Commit | Line | Data |
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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
a1be1706 S |
22 | |
23 | #include <linux/kernel.h> | |
f0d79fe9 | 24 | #include <linux/wait.h> |
a1be1706 S |
25 | #include <linux/sched.h> |
26 | #include <linux/completion.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/delay.h> | |
bef4a34a | 30 | #include <linux/init.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
bef4a34a HJ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> | |
46a97191 | 34 | #include <linux/hyperv.h> |
56b26e69 | 35 | #include <linux/blkdev.h> |
bef4a34a HJ |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_tcq.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 43 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 44 | |
09f0355f | 45 | /* |
af9584b8 S |
46 | * All wire protocol details (storage protocol between the guest and the host) |
47 | * are consolidated here. | |
48 | * | |
49 | * Begin protocol definitions. | |
09f0355f S |
50 | */ |
51 | ||
09f0355f S |
52 | /* |
53 | * Version history: | |
54 | * V1 Beta: 0.1 | |
55 | * V1 RC < 2008/1/31: 1.0 | |
56 | * V1 RC > 2008/1/31: 2.0 | |
57 | * Win7: 4.2 | |
8b612fa2 | 58 | * Win8: 5.1 |
09f0355f S |
59 | */ |
60 | ||
8b612fa2 S |
61 | |
62 | #define VMSTOR_WIN7_MAJOR 4 | |
63 | #define VMSTOR_WIN7_MINOR 2 | |
64 | ||
65 | #define VMSTOR_WIN8_MAJOR 5 | |
66 | #define VMSTOR_WIN8_MINOR 1 | |
f0d79fe9 S |
67 | |
68 | ||
f0d79fe9 S |
69 | /* Packet structure describing virtual storage requests. */ |
70 | enum vstor_packet_operation { | |
71 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
72 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
73 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
74 | VSTOR_OPERATION_RESET_LUN = 4, | |
75 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
76 | VSTOR_OPERATION_RESET_BUS = 6, | |
77 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
78 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
79 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
80 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 81 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
82 | VSTOR_OPERATION_FCHBA_DATA = 12, |
83 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
84 | VSTOR_OPERATION_MAXIMUM = 13 | |
85 | }; | |
86 | ||
87 | /* | |
88 | * WWN packet for Fibre Channel HBA | |
89 | */ | |
90 | ||
91 | struct hv_fc_wwn_packet { | |
92 | bool primary_active; | |
93 | u8 reserved1; | |
94 | u8 reserved2; | |
95 | u8 primary_port_wwn[8]; | |
96 | u8 primary_node_wwn[8]; | |
97 | u8 secondary_port_wwn[8]; | |
98 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
99 | }; |
100 | ||
8b612fa2 S |
101 | |
102 | ||
103 | /* | |
104 | * SRB Flag Bits | |
105 | */ | |
106 | ||
107 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
108 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
109 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
110 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
111 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
112 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
113 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
114 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
115 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
116 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
117 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
118 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
119 | ||
120 | /* | |
121 | * This flag indicates the request is part of the workflow for processing a D3. | |
122 | */ | |
123 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
124 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
125 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
126 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
127 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
128 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
129 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
130 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
131 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
132 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
133 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
134 | ||
135 | ||
f0d79fe9 S |
136 | /* |
137 | * Platform neutral description of a scsi request - | |
138 | * this remains the same across the write regardless of 32/64 bit | |
139 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
140 | */ | |
6b2f9495 | 141 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
142 | |
143 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
144 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
145 | ||
146 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 147 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 148 | |
8b612fa2 S |
149 | /* |
150 | * Sense buffer size changed in win8; have a run-time | |
151 | * variable to track the size we should use. | |
152 | */ | |
153 | static int sense_buffer_size; | |
154 | ||
155 | /* | |
156 | * The size of the vmscsi_request has changed in win8. The | |
157 | * additional size is because of new elements added to the | |
158 | * structure. These elements are valid only when we are talking | |
159 | * to a win8 host. | |
160 | * Track the correction to size we need to apply. | |
161 | */ | |
162 | ||
163 | static int vmscsi_size_delta; | |
164 | static int vmstor_current_major; | |
165 | static int vmstor_current_minor; | |
166 | ||
167 | struct vmscsi_win8_extension { | |
168 | /* | |
169 | * The following were added in Windows 8 | |
170 | */ | |
171 | u16 reserve; | |
172 | u8 queue_tag; | |
173 | u8 queue_action; | |
174 | u32 srb_flags; | |
175 | u32 time_out_value; | |
176 | u32 queue_sort_ey; | |
177 | } __packed; | |
178 | ||
f0d79fe9 | 179 | struct vmscsi_request { |
c649114a S |
180 | u16 length; |
181 | u8 srb_status; | |
182 | u8 scsi_status; | |
f0d79fe9 | 183 | |
c649114a S |
184 | u8 port_number; |
185 | u8 path_id; | |
186 | u8 target_id; | |
187 | u8 lun; | |
f0d79fe9 | 188 | |
c649114a S |
189 | u8 cdb_length; |
190 | u8 sense_info_length; | |
191 | u8 data_in; | |
192 | u8 reserved; | |
f0d79fe9 | 193 | |
c649114a | 194 | u32 data_transfer_length; |
f0d79fe9 S |
195 | |
196 | union { | |
6b2f9495 S |
197 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
198 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
199 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 200 | }; |
8b612fa2 S |
201 | /* |
202 | * The following was added in win8. | |
203 | */ | |
204 | struct vmscsi_win8_extension win8_extension; | |
205 | ||
f0d79fe9 S |
206 | } __attribute((packed)); |
207 | ||
208 | ||
209 | /* | |
210 | * This structure is sent during the intialization phase to get the different | |
211 | * properties of the channel. | |
212 | */ | |
8b612fa2 S |
213 | |
214 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
215 | ||
f0d79fe9 | 216 | struct vmstorage_channel_properties { |
8b612fa2 S |
217 | u32 reserved; |
218 | u16 max_channel_cnt; | |
219 | u16 reserved1; | |
f0d79fe9 | 220 | |
8b612fa2 | 221 | u32 flags; |
c649114a | 222 | u32 max_transfer_bytes; |
f0d79fe9 | 223 | |
8b612fa2 | 224 | u64 reserved2; |
f0d79fe9 S |
225 | } __packed; |
226 | ||
227 | /* This structure is sent during the storage protocol negotiations. */ | |
228 | struct vmstorage_protocol_version { | |
229 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 230 | u16 major_minor; |
f0d79fe9 S |
231 | |
232 | /* | |
233 | * Revision number is auto-incremented whenever this file is changed | |
234 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
235 | * definitely indicate incompatibility--but it does indicate mismatched | |
236 | * builds. | |
c649114a | 237 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 238 | */ |
85904a5e | 239 | u16 revision; |
f0d79fe9 S |
240 | } __packed; |
241 | ||
242 | /* Channel Property Flags */ | |
243 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
244 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
245 | ||
246 | struct vstor_packet { | |
247 | /* Requested operation type */ | |
248 | enum vstor_packet_operation operation; | |
249 | ||
