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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 | |
154 | * variable to track the size we should use. | |
155 | */ | |
156 | static int sense_buffer_size; | |
157 | ||
158 | /* | |
159 | * The size of the vmscsi_request has changed in win8. The | |
160 | * additional size is because of new elements added to the | |
161 | * structure. These elements are valid only when we are talking | |
162 | * to a win8 host. | |
163 | * Track the correction to size we need to apply. | |
164 | */ | |
165 | ||
166 | static int vmscsi_size_delta; | |
2492fd7a | 167 | static int vmstor_proto_version; |
8b612fa2 S |
168 | |
169 | struct vmscsi_win8_extension { | |
170 | /* | |
171 | * The following were added in Windows 8 | |
172 | */ | |
173 | u16 reserve; | |
174 | u8 queue_tag; | |
175 | u8 queue_action; | |
176 | u32 srb_flags; | |
177 | u32 time_out_value; | |
178 | u32 queue_sort_ey; | |
179 | } __packed; | |
180 | ||
f0d79fe9 | 181 | struct vmscsi_request { |
c649114a S |
182 | u16 length; |
183 | u8 srb_status; | |
184 | u8 scsi_status; | |
f0d79fe9 | 185 | |
c649114a S |
186 | u8 port_number; |
187 | u8 path_id; | |
188 | u8 target_id; | |
189 | u8 lun; | |
f0d79fe9 | 190 | |
c649114a S |
191 | u8 cdb_length; |
192 | u8 sense_info_length; | |
193 | u8 data_in; | |
194 | u8 reserved; | |
f0d79fe9 | 195 | |
c649114a | 196 | u32 data_transfer_length; |
f0d79fe9 S |
197 | |
198 | union { | |
6b2f9495 S |
199 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
200 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
201 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 202 | }; |
8b612fa2 S |
203 | /* |
204 | * The following was added in win8. | |
205 | */ | |
206 | struct vmscsi_win8_extension win8_extension; | |
207 | ||
f0d79fe9 S |
208 | } __attribute((packed)); |
209 | ||
210 | ||
1a363108 KM |
211 | /* |
212 | * The list of storage protocols in order of preference. | |
213 | */ | |
214 | struct vmstor_protocol { | |
215 | int protocol_version; | |
216 | int sense_buffer_size; | |
217 | int vmscsi_size_delta; | |
218 | }; | |
219 | ||
220 | ||
221 | static const struct vmstor_protocol vmstor_protocols[] = { | |
222 | { | |
223 | VMSTOR_PROTO_VERSION_WIN10, | |
224 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
225 | 0 | |
226 | }, | |
227 | { | |
228 | VMSTOR_PROTO_VERSION_WIN8_1, | |
229 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
230 | 0 | |
231 | }, | |
232 | { | |
233 | VMSTOR_PROTO_VERSION_WIN8, | |
234 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
235 | 0 | |
236 | }, | |
237 | { | |
238 | VMSTOR_PROTO_VERSION_WIN7, | |
239 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
240 | sizeof(struct vmscsi_win8_extension), | |
241 | }, | |
242 | { | |
243 | VMSTOR_PROTO_VERSION_WIN6, | |
244 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
245 | sizeof(struct vmscsi_win8_extension), | |
246 | } | |
247 | }; | |
248 | ||
249 | ||
f0d79fe9 S |
250 | /* |
251 | * This structure is sent during the intialization phase to get the different | |
252 | * properties of the channel. | |
253 | */ | |
8b612fa2 S |
254 | |
255 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
256 | ||
f0d79fe9 | 257 | struct vmstorage_channel_properties { |
8b612fa2 S |
258 | u32 reserved; |
259 | u16 max_channel_cnt; | |
260 | u16 reserved1; | |
f0d79fe9 | 261 | |
8b612fa2 | 262 | u32 flags; |
c649114a | 263 | u32 max_transfer_bytes; |
f0d79fe9 | 264 | |
8b612fa2 | 265 | u64 reserved2; |
f0d79fe9 S |
266 | } __packed; |
267 | ||
268 | /* This structure is sent during the storage protocol negotiations. */ | |
269 | struct vmstorage_protocol_version { | |
270 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 271 | u16 major_minor; |
f0d79fe9 S |
272 | |
273 | /* | |
274 | * Revision number is auto-incremented whenever this file is changed | |
275 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
276 | * definitely indicate incompatibility--but it does indicate mismatched | |
277 | * builds. | |
c649114a | 278 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 279 | */ |
85904a5e | 280 | u16 revision; |
f0d79fe9 S |
281 | } __packed; |
282 | ||
283 | /* Channel Property Flags */ | |
284 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
285 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
286 | ||
287 | struct vstor_packet { | |
288 | /* Requested operation type */ | |
289 | enum vstor_packet_operation operation; | |
290 | ||
291 | /* Flags - see below for values */ | |
c649114a | 292 | u32 flags; |
f0d79fe9 S |
293 | |
294 | /* Status of the request returned from the server side. */ | |
c649114a | 295 | u32 status; |
f0d79fe9 S |
296 | |
297 | /* Data payload area */ | |
298 | union { | |
299 | /* | |
300 | * Structure used to forward SCSI commands from the | |
301 | * client to the server. | |
302 | */ | |
303 | struct vmscsi_request vm_srb; | |
304 | ||
305 | /* Structure used to query channel properties. */ | |
306 | struct vmstorage_channel_properties storage_channel_properties; | |
307 | ||
308 | /* Used during version negotiations. */ | |
309 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
310 | |
311 | /* Fibre channel address packet */ | |
312 | struct hv_fc_wwn_packet wwn_packet; | |
313 | ||
314 | /* Number of sub-channels to create */ | |
315 | u16 sub_channel_count; | |
316 | ||
317 | /* This will be the maximum of the union members */ | |
318 | u8 buffer[0x34]; | |
f0d79fe9 S |
319 | }; |
320 | } __packed; | |
321 | ||
f0d79fe9 | 322 | /* |
09f0355f S |
323 | * Packet Flags: |
324 | * | |
f0d79fe9 S |
325 | * This flag indicates that the server should send back a completion for this |
326 | * packet. | |
327 | */ | |
09f0355f | 328 | |
f0d79fe9 S |
329 | #define REQUEST_COMPLETION_FLAG 0x1 |
330 | ||
f0d79fe9 S |
331 | /* Matches Windows-end */ |
332 | enum storvsc_request_type { | |
c649114a | 333 | WRITE_TYPE = 0, |
f0d79fe9 S |
334 | READ_TYPE, |
335 | UNKNOWN_TYPE, | |
336 | }; | |
337 | ||
16046320 S |
338 | /* |
339 | * SRB status codes and masks; a subset of the codes used here. | |
340 | */ | |
341 | ||
342 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
343 | #define SRB_STATUS_INVALID_LUN 0x20 | |
344 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 345 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
346 | #define SRB_STATUS_ERROR 0x04 |
347 | ||
af9584b8 S |
348 | /* |
349 | * This is the end of Protocol specific defines. | |
350 | */ | |
351 | ||
b9ec3a55 | 352 | static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
f458aada S |
353 | static u32 max_outstanding_req_per_channel; |
354 | ||
355 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
356 | |
357 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
358 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
359 | ||
f458aada S |
360 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
361 | MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); | |
893def38 S |
362 | /* |
363 | * Timeout in seconds for all devices managed by this driver. | |
364 | */ | |
365 | static int storvsc_timeout = 180; | |
366 | ||
f3cfabce S |
367 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
368 | ||
af9584b8 | 369 | |
6f94d5de S |
370 | static void storvsc_on_channel_callback(void *context); |
371 | ||
4cd83ecd S |
372 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
373 | #define STORVSC_MAX_TARGETS 2 | |
374 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 375 | |
4cd83ecd S |
376 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
377 | #define STORVSC_FC_MAX_TARGETS 128 | |
378 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 379 | |
4cd83ecd S |
380 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
381 | #define STORVSC_IDE_MAX_TARGETS 1 | |
382 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 383 | |
61eaffc9 | 384 | struct storvsc_cmd_request { |
61eaffc9 S |
385 | struct scsi_cmnd *cmd; |
386 | ||
387 | unsigned int bounce_sgl_count; | |
388 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 389 | |
f0d79fe9 S |
390 | struct hv_device *device; |
391 | ||
