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Hank Janssenbef4a342009-07-13 16:01:31 -07001/*
Hank Janssenbef4a342009-07-13 16:01:31 -07002 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
K. Y. Srinivasan972621c2011-05-10 07:54:19 -070020 * K. Y. Srinivasan <kys@microsoft.com>
Hank Janssenbef4a342009-07-13 16:01:31 -070021 */
K. Y. Srinivasana1be1702011-08-27 11:31:23 -070022
23#include <linux/kernel.h>
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070024#include <linux/wait.h>
K. Y. Srinivasana1be1702011-08-27 11:31:23 -070025#include <linux/sched.h>
26#include <linux/completion.h>
27#include <linux/string.h>
28#include <linux/mm.h>
29#include <linux/delay.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070030#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070032#include <linux/module.h>
33#include <linux/device.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070034#include <linux/hyperv.h>
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -080035#include <linux/mempool.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070036#include <scsi/scsi.h>
37#include <scsi/scsi_cmnd.h>
38#include <scsi/scsi_host.h>
39#include <scsi/scsi_device.h>
40#include <scsi/scsi_tcq.h>
41#include <scsi/scsi_eh.h>
42#include <scsi/scsi_devinfo.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070043#include <scsi/scsi_dbg.h>
K. Y. Srinivasan3f335ea2011-05-12 19:34:15 -070044
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080045/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -080046 * All wire protocol details (storage protocol between the guest and the host)
47 * are consolidated here.
48 *
49 * Begin protocol definitions.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080050 */
51
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080052/*
53 * Version history:
54 * V1 Beta: 0.1
55 * V1 RC < 2008/1/31: 1.0
56 * V1 RC > 2008/1/31: 2.0
57 * Win7: 4.2
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070058 * Win8: 5.1
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080059 */
60
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070061
62#define VMSTOR_WIN7_MAJOR 4
63#define VMSTOR_WIN7_MINOR 2
64
65#define VMSTOR_WIN8_MAJOR 5
66#define VMSTOR_WIN8_MINOR 1
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070067
68
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070069/* Packet structure describing virtual storage requests. */
70enum vstor_packet_operation {
71 VSTOR_OPERATION_COMPLETE_IO = 1,
72 VSTOR_OPERATION_REMOVE_DEVICE = 2,
73 VSTOR_OPERATION_EXECUTE_SRB = 3,
74 VSTOR_OPERATION_RESET_LUN = 4,
75 VSTOR_OPERATION_RESET_ADAPTER = 5,
76 VSTOR_OPERATION_RESET_BUS = 6,
77 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
78 VSTOR_OPERATION_END_INITIALIZATION = 8,
79 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
80 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
K. Y. Srinivasan2b9525f2011-11-08 09:01:48 -080081 VSTOR_OPERATION_ENUMERATE_BUS = 11,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070082 VSTOR_OPERATION_FCHBA_DATA = 12,
83 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
84 VSTOR_OPERATION_MAXIMUM = 13
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070085};
86
87/*
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070088 * WWN packet for Fibre Channel HBA
89 */
90
91struct hv_fc_wwn_packet {
92 bool primary_active;
93 u8 reserved1;
94 u8 reserved2;
95 u8 primary_port_wwn[8];
96 u8 primary_node_wwn[8];
97 u8 secondary_port_wwn[8];
98 u8 secondary_node_wwn[8];
99};
100
101
102
103/*
104 * SRB Flag Bits
105 */
106
107#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
108#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
109#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
110#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
111#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
112#define SRB_FLAGS_DATA_IN 0x00000040
113#define SRB_FLAGS_DATA_OUT 0x00000080
114#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
115#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
116#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
117#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
118#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
119
120/*
121 * This flag indicates the request is part of the workflow for processing a D3.
122 */
123#define SRB_FLAGS_D3_PROCESSING 0x00000800
124#define SRB_FLAGS_IS_ACTIVE 0x00010000
125#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
126#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
127#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
128#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
129#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
130#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
131#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
132#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
133#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
134
135
136/*
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700137 * Platform neutral description of a scsi request -
138 * this remains the same across the write regardless of 32/64 bit
139 * note: it's patterned off the SCSI_PASS_THROUGH structure
140 */
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800141#define STORVSC_MAX_CMD_LEN 0x10
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700142
143#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
144#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
145
146#define STORVSC_SENSE_BUFFER_SIZE 0x14
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800147#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700148
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700149/*
150 * Sense buffer size changed in win8; have a run-time
151 * variable to track the size we should use.
152 */
153static int sense_buffer_size;
154
155/*
156 * The size of the vmscsi_request has changed in win8. The
157 * additional size is because of new elements added to the
158 * structure. These elements are valid only when we are talking
159 * to a win8 host.
160 * Track the correction to size we need to apply.
161 */
162
163static int vmscsi_size_delta;
164static int vmstor_current_major;
165static int vmstor_current_minor;
166
167struct vmscsi_win8_extension {
168 /*
169 * The following were added in Windows 8
170 */
171 u16 reserve;
172 u8 queue_tag;
173 u8 queue_action;
174 u32 srb_flags;
175 u32 time_out_value;
176 u32 queue_sort_ey;
177} __packed;
178
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700179struct vmscsi_request {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800180 u16 length;
181 u8 srb_status;
182 u8 scsi_status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700183
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800184 u8 port_number;
185 u8 path_id;
186 u8 target_id;
187 u8 lun;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700188
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800189 u8 cdb_length;
190 u8 sense_info_length;
191 u8 data_in;
192 u8 reserved;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700193
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800194 u32 data_transfer_length;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700195
196 union {
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800197 u8 cdb[STORVSC_MAX_CMD_LEN];
198 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
199 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700200 };
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700201 /*
202 * The following was added in win8.
203 */
204 struct vmscsi_win8_extension win8_extension;
205
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700206} __attribute((packed));
207
208
209/*
210 * This structure is sent during the intialization phase to get the different
211 * properties of the channel.
212 */
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700213
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700214#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
215
216struct vmstorage_channel_properties {
217 u32 reserved;
218 u16 max_channel_cnt;
219 u16 reserved1;
220
221 u32 flags;
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800222 u32 max_transfer_bytes;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700223
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700224 u64 reserved2;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700225} __packed;
226
227/* This structure is sent during the storage protocol negotiations. */
228struct vmstorage_protocol_version {
229 /* Major (MSW) and minor (LSW) version numbers. */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800230 u16 major_minor;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700231
232 /*
233 * Revision number is auto-incremented whenever this file is changed
234 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
235 * definitely indicate incompatibility--but it does indicate mismatched
236 * builds.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800237 * This is only used on the windows side. Just set it to 0.
