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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> |
743b237c TL |
24 | #include <linux/dma-mapping.h> |
25 | ||
bef4a34a HJ |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_cmnd.h> | |
28 | #include <scsi/scsi_host.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 33 | #include <scsi/scsi_dbg.h> |
dac58241 | 34 | #include <scsi/scsi_transport_fc.h> |
d791a8c6 | 35 | #include <scsi/scsi_transport.h> |
3f335ea2 | 36 | |
09f0355f | 37 | /* |
af9584b8 S |
38 | * All wire protocol details (storage protocol between the guest and the host) |
39 | * are consolidated here. | |
40 | * | |
41 | * Begin protocol definitions. | |
09f0355f S |
42 | */ |
43 | ||
09f0355f S |
44 | /* |
45 | * Version history: | |
46 | * V1 Beta: 0.1 | |
47 | * V1 RC < 2008/1/31: 1.0 | |
48 | * V1 RC > 2008/1/31: 2.0 | |
49 | * Win7: 4.2 | |
8b612fa2 | 50 | * Win8: 5.1 |
1a363108 KM |
51 | * Win8.1: 6.0 |
52 | * Win10: 6.2 | |
09f0355f S |
53 | */ |
54 | ||
2492fd7a KM |
55 | #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
56 | (((MINOR_) & 0xff))) | |
1a363108 | 57 | #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
2492fd7a KM |
58 | #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
59 | #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) | |
1a363108 KM |
60 | #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
61 | #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) | |
f0d79fe9 | 62 | |
78c65f0f SS |
63 | /* channel callback timeout in ms */ |
64 | #define CALLBACK_TIMEOUT 2 | |
65 | ||
f0d79fe9 S |
66 | /* Packet structure describing virtual storage requests. */ |
67 | enum vstor_packet_operation { | |
68 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
69 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
70 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
71 | VSTOR_OPERATION_RESET_LUN = 4, | |
72 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
73 | VSTOR_OPERATION_RESET_BUS = 6, | |
74 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
75 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
76 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
77 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 | 78 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
8b612fa2 S |
79 | VSTOR_OPERATION_FCHBA_DATA = 12, |
80 | VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, | |
81 | VSTOR_OPERATION_MAXIMUM = 13 | |
82 | }; | |
83 | ||
84 | /* | |
85 | * WWN packet for Fibre Channel HBA | |
86 | */ | |
87 | ||
88 | struct hv_fc_wwn_packet { | |
83d1e8b9 S |
89 | u8 primary_active; |
90 | u8 reserved1[3]; | |
8b612fa2 S |
91 | u8 primary_port_wwn[8]; |
92 | u8 primary_node_wwn[8]; | |
93 | u8 secondary_port_wwn[8]; | |
94 | u8 secondary_node_wwn[8]; | |
f0d79fe9 S |
95 | }; |
96 | ||
8b612fa2 S |
97 | |
98 | ||
99 | /* | |
100 | * SRB Flag Bits | |
101 | */ | |
102 | ||
103 | #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 | |
104 | #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 | |
105 | #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 | |
106 | #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 | |
107 | #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 | |
108 | #define SRB_FLAGS_DATA_IN 0x00000040 | |
109 | #define SRB_FLAGS_DATA_OUT 0x00000080 | |
110 | #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 | |
111 | #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) | |
112 | #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 | |
113 | #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 | |
114 | #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 | |
115 | ||
116 | /* | |
117 | * This flag indicates the request is part of the workflow for processing a D3. | |
118 | */ | |
119 | #define SRB_FLAGS_D3_PROCESSING 0x00000800 | |
120 | #define SRB_FLAGS_IS_ACTIVE 0x00010000 | |
121 | #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 | |
122 | #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 | |
123 | #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 | |
124 | #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 | |
125 | #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 | |
126 | #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 | |
127 | #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 | |
128 | #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 | |
129 | #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 | |
130 | ||
3cd6d3d9 LL |
131 | #define SP_UNTAGGED ((unsigned char) ~0) |
132 | #define SRB_SIMPLE_TAG_REQUEST 0x20 | |
8b612fa2 | 133 | |
f0d79fe9 S |
134 | /* |
135 | * Platform neutral description of a scsi request - | |
136 | * this remains the same across the write regardless of 32/64 bit | |
137 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
138 | */ | |
6b2f9495 | 139 | #define STORVSC_MAX_CMD_LEN 0x10 |
8b612fa2 | 140 | |
86c8fb4d | 141 | /* Sense buffer size is the same for all versions since Windows 8 */ |
8b612fa2 | 142 | #define STORVSC_SENSE_BUFFER_SIZE 0x14 |
6b2f9495 | 143 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
f0d79fe9 | 144 | |
8b612fa2 | 145 | /* |
cb11fead KM |
146 | * The storage protocol version is determined during the |
147 | * initial exchange with the host. It will indicate which | |
148 | * storage functionality is available in the host. | |
149 | */ | |
2492fd7a | 150 | static int vmstor_proto_version; |
8b612fa2 | 151 | |
f8aea701 LL |
152 | #define STORVSC_LOGGING_NONE 0 |
153 | #define STORVSC_LOGGING_ERROR 1 | |
154 | #define STORVSC_LOGGING_WARN 2 | |
155 | ||
156 | static int logging_level = STORVSC_LOGGING_ERROR; | |
157 | module_param(logging_level, int, S_IRUGO|S_IWUSR); | |
158 | MODULE_PARM_DESC(logging_level, | |
159 | "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); | |
160 | ||
161 | static inline bool do_logging(int level) | |
162 | { | |
163 | return logging_level >= level; | |
164 | } | |
165 | ||
166 | #define storvsc_log(dev, level, fmt, ...) \ | |
167 | do { \ | |
168 | if (do_logging(level)) \ | |
169 | dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ | |
170 | } while (0) | |
171 | ||
f0d79fe9 | 172 | struct vmscsi_request { |
c649114a S |
173 | u16 length; |
174 | u8 srb_status; | |
175 | u8 scsi_status; | |
f0d79fe9 | 176 | |
c649114a S |
177 | u8 port_number; |
178 | u8 path_id; | |
179 | u8 target_id; | |
180 | u8 lun; | |
f0d79fe9 | 181 | |
c649114a S |
182 | u8 cdb_length; |
183 | u8 sense_info_length; | |
184 | u8 data_in; | |
185 | u8 reserved; | |
f0d79fe9 | 186 | |
c649114a | 187 | u32 data_transfer_length; |
f0d79fe9 S |
188 | |
189 | union { | |
6b2f9495 S |
190 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
191 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
192 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 | 193 | }; |
8b612fa2 S |
194 | /* |
195 | * The following was added in win8. | |
196 | */ | |
86c8fb4d SS |
197 | u16 reserve; |
198 | u8 queue_tag; | |
199 | u8 queue_action; | |
200 | u32 srb_flags; | |
201 | u32 time_out_value; | |
202 | u32 queue_sort_ey; | |
8b612fa2 | 203 | |
f0d79fe9 S |
204 | } __attribute((packed)); |
205 | ||
1a363108 | 206 | /* |
86c8fb4d | 207 | * The list of windows version in order of preference. |
1a363108 | 208 | */ |
1a363108 | 209 | |
86c8fb4d | 210 | static const int protocol_version[] = { |
1a363108 | 211 | VMSTOR_PROTO_VERSION_WIN10, |
1a363108 | 212 | VMSTOR_PROTO_VERSION_WIN8_1, |
1a363108 | 213 | VMSTOR_PROTO_VERSION_WIN8, |
1a363108 KM |
214 | }; |
215 | ||
216 | ||
f0d79fe9 | 217 | /* |
183b8021 | 218 | * This structure is sent during the initialization phase to get the different |
f0d79fe9 S |
219 | * properties of the channel. |
220 | */ | |
8b612fa2 S |
221 | |
222 | #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 | |
223 | ||
f0d79fe9 | 224 | struct vmstorage_channel_properties { |
8b612fa2 S |
225 | u32 reserved; |
226 | u16 max_channel_cnt; | |
227 | u16 reserved1; | |
f0d79fe9 | 228 | |
8b612fa2 | 229 | u32 flags; |
c649114a | 230 | u32 max_transfer_bytes; |
f0d79fe9 | 231 | |
8b612fa2 | 232 | u64 reserved2; |
f0d79fe9 S |
233 | } __packed; |
234 | ||
235 | /* This structure is sent during the storage protocol negotiations. */ | |
236 | struct vmstorage_protocol_version { | |
237 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 238 | u16 major_minor; |
f0d79fe9 S |
239 | |
240 | /* | |
241 | * Revision number is auto-incremented whenever this file is changed | |
242 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
243 | * definitely indicate incompatibility--but it does indicate mismatched | |
244 | * builds. | |
c649114a | 245 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 246 | */ |
85904a5e | 247 | u16 revision; |
f0d79fe9 S |
248 | } __packed; |
249 | ||
250 | /* Channel Property Flags */ | |
251 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
252 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
253 | ||
254 | struct vstor_packet { | |
255 | /* Requested operation type */ | |
256 | enum vstor_packet_operation operation; | |
257 | ||
258 | /* Flags - see below for values */ | |
c649114a | 259 | u32 flags; |
f0d79fe9 S |
260 | |
261 | /* Status of the request returned from the server side. */ | |
c649114a | 262 | u32 status; |
f0d79fe9 S |
263 | |
264 | /* Data payload area */ | |
265 | union { | |
266 | /* | |
267 | * Structure used to forward SCSI commands from the | |
268 | * client to the server. | |
269 | */ | |
270 | struct vmscsi_request vm_srb; | |
271 | ||
272 | /* Structure used to query channel properties. */ | |
273 | struct vmstorage_channel_properties storage_channel_properties; | |
274 | ||
275 | /* Used during version negotiations. */ | |
276 | struct vmstorage_protocol_version version; | |
8b612fa2 S |
277 | |
278 | /* Fibre channel address packet */ | |
279 | struct hv_fc_wwn_packet wwn_packet; | |
280 | ||
281 | /* Number of sub-channels to create */ | |
282 | u16 sub_channel_count; | |
283 | ||
284 | /* This will be the maximum of the union members */ | |
285 | u8 buffer[0x34]; | |
f0d79fe9 S |
286 | }; |
287 | } __packed; | |
288 | ||
f0d79fe9 | 289 | /* |
09f0355f S |
290 | * Packet Flags: |
291 | * | |
f0d79fe9 S |
292 | * This flag indicates that the server should send back a completion for this |
293 | * packet. | |
294 | */ | |
09f0355f | 295 | |
f0d79fe9 S |
296 | #define REQUEST_COMPLETION_FLAG 0x1 |
297 | ||
f0d79fe9 S |
298 | /* Matches Windows-end */ |
299 | enum storvsc_request_type { | |
c649114a | 300 | WRITE_TYPE = 0, |
f0d79fe9 S |
301 | READ_TYPE, |
302 | UNKNOWN_TYPE, | |
303 | }; | |
304 | ||
16046320 | 305 | /* |
b8a5376c MK |
306 | * SRB status codes and masks. In the 8-bit field, the two high order bits |
307 | * are flags, while the remaining 6 bits are an integer status code. The | |
308 | * definitions here include only the subset of the integer status codes that | |
