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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. Srinivasan56b26e62014-07-12 09:48:30 -070035#include <linux/blkdev.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
K. Y. Srinivasanb9ec3a52015-03-27 00:27:14 -0700311static int storvsc_ringbuffer_size = (256 * PAGE_SIZE);
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -0700312static u32 max_outstanding_req_per_channel;
313
314static int storvsc_vcpus_per_sub_channel = 4;
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800315
316module_param(storvsc_ringbuffer_size, int, S_IRUGO);
317MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
318
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -0700319module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO);
320MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");
K. Y. Srinivasan893def32013-06-04 12:05:05 -0700321/*
322 * Timeout in seconds for all devices managed by this driver.
323 */
324static int storvsc_timeout = 180;
325
K. Y. Srinivasanf3cfabc2014-07-21 16:06:01 -0700326static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
327
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800328
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700329static void storvsc_on_channel_callback(void *context);
330
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700331#define STORVSC_MAX_LUNS_PER_TARGET 255
332#define STORVSC_MAX_TARGETS 2
333#define STORVSC_MAX_CHANNELS 8
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800334
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700335#define STORVSC_FC_MAX_LUNS_PER_TARGET 255
336#define STORVSC_FC_MAX_TARGETS 128
337#define STORVSC_FC_MAX_CHANNELS 8
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800338
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -0700339#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
340#define STORVSC_IDE_MAX_TARGETS 1
341#define STORVSC_IDE_MAX_CHANNELS 1
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800342
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800343struct storvsc_cmd_request {
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800344 struct scsi_cmnd *cmd;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700345
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800346 unsigned int bounce_sgl_count;
347 struct scatterlist *bounce_sgl;
348
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700349 struct hv_device *device;
350
351 /* Synchronize the request/response if needed */
352 struct completion wait_event;
353
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -0700354 struct vmbus_channel_packet_multipage_buffer mpb;
355 struct vmbus_packet_mpb_array *payload;
356 u32 payload_sz;
357
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700358 struct vstor_packet vstor_packet;
359};
360
361
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700362/* A storvsc device is a device object that contains a vmbus channel */
363struct storvsc_device {
364 struct hv_device *device;
365
366 bool destroy;
367 bool drain_notify;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700368 bool open_sub_channel;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700369 atomic_t num_outstanding_req;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700370 struct Scsi_Host *host;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700371
372 wait_queue_head_t waiting_to_drain;
373
374 /*
375 * Each unique Port/Path/Target represents 1 channel ie scsi
376 * controller. In reality, the pathid, targetid is always 0
377 * and the port is set by us
378 */
379 unsigned int port_number;
380 unsigned char path_id;
381 unsigned char target_id;
382
K. Y. Srinivasan5117b932015-03-27 00:27:17 -0700383 /*
384 * Max I/O, the device can support.
385 */
386 u32 max_transfer_bytes;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700387 /* 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 hv_host_device {
393 struct hv_device *dev;
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700394 unsigned int port;
395 unsigned char path;
396 unsigned char target;
397};
398
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800399struct storvsc_scan_work {
400 struct work_struct work;
401 struct Scsi_Host *host;
402 uint lun;
403};
404
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800405static void storvsc_device_scan(struct work_struct *work)
406{
407 struct storvsc_scan_work *wrk;
408 uint lun;
409 struct scsi_device *sdev;
410
411 wrk = container_of(work, struct storvsc_scan_work, work);
412 lun = wrk->lun;
413
414 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
415 if (!sdev)
416 goto done;
417 scsi_rescan_device(&sdev->sdev_gendev);
418 scsi_device_put(sdev);
419
420done:
421 kfree(wrk);
422}
423
K. Y. Srinivasan2a09ed32014-12-16 13:21:42 -0800424static void storvsc_host_scan(struct work_struct *work)
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800425{
426 struct storvsc_scan_work *wrk;
K. Y. Srinivasan2a09ed32014-12-16 13:21:42 -0800427 struct Scsi_Host *host;
K. Y. Srinivasan34a716b2014-12-16 13:21:43 -0800428 struct scsi_device *sdev;
429 unsigned long flags;
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800430
431 wrk = container_of(work, struct storvsc_scan_work, work);
K. Y. Srinivasan2a09ed32014-12-16 13:21:42 -0800432 host = wrk->host;
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800433
K. Y. Srinivasan34a716b2014-12-16 13:21:43 -0800434 /*
435 * Before scanning the host, first check to see if any of the
436 * currrently known devices have been hot removed. We issue a
437 * "unit ready" command against all currently known devices.
438 * This I/O will result in an error for devices that have been
439 * removed. As part of handling the I/O error, we remove the device.
440 *
441 * When a LUN is added or removed, the host sends us a signal to
442 * scan the host. Thus we are forced to discover the LUNs that
443 * may have been removed this way.
444 */
445 mutex_lock(&host->scan_mutex);
446 spin_lock_irqsave(host->host_lock, flags);
447 list_for_each_entry(sdev, &host->__devices, siblings) {
448 spin_unlock_irqrestore(host->host_lock, flags);
449 scsi_test_unit_ready(sdev, 1, 1, NULL);
450 spin_lock_irqsave(host->host_lock, flags);
451 continue;
452 }
453 spin_unlock_irqrestore(host->host_lock, flags);
454 mutex_unlock(&host->scan_mutex);
455 /*
456 * Now scan the host to discover LUNs that may have been added.
457 */
K. Y. Srinivasan2a09ed32014-12-16 13:21:42 -0800458 scsi_scan_host(host);
459
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800460 kfree(wrk);
461}
462
K. Y. Srinivasanb4017312011-11-08 09:01:50 -0800463static void storvsc_remove_lun(struct work_struct *work)
464{
465 struct storvsc_scan_work *wrk;
466 struct scsi_device *sdev;
467
468 wrk = container_of(work, struct storvsc_scan_work, work);
469 if (!scsi_host_get(wrk->host))
470 goto done;
471
472 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
473
474 if (sdev) {
475 scsi_remove_device(sdev);
476 scsi_device_put(sdev);
477 }
478 scsi_host_put(wrk->host);
479
480done:
481 kfree(wrk);
482}
483
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800484/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800485 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
486 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
487 */
488
489static inline u16 storvsc_get_version(u8 major, u8 minor)
490{
491 u16 version;
492
493 version = ((major << 8) | minor);
494 return version;
495}
496
497/*
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800498 * We can get incoming messages from the host that are not in response to
499 * messages that we have sent out. An example of this would be messages
500 * received by the guest to notify dynamic addition/removal of LUNs. To
501 * deal with potential race conditions where the driver may be in the
502 * midst of being unloaded when we might receive an unsolicited message
503 * from the host, we have implemented a mechanism to gurantee sequential
504 * consistency:
505 *
506 * 1) Once the device is marked as being destroyed, we will fail all
507 * outgoing messages.