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700238 */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800239 u16 revision;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700240} __packed;
241
242/* Channel Property Flags */
243#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
244#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
245
246struct vstor_packet {
247 /* Requested operation type */
248 enum vstor_packet_operation operation;
249
250 /* Flags - see below for values */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800251 u32 flags;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700252
253 /* Status of the request returned from the server side. */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800254 u32 status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700255
256 /* Data payload area */
257 union {
258 /*
259 * Structure used to forward SCSI commands from the
260 * client to the server.
261 */
262 struct vmscsi_request vm_srb;
263
264 /* Structure used to query channel properties. */
265 struct vmstorage_channel_properties storage_channel_properties;
266
267 /* Used during version negotiations. */
268 struct vmstorage_protocol_version version;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700269
270 /* Fibre channel address packet */
271 struct hv_fc_wwn_packet wwn_packet;
272
273 /* Number of sub-channels to create */
274 u16 sub_channel_count;
275
276 /* This will be the maximum of the union members */
277 u8 buffer[0x34];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700278 };
279} __packed;
280
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700281/*
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800282 * Packet Flags:
283 *
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700284 * This flag indicates that the server should send back a completion for this
285 * packet.
286 */
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800287
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700288#define REQUEST_COMPLETION_FLAG 0x1
289
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700290/* Matches Windows-end */
291enum storvsc_request_type {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800292 WRITE_TYPE = 0,
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700293 READ_TYPE,
294 UNKNOWN_TYPE,
295};
296
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800297/*
298 * SRB status codes and masks; a subset of the codes used here.
299 */
300
301#define SRB_STATUS_AUTOSENSE_VALID 0x80
302#define SRB_STATUS_INVALID_LUN 0x20
303#define SRB_STATUS_SUCCESS 0x01
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800304#define SRB_STATUS_ABORTED 0x02
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800305#define SRB_STATUS_ERROR 0x04
306
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800307/*
308 * This is the end of Protocol specific defines.
309 */
310
311
312/*
313 * We setup a mempool to allocate request structures for this driver
314 * on a per-lun basis. The following define specifies the number of
315 * elements in the pool.
316 */
317
318#define STORVSC_MIN_BUF_NR 64
319static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
320
321module_param(storvsc_ringbuffer_size, int, S_IRUGO);
322MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
323
K. Y. Srinivasan893def32013-06-04 12:05:05 -0700324/*
325 * Timeout in seconds for all devices managed by this driver.
326 */
327static int storvsc_timeout = 180;
328
K. Y. Srinivasanbb6a4df2013-06-04 12:05:09 -0700329#define STORVSC_MAX_IO_REQUESTS 200
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800330
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700331static void storvsc_on_channel_callback(void *context);
332
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800333/*
334 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
335 * reality, the path/target is not used (ie always set to 0) so our
336 * scsi host adapter essentially has 1 bus with 1 target that contains
337 * up to 256 luns.
338 */
339#define STORVSC_MAX_LUNS_PER_TARGET 64
340#define STORVSC_MAX_TARGETS 1
341#define STORVSC_MAX_CHANNELS 1
342
343
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800344
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800345struct storvsc_cmd_request {
346 struct list_head entry;
347 struct scsi_cmnd *cmd;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700348
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800349 unsigned int bounce_sgl_count;
350 struct scatterlist *bounce_sgl;
351
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700352 struct hv_device *device;
353
354 /* Synchronize the request/response if needed */
355 struct completion wait_event;
356
357 unsigned char *sense_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700358 struct hv_multipage_buffer data_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700359 struct vstor_packet vstor_packet;
360};
361
362
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700363/* A storvsc device is a device object that contains a vmbus channel */
364struct storvsc_device {
365 struct hv_device *device;
366
367 bool destroy;
368 bool drain_notify;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700369 bool open_sub_channel;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700370 atomic_t num_outstanding_req;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700371 struct Scsi_Host *host;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700372
373 wait_queue_head_t waiting_to_drain;
374
375 /*
376 * Each unique Port/Path/Target represents 1 channel ie scsi
377 * controller. In reality, the pathid, targetid is always 0
378 * and the port is set by us
379 */
380 unsigned int port_number;
381 unsigned char path_id;
382 unsigned char target_id;
383
384 /* Used for vsc/vsp channel reset process */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800385 struct storvsc_cmd_request init_request;
386 struct storvsc_cmd_request reset_request;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700387};
388
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800389struct stor_mem_pools {
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700390 struct kmem_cache *request_pool;
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -0800391 mempool_t *request_mempool;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800392};
393
394struct hv_host_device {
395 struct hv_device *dev;
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700396 unsigned int port;
397 unsigned char path;
398 unsigned char target;
399};
400
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800401struct storvsc_scan_work {
402 struct work_struct work;
403 struct Scsi_Host *host;
404 uint lun;
405};
406
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800407static void storvsc_device_scan(struct work_struct *work)
408{
409 struct storvsc_scan_work *wrk;
410 uint lun;
411 struct scsi_device *sdev;
412
413 wrk = container_of(work, struct storvsc_scan_work, work);
414 lun = wrk->lun;
415
416 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
417 if (!sdev)
418 goto done;
419 scsi_rescan_device(&sdev->sdev_gendev);
420 scsi_device_put(sdev);
421
422done:
423 kfree(wrk);
424}
425
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800426static void storvsc_bus_scan(struct work_struct *work)
427{
428 struct storvsc_scan_work *wrk;
429 int id, order_id;
430
431 wrk = container_of(work, struct storvsc_scan_work, work);
432 for (id = 0; id < wrk->host->max_id; ++id) {
433 if (wrk->host->reverse_ordering)
434 order_id = wrk->host->max_id - id - 1;
435 else
436 order_id = id;
437
438 scsi_scan_target(&wrk->host->shost_gendev, 0,
439 order_id, SCAN_WILD_CARD, 1);
440 }
441 kfree(wrk);
442}
443
K. Y. Srinivasanb4017312011-11-08 09:01:50 -0800444static void storvsc_remove_lun(struct work_struct *work)
445{
446 struct storvsc_scan_work *wrk;
447 struct scsi_device *sdev;
448
449 wrk = container_of(work, struct storvsc_scan_work, work);
450 if (!scsi_host_get(wrk->host))
451 goto done;
452
453 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
454
455 if (sdev) {
456 scsi_remove_device(sdev);
457 scsi_device_put(sdev);
458 }
459 scsi_host_put(wrk->host);
460
461done:
462 kfree(wrk);
463}
464
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800465/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800466 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
467 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
468 */
469
470static inline u16 storvsc_get_version(u8 major, u8 minor)
471{
472 u16 version;
473
474 version = ((major << 8) | minor);
475 return version;
476}
477
478/*
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800479 * We can get incoming messages from the host that are not in response to
480 * messages that we have sent out. An example of this would be messages
481 * received by the guest to notify dynamic addition/removal of LUNs. To
482 * deal with potential race conditions where the driver may be in the
483 * midst of being unloaded when we might receive an unsolicited message
484 * from the host, we have implemented a mechanism to gurantee sequential
485 * consistency:
486 *
487 * 1) Once the device is marked as being destroyed, we will fail all
488 * outgoing messages.
