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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; | |
a81a38cc | 369 | static unsigned int storvsc_max_hw_queues; |
af9584b8 S |
370 | |
371 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
372 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
373 | ||
a81a38cc MPM |
374 | module_param(storvsc_max_hw_queues, uint, 0644); |
375 | MODULE_PARM_DESC(storvsc_max_hw_queues, "Maximum number of hardware queues"); | |
376 | ||
f458aada | 377 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
74e26784 | 378 | MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
2217a47d LL |
379 | |
380 | static int ring_avail_percent_lowater = 10; | |
381 | module_param(ring_avail_percent_lowater, int, S_IRUGO); | |
382 | MODULE_PARM_DESC(ring_avail_percent_lowater, | |
383 | "Select a channel if available ring size > this in percent"); | |
384 | ||
893def38 S |
385 | /* |
386 | * Timeout in seconds for all devices managed by this driver. | |
387 | */ | |
388 | static int storvsc_timeout = 180; | |
389 | ||
dac58241 S |
390 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
391 | static struct scsi_transport_template *fc_transport_template; | |
392 | #endif | |
af9584b8 | 393 | |
453de21c | 394 | static struct scsi_host_template scsi_driver; |
6f94d5de S |
395 | static void storvsc_on_channel_callback(void *context); |
396 | ||
4cd83ecd S |
397 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
398 | #define STORVSC_MAX_TARGETS 2 | |
399 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 400 | |
4cd83ecd S |
401 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
402 | #define STORVSC_FC_MAX_TARGETS 128 | |
403 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 404 | |
4cd83ecd S |
405 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
406 | #define STORVSC_IDE_MAX_TARGETS 1 | |
407 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 408 | |
adae1e93 AB |
409 | /* |
410 | * Upper bound on the size of a storvsc packet. vmscsi_size_delta is not | |
411 | * included in the calculation because it is set after STORVSC_MAX_PKT_SIZE | |
412 | * is used in storvsc_connect_to_vsp | |
413 | */ | |
414 | #define STORVSC_MAX_PKT_SIZE (sizeof(struct vmpacket_descriptor) +\ | |
415 | sizeof(struct vstor_packet)) | |
416 | ||
61eaffc9 | 417 | struct storvsc_cmd_request { |
61eaffc9 S |
418 | struct scsi_cmnd *cmd; |
419 | ||
f0d79fe9 S |
420 | struct hv_device *device; |
421 | ||
422 | /* Synchronize the request/response if needed */ | |
423 | struct completion wait_event; | |
424 | ||
be0cf6ca S |
425 | struct vmbus_channel_packet_multipage_buffer mpb; |
426 | struct vmbus_packet_mpb_array *payload; | |
427 | u32 payload_sz; | |
428 | ||
f0d79fe9 S |
429 | struct vstor_packet vstor_packet; |
430 | }; | |
431 | ||
432 | ||
f0d79fe9 S |
433 | /* A storvsc device is a device object that contains a vmbus channel */ |
434 | struct storvsc_device { | |
435 | struct hv_device *device; | |
436 | ||
437 | bool destroy; | |
438 | bool drain_notify; | |
439 | atomic_t num_outstanding_req; | |
cd654ea1 | 440 | struct Scsi_Host *host; |
f0d79fe9 S |
441 | |
442 | wait_queue_head_t waiting_to_drain; | |
443 | ||
444 | /* | |
445 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
446 | * controller. In reality, the pathid, targetid is always 0 | |
447 | * and the port is set by us | |
448 | */ | |
449 | unsigned int port_number; | |
450 | unsigned char path_id; | |
451 | unsigned char target_id; | |
452 | ||
244808e0 APM |
453 | /* |
454 | * The size of the vmscsi_request has changed in win8. The | |
455 | * additional size is because of new elements added to the | |
456 | * structure. These elements are valid only when we are talking | |
457 | * to a win8 host. | |
458 | * Track the correction to size we need to apply. This value | |
459 | * will likely change during protocol negotiation but it is | |
460 | * valid to start by assuming pre-Win8. | |
461 | */ | |
462 | int vmscsi_size_delta; | |
463 | ||
5117b936 S |
464 | /* |
465 | * Max I/O, the device can support. | |
466 | */ | |
467 | u32 max_transfer_bytes; | |
d86adf48 S |
468 | /* |
469 | * Number of sub-channels we will open. | |
470 | */ | |
471 | u16 num_sc; | |
472 | struct vmbus_channel **stor_chns; | |
473 | /* | |
474 | * Mask of CPUs bound to subchannels. | |
475 | */ | |
476 | struct cpumask alloced_cpus; | |
21d2052c APM |
477 | /* |
478 | * Serializes modifications of stor_chns[] from storvsc_do_io() | |
479 | * and storvsc_change_target_cpu(). | |
480 | */ | |
481 | spinlock_t lock; | |
f0d79fe9 | 482 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
483 | struct storvsc_cmd_request init_request; |
484 | struct storvsc_cmd_request reset_request; | |
dac58241 S |
485 | /* |
486 | * Currently active port and node names for FC devices. | |
487 | */ | |
488 | u64 node_name; | |
489 | u64 port_name; | |
daf0cd44 CA |
490 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
491 | struct fc_rport *rport; | |
492 | #endif | |
f0d79fe9 S |
493 | }; |
494 | ||
ce3e301c S |
495 | struct hv_host_device { |
496 | struct hv_device *dev; | |
c1b3d067 S |
497 | unsigned int port; |
498 | unsigned char path; | |
499 | unsigned char target; | |
436ad941 | 500 | struct workqueue_struct *handle_error_wq; |
c58cc70f LL |
501 | struct work_struct host_scan_work; |
502 | struct Scsi_Host *host; | |
c1b3d067 S |
503 | }; |
504 | ||
12675799 S |
505 | struct storvsc_scan_work { |
506 | struct work_struct work; | |
507 | struct Scsi_Host *host; | |
98441221 S |
508 | u8 lun; |
509 | u8 tgt_id; | |
12675799 S |
510 | }; |
511 | ||
6781209e S |
512 | static void storvsc_device_scan(struct work_struct *work) |
513 | { | |
514 | struct storvsc_scan_work *wrk; | |
6781209e S |
515 | struct scsi_device *sdev; |
516 | ||
517 | wrk = container_of(work, struct storvsc_scan_work, work); | |
6781209e | 518 | |
98441221 | 519 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
6781209e S |
520 | if (!sdev) |
521 | goto done; | |
522 | scsi_rescan_device(&sdev->sdev_gendev); | |
523 | scsi_device_put(sdev); | |
524 | ||
525 | done: | |
526 | kfree(wrk); | |
527 | } | |
528 | ||
2a09ed3d | 529 | static void storvsc_host_scan(struct work_struct *work) |
12675799 | 530 | { |
2a09ed3d | 531 | struct Scsi_Host *host; |
34a716bc | 532 | struct scsi_device *sdev; |
c58cc70f LL |
533 | struct hv_host_device *host_device = |
534 | container_of(work, struct hv_host_device, host_scan_work); | |
12675799 | 535 | |
c58cc70f | 536 | host = host_device->host; |
34a716bc S |
537 | /* |
538 | * Before scanning the host, first check to see if any of the | |
539 | * currrently known devices have been hot removed. We issue a | |
540 | * "unit ready" command against all currently known devices. | |
541 | * This I/O will result in an error for devices that have been | |
542 | * removed. As part of handling the I/O error, we remove the device. | |
543 | * | |
544 | * When a LUN is added or removed, the host sends us a signal to | |
545 | * scan the host. Thus we are forced to discover the LUNs that | |
546 | * may have been removed this way. | |
547 | */ | |
548 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 549 | shost_for_each_device(sdev, host) |
34a716bc | 550 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
551 | mutex_unlock(&host->scan_mutex); |
552 | /* | |
553 | * Now scan the host to discover LUNs that may have been added. | |
554 | */ | |
2a09ed3d | 555 | scsi_scan_host(host); |
12675799 S |
556 | } |
557 | ||
b4017319 S |
558 | static void storvsc_remove_lun(struct work_struct *work) |
559 | { | |
560 | struct storvsc_scan_work *wrk; | |
561 | struct scsi_device *sdev; | |
562 | ||
563 | wrk = container_of(work, struct storvsc_scan_work, work); | |
564 | if (!scsi_host_get(wrk->host)) | |
565 | goto done; | |
566 | ||
98441221 | 567 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
b4017319 S |
568 | |
569 | if (sdev) { | |
570 | scsi_remove_device(sdev); | |
571 | scsi_device_put(sdev); | |
572 | } | |
573 | scsi_host_put(wrk->host); | |
574 | ||
575 | done: | |
576 | kfree(wrk); | |
577 | } | |
578 | ||
af9584b8 | 579 | |
a8c18c57 S |
580 | /* |
581 | * We can get incoming messages from the host that are not in response to | |
582 | * messages that we have sent out. An example of this would be messages | |
583 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
584 | * deal with potential race conditions where the driver may be in the | |
585 | * midst of being unloaded when we might receive an unsolicited message | |
586 | * from the host, we have implemented a mechanism to gurantee sequential | |
587 | * consistency: | |
588 | * | |
589 | * 1) Once the device is marked as being destroyed, we will fail all | |
590 | * outgoing messages. | |
591 | * 2) We permit incoming messages when the device is being destroyed, | |
592 | * only to properly account for messages already sent out. | |
593 | */ | |
594 | ||
f0d79fe9 S |
595 | static inline struct storvsc_device *get_out_stor_device( |
596 | struct hv_device *device) | |
597 | { | |
598 | struct storvsc_device *stor_device; | |
599 | ||
