blob: 945198910460a8ebcb0baa049bdd66cbe524b0c5 [file] [log] [blame]
Hank Janssenbef4a342009-07-13 16:01:31 -07001/*
Hank Janssenbef4a342009-07-13 16:01:31 -07002 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
K. Y. Srinivasan972621c2011-05-10 07:54:19 -070020 * K. Y. Srinivasan <kys@microsoft.com>
Hank Janssenbef4a342009-07-13 16:01:31 -070021 */
K. Y. Srinivasana1be1702011-08-27 11:31:23 -070022
23#include <linux/kernel.h>
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070024#include <linux/wait.h>
K. Y. Srinivasana1be1702011-08-27 11:31:23 -070025#include <linux/sched.h>
26#include <linux/completion.h>
27#include <linux/string.h>
28#include <linux/mm.h>
29#include <linux/delay.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070030#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070032#include <linux/module.h>
33#include <linux/device.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070034#include <linux/hyperv.h>
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -080035#include <linux/mempool.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070036#include <scsi/scsi.h>
37#include <scsi/scsi_cmnd.h>
38#include <scsi/scsi_host.h>
39#include <scsi/scsi_device.h>
40#include <scsi/scsi_tcq.h>
41#include <scsi/scsi_eh.h>
42#include <scsi/scsi_devinfo.h>
Hank Janssenbef4a342009-07-13 16:01:31 -070043#include <scsi/scsi_dbg.h>
K. Y. Srinivasan3f335ea2011-05-12 19:34:15 -070044
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080045/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -080046 * All wire protocol details (storage protocol between the guest and the host)
47 * are consolidated here.
48 *
49 * Begin protocol definitions.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080050 */
51
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080052/*
53 * Version history:
54 * V1 Beta: 0.1
55 * V1 RC < 2008/1/31: 1.0
56 * V1 RC > 2008/1/31: 2.0
57 * Win7: 4.2
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070058 * Win8: 5.1
K. Y. Srinivasan09f03552012-01-12 12:37:54 -080059 */
60
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070061
62#define VMSTOR_WIN7_MAJOR 4
63#define VMSTOR_WIN7_MINOR 2
64
65#define VMSTOR_WIN8_MAJOR 5
66#define VMSTOR_WIN8_MINOR 1
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070067
68
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070069/* Packet structure describing virtual storage requests. */
70enum vstor_packet_operation {
71 VSTOR_OPERATION_COMPLETE_IO = 1,
72 VSTOR_OPERATION_REMOVE_DEVICE = 2,
73 VSTOR_OPERATION_EXECUTE_SRB = 3,
74 VSTOR_OPERATION_RESET_LUN = 4,
75 VSTOR_OPERATION_RESET_ADAPTER = 5,
76 VSTOR_OPERATION_RESET_BUS = 6,
77 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
78 VSTOR_OPERATION_END_INITIALIZATION = 8,
79 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
80 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
K. Y. Srinivasan2b9525f2011-11-08 09:01:48 -080081 VSTOR_OPERATION_ENUMERATE_BUS = 11,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070082 VSTOR_OPERATION_FCHBA_DATA = 12,
83 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
84 VSTOR_OPERATION_MAXIMUM = 13
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070085};
86
87/*
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -070088 * WWN packet for Fibre Channel HBA
89 */
90
91struct hv_fc_wwn_packet {
92 bool primary_active;
93 u8 reserved1;
94 u8 reserved2;
95 u8 primary_port_wwn[8];
96 u8 primary_node_wwn[8];
97 u8 secondary_port_wwn[8];
98 u8 secondary_node_wwn[8];
99};
100
101
102
103/*
104 * SRB Flag Bits
105 */
106
107#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
108#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
109#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
110#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
111#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
112#define SRB_FLAGS_DATA_IN 0x00000040
113#define SRB_FLAGS_DATA_OUT 0x00000080
114#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
115#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
116#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
117#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
118#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
119
120/*
121 * This flag indicates the request is part of the workflow for processing a D3.
122 */
123#define SRB_FLAGS_D3_PROCESSING 0x00000800
124#define SRB_FLAGS_IS_ACTIVE 0x00010000
125#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
126#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
127#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
128#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
129#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
130#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
131#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
132#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
133#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
134
135
136/*
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700137 * Platform neutral description of a scsi request -
138 * this remains the same across the write regardless of 32/64 bit
139 * note: it's patterned off the SCSI_PASS_THROUGH structure
140 */
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800141#define STORVSC_MAX_CMD_LEN 0x10
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700142
143#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
144#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
145
146#define STORVSC_SENSE_BUFFER_SIZE 0x14
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800147#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700148
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700149/*
150 * Sense buffer size changed in win8; have a run-time
151 * variable to track the size we should use.
152 */
153static int sense_buffer_size;
154
155/*
156 * The size of the vmscsi_request has changed in win8. The
157 * additional size is because of new elements added to the
158 * structure. These elements are valid only when we are talking
159 * to a win8 host.
160 * Track the correction to size we need to apply.
161 */
162
163static int vmscsi_size_delta;
164static int vmstor_current_major;
165static int vmstor_current_minor;
166
167struct vmscsi_win8_extension {
168 /*
169 * The following were added in Windows 8
170 */
171 u16 reserve;
172 u8 queue_tag;
173 u8 queue_action;
174 u32 srb_flags;
175 u32 time_out_value;
176 u32 queue_sort_ey;
177} __packed;
178
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700179struct vmscsi_request {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800180 u16 length;
181 u8 srb_status;
182 u8 scsi_status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700183
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800184 u8 port_number;
185 u8 path_id;
186 u8 target_id;
187 u8 lun;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700188
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800189 u8 cdb_length;
190 u8 sense_info_length;
191 u8 data_in;
192 u8 reserved;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700193
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800194 u32 data_transfer_length;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700195
196 union {
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800197 u8 cdb[STORVSC_MAX_CMD_LEN];
198 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
199 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700200 };
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700201 /*
202 * The following was added in win8.
203 */
204 struct vmscsi_win8_extension win8_extension;
205
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700206} __attribute((packed));
207
208
209/*
210 * This structure is sent during the intialization phase to get the different
211 * properties of the channel.
212 */
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700213
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700214#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
215
216struct vmstorage_channel_properties {
217 u32 reserved;
218 u16 max_channel_cnt;
219 u16 reserved1;
220
221 u32 flags;
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800222 u32 max_transfer_bytes;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700223
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700224 u64 reserved2;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700225} __packed;
226
227/* This structure is sent during the storage protocol negotiations. */
228struct vmstorage_protocol_version {
229 /* Major (MSW) and minor (LSW) version numbers. */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800230 u16 major_minor;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700231
232 /*
233 * Revision number is auto-incremented whenever this file is changed
234 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
235 * definitely indicate incompatibility--but it does indicate mismatched
236 * builds.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800237 * This is only used on the windows side. Just set it to 0.
