvsc_on_io_completion(stor_device, vstor_packet, request); |
8dcf37d4 | 1125 | break; |
12675799 | 1126 | |
8dcf37d4 | 1127 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 | 1128 | case VSTOR_OPERATION_ENUMERATE_BUS: |
c58cc70f LL |
1129 | host_dev = shost_priv(stor_device->host); |
1130 | queue_work( | |
1131 | host_dev->handle_error_wq, &host_dev->host_scan_work); | |
12675799 | 1132 | break; |
8dcf37d4 | 1133 | |
dac58241 | 1134 | case VSTOR_OPERATION_FCHBA_DATA: |
dac58241 S |
1135 | cache_wwn(stor_device, vstor_packet); |
1136 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1137 | fc_host_node_name(stor_device->host) = stor_device->node_name; | |
1138 | fc_host_port_name(stor_device->host) = stor_device->port_name; | |
1139 | #endif | |
1140 | break; | |
8dcf37d4 S |
1141 | default: |
1142 | break; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | static void storvsc_on_channel_callback(void *context) | |
1147 | { | |
6f94d5de | 1148 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
ddccd952 | 1149 | const struct vmpacket_descriptor *desc; |
6f94d5de | 1150 | struct hv_device *device; |
8dcf37d4 | 1151 | struct storvsc_device *stor_device; |
8dcf37d4 | 1152 | |
6f94d5de S |
1153 | if (channel->primary_channel != NULL) |
1154 | device = channel->primary_channel->device_obj; | |
1155 | else | |
1156 | device = channel->device_obj; | |
8dcf37d4 S |
1157 | |
1158 | stor_device = get_in_stor_device(device); | |
1159 | if (!stor_device) | |
1160 | return; | |
1161 | ||
ddccd952 SH |
1162 | foreach_vmbus_pkt(desc, channel) { |
1163 | void *packet = hv_pkt_data(desc); | |
1164 | struct storvsc_cmd_request *request; | |
1165 | ||
1166 | request = (struct storvsc_cmd_request *) | |
1167 | ((unsigned long)desc->trans_id); | |
1168 | ||
1169 | if (request == &stor_device->init_request || | |
1170 | request == &stor_device->reset_request) { | |
1171 | memcpy(&request->vstor_packet, packet, | |
1172 | (sizeof(struct vstor_packet) - vmscsi_size_delta)); | |
1173 | complete(&request->wait_event); | |
8dcf37d4 | 1174 | } else { |
ddccd952 | 1175 | storvsc_on_receive(stor_device, packet, request); |
8dcf37d4 | 1176 | } |
ddccd952 | 1177 | } |
8dcf37d4 S |
1178 | } |
1179 | ||
dac58241 S |
1180 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
1181 | bool is_fc) | |
8dcf37d4 S |
1182 | { |
1183 | struct vmstorage_channel_properties props; | |
1184 | int ret; | |
1185 | ||
1186 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1187 | ||
8dcf37d4 S |
1188 | ret = vmbus_open(device->channel, |
1189 | ring_size, | |
1190 | ring_size, | |
1191 | (void *)&props, | |
1192 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1193 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1194 | |
1195 | if (ret != 0) | |
1196 | return ret; | |
1197 | ||
dac58241 | 1198 | ret = storvsc_channel_init(device, is_fc); |
8dcf37d4 S |
1199 | |
1200 | return ret; | |
1201 | } | |
1202 | ||
c1b3d067 | 1203 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1204 | { |
1205 | struct storvsc_device *stor_device; | |
8dcf37d4 | 1206 | |
cd654ea1 | 1207 | stor_device = hv_get_drvdata(device); |
8dcf37d4 | 1208 | |
8dcf37d4 | 1209 | stor_device->destroy = true; |
2371cd90 SH |
1210 | |
1211 | /* Make sure flag is set before waiting */ | |
1212 | wmb(); | |
8dcf37d4 S |
1213 | |
1214 | /* | |
1215 | * At this point, all outbound traffic should be disable. We | |
1216 | * only allow inbound traffic (responses) to proceed so that | |
1217 | * outstanding requests can be completed. | |
1218 | */ | |
1219 | ||
1220 | storvsc_wait_to_drain(stor_device); | |
1221 | ||
1222 | /* | |
1223 | * Since we have already drained, we don't need to busy wait | |
1224 | * as was done in final_release_stor_device() | |
1225 | * Note that we cannot set the ext pointer to NULL until | |
1226 | * we have drained - to drain the outgoing packets, we need to | |
1227 | * allow incoming packets. | |
