Commit | Line | Data |
---|---|---|
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> |
4e03e697 | 35 | #include <linux/mempool.h> |
56b26e69 | 36 | #include <linux/blkdev.h> |
bef4a34a HJ |
37 | #include <scsi/scsi.h> |
38 | #include <scsi/scsi_cmnd.h> | |
39 | #include <scsi/scsi_host.h> | |
40 | #include <scsi/scsi_device.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <scsi/scsi_eh.h> | |
43 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 44 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 45 | |
09f0355f | 46 | /* |
af9584b8 S |
47 | * All wire protocol details (storage protocol between the guest and the host) |
48 | * are consolidated here. | |
49 | * | |
50 | * Begin protocol definitions. | |
09f0355f S |
51 | */ |
52 | ||
09f0355f S |
53 | /* |
54 | * Version history: | |
55 | * V1 Beta: 0.1 | |
56 | * V1 RC < 2008/1/31: 1.0 | |
57 | * V1 RC > 2008/1/31: 2.0 | |
58 | * Win7: 4.2 | |
8b612fa2 | 59 | * Win8: 5.1 |
09f0355f S |
60 | */ |
61 | ||
8b612fa2 S |
62 | |
63 | #define VMSTOR_WIN7_MAJOR 4 | |
64 | #define VMSTOR_WIN7_MINOR 2 | |
65 | ||
66 | #define VMSTOR_WIN8_MAJOR 5 | |
67 | #define VMSTOR_WIN8_MINOR 1 | |
f0d79fe9 S |
68 | |
69 | ||
f0d79fe9 S |
70 | /* Packet structure describing virtual storage requests. */ |
71 | enum vstor_packet_operation { | |
72 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
73 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
74 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
75 | VSTOR_OPERATION_RESET_LUN = 4, | |
76 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
77 | VSTOR_OPERATION_RESET_BUS = 6, | |
78 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
79 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
80 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
81 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 82 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
83 | VSTOR_OPERATION_FCHBA_DATA = 12, |
84 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
85 | VSTOR_OPERATION_MAXIMUM = 13 | |
86 | }; | |
87 | ||
88 | /* | |
89 | * WWN packet for Fibre Channel HBA | |
90 | */ | |
91 | ||
92 | struct hv_fc_wwn_packet { | |
93 | bool primary_active; | |
94 | u8 reserved1; | |
95 | u8 reserved2; | |
96 | u8 primary_port_wwn[8]; | |
97 | u8 primary_node_wwn[8]; | |
98 | u8 secondary_port_wwn[8]; | |
99 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
100 | }; |
101 | ||
8b612fa2 S |
102 | |
103 | ||
104 | /* | |
105 | * SRB Flag Bits | |
106 | */ | |
107 | ||
108 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
109 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
110 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
111 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
112 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
113 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
114 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
115 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
116 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
117 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
118 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
119 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
120 | ||
121 | /* | |
122 | * This flag indicates the request is part of the workflow for processing a D3. | |
123 | */ | |
124 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
125 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
126 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
127 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
128 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
129 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
130 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
131 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
132 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
133 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
134 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
135 | ||
136 | ||
f0d79fe9 S |
137 | /* |
138 | * Platform neutral description of a scsi request - | |
139 | * this remains the same across the write regardless of 32/64 bit | |
140 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
141 | */ | |
6b2f9495 | 142 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
143 | |
144 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
145 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
146 | ||
147 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 148 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 149 | |
8b612fa2 S |
150 | /* |
151 | * Sense buffer size changed in win8; have a run-time | |
152 | * variable to track the size we should use. | |
153 | */ | |
154 | static int sense_buffer_size; | |
155 | ||
156 | /* | |
157 | * The size of the vmscsi_request has changed in win8. The | |
158 | * additional size is because of new elements added to the | |
159 | * structure. These elements are valid only when we are talking | |
160 | * to a win8 host. | |
161 | * Track the correction to size we need to apply. | |
162 | */ | |
163 | ||
164 | static int vmscsi_size_delta; | |
165 | static int vmstor_current_major; | |
166 | static int vmstor_current_minor; | |
167 | ||
168 | struct vmscsi_win8_extension { | |
169 | /* | |
170 | * The following were added in Windows 8 | |
171 | */ | |
172 | u16 reserve; | |
173 | u8 queue_tag; | |
174 | u8 queue_action; | |
175 | u32 srb_flags; | |
176 | u32 time_out_value; | |
177 | u32 queue_sort_ey; | |
178 | } __packed; | |
179 | ||
f0d79fe9 | 180 | struct vmscsi_request { |
c649114a S |
181 | u16 length; |
182 | u8 srb_status; | |
183 | u8 scsi_status; | |
f0d79fe9 | 184 | |
c649114a S |
185 | u8 port_number; |
186 | u8 path_id; | |
187 | u8 target_id; | |
188 | u8 lun; | |
f0d79fe9 | 189 | |
c649114a S |
190 | u8 cdb_length; |
191 | u8 sense_info_length; | |
192 | u8 data_in; | |
193 | u8 reserved; | |
f0d79fe9 | 194 | |
c649114a | 195 | u32 data_transfer_length; |
f0d79fe9 S |
196 | |
197 | union { | |
6b2f9495 S |
198 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
199 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
200 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 201 | }; |
8b612fa2 S |
202 | /* |
203 | * The following was added in win8. | |
204 | */ | |
205 | struct vmscsi_win8_extension win8_extension; | |
206 | ||
f0d79fe9 S |
207 | } __attribute((packed)); |
208 | ||
209 | ||
210 | /* | |
211 | * This structure is sent during the intialization phase to get the different | |
212 | * properties of the channel. | |
213 | */ | |
8b612fa2 S |
214 | |
215 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
216 | ||
f0d79fe9 | 217 | struct vmstorage_channel_properties { |
8b612fa2 S |
218 | u32 reserved; |
219 | u16 max_channel_cnt; | |
220 | u16 reserved1; | |
f0d79fe9 | 221 | |
8b612fa2 | 222 | u32 flags; |
c649114a | 223 | u32 max_transfer_bytes; |
f0d79fe9 | 224 | |
8b612fa2 | 225 | u64 reserved2; |
f0d79fe9 S |
226 | } __packed; |
227 | ||
228 | /* This structure is sent during the storage protocol negotiations. */ | |
229 | struct vmstorage_protocol_version { | |
230 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 231 | u16 major_minor; |
f0d79fe9 S |
232 | |
233 | /* | |
234 | * Revision number is auto-incremented whenever this file is changed | |
235 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
236 | * definitely indicate incompatibility--but it does indicate mismatched | |
237 | * builds. | |
c649114a | 238 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 239 | */ |
85904a5e | 240 | u16 revision; |
f0d79fe9 S |
241 | } __packed; |
242 | ||
243 | /* Channel Property Flags */ | |
244 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
245 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
246 | ||
247 | struct vstor_packet { | |
248 | /* Requested operation type */ | |
249 | enum vstor_packet_operation operation; | |
250 | ||
251 | /* Flags - see below for values */ | |
c649114a | 252 | u32 flags; |
f0d79fe9 S |
253 | |
254 | /* Status of the request returned from the server side. */ | |
c649114a | 255 | u32 status; |
f0d79fe9 S |
256 | |
257 | /* Data payload area */ | |
258 | union { | |
259 | /* | |
260 | * Structure used to forward SCSI commands from the | |
261 | * client to the server. | |
262 | */ | |
263 | struct vmscsi_request vm_srb; | |
264 | ||
265 | /* Structure used to query channel properties. */ | |