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700238 */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800239 u16 revision;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700240} __packed;
241
242/* Channel Property Flags */
243#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
244#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
245
246struct vstor_packet {
247 /* Requested operation type */
248 enum vstor_packet_operation operation;
249
250 /* Flags - see below for values */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800251 u32 flags;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700252
253 /* Status of the request returned from the server side. */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800254 u32 status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700255
256 /* Data payload area */
257 union {
258 /*
259 * Structure used to forward SCSI commands from the
260 * client to the server.
261 */
262 struct vmscsi_request vm_srb;
263
264 /* Structure used to query channel properties. */
265 struct vmstorage_channel_properties storage_channel_properties;
266
267 /* Used during version negotiations. */
268 struct vmstorage_protocol_version version;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700269
270 /* Fibre channel address packet */
271 struct hv_fc_wwn_packet wwn_packet;
272
273 /* Number of sub-channels to create */
274 u16 sub_channel_count;
275
276 /* This will be the maximum of the union members */
277 u8 buffer[0x34];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700278 };
279} __packed;
280
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700281/*
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800282 * Packet Flags:
283 *
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700284 * This flag indicates that the server should send back a completion for this
285 * packet.
286 */
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800287
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700288#define REQUEST_COMPLETION_FLAG 0x1
289
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700290/* Matches Windows-end */
291enum storvsc_request_type {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800292 WRITE_TYPE = 0,
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700293 READ_TYPE,
294 UNKNOWN_TYPE,
295};
296
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800297/*
298 * SRB status codes and masks; a subset of the codes used here.
299 */
300
301#define SRB_STATUS_AUTOSENSE_VALID 0x80
302#define SRB_STATUS_INVALID_LUN 0x20
303#define SRB_STATUS_SUCCESS 0x01
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800304#define SRB_STATUS_ABORTED 0x02
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800305#define SRB_STATUS_ERROR 0x04
306
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800307/*
308 * This is the end of Protocol specific defines.
309 */
310
311
312/*
313 * We setup a mempool to allocate request structures for this driver
314 * on a per-lun basis. The following define specifies the number of
315 * elements in the pool.
316 */
317
318#define STORVSC_MIN_BUF_NR 64
319static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
320
321module_param(storvsc_ringbuffer_size, int, S_IRUGO);
322MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
323
K. Y. Srinivasan893def32013-06-04 12:05:05 -0700324/*
325 * Timeout in seconds for all devices managed by this driver.
326 */
327static int storvsc_timeout = 180;
328
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800329#define STORVSC_MAX_IO_REQUESTS 128
330
331/*
332 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
333 * reality, the path/target is not used (ie always set to 0) so our
334 * scsi host adapter essentially has 1 bus with 1 target that contains
335 * up to 256 luns.
336 */
337#define STORVSC_MAX_LUNS_PER_TARGET 64
338#define STORVSC_MAX_TARGETS 1
339#define STORVSC_MAX_CHANNELS 1
340
341
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800342
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800343struct storvsc_cmd_request {
344 struct list_head entry;
345 struct scsi_cmnd *cmd;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700346
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800347 unsigned int bounce_sgl_count;
348 struct scatterlist *bounce_sgl;
349
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700350 struct hv_device *device;
351
352 /* Synchronize the request/response if needed */
353 struct completion wait_event;
354
355 unsigned char *sense_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700356 struct hv_multipage_buffer data_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700357 struct vstor_packet vstor_packet;
358};
359
360
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700361/* A storvsc device is a device object that contains a vmbus channel */
362struct storvsc_device {
363 struct hv_device *device;
364
365 bool destroy;
366 bool drain_notify;
367 atomic_t num_outstanding_req;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700368 struct Scsi_Host *host;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700369
370 wait_queue_head_t waiting_to_drain;
371
372 /*
373 * Each unique Port/Path/Target represents 1 channel ie scsi
374 * controller. In reality, the pathid, targetid is always 0
375 * and the port is set by us
376 */
377 unsigned int port_number;
378 unsigned char path_id;
379 unsigned char target_id;
380
381 /* Used for vsc/vsp channel reset process */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800382 struct storvsc_cmd_request init_request;
383 struct storvsc_cmd_request reset_request;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700384};
385
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800386struct stor_mem_pools {
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700387 struct kmem_cache *request_pool;
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -0800388 mempool_t *request_mempool;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800389};
390
391struct hv_host_device {
392 struct hv_device *dev;
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700393 unsigned int port;
394 unsigned char path;
395 unsigned char target;
396};
397
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800398struct storvsc_scan_work {
399 struct work_struct work;
400 struct Scsi_Host *host;
401 uint lun;
402};
403
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800404static void storvsc_device_scan(struct work_struct *work)
405{
406 struct storvsc_scan_work *wrk;
407 uint lun;
408 struct scsi_device *sdev;
409
410 wrk = container_of(work, struct storvsc_scan_work, work);
411 lun = wrk->lun;
412
413 sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
414 if (!sdev)
415 goto done;
416 scsi_rescan_device(&sdev->sdev_gendev);
417 scsi_device_put(sdev);
418
419done:
420 kfree(wrk);
421}
422
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800423static void storvsc_bus_scan(struct work_struct *work)
424{
425 struct storvsc_scan_work *wrk;
426 int id, order_id;
427
428 wrk = container_of(work, struct storvsc_scan_work, work);
429 for (id = 0; id < wrk->host->max_id; ++id) {
430 if (wrk->host->reverse_ordering)
431 order_id = wrk->host->max_id - id - 1;
432 else
433 order_id = id;
434
435 scsi_scan_target(&wrk->host->shost_gendev, 0,
436 order_id, SCAN_WILD_CARD, 1);
437 }
438 kfree(wrk);
439}
440
K. Y. Srinivasanb4017312011-11-08 09:01:50 -0800441static void storvsc_remove_lun(struct work_struct *work)
442{
443 struct storvsc_scan_work *wrk;
444 struct scsi_device *sdev;
445
446 wrk = container_of(work, struct storvsc_scan_work, work);
447 if (!scsi_host_get(wrk->host))
448 goto done;
449
450 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
451
452 if (sdev) {
453 scsi_remove_device(sdev);
454 scsi_device_put(sdev);
455 }
456 scsi_host_put(wrk->host);
457
458done:
459 kfree(wrk);
460}
461
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800462/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800463 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
464 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
465 */
466
467static inline u16 storvsc_get_version(u8 major, u8 minor)
468{
469 u16 version;
470
471 version = ((major << 8) | minor);
472 return version;
473}
474
475/*
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800476 * We can get incoming messages from the host that are not in response to
477 * messages that we have sent out. An example of this would be messages
478 * received by the guest to notify dynamic addition/removal of LUNs. To
479 * deal with potential race conditions where the driver may be in the
480 * midst of being unloaded when we might receive an unsolicited message
481 * from the host, we have implemented a mechanism to gurantee sequential
482 * consistency:
483 *
484 * 1) Once the device is marked as being destroyed, we will fail all
485 * outgoing messages.
