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3b20eb23 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bef4a34a | 2 | /* |
bef4a34a HJ |
3 | * Copyright (c) 2009, Microsoft Corporation. |
4 | * | |
bef4a34a HJ |
5 | * Authors: |
6 | * Haiyang Zhang <haiyangz@microsoft.com> | |
7 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 8 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 9 | */ |
a1be1706 S |
10 | |
11 | #include <linux/kernel.h> | |
f0d79fe9 | 12 | #include <linux/wait.h> |
a1be1706 S |
13 | #include <linux/sched.h> |
14 | #include <linux/completion.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/delay.h> | |
bef4a34a | 18 | #include <linux/init.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
bef4a34a HJ |
20 | #include <linux/module.h> |
21 | #include <linux/device.h> | |
46a97191 | 22 | #include <linux/hyperv.h> |
56b26e69 | 23 | #include <linux/blkdev.h> |
bef4a34a HJ |
24 | #include <scsi/scsi.h> |
25 | #include <scsi/scsi_cmnd.h> | |
26 | #include <scsi/scsi_host.h> | |
27 | #include <scsi/scsi_device.h> | |
28 | #include <scsi/scsi_tcq.h> | |
29 | #include <scsi/scsi_eh.h> | |
30 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 31 | #include <scsi/scsi_dbg.h> |
dac58241 | 32 | #include <scsi/scsi_transport_fc.h> |
d791a8c6 | 33 | #include <scsi/scsi_transport.h> |
3f335ea2 | 34 | |
09f0355f | 35 | /* |
af9584b8 S |
36 | * All wire protocol details (storage protocol between the guest and the host) |
37 | * are consolidated here. | |
38 | * | |
39 | * Begin protocol definitions. | |
09f0355f S |
40 | */ |
41 | ||
09f0355f S |
42 | /* |
43 | * Version history: | |
44 | * V1 Beta: 0.1 | |
45 | * V1 RC < 2008/1/31: 1.0 | |
46 | * V1 RC > 2008/1/31: 2.0 | |
47 | * Win7: 4.2 | |
8b612fa2 | 48 | * Win8: 5.1 |
1a363108 KM |
49 | * Win8.1: 6.0 |
50 | * Win10: 6.2 | |
09f0355f S |
51 | */ |
52 | ||
2492fd7a KM |
53 | #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
54 | (((MINOR_) & 0xff))) | |
8b612fa2 | 55 | |
1a363108 | 56 | #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
2492fd7a KM |
57 | #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
58 | #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) | |
1a363108 KM |
59 | #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
60 | #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) | |
f0d79fe9 | 61 | |
f0d79fe9 S |
62 | /* Packet structure describing virtual storage requests. */ |
63 | enum vstor_packet_operation { | |
64 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
65 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
66 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
67 | VSTOR_OPERATION_RESET_LUN = 4, | |
68 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
69 | VSTOR_OPERATION_RESET_BUS = 6, | |
70 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
71 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
72 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
73 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 74 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
75 | VSTOR_OPERATION_FCHBA_DATA = 12, |
76 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
77 | VSTOR_OPERATION_MAXIMUM = 13 | |
78 | }; | |
79 | ||
80 | /* | |
81 | * WWN packet for Fibre Channel HBA | |
82 | */ | |
83 | ||
84 | struct hv_fc_wwn_packet { | |
83d1e8b9 S |
85 | u8 primary_active; |
86 | u8 reserved1[3]; | |
8b612fa2 S |
87 | u8 primary_port_wwn[8]; |
88 | u8 primary_node_wwn[8]; | |
89 | u8 secondary_port_wwn[8]; | |
90 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
91 | }; |
92 | ||
8b612fa2 S |
93 | |
94 | ||
95 | /* | |
96 | * SRB Flag Bits | |
97 | */ | |
98 | ||
99 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
100 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
101 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
102 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
103 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
104 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
105 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
106 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
107 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
108 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
109 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
110 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
111 | ||
112 | /* | |
113 | * This flag indicates the request is part of the workflow for processing a D3. | |
114 | */ | |
115 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
116 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
117 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
118 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
119 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
120 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
121 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
122 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
123 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
124 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
125 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
126 | ||
3cd6d3d9 LL |
127 | #define SP_UNTAGGED ((unsigned char) ~0) |
128 | #define SRB_SIMPLE_TAG_REQUEST 0x20 | |
8b612fa2 | 129 | |
f0d79fe9 S |
130 | /* |
131 | * Platform neutral description of a scsi request - | |
132 | * this remains the same across the write regardless of 32/64 bit | |
133 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
134 | */ | |
6b2f9495 | 135 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 S |
136 | |
137 | #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 | |
138 | #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 | |
139 | ||
140 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 | |
6b2f9495 | 141 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 142 | |
8b612fa2 S |
143 | /* |
144 | * Sense buffer size changed in win8; have a run-time | |
cb11fead KM |
145 | * variable to track the size we should use. This value will |
146 | * likely change during protocol negotiation but it is valid | |
147 | * to start by assuming pre-Win8. | |
8b612fa2 | 148 | */ |
cb11fead | 149 | static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
8b612fa2 S |
150 | |
151 | /* | |
cb11fead KM |
152 | * The storage protocol version is determined during the |
153 | * initial exchange with the host. It will indicate which | |
154 | * storage functionality is available in the host. | |
155 | */ | |
2492fd7a | 156 | static int vmstor_proto_version; |
8b612fa2 | 157 | |
f8aea701 LL |
158 | #define STORVSC_LOGGING_NONE 0 |
159 | #define STORVSC_LOGGING_ERROR 1 | |
160 | #define STORVSC_LOGGING_WARN 2 | |
161 | ||
162 | static int logging_level = STORVSC_LOGGING_ERROR; | |
163 | module_param(logging_level, int, S_IRUGO|S_IWUSR); | |
164 | MODULE_PARM_DESC(logging_level, | |
165 | "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); | |
166 | ||
167 | static inline bool do_logging(int level) | |
168 | { | |
169 | return logging_level >= level; | |
170 | } | |
171 | ||
172 | #define storvsc_log(dev, level, fmt, ...) \ | |
173 | do { \ | |
174 | if (do_logging(level)) \ | |
175 | dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ | |
176 | } while (0) | |
177 | ||
8b612fa2 S |
178 | struct vmscsi_win8_extension { |
179 | /* | |
180 | * The following were added in Windows 8 | |
181 | */ | |
182 | u16 reserve; | |
183 | u8 queue_tag; | |
184 | u8 queue_action; | |
185 | u32 srb_flags; | |
186 | u32 time_out_value; | |
187 | u32 queue_sort_ey; | |
188 | } __packed; | |
189 | ||
f0d79fe9 | 190 | struct vmscsi_request { |
c649114a S |
191 | u16 length; |
192 | u8 srb_status; | |
193 | u8 scsi_status; | |
f0d79fe9 | 194 | |
c649114a S |
195 | u8 port_number; |
196 | u8 path_id; | |
197 | u8 target_id; | |
198 | u8 lun; | |
f0d79fe9 | 199 | |
c649114a S |
200 | u8 cdb_length; |
201 | u8 sense_info_length; | |
202 | u8 data_in; | |
203 | u8 reserved; | |
f0d79fe9 | 204 | |
c649114a | 205 | u32 data_transfer_length; |
f0d79fe9 S |
206 | |
207 | union { | |
6b2f9495 S |
208 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
209 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
210 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 211 | }; |
8b612fa2 S |
212 | /* |
213 | * The following was added in win8. | |
214 | */ | |
215 | struct vmscsi_win8_extension win8_extension; | |
216 | ||
f0d79fe9 S |
217 | } __attribute((packed)); |
218 | ||
1a363108 KM |
219 | /* |
220 | * The list of storage protocols in order of preference. | |
221 | */ | |
222 | struct vmstor_protocol { | |
223 | int protocol_version; | |
224 | int sense_buffer_size; | |
225 | int vmscsi_size_delta; | |
226 | }; | |
227 | ||
228 | ||
229 | static const struct vmstor_protocol vmstor_protocols[] = { | |
230 | { | |
231 | VMSTOR_PROTO_VERSION_WIN10, | |
232 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
233 | 0 | |
234 | }, | |
235 | { | |
236 | VMSTOR_PROTO_VERSION_WIN8_1, | |
237 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
238 | 0 | |
239 | }, | |
240 | { | |
241 | VMSTOR_PROTO_VERSION_WIN8, | |
242 | POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, | |
243 | 0 | |
244 | }, | |
245 | { | |
246 | VMSTOR_PROTO_VERSION_WIN7, | |
247 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
248 | sizeof(struct vmscsi_win8_extension), | |
249 | }, | |
250 | { | |
251 | VMSTOR_PROTO_VERSION_WIN6, | |
252 | PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, | |
253 | sizeof(struct vmscsi_win8_extension), | |
254 | } | |
255 | }; | |
256 | ||
257 | ||
f0d79fe9 | 258 | /* |
183b8021 | 259 | * This structure is sent during the initialization phase to get the different |
f0d79fe9 S |
260 | * properties of the channel. |
261 | */ | |
8b612fa2 S |
262 | |
263 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
264 | ||
f0d79fe9 | 265 | struct vmstorage_channel_properties { |
8b612fa2 S |
266 | u32 reserved; |
267 | u16 max_channel_cnt; | |
268 | u16 reserved1; | |
f0d79fe9 | 269 | |
8b612fa2 | 270 | u32 flags; |
c649114a | 271 | u32 max_transfer_bytes; |
f0d79fe9 | 272 | |
8b612fa2 | 273 | u64 reserved2; |
f0d79fe9 S |
274 | } __packed; |
275 | ||
276 | /* This structure is sent during the storage protocol negotiations. */ | |
277 | struct vmstorage_protocol_version { | |
278 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 279 | u16 major_minor; |
f0d79fe9 S |
280 | |
281 | /* | |
282 | * Revision number is auto-incremented whenever this file is changed | |
