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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>
K. Y. Srinivasan56b26e62014-07-12 09:48:30 -070036#include <linux/blkdev.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070037#include <scsi/scsi.h>
38#include <scsi/scsi_cmnd.h>
39#include <scsi/scsi_host.h>
40#include <scsi/scsi_device.h>
41#include <scsi/scsi_tcq.h>
42#include <scsi/scsi_eh.h>
43#include <scsi/scsi_devinfo.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070044#include <scsi/scsi_dbg.h>
K. Y. Srinivasan3f335ea2011-05-12 19:34:15 -070045
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080046/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -080047 * All wire protocol details (storage protocol between the guest and the host)
48 * are consolidated here.
49 *
50 * Begin protocol definitions.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080051 */
52
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080053/*
54 * Version history:
55 * V1 Beta: 0.1
56 * V1 RC < 2008/1/31: 1.0
57 * V1 RC > 2008/1/31: 2.0
58 * Win7: 4.2
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070059 * Win8: 5.1
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080060 */
61
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070062
63#define VMSTOR_WIN7_MAJOR 4
64#define VMSTOR_WIN7_MINOR 2
65
66#define VMSTOR_WIN8_MAJOR 5
67#define VMSTOR_WIN8_MINOR 1
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070068
69
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070070/* Packet structure describing virtual storage requests. */
71enum vstor_packet_operation {
72 VSTOR_OPERATION_COMPLETE_IO = 1,
73 VSTOR_OPERATION_REMOVE_DEVICE = 2,
74 VSTOR_OPERATION_EXECUTE_SRB = 3,
75 VSTOR_OPERATION_RESET_LUN = 4,
76 VSTOR_OPERATION_RESET_ADAPTER = 5,
77 VSTOR_OPERATION_RESET_BUS = 6,
78 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
79 VSTOR_OPERATION_END_INITIALIZATION = 8,
80 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
81 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
K. Y. Srinivasan2b9525f2011-11-08 09:01:48 -080082 VSTOR_OPERATION_ENUMERATE_BUS = 11,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070083 VSTOR_OPERATION_FCHBA_DATA = 12,
84 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
85 VSTOR_OPERATION_MAXIMUM = 13
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070086};
87
88/*
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070089 * WWN packet for Fibre Channel HBA
90 */
91
92struct hv_fc_wwn_packet {
93 bool primary_active;
94 u8 reserved1;
95 u8 reserved2;
96 u8 primary_port_wwn[8];
97 u8 primary_node_wwn[8];
98 u8 secondary_port_wwn[8];
99 u8 secondary_node_wwn[8];
100};
101
102
103
104/*
105 * SRB Flag Bits
106 */
107
108#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
109#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
110#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
111#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
112#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
113#define SRB_FLAGS_DATA_IN 0x00000040
114#define SRB_FLAGS_DATA_OUT 0x00000080
115#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
116#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
117#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
118#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
119#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
120
121/*
122 * This flag indicates the request is part of the workflow for processing a D3.
123 */
124#define SRB_FLAGS_D3_PROCESSING 0x00000800
125#define SRB_FLAGS_IS_ACTIVE 0x00010000
126#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
127#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
128#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
129#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
130#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
131#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
132#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
133#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
134#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
135
136
137/*
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700138 * Platform neutral description of a scsi request -
139 * this remains the same across the write regardless of 32/64 bit
140 * note: it's patterned off the SCSI_PASS_THROUGH structure
141 */
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800142#define STORVSC_MAX_CMD_LEN 0x10
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700143
144#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
145#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
146
147#define STORVSC_SENSE_BUFFER_SIZE 0x14
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800148#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700149
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700150/*
151 * Sense buffer size changed in win8; have a run-time
152 * variable to track the size we should use.
153 */
154static int sense_buffer_size;
155
156/*
157 * The size of the vmscsi_request has changed in win8. The
158 * additional size is because of new elements added to the
159 * structure. These elements are valid only when we are talking
160 * to a win8 host.
161 * Track the correction to size we need to apply.
162 */
163
164static int vmscsi_size_delta;
165static int vmstor_current_major;
166static int vmstor_current_minor;
167
168struct vmscsi_win8_extension {
169 /*
170 * The following were added in Windows 8
171 */
172 u16 reserve;
173 u8 queue_tag;
174 u8 queue_action;
175 u32 srb_flags;
176 u32 time_out_value;
177 u32 queue_sort_ey;
178} __packed;
179
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700180struct vmscsi_request {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800181 u16 length;
182 u8 srb_status;
183 u8 scsi_status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700184
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800185 u8 port_number;
186 u8 path_id;
187 u8 target_id;
188 u8 lun;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700189
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800190 u8 cdb_length;
191 u8 sense_info_length;
192 u8 data_in;
193 u8 reserved;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700194
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800195 u32 data_transfer_length;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700196
197 union {
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800198 u8 cdb[STORVSC_MAX_CMD_LEN];
199 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
200 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700201 };
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700202 /*
203 * The following was added in win8.
204 */
205 struct vmscsi_win8_extension win8_extension;
206
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700207} __attribute((packed));
208
209
210/*
211 * This structure is sent during the intialization phase to get the different
212 * properties of the channel.
213 */
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700214
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700215#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
216
217struct vmstorage_channel_properties {
218 u32 reserved;
219 u16 max_channel_cnt;
220 u16 reserved1;
221
222 u32 flags;
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800223 u32 max_transfer_bytes;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700224
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700225 u64 reserved2;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700226} __packed;
227
228/* This structure is sent during the storage protocol negotiations. */
229struct vmstorage_protocol_version {
230 /* Major (MSW) and minor (LSW) version numbers. */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800231 u16 major_minor;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700232
233 /*
234 * Revision number is auto-incremented whenever this file is changed
235 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
236 * definitely indicate incompatibility--but it does indicate mismatched
237 * builds.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800238 * This is only used on the windows side. Just set it to 0.
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700239 */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800240 u16 revision;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700241} __packed;
242
243/* Channel Property Flags */
244#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
245#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
246
247struct vstor_packet {
248 /* Requested operation type */
249 enum vstor_packet_operation operation;
250
251 /* Flags - see below for values */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800252 u32 flags;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700253
254 /* Status of the request returned from the server side. */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800255 u32 status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700256
257 /* Data payload area */
258 union {
259 /*
260 * Structure used to forward SCSI commands from the
261 * client to the server.
262 */
263 struct vmscsi_request vm_srb;
264
265 /* Structure used to query channel properties. */
266 struct vmstorage_channel_properties storage_channel_properties;
267
268 /* Used during version negotiations. */
269 struct vmstorage_protocol_version version;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700270
271 /* Fibre channel address packet */
272 struct hv_fc_wwn_packet wwn_packet;
273
274 /* Number of sub-channels to create */
275 u16 sub_channel_count;
276
277 /* This will be the maximum of the union members */
278 u8 buffer[0x34];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700279 };
280} __packed;
281
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700282/*
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800283 * Packet Flags:
284 *
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700285 * This flag indicates that the server should send back a completion for this
286 * packet.