309 | * are tested for in this driver. | |
16046320 | 310 | */ |
16046320 | 311 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 |
3209f9d7 | 312 | #define SRB_STATUS_QUEUE_FROZEN 0x40 |
b8a5376c MK |
313 | |
314 | /* SRB status integer codes */ | |
315 | #define SRB_STATUS_SUCCESS 0x01 | |
316 | #define SRB_STATUS_ABORTED 0x02 | |
317 | #define SRB_STATUS_ERROR 0x04 | |
318 | #define SRB_STATUS_INVALID_REQUEST 0x06 | |
319 | #define SRB_STATUS_DATA_OVERRUN 0x12 | |
320 | #define SRB_STATUS_INVALID_LUN 0x20 | |
f4d1a8e0 | 321 | #define SRB_STATUS_INTERNAL_ERROR 0x30 |
16046320 | 322 | |
3209f9d7 S |
323 | #define SRB_STATUS(status) \ |
324 | (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) | |
af9584b8 S |
325 | /* |
326 | * This is the end of Protocol specific defines. | |
327 | */ | |
328 | ||
ed2e63aa | 329 | static int storvsc_ringbuffer_size = (128 * 1024); |
f458aada | 330 | static u32 max_outstanding_req_per_channel; |
adfbd028 | 331 | static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); |
f458aada S |
332 | |
333 | static int storvsc_vcpus_per_sub_channel = 4; | |
a81a38cc | 334 | static unsigned int storvsc_max_hw_queues; |
af9584b8 S |
335 | |
336 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
337 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
338 | ||
a81a38cc MPM |
339 | module_param(storvsc_max_hw_queues, uint, 0644); |
340 | MODULE_PARM_DESC(storvsc_max_hw_queues, "Maximum number of hardware queues"); | |
341 | ||
f458aada | 342 | module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
74e26784 | 343 | MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
2217a47d LL |
344 | |
345 | static int ring_avail_percent_lowater = 10; | |
346 | module_param(ring_avail_percent_lowater, int, S_IRUGO); | |
347 | MODULE_PARM_DESC(ring_avail_percent_lowater, | |
348 | "Select a channel if available ring size > this in percent"); | |
349 | ||
893def38 S |
350 | /* |
351 | * Timeout in seconds for all devices managed by this driver. | |
352 | */ | |
353 | static int storvsc_timeout = 180; | |
354 | ||
dac58241 S |
355 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
356 | static struct scsi_transport_template *fc_transport_template; | |
357 | #endif | |
af9584b8 | 358 | |
453de21c | 359 | static struct scsi_host_template scsi_driver; |
6f94d5de S |
360 | static void storvsc_on_channel_callback(void *context); |
361 | ||
4cd83ecd S |
362 | #define STORVSC_MAX_LUNS_PER_TARGET 255 |
363 | #define STORVSC_MAX_TARGETS 2 | |
364 | #define STORVSC_MAX_CHANNELS 8 | |
af9584b8 | 365 | |
4cd83ecd S |
366 | #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
367 | #define STORVSC_FC_MAX_TARGETS 128 | |
368 | #define STORVSC_FC_MAX_CHANNELS 8 | |
af9584b8 | 369 | |
4cd83ecd S |
370 | #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
371 | #define STORVSC_IDE_MAX_TARGETS 1 | |
372 | #define STORVSC_IDE_MAX_CHANNELS 1 | |
16046320 | 373 | |
adae1e93 | 374 | /* |
86c8fb4d | 375 | * Upper bound on the size of a storvsc packet. |
adae1e93 AB |
376 | */ |
377 | #define STORVSC_MAX_PKT_SIZE (sizeof(struct vmpacket_descriptor) +\ | |
378 | sizeof(struct vstor_packet)) | |
379 | ||
61eaffc9 | 380 | struct storvsc_cmd_request { |
61eaffc9 S |
381 | struct scsi_cmnd *cmd; |
382 | ||
f0d79fe9 S |
383 | struct hv_device *device; |
384 | ||
385 | /* Synchronize the request/response if needed */ | |
386 | struct completion wait_event; | |
387 | ||
be0cf6ca S |
388 | struct vmbus_channel_packet_multipage_buffer mpb; |
389 | struct vmbus_packet_mpb_array *payload; | |
390 | u32 payload_sz; | |
391 | ||
f0d79fe9 S |
392 | struct vstor_packet vstor_packet; |
393 | }; | |
394 | ||
395 | ||
f0d79fe9 S |
396 | /* A storvsc device is a device object that contains a vmbus channel */ |
397 | struct storvsc_device { | |
398 | struct hv_device *device; | |
399 | ||
400 | bool destroy; | |
401 | bool drain_notify; | |
402 | atomic_t num_outstanding_req; | |
cd654ea1 | 403 | struct Scsi_Host *host; |
f0d79fe9 S |
404 | |
405 | wait_queue_head_t waiting_to_drain; | |
406 | ||
407 | /* | |
408 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
409 | * controller. In reality, the pathid, targetid is always 0 | |
410 | * and the port is set by us | |
411 | */ | |
412 | unsigned int port_number; | |
413 | unsigned char path_id; | |
414 | unsigned char target_id; | |
415 | ||
5117b936 S |
416 | /* |
417 | * Max I/O, the device can support. | |
418 | */ | |
419 | u32 max_transfer_bytes; | |
d86adf48 S |
420 | /* |
421 | * Number of sub-channels we will open. | |
422 | */ | |
423 | u16 num_sc; | |
424 | struct vmbus_channel **stor_chns; | |
425 | /* | |
426 | * Mask of CPUs bound to subchannels. | |
427 | */ | |
428 | struct cpumask alloced_cpus; | |
21d2052c APM |
429 | /* |
430 | * Serializes modifications of stor_chns[] from storvsc_do_io() | |
431 | * and storvsc_change_target_cpu(). | |
432 | */ | |
433 | spinlock_t lock; | |
f0d79fe9 | 434 | /* Used for vsc/vsp channel reset process */ |
61eaffc9 S |
435 | struct storvsc_cmd_request init_request; |
436 | struct storvsc_cmd_request reset_request; | |
dac58241 S |
437 | /* |
438 | * Currently active port and node names for FC devices. | |
439 | */ | |
440 | u64 node_name; | |
441 | u64 port_name; | |
daf0cd44 CA |
442 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
443 | struct fc_rport *rport; | |
444 | #endif | |
f0d79fe9 S |
445 | }; |
446 | ||
ce3e301c S |
447 | struct hv_host_device { |
448 | struct hv_device *dev; | |
c1b3d067 S |
449 | unsigned int port; |
450 | unsigned char path; | |
451 | unsigned char target; | |
436ad941 | 452 | struct workqueue_struct *handle_error_wq; |
c58cc70f LL |
453 | struct work_struct host_scan_work; |
454 | struct Scsi_Host *host; | |
c1b3d067 S |
455 | }; |
456 | ||
12675799 S |
457 | struct storvsc_scan_work { |
458 | struct work_struct work; | |
459 | struct Scsi_Host *host; | |
98441221 S |
460 | u8 lun; |
461 | u8 tgt_id; | |
12675799 S |
462 | }; |
463 | ||
6781209e S |
464 | static void storvsc_device_scan(struct work_struct *work) |
465 | { | |
466 | struct storvsc_scan_work *wrk; | |
6781209e S |
467 | struct scsi_device *sdev; |
468 | ||
469 | wrk = container_of(work, struct storvsc_scan_work, work); | |
6781209e | 470 | |
98441221 | 471 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
6781209e S |
472 | if (!sdev) |
473 | goto done; | |
474 | scsi_rescan_device(&sdev->sdev_gendev); | |
475 | scsi_device_put(sdev); | |
476 | ||
477 | done: | |
478 | kfree(wrk); | |
479 | } | |
480 | ||
2a09ed3d | 481 | static void storvsc_host_scan(struct work_struct *work) |
12675799 | 482 | { |
2a09ed3d | 483 | struct Scsi_Host *host; |
34a716bc | 484 | struct scsi_device *sdev; |
c58cc70f LL |
485 | struct hv_host_device *host_device = |
486 | container_of(work, struct hv_host_device, host_scan_work); | |
12675799 | 487 | |
c58cc70f | 488 | host = host_device->host; |
34a716bc S |
489 | /* |
490 | * Before scanning the host, first check to see if any of the | |
5445e08e | 491 | * currently known devices have been hot removed. We issue a |
34a716bc S |
492 | * "unit ready" command against all currently known devices. |
493 | * This I/O will result in an error for devices that have been | |
494 | * removed. As part of handling the I/O error, we remove the device. | |
495 | * | |
496 | * When a LUN is added or removed, the host sends us a signal to | |
497 | * scan the host. Thus we are forced to discover the LUNs that | |
498 | * may have been removed this way. | |
499 | */ | |
500 | mutex_lock(&host->scan_mutex); | |
8d6a9f56 | 501 | shost_for_each_device(sdev, host) |
34a716bc | 502 | scsi_test_unit_ready(sdev, 1, 1, NULL); |
34a716bc S |
503 | mutex_unlock(&host->scan_mutex); |
504 | /* | |
505 | * Now scan the host to discover LUNs that may have been added. | |
506 | */ | |
2a09ed3d | 507 | scsi_scan_host(host); |
12675799 S |
508 | } |
509 | ||
b4017319 S |
510 | static void storvsc_remove_lun(struct work_struct *work) |
511 | { | |
512 | struct storvsc_scan_work *wrk; | |
513 | struct scsi_device *sdev; | |
514 | ||
515 | wrk = container_of(work, struct storvsc_scan_work, work); | |
516 | if (!scsi_host_get(wrk->host)) | |
517 | goto done; | |
518 | ||
98441221 | 519 | sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
b4017319 S |
520 | |
521 | if (sdev) { | |
522 | scsi_remove_device(sdev); | |
523 | scsi_device_put(sdev); | |
524 | } | |
525 | scsi_host_put(wrk->host); | |
526 | ||
527 | done: | |
528 | kfree(wrk); | |
529 | } | |
530 | ||
af9584b8 | 531 | |
a8c18c57 S |
532 | /* |
533 | * We can get incoming messages from the host that are not in response to | |
534 | * messages that we have sent out. An example of this would be messages | |
535 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
536 | * deal with potential race conditions where the driver may be in the | |
537 | * midst of being unloaded when we might receive an unsolicited message | |
538 | * from the host, we have implemented a mechanism to gurantee sequential | |
539 | * consistency: | |
540 | * | |
541 | * 1) Once the device is marked as being destroyed, we will fail all | |
542 | * outgoing messages. | |
543 | * 2) We permit incoming messages when the device is being destroyed, | |
544 | * only to properly account for messages already sent out. | |
545 | */ | |
546 | ||
f0d79fe9 S |
547 | static inline struct storvsc_device *get_out_stor_device( |
548 | struct hv_device *device) | |
549 | { | |
550 | struct storvsc_device *stor_device; | |
551 | ||
cd654ea1 | 552 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
553 | |
554 | if (stor_device && stor_device->destroy) | |
555 | stor_device = NULL; | |
556 | ||
557 | return stor_device; | |
558 | } | |
559 | ||
560 | ||
561 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
562 | { | |
563 | dev->drain_notify = true; | |
564 | wait_event(dev->waiting_to_drain, | |
565 | atomic_read(&dev->num_outstanding_req) == 0); | |
566 | dev->drain_notify = false; | |
567 | } | |
bef4a34a | 568 | |
8dcf37d4 S |
569 | static inline struct storvsc_device *get_in_stor_device( |
570 | struct hv_device *device) | |
571 | { | |
572 | struct storvsc_device *stor_device; | |
8dcf37d4 | 573 | |
cd654ea1 | 574 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
575 | |
576 | if (!stor_device) | |
577 | goto get_in_err; | |
578 | ||
579 | /* | |
580 | * If the device is being destroyed; allow incoming | |
581 | * traffic only to cleanup outstanding requests. | |
582 | */ | |
583 | ||
584 | if (stor_device->destroy && | |
585 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
586 | stor_device = NULL; | |
587 | ||
588 | get_in_err: | |
8dcf37d4 S |
589 | return stor_device; |
590 | ||
591 | } | |
592 | ||
7769e18c APM |
593 | static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, |
594 | u32 new) | |
595 | { | |