508 * 2) We permit incoming messages when the device is being destroyed,
509 * only to properly account for messages already sent out.
510 */
511
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700512static inline struct storvsc_device *get_out_stor_device(
513 struct hv_device *device)
514{
515 struct storvsc_device *stor_device;
516
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700517 stor_device = hv_get_drvdata(device);
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700518
519 if (stor_device && stor_device->destroy)
520 stor_device = NULL;
521
522 return stor_device;
523}
524
525
526static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
527{
528 dev->drain_notify = true;
529 wait_event(dev->waiting_to_drain,
530 atomic_read(&dev->num_outstanding_req) == 0);
531 dev->drain_notify = false;
532}
Hank Janssenbef4a342009-07-13 16:01:31 -0700533
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700534static inline struct storvsc_device *get_in_stor_device(
535 struct hv_device *device)
536{
537 struct storvsc_device *stor_device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700538
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700539 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700540
541 if (!stor_device)
542 goto get_in_err;
543
544 /*
545 * If the device is being destroyed; allow incoming
546 * traffic only to cleanup outstanding requests.
547 */
548
549 if (stor_device->destroy &&
550 (atomic_read(&stor_device->num_outstanding_req) == 0))
551 stor_device = NULL;
552
553get_in_err:
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700554 return stor_device;
555
556}
557
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800558static void destroy_bounce_buffer(struct scatterlist *sgl,
559 unsigned int sg_count)
560{
561 int i;
562 struct page *page_buf;
563
564 for (i = 0; i < sg_count; i++) {
565 page_buf = sg_page((&sgl[i]));
566 if (page_buf != NULL)
567 __free_page(page_buf);
568 }
569
570 kfree(sgl);
571}
572
573static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
574{
575 int i;
576
577 /* No need to check */
578 if (sg_count < 2)
579 return -1;
580
581 /* We have at least 2 sg entries */
582 for (i = 0; i < sg_count; i++) {
583 if (i == 0) {
584 /* make sure 1st one does not have hole */
585 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
586 return i;
587 } else if (i == sg_count - 1) {
588 /* make sure last one does not have hole */
589 if (sgl[i].offset != 0)
590 return i;
591 } else {
592 /* make sure no hole in the middle */
593 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
594 return i;
595 }
596 }
597 return -1;
598}
599
600static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
601 unsigned int sg_count,
602 unsigned int len,
603 int write)
604{
605 int i;
606 int num_pages;
607 struct scatterlist *bounce_sgl;
608 struct page *page_buf;
609 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
610
611 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
612
613 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
614 if (!bounce_sgl)
615 return NULL;
616
K. Y. Srinivasan9d2696e2013-02-06 05:15:28 -0800617 sg_init_table(bounce_sgl, num_pages);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800618 for (i = 0; i < num_pages; i++) {
619 page_buf = alloc_page(GFP_ATOMIC);
620 if (!page_buf)
621 goto cleanup;
622 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
623 }
624
625 return bounce_sgl;
626
627cleanup:
628 destroy_bounce_buffer(bounce_sgl, num_pages);
629 return NULL;
630}
631
632/* Assume the original sgl has enough room */
633static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
634 struct scatterlist *bounce_sgl,
635 unsigned int orig_sgl_count,
636 unsigned int bounce_sgl_count)
637{
638 int i;
639 int j = 0;
640 unsigned long src, dest;
641 unsigned int srclen, destlen, copylen;
642 unsigned int total_copied = 0;
643 unsigned long bounce_addr = 0;
644 unsigned long dest_addr = 0;
645 unsigned long flags;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700646 struct scatterlist *cur_dest_sgl;
647 struct scatterlist *cur_src_sgl;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800648
649 local_irq_save(flags);
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700650 cur_dest_sgl = orig_sgl;
651 cur_src_sgl = bounce_sgl;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800652 for (i = 0; i < orig_sgl_count; i++) {
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700653 dest_addr = (unsigned long)
654 kmap_atomic(sg_page(cur_dest_sgl)) +
655 cur_dest_sgl->offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800656 dest = dest_addr;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700657 destlen = cur_dest_sgl->length;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800658
659 if (bounce_addr == 0)
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700660 bounce_addr = (unsigned long)kmap_atomic(
661 sg_page(cur_src_sgl));
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800662
663 while (destlen) {
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700664 src = bounce_addr + cur_src_sgl->offset;
665 srclen = cur_src_sgl->length - cur_src_sgl->offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800666
667 copylen = min(srclen, destlen);
668 memcpy((void *)dest, (void *)src, copylen);
669
670 total_copied += copylen;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700671 cur_src_sgl->offset += copylen;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800672 destlen -= copylen;
673 dest += copylen;
674
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700675 if (cur_src_sgl->offset == cur_src_sgl->length) {
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800676 /* full */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700677 kunmap_atomic((void *)bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800678 j++;
679
680 /*
681 * It is possible that the number of elements
682 * in the bounce buffer may not be equal to
683 * the number of elements in the original
684 * scatter list. Handle this correctly.
685 */
686
687 if (j == bounce_sgl_count) {
688 /*
689 * We are done; cleanup and return.
