blob: 83a1972a1999b816dc287766c6a71c9f557bcedb [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
58 */
59
K. Y. Srinivasan85904a52012-01-12 12:38:04 -080060#define VMSTOR_CURRENT_MAJOR 4
61#define VMSTOR_CURRENT_MINOR 2
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070062
63
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070064/* Packet structure describing virtual storage requests. */
65enum vstor_packet_operation {
66 VSTOR_OPERATION_COMPLETE_IO = 1,
67 VSTOR_OPERATION_REMOVE_DEVICE = 2,
68 VSTOR_OPERATION_EXECUTE_SRB = 3,
69 VSTOR_OPERATION_RESET_LUN = 4,
70 VSTOR_OPERATION_RESET_ADAPTER = 5,
71 VSTOR_OPERATION_RESET_BUS = 6,
72 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
73 VSTOR_OPERATION_END_INITIALIZATION = 8,
74 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
75 VSTOR_OPERATION_QUERY_PROPERTIES = 10,
K. Y. Srinivasan2b9525f2011-11-08 09:01:48 -080076 VSTOR_OPERATION_ENUMERATE_BUS = 11,
77 VSTOR_OPERATION_MAXIMUM = 11
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070078};
79
80/*
81 * Platform neutral description of a scsi request -
82 * this remains the same across the write regardless of 32/64 bit
83 * note: it's patterned off the SCSI_PASS_THROUGH structure
84 */
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -080085#define STORVSC_MAX_CMD_LEN 0x10
86#define STORVSC_SENSE_BUFFER_SIZE 0x12
87#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070088
89struct vmscsi_request {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080090 u16 length;
91 u8 srb_status;
92 u8 scsi_status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070093
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080094 u8 port_number;
95 u8 path_id;
96 u8 target_id;
97 u8 lun;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -070098
K. Y. Srinivasanc6491142012-01-12 12:38:03 -080099 u8 cdb_length;
100 u8 sense_info_length;
101 u8 data_in;
102 u8 reserved;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700103
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800104 u32 data_transfer_length;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700105
106 union {
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -0800107 u8 cdb[STORVSC_MAX_CMD_LEN];
108 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
109 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700110 };
111} __attribute((packed));
112
113
114/*
115 * This structure is sent during the intialization phase to get the different
116 * properties of the channel.
117 */
118struct vmstorage_channel_properties {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800119 u16 protocol_version;
120 u8 path_id;
121 u8 target_id;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700122
123 /* Note: port number is only really known on the client side */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800124 u32 port_number;
125 u32 flags;
126 u32 max_transfer_bytes;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700127
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800128 /*
129 * This id is unique for each channel and will correspond with
130 * vendor specific data in the inquiry data.
131 */
132
133 u64 unique_id;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700134} __packed;
135
136/* This structure is sent during the storage protocol negotiations. */
137struct vmstorage_protocol_version {
138 /* Major (MSW) and minor (LSW) version numbers. */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800139 u16 major_minor;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700140
141 /*
142 * Revision number is auto-incremented whenever this file is changed
143 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
144 * definitely indicate incompatibility--but it does indicate mismatched
145 * builds.
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800146 * This is only used on the windows side. Just set it to 0.
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700147 */
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800148 u16 revision;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700149} __packed;
150
151/* Channel Property Flags */
152#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
153#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
154
155struct vstor_packet {
156 /* Requested operation type */
157 enum vstor_packet_operation operation;
158
159 /* Flags - see below for values */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800160 u32 flags;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700161
162 /* Status of the request returned from the server side. */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800163 u32 status;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700164
165 /* Data payload area */
166 union {
167 /*
168 * Structure used to forward SCSI commands from the
169 * client to the server.
170 */
171 struct vmscsi_request vm_srb;
172
173 /* Structure used to query channel properties. */
174 struct vmstorage_channel_properties storage_channel_properties;
175
176 /* Used during version negotiations. */
177 struct vmstorage_protocol_version version;
178 };
179} __packed;
180
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700181/*
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800182 * Packet Flags:
183 *
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700184 * This flag indicates that the server should send back a completion for this
185 * packet.