486 * 2) We permit incoming messages when the device is being destroyed,
487 * only to properly account for messages already sent out.
488 */
489
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700490static inline struct storvsc_device *get_out_stor_device(
491 struct hv_device *device)
492{
493 struct storvsc_device *stor_device;
494
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700495 stor_device = hv_get_drvdata(device);
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700496
497 if (stor_device && stor_device->destroy)
498 stor_device = NULL;
499
500 return stor_device;
501}
502
503
504static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
505{
506 dev->drain_notify = true;
507 wait_event(dev->waiting_to_drain,
508 atomic_read(&dev->num_outstanding_req) == 0);
509 dev->drain_notify = false;
510}
Hank Janssenbef4a342009-07-13 16:01:31 -0700511
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700512static inline struct storvsc_device *get_in_stor_device(
513 struct hv_device *device)
514{
515 struct storvsc_device *stor_device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700516
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700517 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700518
519 if (!stor_device)
520 goto get_in_err;
521
522 /*
523 * If the device is being destroyed; allow incoming
524 * traffic only to cleanup outstanding requests.
525 */
526
527 if (stor_device->destroy &&
528 (atomic_read(&stor_device->num_outstanding_req) == 0))
529 stor_device = NULL;
530
531get_in_err:
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700532 return stor_device;
533
534}
535
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800536static void destroy_bounce_buffer(struct scatterlist *sgl,
537 unsigned int sg_count)
538{
539 int i;
540 struct page *page_buf;
541
542 for (i = 0; i < sg_count; i++) {
543 page_buf = sg_page((&sgl[i]));
544 if (page_buf != NULL)
545 __free_page(page_buf);
546 }
547
548 kfree(sgl);
549}
550
551static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
552{
553 int i;
554
555 /* No need to check */
556 if (sg_count < 2)
557 return -1;
558
559 /* We have at least 2 sg entries */
560 for (i = 0; i < sg_count; i++) {
561 if (i == 0) {
562 /* make sure 1st one does not have hole */
563 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
564 return i;
565 } else if (i == sg_count - 1) {
566 /* make sure last one does not have hole */
567 if (sgl[i].offset != 0)
568 return i;
569 } else {
570 /* make sure no hole in the middle */
571 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
572 return i;
573 }
574 }
575 return -1;
576}
577
578static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
579 unsigned int sg_count,
580 unsigned int len,
581 int write)
582{
583 int i;
584 int num_pages;
585 struct scatterlist *bounce_sgl;
586 struct page *page_buf;
587 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
588
589 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
590
591 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
592 if (!bounce_sgl)
593 return NULL;
594
K. Y. Srinivasan9d2696e2013-02-06 05:15:28 -0800595 sg_init_table(bounce_sgl, num_pages);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800596 for (i = 0; i < num_pages; i++) {
597 page_buf = alloc_page(GFP_ATOMIC);
598 if (!page_buf)
599 goto cleanup;
600 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
601 }
602
603 return bounce_sgl;
604
605cleanup:
606 destroy_bounce_buffer(bounce_sgl, num_pages);
607 return NULL;
608}
609
Linus Torvalds9f393832012-03-21 09:40:26 -0700610/* Disgusting wrapper functions */
611static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
612{
613 void *addr = kmap_atomic(sg_page(sgl + idx));
614 return (unsigned long)addr;
615}
616
617static inline void sg_kunmap_atomic(unsigned long addr)
618{
619 kunmap_atomic((void *)addr);
620}
621
622
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800623/* Assume the original sgl has enough room */
624static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
625 struct scatterlist *bounce_sgl,
626 unsigned int orig_sgl_count,
627 unsigned int bounce_sgl_count)
628{
629 int i;
630 int j = 0;
631 unsigned long src, dest;
632 unsigned int srclen, destlen, copylen;
633 unsigned int total_copied = 0;
634 unsigned long bounce_addr = 0;
635 unsigned long dest_addr = 0;
636 unsigned long flags;
637
638 local_irq_save(flags);
639
640 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700641 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800642 dest = dest_addr;
643 destlen = orig_sgl[i].length;
644
645 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700646 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800647
648 while (destlen) {
649 src = bounce_addr + bounce_sgl[j].offset;
650 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
651
652 copylen = min(srclen, destlen);
653 memcpy((void *)dest, (void *)src, copylen);
654
655 total_copied += copylen;
656 bounce_sgl[j].offset += copylen;
657 destlen -= copylen;
658 dest += copylen;
659
660 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
661 /* full */
Linus Torvalds9f393832012-03-21 09:40:26 -0700662 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800663 j++;
664
665 /*
666 * It is possible that the number of elements
667 * in the bounce buffer may not be equal to
668 * the number of elements in the original
669 * scatter list. Handle this correctly.
670 */
671
672 if (j == bounce_sgl_count) {
673 /*
674 * We are done; cleanup and return.