690 */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700691 kunmap_atomic((void *)(dest_addr -
692 cur_dest_sgl->offset));
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800693 local_irq_restore(flags);
694 return total_copied;
695 }
696
697 /* if we need to use another bounce buffer */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700698 if (destlen || i != orig_sgl_count - 1) {
699 cur_src_sgl = sg_next(cur_src_sgl);
700 bounce_addr = (unsigned long)
701 kmap_atomic(
702 sg_page(cur_src_sgl));
703 }
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800704 } else if (destlen == 0 && i == orig_sgl_count - 1) {
705 /* unmap the last bounce that is < PAGE_SIZE */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700706 kunmap_atomic((void *)bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800707 }
708 }
709
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700710 kunmap_atomic((void *)(dest_addr - cur_dest_sgl->offset));
711 cur_dest_sgl = sg_next(cur_dest_sgl);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800712 }
713
714 local_irq_restore(flags);
715
716 return total_copied;
717}
718
719/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
720static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
721 struct scatterlist *bounce_sgl,
722 unsigned int orig_sgl_count)
723{
724 int i;
725 int j = 0;
726 unsigned long src, dest;
727 unsigned int srclen, destlen, copylen;
728 unsigned int total_copied = 0;
729 unsigned long bounce_addr = 0;
730 unsigned long src_addr = 0;
731 unsigned long flags;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700732 struct scatterlist *cur_src_sgl;
733 struct scatterlist *cur_dest_sgl;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800734
735 local_irq_save(flags);
736
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700737 cur_src_sgl = orig_sgl;
738 cur_dest_sgl = bounce_sgl;
739
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800740 for (i = 0; i < orig_sgl_count; i++) {
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700741 src_addr = (unsigned long)
742 kmap_atomic(sg_page(cur_src_sgl)) +
743 cur_src_sgl->offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800744 src = src_addr;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700745 srclen = cur_src_sgl->length;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800746
747 if (bounce_addr == 0)
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700748 bounce_addr = (unsigned long)
749 kmap_atomic(sg_page(cur_dest_sgl));
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800750
751 while (srclen) {
752 /* assume bounce offset always == 0 */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700753 dest = bounce_addr + cur_dest_sgl->length;
754 destlen = PAGE_SIZE - cur_dest_sgl->length;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800755
756 copylen = min(srclen, destlen);
757 memcpy((void *)dest, (void *)src, copylen);
758
759 total_copied += copylen;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700760 cur_dest_sgl->length += copylen;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800761 srclen -= copylen;
762 src += copylen;
763
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700764 if (cur_dest_sgl->length == PAGE_SIZE) {
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800765 /* full..move to next entry */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700766 kunmap_atomic((void *)bounce_addr);
K. Y. Srinivasan8de58072015-03-27 00:27:18 -0700767 bounce_addr = 0;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800768 j++;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800769 }
K. Y. Srinivasan8de58072015-03-27 00:27:18 -0700770
771 /* if we need to use another bounce buffer */
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700772 if (srclen && bounce_addr == 0) {
773 cur_dest_sgl = sg_next(cur_dest_sgl);
774 bounce_addr = (unsigned long)
775 kmap_atomic(
776 sg_page(cur_dest_sgl));
777 }
K. Y. Srinivasan8de58072015-03-27 00:27:18 -0700778
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800779 }
780
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700781 kunmap_atomic((void *)(src_addr - cur_src_sgl->offset));
782 cur_src_sgl = sg_next(cur_src_sgl);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800783 }
784
K. Y. Srinivasan8de58072015-03-27 00:27:18 -0700785 if (bounce_addr)
K. Y. Srinivasanaaced992015-03-27 00:27:19 -0700786 kunmap_atomic((void *)bounce_addr);
K. Y. Srinivasan8de58072015-03-27 00:27:18 -0700787
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800788 local_irq_restore(flags);
789
790 return total_copied;
791}
792
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700793static void handle_sc_creation(struct vmbus_channel *new_sc)
794{
795 struct hv_device *device = new_sc->primary_channel->device_obj;
796 struct storvsc_device *stor_device;
797 struct vmstorage_channel_properties props;
798
799 stor_device = get_out_stor_device(device);
800 if (!stor_device)
801 return;
802
803 if (stor_device->open_sub_channel == false)
804 return;
805
806 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
807
808 vmbus_open(new_sc,
809 storvsc_ringbuffer_size,
810 storvsc_ringbuffer_size,
811 (void *)&props,
812 sizeof(struct vmstorage_channel_properties),
813 storvsc_on_channel_callback, new_sc);
814}
815
816static void handle_multichannel_storage(struct hv_device *device, int max_chns)
817{
818 struct storvsc_device *stor_device;
819 int num_cpus = num_online_cpus();
820 int num_sc;
821 struct storvsc_cmd_request *request;
822 struct vstor_packet *vstor_packet;
823 int ret, t;
824
825 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
826 stor_device = get_out_stor_device(device);
827 if (!stor_device)
828 return;
829
830 request = &stor_device->init_request;
831 vstor_packet = &request->vstor_packet;
832
833 stor_device->open_sub_channel = true;
834 /*
835 * Establish a handler for dealing with subchannels.
836 */
837 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
838
839 /*
840 * Check to see if sub-channels have already been created. This
841 * can happen when this driver is re-loaded after unloading.
842 */
843
844 if (vmbus_are_subchannels_present(device->channel))
845 return;
846
847 stor_device->open_sub_channel = false;
848 /*
849 * Request the host to create sub-channels.
850 */
851 memset(request, 0, sizeof(struct storvsc_cmd_request));
852 init_completion(&request->wait_event);
853 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;
854 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
855 vstor_packet->sub_channel_count = num_sc;
856
857 ret = vmbus_sendpacket(device->channel, vstor_packet,
858 (sizeof(struct vstor_packet) -
859 vmscsi_size_delta),
860 (unsigned long)request,
861 VM_PKT_DATA_INBAND,
862 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
863
864 if (ret != 0)
865 return;
866
867 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
868 if (t == 0)
869 return;
870
871 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
872 vstor_packet->status != 0)
873 return;
874
875 /*
876 * Now that we created the sub-channels, invoke the check; this
877 * may trigger the callback.
878 */
879 stor_device->open_sub_channel = true;
880 vmbus_are_subchannels_present(device->channel);
881}
882
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700883static int storvsc_channel_init(struct hv_device *device)
884{
885 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800886 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700887 struct vstor_packet *vstor_packet;
888 int ret, t;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700889 int max_chns;
890 bool process_sub_channels = false;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700891
892 stor_device = get_out_stor_device(device);
893 if (!stor_device)
894 return -ENODEV;
895
896 request = &stor_device->init_request;
897 vstor_packet = &request->vstor_packet;
898
899 /*
900 * Now, initiate the vsc/vsp initialization protocol on the open
901 * channel
902 */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800903 memset(request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700904 init_completion(&request->wait_event);
905 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
906 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
907
908 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700909 (sizeof(struct vstor_packet) -
910 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700911 (unsigned long)request,
912 VM_PKT_DATA_INBAND,
913 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
914 if (ret != 0)
915 goto cleanup;
916
917 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
918 if (t == 0) {
919 ret = -ETIMEDOUT;
920 goto cleanup;
921 }
922
923 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
924 vstor_packet->status != 0)
925 goto cleanup;
926
927
928 /* reuse the packet for version range supported */
929 memset(vstor_packet, 0, sizeof(struct vstor_packet));
930 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
931 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
932
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800933 vstor_packet->version.major_minor =
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700934 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800935
936 /*
937 * The revision number is only used in Windows; set it to 0.
938 */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800939 vstor_packet->version.revision = 0;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700940
941 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700942 (sizeof(struct vstor_packet) -
943 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700944 (unsigned long)request,
945 VM_PKT_DATA_INBAND,
946 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
947 if (ret != 0)
948 goto cleanup;
949
950 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
951 if (t == 0) {
952 ret = -ETIMEDOUT;
953 goto cleanup;
954 }
955
956 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
957 vstor_packet->status != 0)
958 goto cleanup;
959
960
961 memset(vstor_packet, 0, sizeof(struct vstor_packet));
962 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
963 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700964
965 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700966 (sizeof(struct vstor_packet) -
967 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700968 (unsigned long)request,
969 VM_PKT_DATA_INBAND,
970 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
971
972 if (ret != 0)
973 goto cleanup;
974
975 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
976 if (t == 0) {
977 ret = -ETIMEDOUT;
978 goto cleanup;
979 }
980
981 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
982 vstor_packet->status != 0)
983 goto cleanup;
984
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700985 /*
986 * Check to see if multi-channel support is there.
