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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
a1be1706 S |
22 | |
23 | #include <linux/kernel.h> | |
f0d79fe9 | 24 | #include <linux/wait.h> |
a1be1706 S |
25 | #include <linux/sched.h> |
26 | #include <linux/completion.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/delay.h> | |
bef4a34a | 30 | #include <linux/init.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
bef4a34a HJ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> | |
46a97191 | 34 | #include <linux/hyperv.h> |
56b26e69 | 35 | #include <linux/blkdev.h> |
bef4a34a HJ |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_tcq.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 43 | #include <scsi/scsi_dbg.h> |
dac58241 | 44 | #include <scsi/scsi_transport_fc.h> |
d791a8c6 | 45 | #include <scsi/scsi_transport.h> |
3f335ea2 | 46 | |
09f0355f | 47 | /* |
af9584b8 S |
48 | * All wire protocol details (storage protocol between the guest and the host) |
49 | * are consolidated here. | |
50 | * | |
51 | * Begin protocol definitions. | |
09f0355f S |
52 | */ |
53 | ||
09f0355f S |
54 | /* |
55 | * Version history: | |
56 | * V1 Beta: 0.1 | |
57 | * V1 RC < 2008/1/31: 1.0 | |
58 | * V1 RC > 2008/1/31: 2.0 | |
59 | * Win7: 4.2 | |
8b612fa2 | 60 | * Win8: 5.1 |
1a363108 KM |
61 | * Win8.1: 6.0 |
62 | * Win10: 6.2 | |
09f0355f S |
63 | */ |
64 | ||
2492fd7a KM |
65 | #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
66 | (((MINOR_) & 0xff))) | |
8b612fa2 | 67 | |
1a363108 | 68 | #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
2492fd7a KM |
69 | #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
70 | #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) | |
1a363108 KM |
71 | #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
72 | #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) | |
f0d79fe9 | 73 | |
f0d79fe9 S |
74 | /* Packet structure describing virtual storage requests. */ |
75 | enum vstor_packet_operation { | |
76 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
77 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
78 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
79 | VSTOR_OPERATION_RESET_LUN = 4, | |
80 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
81 | VSTOR_OPERATION_RESET_BUS = 6, | |
82 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
83 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
84 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
85 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 86 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
87 | VSTOR_OPERATION_FCHBA_DATA = 12, |
88 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
89 | VSTOR_OPERATION_MAXIMUM = 13 | |
90 | }; | |
91 | ||
92 | /* | |
93 | * WWN packet for Fibre Channel HBA | |
94 | */ | |
95 | ||
96 | struct hv_fc_wwn_packet { | |
83d1e8b9 S |
97 | u8 primary_active; |
98 | u8 reserved1[3]; | |
8b612fa2 S |
99 | u8 primary_port_wwn[8]; |
100 | u8 primary_node_wwn[8]; | |
101 | u8 secondary_port_wwn[8]; | |
102 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
103 | }; |
104 | ||
8b612fa2 S |
105 | |
106 | ||
107 | /* | |
108 | * SRB Flag Bits | |
109 | */ | |
110 | ||
111 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
112 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
113 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
114 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
115 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
116 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
117 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
118 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
119 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
120 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
121 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
122 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
123 | ||
124 | /* | |
125 | * This flag indicates the request is part of the workflow for processing a D3. | |
126 | */ | |
127 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
128 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
129 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
130 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
131 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
132 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
133 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
134 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
135 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
136 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
137 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
138 | ||
139 | ||
f0d79fe9 S |
140 | /* |
141 | * Platform neutral description of a scsi request - | |
142 | * this remains the same across the write regardless of 32/64 bit | |
143 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
144 | */ | |
6b2f9495 | 145 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
146 | |
147 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
148 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
149 | ||
150 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 151 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 152 | |
8b612fa2 S |
153 | /* |
154 | * Sense buffer size changed in win8; have a run-time | |
cb11fead KM |
155 | * variable to track the size we should use. This value will |
156 | * likely change during protocol negotiation but it is valid | |
157 | * to start by assuming pre-Win8. | |
8b612fa2 | 158 | */ |
cb11fead | 159 | static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
8b612fa2 S |
160 | |
161 | /* | |
cb11fead KM |
162 | * The storage protocol version is determined during the |
163 | * initial exchange with the host. It will indicate which | |
164 | * storage functionality is available in the host. | |
165 | */ | |
2492fd7a | 166 | static int vmstor_proto_version; |
8b612fa2 | 167 | |
f8aea701 LL |
168 | #define STORVSC_LOGGING_NONE 0 |
169 | #define STORVSC_LOGGING_ERROR 1 | |
170 | #define STORVSC_LOGGING_WARN 2 | |
171 | ||
172 | static int logging_level = STORVSC_LOGGING_ERROR; | |
173 | module_param(logging_level, int, S_IRUGO|S_IWUSR); | |
174 | MODULE_PARM_DESC(logging_level, | |
175 | "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); | |
176 | ||
177 | static inline bool do_logging(int level) | |
178 | { | |
179 | return logging_level >= level; | |
180 | } | |
181 | ||
182 | #define storvsc_log(dev, level, fmt, ...) \ | |
183 | do { \ | |
184 | if (do_logging(level)) \ | |
185 | dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ | |
186 | } while (0) | |
187 | ||
8b612fa2 S |
188 | struct vmscsi_win8_extension { |
189 | /* | |
190 | * The following were added in Windows 8 | |
191 | */ | |
192 | u16 reserve; | |
193 | u8 queue_tag; | |
194 | u8 queue_action; | |
195 | u32 srb_flags; | |
196 | u32 time_out_value; | |
197 | u32 queue_sort_ey; | |
198 | } __packed; | |
199 | ||
f0d79fe9 | 200 | struct vmscsi_request { |
c649114a S |
201 | u16 length; |
202 | u8 srb_status; | |
203 | u8 scsi_status; | |
f0d79fe9 | 204 | |
c649114a S |
205 | u8 port_number; |
206 | u8 path_id; | |
207 | u8 target_id; | |
208 | u8 lun; | |
f0d79fe9 | 209 | |
c649114a S |
210 | u8 cdb_length; |
211 | u8 sense_info_length; | |
212 | u8 data_in; | |
213 | u8 reserved; | |
f0d79fe9 | 214 | |
c649114a | 215 | u32 data_transfer_length; |
f0d79fe9 S |
216 | |
217 | union { | |
6b2f9495 S |
218 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
219 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
220 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 221 | }; |
8b612fa2 S |
222 | /* |
223 | * The following was added in win8. | |
224 | */ | |
225 | struct vmscsi_win8_extension win8_extension; | |
226 | ||
f0d79fe9 S |
227 | } __attribute((packed)); |
228 | ||
229 | ||
cb11fead KM |
230 | /* |
231 | * The size of the vmscsi_request has changed in win8. The | |
232 | * additional size is because of new elements added to the | |
233 | * structure. These elements are valid only when we are talking | |
234 | * to a win8 host. | |
235 | * Track the correction to size we need to apply. This value | |
236 | * will likely change during protocol negotiation but it is | |
237 | * valid to start by assuming pre-Win8. | |
238 | */ | |
239 | static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); | |
240 | ||
1a363108 KM |
241 | /* |
242 | * The list of storage protocols in order of preference. | |
243 | */ | |
244 | struct vmstor_protocol { | |
245 | int protocol_version; | |
246 | int sense_buffer_size; | |
247 | int vmscsi_size_delta; | |
248 | }; | |
249 | ||
250 | ||
251 | static const struct vmstor_protocol vmstor_protocols[] = { | |
252 | { | |
253 | VMSTOR_PROTO_VERSION_WIN10, | |