392 | /* Synchronize the request/response if needed */ | |
393 | struct completion wait_event; | |
394 | ||
be0cf6ca S |
395 | struct vmbus_channel_packet_multipage_buffer mpb; |
396 | struct vmbus_packet_mpb_array *payload; | |
397 | u32 payload_sz; | |
398 | ||
f0d79fe9 S |
399 | struct vstor_packet vstor_packet; |
400 | }; | |
401 | ||
402 | ||
f0d79fe9 S |
403 | /* A storvsc device is a device object that contains a vmbus channel */ |
404 | struct storvsc_device { | |
405 | struct hv_device *device; | |
406 | ||
407 | bool destroy; | |
408 | bool drain_notify; | |
6f94d5de | 409 | bool open_sub_channel; |
f0d79fe9 | 410 | atomic_t num_outstanding_req; |
cd654ea1 | 411 | struct Scsi_Host *host; |
f0d79fe9 S |
412 | |
413 | wait_queue_head_t waiting_to_drain; | |
414 | ||
415 | /* | |
416 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
417 | * controller. In reality, the pathid, targetid is always 0 | |
418 | * and the port is set by us | |
419 | */ | |
420 | unsigned int port_number; | |
421 | unsigned char path_id; | |
422 | unsigned char target_id; | |
423 | ||
5117b936 S |
424 | /* |
425 | * Max I/O, the device can support. | |
426 | */ | |
427 | u32 max_transfer_bytes; | |
f0d79fe9 | 428 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
429 | struct storvsc_cmd_request init_request; |
430 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
431 | }; |
432 | ||
ce3e301c S |
433 | struct hv_host_device { |
434 | struct hv_device *dev; | |
c1b3d067 S |
435 | unsigned int port; |
436 | unsigned char path; | |
437 | unsigned char target; | |
438 | }; | |
439 | ||
12675799 S |
440 | struct storvsc_scan_work { |
441 | struct work_struct work; | |
442 | struct Scsi_Host *host; | |
443 | uint lun; | |
444 | }; | |
445 | ||
6781209e S |
446 | static void storvsc_device_scan(struct work_struct *work) |
447 | { | |
448 | struct storvsc_scan_work *wrk; | |
449 | uint lun; | |
450 | struct scsi_device *sdev; | |
451 | ||
452 | wrk = container_of(work, struct storvsc_scan_work, work); | |
453 | lun = wrk->lun; | |
454 | ||
455 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
456 | if (!sdev) | |
457 | goto done; | |
458 | scsi_rescan_device(&sdev->sdev_gendev); | |
459 | scsi_device_put(sdev); | |
460 | ||
461 | done: | |
462 | kfree(wrk); | |
463 | } | |
464 | ||
2a09ed3d | 465 | static void storvsc_host_scan(struct work_struct *work) |
12675799 S |
466 | { |
467 | struct storvsc_scan_work *wrk; | |
2a09ed3d | 468 | struct Scsi_Host *host; |
34a716bc | 469 | struct scsi_device *sdev; |
12675799 S |
470 | |
471 | wrk = container_of(work, struct storvsc_scan_work, work); | |
2a09ed3d S |
472 | host = wrk->host; |
473 | ||
34a716bc S |
474 | /* |
475 | * Before scanning the host, first check to see if any of the | |
476 | * currrently known devices have been hot removed. We issue a | |
477 | * "unit ready" command against all currently known devices. | |
478 | * This I/O will result in an error for devices that have been | |
479 | * removed. As part of handling the I/O error, we remove the device. | |
480 | * | |
481 | * When a LUN is added or removed, the host sends us a signal to | |
482 | * scan the host. Thus we are forced to discover the LUNs that | |
483 | * may have been removed this way. | |
484 | */ | |
485 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 486 | shost_for_each_device(sdev, host) |
34a716bc | 487 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
488 | mutex_unlock(&host->scan_mutex); |
489 | /* | |
490 | * Now scan the host to discover LUNs that may have been added. | |
491 | */ | |
2a09ed3d S |
492 | scsi_scan_host(host); |
493 | ||
12675799 S |
494 | kfree(wrk); |
495 | } | |
496 | ||
b4017319 S |
497 | static void storvsc_remove_lun(struct work_struct *work) |
498 | { | |
499 | struct storvsc_scan_work *wrk; | |
500 | struct scsi_device *sdev; | |
501 | ||
502 | wrk = container_of(work, struct storvsc_scan_work, work); | |
503 | if (!scsi_host_get(wrk->host)) | |
504 | goto done; | |
505 | ||
506 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
507 | ||
508 | if (sdev) { | |
509 | scsi_remove_device(sdev); | |
510 | scsi_device_put(sdev); | |
511 | } | |
512 | scsi_host_put(wrk->host); | |
513 | ||
514 | done: | |
515 | kfree(wrk); | |
516 | } | |
517 | ||
af9584b8 | 518 | |
a8c18c57 S |
519 | /* |
520 | * We can get incoming messages from the host that are not in response to | |
521 | * messages that we have sent out. An example of this would be messages | |
522 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
523 | * deal with potential race conditions where the driver may be in the | |
524 | * midst of being unloaded when we might receive an unsolicited message | |
525 | * from the host, we have implemented a mechanism to gurantee sequential | |
526 | * consistency: | |
527 | * | |
528 | * 1) Once the device is marked as being destroyed, we will fail all | |
529 | * outgoing messages. | |
530 | * 2) We permit incoming messages when the device is being destroyed, | |
531 | * only to properly account for messages already sent out. | |
532 | */ | |
533 | ||
f0d79fe9 S |
534 | static inline struct storvsc_device *get_out_stor_device( |
535 | struct hv_device *device) | |
536 | { | |
537 | struct storvsc_device *stor_device; | |
538 | ||
cd654ea1 | 539 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
540 | |
541 | if (stor_device && stor_device->destroy) | |
542 | stor_device = NULL; | |
543 | ||
544 | return stor_device; | |
545 | } | |
546 | ||
547 | ||
548 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
549 | { | |
550 | dev->drain_notify = true; | |
551 | wait_event(dev->waiting_to_drain, | |
552 | atomic_read(&dev->num_outstanding_req) == 0); | |
553 | dev->drain_notify = false; | |
554 | } | |
bef4a34a | 555 | |
8dcf37d4 S |
556 | static inline struct storvsc_device *get_in_stor_device( |
557 | struct hv_device *device) | |
558 | { | |
559 | struct storvsc_device *stor_device; | |
8dcf37d4 | 560 | |
cd654ea1 | 561 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
562 | |
563 | if (!stor_device) | |
564 | goto get_in_err; | |
565 | ||
566 | /* | |
567 | * If the device is being destroyed; allow incoming | |
568 | * traffic only to cleanup outstanding requests. | |
569 | */ | |
570 | ||
571 | if (stor_device->destroy && | |
572 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
573 | stor_device = NULL; | |
574 | ||
575 | get_in_err: | |
8dcf37d4 S |
576 | return stor_device; |
577 | ||
578 | } | |
579 | ||
2707388c S |
580 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
581 | unsigned int sg_count) | |
582 | { | |
583 | int i; | |
584 | struct page *page_buf; | |
585 | ||
586 | for (i = 0; i < sg_count; i++) { | |
587 | page_buf = sg_page((&sgl[i])); | |
588 | if (page_buf != NULL) | |
589 | __free_page(page_buf); | |
590 | } | |
591 | ||
592 | kfree(sgl); | |
593 | } | |
594 | ||
595 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
596 | { | |
597 | int i; | |
598 | ||
599 | /* No need to check */ | |
600 | if (sg_count < 2) | |
601 | return -1; | |
602 | ||
603 | /* We have at least 2 sg entries */ | |
604 | for (i = 0; i < sg_count; i++) { | |
605 | if (i == 0) { | |
606 | /* make sure 1st one does not have hole */ | |
607 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
608 | return i; | |
609 | } else if (i == sg_count - 1) { | |
610 | /* make sure last one does not have hole */ | |
611 | if (sgl[i].offset != 0) | |
612 | return i; | |
613 | } else { | |
614 | /* make sure no hole in the middle */ | |
615 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
616 | return i; | |
617 | } | |
618 | } | |
619 | return -1; | |
620 | } | |
621 | ||
622 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
623 | unsigned int sg_count, | |
624 | unsigned int len, | |
625 | int write) | |
626 | { | |
627 | int i; | |
628 | int num_pages; | |
629 | struct scatterlist *bounce_sgl; | |
630 | struct page *page_buf; | |
631 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
632 | ||
633 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
634 | ||
635 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