186 */
K. Y. Srinivasan09f03552012-01-12 12:37:54 -0800187
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700188#define REQUEST_COMPLETION_FLAG 0x1
189
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700190/* Matches Windows-end */
191enum storvsc_request_type {
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800192 WRITE_TYPE = 0,
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700193 READ_TYPE,
194 UNKNOWN_TYPE,
195};
196
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800197/*
198 * SRB status codes and masks; a subset of the codes used here.
199 */
200
201#define SRB_STATUS_AUTOSENSE_VALID 0x80
202#define SRB_STATUS_INVALID_LUN 0x20
203#define SRB_STATUS_SUCCESS 0x01
204#define SRB_STATUS_ERROR 0x04
205
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800206/*
207 * This is the end of Protocol specific defines.
208 */
209
210
211/*
212 * We setup a mempool to allocate request structures for this driver
213 * on a per-lun basis. The following define specifies the number of
214 * elements in the pool.
215 */
216
217#define STORVSC_MIN_BUF_NR 64
218static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
219
220module_param(storvsc_ringbuffer_size, int, S_IRUGO);
221MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
222
223#define STORVSC_MAX_IO_REQUESTS 128
224
225/*
226 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
227 * reality, the path/target is not used (ie always set to 0) so our
228 * scsi host adapter essentially has 1 bus with 1 target that contains
229 * up to 256 luns.
230 */
231#define STORVSC_MAX_LUNS_PER_TARGET 64
232#define STORVSC_MAX_TARGETS 1
233#define STORVSC_MAX_CHANNELS 1
234
235
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800236
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800237struct storvsc_cmd_request {
238 struct list_head entry;
239 struct scsi_cmnd *cmd;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700240
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800241 unsigned int bounce_sgl_count;
242 struct scatterlist *bounce_sgl;
243
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700244 struct hv_device *device;
245
246 /* Synchronize the request/response if needed */
247 struct completion wait_event;
248
249 unsigned char *sense_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700250 struct hv_multipage_buffer data_buffer;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700251 struct vstor_packet vstor_packet;
252};
253
254
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700255/* A storvsc device is a device object that contains a vmbus channel */
256struct storvsc_device {
257 struct hv_device *device;
258
259 bool destroy;
260 bool drain_notify;
261 atomic_t num_outstanding_req;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700262 struct Scsi_Host *host;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700263
264 wait_queue_head_t waiting_to_drain;
265
266 /*
267 * Each unique Port/Path/Target represents 1 channel ie scsi
268 * controller. In reality, the pathid, targetid is always 0
269 * and the port is set by us
270 */
271 unsigned int port_number;
272 unsigned char path_id;
273 unsigned char target_id;
274
275 /* Used for vsc/vsp channel reset process */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800276 struct storvsc_cmd_request init_request;
277 struct storvsc_cmd_request reset_request;
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700278};
279
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800280struct stor_mem_pools {
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700281 struct kmem_cache *request_pool;
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -0800282 mempool_t *request_mempool;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -0800283};