675 */
Linus Torvalds9f393832012-03-21 09:40:26 -0700676 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800677 local_irq_restore(flags);
678 return total_copied;
679 }
680
681 /* if we need to use another bounce buffer */
682 if (destlen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700683 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800684 } else if (destlen == 0 && i == orig_sgl_count - 1) {
685 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700686 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800687 }
688 }
689
Linus Torvalds9f393832012-03-21 09:40:26 -0700690 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800691 }
692
693 local_irq_restore(flags);
694
695 return total_copied;
696}
697
698/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
699static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
700 struct scatterlist *bounce_sgl,
701 unsigned int orig_sgl_count)
702{
703 int i;
704 int j = 0;
705 unsigned long src, dest;
706 unsigned int srclen, destlen, copylen;
707 unsigned int total_copied = 0;
708 unsigned long bounce_addr = 0;
709 unsigned long src_addr = 0;
710 unsigned long flags;
711
712 local_irq_save(flags);
713
714 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700715 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800716 src = src_addr;
717 srclen = orig_sgl[i].length;
718
719 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700720 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800721
722 while (srclen) {
723 /* assume bounce offset always == 0 */
724 dest = bounce_addr + bounce_sgl[j].length;
725 destlen = PAGE_SIZE - bounce_sgl[j].length;
726
727 copylen = min(srclen, destlen);
728 memcpy((void *)dest, (void *)src, copylen);
729
730 total_copied += copylen;
731 bounce_sgl[j].length += copylen;
732 srclen -= copylen;
733 src += copylen;
734
735 if (bounce_sgl[j].length == PAGE_SIZE) {
736 /* full..move to next entry */
Linus Torvalds9f393832012-03-21 09:40:26 -0700737 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800738 j++;
739
740 /* if we need to use another bounce buffer */
741 if (srclen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700742 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800743
744 } else if (srclen == 0 && i == orig_sgl_count - 1) {
745 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700746 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800747 }
748 }
749
Linus Torvalds9f393832012-03-21 09:40:26 -0700750 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800751 }
752
753 local_irq_restore(flags);
754
755 return total_copied;
756}
757
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700758static int storvsc_channel_init(struct hv_device *device)
759{
760 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800761 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700762 struct vstor_packet *vstor_packet;
763 int ret, t;
764
765 stor_device = get_out_stor_device(device);
766 if (!stor_device)
767 return -ENODEV;
768
769 request = &stor_device->init_request;
770 vstor_packet = &request->vstor_packet;
771
772 /*
773 * Now, initiate the vsc/vsp initialization protocol on the open
774 * channel
775 */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800776 memset(request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700777 init_completion(&request->wait_event);
778 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
779 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
780
781 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700782 (sizeof(struct vstor_packet) -
783 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700784 (unsigned long)request,
785 VM_PKT_DATA_INBAND,
786 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
787 if (ret != 0)
788 goto cleanup;
789
790 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
791 if (t == 0) {
792 ret = -ETIMEDOUT;
793 goto cleanup;
794 }
795
796 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
797 vstor_packet->status != 0)
798 goto cleanup;
799
800
801 /* reuse the packet for version range supported */
802 memset(vstor_packet, 0, sizeof(struct vstor_packet));
803 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
804 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
805
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800806 vstor_packet->version.major_minor =
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700807 storvsc_get_version(vmstor_current_major, vmstor_current_minor);
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800808
809 /*
810 * The revision number is only used in Windows; set it to 0.
811 */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800812 vstor_packet->version.revision = 0;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700813
814 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700815 (sizeof(struct vstor_packet) -
816 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700817 (unsigned long)request,
818 VM_PKT_DATA_INBAND,
819 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
820 if (ret != 0)
821 goto cleanup;
822
823 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
824 if (t == 0) {
825 ret = -ETIMEDOUT;
826 goto cleanup;
827 }
828
829 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
830 vstor_packet->status != 0)
831 goto cleanup;
832
833
834 memset(vstor_packet, 0, sizeof(struct vstor_packet));
835 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
836 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700837
838 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700839 (sizeof(struct vstor_packet) -
840 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700841 (unsigned long)request,
842 VM_PKT_DATA_INBAND,
843 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
844
845 if (ret != 0)
846 goto cleanup;
847
848 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
849 if (t == 0) {
850 ret = -ETIMEDOUT;
851 goto cleanup;
852 }
853
854 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
855 vstor_packet->status != 0)
856 goto cleanup;
857
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700858 memset(vstor_packet, 0, sizeof(struct vstor_packet));
859 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
860 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
861
862 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -0700863 (sizeof(struct vstor_packet) -
864 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700865 (unsigned long)request,
866 VM_PKT_DATA_INBAND,
867 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
868
869 if (ret != 0)
870 goto cleanup;
871
872 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
873 if (t == 0) {
874 ret = -ETIMEDOUT;
875 goto cleanup;
876 }
877
878 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
879 vstor_packet->status != 0)
880 goto cleanup;
881
882
883cleanup:
884 return ret;
885}
886
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800887static void storvsc_handle_error(struct vmscsi_request *vm_srb,
888 struct scsi_cmnd *scmnd,
889 struct Scsi_Host *host,
890 u8 asc, u8 ascq)
891{
892 struct storvsc_scan_work *wrk;
893 void (*process_err_fn)(struct work_struct *work);
894 bool do_work = false;
895
896 switch (vm_srb->srb_status) {
897 case SRB_STATUS_ERROR:
898 /*
899 * If there is an error; offline the device since all
900 * error recovery strategies would have already been
901 * deployed on the host side. However, if the command
902 * were a pass-through command deal with it appropriately.
903 */
904 switch (scmnd->cmnd[0]) {
905 case ATA_16:
906 case ATA_12:
907 set_host_byte(scmnd, DID_PASSTHROUGH);
908 break;
909 default:
910 set_host_byte(scmnd, DID_TARGET_FAILURE);
911 }
912 break;
913 case SRB_STATUS_INVALID_LUN:
914 do_work = true;
915 process_err_fn = storvsc_remove_lun;
916 break;
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800917 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
918 if ((asc == 0x2a) && (ascq == 0x9)) {
919 do_work = true;
920 process_err_fn = storvsc_device_scan;
921 /*
922 * Retry the I/O that trigerred this.
923 */
924 set_host_byte(scmnd, DID_REQUEUE);
925 }
926 break;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800927 }
K. Y. Srinivasan67812092013-02-21 12:04:53 -0800928
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800929 if (!do_work)
930 return;
931
932 /*
933 * We need to schedule work to process this error; schedule it.