287 */
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800288
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700289#define REQUEST_COMPLETION_FLAG 0x1
290
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700291/* Matches Windows-end */
292enum storvsc_request_type {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800293 WRITE_TYPE = 0,
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700294 READ_TYPE,
295 UNKNOWN_TYPE,
296};
297
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800298/*
299 * SRB status codes and masks; a subset of the codes used here.
300 */
301
302#define SRB_STATUS_AUTOSENSE_VALID 0x80
303#define SRB_STATUS_INVALID_LUN 0x20
304#define SRB_STATUS_SUCCESS 0x01
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800305#define SRB_STATUS_ABORTED 0x02
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800306#define SRB_STATUS_ERROR 0x04
307
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800308/*
309 * This is the end of Protocol specific defines.
310 */
311
312
313/*
314 * We setup a mempool to allocate request structures for this driver
315 * on a per-lun basis. The following define specifies the number of
316 * elements in the pool.
317 */
318
319#define STORVSC_MIN_BUF_NR 64
320static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
321
322module_param(storvsc_ringbuffer_size, int, S_IRUGO);
323MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
324
K. Y. Srinivasan893def32013-06-04 12:05:05 -0700325/*
326 * Timeout in seconds for all devices managed by this driver.
327 */
328static int storvsc_timeout = 180;
329
K. Y. Srinivasanf3cfabc2014-07-21 16:06:01 -0700330static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
331
K. Y. Srinivasanbb6a4df2013-06-04 12:05:09 -0700332#define STORVSC_MAX_IO_REQUESTS 200
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800333
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700334static void storvsc_on_channel_callback(void *context);
335
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700336#define STORVSC_MAX_LUNS_PER_TARGET 255
337#define STORVSC_MAX_TARGETS 2
338#define STORVSC_MAX_CHANNELS 8
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800339
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700340#define STORVSC_FC_MAX_LUNS_PER_TARGET 255
341#define STORVSC_FC_MAX_TARGETS 128
342#define STORVSC_FC_MAX_CHANNELS 8
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800343
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700344#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
345#define STORVSC_IDE_MAX_TARGETS 1
346#define STORVSC_IDE_MAX_CHANNELS 1
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800347
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800348struct storvsc_cmd_request {
349 struct list_head entry;
350 struct scsi_cmnd *cmd;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700351
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800352 unsigned int bounce_sgl_count;
353 struct scatterlist *bounce_sgl;
354
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700355 struct hv_device *device;
356
357 /* Synchronize the request/response if needed */
358 struct completion wait_event;
359
360 unsigned char *sense_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700361 struct hv_multipage_buffer data_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700362 struct vstor_packet vstor_packet;
363};
364
365
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700366/* A storvsc device is a device object that contains a vmbus channel */
367struct storvsc_device {
368 struct hv_device *device;
369
370 bool destroy;
371 bool drain_notify;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700372 bool open_sub_channel;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700373 atomic_t num_outstanding_req;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700374 struct Scsi_Host *host;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700375
376 wait_queue_head_t waiting_to_drain;
377
378 /*
379 * Each unique Port/Path/Target represents 1 channel ie scsi
380 * controller. In reality, the pathid, targetid is always 0
381 * and the port is set by us
382 */
383 unsigned int port_number;
384 unsigned char path_id;
385 unsigned char target_id;
386
387 /* Used for vsc/vsp channel reset process */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800388 struct storvsc_cmd_request init_request;
389 struct storvsc_cmd_request reset_request;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700390};
391
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800392struct stor_mem_pools {
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700393 struct kmem_cache *request_pool;
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -0800394 mempool_t *request_mempool;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800395};
396
397struct hv_host_device {
398 struct hv_device *dev;
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700399 unsigned int port;
400 unsigned char path;
401 unsigned char target;
402};
403
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800404struct storvsc_scan_work {
405 struct work_struct work;
406 struct Scsi_Host *host;
407 uint lun;
408};
409
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800410static void storvsc_device_scan(struct work_struct *work)
411{
412 struct storvsc_scan_work *wrk;
413 uint lun;
414 struct scsi_device *sdev;
415
416 wrk = container_of(work, struct storvsc_scan_work, work);
417 lun = wrk->lun;
418
419 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
420 if (!sdev)
421 goto done;
422 scsi_rescan_device(&sdev->sdev_gendev);
423 scsi_device_put(sdev);
424
425done:
426 kfree(wrk);
427}
428
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800429static void storvsc_bus_scan(struct work_struct *work)
430{
431 struct storvsc_scan_work *wrk;
432 int id, order_id;
433
434 wrk = container_of(work, struct storvsc_scan_work, work);
435 for (id = 0; id < wrk->host->max_id; ++id) {
436 if (wrk->host->reverse_ordering)
437 order_id = wrk->host->max_id - id - 1;
438 else
439 order_id = id;
440
441 scsi_scan_target(&wrk->host->shost_gendev, 0,
442 order_id, SCAN_WILD_CARD, 1);
443 }
444 kfree(wrk);
445}
446
K. Y. Srinivasanb4017312011-11-08 09:01:50 -0800447static void storvsc_remove_lun(struct work_struct *work)
448{
449 struct storvsc_scan_work *wrk;
450 struct scsi_device *sdev;
451
452 wrk = container_of(work, struct storvsc_scan_work, work);
453 if (!scsi_host_get(wrk->host))
454 goto done;
455
456 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
457
458 if (sdev) {
459 scsi_remove_device(sdev);
460 scsi_device_put(sdev);
461 }
462 scsi_host_put(wrk->host);
463
464done:
465 kfree(wrk);
466}
467
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800468/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800469 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
470 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
471 */
472
473static inline u16 storvsc_get_version(u8 major, u8 minor)
474{
475 u16 version;
476
477 version = ((major << 8) | minor);
478 return version;
479}
480
481/*
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800482 * We can get incoming messages from the host that are not in response to
483 * messages that we have sent out. An example of this would be messages
484 * received by the guest to notify dynamic addition/removal of LUNs. To
485 * deal with potential race conditions where the driver may be in the
486 * midst of being unloaded when we might receive an unsolicited message
487 * from the host, we have implemented a mechanism to gurantee sequential
488 * consistency:
489 *
490 * 1) Once the device is marked as being destroyed, we will fail all
491 * outgoing messages.
492 * 2) We permit incoming messages when the device is being destroyed,
493 * only to properly account for messages already sent out.
494 */
495
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700496static inline struct storvsc_device *get_out_stor_device(
497 struct hv_device *device)
498{
499 struct storvsc_device *stor_device;
500
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700501 stor_device = hv_get_drvdata(device);
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700502
503 if (stor_device && stor_device->destroy)
504 stor_device = NULL;
505
506 return stor_device;
507}
508
509
510static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
511{
512 dev->drain_notify = true;
513 wait_event(dev->waiting_to_drain,
514 atomic_read(&dev->num_outstanding_req) == 0);
515 dev->drain_notify = false;
516}
Hank Janssenbef4a342009-07-13 16:01:31 -0700517
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700518static inline struct storvsc_device *get_in_stor_device(
519 struct hv_device *device)
520{
521 struct storvsc_device *stor_device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700522
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700523 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700524
525 if (!stor_device)
526 goto get_in_err;
527
528 /*
529 * If the device is being destroyed; allow incoming
530 * traffic only to cleanup outstanding requests.