636 | if (!bounce_sgl) | |
637 | return NULL; | |
638 | ||
9d2696e6 | 639 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
640 | for (i = 0; i < num_pages; i++) { |
641 | page_buf = alloc_page(GFP_ATOMIC); | |
642 | if (!page_buf) | |
643 | goto cleanup; | |
644 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
645 | } | |
646 | ||
647 | return bounce_sgl; | |
648 | ||
649 | cleanup: | |
650 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | /* Assume the original sgl has enough room */ | |
655 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
656 | struct scatterlist *bounce_sgl, | |
657 | unsigned int orig_sgl_count, | |
658 | unsigned int bounce_sgl_count) | |
659 | { | |
660 | int i; | |
661 | int j = 0; | |
662 | unsigned long src, dest; | |
663 | unsigned int srclen, destlen, copylen; | |
664 | unsigned int total_copied = 0; | |
665 | unsigned long bounce_addr = 0; | |
666 | unsigned long dest_addr = 0; | |
667 | unsigned long flags; | |
aaced993 S |
668 | struct scatterlist *cur_dest_sgl; |
669 | struct scatterlist *cur_src_sgl; | |
2707388c S |
670 | |
671 | local_irq_save(flags); | |
aaced993 S |
672 | cur_dest_sgl = orig_sgl; |
673 | cur_src_sgl = bounce_sgl; | |
2707388c | 674 | for (i = 0; i < orig_sgl_count; i++) { |
aaced993 S |
675 | dest_addr = (unsigned long) |
676 | kmap_atomic(sg_page(cur_dest_sgl)) + | |
677 | cur_dest_sgl->offset; | |
2707388c | 678 | dest = dest_addr; |
aaced993 | 679 | destlen = cur_dest_sgl->length; |
2707388c S |
680 | |
681 | if (bounce_addr == 0) | |
aaced993 S |
682 | bounce_addr = (unsigned long)kmap_atomic( |
683 | sg_page(cur_src_sgl)); | |
2707388c S |
684 | |
685 | while (destlen) { | |
aaced993 S |
686 | src = bounce_addr + cur_src_sgl->offset; |
687 | srclen = cur_src_sgl->length - cur_src_sgl->offset; | |
2707388c S |
688 | |
689 | copylen = min(srclen, destlen); | |
690 | memcpy((void *)dest, (void *)src, copylen); | |
691 | ||
692 | total_copied += copylen; | |
aaced993 | 693 | cur_src_sgl->offset += copylen; |
2707388c S |
694 | destlen -= copylen; |
695 | dest += copylen; | |
696 | ||
aaced993 | 697 | if (cur_src_sgl->offset == cur_src_sgl->length) { |
2707388c | 698 | /* full */ |
aaced993 | 699 | kunmap_atomic((void *)bounce_addr); |
2707388c S |
700 | j++; |
701 | ||
702 | /* | |
703 | * It is possible that the number of elements | |
704 | * in the bounce buffer may not be equal to | |
705 | * the number of elements in the original | |
706 | * scatter list. Handle this correctly. | |
707 | */ | |
708 | ||
709 | if (j == bounce_sgl_count) { | |
710 | /* | |
711 | * We are done; cleanup and return. | |
712 | */ | |
aaced993 S |
713 | kunmap_atomic((void *)(dest_addr - |
714 | cur_dest_sgl->offset)); | |
2707388c S |
715 | local_irq_restore(flags); |
716 | return total_copied; | |
717 | } | |
718 | ||
719 | /* if we need to use another bounce buffer */ | |
aaced993 S |
720 | if (destlen || i != orig_sgl_count - 1) { |
721 | cur_src_sgl = sg_next(cur_src_sgl); | |
722 | bounce_addr = (unsigned long) | |
723 | kmap_atomic( | |
724 | sg_page(cur_src_sgl)); | |
725 | } | |
2707388c S |
726 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
727 | /* unmap the last bounce that is < PAGE_SIZE */ | |
aaced993 | 728 | kunmap_atomic((void *)bounce_addr); |
2707388c S |
729 | } |
730 | } | |
731 | ||
aaced993 S |
732 | kunmap_atomic((void *)(dest_addr - cur_dest_sgl->offset)); |
733 | cur_dest_sgl = sg_next(cur_dest_sgl); | |
2707388c S |
734 | } |
735 | ||
736 | local_irq_restore(flags); | |
737 | ||
738 | return total_copied; | |
739 | } | |
740 | ||
741 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
742 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
743 | struct scatterlist *bounce_sgl, | |
744 | unsigned int orig_sgl_count) | |
745 | { | |
746 | int i; | |
747 | int j = 0; | |
748 | unsigned long src, dest; | |
749 | unsigned int srclen, destlen, copylen; | |
750 | unsigned int total_copied = 0; | |
751 | unsigned long bounce_addr = 0; | |
752 | unsigned long src_addr = 0; | |
753 | unsigned long flags; | |
aaced993 S |
754 | struct scatterlist *cur_src_sgl; |
755 | struct scatterlist *cur_dest_sgl; | |
2707388c S |
756 | |
757 | local_irq_save(flags); | |
758 | ||
aaced993 S |
759 | cur_src_sgl = orig_sgl; |
760 | cur_dest_sgl = bounce_sgl; | |
761 | ||
2707388c | 762 | for (i = 0; i < orig_sgl_count; i++) { |
aaced993 S |
763 | src_addr = (unsigned long) |
764 | kmap_atomic(sg_page(cur_src_sgl)) + | |
765 | cur_src_sgl->offset; | |
2707388c | 766 | src = src_addr; |
aaced993 | 767 | srclen = cur_src_sgl->length; |
2707388c S |
768 | |
769 | if (bounce_addr == 0) | |
aaced993 S |
770 | bounce_addr = (unsigned long) |
771 | kmap_atomic(sg_page(cur_dest_sgl)); | |
2707388c S |
772 | |
773 | while (srclen) { | |
774 | /* assume bounce offset always == 0 */ | |
aaced993 S |
775 | dest = bounce_addr + cur_dest_sgl->length; |
776 | destlen = PAGE_SIZE - cur_dest_sgl->length; | |
2707388c S |
777 | |
778 | copylen = min(srclen, destlen); | |
779 | memcpy((void *)dest, (void *)src, copylen); | |
780 | ||
781 | total_copied += copylen; | |
aaced993 | 782 | cur_dest_sgl->length += copylen; |
2707388c S |
783 | srclen -= copylen; |
784 | src += copylen; | |
785 | ||
aaced993 | 786 | if (cur_dest_sgl->length == PAGE_SIZE) { |
2707388c | 787 | /* full..move to next entry */ |
aaced993 | 788 | kunmap_atomic((void *)bounce_addr); |
8de58074 | 789 | bounce_addr = 0; |
2707388c | 790 | j++; |
8de58074 | 791 | } |
2707388c | 792 | |
8de58074 | 793 | /* if we need to use another bounce buffer */ |
aaced993 S |
794 | if (srclen && bounce_addr == 0) { |
795 | cur_dest_sgl = sg_next(cur_dest_sgl); | |
796 | bounce_addr = (unsigned long) | |
797 | kmap_atomic( | |
798 | sg_page(cur_dest_sgl)); | |
799 | } | |
2707388c | 800 | |
2707388c S |
801 | } |
802 | ||
aaced993 S |
803 | kunmap_atomic((void *)(src_addr - cur_src_sgl->offset)); |
804 | cur_src_sgl = sg_next(cur_src_sgl); | |
2707388c S |
805 | } |
806 | ||
8de58074 | 807 | if (bounce_addr) |
aaced993 | 808 | kunmap_atomic((void *)bounce_addr); |
8de58074 | 809 | |
2707388c S |
810 | local_irq_restore(flags); |
811 | ||
812 | return total_copied; | |
813 | } | |
814 | ||
6f94d5de S |
815 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
816 | { | |
817 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
818 | struct storvsc_device *stor_device; | |
819 | struct vmstorage_channel_properties props; | |
820 | ||
821 | stor_device = get_out_stor_device(device); | |
822 | if (!stor_device) | |
823 | return; | |
824 | ||
825 | if (stor_device->open_sub_channel == false) | |
826 | return; | |
827 | ||
828 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
829 | ||
830 | vmbus_open(new_sc, | |
831 | storvsc_ringbuffer_size, | |
832 | storvsc_ringbuffer_size, | |
833 | (void *)&props, | |
834 | sizeof(struct vmstorage_channel_properties), | |
835 | storvsc_on_channel_callback, new_sc); | |
836 | } | |
837 | ||
838 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
839 | { | |
840 | struct storvsc_device *stor_device; | |
841 | int num_cpus = num_online_cpus(); | |
842 | int num_sc; | |
843 | struct storvsc_cmd_request *request; | |
844 | struct vstor_packet *vstor_packet; | |
845 | int ret, t; | |
846 | ||
847 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
848 | stor_device = get_out_stor_device(device); | |
849 | if (!stor_device) | |
850 | return; | |
851 | ||
852 | request = &stor_device->init_request; | |
853 | vstor_packet = &request->vstor_packet; | |
854 | ||
855 | stor_device->open_sub_channel = true; | |
856 | /* | |
857 | * Establish a handler for dealing with subchannels. | |
858 | */ | |
859 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
860 | ||
861 | /* | |
862 | * Check to see if sub-channels have already been created. This | |
863 | * can happen when this driver is re-loaded after unloading. | |
864 | */ | |
865 | ||
866 | if (vmbus_are_subchannels_present(device->channel)) | |
867 | return; | |
868 | ||
869 | stor_device->open_sub_channel = false; | |
870 | /* | |
871 | * Request the host to create sub-channels. | |