987 * Hosts that implement protocol version of 5.1 and above
988 * support multi-channel.
989 */
990 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
991 if ((vmbus_proto_version != VERSION_WIN7) &&
992 (vmbus_proto_version != VERSION_WS2008)) {
993 if (vstor_packet->storage_channel_properties.flags &
994 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
995 process_sub_channels = true;
996 }
K. Y. Srinivasan5117b932015-03-27 00:27:17 -0700997 stor_device->max_transfer_bytes =
998 vstor_packet->storage_channel_properties.max_transfer_bytes;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -0700999
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001000 memset(vstor_packet, 0, sizeof(struct vstor_packet));
1001 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
1002 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1003
1004 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001005 (sizeof(struct vstor_packet) -
1006 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001007 (unsigned long)request,
1008 VM_PKT_DATA_INBAND,
1009 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1010
1011 if (ret != 0)
1012 goto cleanup;
1013
1014 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
1015 if (t == 0) {
1016 ret = -ETIMEDOUT;
1017 goto cleanup;
1018 }
1019
1020 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
1021 vstor_packet->status != 0)
1022 goto cleanup;
1023
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001024 if (process_sub_channels)
1025 handle_multichannel_storage(device, max_chns);
1026
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001027
1028cleanup:
1029 return ret;
1030}
1031
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001032static void storvsc_handle_error(struct vmscsi_request *vm_srb,
1033 struct scsi_cmnd *scmnd,
1034 struct Scsi_Host *host,
1035 u8 asc, u8 ascq)
1036{
1037 struct storvsc_scan_work *wrk;
1038 void (*process_err_fn)(struct work_struct *work);
1039 bool do_work = false;
1040
1041 switch (vm_srb->srb_status) {
1042 case SRB_STATUS_ERROR:
1043 /*
1044 * If there is an error; offline the device since all
1045 * error recovery strategies would have already been
1046 * deployed on the host side. However, if the command
1047 * were a pass-through command deal with it appropriately.
1048 */
1049 switch (scmnd->cmnd[0]) {
1050 case ATA_16:
1051 case ATA_12:
1052 set_host_byte(scmnd, DID_PASSTHROUGH);
1053 break;
K. Y. Srinivasan3533f8602014-07-12 09:48:32 -07001054 /*
1055 * On Some Windows hosts TEST_UNIT_READY command can return
1056 * SRB_STATUS_ERROR, let the upper level code deal with it
1057 * based on the sense information.
1058 */
1059 case TEST_UNIT_READY:
1060 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001061 default:
1062 set_host_byte(scmnd, DID_TARGET_FAILURE);
1063 }
1064 break;
1065 case SRB_STATUS_INVALID_LUN:
1066 do_work = true;
1067 process_err_fn = storvsc_remove_lun;
1068 break;
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001069 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
1070 if ((asc == 0x2a) && (ascq == 0x9)) {
1071 do_work = true;
1072 process_err_fn = storvsc_device_scan;
1073 /*
1074 * Retry the I/O that trigerred this.
1075 */
1076 set_host_byte(scmnd, DID_REQUEUE);
1077 }
1078 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001079 }
K. Y. Srinivasan67812092013-02-21 12:04:53 -08001080
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001081 if (!do_work)
1082 return;
1083
1084 /*
1085 * We need to schedule work to process this error; schedule it.
1086 */
1087 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1088 if (!wrk) {
1089 set_host_byte(scmnd, DID_TARGET_FAILURE);
1090 return;
1091 }
1092
1093 wrk->host = host;
1094 wrk->lun = vm_srb->lun;
1095 INIT_WORK(&wrk->work, process_err_fn);
1096 schedule_work(&wrk->work);
1097}
1098
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001099
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001100static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001101{
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001102 struct scsi_cmnd *scmnd = cmd_request->cmd;
1103 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001104 struct scsi_sense_hdr sense_hdr;
1105 struct vmscsi_request *vm_srb;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001106 struct Scsi_Host *host;
1107 struct storvsc_device *stor_dev;
1108 struct hv_device *dev = host_dev->dev;
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001109 u32 payload_sz = cmd_request->payload_sz;
1110 void *payload = cmd_request->payload;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001111
1112 stor_dev = get_in_stor_device(dev);
1113 host = stor_dev->host;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001114
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001115 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001116 if (cmd_request->bounce_sgl_count) {
1117 if (vm_srb->data_in == READ_TYPE)
1118 copy_from_bounce_buffer(scsi_sglist(scmnd),
1119 cmd_request->bounce_sgl,
1120 scsi_sg_count(scmnd),
1121 cmd_request->bounce_sgl_count);
1122 destroy_bounce_buffer(cmd_request->bounce_sgl,
1123 cmd_request->bounce_sgl_count);
1124 }
1125
K. Y. Srinivasan42e22ca2012-04-05 12:26:52 -07001126 scmnd->result = vm_srb->scsi_status;
1127
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001128 if (scmnd->result) {
1129 if (scsi_normalize_sense(scmnd->sense_buffer,
1130 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
Hannes Reinecked811b842014-10-24 14:26:45 +02001131 scsi_print_sense_hdr(scmnd->device, "storvsc",
1132 &sense_hdr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001133 }
1134
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -08001135 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
1136 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
1137 sense_hdr.ascq);
1138
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001139 scsi_set_resid(scmnd,
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001140 cmd_request->payload->range.len -
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001141 vm_srb->data_transfer_length);
1142
Christoph Hellwigead37002014-12-29 20:05:09 -08001143 scmnd->scsi_done(scmnd);
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001144
1145 if (payload_sz >
1146 sizeof(struct vmbus_channel_packet_multipage_buffer))
1147 kfree(payload);
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001148}
1149
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001150static void storvsc_on_io_completion(struct hv_device *device,
1151 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001152 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001153{
1154 struct storvsc_device *stor_device;
1155 struct vstor_packet *stor_pkt;
1156
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001157 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001158 stor_pkt = &request->vstor_packet;
1159
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001160 /*
1161 * The current SCSI handling on the host side does
1162 * not correctly handle:
1163 * INQUIRY command with page code parameter set to 0x80
1164 * MODE_SENSE command with cmd[2] == 0x1c
1165 *
1166 * Setup srb and scsi status so this won't be fatal.