934 */
935 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
936 if (!wrk) {
937 set_host_byte(scmnd, DID_TARGET_FAILURE);
938 return;
939 }
940
941 wrk->host = host;
942 wrk->lun = vm_srb->lun;
943 INIT_WORK(&wrk->work, process_err_fn);
944 schedule_work(&wrk->work);
945}
946
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800947
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800948static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800949{
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800950 struct scsi_cmnd *scmnd = cmd_request->cmd;
951 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
952 void (*scsi_done_fn)(struct scsi_cmnd *);
953 struct scsi_sense_hdr sense_hdr;
954 struct vmscsi_request *vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800955 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800956 struct Scsi_Host *host;
957 struct storvsc_device *stor_dev;
958 struct hv_device *dev = host_dev->dev;
959
960 stor_dev = get_in_stor_device(dev);
961 host = stor_dev->host;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800962
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800963 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800964 if (cmd_request->bounce_sgl_count) {
965 if (vm_srb->data_in == READ_TYPE)
966 copy_from_bounce_buffer(scsi_sglist(scmnd),
967 cmd_request->bounce_sgl,
968 scsi_sg_count(scmnd),
969 cmd_request->bounce_sgl_count);
970 destroy_bounce_buffer(cmd_request->bounce_sgl,
971 cmd_request->bounce_sgl_count);
972 }
973
K. Y. Srinivasan42e22ca2012-04-05 12:26:52 -0700974 scmnd->result = vm_srb->scsi_status;
975
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800976 if (scmnd->result) {
977 if (scsi_normalize_sense(scmnd->sense_buffer,
978 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
979 scsi_print_sense_hdr("storvsc", &sense_hdr);
980 }
981
K. Y. Srinivasanc50bd442013-02-21 12:04:52 -0800982 if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
983 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
984 sense_hdr.ascq);
985
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800986 scsi_set_resid(scmnd,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800987 cmd_request->data_buffer.len -
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800988 vm_srb->data_transfer_length);
989
990 scsi_done_fn = scmnd->scsi_done;
991
992 scmnd->host_scribble = NULL;
993 scmnd->scsi_done = NULL;
994
995 scsi_done_fn(scmnd);
996
997 mempool_free(cmd_request, memp->request_mempool);
998}
999
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001000static void storvsc_on_io_completion(struct hv_device *device,
1001 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001002 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001003{
1004 struct storvsc_device *stor_device;
1005 struct vstor_packet *stor_pkt;
1006
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001007 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001008 stor_pkt = &request->vstor_packet;
1009
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001010 /*
1011 * The current SCSI handling on the host side does
1012 * not correctly handle:
1013 * INQUIRY command with page code parameter set to 0x80
1014 * MODE_SENSE command with cmd[2] == 0x1c
1015 *
1016 * Setup srb and scsi status so this won't be fatal.
1017 * We do this so we can distinguish truly fatal failues
1018 * (srb status == 0x4) and off-line the device in that case.
1019 */
1020
1021 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -08001022 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001023 vstor_packet->vm_srb.scsi_status = 0;
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001024 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -07001025 }
1026
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001027
1028 /* Copy over the status...etc */
1029 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
1030 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
1031 stor_pkt->vm_srb.sense_info_length =
1032 vstor_packet->vm_srb.sense_info_length;
1033
1034 if (vstor_packet->vm_srb.scsi_status != 0 ||
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001035 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001036 dev_warn(&device->device,
1037 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
1038 stor_pkt->vm_srb.cdb[0],
1039 vstor_packet->vm_srb.scsi_status,
1040 vstor_packet->vm_srb.srb_status);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001041 }
1042
1043 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
1044 /* CHECK_CONDITION */
K. Y. Srinivasan16046322012-01-12 12:37:57 -08001045 if (vstor_packet->vm_srb.srb_status &
1046 SRB_STATUS_AUTOSENSE_VALID) {
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001047 /* autosense data available */
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -06001048 dev_warn(&device->device,
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001049 "stor pkt %p autosense data valid - len %d\n",
1050 request,
1051 vstor_packet->vm_srb.sense_info_length);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001052
1053 memcpy(request->sense_buffer,
1054 vstor_packet->vm_srb.sense_data,
1055 vstor_packet->vm_srb.sense_info_length);
1056
1057 }
1058 }
1059
1060 stor_pkt->vm_srb.data_transfer_length =
1061 vstor_packet->vm_srb.data_transfer_length;
1062
K. Y. Srinivasan27073882012-01-12 12:38:01 -08001063 storvsc_command_completion(request);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001064
1065 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
1066 stor_device->drain_notify)
1067 wake_up(&stor_device->waiting_to_drain);
1068
1069
1070}
1071
1072static void storvsc_on_receive(struct hv_device *device,
1073 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001074 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001075{
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001076 struct storvsc_scan_work *work;
1077 struct storvsc_device *stor_device;
1078
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001079 switch (vstor_packet->operation) {
1080 case VSTOR_OPERATION_COMPLETE_IO:
1081 storvsc_on_io_completion(device, vstor_packet, request);
1082 break;
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001083
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001084 case VSTOR_OPERATION_REMOVE_DEVICE:
K. Y. Srinivasan12675792011-11-08 09:01:49 -08001085 case VSTOR_OPERATION_ENUMERATE_BUS:
1086 stor_device = get_in_stor_device(device);
1087 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
1088 if (!work)
1089 return;
1090
1091 INIT_WORK(&work->work, storvsc_bus_scan);
1092 work->host = stor_device->host;
1093 schedule_work(&work->work);
1094 break;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001095
1096 default:
1097 break;
1098 }
1099}
1100
1101static void storvsc_on_channel_callback(void *context)
1102{
1103 struct hv_device *device = (struct hv_device *)context;
1104 struct storvsc_device *stor_device;
1105 u32 bytes_recvd;
1106 u64 request_id;
1107 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001108 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001109 int ret;
1110
1111
1112 stor_device = get_in_stor_device(device);
1113 if (!stor_device)
1114 return;
1115
1116 do {
1117 ret = vmbus_recvpacket(device->channel, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001118 ALIGN((sizeof(struct vstor_packet) -
1119 vmscsi_size_delta), 8),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001120 &bytes_recvd, &request_id);
1121 if (ret == 0 && bytes_recvd > 0) {
1122
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001123 request = (struct storvsc_cmd_request *)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001124 (unsigned long)request_id;
1125
1126 if ((request == &stor_device->init_request) ||
1127 (request == &stor_device->reset_request)) {
1128
1129 memcpy(&request->vstor_packet, packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001130 (sizeof(struct vstor_packet) -
1131 vmscsi_size_delta));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001132 complete(&request->wait_event);
1133 } else {
1134 storvsc_on_receive(device,
1135 (struct vstor_packet *)packet,
1136 request);
1137 }
1138 } else {
1139 break;
1140 }
1141 } while (1);
1142
1143 return;
1144}
1145
1146static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
1147{
1148 struct vmstorage_channel_properties props;
1149 int ret;
1150
1151 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
1152
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001153 ret = vmbus_open(device->channel,
1154 ring_size,
1155 ring_size,
1156 (void *)&props,
1157 sizeof(struct vmstorage_channel_properties),
1158 storvsc_on_channel_callback, device);
1159
1160 if (ret != 0)
1161 return ret;
1162
1163 ret = storvsc_channel_init(device);
1164
1165 return ret;
1166}
1167
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001168static int storvsc_dev_remove(struct hv_device *device)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001169{
1170 struct storvsc_device *stor_device;
1171 unsigned long flags;
1172
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001173 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001174
1175 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1176 stor_device->destroy = true;
1177 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1178
1179 /*
1180 * At this point, all outbound traffic should be disable. We
1181 * only allow inbound traffic (responses) to proceed so that
1182 * outstanding requests can be completed.