1228 | */ | |
cd654ea1 | 1229 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1230 | |
1231 | /* Close the channel */ | |
1232 | vmbus_close(device->channel); | |
1233 | ||
d86adf48 | 1234 | kfree(stor_device->stor_chns); |
8dcf37d4 S |
1235 | kfree(stor_device); |
1236 | return 0; | |
1237 | } | |
1238 | ||
d86adf48 S |
1239 | static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
1240 | u16 q_num) | |
1241 | { | |
1242 | u16 slot = 0; | |
1243 | u16 hash_qnum; | |
1244 | struct cpumask alloced_mask; | |
1245 | int num_channels, tgt_cpu; | |
1246 | ||
1247 | if (stor_device->num_sc == 0) | |
1248 | return stor_device->device->channel; | |
1249 | ||
1250 | /* | |
1251 | * Our channel array is sparsley populated and we | |
1252 | * initiated I/O on a processor/hw-q that does not | |
1253 | * currently have a designated channel. Fix this. | |
1254 | * The strategy is simple: | |
1255 | * I. Ensure NUMA locality | |
1256 | * II. Distribute evenly (best effort) | |
1257 | * III. Mapping is persistent. | |
1258 | */ | |
1259 | ||
1260 | cpumask_and(&alloced_mask, &stor_device->alloced_cpus, | |
1261 | cpumask_of_node(cpu_to_node(q_num))); | |
1262 | ||
1263 | num_channels = cpumask_weight(&alloced_mask); | |
1264 | if (num_channels == 0) | |
1265 | return stor_device->device->channel; | |
1266 | ||
1267 | hash_qnum = q_num; | |
1268 | while (hash_qnum >= num_channels) | |
1269 | hash_qnum -= num_channels; | |
1270 | ||
1271 | for_each_cpu(tgt_cpu, &alloced_mask) { | |
1272 | if (slot == hash_qnum) | |
1273 | break; | |
1274 | slot++; | |
1275 | } | |
1276 | ||
1277 | stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; | |
1278 | ||
1279 | return stor_device->stor_chns[q_num]; | |
1280 | } | |
1281 | ||
1282 | ||
c1b3d067 | 1283 | static int storvsc_do_io(struct hv_device *device, |
d86adf48 | 1284 | struct storvsc_cmd_request *request, u16 q_num) |
8dcf37d4 S |
1285 | { |
1286 | struct storvsc_device *stor_device; | |
1287 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1288 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 | 1289 | int ret = 0; |
d86adf48 S |
1290 | struct cpumask alloced_mask; |
1291 | int tgt_cpu; | |
8dcf37d4 S |
1292 | |
1293 | vstor_packet = &request->vstor_packet; | |
1294 | stor_device = get_out_stor_device(device); | |
1295 | ||
1296 | if (!stor_device) | |
1297 | return -ENODEV; | |
1298 | ||
1299 | ||
1300 | request->device = device; | |
6f94d5de S |
1301 | /* |
1302 | * Select an an appropriate channel to send the request out. | |
1303 | */ | |
1304 | ||
d86adf48 S |
1305 | if (stor_device->stor_chns[q_num] != NULL) { |
1306 | outgoing_channel = stor_device->stor_chns[q_num]; | |
1307 | if (outgoing_channel->target_cpu == smp_processor_id()) { | |
1308 | /* | |
1309 | * Ideally, we want to pick a different channel if | |
1310 | * available on the same NUMA node. | |
1311 | */ | |
1312 | cpumask_and(&alloced_mask, &stor_device->alloced_cpus, | |
1313 | cpumask_of_node(cpu_to_node(q_num))); | |
9cfad4a5 MKE |
1314 | for_each_cpu_wrap(tgt_cpu, &alloced_mask, |
1315 | outgoing_channel->target_cpu + 1) { | |
d86adf48 S |
1316 | if (tgt_cpu != outgoing_channel->target_cpu) { |
1317 | outgoing_channel = | |
1318 | stor_device->stor_chns[tgt_cpu]; | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | } | |
1323 | } else { | |
1324 | outgoing_channel = get_og_chn(stor_device, q_num); | |
1325 | } | |
8dcf37d4 S |
1326 | |
1327 | ||
1328 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1329 | ||
8b612fa2 S |
1330 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1331 | vmscsi_size_delta); | |
8dcf37d4 S |
1332 | |
1333 | ||
8b612fa2 | 1334 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1335 | |
1336 | ||
1337 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1338 | request->payload->range.len; |
8dcf37d4 S |
1339 | |
1340 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1341 | ||
be0cf6ca S |