cd654ea1 | 600 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
601 | |
602 | if (stor_device && stor_device->destroy) | |
603 | stor_device = NULL; | |
604 | ||
605 | return stor_device; | |
606 | } | |
607 | ||
608 | ||
609 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
610 | { | |
611 | dev->drain_notify = true; | |
612 | wait_event(dev->waiting_to_drain, | |
613 | atomic_read(&dev->num_outstanding_req) == 0); | |
614 | dev->drain_notify = false; | |
615 | } | |
bef4a34a | 616 | |
8dcf37d4 S |
617 | static inline struct storvsc_device *get_in_stor_device( |
618 | struct hv_device *device) | |
619 | { | |
620 | struct storvsc_device *stor_device; | |
8dcf37d4 | 621 | |
cd654ea1 | 622 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
623 | |
624 | if (!stor_device) | |
625 | goto get_in_err; | |
626 | ||
627 | /* | |
628 | * If the device is being destroyed; allow incoming | |
629 | * traffic only to cleanup outstanding requests. | |
630 | */ | |
631 | ||
632 | if (stor_device->destroy && | |
633 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
634 | stor_device = NULL; | |
635 | ||
636 | get_in_err: | |
8dcf37d4 S |
637 | return stor_device; |
638 | ||
639 | } | |
640 | ||
7769e18c APM |
641 | static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, |
642 | u32 new) | |
643 | { | |
644 | struct storvsc_device *stor_device; | |
645 | struct vmbus_channel *cur_chn; | |
646 | bool old_is_alloced = false; | |
647 | struct hv_device *device; | |
648 | unsigned long flags; | |
649 | int cpu; | |
650 | ||
651 | device = channel->primary_channel ? | |
652 | channel->primary_channel->device_obj | |
653 | : channel->device_obj; | |
654 | stor_device = get_out_stor_device(device); | |
655 | if (!stor_device) | |
656 | return; | |
657 | ||
658 | /* See storvsc_do_io() -> get_og_chn(). */ | |
21d2052c | 659 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
660 | |
661 | /* | |
662 | * Determines if the storvsc device has other channels assigned to | |
663 | * the "old" CPU to update the alloced_cpus mask and the stor_chns | |
664 | * array. | |
665 | */ | |
666 | if (device->channel != channel && device->channel->target_cpu == old) { | |
667 | cur_chn = device->channel; | |
668 | old_is_alloced = true; | |
669 | goto old_is_alloced; | |
670 | } | |
671 | list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { | |
672 | if (cur_chn == channel) | |
673 | continue; | |
674 | if (cur_chn->target_cpu == old) { | |
675 | old_is_alloced = true; | |
676 | goto old_is_alloced; | |
677 | } | |
678 | } | |
679 | ||
680 | old_is_alloced: | |
681 | if (old_is_alloced) | |
682 | WRITE_ONCE(stor_device->stor_chns[old], cur_chn); | |
683 | else | |
684 | cpumask_clear_cpu(old, &stor_device->alloced_cpus); | |
685 | ||
686 | /* "Flush" the stor_chns array. */ | |
687 | for_each_possible_cpu(cpu) { | |
688 | if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( | |
689 | cpu, &stor_device->alloced_cpus)) | |
690 | WRITE_ONCE(stor_device->stor_chns[cpu], NULL); | |
691 | } | |
692 | ||
693 | WRITE_ONCE(stor_device->stor_chns[new], channel); | |
694 | cpumask_set_cpu(new, &stor_device->alloced_cpus); | |
695 | ||
21d2052c | 696 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
697 | } |
698 | ||
bf5fd8ca APM |
699 | static u64 storvsc_next_request_id(struct vmbus_channel *channel, u64 rqst_addr) |
700 | { | |
701 | struct storvsc_cmd_request *request = | |
702 | (struct storvsc_cmd_request *)(unsigned long)rqst_addr; | |
703 | ||
704 | if (rqst_addr == VMBUS_RQST_INIT) | |
705 | return VMBUS_RQST_INIT; | |
706 | if (rqst_addr == VMBUS_RQST_RESET) | |
707 | return VMBUS_RQST_RESET; | |
708 | ||
709 | /* | |
710 | * Cannot return an ID of 0, which is reserved for an unsolicited | |
711 | * message from Hyper-V. | |
712 | */ | |
713 | return (u64)blk_mq_unique_tag(request->cmd->request) + 1; | |
714 | } | |
715 | ||
6f94d5de S |
716 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
717 | { | |
718 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
c9675904 | 719 | struct device *dev = &device->device; |
6f94d5de S |
720 | struct storvsc_device *stor_device; |
721 | struct vmstorage_channel_properties props; | |
c9675904 | 722 | int ret; |
6f94d5de S |
723 | |
724 | stor_device = get_out_stor_device(device); | |
725 | if (!stor_device) | |
726 | return; | |
727 | ||
6f94d5de | 728 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
adae1e93 | 729 | new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
6f94d5de | 730 | |
bf5fd8ca | 731 | new_sc->next_request_id_callback = storvsc_next_request_id; |
453de21c | 732 | |
c9675904 DC |
733 | ret = vmbus_open(new_sc, |
734 | storvsc_ringbuffer_size, | |
735 | storvsc_ringbuffer_size, | |
736 | (void *)&props, | |
737 | sizeof(struct vmstorage_channel_properties), | |
738 | storvsc_on_channel_callback, new_sc); | |
d86adf48 | 739 | |
c9675904 DC |
740 | /* In case vmbus_open() fails, we don't use the sub-channel. */ |
741 | if (ret != 0) { | |
742 | dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); | |
743 | return; | |
d86adf48 | 744 | } |
c9675904 | 745 | |
7769e18c APM |
746 | new_sc->change_target_cpu_callback = storvsc_change_target_cpu; |
747 | ||
c9675904 DC |
748 | /* Add the sub-channel to the array of available channels. */ |
749 | stor_device->stor_chns[new_sc->target_cpu] = new_sc; | |
750 | cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); | |
6f94d5de S |
751 | } |
752 | ||
753 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
754 | { | |
c9675904 | 755 | struct device *dev = &device->device; |
6f94d5de | 756 | struct storvsc_device *stor_device; |
6f94d5de S |
757 | int num_sc; |
758 | struct storvsc_cmd_request *request; | |
759 | struct vstor_packet *vstor_packet; | |
760 | int ret, t; | |
761 | ||
382e06d1 MK |
762 | /* |
763 | * If the number of CPUs is artificially restricted, such as | |
764 | * with maxcpus=1 on the kernel boot line, Hyper-V could offer | |
765 | * sub-channels >= the number of CPUs. These sub-channels | |
766 | * should not be created. The primary channel is already created | |
767 | * and assigned to one CPU, so check against # CPUs - 1. | |
768 | */ | |
769 | num_sc = min((int)(num_online_cpus() - 1), max_chns); | |
770 | if (!num_sc) | |
771 | return; | |
772 | ||
6f94d5de S |
773 | stor_device = get_out_stor_device(device); |
774 | if (!stor_device) | |
775 | return; | |
776 | ||
d86adf48 | 777 | stor_device->num_sc = num_sc; |
6f94d5de S |
778 | request = &stor_device->init_request; |
779 | vstor_packet = &request->vstor_packet; | |
780 | ||
6f94d5de S |
781 | /* |
782 | * Establish a handler for dealing with subchannels. | |
783 | */ | |
784 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
785 | ||
6f94d5de S |
786 | /* |
787 | * Request the host to create sub-channels. | |
788 | */ | |
789 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
790 | init_completion(&request->wait_event); | |
791 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
792 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
793 | vstor_packet->sub_channel_count = num_sc; | |
794 | ||
795 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
796 | (sizeof(struct vstor_packet) - | |
244808e0 | 797 | stor_device->vmscsi_size_delta), |
bf5fd8ca | 798 | VMBUS_RQST_INIT, |
6f94d5de S |
799 | VM_PKT_DATA_INBAND, |
800 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
801 | ||
c9675904 DC |
802 | if (ret != 0) { |
803 | dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); | |
6f94d5de | 804 | return; |
c9675904 | 805 | } |
6f94d5de S |
806 | |
807 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
c9675904 DC |
808 | if (t == 0) { |
809 | dev_err(dev, "Failed to create sub-channel: timed out\n"); | |
6f94d5de | 810 | return; |
c9675904 | 811 | } |
6f94d5de S |
812 | |
813 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
c9675904 DC |
814 | vstor_packet->status != 0) { |
815 | dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", | |
816 | vstor_packet->operation, vstor_packet->status); | |
6f94d5de | 817 | return; |
c9675904 | 818 | } |
6f94d5de S |
819 | |
820 | /* | |
c9675904 DC |
821 | * We need to do nothing here, because vmbus_process_offer() |
822 | * invokes channel->sc_creation_callback, which will open and use | |
823 | * the sub-channel(s). | |
6f94d5de | 824 | */ |
6f94d5de S |
825 | } |
826 | ||
dac58241 S |
827 | static void cache_wwn(struct storvsc_device *stor_device, |
828 | struct vstor_packet *vstor_packet) | |
829 | { | |
830 | /* | |
831 | * Cache the currently active port and node ww names. | |
832 | */ | |
833 | if (vstor_packet->wwn_packet.primary_active) { | |
834 | stor_device->node_name = | |
835 | wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); | |
836 | stor_device->port_name = | |
837 | wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); | |
838 | } else { | |
839 | stor_device->node_name = | |
840 | wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); | |
841 | stor_device->port_name = | |
842 | wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); | |
843 | } | |
844 | } | |
845 | ||
59635018 S |
846 | |