872 | */ | |
873 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
874 | init_completion(&request->wait_event); | |
875 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
876 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
877 | vstor_packet->sub_channel_count = num_sc; | |
878 | ||
879 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
880 | (sizeof(struct vstor_packet) - | |
881 | vmscsi_size_delta), | |
882 | (unsigned long)request, | |
883 | VM_PKT_DATA_INBAND, | |
884 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
885 | ||
886 | if (ret != 0) | |
887 | return; | |
888 | ||
889 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
890 | if (t == 0) | |
891 | return; | |
892 | ||
893 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
894 | vstor_packet->status != 0) | |
895 | return; | |
896 | ||
897 | /* | |
898 | * Now that we created the sub-channels, invoke the check; this | |
899 | * may trigger the callback. | |
900 | */ | |
901 | stor_device->open_sub_channel = true; | |
902 | vmbus_are_subchannels_present(device->channel); | |
903 | } | |
904 | ||
8dcf37d4 S |
905 | static int storvsc_channel_init(struct hv_device *device) |
906 | { | |
907 | struct storvsc_device *stor_device; | |
61eaffc9 | 908 | struct storvsc_cmd_request *request; |
8dcf37d4 | 909 | struct vstor_packet *vstor_packet; |
1a363108 | 910 | int ret, t, i; |
6f94d5de S |
911 | int max_chns; |
912 | bool process_sub_channels = false; | |
8dcf37d4 S |
913 | |
914 | stor_device = get_out_stor_device(device); | |
915 | if (!stor_device) | |
916 | return -ENODEV; | |
917 | ||
918 | request = &stor_device->init_request; | |
919 | vstor_packet = &request->vstor_packet; | |
920 | ||
921 | /* | |
922 | * Now, initiate the vsc/vsp initialization protocol on the open | |
923 | * channel | |
924 | */ | |
61eaffc9 | 925 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
926 | init_completion(&request->wait_event); |
927 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
928 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
929 | ||
930 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
931 | (sizeof(struct vstor_packet) - |
932 | vmscsi_size_delta), | |
8dcf37d4 S |
933 | (unsigned long)request, |
934 | VM_PKT_DATA_INBAND, | |
935 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
936 | if (ret != 0) | |
937 | goto cleanup; | |
938 | ||
939 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
940 | if (t == 0) { | |
941 | ret = -ETIMEDOUT; | |
942 | goto cleanup; | |
943 | } | |
944 | ||
945 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
946 | vstor_packet->status != 0) | |
947 | goto cleanup; | |
948 | ||
949 | ||
1a363108 KM |
950 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
951 | /* reuse the packet for version range supported */ | |
952 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
953 | vstor_packet->operation = | |
954 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
955 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 | 956 | |
1a363108 KM |
957 | vstor_packet->version.major_minor = |
958 | vmstor_protocols[i].protocol_version; | |
85904a5e | 959 | |
1a363108 KM |
960 | /* |
961 | * The revision number is only used in Windows; set it to 0. | |
962 | */ | |
963 | vstor_packet->version.revision = 0; | |
8dcf37d4 | 964 | |
1a363108 | 965 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
8b612fa2 S |
966 | (sizeof(struct vstor_packet) - |
967 | vmscsi_size_delta), | |
8dcf37d4 S |
968 | (unsigned long)request, |
969 | VM_PKT_DATA_INBAND, | |
970 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1a363108 KM |
971 | if (ret != 0) |
972 | goto cleanup; | |
8dcf37d4 | 973 | |
1a363108 KM |
974 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
975 | if (t == 0) { | |
976 | ret = -ETIMEDOUT; | |
977 | goto cleanup; | |
978 | } | |
979 | ||
980 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) { | |
981 | ret = -EINVAL; | |
982 | goto cleanup; | |
983 | } | |
984 | ||
985 | if (vstor_packet->status == 0) { | |
986 | vmstor_proto_version = | |
987 | vmstor_protocols[i].protocol_version; | |
988 | ||
989 | sense_buffer_size = | |
990 | vmstor_protocols[i].sense_buffer_size; | |
991 | ||
992 | vmscsi_size_delta = | |
993 | vmstor_protocols[i].vmscsi_size_delta; | |
994 | ||
995 | break; | |
996 | } | |
8dcf37d4 S |
997 | } |
998 | ||
1a363108 KM |
999 | if (vstor_packet->status != 0) { |
1000 | ret = -EINVAL; | |
8dcf37d4 | 1001 | goto cleanup; |
1a363108 | 1002 | } |
8dcf37d4 S |
1003 | |
1004 | ||
1005 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
1006 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
1007 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 S |
1008 | |
1009 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1010 | (sizeof(struct vstor_packet) - |
1011 | vmscsi_size_delta), | |
8dcf37d4 S |
1012 | (unsigned long)request, |
1013 | VM_PKT_DATA_INBAND, | |
1014 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1015 | ||
1016 | if (ret != 0) | |
1017 | goto cleanup; | |
1018 | ||
1019 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
1020 | if (t == 0) { | |
1021 | ret = -ETIMEDOUT; | |
1022 | goto cleanup; | |
1023 | } | |
1024 | ||
1025 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
1026 | vstor_packet->status != 0) | |
1027 | goto cleanup; | |
1028 | ||
6f94d5de S |
1029 | /* |
1030 | * Check to see if multi-channel support is there. | |
1031 | * Hosts that implement protocol version of 5.1 and above | |
1032 | * support multi-channel. | |
1033 | */ | |
1034 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
6ee5c615 | 1035 | if (vmbus_proto_version >= VERSION_WIN8) { |
6f94d5de S |
1036 | if (vstor_packet->storage_channel_properties.flags & |
1037 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
1038 | process_sub_channels = true; | |
1039 | } | |
5117b936 S |
1040 | stor_device->max_transfer_bytes = |
1041 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 1042 | |
8dcf37d4 S |
1043 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
1044 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
1045 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1046 | ||
1047 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1048 | (sizeof(struct vstor_packet) - |
1049 | vmscsi_size_delta), | |
8dcf37d4 S |
1050 | (unsigned long)request, |
1051 | VM_PKT_DATA_INBAND, | |
1052 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1053 | ||
1054 | if (ret != 0) | |
1055 | goto cleanup; | |
1056 | ||
1057 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
1058 | if (t == 0) { | |
1059 | ret = -ETIMEDOUT; | |
1060 | goto cleanup; | |
1061 | } | |
1062 | ||
1063 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
1064 | vstor_packet->status != 0) | |
1065 | goto cleanup; | |
1066 | ||
6f94d5de S |
1067 | if (process_sub_channels) |
1068 | handle_multichannel_storage(device, max_chns); | |
1069 | ||
8dcf37d4 S |
1070 | |
1071 | cleanup: | |
1072 | return ret; | |
1073 | } | |
1074 | ||
c50bd448 S |
1075 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1076 | struct scsi_cmnd *scmnd, | |
1077 | struct Scsi_Host *host, | |
1078 | u8 asc, u8 ascq) | |
1079 | { | |
1080 | struct storvsc_scan_work *wrk; | |
1081 | void (*process_err_fn)(struct work_struct *work); | |
1082 | bool do_work = false; | |
1083 | ||
1084 | switch (vm_srb->srb_status) { | |
1085 | case SRB_STATUS_ERROR: | |
1086 | /* | |
1087 | * If there is an error; offline the device since all | |
1088 | * error recovery strategies would have already been | |
1089 | * deployed on the host side. However, if the command | |
1090 | * were a pass-through command deal with it appropriately. | |
1091 | */ | |
1092 | switch (scmnd->cmnd[0]) { | |
1093 | case ATA_16: | |
1094 | case ATA_12: | |
1095 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1096 | break; | |
3533f860 S |
1097 | /* |
1098 | * On Some Windows hosts TEST_UNIT_READY command can return | |
1099 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
1100 | * based on the sense information. | |
1101 | */ | |
1102 | case TEST_UNIT_READY: | |