531 */
532
533 if (stor_device->destroy &&
534 (atomic_read(&stor_device->num_outstanding_req) == 0))
535 stor_device = NULL;
536
537get_in_err:
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700538 return stor_device;
539
540}
541
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800542static void destroy_bounce_buffer(struct scatterlist *sgl,
543 unsigned int sg_count)
544{
545 int i;
546 struct page *page_buf;
547
548 for (i = 0; i < sg_count; i++) {
549 page_buf = sg_page((&sgl[i]));
550 if (page_buf != NULL)
551 __free_page(page_buf);
552 }
553
554 kfree(sgl);
555}
556
557static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
558{
559 int i;
560
561 /* No need to check */
562 if (sg_count < 2)
563 return -1;
564
565 /* We have at least 2 sg entries */
566 for (i = 0; i < sg_count; i++) {
567 if (i == 0) {
568 /* make sure 1st one does not have hole */
569 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
570 return i;
571 } else if (i == sg_count - 1) {
572 /* make sure last one does not have hole */
573 if (sgl[i].offset != 0)
574 return i;
575 } else {
576 /* make sure no hole in the middle */
577 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
578 return i;
579 }
580 }
581 return -1;
582}
583
584static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
585 unsigned int sg_count,
586 unsigned int len,
587 int write)
588{
589 int i;
590 int num_pages;
591 struct scatterlist *bounce_sgl;
592 struct page *page_buf;
593 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
594
595 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
596
597 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
598 if (!bounce_sgl)
599 return NULL;
600
K. Y. Srinivasan9d2696e2013-02-06 05:15:28 -0800601 sg_init_table(bounce_sgl, num_pages);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800602 for (i = 0; i < num_pages; i++) {
603 page_buf = alloc_page(GFP_ATOMIC);
604 if (!page_buf)
605 goto cleanup;
606 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
607 }
608
609 return bounce_sgl;
610
611cleanup:
612 destroy_bounce_buffer(bounce_sgl, num_pages);
613 return NULL;
614}
615
Linus Torvalds9f393832012-03-21 09:40:26 -0700616/* Disgusting wrapper functions */
617static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
618{
619 void *addr = kmap_atomic(sg_page(sgl + idx));
620 return (unsigned long)addr;
621}
622
623static inline void sg_kunmap_atomic(unsigned long addr)
624{
625 kunmap_atomic((void *)addr);
626}
627
628
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800629/* Assume the original sgl has enough room */
630static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
631 struct scatterlist *bounce_sgl,
632 unsigned int orig_sgl_count,
633 unsigned int bounce_sgl_count)
634{
635 int i;
636 int j = 0;
637 unsigned long src, dest;
638 unsigned int srclen, destlen, copylen;
639 unsigned int total_copied = 0;
640 unsigned long bounce_addr = 0;
641 unsigned long dest_addr = 0;
642 unsigned long flags;
643
644 local_irq_save(flags);
645
646 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700647 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800648 dest = dest_addr;
649 destlen = orig_sgl[i].length;
650
651 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700652 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800653
654 while (destlen) {
655 src = bounce_addr + bounce_sgl[j].offset;
656 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
657
658 copylen = min(srclen, destlen);
659 memcpy((void *)dest, (void *)src, copylen);
660
661 total_copied += copylen;
662 bounce_sgl[j].offset += copylen;
663 destlen -= copylen;
664 dest += copylen;
665
666 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
667 /* full */
Linus Torvalds9f393832012-03-21 09:40:26 -0700668 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800669 j++;
670
671 /*
672 * It is possible that the number of elements
673 * in the bounce buffer may not be equal to
674 * the number of elements in the original
675 * scatter list. Handle this correctly.
676 */
677
678 if (j == bounce_sgl_count) {
679 /*
680 * We are done; cleanup and return.
681 */
Linus Torvalds9f393832012-03-21 09:40:26 -0700682 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800683 local_irq_restore(flags);
684 return total_copied;
685 }
686
687 /* if we need to use another bounce buffer */
688 if (destlen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700689 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800690 } else if (destlen == 0 && i == orig_sgl_count - 1) {
691 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700692 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800693 }
694 }
695
Linus Torvalds9f393832012-03-21 09:40:26 -0700696 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800697 }
698
699 local_irq_restore(flags);
700
701 return total_copied;
702}
703
704/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
705static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
706 struct scatterlist *bounce_sgl,
707 unsigned int orig_sgl_count)
708{
709 int i;
710 int j = 0;
711 unsigned long src, dest;
712 unsigned int srclen, destlen, copylen;
713 unsigned int total_copied = 0;
714 unsigned long bounce_addr = 0;
715 unsigned long src_addr = 0;
716 unsigned long flags;
717
718 local_irq_save(flags);
719
720 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700721 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800722 src = src_addr;
723 srclen = orig_sgl[i].length;
724
725 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700726 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800727
728 while (srclen) {
729 /* assume bounce offset always == 0 */
730 dest = bounce_addr + bounce_sgl[j].length;
731 destlen = PAGE_SIZE - bounce_sgl[j].length;
732
733 copylen = min(srclen, destlen);
734 memcpy((void *)dest, (void *)src, copylen);
735
736 total_copied += copylen;
737 bounce_sgl[j].length += copylen;
738 srclen -= copylen;
739 src += copylen;
740
741 if (bounce_sgl[j].length == PAGE_SIZE) {
742 /* full..move to next entry */
Linus Torvalds9f393832012-03-21 09:40:26 -0700743 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800744 j++;
745
746 /* if we need to use another bounce buffer */
747 if (srclen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700748 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800749
750 } else if (srclen == 0 && i == orig_sgl_count - 1) {
751 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700752 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800753 }
754 }
755
Linus Torvalds9f393832012-03-21 09:40:26 -0700756 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800757 }
758
759 local_irq_restore(flags);
760
761 return total_copied;
762}
763
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700764static void handle_sc_creation(struct vmbus_channel *new_sc)
765{
766 struct hv_device *device = new_sc->primary_channel->device_obj;
767 struct storvsc_device *stor_device;
768 struct vmstorage_channel_properties props;
769
770 stor_device = get_out_stor_device(device);
771 if (!stor_device)
772 return;
773
774 if (stor_device->open_sub_channel == false)
775 return;
776
777 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
778
779 vmbus_open(new_sc,
780 storvsc_ringbuffer_size,
781 storvsc_ringbuffer_size,
782 (void *)&props,
783 sizeof(struct vmstorage_channel_properties),
784 storvsc_on_channel_callback, new_sc);
785}
786
787static void handle_multichannel_storage(struct hv_device *device, int max_chns)
788{
789 struct storvsc_device *stor_device;
790 int num_cpus = num_online_cpus();
791 int num_sc;
792 struct storvsc_cmd_request *request;
793 struct vstor_packet *vstor_packet;
794 int ret, t;
795
796 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
797 stor_device = get_out_stor_device(device);
798 if (!stor_device)
799 return;
800
801 request = &stor_device->init_request;
802 vstor_packet = &request->vstor_packet;
803
804 stor_device->open_sub_channel = true;
805 /*
806 * Establish a handler for dealing with subchannels.