847 | static int storvsc_execute_vstor_op(struct hv_device *device, | |
848 | struct storvsc_cmd_request *request, | |
849 | bool status_check) | |
8dcf37d4 | 850 | { |
244808e0 | 851 | struct storvsc_device *stor_device; |
8dcf37d4 | 852 | struct vstor_packet *vstor_packet; |
59635018 | 853 | int ret, t; |
8dcf37d4 | 854 | |
244808e0 APM |
855 | stor_device = get_out_stor_device(device); |
856 | if (!stor_device) | |
857 | return -ENODEV; | |
858 | ||
8dcf37d4 S |
859 | vstor_packet = &request->vstor_packet; |
860 | ||
8dcf37d4 | 861 | init_completion(&request->wait_event); |
8dcf37d4 S |
862 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
863 | ||
864 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 | 865 | (sizeof(struct vstor_packet) - |
244808e0 | 866 | stor_device->vmscsi_size_delta), |
bf5fd8ca | 867 | VMBUS_RQST_INIT, |
8dcf37d4 S |
868 | VM_PKT_DATA_INBAND, |
869 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
870 | if (ret != 0) | |
dac58241 | 871 | return ret; |
8dcf37d4 S |
872 | |
873 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
dac58241 S |
874 | if (t == 0) |
875 | return -ETIMEDOUT; | |
8dcf37d4 | 876 | |
59635018 S |
877 | if (!status_check) |
878 | return ret; | |
879 | ||
8dcf37d4 | 880 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
dac58241 S |
881 | vstor_packet->status != 0) |
882 | return -EINVAL; | |
8dcf37d4 | 883 | |
59635018 S |
884 | return ret; |
885 | } | |
886 | ||
887 | static int storvsc_channel_init(struct hv_device *device, bool is_fc) | |
888 | { | |
889 | struct storvsc_device *stor_device; | |
890 | struct storvsc_cmd_request *request; | |
891 | struct vstor_packet *vstor_packet; | |
892 | int ret, i; | |
893 | int max_chns; | |
894 | bool process_sub_channels = false; | |
895 | ||
896 | stor_device = get_out_stor_device(device); | |
897 | if (!stor_device) | |
898 | return -ENODEV; | |
899 | ||
900 | request = &stor_device->init_request; | |
901 | vstor_packet = &request->vstor_packet; | |
902 | ||
903 | /* | |
904 | * Now, initiate the vsc/vsp initialization protocol on the open | |
905 | * channel | |
906 | */ | |
907 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
908 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
909 | ret = storvsc_execute_vstor_op(device, request, true); | |
910 | if (ret) | |
911 | return ret; | |
912 | /* | |
913 | * Query host supported protocol version. | |
914 | */ | |
8dcf37d4 | 915 | |
1a363108 KM |
916 | for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
917 | /* reuse the packet for version range supported */ | |
918 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
919 | vstor_packet->operation = | |
920 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
8dcf37d4 | 921 | |
1a363108 KM |
922 | vstor_packet->version.major_minor = |
923 | vmstor_protocols[i].protocol_version; | |
85904a5e | 924 | |
1a363108 KM |
925 | /* |
926 | * The revision number is only used in Windows; set it to 0. | |
927 | */ | |
928 | vstor_packet->version.revision = 0; | |
59635018 | 929 | ret = storvsc_execute_vstor_op(device, request, false); |
1a363108 | 930 | if (ret != 0) |
dac58241 | 931 | return ret; |
8dcf37d4 | 932 | |
dac58241 S |
933 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
934 | return -EINVAL; | |
1a363108 KM |
935 | |
936 | if (vstor_packet->status == 0) { | |
937 | vmstor_proto_version = | |
938 | vmstor_protocols[i].protocol_version; | |
939 | ||
940 | sense_buffer_size = | |
941 | vmstor_protocols[i].sense_buffer_size; | |
942 | ||
244808e0 | 943 | stor_device->vmscsi_size_delta = |
1a363108 KM |
944 | vmstor_protocols[i].vmscsi_size_delta; |
945 | ||
946 | break; | |
947 | } | |
8dcf37d4 S |
948 | } |
949 | ||
dac58241 S |
950 | if (vstor_packet->status != 0) |
951 | return -EINVAL; | |
8dcf37d4 S |
952 | |
953 | ||
954 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
955 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
59635018 | 956 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 957 | if (ret != 0) |
dac58241 | 958 | return ret; |
8dcf37d4 | 959 | |
6f94d5de S |
960 | /* |
961 | * Check to see if multi-channel support is there. | |
962 | * Hosts that implement protocol version of 5.1 and above | |
963 | * support multi-channel. | |
964 | */ | |
965 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
d86adf48 S |
966 | |
967 | /* | |
968 | * Allocate state to manage the sub-channels. | |
969 | * We allocate an array based on the numbers of possible CPUs | |
970 | * (Hyper-V does not support cpu online/offline). | |
971 | * This Array will be sparseley populated with unique | |
972 | * channels - primary + sub-channels. | |
973 | * We will however populate all the slots to evenly distribute | |
974 | * the load. | |
975 | */ | |
e0408528 | 976 | stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), |
d86adf48 S |
977 | GFP_KERNEL); |
978 | if (stor_device->stor_chns == NULL) | |
979 | return -ENOMEM; | |
980 | ||
7769e18c APM |
981 | device->channel->change_target_cpu_callback = storvsc_change_target_cpu; |
982 | ||
d86adf48 S |
983 | stor_device->stor_chns[device->channel->target_cpu] = device->channel; |
984 | cpumask_set_cpu(device->channel->target_cpu, | |
985 | &stor_device->alloced_cpus); | |
986 | ||
e6c4bc66 | 987 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
6f94d5de S |
988 | if (vstor_packet->storage_channel_properties.flags & |
989 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
990 | process_sub_channels = true; | |
991 | } | |
5117b936 S |
992 | stor_device->max_transfer_bytes = |
993 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 994 | |
dac58241 S |
995 | if (!is_fc) |
996 | goto done; | |
997 | ||
59635018 S |
998 | /* |
999 | * For FC devices retrieve FC HBA data. | |
1000 | */ | |
dac58241 S |
1001 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
1002 | vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; | |
59635018 | 1003 | ret = storvsc_execute_vstor_op(device, request, true); |
dac58241 S |
1004 | if (ret != 0) |
1005 | return ret; | |
1006 | ||
dac58241 S |
1007 | /* |
1008 | * Cache the currently active port and node ww names. | |
1009 | */ | |
1010 | cache_wwn(stor_device, vstor_packet); | |
1011 | ||
1012 | done: | |
1013 | ||
8dcf37d4 S |
1014 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
1015 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
59635018 | 1016 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 1017 | if (ret != 0) |
dac58241 | 1018 | return ret; |
8dcf37d4 | 1019 | |
6f94d5de S |
1020 | if (process_sub_channels) |
1021 | handle_multichannel_storage(device, max_chns); | |
1022 | ||
8dcf37d4 S |
1023 | return ret; |
1024 | } | |
1025 | ||
c50bd448 S |
1026 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
1027 | struct scsi_cmnd *scmnd, | |
1028 | struct Scsi_Host *host, | |
1029 | u8 asc, u8 ascq) | |
1030 | { | |
1031 | struct storvsc_scan_work *wrk; | |
1032 | void (*process_err_fn)(struct work_struct *work); | |
436ad941 | 1033 | struct hv_host_device *host_dev = shost_priv(host); |
c50bd448 | 1034 | |
52e1b3b3 MK |
1035 | /* |
1036 | * In some situations, Hyper-V sets multiple bits in the | |
1037 | * srb_status, such as ABORTED and ERROR. So process them | |
1038 | * individually, with the most specific bits first. | |
1039 | */ | |
1040 | ||
1041 | if (vm_srb->srb_status & SRB_STATUS_INVALID_LUN) { | |
1042 | set_host_byte(scmnd, DID_NO_CONNECT); | |
1043 | process_err_fn = storvsc_remove_lun; | |
1044 | goto do_work; | |
1045 | } | |
1046 | ||
1047 | if (vm_srb->srb_status & SRB_STATUS_ABORTED) { | |
1048 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && | |
1049 | /* Capacity data has changed */ | |
1050 | (asc == 0x2a) && (ascq == 0x9)) { | |
1051 | process_err_fn = storvsc_device_scan; | |
1052 | /* | |
1053 | * Retry the I/O that triggered this. | |
1054 | */ | |
1055 | set_host_byte(scmnd, DID_REQUEUE); | |
1056 | goto do_work; | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | if (vm_srb->srb_status & SRB_STATUS_ERROR) { | |
bba5dc33 LL |
1061 | /* |
1062 | * Let upper layer deal with error when | |
1063 | * sense message is present. | |
1064 | */ | |
bba5dc33 | 1065 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) |
52e1b3b3 MK |
1066 | return; |
1067 | ||
c50bd448 S |
1068 | /* |
1069 | * If there is an error; offline the device since all | |
1070 | * error recovery strategies would have already been | |
1071 | * deployed on the host side. However, if the command | |
1072 | * were a pass-through command deal with it appropriately. | |
1073 | */ | |
1074 | switch (scmnd->cmnd[0]) { | |
1075 | case ATA_16: | |
1076 | case ATA_12: | |
1077 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1078 | break; | |
3533f860 | 1079 | /* |
52e1b3b3 MK |
1080 | * On some Hyper-V hosts TEST_UNIT_READY command can |
1081 | * return SRB_STATUS_ERROR. Let the upper level code | |
1082 | * deal with it based on the sense information. | |
3533f860 S |
1083 | */ |
1084 | case TEST_UNIT_READY: | |
1085 | break; | |
c50bd448 | 1086 | default: |
d1b8b239 | 1087 | set_host_byte(scmnd, DID_ERROR); |
c50bd448 | 1088 | } |
c50bd448 | 1089 | } |