596 | struct storvsc_device *stor_device; | |
597 | struct vmbus_channel *cur_chn; | |
598 | bool old_is_alloced = false; | |
599 | struct hv_device *device; | |
600 | unsigned long flags; | |
601 | int cpu; | |
602 | ||
603 | device = channel->primary_channel ? | |
604 | channel->primary_channel->device_obj | |
605 | : channel->device_obj; | |
606 | stor_device = get_out_stor_device(device); | |
607 | if (!stor_device) | |
608 | return; | |
609 | ||
610 | /* See storvsc_do_io() -> get_og_chn(). */ | |
21d2052c | 611 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
612 | |
613 | /* | |
614 | * Determines if the storvsc device has other channels assigned to | |
615 | * the "old" CPU to update the alloced_cpus mask and the stor_chns | |
616 | * array. | |
617 | */ | |
618 | if (device->channel != channel && device->channel->target_cpu == old) { | |
619 | cur_chn = device->channel; | |
620 | old_is_alloced = true; | |
621 | goto old_is_alloced; | |
622 | } | |
623 | list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { | |
624 | if (cur_chn == channel) | |
625 | continue; | |
626 | if (cur_chn->target_cpu == old) { | |
627 | old_is_alloced = true; | |
628 | goto old_is_alloced; | |
629 | } | |
630 | } | |
631 | ||
632 | old_is_alloced: | |
633 | if (old_is_alloced) | |
634 | WRITE_ONCE(stor_device->stor_chns[old], cur_chn); | |
635 | else | |
636 | cpumask_clear_cpu(old, &stor_device->alloced_cpus); | |
637 | ||
638 | /* "Flush" the stor_chns array. */ | |
639 | for_each_possible_cpu(cpu) { | |
640 | if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( | |
641 | cpu, &stor_device->alloced_cpus)) | |
642 | WRITE_ONCE(stor_device->stor_chns[cpu], NULL); | |
643 | } | |
644 | ||
645 | WRITE_ONCE(stor_device->stor_chns[new], channel); | |
646 | cpumask_set_cpu(new, &stor_device->alloced_cpus); | |
647 | ||
21d2052c | 648 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
649 | } |
650 | ||
bf5fd8ca APM |
651 | static u64 storvsc_next_request_id(struct vmbus_channel *channel, u64 rqst_addr) |
652 | { | |
653 | struct storvsc_cmd_request *request = | |
654 | (struct storvsc_cmd_request *)(unsigned long)rqst_addr; | |
655 | ||
656 | if (rqst_addr == VMBUS_RQST_INIT) | |
657 | return VMBUS_RQST_INIT; | |
658 | if (rqst_addr == VMBUS_RQST_RESET) | |
659 | return VMBUS_RQST_RESET; | |
660 | ||
661 | /* | |
662 | * Cannot return an ID of 0, which is reserved for an unsolicited | |
663 | * message from Hyper-V. | |
664 | */ | |
c5bf198c | 665 | return (u64)blk_mq_unique_tag(scsi_cmd_to_rq(request->cmd)) + 1; |
bf5fd8ca APM |
666 | } |
667 | ||
6f94d5de S |
668 | static void handle_sc_creation(struct vmbus_channel *new_sc) |
669 | { | |
670 | struct hv_device *device = new_sc->primary_channel->device_obj; | |
c9675904 | 671 | struct device *dev = &device->device; |
6f94d5de S |
672 | struct storvsc_device *stor_device; |
673 | struct vmstorage_channel_properties props; | |
c9675904 | 674 | int ret; |
6f94d5de S |
675 | |
676 | stor_device = get_out_stor_device(device); | |
677 | if (!stor_device) | |
678 | return; | |
679 | ||
6f94d5de | 680 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
adae1e93 | 681 | new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
6f94d5de | 682 | |
bf5fd8ca | 683 | new_sc->next_request_id_callback = storvsc_next_request_id; |
453de21c | 684 | |
c9675904 DC |
685 | ret = vmbus_open(new_sc, |
686 | storvsc_ringbuffer_size, | |
687 | storvsc_ringbuffer_size, | |
688 | (void *)&props, | |
689 | sizeof(struct vmstorage_channel_properties), | |
690 | storvsc_on_channel_callback, new_sc); | |
d86adf48 | 691 | |
c9675904 DC |
692 | /* In case vmbus_open() fails, we don't use the sub-channel. */ |
693 | if (ret != 0) { | |
694 | dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); | |
695 | return; | |
d86adf48 | 696 | } |
c9675904 | 697 | |
7769e18c APM |
698 | new_sc->change_target_cpu_callback = storvsc_change_target_cpu; |
699 | ||
c9675904 DC |
700 | /* Add the sub-channel to the array of available channels. */ |
701 | stor_device->stor_chns[new_sc->target_cpu] = new_sc; | |
702 | cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); | |
6f94d5de S |
703 | } |
704 | ||
705 | static void handle_multichannel_storage(struct hv_device *device, int max_chns) | |
706 | { | |
c9675904 | 707 | struct device *dev = &device->device; |
6f94d5de | 708 | struct storvsc_device *stor_device; |
6f94d5de S |
709 | int num_sc; |
710 | struct storvsc_cmd_request *request; | |
711 | struct vstor_packet *vstor_packet; | |
712 | int ret, t; | |
713 | ||
382e06d1 MK |
714 | /* |
715 | * If the number of CPUs is artificially restricted, such as | |
716 | * with maxcpus=1 on the kernel boot line, Hyper-V could offer | |
717 | * sub-channels >= the number of CPUs. These sub-channels | |
718 | * should not be created. The primary channel is already created | |
719 | * and assigned to one CPU, so check against # CPUs - 1. | |
720 | */ | |
721 | num_sc = min((int)(num_online_cpus() - 1), max_chns); | |
722 | if (!num_sc) | |
723 | return; | |
724 | ||
6f94d5de S |
725 | stor_device = get_out_stor_device(device); |
726 | if (!stor_device) | |
727 | return; | |
728 | ||
d86adf48 | 729 | stor_device->num_sc = num_sc; |
6f94d5de S |
730 | request = &stor_device->init_request; |
731 | vstor_packet = &request->vstor_packet; | |
732 | ||
6f94d5de S |
733 | /* |
734 | * Establish a handler for dealing with subchannels. | |
735 | */ | |
736 | vmbus_set_sc_create_callback(device->channel, handle_sc_creation); | |
737 | ||
6f94d5de S |
738 | /* |
739 | * Request the host to create sub-channels. | |
740 | */ | |
741 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
742 | init_completion(&request->wait_event); | |
743 | vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; | |
744 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
745 | vstor_packet->sub_channel_count = num_sc; | |
746 | ||
747 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
86c8fb4d | 748 | sizeof(struct vstor_packet), |
bf5fd8ca | 749 | VMBUS_RQST_INIT, |
6f94d5de S |
750 | VM_PKT_DATA_INBAND, |
751 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
752 | ||
c9675904 DC |
753 | if (ret != 0) { |
754 | dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); | |
6f94d5de | 755 | return; |
c9675904 | 756 | } |
6f94d5de S |
757 | |
758 | t = wait_for_completion_timeout(&request->wait_event, 10*HZ); | |
c9675904 DC |
759 | if (t == 0) { |
760 | dev_err(dev, "Failed to create sub-channel: timed out\n"); | |
6f94d5de | 761 | return; |
c9675904 | 762 | } |
6f94d5de S |
763 | |
764 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
c9675904 DC |
765 | vstor_packet->status != 0) { |
766 | dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", | |
767 | vstor_packet->operation, vstor_packet->status); | |
6f94d5de | 768 | return; |
c9675904 | 769 | } |
6f94d5de S |
770 | |
771 | /* | |
c9675904 DC |
772 | * We need to do nothing here, because vmbus_process_offer() |
773 | * invokes channel->sc_creation_callback, which will open and use | |
774 | * the sub-channel(s). | |
6f94d5de | 775 | */ |
6f94d5de S |
776 | } |
777 | ||
dac58241 S |
778 | static void cache_wwn(struct storvsc_device *stor_device, |
779 | struct vstor_packet *vstor_packet) | |
780 | { | |
781 | /* | |
782 | * Cache the currently active port and node ww names. | |
783 | */ | |
784 | if (vstor_packet->wwn_packet.primary_active) { | |
785 | stor_device->node_name = | |
786 | wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); | |
787 | stor_device->port_name = | |
788 | wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); | |
789 | } else { | |
790 | stor_device->node_name = | |
791 | wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); | |
792 | stor_device->port_name = | |
793 | wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); | |
794 | } | |
795 | } | |
796 | ||
59635018 S |
797 | |
798 | static int storvsc_execute_vstor_op(struct hv_device *device, | |
799 | struct storvsc_cmd_request *request, | |
800 | bool status_check) | |
8dcf37d4 | 801 | { |
244808e0 | 802 | struct storvsc_device *stor_device; |
8dcf37d4 | 803 | struct vstor_packet *vstor_packet; |
59635018 | 804 | int ret, t; |
8dcf37d4 | 805 | |
244808e0 APM |
806 | stor_device = get_out_stor_device(device); |
807 | if (!stor_device) | |
808 | return -ENODEV; | |
809 | ||
8dcf37d4 S |
810 | vstor_packet = &request->vstor_packet; |
811 | ||
8dcf37d4 | 812 | init_completion(&request->wait_event); |
8dcf37d4 S |
813 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
814 | ||
815 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
86c8fb4d | 816 | sizeof(struct vstor_packet), |
bf5fd8ca | 817 | VMBUS_RQST_INIT, |
8dcf37d4 S |
818 | VM_PKT_DATA_INBAND, |
819 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
820 | if (ret != 0) | |
dac58241 | 821 | return ret; |
8dcf37d4 S |
822 | |
823 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
dac58241 S |
824 | if (t == 0) |
825 | return -ETIMEDOUT; | |
8dcf37d4 | 826 | |
59635018 S |
827 | if (!status_check) |
828 | return ret; | |
829 | ||
8dcf37d4 | 830 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
dac58241 S |
831 | vstor_packet->status != 0) |
832 | return -EINVAL; | |
8dcf37d4 | 833 | |
59635018 S |
834 | return ret; |
835 | } | |
836 | ||
837 | static int storvsc_channel_init(struct hv_device *device, bool is_fc) | |
838 | { | |
839 | struct storvsc_device *stor_device; | |
840 | struct storvsc_cmd_request *request; | |
841 | struct vstor_packet *vstor_packet; | |
842 | int ret, i; | |
843 | int max_chns; | |
844 | bool process_sub_channels = false; | |
845 | ||
846 | stor_device = get_out_stor_device(device); | |
847 | if (!stor_device) | |
848 | return -ENODEV; | |
849 | ||
850 | request = &stor_device->init_request; | |
851 | vstor_packet = &request->vstor_packet; | |
852 | ||
853 | /* | |
854 | * Now, initiate the vsc/vsp initialization protocol on the open | |
855 | * channel | |
856 | */ | |
857 | memset(request, 0, sizeof(struct storvsc_cmd_request)); | |
858 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
859 | ret = storvsc_execute_vstor_op(device, request, true); | |
860 | if (ret) | |
861 | return ret; | |
862 | /* | |
863 | * Query host supported protocol version. | |
864 | */ | |
8dcf37d4 | 865 | |
86c8fb4d | 866 | for (i = 0; i < ARRAY_SIZE(protocol_version); i++) { |
1a363108 KM |
867 | /* reuse the packet for version range supported */ |
868 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
869 | vstor_packet->operation = | |
870 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
8dcf37d4 | 871 | |
86c8fb4d | 872 | vstor_packet->version.major_minor = protocol_version[i]; |
85904a5e | 873 | |
1a363108 KM |
874 | /* |
875 | * The revision number is only used in Windows; set it to 0. | |
876 | */ | |
877 | vstor_packet->version.revision = 0; | |