807 */
808 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
809
810 /*
811 * Check to see if sub-channels have already been created. This
812 * can happen when this driver is re-loaded after unloading.
813 */
814
815 if (vmbus_are_subchannels_present(device->channel))
816 return;
817
818 stor_device->open_sub_channel = false;
819 /*
820 * Request the host to create sub-channels.
821 */
822 memset(request, 0, sizeof(struct storvsc_cmd_request));
823 init_completion(&request->wait_event);
824 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
825 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
826 vstor_packet->sub_channel_count = num_sc;
827
828 ret = vmbus_sendpacket(device->channel, vstor_packet,
829 (sizeof(struct vstor_packet) -
830 vmscsi_size_delta),
831 (unsigned long)request,
832 VM_PKT_DATA_INBAND,
833 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
834
835 if (ret != 0)
836 return;
837
838 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
839 if (t == 0)
840 return;
841
842 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
843 vstor_packet->status != 0)
844 return;
845
846 /*
847 * Now that we created the sub-channels, invoke the check; this
848 * may trigger the callback.
849 */
850 stor_device->open_sub_channel = true;
851 vmbus_are_subchannels_present(device->channel);
852}
853
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700854static int storvsc_channel_init(struct hv_device *device)
855{
856 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800857 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700858 struct vstor_packet *vstor_packet;
859 int ret, t;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700860 int max_chns;
861 bool process_sub_channels = false;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700862
863 stor_device = get_out_stor_device(device);
864 if (!stor_device)
865 return -ENODEV;
866
867 request = &stor_device->init_request;
868 vstor_packet = &request->vstor_packet;
869
870 /*
871 * Now, initiate the vsc/vsp initialization protocol on the open
872 * channel
873 */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800874 memset(request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700875 init_completion(&request->wait_event);
876 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
877 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
878
879 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700880 (sizeof(struct vstor_packet) -
881 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700882 (unsigned long)request,
883 VM_PKT_DATA_INBAND,
884 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
885 if (ret != 0)
886 goto cleanup;
887
888 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
889 if (t == 0) {
890 ret = -ETIMEDOUT;
891 goto cleanup;
892 }
893
894 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
895 vstor_packet->status != 0)
896 goto cleanup;
897
898
899 /* reuse the packet for version range supported */
900 memset(vstor_packet, 0, sizeof(struct vstor_packet));
901 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
902 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
903
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800904 vstor_packet->version.major_minor =
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700905 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800906
907 /*
908 * The revision number is only used in Windows; set it to 0.
909 */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800910 vstor_packet->version.revision = 0;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700911
912 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700913 (sizeof(struct vstor_packet) -
914 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700915 (unsigned long)request,
916 VM_PKT_DATA_INBAND,
917 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
918 if (ret != 0)
919 goto cleanup;
920
921 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
922 if (t == 0) {
923 ret = -ETIMEDOUT;
924 goto cleanup;
925 }
926
927 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
928 vstor_packet->status != 0)
929 goto cleanup;
930
931
932 memset(vstor_packet, 0, sizeof(struct vstor_packet));
933 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
934 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700935
936 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700937 (sizeof(struct vstor_packet) -
938 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700939 (unsigned long)request,
940 VM_PKT_DATA_INBAND,
941 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
942
943 if (ret != 0)
944 goto cleanup;
945
946 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
947 if (t == 0) {
948 ret = -ETIMEDOUT;
949 goto cleanup;
950 }
951
952 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
953 vstor_packet->status != 0)
954 goto cleanup;
955
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700956 /*
957 * Check to see if multi-channel support is there.
958 * Hosts that implement protocol version of 5.1 and above
959 * support multi-channel.
960 */
961 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
962 if ((vmbus_proto_version != VERSION_WIN7) &&
963 (vmbus_proto_version != VERSION_WS2008)) {
964 if (vstor_packet->storage_channel_properties.flags &
965 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
966 process_sub_channels = true;
967 }
968
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700969 memset(vstor_packet, 0, sizeof(struct vstor_packet));
970 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
971 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
972
973 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700974 (sizeof(struct vstor_packet) -
975 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700976 (unsigned long)request,
977 VM_PKT_DATA_INBAND,
978 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
979
980 if (ret != 0)
981 goto cleanup;
982
983 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
984 if (t == 0) {
985 ret = -ETIMEDOUT;
986 goto cleanup;
987 }
988
989 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
990 vstor_packet->status != 0)
991 goto cleanup;
992
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700993 if (process_sub_channels)
994 handle_multichannel_storage(device, max_chns);
995
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700996
997cleanup:
998 return ret;
999}
1000
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001001static void storvsc_handle_error(struct vmscsi_request *vm_srb,
1002 struct scsi_cmnd *scmnd,
1003 struct Scsi_Host *host,
1004 u8 asc, u8 ascq)
1005{
1006 struct storvsc_scan_work *wrk;
1007 void (*process_err_fn)(struct work_struct *work);
1008 bool do_work = false;
1009
1010 switch (vm_srb->srb_status) {
1011 case SRB_STATUS_ERROR:
1012 /*
1013 * If there is an error; offline the device since all
1014 * error recovery strategies would have already been
1015 * deployed on the host side. However, if the command
1016 * were a pass-through command deal with it appropriately.
1017 */
1018 switch (scmnd->cmnd[0]) {
1019 case ATA_16:
1020 case ATA_12:
1021 set_host_byte(scmnd, DID_PASSTHROUGH);
1022 break;
K. Y. Srinivasan3533f8602014-07-12 09:48:32 -07001023 /*
1024 * On Some Windows hosts TEST_UNIT_READY command can return
1025 * SRB_STATUS_ERROR, let the upper level code deal with it
1026 * based on the sense information.
1027 */
1028 case TEST_UNIT_READY:
1029 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001030 default:
1031 set_host_byte(scmnd, DID_TARGET_FAILURE);
1032 }
1033 break;
1034 case SRB_STATUS_INVALID_LUN:
1035 do_work = true;
1036 process_err_fn = storvsc_remove_lun;
1037 break;
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001038 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1039 if ((asc == 0x2a) && (ascq == 0x9)) {
1040 do_work = true;
1041 process_err_fn = storvsc_device_scan;
1042 /*
1043 * Retry the I/O that trigerred this.
1044 */
1045 set_host_byte(scmnd, DID_REQUEUE);
1046 }
1047 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001048 }
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001049
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001050 if (!do_work)
1051 return;
1052
1053 /*
1054 * We need to schedule work to process this error; schedule it.