254 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
255 | 0 | |
256 | }, | |
257 | { | |
258 | VMSTOR_PROTO_VERSION_WIN8_1, | |
259 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
260 | 0 | |
261 | }, | |
262 | { | |
263 | VMSTOR_PROTO_VERSION_WIN8, | |
264 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
265 | 0 | |
266 | }, | |
267 | { | |
268 | VMSTOR_PROTO_VERSION_WIN7, | |
269 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
270 | sizeof(struct vmscsi_win8_extension), | |
271 | }, | |
272 | { | |
273 | VMSTOR_PROTO_VERSION_WIN6, | |
274 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
275 | sizeof(struct vmscsi_win8_extension), | |
276 | } | |
277 | }; | |
278 | ||
279 | ||
f0d79fe9 S |
280 | /* |
281 | * This structure is sent during the intialization phase to get the different | |
282 | * properties of the channel. | |
283 | */ | |
8b612fa2 S |
284 | |
285 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
286 | ||
f0d79fe9 | 287 | struct vmstorage_channel_properties { |
8b612fa2 S |
288 | u32 reserved; |
289 | u16 max_channel_cnt; | |
290 | u16 reserved1; | |
f0d79fe9 | 291 | |
8b612fa2 | 292 | u32 flags; |
c649114a | 293 | u32 max_transfer_bytes; |
f0d79fe9 | 294 | |
8b612fa2 | 295 | u64 reserved2; |
f0d79fe9 S |
296 | } __packed; |
297 | ||
298 | /* This structure is sent during the storage protocol negotiations. */ | |
299 | struct vmstorage_protocol_version { | |
300 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 301 | u16 major_minor; |
f0d79fe9 S |
302 | |
303 | /* | |
304 | * Revision number is auto-incremented whenever this file is changed | |
305 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
306 | * definitely indicate incompatibility--but it does indicate mismatched | |
307 | * builds. | |
c649114a | 308 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 309 | */ |
85904a5e | 310 | u16 revision; |
f0d79fe9 S |
311 | } __packed; |
312 | ||
313 | /* Channel Property Flags */ | |
314 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
315 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
316 | ||
317 | struct vstor_packet { | |
318 | /* Requested operation type */ | |
319 | enum vstor_packet_operation operation; | |
320 | ||
321 | /* Flags - see below for values */ | |
c649114a | 322 | u32 flags; |
f0d79fe9 S |
323 | |
324 | /* Status of the request returned from the server side. */ | |
c649114a | 325 | u32 status; |
f0d79fe9 S |
326 | |
327 | /* Data payload area */ | |
328 | union { | |
329 | /* | |
330 | * Structure used to forward SCSI commands from the | |
331 | * client to the server. | |
332 | */ | |
333 | struct vmscsi_request vm_srb; | |
334 | ||
335 | /* Structure used to query channel properties. */ | |
336 | struct vmstorage_channel_properties storage_channel_properties; | |
337 | ||
338 | /* Used during version negotiations. */ | |
339 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
340 | |
341 | /* Fibre channel address packet */ | |
342 | struct hv_fc_wwn_packet wwn_packet; | |
343 | ||
344 | /* Number of sub-channels to create */ | |
345 | u16 sub_channel_count; | |
346 | ||
347 | /* This will be the maximum of the union members */ | |
348 | u8 buffer[0x34]; | |
f0d79fe9 S |
349 | }; |
350 | } __packed; | |
351 | ||
f0d79fe9 | 352 | /* |
09f0355f S |
353 | * Packet Flags: |
354 | * | |
f0d79fe9 S |
355 | * This flag indicates that the server should send back a completion for this |
356 | * packet. | |
357 | */ | |
09f0355f | 358 | |
f0d79fe9 S |
359 | #define REQUEST_COMPLETION_FLAG 0x1 |
360 | ||
f0d79fe9 S |
361 | /* Matches Windows-end */ |
362 | enum storvsc_request_type { | |
c649114a | 363 | WRITE_TYPE = 0, |
f0d79fe9 S |
364 | READ_TYPE, |
365 | UNKNOWN_TYPE, | |
366 | }; | |
367 | ||
16046320 S |
368 | /* |
369 | * SRB status codes and masks; a subset of the codes used here. | |
370 | */ | |
371 | ||
372 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
3209f9d7 | 373 | #define SRB_STATUS_QUEUE_FROZEN 0x40 |
16046320 S |
374 | #define SRB_STATUS_INVALID_LUN 0x20 |
375 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 376 | #define SRB_STATUS_ABORTED 0x02 |
16046320 S |
377 | #define SRB_STATUS_ERROR 0x04 |
378 | ||
3209f9d7 S |
379 | #define SRB_STATUS(status) \ |
380 | (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) | |
af9584b8 S |
381 | /* |
382 | * This is the end of Protocol specific defines. | |
383 | */ | |
384 | ||
b9ec3a55 | 385 | static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); |
f458aada S |
386 | static u32 max_outstanding_req_per_channel; |
387 | ||
388 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
389 | |
390 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
391 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
392 | ||
f458aada | 393 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
74e26784 | 394 | MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
893def38 S |
395 | /* |
396 | * Timeout in seconds for all devices managed by this driver. | |
397 | */ | |
398 | static int storvsc_timeout = 180; | |
399 | ||
f3cfabce S |
400 | static int msft_blist_flags = BLIST_TRY_VPD_PAGES; |
401 | ||
dac58241 S |
402 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
403 | static struct scsi_transport_template *fc_transport_template; | |
404 | #endif | |
af9584b8 | 405 | |
6f94d5de S |
406 | static void storvsc_on_channel_callback(void *context); |
407 | ||
4cd83ecd S |
408 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
409 | #define STORVSC_MAX_TARGETS 2 | |
410 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 411 | |
4cd83ecd S |
412 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
413 | #define STORVSC_FC_MAX_TARGETS 128 | |
414 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 415 | |
4cd83ecd S |
416 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
417 | #define STORVSC_IDE_MAX_TARGETS 1 | |
418 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 419 | |
61eaffc9 | 420 | struct storvsc_cmd_request { |
61eaffc9 S |
421 | struct scsi_cmnd *cmd; |
422 | ||
f0d79fe9 S |
423 | struct hv_device *device; |
424 | ||
425 | /* Synchronize the request/response if needed */ | |
426 | struct completion wait_event; | |
427 | ||
be0cf6ca S |
428 | struct vmbus_channel_packet_multipage_buffer mpb; |
429 | struct vmbus_packet_mpb_array *payload; | |
430 | u32 payload_sz; | |
431 | ||
f0d79fe9 S |
432 | struct vstor_packet vstor_packet; |
433 | }; | |
434 | ||
435 | ||
f0d79fe9 S |
436 | /* A storvsc device is a device object that contains a vmbus channel */ |
437 | struct storvsc_device { | |
438 | struct hv_device *device; | |
439 | ||
440 | bool destroy; | |
441 | bool drain_notify; | |
6f94d5de | 442 | bool open_sub_channel; |
f0d79fe9 | 443 | atomic_t num_outstanding_req; |
cd654ea1 | 444 | struct Scsi_Host *host; |
f0d79fe9 S |
445 | |
446 | wait_queue_head_t waiting_to_drain; | |
447 | ||
448 | /* | |
449 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
450 | * controller. In reality, the pathid, targetid is always 0 | |
451 | * and the port is set by us | |
452 | */ | |
453 | unsigned int port_number; | |
454 | unsigned char path_id; | |
455 | unsigned char target_id; | |
456 | ||
5117b936 S |
457 | /* |
458 | * Max I/O, the device can support. | |
459 | */ | |
460 | u32 max_transfer_bytes; | |
e8e0332e S |
461 | /* |
462 | * Number of sub-channels we will open. | |
463 | */ | |
464 | u16 num_sc; | |
465 | struct vmbus_channel **stor_chns; | |
466 | /* | |
467 | * Mask of CPUs bound to subchannels. | |
468 | */ | |
469 | struct cpumask alloced_cpus; | |
f0d79fe9 | 470 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
471 | struct storvsc_cmd_request init_request; |
472 | struct storvsc_cmd_request reset_request; | |
dac58241 S |
473 | /* |
474 | * Currently active port and node names for FC devices. | |
475 | */ | |
476 | u64 node_name; | |
477 | u64 port_name; | |
f0d79fe9 S |
478 | }; |
479 | ||
ce3e301c S |
480 | struct hv_host_device { |
481 | struct hv_device *dev; | |
c1b3d067 S |
482 | unsigned int port; |
483 | unsigned char path; | |
484 | unsigned char target; | |
485 | }; | |
486 | ||
12675799 S |
487 | struct storvsc_scan_work { |
488 | struct work_struct work; | |
489 | struct Scsi_Host *host; | |
98441221 S |
490 | u8 lun; |
491 | u8 tgt_id; | |
12675799 S |
492 | }; |
493 | ||
6781209e S |
494 | static void storvsc_device_scan(struct work_struct *work) |
495 | { | |
496 | struct storvsc_scan_work *wrk; | |
6781209e S |
497 | struct scsi_device *sdev; |
498 | ||
499 | wrk = container_of(work, struct storvsc_scan_work, work); | |
6781209e | 500 | |
98441221 | 501 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
6781209e S |
502 | if (!sdev) |
503 | goto done; | |
504 | scsi_rescan_device(&sdev->sdev_gendev); | |