52e1b3b3 | 1090 | return; |
6781209e | 1091 | |
52e1b3b3 | 1092 | do_work: |
c50bd448 S |
1093 | /* |
1094 | * We need to schedule work to process this error; schedule it. | |
1095 | */ | |
1096 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1097 | if (!wrk) { | |
1098 | set_host_byte(scmnd, DID_TARGET_FAILURE); | |
1099 | return; | |
1100 | } | |
1101 | ||
1102 | wrk->host = host; | |
1103 | wrk->lun = vm_srb->lun; | |
98441221 | 1104 | wrk->tgt_id = vm_srb->target_id; |
c50bd448 | 1105 | INIT_WORK(&wrk->work, process_err_fn); |
436ad941 | 1106 | queue_work(host_dev->handle_error_wq, &wrk->work); |
c50bd448 S |
1107 | } |
1108 | ||
2707388c | 1109 | |
03996f20 S |
1110 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
1111 | struct storvsc_device *stor_dev) | |
8dcf37d4 | 1112 | { |
2707388c | 1113 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
2707388c S |
1114 | struct scsi_sense_hdr sense_hdr; |
1115 | struct vmscsi_request *vm_srb; | |
40630f46 | 1116 | u32 data_transfer_length; |
c50bd448 | 1117 | struct Scsi_Host *host; |
be0cf6ca S |
1118 | u32 payload_sz = cmd_request->payload_sz; |
1119 | void *payload = cmd_request->payload; | |
08f76547 | 1120 | bool sense_ok; |
c50bd448 | 1121 | |
c50bd448 | 1122 | host = stor_dev->host; |
8dcf37d4 | 1123 | |
61eaffc9 | 1124 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
40630f46 | 1125 | data_transfer_length = vm_srb->data_transfer_length; |
8dcf37d4 | 1126 | |
42e22cac S |
1127 | scmnd->result = vm_srb->scsi_status; |
1128 | ||
2707388c | 1129 | if (scmnd->result) { |
08f76547 MK |
1130 | sense_ok = scsi_normalize_sense(scmnd->sense_buffer, |
1131 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
1132 | ||
1133 | if (sense_ok && do_logging(STORVSC_LOGGING_WARN)) | |
d811b848 HR |
1134 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1135 | &sense_hdr); | |
2707388c S |
1136 | } |
1137 | ||
40630f46 | 1138 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { |
c50bd448 S |
1139 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
1140 | sense_hdr.ascq); | |
40630f46 LL |
1141 | /* |
1142 | * The Windows driver set data_transfer_length on | |
1143 | * SRB_STATUS_DATA_OVERRUN. On other errors, this value | |
1144 | * is untouched. In these cases we set it to 0. | |
1145 | */ | |
1146 | if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) | |
1147 | data_transfer_length = 0; | |
1148 | } | |
c50bd448 | 1149 | |
0a765665 AB |
1150 | /* Validate data_transfer_length (from Hyper-V) */ |
1151 | if (data_transfer_length > cmd_request->payload->range.len) | |
1152 | data_transfer_length = cmd_request->payload->range.len; | |
1153 | ||
2707388c | 1154 | scsi_set_resid(scmnd, |
40630f46 | 1155 | cmd_request->payload->range.len - data_transfer_length); |
2707388c | 1156 | |
ead3700d | 1157 | scmnd->scsi_done(scmnd); |
be0cf6ca S |
1158 | |
1159 | if (payload_sz > | |
1160 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1161 | kfree(payload); | |
2707388c S |
1162 | } |
1163 | ||
03996f20 | 1164 | static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
2707388c | 1165 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1166 | struct storvsc_cmd_request *request) |
2707388c | 1167 | { |
2707388c | 1168 | struct vstor_packet *stor_pkt; |
03996f20 | 1169 | struct hv_device *device = stor_device->device; |
2707388c | 1170 | |
2707388c S |
1171 | stor_pkt = &request->vstor_packet; |
1172 | ||
1173 | /* | |
1174 | * The current SCSI handling on the host side does | |
1175 | * not correctly handle: | |
1176 | * INQUIRY command with page code parameter set to 0x80 | |
1177 | * MODE_SENSE command with cmd[2] == 0x1c | |
1178 | * | |
1179 | * Setup srb and scsi status so this won't be fatal. | |
1180 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1181 | * (srb status == 0x4) and off-line the device in that case. |
1182 | */ | |
1183 | ||
1184 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1185 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1186 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1187 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1188 | } |
1189 | ||
8dcf37d4 S |
1190 | /* Copy over the status...etc */ |
1191 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1192 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
0a765665 | 1193 | |
d4674859 MK |
1194 | /* |
1195 | * Copy over the sense_info_length, but limit to the known max | |
1196 | * size if Hyper-V returns a bad value. | |
1197 | */ | |
1198 | stor_pkt->vm_srb.sense_info_length = min_t(u8, sense_buffer_size, | |
1199 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 | 1200 | |
f8aea701 LL |
1201 | if (vstor_packet->vm_srb.scsi_status != 0 || |
1202 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) | |
08f76547 MK |
1203 | storvsc_log(device, STORVSC_LOGGING_ERROR, |
1204 | "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", | |
1205 | request->cmd->request->tag, | |
f8aea701 LL |
1206 | stor_pkt->vm_srb.cdb[0], |
1207 | vstor_packet->vm_srb.scsi_status, | |
08f76547 MK |
1208 | vstor_packet->vm_srb.srb_status, |
1209 | vstor_packet->status); | |
f8aea701 | 1210 | |
d4674859 MK |
1211 | if (vstor_packet->vm_srb.scsi_status == SAM_STAT_CHECK_CONDITION && |
1212 | (vstor_packet->vm_srb.srb_status & SRB_STATUS_AUTOSENSE_VALID)) | |
1213 | memcpy(request->cmd->sense_buffer, | |
1214 | vstor_packet->vm_srb.sense_data, | |
1215 | stor_pkt->vm_srb.sense_info_length); | |
8dcf37d4 S |
1216 | |
1217 | stor_pkt->vm_srb.data_transfer_length = | |
d4674859 | 1218 | vstor_packet->vm_srb.data_transfer_length; |
8dcf37d4 | 1219 | |
03996f20 | 1220 | storvsc_command_completion(request, stor_device); |
8dcf37d4 S |
1221 | |
1222 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1223 | stor_device->drain_notify) | |
1224 | wake_up(&stor_device->waiting_to_drain); | |
8dcf37d4 S |
1225 | } |
1226 | ||
03996f20 | 1227 | static void storvsc_on_receive(struct storvsc_device *stor_device, |
8dcf37d4 | 1228 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1229 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1230 | { |
c58cc70f | 1231 | struct hv_host_device *host_dev; |
8dcf37d4 S |
1232 | switch (vstor_packet->operation) { |
1233 | case VSTOR_OPERATION_COMPLETE_IO: | |
03996f20 | 1234 | storvsc_on_io_completion(stor_device, vstor_packet, request); |
8dcf37d4 | 1235 | break; |
12675799 | 1236 | |
8dcf37d4 | 1237 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 | 1238 | case VSTOR_OPERATION_ENUMERATE_BUS: |
c58cc70f LL |
1239 | host_dev = shost_priv(stor_device->host); |
1240 | queue_work( | |
1241 | host_dev->handle_error_wq, &host_dev->host_scan_work); | |
12675799 | 1242 | break; |
8dcf37d4 | 1243 | |
dac58241 | 1244 | case VSTOR_OPERATION_FCHBA_DATA: |
dac58241 S |
1245 | cache_wwn(stor_device, vstor_packet); |
1246 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1247 | fc_host_node_name(stor_device->host) = stor_device->node_name; | |
1248 | fc_host_port_name(stor_device->host) = stor_device->port_name; | |
1249 | #endif | |
1250 | break; | |
8dcf37d4 S |
1251 | default: |
1252 | break; | |
1253 | } | |
1254 | } | |
1255 | ||
1256 | static void storvsc_on_channel_callback(void *context) | |
1257 | { | |
6f94d5de | 1258 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
ddccd952 | 1259 | const struct vmpacket_descriptor *desc; |
6f94d5de | 1260 | struct hv_device *device; |
8dcf37d4 | 1261 | struct storvsc_device *stor_device; |
bf5fd8ca | 1262 | struct Scsi_Host *shost; |
8dcf37d4 | 1263 | |
6f94d5de S |
1264 | if (channel->primary_channel != NULL) |
1265 | device = channel->primary_channel->device_obj; | |
1266 | else | |
1267 | device = channel->device_obj; | |
8dcf37d4 S |
1268 | |
1269 | stor_device = get_in_stor_device(device); | |
1270 | if (!stor_device) | |
1271 | return; | |
1272 | ||
bf5fd8ca | 1273 | shost = stor_device->host; |
ddccd952 | 1274 | |
bf5fd8ca APM |
1275 | foreach_vmbus_pkt(desc, channel) { |
1276 | struct vstor_packet *packet = hv_pkt_data(desc); | |
1277 | struct storvsc_cmd_request *request = NULL; | |
1278 | u64 rqst_id = desc->trans_id; | |
ddccd952 | 1279 | |
91b1b640 APM |
1280 | if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) - |
1281 | stor_device->vmscsi_size_delta) { | |
1282 | dev_err(&device->device, "Invalid packet len\n"); | |
1283 | continue; | |
1284 | } | |
1285 | ||
bf5fd8ca APM |
1286 | if (rqst_id == VMBUS_RQST_INIT) { |
1287 | request = &stor_device->init_request; | |
1288 | } else if (rqst_id == VMBUS_RQST_RESET) { | |
1289 | request = &stor_device->reset_request; | |
8dcf37d4 | 1290 | } else { |
bf5fd8ca APM |
1291 | /* Hyper-V can send an unsolicited message with ID of 0 */ |
1292 | if (rqst_id == 0) { | |
1293 | /* | |
1294 | * storvsc_on_receive() looks at the vstor_packet in the message | |
1295 | * from the ring buffer. If the operation in the vstor_packet is | |
1296 | * COMPLETE_IO, then we call storvsc_on_io_completion(), and | |
1297 | * dereference the guest memory address. Make sure we don't call | |
1298 | * storvsc_on_io_completion() with a guest memory address that is | |
1299 | * zero if Hyper-V were to construct and send such a bogus packet. | |