250 | /* Flags - see below for values */ | |
c649114a | 251 | u32 flags; |
f0d79fe9 S |
252 | |
253 | /* Status of the request returned from the server side. */ | |
c649114a | 254 | u32 status; |
f0d79fe9 S |
255 | |
256 | /* Data payload area */ | |
257 | union { | |
258 | /* | |
259 | * Structure used to forward SCSI commands from the | |
260 | * client to the server. | |
261 | */ | |
262 | struct vmscsi_request vm_srb; | |
263 | ||
264 | /* Structure used to query channel properties. */ | |
265 | struct vmstorage_channel_properties storage_channel_properties; | |
266 | ||
267 | /* Used during version negotiations. */ | |
268 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
269 | |
270 | /* Fibre channel address packet */ | |
271 | struct hv_fc_wwn_packet wwn_packet; | |
272 | ||
273 | /* Number of sub-channels to create */ | |
274 | u16 sub_channel_count; | |
275 | ||
276 | /* This will be the maximum of the union members */ | |
277 | u8 buffer[0x34]; | |
f0d79fe9 S |
278 | }; |
279 | } __packed; | |
280 | ||
f0d79fe9 | 281 | /* |
09f0355f S |
282 | * Packet Flags: |
283 | * | |
f0d79fe9 S |
284 | * This flag indicates that the server should send back a completion for this |
285 | * packet. | |
286 | */ | |
09f0355f | 287 | |
f0d79fe9 S |
288 | #define REQUEST_COMPLETION_FLAG 0x1 |
289 | ||
f0d79fe9 S |
290 | /* Matches Windows-end */ |
291 | enum storvsc_request_type { | |
c649114a | 292 | WRITE_TYPE = 0, |
f0d79fe9 S |
293 | READ_TYPE, |
294 | UNKNOWN_TYPE, | |
295 | }; | |
296 | ||
16046320 S |
297 | /* |
298 | * SRB status codes and masks; a subset of the codes used here. | |
299 | */ | |
300 | ||
301 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
302 | #define SRB_STATUS_INVALID_LUN 0x20 | |
303 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 304 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
305 | #define SRB_STATUS_ERROR 0x04 |
306 | ||
af9584b8 S |
307 | /* |
308 | * This is the end of Protocol specific defines. | |
309 | */ | |
310 | ||
b9ec3a55 | 311 | static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
f458aada S |
312 | static u32 max_outstanding_req_per_channel; |
313 | ||
314 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
315 | |
316 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
317 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
318 | ||
f458aada S |
319 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
320 | MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); | |
893def38 S |
321 | /* |
322 | * Timeout in seconds for all devices managed by this driver. | |
323 | */ | |
324 | static int storvsc_timeout = 180; | |
325 | ||
f3cfabce S |
326 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
327 | ||
af9584b8 | 328 | |
6f94d5de S |
329 | static void storvsc_on_channel_callback(void *context); |
330 | ||
4cd83ecd S |
331 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
332 | #define STORVSC_MAX_TARGETS 2 | |
333 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 334 | |
4cd83ecd S |
335 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
336 | #define STORVSC_FC_MAX_TARGETS 128 | |
337 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 338 | |
4cd83ecd S |
339 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
340 | #define STORVSC_IDE_MAX_TARGETS 1 | |
341 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 342 | |
61eaffc9 | 343 | struct storvsc_cmd_request { |
61eaffc9 S |
344 | struct scsi_cmnd *cmd; |
345 | ||
346 | unsigned int bounce_sgl_count; | |
347 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 348 | |
f0d79fe9 S |
349 | struct hv_device *device; |
350 | ||
351 | /* Synchronize the request/response if needed */ | |
352 | struct completion wait_event; | |
353 | ||
f0d79fe9 | 354 | struct hv_multipage_buffer data_buffer; |
f0d79fe9 S |
355 | struct vstor_packet vstor_packet; |
356 | }; | |
357 | ||
358 | ||
f0d79fe9 S |
359 | /* A storvsc device is a device object that contains a vmbus channel */ |
360 | struct storvsc_device { | |
361 | struct hv_device *device; | |
362 | ||
363 | bool destroy; | |
364 | bool drain_notify; | |
6f94d5de | 365 | bool open_sub_channel; |
f0d79fe9 | 366 | atomic_t num_outstanding_req; |
cd654ea1 | 367 | struct Scsi_Host *host; |
f0d79fe9 S |
368 | |
369 | wait_queue_head_t waiting_to_drain; | |
370 | ||
371 | /* | |
372 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
373 | * controller. In reality, the pathid, targetid is always 0 | |
374 | * and the port is set by us | |
375 | */ | |
376 | unsigned int port_number; | |
377 | unsigned char path_id; | |
378 | unsigned char target_id; | |
379 | ||
380 | /* Used for vsc/vsp channel reset process */ | |
61eaffc9 S |
381 | struct storvsc_cmd_request init_request; |
382 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
383 | }; |
384 | ||
ce3e301c S |
385 | struct hv_host_device { |
386 | struct hv_device *dev; | |
c1b3d067 S |
387 | unsigned int port; |
388 | unsigned char path; | |
389 | unsigned char target; | |
390 | }; | |
391 | ||
12675799 S |
392 | struct storvsc_scan_work { |
393 | struct work_struct work; | |
394 | struct Scsi_Host *host; | |
395 | uint lun; | |
396 | }; | |
397 | ||
6781209e S |
398 | static void storvsc_device_scan(struct work_struct *work) |
399 | { | |
400 | struct storvsc_scan_work *wrk; | |
401 | uint lun; | |
402 | struct scsi_device *sdev; | |
403 | ||
404 | wrk = container_of(work, struct storvsc_scan_work, work); | |
405 | lun = wrk->lun; | |
406 | ||
407 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
408 | if (!sdev) | |
409 | goto done; | |
410 | scsi_rescan_device(&sdev->sdev_gendev); | |
411 | scsi_device_put(sdev); | |
412 | ||
413 | done: | |
414 | kfree(wrk); | |
415 | } | |
416 | ||
2a09ed3d | 417 | static void storvsc_host_scan(struct work_struct *work) |
12675799 S |
418 | { |
419 | struct storvsc_scan_work *wrk; | |
2a09ed3d | 420 | struct Scsi_Host *host; |
34a716bc S |
421 | struct scsi_device *sdev; |
422 | unsigned long flags; | |
12675799 S |
423 | |
424 | wrk = container_of(work, struct storvsc_scan_work, work); | |
2a09ed3d S |
425 | host = wrk->host; |
426 | ||
34a716bc S |
427 | /* |
428 | * Before scanning the host, first check to see if any of the | |
429 | * currrently known devices have been hot removed. We issue a | |
430 | * "unit ready" command against all currently known devices. | |
431 | * This I/O will result in an error for devices that have been | |
432 | * removed. As part of handling the I/O error, we remove the device. | |
433 | * | |
434 | * When a LUN is added or removed, the host sends us a signal to | |
435 | * scan the host. Thus we are forced to discover the LUNs that | |
436 | * may have been removed this way. | |
437 | */ | |
438 | mutex_lock(&host->scan_mutex); | |
439 | spin_lock_irqsave(host->host_lock, flags); | |
440 | list_for_each_entry(sdev, &host->__devices, siblings) { | |
441 | spin_unlock_irqrestore(host->host_lock, flags); | |
442 | scsi_test_unit_ready(sdev, 1, 1, NULL); | |
443 | spin_lock_irqsave(host->host_lock, flags); | |
444 | continue; | |
445 | } | |
446 | spin_unlock_irqrestore(host->host_lock, flags); | |
447 | mutex_unlock(&host->scan_mutex); | |
448 | /* | |
449 | * Now scan the host to discover LUNs that may have been added. | |
450 | */ | |
2a09ed3d S |
451 | scsi_scan_host(host); |
452 | ||
12675799 S |
453 | kfree(wrk); |
454 | } | |
455 | ||
b4017319 S |
456 | static void storvsc_remove_lun(struct work_struct *work) |
457 | { | |
458 | struct storvsc_scan_work *wrk; | |
459 | struct scsi_device *sdev; | |
460 | ||
461 | wrk = container_of(work, struct storvsc_scan_work, work); | |
462 | if (!scsi_host_get(wrk->host)) | |
463 | goto done; | |
464 | ||
465 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
466 | ||
467 | if (sdev) { | |
468 | scsi_remove_device(sdev); | |
469 | scsi_device_put(sdev); | |
470 | } | |
471 | scsi_host_put(wrk->host); | |
472 | ||
473 | done: | |
474 | kfree(wrk); | |
475 | } | |
476 | ||
af9584b8 S |
477 | /* |
478 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
479 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
480 | */ | |
481 | ||
482 | static inline u16 storvsc_get_version(u8 major, u8 minor) | |
483 | { | |