1342 | if (request->payload->range.len) { |
1343 | ||
1344 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1345 | request->payload, request->payload_sz, | |
8dcf37d4 | 1346 | vstor_packet, |
8b612fa2 S |
1347 | (sizeof(struct vstor_packet) - |
1348 | vmscsi_size_delta), | |
8dcf37d4 S |
1349 | (unsigned long)request); |
1350 | } else { | |
0147dabc | 1351 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 S |
1352 | (sizeof(struct vstor_packet) - |
1353 | vmscsi_size_delta), | |
8dcf37d4 S |
1354 | (unsigned long)request, |
1355 | VM_PKT_DATA_INBAND, | |
1356 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1357 | } | |
1358 | ||
1359 | if (ret != 0) | |
1360 | return ret; | |
1361 | ||
1362 | atomic_inc(&stor_device->num_outstanding_req); | |
1363 | ||
1364 | return ret; | |
1365 | } | |
1366 | ||
f1c635b4 SH |
1367 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1368 | { | |
1369 | /* | |
1370 | * Set blist flag to permit the reading of the VPD pages even when | |
1371 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1372 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1373 | * With this flag we can correctly handle WRITE_SAME_16 issues. | |
1374 | * | |
1375 | * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but | |
1376 | * still supports REPORT LUN. | |
1377 | */ | |
1378 | sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; | |
1379 | ||
1380 | return 0; | |
1381 | } | |
1382 | ||
419f2d03 S |
1383 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1384 | { | |
419f2d03 | 1385 | |
419f2d03 | 1386 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1387 | |
893def38 S |
1388 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1389 | ||
81988a0e VK |
1390 | /* Ensure there are no gaps in presented sgls */ |
1391 | blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); | |
1392 | ||
3e8f4f40 OH |
1393 | sdevice->no_write_same = 1; |
1394 | ||
b0a93d96 S |
1395 | /* |
1396 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1397 | * if the device is a MSFT virtual device. If the host is |
1398 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1399 | */ |
1400 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1401 | switch (vmstor_proto_version) { |
1402 | case VMSTOR_PROTO_VERSION_WIN8: | |
1403 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1404 | sdevice->scsi_level = SCSI_SPC_3; |
1405 | break; | |
1406 | } | |
b95f5be0 KM |
1407 | |
1408 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1409 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1410 | } |
1411 | ||
419f2d03 S |
1412 | return 0; |
1413 | } | |
1414 | ||
62838ce2 S |
1415 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1416 | sector_t capacity, int *info) | |
1417 | { | |
5326fd5c S |
1418 | sector_t nsect = capacity; |
1419 | sector_t cylinders = nsect; | |
1420 | int heads, sectors_pt; | |
62838ce2 | 1421 | |
5326fd5c S |
1422 | /* |
1423 | * We are making up these values; let us keep it simple. | |
1424 | */ | |
1425 | heads = 0xff; | |
1426 | sectors_pt = 0x3f; /* Sectors per track */ | |
1427 | sector_div(cylinders, heads * sectors_pt); | |
1428 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1429 | cylinders = 0xffff; | |
62838ce2 S |
1430 | |
1431 | info[0] = heads; | |
5326fd5c S |
1432 | info[1] = sectors_pt; |
1433 | info[2] = (int)cylinders; | |
62838ce2 | 1434 | |
62838ce2 S |
1435 | return 0; |
1436 | } | |
aa3d789e | 1437 | |
4b270c8b | 1438 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1439 | { |
4b270c8b S |
1440 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1441 | struct hv_device *device = host_dev->dev; | |
1442 | ||
aa3d789e | 1443 | struct storvsc_device *stor_device; |
61eaffc9 | 1444 | struct storvsc_cmd_request *request; |
aa3d789e S |
1445 | struct vstor_packet *vstor_packet; |
1446 | int ret, t; | |
1447 | ||
aa3d789e | 1448 | |
1eaaddf9 | 1449 | stor_device = get_out_stor_device(device); |