1183 */
1184
1185 storvsc_wait_to_drain(stor_device);
1186
1187 /*
1188 * Since we have already drained, we don't need to busy wait
1189 * as was done in final_release_stor_device()
1190 * Note that we cannot set the ext pointer to NULL until
1191 * we have drained - to drain the outgoing packets, we need to
1192 * allow incoming packets.
1193 */
1194 spin_lock_irqsave(&device->channel->inbound_lock, flags);
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001195 hv_set_drvdata(device, NULL);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001196 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1197
1198 /* Close the channel */
1199 vmbus_close(device->channel);
1200
1201 kfree(stor_device);
1202 return 0;
1203}
1204
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001205static int storvsc_do_io(struct hv_device *device,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001206 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001207{
1208 struct storvsc_device *stor_device;
1209 struct vstor_packet *vstor_packet;
1210 int ret = 0;
1211
1212 vstor_packet = &request->vstor_packet;
1213 stor_device = get_out_stor_device(device);
1214
1215 if (!stor_device)
1216 return -ENODEV;
1217
1218
1219 request->device = device;
1220
1221
1222 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1223
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001224 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
1225 vmscsi_size_delta);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001226
1227
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001228 vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001229
1230
1231 vstor_packet->vm_srb.data_transfer_length =
1232 request->data_buffer.len;
1233
1234 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1235
1236 if (request->data_buffer.len) {
1237 ret = vmbus_sendpacket_multipagebuffer(device->channel,
1238 &request->data_buffer,
1239 vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001240 (sizeof(struct vstor_packet) -
1241 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001242 (unsigned long)request);
1243 } else {
1244 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001245 (sizeof(struct vstor_packet) -
1246 vmscsi_size_delta),
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001247 (unsigned long)request,
1248 VM_PKT_DATA_INBAND,
1249 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1250 }
1251
1252 if (ret != 0)
1253 return ret;
1254
1255 atomic_inc(&stor_device->num_outstanding_req);
1256
1257 return ret;
1258}
1259
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001260static int storvsc_device_alloc(struct scsi_device *sdevice)
1261{
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001262 struct stor_mem_pools *memp;
1263 int number = STORVSC_MIN_BUF_NR;
1264
1265 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1266 if (!memp)
1267 return -ENOMEM;
1268
1269 memp->request_pool =
1270 kmem_cache_create(dev_name(&sdevice->sdev_dev),
1271 sizeof(struct storvsc_cmd_request), 0,
1272 SLAB_HWCACHE_ALIGN, NULL);
1273
1274 if (!memp->request_pool)
1275 goto err0;
1276
1277 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1278 mempool_free_slab,
1279 memp->request_pool);
1280
1281 if (!memp->request_mempool)
1282 goto err1;
1283
1284 sdevice->hostdata = memp;
1285
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001286 return 0;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001287
1288err1:
1289 kmem_cache_destroy(memp->request_pool);
1290
1291err0:
1292 kfree(memp);
1293 return -ENOMEM;
1294}
1295
1296static void storvsc_device_destroy(struct scsi_device *sdevice)
1297{
1298 struct stor_mem_pools *memp = sdevice->hostdata;
1299
1300 mempool_destroy(memp->request_mempool);
1301 kmem_cache_destroy(memp->request_pool);
1302 kfree(memp);
1303 sdevice->hostdata = NULL;
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001304}
1305
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001306static int storvsc_device_configure(struct scsi_device *sdevice)
1307{
1308 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1309 STORVSC_MAX_IO_REQUESTS);
1310
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001311 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1312
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001313 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001314
K. Y. Srinivasan893def32013-06-04 12:05:05 -07001315 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
1316
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001317 sdevice->no_write_same = 1;
1318
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001319 return 0;
1320}
1321
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001322static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1323 sector_t capacity, int *info)
1324{
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001325 sector_t nsect = capacity;
1326 sector_t cylinders = nsect;
1327 int heads, sectors_pt;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001328
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001329 /*
1330 * We are making up these values; let us keep it simple.
1331 */
1332 heads = 0xff;
1333 sectors_pt = 0x3f; /* Sectors per track */
1334 sector_div(cylinders, heads * sectors_pt);
1335 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1336 cylinders = 0xffff;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001337
1338 info[0] = heads;
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001339 info[1] = sectors_pt;
1340 info[2] = (int)cylinders;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001341
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001342 return 0;
1343}
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001344
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001345static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001346{
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001347 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1348 struct hv_device *device = host_dev->dev;
1349
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001350 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001351 struct storvsc_cmd_request *request;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001352 struct vstor_packet *vstor_packet;
1353 int ret, t;
1354
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001355
K. Y. Srinivasan1eaaddf2011-08-27 11:31:03 -07001356 stor_device = get_out_stor_device(device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001357 if (!stor_device)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001358 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001359
1360 request = &stor_device->reset_request;
1361 vstor_packet = &request->vstor_packet;
1362
1363 init_completion(&request->wait_event);
1364
1365 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1366 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1367 vstor_packet->vm_srb.path_id = stor_device->path_id;
1368
1369 ret = vmbus_sendpacket(device->channel, vstor_packet,
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001370 (sizeof(struct vstor_packet) -
1371 vmscsi_size_delta),
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001372 (unsigned long)&stor_device->reset_request,
1373 VM_PKT_DATA_INBAND,
1374 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1375 if (ret != 0)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001376 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001377
K. Y. Srinivasan46d2eb62011-06-16 13:16:36 -07001378 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001379 if (t == 0)
1380 return TIMEOUT_ERROR;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001381
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001382
1383 /*
1384 * At this point, all outstanding requests in the adapter
1385 * should have been flushed out and return to us
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001386 * There is a potential race here where the host may be in
1387 * the process of responding when we return from here.
1388 * Just wait for all in-transit packets to be accounted for
1389 * before we return from here.
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001390 */
K. Y. Srinivasan5c1b10a2012-10-02 11:03:31 -07001391 storvsc_wait_to_drain(stor_device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001392
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001393 return SUCCESS;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001394}
1395
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001396static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001397{
1398 bool allowed = true;
1399 u8 scsi_op = scmnd->cmnd[0];
1400
1401 switch (scsi_op) {
Olaf Hering3e8f4f42013-02-21 12:04:51 -08001402 /* the host does not handle WRITE_SAME, log accident usage */
1403 case WRITE_SAME:
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001404 /*
1405 * smartd sends this command and the host does not handle
1406 * this. So, don't send it.