1300 | */ | |
1301 | if (packet->operation == VSTOR_OPERATION_COMPLETE_IO) { | |
1302 | dev_err(&device->device, "Invalid packet with ID of 0\n"); | |
1303 | continue; | |
1304 | } | |
1305 | } else { | |
1306 | struct scsi_cmnd *scmnd; | |
1307 | ||
1308 | /* Transaction 'rqst_id' corresponds to tag 'rqst_id - 1' */ | |
1309 | scmnd = scsi_host_find_tag(shost, rqst_id - 1); | |
1310 | if (scmnd == NULL) { | |
1311 | dev_err(&device->device, "Incorrect transaction ID\n"); | |
1312 | continue; | |
1313 | } | |
1314 | request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); | |
1315 | } | |
1316 | ||
ddccd952 | 1317 | storvsc_on_receive(stor_device, packet, request); |
bf5fd8ca | 1318 | continue; |
8dcf37d4 | 1319 | } |
bf5fd8ca APM |
1320 | |
1321 | memcpy(&request->vstor_packet, packet, | |
1322 | (sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta)); | |
1323 | complete(&request->wait_event); | |
ddccd952 | 1324 | } |
8dcf37d4 S |
1325 | } |
1326 | ||
dac58241 S |
1327 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
1328 | bool is_fc) | |
8dcf37d4 S |
1329 | { |
1330 | struct vmstorage_channel_properties props; | |
1331 | int ret; | |
1332 | ||
1333 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1334 | ||
adae1e93 | 1335 | device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
bf5fd8ca | 1336 | device->channel->next_request_id_callback = storvsc_next_request_id; |
453de21c | 1337 | |
8dcf37d4 S |
1338 | ret = vmbus_open(device->channel, |
1339 | ring_size, | |
1340 | ring_size, | |
1341 | (void *)&props, | |
1342 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1343 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1344 | |
1345 | if (ret != 0) | |
1346 | return ret; | |
1347 | ||
dac58241 | 1348 | ret = storvsc_channel_init(device, is_fc); |
8dcf37d4 S |
1349 | |
1350 | return ret; | |
1351 | } | |
1352 | ||
c1b3d067 | 1353 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1354 | { |
1355 | struct storvsc_device *stor_device; | |
8dcf37d4 | 1356 | |
cd654ea1 | 1357 | stor_device = hv_get_drvdata(device); |
8dcf37d4 | 1358 | |
8dcf37d4 | 1359 | stor_device->destroy = true; |
2371cd90 SH |
1360 | |
1361 | /* Make sure flag is set before waiting */ | |
1362 | wmb(); | |
8dcf37d4 S |
1363 | |
1364 | /* | |
1365 | * At this point, all outbound traffic should be disable. We | |
1366 | * only allow inbound traffic (responses) to proceed so that | |
1367 | * outstanding requests can be completed. | |
1368 | */ | |
1369 | ||
1370 | storvsc_wait_to_drain(stor_device); | |
1371 | ||
1372 | /* | |
1373 | * Since we have already drained, we don't need to busy wait | |
1374 | * as was done in final_release_stor_device() | |
1375 | * Note that we cannot set the ext pointer to NULL until | |
1376 | * we have drained - to drain the outgoing packets, we need to | |
1377 | * allow incoming packets. | |
1378 | */ | |
cd654ea1 | 1379 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1380 | |
1381 | /* Close the channel */ | |
1382 | vmbus_close(device->channel); | |
1383 | ||
d86adf48 | 1384 | kfree(stor_device->stor_chns); |
8dcf37d4 S |
1385 | kfree(stor_device); |
1386 | return 0; | |
1387 | } | |
1388 | ||
d86adf48 S |
1389 | static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
1390 | u16 q_num) | |
1391 | { | |
1392 | u16 slot = 0; | |
1393 | u16 hash_qnum; | |
1b25a8c4 | 1394 | const struct cpumask *node_mask; |
d86adf48 S |
1395 | int num_channels, tgt_cpu; |
1396 | ||
7769e18c APM |
1397 | if (stor_device->num_sc == 0) { |
1398 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1399 | return stor_device->device->channel; |
7769e18c | 1400 | } |
d86adf48 S |
1401 | |
1402 | /* | |
1403 | * Our channel array is sparsley populated and we | |
1404 | * initiated I/O on a processor/hw-q that does not | |
1405 | * currently have a designated channel. Fix this. | |
1406 | * The strategy is simple: | |
1407 | * I. Ensure NUMA locality | |
1408 | * II. Distribute evenly (best effort) | |
d86adf48 S |
1409 | */ |
1410 | ||
1b25a8c4 | 1411 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
d86adf48 | 1412 | |
1b25a8c4 MK |
1413 | num_channels = 0; |
1414 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { | |
1415 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1416 | num_channels++; | |
1417 | } | |
7769e18c APM |
1418 | if (num_channels == 0) { |
1419 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1420 | return stor_device->device->channel; |
7769e18c | 1421 | } |
d86adf48 S |
1422 | |
1423 | hash_qnum = q_num; | |
1424 | while (hash_qnum >= num_channels) | |
1425 | hash_qnum -= num_channels; | |
1426 | ||
1b25a8c4 MK |
1427 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1428 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1429 | continue; | |
d86adf48 S |
1430 | if (slot == hash_qnum) |
1431 | break; | |
1432 | slot++; | |
1433 | } | |
1434 | ||
1435 | stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; | |
1436 | ||
1437 | return stor_device->stor_chns[q_num]; | |
1438 | } | |
1439 | ||
1440 | ||
c1b3d067 | 1441 | static int storvsc_do_io(struct hv_device *device, |
d86adf48 | 1442 | struct storvsc_cmd_request *request, u16 q_num) |
8dcf37d4 S |
1443 | { |
1444 | struct storvsc_device *stor_device; | |
1445 | struct vstor_packet *vstor_packet; | |
2217a47d | 1446 | struct vmbus_channel *outgoing_channel, *channel; |
7769e18c | 1447 | unsigned long flags; |
8dcf37d4 | 1448 | int ret = 0; |
1b25a8c4 | 1449 | const struct cpumask *node_mask; |
d86adf48 | 1450 | int tgt_cpu; |
8dcf37d4 S |
1451 | |
1452 | vstor_packet = &request->vstor_packet; | |
1453 | stor_device = get_out_stor_device(device); | |
1454 | ||
1455 | if (!stor_device) | |
1456 | return -ENODEV; | |
1457 | ||
1458 | ||
1459 | request->device = device; | |
6f94d5de | 1460 | /* |
7769e18c | 1461 | * Select an appropriate channel to send the request out. |
6f94d5de | 1462 | */ |
7769e18c APM |
1463 | /* See storvsc_change_target_cpu(). */ |
1464 | outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); | |
1465 | if (outgoing_channel != NULL) { | |
2217a47d | 1466 | if (outgoing_channel->target_cpu == q_num) { |
d86adf48 S |
1467 | /* |
1468 | * Ideally, we want to pick a different channel if | |
1469 | * available on the same NUMA node. | |
1470 | */ | |
1b25a8c4 MK |
1471 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
1472 | for_each_cpu_wrap(tgt_cpu, | |
1473 | &stor_device->alloced_cpus, q_num + 1) { | |
1474 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1475 | continue; | |
2217a47d LL |
1476 | if (tgt_cpu == q_num) |
1477 | continue; | |
7769e18c APM |
1478 | channel = READ_ONCE( |
1479 | stor_device->stor_chns[tgt_cpu]); | |
1480 | if (channel == NULL) | |
1481 | continue; | |
2217a47d LL |
1482 | if (hv_get_avail_to_write_percent( |
1483 | &channel->outbound) | |
1484 | > ring_avail_percent_lowater) { | |
1485 | outgoing_channel = channel; | |
1486 | goto found_channel; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * All the other channels on the same NUMA node are | |
1492 | * busy. Try to use the channel on the current CPU | |
1493 | */ | |
1494 | if (hv_get_avail_to_write_percent( | |
1495 | &outgoing_channel->outbound) | |
1496 | > ring_avail_percent_lowater) | |
1497 | goto found_channel; | |
1498 | ||
1499 | /* | |
1500 | * If we reach here, all the channels on the current | |
1501 | * NUMA node are busy. Try to find a channel in | |
1502 | * other NUMA nodes | |
1503 | */ | |
1b25a8c4 MK |
1504 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1505 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1506 | continue; | |
7769e18c APM |
1507 | channel = READ_ONCE( |
1508 | stor_device->stor_chns[tgt_cpu]); | |
1509 | if (channel == NULL) | |
1510 | continue; | |
2217a47d LL |
1511 | if (hv_get_avail_to_write_percent( |
1512 | &channel->outbound) | |
1513 | > ring_avail_percent_lowater) { | |
1514 | outgoing_channel = channel; | |
1515 | goto found_channel; | |
d86adf48 S |
1516 | } |
1517 | } | |
1518 | } | |
1519 | } else { | |
21d2052c | 1520 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
1521 | outgoing_channel = stor_device->stor_chns[q_num]; |
1522 | if (outgoing_channel != NULL) { | |
21d2052c | 1523 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
1524 | goto found_channel; |
1525 | } | |
d86adf48 | 1526 | outgoing_channel = get_og_chn(stor_device, q_num); |
21d2052c | 1527 | spin_unlock_irqrestore(&stor_device->lock, flags); |
d86adf48 | 1528 | } |
8dcf37d4 | 1529 | |
2217a47d | 1530 | found_channel: |
8dcf37d4 S |
1531 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
1532 | ||
8b612fa2 | 1533 | vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
244808e0 | 1534 | stor_device->vmscsi_size_delta); |
8dcf37d4 S |
1535 | |
1536 | ||
8b612fa2 | 1537 | vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
8dcf37d4 S |
1538 | |
1539 | ||
1540 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1541 | request->payload->range.len; |
8dcf37d4 S |
1542 | |
1543 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1544 | ||
be0cf6ca S |
1545 | if (request->payload->range.len) { |