489 * 2) We permit incoming messages when the device is being destroyed,
490 * only to properly account for messages already sent out.
491 */
492
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700493static inline struct storvsc_device *get_out_stor_device(
494 struct hv_device *device)
495{
496 struct storvsc_device *stor_device;
497
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700498 stor_device = hv_get_drvdata(device);
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700499
500 if (stor_device && stor_device->destroy)
501 stor_device = NULL;
502
503 return stor_device;
504}
505
506
507static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
508{
509 dev->drain_notify = true;
510 wait_event(dev->waiting_to_drain,
511 atomic_read(&dev->num_outstanding_req) == 0);
512 dev->drain_notify = false;
513}
Hank Janssenbef4a342009-07-13 16:01:31 -0700514
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700515static inline struct storvsc_device *get_in_stor_device(
516 struct hv_device *device)
517{
518 struct storvsc_device *stor_device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700519
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700520 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700521
522 if (!stor_device)
523 goto get_in_err;
524
525 /*
526 * If the device is being destroyed; allow incoming
527 * traffic only to cleanup outstanding requests.
528 */
529
530 if (stor_device->destroy &&
531 (atomic_read(&stor_device->num_outstanding_req) == 0))
532 stor_device = NULL;
533
534get_in_err:
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700535 return stor_device;
536
537}
538
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800539static void destroy_bounce_buffer(struct scatterlist *sgl,
540 unsigned int sg_count)
541{
542 int i;
543 struct page *page_buf;
544
545 for (i = 0; i < sg_count; i++) {
546 page_buf = sg_page((&sgl[i]));
547 if (page_buf != NULL)
548 __free_page(page_buf);
549 }
550
551 kfree(sgl);
552}
553
554static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
555{
556 int i;
557
558 /* No need to check */
559 if (sg_count < 2)
560 return -1;
561
562 /* We have at least 2 sg entries */
563 for (i = 0; i < sg_count; i++) {
564 if (i == 0) {
565 /* make sure 1st one does not have hole */
566 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
567 return i;
568 } else if (i == sg_count - 1) {
569 /* make sure last one does not have hole */
570 if (sgl[i].offset != 0)
571 return i;
572 } else {
573 /* make sure no hole in the middle */
574 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
575 return i;
576 }
577 }
578 return -1;
579}
580
581static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
582 unsigned int sg_count,
583 unsigned int len,
584 int write)
585{
586 int i;
587 int num_pages;
588 struct scatterlist *bounce_sgl;
589 struct page *page_buf;
590 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
591
592 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
593
594 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
595 if (!bounce_sgl)
596 return NULL;
597
K. Y. Srinivasan9d2696e2013-02-06 05:15:28 -0800598 sg_init_table(bounce_sgl, num_pages);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800599 for (i = 0; i < num_pages; i++) {
600 page_buf = alloc_page(GFP_ATOMIC);
601 if (!page_buf)
602 goto cleanup;
603 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
604 }
605
606 return bounce_sgl;
607
608cleanup:
609 destroy_bounce_buffer(bounce_sgl, num_pages);
610 return NULL;
611}
612
Linus Torvalds9f393832012-03-21 09:40:26 -0700613/* Disgusting wrapper functions */
614static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
615{
616 void *addr = kmap_atomic(sg_page(sgl + idx));
617 return (unsigned long)addr;
618}
619
620static inline void sg_kunmap_atomic(unsigned long addr)
621{
622 kunmap_atomic((void *)addr);
623}
624
625
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800626/* Assume the original sgl has enough room */
627static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
628 struct scatterlist *bounce_sgl,
629 unsigned int orig_sgl_count,
630 unsigned int bounce_sgl_count)
631{
632 int i;
633 int j = 0;
634 unsigned long src, dest;
635 unsigned int srclen, destlen, copylen;
636 unsigned int total_copied = 0;
637 unsigned long bounce_addr = 0;
638 unsigned long dest_addr = 0;
639 unsigned long flags;
640
641 local_irq_save(flags);
642
643 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700644 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800645 dest = dest_addr;
646 destlen = orig_sgl[i].length;
647
648 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700649 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800650
651 while (destlen) {
652 src = bounce_addr + bounce_sgl[j].offset;
653 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
654
655 copylen = min(srclen, destlen);
656 memcpy((void *)dest, (void *)src, copylen);
657
658 total_copied += copylen;
659 bounce_sgl[j].offset += copylen;
660 destlen -= copylen;
661 dest += copylen;
662
663 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
664 /* full */
Linus Torvalds9f393832012-03-21 09:40:26 -0700665 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800666 j++;
667
668 /*
669 * It is possible that the number of elements
670 * in the bounce buffer may not be equal to
671 * the number of elements in the original
672 * scatter list. Handle this correctly.
673 */
674
675 if (j == bounce_sgl_count) {
676 /*
677 * We are done; cleanup and return.
678 */
Linus Torvalds9f393832012-03-21 09:40:26 -0700679 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800680 local_irq_restore(flags);
681 return total_copied;
682 }
683
684 /* if we need to use another bounce buffer */
685 if (destlen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700686 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800687 } else if (destlen == 0 && i == orig_sgl_count - 1) {
688 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700689 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800690 }
691 }
692
Linus Torvalds9f393832012-03-21 09:40:26 -0700693 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800694 }
695
696 local_irq_restore(flags);
697
698 return total_copied;
699}
700
701/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
702static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
703 struct scatterlist *bounce_sgl,
704 unsigned int orig_sgl_count)
705{
706 int i;
707 int j = 0;
708 unsigned long src, dest;
709 unsigned int srclen, destlen, copylen;
710 unsigned int total_copied = 0;
711 unsigned long bounce_addr = 0;
712 unsigned long src_addr = 0;
713 unsigned long flags;
714
715 local_irq_save(flags);
716
717 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700718 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800719 src = src_addr;
720 srclen = orig_sgl[i].length;
721
722 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700723 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800724
725 while (srclen) {
726 /* assume bounce offset always == 0 */
727 dest = bounce_addr + bounce_sgl[j].length;
728 destlen = PAGE_SIZE - bounce_sgl[j].length;
729
730 copylen = min(srclen, destlen);
731 memcpy((void *)dest, (void *)src, copylen);
732
733 total_copied += copylen;
734 bounce_sgl[j].length += copylen;
735 srclen -= copylen;
736 src += copylen;
737
738 if (bounce_sgl[j].length == PAGE_SIZE) {
739 /* full..move to next entry */
Linus Torvalds9f393832012-03-21 09:40:26 -0700740 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800741 j++;
742
743 /* if we need to use another bounce buffer */
744 if (srclen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700745 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800746
747 } else if (srclen == 0 && i == orig_sgl_count - 1) {
748 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700749 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800750 }
751 }
752
Linus Torvalds9f393832012-03-21 09:40:26 -0700753 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800754 }
755
756 local_irq_restore(flags);
757
758 return total_copied;
759}
760
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700761static void handle_sc_creation(struct vmbus_channel *new_sc)
762{
763 struct hv_device *device = new_sc->primary_channel->device_obj;
764 struct storvsc_device *stor_device;
765 struct vmstorage_channel_properties props;
766
767 stor_device = get_out_stor_device(device);
768 if (!stor_device)
769 return;
770
771 if (stor_device->open_sub_channel == false)
772 return;
773
774 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
775
776 vmbus_open(new_sc,
777 storvsc_ringbuffer_size,
778 storvsc_ringbuffer_size,
779 (void *)&props,
780 sizeof(struct vmstorage_channel_properties),
781 storvsc_on_channel_callback, new_sc);
782}
783
784static void handle_multichannel_storage(struct hv_device *device, int max_chns)
785{
786 struct storvsc_device *stor_device;
787 int num_cpus = num_online_cpus();
788 int num_sc;
789 struct storvsc_cmd_request *request;
790 struct vstor_packet *vstor_packet;
791 int ret, t;
792
793 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
794 stor_device = get_out_stor_device(device);
795 if (!stor_device)
796 return;
797
798 request = &stor_device->init_request;
799 vstor_packet = &request->vstor_packet;
800
801 stor_device->open_sub_channel = true;
802 /*
803 * Establish a handler for dealing with subchannels.