266 | struct vmstorage_channel_properties storage_channel_properties; | |
267 | ||
268 | /* Used during version negotiations. */ | |
269 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
270 | |
271 | /* Fibre channel address packet */ | |
272 | struct hv_fc_wwn_packet wwn_packet; | |
273 | ||
274 | /* Number of sub-channels to create */ | |
275 | u16 sub_channel_count; | |
276 | ||
277 | /* This will be the maximum of the union members */ | |
278 | u8 buffer[0x34]; | |
f0d79fe9 S |
279 | }; |
280 | } __packed; | |
281 | ||
f0d79fe9 | 282 | /* |
09f0355f S |
283 | * Packet Flags: |
284 | * | |
f0d79fe9 S |
285 | * This flag indicates that the server should send back a completion for this |
286 | * packet. | |
287 | */ | |
09f0355f | 288 | |
f0d79fe9 S |
289 | #define REQUEST_COMPLETION_FLAG 0x1 |
290 | ||
f0d79fe9 S |
291 | /* Matches Windows-end */ |
292 | enum storvsc_request_type { | |
c649114a | 293 | WRITE_TYPE = 0, |
f0d79fe9 S |
294 | READ_TYPE, |
295 | UNKNOWN_TYPE, | |
296 | }; | |
297 | ||
16046320 S |
298 | /* |
299 | * SRB status codes and masks; a subset of the codes used here. | |
300 | */ | |
301 | ||
302 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
303 | #define SRB_STATUS_INVALID_LUN 0x20 | |
304 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 305 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
306 | #define SRB_STATUS_ERROR 0x04 |
307 | ||
af9584b8 S |
308 | /* |
309 | * This is the end of Protocol specific defines. | |
310 | */ | |
311 | ||
312 | ||
313 | /* | |
314 | * We setup a mempool to allocate request structures for this driver | |
315 | * on a per-lun basis. The following define specifies the number of | |
316 | * elements in the pool. | |
317 | */ | |
318 | ||
319 | #define STORVSC_MIN_BUF_NR 64 | |
320 | static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); | |
321 | ||
322 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
323 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
324 | ||
893def38 S |
325 | /* |
326 | * Timeout in seconds for all devices managed by this driver. | |
327 | */ | |
328 | static int storvsc_timeout = 180; | |
329 | ||
f3cfabce S |
330 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
331 | ||
bb6a4df6 | 332 | #define STORVSC_MAX_IO_REQUESTS 200 |
af9584b8 | 333 | |
6f94d5de S |
334 | static void storvsc_on_channel_callback(void *context); |
335 | ||
4cd83ecd S |
336 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
337 | #define STORVSC_MAX_TARGETS 2 | |
338 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 339 | |
4cd83ecd S |
340 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
341 | #define STORVSC_FC_MAX_TARGETS 128 | |
342 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 343 | |
4cd83ecd S |
344 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
345 | #define STORVSC_IDE_MAX_TARGETS 1 | |
346 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 347 | |
61eaffc9 S |
348 | struct storvsc_cmd_request { |
349 | struct list_head entry; | |
350 | struct scsi_cmnd *cmd; | |
351 | ||
352 | unsigned int bounce_sgl_count; | |
353 | struct scatterlist *bounce_sgl; | |
f0d79fe9 | 354 | |
f0d79fe9 S |
355 | struct hv_device *device; |
356 | ||
357 | /* Synchronize the request/response if needed */ | |
358 | struct completion wait_event; | |
359 | ||
360 | unsigned char *sense_buffer; | |
f0d79fe9 | 361 | struct hv_multipage_buffer data_buffer; |
f0d79fe9 S |
362 | struct vstor_packet vstor_packet; |
363 | }; | |
364 | ||
365 | ||
f0d79fe9 S |
366 | /* A storvsc device is a device object that contains a vmbus channel */ |
367 | struct storvsc_device { | |
368 | struct hv_device *device; | |
369 | ||
370 | bool destroy; | |
371 | bool drain_notify; | |
6f94d5de | 372 | bool open_sub_channel; |
f0d79fe9 | 373 | atomic_t num_outstanding_req; |
cd654ea1 | 374 | struct Scsi_Host *host; |
f0d79fe9 S |
375 | |
376 | wait_queue_head_t waiting_to_drain; | |
377 | ||
378 | /* | |
379 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
380 | * controller. In reality, the pathid, targetid is always 0 | |
381 | * and the port is set by us | |
382 | */ | |
383 | unsigned int port_number; | |
384 | unsigned char path_id; | |
385 | unsigned char target_id; | |
386 | ||
387 | /* Used for vsc/vsp channel reset process */ | |
61eaffc9 S |
388 | struct storvsc_cmd_request init_request; |
389 | struct storvsc_cmd_request reset_request; | |
f0d79fe9 S |
390 | }; |
391 | ||
ce3e301c | 392 | struct stor_mem_pools { |
c1b3d067 | 393 | struct kmem_cache *request_pool; |
4e03e697 | 394 | mempool_t *request_mempool; |
ce3e301c S |
395 | }; |
396 | ||
397 | struct hv_host_device { | |
398 | struct hv_device *dev; | |
c1b3d067 S |
399 | unsigned int port; |
400 | unsigned char path; | |
401 | unsigned char target; | |
402 | }; | |
403 | ||
12675799 S |
404 | struct storvsc_scan_work { |
405 | struct work_struct work; | |
406 | struct Scsi_Host *host; | |
407 | uint lun; | |
408 | }; | |
409 | ||
6781209e S |
410 | static void storvsc_device_scan(struct work_struct *work) |
411 | { | |
412 | struct storvsc_scan_work *wrk; | |
413 | uint lun; | |
414 | struct scsi_device *sdev; | |
415 | ||
416 | wrk = container_of(work, struct storvsc_scan_work, work); | |
417 | lun = wrk->lun; | |
418 | ||
419 | sdev = scsi_device_lookup(wrk->host, 0, 0, lun); | |
420 | if (!sdev) | |
421 | goto done; | |
422 | scsi_rescan_device(&sdev->sdev_gendev); | |
423 | scsi_device_put(sdev); | |
424 | ||
425 | done: | |
426 | kfree(wrk); | |
427 | } | |
428 | ||
12675799 S |
429 | static void storvsc_bus_scan(struct work_struct *work) |
430 | { | |
431 | struct storvsc_scan_work *wrk; | |
432 | int id, order_id; | |
433 | ||
434 | wrk = container_of(work, struct storvsc_scan_work, work); | |
435 | for (id = 0; id < wrk->host->max_id; ++id) { | |
436 | if (wrk->host->reverse_ordering) | |
437 | order_id = wrk->host->max_id - id - 1; | |
438 | else | |
439 | order_id = id; | |
440 | ||
441 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
442 | order_id, SCAN_WILD_CARD, 1); | |
443 | } | |
444 | kfree(wrk); | |
445 | } | |
446 | ||
b4017319 S |
447 | static void storvsc_remove_lun(struct work_struct *work) |
448 | { | |
449 | struct storvsc_scan_work *wrk; | |
450 | struct scsi_device *sdev; | |
451 | ||
452 | wrk = container_of(work, struct storvsc_scan_work, work); | |
453 | if (!scsi_host_get(wrk->host)) | |
454 | goto done; | |
455 | ||
456 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
457 | ||
458 | if (sdev) { | |
459 | scsi_remove_device(sdev); | |
460 | scsi_device_put(sdev); | |
461 | } | |
462 | scsi_host_put(wrk->host); | |
463 | ||
464 | done: | |
465 | kfree(wrk); | |
466 | } | |
467 | ||
af9584b8 S |
468 | /* |
469 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
470 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
471 | */ | |
472 | ||
473 | static inline u16 storvsc_get_version(u8 major, u8 minor) | |
474 | { | |
475 | u16 version; | |
476 | ||
477 | version = ((major << 8) | minor); | |
478 | return version; | |
479 | } | |
480 | ||
a8c18c57 S |
481 | /* |
482 | * We can get incoming messages from the host that are not in response to | |
483 | * messages that we have sent out. An example of this would be messages | |
484 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
485 | * deal with potential race conditions where the driver may be in the | |
486 | * midst of being unloaded when we might receive an unsolicited message | |
487 | * from the host, we have implemented a mechanism to gurantee sequential | |
488 | * consistency: | |
489 | * | |
490 | * 1) Once the device is marked as being destroyed, we will fail all | |
491 | * outgoing messages. | |
492 | * 2) We permit incoming messages when the device is being destroyed, | |
493 | * only to properly account for messages already sent out. | |
494 | */ | |
495 | ||
f0d79fe9 S |
496 | static inline struct storvsc_device *get_out_stor_device( |
497 | struct hv_device *device) | |
498 | { | |
499 | struct storvsc_device *stor_device; | |
500 | ||
cd654ea1 | 501 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
502 | |
503 | if (stor_device && stor_device->destroy) | |
504 | stor_device = NULL; | |
505 | ||
506 | return stor_device; | |
507 | } | |
508 | ||
509 | ||
510 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
511 | { | |
512 | dev->drain_notify = true; | |
513 | wait_event(dev->waiting_to_drain, | |