1103 | break; | |
c50bd448 S |
1104 | default: |
1105 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1106 | } | |
1107 | break; | |
1108 | case SRB_STATUS_INVALID_LUN: | |
1109 | do_work = true; | |
1110 | process_err_fn = storvsc_remove_lun; | |
1111 | break; | |
6781209e S |
1112 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
1113 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
1114 | do_work = true; | |
1115 | process_err_fn = storvsc_device_scan; | |
1116 | /* | |
1117 | * Retry the I/O that trigerred this. | |
1118 | */ | |
1119 | set_host_byte(scmnd, DID_REQUEUE); | |
1120 | } | |
1121 | break; | |
c50bd448 | 1122 | } |
6781209e | 1123 | |
c50bd448 S |
1124 | if (!do_work) |
1125 | return; | |
1126 | ||
1127 | /* | |
1128 | * We need to schedule work to process this error; schedule it. | |
1129 | */ | |
1130 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1131 | if (!wrk) { | |
1132 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1133 | return; | |
1134 | } | |
1135 | ||
1136 | wrk->host = host; | |
1137 | wrk->lun = vm_srb->lun; | |
1138 | INIT_WORK(&wrk->work, process_err_fn); | |
1139 | schedule_work(&wrk->work); | |
1140 | } | |
1141 | ||
2707388c | 1142 | |
61eaffc9 | 1143 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 1144 | { |
2707388c S |
1145 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
1146 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
2707388c S |
1147 | struct scsi_sense_hdr sense_hdr; |
1148 | struct vmscsi_request *vm_srb; | |
c50bd448 S |
1149 | struct Scsi_Host *host; |
1150 | struct storvsc_device *stor_dev; | |
1151 | struct hv_device *dev = host_dev->dev; | |
be0cf6ca S |
1152 | u32 payload_sz = cmd_request->payload_sz; |
1153 | void *payload = cmd_request->payload; | |
c50bd448 S |
1154 | |
1155 | stor_dev = get_in_stor_device(dev); | |
1156 | host = stor_dev->host; | |
8dcf37d4 | 1157 | |
61eaffc9 | 1158 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
1159 | if (cmd_request->bounce_sgl_count) { |
1160 | if (vm_srb->data_in == READ_TYPE) | |
1161 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1162 | cmd_request->bounce_sgl, | |
1163 | scsi_sg_count(scmnd), | |
1164 | cmd_request->bounce_sgl_count); | |
1165 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1166 | cmd_request->bounce_sgl_count); | |
1167 | } | |
8dcf37d4 | 1168 | |
42e22cac S |
1169 | scmnd->result = vm_srb->scsi_status; |
1170 | ||
2707388c S |
1171 | if (scmnd->result) { |
1172 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1173 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
d811b848 HR |
1174 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1175 | &sense_hdr); | |
2707388c S |
1176 | } |
1177 | ||
c50bd448 S |
1178 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
1179 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
1180 | sense_hdr.ascq); | |
1181 | ||
2707388c | 1182 | scsi_set_resid(scmnd, |
be0cf6ca | 1183 | cmd_request->payload->range.len - |
2707388c S |
1184 | vm_srb->data_transfer_length); |
1185 | ||
ead3700d | 1186 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
1187 | |
1188 | if (payload_sz > | |
1189 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1190 | kfree(payload); | |
2707388c S |
1191 | } |
1192 | ||
1193 | static void storvsc_on_io_completion(struct hv_device *device, | |
1194 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1195 | struct storvsc_cmd_request *request) |
2707388c S |
1196 | { |
1197 | struct storvsc_device *stor_device; | |
1198 | struct vstor_packet *stor_pkt; | |
1199 | ||
1200 | stor_device = hv_get_drvdata(device); | |
1201 | stor_pkt = &request->vstor_packet; | |
1202 | ||
1203 | /* | |
1204 | * The current SCSI handling on the host side does | |
1205 | * not correctly handle: | |
1206 | * INQUIRY command with page code parameter set to 0x80 | |
1207 | * MODE_SENSE command with cmd[2] == 0x1c | |
1208 | * | |
1209 | * Setup srb and scsi status so this won't be fatal. | |
1210 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1211 | * (srb status == 0x4) and off-line the device in that case. |
1212 | */ | |
1213 | ||
1214 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1215 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1216 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1217 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1218 | } |
1219 | ||
8dcf37d4 S |
1220 | |
1221 | /* Copy over the status...etc */ | |
1222 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1223 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1224 | stor_pkt->vm_srb.sense_info_length = | |
1225 | vstor_packet->vm_srb.sense_info_length; | |
1226 | ||
8dcf37d4 S |
1227 | |
1228 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1229 | /* CHECK_CONDITION */ | |
16046320 S |
1230 | if (vstor_packet->vm_srb.srb_status & |
1231 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1232 | /* autosense data available */ |
8dcf37d4 | 1233 | |
ead3700d | 1234 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1235 | vstor_packet->vm_srb.sense_data, |
1236 | vstor_packet->vm_srb.sense_info_length); | |
1237 | ||
1238 | } | |
1239 | } | |
1240 | ||
1241 | stor_pkt->vm_srb.data_transfer_length = | |
1242 | vstor_packet->vm_srb.data_transfer_length; | |
1243 | ||
2707388c | 1244 | storvsc_command_completion(request); |
8dcf37d4 S |
1245 | |
1246 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1247 | stor_device->drain_notify) | |
1248 | wake_up(&stor_device->waiting_to_drain); | |
1249 | ||
1250 | ||
1251 | } | |
1252 | ||
1253 | static void storvsc_on_receive(struct hv_device *device, | |
1254 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1255 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1256 | { |
12675799 S |
1257 | struct storvsc_scan_work *work; |
1258 | struct storvsc_device *stor_device; | |
1259 | ||
8dcf37d4 S |
1260 | switch (vstor_packet->operation) { |
1261 | case VSTOR_OPERATION_COMPLETE_IO: | |
1262 | storvsc_on_io_completion(device, vstor_packet, request); | |
1263 | break; | |
12675799 | 1264 | |
8dcf37d4 | 1265 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
1266 | case VSTOR_OPERATION_ENUMERATE_BUS: |
1267 | stor_device = get_in_stor_device(device); | |
1268 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1269 | if (!work) | |
1270 | return; | |
1271 | ||
2a09ed3d | 1272 | INIT_WORK(&work->work, storvsc_host_scan); |
12675799 S |
1273 | work->host = stor_device->host; |
1274 | schedule_work(&work->work); | |
1275 | break; | |
8dcf37d4 S |
1276 | |
1277 | default: | |
1278 | break; | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | static void storvsc_on_channel_callback(void *context) | |
1283 | { | |
6f94d5de S |
1284 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1285 | struct hv_device *device; | |
8dcf37d4 S |
1286 | struct storvsc_device *stor_device; |
1287 | u32 bytes_recvd; | |
1288 | u64 request_id; | |
1289 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1290 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1291 | int ret; |
1292 | ||
6f94d5de S |
1293 | if (channel->primary_channel != NULL) |
1294 | device = channel->primary_channel->device_obj; | |
1295 | else | |
1296 | device = channel->device_obj; | |
8dcf37d4 S |
1297 | |
1298 | stor_device = get_in_stor_device(device); | |
1299 | if (!stor_device) | |
1300 | return; | |
1301 | ||
1302 | do { | |
6f94d5de | 1303 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1304 | ALIGN((sizeof(struct vstor_packet) - |
1305 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1306 | &bytes_recvd, &request_id); |
1307 | if (ret == 0 && bytes_recvd > 0) { | |
1308 | ||
61eaffc9 | 1309 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1310 | (unsigned long)request_id; |
1311 | ||
1312 | if ((request == &stor_device->init_request) || | |
1313 | (request == &stor_device->reset_request)) { | |
1314 | ||
1315 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1316 | (sizeof(struct vstor_packet) - |
1317 | vmscsi_size_delta)); | |
8dcf37d4 S |
1318 | complete(&request->wait_event); |
1319 | } else { | |