283 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
284 | * definitely indicate incompatibility--but it does indicate mismatched | |
285 | * builds. | |
c649114a | 286 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 287 | */ |
85904a5e | 288 | u16 revision; |
f0d79fe9 S |
289 | } __packed; |
290 | ||
291 | /* Channel Property Flags */ | |
292 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
293 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
294 | ||
295 | struct vstor_packet { | |
296 | /* Requested operation type */ | |
297 | enum vstor_packet_operation operation; | |
298 | ||
299 | /* Flags - see below for values */ | |
c649114a | 300 | u32 flags; |
f0d79fe9 S |
301 | |
302 | /* Status of the request returned from the server side. */ | |
c649114a | 303 | u32 status; |
f0d79fe9 S |
304 | |
305 | /* Data payload area */ | |
306 | union { | |
307 | /* | |
308 | * Structure used to forward SCSI commands from the | |
309 | * client to the server. | |
310 | */ | |
311 | struct vmscsi_request vm_srb; | |
312 | ||
313 | /* Structure used to query channel properties. */ | |
314 | struct vmstorage_channel_properties storage_channel_properties; | |
315 | ||
316 | /* Used during version negotiations. */ | |
317 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
318 | |
319 | /* Fibre channel address packet */ | |
320 | struct hv_fc_wwn_packet wwn_packet; | |
321 | ||
322 | /* Number of sub-channels to create */ | |
323 | u16 sub_channel_count; | |
324 | ||
325 | /* This will be the maximum of the union members */ | |
326 | u8 buffer[0x34]; | |
f0d79fe9 S |
327 | }; |
328 | } __packed; | |
329 | ||
f0d79fe9 | 330 | /* |
09f0355f S |
331 | * Packet Flags: |
332 | * | |
f0d79fe9 S |
333 | * This flag indicates that the server should send back a completion for this |
334 | * packet. | |
335 | */ | |
09f0355f | 336 | |
f0d79fe9 S |
337 | #define REQUEST_COMPLETION_FLAG 0x1 |
338 | ||
f0d79fe9 S |
339 | /* Matches Windows-end */ |
340 | enum storvsc_request_type { | |
c649114a | 341 | WRITE_TYPE = 0, |
f0d79fe9 S |
342 | READ_TYPE, |
343 | UNKNOWN_TYPE, | |
344 | }; | |
345 | ||
16046320 S |
346 | /* |
347 | * SRB status codes and masks; a subset of the codes used here. | |
348 | */ | |
349 | ||
350 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
3209f9d7 | 351 | #define SRB_STATUS_QUEUE_FROZEN 0x40 |
16046320 S |
352 | #define SRB_STATUS_INVALID_LUN 0x20 |
353 | #define SRB_STATUS_SUCCESS 0x01 | |
6781209e | 354 | #define SRB_STATUS_ABORTED 0x02 |
16046320 | 355 | #define SRB_STATUS_ERROR 0x04 |
40630f46 | 356 | #define SRB_STATUS_DATA_OVERRUN 0x12 |
16046320 | 357 | |
3209f9d7 S |
358 | #define SRB_STATUS(status) \ |
359 | (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) | |
af9584b8 S |
360 | /* |
361 | * This is the end of Protocol specific defines. | |
362 | */ | |
363 | ||
ed2e63aa | 364 | static int storvsc_ringbuffer_size = (128 * 1024); |
f458aada | 365 | static u32 max_outstanding_req_per_channel; |
adfbd028 | 366 | static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); |
f458aada S |
367 | |
368 | static int storvsc_vcpus_per_sub_channel = 4; | |
af9584b8 S |
369 | |
370 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
371 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
372 | ||
f458aada | 373 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
74e26784 | 374 | MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
2217a47d LL |
375 | |
376 | static int ring_avail_percent_lowater = 10; | |
377 | module_param(ring_avail_percent_lowater, int, S_IRUGO); | |
378 | MODULE_PARM_DESC(ring_avail_percent_lowater, | |
379 | "Select a channel if available ring size > this in percent"); | |
380 | ||
893def38 S |
381 | /* |
382 | * Timeout in seconds for all devices managed by this driver. | |
383 | */ | |
384 | static int storvsc_timeout = 180; | |
385 | ||
dac58241 S |
386 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
387 | static struct scsi_transport_template *fc_transport_template; | |
388 | #endif | |
af9584b8 | 389 | |
453de21c | 390 | static struct scsi_host_template scsi_driver; |
6f94d5de S |
391 | static void storvsc_on_channel_callback(void *context); |
392 | ||
4cd83ecd S |
393 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
394 | #define STORVSC_MAX_TARGETS 2 | |
395 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 396 | |
4cd83ecd S |
397 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
398 | #define STORVSC_FC_MAX_TARGETS 128 | |
399 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 400 | |
4cd83ecd S |
401 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
402 | #define STORVSC_IDE_MAX_TARGETS 1 | |
403 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 404 | |
61eaffc9 | 405 | struct storvsc_cmd_request { |
61eaffc9 S |
406 | struct scsi_cmnd *cmd; |
407 | ||
f0d79fe9 S |
408 | struct hv_device *device; |
409 | ||
410 | /* Synchronize the request/response if needed */ | |
411 | struct completion wait_event; | |
412 | ||
be0cf6ca S |
413 | struct vmbus_channel_packet_multipage_buffer mpb; |
414 | struct vmbus_packet_mpb_array *payload; | |
415 | u32 payload_sz; | |
416 | ||
f0d79fe9 S |
417 | struct vstor_packet vstor_packet; |
418 | }; | |
419 | ||
420 | ||
f0d79fe9 S |
421 | /* A storvsc device is a device object that contains a vmbus channel */ |
422 | struct storvsc_device { | |
423 | struct hv_device *device; | |
424 | ||
425 | bool destroy; | |
426 | bool drain_notify; | |
427 | atomic_t num_outstanding_req; | |
cd654ea1 | 428 | struct Scsi_Host *host; |
f0d79fe9 S |
429 | |
430 | wait_queue_head_t waiting_to_drain; | |
431 | ||
432 | /* | |
433 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
434 | * controller. In reality, the pathid, targetid is always 0 | |
435 | * and the port is set by us | |
436 | */ | |
437 | unsigned int port_number; | |
438 | unsigned char path_id; | |
439 | unsigned char target_id; | |
440 | ||
244808e0 APM |
441 | /* |
442 | * The size of the vmscsi_request has changed in win8. The | |
443 | * additional size is because of new elements added to the | |
444 | * structure. These elements are valid only when we are talking | |
445 | * to a win8 host. | |
446 | * Track the correction to size we need to apply. This value | |
447 | * will likely change during protocol negotiation but it is | |
448 | * valid to start by assuming pre-Win8. | |
449 | */ | |
450 | int vmscsi_size_delta; | |
451 | ||
5117b936 S |
452 | /* |
453 | * Max I/O, the device can support. | |
454 | */ | |
455 | u32 max_transfer_bytes; | |
d86adf48 S |
456 | /* |
457 | * Number of sub-channels we will open. | |
458 | */ | |
459 | u16 num_sc; | |
460 | struct vmbus_channel **stor_chns; | |
461 | /* | |
462 | * Mask of CPUs bound to subchannels. | |
463 | */ | |
464 | struct cpumask alloced_cpus; | |
21d2052c APM |
465 | /* |
466 | * Serializes modifications of stor_chns[] from storvsc_do_io() | |
467 | * and storvsc_change_target_cpu(). | |
468 | */ | |
469 | spinlock_t lock; | |
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; | |
daf0cd44 CA |
478 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
479 | struct fc_rport *rport; | |
480 | #endif | |
f0d79fe9 S |
481 | }; |
482 | ||
ce3e301c S |
483 | struct hv_host_device { |
484 | struct hv_device *dev; | |
c1b3d067 S |
485 | unsigned int port; |
486 | unsigned char path; | |
487 | unsigned char target; | |
436ad941 | 488 | struct workqueue_struct *handle_error_wq; |
c58cc70f LL |
489 | struct work_struct host_scan_work; |
490 | struct Scsi_Host *host; | |
c1b3d067 S |
491 | }; |
492 | ||
12675799 S |
493 | struct storvsc_scan_work { |
494 | struct work_struct work; | |
495 | struct Scsi_Host *host; | |
98441221 S |
496 | u8 lun; |
497 | u8 tgt_id; | |
12675799 S |
498 | }; |
499 | ||
6781209e S |
500 | static void storvsc_device_scan(struct work_struct *work) |
501 | { | |
502 | struct storvsc_scan_work *wrk; | |
6781209e S |
503 | struct scsi_device *sdev; |
504 | ||
505 | wrk = container_of(work, struct storvsc_scan_work, work); | |
6781209e | 506 | |
98441221 | 507 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
6781209e S |
508 | if (!sdev) |
509 | goto done; | |
510 | scsi_rescan_device(&sdev->sdev_gendev); | |
511 | scsi_device_put(sdev); | |
512 | ||
513 | done: | |
514 | kfree(wrk); | |
515 | } | |
516 | ||
2a09ed3d | 517 | static void storvsc_host_scan(struct work_struct *work) |
12675799 | 518 | { |
2a09ed3d | 519 | struct Scsi_Host *host; |
34a716bc | 520 | struct scsi_device *sdev; |
c58cc70f LL |
521 | struct hv_host_device *host_device = |
522 | container_of(work, struct hv_host_device, host_scan_work); | |
12675799 | 523 | |
c58cc70f | 524 | host = host_device->host; |
34a716bc S |
525 | /* |
526 | * Before scanning the host, first check to see if any of the | |
527 | * currrently known devices have been hot removed. We issue a | |
528 | * "unit ready" command against all currently known devices. | |
529 | * This I/O will result in an error for devices that have been | |
530 | * removed. As part of handling the I/O error, we remove the device. | |
531 | * | |
532 | * When a LUN is added or removed, the host sends us a signal to | |
533 | * scan the host. Thus we are forced to discover the LUNs that | |
534 | * may have been removed this way. | |
535 | */ | |
536 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 537 | shost_for_each_device(sdev, host) |
34a716bc | 538 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
539 | mutex_unlock(&host->scan_mutex); |
540 | /* | |
541 | * Now scan the host to discover LUNs that may have been added. | |
542 | */ | |
2a09ed3d | 543 | scsi_scan_host(host); |
12675799 S |
544 | } |
545 | ||
b4017319 S |
546 | static void storvsc_remove_lun(struct work_struct *work) |
547 | { | |
548 | struct storvsc_scan_work *wrk; | |
549 | struct scsi_device *sdev; | |
550 | ||
551 | wrk = container_of(work, struct storvsc_scan_work, work); | |
552 | if (!scsi_host_get(wrk->host)) | |
553 | goto done; | |
554 | ||
98441221 | 555 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
b4017319 S |
556 | |
557 | if (sdev) { | |
558 | scsi_remove_device(sdev); | |
559 | scsi_device_put(sdev); | |
560 | } | |
561 | scsi_host_put(wrk->host); | |
562 | ||
563 | done: | |
564 | kfree(wrk); | |
565 | } | |
566 | ||
af9584b8 | 567 | |
a8c18c57 S |
568 | /* |
569 | * We can get incoming messages from the host that are not in response to | |
570 | * messages that we have sent out. An example of this would be messages | |
571 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