514 | atomic_read(&dev->num_outstanding_req) == 0); | |
515 | dev->drain_notify = false; | |
516 | } | |
bef4a34a | 517 | |
8dcf37d4 S |
518 | static inline struct storvsc_device *get_in_stor_device( |
519 | struct hv_device *device) | |
520 | { | |
521 | struct storvsc_device *stor_device; | |
8dcf37d4 | 522 | |
cd654ea1 | 523 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
524 | |
525 | if (!stor_device) | |
526 | goto get_in_err; | |
527 | ||
528 | /* | |
529 | * If the device is being destroyed; allow incoming | |
530 | * traffic only to cleanup outstanding requests. | |
531 | */ | |
532 | ||
533 | if (stor_device->destroy && | |
534 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
535 | stor_device = NULL; | |
536 | ||
537 | get_in_err: | |
8dcf37d4 S |
538 | return stor_device; |
539 | ||
540 | } | |
541 | ||
2707388c S |
542 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
543 | unsigned int sg_count) | |
544 | { | |
545 | int i; | |
546 | struct page *page_buf; | |
547 | ||
548 | for (i = 0; i < sg_count; i++) { | |
549 | page_buf = sg_page((&sgl[i])); | |
550 | if (page_buf != NULL) | |
551 | __free_page(page_buf); | |
552 | } | |
553 | ||
554 | kfree(sgl); | |
555 | } | |
556 | ||
557 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
558 | { | |
559 | int i; | |
560 | ||
561 | /* No need to check */ | |
562 | if (sg_count < 2) | |
563 | return -1; | |
564 | ||
565 | /* We have at least 2 sg entries */ | |
566 | for (i = 0; i < sg_count; i++) { | |
567 | if (i == 0) { | |
568 | /* make sure 1st one does not have hole */ | |
569 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
570 | return i; | |
571 | } else if (i == sg_count - 1) { | |
572 | /* make sure last one does not have hole */ | |
573 | if (sgl[i].offset != 0) | |
574 | return i; | |
575 | } else { | |
576 | /* make sure no hole in the middle */ | |
577 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
578 | return i; | |
579 | } | |
580 | } | |
581 | return -1; | |
582 | } | |
583 | ||
584 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
585 | unsigned int sg_count, | |
586 | unsigned int len, | |
587 | int write) | |
588 | { | |
589 | int i; | |
590 | int num_pages; | |
591 | struct scatterlist *bounce_sgl; | |
592 | struct page *page_buf; | |
593 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
594 | ||
595 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
596 | ||
597 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
598 | if (!bounce_sgl) | |
599 | return NULL; | |
600 | ||
9d2696e6 | 601 | sg_init_table(bounce_sgl, num_pages); |
2707388c S |
602 | for (i = 0; i < num_pages; i++) { |
603 | page_buf = alloc_page(GFP_ATOMIC); | |
604 | if (!page_buf) | |
605 | goto cleanup; | |
606 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
607 | } | |
608 | ||
609 | return bounce_sgl; | |
610 | ||
611 | cleanup: | |
612 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
613 | return NULL; | |
614 | } | |
615 | ||
9f393834 LT |
616 | /* Disgusting wrapper functions */ |
617 | static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) | |
618 | { | |
619 | void *addr = kmap_atomic(sg_page(sgl + idx)); | |
620 | return (unsigned long)addr; | |
621 | } | |
8dcf37d4 | 622 | |
9f393834 LT |
623 | static inline void sg_kunmap_atomic(unsigned long addr) |
624 | { | |
625 | kunmap_atomic((void *)addr); | |
626 | } | |
8dcf37d4 | 627 | |
8dcf37d4 | 628 | |
2707388c S |
629 | /* Assume the original sgl has enough room */ |
630 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
631 | struct scatterlist *bounce_sgl, | |
632 | unsigned int orig_sgl_count, | |
633 | unsigned int bounce_sgl_count) | |
634 | { | |
635 | int i; | |
636 | int j = 0; | |
637 | unsigned long src, dest; | |
638 | unsigned int srclen, destlen, copylen; | |
639 | unsigned int total_copied = 0; | |
640 | unsigned long bounce_addr = 0; | |
641 | unsigned long dest_addr = 0; | |
642 | unsigned long flags; | |
643 | ||
644 | local_irq_save(flags); | |
645 | ||
646 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 647 | dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
648 | dest = dest_addr; |
649 | destlen = orig_sgl[i].length; | |
650 | ||
651 | if (bounce_addr == 0) | |
9f393834 | 652 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
653 | |
654 | while (destlen) { | |
655 | src = bounce_addr + bounce_sgl[j].offset; | |
656 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
657 | ||
658 | copylen = min(srclen, destlen); | |
659 | memcpy((void *)dest, (void *)src, copylen); | |
660 | ||
661 | total_copied += copylen; | |
662 | bounce_sgl[j].offset += copylen; | |
663 | destlen -= copylen; | |
664 | dest += copylen; | |
665 | ||
666 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
667 | /* full */ | |
9f393834 | 668 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
669 | j++; |
670 | ||
671 | /* | |
672 | * It is possible that the number of elements | |
673 | * in the bounce buffer may not be equal to | |
674 | * the number of elements in the original | |
675 | * scatter list. Handle this correctly. | |
676 | */ | |
677 | ||
678 | if (j == bounce_sgl_count) { | |
679 | /* | |
680 | * We are done; cleanup and return. | |
681 | */ | |
9f393834 | 682 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
683 | local_irq_restore(flags); |
684 | return total_copied; | |
685 | } | |
686 | ||
687 | /* if we need to use another bounce buffer */ | |
688 | if (destlen || i != orig_sgl_count - 1) | |
9f393834 | 689 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
690 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
691 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 692 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
693 | } |
694 | } | |
695 | ||
9f393834 | 696 | sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); |
2707388c S |
697 | } |
698 | ||
699 | local_irq_restore(flags); | |
700 | ||
701 | return total_copied; | |
702 | } | |
703 | ||
704 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
705 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
706 | struct scatterlist *bounce_sgl, | |
707 | unsigned int orig_sgl_count) | |
708 | { | |
709 | int i; | |
710 | int j = 0; | |
711 | unsigned long src, dest; | |
712 | unsigned int srclen, destlen, copylen; | |
713 | unsigned int total_copied = 0; | |
714 | unsigned long bounce_addr = 0; | |
715 | unsigned long src_addr = 0; | |
716 | unsigned long flags; | |
717 | ||
718 | local_irq_save(flags); | |
719 | ||
720 | for (i = 0; i < orig_sgl_count; i++) { | |
9f393834 | 721 | src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; |
2707388c S |
722 | src = src_addr; |
723 | srclen = orig_sgl[i].length; | |
724 | ||
725 | if (bounce_addr == 0) | |
9f393834 | 726 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
727 | |
728 | while (srclen) { | |
729 | /* assume bounce offset always == 0 */ | |
730 | dest = bounce_addr + bounce_sgl[j].length; | |
731 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
732 | ||
733 | copylen = min(srclen, destlen); | |
734 | memcpy((void *)dest, (void *)src, copylen); | |
735 | ||
736 | total_copied += copylen; | |
737 | bounce_sgl[j].length += copylen; | |
738 | srclen -= copylen; | |
739 | src += copylen; | |
740 | ||
741 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
742 | /* full..move to next entry */ | |
9f393834 | 743 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
744 | j++; |
745 | ||
746 | /* if we need to use another bounce buffer */ | |
747 | if (srclen || i != orig_sgl_count - 1) | |
9f393834 | 748 | bounce_addr = sg_kmap_atomic(bounce_sgl,j); |
2707388c S |
749 | |
750 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
751 | /* unmap the last bounce that is < PAGE_SIZE */ | |
9f393834 | 752 | sg_kunmap_atomic(bounce_addr); |
2707388c S |
753 | } |
754 | } | |
755 | ||
9f393834 | 756 | sg_kunmap_atomic(src_addr - orig_sgl[i].offset); |
2707388c S |
757 | } |
758 | ||
759 | local_irq_restore(flags); | |
760 | ||
761 | return total_copied; | |
762 | } | |
763 | ||
6f94d5de S |
764 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
765 | { | |
766 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
767 | struct storvsc_device *stor_device; | |
768 | struct vmstorage_channel_properties props; | |
769 | ||
770 | stor_device = get_out_stor_device(device); | |
771 | if (!stor_device) | |