804 */
805 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
806
807 /*
808 * Check to see if sub-channels have already been created. This
809 * can happen when this driver is re-loaded after unloading.
810 */
811
812 if (vmbus_are_subchannels_present(device->channel))
813 return;
814
815 stor_device->open_sub_channel = false;
816 /*
817 * Request the host to create sub-channels.
818 */
819 memset(request, 0, sizeof(struct storvsc_cmd_request));
820 init_completion(&request->wait_event);
821 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
822 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
823 vstor_packet->sub_channel_count = num_sc;
824
825 ret = vmbus_sendpacket(device->channel, vstor_packet,
826 (sizeof(struct vstor_packet) -
827 vmscsi_size_delta),
828 (unsigned long)request,
829 VM_PKT_DATA_INBAND,
830 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
831
832 if (ret != 0)
833 return;
834
835 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
836 if (t == 0)
837 return;
838
839 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
840 vstor_packet->status != 0)
841 return;
842
843 /*
844 * Now that we created the sub-channels, invoke the check; this
845 * may trigger the callback.
846 */
847 stor_device->open_sub_channel = true;
848 vmbus_are_subchannels_present(device->channel);
849}
850
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700851static int storvsc_channel_init(struct hv_device *device)
852{
853 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800854 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700855 struct vstor_packet *vstor_packet;
856 int ret, t;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700857 int max_chns;
858 bool process_sub_channels = false;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700859
860 stor_device = get_out_stor_device(device);
861 if (!stor_device)
862 return -ENODEV;
863
864 request = &stor_device->init_request;
865 vstor_packet = &request->vstor_packet;
866
867 /*
868 * Now, initiate the vsc/vsp initialization protocol on the open
869 * channel
870 */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800871 memset(request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700872 init_completion(&request->wait_event);
873 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
874 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
875
876 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700877 (sizeof(struct vstor_packet) -
878 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700879 (unsigned long)request,
880 VM_PKT_DATA_INBAND,
881 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
882 if (ret != 0)
883 goto cleanup;
884
885 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
886 if (t == 0) {
887 ret = -ETIMEDOUT;
888 goto cleanup;
889 }
890
891 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
892 vstor_packet->status != 0)
893 goto cleanup;
894
895
896 /* reuse the packet for version range supported */
897 memset(vstor_packet, 0, sizeof(struct vstor_packet));
898 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
899 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
900
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800901 vstor_packet->version.major_minor =
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700902 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800903
904 /*
905 * The revision number is only used in Windows; set it to 0.
906 */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800907 vstor_packet->version.revision = 0;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700908
909 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700910 (sizeof(struct vstor_packet) -
911 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700912 (unsigned long)request,
913 VM_PKT_DATA_INBAND,
914 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
915 if (ret != 0)
916 goto cleanup;
917
918 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
919 if (t == 0) {
920 ret = -ETIMEDOUT;
921 goto cleanup;
922 }
923
924 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
925 vstor_packet->status != 0)
926 goto cleanup;
927
928
929 memset(vstor_packet, 0, sizeof(struct vstor_packet));
930 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
931 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700932
933 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700934 (sizeof(struct vstor_packet) -
935 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700936 (unsigned long)request,
937 VM_PKT_DATA_INBAND,
938 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
939
940 if (ret != 0)
941 goto cleanup;
942
943 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
944 if (t == 0) {
945 ret = -ETIMEDOUT;
946 goto cleanup;
947 }
948
949 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
950 vstor_packet->status != 0)
951 goto cleanup;
952
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700953 /*
954 * Check to see if multi-channel support is there.
955 * Hosts that implement protocol version of 5.1 and above
956 * support multi-channel.
957 */
958 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
959 if ((vmbus_proto_version != VERSION_WIN7) &&
960 (vmbus_proto_version != VERSION_WS2008)) {
961 if (vstor_packet->storage_channel_properties.flags &
962 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
963 process_sub_channels = true;
964 }
965
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700966 memset(vstor_packet, 0, sizeof(struct vstor_packet));
967 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
968 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
969
970 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700971 (sizeof(struct vstor_packet) -
972 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700973 (unsigned long)request,
974 VM_PKT_DATA_INBAND,
975 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
976
977 if (ret != 0)
978 goto cleanup;
979
980 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
981 if (t == 0) {
982 ret = -ETIMEDOUT;
983 goto cleanup;
984 }
985
986 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
987 vstor_packet->status != 0)
988 goto cleanup;
989
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700990 if (process_sub_channels)
991 handle_multichannel_storage(device, max_chns);
992
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700993
994cleanup:
995 return ret;
996}
997
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800998static void storvsc_handle_error(struct vmscsi_request *vm_srb,
999 struct scsi_cmnd *scmnd,
1000 struct Scsi_Host *host,
1001 u8 asc, u8 ascq)
1002{
1003 struct storvsc_scan_work *wrk;
1004 void (*process_err_fn)(struct work_struct *work);
1005 bool do_work = false;
1006
1007 switch (vm_srb->srb_status) {
1008 case SRB_STATUS_ERROR:
1009 /*
1010 * If there is an error; offline the device since all
1011 * error recovery strategies would have already been
1012 * deployed on the host side. However, if the command
1013 * were a pass-through command deal with it appropriately.