484 | u16 version; | |
485 | ||
486 | version = ((major << 8) | minor); | |
487 | return version; | |
488 | } | |
489 | ||
a8c18c57 S |
490 | /* |
491 | * We can get incoming messages from the host that are not in response to | |
492 | * messages that we have sent out. An example of this would be messages | |
493 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
494 | * deal with potential race conditions where the driver may be in the | |
495 | * midst of being unloaded when we might receive an unsolicited message | |
496 | * from the host, we have implemented a mechanism to gurantee sequential | |
497 | * consistency: | |
498 | * | |
499 | * 1) Once the device is marked as being destroyed, we will fail all | |
500 | * outgoing messages. | |
501 | * 2) We permit incoming messages when the device is being destroyed, | |
502 | * only to properly account for messages already sent out. | |
503 | */ | |
504 | ||
f0d79fe9 S |
505 | static inline struct storvsc_device *get_out_stor_device( |
506 | struct hv_device *device) | |
507 | { | |
508 | struct storvsc_device *stor_device; | |
509 | ||
cd654ea1 | 510 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
511 | |
512 | if (stor_device && stor_device->destroy) | |
513 | stor_device = NULL; | |
514 | ||
515 | return stor_device; | |
516 | } | |
517 | ||
518 | ||
519 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
520 | { | |
521 | dev->drain_notify = true; | |
522 | wait_event(dev->waiting_to_drain, | |
523 | atomic_read(&dev->num_outstanding_req) == 0); | |
524 | dev->drain_notify = false; | |
525 | } | |
bef4a34a | 526 | |
8dcf37d4 S |
527 | static inline struct storvsc_device *get_in_stor_device( |
528 | struct hv_device *device) | |
529 | { | |
530 | struct storvsc_device *stor_device; | |
8dcf37d4 | 531 | |
cd654ea1 | 532 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
533 | |
534 | if (!stor_device) | |
535 | goto get_in_err; | |
536 | ||
537 | /* | |
538 | * If the device is being destroyed; allow incoming | |
539 | * traffic only to cleanup outstanding requests. | |
540 | */ | |
541 | ||
542 | if (stor_device->destroy && | |
543 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
544 | stor_device = NULL; | |
545 | ||
546 | get_in_err: | |
8dcf37d4 S |
547 | return stor_device; |
548 | ||
549 | } | |
550 | ||
2707388c S |
551 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
552 | unsigned int sg_count) | |
553 | { | |
554 | int i; | |
555 | struct page *page_buf; | |
556 | ||
557 | for (i = 0; i < sg_count; i++) { | |
558 | page_buf = sg_page((&sgl[i])); | |
559 | if (page_buf != NULL) | |
560 | __free_page(page_buf); | |
561 | } | |
562 | ||
563 | kfree(sgl); | |
564 | } | |
565 | ||
566 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
567 | { | |
568 | int i; | |
569 | ||
570 | /* No need to check */ | |
571 | if (sg_count < 2) | |
572 | return -1; | |
573 | ||
574 | /* We have at least 2 sg entries */ | |
575 | for (i = 0; i < sg_count; i++) { | |
576 | if (i == 0) { | |
577 | /* make sure 1st one does not have hole */ | |
578 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
579 | return i; | |
580 | } else if (i == sg_count - 1) { | |
581 | /* make sure last one does not have hole */ | |
582 | if (sgl[i].offset != 0) | |
583 | return i; | |
584 | } else { | |
585 | /* make sure no hole in the middle */ | |
586 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
587 | return i; | |
588 | } | |
589 | } | |
590 | return -1; | |
591 | } | |
592 | ||
593 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
594 | unsigned int sg_count, | |
595 | unsigned int len, | |
596 | int write) | |
597 | { | |
598 | int i; | |
599 | int num_pages; | |
600 | struct scatterlist *bounce_sgl; | |
601 | struct page *page_buf; | |
602 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
603 | ||
604 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
605 | ||
606 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
607 | if (!bounce_sgl) | |
608 | return NULL; | |
609 | ||
9d2696e6 | 610 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
611 | for (i = 0; i < num_pages; i++) { |
612 | page_buf = alloc_page(GFP_ATOMIC); | |
613 | if (!page_buf) | |
614 | goto cleanup; | |
615 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
616 | } | |
617 | ||
618 | return bounce_sgl; | |
619 | ||
620 | cleanup: | |
621 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
622 | return NULL; | |
623 | } | |
624 | ||
9f393834 LT |
625 | /* Disgusting wrapper functions */ |
626 | static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) | |
627 | { | |
628 | void *addr = kmap_atomic(sg_page(sgl + idx)); | |
629 | return (unsigned long)addr; | |
630 | } | |
8dcf37d4 | 631 | |
9f393834 LT |
632 | static inline void sg_kunmap_atomic(unsigned long addr) |
633 | { | |
634 | kunmap_atomic((void *)addr); | |
635 | } | |
8dcf37d4 | 636 | |
8dcf37d4 | 637 | |
2707388c S |
638 | /* Assume the original sgl has enough room */ |
639 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
640 | struct scatterlist *bounce_sgl, | |
641 | unsigned int orig_sgl_count, | |
642 | unsigned int bounce_sgl_count) | |
643 | { | |
644 | int i; | |
645 | int j = 0; | |
646 | unsigned long src, dest; | |
647 | unsigned int srclen, destlen, copylen; | |
648 | unsigned int total_copied = 0; | |
649 | unsigned long bounce_addr = 0; | |
650 | unsigned long dest_addr = 0; | |
651 | unsigned long flags; | |
652 | ||
653 | local_irq_save(flags); | |
654 | ||
655 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 656 | dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
657 | dest = dest_addr; |
658 | destlen = orig_sgl[i].length; | |
659 | ||
660 | if (bounce_addr == 0) | |
9f393834 | 661 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
662 | |
663 | while (destlen) { | |
664 | src = bounce_addr + bounce_sgl[j].offset; | |
665 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
666 | ||
667 | copylen = min(srclen, destlen); | |
668 | memcpy((void *)dest, (void *)src, copylen); | |
669 | ||
670 | total_copied += copylen; | |
671 | bounce_sgl[j].offset += copylen; | |
672 | destlen -= copylen; | |
673 | dest += copylen; | |
674 | ||
675 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
676 | /* full */ | |
9f393834 | 677 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
678 | j++; |
679 | ||
680 | /* | |
681 | * It is possible that the number of elements | |
682 | * in the bounce buffer may not be equal to | |
683 | * the number of elements in the original | |
684 | * scatter list. Handle this correctly. | |
685 | */ | |
686 | ||
687 | if (j == bounce_sgl_count) { | |
688 | /* | |
689 | * We are done; cleanup and return. | |
690 | */ | |
9f393834 | 691 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
692 | local_irq_restore(flags); |
693 | return total_copied; | |
694 | } | |
695 | ||
696 | /* if we need to use another bounce buffer */ | |
697 | if (destlen || i != orig_sgl_count - 1) | |
9f393834 | 698 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
699 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
700 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 701 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
702 | } |
703 | } | |
704 | ||
9f393834 | 705 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
706 | } |
707 | ||
708 | local_irq_restore(flags); | |
709 | ||
710 | return total_copied; | |
711 | } | |
712 | ||
713 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
714 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
715 | struct scatterlist *bounce_sgl, | |
716 | unsigned int orig_sgl_count) | |
717 | { | |
718 | int i; | |
719 | int j = 0; | |
720 | unsigned long src, dest; | |
721 | unsigned int srclen, destlen, copylen; | |
722 | unsigned int total_copied = 0; | |
723 | unsigned long bounce_addr = 0; | |
724 | unsigned long src_addr = 0; | |
725 | unsigned long flags; | |
726 | ||
727 | local_irq_save(flags); | |
728 | ||
729 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 730 | src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
731 | src = src_addr; |
732 | srclen = orig_sgl[i].length; | |
733 | ||
734 | if (bounce_addr == 0) | |