505 | scsi_device_put(sdev); | |
506 | ||
507 | done: | |
508 | kfree(wrk); | |
509 | } | |
510 | ||
2a09ed3d | 511 | static void storvsc_host_scan(struct work_struct *work) |
12675799 S |
512 | { |
513 | struct storvsc_scan_work *wrk; | |
2a09ed3d | 514 | struct Scsi_Host *host; |
34a716bc | 515 | struct scsi_device *sdev; |
12675799 S |
516 | |
517 | wrk = container_of(work, struct storvsc_scan_work, work); | |
2a09ed3d S |
518 | host = wrk->host; |
519 | ||
34a716bc S |
520 | /* |
521 | * Before scanning the host, first check to see if any of the | |
522 | * currrently known devices have been hot removed. We issue a | |
523 | * "unit ready" command against all currently known devices. | |
524 | * This I/O will result in an error for devices that have been | |
525 | * removed. As part of handling the I/O error, we remove the device. | |
526 | * | |
527 | * When a LUN is added or removed, the host sends us a signal to | |
528 | * scan the host. Thus we are forced to discover the LUNs that | |
529 | * may have been removed this way. | |
530 | */ | |
531 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 532 | shost_for_each_device(sdev, host) |
34a716bc | 533 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
534 | mutex_unlock(&host->scan_mutex); |
535 | /* | |
536 | * Now scan the host to discover LUNs that may have been added. | |
537 | */ | |
2a09ed3d S |
538 | scsi_scan_host(host); |
539 | ||
12675799 S |
540 | kfree(wrk); |
541 | } | |
542 | ||
b4017319 S |
543 | static void storvsc_remove_lun(struct work_struct *work) |
544 | { | |
545 | struct storvsc_scan_work *wrk; | |
546 | struct scsi_device *sdev; | |
547 | ||
548 | wrk = container_of(work, struct storvsc_scan_work, work); | |
549 | if (!scsi_host_get(wrk->host)) | |
550 | goto done; | |
551 | ||
98441221 | 552 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
b4017319 S |
553 | |
554 | if (sdev) { | |
555 | scsi_remove_device(sdev); | |
556 | scsi_device_put(sdev); | |
557 | } | |
558 | scsi_host_put(wrk->host); | |
559 | ||
560 | done: | |
561 | kfree(wrk); | |
562 | } | |
563 | ||
af9584b8 | 564 | |
a8c18c57 S |
565 | /* |
566 | * We can get incoming messages from the host that are not in response to | |
567 | * messages that we have sent out. An example of this would be messages | |
568 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
569 | * deal with potential race conditions where the driver may be in the | |
570 | * midst of being unloaded when we might receive an unsolicited message | |
571 | * from the host, we have implemented a mechanism to gurantee sequential | |
572 | * consistency: | |
573 | * | |
574 | * 1) Once the device is marked as being destroyed, we will fail all | |
575 | * outgoing messages. | |
576 | * 2) We permit incoming messages when the device is being destroyed, | |
577 | * only to properly account for messages already sent out. | |
578 | */ | |
579 | ||
f0d79fe9 S |
580 | static inline struct storvsc_device *get_out_stor_device( |
581 | struct hv_device *device) | |
582 | { | |
583 | struct storvsc_device *stor_device; | |
584 | ||
cd654ea1 | 585 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
586 | |
587 | if (stor_device && stor_device->destroy) | |
588 | stor_device = NULL; | |
589 | ||
590 | return stor_device; | |
591 | } | |
592 | ||
593 | ||
594 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
595 | { | |
596 | dev->drain_notify = true; | |
597 | wait_event(dev->waiting_to_drain, | |
598 | atomic_read(&dev->num_outstanding_req) == 0); | |
599 | dev->drain_notify = false; | |
600 | } | |
bef4a34a | 601 | |
8dcf37d4 S |
602 | static inline struct storvsc_device *get_in_stor_device( |
603 | struct hv_device *device) | |
604 | { | |
605 | struct storvsc_device *stor_device; | |
8dcf37d4 | 606 | |
cd654ea1 | 607 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
608 | |
609 | if (!stor_device) | |
610 | goto get_in_err; | |
611 | ||
612 | /* | |
613 | * If the device is being destroyed; allow incoming | |
614 | * traffic only to cleanup outstanding requests. | |
615 | */ | |
616 | ||
617 | if (stor_device->destroy && | |
618 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
619 | stor_device = NULL; | |
620 | ||
621 | get_in_err: | |
8dcf37d4 S |
622 | return stor_device; |
623 | ||
624 | } | |
625 | ||
6f94d5de S |
626 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
627 | { | |
628 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
629 | struct storvsc_device *stor_device; | |
630 | struct vmstorage_channel_properties props; | |
631 | ||
632 | stor_device = get_out_stor_device(device); | |
633 | if (!stor_device) | |
634 | return; | |
635 | ||
636 | if (stor_device->open_sub_channel == false) | |
637 | return; | |
638 | ||
639 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
640 | ||
641 | vmbus_open(new_sc, | |
642 | storvsc_ringbuffer_size, | |
643 | storvsc_ringbuffer_size, | |
644 | (void *)&props, | |
645 | sizeof(struct vmstorage_channel_properties), | |
646 | storvsc_on_channel_callback, new_sc); | |
e8e0332e S |
647 | |
648 | if (new_sc->state == CHANNEL_OPENED_STATE) { | |
649 | stor_device->stor_chns[new_sc->target_cpu] = new_sc; | |
650 | cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); | |
651 | } | |
6f94d5de S |
652 | } |
653 | ||
654 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
655 | { | |
656 | struct storvsc_device *stor_device; | |
657 | int num_cpus = num_online_cpus(); | |
658 | int num_sc; | |
659 | struct storvsc_cmd_request *request; | |
660 | struct vstor_packet *vstor_packet; | |
661 | int ret, t; | |
662 | ||
663 | num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); | |
664 | stor_device = get_out_stor_device(device); | |
665 | if (!stor_device) | |
666 | return; | |
667 | ||
e8e0332e | 668 | stor_device->num_sc = num_sc; |
6f94d5de S |
669 | request = &stor_device->init_request; |
670 | vstor_packet = &request->vstor_packet; | |
671 | ||
672 | stor_device->open_sub_channel = true; | |
673 | /* | |
674 | * Establish a handler for dealing with subchannels. | |
675 | */ | |
676 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
677 | ||
678 | /* | |
679 | * Check to see if sub-channels have already been created. This | |
680 | * can happen when this driver is re-loaded after unloading. | |
681 | */ | |
682 | ||
683 | if (vmbus_are_subchannels_present(device->channel)) | |
684 | return; | |
685 | ||
686 | stor_device->open_sub_channel = false; | |
687 | /* | |
688 | * Request the host to create sub-channels. | |
689 | */ | |
690 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
691 | init_completion(&request->wait_event); | |
692 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
693 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
694 | vstor_packet->sub_channel_count = num_sc; | |
695 | ||
696 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
697 | (sizeof(struct vstor_packet) - | |
698 | vmscsi_size_delta), | |
699 | (unsigned long)request, | |
700 | VM_PKT_DATA_INBAND, | |
701 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
702 | ||
703 | if (ret != 0) | |
704 | return; | |
705 | ||
706 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
707 | if (t == 0) | |
708 | return; | |
709 | ||
710 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
711 | vstor_packet->status != 0) | |
712 | return; | |
713 | ||
714 | /* | |
715 | * Now that we created the sub-channels, invoke the check; this | |
716 | * may trigger the callback. | |
717 | */ | |
718 | stor_device->open_sub_channel = true; | |
719 | vmbus_are_subchannels_present(device->channel); | |
720 | } | |
721 | ||
dac58241 S |
722 | static void cache_wwn(struct storvsc_device *stor_device, |
723 | struct vstor_packet *vstor_packet) | |
724 | { | |
725 | /* | |
726 | * Cache the currently active port and node ww names. | |
727 | */ | |
728 | if (vstor_packet->wwn_packet.primary_active) { | |
729 | stor_device->node_name = | |
730 | wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); | |
731 | stor_device->port_name = | |
732 | wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); | |
733 | } else { | |
734 | stor_device->node_name = | |
735 | wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); | |
736 | stor_device->port_name = | |
737 | wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); | |
738 | } | |
739 | } | |
740 | ||
59635018 S |
741 | |
742 | static int storvsc_execute_vstor_op(struct hv_device *device, | |
743 | struct storvsc_cmd_request *request, | |
744 | bool status_check) | |
8dcf37d4 | 745 | { |
8dcf37d4 | 746 | struct vstor_packet *vstor_packet; |
59635018 | 747 | int ret, t; |
8dcf37d4 | 748 | |
8dcf37d4 S |
749 | vstor_packet = &request->vstor_packet; |
750 | ||
8dcf37d4 | 751 | init_completion(&request->wait_event); |