59635018 | 878 | ret = storvsc_execute_vstor_op(device, request, false); |
1a363108 | 879 | if (ret != 0) |
dac58241 | 880 | return ret; |
8dcf37d4 | 881 | |
dac58241 S |
882 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
883 | return -EINVAL; | |
1a363108 KM |
884 | |
885 | if (vstor_packet->status == 0) { | |
86c8fb4d | 886 | vmstor_proto_version = protocol_version[i]; |
1a363108 KM |
887 | |
888 | break; | |
889 | } | |
8dcf37d4 S |
890 | } |
891 | ||
86c8fb4d SS |
892 | if (vstor_packet->status != 0) { |
893 | dev_err(&device->device, "Obsolete Hyper-V version\n"); | |
dac58241 | 894 | return -EINVAL; |
86c8fb4d | 895 | } |
8dcf37d4 S |
896 | |
897 | ||
898 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
899 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
59635018 | 900 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 901 | if (ret != 0) |
dac58241 | 902 | return ret; |
8dcf37d4 | 903 | |
6f94d5de S |
904 | /* |
905 | * Check to see if multi-channel support is there. | |
906 | * Hosts that implement protocol version of 5.1 and above | |
907 | * support multi-channel. | |
908 | */ | |
909 | max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; | |
d86adf48 S |
910 | |
911 | /* | |
912 | * Allocate state to manage the sub-channels. | |
913 | * We allocate an array based on the numbers of possible CPUs | |
914 | * (Hyper-V does not support cpu online/offline). | |
915 | * This Array will be sparseley populated with unique | |
916 | * channels - primary + sub-channels. | |
917 | * We will however populate all the slots to evenly distribute | |
918 | * the load. | |
919 | */ | |
e0408528 | 920 | stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), |
d86adf48 S |
921 | GFP_KERNEL); |
922 | if (stor_device->stor_chns == NULL) | |
923 | return -ENOMEM; | |
924 | ||
7769e18c APM |
925 | device->channel->change_target_cpu_callback = storvsc_change_target_cpu; |
926 | ||
d86adf48 S |
927 | stor_device->stor_chns[device->channel->target_cpu] = device->channel; |
928 | cpumask_set_cpu(device->channel->target_cpu, | |
929 | &stor_device->alloced_cpus); | |
930 | ||
86c8fb4d SS |
931 | if (vstor_packet->storage_channel_properties.flags & |
932 | STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) | |
933 | process_sub_channels = true; | |
934 | ||
5117b936 S |
935 | stor_device->max_transfer_bytes = |
936 | vstor_packet->storage_channel_properties.max_transfer_bytes; | |
6f94d5de | 937 | |
dac58241 S |
938 | if (!is_fc) |
939 | goto done; | |
940 | ||
59635018 S |
941 | /* |
942 | * For FC devices retrieve FC HBA data. | |
943 | */ | |
dac58241 S |
944 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
945 | vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; | |
59635018 | 946 | ret = storvsc_execute_vstor_op(device, request, true); |
dac58241 S |
947 | if (ret != 0) |
948 | return ret; | |
949 | ||
dac58241 S |
950 | /* |
951 | * Cache the currently active port and node ww names. | |
952 | */ | |
953 | cache_wwn(stor_device, vstor_packet); | |
954 | ||
955 | done: | |
956 | ||
8dcf37d4 S |
957 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
958 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
59635018 | 959 | ret = storvsc_execute_vstor_op(device, request, true); |
8dcf37d4 | 960 | if (ret != 0) |
dac58241 | 961 | return ret; |
8dcf37d4 | 962 | |
6f94d5de S |
963 | if (process_sub_channels) |
964 | handle_multichannel_storage(device, max_chns); | |
965 | ||
8dcf37d4 S |
966 | return ret; |
967 | } | |
968 | ||
c50bd448 S |
969 | static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
970 | struct scsi_cmnd *scmnd, | |
971 | struct Scsi_Host *host, | |
972 | u8 asc, u8 ascq) | |
973 | { | |
974 | struct storvsc_scan_work *wrk; | |
975 | void (*process_err_fn)(struct work_struct *work); | |
436ad941 | 976 | struct hv_host_device *host_dev = shost_priv(host); |
c50bd448 | 977 | |
b8a5376c MK |
978 | switch (SRB_STATUS(vm_srb->srb_status)) { |
979 | case SRB_STATUS_ERROR: | |
980 | case SRB_STATUS_ABORTED: | |
981 | case SRB_STATUS_INVALID_REQUEST: | |
f4d1a8e0 | 982 | case SRB_STATUS_INTERNAL_ERROR: |
b8a5376c MK |
983 | if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) { |
984 | /* Check for capacity change */ | |
985 | if ((asc == 0x2a) && (ascq == 0x9)) { | |
986 | process_err_fn = storvsc_device_scan; | |
987 | /* Retry the I/O that triggered this. */ | |
988 | set_host_byte(scmnd, DID_REQUEUE); | |
989 | goto do_work; | |
990 | } | |
52e1b3b3 | 991 | |
11d9874c MK |
992 | /* |
993 | * Check for "Operating parameters have changed" | |
994 | * due to Hyper-V changing the VHD/VHDX BlockSize | |
995 | * when adding/removing a differencing disk. This | |
996 | * causes discard_granularity to change, so do a | |
997 | * rescan to pick up the new granularity. We don't | |
998 | * want scsi_report_sense() to output a message | |
999 | * that a sysadmin wouldn't know what to do with. | |
1000 | */ | |
1001 | if ((asc == 0x3f) && (ascq != 0x03) && | |
1002 | (ascq != 0x0e)) { | |
1003 | process_err_fn = storvsc_device_scan; | |
1004 | set_host_byte(scmnd, DID_REQUEUE); | |
1005 | goto do_work; | |
1006 | } | |
1007 | ||
52e1b3b3 | 1008 | /* |
b8a5376c MK |
1009 | * Otherwise, let upper layer deal with the |
1010 | * error when sense message is present | |
52e1b3b3 | 1011 | */ |
52e1b3b3 | 1012 | return; |
b8a5376c | 1013 | } |
52e1b3b3 | 1014 | |
c50bd448 S |
1015 | /* |
1016 | * If there is an error; offline the device since all | |
1017 | * error recovery strategies would have already been | |
1018 | * deployed on the host side. However, if the command | |
1019 | * were a pass-through command deal with it appropriately. | |
1020 | */ | |
1021 | switch (scmnd->cmnd[0]) { | |
1022 | case ATA_16: | |
1023 | case ATA_12: | |
1024 | set_host_byte(scmnd, DID_PASSTHROUGH); | |
1025 | break; | |
3533f860 | 1026 | /* |
52e1b3b3 MK |
1027 | * On some Hyper-V hosts TEST_UNIT_READY command can |
1028 | * return SRB_STATUS_ERROR. Let the upper level code | |
1029 | * deal with it based on the sense information. | |
3533f860 S |
1030 | */ |
1031 | case TEST_UNIT_READY: | |
1032 | break; | |
c50bd448 | 1033 | default: |
d1b8b239 | 1034 | set_host_byte(scmnd, DID_ERROR); |
c50bd448 | 1035 | } |
b8a5376c MK |
1036 | return; |
1037 | ||
1038 | case SRB_STATUS_INVALID_LUN: | |
1039 | set_host_byte(scmnd, DID_NO_CONNECT); | |
1040 | process_err_fn = storvsc_remove_lun; | |
1041 | goto do_work; | |
1042 | ||
c50bd448 | 1043 | } |
52e1b3b3 | 1044 | return; |
6781209e | 1045 | |
52e1b3b3 | 1046 | do_work: |
c50bd448 S |
1047 | /* |
1048 | * We need to schedule work to process this error; schedule it. | |
1049 | */ | |
1050 | wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
1051 | if (!wrk) { | |
a6cb5462 | 1052 | set_host_byte(scmnd, DID_BAD_TARGET); |
c50bd448 S |
1053 | return; |
1054 | } | |
1055 | ||
1056 | wrk->host = host; | |
1057 | wrk->lun = vm_srb->lun; | |
98441221 | 1058 | wrk->tgt_id = vm_srb->target_id; |
c50bd448 | 1059 | INIT_WORK(&wrk->work, process_err_fn); |
436ad941 | 1060 | queue_work(host_dev->handle_error_wq, &wrk->work); |
c50bd448 S |
1061 | } |
1062 | ||
2707388c | 1063 | |
03996f20 S |
1064 | static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
1065 | struct storvsc_device *stor_dev) | |
8dcf37d4 | 1066 | { |
2707388c | 1067 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
2707388c S |
1068 | struct scsi_sense_hdr sense_hdr; |
1069 | struct vmscsi_request *vm_srb; | |
40630f46 | 1070 | u32 data_transfer_length; |
c50bd448 | 1071 | struct Scsi_Host *host; |
be0cf6ca S |
1072 | u32 payload_sz = cmd_request->payload_sz; |
1073 | void *payload = cmd_request->payload; | |
08f76547 | 1074 | bool sense_ok; |
c50bd448 | 1075 | |
c50bd448 | 1076 | host = stor_dev->host; |
8dcf37d4 | 1077 | |
61eaffc9 | 1078 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
40630f46 | 1079 | data_transfer_length = vm_srb->data_transfer_length; |
8dcf37d4 | 1080 | |
42e22cac S |
1081 | scmnd->result = vm_srb->scsi_status; |
1082 | ||
2707388c | 1083 | if (scmnd->result) { |
08f76547 MK |
1084 | sense_ok = scsi_normalize_sense(scmnd->sense_buffer, |
1085 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
1086 | ||
1087 | if (sense_ok && do_logging(STORVSC_LOGGING_WARN)) | |
d811b848 HR |
1088 | scsi_print_sense_hdr(scmnd->device, "storvsc", |
1089 | &sense_hdr); | |
2707388c S |
1090 | } |
1091 | ||
40630f46 | 1092 | if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { |
c50bd448 S |
1093 | storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
1094 | sense_hdr.ascq); | |
40630f46 LL |
1095 | /* |
1096 | * The Windows driver set data_transfer_length on | |
1097 | * SRB_STATUS_DATA_OVERRUN. On other errors, this value | |
1098 | * is untouched. In these cases we set it to 0. | |
1099 | */ | |
1100 | if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) | |
1101 | data_transfer_length = 0; | |
1102 | } | |
c50bd448 | 1103 | |
0a765665 AB |
1104 | /* Validate data_transfer_length (from Hyper-V) */ |
1105 | if (data_transfer_length > cmd_request->payload->range.len) | |
1106 | data_transfer_length = cmd_request->payload->range.len; | |
1107 | ||
2707388c | 1108 | scsi_set_resid(scmnd, |
40630f46 | 1109 | cmd_request->payload->range.len - data_transfer_length); |
2707388c | 1110 | |
0c31fa0e | 1111 | scsi_done(scmnd); |
be0cf6ca S |
1112 | |
1113 | if (payload_sz > | |
1114 | sizeof(struct vmbus_channel_packet_multipage_buffer)) | |
1115 | kfree(payload); | |
2707388c S |
1116 | } |
1117 | ||
03996f20 | 1118 | static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
2707388c | 1119 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1120 | struct storvsc_cmd_request *request) |
2707388c | 1121 | { |
2707388c | 1122 | struct vstor_packet *stor_pkt; |
03996f20 | 1123 | struct hv_device *device = stor_device->device; |
2707388c | 1124 | |
2707388c S |
1125 | stor_pkt = &request->vstor_packet; |
1126 | ||
1127 | /* | |
1128 | * The current SCSI handling on the host side does | |
1129 | * not correctly handle: | |
1130 | * INQUIRY command with page code parameter set to 0x80 | |
1131 | * MODE_SENSE command with cmd[2] == 0x1c | |
1132 | * | |
1133 | * Setup srb and scsi status so this won't be fatal. | |
1134 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
1135 | * (srb status == 0x4) and off-line the device in that case. |
1136 | */ | |
1137 | ||
1138 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 1139 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 1140 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 1141 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
1142 | } |
1143 | ||
8dcf37d4 S |
1144 | /* Copy over the status...etc */ |
1145 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
1146 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
0a765665 | 1147 | |
d4674859 MK |
1148 | /* |