aa3d789e | 1450 | if (!stor_device) |
a00e8224 | 1451 | return FAILED; |
aa3d789e S |
1452 | |
1453 | request = &stor_device->reset_request; | |
1454 | vstor_packet = &request->vstor_packet; | |
1455 | ||
1456 | init_completion(&request->wait_event); | |
1457 | ||
1458 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1459 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1460 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1461 | ||
1462 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1463 | (sizeof(struct vstor_packet) - |
1464 | vmscsi_size_delta), | |
aa3d789e S |
1465 | (unsigned long)&stor_device->reset_request, |
1466 | VM_PKT_DATA_INBAND, | |
1467 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1468 | if (ret != 0) | |
a00e8224 | 1469 | return FAILED; |
aa3d789e | 1470 | |
46d2eb6d | 1471 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1472 | if (t == 0) |
1473 | return TIMEOUT_ERROR; | |
aa3d789e | 1474 | |
aa3d789e S |
1475 | |
1476 | /* | |
1477 | * At this point, all outstanding requests in the adapter | |
1478 | * should have been flushed out and return to us | |
5c1b10ab S |
1479 | * There is a potential race here where the host may be in |
1480 | * the process of responding when we return from here. | |
1481 | * Just wait for all in-transit packets to be accounted for | |
1482 | * before we return from here. | |
aa3d789e | 1483 | */ |
5c1b10ab | 1484 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1485 | |
a00e8224 | 1486 | return SUCCESS; |
aa3d789e S |
1487 | } |
1488 | ||
56b26e69 S |
1489 | /* |
1490 | * The host guarantees to respond to each command, although I/O latencies might | |
1491 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1492 | * chance to perform EH. | |
1493 | */ | |
1494 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1495 | { | |
3930d730 LL |
1496 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1497 | if (scmnd->device->host->transportt == fc_transport_template) | |
1498 | return fc_eh_timed_out(scmnd); | |
1499 | #endif | |
56b26e69 S |
1500 | return BLK_EH_RESET_TIMER; |
1501 | } | |
1502 | ||
c77b63b6 | 1503 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1504 | { |
1505 | bool allowed = true; | |
1506 | u8 scsi_op = scmnd->cmnd[0]; | |
1507 | ||
1508 | switch (scsi_op) { | |
3e8f4f40 OH |
1509 | /* the host does not handle WRITE_SAME, log accident usage */ |
1510 | case WRITE_SAME: | |
c77b63b6 S |
1511 | /* |
1512 | * smartd sends this command and the host does not handle | |
1513 | * this. So, don't send it. | |
1514 | */ | |
41098f8f | 1515 | case SET_WINDOW: |
59e00e74 | 1516 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1517 | allowed = false; |
1518 | break; | |
1519 | default: | |
1520 | break; | |
92ae4ebd OH |
1521 | } |
1522 | return allowed; | |
1523 | } | |
c5b463ae | 1524 | |
bab445e1 | 1525 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1526 | { |
1527 | int ret; | |
bab445e1 | 1528 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1529 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1530 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1531 | int i; |
1532 | struct scatterlist *sgl; | |
1533 | unsigned int sg_count = 0; | |
1534 | struct vmscsi_request *vm_srb; | |
aaced993 | 1535 | struct scatterlist *cur_sgl; |
be0cf6ca S |
1536 | struct vmbus_packet_mpb_array *payload; |
1537 | u32 payload_sz; | |
1538 | u32 length; | |
c5b463ae | 1539 | |
2492fd7a | 1540 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1541 | /* |
1542 | * On legacy hosts filter unimplemented commands. | |
1543 | * Future hosts are expected to correctly handle | |
1544 | * unsupported commands. Furthermore, it is | |
1545 | * possible that some of the currently | |
1546 | * unsupported commands maybe supported in | |
1547 | * future versions of the host. | |
1548 | */ | |
1549 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1550 | scmnd->scsi_done(scmnd); | |