284
285struct hv_host_device {
286 struct hv_device *dev;
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -0700287 unsigned int port;
288 unsigned char path;
289 unsigned char target;
290};
291
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800292struct storvsc_scan_work {
293 struct work_struct work;
294 struct Scsi_Host *host;
295 uint lun;
296};
297
298static void storvsc_bus_scan(struct work_struct *work)
299{
300 struct storvsc_scan_work *wrk;
301 int id, order_id;
302
303 wrk = container_of(work, struct storvsc_scan_work, work);
304 for (id = 0; id < wrk->host->max_id; ++id) {
305 if (wrk->host->reverse_ordering)
306 order_id = wrk->host->max_id - id - 1;
307 else
308 order_id = id;
309
310 scsi_scan_target(&wrk->host->shost_gendev, 0,
311 order_id, SCAN_WILD_CARD, 1);
312 }
313 kfree(wrk);
314}
315
K. Y. Srinivasanb4017312011-11-08 09:01:50 -0800316static void storvsc_remove_lun(struct work_struct *work)
317{
318 struct storvsc_scan_work *wrk;
319 struct scsi_device *sdev;
320
321 wrk = container_of(work, struct storvsc_scan_work, work);
322 if (!scsi_host_get(wrk->host))
323 goto done;
324
325 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
326
327 if (sdev) {
328 scsi_remove_device(sdev);
329 scsi_device_put(sdev);
330 }
331 scsi_host_put(wrk->host);
332
333done:
334 kfree(wrk);
335}
336
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800337/*
K. Y. Srinivasanaf9584b2012-01-12 12:38:08 -0800338 * Major/minor macros. Minor version is in LSB, meaning that earlier flat
339 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
340 */
341
342static inline u16 storvsc_get_version(u8 major, u8 minor)
343{
344 u16 version;
345
346 version = ((major << 8) | minor);
347 return version;
348}
349
350/*
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800351 * We can get incoming messages from the host that are not in response to
352 * messages that we have sent out. An example of this would be messages
353 * received by the guest to notify dynamic addition/removal of LUNs. To
354 * deal with potential race conditions where the driver may be in the
355 * midst of being unloaded when we might receive an unsolicited message
356 * from the host, we have implemented a mechanism to gurantee sequential
357 * consistency:
358 *
359 * 1) Once the device is marked as being destroyed, we will fail all
360 * outgoing messages.
361 * 2) We permit incoming messages when the device is being destroyed,
362 * only to properly account for messages already sent out.
363 */
364
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700365static inline struct storvsc_device *get_out_stor_device(
366 struct hv_device *device)
367{
368 struct storvsc_device *stor_device;
369
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700370 stor_device = hv_get_drvdata(device);
K. Y. Srinivasanf0d79fe2011-08-27 11:31:24 -0700371
372 if (stor_device && stor_device->destroy)
373 stor_device = NULL;
374
375 return stor_device;
376}
377
378
379static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
380{
381 dev->drain_notify = true;
382 wait_event(dev->waiting_to_drain,
383 atomic_read(&dev->num_outstanding_req) == 0);
384 dev->drain_notify = false;
385}
Hank Janssenbef4a342009-07-13 16:01:31 -0700386
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700387static inline struct storvsc_device *get_in_stor_device(
388 struct hv_device *device)
389{
390 struct storvsc_device *stor_device;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700391
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700392 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700393
394 if (!stor_device)
395 goto get_in_err;
396
397 /*
398 * If the device is being destroyed; allow incoming
399 * traffic only to cleanup outstanding requests.