572 | * deal with potential race conditions where the driver may be in the | |
573 | * midst of being unloaded when we might receive an unsolicited message | |
574 | * from the host, we have implemented a mechanism to gurantee sequential | |
575 | * consistency: | |
576 | * | |
577 | * 1) Once the device is marked as being destroyed, we will fail all | |
578 | * outgoing messages. | |
579 | * 2) We permit incoming messages when the device is being destroyed, | |
580 | * only to properly account for messages already sent out. | |
581 | */ | |
582 | ||
f0d79fe9 S |
583 | static inline struct storvsc_device *get_out_stor_device( |
584 | struct hv_device *device) | |
585 | { | |
586 | struct storvsc_device *stor_device; | |
587 | ||
cd654ea1 | 588 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
589 | |
590 | if (stor_device && stor_device->destroy) | |
591 | stor_device = NULL; | |
592 | ||
593 | return stor_device; | |
594 | } | |
595 | ||
596 | ||
597 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
598 | { | |
599 | dev->drain_notify = true; | |
600 | wait_event(dev->waiting_to_drain, | |
601 | atomic_read(&dev->num_outstanding_req) == 0); | |
602 | dev->drain_notify = false; | |
603 | } | |
bef4a34a | 604 | |
8dcf37d4 S |
605 | static inline struct storvsc_device *get_in_stor_device( |
606 | struct hv_device *device) | |
607 | { | |
608 | struct storvsc_device *stor_device; | |
8dcf37d4 | 609 | |
cd654ea1 | 610 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
611 | |
612 | if (!stor_device) | |
613 | goto get_in_err; | |
614 | ||
615 | /* | |
616 | * If the device is being destroyed; allow incoming | |
617 | * traffic only to cleanup outstanding requests. | |
618 | */ | |
619 | ||
620 | if (stor_device->destroy && | |
621 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
622 | stor_device = NULL; | |
623 | ||
624 | get_in_err: | |
8dcf37d4 S |
625 | return stor_device; |
626 | ||
627 | } | |
628 | ||
7769e18c APM |
629 | static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, |
630 | u32 new) | |
631 | { | |
632 | struct storvsc_device *stor_device; | |
633 | struct vmbus_channel *cur_chn; | |
634 | bool old_is_alloced = false; | |
635 | struct hv_device *device; | |
636 | unsigned long flags; | |
637 | int cpu; | |
638 | ||
639 | device = channel->primary_channel ? | |
640 | channel->primary_channel->device_obj | |
641 | : channel->device_obj; | |
642 | stor_device = get_out_stor_device(device); | |
643 | if (!stor_device) | |
644 | return; | |
645 | ||
646 | /* See storvsc_do_io() -> get_og_chn(). */ | |
21d2052c | 647 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
648 | |
649 | /* | |
650 | * Determines if the storvsc device has other channels assigned to | |
651 | * the "old" CPU to update the alloced_cpus mask and the stor_chns | |
652 | * array. | |
653 | */ | |
654 | if (device->channel != channel && device->channel->target_cpu == old) { | |
655 | cur_chn = device->channel; | |
656 | old_is_alloced = true; | |
657 | goto old_is_alloced; | |
658 | } | |
659 | list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { | |
660 | if (cur_chn == channel) | |
661 | continue; | |
662 | if (cur_chn->target_cpu == old) { | |
663 | old_is_alloced = true; | |
664 | goto old_is_alloced; | |
665 | } | |
666 | } | |
667 | ||
668 | old_is_alloced: | |
669 | if (old_is_alloced) | |
670 | WRITE_ONCE(stor_device->stor_chns[old], cur_chn); | |
671 | else | |
672 | cpumask_clear_cpu(old, &stor_device->alloced_cpus); | |
673 | ||
674 | /* "Flush" the stor_chns array. */ | |
675 | for_each_possible_cpu(cpu) { | |
676 | if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( | |
677 | cpu, &stor_device->alloced_cpus)) | |
678 | WRITE_ONCE(stor_device->stor_chns[cpu], NULL); | |
679 | } | |
680 | ||
681 | WRITE_ONCE(stor_device->stor_chns[new], channel); | |
682 | cpumask_set_cpu(new, &stor_device->alloced_cpus); | |
683 | ||
21d2052c | 684 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
685 | } |
686 | ||
6f94d5de S |
687 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
688 | { | |
689 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
c9675904 | 690 | struct device *dev = &device->device; |
6f94d5de S |
691 | struct storvsc_device *stor_device; |
692 | struct vmstorage_channel_properties props; | |
c9675904 | 693 | int ret; |
6f94d5de S |
694 | |
695 | stor_device = get_out_stor_device(device); | |
696 | if (!stor_device) | |
697 | return; | |
698 | ||
6f94d5de S |
699 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
700 | ||
453de21c AB |
701 | /* |
702 | * The size of vmbus_requestor is an upper bound on the number of requests | |
703 | * that can be in-progress at any one time across all channels. | |
704 | */ | |
705 | new_sc->rqstor_size = scsi_driver.can_queue; | |
706 | ||
c9675904 DC |
707 | ret = vmbus_open(new_sc, |
708 | storvsc_ringbuffer_size, | |
709 | storvsc_ringbuffer_size, | |
710 | (void *)&props, | |
711 | sizeof(struct vmstorage_channel_properties), | |
712 | storvsc_on_channel_callback, new_sc); | |
d86adf48 | 713 | |
c9675904 DC |
714 | /* In case vmbus_open() fails, we don't use the sub-channel. */ |
715 | if (ret != 0) { | |
716 | dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); | |
717 | return; | |
d86adf48 | 718 | } |
c9675904 | 719 | |
7769e18c APM |
720 | new_sc->change_target_cpu_callback = storvsc_change_target_cpu; |
721 | ||
c9675904 DC |
722 | /* Add the sub-channel to the array of available channels. */ |
723 | stor_device->stor_chns[new_sc->target_cpu] = new_sc; | |
724 | cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); | |
6f94d5de S |
725 | } |
726 | ||
727 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
728 | { | |
c9675904 | 729 | struct device *dev = &device->device; |
6f94d5de | 730 | struct storvsc_device *stor_device; |
6f94d5de S |
731 | int num_sc; |
732 | struct storvsc_cmd_request *request; | |
733 | struct vstor_packet *vstor_packet; | |
734 | int ret, t; | |
735 | ||
382e06d1 MK |
736 | /* |
737 | * If the number of CPUs is artificially restricted, such as | |
738 | * with maxcpus=1 on the kernel boot line, Hyper-V could offer | |
739 | * sub-channels >= the number of CPUs. These sub-channels | |
740 | * should not be created. The primary channel is already created | |
741 | * and assigned to one CPU, so check against # CPUs - 1. | |
742 | */ | |
743 | num_sc = min((int)(num_online_cpus() - 1), max_chns); | |
744 | if (!num_sc) | |
745 | return; | |
746 | ||
6f94d5de S |
747 | stor_device = get_out_stor_device(device); |
748 | if (!stor_device) | |
749 | return; | |
750 | ||
d86adf48 | 751 | stor_device->num_sc = num_sc; |
6f94d5de S |
752 | request = &stor_device->init_request; |
753 | vstor_packet = &request->vstor_packet; | |
754 | ||
6f94d5de S |
755 | /* |
756 | * Establish a handler for dealing with subchannels. | |
757 | */ | |
758 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
759 | ||
6f94d5de S |
760 | /* |
761 | * Request the host to create sub-channels. | |
762 | */ | |
763 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
764 | init_completion(&request->wait_event); | |
765 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
766 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
767 | vstor_packet->sub_channel_count = num_sc; | |
768 | ||
769 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
770 | (sizeof(struct vstor_packet) - | |
244808e0 | 771 | stor_device->vmscsi_size_delta), |
6f94d5de S |
772 | (unsigned long)request, |
773 | VM_PKT_DATA_INBAND, | |
774 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
775 | ||
c9675904 DC |
776 | if (ret != 0) { |
777 | dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); | |
6f94d5de | 778 | return; |
c9675904 | 779 | } |
6f94d5de S |
780 | |
781 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
c9675904 DC |
782 | if (t == 0) { |
783 | dev_err(dev, "Failed to create sub-channel: timed out\n"); | |
6f94d5de | 784 | return; |
c9675904 | 785 | } |
6f94d5de S |
786 | |
787 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
c9675904 DC |
788 | vstor_packet->status != 0) { |
789 | dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", | |
790 | vstor_packet->operation, vstor_packet->status); | |
6f94d5de | 791 | return; |
c9675904 | 792 | } |
6f94d5de S |
793 | |
794 | /* | |
c9675904 DC |
795 | * We need to do nothing here, because vmbus_process_offer() |
796 | * invokes channel->sc_creation_callback, which will open and use | |
797 | * the sub-channel(s). | |
6f94d5de | 798 | */ |
6f94d5de S |
799 | } |
800 | ||
dac58241 S |
801 | static void cache_wwn(struct storvsc_device *stor_device, |
802 | struct vstor_packet *vstor_packet) | |
803 | { | |
804 | /* | |
805 | * Cache the currently active port and node ww names. | |
806 | */ | |
807 | if (vstor_packet->wwn_packet.primary_active) { | |
808 | stor_device->node_name = | |
809 | wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); | |
810 | stor_device->port_name = | |
811 | wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); | |
812 | } else { | |
813 | stor_device->node_name = | |
814 | wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); | |
815 | stor_device->port_name = | |
816 | wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); | |
817 | } | |
818 | } | |
819 | ||
59635018 S |
820 | |
821 | static int storvsc_execute_vstor_op(struct hv_device *device, | |
822 | struct storvsc_cmd_request *request, | |
823 | bool status_check) | |
8dcf37d4 | 824 | { |
244808e0 | 825 | struct storvsc_device *stor_device; |
8dcf37d4 | 826 | struct vstor_packet *vstor_packet; |
59635018 | 827 | int ret, t; |
8dcf37d4 | 828 | |
244808e0 APM |
829 | stor_device = get_out_stor_device(device); |
830 | if (!stor_device) | |
831 | return -ENODEV; | |
832 | ||
8dcf37d4 S |
833 | vstor_packet = &request->vstor_packet; |
834 | ||
8dcf37d4 | 835 | init_completion(&request->wait_event); |
8dcf37d4 S |
836 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
837 | ||
838 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 | 839 | (sizeof(struct vstor_packet) - |
244808e0 | 840 | stor_device->vmscsi_size_delta), |
8dcf37d4 S |
841 | (unsigned long)request, |
842 | VM_PKT_DATA_INBAND, | |
843 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
844 | if (ret != 0) | |
dac58241 | 845 | return ret; |
8dcf37d4 S |
846 | |
847 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
dac58241 S |
848 | if (t == 0) |
849 | return -ETIMEDOUT; | |
8dcf37d4 | 850 | |
59635018 S |
851 | if (!status_check) |