1551 | return 0; | |
1552 | } | |
92ae4ebd | 1553 | } |
c5b463ae | 1554 | |
c5b463ae | 1555 | /* Setup the cmd request */ |
c5b463ae S |
1556 | cmd_request->cmd = scmnd; |
1557 | ||
61eaffc9 | 1558 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1559 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1560 | |
f885fb73 | 1561 | vm_srb->win8_extension.srb_flags |= |
8cf308e1 | 1562 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae | 1563 | |
3cd6d3d9 LL |
1564 | if (scmnd->device->tagged_supported) { |
1565 | vm_srb->win8_extension.srb_flags |= | |
1566 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); | |
1567 | vm_srb->win8_extension.queue_tag = SP_UNTAGGED; | |
1568 | vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; | |
1569 | } | |
1570 | ||
c5b463ae S |
1571 | /* Build the SRB */ |
1572 | switch (scmnd->sc_data_direction) { | |
1573 | case DMA_TO_DEVICE: | |
1574 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1575 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1576 | break; |
1577 | case DMA_FROM_DEVICE: | |
1578 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1579 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1580 | break; |
cb1cf080 | 1581 | case DMA_NONE: |
c5b463ae | 1582 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1583 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1584 | break; |
cb1cf080 VK |
1585 | default: |
1586 | /* | |
1587 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1588 | * supposed to see here. | |
1589 | */ | |
1590 | WARN(1, "Unexpected data direction: %d\n", | |
1591 | scmnd->sc_data_direction); | |
1592 | return -EINVAL; | |
c5b463ae S |
1593 | } |
1594 | ||
c5b463ae | 1595 | |
c5b463ae S |
1596 | vm_srb->port_number = host_dev->port; |
1597 | vm_srb->path_id = scmnd->device->channel; | |
1598 | vm_srb->target_id = scmnd->device->id; | |
1599 | vm_srb->lun = scmnd->device->lun; | |
1600 | ||
c5b463ae S |
1601 | vm_srb->cdb_length = scmnd->cmd_len; |
1602 | ||
1603 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1604 | ||
be0cf6ca S |
1605 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1606 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1607 | |
be0cf6ca S |
1608 | length = scsi_bufflen(scmnd); |
1609 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1610 | payload_sz = sizeof(cmd_request->mpb); | |
1611 | ||
1612 | if (sg_count) { | |
be0cf6ca S |
1613 | if (sg_count > MAX_PAGE_BUFFER_COUNT) { |
1614 | ||
b0120d99 | 1615 | payload_sz = (sg_count * sizeof(u64) + |
be0cf6ca | 1616 | sizeof(struct vmbus_packet_mpb_array)); |
b0120d99 | 1617 | payload = kzalloc(payload_sz, GFP_ATOMIC); |
81988a0e VK |
1618 | if (!payload) |
1619 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1620 | } |
1621 | ||
1622 | payload->range.len = length; | |
1623 | payload->range.offset = sgl[0].offset; | |
1624 | ||
aaced993 S |
1625 | cur_sgl = sgl; |
1626 | for (i = 0; i < sg_count; i++) { | |
be0cf6ca | 1627 | payload->range.pfn_array[i] = |
aaced993 S |
1628 | page_to_pfn(sg_page((cur_sgl))); |
1629 | cur_sgl = sg_next(cur_sgl); | |
1630 | } | |
c5b463ae S |
1631 | } |
1632 | ||
be0cf6ca S |
1633 | cmd_request->payload = payload; |
1634 | cmd_request->payload_sz = payload_sz; | |
1635 | ||
c5b463ae | 1636 | /* Invokes the vsc to start an IO */ |
d86adf48 S |
1637 | ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
1638 | put_cpu(); | |
636f0fd1 | 1639 | |
d2598f01 | 1640 | if (ret == -EAGAIN) { |
0208eeaa LL |
1641 | if (payload_sz > sizeof(cmd_request->mpb)) |
1642 | kfree(payload); | |
c5b463ae | 1643 | /* no more space */ |
ead3700d | 1644 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1645 | } |
1646 | ||
c77b63b6 | 1647 | return 0; |
c5b463ae S |
1648 | } |
1649 | ||
bef4a34a | 1650 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1651 | .module = THIS_MODULE, |
1652 | .name = "storvsc_host_t", | |
ead3700d | 1653 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1654 | .bios_param = storvsc_get_chs, |