1014 */
1015 switch (scmnd->cmnd[0]) {
1016 case ATA_16:
1017 case ATA_12:
1018 set_host_byte(scmnd, DID_PASSTHROUGH);
1019 break;
1020 default:
1021 set_host_byte(scmnd, DID_TARGET_FAILURE);
1022 }
1023 break;
1024 case SRB_STATUS_INVALID_LUN:
1025 do_work = true;
1026 process_err_fn = storvsc_remove_lun;
1027 break;
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001028 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1029 if ((asc == 0x2a) && (ascq == 0x9)) {
1030 do_work = true;
1031 process_err_fn = storvsc_device_scan;
1032 /*
1033 * Retry the I/O that trigerred this.
1034 */
1035 set_host_byte(scmnd, DID_REQUEUE);
1036 }
1037 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001038 }
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001039
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001040 if (!do_work)
1041 return;
1042
1043 /*
1044 * We need to schedule work to process this error; schedule it.
1045 */
1046 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1047 if (!wrk) {
1048 set_host_byte(scmnd, DID_TARGET_FAILURE);
1049 return;
1050 }
1051
1052 wrk->host = host;
1053 wrk->lun = vm_srb->lun;
1054 INIT_WORK(&wrk->work, process_err_fn);
1055 schedule_work(&wrk->work);
1056}
1057
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001058
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001059static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001060{
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001061 struct scsi_cmnd *scmnd = cmd_request->cmd;
1062 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1063 void (*scsi_done_fn)(struct scsi_cmnd *);
1064 struct scsi_sense_hdr sense_hdr;
1065 struct vmscsi_request *vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001066 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001067 struct Scsi_Host *host;
1068 struct storvsc_device *stor_dev;
1069 struct hv_device *dev = host_dev->dev;
1070
1071 stor_dev = get_in_stor_device(dev);
1072 host = stor_dev->host;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001073
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001074 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001075 if (cmd_request->bounce_sgl_count) {
1076 if (vm_srb->data_in == READ_TYPE)
1077 copy_from_bounce_buffer(scsi_sglist(scmnd),
1078 cmd_request->bounce_sgl,
1079 scsi_sg_count(scmnd),
1080 cmd_request->bounce_sgl_count);
1081 destroy_bounce_buffer(cmd_request->bounce_sgl,
1082 cmd_request->bounce_sgl_count);
1083 }
1084
K. Y. Srinivasan42e22ca2012-04-05 12:26:52 -07001085 scmnd->result = vm_srb->scsi_status;
1086
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001087 if (scmnd->result) {
1088 if (scsi_normalize_sense(scmnd->sense_buffer,
1089 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1090 scsi_print_sense_hdr("storvsc", &sense_hdr);
1091 }
1092
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001093 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1094 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1095 sense_hdr.ascq);
1096
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001097 scsi_set_resid(scmnd,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001098 cmd_request->data_buffer.len -
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001099 vm_srb->data_transfer_length);
1100
1101 scsi_done_fn = scmnd->scsi_done;
1102
1103 scmnd->host_scribble = NULL;
1104 scmnd->scsi_done = NULL;
1105
1106 scsi_done_fn(scmnd);
1107
1108 mempool_free(cmd_request, memp->request_mempool);
1109}
1110
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001111static void storvsc_on_io_completion(struct hv_device *device,
1112 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001113 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001114{
1115 struct storvsc_device *stor_device;
1116 struct vstor_packet *stor_pkt;
1117
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001118 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001119 stor_pkt = &request->vstor_packet;
1120
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001121 /*
1122 * The current SCSI handling on the host side does
1123 * not correctly handle:
1124 * INQUIRY command with page code parameter set to 0x80
1125 * MODE_SENSE command with cmd[2] == 0x1c
1126 *
1127 * Setup srb and scsi status so this won't be fatal.
1128 * We do this so we can distinguish truly fatal failues
1129 * (srb status == 0x4) and off-line the device in that case.
1130 */
1131
1132 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -08001133 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001134 vstor_packet->vm_srb.scsi_status = 0;
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001135 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001136 }
1137
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001138
1139 /* Copy over the status...etc */
1140 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1141 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1142 stor_pkt->vm_srb.sense_info_length =
1143 vstor_packet->vm_srb.sense_info_length;
1144
1145 if (vstor_packet->vm_srb.scsi_status != 0 ||
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001146 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001147 dev_warn(&device->device,
1148 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1149 stor_pkt->vm_srb.cdb[0],
1150 vstor_packet->vm_srb.scsi_status,
1151 vstor_packet->vm_srb.srb_status);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001152 }
1153
1154 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1155 /* CHECK_CONDITION */
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001156 if (vstor_packet->vm_srb.srb_status &
1157 SRB_STATUS_AUTOSENSE_VALID) {
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001158 /* autosense data available */
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001159 dev_warn(&device->device,
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001160 "stor pkt %p autosense data valid - len %d\n",
1161 request,
1162 vstor_packet->vm_srb.sense_info_length);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001163
1164 memcpy(request->sense_buffer,
1165 vstor_packet->vm_srb.sense_data,
1166 vstor_packet->vm_srb.sense_info_length);
1167
1168 }
1169 }
1170
1171 stor_pkt->vm_srb.data_transfer_length =
1172 vstor_packet->vm_srb.data_transfer_length;
1173
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001174 storvsc_command_completion(request);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001175
1176 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1177 stor_device->drain_notify)
1178 wake_up(&stor_device->waiting_to_drain);
1179
1180
1181}
1182
1183static void storvsc_on_receive(struct hv_device *device,
1184 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001185 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001186{
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001187 struct storvsc_scan_work *work;
1188 struct storvsc_device *stor_device;
1189
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001190 switch (vstor_packet->operation) {
1191 case VSTOR_OPERATION_COMPLETE_IO:
1192 storvsc_on_io_completion(device, vstor_packet, request);
1193 break;
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001194
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001195 case VSTOR_OPERATION_REMOVE_DEVICE:
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001196 case VSTOR_OPERATION_ENUMERATE_BUS:
1197 stor_device = get_in_stor_device(device);
1198 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1199 if (!work)
1200 return;
1201
1202 INIT_WORK(&work->work, storvsc_bus_scan);
1203 work->host = stor_device->host;
1204 schedule_work(&work->work);
1205 break;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001206
1207 default:
1208 break;
1209 }
1210}
1211
1212static void storvsc_on_channel_callback(void *context)
1213{
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001214 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1215 struct hv_device *device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001216 struct storvsc_device *stor_device;
1217 u32 bytes_recvd;
1218 u64 request_id;
1219 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001220 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001221 int ret;
1222
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001223 if (channel->primary_channel != NULL)
1224 device = channel->primary_channel->device_obj;
1225 else
1226 device = channel->device_obj;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001227
1228 stor_device = get_in_stor_device(device);
1229 if (!stor_device)
1230 return;
1231
1232 do {
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001233 ret = vmbus_recvpacket(channel, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001234 ALIGN((sizeof(struct vstor_packet) -
1235 vmscsi_size_delta), 8),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001236 &bytes_recvd, &request_id);
1237 if (ret == 0 && bytes_recvd > 0) {
1238
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001239 request = (struct storvsc_cmd_request *)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001240 (unsigned long)request_id;
1241
1242 if ((request == &stor_device->init_request) ||
1243 (request == &stor_device->reset_request)) {
1244
1245 memcpy(&request->vstor_packet, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001246 (sizeof(struct vstor_packet) -
1247 vmscsi_size_delta));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001248 complete(&request->wait_event);
1249 } else {
1250 storvsc_on_receive(device,
1251 (struct vstor_packet *)packet,
1252 request);
1253 }
1254 } else {
1255 break;
1256 }
1257 } while (1);
1258
1259 return;
1260}
1261
1262static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1263{
1264 struct vmstorage_channel_properties props;
1265 int ret;
1266
1267 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1268
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001269 ret = vmbus_open(device->channel,
1270 ring_size,
1271 ring_size,
1272 (void *)&props,
1273 sizeof(struct vmstorage_channel_properties),
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001274 storvsc_on_channel_callback, device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001275
1276 if (ret != 0)
1277 return ret;
1278
1279 ret = storvsc_channel_init(device);
1280
1281 return ret;
1282}
1283
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001284static int storvsc_dev_remove(struct hv_device *device)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001285{
1286 struct storvsc_device *stor_device;
1287 unsigned long flags;
1288
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001289 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001290
1291 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1292 stor_device->destroy = true;
1293 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1294
1295 /*
1296 * At this point, all outbound traffic should be disable. We
1297 * only allow inbound traffic (responses) to proceed so that
1298 * outstanding requests can be completed.