9f393834 | 735 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
736 | |
737 | while (srclen) { | |
738 | /* assume bounce offset always == 0 */ | |
739 | dest = bounce_addr + bounce_sgl[j].length; | |
740 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
741 | ||
742 | copylen = min(srclen, destlen); | |
743 | memcpy((void *)dest, (void *)src, copylen); | |
744 | ||
745 | total_copied += copylen; | |
746 | bounce_sgl[j].length += copylen; | |
747 | srclen -= copylen; | |
748 | src += copylen; | |
749 | ||
750 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
751 | /* full..move to next entry */ | |
9f393834 | 752 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
753 | j++; |
754 | ||
755 | /* if we need to use another bounce buffer */ | |
756 | if (srclen || i != orig_sgl_count - 1) | |
9f393834 | 757 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
758 | |
759 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
760 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 761 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
762 | } |
763 | } | |
764 | ||
9f393834 | 765 | sg_kunmap_atomic(src_addr - orig_sgl[i].offset); |
2707388c S |
766 | } |
767 | ||
768 | local_irq_restore(flags); | |
769 | ||
770 | return total_copied; | |
771 | } | |
772 | ||
6f94d5de S |
773 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
774 | { | |
775 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
776 | struct storvsc_device *stor_device; | |
777 | struct vmstorage_channel_properties props; | |
778 | ||
779 | stor_device = get_out_stor_device(device); | |
780 | if (!stor_device) | |
781 | return; | |
782 | ||
783 | if (stor_device->open_sub_channel == false) | |
784 | return; | |
785 | ||
786 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
787 | ||
788 | vmbus_open(new_sc, | |
789 | storvsc_ringbuffer_size, | |
790 | storvsc_ringbuffer_size, | |
791 | (void *)&props, | |
792 | sizeof(struct vmstorage_channel_properties), | |
793 | storvsc_on_channel_callback, new_sc); | |
794 | } | |
795 | ||
796 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
797 | { | |
798 | struct storvsc_device *stor_device; | |
799 | int num_cpus = num_online_cpus(); | |
800 | int num_sc; | |
801 | struct storvsc_cmd_request *request; | |
802 | struct vstor_packet *vstor_packet; | |
803 | int ret, t; | |
804 | ||
805 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
806 | stor_device = get_out_stor_device(device); | |
807 | if (!stor_device) | |
808 | return; | |
809 | ||
810 | request = &stor_device->init_request; | |
811 | vstor_packet = &request->vstor_packet; | |
812 | ||
813 | stor_device->open_sub_channel = true; | |
814 | /* | |
815 | * Establish a handler for dealing with subchannels. | |
816 | */ | |
817 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
818 | ||
819 | /* | |
820 | * Check to see if sub-channels have already been created. This | |
821 | * can happen when this driver is re-loaded after unloading. | |
822 | */ | |
823 | ||
824 | if (vmbus_are_subchannels_present(device->channel)) | |
825 | return; | |
826 | ||
827 | stor_device->open_sub_channel = false; | |
828 | /* | |
829 | * Request the host to create sub-channels. | |
830 | */ | |
831 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
832 | init_completion(&request->wait_event); | |
833 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
834 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
835 | vstor_packet->sub_channel_count = num_sc; | |
836 | ||
837 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
838 | (sizeof(struct vstor_packet) - | |
839 | vmscsi_size_delta), | |
840 | (unsigned long)request, | |
841 | VM_PKT_DATA_INBAND, | |
842 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
843 | ||
844 | if (ret != 0) | |
845 | return; | |
846 | ||
847 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
848 | if (t == 0) | |
849 | return; | |
850 | ||
851 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
852 | vstor_packet->status != 0) | |
853 | return; | |
854 | ||
855 | /* | |
856 | * Now that we created the sub-channels, invoke the check; this | |
857 | * may trigger the callback. | |
858 | */ | |
859 | stor_device->open_sub_channel = true; | |
860 | vmbus_are_subchannels_present(device->channel); | |
861 | } | |
862 | ||
8dcf37d4 S |
863 | static int storvsc_channel_init(struct hv_device *device) |
864 | { | |
865 | struct storvsc_device *stor_device; | |
61eaffc9 | 866 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
867 | struct vstor_packet *vstor_packet; |
868 | int ret, t; | |
6f94d5de S |
869 | int max_chns; |
870 | bool process_sub_channels = false; | |
8dcf37d4 S |
871 | |
872 | stor_device = get_out_stor_device(device); | |
873 | if (!stor_device) | |
874 | return -ENODEV; | |
875 | ||
876 | request = &stor_device->init_request; | |
877 | vstor_packet = &request->vstor_packet; | |
878 | ||
879 | /* | |
880 | * Now, initiate the vsc/vsp initialization protocol on the open | |
881 | * channel | |
882 | */ | |
61eaffc9 | 883 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
884 | init_completion(&request->wait_event); |
885 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
886 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
887 | ||
888 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
889 | (sizeof(struct vstor_packet) - |
890 | vmscsi_size_delta), | |
8dcf37d4 S |
891 | (unsigned long)request, |
892 | VM_PKT_DATA_INBAND, | |
893 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
894 | if (ret != 0) | |
895 | goto cleanup; | |
896 | ||
897 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
898 | if (t == 0) { | |
899 | ret = -ETIMEDOUT; | |
900 | goto cleanup; | |
901 | } | |
902 | ||
903 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
904 | vstor_packet->status != 0) | |
905 | goto cleanup; | |
906 | ||
907 | ||
908 | /* reuse the packet for version range supported */ | |
909 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
910 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
911 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
912 | ||
85904a5e | 913 | vstor_packet->version.major_minor = |
8b612fa2 | 914 | storvsc_get_version(vmstor_current_major, vmstor_current_minor); |
85904a5e S |
915 | |
916 | /* | |
917 | * The revision number is only used in Windows; set it to 0. | |
918 | */ | |
c649114a | 919 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
920 | |
921 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
922 | (sizeof(struct vstor_packet) - |
923 | vmscsi_size_delta), | |
8dcf37d4 S |
924 | (unsigned long)request, |
925 | VM_PKT_DATA_INBAND, | |
926 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
927 | if (ret != 0) | |
928 | goto cleanup; | |
929 | ||
930 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
931 | if (t == 0) { | |
932 | ret = -ETIMEDOUT; | |
933 | goto cleanup; | |
934 | } | |
935 | ||
936 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
937 | vstor_packet->status != 0) | |
938 | goto cleanup; | |
939 | ||
940 | ||
941 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
942 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
943 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 S |
944 | |
945 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
946 | (sizeof(struct vstor_packet) - |
947 | vmscsi_size_delta), | |
8dcf37d4 S |
948 | (unsigned long)request, |
949 | VM_PKT_DATA_INBAND, | |
950 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
951 | ||
952 | if (ret != 0) | |
953 | goto cleanup; | |
954 | ||
955 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
956 | if (t == 0) { | |
957 | ret = -ETIMEDOUT; | |
958 | goto cleanup; | |
959 | } | |
960 | ||
961 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
962 | vstor_packet->status != 0) | |
963 | goto cleanup; | |
964 | ||
6f94d5de S |
965 | /* |
966 | * Check to see if multi-channel support is there. | |
967 | * Hosts that implement protocol version of 5.1 and above | |
968 | * support multi-channel. | |
969 | */ | |
970 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
971 | if ((vmbus_proto_version != VERSION_WIN7) && | |
972 | (vmbus_proto_version != VERSION_WS2008)) { | |