852 | return ret; | |
853 | ||
8dcf37d4 | 854 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
dac58241 S |
855 | vstor_packet->status != 0) |
856 | return -EINVAL; | |
8dcf37d4 | 857 | |
59635018 S |
858 | return ret; |
859 | } | |
860 | ||
861 | static int storvsc_channel_init(struct hv_device *device, bool is_fc) | |
862 | { | |
863 | struct storvsc_device *stor_device; | |
864 | struct storvsc_cmd_request *request; | |
865 | struct vstor_packet *vstor_packet; | |
866 | int ret, i; | |
867 | int max_chns; | |
868 | bool process_sub_channels = false; | |
869 | ||
870 | stor_device = get_out_stor_device(device); | |
871 | if (!stor_device) | |
872 | return -ENODEV; | |
873 | ||
874 | request = &stor_device->init_request; | |
875 | vstor_packet = &request->vstor_packet; | |
876 | ||
877 | /* | |
878 | * Now, initiate the vsc/vsp initialization protocol on the open | |
879 | * channel | |
880 | */ | |
881 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
882 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
883 | ret = storvsc_execute_vstor_op(device, request, true); | |
884 | if (ret) | |
885 | return ret; | |
886 | /* | |
887 | * Query host supported protocol version. | |
888 | */ | |
8dcf37d4 | 889 | |
1a363108 KM |
890 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
891 | /* reuse the packet for version range supported */ | |
892 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
893 | vstor_packet->operation = | |
894 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
8dcf37d4 | 895 | |
1a363108 KM |
896 | vstor_packet->version.major_minor = |
897 | vmstor_protocols[i].protocol_version; | |
85904a5e | 898 | |
1a363108 KM |
899 | /* |
900 | * The revision number is only used in Windows; set it to 0. | |
901 | */ | |
902 | vstor_packet->version.revision = 0; | |
59635018 | 903 | ret = storvsc_execute_vstor_op(device, request, false); |
1a363108 | 904 | if (ret != 0) |
dac58241 | 905 | return ret; |
8dcf37d4 | 906 | |
dac58241 S |
907 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
908 | return -EINVAL; | |
1a363108 KM |
909 | |
910 | if (vstor_packet->status == 0) { | |
911 | vmstor_proto_version = | |
912 | vmstor_protocols[i].protocol_version; | |
913 | ||
914 | sense_buffer_size = | |
915 | vmstor_protocols[i].sense_buffer_size; | |
916 | ||
244808e0 | 917 | stor_device->vmscsi_size_delta = |
1a363108 KM |
918 | vmstor_protocols[i].vmscsi_size_delta; |
919 | ||
920 | break; | |
921 | } | |
8dcf37d4 S |
922 | } |
923 | ||
dac58241 S |
924 | if (vstor_packet->status != 0) |
925 | return -EINVAL; | |
8dcf37d4 S |
926 | |
927 | ||
928 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
929 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
59635018 | 930 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 931 | if (ret != 0) |
dac58241 | 932 | return ret; |
8dcf37d4 | 933 | |
6f94d5de S |
934 | /* |
935 | * Check to see if multi-channel support is there. | |
936 | * Hosts that implement protocol version of 5.1 and above | |
937 | * support multi-channel. | |
938 | */ | |
939 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
d86adf48 S |
940 | |
941 | /* | |
942 | * Allocate state to manage the sub-channels. | |
943 | * We allocate an array based on the numbers of possible CPUs | |
944 | * (Hyper-V does not support cpu online/offline). | |
945 | * This Array will be sparseley populated with unique | |
946 | * channels - primary + sub-channels. | |
947 | * We will however populate all the slots to evenly distribute | |
948 | * the load. | |
949 | */ | |
e0408528 | 950 | stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), |
d86adf48 S |
951 | GFP_KERNEL); |
952 | if (stor_device->stor_chns == NULL) | |
953 | return -ENOMEM; | |
954 | ||
7769e18c APM |
955 | device->channel->change_target_cpu_callback = storvsc_change_target_cpu; |
956 | ||
d86adf48 S |
957 | stor_device->stor_chns[device->channel->target_cpu] = device->channel; |
958 | cpumask_set_cpu(device->channel->target_cpu, | |
959 | &stor_device->alloced_cpus); | |
960 | ||
e6c4bc66 | 961 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
6f94d5de S |
962 | if (vstor_packet->storage_channel_properties.flags & |
963 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
964 | process_sub_channels = true; | |
965 | } | |
5117b936 S |
966 | stor_device->max_transfer_bytes = |
967 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 968 | |
dac58241 S |
969 | if (!is_fc) |
970 | goto done; | |
971 | ||
59635018 S |
972 | /* |
973 | * For FC devices retrieve FC HBA data. | |
974 | */ | |
dac58241 S |
975 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
976 | vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; | |
59635018 | 977 | ret = storvsc_execute_vstor_op(device, request, true); |
dac58241 S |
978 | if (ret != 0) |
979 | return ret; | |
980 | ||
dac58241 S |
981 | /* |
982 | * Cache the currently active port and node ww names. | |
983 | */ | |
984 | cache_wwn(stor_device, vstor_packet); | |
985 | ||
986 | done: | |
987 | ||
8dcf37d4 S |
988 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
989 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
59635018 | 990 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 991 | if (ret != 0) |
dac58241 | 992 | return ret; |
8dcf37d4 | 993 | |
6f94d5de S |
994 | if (process_sub_channels) |
995 | handle_multichannel_storage(device, max_chns); | |
996 | ||
8dcf37d4 S |
997 | return ret; |
998 | } | |
999 | ||
c50bd448 S |
1000 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1001 | struct scsi_cmnd *scmnd, | |
1002 | struct Scsi_Host *host, | |
1003 | u8 asc, u8 ascq) | |
1004 | { | |
1005 | struct storvsc_scan_work *wrk; | |
1006 | void (*process_err_fn)(struct work_struct *work); | |
436ad941 | 1007 | struct hv_host_device *host_dev = shost_priv(host); |
c50bd448 S |
1008 | bool do_work = false; |
1009 | ||
3209f9d7 | 1010 | switch (SRB_STATUS(vm_srb->srb_status)) { |
c50bd448 | 1011 | case SRB_STATUS_ERROR: |
bba5dc33 LL |
1012 | /* |
1013 | * Let upper layer deal with error when | |
1014 | * sense message is present. | |
1015 | */ | |
1016 | ||
1017 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) | |
1018 | break; | |
c50bd448 S |
1019 | /* |
1020 | * If there is an error; offline the device since all | |
1021 | * error recovery strategies would have already been | |
1022 | * deployed on the host side. However, if the command | |
1023 | * were a pass-through command deal with it appropriately. | |
1024 | */ | |
1025 | switch (scmnd->cmnd[0]) { | |
1026 | case ATA_16: | |
1027 | case ATA_12: | |
1028 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1029 | break; | |
3533f860 S |
1030 | /* |
1031 | * On Some Windows hosts TEST_UNIT_READY command can return | |
1032 | * SRB_STATUS_ERROR, let the upper level code deal with it | |
1033 | * based on the sense information. | |
1034 | */ | |
1035 | case TEST_UNIT_READY: | |
1036 | break; | |
c50bd448 | 1037 | default: |
d1b8b239 | 1038 | set_host_byte(scmnd, DID_ERROR); |
c50bd448 S |
1039 | } |
1040 | break; | |
1041 | case SRB_STATUS_INVALID_LUN: | |
d1b8b239 | 1042 | set_host_byte(scmnd, DID_NO_CONNECT); |
c50bd448 S |
1043 | do_work = true; |
1044 | process_err_fn = storvsc_remove_lun; | |
1045 | break; | |
ff06c5ff VK |
1046 | case SRB_STATUS_ABORTED: |
1047 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && | |
1048 | (asc == 0x2a) && (ascq == 0x9)) { | |
6781209e S |
1049 | do_work = true; |
1050 | process_err_fn = storvsc_device_scan; | |
1051 | /* | |
fbca7a04 | 1052 | * Retry the I/O that triggered this. |
6781209e S |
1053 | */ |
1054 | set_host_byte(scmnd, DID_REQUEUE); | |
1055 | } | |
1056 | break; | |
c50bd448 | 1057 | } |
6781209e | 1058 | |
c50bd448 S |
1059 | if (!do_work) |
1060 | return; | |
1061 | ||
1062 | /* | |
1063 | * We need to schedule work to process this error; schedule it. | |
1064 | */ | |
1065 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1066 | if (!wrk) { | |
1067 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1068 | return; | |
1069 | } | |
1070 | ||
1071 | wrk->host = host; | |
1072 | wrk->lun = vm_srb->lun; | |
98441221 | 1073 | wrk->tgt_id = vm_srb->target_id; |
c50bd448 | 1074 | INIT_WORK(&wrk->work, process_err_fn); |
436ad941 | 1075 | queue_work(host_dev->handle_error_wq, &wrk->work); |
c50bd448 S |
1076 | } |
1077 | ||
2707388c | 1078 | |
03996f20 S |
1079 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
1080 | struct storvsc_device *stor_dev) | |
8dcf37d4 | 1081 | { |
2707388c | 1082 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
2707388c S |
1083 | struct scsi_sense_hdr sense_hdr; |
1084 | struct vmscsi_request *vm_srb; | |
40630f46 | 1085 | u32 data_transfer_length; |
c50bd448 | 1086 | struct Scsi_Host *host; |
be0cf6ca S |
1087 | u32 payload_sz = cmd_request->payload_sz; |
1088 | void *payload = cmd_request->payload; | |
c50bd448 | 1089 | |
c50bd448 | 1090 | host = stor_dev->host; |
8dcf37d4 | 1091 | |
61eaffc9 | 1092 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
40630f46 | 1093 | data_transfer_length = vm_srb->data_transfer_length; |
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, | |
f8aea701 | 1099 | SCSI_SENSE_BUFFERSIZE, &sense_hdr) && |
84b342c0 CA |
1100 | !(sense_hdr.sense_key == NOT_READY && |
1101 | sense_hdr.asc == 0x03A) && | |
f8aea701 | 1102 | do_logging(STORVSC_LOGGING_ERROR)) |
d811b848 HR |
1103 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1104 | &sense_hdr); | |
2707388c S |
1105 | } |
1106 | ||
40630f46 | 1107 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { |
c50bd448 S |
1108 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
1109 | sense_hdr.ascq); | |
40630f46 LL |
1110 | /* |
1111 | * The Windows driver set data_transfer_length on | |
1112 | * SRB_STATUS_DATA_OVERRUN. On other errors, this value | |
1113 | * is untouched. In these cases we set it to 0. | |
1114 | */ | |
1115 | if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) | |
1116 | data_transfer_length = 0; | |
1117 | } | |
c50bd448 | 1118 | |
0a765665 AB |
1119 | /* Validate data_transfer_length (from Hyper-V) */ |
1120 | if (data_transfer_length > cmd_request->payload->range.len) | |
1121 | data_transfer_length = cmd_request->payload->range.len; | |
1122 | ||
2707388c | 1123 | scsi_set_resid(scmnd, |
40630f46 | 1124 | cmd_request->payload->range.len - data_transfer_length); |
2707388c | 1125 | |
ead3700d | 1126 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
1127 | |
1128 | if (payload_sz > | |