400 */
401
402 if (stor_device->destroy &&
403 (atomic_read(&stor_device->num_outstanding_req) == 0))
404 stor_device = NULL;
405
406get_in_err:
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700407 return stor_device;
408
409}
410
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800411static void destroy_bounce_buffer(struct scatterlist *sgl,
412 unsigned int sg_count)
413{
414 int i;
415 struct page *page_buf;
416
417 for (i = 0; i < sg_count; i++) {
418 page_buf = sg_page((&sgl[i]));
419 if (page_buf != NULL)
420 __free_page(page_buf);
421 }
422
423 kfree(sgl);
424}
425
426static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
427{
428 int i;
429
430 /* No need to check */
431 if (sg_count < 2)
432 return -1;
433
434 /* We have at least 2 sg entries */
435 for (i = 0; i < sg_count; i++) {
436 if (i == 0) {
437 /* make sure 1st one does not have hole */
438 if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
439 return i;
440 } else if (i == sg_count - 1) {
441 /* make sure last one does not have hole */
442 if (sgl[i].offset != 0)
443 return i;
444 } else {
445 /* make sure no hole in the middle */
446 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
447 return i;
448 }
449 }
450 return -1;
451}
452
453static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
454 unsigned int sg_count,
455 unsigned int len,
456 int write)
457{
458 int i;
459 int num_pages;
460 struct scatterlist *bounce_sgl;
461 struct page *page_buf;
462 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
463
464 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
465
466 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
467 if (!bounce_sgl)
468 return NULL;
469
470 for (i = 0; i < num_pages; i++) {
471 page_buf = alloc_page(GFP_ATOMIC);
472 if (!page_buf)
473 goto cleanup;
474 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
475 }
476
477 return bounce_sgl;
478
479cleanup:
480 destroy_bounce_buffer(bounce_sgl, num_pages);
481 return NULL;
482}
483
Linus Torvalds9f393832012-03-21 09:40:26 -0700484/* Disgusting wrapper functions */
485static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
486{
487 void *addr = kmap_atomic(sg_page(sgl + idx));
488 return (unsigned long)addr;
489}
490
491static inline void sg_kunmap_atomic(unsigned long addr)
492{
493 kunmap_atomic((void *)addr);
494}
495
496
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800497/* Assume the original sgl has enough room */
498static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
499 struct scatterlist *bounce_sgl,
500 unsigned int orig_sgl_count,
501 unsigned int bounce_sgl_count)
502{
503 int i;
504 int j = 0;
505 unsigned long src, dest;
506 unsigned int srclen, destlen, copylen;
507 unsigned int total_copied = 0;
508 unsigned long bounce_addr = 0;
509 unsigned long dest_addr = 0;
510 unsigned long flags;
511
512 local_irq_save(flags);
513
514 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700515 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800516 dest = dest_addr;
517 destlen = orig_sgl[i].length;
518
519 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700520 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800521
522 while (destlen) {
523 src = bounce_addr + bounce_sgl[j].offset;
524 srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
525
526 copylen = min(srclen, destlen);
527 memcpy((void *)dest, (void *)src, copylen);
528
529 total_copied += copylen;
530 bounce_sgl[j].offset += copylen;
531 destlen -= copylen;
532 dest += copylen;
533
534 if (bounce_sgl[j].offset == bounce_sgl[j].length) {
535 /* full */
Linus Torvalds9f393832012-03-21 09:40:26 -0700536 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800537 j++;
538
539 /*
540 * It is possible that the number of elements
541 * in the bounce buffer may not be equal to
542 * the number of elements in the original
543 * scatter list. Handle this correctly.
544 */
545
546 if (j == bounce_sgl_count) {
547 /*
548 * We are done; cleanup and return.
549 */
Linus Torvalds9f393832012-03-21 09:40:26 -0700550 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800551 local_irq_restore(flags);
552 return total_copied;
553 }
554
555 /* if we need to use another bounce buffer */