8dcf37d4 S |
752 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
753 | ||
754 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
755 | (sizeof(struct vstor_packet) - |
756 | vmscsi_size_delta), | |
8dcf37d4 S |
757 | (unsigned long)request, |
758 | VM_PKT_DATA_INBAND, | |
759 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
760 | if (ret != 0) | |
dac58241 | 761 | return ret; |
8dcf37d4 S |
762 | |
763 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
dac58241 S |
764 | if (t == 0) |
765 | return -ETIMEDOUT; | |
8dcf37d4 | 766 | |
59635018 S |
767 | if (!status_check) |
768 | return ret; | |
769 | ||
8dcf37d4 | 770 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
dac58241 S |
771 | vstor_packet->status != 0) |
772 | return -EINVAL; | |
8dcf37d4 | 773 | |
59635018 S |
774 | return ret; |
775 | } | |
776 | ||
777 | static int storvsc_channel_init(struct hv_device *device, bool is_fc) | |
778 | { | |
779 | struct storvsc_device *stor_device; | |
780 | struct storvsc_cmd_request *request; | |
781 | struct vstor_packet *vstor_packet; | |
782 | int ret, i; | |
783 | int max_chns; | |
784 | bool process_sub_channels = false; | |
785 | ||
786 | stor_device = get_out_stor_device(device); | |
787 | if (!stor_device) | |
788 | return -ENODEV; | |
789 | ||
790 | request = &stor_device->init_request; | |
791 | vstor_packet = &request->vstor_packet; | |
792 | ||
793 | /* | |
794 | * Now, initiate the vsc/vsp initialization protocol on the open | |
795 | * channel | |
796 | */ | |
797 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
798 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
799 | ret = storvsc_execute_vstor_op(device, request, true); | |
800 | if (ret) | |
801 | return ret; | |
802 | /* | |
803 | * Query host supported protocol version. | |
804 | */ | |
8dcf37d4 | 805 | |
1a363108 KM |
806 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
807 | /* reuse the packet for version range supported */ | |
808 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
809 | vstor_packet->operation = | |
810 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
8dcf37d4 | 811 | |
1a363108 KM |
812 | vstor_packet->version.major_minor = |
813 | vmstor_protocols[i].protocol_version; | |
85904a5e | 814 | |
1a363108 KM |
815 | /* |
816 | * The revision number is only used in Windows; set it to 0. | |
817 | */ | |
818 | vstor_packet->version.revision = 0; | |
59635018 | 819 | ret = storvsc_execute_vstor_op(device, request, false); |
1a363108 | 820 | if (ret != 0) |
dac58241 | 821 | return ret; |
8dcf37d4 | 822 | |
dac58241 S |
823 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
824 | return -EINVAL; | |
1a363108 KM |
825 | |
826 | if (vstor_packet->status == 0) { | |
827 | vmstor_proto_version = | |
828 | vmstor_protocols[i].protocol_version; | |
829 | ||
830 | sense_buffer_size = | |
831 | vmstor_protocols[i].sense_buffer_size; | |
832 | ||
833 | vmscsi_size_delta = | |
834 | vmstor_protocols[i].vmscsi_size_delta; | |
835 | ||
836 | break; | |
837 | } | |
8dcf37d4 S |
838 | } |
839 | ||
dac58241 S |
840 | if (vstor_packet->status != 0) |
841 | return -EINVAL; | |
8dcf37d4 S |
842 | |
843 | ||
844 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
845 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
59635018 | 846 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 847 | if (ret != 0) |
dac58241 | 848 | return ret; |
8dcf37d4 | 849 | |
6f94d5de S |
850 | /* |
851 | * Check to see if multi-channel support is there. | |
852 | * Hosts that implement protocol version of 5.1 and above | |
853 | * support multi-channel. | |
854 | */ | |
855 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
e8e0332e S |
856 | |
857 | /* | |
858 | * Allocate state to manage the sub-channels. | |
859 | * We allocate an array based on the numbers of possible CPUs | |
860 | * (Hyper-V does not support cpu online/offline). | |
861 | * This Array will be sparseley populated with unique | |
862 | * channels - primary + sub-channels. | |
863 | * We will however populate all the slots to evenly distribute | |
864 | * the load. | |
865 | */ | |
866 | stor_device->stor_chns = kzalloc(sizeof(void *) * num_possible_cpus(), | |
867 | GFP_KERNEL); | |
868 | if (stor_device->stor_chns == NULL) | |
869 | return -ENOMEM; | |
870 | ||
871 | stor_device->stor_chns[device->channel->target_cpu] = device->channel; | |
872 | cpumask_set_cpu(device->channel->target_cpu, | |
873 | &stor_device->alloced_cpus); | |
874 | ||
e6c4bc66 | 875 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
6f94d5de S |
876 | if (vstor_packet->storage_channel_properties.flags & |
877 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
878 | process_sub_channels = true; | |
879 | } | |
5117b936 S |
880 | stor_device->max_transfer_bytes = |
881 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 882 | |
dac58241 S |
883 | if (!is_fc) |
884 | goto done; | |
885 | ||
59635018 S |
886 | /* |
887 | * For FC devices retrieve FC HBA data. | |
888 | */ | |
dac58241 S |
889 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
890 | vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; | |
59635018 | 891 | ret = storvsc_execute_vstor_op(device, request, true); |
dac58241 S |
892 | if (ret != 0) |
893 | return ret; | |
894 | ||
dac58241 S |
895 | /* |
896 | * Cache the currently active port and node ww names. | |
897 | */ | |
898 | cache_wwn(stor_device, vstor_packet); | |
899 | ||
900 | done: | |
901 | ||
8dcf37d4 S |
902 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
903 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
59635018 | 904 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 905 | if (ret != 0) |
dac58241 | 906 | return ret; |
8dcf37d4 | 907 | |
6f94d5de S |
908 | if (process_sub_channels) |
909 | handle_multichannel_storage(device, max_chns); | |
910 | ||
8dcf37d4 S |
911 | return ret; |
912 | } | |
913 | ||
c50bd448 S |
914 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
915 | struct scsi_cmnd *scmnd, | |
916 | struct Scsi_Host *host, | |
917 | u8 asc, u8 ascq) | |
918 | { | |
919 | struct storvsc_scan_work *wrk; | |
920 | void (*process_err_fn)(struct work_struct *work); | |
921 | bool do_work = false; | |
922 | ||
3209f9d7 | 923 | switch (SRB_STATUS(vm_srb->srb_status)) { |
c50bd448 S |
924 | case SRB_STATUS_ERROR: |
925 | /* | |
926 | * If there is an error; offline the device since all | |
927 | * error recovery strategies would have already been | |
928 | * deployed on the host side. However, if the command | |
929 | * were a pass-through command deal with it appropriately. | |
930 | */ | |
931 | switch (scmnd->cmnd[0]) { | |
932 | case ATA_16: | |
933 | case ATA_12: | |
934 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
935 | break; | |
3533f860 S |
936 | /* |
937 | * On Some Windows hosts TEST_UNIT_READY command can return | |
938 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
939 | * based on the sense information. | |
940 | */ | |
941 | case TEST_UNIT_READY: | |
942 | break; | |
c50bd448 S |
943 | default: |
944 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
945 | } | |
946 | break; | |
947 | case SRB_STATUS_INVALID_LUN: | |
948 | do_work = true; | |
949 | process_err_fn = storvsc_remove_lun; | |
950 | break; | |
ff06c5ff VK |
951 | case SRB_STATUS_ABORTED: |
952 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && | |
953 | (asc == 0x2a) && (ascq == 0x9)) { | |
6781209e S |
954 | do_work = true; |
955 | process_err_fn = storvsc_device_scan; | |
956 | /* | |
957 | * Retry the I/O that trigerred this. | |
958 | */ | |
959 | set_host_byte(scmnd, DID_REQUEUE); | |
960 | } | |
961 | break; | |
c50bd448 | 962 | } |
6781209e | 963 | |
c50bd448 S |
964 | if (!do_work) |
965 | return; | |
966 | ||
967 | /* | |
968 | * We need to schedule work to process this error; schedule it. | |
969 | */ | |
970 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
971 | if (!wrk) { | |
972 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
973 | return; | |
974 | } | |
975 | ||
976 | wrk->host = host; | |
977 | wrk->lun = vm_srb->lun; | |
98441221 | 978 | wrk->tgt_id = vm_srb->target_id; |
c50bd448 S |
979 | INIT_WORK(&wrk->work, process_err_fn); |
980 | schedule_work(&wrk->work); | |
981 | } | |
982 | ||
2707388c | 983 | |
03996f20 S |
984 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
985 | struct storvsc_device *stor_dev) | |
8dcf37d4 | 986 | { |
2707388c | 987 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
2707388c S |
988 | struct scsi_sense_hdr sense_hdr; |
989 | struct vmscsi_request *vm_srb; | |
c50bd448 | 990 | struct Scsi_Host *host; |
be0cf6ca S |
991 | u32 payload_sz = cmd_request->payload_sz; |
992 | void *payload = cmd_request->payload; | |
c50bd448 | 993 | |