1167 * We do this so we can distinguish truly fatal failues
1168 * (srb status == 0x4) and off-line the device in that case.
1169 */
1170
1171 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -08001172 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001173 vstor_packet->vm_srb.scsi_status = 0;
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001174 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001175 }
1176
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001177
1178 /* Copy over the status...etc */
1179 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1180 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1181 stor_pkt->vm_srb.sense_info_length =
1182 vstor_packet->vm_srb.sense_info_length;
1183
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001184
1185 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1186 /* CHECK_CONDITION */
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001187 if (vstor_packet->vm_srb.srb_status &
1188 SRB_STATUS_AUTOSENSE_VALID) {
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001189 /* autosense data available */
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001190
Christoph Hellwigead37002014-12-29 20:05:09 -08001191 memcpy(request->cmd->sense_buffer,
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001192 vstor_packet->vm_srb.sense_data,
1193 vstor_packet->vm_srb.sense_info_length);
1194
1195 }
1196 }
1197
1198 stor_pkt->vm_srb.data_transfer_length =
1199 vstor_packet->vm_srb.data_transfer_length;
1200
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001201 storvsc_command_completion(request);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001202
1203 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1204 stor_device->drain_notify)
1205 wake_up(&stor_device->waiting_to_drain);
1206
1207
1208}
1209
1210static void storvsc_on_receive(struct hv_device *device,
1211 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001212 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001213{
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001214 struct storvsc_scan_work *work;
1215 struct storvsc_device *stor_device;
1216
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001217 switch (vstor_packet->operation) {
1218 case VSTOR_OPERATION_COMPLETE_IO:
1219 storvsc_on_io_completion(device, vstor_packet, request);
1220 break;
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001221
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001222 case VSTOR_OPERATION_REMOVE_DEVICE:
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001223 case VSTOR_OPERATION_ENUMERATE_BUS:
1224 stor_device = get_in_stor_device(device);
1225 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1226 if (!work)
1227 return;
1228
K. Y. Srinivasan2a09ed32014-12-16 13:21:42 -08001229 INIT_WORK(&work->work, storvsc_host_scan);
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001230 work->host = stor_device->host;
1231 schedule_work(&work->work);
1232 break;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001233
1234 default:
1235 break;
1236 }
1237}
1238
1239static void storvsc_on_channel_callback(void *context)
1240{
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001241 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1242 struct hv_device *device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001243 struct storvsc_device *stor_device;
1244 u32 bytes_recvd;
1245 u64 request_id;
1246 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001247 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001248 int ret;
1249
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001250 if (channel->primary_channel != NULL)
1251 device = channel->primary_channel->device_obj;
1252 else
1253 device = channel->device_obj;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001254
1255 stor_device = get_in_stor_device(device);
1256 if (!stor_device)
1257 return;
1258
1259 do {
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001260 ret = vmbus_recvpacket(channel, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001261 ALIGN((sizeof(struct vstor_packet) -
1262 vmscsi_size_delta), 8),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001263 &bytes_recvd, &request_id);
1264 if (ret == 0 && bytes_recvd > 0) {
1265
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001266 request = (struct storvsc_cmd_request *)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001267 (unsigned long)request_id;
1268
1269 if ((request == &stor_device->init_request) ||
1270 (request == &stor_device->reset_request)) {
1271
1272 memcpy(&request->vstor_packet, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001273 (sizeof(struct vstor_packet) -
1274 vmscsi_size_delta));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001275 complete(&request->wait_event);
1276 } else {
1277 storvsc_on_receive(device,
1278 (struct vstor_packet *)packet,
1279 request);
1280 }
1281 } else {
1282 break;
1283 }
1284 } while (1);
1285
1286 return;
1287}
1288
1289static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1290{
1291 struct vmstorage_channel_properties props;
1292 int ret;
1293
1294 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1295
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001296 ret = vmbus_open(device->channel,
1297 ring_size,
1298 ring_size,
1299 (void *)&props,
1300 sizeof(struct vmstorage_channel_properties),
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001301 storvsc_on_channel_callback, device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001302
1303 if (ret != 0)
1304 return ret;
1305
1306 ret = storvsc_channel_init(device);
1307
1308 return ret;
1309}
1310
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001311static int storvsc_dev_remove(struct hv_device *device)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001312{
1313 struct storvsc_device *stor_device;
1314 unsigned long flags;
1315
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001316 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001317
1318 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1319 stor_device->destroy = true;
1320 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1321
1322 /*
1323 * At this point, all outbound traffic should be disable. We
1324 * only allow inbound traffic (responses) to proceed so that
1325 * outstanding requests can be completed.
1326 */
1327
1328 storvsc_wait_to_drain(stor_device);
1329
1330 /*
1331 * Since we have already drained, we don't need to busy wait
1332 * as was done in final_release_stor_device()
1333 * Note that we cannot set the ext pointer to NULL until
1334 * we have drained - to drain the outgoing packets, we need to
1335 * allow incoming packets.
1336 */
1337 spin_lock_irqsave(&device->channel->inbound_lock, flags);
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001338 hv_set_drvdata(device, NULL);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001339 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1340
1341 /* Close the channel */
1342 vmbus_close(device->channel);
1343
1344 kfree(stor_device);
1345 return 0;
1346}
1347
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001348static int storvsc_do_io(struct hv_device *device,
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001349 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001350{
1351 struct storvsc_device *stor_device;
1352 struct vstor_packet *vstor_packet;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001353 struct vmbus_channel *outgoing_channel;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001354 int ret = 0;
1355
1356 vstor_packet = &request->vstor_packet;
1357 stor_device = get_out_stor_device(device);
1358
1359 if (!stor_device)
1360 return -ENODEV;
1361
1362
1363 request->device = device;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001364 /*
1365 * Select an an appropriate channel to send the request out.
1366 */
1367
1368 outgoing_channel = vmbus_get_outgoing_channel(device->channel);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001369
1370
1371 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1372
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001373 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1374 vmscsi_size_delta);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001375
1376
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001377 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001378
1379
1380 vstor_packet->vm_srb.data_transfer_length =
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001381 request->payload->range.len;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001382
1383 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1384
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001385 if (request->payload->range.len) {
1386
1387 ret = vmbus_sendpacket_mpb_desc(outgoing_channel,
1388 request->payload, request->payload_sz,
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001389 vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001390 (sizeof(struct vstor_packet) -
1391 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001392 (unsigned long)request);
1393 } else {
K. Y. Srinivasan0147dab2015-03-27 00:27:16 -07001394 ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001395 (sizeof(struct vstor_packet) -
1396 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001397 (unsigned long)request,
1398 VM_PKT_DATA_INBAND,
1399 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1400 }
1401
1402 if (ret != 0)
1403 return ret;
1404
1405 atomic_inc(&stor_device->num_outstanding_req);
1406
1407 return ret;
1408}
1409
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001410static int storvsc_device_configure(struct scsi_device *sdevice)
1411{
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001412
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001413 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1414
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001415 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001416
K. Y. Srinivasan893def32013-06-04 12:05:05 -07001417 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1418
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001419 sdevice->no_write_same = 1;
1420
K. Y. Srinivasanf3cfabc2014-07-21 16:06:01 -07001421 /*
1422 * Add blist flags to permit the reading of the VPD pages even when
1423 * the target may claim SPC-2 compliance. MSFT targets currently
1424 * claim SPC-2 compliance while they implement post SPC-2 features.