1299 */
1300
1301 storvsc_wait_to_drain(stor_device);
1302
1303 /*
1304 * Since we have already drained, we don't need to busy wait
1305 * as was done in final_release_stor_device()
1306 * Note that we cannot set the ext pointer to NULL until
1307 * we have drained - to drain the outgoing packets, we need to
1308 * allow incoming packets.
1309 */
1310 spin_lock_irqsave(&device->channel->inbound_lock, flags);
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001311 hv_set_drvdata(device, NULL);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001312 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1313
1314 /* Close the channel */
1315 vmbus_close(device->channel);
1316
1317 kfree(stor_device);
1318 return 0;
1319}
1320
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001321static int storvsc_do_io(struct hv_device *device,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001322 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001323{
1324 struct storvsc_device *stor_device;
1325 struct vstor_packet *vstor_packet;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001326 struct vmbus_channel *outgoing_channel;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001327 int ret = 0;
1328
1329 vstor_packet = &request->vstor_packet;
1330 stor_device = get_out_stor_device(device);
1331
1332 if (!stor_device)
1333 return -ENODEV;
1334
1335
1336 request->device = device;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001337 /*
1338 * Select an an appropriate channel to send the request out.
1339 */
1340
1341 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001342
1343
1344 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1345
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001346 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1347 vmscsi_size_delta);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001348
1349
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001350 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001351
1352
1353 vstor_packet->vm_srb.data_transfer_length =
1354 request->data_buffer.len;
1355
1356 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1357
1358 if (request->data_buffer.len) {
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001359 ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001360 &request->data_buffer,
1361 vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001362 (sizeof(struct vstor_packet) -
1363 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001364 (unsigned long)request);
1365 } else {
1366 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001367 (sizeof(struct vstor_packet) -
1368 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001369 (unsigned long)request,
1370 VM_PKT_DATA_INBAND,
1371 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1372 }
1373
1374 if (ret != 0)
1375 return ret;
1376
1377 atomic_inc(&stor_device->num_outstanding_req);
1378
1379 return ret;
1380}
1381
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001382static int storvsc_device_alloc(struct scsi_device *sdevice)
1383{
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001384 struct stor_mem_pools *memp;
1385 int number = STORVSC_MIN_BUF_NR;
1386
1387 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1388 if (!memp)
1389 return -ENOMEM;
1390
1391 memp->request_pool =
1392 kmem_cache_create(dev_name(&sdevice->sdev_dev),
1393 sizeof(struct storvsc_cmd_request), 0,
1394 SLAB_HWCACHE_ALIGN, NULL);
1395
1396 if (!memp->request_pool)
1397 goto err0;
1398
1399 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1400 mempool_free_slab,
1401 memp->request_pool);
1402
1403 if (!memp->request_mempool)
1404 goto err1;
1405
1406 sdevice->hostdata = memp;
1407
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001408 return 0;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001409
1410err1:
1411 kmem_cache_destroy(memp->request_pool);
1412
1413err0:
1414 kfree(memp);
1415 return -ENOMEM;
1416}
1417
1418static void storvsc_device_destroy(struct scsi_device *sdevice)
1419{
1420 struct stor_mem_pools *memp = sdevice->hostdata;
1421
1422 mempool_destroy(memp->request_mempool);
1423 kmem_cache_destroy(memp->request_pool);
1424 kfree(memp);
1425 sdevice->hostdata = NULL;
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001426}
1427
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001428static int storvsc_device_configure(struct scsi_device *sdevice)
1429{
1430 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1431 STORVSC_MAX_IO_REQUESTS);
1432
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001433 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1434
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001435 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001436
K. Y. Srinivasan893def32013-06-04 12:05:05 -07001437 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1438
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001439 sdevice->no_write_same = 1;
1440
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001441 return 0;
1442}
1443
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001444static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1445 sector_t capacity, int *info)
1446{
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001447 sector_t nsect = capacity;
1448 sector_t cylinders = nsect;
1449 int heads, sectors_pt;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001450
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001451 /*
1452 * We are making up these values; let us keep it simple.
1453 */
1454 heads = 0xff;
1455 sectors_pt = 0x3f; /* Sectors per track */
1456 sector_div(cylinders, heads * sectors_pt);
1457 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1458 cylinders = 0xffff;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001459
1460 info[0] = heads;
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001461 info[1] = sectors_pt;
1462 info[2] = (int)cylinders;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001463
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001464 return 0;
1465}
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001466
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001467static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001468{
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001469 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1470 struct hv_device *device = host_dev->dev;
1471
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001472 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001473 struct storvsc_cmd_request *request;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001474 struct vstor_packet *vstor_packet;
1475 int ret, t;
1476
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001477
K. Y. Srinivasan1eaaddf2011-08-27 11:31:03 -07001478 stor_device = get_out_stor_device(device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001479 if (!stor_device)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001480 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001481
1482 request = &stor_device->reset_request;
1483 vstor_packet = &request->vstor_packet;
1484
1485 init_completion(&request->wait_event);
1486
1487 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1488 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1489 vstor_packet->vm_srb.path_id = stor_device->path_id;
1490
1491 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001492 (sizeof(struct vstor_packet) -
1493 vmscsi_size_delta),
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001494 (unsigned long)&stor_device->reset_request,
1495 VM_PKT_DATA_INBAND,
1496 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1497 if (ret != 0)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001498 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001499
K. Y. Srinivasan46d2eb62011-06-16 13:16:36 -07001500 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001501 if (t == 0)
1502 return TIMEOUT_ERROR;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001503
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001504
1505 /*
1506 * At this point, all outstanding requests in the adapter
1507 * should have been flushed out and return to us
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001508 * There is a potential race here where the host may be in
1509 * the process of responding when we return from here.