1655 | .queuecommand = storvsc_queuecommand, | |
1656 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1657 | .proc_name = "storvsc_host", |
56b26e69 | 1658 | .eh_timed_out = storvsc_eh_timed_out, |
f1c635b4 | 1659 | .slave_alloc = storvsc_device_alloc, |
ff568d3a | 1660 | .slave_configure = storvsc_device_configure, |
cabe92a5 | 1661 | .cmd_per_lun = 2048, |
ff568d3a | 1662 | .this_id = -1, |
be0cf6ca | 1663 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1664 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1665 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1666 | .no_write_same = 1, |
f64dad26 | 1667 | .track_queue_depth = 1, |
bef4a34a HJ |
1668 | }; |
1669 | ||
ef52a81b S |
1670 | enum { |
1671 | SCSI_GUID, | |
1672 | IDE_GUID, | |
bde6d0f9 | 1673 | SFC_GUID, |
ef52a81b S |
1674 | }; |
1675 | ||
d847b5fe | 1676 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1677 | /* SCSI guid */ |
35c3bc20 S |
1678 | { HV_SCSI_GUID, |
1679 | .driver_data = SCSI_GUID | |
1680 | }, | |
21e37742 | 1681 | /* IDE guid */ |
35c3bc20 S |
1682 | { HV_IDE_GUID, |
1683 | .driver_data = IDE_GUID | |
1684 | }, | |
bde6d0f9 S |
1685 | /* Fibre Channel GUID */ |
1686 | { | |
1687 | HV_SYNTHFC_GUID, | |
1688 | .driver_data = SFC_GUID | |
1689 | }, | |
c45cf2d4 | 1690 | { }, |
d847b5fe | 1691 | }; |
bef4a34a | 1692 | |
d847b5fe | 1693 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1694 | |
84946899 S |
1695 | static int storvsc_probe(struct hv_device *device, |
1696 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1697 | { |
ff568d3a | 1698 | int ret; |
f458aada | 1699 | int num_cpus = num_online_cpus(); |
bef4a34a | 1700 | struct Scsi_Host *host; |
795b613d | 1701 | struct hv_host_device *host_dev; |
ef52a81b | 1702 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
dac58241 | 1703 | bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
bd1f5d6a | 1704 | int target = 0; |
6e4198ce | 1705 | struct storvsc_device *stor_device; |
0fb8db29 S |
1706 | int max_luns_per_target; |
1707 | int max_targets; | |
1708 | int max_channels; | |
f458aada | 1709 | int max_sub_channels = 0; |
bd1f5d6a | 1710 | |
8b612fa2 S |
1711 | /* |
1712 | * Based on the windows host we are running on, | |
1713 | * set state to properly communicate with the host. | |
1714 | */ | |
1715 | ||
6ee5c615 | 1716 | if (vmbus_proto_version < VERSION_WIN8) { |
0fb8db29 S |
1717 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1718 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1719 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1720 | } else { |
0fb8db29 S |
1721 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1722 | max_targets = STORVSC_MAX_TARGETS; | |
1723 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada | 1724 | /* |
f286299c LL |
1725 | * On Windows8 and above, we support sub-channels for storage |
1726 | * on SCSI and FC controllers. | |
f458aada S |
1727 | * The number of sub-channels offerred is based on the number of |
1728 | * VCPUs in the guest. | |
1729 | */ | |
f286299c LL |
1730 | if (!dev_is_ide) |
1731 | max_sub_channels = | |
1732 | (num_cpus - 1) / storvsc_vcpus_per_sub_channel; | |
8b612fa2 S |
1733 | } |
1734 | ||
f458aada S |
1735 | scsi_driver.can_queue = (max_outstanding_req_per_channel * |
1736 | (max_sub_channels + 1)); | |
1737 | ||
ff568d3a | 1738 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1739 | sizeof(struct hv_host_device)); |
f8feed06 | 1740 | if (!host) |
bef4a34a | 1741 | return -ENOMEM; |
bef4a34a | 1742 | |
7f33f30a | 1743 | host_dev = shost_priv(host); |
795b613d | 1744 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1745 | |
795b613d | 1746 | host_dev->port = host->host_no; |
97c15296 | 1747 | host_dev->dev = device; |
c58cc70f | 1748 | host_dev->host = host; |
bef4a34a | 1749 | |
4e03e697 | 1750 | |
a13d35ab | 1751 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1752 | if (!stor_device) { |