1425 * With this patch we can correctly handle WRITE_SAME_16 issues.
1426 */
1427 sdevice->sdev_bflags |= msft_blist_flags;
1428
K. Y. Srinivasanb0a93d92014-12-16 13:21:45 -08001429 /*
1430 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
1431 * if the device is a MSFT virtual device.
1432 */
1433 if (!strncmp(sdevice->vendor, "Msft", 4)) {
1434 switch (vmbus_proto_version) {
1435 case VERSION_WIN8:
1436 case VERSION_WIN8_1:
1437 sdevice->scsi_level = SCSI_SPC_3;
1438 break;
1439 }
1440 }
1441
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001442 return 0;
1443}
1444
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001445static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1446 sector_t capacity, int *info)
1447{
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001448 sector_t nsect = capacity;
1449 sector_t cylinders = nsect;
1450 int heads, sectors_pt;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001451
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001452 /*
1453 * We are making up these values; let us keep it simple.
1454 */
1455 heads = 0xff;
1456 sectors_pt = 0x3f; /* Sectors per track */
1457 sector_div(cylinders, heads * sectors_pt);
1458 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1459 cylinders = 0xffff;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001460
1461 info[0] = heads;
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001462 info[1] = sectors_pt;
1463 info[2] = (int)cylinders;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001464
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001465 return 0;
1466}
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001467
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001468static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001469{
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001470 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1471 struct hv_device *device = host_dev->dev;
1472
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001473 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001474 struct storvsc_cmd_request *request;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001475 struct vstor_packet *vstor_packet;
1476 int ret, t;
1477
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001478
K. Y. Srinivasan1eaaddf2011-08-27 11:31:03 -07001479 stor_device = get_out_stor_device(device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001480 if (!stor_device)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001481 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001482
1483 request = &stor_device->reset_request;
1484 vstor_packet = &request->vstor_packet;
1485
1486 init_completion(&request->wait_event);
1487
1488 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1489 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1490 vstor_packet->vm_srb.path_id = stor_device->path_id;
1491
1492 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001493 (sizeof(struct vstor_packet) -
1494 vmscsi_size_delta),
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001495 (unsigned long)&stor_device->reset_request,
1496 VM_PKT_DATA_INBAND,
1497 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1498 if (ret != 0)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001499 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001500
K. Y. Srinivasan46d2eb62011-06-16 13:16:36 -07001501 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001502 if (t == 0)
1503 return TIMEOUT_ERROR;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001504
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001505
1506 /*
1507 * At this point, all outstanding requests in the adapter
1508 * should have been flushed out and return to us
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001509 * There is a potential race here where the host may be in
1510 * the process of responding when we return from here.
1511 * Just wait for all in-transit packets to be accounted for
1512 * before we return from here.
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001513 */
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001514 storvsc_wait_to_drain(stor_device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001515
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001516 return SUCCESS;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001517}
1518
K. Y. Srinivasan56b26e62014-07-12 09:48:30 -07001519/*
1520 * The host guarantees to respond to each command, although I/O latencies might
1521 * be unbounded on Azure. Reset the timer unconditionally to give the host a
1522 * chance to perform EH.
1523 */
1524static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
1525{
1526 return BLK_EH_RESET_TIMER;
1527}
1528
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001529static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001530{
1531 bool allowed = true;
1532 u8 scsi_op = scmnd->cmnd[0];
1533
1534 switch (scsi_op) {
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001535 /* the host does not handle WRITE_SAME, log accident usage */
1536 case WRITE_SAME:
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001537 /*
1538 * smartd sends this command and the host does not handle
1539 * this. So, don't send it.
1540 */
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001541 case SET_WINDOW:
K. Y. Srinivasan59e00e72011-11-08 09:01:42 -08001542 scmnd->result = ILLEGAL_REQUEST << 16;
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001543 allowed = false;
1544 break;
1545 default:
1546 break;
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001547 }
1548 return allowed;
1549}
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001550
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001551static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001552{
1553 int ret;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001554 struct hv_host_device *host_dev = shost_priv(host);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001555 struct hv_device *dev = host_dev->dev;
Christoph Hellwigead37002014-12-29 20:05:09 -08001556 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001557 int i;
1558 struct scatterlist *sgl;
1559 unsigned int sg_count = 0;
1560 struct vmscsi_request *vm_srb;
K. Y. Srinivasanaaced992015-03-27 00:27:19 -07001561 struct scatterlist *cur_sgl;
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001562 struct vmbus_packet_mpb_array *payload;
1563 u32 payload_sz;
1564 u32 length;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001565
K. Y. Srinivasan8caf92d2014-07-12 09:48:28 -07001566 if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
1567 /*
1568 * On legacy hosts filter unimplemented commands.
1569 * Future hosts are expected to correctly handle
1570 * unsupported commands. Furthermore, it is
1571 * possible that some of the currently
1572 * unsupported commands maybe supported in
1573 * future versions of the host.