1320 | storvsc_on_receive(device, | |
1321 | (struct vstor_packet *)packet, | |
1322 | request); | |
1323 | } | |
1324 | } else { | |
1325 | break; | |
1326 | } | |
1327 | } while (1); | |
1328 | ||
1329 | return; | |
1330 | } | |
1331 | ||
1332 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1333 | { | |
1334 | struct vmstorage_channel_properties props; | |
1335 | int ret; | |
1336 | ||
1337 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1338 | ||
8dcf37d4 S |
1339 | ret = vmbus_open(device->channel, |
1340 | ring_size, | |
1341 | ring_size, | |
1342 | (void *)&props, | |
1343 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1344 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1345 | |
1346 | if (ret != 0) | |
1347 | return ret; | |
1348 | ||
1349 | ret = storvsc_channel_init(device); | |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
c1b3d067 | 1354 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1355 | { |
1356 | struct storvsc_device *stor_device; | |
1357 | unsigned long flags; | |
1358 | ||
cd654ea1 | 1359 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1360 | |
1361 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1362 | stor_device->destroy = true; | |
1363 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1364 | ||
1365 | /* | |
1366 | * At this point, all outbound traffic should be disable. We | |
1367 | * only allow inbound traffic (responses) to proceed so that | |
1368 | * outstanding requests can be completed. | |
1369 | */ | |
1370 | ||
1371 | storvsc_wait_to_drain(stor_device); | |
1372 | ||
1373 | /* | |
1374 | * Since we have already drained, we don't need to busy wait | |
1375 | * as was done in final_release_stor_device() | |
1376 | * Note that we cannot set the ext pointer to NULL until | |
1377 | * we have drained - to drain the outgoing packets, we need to | |
1378 | * allow incoming packets. | |
1379 | */ | |
1380 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1381 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1382 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1383 | ||
1384 | /* Close the channel */ | |
1385 | vmbus_close(device->channel); | |
1386 | ||
1387 | kfree(stor_device); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
c1b3d067 | 1391 | static int storvsc_do_io(struct hv_device *device, |
be0cf6ca | 1392 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1393 | { |
1394 | struct storvsc_device *stor_device; | |
1395 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1396 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 S |
1397 | int ret = 0; |
1398 | ||
1399 | vstor_packet = &request->vstor_packet; | |
1400 | stor_device = get_out_stor_device(device); | |
1401 | ||
1402 | if (!stor_device) | |
1403 | return -ENODEV; | |
1404 | ||
1405 | ||
1406 | request->device = device; | |
6f94d5de S |
1407 | /* |
1408 | * Select an an appropriate channel to send the request out. | |
1409 | */ | |
1410 | ||
1411 | outgoing_channel = vmbus_get_outgoing_channel(device->channel); | |
8dcf37d4 S |
1412 | |
1413 | ||
1414 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1415 | ||
8b612fa2 S |
1416 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1417 | vmscsi_size_delta); | |
8dcf37d4 S |
1418 | |
1419 | ||
8b612fa2 | 1420 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1421 | |
1422 | ||
1423 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1424 | request->payload->range.len; |
8dcf37d4 S |
1425 | |
1426 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1427 | ||
be0cf6ca S |
1428 | if (request->payload->range.len) { |
1429 | ||
1430 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1431 | request->payload, request->payload_sz, | |
8dcf37d4 | 1432 | vstor_packet, |
8b612fa2 S |
1433 | (sizeof(struct vstor_packet) - |
1434 | vmscsi_size_delta), | |
8dcf37d4 S |
1435 | (unsigned long)request); |
1436 | } else { | |
0147dabc | 1437 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 S |
1438 | (sizeof(struct vstor_packet) - |
1439 | vmscsi_size_delta), | |
8dcf37d4 S |
1440 | (unsigned long)request, |
1441 | VM_PKT_DATA_INBAND, | |
1442 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1443 | } | |
1444 | ||
1445 | if (ret != 0) | |
1446 | return ret; | |
1447 | ||
1448 | atomic_inc(&stor_device->num_outstanding_req); | |
1449 | ||
1450 | return ret; | |
1451 | } | |
1452 | ||
419f2d03 S |
1453 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1454 | { | |
419f2d03 | 1455 | |
419f2d03 S |
1456 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1457 | ||
419f2d03 | 1458 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1459 | |
893def38 S |
1460 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1461 | ||
3e8f4f40 OH |
1462 | sdevice->no_write_same = 1; |
1463 | ||
f3cfabce S |
1464 | /* |
1465 | * Add blist flags to permit the reading of the VPD pages even when | |
1466 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1467 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1468 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1469 | */ | |
1470 | sdevice->sdev_bflags |= msft_blist_flags; | |
1471 | ||
b0a93d96 S |
1472 | /* |
1473 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
1474 | * if the device is a MSFT virtual device. | |
1475 | */ | |
1476 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
1477 | switch (vmbus_proto_version) { | |
1478 | case VERSION_WIN8: | |
1479 | case VERSION_WIN8_1: | |
1480 | sdevice->scsi_level = SCSI_SPC_3; | |
1481 | break; | |
1482 | } | |
1483 | } | |
1484 | ||
419f2d03 S |
1485 | return 0; |
1486 | } | |
1487 | ||
62838ce2 S |
1488 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1489 | sector_t capacity, int *info) | |
1490 | { | |
5326fd5c S |
1491 | sector_t nsect = capacity; |
1492 | sector_t cylinders = nsect; | |
1493 | int heads, sectors_pt; | |
62838ce2 | 1494 | |
5326fd5c S |
1495 | /* |
1496 | * We are making up these values; let us keep it simple. | |
1497 | */ | |
1498 | heads = 0xff; | |
1499 | sectors_pt = 0x3f; /* Sectors per track */ | |
1500 | sector_div(cylinders, heads * sectors_pt); | |
1501 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1502 | cylinders = 0xffff; | |
62838ce2 S |
1503 | |
1504 | info[0] = heads; | |
5326fd5c S |
1505 | info[1] = sectors_pt; |
1506 | info[2] = (int)cylinders; | |
62838ce2 | 1507 | |
62838ce2 S |
1508 | return 0; |
1509 | } | |
aa3d789e | 1510 | |
4b270c8b | 1511 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1512 | { |
4b270c8b S |
1513 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1514 | struct hv_device *device = host_dev->dev; | |
1515 | ||
aa3d789e | 1516 | struct storvsc_device *stor_device; |
61eaffc9 | 1517 | struct storvsc_cmd_request *request; |
aa3d789e S |
1518 | struct vstor_packet *vstor_packet; |
1519 | int ret, t; | |
1520 | ||
aa3d789e | 1521 | |
1eaaddf9 | 1522 | stor_device = get_out_stor_device(device); |
aa3d789e | 1523 | if (!stor_device) |
a00e8224 | 1524 | return FAILED; |
aa3d789e S |
1525 | |
1526 | request = &stor_device->reset_request; | |
1527 | vstor_packet = &request->vstor_packet; | |
1528 | ||
1529 | init_completion(&request->wait_event); | |
1530 | ||
1531 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1532 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1533 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1534 | ||
1535 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1536 | (sizeof(struct vstor_packet) - |
1537 | vmscsi_size_delta), | |
aa3d789e S |
1538 | (unsigned long)&stor_device->reset_request, |
1539 | VM_PKT_DATA_INBAND, | |
1540 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1541 | if (ret != 0) | |
a00e8224 | 1542 | return FAILED; |
aa3d789e | 1543 | |
46d2eb6d | 1544 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1545 | if (t == 0) |
1546 | return TIMEOUT_ERROR; | |
aa3d789e | 1547 | |
aa3d789e S |
1548 | |
1549 | /* | |
1550 | * At this point, all outstanding requests in the adapter | |
1551 | * should have been flushed out and return to us | |
5c1b10ab S |
1552 | * There is a potential race here where the host may be in |