973 | if (vstor_packet->storage_channel_properties.flags & | |
974 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
975 | process_sub_channels = true; | |
976 | } | |
977 | ||
8dcf37d4 S |
978 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
979 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
980 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
981 | ||
982 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
983 | (sizeof(struct vstor_packet) - |
984 | vmscsi_size_delta), | |
8dcf37d4 S |
985 | (unsigned long)request, |
986 | VM_PKT_DATA_INBAND, | |
987 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
988 | ||
989 | if (ret != 0) | |
990 | goto cleanup; | |
991 | ||
992 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
993 | if (t == 0) { | |
994 | ret = -ETIMEDOUT; | |
995 | goto cleanup; | |
996 | } | |
997 | ||
998 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
999 | vstor_packet->status != 0) | |
1000 | goto cleanup; | |
1001 | ||
6f94d5de S |
1002 | if (process_sub_channels) |
1003 | handle_multichannel_storage(device, max_chns); | |
1004 | ||
8dcf37d4 S |
1005 | |
1006 | cleanup: | |
1007 | return ret; | |
1008 | } | |
1009 | ||
c50bd448 S |
1010 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1011 | struct scsi_cmnd *scmnd, | |
1012 | struct Scsi_Host *host, | |
1013 | u8 asc, u8 ascq) | |
1014 | { | |
1015 | struct storvsc_scan_work *wrk; | |
1016 | void (*process_err_fn)(struct work_struct *work); | |
1017 | bool do_work = false; | |
1018 | ||
1019 | switch (vm_srb->srb_status) { | |
1020 | case SRB_STATUS_ERROR: | |
1021 | /* | |
1022 | * If there is an error; offline the device since all | |
1023 | * error recovery strategies would have already been | |
1024 | * deployed on the host side. However, if the command | |
1025 | * were a pass-through command deal with it appropriately. | |
1026 | */ | |
1027 | switch (scmnd->cmnd[0]) { | |
1028 | case ATA_16: | |
1029 | case ATA_12: | |
1030 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1031 | break; | |
3533f860 S |
1032 | /* |
1033 | * On Some Windows hosts TEST_UNIT_READY command can return | |
1034 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
1035 | * based on the sense information. | |
1036 | */ | |
1037 | case TEST_UNIT_READY: | |
1038 | break; | |
c50bd448 S |
1039 | default: |
1040 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1041 | } | |
1042 | break; | |
1043 | case SRB_STATUS_INVALID_LUN: | |
1044 | do_work = true; | |
1045 | process_err_fn = storvsc_remove_lun; | |
1046 | break; | |
6781209e S |
1047 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
1048 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
1049 | do_work = true; | |
1050 | process_err_fn = storvsc_device_scan; | |
1051 | /* | |
1052 | * Retry the I/O that trigerred this. | |
1053 | */ | |
1054 | set_host_byte(scmnd, DID_REQUEUE); | |
1055 | } | |
1056 | break; | |
c50bd448 | 1057 | } |
6781209e | 1058 | |
c50bd448 S |
1059 | if (!do_work) |
1060 | return; | |
1061 | ||
1062 | /* | |
1063 | * We need to schedule work to process this error; schedule it. | |
1064 | */ | |
1065 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1066 | if (!wrk) { | |
1067 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1068 | return; | |
1069 | } | |
1070 | ||
1071 | wrk->host = host; | |
1072 | wrk->lun = vm_srb->lun; | |
1073 | INIT_WORK(&wrk->work, process_err_fn); | |
1074 | schedule_work(&wrk->work); | |
1075 | } | |
1076 | ||
2707388c | 1077 | |
61eaffc9 | 1078 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 1079 | { |
2707388c S |
1080 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
1081 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
2707388c S |
1082 | struct scsi_sense_hdr sense_hdr; |
1083 | struct vmscsi_request *vm_srb; | |
c50bd448 S |
1084 | struct Scsi_Host *host; |
1085 | struct storvsc_device *stor_dev; | |
1086 | struct hv_device *dev = host_dev->dev; | |
1087 | ||
1088 | stor_dev = get_in_stor_device(dev); | |
1089 | host = stor_dev->host; | |
8dcf37d4 | 1090 | |
61eaffc9 | 1091 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
1092 | if (cmd_request->bounce_sgl_count) { |
1093 | if (vm_srb->data_in == READ_TYPE) | |
1094 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1095 | cmd_request->bounce_sgl, | |
1096 | scsi_sg_count(scmnd), | |
1097 | cmd_request->bounce_sgl_count); | |
1098 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1099 | cmd_request->bounce_sgl_count); | |
1100 | } | |
8dcf37d4 | 1101 | |
42e22cac S |
1102 | scmnd->result = vm_srb->scsi_status; |
1103 | ||
2707388c S |
1104 | if (scmnd->result) { |
1105 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1106 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
d811b848 HR |
1107 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1108 | &sense_hdr); | |
2707388c S |
1109 | } |
1110 | ||
c50bd448 S |
1111 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
1112 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
1113 | sense_hdr.ascq); | |
1114 | ||
2707388c | 1115 | scsi_set_resid(scmnd, |
61eaffc9 | 1116 | cmd_request->data_buffer.len - |
2707388c S |
1117 | vm_srb->data_transfer_length); |
1118 | ||
ead3700d | 1119 | scmnd->scsi_done(scmnd); |
2707388c S |
1120 | } |
1121 | ||
1122 | static void storvsc_on_io_completion(struct hv_device *device, | |
1123 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1124 | struct storvsc_cmd_request *request) |
2707388c S |
1125 | { |
1126 | struct storvsc_device *stor_device; | |
1127 | struct vstor_packet *stor_pkt; | |
1128 | ||
1129 | stor_device = hv_get_drvdata(device); | |
1130 | stor_pkt = &request->vstor_packet; | |
1131 | ||
1132 | /* | |
1133 | * The current SCSI handling on the host side does | |
1134 | * not correctly handle: | |
1135 | * INQUIRY command with page code parameter set to 0x80 | |
1136 | * MODE_SENSE command with cmd[2] == 0x1c | |
1137 | * | |
1138 | * Setup srb and scsi status so this won't be fatal. | |
1139 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1140 | * (srb status == 0x4) and off-line the device in that case. |
1141 | */ | |
1142 | ||
1143 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1144 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1145 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1146 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1147 | } |
1148 | ||
8dcf37d4 S |
1149 | |
1150 | /* Copy over the status...etc */ | |
1151 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1152 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1153 | stor_pkt->vm_srb.sense_info_length = | |
1154 | vstor_packet->vm_srb.sense_info_length; | |
1155 | ||
8dcf37d4 S |
1156 | |
1157 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1158 | /* CHECK_CONDITION */ | |
16046320 S |
1159 | if (vstor_packet->vm_srb.srb_status & |
1160 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1161 | /* autosense data available */ |
8dcf37d4 | 1162 | |
ead3700d | 1163 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1164 | vstor_packet->vm_srb.sense_data, |
1165 | vstor_packet->vm_srb.sense_info_length); | |
1166 | ||
1167 | } | |
1168 | } | |
1169 | ||
1170 | stor_pkt->vm_srb.data_transfer_length = | |
1171 | vstor_packet->vm_srb.data_transfer_length; | |
1172 | ||
2707388c | 1173 | storvsc_command_completion(request); |
8dcf37d4 S |
1174 | |
1175 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1176 | stor_device->drain_notify) | |
1177 | wake_up(&stor_device->waiting_to_drain); | |
1178 | ||
1179 | ||
1180 | } | |
1181 | ||
1182 | static void storvsc_on_receive(struct hv_device *device, | |
1183 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1184 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1185 | { |
12675799 S |
1186 | struct storvsc_scan_work *work; |
1187 | struct storvsc_device *stor_device; | |
1188 | ||
8dcf37d4 S |
1189 | switch (vstor_packet->operation) { |
1190 | case VSTOR_OPERATION_COMPLETE_IO: | |
1191 | storvsc_on_io_completion(device, vstor_packet, request); | |
1192 | break; | |
12675799 | 1193 | |
8dcf37d4 | 1194 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
1195 | case VSTOR_OPERATION_ENUMERATE_BUS: |