1574 */
1575 if (!storvsc_scsi_cmd_ok(scmnd)) {
1576 scmnd->scsi_done(scmnd);
1577 return 0;
1578 }
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001579 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001580
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001581 /* Setup the cmd request */
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001582 cmd_request->cmd = scmnd;
1583
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001584 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001585 vm_srb->win8_extension.time_out_value = 60;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001586
K. Y. Srinivasanf885fb72014-07-12 09:48:31 -07001587 vm_srb->win8_extension.srb_flags |=
1588 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1589 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001590
1591 /* Build the SRB */
1592 switch (scmnd->sc_data_direction) {
1593 case DMA_TO_DEVICE:
1594 vm_srb->data_in = WRITE_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001595 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001596 break;
1597 case DMA_FROM_DEVICE:
1598 vm_srb->data_in = READ_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001599 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001600 break;
1601 default:
1602 vm_srb->data_in = UNKNOWN_TYPE;
K. Y. Srinivasanf885fb72014-07-12 09:48:31 -07001603 vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN |
1604 SRB_FLAGS_DATA_OUT);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001605 break;
1606 }
1607
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001608
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001609 vm_srb->port_number = host_dev->port;
1610 vm_srb->path_id = scmnd->device->channel;
1611 vm_srb->target_id = scmnd->device->id;
1612 vm_srb->lun = scmnd->device->lun;
1613
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001614 vm_srb->cdb_length = scmnd->cmd_len;
1615
1616 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1617
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001618 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1619 sg_count = scsi_sg_count(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001620
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001621 length = scsi_bufflen(scmnd);
1622 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
1623 payload_sz = sizeof(cmd_request->mpb);
1624
1625 if (sg_count) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001626 /* check if we need to bounce the sgl */
1627 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1628 cmd_request->bounce_sgl =
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001629 create_bounce_buffer(sgl, sg_count,
1630 length,
K. Y. Srinivasan6e8087a2011-12-07 07:15:52 -08001631 vm_srb->data_in);
Christoph Hellwigead37002014-12-29 20:05:09 -08001632 if (!cmd_request->bounce_sgl)
1633 return SCSI_MLQUEUE_HOST_BUSY;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001634
1635 cmd_request->bounce_sgl_count =
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001636 ALIGN(length, PAGE_SIZE) >> PAGE_SHIFT;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001637
K. Y. Srinivasanfa23b8c2011-08-27 11:31:21 -07001638 if (vm_srb->data_in == WRITE_TYPE)
1639 copy_to_bounce_buffer(sgl,
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001640 cmd_request->bounce_sgl, sg_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001641
1642 sgl = cmd_request->bounce_sgl;
1643 sg_count = cmd_request->bounce_sgl_count;
1644 }
1645
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001646
1647 if (sg_count > MAX_PAGE_BUFFER_COUNT) {
1648
1649 payload_sz = (sg_count * sizeof(void *) +
1650 sizeof(struct vmbus_packet_mpb_array));
1651 payload = kmalloc(payload_sz, GFP_ATOMIC);
1652 if (!payload) {
1653 if (cmd_request->bounce_sgl_count)
1654 destroy_bounce_buffer(
1655 cmd_request->bounce_sgl,
1656 cmd_request->bounce_sgl_count);
1657
1658 return SCSI_MLQUEUE_DEVICE_BUSY;
1659 }
1660 }
1661
1662 payload->range.len = length;
1663 payload->range.offset = sgl[0].offset;
1664
K. Y. Srinivasanaaced992015-03-27 00:27:19 -07001665 cur_sgl = sgl;
1666 for (i = 0; i < sg_count; i++) {
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001667 payload->range.pfn_array[i] =
K. Y. Srinivasanaaced992015-03-27 00:27:19 -07001668 page_to_pfn(sg_page((cur_sgl)));
1669 cur_sgl = sg_next(cur_sgl);
1670 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001671
1672 } else if (scsi_sglist(scmnd)) {
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001673 payload->range.len = length;
1674 payload->range.offset =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001675 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001676 payload->range.pfn_array[0] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001677 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1678 }
1679
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001680 cmd_request->payload = payload;
1681 cmd_request->payload_sz = payload_sz;
1682
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001683 /* Invokes the vsc to start an IO */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001684 ret = storvsc_do_io(dev, cmd_request);
K. Y. Srinivasan636f0fd2011-05-10 07:54:50 -07001685
K. Y. Srinivasand2598f02011-08-25 09:48:58 -07001686 if (ret == -EAGAIN) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001687 /* no more space */
1688
Long Lie86fb5e82014-12-05 19:38:18 -08001689 if (cmd_request->bounce_sgl_count)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001690 destroy_bounce_buffer(cmd_request->bounce_sgl,
K. Y. Srinivasan70691ec2011-08-27 11:31:29 -07001691 cmd_request->bounce_sgl_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001692
Christoph Hellwigead37002014-12-29 20:05:09 -08001693 return SCSI_MLQUEUE_DEVICE_BUSY;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001694 }
1695
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001696 return 0;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001697}
1698
Hank Janssenbef4a342009-07-13 16:01:31 -07001699static struct scsi_host_template scsi_driver = {
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001700 .module = THIS_MODULE,
1701 .name = "storvsc_host_t",
Christoph Hellwigead37002014-12-29 20:05:09 -08001702 .cmd_size = sizeof(struct storvsc_cmd_request),
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001703 .bios_param = storvsc_get_chs,
1704 .queuecommand = storvsc_queuecommand,
1705 .eh_host_reset_handler = storvsc_host_reset_handler,
Christoph Hellwigead37002014-12-29 20:05:09 -08001706 .proc_name = "storvsc_host",
K. Y. Srinivasan56b26e62014-07-12 09:48:30 -07001707 .eh_timed_out = storvsc_eh_timed_out,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001708 .slave_configure = storvsc_device_configure,
K. Y. Srinivasan52f96142014-07-12 09:48:27 -07001709 .cmd_per_lun = 255,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001710 .this_id = -1,
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001711 .use_clustering = ENABLE_CLUSTERING,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001712 /* Make sure we dont get a sg segment crosses a page boundary */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001713 .dma_boundary = PAGE_SIZE-1,
Martin K. Petersen54b2b502013-10-23 06:25:40 -04001714 .no_write_same = 1,
Hank Janssenbef4a342009-07-13 16:01:31 -07001715};
1716
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001717enum {
1718 SCSI_GUID,
1719 IDE_GUID,
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001720 SFC_GUID,
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001721};
1722
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001723static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001724 /* SCSI guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001725 { HV_SCSI_GUID,
1726 .driver_data = SCSI_GUID
1727 },
K. Y. Srinivasan21e37742011-08-27 11:31:18 -07001728 /* IDE guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001729 { HV_IDE_GUID,
1730 .driver_data = IDE_GUID
1731 },
K. Y. Srinivasanbde6d0f2013-06-04 12:05:08 -07001732 /* Fibre Channel GUID */
1733 {
1734 HV_SYNTHFC_GUID,
1735 .driver_data = SFC_GUID
1736 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001737 { },
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001738};
Hank Janssenbef4a342009-07-13 16:01:31 -07001739
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001740MODULE_DEVICE_TABLE(vmbus, id_table);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001741
K. Y. Srinivasan84946892011-09-13 10:59:38 -07001742static int storvsc_probe(struct hv_device *device,
1743 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001744{
1745 int ret;
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -07001746 int num_cpus = num_online_cpus();
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001747 struct Scsi_Host *host;
1748 struct hv_host_device *host_dev;
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001749 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001750 int target = 0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001751 struct storvsc_device *stor_device;
K. Y. Srinivasan0fb8db22014-12-16 13:21:44 -08001752 int max_luns_per_target;
1753 int max_targets;
1754 int max_channels;
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -07001755 int max_sub_channels = 0;
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001756
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001757 /*
1758 * Based on the windows host we are running on,
1759 * set state to properly communicate with the host.