1546 | ||
1547 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1548 | request->payload, request->payload_sz, | |
8dcf37d4 | 1549 | vstor_packet, |
8b612fa2 | 1550 | (sizeof(struct vstor_packet) - |
244808e0 | 1551 | stor_device->vmscsi_size_delta), |
8dcf37d4 S |
1552 | (unsigned long)request); |
1553 | } else { | |
0147dabc | 1554 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
8b612fa2 | 1555 | (sizeof(struct vstor_packet) - |
244808e0 | 1556 | stor_device->vmscsi_size_delta), |
8dcf37d4 S |
1557 | (unsigned long)request, |
1558 | VM_PKT_DATA_INBAND, | |
1559 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1560 | } | |
1561 | ||
1562 | if (ret != 0) | |
1563 | return ret; | |
1564 | ||
1565 | atomic_inc(&stor_device->num_outstanding_req); | |
1566 | ||
1567 | return ret; | |
1568 | } | |
1569 | ||
f1c635b4 SH |
1570 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1571 | { | |
1572 | /* | |
1573 | * Set blist flag to permit the reading of the VPD pages even when | |
1574 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1575 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1576 | * With this flag we can correctly handle WRITE_SAME_16 issues. | |
1577 | * | |
1578 | * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but | |
1579 | * still supports REPORT LUN. | |
1580 | */ | |
1581 | sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
419f2d03 S |
1586 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1587 | { | |
893def38 S |
1588 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1589 | ||
3e8f4f40 OH |
1590 | sdevice->no_write_same = 1; |
1591 | ||
b0a93d96 S |
1592 | /* |
1593 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1594 | * if the device is a MSFT virtual device. If the host is |
1595 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1596 | */ |
1597 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1598 | switch (vmstor_proto_version) { |
1599 | case VMSTOR_PROTO_VERSION_WIN8: | |
1600 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1601 | sdevice->scsi_level = SCSI_SPC_3; |
1602 | break; | |
1603 | } | |
b95f5be0 KM |
1604 | |
1605 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1606 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1607 | } |
1608 | ||
419f2d03 S |
1609 | return 0; |
1610 | } | |
1611 | ||
62838ce2 S |
1612 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1613 | sector_t capacity, int *info) | |
1614 | { | |
5326fd5c S |
1615 | sector_t nsect = capacity; |
1616 | sector_t cylinders = nsect; | |
1617 | int heads, sectors_pt; | |
62838ce2 | 1618 | |
5326fd5c S |
1619 | /* |
1620 | * We are making up these values; let us keep it simple. | |
1621 | */ | |
1622 | heads = 0xff; | |
1623 | sectors_pt = 0x3f; /* Sectors per track */ | |
1624 | sector_div(cylinders, heads * sectors_pt); | |
1625 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1626 | cylinders = 0xffff; | |
62838ce2 S |
1627 | |
1628 | info[0] = heads; | |
5326fd5c S |
1629 | info[1] = sectors_pt; |
1630 | info[2] = (int)cylinders; | |
62838ce2 | 1631 | |
62838ce2 S |
1632 | return 0; |
1633 | } | |
aa3d789e | 1634 | |
4b270c8b | 1635 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1636 | { |
4b270c8b S |
1637 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1638 | struct hv_device *device = host_dev->dev; | |
1639 | ||
aa3d789e | 1640 | struct storvsc_device *stor_device; |
61eaffc9 | 1641 | struct storvsc_cmd_request *request; |
aa3d789e S |
1642 | struct vstor_packet *vstor_packet; |
1643 | int ret, t; | |
1644 | ||
1eaaddf9 | 1645 | stor_device = get_out_stor_device(device); |
aa3d789e | 1646 | if (!stor_device) |
a00e8224 | 1647 | return FAILED; |
aa3d789e S |
1648 | |
1649 | request = &stor_device->reset_request; | |
1650 | vstor_packet = &request->vstor_packet; | |
0a765665 | 1651 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
aa3d789e S |
1652 | |
1653 | init_completion(&request->wait_event); | |
1654 | ||
1655 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1656 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1657 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1658 | ||
1659 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
8b612fa2 | 1660 | (sizeof(struct vstor_packet) - |
244808e0 | 1661 | stor_device->vmscsi_size_delta), |
bf5fd8ca | 1662 | VMBUS_RQST_RESET, |
aa3d789e S |
1663 | VM_PKT_DATA_INBAND, |
1664 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1665 | if (ret != 0) | |
a00e8224 | 1666 | return FAILED; |
aa3d789e | 1667 | |
46d2eb6d | 1668 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1669 | if (t == 0) |
1670 | return TIMEOUT_ERROR; | |
aa3d789e | 1671 | |
aa3d789e S |
1672 | |
1673 | /* | |
1674 | * At this point, all outstanding requests in the adapter | |
1675 | * should have been flushed out and return to us | |
5c1b10ab S |
1676 | * There is a potential race here where the host may be in |
1677 | * the process of responding when we return from here. | |
1678 | * Just wait for all in-transit packets to be accounted for | |
1679 | * before we return from here. | |
aa3d789e | 1680 | */ |
5c1b10ab | 1681 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1682 | |
a00e8224 | 1683 | return SUCCESS; |
aa3d789e S |
1684 | } |
1685 | ||
56b26e69 S |
1686 | /* |
1687 | * The host guarantees to respond to each command, although I/O latencies might | |
1688 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1689 | * chance to perform EH. | |
1690 | */ | |
1691 | static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) | |
1692 | { | |
3930d730 LL |
1693 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1694 | if (scmnd->device->host->transportt == fc_transport_template) | |
1695 | return fc_eh_timed_out(scmnd); | |
1696 | #endif | |
56b26e69 S |
1697 | return BLK_EH_RESET_TIMER; |
1698 | } | |
1699 | ||
c77b63b6 | 1700 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1701 | { |
1702 | bool allowed = true; | |
1703 | u8 scsi_op = scmnd->cmnd[0]; | |
1704 | ||
1705 | switch (scsi_op) { | |
3e8f4f40 OH |
1706 | /* the host does not handle WRITE_SAME, log accident usage */ |
1707 | case WRITE_SAME: | |
c77b63b6 S |
1708 | /* |
1709 | * smartd sends this command and the host does not handle | |
1710 | * this. So, don't send it. | |
1711 | */ | |
41098f8f | 1712 | case SET_WINDOW: |
d4674859 | 1713 | set_host_byte(scmnd, DID_ERROR); |
41098f8f S |
1714 | allowed = false; |
1715 | break; | |
1716 | default: | |
1717 | break; | |
92ae4ebd OH |
1718 | } |
1719 | return allowed; | |
1720 | } | |
c5b463ae | 1721 | |
bab445e1 | 1722 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1723 | { |
1724 | int ret; | |
bab445e1 | 1725 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1726 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1727 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae S |
1728 | int i; |
1729 | struct scatterlist *sgl; | |
3d9c3dcc | 1730 | unsigned int sg_count; |
c5b463ae | 1731 | struct vmscsi_request *vm_srb; |
be0cf6ca S |
1732 | struct vmbus_packet_mpb_array *payload; |
1733 | u32 payload_sz; | |
1734 | u32 length; | |
c5b463ae | 1735 | |
2492fd7a | 1736 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1737 | /* |
1738 | * On legacy hosts filter unimplemented commands. | |
1739 | * Future hosts are expected to correctly handle | |
1740 | * unsupported commands. Furthermore, it is | |
1741 | * possible that some of the currently | |
1742 | * unsupported commands maybe supported in | |
1743 | * future versions of the host. | |
1744 | */ | |
1745 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
1746 | scmnd->scsi_done(scmnd); | |
1747 | return 0; | |
1748 | } | |
92ae4ebd | 1749 | } |
c5b463ae | 1750 | |
c5b463ae | 1751 | /* Setup the cmd request */ |
c5b463ae S |
1752 | cmd_request->cmd = scmnd; |
1753 | ||
0a765665 | 1754 | memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); |
61eaffc9 | 1755 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
8b612fa2 | 1756 | vm_srb->win8_extension.time_out_value = 60; |
c5b463ae | 1757 | |
f885fb73 | 1758 | vm_srb->win8_extension.srb_flags |= |
8cf308e1 | 1759 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae | 1760 | |
3cd6d3d9 LL |
1761 | if (scmnd->device->tagged_supported) { |
1762 | vm_srb->win8_extension.srb_flags |= | |
1763 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); | |
1764 | vm_srb->win8_extension.queue_tag = SP_UNTAGGED; | |
1765 | vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; | |
1766 | } | |
1767 | ||
c5b463ae S |
1768 | /* Build the SRB */ |
1769 | switch (scmnd->sc_data_direction) { | |
1770 | case DMA_TO_DEVICE: | |
1771 | vm_srb->data_in = WRITE_TYPE; | |
8b612fa2 | 1772 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1773 | break; |
1774 | case DMA_FROM_DEVICE: | |
1775 | vm_srb->data_in = READ_TYPE; | |
8b612fa2 | 1776 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1777 | break; |
cb1cf080 | 1778 | case DMA_NONE: |
c5b463ae | 1779 | vm_srb->data_in = UNKNOWN_TYPE; |
dc45708c | 1780 | vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1781 | break; |
cb1cf080 VK |
1782 | default: |
1783 | /* | |