225ce6ea | 1753 | ret = -ENOMEM; |
ce3e301c | 1754 | goto err_out0; |
6e4198ce | 1755 | } |
9efd21e1 | 1756 | |
a13d35ab | 1757 | stor_device->destroy = false; |
6f94d5de | 1758 | stor_device->open_sub_channel = false; |
a13d35ab S |
1759 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1760 | stor_device->device = device; | |
cd654ea1 S |
1761 | stor_device->host = host; |
1762 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1763 | |
6e4198ce | 1764 | stor_device->port_number = host->host_no; |
dac58241 | 1765 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
225ce6ea | 1766 | if (ret) |
ce3e301c | 1767 | goto err_out1; |
bef4a34a | 1768 | |
6e4198ce S |
1769 | host_dev->path = stor_device->path_id; |
1770 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1771 | |
4cd83ecd S |
1772 | switch (dev_id->driver_data) { |
1773 | case SFC_GUID: | |
1774 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1775 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1776 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
dac58241 S |
1777 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1778 | host->transportt = fc_transport_template; | |
1779 | #endif | |
4cd83ecd S |
1780 | break; |
1781 | ||
1782 | case SCSI_GUID: | |
0fb8db29 S |
1783 | host->max_lun = max_luns_per_target; |
1784 | host->max_id = max_targets; | |
1785 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1786 | break; |
1787 | ||
1788 | default: | |
1789 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1790 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1791 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1792 | break; | |
1793 | } | |
cf55f4a8 MS |
1794 | /* max cmd length */ |
1795 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1796 | |
be0cf6ca S |
1797 | /* |
1798 | * set the table size based on the info we got | |
1799 | * from the host. | |
1800 | */ | |
1801 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
d86adf48 S |
1802 | /* |
1803 | * Set the number of HW queues we are supporting. | |
1804 | */ | |
1805 | if (stor_device->num_sc != 0) | |
1806 | host->nr_hw_queues = stor_device->num_sc + 1; | |
be0cf6ca | 1807 | |
436ad941 CA |
1808 | /* |
1809 | * Set the error handler work queue. | |
1810 | */ | |
1811 | host_dev->handle_error_wq = | |
1812 | alloc_ordered_workqueue("storvsc_error_wq_%d", | |
1813 | WQ_MEM_RECLAIM, | |
1814 | host->host_no); | |
1815 | if (!host_dev->handle_error_wq) | |
1816 | goto err_out2; | |
c58cc70f | 1817 | INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); |
454f18a9 | 1818 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1819 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1820 | if (ret != 0) |
436ad941 | 1821 | goto err_out3; |
bef4a34a | 1822 | |
bd1f5d6a S |
1823 | if (!dev_is_ide) { |
1824 | scsi_scan_host(host); | |
59d22950 S |
1825 | } else { |
1826 | target = (device->dev_instance.b[5] << 8 | | |
1827 | device->dev_instance.b[4]); | |
1828 | ret = scsi_add_device(host, 0, target, 0); | |
daf0cd44 | 1829 | if (ret) |
436ad941 | 1830 | goto err_out4; |
bef4a34a | 1831 | } |
dac58241 S |
1832 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1833 | if (host->transportt == fc_transport_template) { | |
daf0cd44 CA |
1834 | struct fc_rport_identifiers ids = { |
1835 | .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, | |
1836 | }; | |
1837 | ||
dac58241 S |
1838 | fc_host_node_name(host) = stor_device->node_name; |
1839 | fc_host_port_name(host) = stor_device->port_name; | |
daf0cd44 | 1840 | stor_device->rport = fc_remote_port_add(host, 0, &ids); |
ca8dc694 DC |
1841 | if (!stor_device->rport) { |
1842 | ret = -ENOMEM; | |
436ad941 | 1843 | goto err_out4; |
ca8dc694 | 1844 | } |
dac58241 S |
1845 | } |
1846 | #endif | |
bd1f5d6a | 1847 | return 0; |
bef4a34a | 1848 | |
436ad941 | 1849 | err_out4: |
daf0cd44 CA |
1850 | scsi_remove_host(host); |