c50bd448 | 994 | host = stor_dev->host; |
8dcf37d4 | 995 | |
61eaffc9 | 996 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8dcf37d4 | 997 | |
42e22cac S |
998 | scmnd->result = vm_srb->scsi_status; |
999 | ||
2707388c S |
1000 | if (scmnd->result) { |
1001 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
f8aea701 | 1002 | SCSI_SENSE_BUFFERSIZE, &sense_hdr) && |
84b342c0 CA |
1003 | !(sense_hdr.sense_key == NOT_READY && |
1004 | sense_hdr.asc == 0x03A) && | |
f8aea701 | 1005 | do_logging(STORVSC_LOGGING_ERROR)) |
d811b848 HR |
1006 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1007 | &sense_hdr); | |
2707388c S |
1008 | } |
1009 | ||
c50bd448 S |
1010 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) |
1011 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, | |
1012 | sense_hdr.ascq); | |
1013 | ||
2707388c | 1014 | scsi_set_resid(scmnd, |
be0cf6ca | 1015 | cmd_request->payload->range.len - |
2707388c S |
1016 | vm_srb->data_transfer_length); |
1017 | ||
ead3700d | 1018 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
1019 | |
1020 | if (payload_sz > | |
1021 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1022 | kfree(payload); | |
2707388c S |
1023 | } |
1024 | ||
03996f20 | 1025 | static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
2707388c | 1026 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1027 | struct storvsc_cmd_request *request) |
2707388c | 1028 | { |
2707388c | 1029 | struct vstor_packet *stor_pkt; |
03996f20 | 1030 | struct hv_device *device = stor_device->device; |
2707388c | 1031 | |
2707388c S |
1032 | stor_pkt = &request->vstor_packet; |
1033 | ||
1034 | /* | |
1035 | * The current SCSI handling on the host side does | |
1036 | * not correctly handle: | |
1037 | * INQUIRY command with page code parameter set to 0x80 | |
1038 | * MODE_SENSE command with cmd[2] == 0x1c | |
1039 | * | |
1040 | * Setup srb and scsi status so this won't be fatal. | |
1041 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1042 | * (srb status == 0x4) and off-line the device in that case. |
1043 | */ | |
1044 | ||
1045 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1046 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1047 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1048 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1049 | } |
1050 | ||
8dcf37d4 S |
1051 | |
1052 | /* Copy over the status...etc */ | |
1053 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1054 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
1055 | stor_pkt->vm_srb.sense_info_length = | |
1056 | vstor_packet->vm_srb.sense_info_length; | |
1057 | ||
f8aea701 LL |
1058 | if (vstor_packet->vm_srb.scsi_status != 0 || |
1059 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) | |
1060 | storvsc_log(device, STORVSC_LOGGING_WARN, | |
1061 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
1062 | stor_pkt->vm_srb.cdb[0], | |
1063 | vstor_packet->vm_srb.scsi_status, | |
1064 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
1065 | |
1066 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1067 | /* CHECK_CONDITION */ | |
16046320 S |
1068 | if (vstor_packet->vm_srb.srb_status & |
1069 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1070 | /* autosense data available */ |
8dcf37d4 | 1071 | |
f8aea701 LL |
1072 | storvsc_log(device, STORVSC_LOGGING_WARN, |
1073 | "stor pkt %p autosense data valid - len %d\n", | |
1074 | request, vstor_packet->vm_srb.sense_info_length); | |
1075 | ||
ead3700d | 1076 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1077 | vstor_packet->vm_srb.sense_data, |
1078 | vstor_packet->vm_srb.sense_info_length); | |
1079 | ||
1080 | } | |
1081 | } | |
1082 | ||
1083 | stor_pkt->vm_srb.data_transfer_length = | |
1084 | vstor_packet->vm_srb.data_transfer_length; | |
1085 | ||
03996f20 | 1086 | storvsc_command_completion(request, stor_device); |
8dcf37d4 S |
1087 | |
1088 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1089 | stor_device->drain_notify) | |
1090 | wake_up(&stor_device->waiting_to_drain); | |
1091 | ||
1092 | ||
1093 | } | |
1094 | ||
03996f20 | 1095 | static void storvsc_on_receive(struct storvsc_device *stor_device, |
8dcf37d4 | 1096 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1097 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1098 | { |
12675799 | 1099 | struct storvsc_scan_work *work; |
12675799 | 1100 | |
8dcf37d4 S |
1101 | switch (vstor_packet->operation) { |
1102 | case VSTOR_OPERATION_COMPLETE_IO: | |
03996f20 | 1103 | storvsc_on_io_completion(stor_device, vstor_packet, request); |
8dcf37d4 | 1104 | break; |
12675799 | 1105 | |
8dcf37d4 | 1106 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 | 1107 | case VSTOR_OPERATION_ENUMERATE_BUS: |
12675799 S |
1108 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); |
1109 | if (!work) | |
1110 | return; | |
1111 | ||
2a09ed3d | 1112 | INIT_WORK(&work->work, storvsc_host_scan); |
12675799 S |
1113 | work->host = stor_device->host; |
1114 | schedule_work(&work->work); | |
1115 | break; | |
8dcf37d4 | 1116 | |
dac58241 | 1117 | case VSTOR_OPERATION_FCHBA_DATA: |
dac58241 S |
1118 | cache_wwn(stor_device, vstor_packet); |
1119 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1120 | fc_host_node_name(stor_device->host) = stor_device->node_name; | |
1121 | fc_host_port_name(stor_device->host) = stor_device->port_name; | |
1122 | #endif | |
1123 | break; | |
8dcf37d4 S |
1124 | default: |
1125 | break; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | static void storvsc_on_channel_callback(void *context) | |
1130 | { | |
6f94d5de S |
1131 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
1132 | struct hv_device *device; | |
8dcf37d4 S |
1133 | struct storvsc_device *stor_device; |
1134 | u32 bytes_recvd; | |
1135 | u64 request_id; | |
1136 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
61eaffc9 | 1137 | struct storvsc_cmd_request *request; |
8dcf37d4 S |
1138 | int ret; |
1139 | ||
6f94d5de S |
1140 | if (channel->primary_channel != NULL) |
1141 | device = channel->primary_channel->device_obj; | |
1142 | else | |
1143 | device = channel->device_obj; | |
8dcf37d4 S |
1144 | |
1145 | stor_device = get_in_stor_device(device); | |
1146 | if (!stor_device) | |
1147 | return; | |
1148 | ||
1149 | do { | |
6f94d5de | 1150 | ret = vmbus_recvpacket(channel, packet, |
8b612fa2 S |
1151 | ALIGN((sizeof(struct vstor_packet) - |
1152 | vmscsi_size_delta), 8), | |
8dcf37d4 S |
1153 | &bytes_recvd, &request_id); |
1154 | if (ret == 0 && bytes_recvd > 0) { | |
1155 | ||
61eaffc9 | 1156 | request = (struct storvsc_cmd_request *) |
8dcf37d4 S |
1157 | (unsigned long)request_id; |
1158 | ||
1159 | if ((request == &stor_device->init_request) || | |
1160 | (request == &stor_device->reset_request)) { | |
1161 | ||
1162 | memcpy(&request->vstor_packet, packet, | |
8b612fa2 S |
1163 | (sizeof(struct vstor_packet) - |
1164 | vmscsi_size_delta)); | |
8dcf37d4 S |
1165 | complete(&request->wait_event); |
1166 | } else { | |
03996f20 | 1167 | storvsc_on_receive(stor_device, |
8dcf37d4 S |
1168 | (struct vstor_packet *)packet, |
1169 | request); | |
1170 | } | |
1171 | } else { | |
1172 | break; | |
1173 | } | |
1174 | } while (1); | |
1175 | ||
1176 | return; | |
1177 | } | |
1178 | ||
dac58241 S |
1179 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
1180 | bool is_fc) | |
8dcf37d4 S |
1181 | { |
1182 | struct vmstorage_channel_properties props; | |
1183 | int ret; | |
1184 | ||
1185 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1186 | ||
8dcf37d4 S |
1187 | ret = vmbus_open(device->channel, |
1188 | ring_size, | |
1189 | ring_size, | |
1190 | (void *)&props, | |
1191 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1192 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1193 | |
1194 | if (ret != 0) | |
1195 | return ret; | |
1196 | ||
dac58241 | 1197 | ret = storvsc_channel_init(device, is_fc); |
8dcf37d4 S |
1198 | |
1199 | return ret; | |
1200 | } | |
1201 | ||
c1b3d067 | 1202 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1203 | { |
1204 | struct storvsc_device *stor_device; | |
1205 | unsigned long flags; | |
1206 | ||
cd654ea1 | 1207 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1208 | |
1209 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1210 | stor_device->destroy = true; | |
1211 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1212 | ||
1213 | /* | |
1214 | * At this point, all outbound traffic should be disable. We | |
1215 | * only allow inbound traffic (responses) to proceed so that | |
1216 | * outstanding requests can be completed. | |
1217 | */ | |
1218 | ||
1219 | storvsc_wait_to_drain(stor_device); | |
1220 | ||
1221 | /* | |
1222 | * Since we have already drained, we don't need to busy wait | |