772 | return; | |
773 | ||
774 | if (stor_device->open_sub_channel == false) | |
775 | return; | |
776 | ||
777 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
778 | ||
779 | vmbus_open(new_sc, | |
780 | storvsc_ringbuffer_size, | |
781 | storvsc_ringbuffer_size, | |
782 | (void *)&props, | |
783 | sizeof(struct vmstorage_channel_properties), | |
784 | storvsc_on_channel_callback, new_sc); | |
785 | } | |
786 | ||
787 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
788 | { | |
789 | struct storvsc_device *stor_device; | |
790 | int num_cpus = num_online_cpus(); | |
791 | int num_sc; | |
792 | struct storvsc_cmd_request *request; | |
793 | struct vstor_packet *vstor_packet; | |
794 | int ret, t; | |
795 | ||
796 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
797 | stor_device = get_out_stor_device(device); | |
798 | if (!stor_device) | |
799 | return; | |
800 | ||
801 | request = &stor_device->init_request; | |
802 | vstor_packet = &request->vstor_packet; | |
803 | ||
804 | stor_device->open_sub_channel = true; | |
805 | /* | |
806 | * Establish a handler for dealing with subchannels. | |
807 | */ | |
808 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
809 | ||
810 | /* | |
811 | * Check to see if sub-channels have already been created. This | |
812 | * can happen when this driver is re-loaded after unloading. | |
813 | */ | |
814 | ||
815 | if (vmbus_are_subchannels_present(device->channel)) | |
816 | return; | |
817 | ||
818 | stor_device->open_sub_channel = false; | |
819 | /* | |
820 | * Request the host to create sub-channels. | |
821 | */ | |
822 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
823 | init_completion(&request->wait_event); | |
824 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
825 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
826 | vstor_packet->sub_channel_count = num_sc; | |
827 | ||
828 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
829 | (sizeof(struct vstor_packet) - | |
830 | vmscsi_size_delta), | |
831 | (unsigned long)request, | |
832 | VM_PKT_DATA_INBAND, | |
833 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
834 | ||
835 | if (ret != 0) | |
836 | return; | |
837 | ||
838 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
839 | if (t == 0) | |
840 | return; | |
841 | ||
842 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
843 | vstor_packet->status != 0) | |
844 | return; | |
845 | ||
846 | /* | |
847 | * Now that we created the sub-channels, invoke the check; this | |
848 | * may trigger the callback. | |
849 | */ | |
850 | stor_device->open_sub_channel = true; | |
851 | vmbus_are_subchannels_present(device->channel); | |
852 | } | |
853 | ||
8dcf37d4 S |
854 | static int storvsc_channel_init(struct hv_device *device) |
855 | { | |
856 | struct storvsc_device *stor_device; | |
61eaffc9 | 857 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
858 | struct vstor_packet *vstor_packet; |
859 | int ret, t; | |
6f94d5de S |
860 | int max_chns; |
861 | bool process_sub_channels = false; | |
8dcf37d4 S |
862 | |
863 | stor_device = get_out_stor_device(device); | |
864 | if (!stor_device) | |
865 | return -ENODEV; | |
866 | ||
867 | request = &stor_device->init_request; | |
868 | vstor_packet = &request->vstor_packet; | |
869 | ||
870 | /* | |
871 | * Now, initiate the vsc/vsp initialization protocol on the open | |
872 | * channel | |
873 | */ | |
61eaffc9 | 874 | memset(request, 0, sizeof(struct storvsc_cmd_request)); |
8dcf37d4 S |
875 | init_completion(&request->wait_event); |
876 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
877 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
878 | ||
879 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
880 | (sizeof(struct vstor_packet) - |
881 | vmscsi_size_delta), | |
8dcf37d4 S |
882 | (unsigned long)request, |
883 | VM_PKT_DATA_INBAND, | |
884 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
885 | if (ret != 0) | |
886 | goto cleanup; | |
887 | ||
888 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
889 | if (t == 0) { | |
890 | ret = -ETIMEDOUT; | |
891 | goto cleanup; | |
892 | } | |
893 | ||
894 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
895 | vstor_packet->status != 0) | |
896 | goto cleanup; | |
897 | ||
898 | ||
899 | /* reuse the packet for version range supported */ | |
900 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
901 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
902 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
903 | ||
85904a5e | 904 | vstor_packet->version.major_minor = |
8b612fa2 | 905 | storvsc_get_version(vmstor_current_major, vmstor_current_minor); |
85904a5e S |
906 | |
907 | /* | |
908 | * The revision number is only used in Windows; set it to 0. | |
909 | */ | |
c649114a | 910 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
911 | |
912 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
913 | (sizeof(struct vstor_packet) - |
914 | vmscsi_size_delta), | |
8dcf37d4 S |
915 | (unsigned long)request, |
916 | VM_PKT_DATA_INBAND, | |
917 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
918 | if (ret != 0) | |
919 | goto cleanup; | |
920 | ||
921 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
922 | if (t == 0) { | |
923 | ret = -ETIMEDOUT; | |
924 | goto cleanup; | |
925 | } | |
926 | ||
927 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
928 | vstor_packet->status != 0) | |
929 | goto cleanup; | |
930 | ||
931 | ||
932 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
933 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
934 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
8dcf37d4 S |
935 | |
936 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
937 | (sizeof(struct vstor_packet) - |
938 | vmscsi_size_delta), | |
8dcf37d4 S |
939 | (unsigned long)request, |
940 | VM_PKT_DATA_INBAND, | |
941 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
942 | ||
943 | if (ret != 0) | |
944 | goto cleanup; | |
945 | ||
946 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
947 | if (t == 0) { | |
948 | ret = -ETIMEDOUT; | |
949 | goto cleanup; | |
950 | } | |
951 | ||
952 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
953 | vstor_packet->status != 0) | |
954 | goto cleanup; | |
955 | ||
6f94d5de S |
956 | /* |
957 | * Check to see if multi-channel support is there. | |
958 | * Hosts that implement protocol version of 5.1 and above | |
959 | * support multi-channel. | |
960 | */ | |
961 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
962 | if ((vmbus_proto_version != VERSION_WIN7) && | |
963 | (vmbus_proto_version != VERSION_WS2008)) { | |
964 | if (vstor_packet->storage_channel_properties.flags & | |
965 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
966 | process_sub_channels = true; | |
967 | } | |
968 | ||
8dcf37d4 S |
969 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
970 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
971 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
972 | ||
973 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
974 | (sizeof(struct vstor_packet) - |
975 | vmscsi_size_delta), | |
8dcf37d4 S |
976 | (unsigned long)request, |
977 | VM_PKT_DATA_INBAND, | |
978 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
979 | ||
980 | if (ret != 0) | |
981 | goto cleanup; | |
982 | ||
983 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
984 | if (t == 0) { | |
985 | ret = -ETIMEDOUT; | |
986 | goto cleanup; | |
987 | } | |
988 | ||
989 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
990 | vstor_packet->status != 0) | |
991 | goto cleanup; | |
992 | ||
6f94d5de S |
993 | if (process_sub_channels) |
994 | handle_multichannel_storage(device, max_chns); | |
995 | ||
8dcf37d4 S |
996 | |
997 | cleanup: | |
998 | return ret; | |
999 | } | |
1000 | ||
c50bd448 S |
1001 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1002 | struct scsi_cmnd *scmnd, | |
1003 | struct Scsi_Host *host, | |
1004 | u8 asc, u8 ascq) | |
1005 | { | |
1006 | struct storvsc_scan_work *wrk; | |
1007 | void (*process_err_fn)(struct work_struct *work); | |
1008 | bool do_work = false; | |
1009 | ||
1010 | switch (vm_srb->srb_status) { | |
1011 | case SRB_STATUS_ERROR: | |
1012 | /* | |
1013 | * If there is an error; offline the device since all | |
1014 | * error recovery strategies would have already been | |
1015 | * deployed on the host side. However, if the command | |