556 if (destlen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700557 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800558 } else if (destlen == 0 && i == orig_sgl_count - 1) {
559 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700560 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800561 }
562 }
563
Linus Torvalds9f393832012-03-21 09:40:26 -0700564 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800565 }
566
567 local_irq_restore(flags);
568
569 return total_copied;
570}
571
572/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
573static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
574 struct scatterlist *bounce_sgl,
575 unsigned int orig_sgl_count)
576{
577 int i;
578 int j = 0;
579 unsigned long src, dest;
580 unsigned int srclen, destlen, copylen;
581 unsigned int total_copied = 0;
582 unsigned long bounce_addr = 0;
583 unsigned long src_addr = 0;
584 unsigned long flags;
585
586 local_irq_save(flags);
587
588 for (i = 0; i < orig_sgl_count; i++) {
Linus Torvalds9f393832012-03-21 09:40:26 -0700589 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800590 src = src_addr;
591 srclen = orig_sgl[i].length;
592
593 if (bounce_addr == 0)
Linus Torvalds9f393832012-03-21 09:40:26 -0700594 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800595
596 while (srclen) {
597 /* assume bounce offset always == 0 */
598 dest = bounce_addr + bounce_sgl[j].length;
599 destlen = PAGE_SIZE - bounce_sgl[j].length;
600
601 copylen = min(srclen, destlen);
602 memcpy((void *)dest, (void *)src, copylen);
603
604 total_copied += copylen;
605 bounce_sgl[j].length += copylen;
606 srclen -= copylen;
607 src += copylen;
608
609 if (bounce_sgl[j].length == PAGE_SIZE) {
610 /* full..move to next entry */
Linus Torvalds9f393832012-03-21 09:40:26 -0700611 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800612 j++;
613
614 /* if we need to use another bounce buffer */
615 if (srclen || i != orig_sgl_count - 1)
Linus Torvalds9f393832012-03-21 09:40:26 -0700616 bounce_addr = sg_kmap_atomic(bounce_sgl,j);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800617
618 } else if (srclen == 0 && i == orig_sgl_count - 1) {
619 /* unmap the last bounce that is < PAGE_SIZE */
Linus Torvalds9f393832012-03-21 09:40:26 -0700620 sg_kunmap_atomic(bounce_addr);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800621 }
622 }
623
Linus Torvalds9f393832012-03-21 09:40:26 -0700624 sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800625 }
626
627 local_irq_restore(flags);
628
629 return total_copied;
630}
631
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700632static int storvsc_channel_init(struct hv_device *device)
633{
634 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800635 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700636 struct vstor_packet *vstor_packet;
637 int ret, t;
638
639 stor_device = get_out_stor_device(device);
640 if (!stor_device)
641 return -ENODEV;
642
643 request = &stor_device->init_request;
644 vstor_packet = &request->vstor_packet;
645
646 /*
647 * Now, initiate the vsc/vsp initialization protocol on the open
648 * channel
649 */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800650 memset(request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700651 init_completion(&request->wait_event);
652 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
653 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
654
655 ret = vmbus_sendpacket(device->channel, vstor_packet,
656 sizeof(struct vstor_packet),
657 (unsigned long)request,
658 VM_PKT_DATA_INBAND,
659 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
660 if (ret != 0)
661 goto cleanup;
662
663 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
664 if (t == 0) {
665 ret = -ETIMEDOUT;
666 goto cleanup;
667 }
668
669 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
670 vstor_packet->status != 0)
671 goto cleanup;
672
673
674 /* reuse the packet for version range supported */
675 memset(vstor_packet, 0, sizeof(struct vstor_packet));
676 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
677 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
678
K. Y. Srinivasan85904a52012-01-12 12:38:04 -0800679 vstor_packet->version.major_minor =
680 storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
681
682 /*
683 * The revision number is only used in Windows; set it to 0.