1223 | * as was done in final_release_stor_device() | |
1224 | * Note that we cannot set the ext pointer to NULL until | |
1225 | * we have drained - to drain the outgoing packets, we need to | |
1226 | * allow incoming packets. | |
1227 | */ | |
1228 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1229 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1230 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1231 | ||
1232 | /* Close the channel */ | |
1233 | vmbus_close(device->channel); | |
1234 | ||
e8e0332e | 1235 | kfree(stor_device->stor_chns); |
8dcf37d4 S |
1236 | kfree(stor_device); |
1237 | return 0; | |
1238 | } | |
1239 | ||
e8e0332e S |
1240 | static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
1241 | u16 q_num) | |
1242 | { | |
1243 | u16 slot = 0; | |
1244 | u16 hash_qnum; | |
1245 | struct cpumask alloced_mask; | |
1246 | int num_channels, tgt_cpu; | |
1247 | ||
1248 | if (stor_device->num_sc == 0) | |
1249 | return stor_device->device->channel; | |
1250 | ||
1251 | /* | |
1252 | * Our channel array is sparsley populated and we | |
1253 | * initiated I/O on a processor/hw-q that does not | |
1254 | * currently have a designated channel. Fix this. | |
1255 | * The strategy is simple: | |
1256 | * I. Ensure NUMA locality | |
1257 | * II. Distribute evenly (best effort) | |
1258 | * III. Mapping is persistent. | |
1259 | */ | |
1260 | ||
1261 | cpumask_and(&alloced_mask, &stor_device->alloced_cpus, | |
1262 | cpumask_of_node(cpu_to_node(q_num))); | |
1263 | ||
1264 | num_channels = cpumask_weight(&alloced_mask); | |
1265 | if (num_channels == 0) | |
1266 | return stor_device->device->channel; | |
1267 | ||
1268 | hash_qnum = q_num; | |
1269 | while (hash_qnum >= num_channels) | |
1270 | hash_qnum -= num_channels; | |
1271 | ||
1272 | for_each_cpu(tgt_cpu, &alloced_mask) { | |
1273 | if (slot == hash_qnum) | |
1274 | break; | |
1275 | slot++; | |
1276 | } | |
1277 | ||
1278 | stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; | |
1279 | ||
1280 | return stor_device->stor_chns[q_num]; | |
1281 | } | |
1282 | ||
1283 | ||
c1b3d067 | 1284 | static int storvsc_do_io(struct hv_device *device, |
e8e0332e | 1285 | struct storvsc_cmd_request *request, u16 q_num) |
8dcf37d4 S |
1286 | { |
1287 | struct storvsc_device *stor_device; | |
1288 | struct vstor_packet *vstor_packet; | |
6f94d5de | 1289 | struct vmbus_channel *outgoing_channel; |
8dcf37d4 | 1290 | int ret = 0; |
e8e0332e S |
1291 | struct cpumask alloced_mask; |
1292 | int tgt_cpu; | |
8dcf37d4 S |
1293 | |
1294 | vstor_packet = &request->vstor_packet; | |
1295 | stor_device = get_out_stor_device(device); | |
1296 | ||
1297 | if (!stor_device) | |
1298 | return -ENODEV; | |
1299 | ||
1300 | ||
1301 | request->device = device; | |
6f94d5de S |
1302 | /* |
1303 | * Select an an appropriate channel to send the request out. | |
1304 | */ | |
1305 | ||
e8e0332e S |
1306 | if (stor_device->stor_chns[q_num] != NULL) { |
1307 | outgoing_channel = stor_device->stor_chns[q_num]; | |
1308 | if (outgoing_channel->target_cpu == smp_processor_id()) { | |
1309 | /* | |
1310 | * Ideally, we want to pick a different channel if | |
1311 | * available on the same NUMA node. | |
1312 | */ | |
1313 | cpumask_and(&alloced_mask, &stor_device->alloced_cpus, | |
1314 | cpumask_of_node(cpu_to_node(q_num))); | |
1315 | for_each_cpu(tgt_cpu, &alloced_mask) { | |
1316 | if (tgt_cpu != outgoing_channel->target_cpu) { | |
1317 | outgoing_channel = | |
1318 | stor_device->stor_chns[tgt_cpu]; | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | } | |
1323 | } else { | |
1324 | outgoing_channel = get_og_chn(stor_device, q_num); | |
1325 | } | |
8dcf37d4 S |
1326 | |
1327 | ||
1328 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1329 | ||
8b612fa2 S |
1330 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
1331 | vmscsi_size_delta); | |
8dcf37d4 S |
1332 | |
1333 | ||
8b612fa2 | 1334 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1335 | |
1336 | ||
1337 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1338 | request->payload->range.len; |
8dcf37d4 S |
1339 | |
1340 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1341 | ||
be0cf6ca S |
1342 | if (request->payload->range.len) { |
1343 | ||
1344 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1345 | request->payload, request->payload_sz, | |
8dcf37d4 | 1346 | vstor_packet, |
8b612fa2 S |
1347 | (sizeof(struct vstor_packet) - |
1348 | vmscsi_size_delta), | |
8dcf37d4 S |
1349 | (unsigned long)request); |
1350 | } else { | |
0147dabc | 1351 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 S |
1352 | (sizeof(struct vstor_packet) - |
1353 | vmscsi_size_delta), | |
8dcf37d4 S |
1354 | (unsigned long)request, |
1355 | VM_PKT_DATA_INBAND, | |
1356 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1357 | } | |
1358 | ||
1359 | if (ret != 0) | |
1360 | return ret; | |
1361 | ||
1362 | atomic_inc(&stor_device->num_outstanding_req); | |
1363 | ||
1364 | return ret; | |
1365 | } | |
1366 | ||
419f2d03 S |
1367 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1368 | { | |
419f2d03 | 1369 | |
419f2d03 | 1370 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 | 1371 | |
893def38 S |
1372 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1373 | ||
81988a0e VK |
1374 | /* Ensure there are no gaps in presented sgls */ |
1375 | blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); | |
1376 | ||
3e8f4f40 OH |
1377 | sdevice->no_write_same = 1; |
1378 | ||
f3cfabce S |
1379 | /* |
1380 | * Add blist flags to permit the reading of the VPD pages even when | |
1381 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1382 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1383 | * With this patch we can correctly handle WRITE_SAME_16 issues. | |
1384 | */ | |
1385 | sdevice->sdev_bflags |= msft_blist_flags; | |
1386 | ||
b0a93d96 S |
1387 | /* |
1388 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1389 | * if the device is a MSFT virtual device. If the host is |
1390 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1391 | */ |
1392 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1393 | switch (vmstor_proto_version) { |
1394 | case VMSTOR_PROTO_VERSION_WIN8: | |
1395 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1396 | sdevice->scsi_level = SCSI_SPC_3; |
1397 | break; | |
1398 | } | |
b95f5be0 KM |
1399 | |
1400 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1401 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1402 | } |
1403 | ||
419f2d03 S |
1404 | return 0; |
1405 | } | |
1406 | ||
62838ce2 S |
1407 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1408 | sector_t capacity, int *info) | |
1409 | { | |
5326fd5c S |
1410 | sector_t nsect = capacity; |
1411 | sector_t cylinders = nsect; | |
1412 | int heads, sectors_pt; | |
62838ce2 | 1413 | |
5326fd5c S |
1414 | /* |
1415 | * We are making up these values; let us keep it simple. | |
1416 | */ | |
1417 | heads = 0xff; | |
1418 | sectors_pt = 0x3f; /* Sectors per track */ | |
1419 | sector_div(cylinders, heads * sectors_pt); | |
1420 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1421 | cylinders = 0xffff; | |
62838ce2 S |
1422 | |
1423 | info[0] = heads; | |
5326fd5c S |
1424 | info[1] = sectors_pt; |
1425 | info[2] = (int)cylinders; | |
62838ce2 | 1426 | |
62838ce2 S |
1427 | return 0; |
1428 | } | |
aa3d789e | 1429 | |
4b270c8b | 1430 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1431 | { |
4b270c8b S |
1432 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1433 | struct hv_device *device = host_dev->dev; | |
1434 | ||
aa3d789e | 1435 | struct storvsc_device *stor_device; |
61eaffc9 | 1436 | struct storvsc_cmd_request *request; |
aa3d789e S |
1437 | struct vstor_packet *vstor_packet; |
1438 | int ret, t; | |
1439 | ||
aa3d789e | 1440 | |
1eaaddf9 | 1441 | stor_device = get_out_stor_device(device); |
aa3d789e | 1442 | if (!stor_device) |
a00e8224 | 1443 | return FAILED; |
aa3d789e S |
1444 | |
1445 | request = &stor_device->reset_request; | |
1446 | vstor_packet = &request->vstor_packet; | |
1447 | ||
1448 | init_completion(&request->wait_event); | |
1449 | ||
1450 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1451 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1452 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1453 | ||
1454 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 S |
1455 | (sizeof(struct vstor_packet) - |
1456 | vmscsi_size_delta), | |
aa3d789e S |
1457 | (unsigned long)&stor_device->reset_request, |
1458 | VM_PKT_DATA_INBAND, | |
1459 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1460 | if (ret != 0) | |
a00e8224 | 1461 | return FAILED; |
aa3d789e | 1462 | |
46d2eb6d | 1463 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1464 | if (t == 0) |