1016 | * were a pass-through command deal with it appropriately. | |
1017 | */ | |
1018 | switch (scmnd->cmnd[0]) { | |
1019 | case ATA_16: | |
1020 | case ATA_12: | |
1021 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1022 | break; | |
3533f860 S |
1023 | /* |
1024 | * On Some Windows hosts TEST_UNIT_READY command can return | |
1025 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
1026 | * based on the sense information. | |
1027 | */ | |
1028 | case TEST_UNIT_READY: | |
1029 | break; | |
c50bd448 S |
1030 | default: |
1031 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1032 | } | |
1033 | break; | |
1034 | case SRB_STATUS_INVALID_LUN: | |
1035 | do_work = true; | |
1036 | process_err_fn = storvsc_remove_lun; | |
1037 | break; | |
6781209e S |
1038 | case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): |
1039 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
1040 | do_work = true; | |
1041 | process_err_fn = storvsc_device_scan; | |
1042 | /* | |
1043 | * Retry the I/O that trigerred this. | |
1044 | */ | |
1045 | set_host_byte(scmnd, DID_REQUEUE); | |
1046 | } | |
1047 | break; | |
c50bd448 | 1048 | } |
6781209e | 1049 | |
c50bd448 S |
1050 | if (!do_work) |
1051 | return; | |
1052 | ||
1053 | /* | |
1054 | * We need to schedule work to process this error; schedule it. | |
1055 | */ | |
1056 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1057 | if (!wrk) { | |
1058 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1059 | return; | |
1060 | } | |
1061 | ||
1062 | wrk->host = host; | |
1063 | wrk->lun = vm_srb->lun; | |
1064 | INIT_WORK(&wrk->work, process_err_fn); | |
1065 | schedule_work(&wrk->work); | |
1066 | } | |
1067 | ||
2707388c | 1068 | |
61eaffc9 | 1069 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) |
8dcf37d4 | 1070 | { |
2707388c S |
1071 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
1072 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
1073 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
1074 | struct scsi_sense_hdr sense_hdr; | |
1075 | struct vmscsi_request *vm_srb; | |
2707388c | 1076 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c50bd448 S |
1077 | struct Scsi_Host *host; |
1078 | struct storvsc_device *stor_dev; | |
1079 | struct hv_device *dev = host_dev->dev; | |
1080 | ||
1081 | stor_dev = get_in_stor_device(dev); | |
1082 | host = stor_dev->host; | |
8dcf37d4 | 1083 | |
61eaffc9 | 1084 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
2707388c S |
1085 | if (cmd_request->bounce_sgl_count) { |
1086 | if (vm_srb->data_in == READ_TYPE) | |
1087 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1088 | cmd_request->bounce_sgl, | |
1089 | scsi_sg_count(scmnd), | |
1090 | cmd_request->bounce_sgl_count); | |
1091 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1092 | cmd_request->bounce_sgl_count); | |
1093 | } | |
8dcf37d4 | 1094 | |
42e22cac S |
1095 | scmnd->result = vm_srb->scsi_status; |
1096 | ||
2707388c S |
1097 | if (scmnd->result) { |
1098 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
1099 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1100 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
1101 | } | |
1102 | ||
c50bd448 S |
1103 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
1104 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
1105 | sense_hdr.ascq); | |
1106 | ||
2707388c | 1107 | scsi_set_resid(scmnd, |
61eaffc9 | 1108 | cmd_request->data_buffer.len - |
2707388c S |
1109 | vm_srb->data_transfer_length); |
1110 | ||
1111 | scsi_done_fn = scmnd->scsi_done; | |
1112 | ||
1113 | scmnd->host_scribble = NULL; | |
1114 | scmnd->scsi_done = NULL; | |
1115 | ||
1116 | scsi_done_fn(scmnd); | |
1117 | ||
1118 | mempool_free(cmd_request, memp->request_mempool); | |
1119 | } | |
1120 | ||
1121 | static void storvsc_on_io_completion(struct hv_device *device, | |
1122 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1123 | struct storvsc_cmd_request *request) |
2707388c S |
1124 | { |
1125 | struct storvsc_device *stor_device; | |
1126 | struct vstor_packet *stor_pkt; | |
1127 | ||
1128 | stor_device = hv_get_drvdata(device); | |
1129 | stor_pkt = &request->vstor_packet; | |
1130 | ||
1131 | /* | |
1132 | * The current SCSI handling on the host side does | |
1133 | * not correctly handle: | |
1134 | * INQUIRY command with page code parameter set to 0x80 | |
1135 | * MODE_SENSE command with cmd[2] == 0x1c | |
1136 | * | |
1137 | * Setup srb and scsi status so this won't be fatal. | |
1138 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1139 | * (srb status == 0x4) and off-line the device in that case. |
1140 | */ | |
1141 | ||
1142 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1143 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1144 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1145 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1146 | } |
1147 | ||
8dcf37d4 S |
1148 | |
1149 | /* Copy over the status...etc */ | |
1150 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1151 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1152 | stor_pkt->vm_srb.sense_info_length = | |
1153 | vstor_packet->vm_srb.sense_info_length; | |
1154 | ||
8dcf37d4 S |
1155 | |
1156 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1157 | /* CHECK_CONDITION */ | |
16046320 S |
1158 | if (vstor_packet->vm_srb.srb_status & |
1159 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1160 | /* autosense data available */ |
8dcf37d4 S |
1161 | |
1162 | memcpy(request->sense_buffer, | |
1163 | vstor_packet->vm_srb.sense_data, | |
1164 | vstor_packet->vm_srb.sense_info_length); | |
1165 | ||
1166 | } | |
1167 | } | |
1168 | ||
1169 | stor_pkt->vm_srb.data_transfer_length = | |
1170 | vstor_packet->vm_srb.data_transfer_length; | |
1171 | ||
2707388c | 1172 | storvsc_command_completion(request); |
8dcf37d4 S |
1173 | |
1174 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1175 | stor_device->drain_notify) | |
1176 | wake_up(&stor_device->waiting_to_drain); | |
1177 | ||
1178 | ||
1179 | } | |
1180 | ||
1181 | static void storvsc_on_receive(struct hv_device *device, | |
1182 | struct vstor_packet *vstor_packet, | |
61eaffc9 | 1183 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1184 | { |
12675799 S |
1185 | struct storvsc_scan_work *work; |
1186 | struct storvsc_device *stor_device; | |
1187 | ||
8dcf37d4 S |
1188 | switch (vstor_packet->operation) { |
1189 | case VSTOR_OPERATION_COMPLETE_IO: | |
1190 | storvsc_on_io_completion(device, vstor_packet, request); | |
1191 | break; | |
12675799 | 1192 | |
8dcf37d4 | 1193 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
1194 | case VSTOR_OPERATION_ENUMERATE_BUS: |
1195 | stor_device = get_in_stor_device(device); | |
1196 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1197 | if (!work) | |
1198 | return; | |
1199 | ||
1200 | INIT_WORK(&work->work, storvsc_bus_scan); | |
1201 | work->host = stor_device->host; | |
1202 | schedule_work(&work->work); | |
1203 | break; | |
8dcf37d4 S |
1204 | |
1205 | default: | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | static void storvsc_on_channel_callback(void *context) | |
1211 | { | |
6f94d5de S |
1212 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1213 | struct hv_device *device; | |
8dcf37d4 S |
1214 | struct storvsc_device *stor_device; |
1215 | u32 bytes_recvd; | |
1216 | u64 request_id; | |
1217 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1218 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1219 | int ret; |
1220 | ||
6f94d5de S |
1221 | if (channel->primary_channel != NULL) |
1222 | device = channel->primary_channel->device_obj; | |
1223 | else | |
1224 | device = channel->device_obj; | |
8dcf37d4 S |
1225 | |
1226 | stor_device = get_in_stor_device(device); | |
1227 | if (!stor_device) | |
1228 | return; | |
1229 | ||
1230 | do { | |
6f94d5de | 1231 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1232 | ALIGN((sizeof(struct vstor_packet) - |
1233 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1234 | &bytes_recvd, &request_id); |
1235 | if (ret == 0 && bytes_recvd > 0) { | |
1236 | ||
61eaffc9 | 1237 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1238 | (unsigned long)request_id; |
1239 | ||
1240 | if ((request == &stor_device->init_request) || | |
1241 | (request == &stor_device->reset_request)) { | |
1242 | ||
1243 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1244 | (sizeof(struct vstor_packet) - |