684 */
K. Y. Srinivasanc6491142012-01-12 12:38:03 -0800685 vstor_packet->version.revision = 0;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700686
687 ret = vmbus_sendpacket(device->channel, vstor_packet,
688 sizeof(struct vstor_packet),
689 (unsigned long)request,
690 VM_PKT_DATA_INBAND,
691 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
692 if (ret != 0)
693 goto cleanup;
694
695 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
696 if (t == 0) {
697 ret = -ETIMEDOUT;
698 goto cleanup;
699 }
700
701 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
702 vstor_packet->status != 0)
703 goto cleanup;
704
705
706 memset(vstor_packet, 0, sizeof(struct vstor_packet));
707 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
708 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
709 vstor_packet->storage_channel_properties.port_number =
710 stor_device->port_number;
711
712 ret = vmbus_sendpacket(device->channel, vstor_packet,
713 sizeof(struct vstor_packet),
714 (unsigned long)request,
715 VM_PKT_DATA_INBAND,
716 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
717
718 if (ret != 0)
719 goto cleanup;
720
721 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
722 if (t == 0) {
723 ret = -ETIMEDOUT;
724 goto cleanup;
725 }
726
727 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
728 vstor_packet->status != 0)
729 goto cleanup;
730
731 stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
732 stor_device->target_id
733 = vstor_packet->storage_channel_properties.target_id;
734
735 memset(vstor_packet, 0, sizeof(struct vstor_packet));
736 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
737 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
738
739 ret = vmbus_sendpacket(device->channel, vstor_packet,
740 sizeof(struct vstor_packet),
741 (unsigned long)request,
742 VM_PKT_DATA_INBAND,
743 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
744
745 if (ret != 0)
746 goto cleanup;
747
748 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
749 if (t == 0) {
750 ret = -ETIMEDOUT;
751 goto cleanup;
752 }
753
754 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
755 vstor_packet->status != 0)
756 goto cleanup;
757
758
759cleanup:
760 return ret;
761}
762
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800763
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800764static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800765{
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800766 struct scsi_cmnd *scmnd = cmd_request->cmd;
767 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
768 void (*scsi_done_fn)(struct scsi_cmnd *);
769 struct scsi_sense_hdr sense_hdr;
770 struct vmscsi_request *vm_srb;
771 struct storvsc_scan_work *wrk;
772 struct stor_mem_pools *memp = scmnd->device->hostdata;
773
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800774 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800775 if (cmd_request->bounce_sgl_count) {
776 if (vm_srb->data_in == READ_TYPE)
777 copy_from_bounce_buffer(scsi_sglist(scmnd),
778 cmd_request->bounce_sgl,
779 scsi_sg_count(scmnd),
780 cmd_request->bounce_sgl_count);
781 destroy_bounce_buffer(cmd_request->bounce_sgl,
782 cmd_request->bounce_sgl_count);
783 }
784
785 /*
786 * If there is an error; offline the device since all
787 * error recovery strategies would have already been
788 * deployed on the host side.
789 */
790 if (vm_srb->srb_status == SRB_STATUS_ERROR)
791 scmnd->result = DID_TARGET_FAILURE << 16;
792 else
793 scmnd->result = vm_srb->scsi_status;
794
795 /*
796 * If the LUN is invalid; remove the device.
797 */
798 if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) {
799 struct storvsc_device *stor_dev;
800 struct hv_device *dev = host_dev->dev;
801 struct Scsi_Host *host;
802
803 stor_dev = get_in_stor_device(dev);
804 host = stor_dev->host;
805
806 wrk = kmalloc(sizeof(struct storvsc_scan_work),
807 GFP_ATOMIC);
808 if (!wrk) {
809 scmnd->result = DID_TARGET_FAILURE << 16;
810 } else {
811 wrk->host = host;
812 wrk->lun = vm_srb->lun;
813 INIT_WORK(&wrk->work, storvsc_remove_lun);
814 schedule_work(&wrk->work);
815 }
816 }
817
818 if (scmnd->result) {
819 if (scsi_normalize_sense(scmnd->sense_buffer,
820 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
821 scsi_print_sense_hdr("storvsc", &sense_hdr);
822 }
823
824 scsi_set_resid(scmnd,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800825 cmd_request->data_buffer.len -
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800826 vm_srb->data_transfer_length);
827
828 scsi_done_fn = scmnd->scsi_done;
829
830 scmnd->host_scribble = NULL;
831 scmnd->scsi_done = NULL;
832
833 scsi_done_fn(scmnd);
834
835 mempool_free(cmd_request, memp->request_mempool);
836}
837
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700838static void storvsc_on_io_completion(struct hv_device *device,
839 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800840 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700841{
842 struct storvsc_device *stor_device;
843 struct vstor_packet *stor_pkt;
844
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -0700845 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700846 stor_pkt = &request->vstor_packet;
847
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -0700848 /*
849 * The current SCSI handling on the host side does
850 * not correctly handle:
851 * INQUIRY command with page code parameter set to 0x80
852 * MODE_SENSE command with cmd[2] == 0x1c
853 *
854 * Setup srb and scsi status so this won't be fatal.