1129 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1130 | kfree(payload); | |
2707388c S |
1131 | } |
1132 | ||
03996f20 | 1133 | static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
2707388c | 1134 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1135 | struct storvsc_cmd_request *request) |
2707388c | 1136 | { |
2707388c | 1137 | struct vstor_packet *stor_pkt; |
03996f20 | 1138 | struct hv_device *device = stor_device->device; |
2707388c | 1139 | |
2707388c S |
1140 | stor_pkt = &request->vstor_packet; |
1141 | ||
1142 | /* | |
1143 | * The current SCSI handling on the host side does | |
1144 | * not correctly handle: | |
1145 | * INQUIRY command with page code parameter set to 0x80 | |
1146 | * MODE_SENSE command with cmd[2] == 0x1c | |
1147 | * | |
1148 | * Setup srb and scsi status so this won't be fatal. | |
1149 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1150 | * (srb status == 0x4) and off-line the device in that case. |
1151 | */ | |
1152 | ||
1153 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1154 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1155 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1156 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1157 | } |
1158 | ||
8dcf37d4 S |
1159 | |
1160 | /* Copy over the status...etc */ | |
1161 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1162 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
0a765665 AB |
1163 | |
1164 | /* Validate sense_info_length (from Hyper-V) */ | |
1165 | if (vstor_packet->vm_srb.sense_info_length > sense_buffer_size) | |
1166 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; | |
1167 | ||
8dcf37d4 S |
1168 | stor_pkt->vm_srb.sense_info_length = |
1169 | vstor_packet->vm_srb.sense_info_length; | |
1170 | ||
f8aea701 LL |
1171 | if (vstor_packet->vm_srb.scsi_status != 0 || |
1172 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) | |
1173 | storvsc_log(device, STORVSC_LOGGING_WARN, | |
1174 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
1175 | stor_pkt->vm_srb.cdb[0], | |
1176 | vstor_packet->vm_srb.scsi_status, | |
1177 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
1178 | |
1179 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
1180 | /* CHECK_CONDITION */ | |
16046320 S |
1181 | if (vstor_packet->vm_srb.srb_status & |
1182 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 1183 | /* autosense data available */ |
8dcf37d4 | 1184 | |
f8aea701 LL |
1185 | storvsc_log(device, STORVSC_LOGGING_WARN, |
1186 | "stor pkt %p autosense data valid - len %d\n", | |
1187 | request, vstor_packet->vm_srb.sense_info_length); | |
1188 | ||
ead3700d | 1189 | memcpy(request->cmd->sense_buffer, |
8dcf37d4 S |
1190 | vstor_packet->vm_srb.sense_data, |
1191 | vstor_packet->vm_srb.sense_info_length); | |
1192 | ||
1193 | } | |
1194 | } | |
1195 | ||
1196 | stor_pkt->vm_srb.data_transfer_length = | |
1197 | vstor_packet->vm_srb.data_transfer_length; | |
1198 | ||
03996f20 | 1199 | storvsc_command_completion(request, stor_device); |
8dcf37d4 S |
1200 | |
1201 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1202 | stor_device->drain_notify) | |
1203 | wake_up(&stor_device->waiting_to_drain); | |
1204 | ||
1205 | ||
1206 | } | |
1207 | ||
03996f20 | 1208 | static void storvsc_on_receive(struct storvsc_device *stor_device, |
8dcf37d4 | 1209 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1210 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1211 | { |
c58cc70f | 1212 | struct hv_host_device *host_dev; |
8dcf37d4 S |
1213 | switch (vstor_packet->operation) { |
1214 | case VSTOR_OPERATION_COMPLETE_IO: | |
03996f20 | 1215 | storvsc_on_io_completion(stor_device, vstor_packet, request); |
8dcf37d4 | 1216 | break; |
12675799 | 1217 | |
8dcf37d4 | 1218 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 | 1219 | case VSTOR_OPERATION_ENUMERATE_BUS: |
c58cc70f LL |
1220 | host_dev = shost_priv(stor_device->host); |
1221 | queue_work( | |
1222 | host_dev->handle_error_wq, &host_dev->host_scan_work); | |
12675799 | 1223 | break; |
8dcf37d4 | 1224 | |
dac58241 | 1225 | case VSTOR_OPERATION_FCHBA_DATA: |
dac58241 S |
1226 | cache_wwn(stor_device, vstor_packet); |
1227 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1228 | fc_host_node_name(stor_device->host) = stor_device->node_name; | |
1229 | fc_host_port_name(stor_device->host) = stor_device->port_name; | |
1230 | #endif | |
1231 | break; | |
8dcf37d4 S |
1232 | default: |
1233 | break; | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | static void storvsc_on_channel_callback(void *context) | |
1238 | { | |
6f94d5de | 1239 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
ddccd952 | 1240 | const struct vmpacket_descriptor *desc; |
6f94d5de | 1241 | struct hv_device *device; |
8dcf37d4 | 1242 | struct storvsc_device *stor_device; |
8dcf37d4 | 1243 | |
6f94d5de S |
1244 | if (channel->primary_channel != NULL) |
1245 | device = channel->primary_channel->device_obj; | |
1246 | else | |
1247 | device = channel->device_obj; | |
8dcf37d4 S |
1248 | |
1249 | stor_device = get_in_stor_device(device); | |
1250 | if (!stor_device) | |
1251 | return; | |
1252 | ||
ddccd952 SH |
1253 | foreach_vmbus_pkt(desc, channel) { |
1254 | void *packet = hv_pkt_data(desc); | |
1255 | struct storvsc_cmd_request *request; | |
453de21c AB |
1256 | u64 cmd_rqst; |
1257 | ||
1258 | cmd_rqst = vmbus_request_addr(&channel->requestor, | |
1259 | desc->trans_id); | |
1260 | if (cmd_rqst == VMBUS_RQST_ERROR) { | |
1261 | dev_err(&device->device, | |
1262 | "Incorrect transaction id\n"); | |
1263 | continue; | |
1264 | } | |
ddccd952 | 1265 | |
453de21c | 1266 | request = (struct storvsc_cmd_request *)(unsigned long)cmd_rqst; |
ddccd952 SH |
1267 | |
1268 | if (request == &stor_device->init_request || | |
1269 | request == &stor_device->reset_request) { | |
1270 | memcpy(&request->vstor_packet, packet, | |
244808e0 | 1271 | (sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta)); |
ddccd952 | 1272 | complete(&request->wait_event); |
8dcf37d4 | 1273 | } else { |
ddccd952 | 1274 | storvsc_on_receive(stor_device, packet, request); |
8dcf37d4 | 1275 | } |
ddccd952 | 1276 | } |
8dcf37d4 S |
1277 | } |
1278 | ||
dac58241 S |
1279 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
1280 | bool is_fc) | |
8dcf37d4 S |
1281 | { |
1282 | struct vmstorage_channel_properties props; | |
1283 | int ret; | |
1284 | ||
1285 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1286 | ||
453de21c AB |
1287 | /* |
1288 | * The size of vmbus_requestor is an upper bound on the number of requests | |
1289 | * that can be in-progress at any one time across all channels. | |
1290 | */ | |
1291 | device->channel->rqstor_size = scsi_driver.can_queue; | |
1292 | ||
8dcf37d4 S |
1293 | ret = vmbus_open(device->channel, |
1294 | ring_size, | |
1295 | ring_size, | |
1296 | (void *)&props, | |
1297 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1298 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1299 | |
1300 | if (ret != 0) | |
1301 | return ret; | |
1302 | ||
dac58241 | 1303 | ret = storvsc_channel_init(device, is_fc); |
8dcf37d4 S |
1304 | |
1305 | return ret; | |
1306 | } | |
1307 | ||
c1b3d067 | 1308 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1309 | { |
1310 | struct storvsc_device *stor_device; | |
8dcf37d4 | 1311 | |
cd654ea1 | 1312 | stor_device = hv_get_drvdata(device); |
8dcf37d4 | 1313 | |
8dcf37d4 | 1314 | stor_device->destroy = true; |
2371cd90 SH |
1315 | |
1316 | /* Make sure flag is set before waiting */ | |
1317 | wmb(); | |
8dcf37d4 S |
1318 | |
1319 | /* | |
1320 | * At this point, all outbound traffic should be disable. We | |
1321 | * only allow inbound traffic (responses) to proceed so that | |
1322 | * outstanding requests can be completed. | |
1323 | */ | |
1324 | ||
1325 | storvsc_wait_to_drain(stor_device); | |
1326 | ||
1327 | /* | |
1328 | * Since we have already drained, we don't need to busy wait | |
1329 | * as was done in final_release_stor_device() | |
1330 | * Note that we cannot set the ext pointer to NULL until | |
1331 | * we have drained - to drain the outgoing packets, we need to | |
1332 | * allow incoming packets. | |
1333 | */ | |
cd654ea1 | 1334 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1335 | |
1336 | /* Close the channel */ | |
1337 | vmbus_close(device->channel); | |
1338 | ||
d86adf48 | 1339 | kfree(stor_device->stor_chns); |
8dcf37d4 S |
1340 | kfree(stor_device); |
1341 | return 0; | |
1342 | } | |
1343 | ||
d86adf48 S |
1344 | static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
1345 | u16 q_num) | |
1346 | { | |
1347 | u16 slot = 0; | |
1348 | u16 hash_qnum; | |
1b25a8c4 | 1349 | const struct cpumask *node_mask; |
d86adf48 S |
1350 | int num_channels, tgt_cpu; |
1351 | ||
7769e18c APM |
1352 | if (stor_device->num_sc == 0) { |
1353 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1354 | return stor_device->device->channel; |
7769e18c | 1355 | } |
d86adf48 S |
1356 | |
1357 | /* | |
1358 | * Our channel array is sparsley populated and we | |
1359 | * initiated I/O on a processor/hw-q that does not | |
1360 | * currently have a designated channel. Fix this. | |
1361 | * The strategy is simple: | |
1362 | * I. Ensure NUMA locality | |
1363 | * II. Distribute evenly (best effort) | |
d86adf48 S |
1364 | */ |
1365 | ||
1b25a8c4 | 1366 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
d86adf48 | 1367 | |
1b25a8c4 MK |
1368 | num_channels = 0; |
1369 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { | |
1370 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1371 | num_channels++; | |
1372 | } | |
7769e18c APM |
1373 | if (num_channels == 0) { |
1374 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1375 | return stor_device->device->channel; |
7769e18c | 1376 | } |
d86adf48 S |
1377 | |
1378 | hash_qnum = q_num; | |
1379 | while (hash_qnum >= num_channels) | |
1380 | hash_qnum -= num_channels; | |
1381 | ||
1b25a8c4 MK |
1382 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1383 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1384 | continue; | |
d86adf48 S |
1385 | if (slot == hash_qnum) |
1386 | break; | |
1387 | slot++; | |
1388 | } | |
1389 | ||
1390 | stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; | |
1391 | ||
1392 | return stor_device->stor_chns[q_num]; | |
1393 | } | |
1394 | ||
1395 | ||
c1b3d067 | 1396 | static int storvsc_do_io(struct hv_device *device, |
d86adf48 | 1397 | struct storvsc_cmd_request *request, u16 q_num) |
8dcf37d4 S |
1398 | { |
1399 | struct storvsc_device *stor_device; | |