1245 | vmscsi_size_delta)); | |
8dcf37d4 S |
1246 | complete(&request->wait_event); |
1247 | } else { | |
1248 | storvsc_on_receive(device, | |
1249 | (struct vstor_packet *)packet, | |
1250 | request); | |
1251 | } | |
1252 | } else { | |
1253 | break; | |
1254 | } | |
1255 | } while (1); | |
1256 | ||
1257 | return; | |
1258 | } | |
1259 | ||
1260 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
1261 | { | |
1262 | struct vmstorage_channel_properties props; | |
1263 | int ret; | |
1264 | ||
1265 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1266 | ||
8dcf37d4 S |
1267 | ret = vmbus_open(device->channel, |
1268 | ring_size, | |
1269 | ring_size, | |
1270 | (void *)&props, | |
1271 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1272 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1273 | |
1274 | if (ret != 0) | |
1275 | return ret; | |
1276 | ||
1277 | ret = storvsc_channel_init(device); | |
1278 | ||
1279 | return ret; | |
1280 | } | |
1281 | ||
c1b3d067 | 1282 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1283 | { |
1284 | struct storvsc_device *stor_device; | |
1285 | unsigned long flags; | |
1286 | ||
cd654ea1 | 1287 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1288 | |
1289 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1290 | stor_device->destroy = true; | |
1291 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1292 | ||
1293 | /* | |
1294 | * At this point, all outbound traffic should be disable. We | |
1295 | * only allow inbound traffic (responses) to proceed so that | |
1296 | * outstanding requests can be completed. | |
1297 | */ | |
1298 | ||
1299 | storvsc_wait_to_drain(stor_device); | |
1300 | ||
1301 | /* | |
1302 | * Since we have already drained, we don't need to busy wait | |
1303 | * as was done in final_release_stor_device() | |
1304 | * Note that we cannot set the ext pointer to NULL until | |
1305 | * we have drained - to drain the outgoing packets, we need to | |
1306 | * allow incoming packets. | |
1307 | */ | |
1308 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1309 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1310 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1311 | ||
1312 | /* Close the channel */ | |
1313 | vmbus_close(device->channel); | |
1314 | ||
1315 | kfree(stor_device); | |
1316 | return 0; | |
1317 | } | |
1318 | ||
c1b3d067 | 1319 | static int storvsc_do_io(struct hv_device *device, |
61eaffc9 | 1320 | struct storvsc_cmd_request *request) |
8dcf37d4 S |
1321 | { |
1322 | struct storvsc_device *stor_device; | |
1323 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1324 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 S |
1325 | int ret = 0; |
1326 | ||
1327 | vstor_packet = &request->vstor_packet; | |
1328 | stor_device = get_out_stor_device(device); | |
1329 | ||
1330 | if (!stor_device) | |
1331 | return -ENODEV; | |
1332 | ||
1333 | ||
1334 | request->device = device; | |
6f94d5de S |
1335 | /* |
1336 | * Select an an appropriate channel to send the request out. | |
1337 | */ | |
1338 | ||
1339 | outgoing_channel = vmbus_get_outgoing_channel(device->channel); | |
8dcf37d4 S |
1340 | |
1341 | ||
1342 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1343 | ||
8b612fa2 S |
1344 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1345 | vmscsi_size_delta); | |
8dcf37d4 S |
1346 | |
1347 | ||
8b612fa2 | 1348 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1349 | |
1350 | ||
1351 | vstor_packet->vm_srb.data_transfer_length = | |
1352 | request->data_buffer.len; | |
1353 | ||
1354 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1355 | ||
1356 | if (request->data_buffer.len) { | |
6f94d5de | 1357 | ret = vmbus_sendpacket_multipagebuffer(outgoing_channel, |
8dcf37d4 S |
1358 | &request->data_buffer, |
1359 | vstor_packet, | |
8b612fa2 S |
1360 | (sizeof(struct vstor_packet) - |
1361 | vmscsi_size_delta), | |
8dcf37d4 S |
1362 | (unsigned long)request); |
1363 | } else { | |
1364 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1365 | (sizeof(struct vstor_packet) - |
1366 | vmscsi_size_delta), | |
8dcf37d4 S |
1367 | (unsigned long)request, |
1368 | VM_PKT_DATA_INBAND, | |
1369 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1370 | } | |
1371 | ||
1372 | if (ret != 0) | |
1373 | return ret; | |
1374 | ||
1375 | atomic_inc(&stor_device->num_outstanding_req); | |
1376 | ||
1377 | return ret; | |
1378 | } | |
1379 | ||
5b60acee S |
1380 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1381 | { | |
ce3e301c S |
1382 | struct stor_mem_pools *memp; |
1383 | int number = STORVSC_MIN_BUF_NR; | |
1384 | ||
1385 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1386 | if (!memp) | |
1387 | return -ENOMEM; | |
1388 | ||
1389 | memp->request_pool = | |
1390 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1391 | sizeof(struct storvsc_cmd_request), 0, | |
1392 | SLAB_HWCACHE_ALIGN, NULL); | |
1393 | ||
1394 | if (!memp->request_pool) | |
1395 | goto err0; | |
1396 | ||
1397 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1398 | mempool_free_slab, | |
1399 | memp->request_pool); | |
1400 | ||
1401 | if (!memp->request_mempool) | |
1402 | goto err1; | |
1403 | ||
1404 | sdevice->hostdata = memp; | |
1405 | ||
5b60acee | 1406 | return 0; |
ce3e301c S |
1407 | |
1408 | err1: | |
1409 | kmem_cache_destroy(memp->request_pool); | |
1410 | ||
1411 | err0: | |
1412 | kfree(memp); | |
1413 | return -ENOMEM; | |
1414 | } | |
1415 | ||
1416 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1417 | { | |
1418 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1419 | ||
b12bb60d AN |
1420 | if (!memp) |
1421 | return; | |
1422 | ||
ce3e301c S |
1423 | mempool_destroy(memp->request_mempool); |
1424 | kmem_cache_destroy(memp->request_pool); | |
1425 | kfree(memp); | |
1426 | sdevice->hostdata = NULL; | |
5b60acee S |
1427 | } |
1428 | ||
419f2d03 S |
1429 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1430 | { | |
1431 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1432 | STORVSC_MAX_IO_REQUESTS); | |
1433 | ||
419f2d03 S |
1434 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1435 | ||
419f2d03 | 1436 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1437 | |
893def38 S |
1438 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1439 | ||
3e8f4f40 OH |
1440 | sdevice->no_write_same = 1; |
1441 | ||
f3cfabce S |
1442 | /* |
1443 | * Add blist flags to permit the reading of the VPD pages even when | |
1444 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1445 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1446 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1447 | */ | |
1448 | sdevice->sdev_bflags |= msft_blist_flags; | |
1449 | ||
419f2d03 S |
1450 | return 0; |
1451 | } | |
1452 | ||
62838ce2 S |
1453 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1454 | sector_t capacity, int *info) | |
1455 | { | |
5326fd5c S |
1456 | sector_t nsect = capacity; |
1457 | sector_t cylinders = nsect; | |
1458 | int heads, sectors_pt; | |
62838ce2 | 1459 | |
5326fd5c S |
1460 | /* |
1461 | * We are making up these values; let us keep it simple. | |
1462 | */ | |
1463 | heads = 0xff; | |
1464 | sectors_pt = 0x3f; /* Sectors per track */ | |
1465 | sector_div(cylinders, heads * sectors_pt); | |
1466 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1467 | cylinders = 0xffff; | |
62838ce2 S |
1468 | |
1469 | info[0] = heads; | |
5326fd5c S |
1470 | info[1] = sectors_pt; |
1471 | info[2] = (int)cylinders; | |
62838ce2 | 1472 | |
62838ce2 S |
1473 | return 0; |
1474 | } | |
aa3d789e | 1475 | |
4b270c8b | 1476 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1477 | { |
4b270c8b S |
1478 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1479 | struct hv_device *device = host_dev->dev; | |
1480 | ||
aa3d789e | 1481 | struct storvsc_device *stor_device; |
61eaffc9 | 1482 | struct storvsc_cmd_request *request; |
aa3d789e S |
1483 | struct vstor_packet *vstor_packet; |
1484 | int ret, t; | |
1485 | ||
aa3d789e | 1486 | |
1eaaddf9 | 1487 | stor_device = get_out_stor_device(device); |
aa3d789e | 1488 | if (!stor_device) |
a00e8224 | 1489 | return FAILED; |
aa3d789e S |
1490 | |
1491 | request = &stor_device->reset_request; | |
1492 | vstor_packet = &request->vstor_packet; | |
1493 | ||
1494 | init_completion(&request->wait_event); | |
1495 | ||