1196 | stor_device = get_in_stor_device(device); | |
1197 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1198 | if (!work) | |
1199 | return; | |
1200 | ||
2a09ed3d | 1201 | INIT_WORK(&work->work, storvsc_host_scan); |
12675799 S |
1202 | work->host = stor_device->host; |
1203 | schedule_work(&work->work); | |
1204 | break; | |
8dcf37d4 S |
1205 | |
1206 | default: | |
1207 | break; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static void storvsc_on_channel_callback(void *context) | |
1212 | { | |
6f94d5de S |
1213 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1214 | struct hv_device *device; | |
8dcf37d4 S |
1215 | struct storvsc_device *stor_device; |
1216 | u32 bytes_recvd; | |
1217 | u64 request_id; | |
1218 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1219 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1220 | int ret; |
1221 | ||
6f94d5de S |
1222 | if (channel->primary_channel != NULL) |
1223 | device = channel->primary_channel->device_obj; | |
1224 | else | |
1225 | device = channel->device_obj; | |
8dcf37d4 S |
1226 | |
1227 | stor_device = get_in_stor_device(device); | |
1228 | if (!stor_device) | |
1229 | return; | |
1230 | ||
1231 | do { | |
6f94d5de | 1232 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1233 | ALIGN((sizeof(struct vstor_packet) - |
1234 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1235 | &bytes_recvd, &request_id); |
1236 | if (ret == 0 && bytes_recvd > 0) { | |
1237 | ||
61eaffc9 | 1238 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1239 | (unsigned long)request_id; |
1240 | ||
1241 | if ((request == &stor_device->init_request) || | |
1242 | (request == &stor_device->reset_request)) { | |
1243 | ||
1244 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1245 | (sizeof(struct vstor_packet) - |
1246 | vmscsi_size_delta)); | |
8dcf37d4 S |
1247 | complete(&request->wait_event); |
1248 | } else { | |
1249 | storvsc_on_receive(device, | |
1250 | (struct vstor_packet *)packet, | |
1251 | request); | |
1252 | } | |
1253 | } else { | |
1254 | break; | |
1255 | } | |
1256 | } while (1); | |
1257 | ||
1258 | return; | |
1259 | } | |
1260 | ||
1261 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1262 | { | |
1263 | struct vmstorage_channel_properties props; | |
1264 | int ret; | |
1265 | ||
1266 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1267 | ||
8dcf37d4 S |
1268 | ret = vmbus_open(device->channel, |
1269 | ring_size, | |
1270 | ring_size, | |
1271 | (void *)&props, | |
1272 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1273 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1274 | |
1275 | if (ret != 0) | |
1276 | return ret; | |
1277 | ||
1278 | ret = storvsc_channel_init(device); | |
1279 | ||
1280 | return ret; | |
1281 | } | |
1282 | ||
c1b3d067 | 1283 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1284 | { |
1285 | struct storvsc_device *stor_device; | |
1286 | unsigned long flags; | |
1287 | ||
cd654ea1 | 1288 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1289 | |
1290 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1291 | stor_device->destroy = true; | |
1292 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1293 | ||
1294 | /* | |
1295 | * At this point, all outbound traffic should be disable. We | |
1296 | * only allow inbound traffic (responses) to proceed so that | |
1297 | * outstanding requests can be completed. | |
1298 | */ | |
1299 | ||
1300 | storvsc_wait_to_drain(stor_device); | |
1301 | ||
1302 | /* | |
1303 | * Since we have already drained, we don't need to busy wait | |
1304 | * as was done in final_release_stor_device() | |
1305 | * Note that we cannot set the ext pointer to NULL until | |
1306 | * we have drained - to drain the outgoing packets, we need to | |
1307 | * allow incoming packets. | |
1308 | */ | |
1309 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1310 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1311 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1312 | ||
1313 | /* Close the channel */ | |
1314 | vmbus_close(device->channel); | |
1315 | ||
1316 | kfree(stor_device); | |
1317 | return 0; | |
1318 | } | |
1319 | ||
c1b3d067 | 1320 | static int storvsc_do_io(struct hv_device *device, |
61eaffc9 | 1321 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1322 | { |
1323 | struct storvsc_device *stor_device; | |
1324 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1325 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 S |
1326 | int ret = 0; |
1327 | ||
1328 | vstor_packet = &request->vstor_packet; | |
1329 | stor_device = get_out_stor_device(device); | |
1330 | ||
1331 | if (!stor_device) | |
1332 | return -ENODEV; | |
1333 | ||
1334 | ||
1335 | request->device = device; | |
6f94d5de S |
1336 | /* |
1337 | * Select an an appropriate channel to send the request out. | |
1338 | */ | |
1339 | ||
1340 | outgoing_channel = vmbus_get_outgoing_channel(device->channel); | |
8dcf37d4 S |
1341 | |
1342 | ||
1343 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1344 | ||
8b612fa2 S |
1345 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1346 | vmscsi_size_delta); | |
8dcf37d4 S |
1347 | |
1348 | ||
8b612fa2 | 1349 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1350 | |
1351 | ||
1352 | vstor_packet->vm_srb.data_transfer_length = | |
1353 | request->data_buffer.len; | |
1354 | ||
1355 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1356 | ||
1357 | if (request->data_buffer.len) { | |
6f94d5de | 1358 | ret = vmbus_sendpacket_multipagebuffer(outgoing_channel, |
8dcf37d4 S |
1359 | &request->data_buffer, |
1360 | vstor_packet, | |
8b612fa2 S |
1361 | (sizeof(struct vstor_packet) - |
1362 | vmscsi_size_delta), | |
8dcf37d4 S |
1363 | (unsigned long)request); |
1364 | } else { | |
1365 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1366 | (sizeof(struct vstor_packet) - |
1367 | vmscsi_size_delta), | |
8dcf37d4 S |
1368 | (unsigned long)request, |
1369 | VM_PKT_DATA_INBAND, | |
1370 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1371 | } | |
1372 | ||
1373 | if (ret != 0) | |
1374 | return ret; | |
1375 | ||
1376 | atomic_inc(&stor_device->num_outstanding_req); | |
1377 | ||
1378 | return ret; | |
1379 | } | |
1380 | ||
419f2d03 S |
1381 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1382 | { | |
419f2d03 | 1383 | |
419f2d03 S |
1384 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
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 | ||
3e8f4f40 OH |
1390 | sdevice->no_write_same = 1; |
1391 | ||
f3cfabce S |
1392 | /* |
1393 | * Add blist flags to permit the reading of the VPD pages even when | |
1394 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1395 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1396 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1397 | */ | |
1398 | sdevice->sdev_bflags |= msft_blist_flags; | |
1399 | ||
b0a93d96 S |
1400 | /* |
1401 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
1402 | * if the device is a MSFT virtual device. | |
1403 | */ | |
1404 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
1405 | switch (vmbus_proto_version) { | |
1406 | case VERSION_WIN8: | |
1407 | case VERSION_WIN8_1: | |
1408 | sdevice->scsi_level = SCSI_SPC_3; | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | ||
419f2d03 S |
1413 | return 0; |
1414 | } | |
1415 | ||
62838ce2 S |
1416 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1417 | sector_t capacity, int *info) | |
1418 | { | |
5326fd5c S |
1419 | sector_t nsect = capacity; |
1420 | sector_t cylinders = nsect; | |
1421 | int heads, sectors_pt; | |
62838ce2 | 1422 | |
5326fd5c S |
1423 | /* |
1424 | * We are making up these values; let us keep it simple. | |
1425 | */ | |
1426 | heads = 0xff; | |
1427 | sectors_pt = 0x3f; /* Sectors per track */ | |
1428 | sector_div(cylinders, heads * sectors_pt); | |
1429 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1430 | cylinders = 0xffff; | |
62838ce2 S |
1431 | |
1432 | info[0] = heads; | |
5326fd5c S |
1433 | info[1] = sectors_pt; |
1434 | info[2] = (int)cylinders; | |
62838ce2 | 1435 | |
62838ce2 S |
1436 | return 0; |
1437 | } | |
aa3d789e | 1438 | |
4b270c8b | 1439 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1440 | { |