1784 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1785 | * supposed to see here. | |
1786 | */ | |
1787 | WARN(1, "Unexpected data direction: %d\n", | |
1788 | scmnd->sc_data_direction); | |
1789 | return -EINVAL; | |
c5b463ae S |
1790 | } |
1791 | ||
c5b463ae | 1792 | |
c5b463ae S |
1793 | vm_srb->port_number = host_dev->port; |
1794 | vm_srb->path_id = scmnd->device->channel; | |
1795 | vm_srb->target_id = scmnd->device->id; | |
1796 | vm_srb->lun = scmnd->device->lun; | |
1797 | ||
c5b463ae S |
1798 | vm_srb->cdb_length = scmnd->cmd_len; |
1799 | ||
1800 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1801 | ||
be0cf6ca S |
1802 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
1803 | sg_count = scsi_sg_count(scmnd); | |
c5b463ae | 1804 | |
be0cf6ca S |
1805 | length = scsi_bufflen(scmnd); |
1806 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
1807 | payload_sz = sizeof(cmd_request->mpb); | |
1808 | ||
1809 | if (sg_count) { | |
3d9c3dcc MK |
1810 | unsigned int hvpgoff, hvpfns_to_add; |
1811 | unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset); | |
8f437105 BF |
1812 | unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); |
1813 | u64 hvpfn; | |
be0cf6ca | 1814 | |
8f437105 BF |
1815 | if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { |
1816 | ||
1817 | payload_sz = (hvpg_count * sizeof(u64) + | |
be0cf6ca | 1818 | sizeof(struct vmbus_packet_mpb_array)); |
b0120d99 | 1819 | payload = kzalloc(payload_sz, GFP_ATOMIC); |
81988a0e VK |
1820 | if (!payload) |
1821 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1822 | } |
1823 | ||
1824 | payload->range.len = length; | |
8f437105 | 1825 | payload->range.offset = offset_in_hvpg; |
be0cf6ca | 1826 | |
3d9c3dcc MK |
1827 | |
1828 | for (i = 0; sgl != NULL; sgl = sg_next(sgl)) { | |
8f437105 | 1829 | /* |
3d9c3dcc MK |
1830 | * Init values for the current sgl entry. hvpgoff |
1831 | * and hvpfns_to_add are in units of Hyper-V size | |
1832 | * pages. Handling the PAGE_SIZE != HV_HYP_PAGE_SIZE | |
1833 | * case also handles values of sgl->offset that are | |
1834 | * larger than PAGE_SIZE. Such offsets are handled | |
1835 | * even on other than the first sgl entry, provided | |
1836 | * they are a multiple of PAGE_SIZE. | |
8f437105 | 1837 | */ |
3d9c3dcc MK |
1838 | hvpgoff = HVPFN_DOWN(sgl->offset); |
1839 | hvpfn = page_to_hvpfn(sg_page(sgl)) + hvpgoff; | |
1840 | hvpfns_to_add = HVPFN_UP(sgl->offset + sgl->length) - | |
1841 | hvpgoff; | |
8f437105 BF |
1842 | |
1843 | /* | |
3d9c3dcc MK |
1844 | * Fill the next portion of the PFN array with |
1845 | * sequential Hyper-V PFNs for the continguous physical | |
1846 | * memory described by the sgl entry. The end of the | |
1847 | * last sgl should be reached at the same time that | |
1848 | * the PFN array is filled. | |
8f437105 | 1849 | */ |
3d9c3dcc MK |
1850 | while (hvpfns_to_add--) |
1851 | payload->range.pfn_array[i++] = hvpfn++; | |
aaced993 | 1852 | } |
c5b463ae S |
1853 | } |
1854 | ||
be0cf6ca S |
1855 | cmd_request->payload = payload; |
1856 | cmd_request->payload_sz = payload_sz; | |
1857 | ||
c5b463ae | 1858 | /* Invokes the vsc to start an IO */ |
d86adf48 S |
1859 | ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
1860 | put_cpu(); | |
636f0fd1 | 1861 | |
d2598f01 | 1862 | if (ret == -EAGAIN) { |
0208eeaa LL |
1863 | if (payload_sz > sizeof(cmd_request->mpb)) |
1864 | kfree(payload); | |
c5b463ae | 1865 | /* no more space */ |
ead3700d | 1866 | return SCSI_MLQUEUE_DEVICE_BUSY; |
c5b463ae S |
1867 | } |
1868 | ||
c77b63b6 | 1869 | return 0; |
c5b463ae S |
1870 | } |
1871 | ||
bef4a34a | 1872 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1873 | .module = THIS_MODULE, |
1874 | .name = "storvsc_host_t", | |
ead3700d | 1875 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1876 | .bios_param = storvsc_get_chs, |
1877 | .queuecommand = storvsc_queuecommand, | |
1878 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1879 | .proc_name = "storvsc_host", |
56b26e69 | 1880 | .eh_timed_out = storvsc_eh_timed_out, |
f1c635b4 | 1881 | .slave_alloc = storvsc_device_alloc, |
ff568d3a | 1882 | .slave_configure = storvsc_device_configure, |
cabe92a5 | 1883 | .cmd_per_lun = 2048, |
ff568d3a | 1884 | .this_id = -1, |
83eed459 CH |
1885 | /* Ensure there are no gaps in presented sgls */ |
1886 | .virt_boundary_mask = PAGE_SIZE-1, | |
54b2b50c | 1887 | .no_write_same = 1, |
f64dad26 | 1888 | .track_queue_depth = 1, |
adfbd028 | 1889 | .change_queue_depth = storvsc_change_queue_depth, |
bef4a34a HJ |
1890 | }; |
1891 | ||
ef52a81b S |
1892 | enum { |
1893 | SCSI_GUID, | |
1894 | IDE_GUID, | |
bde6d0f9 | 1895 | SFC_GUID, |
ef52a81b S |
1896 | }; |
1897 | ||
d847b5fe | 1898 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1899 | /* SCSI guid */ |
35c3bc20 S |
1900 | { HV_SCSI_GUID, |
1901 | .driver_data = SCSI_GUID | |
1902 | }, | |
21e37742 | 1903 | /* IDE guid */ |
35c3bc20 S |
1904 | { HV_IDE_GUID, |
1905 | .driver_data = IDE_GUID | |
1906 | }, | |
bde6d0f9 S |
1907 | /* Fibre Channel GUID */ |
1908 | { | |
1909 | HV_SYNTHFC_GUID, | |
1910 | .driver_data = SFC_GUID | |
1911 | }, | |
c45cf2d4 | 1912 | { }, |
d847b5fe | 1913 | }; |
bef4a34a | 1914 | |
d847b5fe | 1915 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1916 | |
56fb1058 DC |
1917 | static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; |
1918 | ||
1919 | static bool hv_dev_is_fc(struct hv_device *hv_dev) | |
1920 | { | |
1921 | return guid_equal(&fc_guid.guid, &hv_dev->dev_type); | |
1922 | } | |
1923 | ||
84946899 S |
1924 | static int storvsc_probe(struct hv_device *device, |
1925 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1926 | { |
ff568d3a | 1927 | int ret; |
f458aada | 1928 | int num_cpus = num_online_cpus(); |
a81a38cc | 1929 | int num_present_cpus = num_present_cpus(); |
bef4a34a | 1930 | struct Scsi_Host *host; |
795b613d | 1931 | struct hv_host_device *host_dev; |
ef52a81b | 1932 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
dac58241 | 1933 | bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
bd1f5d6a | 1934 | int target = 0; |
6e4198ce | 1935 | struct storvsc_device *stor_device; |
0fb8db29 S |
1936 | int max_luns_per_target; |
1937 | int max_targets; | |
1938 | int max_channels; | |
f458aada | 1939 | int max_sub_channels = 0; |
bd1f5d6a | 1940 | |
8b612fa2 S |
1941 | /* |
1942 | * Based on the windows host we are running on, | |
1943 | * set state to properly communicate with the host. | |
1944 | */ | |
1945 | ||
6ee5c615 | 1946 | if (vmbus_proto_version < VERSION_WIN8) { |
0fb8db29 S |
1947 | max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
1948 | max_targets = STORVSC_IDE_MAX_TARGETS; | |
1949 | max_channels = STORVSC_IDE_MAX_CHANNELS; | |
6ee5c615 | 1950 | } else { |
0fb8db29 S |
1951 | max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
1952 | max_targets = STORVSC_MAX_TARGETS; | |
1953 | max_channels = STORVSC_MAX_CHANNELS; | |
f458aada | 1954 | /* |
f286299c LL |
1955 | * On Windows8 and above, we support sub-channels for storage |
1956 | * on SCSI and FC controllers. | |
f458aada S |
1957 | * The number of sub-channels offerred is based on the number of |
1958 | * VCPUs in the guest. | |
1959 | */ | |
f286299c LL |
1960 | if (!dev_is_ide) |
1961 | max_sub_channels = | |
1962 | (num_cpus - 1) / storvsc_vcpus_per_sub_channel; | |
8b612fa2 S |
1963 | } |
1964 | ||
2217a47d LL |
1965 | scsi_driver.can_queue = max_outstanding_req_per_channel * |
1966 | (max_sub_channels + 1) * | |
1967 | (100 - ring_avail_percent_lowater) / 100; | |
f458aada | 1968 | |
ff568d3a | 1969 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1970 | sizeof(struct hv_host_device)); |
f8feed06 | 1971 | if (!host) |
bef4a34a | 1972 | return -ENOMEM; |
bef4a34a | 1973 | |
7f33f30a | 1974 | host_dev = shost_priv(host); |
795b613d | 1975 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1976 | |
795b613d | 1977 | host_dev->port = host->host_no; |
97c15296 | 1978 | host_dev->dev = device; |
c58cc70f | 1979 | host_dev->host = host; |
bef4a34a | 1980 | |
4e03e697 | 1981 | |
a13d35ab | 1982 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1983 | if (!stor_device) { |
225ce6ea | 1984 | ret = -ENOMEM; |
ce3e301c | 1985 | goto err_out0; |
6e4198ce | 1986 | } |
9efd21e1 | 1987 | |
a13d35ab S |
1988 | stor_device->destroy = false; |
1989 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1990 | stor_device->device = device; | |
cd654ea1 | 1991 | stor_device->host = host; |
244808e0 | 1992 | stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); |
21d2052c | 1993 | spin_lock_init(&stor_device->lock); |
cd654ea1 | 1994 | hv_set_drvdata(device, stor_device); |
a13d35ab | 1995 | |
6e4198ce | 1996 | stor_device->port_number = host->host_no; |
dac58241 | 1997 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
225ce6ea | 1998 | if (ret) |
ce3e301c | 1999 | goto err_out1; |
bef4a34a | 2000 | |
6e4198ce S |
2001 | host_dev->path = stor_device->path_id; |
2002 | host_dev->target = stor_device->target_id; | |
bef4a34a | 2003 | |
4cd83ecd S |
2004 | switch (dev_id->driver_data) { |
2005 | case SFC_GUID: | |
2006 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