1851 | ||
436ad941 CA |
1852 | err_out3: |
1853 | destroy_workqueue(host_dev->handle_error_wq); | |
1854 | ||
ce3e301c | 1855 | err_out2: |
225ce6ea S |
1856 | /* |
1857 | * Once we have connected with the host, we would need to | |
1858 | * to invoke storvsc_dev_remove() to rollback this state and | |
1859 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1860 | * err_out1 label. |
225ce6ea | 1861 | */ |
bd1f5d6a | 1862 | storvsc_dev_remove(device); |
ce3e301c | 1863 | goto err_out0; |
225ce6ea S |
1864 | |
1865 | err_out1: | |
d86adf48 | 1866 | kfree(stor_device->stor_chns); |
ce3e301c | 1867 | kfree(stor_device); |
225ce6ea S |
1868 | |
1869 | err_out0: | |
bd1f5d6a | 1870 | scsi_host_put(host); |
225ce6ea | 1871 | return ret; |
bef4a34a HJ |
1872 | } |
1873 | ||
ddcbf65e S |
1874 | static int storvsc_remove(struct hv_device *dev) |
1875 | { | |
1876 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1877 | struct Scsi_Host *host = stor_device->host; | |
436ad941 | 1878 | struct hv_host_device *host_dev = shost_priv(host); |
ddcbf65e | 1879 | |
dac58241 | 1880 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
daf0cd44 CA |
1881 | if (host->transportt == fc_transport_template) { |
1882 | fc_remote_port_delete(stor_device->rport); | |
dac58241 | 1883 | fc_remove_host(host); |
daf0cd44 | 1884 | } |
dac58241 | 1885 | #endif |
436ad941 | 1886 | destroy_workqueue(host_dev->handle_error_wq); |
ddcbf65e S |
1887 | scsi_remove_host(host); |
1888 | storvsc_dev_remove(dev); | |
1889 | scsi_host_put(host); | |
1890 | ||
1891 | return 0; | |
1892 | } | |
1893 | ||
40bf63ed | 1894 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1895 | .name = KBUILD_MODNAME, |
d847b5fe | 1896 | .id_table = id_table, |
40bf63ed S |
1897 | .probe = storvsc_probe, |
1898 | .remove = storvsc_remove, | |
39ae6fae | 1899 | }; |
7bd05b91 | 1900 | |
dac58241 S |
1901 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1902 | static struct fc_function_template fc_transport_functions = { | |
1903 | .show_host_node_name = 1, | |
1904 | .show_host_port_name = 1, | |
1905 | }; | |
1906 | #endif | |
1907 | ||
d9bbae83 | 1908 | static int __init storvsc_drv_init(void) |
f5c78872 | 1909 | { |
dac58241 | 1910 | int ret; |
01415ab3 S |
1911 | |
1912 | /* | |
1913 | * Divide the ring buffer data size (which is 1 page less | |
1914 | * than the ring buffer size since that page is reserved for | |
1915 | * the ring buffer indices) by the max request size (which is | |
1916 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1917 | */ | |
01415ab3 | 1918 | max_outstanding_req_per_channel = |
768fa219 GKH |
1919 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1920 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1921 | sizeof(struct vstor_packet) + sizeof(u64) - |
1922 | vmscsi_size_delta, | |
768fa219 | 1923 | sizeof(u64))); |
f5c78872 | 1924 | |
dac58241 S |
1925 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1926 | fc_transport_template = fc_attach_transport(&fc_transport_functions); | |
1927 | if (!fc_transport_template) | |
1928 | return -ENODEV; | |
1929 | #endif | |
1930 | ||
1931 | ret = vmbus_driver_register(&storvsc_drv); | |
1932 | ||
1933 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1934 | if (ret) | |
1935 | fc_release_transport(fc_transport_template); | |
1936 | #endif | |
1937 | ||
1938 | return ret; | |
f5c78872 S |
1939 | } |
1940 | ||
c63ba9e1 | 1941 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1942 | { |
768fa219 | 1943 | vmbus_driver_unregister(&storvsc_drv); |
dac58241 S |
1944 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1945 | fc_release_transport(fc_transport_template); | |
1946 | #endif | |
f5c78872 S |
1947 | } |
1948 | ||
ff568d3a | 1949 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1950 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1951 | module_init(storvsc_drv_init); |
c63ba9e1 | 1952 | module_exit(storvsc_drv_exit); |