4b270c8b S |
1441 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1442 | struct hv_device *device = host_dev->dev; | |
1443 | ||
aa3d789e | 1444 | struct storvsc_device *stor_device; |
61eaffc9 | 1445 | struct storvsc_cmd_request *request; |
aa3d789e S |
1446 | struct vstor_packet *vstor_packet; |
1447 | int ret, t; | |
1448 | ||
aa3d789e | 1449 | |
1eaaddf9 | 1450 | stor_device = get_out_stor_device(device); |
aa3d789e | 1451 | if (!stor_device) |
a00e8224 | 1452 | return FAILED; |
aa3d789e S |
1453 | |
1454 | request = &stor_device->reset_request; | |
1455 | vstor_packet = &request->vstor_packet; | |
1456 | ||
1457 | init_completion(&request->wait_event); | |
1458 | ||
1459 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1460 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1461 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1462 | ||
1463 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1464 | (sizeof(struct vstor_packet) - |
1465 | vmscsi_size_delta), | |
aa3d789e S |
1466 | (unsigned long)&stor_device->reset_request, |
1467 | VM_PKT_DATA_INBAND, | |
1468 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1469 | if (ret != 0) | |
a00e8224 | 1470 | return FAILED; |
aa3d789e | 1471 | |
46d2eb6d | 1472 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1473 | if (t == 0) |
1474 | return TIMEOUT_ERROR; | |
aa3d789e | 1475 | |
aa3d789e S |
1476 | |
1477 | /* | |
1478 | * At this point, all outstanding requests in the adapter | |
1479 | * should have been flushed out and return to us | |
5c1b10ab S |
1480 | * There is a potential race here where the host may be in |
1481 | * the process of responding when we return from here. | |
1482 | * Just wait for all in-transit packets to be accounted for | |
1483 | * before we return from here. | |
aa3d789e | 1484 | */ |
5c1b10ab | 1485 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1486 | |
a00e8224 | 1487 | return SUCCESS; |
aa3d789e S |
1488 | } |
1489 | ||
56b26e69 S |
1490 | /* |
1491 | * The host guarantees to respond to each command, although I/O latencies might | |
1492 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1493 | * chance to perform EH. | |
1494 | */ | |
1495 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1496 | { | |
1497 | return BLK_EH_RESET_TIMER; | |
1498 | } | |
1499 | ||
c77b63b6 | 1500 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1501 | { |
1502 | bool allowed = true; | |
1503 | u8 scsi_op = scmnd->cmnd[0]; | |
1504 | ||
1505 | switch (scsi_op) { | |
3e8f4f40 OH |
1506 | /* the host does not handle WRITE_SAME, log accident usage */ |
1507 | case WRITE_SAME: | |
c77b63b6 S |
1508 | /* |
1509 | * smartd sends this command and the host does not handle | |
1510 | * this. So, don't send it. | |
1511 | */ | |
41098f8f | 1512 | case SET_WINDOW: |
59e00e74 | 1513 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1514 | allowed = false; |
1515 | break; | |
1516 | default: | |
1517 | break; | |
92ae4ebd OH |
1518 | } |
1519 | return allowed; | |
1520 | } | |
c5b463ae | 1521 | |
bab445e1 | 1522 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1523 | { |
1524 | int ret; | |
bab445e1 | 1525 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1526 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1527 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1528 | int i; |
1529 | struct scatterlist *sgl; | |
1530 | unsigned int sg_count = 0; | |
1531 | struct vmscsi_request *vm_srb; | |
1532 | ||
8caf92d8 S |
1533 | if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) { |
1534 | /* | |
1535 | * On legacy hosts filter unimplemented commands. | |
1536 | * Future hosts are expected to correctly handle | |
1537 | * unsupported commands. Furthermore, it is | |
1538 | * possible that some of the currently | |
1539 | * unsupported commands maybe supported in | |
1540 | * future versions of the host. | |
1541 | */ | |
1542 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1543 | scmnd->scsi_done(scmnd); | |
1544 | return 0; | |
1545 | } | |
92ae4ebd | 1546 | } |
c5b463ae | 1547 | |
c5b463ae | 1548 | /* Setup the cmd request */ |
c5b463ae S |
1549 | cmd_request->cmd = scmnd; |
1550 | ||
61eaffc9 | 1551 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1552 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1553 | |
f885fb73 S |
1554 | vm_srb->win8_extension.srb_flags |= |
1555 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | | |
1556 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER); | |
c5b463ae S |
1557 | |
1558 | /* Build the SRB */ | |
1559 | switch (scmnd->sc_data_direction) { | |
1560 | case DMA_TO_DEVICE: | |
1561 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1562 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1563 | break; |
1564 | case DMA_FROM_DEVICE: | |
1565 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1566 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae S |
1567 | break; |
1568 | default: | |
1569 | vm_srb->data_in = UNKNOWN_TYPE; | |
f885fb73 S |
1570 | vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN | |
1571 | SRB_FLAGS_DATA_OUT); | |
c5b463ae S |
1572 | break; |
1573 | } | |
1574 | ||
c5b463ae | 1575 | |
c5b463ae S |
1576 | vm_srb->port_number = host_dev->port; |
1577 | vm_srb->path_id = scmnd->device->channel; | |
1578 | vm_srb->target_id = scmnd->device->id; | |
1579 | vm_srb->lun = scmnd->device->lun; | |
1580 | ||
c5b463ae S |
1581 | vm_srb->cdb_length = scmnd->cmd_len; |
1582 | ||
1583 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1584 | ||
61eaffc9 | 1585 | cmd_request->data_buffer.len = scsi_bufflen(scmnd); |
c5b463ae S |
1586 | if (scsi_sg_count(scmnd)) { |
1587 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1588 | sg_count = scsi_sg_count(scmnd); | |
1589 | ||
1590 | /* check if we need to bounce the sgl */ | |
1591 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1592 | cmd_request->bounce_sgl = | |
1593 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1594 | scsi_bufflen(scmnd), |
1595 | vm_srb->data_in); | |
ead3700d CH |
1596 | if (!cmd_request->bounce_sgl) |
1597 | return SCSI_MLQUEUE_HOST_BUSY; | |
c5b463ae S |
1598 | |
1599 | cmd_request->bounce_sgl_count = | |
1600 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1601 | PAGE_SHIFT; | |
1602 | ||
fa23b8c7 S |
1603 | if (vm_srb->data_in == WRITE_TYPE) |
1604 | copy_to_bounce_buffer(sgl, | |
1605 | cmd_request->bounce_sgl, | |
1606 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1607 | |
1608 | sgl = cmd_request->bounce_sgl; | |
1609 | sg_count = cmd_request->bounce_sgl_count; | |
1610 | } | |
1611 | ||
61eaffc9 | 1612 | cmd_request->data_buffer.offset = sgl[0].offset; |
c5b463ae S |
1613 | |
1614 | for (i = 0; i < sg_count; i++) | |
61eaffc9 | 1615 | cmd_request->data_buffer.pfn_array[i] = |
c5b463ae S |
1616 | page_to_pfn(sg_page((&sgl[i]))); |
1617 | ||
1618 | } else if (scsi_sglist(scmnd)) { | |
61eaffc9 | 1619 | cmd_request->data_buffer.offset = |
c5b463ae | 1620 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
61eaffc9 | 1621 | cmd_request->data_buffer.pfn_array[0] = |
c5b463ae S |
1622 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1623 | } | |
1624 | ||
c5b463ae | 1625 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1626 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1627 | |
d2598f01 | 1628 | if (ret == -EAGAIN) { |
c5b463ae S |
1629 | /* no more space */ |
1630 | ||
e86fb5e8 | 1631 | if (cmd_request->bounce_sgl_count) |
c5b463ae | 1632 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1633 | cmd_request->bounce_sgl_count); |
c5b463ae | 1634 | |
ead3700d | 1635 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1636 | } |
1637 | ||
c77b63b6 | 1638 | return 0; |
c5b463ae S |
1639 | } |
1640 | ||
bef4a34a | 1641 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1642 | .module = THIS_MODULE, |
1643 | .name = "storvsc_host_t", | |
ead3700d | 1644 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1645 | .bios_param = storvsc_get_chs, |
1646 | .queuecommand = storvsc_queuecommand, | |
1647 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1648 | .proc_name = "storvsc_host", |
56b26e69 | 1649 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1650 | .slave_configure = storvsc_device_configure, |