1149 | * Copy over the sense_info_length, but limit to the known max | |
1150 | * size if Hyper-V returns a bad value. | |
1151 | */ | |
86c8fb4d | 1152 | stor_pkt->vm_srb.sense_info_length = min_t(u8, STORVSC_SENSE_BUFFER_SIZE, |
d4674859 | 1153 | vstor_packet->vm_srb.sense_info_length); |
8dcf37d4 | 1154 | |
f8aea701 | 1155 | if (vstor_packet->vm_srb.scsi_status != 0 || |
dbe7633c MK |
1156 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) { |
1157 | ||
1158 | /* | |
1159 | * Log TEST_UNIT_READY errors only as warnings. Hyper-V can | |
1160 | * return errors when detecting devices using TEST_UNIT_READY, | |
1161 | * and logging these as errors produces unhelpful noise. | |
1162 | */ | |
1163 | int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? | |
1164 | STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR; | |
1165 | ||
1166 | storvsc_log(device, loglevel, | |
08f76547 | 1167 | "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", |
c5bf198c | 1168 | scsi_cmd_to_rq(request->cmd)->tag, |
f8aea701 LL |
1169 | stor_pkt->vm_srb.cdb[0], |
1170 | vstor_packet->vm_srb.scsi_status, | |
08f76547 MK |
1171 | vstor_packet->vm_srb.srb_status, |
1172 | vstor_packet->status); | |
dbe7633c | 1173 | } |
f8aea701 | 1174 | |
d4674859 MK |
1175 | if (vstor_packet->vm_srb.scsi_status == SAM_STAT_CHECK_CONDITION && |
1176 | (vstor_packet->vm_srb.srb_status & SRB_STATUS_AUTOSENSE_VALID)) | |
1177 | memcpy(request->cmd->sense_buffer, | |
1178 | vstor_packet->vm_srb.sense_data, | |
1179 | stor_pkt->vm_srb.sense_info_length); | |
8dcf37d4 S |
1180 | |
1181 | stor_pkt->vm_srb.data_transfer_length = | |
d4674859 | 1182 | vstor_packet->vm_srb.data_transfer_length; |
8dcf37d4 | 1183 | |
03996f20 | 1184 | storvsc_command_completion(request, stor_device); |
8dcf37d4 S |
1185 | |
1186 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
1187 | stor_device->drain_notify) | |
1188 | wake_up(&stor_device->waiting_to_drain); | |
8dcf37d4 S |
1189 | } |
1190 | ||
03996f20 | 1191 | static void storvsc_on_receive(struct storvsc_device *stor_device, |
8dcf37d4 | 1192 | struct vstor_packet *vstor_packet, |
61eaffc9 | 1193 | struct storvsc_cmd_request *request) |
8dcf37d4 | 1194 | { |
c58cc70f | 1195 | struct hv_host_device *host_dev; |
8dcf37d4 S |
1196 | switch (vstor_packet->operation) { |
1197 | case VSTOR_OPERATION_COMPLETE_IO: | |
03996f20 | 1198 | storvsc_on_io_completion(stor_device, vstor_packet, request); |
8dcf37d4 | 1199 | break; |
12675799 | 1200 | |
8dcf37d4 | 1201 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 | 1202 | case VSTOR_OPERATION_ENUMERATE_BUS: |
c58cc70f LL |
1203 | host_dev = shost_priv(stor_device->host); |
1204 | queue_work( | |
1205 | host_dev->handle_error_wq, &host_dev->host_scan_work); | |
12675799 | 1206 | break; |
8dcf37d4 | 1207 | |
dac58241 | 1208 | case VSTOR_OPERATION_FCHBA_DATA: |
dac58241 S |
1209 | cache_wwn(stor_device, vstor_packet); |
1210 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
1211 | fc_host_node_name(stor_device->host) = stor_device->node_name; | |
1212 | fc_host_port_name(stor_device->host) = stor_device->port_name; | |
1213 | #endif | |
1214 | break; | |
8dcf37d4 S |
1215 | default: |
1216 | break; | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | static void storvsc_on_channel_callback(void *context) | |
1221 | { | |
6f94d5de | 1222 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
ddccd952 | 1223 | const struct vmpacket_descriptor *desc; |
6f94d5de | 1224 | struct hv_device *device; |
8dcf37d4 | 1225 | struct storvsc_device *stor_device; |
bf5fd8ca | 1226 | struct Scsi_Host *shost; |
78c65f0f | 1227 | unsigned long time_limit = jiffies + msecs_to_jiffies(CALLBACK_TIMEOUT); |
8dcf37d4 | 1228 | |
6f94d5de S |
1229 | if (channel->primary_channel != NULL) |
1230 | device = channel->primary_channel->device_obj; | |
1231 | else | |
1232 | device = channel->device_obj; | |
8dcf37d4 S |
1233 | |
1234 | stor_device = get_in_stor_device(device); | |
1235 | if (!stor_device) | |
1236 | return; | |
1237 | ||
bf5fd8ca | 1238 | shost = stor_device->host; |
ddccd952 | 1239 | |
bf5fd8ca APM |
1240 | foreach_vmbus_pkt(desc, channel) { |
1241 | struct vstor_packet *packet = hv_pkt_data(desc); | |
1242 | struct storvsc_cmd_request *request = NULL; | |
6fd13d69 | 1243 | u32 pktlen = hv_pkt_datalen(desc); |
bf5fd8ca | 1244 | u64 rqst_id = desc->trans_id; |
86c8fb4d SS |
1245 | u32 minlen = rqst_id ? sizeof(struct vstor_packet) : |
1246 | sizeof(enum vstor_packet_operation); | |
ddccd952 | 1247 | |
78c65f0f SS |
1248 | if (unlikely(time_after(jiffies, time_limit))) { |
1249 | hv_pkt_iter_close(channel); | |
1250 | return; | |
1251 | } | |
1252 | ||
6fd13d69 APM |
1253 | if (pktlen < minlen) { |
1254 | dev_err(&device->device, | |
1255 | "Invalid pkt: id=%llu, len=%u, minlen=%u\n", | |
1256 | rqst_id, pktlen, minlen); | |
91b1b640 APM |
1257 | continue; |
1258 | } | |
1259 | ||
bf5fd8ca APM |
1260 | if (rqst_id == VMBUS_RQST_INIT) { |
1261 | request = &stor_device->init_request; | |
1262 | } else if (rqst_id == VMBUS_RQST_RESET) { | |
1263 | request = &stor_device->reset_request; | |
8dcf37d4 | 1264 | } else { |
bf5fd8ca APM |
1265 | /* Hyper-V can send an unsolicited message with ID of 0 */ |
1266 | if (rqst_id == 0) { | |
1267 | /* | |
1268 | * storvsc_on_receive() looks at the vstor_packet in the message | |
6fd13d69 APM |
1269 | * from the ring buffer. |
1270 | * | |
1271 | * - If the operation in the vstor_packet is COMPLETE_IO, then | |
1272 | * we call storvsc_on_io_completion(), and dereference the | |
1273 | * guest memory address. Make sure we don't call | |
1274 | * storvsc_on_io_completion() with a guest memory address | |
1275 | * that is zero if Hyper-V were to construct and send such | |
1276 | * a bogus packet. | |
1277 | * | |
1278 | * - If the operation in the vstor_packet is FCHBA_DATA, then | |
1279 | * we call cache_wwn(), and access the data payload area of | |
1280 | * the packet (wwn_packet); however, there is no guarantee | |
1281 | * that the packet is big enough to contain such area. | |
1282 | * Future-proof the code by rejecting such a bogus packet. | |
bf5fd8ca | 1283 | */ |
6fd13d69 APM |
1284 | if (packet->operation == VSTOR_OPERATION_COMPLETE_IO || |
1285 | packet->operation == VSTOR_OPERATION_FCHBA_DATA) { | |
bf5fd8ca APM |
1286 | dev_err(&device->device, "Invalid packet with ID of 0\n"); |
1287 | continue; | |
1288 | } | |
1289 | } else { | |
1290 | struct scsi_cmnd *scmnd; | |
1291 | ||
1292 | /* Transaction 'rqst_id' corresponds to tag 'rqst_id - 1' */ | |
1293 | scmnd = scsi_host_find_tag(shost, rqst_id - 1); | |
1294 | if (scmnd == NULL) { | |
1295 | dev_err(&device->device, "Incorrect transaction ID\n"); | |
1296 | continue; | |
1297 | } | |
1298 | request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); | |
743b237c | 1299 | scsi_dma_unmap(scmnd); |
bf5fd8ca APM |
1300 | } |
1301 | ||
ddccd952 | 1302 | storvsc_on_receive(stor_device, packet, request); |
bf5fd8ca | 1303 | continue; |
8dcf37d4 | 1304 | } |
bf5fd8ca APM |
1305 | |
1306 | memcpy(&request->vstor_packet, packet, | |
86c8fb4d | 1307 | sizeof(struct vstor_packet)); |
bf5fd8ca | 1308 | complete(&request->wait_event); |
ddccd952 | 1309 | } |
8dcf37d4 S |
1310 | } |
1311 | ||
dac58241 S |
1312 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
1313 | bool is_fc) | |
8dcf37d4 S |
1314 | { |
1315 | struct vmstorage_channel_properties props; | |
1316 | int ret; | |
1317 | ||
1318 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1319 | ||
adae1e93 | 1320 | device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
bf5fd8ca | 1321 | device->channel->next_request_id_callback = storvsc_next_request_id; |
453de21c | 1322 | |
8dcf37d4 S |
1323 | ret = vmbus_open(device->channel, |
1324 | ring_size, | |
1325 | ring_size, | |
1326 | (void *)&props, | |
1327 | sizeof(struct vmstorage_channel_properties), | |
6f94d5de | 1328 | storvsc_on_channel_callback, device->channel); |
8dcf37d4 S |
1329 | |
1330 | if (ret != 0) | |
1331 | return ret; | |
1332 | ||
dac58241 | 1333 | ret = storvsc_channel_init(device, is_fc); |
8dcf37d4 S |
1334 | |
1335 | return ret; | |
1336 | } | |
1337 | ||
c1b3d067 | 1338 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1339 | { |
1340 | struct storvsc_device *stor_device; | |
8dcf37d4 | 1341 | |
cd654ea1 | 1342 | stor_device = hv_get_drvdata(device); |
8dcf37d4 | 1343 | |
8dcf37d4 | 1344 | stor_device->destroy = true; |
2371cd90 SH |
1345 | |
1346 | /* Make sure flag is set before waiting */ | |
1347 | wmb(); | |
8dcf37d4 S |
1348 | |
1349 | /* | |
1350 | * At this point, all outbound traffic should be disable. We | |
1351 | * only allow inbound traffic (responses) to proceed so that | |
1352 | * outstanding requests can be completed. | |
1353 | */ | |
1354 | ||
1355 | storvsc_wait_to_drain(stor_device); | |
1356 | ||
1357 | /* | |
1358 | * Since we have already drained, we don't need to busy wait | |
1359 | * as was done in final_release_stor_device() | |
1360 | * Note that we cannot set the ext pointer to NULL until | |
1361 | * we have drained - to drain the outgoing packets, we need to | |
1362 | * allow incoming packets. | |
1363 | */ | |
cd654ea1 | 1364 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1365 | |
1366 | /* Close the channel */ | |
1367 | vmbus_close(device->channel); | |
1368 | ||
d86adf48 | 1369 | kfree(stor_device->stor_chns); |
8dcf37d4 S |
1370 | kfree(stor_device); |
1371 | return 0; | |
1372 | } | |
1373 | ||
d86adf48 S |
1374 | static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
1375 | u16 q_num) | |
1376 | { | |
1377 | u16 slot = 0; | |
1378 | u16 hash_qnum; | |
1b25a8c4 | 1379 | const struct cpumask *node_mask; |
d86adf48 S |
1380 | int num_channels, tgt_cpu; |
1381 | ||
7769e18c APM |
1382 | if (stor_device->num_sc == 0) { |
1383 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1384 | return stor_device->device->channel; |
7769e18c | 1385 | } |
d86adf48 S |
1386 | |
1387 | /* | |
1388 | * Our channel array is sparsley populated and we | |
1389 | * initiated I/O on a processor/hw-q that does not | |
1390 | * currently have a designated channel. Fix this. | |
1391 | * The strategy is simple: | |
1392 | * I. Ensure NUMA locality | |
1393 | * II. Distribute evenly (best effort) | |
d86adf48 S |
1394 | */ |
1395 | ||
1b25a8c4 | 1396 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
d86adf48 | 1397 | |
1b25a8c4 MK |
1398 | num_channels = 0; |
1399 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { | |
1400 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1401 | num_channels++; | |
1402 | } | |
7769e18c APM |
1403 | if (num_channels == 0) { |
1404 | stor_device->stor_chns[q_num] = stor_device->device->channel; | |
d86adf48 | 1405 | return stor_device->device->channel; |
7769e18c | 1406 | } |
d86adf48 S |
1407 | |
1408 | hash_qnum = q_num; | |