1055 */
1056 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1057 if (!wrk) {
1058 set_host_byte(scmnd, DID_TARGET_FAILURE);
1059 return;
1060 }
1061
1062 wrk->host = host;
1063 wrk->lun = vm_srb->lun;
1064 INIT_WORK(&wrk->work, process_err_fn);
1065 schedule_work(&wrk->work);
1066}
1067
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001068
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001069static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001070{
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001071 struct scsi_cmnd *scmnd = cmd_request->cmd;
1072 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1073 void (*scsi_done_fn)(struct scsi_cmnd *);
1074 struct scsi_sense_hdr sense_hdr;
1075 struct vmscsi_request *vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001076 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001077 struct Scsi_Host *host;
1078 struct storvsc_device *stor_dev;
1079 struct hv_device *dev = host_dev->dev;
1080
1081 stor_dev = get_in_stor_device(dev);
1082 host = stor_dev->host;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001083
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001084 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001085 if (cmd_request->bounce_sgl_count) {
1086 if (vm_srb->data_in == READ_TYPE)
1087 copy_from_bounce_buffer(scsi_sglist(scmnd),
1088 cmd_request->bounce_sgl,
1089 scsi_sg_count(scmnd),
1090 cmd_request->bounce_sgl_count);
1091 destroy_bounce_buffer(cmd_request->bounce_sgl,
1092 cmd_request->bounce_sgl_count);
1093 }
1094
K. Y. Srinivasan42e22ca2012-04-05 12:26:52 -07001095 scmnd->result = vm_srb->scsi_status;
1096
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001097 if (scmnd->result) {
1098 if (scsi_normalize_sense(scmnd->sense_buffer,
1099 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1100 scsi_print_sense_hdr("storvsc", &sense_hdr);
1101 }
1102
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001103 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1104 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1105 sense_hdr.ascq);
1106
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001107 scsi_set_resid(scmnd,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001108 cmd_request->data_buffer.len -
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001109 vm_srb->data_transfer_length);
1110
1111 scsi_done_fn = scmnd->scsi_done;
1112
1113 scmnd->host_scribble = NULL;
1114 scmnd->scsi_done = NULL;
1115
1116 scsi_done_fn(scmnd);
1117
1118 mempool_free(cmd_request, memp->request_mempool);
1119}
1120
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001121static void storvsc_on_io_completion(struct hv_device *device,
1122 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001123 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001124{
1125 struct storvsc_device *stor_device;
1126 struct vstor_packet *stor_pkt;
1127
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001128 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001129 stor_pkt = &request->vstor_packet;
1130
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001131 /*
1132 * The current SCSI handling on the host side does
1133 * not correctly handle:
1134 * INQUIRY command with page code parameter set to 0x80
1135 * MODE_SENSE command with cmd[2] == 0x1c
1136 *
1137 * Setup srb and scsi status so this won't be fatal.
1138 * We do this so we can distinguish truly fatal failues
1139 * (srb status == 0x4) and off-line the device in that case.
1140 */
1141
1142 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -08001143 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001144 vstor_packet->vm_srb.scsi_status = 0;
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001145 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001146 }
1147
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001148
1149 /* Copy over the status...etc */
1150 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1151 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1152 stor_pkt->vm_srb.sense_info_length =
1153 vstor_packet->vm_srb.sense_info_length;
1154
1155 if (vstor_packet->vm_srb.scsi_status != 0 ||
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001156 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001157 dev_warn(&device->device,
1158 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1159 stor_pkt->vm_srb.cdb[0],
1160 vstor_packet->vm_srb.scsi_status,
1161 vstor_packet->vm_srb.srb_status);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001162 }
1163
1164 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1165 /* CHECK_CONDITION */
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001166 if (vstor_packet->vm_srb.srb_status &
1167 SRB_STATUS_AUTOSENSE_VALID) {
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001168 /* autosense data available */
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001169 dev_warn(&device->device,
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001170 "stor pkt %p autosense data valid - len %d\n",
1171 request,
1172 vstor_packet->vm_srb.sense_info_length);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001173
1174 memcpy(request->sense_buffer,
1175 vstor_packet->vm_srb.sense_data,
1176 vstor_packet->vm_srb.sense_info_length);
1177
1178 }
1179 }
1180
1181 stor_pkt->vm_srb.data_transfer_length =
1182 vstor_packet->vm_srb.data_transfer_length;
1183
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001184 storvsc_command_completion(request);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001185
1186 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1187 stor_device->drain_notify)
1188 wake_up(&stor_device->waiting_to_drain);
1189
1190
1191}
1192
1193static void storvsc_on_receive(struct hv_device *device,
1194 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001195 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001196{
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001197 struct storvsc_scan_work *work;
1198 struct storvsc_device *stor_device;
1199
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001200 switch (vstor_packet->operation) {
1201 case VSTOR_OPERATION_COMPLETE_IO:
1202 storvsc_on_io_completion(device, vstor_packet, request);
1203 break;
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001204
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001205 case VSTOR_OPERATION_REMOVE_DEVICE:
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001206 case VSTOR_OPERATION_ENUMERATE_BUS:
1207 stor_device = get_in_stor_device(device);
1208 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1209 if (!work)
1210 return;
1211
1212 INIT_WORK(&work->work, storvsc_bus_scan);
1213 work->host = stor_device->host;
1214 schedule_work(&work->work);
1215 break;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001216
1217 default:
1218 break;
1219 }
1220}
1221
1222static void storvsc_on_channel_callback(void *context)
1223{
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001224 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1225 struct hv_device *device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001226 struct storvsc_device *stor_device;
1227 u32 bytes_recvd;
1228 u64 request_id;
1229 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001230 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001231 int ret;
1232
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001233 if (channel->primary_channel != NULL)
1234 device = channel->primary_channel->device_obj;
1235 else
1236 device = channel->device_obj;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001237
1238 stor_device = get_in_stor_device(device);
1239 if (!stor_device)
1240 return;
1241
1242 do {
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001243 ret = vmbus_recvpacket(channel, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001244 ALIGN((sizeof(struct vstor_packet) -
1245 vmscsi_size_delta), 8),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001246 &bytes_recvd, &request_id);
1247 if (ret == 0 && bytes_recvd > 0) {
1248
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001249 request = (struct storvsc_cmd_request *)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001250 (unsigned long)request_id;
1251
1252 if ((request == &stor_device->init_request) ||
1253 (request == &stor_device->reset_request)) {
1254
1255 memcpy(&request->vstor_packet, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001256 (sizeof(struct vstor_packet) -
1257 vmscsi_size_delta));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001258 complete(&request->wait_event);
1259 } else {
1260 storvsc_on_receive(device,
1261 (struct vstor_packet *)packet,
1262 request);
1263 }
1264 } else {
1265 break;
1266 }
1267 } while (1);
1268
1269 return;
1270}
1271
1272static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1273{
1274 struct vmstorage_channel_properties props;
1275 int ret;
1276
1277 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1278
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001279 ret = vmbus_open(device->channel,
1280 ring_size,
1281 ring_size,
1282 (void *)&props,
1283 sizeof(struct vmstorage_channel_properties),
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001284 storvsc_on_channel_callback, device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001285
1286 if (ret != 0)
1287 return ret;
1288
1289 ret = storvsc_channel_init(device);
1290
1291 return ret;
1292}
1293
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001294static int storvsc_dev_remove(struct hv_device *device)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001295{
1296 struct storvsc_device *stor_device;
1297 unsigned long flags;
1298
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001299 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001300
1301 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1302 stor_device->destroy = true;
1303 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1304
1305 /*
1306 * At this point, all outbound traffic should be disable. We
1307 * only allow inbound traffic (responses) to proceed so that
1308 * outstanding requests can be completed.