1553 | * the process of responding when we return from here. | |
1554 | * Just wait for all in-transit packets to be accounted for | |
1555 | * before we return from here. | |
aa3d789e | 1556 | */ |
5c1b10ab | 1557 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1558 | |
a00e8224 | 1559 | return SUCCESS; |
aa3d789e S |
1560 | } |
1561 | ||
56b26e69 S |
1562 | /* |
1563 | * The host guarantees to respond to each command, although I/O latencies might | |
1564 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1565 | * chance to perform EH. | |
1566 | */ | |
1567 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1568 | { | |
1569 | return BLK_EH_RESET_TIMER; | |
1570 | } | |
1571 | ||
c77b63b6 | 1572 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1573 | { |
1574 | bool allowed = true; | |
1575 | u8 scsi_op = scmnd->cmnd[0]; | |
1576 | ||
1577 | switch (scsi_op) { | |
3e8f4f40 OH |
1578 | /* the host does not handle WRITE_SAME, log accident usage */ |
1579 | case WRITE_SAME: | |
c77b63b6 S |
1580 | /* |
1581 | * smartd sends this command and the host does not handle | |
1582 | * this. So, don't send it. | |
1583 | */ | |
41098f8f | 1584 | case SET_WINDOW: |
59e00e74 | 1585 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1586 | allowed = false; |
1587 | break; | |
1588 | default: | |
1589 | break; | |
92ae4ebd OH |
1590 | } |
1591 | return allowed; | |
1592 | } | |
c5b463ae | 1593 | |
bab445e1 | 1594 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1595 | { |
1596 | int ret; | |
bab445e1 | 1597 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1598 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1599 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1600 | int i; |
1601 | struct scatterlist *sgl; | |
1602 | unsigned int sg_count = 0; | |
1603 | struct vmscsi_request *vm_srb; | |
aaced993 | 1604 | struct scatterlist *cur_sgl; |
be0cf6ca S |
1605 | struct vmbus_packet_mpb_array *payload; |
1606 | u32 payload_sz; | |
1607 | u32 length; | |
c5b463ae | 1608 | |
2492fd7a | 1609 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1610 | /* |
1611 | * On legacy hosts filter unimplemented commands. | |
1612 | * Future hosts are expected to correctly handle | |
1613 | * unsupported commands. Furthermore, it is | |
1614 | * possible that some of the currently | |
1615 | * unsupported commands maybe supported in | |
1616 | * future versions of the host. | |
1617 | */ | |
1618 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1619 | scmnd->scsi_done(scmnd); | |
1620 | return 0; | |
1621 | } | |
92ae4ebd | 1622 | } |
c5b463ae | 1623 | |
c5b463ae | 1624 | /* Setup the cmd request */ |
c5b463ae S |
1625 | cmd_request->cmd = scmnd; |
1626 | ||
61eaffc9 | 1627 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1628 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1629 | |
f885fb73 S |
1630 | vm_srb->win8_extension.srb_flags |= |
1631 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | | |
1632 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER); | |
c5b463ae S |
1633 | |
1634 | /* Build the SRB */ | |
1635 | switch (scmnd->sc_data_direction) { | |
1636 | case DMA_TO_DEVICE: | |
1637 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1638 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1639 | break; |
1640 | case DMA_FROM_DEVICE: | |
1641 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1642 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1643 | break; |
cb1cf080 | 1644 | case DMA_NONE: |
c5b463ae | 1645 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1646 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1647 | break; |
cb1cf080 VK |
1648 | default: |
1649 | /* | |
1650 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1651 | * supposed to see here. | |
1652 | */ | |
1653 | WARN(1, "Unexpected data direction: %d\n", | |
1654 | scmnd->sc_data_direction); | |
1655 | return -EINVAL; | |
c5b463ae S |
1656 | } |
1657 | ||
c5b463ae | 1658 | |
c5b463ae S |
1659 | vm_srb->port_number = host_dev->port; |
1660 | vm_srb->path_id = scmnd->device->channel; | |
1661 | vm_srb->target_id = scmnd->device->id; | |
1662 | vm_srb->lun = scmnd->device->lun; | |
1663 | ||
c5b463ae S |
1664 | vm_srb->cdb_length = scmnd->cmd_len; |
1665 | ||
1666 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1667 | ||
be0cf6ca S |
1668 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1669 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1670 | |
be0cf6ca S |
1671 | length = scsi_bufflen(scmnd); |
1672 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1673 | payload_sz = sizeof(cmd_request->mpb); | |
1674 | ||
1675 | if (sg_count) { | |
c5b463ae S |
1676 | /* check if we need to bounce the sgl */ |
1677 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1678 | cmd_request->bounce_sgl = | |
be0cf6ca S |
1679 | create_bounce_buffer(sgl, sg_count, |
1680 | length, | |
6e8087a4 | 1681 | vm_srb->data_in); |
ead3700d CH |
1682 | if (!cmd_request->bounce_sgl) |
1683 | return SCSI_MLQUEUE_HOST_BUSY; | |
c5b463ae S |
1684 | |
1685 | cmd_request->bounce_sgl_count = | |
be0cf6ca | 1686 | ALIGN(length, PAGE_SIZE) >> PAGE_SHIFT; |
c5b463ae | 1687 | |
fa23b8c7 S |
1688 | if (vm_srb->data_in == WRITE_TYPE) |
1689 | copy_to_bounce_buffer(sgl, | |
be0cf6ca | 1690 | cmd_request->bounce_sgl, sg_count); |
c5b463ae S |
1691 | |
1692 | sgl = cmd_request->bounce_sgl; | |
1693 | sg_count = cmd_request->bounce_sgl_count; | |
1694 | } | |
1695 | ||
be0cf6ca S |
1696 | |
1697 | if (sg_count > MAX_PAGE_BUFFER_COUNT) { | |
1698 | ||
1699 | payload_sz = (sg_count * sizeof(void *) + | |
1700 | sizeof(struct vmbus_packet_mpb_array)); | |
1701 | payload = kmalloc(payload_sz, GFP_ATOMIC); | |
1702 | if (!payload) { | |
1703 | if (cmd_request->bounce_sgl_count) | |
1704 | destroy_bounce_buffer( | |
1705 | cmd_request->bounce_sgl, | |
1706 | cmd_request->bounce_sgl_count); | |
1707 | ||
1708 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | payload->range.len = length; | |
1713 | payload->range.offset = sgl[0].offset; | |
1714 | ||
aaced993 S |
1715 | cur_sgl = sgl; |
1716 | for (i = 0; i < sg_count; i++) { | |
be0cf6ca | 1717 | payload->range.pfn_array[i] = |
aaced993 S |
1718 | page_to_pfn(sg_page((cur_sgl))); |
1719 | cur_sgl = sg_next(cur_sgl); | |
1720 | } | |
c5b463ae S |
1721 | |
1722 | } else if (scsi_sglist(scmnd)) { | |
be0cf6ca S |
1723 | payload->range.len = length; |
1724 | payload->range.offset = | |
c5b463ae | 1725 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
be0cf6ca | 1726 | payload->range.pfn_array[0] = |
c5b463ae S |
1727 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1728 | } | |
1729 | ||
be0cf6ca S |
1730 | cmd_request->payload = payload; |
1731 | cmd_request->payload_sz = payload_sz; | |
1732 | ||
c5b463ae | 1733 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1734 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1735 | |
d2598f01 | 1736 | if (ret == -EAGAIN) { |
c5b463ae S |
1737 | /* no more space */ |
1738 | ||
e86fb5e8 | 1739 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1740 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1741 | cmd_request->bounce_sgl_count); |
c5b463ae | 1742 | |
ead3700d | 1743 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1744 | } |
1745 | ||
c77b63b6 | 1746 | return 0; |
c5b463ae S |
1747 | } |
1748 | ||
bef4a34a | 1749 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1750 | .module = THIS_MODULE, |
1751 | .name = "storvsc_host_t", | |
ead3700d | 1752 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1753 | .bios_param = storvsc_get_chs, |
1754 | .queuecommand = storvsc_queuecommand, | |
1755 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1756 | .proc_name = "storvsc_host", |
56b26e69 | 1757 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1758 | .slave_configure = storvsc_device_configure, |
52f9614d | 1759 | .cmd_per_lun = 255, |
ff568d3a | 1760 | .this_id = -1, |
be0cf6ca | 1761 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1762 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1763 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1764 | .no_write_same = 1, |
bef4a34a HJ |