1409 | while (hash_qnum >= num_channels) | |
1410 | hash_qnum -= num_channels; | |
1411 | ||
1b25a8c4 MK |
1412 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1413 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1414 | continue; | |
d86adf48 S |
1415 | if (slot == hash_qnum) |
1416 | break; | |
1417 | slot++; | |
1418 | } | |
1419 | ||
1420 | stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; | |
1421 | ||
1422 | return stor_device->stor_chns[q_num]; | |
1423 | } | |
1424 | ||
1425 | ||
c1b3d067 | 1426 | static int storvsc_do_io(struct hv_device *device, |
d86adf48 | 1427 | struct storvsc_cmd_request *request, u16 q_num) |
8dcf37d4 S |
1428 | { |
1429 | struct storvsc_device *stor_device; | |
1430 | struct vstor_packet *vstor_packet; | |
2217a47d | 1431 | struct vmbus_channel *outgoing_channel, *channel; |
7769e18c | 1432 | unsigned long flags; |
8dcf37d4 | 1433 | int ret = 0; |
1b25a8c4 | 1434 | const struct cpumask *node_mask; |
d86adf48 | 1435 | int tgt_cpu; |
8dcf37d4 S |
1436 | |
1437 | vstor_packet = &request->vstor_packet; | |
1438 | stor_device = get_out_stor_device(device); | |
1439 | ||
1440 | if (!stor_device) | |
1441 | return -ENODEV; | |
1442 | ||
1443 | ||
1444 | request->device = device; | |
6f94d5de | 1445 | /* |
7769e18c | 1446 | * Select an appropriate channel to send the request out. |
6f94d5de | 1447 | */ |
7769e18c APM |
1448 | /* See storvsc_change_target_cpu(). */ |
1449 | outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); | |
1450 | if (outgoing_channel != NULL) { | |
2217a47d | 1451 | if (outgoing_channel->target_cpu == q_num) { |
d86adf48 S |
1452 | /* |
1453 | * Ideally, we want to pick a different channel if | |
1454 | * available on the same NUMA node. | |
1455 | */ | |
1b25a8c4 MK |
1456 | node_mask = cpumask_of_node(cpu_to_node(q_num)); |
1457 | for_each_cpu_wrap(tgt_cpu, | |
1458 | &stor_device->alloced_cpus, q_num + 1) { | |
1459 | if (!cpumask_test_cpu(tgt_cpu, node_mask)) | |
1460 | continue; | |
2217a47d LL |
1461 | if (tgt_cpu == q_num) |
1462 | continue; | |
7769e18c APM |
1463 | channel = READ_ONCE( |
1464 | stor_device->stor_chns[tgt_cpu]); | |
1465 | if (channel == NULL) | |
1466 | continue; | |
2217a47d LL |
1467 | if (hv_get_avail_to_write_percent( |
1468 | &channel->outbound) | |
1469 | > ring_avail_percent_lowater) { | |
1470 | outgoing_channel = channel; | |
1471 | goto found_channel; | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * All the other channels on the same NUMA node are | |
1477 | * busy. Try to use the channel on the current CPU | |
1478 | */ | |
1479 | if (hv_get_avail_to_write_percent( | |
1480 | &outgoing_channel->outbound) | |
1481 | > ring_avail_percent_lowater) | |
1482 | goto found_channel; | |
1483 | ||
1484 | /* | |
1485 | * If we reach here, all the channels on the current | |
1486 | * NUMA node are busy. Try to find a channel in | |
1487 | * other NUMA nodes | |
1488 | */ | |
1b25a8c4 MK |
1489 | for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
1490 | if (cpumask_test_cpu(tgt_cpu, node_mask)) | |
1491 | continue; | |
7769e18c APM |
1492 | channel = READ_ONCE( |
1493 | stor_device->stor_chns[tgt_cpu]); | |
1494 | if (channel == NULL) | |
1495 | continue; | |
2217a47d LL |
1496 | if (hv_get_avail_to_write_percent( |
1497 | &channel->outbound) | |
1498 | > ring_avail_percent_lowater) { | |
1499 | outgoing_channel = channel; | |
1500 | goto found_channel; | |
d86adf48 S |
1501 | } |
1502 | } | |
1503 | } | |
1504 | } else { | |
21d2052c | 1505 | spin_lock_irqsave(&stor_device->lock, flags); |
7769e18c APM |
1506 | outgoing_channel = stor_device->stor_chns[q_num]; |
1507 | if (outgoing_channel != NULL) { | |
21d2052c | 1508 | spin_unlock_irqrestore(&stor_device->lock, flags); |
7769e18c APM |
1509 | goto found_channel; |
1510 | } | |
d86adf48 | 1511 | outgoing_channel = get_og_chn(stor_device, q_num); |
21d2052c | 1512 | spin_unlock_irqrestore(&stor_device->lock, flags); |
d86adf48 | 1513 | } |
8dcf37d4 | 1514 | |
2217a47d | 1515 | found_channel: |
8dcf37d4 S |
1516 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
1517 | ||
86c8fb4d | 1518 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); |
8dcf37d4 S |
1519 | |
1520 | ||
86c8fb4d | 1521 | vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; |
8dcf37d4 S |
1522 | |
1523 | ||
1524 | vstor_packet->vm_srb.data_transfer_length = | |
be0cf6ca | 1525 | request->payload->range.len; |
8dcf37d4 S |
1526 | |
1527 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1528 | ||
be0cf6ca S |
1529 | if (request->payload->range.len) { |
1530 | ||
1531 | ret = vmbus_sendpacket_mpb_desc(outgoing_channel, | |
1532 | request->payload, request->payload_sz, | |
8dcf37d4 | 1533 | vstor_packet, |
86c8fb4d | 1534 | sizeof(struct vstor_packet), |
8dcf37d4 S |
1535 | (unsigned long)request); |
1536 | } else { | |
0147dabc | 1537 | ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
86c8fb4d | 1538 | sizeof(struct vstor_packet), |
8dcf37d4 S |
1539 | (unsigned long)request, |
1540 | VM_PKT_DATA_INBAND, | |
1541 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1542 | } | |
1543 | ||
1544 | if (ret != 0) | |
1545 | return ret; | |
1546 | ||
1547 | atomic_inc(&stor_device->num_outstanding_req); | |
1548 | ||
1549 | return ret; | |
1550 | } | |
1551 | ||
f1c635b4 SH |
1552 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1553 | { | |
1554 | /* | |
1555 | * Set blist flag to permit the reading of the VPD pages even when | |
1556 | * the target may claim SPC-2 compliance. MSFT targets currently | |
1557 | * claim SPC-2 compliance while they implement post SPC-2 features. | |
1558 | * With this flag we can correctly handle WRITE_SAME_16 issues. | |
1559 | * | |
1560 | * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but | |
1561 | * still supports REPORT LUN. | |
1562 | */ | |
1563 | sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | ||
419f2d03 S |
1568 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1569 | { | |
893def38 S |
1570 | blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
1571 | ||
31d16e71 MK |
1572 | /* storvsc devices don't support MAINTENANCE_IN SCSI cmd */ |
1573 | sdevice->no_report_opcodes = 1; | |
3e8f4f40 OH |
1574 | sdevice->no_write_same = 1; |
1575 | ||
b0a93d96 S |
1576 | /* |
1577 | * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 | |
b95f5be0 KM |
1578 | * if the device is a MSFT virtual device. If the host is |
1579 | * WIN10 or newer, allow write_same. | |
b0a93d96 S |
1580 | */ |
1581 | if (!strncmp(sdevice->vendor, "Msft", 4)) { | |
e6c4bc66 KM |
1582 | switch (vmstor_proto_version) { |
1583 | case VMSTOR_PROTO_VERSION_WIN8: | |
1584 | case VMSTOR_PROTO_VERSION_WIN8_1: | |
b0a93d96 S |
1585 | sdevice->scsi_level = SCSI_SPC_3; |
1586 | break; | |
1587 | } | |
b95f5be0 KM |
1588 | |
1589 | if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) | |
1590 | sdevice->no_write_same = 0; | |
b0a93d96 S |
1591 | } |
1592 | ||
419f2d03 S |
1593 | return 0; |
1594 | } | |
1595 | ||
62838ce2 S |
1596 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1597 | sector_t capacity, int *info) | |
1598 | { | |
5326fd5c S |
1599 | sector_t nsect = capacity; |
1600 | sector_t cylinders = nsect; | |
1601 | int heads, sectors_pt; | |
62838ce2 | 1602 | |
5326fd5c S |
1603 | /* |
1604 | * We are making up these values; let us keep it simple. | |
1605 | */ | |
1606 | heads = 0xff; | |
1607 | sectors_pt = 0x3f; /* Sectors per track */ | |
1608 | sector_div(cylinders, heads * sectors_pt); | |
1609 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1610 | cylinders = 0xffff; | |
62838ce2 S |
1611 | |
1612 | info[0] = heads; | |
5326fd5c S |
1613 | info[1] = sectors_pt; |
1614 | info[2] = (int)cylinders; | |
62838ce2 | 1615 | |
62838ce2 S |
1616 | return 0; |
1617 | } | |
aa3d789e | 1618 | |
4b270c8b | 1619 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1620 | { |
4b270c8b S |
1621 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1622 | struct hv_device *device = host_dev->dev; | |
1623 | ||
aa3d789e | 1624 | struct storvsc_device *stor_device; |
61eaffc9 | 1625 | struct storvsc_cmd_request *request; |
aa3d789e S |
1626 | struct vstor_packet *vstor_packet; |
1627 | int ret, t; | |
1628 | ||
1eaaddf9 | 1629 | stor_device = get_out_stor_device(device); |
aa3d789e | 1630 | if (!stor_device) |
a00e8224 | 1631 | return FAILED; |
aa3d789e S |
1632 | |
1633 | request = &stor_device->reset_request; | |
1634 | vstor_packet = &request->vstor_packet; | |
0a765665 | 1635 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
aa3d789e S |
1636 | |
1637 | init_completion(&request->wait_event); | |
1638 | ||
1639 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1640 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1641 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1642 | ||
1643 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
86c8fb4d | 1644 | sizeof(struct vstor_packet), |
bf5fd8ca | 1645 | VMBUS_RQST_RESET, |
aa3d789e S |
1646 | VM_PKT_DATA_INBAND, |
1647 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1648 | if (ret != 0) | |
a00e8224 | 1649 | return FAILED; |
aa3d789e | 1650 | |
46d2eb6d | 1651 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1652 | if (t == 0) |
1653 | return TIMEOUT_ERROR; | |
aa3d789e | 1654 | |
aa3d789e S |
1655 | |
1656 | /* | |
1657 | * At this point, all outstanding requests in the adapter | |
1658 | * should have been flushed out and return to us | |
5c1b10ab S |
1659 | * There is a potential race here where the host may be in |
1660 | * the process of responding when we return from here. | |
1661 | * Just wait for all in-transit packets to be accounted for | |
1662 | * before we return from here. | |
aa3d789e | 1663 | */ |
5c1b10ab | 1664 | storvsc_wait_to_drain(stor_device); |
aa3d789e | 1665 | |
a00e8224 | 1666 | return SUCCESS; |
aa3d789e S |
1667 | } |
1668 | ||
56b26e69 S |
1669 | /* |
1670 | * The host guarantees to respond to each command, although I/O latencies might | |
1671 | * be unbounded on Azure. Reset the timer unconditionally to give the host a | |
1672 | * chance to perform EH. | |
1673 | */ | |
dee7121e | 1674 | static enum scsi_timeout_action storvsc_eh_timed_out(struct scsi_cmnd *scmnd) |
56b26e69 | 1675 | { |
3930d730 LL |
1676 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1677 | if (scmnd->device->host->transportt == fc_transport_template) | |
1678 | return fc_eh_timed_out(scmnd); | |
1679 | #endif | |
dee7121e | 1680 | return SCSI_EH_RESET_TIMER; |
56b26e69 S |
1681 | } |
1682 | ||
c77b63b6 | 1683 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1684 | { |
1685 | bool allowed = true; | |
1686 | u8 scsi_op = scmnd->cmnd[0]; | |
1687 | ||
1688 | switch (scsi_op) { | |
3e8f4f40 OH |
1689 | /* the host does not handle WRITE_SAME, log accident usage */ |
1690 | case WRITE_SAME: | |
c77b63b6 S |
1691 | /* |