1760 */
1761
K. Y. Srinivasanadb6f9e2014-07-12 09:48:29 -07001762 switch (vmbus_proto_version) {
1763 case VERSION_WS2008:
1764 case VERSION_WIN7:
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001765 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1766 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1767 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1768 vmstor_current_minor = VMSTOR_WIN7_MINOR;
K. Y. Srinivasan0fb8db22014-12-16 13:21:44 -08001769 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1770 max_targets = STORVSC_IDE_MAX_TARGETS;
1771 max_channels = STORVSC_IDE_MAX_CHANNELS;
K. Y. Srinivasanadb6f9e2014-07-12 09:48:29 -07001772 break;
1773 default:
1774 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1775 vmscsi_size_delta = 0;
1776 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1777 vmstor_current_minor = VMSTOR_WIN8_MINOR;
K. Y. Srinivasan0fb8db22014-12-16 13:21:44 -08001778 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
1779 max_targets = STORVSC_MAX_TARGETS;
1780 max_channels = STORVSC_MAX_CHANNELS;
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -07001781 /*
1782 * On Windows8 and above, we support sub-channels for storage.
1783 * The number of sub-channels offerred is based on the number of
1784 * VCPUs in the guest.
1785 */
1786 max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
K. Y. Srinivasanadb6f9e2014-07-12 09:48:29 -07001787 break;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001788 }
1789
K. Y. Srinivasanf458aad2015-03-27 00:27:15 -07001790 scsi_driver.can_queue = (max_outstanding_req_per_channel *
1791 (max_sub_channels + 1));
1792
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001793 host = scsi_host_alloc(&scsi_driver,
1794 sizeof(struct hv_host_device));
1795 if (!host)
1796 return -ENOMEM;
1797
K. Y. Srinivasan7f33f302011-11-08 09:01:44 -08001798 host_dev = shost_priv(host);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001799 memset(host_dev, 0, sizeof(struct hv_host_device));
1800
1801 host_dev->port = host->host_no;
1802 host_dev->dev = device;
1803
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001804
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001805 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001806 if (!stor_device) {
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001807 ret = -ENOMEM;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001808 goto err_out0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001809 }
1810
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001811 stor_device->destroy = false;
K. Y. Srinivasan6f94d5d2013-06-04 12:05:07 -07001812 stor_device->open_sub_channel = false;
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001813 init_waitqueue_head(&stor_device->waiting_to_drain);
1814 stor_device->device = device;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001815 stor_device->host = host;
1816 hv_set_drvdata(device, stor_device);
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001817
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001818 stor_device->port_number = host->host_no;
1819 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001820 if (ret)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001821 goto err_out1;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001822
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001823 host_dev->path = stor_device->path_id;
1824 host_dev->target = stor_device->target_id;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001825
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -07001826 switch (dev_id->driver_data) {
1827 case SFC_GUID:
1828 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
1829 host->max_id = STORVSC_FC_MAX_TARGETS;
1830 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
1831 break;
1832
1833 case SCSI_GUID:
K. Y. Srinivasan0fb8db22014-12-16 13:21:44 -08001834 host->max_lun = max_luns_per_target;
1835 host->max_id = max_targets;
1836 host->max_channel = max_channels - 1;
K. Y. Srinivasan4cd83ec2014-07-12 09:48:26 -07001837 break;
1838
1839 default:
1840 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
1841 host->max_id = STORVSC_IDE_MAX_TARGETS;
1842 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
1843 break;
1844 }
Mike Sterlingcf55f4a2011-09-06 16:10:55 -07001845 /* max cmd length */
1846 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001847
K. Y. Srinivasanbe0cf6c2015-03-27 00:27:20 -07001848 /*
1849 * set the table size based on the info we got
1850 * from the host.
1851 */
1852 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
1853
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001854 /* Register the HBA and start the scsi bus scan */
1855 ret = scsi_add_host(host, &device->device);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001856 if (ret != 0)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001857 goto err_out2;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001858
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001859 if (!dev_is_ide) {
1860 scsi_scan_host(host);
K. Y. Srinivasan59d22952012-01-12 12:37:55 -08001861 } else {
1862 target = (device->dev_instance.b[5] << 8 |
1863 device->dev_instance.b[4]);
1864 ret = scsi_add_device(host, 0, target, 0);
1865 if (ret) {
1866 scsi_remove_host(host);
1867 goto err_out2;
1868 }
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001869 }
1870 return 0;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001871
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001872err_out2:
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001873 /*
1874 * Once we have connected with the host, we would need to
1875 * to invoke storvsc_dev_remove() to rollback this state and
1876 * this call also frees up the stor_device; hence the jump around
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001877 * err_out1 label.
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001878 */
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001879 storvsc_dev_remove(device);
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001880 goto err_out0;
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001881
1882err_out1:
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001883 kfree(stor_device);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001884
1885err_out0:
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001886 scsi_host_put(host);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001887 return ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001888}
1889
K. Y. Srinivasanddcbf652012-01-12 12:37:59 -08001890static int storvsc_remove(struct hv_device *dev)
1891{
1892 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1893 struct Scsi_Host *host = stor_device->host;
1894
1895 scsi_remove_host(host);
1896 storvsc_dev_remove(dev);
1897 scsi_host_put(host);
1898
1899 return 0;
1900}
1901
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001902static struct hv_driver storvsc_drv = {
K. Y. Srinivasanfafb0ef2011-11-08 09:01:46 -08001903 .name = KBUILD_MODNAME,
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001904 .id_table = id_table,
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001905 .probe = storvsc_probe,
1906 .remove = storvsc_remove,
K. Y. Srinivasan39ae6fa2011-05-10 07:54:46 -07001907};
K. Y. Srinivasan7bd05b92011-05-10 07:54:45 -07001908
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001909static int __init storvsc_drv_init(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001910{
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001911
1912 /*
1913 * Divide the ring buffer data size (which is 1 page less
1914 * than the ring buffer size since that page is reserved for
1915 * the ring buffer indices) by the max request size (which is
1916 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1917 */
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001918 max_outstanding_req_per_channel =
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001919 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1920 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001921 sizeof(struct vstor_packet) + sizeof(u64) -
1922 vmscsi_size_delta,
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001923 sizeof(u64)));
Hank Janssenbef4a342009-07-13 16:01:31 -07001924
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001925 return vmbus_driver_register(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001926}
1927
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001928static void __exit storvsc_drv_exit(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001929{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001930 vmbus_driver_unregister(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001931}
1932
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001933MODULE_LICENSE("GPL");
Stephen Hemminger3afc7cc32010-05-06 21:44:45 -07001934MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001935module_init(storvsc_drv_init);
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001936module_exit(storvsc_drv_exit);