1465 | return TIMEOUT_ERROR; | |
aa3d789e | 1466 | |
aa3d789e S |
1467 | |
1468 | /* | |
1469 | * At this point, all outstanding requests in the adapter | |
1470 | * should have been flushed out and return to us | |
5c1b10ab S |
1471 | * There is a potential race here where the host may be in |
1472 | * the process of responding when we return from here. | |
1473 | * Just wait for all in-transit packets to be accounted for | |
1474 | * before we return from here. | |
aa3d789e | 1475 | */ |
5c1b10ab | 1476 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1477 | |
a00e8224 | 1478 | return SUCCESS; |
aa3d789e S |
1479 | } |
1480 | ||
56b26e69 S |
1481 | /* |
1482 | * The host guarantees to respond to each command, although I/O latencies might | |
1483 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1484 | * chance to perform EH. | |
1485 | */ | |
1486 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1487 | { | |
1488 | return BLK_EH_RESET_TIMER; | |
1489 | } | |
1490 | ||
c77b63b6 | 1491 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1492 | { |
1493 | bool allowed = true; | |
1494 | u8 scsi_op = scmnd->cmnd[0]; | |
1495 | ||
1496 | switch (scsi_op) { | |
3e8f4f40 OH |
1497 | /* the host does not handle WRITE_SAME, log accident usage */ |
1498 | case WRITE_SAME: | |
c77b63b6 S |
1499 | /* |
1500 | * smartd sends this command and the host does not handle | |
1501 | * this. So, don't send it. | |
1502 | */ | |
41098f8f | 1503 | case SET_WINDOW: |
59e00e74 | 1504 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1505 | allowed = false; |
1506 | break; | |
1507 | default: | |
1508 | break; | |
92ae4ebd OH |
1509 | } |
1510 | return allowed; | |
1511 | } | |
c5b463ae | 1512 | |
bab445e1 | 1513 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1514 | { |
1515 | int ret; | |
bab445e1 | 1516 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1517 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1518 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1519 | int i; |
1520 | struct scatterlist *sgl; | |
1521 | unsigned int sg_count = 0; | |
1522 | struct vmscsi_request *vm_srb; | |
aaced993 | 1523 | struct scatterlist *cur_sgl; |
be0cf6ca S |
1524 | struct vmbus_packet_mpb_array *payload; |
1525 | u32 payload_sz; | |
1526 | u32 length; | |
c5b463ae | 1527 | |
2492fd7a | 1528 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1529 | /* |
1530 | * On legacy hosts filter unimplemented commands. | |
1531 | * Future hosts are expected to correctly handle | |
1532 | * unsupported commands. Furthermore, it is | |
1533 | * possible that some of the currently | |
1534 | * unsupported commands maybe supported in | |
1535 | * future versions of the host. | |
1536 | */ | |
1537 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1538 | scmnd->scsi_done(scmnd); | |
1539 | return 0; | |
1540 | } | |
92ae4ebd | 1541 | } |
c5b463ae | 1542 | |
c5b463ae | 1543 | /* Setup the cmd request */ |
c5b463ae S |
1544 | cmd_request->cmd = scmnd; |
1545 | ||
61eaffc9 | 1546 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1547 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1548 | |
f885fb73 | 1549 | vm_srb->win8_extension.srb_flags |= |
8cf308e1 | 1550 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae S |
1551 | |
1552 | /* Build the SRB */ | |
1553 | switch (scmnd->sc_data_direction) { | |
1554 | case DMA_TO_DEVICE: | |
1555 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1556 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1557 | break; |
1558 | case DMA_FROM_DEVICE: | |
1559 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1560 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1561 | break; |
cb1cf080 | 1562 | case DMA_NONE: |
c5b463ae | 1563 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1564 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1565 | break; |
cb1cf080 VK |
1566 | default: |
1567 | /* | |
1568 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1569 | * supposed to see here. | |
1570 | */ | |
1571 | WARN(1, "Unexpected data direction: %d\n", | |
1572 | scmnd->sc_data_direction); | |
1573 | return -EINVAL; | |
c5b463ae S |
1574 | } |
1575 | ||
c5b463ae | 1576 | |
c5b463ae S |
1577 | vm_srb->port_number = host_dev->port; |
1578 | vm_srb->path_id = scmnd->device->channel; | |
1579 | vm_srb->target_id = scmnd->device->id; | |
1580 | vm_srb->lun = scmnd->device->lun; | |
1581 | ||
c5b463ae S |
1582 | vm_srb->cdb_length = scmnd->cmd_len; |
1583 | ||
1584 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1585 | ||
be0cf6ca S |
1586 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1587 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1588 | |
be0cf6ca S |
1589 | length = scsi_bufflen(scmnd); |
1590 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1591 | payload_sz = sizeof(cmd_request->mpb); | |
1592 | ||
1593 | if (sg_count) { | |
be0cf6ca S |
1594 | if (sg_count > MAX_PAGE_BUFFER_COUNT) { |
1595 | ||
b0120d99 | 1596 | payload_sz = (sg_count * sizeof(u64) + |
be0cf6ca | 1597 | sizeof(struct vmbus_packet_mpb_array)); |
b0120d99 | 1598 | payload = kzalloc(payload_sz, GFP_ATOMIC); |
81988a0e VK |
1599 | if (!payload) |
1600 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1601 | } |
1602 | ||
1603 | payload->range.len = length; | |
1604 | payload->range.offset = sgl[0].offset; | |
1605 | ||
aaced993 S |
1606 | cur_sgl = sgl; |
1607 | for (i = 0; i < sg_count; i++) { | |
be0cf6ca | 1608 | payload->range.pfn_array[i] = |
aaced993 S |
1609 | page_to_pfn(sg_page((cur_sgl))); |
1610 | cur_sgl = sg_next(cur_sgl); | |
1611 | } | |
c5b463ae S |
1612 | |
1613 | } else if (scsi_sglist(scmnd)) { | |
be0cf6ca S |
1614 | payload->range.len = length; |
1615 | payload->range.offset = | |
c5b463ae | 1616 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
be0cf6ca | 1617 | payload->range.pfn_array[0] = |
c5b463ae S |
1618 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
1619 | } | |
1620 | ||
be0cf6ca S |
1621 | cmd_request->payload = payload; |
1622 | cmd_request->payload_sz = payload_sz; | |
1623 | ||
c5b463ae | 1624 | /* Invokes the vsc to start an IO */ |
e8e0332e S |
1625 | ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
1626 | put_cpu(); | |
636f0fd1 | 1627 | |
d2598f01 | 1628 | if (ret == -EAGAIN) { |
c5b463ae | 1629 | /* no more space */ |
ead3700d | 1630 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1631 | } |
1632 | ||
c77b63b6 | 1633 | return 0; |
c5b463ae S |
1634 | } |
1635 | ||
bef4a34a | 1636 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1637 | .module = THIS_MODULE, |
1638 | .name = "storvsc_host_t", | |
ead3700d | 1639 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1640 | .bios_param = storvsc_get_chs, |
1641 | .queuecommand = storvsc_queuecommand, | |
1642 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1643 | .proc_name = "storvsc_host", |
56b26e69 | 1644 | .eh_timed_out = storvsc_eh_timed_out, |
ff568d3a | 1645 | .slave_configure = storvsc_device_configure, |
52f9614d | 1646 | .cmd_per_lun = 255, |
ff568d3a | 1647 | .this_id = -1, |
be0cf6ca | 1648 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1649 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1650 | .dma_boundary = PAGE_SIZE-1, |
54b2b50c | 1651 | .no_write_same = 1, |
41f46e28 | 1652 | .track_queue_depth = 1, |
bef4a34a HJ |
1653 | }; |
1654 | ||
ef52a81b S |
1655 | enum { |
1656 | SCSI_GUID, | |
1657 | IDE_GUID, | |
bde6d0f9 | 1658 | SFC_GUID, |
ef52a81b S |
1659 | }; |
1660 | ||
d847b5fe | 1661 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1662 | /* SCSI guid */ |
35c3bc20 S |
1663 | { HV_SCSI_GUID, |
1664 | .driver_data = SCSI_GUID | |
1665 | }, | |
21e37742 | 1666 | /* IDE guid */ |
35c3bc20 S |
1667 | { HV_IDE_GUID, |
1668 | .driver_data = IDE_GUID | |
1669 | }, | |
bde6d0f9 S |
1670 | /* Fibre Channel GUID */ |
1671 | { | |
1672 | HV_SYNTHFC_GUID, | |
1673 | .driver_data = SFC_GUID | |
1674 | }, | |
c45cf2d4 | 1675 | { }, |
d847b5fe | 1676 | }; |
bef4a34a | 1677 | |
d847b5fe | 1678 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1679 | |
84946899 S |
1680 | static int storvsc_probe(struct hv_device *device, |
1681 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1682 | { |
ff568d3a | 1683 | int ret; |
f458aada | 1684 | int num_cpus = num_online_cpus(); |
bef4a34a | 1685 | struct Scsi_Host *host; |
795b613d | 1686 | struct hv_host_device *host_dev; |
ef52a81b | 1687 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
dac58241 | 1688 | bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
bd1f5d6a | 1689 | int target = 0; |
6e4198ce | 1690 | struct storvsc_device *stor_device; |
0fb8db29 S |
1691 | int max_luns_per_target; |
1692 | int max_targets; | |
1693 | int max_channels; | |
f458aada | 1694 | int max_sub_channels = 0; |