1692 | * smartd sends this command and the host does not handle | |
1693 | * this. So, don't send it. | |
1694 | */ | |
41098f8f | 1695 | case SET_WINDOW: |
d4674859 | 1696 | set_host_byte(scmnd, DID_ERROR); |
41098f8f S |
1697 | allowed = false; |
1698 | break; | |
1699 | default: | |
1700 | break; | |
92ae4ebd OH |
1701 | } |
1702 | return allowed; | |
1703 | } | |
c5b463ae | 1704 | |
bab445e1 | 1705 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1706 | { |
1707 | int ret; | |
bab445e1 | 1708 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1709 | struct hv_device *dev = host_dev->dev; |
ead3700d | 1710 | struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
c5b463ae | 1711 | struct scatterlist *sgl; |
c5b463ae | 1712 | struct vmscsi_request *vm_srb; |
be0cf6ca S |
1713 | struct vmbus_packet_mpb_array *payload; |
1714 | u32 payload_sz; | |
1715 | u32 length; | |
c5b463ae | 1716 | |
2492fd7a | 1717 | if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
8caf92d8 S |
1718 | /* |
1719 | * On legacy hosts filter unimplemented commands. | |
1720 | * Future hosts are expected to correctly handle | |
1721 | * unsupported commands. Furthermore, it is | |
1722 | * possible that some of the currently | |
1723 | * unsupported commands maybe supported in | |
1724 | * future versions of the host. | |
1725 | */ | |
1726 | if (!storvsc_scsi_cmd_ok(scmnd)) { | |
0c31fa0e | 1727 | scsi_done(scmnd); |
8caf92d8 S |
1728 | return 0; |
1729 | } | |
92ae4ebd | 1730 | } |
c5b463ae | 1731 | |
c5b463ae | 1732 | /* Setup the cmd request */ |
c5b463ae S |
1733 | cmd_request->cmd = scmnd; |
1734 | ||
0a765665 | 1735 | memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); |
61eaffc9 | 1736 | vm_srb = &cmd_request->vstor_packet.vm_srb; |
86c8fb4d | 1737 | vm_srb->time_out_value = 60; |
c5b463ae | 1738 | |
86c8fb4d | 1739 | vm_srb->srb_flags |= |
8cf308e1 | 1740 | SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
c5b463ae | 1741 | |
3cd6d3d9 | 1742 | if (scmnd->device->tagged_supported) { |
86c8fb4d | 1743 | vm_srb->srb_flags |= |
3cd6d3d9 | 1744 | (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); |
86c8fb4d SS |
1745 | vm_srb->queue_tag = SP_UNTAGGED; |
1746 | vm_srb->queue_action = SRB_SIMPLE_TAG_REQUEST; | |
3cd6d3d9 LL |
1747 | } |
1748 | ||
c5b463ae S |
1749 | /* Build the SRB */ |
1750 | switch (scmnd->sc_data_direction) { | |
1751 | case DMA_TO_DEVICE: | |
1752 | vm_srb->data_in = WRITE_TYPE; | |
86c8fb4d | 1753 | vm_srb->srb_flags |= SRB_FLAGS_DATA_OUT; |
c5b463ae S |
1754 | break; |
1755 | case DMA_FROM_DEVICE: | |
1756 | vm_srb->data_in = READ_TYPE; | |
86c8fb4d | 1757 | vm_srb->srb_flags |= SRB_FLAGS_DATA_IN; |
c5b463ae | 1758 | break; |
cb1cf080 | 1759 | case DMA_NONE: |
c5b463ae | 1760 | vm_srb->data_in = UNKNOWN_TYPE; |
86c8fb4d | 1761 | vm_srb->srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
c5b463ae | 1762 | break; |
cb1cf080 VK |
1763 | default: |
1764 | /* | |
1765 | * This is DMA_BIDIRECTIONAL or something else we are never | |
1766 | * supposed to see here. | |
1767 | */ | |
1768 | WARN(1, "Unexpected data direction: %d\n", | |
1769 | scmnd->sc_data_direction); | |
1770 | return -EINVAL; | |
c5b463ae S |
1771 | } |
1772 | ||
c5b463ae | 1773 | |
c5b463ae S |
1774 | vm_srb->port_number = host_dev->port; |
1775 | vm_srb->path_id = scmnd->device->channel; | |
1776 | vm_srb->target_id = scmnd->device->id; | |
1777 | vm_srb->lun = scmnd->device->lun; | |
1778 | ||
c5b463ae S |
1779 | vm_srb->cdb_length = scmnd->cmd_len; |
1780 | ||
1781 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1782 | ||
be0cf6ca | 1783 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
c5b463ae | 1784 | |
be0cf6ca S |
1785 | length = scsi_bufflen(scmnd); |
1786 | payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; | |
4e81a6cb | 1787 | payload_sz = 0; |
be0cf6ca | 1788 | |
0bd2fbee | 1789 | if (scsi_sg_count(scmnd)) { |
3d9c3dcc | 1790 | unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset); |
8f437105 | 1791 | unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); |
743b237c TL |
1792 | struct scatterlist *sg; |
1793 | unsigned long hvpfn, hvpfns_to_add; | |
0bd2fbee | 1794 | int j, i = 0, sg_count; |
be0cf6ca | 1795 | |
4e81a6cb MK |
1796 | payload_sz = (hvpg_count * sizeof(u64) + |
1797 | sizeof(struct vmbus_packet_mpb_array)); | |
8f437105 | 1798 | |
4e81a6cb | 1799 | if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { |
b0120d99 | 1800 | payload = kzalloc(payload_sz, GFP_ATOMIC); |
81988a0e VK |
1801 | if (!payload) |
1802 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
be0cf6ca S |
1803 | } |
1804 | ||
1805 | payload->range.len = length; | |
8f437105 | 1806 | payload->range.offset = offset_in_hvpg; |
be0cf6ca | 1807 | |
743b237c | 1808 | sg_count = scsi_dma_map(scmnd); |
4eea5332 JV |
1809 | if (sg_count < 0) { |
1810 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1811 | goto err_free_payload; | |
1812 | } | |
3d9c3dcc | 1813 | |
743b237c | 1814 | for_each_sg(sgl, sg, sg_count, j) { |
8f437105 | 1815 | /* |
743b237c TL |
1816 | * Init values for the current sgl entry. hvpfns_to_add |
1817 | * is in units of Hyper-V size pages. Handling the | |
1818 | * PAGE_SIZE != HV_HYP_PAGE_SIZE case also handles | |
1819 | * values of sgl->offset that are larger than PAGE_SIZE. | |
1820 | * Such offsets are handled even on other than the first | |
1821 | * sgl entry, provided they are a multiple of PAGE_SIZE. | |
8f437105 | 1822 | */ |
743b237c TL |
1823 | hvpfn = HVPFN_DOWN(sg_dma_address(sg)); |
1824 | hvpfns_to_add = HVPFN_UP(sg_dma_address(sg) + | |
1825 | sg_dma_len(sg)) - hvpfn; | |
8f437105 BF |
1826 | |
1827 | /* | |
3d9c3dcc MK |
1828 | * Fill the next portion of the PFN array with |
1829 | * sequential Hyper-V PFNs for the continguous physical | |
1830 | * memory described by the sgl entry. The end of the | |
1831 | * last sgl should be reached at the same time that | |
1832 | * the PFN array is filled. | |
8f437105 | 1833 | */ |
3d9c3dcc | 1834 | while (hvpfns_to_add--) |
743b237c | 1835 | payload->range.pfn_array[i++] = hvpfn++; |
aaced993 | 1836 | } |
c5b463ae S |
1837 | } |
1838 | ||
be0cf6ca S |
1839 | cmd_request->payload = payload; |
1840 | cmd_request->payload_sz = payload_sz; | |
1841 | ||
c5b463ae | 1842 | /* Invokes the vsc to start an IO */ |
d86adf48 S |
1843 | ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
1844 | put_cpu(); | |
636f0fd1 | 1845 | |
67ff3d0a MK |
1846 | if (ret) |
1847 | scsi_dma_unmap(scmnd); | |
1848 | ||
d2598f01 | 1849 | if (ret == -EAGAIN) { |
c5b463ae | 1850 | /* no more space */ |
4eea5332 JV |
1851 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1852 | goto err_free_payload; | |
c5b463ae S |
1853 | } |
1854 | ||
c77b63b6 | 1855 | return 0; |
4eea5332 JV |
1856 | |
1857 | err_free_payload: | |
1858 | if (payload_sz > sizeof(cmd_request->mpb)) | |
1859 | kfree(payload); | |
1860 | ||
1861 | return ret; | |
c5b463ae S |
1862 | } |
1863 | ||
bef4a34a | 1864 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1865 | .module = THIS_MODULE, |
1866 | .name = "storvsc_host_t", | |
ead3700d | 1867 | .cmd_size = sizeof(struct storvsc_cmd_request), |
ff568d3a GKH |
1868 | .bios_param = storvsc_get_chs, |
1869 | .queuecommand = storvsc_queuecommand, | |
1870 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
ead3700d | 1871 | .proc_name = "storvsc_host", |
56b26e69 | 1872 | .eh_timed_out = storvsc_eh_timed_out, |
f1c635b4 | 1873 | .slave_alloc = storvsc_device_alloc, |
ff568d3a | 1874 | .slave_configure = storvsc_device_configure, |
cabe92a5 | 1875 | .cmd_per_lun = 2048, |
ff568d3a | 1876 | .this_id = -1, |
83eed459 | 1877 | /* Ensure there are no gaps in presented sgls */ |
1d3e0980 | 1878 | .virt_boundary_mask = HV_HYP_PAGE_SIZE - 1, |
54b2b50c | 1879 | .no_write_same = 1, |
f64dad26 | 1880 | .track_queue_depth = 1, |
adfbd028 | 1881 | .change_queue_depth = storvsc_change_queue_depth, |
bef4a34a HJ |
1882 | }; |
1883 | ||
ef52a81b S |
1884 | enum { |
1885 | SCSI_GUID, | |
1886 | IDE_GUID, | |
bde6d0f9 | 1887 | SFC_GUID, |
ef52a81b S |
1888 | }; |
1889 | ||
d847b5fe | 1890 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 | 1891 | /* SCSI guid */ |
35c3bc20 S |
1892 | { HV_SCSI_GUID, |
1893 | .driver_data = SCSI_GUID | |
1894 | }, | |
21e37742 | 1895 | /* IDE guid */ |
35c3bc20 S |
1896 | { HV_IDE_GUID, |
1897 | .driver_data = IDE_GUID | |
1898 | }, | |
bde6d0f9 S |
1899 | /* Fibre Channel GUID */ |
1900 | { | |
1901 | HV_SYNTHFC_GUID, | |
1902 | .driver_data = SFC_GUID | |
1903 | }, | |
c45cf2d4 | 1904 | { }, |
d847b5fe | 1905 | }; |
bef4a34a | 1906 | |
d847b5fe | 1907 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1908 | |
56fb1058 DC |
1909 | static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; |
1910 | ||
1911 | static bool hv_dev_is_fc(struct hv_device *hv_dev) | |
1912 | { | |
1913 | return guid_equal(&fc_guid.guid, &hv_dev->dev_type); | |
1914 | } | |
1915 | ||
84946899 S |
1916 | static int storvsc_probe(struct hv_device *device, |
1917 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1918 | { |
ff568d3a | 1919 | int ret; |
f458aada | 1920 | int num_cpus = num_online_cpus(); |
a81a38cc | 1921 | int num_present_cpus = num_present_cpus(); |
bef4a34a | 1922 | struct Scsi_Host *host; |
795b613d | 1923 | struct hv_host_device *host_dev; |
ef52a81b | 1924 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
dac58241 | 1925 | bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
bd1f5d6a | 1926 | int target = 0; |
6e4198ce | 1927 | struct storvsc_device *stor_device; |
f458aada | 1928 | int max_sub_channels = 0; |
1d3e0980 | 1929 | u32 max_xfer_bytes; |
bd1f5d6a | 1930 | |
8b612fa2 | 1931 | /* |
106b98a5 MK |
1932 | * We support sub-channels for storage on SCSI and FC controllers. |
1933 | * The number of sub-channels offerred is based on the number of | |
1934 | * VCPUs in the guest. | |
8b612fa2 | 1935 | */ |
106b98a5 MK |
1936 | if (!dev_is_ide) |
1937 | max_sub_channels = | |
1938 | (num_cpus - 1) / storvsc_vcpus_per_sub_channel; | |
8b612fa2 | 1939 | |
2217a47d LL |
1940 | scsi_driver.can_queue = max_outstanding_req_per_channel * |
1941 | (max_sub_channels + 1) * | |
1942 | (100 - ring_avail_percent_lowater) / 100; | |
f458aada | 1943 | |
ff568d3a | 1944 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1945 | sizeof(struct hv_host_device)); |
f8feed06 | 1946 | if (!host) |
bef4a34a | 1947 | return -ENOMEM; |
bef4a34a | 1948 | |
7f33f30a | 1949 | host_dev = shost_priv(host); |
795b613d | 1950 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1951 | |
795b613d | 1952 | host_dev->port = host->host_no; |
97c15296 | 1953 | host_dev->dev = device; |
c58cc70f | 1954 | host_dev->host = host; |
bef4a34a | 1955 | |
4e03e697 | 1956 | |
a13d35ab | 1957 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1958 | if (!stor_device) { |
225ce6ea | 1959 | ret = -ENOMEM; |
ce3e301c | 1960 | goto err_out0; |