1765 | }; |
1766 | ||
ef52a81b S |
1767 | enum { |
1768 | SCSI_GUID, | |
1769 | IDE_GUID, | |
bde6d0f9 | 1770 | SFC_GUID, |
ef52a81b S |
1771 | }; |
1772 | ||
d847b5fe | 1773 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1774 | /* SCSI guid */ |
35c3bc20 S |
1775 | { HV_SCSI_GUID, |
1776 | .driver_data = SCSI_GUID | |
1777 | }, | |
21e37742 | 1778 | /* IDE guid */ |
35c3bc20 S |
1779 | { HV_IDE_GUID, |
1780 | .driver_data = IDE_GUID | |
1781 | }, | |
bde6d0f9 S |
1782 | /* Fibre Channel GUID */ |
1783 | { | |
1784 | HV_SYNTHFC_GUID, | |
1785 | .driver_data = SFC_GUID | |
1786 | }, | |
c45cf2d4 | 1787 | { }, |
d847b5fe | 1788 | }; |
bef4a34a | 1789 | |
d847b5fe | 1790 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1791 | |
84946899 S |
1792 | static int storvsc_probe(struct hv_device *device, |
1793 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1794 | { |
ff568d3a | 1795 | int ret; |
f458aada | 1796 | int num_cpus = num_online_cpus(); |
bef4a34a | 1797 | struct Scsi_Host *host; |
795b613d | 1798 | struct hv_host_device *host_dev; |
ef52a81b | 1799 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1800 | int target = 0; |
6e4198ce | 1801 | struct storvsc_device *stor_device; |
0fb8db29 S |
1802 | int max_luns_per_target; |
1803 | int max_targets; | |
1804 | int max_channels; | |
f458aada | 1805 | int max_sub_channels = 0; |
bd1f5d6a | 1806 | |
8b612fa2 S |
1807 | /* |
1808 | * Based on the windows host we are running on, | |
1809 | * set state to properly communicate with the host. | |
1810 | */ | |
1811 | ||
6ee5c615 | 1812 | if (vmbus_proto_version < VERSION_WIN8) { |
8b612fa2 S |
1813 | sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
1814 | vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
0fb8db29 S |
1815 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1816 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1817 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1818 | } else { |
adb6f9e1 S |
1819 | sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE; |
1820 | vmscsi_size_delta = 0; | |
0fb8db29 S |
1821 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1822 | max_targets = STORVSC_MAX_TARGETS; | |
1823 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada S |
1824 | /* |
1825 | * On Windows8 and above, we support sub-channels for storage. | |
1826 | * The number of sub-channels offerred is based on the number of | |
1827 | * VCPUs in the guest. | |
1828 | */ | |
1829 | max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); | |
8b612fa2 S |
1830 | } |
1831 | ||
f458aada S |
1832 | scsi_driver.can_queue = (max_outstanding_req_per_channel * |
1833 | (max_sub_channels + 1)); | |
1834 | ||
ff568d3a | 1835 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1836 | sizeof(struct hv_host_device)); |
f8feed06 | 1837 | if (!host) |
bef4a34a | 1838 | return -ENOMEM; |
bef4a34a | 1839 | |
7f33f30a | 1840 | host_dev = shost_priv(host); |
795b613d | 1841 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1842 | |
795b613d | 1843 | host_dev->port = host->host_no; |
97c15296 | 1844 | host_dev->dev = device; |
bef4a34a | 1845 | |
4e03e697 | 1846 | |
a13d35ab | 1847 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1848 | if (!stor_device) { |
225ce6ea | 1849 | ret = -ENOMEM; |
ce3e301c | 1850 | goto err_out0; |
6e4198ce | 1851 | } |
9efd21e1 | 1852 | |
a13d35ab | 1853 | stor_device->destroy = false; |
6f94d5de | 1854 | stor_device->open_sub_channel = false; |
a13d35ab S |
1855 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1856 | stor_device->device = device; | |
cd654ea1 S |
1857 | stor_device->host = host; |
1858 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1859 | |
6e4198ce S |
1860 | stor_device->port_number = host->host_no; |
1861 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1862 | if (ret) |
ce3e301c | 1863 | goto err_out1; |
bef4a34a | 1864 | |
6e4198ce S |
1865 | host_dev->path = stor_device->path_id; |
1866 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1867 | |
4cd83ecd S |
1868 | switch (dev_id->driver_data) { |
1869 | case SFC_GUID: | |
1870 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1871 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1872 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
1873 | break; | |
1874 | ||
1875 | case SCSI_GUID: | |
0fb8db29 S |
1876 | host->max_lun = max_luns_per_target; |
1877 | host->max_id = max_targets; | |
1878 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1879 | break; |
1880 | ||
1881 | default: | |
1882 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1883 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1884 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1885 | break; | |
1886 | } | |
cf55f4a8 MS |
1887 | /* max cmd length */ |
1888 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1889 | |
be0cf6ca S |
1890 | /* |
1891 | * set the table size based on the info we got | |
1892 | * from the host. | |
1893 | */ | |
1894 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
1895 | ||
454f18a9 | 1896 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1897 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1898 | if (ret != 0) |
ce3e301c | 1899 | goto err_out2; |
bef4a34a | 1900 | |
bd1f5d6a S |
1901 | if (!dev_is_ide) { |
1902 | scsi_scan_host(host); | |
59d22950 S |
1903 | } else { |
1904 | target = (device->dev_instance.b[5] << 8 | | |
1905 | device->dev_instance.b[4]); | |
1906 | ret = scsi_add_device(host, 0, target, 0); | |
1907 | if (ret) { | |
1908 | scsi_remove_host(host); | |
1909 | goto err_out2; | |
1910 | } | |
bef4a34a | 1911 | } |
bd1f5d6a | 1912 | return 0; |
bef4a34a | 1913 | |
ce3e301c | 1914 | err_out2: |
225ce6ea S |
1915 | /* |
1916 | * Once we have connected with the host, we would need to | |
1917 | * to invoke storvsc_dev_remove() to rollback this state and | |
1918 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1919 | * err_out1 label. |
225ce6ea | 1920 | */ |
bd1f5d6a | 1921 | storvsc_dev_remove(device); |
ce3e301c | 1922 | goto err_out0; |
225ce6ea S |
1923 | |
1924 | err_out1: | |
ce3e301c | 1925 | kfree(stor_device); |
225ce6ea S |
1926 | |
1927 | err_out0: | |
bd1f5d6a | 1928 | scsi_host_put(host); |
225ce6ea | 1929 | return ret; |
bef4a34a HJ |
1930 | } |
1931 | ||
ddcbf65e S |
1932 | static int storvsc_remove(struct hv_device *dev) |
1933 | { | |
1934 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1935 | struct Scsi_Host *host = stor_device->host; | |
1936 | ||
1937 | scsi_remove_host(host); | |
1938 | storvsc_dev_remove(dev); | |
1939 | scsi_host_put(host); | |
1940 | ||
1941 | return 0; | |
1942 | } | |
1943 | ||
40bf63ed | 1944 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1945 | .name = KBUILD_MODNAME, |
d847b5fe | 1946 | .id_table = id_table, |
40bf63ed S |
1947 | .probe = storvsc_probe, |
1948 | .remove = storvsc_remove, | |
39ae6fae | 1949 | }; |
7bd05b91 | 1950 | |
d9bbae83 | 1951 | static int __init storvsc_drv_init(void) |
f5c78872 | 1952 | { |
01415ab3 S |
1953 | |
1954 | /* | |
1955 | * Divide the ring buffer data size (which is 1 page less | |
1956 | * than the ring buffer size since that page is reserved for | |
1957 | * the ring buffer indices) by the max request size (which is | |
1958 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1959 | */ | |
01415ab3 | 1960 | max_outstanding_req_per_channel = |
768fa219 GKH |
1961 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1962 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1963 | sizeof(struct vstor_packet) + sizeof(u64) - |
1964 | vmscsi_size_delta, | |
768fa219 | 1965 | sizeof(u64))); |
f5c78872 | 1966 | |
768fa219 | 1967 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1968 | } |
1969 | ||
c63ba9e1 | 1970 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1971 | { |
768fa219 | 1972 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1973 | } |
1974 | ||
ff568d3a | 1975 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1976 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1977 | module_init(storvsc_drv_init); |
c63ba9e1 | 1978 | module_exit(storvsc_drv_exit); |