1400 | struct vstor_packet *vstor_packet; | |
2217a47d | 1401 | struct vmbus_channel *outgoing_channel, *channel; |
7769e18c | 1402 | unsigned long flags; |
8dcf37d4 | 1403 | int ret = 0; |
1b25a8c4 | 1404 | const struct cpumask *node_mask; |
d86adf48 | 1405 | int tgt_cpu; |
8dcf37d4 S |
1406 | |
1407 | vstor_packet = &request->vstor_packet; | |
1408 | stor_device = get_out_stor_device(device); | |
1409 | ||
1410 | if (!stor_device) | |
1411 | return -ENODEV; | |
1412 | ||
1413 | ||
1414 | request->device = device; | |
6f94d5de | 1415 | /* |
7769e18c | 1416 | * Select an appropriate channel to send the request out. |
6f94d5de | 1417 | */ |
7769e18c APM |
1418 | /* See storvsc_change_target_cpu(). */ |
1419 | outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); | |
1420 | if (outgoing_channel != NULL) { | |
2217a47d | 1421 | if (outgoing_channel->target_cpu == q_num) { |
d86adf48 S |
1422 | /* |
1423 | * Ideally, we want to pick a different channel if | |
1424 | * available on the same NUMA node. | |
1425 | */ | |
1b25a8c4 MK |
1426 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
1427 | for_each_cpu_wrap(tgt_cpu, | |
1428 | &stor_device->alloced_cpus, q_num + 1) { | |
1429 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1430 | continue; | |
2217a47d LL |
1431 | if (tgt_cpu == q_num) |
1432 | continue; | |
7769e18c APM |
1433 | channel = READ_ONCE( |
1434 | stor_device->stor_chns[tgt_cpu]); | |
1435 | if (channel == NULL) | |
1436 | continue; | |
2217a47d LL |
1437 | if (hv_get_avail_to_write_percent( |
1438 | &channel->outbound) | |
1439 | > ring_avail_percent_lowater) { | |
1440 | outgoing_channel = channel; | |
1441 | goto found_channel; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | /* | |
1446 | * All the other channels on the same NUMA node are | |
1447 | * busy. Try to use the channel on the current CPU | |
1448 | */ | |
1449 | if (hv_get_avail_to_write_percent( | |
1450 | &outgoing_channel->outbound) | |
1451 | > ring_avail_percent_lowater) | |
1452 | goto found_channel; | |
1453 | ||
1454 | /* | |
1455 | * If we reach here, all the channels on the current | |
1456 | * NUMA node are busy. Try to find a channel in | |
1457 | * other NUMA nodes | |
1458 | */ | |
1b25a8c4 MK |
1459 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1460 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1461 | continue; | |
7769e18c APM |
1462 | channel = READ_ONCE( |
1463 | stor_device->stor_chns[tgt_cpu]); | |
1464 | if (channel == NULL) | |
1465 | continue; | |
2217a47d LL |
1466 | if (hv_get_avail_to_write_percent( |
1467 | &channel->outbound) | |
1468 | > ring_avail_percent_lowater) { | |
1469 | outgoing_channel = channel; | |
1470 | goto found_channel; | |
d86adf48 S |
1471 | } |
1472 | } | |
1473 | } | |
1474 | } else { | |
21d2052c | 1475 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
1476 | outgoing_channel = stor_device->stor_chns[q_num]; |
1477 | if (outgoing_channel != NULL) { | |
21d2052c | 1478 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
1479 | goto found_channel; |
1480 | } | |
d86adf48 | 1481 | outgoing_channel = get_og_chn(stor_device, q_num); |
21d2052c | 1482 | spin_unlock_irqrestore(&stor_device->lock, flags); |
d86adf48 | 1483 | } |
8dcf37d4 | 1484 | |
2217a47d | 1485 | found_channel: |
8dcf37d4 S |
1486 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
1487 | ||
8b612fa2 | 1488 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
244808e0 | 1489 | stor_device->vmscsi_size_delta); |
8dcf37d4 S |
1490 | |
1491 | ||
8b612fa2 | 1492 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1493 | |
1494 | ||
1495 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1496 | request->payload->range.len; |
8dcf37d4 S |
1497 | |
1498 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1499 | ||
be0cf6ca S |
1500 | if (request->payload->range.len) { |
1501 | ||
1502 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1503 | request->payload, request->payload_sz, | |
8dcf37d4 | 1504 | vstor_packet, |
8b612fa2 | 1505 | (sizeof(struct vstor_packet) - |
244808e0 | 1506 | stor_device->vmscsi_size_delta), |
8dcf37d4 S |
1507 | (unsigned long)request); |
1508 | } else { | |
0147dabc | 1509 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 | 1510 | (sizeof(struct vstor_packet) - |
244808e0 | 1511 | stor_device->vmscsi_size_delta), |
8dcf37d4 S |
1512 | (unsigned long)request, |
1513 | VM_PKT_DATA_INBAND, | |
1514 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1515 | } | |
1516 | ||
1517 | if (ret != 0) | |
1518 | return ret; | |
1519 | ||
1520 | atomic_inc(&stor_device->num_outstanding_req); | |
1521 | ||
1522 | return ret; | |
1523 | } | |
1524 | ||
f1c635b4 SH |
1525 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1526 | { | |
1527 | /* | |
1528 | * Set blist flag to permit the reading of the VPD pages even when | |
1529 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1530 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1531 | * With this flag we can correctly handle WRITE_SAME_16 issues. | |
1532 | * | |
1533 | * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but | |
1534 | * still supports REPORT LUN. | |
1535 | */ | |
1536 | sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
419f2d03 S |
1541 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1542 | { | |
893def38 S |
1543 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1544 | ||
3e8f4f40 OH |
1545 | sdevice->no_write_same = 1; |
1546 | ||
b0a93d96 S |
1547 | /* |
1548 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1549 | * if the device is a MSFT virtual device. If the host is |
1550 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1551 | */ |
1552 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1553 | switch (vmstor_proto_version) { |
1554 | case VMSTOR_PROTO_VERSION_WIN8: | |
1555 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1556 | sdevice->scsi_level = SCSI_SPC_3; |
1557 | break; | |
1558 | } | |
b95f5be0 KM |
1559 | |
1560 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1561 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1562 | } |
1563 | ||
419f2d03 S |
1564 | return 0; |
1565 | } | |
1566 | ||
62838ce2 S |
1567 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1568 | sector_t capacity, int *info) | |
1569 | { | |
5326fd5c S |
1570 | sector_t nsect = capacity; |
1571 | sector_t cylinders = nsect; | |
1572 | int heads, sectors_pt; | |
62838ce2 | 1573 | |
5326fd5c S |
1574 | /* |
1575 | * We are making up these values; let us keep it simple. | |
1576 | */ | |
1577 | heads = 0xff; | |
1578 | sectors_pt = 0x3f; /* Sectors per track */ | |
1579 | sector_div(cylinders, heads * sectors_pt); | |
1580 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1581 | cylinders = 0xffff; | |
62838ce2 S |
1582 | |
1583 | info[0] = heads; | |
5326fd5c S |
1584 | info[1] = sectors_pt; |
1585 | info[2] = (int)cylinders; | |
62838ce2 | 1586 | |
62838ce2 S |
1587 | return 0; |
1588 | } | |
aa3d789e | 1589 | |
4b270c8b | 1590 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1591 | { |
4b270c8b S |
1592 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1593 | struct hv_device *device = host_dev->dev; | |
1594 | ||
aa3d789e | 1595 | struct storvsc_device *stor_device; |
61eaffc9 | 1596 | struct storvsc_cmd_request *request; |
aa3d789e S |
1597 | struct vstor_packet *vstor_packet; |
1598 | int ret, t; | |
1599 | ||
1eaaddf9 | 1600 | stor_device = get_out_stor_device(device); |
aa3d789e | 1601 | if (!stor_device) |
a00e8224 | 1602 | return FAILED; |
aa3d789e S |
1603 | |
1604 | request = &stor_device->reset_request; | |
1605 | vstor_packet = &request->vstor_packet; | |
0a765665 | 1606 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
aa3d789e S |
1607 | |
1608 | init_completion(&request->wait_event); | |
1609 | ||
1610 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1611 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1612 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1613 | ||
1614 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 | 1615 | (sizeof(struct vstor_packet) - |
244808e0 | 1616 | stor_device->vmscsi_size_delta), |
aa3d789e S |
1617 | (unsigned long)&stor_device->reset_request, |
1618 | VM_PKT_DATA_INBAND, | |
1619 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1620 | if (ret != 0) | |
a00e8224 | 1621 | return FAILED; |
aa3d789e | 1622 | |
46d2eb6d | 1623 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1624 | if (t == 0) |
1625 | return TIMEOUT_ERROR; | |
aa3d789e | 1626 | |
aa3d789e S |
1627 | |
1628 | /* | |
1629 | * At this point, all outstanding requests in the adapter | |
1630 | * should have been flushed out and return to us | |
5c1b10ab S |
1631 | * There is a potential race here where the host may be in |
1632 | * the process of responding when we return from here. | |
1633 | * Just wait for all in-transit packets to be accounted for | |
1634 | * before we return from here. | |
aa3d789e | 1635 | */ |
5c1b10ab | 1636 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1637 | |
a00e8224 | 1638 | return SUCCESS; |
aa3d789e S |
1639 | } |
1640 | ||
56b26e69 S |
1641 | /* |
1642 | * The host guarantees to respond to each command, although I/O latencies might | |
1643 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1644 | * chance to perform EH. | |
1645 | */ | |
1646 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1647 | { | |
3930d730 LL |
1648 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1649 | if (scmnd->device->host->transportt == fc_transport_template) | |
1650 | return fc_eh_timed_out(scmnd); | |
1651 | #endif | |
56b26e69 S |
1652 | return BLK_EH_RESET_TIMER; |
1653 | } | |
1654 | ||
c77b63b6 | 1655 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1656 | { |
1657 | bool allowed = true; | |
1658 | u8 scsi_op = scmnd->cmnd[0]; | |
1659 | ||
1660 | switch (scsi_op) { | |
3e8f4f40 OH |
1661 | /* the host does not handle WRITE_SAME, log accident usage */ |
1662 | case WRITE_SAME: | |
c77b63b6 S |
1663 | /* |
1664 | * smartd sends this command and the host does not handle | |
1665 | * this. So, don't send it. | |
1666 | */ | |
41098f8f | 1667 | case SET_WINDOW: |
59e00e74 | 1668 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1669 | allowed = false; |
1670 | break; | |
1671 | default: | |
1672 | break; | |
92ae4ebd OH |
1673 | } |
1674 | return allowed; | |
1675 | } | |
c5b463ae | 1676 | |
bab445e1 | 1677 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1678 | { |
1679 | int ret; | |