6e4198ce | 1961 | } |
9efd21e1 | 1962 | |
a13d35ab S |
1963 | stor_device->destroy = false; |
1964 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1965 | stor_device->device = device; | |
cd654ea1 | 1966 | stor_device->host = host; |
21d2052c | 1967 | spin_lock_init(&stor_device->lock); |
cd654ea1 | 1968 | hv_set_drvdata(device, stor_device); |
743b237c | 1969 | dma_set_min_align_mask(&device->device, HV_HYP_PAGE_SIZE - 1); |
a13d35ab | 1970 | |
6e4198ce | 1971 | stor_device->port_number = host->host_no; |
dac58241 | 1972 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
225ce6ea | 1973 | if (ret) |
ce3e301c | 1974 | goto err_out1; |
bef4a34a | 1975 | |
6e4198ce S |
1976 | host_dev->path = stor_device->path_id; |
1977 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1978 | |
4cd83ecd S |
1979 | switch (dev_id->driver_data) { |
1980 | case SFC_GUID: | |
1981 | host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; | |
1982 | host->max_id = STORVSC_FC_MAX_TARGETS; | |
1983 | host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; | |
dac58241 S |
1984 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
1985 | host->transportt = fc_transport_template; | |
1986 | #endif | |
4cd83ecd S |
1987 | break; |
1988 | ||
1989 | case SCSI_GUID: | |
106b98a5 MK |
1990 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; |
1991 | host->max_id = STORVSC_MAX_TARGETS; | |
1992 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
4cd83ecd S |
1993 | break; |
1994 | ||
1995 | default: | |
1996 | host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; | |
1997 | host->max_id = STORVSC_IDE_MAX_TARGETS; | |
1998 | host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; | |
1999 | break; | |
2000 | } | |
cf55f4a8 MS |
2001 | /* max cmd length */ |
2002 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
be0cf6ca | 2003 | /* |
1d3e0980 SS |
2004 | * Any reasonable Hyper-V configuration should provide |
2005 | * max_transfer_bytes value aligning to HV_HYP_PAGE_SIZE, | |
2006 | * protecting it from any weird value. | |
2007 | */ | |
2008 | max_xfer_bytes = round_down(stor_device->max_transfer_bytes, HV_HYP_PAGE_SIZE); | |
2009 | /* max_hw_sectors_kb */ | |
2010 | host->max_sectors = max_xfer_bytes >> 9; | |
2011 | /* | |
2012 | * There are 2 requirements for Hyper-V storvsc sgl segments, | |
2013 | * based on which the below calculation for max segments is | |
2014 | * done: | |
2015 | * | |
2016 | * 1. Except for the first and last sgl segment, all sgl segments | |
2017 | * should be align to HV_HYP_PAGE_SIZE, that also means the | |
2018 | * maximum number of segments in a sgl can be calculated by | |
2019 | * dividing the total max transfer length by HV_HYP_PAGE_SIZE. | |
2020 | * | |
2021 | * 2. Except for the first and last, each entry in the SGL must | |
2022 | * have an offset that is a multiple of HV_HYP_PAGE_SIZE. | |
be0cf6ca | 2023 | */ |
1d3e0980 | 2024 | host->sg_tablesize = (max_xfer_bytes >> HV_HYP_PAGE_SHIFT) + 1; |
d86adf48 | 2025 | /* |
7b571c19 | 2026 | * For non-IDE disks, the host supports multiple channels. |
d86adf48 S |
2027 | * Set the number of HW queues we are supporting. |
2028 | */ | |
a81a38cc MPM |
2029 | if (!dev_is_ide) { |
2030 | if (storvsc_max_hw_queues > num_present_cpus) { | |
2031 | storvsc_max_hw_queues = 0; | |
2032 | storvsc_log(device, STORVSC_LOGGING_WARN, | |
2033 | "Resetting invalid storvsc_max_hw_queues value to default.\n"); | |
2034 | } | |
2035 | if (storvsc_max_hw_queues) | |
2036 | host->nr_hw_queues = storvsc_max_hw_queues; | |
2037 | else | |
2038 | host->nr_hw_queues = num_present_cpus; | |
2039 | } | |
be0cf6ca | 2040 | |
436ad941 CA |
2041 | /* |
2042 | * Set the error handler work queue. | |
2043 | */ | |
2044 | host_dev->handle_error_wq = | |
2045 | alloc_ordered_workqueue("storvsc_error_wq_%d", | |
d957e7ff | 2046 | 0, |
436ad941 | 2047 | host->host_no); |
6112ff4e JX |
2048 | if (!host_dev->handle_error_wq) { |
2049 | ret = -ENOMEM; | |
436ad941 | 2050 | goto err_out2; |
6112ff4e | 2051 | } |
c58cc70f | 2052 | INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); |
454f18a9 | 2053 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 2054 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 2055 | if (ret != 0) |
436ad941 | 2056 | goto err_out3; |
bef4a34a | 2057 | |
bd1f5d6a S |
2058 | if (!dev_is_ide) { |
2059 | scsi_scan_host(host); | |
59d22950 S |
2060 | } else { |
2061 | target = (device->dev_instance.b[5] << 8 | | |
2062 | device->dev_instance.b[4]); | |
2063 | ret = scsi_add_device(host, 0, target, 0); | |
daf0cd44 | 2064 | if (ret) |
436ad941 | 2065 | goto err_out4; |
bef4a34a | 2066 | } |
dac58241 S |
2067 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2068 | if (host->transportt == fc_transport_template) { | |
daf0cd44 CA |
2069 | struct fc_rport_identifiers ids = { |
2070 | .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, | |
2071 | }; | |
2072 | ||
dac58241 S |
2073 | fc_host_node_name(host) = stor_device->node_name; |
2074 | fc_host_port_name(host) = stor_device->port_name; | |
daf0cd44 | 2075 | stor_device->rport = fc_remote_port_add(host, 0, &ids); |
ca8dc694 DC |
2076 | if (!stor_device->rport) { |
2077 | ret = -ENOMEM; | |
436ad941 | 2078 | goto err_out4; |
ca8dc694 | 2079 | } |
dac58241 S |
2080 | } |
2081 | #endif | |
bd1f5d6a | 2082 | return 0; |
bef4a34a | 2083 | |
436ad941 | 2084 | err_out4: |
daf0cd44 CA |
2085 | scsi_remove_host(host); |
2086 | ||
436ad941 CA |
2087 | err_out3: |
2088 | destroy_workqueue(host_dev->handle_error_wq); | |
2089 | ||
ce3e301c | 2090 | err_out2: |
225ce6ea S |
2091 | /* |
2092 | * Once we have connected with the host, we would need to | |
635b241d | 2093 | * invoke storvsc_dev_remove() to rollback this state and |
225ce6ea | 2094 | * this call also frees up the stor_device; hence the jump around |
ce3e301c | 2095 | * err_out1 label. |
225ce6ea | 2096 | */ |
bd1f5d6a | 2097 | storvsc_dev_remove(device); |
ce3e301c | 2098 | goto err_out0; |
225ce6ea S |
2099 | |
2100 | err_out1: | |
d86adf48 | 2101 | kfree(stor_device->stor_chns); |
ce3e301c | 2102 | kfree(stor_device); |
225ce6ea S |
2103 | |
2104 | err_out0: | |
bd1f5d6a | 2105 | scsi_host_put(host); |
225ce6ea | 2106 | return ret; |
bef4a34a HJ |
2107 | } |
2108 | ||
adfbd028 BB |
2109 | /* Change a scsi target's queue depth */ |
2110 | static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) | |
2111 | { | |
2112 | if (queue_depth > scsi_driver.can_queue) | |
2113 | queue_depth = scsi_driver.can_queue; | |
2114 | ||
2115 | return scsi_change_queue_depth(sdev, queue_depth); | |
2116 | } | |
2117 | ||
96ec2939 | 2118 | static void storvsc_remove(struct hv_device *dev) |
ddcbf65e S |
2119 | { |
2120 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
2121 | struct Scsi_Host *host = stor_device->host; | |
436ad941 | 2122 | struct hv_host_device *host_dev = shost_priv(host); |
ddcbf65e | 2123 | |
dac58241 | 2124 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
daf0cd44 CA |
2125 | if (host->transportt == fc_transport_template) { |
2126 | fc_remote_port_delete(stor_device->rport); | |
dac58241 | 2127 | fc_remove_host(host); |
daf0cd44 | 2128 | } |
dac58241 | 2129 | #endif |
436ad941 | 2130 | destroy_workqueue(host_dev->handle_error_wq); |
ddcbf65e S |
2131 | scsi_remove_host(host); |
2132 | storvsc_dev_remove(dev); | |
2133 | scsi_host_put(host); | |
ddcbf65e S |
2134 | } |
2135 | ||
56fb1058 DC |
2136 | static int storvsc_suspend(struct hv_device *hv_dev) |
2137 | { | |
2138 | struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); | |
2139 | struct Scsi_Host *host = stor_device->host; | |
2140 | struct hv_host_device *host_dev = shost_priv(host); | |
2141 | ||
2142 | storvsc_wait_to_drain(stor_device); | |
2143 | ||
2144 | drain_workqueue(host_dev->handle_error_wq); | |
2145 | ||
2146 | vmbus_close(hv_dev->channel); | |
2147 | ||
56fb1058 DC |
2148 | kfree(stor_device->stor_chns); |
2149 | stor_device->stor_chns = NULL; | |
2150 | ||
2151 | cpumask_clear(&stor_device->alloced_cpus); | |
2152 | ||
2153 | return 0; | |
2154 | } | |
2155 | ||
2156 | static int storvsc_resume(struct hv_device *hv_dev) | |
2157 | { | |
2158 | int ret; | |
2159 | ||
2160 | ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, | |
2161 | hv_dev_is_fc(hv_dev)); | |
2162 | return ret; | |
2163 | } | |
2164 | ||
40bf63ed | 2165 | static struct hv_driver storvsc_drv = { |
fafb0efc | 2166 | .name = KBUILD_MODNAME, |
d847b5fe | 2167 | .id_table = id_table, |
40bf63ed S |
2168 | .probe = storvsc_probe, |
2169 | .remove = storvsc_remove, | |
56fb1058 DC |
2170 | .suspend = storvsc_suspend, |
2171 | .resume = storvsc_resume, | |
af0a5646 AV |
2172 | .driver = { |
2173 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
2174 | }, | |
39ae6fae | 2175 | }; |
7bd05b91 | 2176 | |
dac58241 S |
2177 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2178 | static struct fc_function_template fc_transport_functions = { | |
2179 | .show_host_node_name = 1, | |
2180 | .show_host_port_name = 1, | |
2181 | }; | |
2182 | #endif | |
2183 | ||
d9bbae83 | 2184 | static int __init storvsc_drv_init(void) |
f5c78872 | 2185 | { |
dac58241 | 2186 | int ret; |
01415ab3 S |
2187 | |
2188 | /* | |
2189 | * Divide the ring buffer data size (which is 1 page less | |
2190 | * than the ring buffer size since that page is reserved for | |
2191 | * the ring buffer indices) by the max request size (which is | |
2192 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
2193 | */ | |
01415ab3 | 2194 | max_outstanding_req_per_channel = |
768fa219 GKH |
2195 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
2196 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
ab548fd2 | 2197 | sizeof(struct vstor_packet) + sizeof(u64), |
768fa219 | 2198 | sizeof(u64))); |
f5c78872 | 2199 | |
dac58241 S |
2200 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2201 | fc_transport_template = fc_attach_transport(&fc_transport_functions); | |
2202 | if (!fc_transport_template) | |
2203 | return -ENODEV; | |
2204 | #endif | |
2205 | ||
2206 | ret = vmbus_driver_register(&storvsc_drv); | |
2207 | ||
2208 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) | |
2209 | if (ret) | |
2210 | fc_release_transport(fc_transport_template); | |
2211 | #endif | |
2212 | ||
2213 | return ret; | |
f5c78872 S |
2214 | } |
2215 | ||
c63ba9e1 | 2216 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 2217 | { |
768fa219 | 2218 | vmbus_driver_unregister(&storvsc_drv); |
dac58241 S |
2219 | #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
2220 | fc_release_transport(fc_transport_template); | |
2221 | #endif | |
f5c78872 S |
2222 | } |
2223 | ||
ff568d3a | 2224 | MODULE_LICENSE("GPL"); |
3afc7cc3 | 2225 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 2226 | module_init(storvsc_drv_init); |
c63ba9e1 | 2227 | module_exit(storvsc_drv_exit); |