1510 * Just wait for all in-transit packets to be accounted for
1511 * before we return from here.
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001512 */
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001513 storvsc_wait_to_drain(stor_device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001514
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001515 return SUCCESS;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001516}
1517
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001518static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001519{
1520 bool allowed = true;
1521 u8 scsi_op = scmnd->cmnd[0];
1522
1523 switch (scsi_op) {
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001524 /* the host does not handle WRITE_SAME, log accident usage */
1525 case WRITE_SAME:
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001526 /*
1527 * smartd sends this command and the host does not handle
1528 * this. So, don't send it.
1529 */
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001530 case SET_WINDOW:
K. Y. Srinivasan59e00e72011-11-08 09:01:42 -08001531 scmnd->result = ILLEGAL_REQUEST << 16;
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001532 allowed = false;
1533 break;
1534 default:
1535 break;
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001536 }
1537 return allowed;
1538}
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001539
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001540static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001541{
1542 int ret;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001543 struct hv_host_device *host_dev = shost_priv(host);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001544 struct hv_device *dev = host_dev->dev;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001545 struct storvsc_cmd_request *cmd_request;
1546 unsigned int request_size = 0;
1547 int i;
1548 struct scatterlist *sgl;
1549 unsigned int sg_count = 0;
1550 struct vmscsi_request *vm_srb;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001551 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001552
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001553 if (!storvsc_scsi_cmd_ok(scmnd)) {
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001554 scmnd->scsi_done(scmnd);
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001555 return 0;
1556 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001557
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001558 request_size = sizeof(struct storvsc_cmd_request);
1559
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001560 cmd_request = mempool_alloc(memp->request_mempool,
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001561 GFP_ATOMIC);
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001562
1563 /*
1564 * We might be invoked in an interrupt context; hence
1565 * mempool_alloc() can fail.
1566 */
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001567 if (!cmd_request)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001568 return SCSI_MLQUEUE_DEVICE_BUSY;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001569
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001570 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001571
1572 /* Setup the cmd request */
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001573 cmd_request->cmd = scmnd;
1574
1575 scmnd->host_scribble = (unsigned char *)cmd_request;
1576
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001577 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001578 vm_srb->win8_extension.time_out_value = 60;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001579
1580
1581 /* Build the SRB */
1582 switch (scmnd->sc_data_direction) {
1583 case DMA_TO_DEVICE:
1584 vm_srb->data_in = WRITE_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001585 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1586 vm_srb->win8_extension.srb_flags |=
1587 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1588 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001589 break;
1590 case DMA_FROM_DEVICE:
1591 vm_srb->data_in = READ_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001592 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1593 vm_srb->win8_extension.srb_flags |=
1594 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1595 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001596 break;
1597 default:
1598 vm_srb->data_in = UNKNOWN_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001599 vm_srb->win8_extension.srb_flags = 0;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001600 break;
1601 }
1602
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001603
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001604 vm_srb->port_number = host_dev->port;
1605 vm_srb->path_id = scmnd->device->channel;
1606 vm_srb->target_id = scmnd->device->id;
1607 vm_srb->lun = scmnd->device->lun;
1608
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001609 vm_srb->cdb_length = scmnd->cmd_len;
1610
1611 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1612
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001613 cmd_request->sense_buffer = scmnd->sense_buffer;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001614
1615
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001616 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001617 if (scsi_sg_count(scmnd)) {
1618 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1619 sg_count = scsi_sg_count(scmnd);
1620
1621 /* check if we need to bounce the sgl */
1622 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1623 cmd_request->bounce_sgl =
1624 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
K. Y. Srinivasan6e8087a2011-12-07 07:15:52 -08001625 scsi_bufflen(scmnd),
1626 vm_srb->data_in);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001627 if (!cmd_request->bounce_sgl) {
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001628 ret = SCSI_MLQUEUE_HOST_BUSY;
1629 goto queue_error;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001630 }
1631
1632 cmd_request->bounce_sgl_count =
1633 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1634 PAGE_SHIFT;
1635
K. Y. Srinivasanfa23b8c2011-08-27 11:31:21 -07001636 if (vm_srb->data_in == WRITE_TYPE)
1637 copy_to_bounce_buffer(sgl,
1638 cmd_request->bounce_sgl,
1639 scsi_sg_count(scmnd));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001640
1641 sgl = cmd_request->bounce_sgl;
1642 sg_count = cmd_request->bounce_sgl_count;
1643 }
1644
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001645 cmd_request->data_buffer.offset = sgl[0].offset;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001646
1647 for (i = 0; i < sg_count; i++)
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001648 cmd_request->data_buffer.pfn_array[i] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001649 page_to_pfn(sg_page((&sgl[i])));
1650
1651 } else if (scsi_sglist(scmnd)) {
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001652 cmd_request->data_buffer.offset =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001653 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001654 cmd_request->data_buffer.pfn_array[0] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001655 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1656 }
1657
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001658 /* Invokes the vsc to start an IO */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001659 ret = storvsc_do_io(dev, cmd_request);
K. Y. Srinivasan636f0fd2011-05-10 07:54:50 -07001660
K. Y. Srinivasand2598f02011-08-25 09:48:58 -07001661 if (ret == -EAGAIN) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001662 /* no more space */
1663
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001664 if (cmd_request->bounce_sgl_count) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001665 destroy_bounce_buffer(cmd_request->bounce_sgl,
K. Y. Srinivasan70691ec2011-08-27 11:31:29 -07001666 cmd_request->bounce_sgl_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001667
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001668 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1669 goto queue_error;
1670 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001671 }
1672
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001673 return 0;
1674
1675queue_error:
1676 mempool_free(cmd_request, memp->request_mempool);
1677 scmnd->host_scribble = NULL;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001678 return ret;
1679}
1680
Hank Janssenbef4a342009-07-13 16:01:31 -07001681static struct scsi_host_template scsi_driver = {
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001682 .module = THIS_MODULE,
1683 .name = "storvsc_host_t",
1684 .bios_param = storvsc_get_chs,
1685 .queuecommand = storvsc_queuecommand,
1686 .eh_host_reset_handler = storvsc_host_reset_handler,
1687 .slave_alloc = storvsc_device_alloc,
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001688 .slave_destroy = storvsc_device_destroy,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001689 .slave_configure = storvsc_device_configure,
1690 .cmd_per_lun = 1,
1691 /* 64 max_queue * 1 target */
Lars Lindley0686e4f2010-03-11 23:51:23 +01001692 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001693 .this_id = -1,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001694 /* no use setting to 0 since ll_blk_rw reset it to 1 */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001695 /* currently 32 */
1696 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
K. Y. Srinivasan039db522011-12-01 04:59:16 -08001697 .use_clustering = DISABLE_CLUSTERING,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001698 /* Make sure we dont get a sg segment crosses a page boundary */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001699 .dma_boundary = PAGE_SIZE-1,
Martin K. Petersen54b2b502013-10-23 06:25:40 -04001700 .no_write_same = 1,
Hank Janssenbef4a342009-07-13 16:01:31 -07001701};
1702
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001703enum {
1704 SCSI_GUID,
1705 IDE_GUID,
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001706 SFC_GUID,
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001707};
1708
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001709static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001710 /* SCSI guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001711 { HV_SCSI_GUID,
1712 .driver_data = SCSI_GUID
1713 },
K. Y. Srinivasan21e37742011-08-27 11:31:18 -07001714 /* IDE guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001715 { HV_IDE_GUID,
1716 .driver_data = IDE_GUID
1717 },
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001718 /* Fibre Channel GUID */
1719 {
1720 HV_SYNTHFC_GUID,
1721 .driver_data = SFC_GUID
1722 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001723 { },
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001724};
Hank Janssenbef4a342009-07-13 16:01:31 -07001725
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001726MODULE_DEVICE_TABLE(vmbus, id_table);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001727
K. Y. Srinivasan84946892011-09-13 10:59:38 -07001728static int storvsc_probe(struct hv_device *device,
1729 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001730{
1731 int ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001732 struct Scsi_Host *host;
1733 struct hv_host_device *host_dev;
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001734 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001735 int target = 0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001736 struct storvsc_device *stor_device;
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001737
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001738 /*
1739 * Based on the windows host we are running on,
1740 * set state to properly communicate with the host.