1309 */
1310
1311 storvsc_wait_to_drain(stor_device);
1312
1313 /*
1314 * Since we have already drained, we don't need to busy wait
1315 * as was done in final_release_stor_device()
1316 * Note that we cannot set the ext pointer to NULL until
1317 * we have drained - to drain the outgoing packets, we need to
1318 * allow incoming packets.
1319 */
1320 spin_lock_irqsave(&device->channel->inbound_lock, flags);
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001321 hv_set_drvdata(device, NULL);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001322 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1323
1324 /* Close the channel */
1325 vmbus_close(device->channel);
1326
1327 kfree(stor_device);
1328 return 0;
1329}
1330
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001331static int storvsc_do_io(struct hv_device *device,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001332 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001333{
1334 struct storvsc_device *stor_device;
1335 struct vstor_packet *vstor_packet;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001336 struct vmbus_channel *outgoing_channel;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001337 int ret = 0;
1338
1339 vstor_packet = &request->vstor_packet;
1340 stor_device = get_out_stor_device(device);
1341
1342 if (!stor_device)
1343 return -ENODEV;
1344
1345
1346 request->device = device;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001347 /*
1348 * Select an an appropriate channel to send the request out.
1349 */
1350
1351 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001352
1353
1354 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1355
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001356 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1357 vmscsi_size_delta);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001358
1359
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001360 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001361
1362
1363 vstor_packet->vm_srb.data_transfer_length =
1364 request->data_buffer.len;
1365
1366 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1367
1368 if (request->data_buffer.len) {
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001369 ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001370 &request->data_buffer,
1371 vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001372 (sizeof(struct vstor_packet) -
1373 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001374 (unsigned long)request);
1375 } else {
1376 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001377 (sizeof(struct vstor_packet) -
1378 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001379 (unsigned long)request,
1380 VM_PKT_DATA_INBAND,
1381 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1382 }
1383
1384 if (ret != 0)
1385 return ret;
1386
1387 atomic_inc(&stor_device->num_outstanding_req);
1388
1389 return ret;
1390}
1391
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001392static int storvsc_device_alloc(struct scsi_device *sdevice)
1393{
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001394 struct stor_mem_pools *memp;
1395 int number = STORVSC_MIN_BUF_NR;
1396
1397 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1398 if (!memp)
1399 return -ENOMEM;
1400
1401 memp->request_pool =
1402 kmem_cache_create(dev_name(&sdevice->sdev_dev),
1403 sizeof(struct storvsc_cmd_request), 0,
1404 SLAB_HWCACHE_ALIGN, NULL);
1405
1406 if (!memp->request_pool)
1407 goto err0;
1408
1409 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1410 mempool_free_slab,
1411 memp->request_pool);
1412
1413 if (!memp->request_mempool)
1414 goto err1;
1415
1416 sdevice->hostdata = memp;
1417
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001418 return 0;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001419
1420err1:
1421 kmem_cache_destroy(memp->request_pool);
1422
1423err0:
1424 kfree(memp);
1425 return -ENOMEM;
1426}
1427
1428static void storvsc_device_destroy(struct scsi_device *sdevice)
1429{
1430 struct stor_mem_pools *memp = sdevice->hostdata;
1431
Ales Novakb12bb602014-02-27 11:03:30 +01001432 if (!memp)
1433 return;
1434
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001435 mempool_destroy(memp->request_mempool);
1436 kmem_cache_destroy(memp->request_pool);
1437 kfree(memp);
1438 sdevice->hostdata = NULL;
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001439}
1440
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001441static int storvsc_device_configure(struct scsi_device *sdevice)
1442{
1443 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1444 STORVSC_MAX_IO_REQUESTS);
1445
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001446 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1447
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001448 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001449
K. Y. Srinivasan893def32013-06-04 12:05:05 -07001450 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1451
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001452 sdevice->no_write_same = 1;
1453
K. Y. Srinivasanf3cfabc2014-07-21 16:06:01 -07001454 /*
1455 * Add blist flags to permit the reading of the VPD pages even when
1456 * the target may claim SPC-2 compliance. MSFT targets currently
1457 * claim SPC-2 compliance while they implement post SPC-2 features.
1458 * With this patch we can correctly handle WRITE_SAME_16 issues.
1459 */
1460 sdevice->sdev_bflags |= msft_blist_flags;
1461
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001462 return 0;
1463}
1464
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001465static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1466 sector_t capacity, int *info)
1467{
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001468 sector_t nsect = capacity;
1469 sector_t cylinders = nsect;
1470 int heads, sectors_pt;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001471
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001472 /*
1473 * We are making up these values; let us keep it simple.
1474 */
1475 heads = 0xff;
1476 sectors_pt = 0x3f; /* Sectors per track */
1477 sector_div(cylinders, heads * sectors_pt);
1478 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1479 cylinders = 0xffff;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001480
1481 info[0] = heads;
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001482 info[1] = sectors_pt;
1483 info[2] = (int)cylinders;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001484
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001485 return 0;
1486}
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001487
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001488static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001489{
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001490 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1491 struct hv_device *device = host_dev->dev;
1492
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001493 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001494 struct storvsc_cmd_request *request;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001495 struct vstor_packet *vstor_packet;
1496 int ret, t;
1497
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001498
K. Y. Srinivasan1eaaddf2011-08-27 11:31:03 -07001499 stor_device = get_out_stor_device(device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001500 if (!stor_device)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001501 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001502
1503 request = &stor_device->reset_request;
1504 vstor_packet = &request->vstor_packet;
1505
1506 init_completion(&request->wait_event);
1507
1508 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1509 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1510 vstor_packet->vm_srb.path_id = stor_device->path_id;
1511
1512 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001513 (sizeof(struct vstor_packet) -
1514 vmscsi_size_delta),
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001515 (unsigned long)&stor_device->reset_request,
1516 VM_PKT_DATA_INBAND,
1517 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1518 if (ret != 0)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001519 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001520
K. Y. Srinivasan46d2eb62011-06-16 13:16:36 -07001521 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001522 if (t == 0)
1523 return TIMEOUT_ERROR;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001524
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001525
1526 /*
1527 * At this point, all outstanding requests in the adapter
1528 * should have been flushed out and return to us
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001529 * There is a potential race here where the host may be in
1530 * the process of responding when we return from here.
1531 * Just wait for all in-transit packets to be accounted for
1532 * before we return from here.
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001533 */
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001534 storvsc_wait_to_drain(stor_device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001535
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001536 return SUCCESS;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001537}
1538
K. Y. Srinivasan56b26e62014-07-12 09:48:30 -07001539/*
1540 * The host guarantees to respond to each command, although I/O latencies might
1541 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1542 * chance to perform EH.
1543 */
1544static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
1545{
1546 return BLK_EH_RESET_TIMER;
1547}
1548
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001549static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001550{
1551 bool allowed = true;
1552 u8 scsi_op = scmnd->cmnd[0];
1553
1554 switch (scsi_op) {
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001555 /* the host does not handle WRITE_SAME, log accident usage */
1556 case WRITE_SAME:
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001557 /*
1558 * smartd sends this command and the host does not handle
1559 * this. So, don't send it.