1496 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1497 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1498 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1499 | ||
1500 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1501 | (sizeof(struct vstor_packet) - |
1502 | vmscsi_size_delta), | |
aa3d789e S |
1503 | (unsigned long)&stor_device->reset_request, |
1504 | VM_PKT_DATA_INBAND, | |
1505 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1506 | if (ret != 0) | |
a00e8224 | 1507 | return FAILED; |
aa3d789e | 1508 | |
46d2eb6d | 1509 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1510 | if (t == 0) |
1511 | return TIMEOUT_ERROR; | |
aa3d789e | 1512 | |
aa3d789e S |
1513 | |
1514 | /* | |
1515 | * At this point, all outstanding requests in the adapter | |
1516 | * should have been flushed out and return to us | |
5c1b10ab S |
1517 | * There is a potential race here where the host may be in |
1518 | * the process of responding when we return from here. | |
1519 | * Just wait for all in-transit packets to be accounted for | |
1520 | * before we return from here. | |
aa3d789e | 1521 | */ |
5c1b10ab | 1522 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1523 | |
a00e8224 | 1524 | return SUCCESS; |
aa3d789e S |
1525 | } |
1526 | ||
56b26e69 S |
1527 | /* |
1528 | * The host guarantees to respond to each command, although I/O latencies might | |
1529 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1530 | * chance to perform EH. | |
1531 | */ | |
1532 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1533 | { | |
1534 | return BLK_EH_RESET_TIMER; | |
1535 | } | |
1536 | ||
c77b63b6 | 1537 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1538 | { |
1539 | bool allowed = true; | |
1540 | u8 scsi_op = scmnd->cmnd[0]; | |
1541 | ||
1542 | switch (scsi_op) { | |
3e8f4f40 OH |
1543 | /* the host does not handle WRITE_SAME, log accident usage */ |
1544 | case WRITE_SAME: | |
c77b63b6 S |
1545 | /* |
1546 | * smartd sends this command and the host does not handle | |
1547 | * this. So, don't send it. | |
1548 | */ | |
41098f8f | 1549 | case SET_WINDOW: |
59e00e74 | 1550 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1551 | allowed = false; |
1552 | break; | |
1553 | default: | |
1554 | break; | |
92ae4ebd OH |
1555 | } |
1556 | return allowed; | |
1557 | } | |
c5b463ae | 1558 | |
bab445e1 | 1559 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1560 | { |
1561 | int ret; | |
bab445e1 | 1562 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1563 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1564 | struct storvsc_cmd_request *cmd_request; |
1565 | unsigned int request_size = 0; | |
1566 | int i; | |
1567 | struct scatterlist *sgl; | |
1568 | unsigned int sg_count = 0; | |
1569 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1570 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1571 | |
8caf92d8 S |
1572 | if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) { |
1573 | /* | |
1574 | * On legacy hosts filter unimplemented commands. | |
1575 | * Future hosts are expected to correctly handle | |
1576 | * unsupported commands. Furthermore, it is | |
1577 | * possible that some of the currently | |
1578 | * unsupported commands maybe supported in | |
1579 | * future versions of the host. | |
1580 | */ | |
1581 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1582 | scmnd->scsi_done(scmnd); | |
1583 | return 0; | |
1584 | } | |
92ae4ebd | 1585 | } |
c5b463ae | 1586 | |
c5b463ae S |
1587 | request_size = sizeof(struct storvsc_cmd_request); |
1588 | ||
ce3e301c | 1589 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1590 | GFP_ATOMIC); |
c77b63b6 S |
1591 | |
1592 | /* | |
1593 | * We might be invoked in an interrupt context; hence | |
1594 | * mempool_alloc() can fail. | |
1595 | */ | |
bab445e1 | 1596 | if (!cmd_request) |
c5b463ae | 1597 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1598 | |
4e03e697 | 1599 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1600 | |
1601 | /* Setup the cmd request */ | |
c5b463ae S |
1602 | cmd_request->cmd = scmnd; |
1603 | ||
1604 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1605 | ||
61eaffc9 | 1606 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1607 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1608 | |
f885fb73 S |
1609 | vm_srb->win8_extension.srb_flags |= |
1610 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | | |
1611 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER); | |
c5b463ae S |
1612 | |
1613 | /* Build the SRB */ | |
1614 | switch (scmnd->sc_data_direction) { | |
1615 | case DMA_TO_DEVICE: | |
1616 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1617 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1618 | break; |
1619 | case DMA_FROM_DEVICE: | |
1620 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1621 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae S |
1622 | break; |
1623 | default: | |
1624 | vm_srb->data_in = UNKNOWN_TYPE; | |
f885fb73 S |
1625 | vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN | |
1626 | SRB_FLAGS_DATA_OUT); | |
c5b463ae S |
1627 | break; |
1628 | } | |
1629 | ||
c5b463ae | 1630 | |
c5b463ae S |
1631 | vm_srb->port_number = host_dev->port; |
1632 | vm_srb->path_id = scmnd->device->channel; | |
1633 | vm_srb->target_id = scmnd->device->id; | |
1634 | vm_srb->lun = scmnd->device->lun; | |
1635 | ||
c5b463ae S |
1636 | vm_srb->cdb_length = scmnd->cmd_len; |
1637 | ||
1638 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1639 | ||
61eaffc9 | 1640 | cmd_request->sense_buffer = scmnd->sense_buffer; |
c5b463ae S |
1641 | |
1642 | ||
61eaffc9 | 1643 | cmd_request->data_buffer.len = scsi_bufflen(scmnd); |
c5b463ae S |
1644 | if (scsi_sg_count(scmnd)) { |
1645 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1646 | sg_count = scsi_sg_count(scmnd); | |
1647 | ||
1648 | /* check if we need to bounce the sgl */ | |
1649 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1650 | cmd_request->bounce_sgl = | |
1651 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1652 | scsi_bufflen(scmnd), |
1653 | vm_srb->data_in); | |
c5b463ae | 1654 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1655 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1656 | goto queue_error; | |
c5b463ae S |
1657 | } |
1658 | ||
1659 | cmd_request->bounce_sgl_count = | |
1660 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1661 | PAGE_SHIFT; | |
1662 | ||
fa23b8c7 S |
1663 | if (vm_srb->data_in == WRITE_TYPE) |
1664 | copy_to_bounce_buffer(sgl, | |
1665 | cmd_request->bounce_sgl, | |
1666 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1667 | |
1668 | sgl = cmd_request->bounce_sgl; | |
1669 | sg_count = cmd_request->bounce_sgl_count; | |
1670 | } | |
1671 | ||
61eaffc9 | 1672 | cmd_request->data_buffer.offset = sgl[0].offset; |
c5b463ae S |
1673 | |
1674 | for (i = 0; i < sg_count; i++) | |
61eaffc9 | 1675 | cmd_request->data_buffer.pfn_array[i] = |
c5b463ae S |
1676 | page_to_pfn(sg_page((&sgl[i]))); |
1677 | ||
1678 | } else if (scsi_sglist(scmnd)) { | |
61eaffc9 | 1679 | cmd_request->data_buffer.offset = |
c5b463ae | 1680 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
61eaffc9 | 1681 | cmd_request->data_buffer.pfn_array[0] = |
c5b463ae S |
1682 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1683 | } | |
1684 | ||
c5b463ae | 1685 | /* Invokes the vsc to start an IO */ |
61eaffc9 | 1686 | ret = storvsc_do_io(dev, cmd_request); |
636f0fd1 | 1687 | |
d2598f01 | 1688 | if (ret == -EAGAIN) { |
c5b463ae S |
1689 | /* no more space */ |
1690 | ||
c77b63b6 | 1691 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1692 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1693 | cmd_request->bounce_sgl_count); |
c5b463ae | 1694 | |
c77b63b6 S |
1695 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1696 | goto queue_error; | |
1697 | } | |
c5b463ae S |
1698 | } |
1699 | ||
c77b63b6 S |
1700 | return 0; |
1701 | ||
1702 | queue_error: | |
1703 | mempool_free(cmd_request, memp->request_mempool); | |
1704 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1705 | return ret; |
1706 | } | |
1707 | ||
bef4a34a | 1708 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1709 | .module = THIS_MODULE, |
1710 | .name = "storvsc_host_t", | |
1711 | .bios_param = storvsc_get_chs, | |
1712 | .queuecommand = storvsc_queuecommand, | |
1713 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