1741 */
1742
1743 if (vmbus_proto_version == VERSION_WIN8) {
1744 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1745 vmscsi_size_delta = 0;
1746 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1747 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1748 } else {
1749 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1750 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1751 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1752 vmstor_current_minor = VMSTOR_WIN7_MINOR;
1753 }
1754
1755
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001756 host = scsi_host_alloc(&scsi_driver,
1757 sizeof(struct hv_host_device));
1758 if (!host)
1759 return -ENOMEM;
1760
K. Y. Srinivasan7f33f302011-11-08 09:01:44 -08001761 host_dev = shost_priv(host);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001762 memset(host_dev, 0, sizeof(struct hv_host_device));
1763
1764 host_dev->port = host->host_no;
1765 host_dev->dev = device;
1766
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001767
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001768 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001769 if (!stor_device) {
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001770 ret = -ENOMEM;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001771 goto err_out0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001772 }
1773
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001774 stor_device->destroy = false;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001775 stor_device->open_sub_channel = false;
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001776 init_waitqueue_head(&stor_device->waiting_to_drain);
1777 stor_device->device = device;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001778 stor_device->host = host;
1779 hv_set_drvdata(device, stor_device);
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001780
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001781 stor_device->port_number = host->host_no;
1782 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001783 if (ret)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001784 goto err_out1;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001785
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001786 host_dev->path = stor_device->path_id;
1787 host_dev->target = stor_device->target_id;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001788
1789 /* max # of devices per target */
1790 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1791 /* max # of targets per channel */
1792 host->max_id = STORVSC_MAX_TARGETS;
1793 /* max # of channels */
1794 host->max_channel = STORVSC_MAX_CHANNELS - 1;
Mike Sterlingcf55f4a2011-09-06 16:10:55 -07001795 /* max cmd length */
1796 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001797
1798 /* Register the HBA and start the scsi bus scan */
1799 ret = scsi_add_host(host, &device->device);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001800 if (ret != 0)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001801 goto err_out2;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001802
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001803 if (!dev_is_ide) {
1804 scsi_scan_host(host);
K. Y. Srinivasan59d22952012-01-12 12:37:55 -08001805 } else {
1806 target = (device->dev_instance.b[5] << 8 |
1807 device->dev_instance.b[4]);
1808 ret = scsi_add_device(host, 0, target, 0);
1809 if (ret) {
1810 scsi_remove_host(host);
1811 goto err_out2;
1812 }
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001813 }
1814 return 0;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001815
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001816err_out2:
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001817 /*
1818 * Once we have connected with the host, we would need to
1819 * to invoke storvsc_dev_remove() to rollback this state and
1820 * this call also frees up the stor_device; hence the jump around
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001821 * err_out1 label.
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001822 */
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001823 storvsc_dev_remove(device);
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001824 goto err_out0;
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001825
1826err_out1:
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001827 kfree(stor_device);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001828
1829err_out0:
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001830 scsi_host_put(host);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001831 return ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001832}
1833
K. Y. Srinivasanddcbf652012-01-12 12:37:59 -08001834static int storvsc_remove(struct hv_device *dev)
1835{
1836 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1837 struct Scsi_Host *host = stor_device->host;
1838
1839 scsi_remove_host(host);
1840 storvsc_dev_remove(dev);
1841 scsi_host_put(host);
1842
1843 return 0;
1844}
1845
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001846static struct hv_driver storvsc_drv = {
K. Y. Srinivasanfafb0ef2011-11-08 09:01:46 -08001847 .name = KBUILD_MODNAME,
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001848 .id_table = id_table,
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001849 .probe = storvsc_probe,
1850 .remove = storvsc_remove,
K. Y. Srinivasan39ae6fa2011-05-10 07:54:46 -07001851};
K. Y. Srinivasan7bd05b92011-05-10 07:54:45 -07001852
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001853static int __init storvsc_drv_init(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001854{
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001855 u32 max_outstanding_req_per_channel;
1856
1857 /*
1858 * Divide the ring buffer data size (which is 1 page less
1859 * than the ring buffer size since that page is reserved for
1860 * the ring buffer indices) by the max request size (which is
1861 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1862 */
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001863 max_outstanding_req_per_channel =
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001864 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1865 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001866 sizeof(struct vstor_packet) + sizeof(u64) -
1867 vmscsi_size_delta,
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001868 sizeof(u64)));
Hank Janssenbef4a342009-07-13 16:01:31 -07001869
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001870 if (max_outstanding_req_per_channel <
K. Y. Srinivasanf8feed02011-05-10 07:54:24 -07001871 STORVSC_MAX_IO_REQUESTS)
K. Y. Srinivasanb06efc12011-08-25 09:49:10 -07001872 return -EINVAL;
Hank Janssenbef4a342009-07-13 16:01:31 -07001873
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001874 return vmbus_driver_register(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001875}
1876
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001877static void __exit storvsc_drv_exit(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001878{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001879 vmbus_driver_unregister(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001880}
1881
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001882MODULE_LICENSE("GPL");
Stephen Hemminger3afc7cc32010-05-06 21:44:45 -07001883MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001884module_init(storvsc_drv_init);
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001885module_exit(storvsc_drv_exit);