1560 */
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001561 case SET_WINDOW:
K. Y. Srinivasan59e00e72011-11-08 09:01:42 -08001562 scmnd->result = ILLEGAL_REQUEST << 16;
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001563 allowed = false;
1564 break;
1565 default:
1566 break;
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001567 }
1568 return allowed;
1569}
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001570
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001571static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001572{
1573 int ret;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001574 struct hv_host_device *host_dev = shost_priv(host);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001575 struct hv_device *dev = host_dev->dev;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001576 struct storvsc_cmd_request *cmd_request;
1577 unsigned int request_size = 0;
1578 int i;
1579 struct scatterlist *sgl;
1580 unsigned int sg_count = 0;
1581 struct vmscsi_request *vm_srb;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001582 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001583
K. Y. Srinivasan8caf92d2014-07-12 09:48:28 -07001584 if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
1585 /*
1586 * On legacy hosts filter unimplemented commands.
1587 * Future hosts are expected to correctly handle
1588 * unsupported commands. Furthermore, it is
1589 * possible that some of the currently
1590 * unsupported commands maybe supported in
1591 * future versions of the host.
1592 */
1593 if (!storvsc_scsi_cmd_ok(scmnd)) {
1594 scmnd->scsi_done(scmnd);
1595 return 0;
1596 }
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001597 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001598
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001599 request_size = sizeof(struct storvsc_cmd_request);
1600
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001601 cmd_request = mempool_alloc(memp->request_mempool,
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001602 GFP_ATOMIC);
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001603
1604 /*
1605 * We might be invoked in an interrupt context; hence
1606 * mempool_alloc() can fail.
1607 */
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001608 if (!cmd_request)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001609 return SCSI_MLQUEUE_DEVICE_BUSY;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001610
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001611 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001612
1613 /* Setup the cmd request */
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001614 cmd_request->cmd = scmnd;
1615
1616 scmnd->host_scribble = (unsigned char *)cmd_request;
1617
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001618 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001619 vm_srb->win8_extension.time_out_value = 60;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001620
K. Y. Srinivasanf885fb72014-07-12 09:48:31 -07001621 vm_srb->win8_extension.srb_flags |=
1622 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1623 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001624
1625 /* Build the SRB */
1626 switch (scmnd->sc_data_direction) {
1627 case DMA_TO_DEVICE:
1628 vm_srb->data_in = WRITE_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001629 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001630 break;
1631 case DMA_FROM_DEVICE:
1632 vm_srb->data_in = READ_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001633 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001634 break;
1635 default:
1636 vm_srb->data_in = UNKNOWN_TYPE;
K. Y. Srinivasanf885fb72014-07-12 09:48:31 -07001637 vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN |
1638 SRB_FLAGS_DATA_OUT);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001639 break;
1640 }
1641
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001642
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001643 vm_srb->port_number = host_dev->port;
1644 vm_srb->path_id = scmnd->device->channel;
1645 vm_srb->target_id = scmnd->device->id;
1646 vm_srb->lun = scmnd->device->lun;
1647
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001648 vm_srb->cdb_length = scmnd->cmd_len;
1649
1650 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1651
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001652 cmd_request->sense_buffer = scmnd->sense_buffer;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001653
1654
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001655 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001656 if (scsi_sg_count(scmnd)) {
1657 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1658 sg_count = scsi_sg_count(scmnd);
1659
1660 /* check if we need to bounce the sgl */
1661 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1662 cmd_request->bounce_sgl =
1663 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
K. Y. Srinivasan6e8087a2011-12-07 07:15:52 -08001664 scsi_bufflen(scmnd),
1665 vm_srb->data_in);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001666 if (!cmd_request->bounce_sgl) {
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001667 ret = SCSI_MLQUEUE_HOST_BUSY;
1668 goto queue_error;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001669 }
1670
1671 cmd_request->bounce_sgl_count =
1672 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1673 PAGE_SHIFT;
1674
K. Y. Srinivasanfa23b8c2011-08-27 11:31:21 -07001675 if (vm_srb->data_in == WRITE_TYPE)
1676 copy_to_bounce_buffer(sgl,
1677 cmd_request->bounce_sgl,
1678 scsi_sg_count(scmnd));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001679
1680 sgl = cmd_request->bounce_sgl;
1681 sg_count = cmd_request->bounce_sgl_count;
1682 }
1683
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001684 cmd_request->data_buffer.offset = sgl[0].offset;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001685
1686 for (i = 0; i < sg_count; i++)
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001687 cmd_request->data_buffer.pfn_array[i] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001688 page_to_pfn(sg_page((&sgl[i])));
1689
1690 } else if (scsi_sglist(scmnd)) {
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001691 cmd_request->data_buffer.offset =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001692 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001693 cmd_request->data_buffer.pfn_array[0] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001694 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1695 }
1696
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001697 /* Invokes the vsc to start an IO */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001698 ret = storvsc_do_io(dev, cmd_request);
K. Y. Srinivasan636f0fd2011-05-10 07:54:50 -07001699
K. Y. Srinivasand2598f02011-08-25 09:48:58 -07001700 if (ret == -EAGAIN) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001701 /* no more space */
1702
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001703 if (cmd_request->bounce_sgl_count) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001704 destroy_bounce_buffer(cmd_request->bounce_sgl,
K. Y. Srinivasan70691ec2011-08-27 11:31:29 -07001705 cmd_request->bounce_sgl_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001706
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001707 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1708 goto queue_error;
1709 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001710 }
1711
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001712 return 0;
1713
1714queue_error:
1715 mempool_free(cmd_request, memp->request_mempool);
1716 scmnd->host_scribble = NULL;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001717 return ret;
1718}
1719
Hank Janssenbef4a342009-07-13 16:01:31 -07001720static struct scsi_host_template scsi_driver = {
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001721 .module = THIS_MODULE,
1722 .name = "storvsc_host_t",
1723 .bios_param = storvsc_get_chs,
1724 .queuecommand = storvsc_queuecommand,
1725 .eh_host_reset_handler = storvsc_host_reset_handler,
K. Y. Srinivasan56b26e62014-07-12 09:48:30 -07001726 .eh_timed_out = storvsc_eh_timed_out,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001727 .slave_alloc = storvsc_device_alloc,
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001728 .slave_destroy = storvsc_device_destroy,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001729 .slave_configure = storvsc_device_configure,
K. Y. Srinivasan52f96142014-07-12 09:48:27 -07001730 .cmd_per_lun = 255,
Lars Lindley0686e4f2010-03-11 23:51:23 +01001731 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001732 .this_id = -1,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001733 /* no use setting to 0 since ll_blk_rw reset it to 1 */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001734 /* currently 32 */
1735 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
K. Y. Srinivasan039db522011-12-01 04:59:16 -08001736 .use_clustering = DISABLE_CLUSTERING,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001737 /* Make sure we dont get a sg segment crosses a page boundary */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001738 .dma_boundary = PAGE_SIZE-1,
Martin K. Petersen54b2b502013-10-23 06:25:40 -04001739 .no_write_same = 1,
Hank Janssenbef4a342009-07-13 16:01:31 -07001740};
1741
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001742enum {
1743 SCSI_GUID,
1744 IDE_GUID,
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001745 SFC_GUID,
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001746};
1747
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001748static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001749 /* SCSI guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001750 { HV_SCSI_GUID,
1751 .driver_data = SCSI_GUID
1752 },
K. Y. Srinivasan21e37742011-08-27 11:31:18 -07001753 /* IDE guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001754 { HV_IDE_GUID,
1755 .driver_data = IDE_GUID
1756 },
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001757 /* Fibre Channel GUID */
1758 {
1759 HV_SYNTHFC_GUID,
1760 .driver_data = SFC_GUID
1761 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001762 { },
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001763};
Hank Janssenbef4a342009-07-13 16:01:31 -07001764
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001765MODULE_DEVICE_TABLE(vmbus, id_table);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001766
K. Y. Srinivasan84946892011-09-13 10:59:38 -07001767static int storvsc_probe(struct hv_device *device,
1768 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001769{
1770 int ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001771 struct Scsi_Host *host;
1772 struct hv_host_device *host_dev;
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001773 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001774 int target = 0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001775 struct storvsc_device *stor_device;
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001776
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001777 /*
1778 * Based on the windows host we are running on,
1779 * set state to properly communicate with the host.