56b26e69 | 1714 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1715 | .slave_alloc = storvsc_device_alloc, |
ce3e301c | 1716 | .slave_destroy = storvsc_device_destroy, |
ff568d3a | 1717 | .slave_configure = storvsc_device_configure, |
52f9614d | 1718 | .cmd_per_lun = 255, |
0686e4f4 | 1719 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1720 | .this_id = -1, |
454f18a9 | 1721 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1722 | /* currently 32 */ |
1723 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1724 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1725 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1726 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1727 | .no_write_same = 1, |
bef4a34a HJ |
1728 | }; |
1729 | ||
ef52a81b S |
1730 | enum { |
1731 | SCSI_GUID, | |
1732 | IDE_GUID, | |
bde6d0f9 | 1733 | SFC_GUID, |
ef52a81b S |
1734 | }; |
1735 | ||
d847b5fe | 1736 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1737 | /* SCSI guid */ |
35c3bc20 S |
1738 | { HV_SCSI_GUID, |
1739 | .driver_data = SCSI_GUID | |
1740 | }, | |
21e37742 | 1741 | /* IDE guid */ |
35c3bc20 S |
1742 | { HV_IDE_GUID, |
1743 | .driver_data = IDE_GUID | |
1744 | }, | |
bde6d0f9 S |
1745 | /* Fibre Channel GUID */ |
1746 | { | |
1747 | HV_SYNTHFC_GUID, | |
1748 | .driver_data = SFC_GUID | |
1749 | }, | |
c45cf2d4 | 1750 | { }, |
d847b5fe | 1751 | }; |
bef4a34a | 1752 | |
d847b5fe | 1753 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1754 | |
84946899 S |
1755 | static int storvsc_probe(struct hv_device *device, |
1756 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1757 | { |
ff568d3a | 1758 | int ret; |
bef4a34a | 1759 | struct Scsi_Host *host; |
795b613d | 1760 | struct hv_host_device *host_dev; |
ef52a81b | 1761 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1762 | int target = 0; |
6e4198ce | 1763 | struct storvsc_device *stor_device; |
bd1f5d6a | 1764 | |
8b612fa2 S |
1765 | /* |
1766 | * Based on the windows host we are running on, | |
1767 | * set state to properly communicate with the host. | |
1768 | */ | |
1769 | ||
adb6f9e1 S |
1770 | switch (vmbus_proto_version) { |
1771 | case VERSION_WS2008: | |
1772 | case VERSION_WIN7: | |
8b612fa2 S |
1773 | sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
1774 | vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
1775 | vmstor_current_major = VMSTOR_WIN7_MAJOR; | |
1776 | vmstor_current_minor = VMSTOR_WIN7_MINOR; | |
adb6f9e1 S |
1777 | break; |
1778 | default: | |
1779 | sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE; | |
1780 | vmscsi_size_delta = 0; | |
1781 | vmstor_current_major = VMSTOR_WIN8_MAJOR; | |
1782 | vmstor_current_minor = VMSTOR_WIN8_MINOR; | |
1783 | break; | |
8b612fa2 S |
1784 | } |
1785 | ||
4cd83ecd S |
1786 | if (dev_id->driver_data == SFC_GUID) |
1787 | scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS * | |
1788 | STORVSC_FC_MAX_TARGETS); | |
ff568d3a | 1789 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1790 | sizeof(struct hv_host_device)); |
f8feed06 | 1791 | if (!host) |
bef4a34a | 1792 | return -ENOMEM; |
bef4a34a | 1793 | |
7f33f30a | 1794 | host_dev = shost_priv(host); |
795b613d | 1795 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1796 | |
795b613d | 1797 | host_dev->port = host->host_no; |
97c15296 | 1798 | host_dev->dev = device; |
bef4a34a | 1799 | |
4e03e697 | 1800 | |
a13d35ab | 1801 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1802 | if (!stor_device) { |
225ce6ea | 1803 | ret = -ENOMEM; |
ce3e301c | 1804 | goto err_out0; |
6e4198ce | 1805 | } |
9efd21e1 | 1806 | |
a13d35ab | 1807 | stor_device->destroy = false; |
6f94d5de | 1808 | stor_device->open_sub_channel = false; |
a13d35ab S |
1809 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1810 | stor_device->device = device; | |
cd654ea1 S |
1811 | stor_device->host = host; |
1812 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1813 | |
6e4198ce S |
1814 | stor_device->port_number = host->host_no; |
1815 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1816 | if (ret) |
ce3e301c | 1817 | goto err_out1; |
bef4a34a | 1818 | |
6e4198ce S |
1819 | host_dev->path = stor_device->path_id; |
1820 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1821 | |
4cd83ecd S |
1822 | switch (dev_id->driver_data) { |
1823 | case SFC_GUID: | |
1824 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1825 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1826 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
1827 | break; | |
1828 | ||
1829 | case SCSI_GUID: | |
1830 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1831 | host->max_id = STORVSC_MAX_TARGETS; | |
1832 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
1833 | break; | |
1834 | ||
1835 | default: | |
1836 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1837 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1838 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1839 | break; | |
1840 | } | |
cf55f4a8 MS |
1841 | /* max cmd length */ |
1842 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1843 | |
454f18a9 | 1844 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1845 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1846 | if (ret != 0) |
ce3e301c | 1847 | goto err_out2; |
bef4a34a | 1848 | |
bd1f5d6a S |
1849 | if (!dev_is_ide) { |
1850 | scsi_scan_host(host); | |
59d22950 S |
1851 | } else { |
1852 | target = (device->dev_instance.b[5] << 8 | | |
1853 | device->dev_instance.b[4]); | |
1854 | ret = scsi_add_device(host, 0, target, 0); | |
1855 | if (ret) { | |
1856 | scsi_remove_host(host); | |
1857 | goto err_out2; | |
1858 | } | |
bef4a34a | 1859 | } |
bd1f5d6a | 1860 | return 0; |
bef4a34a | 1861 | |
ce3e301c | 1862 | err_out2: |
225ce6ea S |
1863 | /* |
1864 | * Once we have connected with the host, we would need to | |
1865 | * to invoke storvsc_dev_remove() to rollback this state and | |
1866 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1867 | * err_out1 label. |
225ce6ea | 1868 | */ |
bd1f5d6a | 1869 | storvsc_dev_remove(device); |
ce3e301c | 1870 | goto err_out0; |
225ce6ea S |
1871 | |
1872 | err_out1: | |
ce3e301c | 1873 | kfree(stor_device); |
225ce6ea S |
1874 | |
1875 | err_out0: | |
bd1f5d6a | 1876 | scsi_host_put(host); |
225ce6ea | 1877 | return ret; |
bef4a34a HJ |
1878 | } |
1879 | ||
ddcbf65e S |
1880 | static int storvsc_remove(struct hv_device *dev) |
1881 | { | |
1882 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1883 | struct Scsi_Host *host = stor_device->host; | |
1884 | ||
1885 | scsi_remove_host(host); | |
1886 | storvsc_dev_remove(dev); | |
1887 | scsi_host_put(host); | |
1888 | ||
1889 | return 0; | |
1890 | } | |
1891 | ||
40bf63ed | 1892 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1893 | .name = KBUILD_MODNAME, |
d847b5fe | 1894 | .id_table = id_table, |
40bf63ed S |
1895 | .probe = storvsc_probe, |
1896 | .remove = storvsc_remove, | |
39ae6fae | 1897 | }; |
7bd05b91 | 1898 | |
d9bbae83 | 1899 | static int __init storvsc_drv_init(void) |
f5c78872 | 1900 | { |
01415ab3 S |
1901 | u32 max_outstanding_req_per_channel; |
1902 | ||
1903 | /* | |
1904 | * Divide the ring buffer data size (which is 1 page less | |
1905 | * than the ring buffer size since that page is reserved for | |
1906 | * the ring buffer indices) by the max request size (which is | |
1907 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1908 | */ | |
01415ab3 | 1909 | max_outstanding_req_per_channel = |
768fa219 GKH |
1910 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1911 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1912 | sizeof(struct vstor_packet) + sizeof(u64) - |
1913 | vmscsi_size_delta, | |
768fa219 | 1914 | sizeof(u64))); |
f5c78872 | 1915 | |
01415ab3 | 1916 | if (max_outstanding_req_per_channel < |
f5c78872 | 1917 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1918 | return -EINVAL; |
f5c78872 | 1919 | |
768fa219 | 1920 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1921 | } |
1922 | ||
c63ba9e1 | 1923 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1924 | { |
768fa219 | 1925 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1926 | } |
1927 | ||
ff568d3a | 1928 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1929 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1930 | module_init(storvsc_drv_init); |
c63ba9e1 | 1931 | module_exit(storvsc_drv_exit); |