bab445e1 | 1680 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1681 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1682 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1683 | int i; |
1684 | struct scatterlist *sgl; | |
1685 | unsigned int sg_count = 0; | |
1686 | struct vmscsi_request *vm_srb; | |
aaced993 | 1687 | struct scatterlist *cur_sgl; |
be0cf6ca S |
1688 | struct vmbus_packet_mpb_array *payload; |
1689 | u32 payload_sz; | |
1690 | u32 length; | |
c5b463ae | 1691 | |
2492fd7a | 1692 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1693 | /* |
1694 | * On legacy hosts filter unimplemented commands. | |
1695 | * Future hosts are expected to correctly handle | |
1696 | * unsupported commands. Furthermore, it is | |
1697 | * possible that some of the currently | |
1698 | * unsupported commands maybe supported in | |
1699 | * future versions of the host. | |
1700 | */ | |
1701 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1702 | scmnd->scsi_done(scmnd); | |
1703 | return 0; | |
1704 | } | |
92ae4ebd | 1705 | } |
c5b463ae | 1706 | |
c5b463ae | 1707 | /* Setup the cmd request */ |
c5b463ae S |
1708 | cmd_request->cmd = scmnd; |
1709 | ||
0a765665 | 1710 | memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); |
61eaffc9 | 1711 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1712 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1713 | |
f885fb73 | 1714 | vm_srb->win8_extension.srb_flags |= |
8cf308e1 | 1715 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae | 1716 | |
3cd6d3d9 LL |
1717 | if (scmnd->device->tagged_supported) { |
1718 | vm_srb->win8_extension.srb_flags |= | |
1719 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); | |
1720 | vm_srb->win8_extension.queue_tag = SP_UNTAGGED; | |
1721 | vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; | |
1722 | } | |
1723 | ||
c5b463ae S |
1724 | /* Build the SRB */ |
1725 | switch (scmnd->sc_data_direction) { | |
1726 | case DMA_TO_DEVICE: | |
1727 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1728 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1729 | break; |
1730 | case DMA_FROM_DEVICE: | |
1731 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1732 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1733 | break; |
cb1cf080 | 1734 | case DMA_NONE: |
c5b463ae | 1735 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1736 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1737 | break; |
cb1cf080 VK |
1738 | default: |
1739 | /* | |
1740 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1741 | * supposed to see here. | |
1742 | */ | |
1743 | WARN(1, "Unexpected data direction: %d\n", | |
1744 | scmnd->sc_data_direction); | |
1745 | return -EINVAL; | |
c5b463ae S |
1746 | } |
1747 | ||
c5b463ae | 1748 | |
c5b463ae S |
1749 | vm_srb->port_number = host_dev->port; |
1750 | vm_srb->path_id = scmnd->device->channel; | |
1751 | vm_srb->target_id = scmnd->device->id; | |
1752 | vm_srb->lun = scmnd->device->lun; | |
1753 | ||
c5b463ae S |
1754 | vm_srb->cdb_length = scmnd->cmd_len; |
1755 | ||
1756 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1757 | ||
be0cf6ca S |
1758 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1759 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1760 | |
be0cf6ca S |
1761 | length = scsi_bufflen(scmnd); |
1762 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1763 | payload_sz = sizeof(cmd_request->mpb); | |
1764 | ||
1765 | if (sg_count) { | |
8f437105 BF |
1766 | unsigned int hvpgoff = 0; |
1767 | unsigned long offset_in_hvpg = sgl->offset & ~HV_HYP_PAGE_MASK; | |
1768 | unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); | |
1769 | u64 hvpfn; | |
be0cf6ca | 1770 | |
8f437105 BF |
1771 | if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { |
1772 | ||
1773 | payload_sz = (hvpg_count * sizeof(u64) + | |
be0cf6ca | 1774 | sizeof(struct vmbus_packet_mpb_array)); |
b0120d99 | 1775 | payload = kzalloc(payload_sz, GFP_ATOMIC); |
81988a0e VK |
1776 | if (!payload) |
1777 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1778 | } |
1779 | ||
8f437105 BF |
1780 | /* |
1781 | * sgl is a list of PAGEs, and payload->range.pfn_array | |
1782 | * expects the page number in the unit of HV_HYP_PAGE_SIZE (the | |
1783 | * page size that Hyper-V uses, so here we need to divide PAGEs | |
1784 | * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE. | |
1785 | * Besides, payload->range.offset should be the offset in one | |
1786 | * HV_HYP_PAGE. | |
1787 | */ | |
be0cf6ca | 1788 | payload->range.len = length; |
8f437105 BF |
1789 | payload->range.offset = offset_in_hvpg; |
1790 | hvpgoff = sgl->offset >> HV_HYP_PAGE_SHIFT; | |
be0cf6ca | 1791 | |
aaced993 | 1792 | cur_sgl = sgl; |
8f437105 BF |
1793 | for (i = 0; i < hvpg_count; i++) { |
1794 | /* | |
1795 | * 'i' is the index of hv pages in the payload and | |
1796 | * 'hvpgoff' is the offset (in hv pages) of the first | |
1797 | * hv page in the the first page. The relationship | |
1798 | * between the sum of 'i' and 'hvpgoff' and the offset | |
1799 | * (in hv pages) in a payload page ('hvpgoff_in_page') | |
1800 | * is as follow: | |
1801 | * | |
1802 | * |------------------ PAGE -------------------| | |
1803 | * | NR_HV_HYP_PAGES_IN_PAGE hvpgs in total | | |
1804 | * |hvpg|hvpg| ... |hvpg|... |hvpg| | |
1805 | * ^ ^ ^ ^ | |
1806 | * +-hvpgoff-+ +-hvpgoff_in_page-+ | |
1807 | * ^ | | |
1808 | * +--------------------- i ---------------------------+ | |
1809 | */ | |
1810 | unsigned int hvpgoff_in_page = | |
1811 | (i + hvpgoff) % NR_HV_HYP_PAGES_IN_PAGE; | |
1812 | ||
1813 | /* | |
1814 | * Two cases that we need to fetch a page: | |
1815 | * 1) i == 0, the first step or | |
1816 | * 2) hvpgoff_in_page == 0, when we reach the boundary | |
1817 | * of a page. | |
1818 | */ | |
1819 | if (hvpgoff_in_page == 0 || i == 0) { | |
1820 | hvpfn = page_to_hvpfn(sg_page(cur_sgl)); | |
1821 | cur_sgl = sg_next(cur_sgl); | |
1822 | } | |
1823 | ||
1824 | payload->range.pfn_array[i] = hvpfn + hvpgoff_in_page; | |
aaced993 | 1825 | } |
c5b463ae S |
1826 | } |
1827 | ||
be0cf6ca S |
1828 | cmd_request->payload = payload; |
1829 | cmd_request->payload_sz = payload_sz; | |
1830 | ||
c5b463ae | 1831 | /* Invokes the vsc to start an IO */ |
d86adf48 S |
1832 | ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
1833 | put_cpu(); | |
636f0fd1 | 1834 | |
d2598f01 | 1835 | if (ret == -EAGAIN) { |
0208eeaa LL |
1836 | if (payload_sz > sizeof(cmd_request->mpb)) |
1837 | kfree(payload); | |
c5b463ae | 1838 | /* no more space */ |
ead3700d | 1839 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1840 | } |
1841 | ||
c77b63b6 | 1842 | return 0; |
c5b463ae S |
1843 | } |
1844 | ||
bef4a34a | 1845 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1846 | .module = THIS_MODULE, |
1847 | .name = "storvsc_host_t", | |
ead3700d | 1848 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1849 | .bios_param = storvsc_get_chs, |
1850 | .queuecommand = storvsc_queuecommand, | |
1851 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1852 | .proc_name = "storvsc_host", |
56b26e69 | 1853 | .eh_timed_out = storvsc_eh_timed_out, |
f1c635b4 | 1854 | .slave_alloc = storvsc_device_alloc, |
ff568d3a | 1855 | .slave_configure = storvsc_device_configure, |
cabe92a5 | 1856 | .cmd_per_lun = 2048, |
ff568d3a | 1857 | .this_id = -1, |
454f18a9 | 1858 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1859 | .dma_boundary = PAGE_SIZE-1, |
83eed459 CH |
1860 | /* Ensure there are no gaps in presented sgls */ |
1861 | .virt_boundary_mask = PAGE_SIZE-1, | |
54b2b50c | 1862 | .no_write_same = 1, |
f64dad26 | 1863 | .track_queue_depth = 1, |
adfbd028 | 1864 | .change_queue_depth = storvsc_change_queue_depth, |
bef4a34a HJ |
1865 | }; |
1866 | ||
ef52a81b S |
1867 | enum { |
1868 | SCSI_GUID, | |
1869 | IDE_GUID, | |
bde6d0f9 | 1870 | SFC_GUID, |
ef52a81b S |
1871 | }; |
1872 | ||
d847b5fe | 1873 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1874 | /* SCSI guid */ |
35c3bc20 S |
1875 | { HV_SCSI_GUID, |
1876 | .driver_data = SCSI_GUID | |
1877 | }, | |
21e37742 | 1878 | /* IDE guid */ |
35c3bc20 S |
1879 | { HV_IDE_GUID, |
1880 | .driver_data = IDE_GUID | |
1881 | }, | |
bde6d0f9 S |
1882 | /* Fibre Channel GUID */ |
1883 | { | |
1884 | HV_SYNTHFC_GUID, | |
1885 | .driver_data = SFC_GUID | |
1886 | }, | |
c45cf2d4 | 1887 | { }, |
d847b5fe | 1888 | }; |
bef4a34a | 1889 | |
d847b5fe | 1890 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1891 | |
56fb1058 DC |
1892 | static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; |
1893 | ||
1894 | static bool hv_dev_is_fc(struct hv_device *hv_dev) | |
1895 | { | |
1896 | return guid_equal(&fc_guid.guid, &hv_dev->dev_type); | |
1897 | } | |
1898 | ||
84946899 S |
1899 | static int storvsc_probe(struct hv_device *device, |
1900 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1901 | { |
ff568d3a | 1902 | int ret; |
f458aada | 1903 | int num_cpus = num_online_cpus(); |
bef4a34a | 1904 | struct Scsi_Host *host; |
795b613d | 1905 | struct hv_host_device *host_dev; |
ef52a81b | 1906 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
dac58241 | 1907 | bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
bd1f5d6a | 1908 | int target = 0; |
6e4198ce | 1909 | struct storvsc_device *stor_device; |
0fb8db29 S |
1910 | int max_luns_per_target; |
1911 | int max_targets; | |
1912 | int max_channels; | |
f458aada | 1913 | int max_sub_channels = 0; |
bd1f5d6a | 1914 | |
8b612fa2 S |
1915 | /* |
1916 | * Based on the windows host we are running on, | |
1917 | * set state to properly communicate with the host. | |
1918 | */ | |
1919 | ||
6ee5c615 | 1920 | if (vmbus_proto_version < VERSION_WIN8) { |
0fb8db29 S |
1921 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1922 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1923 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1924 | } else { |
0fb8db29 S |
1925 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1926 | max_targets = STORVSC_MAX_TARGETS; | |
1927 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada | 1928 | /* |
f286299c LL |
1929 | * On Windows8 and above, we support sub-channels for storage |
1930 | * on SCSI and FC controllers. | |
f458aada S |
1931 | * The number of sub-channels offerred is based on the number of |
1932 | * VCPUs in the guest. | |
1933 | */ | |
f286299c LL |
1934 | if (!dev_is_ide) |
1935 | max_sub_channels = | |
1936 | (num_cpus - 1) / storvsc_vcpus_per_sub_channel; | |
8b612fa2 S |
1937 | } |
1938 | ||
2217a47d LL |