52f9614d | 1651 | .cmd_per_lun = 255, |
ff568d3a | 1652 | .this_id = -1, |
454f18a9 | 1653 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1654 | /* currently 32 */ |
1655 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1656 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1657 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1658 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1659 | .no_write_same = 1, |
bef4a34a HJ |
1660 | }; |
1661 | ||
ef52a81b S |
1662 | enum { |
1663 | SCSI_GUID, | |
1664 | IDE_GUID, | |
bde6d0f9 | 1665 | SFC_GUID, |
ef52a81b S |
1666 | }; |
1667 | ||
d847b5fe | 1668 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1669 | /* SCSI guid */ |
35c3bc20 S |
1670 | { HV_SCSI_GUID, |
1671 | .driver_data = SCSI_GUID | |
1672 | }, | |
21e37742 | 1673 | /* IDE guid */ |
35c3bc20 S |
1674 | { HV_IDE_GUID, |
1675 | .driver_data = IDE_GUID | |
1676 | }, | |
bde6d0f9 S |
1677 | /* Fibre Channel GUID */ |
1678 | { | |
1679 | HV_SYNTHFC_GUID, | |
1680 | .driver_data = SFC_GUID | |
1681 | }, | |
c45cf2d4 | 1682 | { }, |
d847b5fe | 1683 | }; |
bef4a34a | 1684 | |
d847b5fe | 1685 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1686 | |
84946899 S |
1687 | static int storvsc_probe(struct hv_device *device, |
1688 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1689 | { |
ff568d3a | 1690 | int ret; |
f458aada | 1691 | int num_cpus = num_online_cpus(); |
bef4a34a | 1692 | struct Scsi_Host *host; |
795b613d | 1693 | struct hv_host_device *host_dev; |
ef52a81b | 1694 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1695 | int target = 0; |
6e4198ce | 1696 | struct storvsc_device *stor_device; |
0fb8db29 S |
1697 | int max_luns_per_target; |
1698 | int max_targets; | |
1699 | int max_channels; | |
f458aada | 1700 | int max_sub_channels = 0; |
bd1f5d6a | 1701 | |
8b612fa2 S |
1702 | /* |
1703 | * Based on the windows host we are running on, | |
1704 | * set state to properly communicate with the host. | |
1705 | */ | |
1706 | ||
adb6f9e1 S |
1707 | switch (vmbus_proto_version) { |
1708 | case VERSION_WS2008: | |
1709 | case VERSION_WIN7: | |
8b612fa2 S |
1710 | sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
1711 | vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
1712 | vmstor_current_major = VMSTOR_WIN7_MAJOR; | |
1713 | vmstor_current_minor = VMSTOR_WIN7_MINOR; | |
0fb8db29 S |
1714 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1715 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1716 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
adb6f9e1 S |
1717 | break; |
1718 | default: | |
1719 | sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE; | |
1720 | vmscsi_size_delta = 0; | |
1721 | vmstor_current_major = VMSTOR_WIN8_MAJOR; | |
1722 | vmstor_current_minor = VMSTOR_WIN8_MINOR; | |
0fb8db29 S |
1723 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1724 | max_targets = STORVSC_MAX_TARGETS; | |
1725 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada S |
1726 | /* |
1727 | * On Windows8 and above, we support sub-channels for storage. | |
1728 | * The number of sub-channels offerred is based on the number of | |
1729 | * VCPUs in the guest. | |
1730 | */ | |
1731 | max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); | |
adb6f9e1 | 1732 | break; |
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; |
bef4a34a | 1748 | |
4e03e697 | 1749 | |
a13d35ab | 1750 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1751 | if (!stor_device) { |
225ce6ea | 1752 | ret = -ENOMEM; |
ce3e301c | 1753 | goto err_out0; |
6e4198ce | 1754 | } |
9efd21e1 | 1755 | |
a13d35ab | 1756 | stor_device->destroy = false; |
6f94d5de | 1757 | stor_device->open_sub_channel = false; |
a13d35ab S |
1758 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1759 | stor_device->device = device; | |
cd654ea1 S |
1760 | stor_device->host = host; |
1761 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1762 | |
6e4198ce S |
1763 | stor_device->port_number = host->host_no; |
1764 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1765 | if (ret) |
ce3e301c | 1766 | goto err_out1; |
bef4a34a | 1767 | |
6e4198ce S |
1768 | host_dev->path = stor_device->path_id; |
1769 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1770 | |
4cd83ecd S |
1771 | switch (dev_id->driver_data) { |
1772 | case SFC_GUID: | |
1773 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1774 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1775 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
1776 | break; | |
1777 | ||
1778 | case SCSI_GUID: | |
0fb8db29 S |
1779 | host->max_lun = max_luns_per_target; |
1780 | host->max_id = max_targets; | |
1781 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1782 | break; |
1783 | ||
1784 | default: | |
1785 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1786 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1787 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1788 | break; | |
1789 | } | |
cf55f4a8 MS |
1790 | /* max cmd length */ |
1791 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1792 | |
454f18a9 | 1793 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1794 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1795 | if (ret != 0) |
ce3e301c | 1796 | goto err_out2; |
bef4a34a | 1797 | |
bd1f5d6a S |
1798 | if (!dev_is_ide) { |
1799 | scsi_scan_host(host); | |
59d22950 S |
1800 | } else { |
1801 | target = (device->dev_instance.b[5] << 8 | | |
1802 | device->dev_instance.b[4]); | |
1803 | ret = scsi_add_device(host, 0, target, 0); | |
1804 | if (ret) { | |
1805 | scsi_remove_host(host); | |
1806 | goto err_out2; | |
1807 | } | |
bef4a34a | 1808 | } |
bd1f5d6a | 1809 | return 0; |
bef4a34a | 1810 | |
ce3e301c | 1811 | err_out2: |
225ce6ea S |
1812 | /* |
1813 | * Once we have connected with the host, we would need to | |
1814 | * to invoke storvsc_dev_remove() to rollback this state and | |
1815 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1816 | * err_out1 label. |
225ce6ea | 1817 | */ |
bd1f5d6a | 1818 | storvsc_dev_remove(device); |
ce3e301c | 1819 | goto err_out0; |
225ce6ea S |
1820 | |
1821 | err_out1: | |
ce3e301c | 1822 | kfree(stor_device); |
225ce6ea S |
1823 | |
1824 | err_out0: | |
bd1f5d6a | 1825 | scsi_host_put(host); |
225ce6ea | 1826 | return ret; |
bef4a34a HJ |
1827 | } |
1828 | ||
ddcbf65e S |
1829 | static int storvsc_remove(struct hv_device *dev) |
1830 | { | |
1831 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1832 | struct Scsi_Host *host = stor_device->host; | |
1833 | ||
1834 | scsi_remove_host(host); | |
1835 | storvsc_dev_remove(dev); | |
1836 | scsi_host_put(host); | |
1837 | ||
1838 | return 0; | |
1839 | } | |
1840 | ||
40bf63ed | 1841 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1842 | .name = KBUILD_MODNAME, |
d847b5fe | 1843 | .id_table = id_table, |
40bf63ed S |
1844 | .probe = storvsc_probe, |
1845 | .remove = storvsc_remove, | |
39ae6fae | 1846 | }; |
7bd05b91 | 1847 | |
d9bbae83 | 1848 | static int __init storvsc_drv_init(void) |
f5c78872 | 1849 | { |
01415ab3 S |
1850 | |
1851 | /* | |
1852 | * Divide the ring buffer data size (which is 1 page less | |
1853 | * than the ring buffer size since that page is reserved for | |
1854 | * the ring buffer indices) by the max request size (which is | |
1855 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1856 | */ | |
01415ab3 | 1857 | max_outstanding_req_per_channel = |
768fa219 GKH |
1858 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1859 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1860 | sizeof(struct vstor_packet) + sizeof(u64) - |
1861 | vmscsi_size_delta, | |
768fa219 | 1862 | sizeof(u64))); |
f5c78872 | 1863 | |
768fa219 | 1864 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1865 | } |
1866 | ||
c63ba9e1 | 1867 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1868 | { |
768fa219 | 1869 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1870 | } |
1871 | ||
ff568d3a | 1872 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1873 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1874 | module_init(storvsc_drv_init); |
c63ba9e1 | 1875 | module_exit(storvsc_drv_exit); |