2007 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
2008 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
dac58241 S |
2009 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2010 | host->transportt = fc_transport_template; | |
2011 | #endif | |
4cd83ecd S |
2012 | break; |
2013 | ||
2014 | case SCSI_GUID: | |
0fb8db29 S |
2015 | host->max_lun = max_luns_per_target; |
2016 | host->max_id = max_targets; | |
2017 | host->max_channel = max_channels - 1; | |
4cd83ecd S |
2018 | break; |
2019 | ||
2020 | default: | |
2021 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
2022 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
2023 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
2024 | break; | |
2025 | } | |
cf55f4a8 MS |
2026 | /* max cmd length */ |
2027 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 2028 | |
be0cf6ca S |
2029 | /* |
2030 | * set the table size based on the info we got | |
2031 | * from the host. | |
2032 | */ | |
2033 | host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); | |
d86adf48 | 2034 | /* |
7b571c19 | 2035 | * For non-IDE disks, the host supports multiple channels. |
d86adf48 S |
2036 | * Set the number of HW queues we are supporting. |
2037 | */ | |
a81a38cc MPM |
2038 | if (!dev_is_ide) { |
2039 | if (storvsc_max_hw_queues > num_present_cpus) { | |
2040 | storvsc_max_hw_queues = 0; | |
2041 | storvsc_log(device, STORVSC_LOGGING_WARN, | |
2042 | "Resetting invalid storvsc_max_hw_queues value to default.\n"); | |
2043 | } | |
2044 | if (storvsc_max_hw_queues) | |
2045 | host->nr_hw_queues = storvsc_max_hw_queues; | |
2046 | else | |
2047 | host->nr_hw_queues = num_present_cpus; | |
2048 | } | |
be0cf6ca | 2049 | |
436ad941 CA |
2050 | /* |
2051 | * Set the error handler work queue. | |
2052 | */ | |
2053 | host_dev->handle_error_wq = | |
2054 | alloc_ordered_workqueue("storvsc_error_wq_%d", | |
2055 | WQ_MEM_RECLAIM, | |
2056 | host->host_no); | |
6112ff4e JX |
2057 | if (!host_dev->handle_error_wq) { |
2058 | ret = -ENOMEM; | |
436ad941 | 2059 | goto err_out2; |
6112ff4e | 2060 | } |
c58cc70f | 2061 | INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); |
454f18a9 | 2062 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 2063 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 2064 | if (ret != 0) |
436ad941 | 2065 | goto err_out3; |
bef4a34a | 2066 | |
bd1f5d6a S |
2067 | if (!dev_is_ide) { |
2068 | scsi_scan_host(host); | |
59d22950 S |
2069 | } else { |
2070 | target = (device->dev_instance.b[5] << 8 | | |
2071 | device->dev_instance.b[4]); | |
2072 | ret = scsi_add_device(host, 0, target, 0); | |
daf0cd44 | 2073 | if (ret) |
436ad941 | 2074 | goto err_out4; |
bef4a34a | 2075 | } |
dac58241 S |
2076 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2077 | if (host->transportt == fc_transport_template) { | |
daf0cd44 CA |
2078 | struct fc_rport_identifiers ids = { |
2079 | .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, | |
2080 | }; | |
2081 | ||
dac58241 S |
2082 | fc_host_node_name(host) = stor_device->node_name; |
2083 | fc_host_port_name(host) = stor_device->port_name; | |
daf0cd44 | 2084 | stor_device->rport = fc_remote_port_add(host, 0, &ids); |
ca8dc694 DC |
2085 | if (!stor_device->rport) { |
2086 | ret = -ENOMEM; | |
436ad941 | 2087 | goto err_out4; |
ca8dc694 | 2088 | } |
dac58241 S |
2089 | } |
2090 | #endif | |
bd1f5d6a | 2091 | return 0; |
bef4a34a | 2092 | |
436ad941 | 2093 | err_out4: |
daf0cd44 CA |
2094 | scsi_remove_host(host); |
2095 | ||
436ad941 CA |
2096 | err_out3: |
2097 | destroy_workqueue(host_dev->handle_error_wq); | |
2098 | ||
ce3e301c | 2099 | err_out2: |
225ce6ea S |
2100 | /* |
2101 | * Once we have connected with the host, we would need to | |
2102 | * to invoke storvsc_dev_remove() to rollback this state and | |
2103 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 2104 | * err_out1 label. |
225ce6ea | 2105 | */ |
bd1f5d6a | 2106 | storvsc_dev_remove(device); |
ce3e301c | 2107 | goto err_out0; |
225ce6ea S |
2108 | |
2109 | err_out1: | |
d86adf48 | 2110 | kfree(stor_device->stor_chns); |
ce3e301c | 2111 | kfree(stor_device); |
225ce6ea S |
2112 | |
2113 | err_out0: | |
bd1f5d6a | 2114 | scsi_host_put(host); |
225ce6ea | 2115 | return ret; |
bef4a34a HJ |
2116 | } |
2117 | ||
adfbd028 BB |
2118 | /* Change a scsi target's queue depth */ |
2119 | static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) | |
2120 | { | |
2121 | if (queue_depth > scsi_driver.can_queue) | |
2122 | queue_depth = scsi_driver.can_queue; | |
2123 | ||
2124 | return scsi_change_queue_depth(sdev, queue_depth); | |
2125 | } | |
2126 | ||
ddcbf65e S |
2127 | static int storvsc_remove(struct hv_device *dev) |
2128 | { | |
2129 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
2130 | struct Scsi_Host *host = stor_device->host; | |
436ad941 | 2131 | struct hv_host_device *host_dev = shost_priv(host); |
ddcbf65e | 2132 | |
dac58241 | 2133 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
daf0cd44 CA |
2134 | if (host->transportt == fc_transport_template) { |
2135 | fc_remote_port_delete(stor_device->rport); | |
dac58241 | 2136 | fc_remove_host(host); |
daf0cd44 | 2137 | } |
dac58241 | 2138 | #endif |
436ad941 | 2139 | destroy_workqueue(host_dev->handle_error_wq); |
ddcbf65e S |
2140 | scsi_remove_host(host); |
2141 | storvsc_dev_remove(dev); | |
2142 | scsi_host_put(host); | |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
56fb1058 DC |
2147 | static int storvsc_suspend(struct hv_device *hv_dev) |
2148 | { | |
2149 | struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); | |
2150 | struct Scsi_Host *host = stor_device->host; | |
2151 | struct hv_host_device *host_dev = shost_priv(host); | |
2152 | ||
2153 | storvsc_wait_to_drain(stor_device); | |
2154 | ||
2155 | drain_workqueue(host_dev->handle_error_wq); | |
2156 | ||
2157 | vmbus_close(hv_dev->channel); | |
2158 | ||
56fb1058 DC |
2159 | kfree(stor_device->stor_chns); |
2160 | stor_device->stor_chns = NULL; | |
2161 | ||
2162 | cpumask_clear(&stor_device->alloced_cpus); | |
2163 | ||
2164 | return 0; | |
2165 | } | |
2166 | ||
2167 | static int storvsc_resume(struct hv_device *hv_dev) | |
2168 | { | |
2169 | int ret; | |
2170 | ||
2171 | ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, | |
2172 | hv_dev_is_fc(hv_dev)); | |
2173 | return ret; | |
2174 | } | |
2175 | ||
40bf63ed | 2176 | static struct hv_driver storvsc_drv = { |
fafb0efc | 2177 | .name = KBUILD_MODNAME, |
d847b5fe | 2178 | .id_table = id_table, |
40bf63ed S |
2179 | .probe = storvsc_probe, |
2180 | .remove = storvsc_remove, | |
56fb1058 DC |
2181 | .suspend = storvsc_suspend, |
2182 | .resume = storvsc_resume, | |
af0a5646 AV |
2183 | .driver = { |
2184 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
2185 | }, | |
39ae6fae | 2186 | }; |
7bd05b91 | 2187 | |
dac58241 S |
2188 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2189 | static struct fc_function_template fc_transport_functions = { | |
2190 | .show_host_node_name = 1, | |
2191 | .show_host_port_name = 1, | |
2192 | }; | |
2193 | #endif | |
2194 | ||
d9bbae83 | 2195 | static int __init storvsc_drv_init(void) |
f5c78872 | 2196 | { |
dac58241 | 2197 | int ret; |
01415ab3 S |
2198 | |
2199 | /* | |
2200 | * Divide the ring buffer data size (which is 1 page less | |
2201 | * than the ring buffer size since that page is reserved for | |
2202 | * the ring buffer indices) by the max request size (which is | |
2203 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
ab548fd2 APM |
2204 | * |
2205 | * The computation underestimates max_outstanding_req_per_channel | |
2206 | * for Win7 and older hosts because it does not take into account | |
2207 | * the vmscsi_size_delta correction to the max request size. | |
01415ab3 | 2208 | */ |
01415ab3 | 2209 | max_outstanding_req_per_channel = |
768fa219 GKH |
2210 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
2211 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
ab548fd2 | 2212 | sizeof(struct vstor_packet) + sizeof(u64), |
768fa219 | 2213 | sizeof(u64))); |
f5c78872 | 2214 | |
dac58241 S |
2215 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2216 | fc_transport_template = fc_attach_transport(&fc_transport_functions); | |
2217 | if (!fc_transport_template) | |
2218 | return -ENODEV; | |
2219 | #endif | |
2220 | ||
2221 | ret = vmbus_driver_register(&storvsc_drv); | |
2222 | ||
2223 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
2224 | if (ret) | |
2225 | fc_release_transport(fc_transport_template); | |
2226 | #endif | |
2227 | ||
2228 | return ret; | |
f5c78872 S |
2229 | } |
2230 | ||
c63ba9e1 | 2231 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 2232 | { |
768fa219 | 2233 | vmbus_driver_unregister(&storvsc_drv); |
dac58241 S |
2234 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2235 | fc_release_transport(fc_transport_template); | |
2236 | #endif | |
f5c78872 S |
2237 | } |
2238 | ||
ff568d3a | 2239 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 2240 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 2241 | module_init(storvsc_drv_init); |
c63ba9e1 | 2242 | module_exit(storvsc_drv_exit); |