1939 | scsi_driver.can_queue = max_outstanding_req_per_channel * |
1940 | (max_sub_channels + 1) * | |
1941 | (100 - ring_avail_percent_lowater) / 100; | |
f458aada | 1942 | |
ff568d3a | 1943 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1944 | sizeof(struct hv_host_device)); |
f8feed06 | 1945 | if (!host) |
bef4a34a | 1946 | return -ENOMEM; |
bef4a34a | 1947 | |
7f33f30a | 1948 | host_dev = shost_priv(host); |
795b613d | 1949 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1950 | |
795b613d | 1951 | host_dev->port = host->host_no; |
97c15296 | 1952 | host_dev->dev = device; |
c58cc70f | 1953 | host_dev->host = host; |
bef4a34a | 1954 | |
4e03e697 | 1955 | |
a13d35ab | 1956 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1957 | if (!stor_device) { |
225ce6ea | 1958 | ret = -ENOMEM; |
ce3e301c | 1959 | goto err_out0; |
6e4198ce | 1960 | } |
9efd21e1 | 1961 | |
a13d35ab S |
1962 | stor_device->destroy = false; |
1963 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1964 | stor_device->device = device; | |
cd654ea1 | 1965 | stor_device->host = host; |
244808e0 | 1966 | stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); |
21d2052c | 1967 | spin_lock_init(&stor_device->lock); |
cd654ea1 | 1968 | hv_set_drvdata(device, stor_device); |
a13d35ab | 1969 | |
6e4198ce | 1970 | stor_device->port_number = host->host_no; |
dac58241 | 1971 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
225ce6ea | 1972 | if (ret) |
ce3e301c | 1973 | goto err_out1; |
bef4a34a | 1974 | |
6e4198ce S |
1975 | host_dev->path = stor_device->path_id; |
1976 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1977 | |
4cd83ecd S |
1978 | switch (dev_id->driver_data) { |
1979 | case SFC_GUID: | |
1980 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1981 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1982 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
dac58241 S |
1983 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1984 | host->transportt = fc_transport_template; | |
1985 | #endif | |
4cd83ecd S |
1986 | break; |
1987 | ||
1988 | case SCSI_GUID: | |
0fb8db29 S |
1989 | host->max_lun = max_luns_per_target; |
1990 | host->max_id = max_targets; | |
1991 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
1992 | break; |
1993 | ||
1994 | default: | |
1995 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1996 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1997 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1998 | break; | |
1999 | } | |
cf55f4a8 MS |
2000 | /* max cmd length */ |
2001 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 2002 | |
be0cf6ca S |
2003 | /* |
2004 | * set the table size based on the info we got | |
2005 | * from the host. | |
2006 | */ | |
2007 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
d86adf48 | 2008 | /* |
7b571c19 | 2009 | * For non-IDE disks, the host supports multiple channels. |
d86adf48 S |
2010 | * Set the number of HW queues we are supporting. |
2011 | */ | |
7b571c19 LL |
2012 | if (!dev_is_ide) |
2013 | host->nr_hw_queues = num_present_cpus(); | |
be0cf6ca | 2014 | |
436ad941 CA |
2015 | /* |
2016 | * Set the error handler work queue. | |
2017 | */ | |
2018 | host_dev->handle_error_wq = | |
2019 | alloc_ordered_workqueue("storvsc_error_wq_%d", | |
2020 | WQ_MEM_RECLAIM, | |
2021 | host->host_no); | |
6112ff4e JX |
2022 | if (!host_dev->handle_error_wq) { |
2023 | ret = -ENOMEM; | |
436ad941 | 2024 | goto err_out2; |
6112ff4e | 2025 | } |
c58cc70f | 2026 | INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); |
454f18a9 | 2027 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 2028 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 2029 | if (ret != 0) |
436ad941 | 2030 | goto err_out3; |
bef4a34a | 2031 | |
bd1f5d6a S |
2032 | if (!dev_is_ide) { |
2033 | scsi_scan_host(host); | |
59d22950 S |
2034 | } else { |
2035 | target = (device->dev_instance.b[5] << 8 | | |
2036 | device->dev_instance.b[4]); | |
2037 | ret = scsi_add_device(host, 0, target, 0); | |
daf0cd44 | 2038 | if (ret) |
436ad941 | 2039 | goto err_out4; |
bef4a34a | 2040 | } |
dac58241 S |
2041 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2042 | if (host->transportt == fc_transport_template) { | |
daf0cd44 CA |
2043 | struct fc_rport_identifiers ids = { |
2044 | .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, | |
2045 | }; | |
2046 | ||
dac58241 S |
2047 | fc_host_node_name(host) = stor_device->node_name; |
2048 | fc_host_port_name(host) = stor_device->port_name; | |
daf0cd44 | 2049 | stor_device->rport = fc_remote_port_add(host, 0, &ids); |
ca8dc694 DC |
2050 | if (!stor_device->rport) { |
2051 | ret = -ENOMEM; | |
436ad941 | 2052 | goto err_out4; |
ca8dc694 | 2053 | } |
dac58241 S |
2054 | } |
2055 | #endif | |
bd1f5d6a | 2056 | return 0; |
bef4a34a | 2057 | |
436ad941 | 2058 | err_out4: |
daf0cd44 CA |
2059 | scsi_remove_host(host); |
2060 | ||
436ad941 CA |
2061 | err_out3: |
2062 | destroy_workqueue(host_dev->handle_error_wq); | |
2063 | ||
ce3e301c | 2064 | err_out2: |
225ce6ea S |
2065 | /* |
2066 | * Once we have connected with the host, we would need to | |
2067 | * to invoke storvsc_dev_remove() to rollback this state and | |
2068 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 2069 | * err_out1 label. |
225ce6ea | 2070 | */ |
bd1f5d6a | 2071 | storvsc_dev_remove(device); |
ce3e301c | 2072 | goto err_out0; |
225ce6ea S |
2073 | |
2074 | err_out1: | |
d86adf48 | 2075 | kfree(stor_device->stor_chns); |
ce3e301c | 2076 | kfree(stor_device); |
225ce6ea S |
2077 | |
2078 | err_out0: | |
bd1f5d6a | 2079 | scsi_host_put(host); |
225ce6ea | 2080 | return ret; |
bef4a34a HJ |
2081 | } |
2082 | ||
adfbd028 BB |
2083 | /* Change a scsi target's queue depth */ |
2084 | static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) | |
2085 | { | |
2086 | if (queue_depth > scsi_driver.can_queue) | |
2087 | queue_depth = scsi_driver.can_queue; | |
2088 | ||
2089 | return scsi_change_queue_depth(sdev, queue_depth); | |
2090 | } | |
2091 | ||
ddcbf65e S |
2092 | static int storvsc_remove(struct hv_device *dev) |
2093 | { | |
2094 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
2095 | struct Scsi_Host *host = stor_device->host; | |
436ad941 | 2096 | struct hv_host_device *host_dev = shost_priv(host); |
ddcbf65e | 2097 | |
dac58241 | 2098 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
daf0cd44 CA |
2099 | if (host->transportt == fc_transport_template) { |
2100 | fc_remote_port_delete(stor_device->rport); | |
dac58241 | 2101 | fc_remove_host(host); |
daf0cd44 | 2102 | } |
dac58241 | 2103 | #endif |
436ad941 | 2104 | destroy_workqueue(host_dev->handle_error_wq); |
ddcbf65e S |
2105 | scsi_remove_host(host); |
2106 | storvsc_dev_remove(dev); | |
2107 | scsi_host_put(host); | |
2108 | ||
2109 | return 0; | |
2110 | } | |
2111 | ||
56fb1058 DC |
2112 | static int storvsc_suspend(struct hv_device *hv_dev) |
2113 | { | |
2114 | struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); | |
2115 | struct Scsi_Host *host = stor_device->host; | |
2116 | struct hv_host_device *host_dev = shost_priv(host); | |
2117 | ||
2118 | storvsc_wait_to_drain(stor_device); | |
2119 | ||
2120 | drain_workqueue(host_dev->handle_error_wq); | |
2121 | ||
2122 | vmbus_close(hv_dev->channel); | |
2123 | ||
56fb1058 DC |
2124 | kfree(stor_device->stor_chns); |
2125 | stor_device->stor_chns = NULL; | |
2126 | ||
2127 | cpumask_clear(&stor_device->alloced_cpus); | |
2128 | ||
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | static int storvsc_resume(struct hv_device *hv_dev) | |
2133 | { | |
2134 | int ret; | |
2135 | ||
2136 | ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, | |
2137 | hv_dev_is_fc(hv_dev)); | |
2138 | return ret; | |
2139 | } | |
2140 | ||
40bf63ed | 2141 | static struct hv_driver storvsc_drv = { |
fafb0efc | 2142 | .name = KBUILD_MODNAME, |
d847b5fe | 2143 | .id_table = id_table, |
40bf63ed S |
2144 | .probe = storvsc_probe, |
2145 | .remove = storvsc_remove, | |
56fb1058 DC |
2146 | .suspend = storvsc_suspend, |
2147 | .resume = storvsc_resume, | |
af0a5646 AV |
2148 | .driver = { |
2149 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
2150 | }, | |
39ae6fae | 2151 | }; |
7bd05b91 | 2152 | |
dac58241 S |
2153 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2154 | static struct fc_function_template fc_transport_functions = { | |
2155 | .show_host_node_name = 1, | |
2156 | .show_host_port_name = 1, | |
2157 | }; | |
2158 | #endif | |
2159 | ||
d9bbae83 | 2160 | static int __init storvsc_drv_init(void) |
f5c78872 | 2161 | { |
dac58241 | 2162 | int ret; |
01415ab3 S |
2163 | |
2164 | /* | |
2165 | * Divide the ring buffer data size (which is 1 page less | |
2166 | * than the ring buffer size since that page is reserved for | |
2167 | * the ring buffer indices) by the max request size (which is | |
2168 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
ab548fd2 APM |
2169 | * |
2170 | * The computation underestimates max_outstanding_req_per_channel | |
2171 | * for Win7 and older hosts because it does not take into account | |
2172 | * the vmscsi_size_delta correction to the max request size. | |
01415ab3 | 2173 | */ |
01415ab3 | 2174 | max_outstanding_req_per_channel = |
768fa219 GKH |
2175 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
2176 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
ab548fd2 | 2177 | sizeof(struct vstor_packet) + sizeof(u64), |
768fa219 | 2178 | sizeof(u64))); |
f5c78872 | 2179 | |
dac58241 S |
2180 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2181 | fc_transport_template = fc_attach_transport(&fc_transport_functions); | |
2182 | if (!fc_transport_template) | |
2183 | return -ENODEV; | |
2184 | #endif | |
2185 | ||
2186 | ret = vmbus_driver_register(&storvsc_drv); | |
2187 | ||
2188 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
2189 | if (ret) | |
2190 | fc_release_transport(fc_transport_template); | |
2191 | #endif | |
2192 | ||
2193 | return ret; | |
f5c78872 S |
2194 | } |
2195 | ||
c63ba9e1 | 2196 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 2197 | { |
768fa219 | 2198 | vmbus_driver_unregister(&storvsc_drv); |
dac58241 S |
2199 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2200 | fc_release_transport(fc_transport_template); | |
2201 | #endif | |
f5c78872 S |
2202 | } |
2203 | ||
ff568d3a | 2204 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 2205 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 2206 | module_init(storvsc_drv_init); |
c63ba9e1 | 2207 | module_exit(storvsc_drv_exit); |