bd1f5d6a | 1695 | |
8b612fa2 S |
1696 | /* |
1697 | * Based on the windows host we are running on, | |
1698 | * set state to properly communicate with the host. | |
1699 | */ | |
1700 | ||
6ee5c615 | 1701 | if (vmbus_proto_version < VERSION_WIN8) { |
0fb8db29 S |
1702 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1703 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1704 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1705 | } else { |
0fb8db29 S |
1706 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1707 | max_targets = STORVSC_MAX_TARGETS; | |
1708 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada S |
1709 | /* |
1710 | * On Windows8 and above, we support sub-channels for storage. | |
1711 | * The number of sub-channels offerred is based on the number of | |
1712 | * VCPUs in the guest. | |
1713 | */ | |
1714 | max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); | |
8b612fa2 S |
1715 | } |
1716 | ||
f458aada S |
1717 | scsi_driver.can_queue = (max_outstanding_req_per_channel * |
1718 | (max_sub_channels + 1)); | |
1719 | ||
ff568d3a | 1720 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1721 | sizeof(struct hv_host_device)); |
f8feed06 | 1722 | if (!host) |
bef4a34a | 1723 | return -ENOMEM; |
bef4a34a | 1724 | |
7f33f30a | 1725 | host_dev = shost_priv(host); |
795b613d | 1726 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1727 | |
795b613d | 1728 | host_dev->port = host->host_no; |
97c15296 | 1729 | host_dev->dev = device; |
bef4a34a | 1730 | |
4e03e697 | 1731 | |
a13d35ab | 1732 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1733 | if (!stor_device) { |
225ce6ea | 1734 | ret = -ENOMEM; |
ce3e301c | 1735 | goto err_out0; |
6e4198ce | 1736 | } |
9efd21e1 | 1737 | |
a13d35ab | 1738 | stor_device->destroy = false; |
6f94d5de | 1739 | stor_device->open_sub_channel = false; |
a13d35ab S |
1740 | init_waitqueue_head(&stor_device->waiting_to_drain); |
1741 | stor_device->device = device; | |
cd654ea1 S |
1742 | stor_device->host = host; |
1743 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1744 | |
6e4198ce | 1745 | stor_device->port_number = host->host_no; |
dac58241 | 1746 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
225ce6ea | 1747 | if (ret) |
ce3e301c | 1748 | goto err_out1; |
bef4a34a | 1749 | |
6e4198ce S |
1750 | host_dev->path = stor_device->path_id; |
1751 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1752 | |
4cd83ecd S |
1753 | switch (dev_id->driver_data) { |
1754 | case SFC_GUID: | |
1755 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1756 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1757 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
dac58241 S |
1758 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1759 | host->transportt = fc_transport_template; | |
1760 | #endif | |
4cd83ecd S |
1761 | break; |
1762 | ||
1763 | case SCSI_GUID: | |
0fb8db29 S |
1764 | host->max_lun = max_luns_per_target; |
1765 | host->max_id = max_targets; | |
1766 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1767 | break; |
1768 | ||
1769 | default: | |
1770 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1771 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1772 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1773 | break; | |
1774 | } | |
cf55f4a8 MS |
1775 | /* max cmd length */ |
1776 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1777 | |
be0cf6ca S |
1778 | /* |
1779 | * set the table size based on the info we got | |
1780 | * from the host. | |
1781 | */ | |
1782 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
c16d318f JS |
1783 | #if defined(CONFIG_X86_32) |
1784 | dev_warn(&device->device, "adjusting sg_tablesize 0x%x -> 0x%x", | |
1785 | host->sg_tablesize, MAX_MULTIPAGE_BUFFER_COUNT); | |
1786 | host->sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT; | |
1787 | #endif | |
e8e0332e S |
1788 | /* |
1789 | * Set the number of HW queues we are supporting. | |
1790 | */ | |
1791 | if (stor_device->num_sc != 0) | |
1792 | host->nr_hw_queues = stor_device->num_sc + 1; | |
be0cf6ca | 1793 | |
454f18a9 | 1794 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1795 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1796 | if (ret != 0) |
ce3e301c | 1797 | goto err_out2; |
bef4a34a | 1798 | |
bd1f5d6a S |
1799 | if (!dev_is_ide) { |
1800 | scsi_scan_host(host); | |
59d22950 S |
1801 | } else { |
1802 | target = (device->dev_instance.b[5] << 8 | | |
1803 | device->dev_instance.b[4]); | |
1804 | ret = scsi_add_device(host, 0, target, 0); | |
1805 | if (ret) { | |
1806 | scsi_remove_host(host); | |
1807 | goto err_out2; | |
1808 | } | |
bef4a34a | 1809 | } |
dac58241 S |
1810 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1811 | if (host->transportt == fc_transport_template) { | |
1812 | fc_host_node_name(host) = stor_device->node_name; | |
1813 | fc_host_port_name(host) = stor_device->port_name; | |
1814 | } | |
1815 | #endif | |
bd1f5d6a | 1816 | return 0; |
bef4a34a | 1817 | |
ce3e301c | 1818 | err_out2: |
225ce6ea S |
1819 | /* |
1820 | * Once we have connected with the host, we would need to | |
1821 | * to invoke storvsc_dev_remove() to rollback this state and | |
1822 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1823 | * err_out1 label. |
225ce6ea | 1824 | */ |
bd1f5d6a | 1825 | storvsc_dev_remove(device); |
ce3e301c | 1826 | goto err_out0; |
225ce6ea S |
1827 | |
1828 | err_out1: | |
e8e0332e | 1829 | kfree(stor_device->stor_chns); |
ce3e301c | 1830 | kfree(stor_device); |
225ce6ea S |
1831 | |
1832 | err_out0: | |
bd1f5d6a | 1833 | scsi_host_put(host); |
225ce6ea | 1834 | return ret; |
bef4a34a HJ |
1835 | } |
1836 | ||
ddcbf65e S |
1837 | static int storvsc_remove(struct hv_device *dev) |
1838 | { | |
1839 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1840 | struct Scsi_Host *host = stor_device->host; | |
1841 | ||
dac58241 S |
1842 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1843 | if (host->transportt == fc_transport_template) | |
1844 | fc_remove_host(host); | |
1845 | #endif | |
ddcbf65e S |
1846 | scsi_remove_host(host); |
1847 | storvsc_dev_remove(dev); | |
1848 | scsi_host_put(host); | |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
40bf63ed | 1853 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1854 | .name = KBUILD_MODNAME, |
d847b5fe | 1855 | .id_table = id_table, |
40bf63ed S |
1856 | .probe = storvsc_probe, |
1857 | .remove = storvsc_remove, | |
39ae6fae | 1858 | }; |
7bd05b91 | 1859 | |
dac58241 S |
1860 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1861 | static struct fc_function_template fc_transport_functions = { | |
1862 | .show_host_node_name = 1, | |
1863 | .show_host_port_name = 1, | |
1864 | }; | |
1865 | #endif | |
1866 | ||
d9bbae83 | 1867 | static int __init storvsc_drv_init(void) |
f5c78872 | 1868 | { |
dac58241 | 1869 | int ret; |
01415ab3 S |
1870 | |
1871 | /* | |
1872 | * Divide the ring buffer data size (which is 1 page less | |
1873 | * than the ring buffer size since that page is reserved for | |
1874 | * the ring buffer indices) by the max request size (which is | |
1875 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1876 | */ | |
01415ab3 | 1877 | max_outstanding_req_per_channel = |
768fa219 GKH |
1878 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1879 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
8b612fa2 S |
1880 | sizeof(struct vstor_packet) + sizeof(u64) - |
1881 | vmscsi_size_delta, | |
768fa219 | 1882 | sizeof(u64))); |
f5c78872 | 1883 | |
dac58241 S |
1884 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1885 | fc_transport_template = fc_attach_transport(&fc_transport_functions); | |
1886 | if (!fc_transport_template) | |
1887 | return -ENODEV; | |
d791a8c6 S |
1888 | |
1889 | /* | |
1890 | * Install Hyper-V specific timeout handler. | |
1891 | */ | |
1892 | fc_transport_template->eh_timed_out = storvsc_eh_timed_out; | |
dac58241 S |
1893 | #endif |
1894 | ||
1895 | ret = vmbus_driver_register(&storvsc_drv); | |
1896 | ||
1897 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1898 | if (ret) | |
1899 | fc_release_transport(fc_transport_template); | |
1900 | #endif | |
1901 | ||
1902 | return ret; | |
f5c78872 S |
1903 | } |
1904 | ||
c63ba9e1 | 1905 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1906 | { |
768fa219 | 1907 | vmbus_driver_unregister(&storvsc_drv); |
dac58241 S |
1908 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1909 | fc_release_transport(fc_transport_template); | |
1910 | #endif | |
f5c78872 S |
1911 | } |
1912 | ||
ff568d3a | 1913 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 1914 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1915 | module_init(storvsc_drv_init); |
c63ba9e1 | 1916 | module_exit(storvsc_drv_exit); |