1407 */
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001408 case SET_WINDOW:
K. Y. Srinivasan59e00e72011-11-08 09:01:42 -08001409 scmnd->result = ILLEGAL_REQUEST << 16;
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001410 allowed = false;
1411 break;
1412 default:
1413 break;
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001414 }
1415 return allowed;
1416}
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001417
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001418static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001419{
1420 int ret;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001421 struct hv_host_device *host_dev = shost_priv(host);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001422 struct hv_device *dev = host_dev->dev;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001423 struct storvsc_cmd_request *cmd_request;
1424 unsigned int request_size = 0;
1425 int i;
1426 struct scatterlist *sgl;
1427 unsigned int sg_count = 0;
1428 struct vmscsi_request *vm_srb;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001429 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001430
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001431 if (!storvsc_scsi_cmd_ok(scmnd)) {
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001432 scmnd->scsi_done(scmnd);
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001433 return 0;
1434 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001435
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001436 request_size = sizeof(struct storvsc_cmd_request);
1437
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001438 cmd_request = mempool_alloc(memp->request_mempool,
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001439 GFP_ATOMIC);
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001440
1441 /*
1442 * We might be invoked in an interrupt context; hence
1443 * mempool_alloc() can fail.
1444 */
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001445 if (!cmd_request)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001446 return SCSI_MLQUEUE_DEVICE_BUSY;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001447
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001448 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001449
1450 /* Setup the cmd request */
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001451 cmd_request->cmd = scmnd;
1452
1453 scmnd->host_scribble = (unsigned char *)cmd_request;
1454
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001455 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001456 vm_srb->win8_extension.time_out_value = 60;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001457
1458
1459 /* Build the SRB */
1460 switch (scmnd->sc_data_direction) {
1461 case DMA_TO_DEVICE:
1462 vm_srb->data_in = WRITE_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001463 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
1464 vm_srb->win8_extension.srb_flags |=
1465 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1466 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001467 break;
1468 case DMA_FROM_DEVICE:
1469 vm_srb->data_in = READ_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001470 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
1471 vm_srb->win8_extension.srb_flags |=
1472 (SRB_FLAGS_QUEUE_ACTION_ENABLE |
1473 SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001474 break;
1475 default:
1476 vm_srb->data_in = UNKNOWN_TYPE;
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001477 vm_srb->win8_extension.srb_flags = 0;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001478 break;
1479 }
1480
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001481
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001482 vm_srb->port_number = host_dev->port;
1483 vm_srb->path_id = scmnd->device->channel;
1484 vm_srb->target_id = scmnd->device->id;
1485 vm_srb->lun = scmnd->device->lun;
1486
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001487 vm_srb->cdb_length = scmnd->cmd_len;
1488
1489 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1490
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001491 cmd_request->sense_buffer = scmnd->sense_buffer;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001492
1493
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001494 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001495 if (scsi_sg_count(scmnd)) {
1496 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1497 sg_count = scsi_sg_count(scmnd);
1498
1499 /* check if we need to bounce the sgl */
1500 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1501 cmd_request->bounce_sgl =
1502 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
K. Y. Srinivasan6e8087a2011-12-07 07:15:52 -08001503 scsi_bufflen(scmnd),
1504 vm_srb->data_in);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001505 if (!cmd_request->bounce_sgl) {
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001506 ret = SCSI_MLQUEUE_HOST_BUSY;
1507 goto queue_error;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001508 }
1509
1510 cmd_request->bounce_sgl_count =
1511 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1512 PAGE_SHIFT;
1513
K. Y. Srinivasanfa23b8c2011-08-27 11:31:21 -07001514 if (vm_srb->data_in == WRITE_TYPE)
1515 copy_to_bounce_buffer(sgl,
1516 cmd_request->bounce_sgl,
1517 scsi_sg_count(scmnd));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001518
1519 sgl = cmd_request->bounce_sgl;
1520 sg_count = cmd_request->bounce_sgl_count;
1521 }
1522
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001523 cmd_request->data_buffer.offset = sgl[0].offset;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001524
1525 for (i = 0; i < sg_count; i++)
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001526 cmd_request->data_buffer.pfn_array[i] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001527 page_to_pfn(sg_page((&sgl[i])));
1528
1529 } else if (scsi_sglist(scmnd)) {
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001530 cmd_request->data_buffer.offset =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001531 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001532 cmd_request->data_buffer.pfn_array[0] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001533 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1534 }
1535
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001536 /* Invokes the vsc to start an IO */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001537 ret = storvsc_do_io(dev, cmd_request);
K. Y. Srinivasan636f0fd2011-05-10 07:54:50 -07001538
K. Y. Srinivasand2598f02011-08-25 09:48:58 -07001539 if (ret == -EAGAIN) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001540 /* no more space */
1541
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001542 if (cmd_request->bounce_sgl_count) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001543 destroy_bounce_buffer(cmd_request->bounce_sgl,
K. Y. Srinivasan70691ec2011-08-27 11:31:29 -07001544 cmd_request->bounce_sgl_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001545
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001546 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1547 goto queue_error;
1548 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001549 }
1550
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001551 return 0;
1552
1553queue_error:
1554 mempool_free(cmd_request, memp->request_mempool);
1555 scmnd->host_scribble = NULL;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001556 return ret;
1557}
1558
Hank Janssenbef4a342009-07-13 16:01:31 -07001559static struct scsi_host_template scsi_driver = {
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001560 .module = THIS_MODULE,
1561 .name = "storvsc_host_t",
1562 .bios_param = storvsc_get_chs,
1563 .queuecommand = storvsc_queuecommand,
1564 .eh_host_reset_handler = storvsc_host_reset_handler,
1565 .slave_alloc = storvsc_device_alloc,
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001566 .slave_destroy = storvsc_device_destroy,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001567 .slave_configure = storvsc_device_configure,
1568 .cmd_per_lun = 1,
1569 /* 64 max_queue * 1 target */
Lars Lindley0686e4f2010-03-11 23:51:23 +01001570 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001571 .this_id = -1,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001572 /* no use setting to 0 since ll_blk_rw reset it to 1 */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001573 /* currently 32 */
1574 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
K. Y. Srinivasan039db522011-12-01 04:59:16 -08001575 .use_clustering = DISABLE_CLUSTERING,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001576 /* Make sure we dont get a sg segment crosses a page boundary */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001577 .dma_boundary = PAGE_SIZE-1,
Hank Janssenbef4a342009-07-13 16:01:31 -07001578};
1579
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001580enum {
1581 SCSI_GUID,
1582 IDE_GUID,
1583};
1584
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001585static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001586 /* SCSI guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001587 { HV_SCSI_GUID,
1588 .driver_data = SCSI_GUID
1589 },
K. Y. Srinivasan21e37742011-08-27 11:31:18 -07001590 /* IDE guid */
K. Y. Srinivasan35c3bc22013-01-23 17:42:43 -08001591 { HV_IDE_GUID,
1592 .driver_data = IDE_GUID
1593 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001594 { },
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001595};
Hank Janssenbef4a342009-07-13 16:01:31 -07001596
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001597MODULE_DEVICE_TABLE(vmbus, id_table);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001598
K. Y. Srinivasan84946892011-09-13 10:59:38 -07001599static int storvsc_probe(struct hv_device *device,
1600 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001601{
1602 int ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001603 struct Scsi_Host *host;
1604 struct hv_host_device *host_dev;
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001605 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001606 int target = 0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001607 struct storvsc_device *stor_device;
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001608
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001609 /*
1610 * Based on the windows host we are running on,
1611 * set state to properly communicate with the host.