1780 */
1781
K. Y. Srinivasanadb6f9e2014-07-12 09:48:29 -07001782 switch (vmbus_proto_version) {
1783 case VERSION_WS2008:
1784 case VERSION_WIN7:
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001785 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1786 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1787 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1788 vmstor_current_minor = VMSTOR_WIN7_MINOR;
K. Y. Srinivasanadb6f9e2014-07-12 09:48:29 -07001789 break;
1790 default:
1791 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1792 vmscsi_size_delta = 0;
1793 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1794 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1795 break;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001796 }
1797
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -07001798 if (dev_id->driver_data == SFC_GUID)
1799 scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
1800 STORVSC_FC_MAX_TARGETS);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001801 host = scsi_host_alloc(&scsi_driver,
1802 sizeof(struct hv_host_device));
1803 if (!host)
1804 return -ENOMEM;
1805
K. Y. Srinivasan7f33f302011-11-08 09:01:44 -08001806 host_dev = shost_priv(host);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001807 memset(host_dev, 0, sizeof(struct hv_host_device));
1808
1809 host_dev->port = host->host_no;
1810 host_dev->dev = device;
1811
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001812
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001813 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001814 if (!stor_device) {
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001815 ret = -ENOMEM;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001816 goto err_out0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001817 }
1818
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001819 stor_device->destroy = false;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001820 stor_device->open_sub_channel = false;
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001821 init_waitqueue_head(&stor_device->waiting_to_drain);
1822 stor_device->device = device;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001823 stor_device->host = host;
1824 hv_set_drvdata(device, stor_device);
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001825
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001826 stor_device->port_number = host->host_no;
1827 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001828 if (ret)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001829 goto err_out1;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001830
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001831 host_dev->path = stor_device->path_id;
1832 host_dev->target = stor_device->target_id;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001833
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -07001834 switch (dev_id->driver_data) {
1835 case SFC_GUID:
1836 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
1837 host->max_id = STORVSC_FC_MAX_TARGETS;
1838 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
1839 break;
1840
1841 case SCSI_GUID:
1842 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1843 host->max_id = STORVSC_MAX_TARGETS;
1844 host->max_channel = STORVSC_MAX_CHANNELS - 1;
1845 break;
1846
1847 default:
1848 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1849 host->max_id = STORVSC_IDE_MAX_TARGETS;
1850 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
1851 break;
1852 }
Mike Sterlingcf55f4a2011-09-06 16:10:55 -07001853 /* max cmd length */
1854 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001855
1856 /* Register the HBA and start the scsi bus scan */
1857 ret = scsi_add_host(host, &device->device);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001858 if (ret != 0)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001859 goto err_out2;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001860
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001861 if (!dev_is_ide) {
1862 scsi_scan_host(host);
K. Y. Srinivasan59d22952012-01-12 12:37:55 -08001863 } else {
1864 target = (device->dev_instance.b[5] << 8 |
1865 device->dev_instance.b[4]);
1866 ret = scsi_add_device(host, 0, target, 0);
1867 if (ret) {
1868 scsi_remove_host(host);
1869 goto err_out2;
1870 }
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001871 }
1872 return 0;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001873
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001874err_out2:
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001875 /*
1876 * Once we have connected with the host, we would need to
1877 * to invoke storvsc_dev_remove() to rollback this state and
1878 * this call also frees up the stor_device; hence the jump around
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001879 * err_out1 label.
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001880 */
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001881 storvsc_dev_remove(device);
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001882 goto err_out0;
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001883
1884err_out1:
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001885 kfree(stor_device);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001886
1887err_out0:
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001888 scsi_host_put(host);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001889 return ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001890}
1891
K. Y. Srinivasanddcbf652012-01-12 12:37:59 -08001892static int storvsc_remove(struct hv_device *dev)
1893{
1894 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1895 struct Scsi_Host *host = stor_device->host;
1896
1897 scsi_remove_host(host);
1898 storvsc_dev_remove(dev);
1899 scsi_host_put(host);
1900
1901 return 0;
1902}
1903
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001904static struct hv_driver storvsc_drv = {
K. Y. Srinivasanfafb0ef2011-11-08 09:01:46 -08001905 .name = KBUILD_MODNAME,
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001906 .id_table = id_table,
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001907 .probe = storvsc_probe,
1908 .remove = storvsc_remove,
K. Y. Srinivasan39ae6fa2011-05-10 07:54:46 -07001909};
K. Y. Srinivasan7bd05b92011-05-10 07:54:45 -07001910
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001911static int __init storvsc_drv_init(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001912{
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001913 u32 max_outstanding_req_per_channel;
1914
1915 /*
1916 * Divide the ring buffer data size (which is 1 page less
1917 * than the ring buffer size since that page is reserved for
1918 * the ring buffer indices) by the max request size (which is
1919 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1920 */
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001921 max_outstanding_req_per_channel =
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001922 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1923 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001924 sizeof(struct vstor_packet) + sizeof(u64) -
1925 vmscsi_size_delta,
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001926 sizeof(u64)));
Hank Janssenbef4a342009-07-13 16:01:31 -07001927
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001928 if (max_outstanding_req_per_channel <
K. Y. Srinivasanf8feed02011-05-10 07:54:24 -07001929 STORVSC_MAX_IO_REQUESTS)
K. Y. Srinivasanb06efc12011-08-25 09:49:10 -07001930 return -EINVAL;
Hank Janssenbef4a342009-07-13 16:01:31 -07001931
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001932 return vmbus_driver_register(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001933}
1934
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001935static void __exit storvsc_drv_exit(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001936{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001937 vmbus_driver_unregister(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001938}
1939
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001940MODULE_LICENSE("GPL");
Stephen Hemminger3afc7cc32010-05-06 21:44:45 -07001941MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001942module_init(storvsc_drv_init);
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001943module_exit(storvsc_drv_exit);