1612 */
1613
1614 if (vmbus_proto_version == VERSION_WIN8) {
1615 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
1616 vmscsi_size_delta = 0;
1617 vmstor_current_major = VMSTOR_WIN8_MAJOR;
1618 vmstor_current_minor = VMSTOR_WIN8_MINOR;
1619 } else {
1620 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
1621 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
1622 vmstor_current_major = VMSTOR_WIN7_MAJOR;
1623 vmstor_current_minor = VMSTOR_WIN7_MINOR;
1624 }
1625
1626
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001627 host = scsi_host_alloc(&scsi_driver,
1628 sizeof(struct hv_host_device));
1629 if (!host)
1630 return -ENOMEM;
1631
K. Y. Srinivasan7f33f302011-11-08 09:01:44 -08001632 host_dev = shost_priv(host);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001633 memset(host_dev, 0, sizeof(struct hv_host_device));
1634
1635 host_dev->port = host->host_no;
1636 host_dev->dev = device;
1637
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001638
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001639 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001640 if (!stor_device) {
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001641 ret = -ENOMEM;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001642 goto err_out0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001643 }
1644
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001645 stor_device->destroy = false;
1646 init_waitqueue_head(&stor_device->waiting_to_drain);
1647 stor_device->device = device;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001648 stor_device->host = host;
1649 hv_set_drvdata(device, stor_device);
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001650
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001651 stor_device->port_number = host->host_no;
1652 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001653 if (ret)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001654 goto err_out1;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001655
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001656 host_dev->path = stor_device->path_id;
1657 host_dev->target = stor_device->target_id;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001658
1659 /* max # of devices per target */
1660 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1661 /* max # of targets per channel */
1662 host->max_id = STORVSC_MAX_TARGETS;
1663 /* max # of channels */
1664 host->max_channel = STORVSC_MAX_CHANNELS - 1;
Mike Sterlingcf55f4a2011-09-06 16:10:55 -07001665 /* max cmd length */
1666 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001667
1668 /* Register the HBA and start the scsi bus scan */
1669 ret = scsi_add_host(host, &device->device);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001670 if (ret != 0)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001671 goto err_out2;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001672
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001673 if (!dev_is_ide) {
1674 scsi_scan_host(host);
K. Y. Srinivasan59d22952012-01-12 12:37:55 -08001675 } else {
1676 target = (device->dev_instance.b[5] << 8 |
1677 device->dev_instance.b[4]);
1678 ret = scsi_add_device(host, 0, target, 0);
1679 if (ret) {
1680 scsi_remove_host(host);
1681 goto err_out2;
1682 }
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001683 }
1684 return 0;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001685
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001686err_out2:
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001687 /*
1688 * Once we have connected with the host, we would need to
1689 * to invoke storvsc_dev_remove() to rollback this state and
1690 * this call also frees up the stor_device; hence the jump around
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001691 * err_out1 label.
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001692 */
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001693 storvsc_dev_remove(device);
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001694 goto err_out0;
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001695
1696err_out1:
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001697 kfree(stor_device);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001698
1699err_out0:
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001700 scsi_host_put(host);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001701 return ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001702}
1703
K. Y. Srinivasanddcbf652012-01-12 12:37:59 -08001704static int storvsc_remove(struct hv_device *dev)
1705{
1706 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1707 struct Scsi_Host *host = stor_device->host;
1708
1709 scsi_remove_host(host);
1710 storvsc_dev_remove(dev);
1711 scsi_host_put(host);
1712
1713 return 0;
1714}
1715
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001716static struct hv_driver storvsc_drv = {
K. Y. Srinivasanfafb0ef2011-11-08 09:01:46 -08001717 .name = KBUILD_MODNAME,
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001718 .id_table = id_table,
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001719 .probe = storvsc_probe,
1720 .remove = storvsc_remove,
K. Y. Srinivasan39ae6fa2011-05-10 07:54:46 -07001721};
K. Y. Srinivasan7bd05b92011-05-10 07:54:45 -07001722
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001723static int __init storvsc_drv_init(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001724{
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001725 u32 max_outstanding_req_per_channel;
1726
1727 /*
1728 * Divide the ring buffer data size (which is 1 page less
1729 * than the ring buffer size since that page is reserved for
1730 * the ring buffer indices) by the max request size (which is
1731 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1732 */
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001733 max_outstanding_req_per_channel =
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001734 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1735 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
K. Y. Srinivasan8b612fa2013-06-04 12:05:06 -07001736 sizeof(struct vstor_packet) + sizeof(u64) -
1737 vmscsi_size_delta,
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001738 sizeof(u64)));
Hank Janssenbef4a342009-07-13 16:01:31 -07001739
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001740 if (max_outstanding_req_per_channel <
K. Y. Srinivasanf8feed02011-05-10 07:54:24 -07001741 STORVSC_MAX_IO_REQUESTS)
K. Y. Srinivasanb06efc12011-08-25 09:49:10 -07001742 return -EINVAL;
Hank Janssenbef4a342009-07-13 16:01:31 -07001743
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001744 return vmbus_driver_register(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001745}
1746
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001747static void __exit storvsc_drv_exit(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001748{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001749 vmbus_driver_unregister(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001750}
1751
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001752MODULE_LICENSE("GPL");
Hank Janssen26c14cc2010-02-11 23:02:42 +00001753MODULE_VERSION(HV_DRV_VERSION);
Stephen Hemminger3afc7cc32010-05-06 21:44:45 -07001754MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001755module_init(storvsc_drv_init);
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001756module_exit(storvsc_drv_exit);