855 * We do this so we can distinguish truly fatal failues
856 * (srb status == 0x4) and off-line the device in that case.
857 */
858
859 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
K. Y. Srinivasana8c18c52012-01-12 12:38:00 -0800860 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -0700861 vstor_packet->vm_srb.scsi_status = 0;
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800862 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
K. Y. Srinivasan4ed51a22011-08-27 11:31:26 -0700863 }
864
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700865
866 /* Copy over the status...etc */
867 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
868 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
869 stor_pkt->vm_srb.sense_info_length =
870 vstor_packet->vm_srb.sense_info_length;
871
872 if (vstor_packet->vm_srb.scsi_status != 0 ||
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800873 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -0600874 dev_warn(&device->device,
875 "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
876 stor_pkt->vm_srb.cdb[0],
877 vstor_packet->vm_srb.scsi_status,
878 vstor_packet->vm_srb.srb_status);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700879 }
880
881 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
882 /* CHECK_CONDITION */
K. Y. Srinivasan16046322012-01-12 12:37:57 -0800883 if (vstor_packet->vm_srb.srb_status &
884 SRB_STATUS_AUTOSENSE_VALID) {
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700885 /* autosense data available */
Greg Kroah-Hartmand181daa2011-10-11 09:20:31 -0600886 dev_warn(&device->device,
K. Y. Srinivasan41098f82011-10-14 21:31:57 -0700887 "stor pkt %p autosense data valid - len %d\n",
888 request,
889 vstor_packet->vm_srb.sense_info_length);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700890
891 memcpy(request->sense_buffer,
892 vstor_packet->vm_srb.sense_data,
893 vstor_packet->vm_srb.sense_info_length);
894
895 }
896 }
897
898 stor_pkt->vm_srb.data_transfer_length =
899 vstor_packet->vm_srb.data_transfer_length;
900
K. Y. Srinivasan27073882012-01-12 12:38:01 -0800901 storvsc_command_completion(request);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700902
903 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
904 stor_device->drain_notify)
905 wake_up(&stor_device->waiting_to_drain);
906
907
908}
909
910static void storvsc_on_receive(struct hv_device *device,
911 struct vstor_packet *vstor_packet,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800912 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700913{
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800914 struct storvsc_scan_work *work;
915 struct storvsc_device *stor_device;
916
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700917 switch (vstor_packet->operation) {
918 case VSTOR_OPERATION_COMPLETE_IO:
919 storvsc_on_io_completion(device, vstor_packet, request);
920 break;
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800921
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700922 case VSTOR_OPERATION_REMOVE_DEVICE:
K. Y. Srinivasan12675792011-11-08 09:01:49 -0800923 case VSTOR_OPERATION_ENUMERATE_BUS:
924 stor_device = get_in_stor_device(device);
925 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
926 if (!work)
927 return;
928
929 INIT_WORK(&work->work, storvsc_bus_scan);
930 work->host = stor_device->host;
931 schedule_work(&work->work);
932 break;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700933
934 default:
935 break;
936 }
937}
938
939static void storvsc_on_channel_callback(void *context)
940{
941 struct hv_device *device = (struct hv_device *)context;
942 struct storvsc_device *stor_device;
943 u32 bytes_recvd;
944 u64 request_id;
945 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800946 struct storvsc_cmd_request *request;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700947 int ret;
948
949
950 stor_device = get_in_stor_device(device);
951 if (!stor_device)
952 return;
953
954 do {
955 ret = vmbus_recvpacket(device->channel, packet,
956 ALIGN(sizeof(struct vstor_packet), 8),
957 &bytes_recvd, &request_id);
958 if (ret == 0 && bytes_recvd > 0) {
959
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -0800960 request = (struct storvsc_cmd_request *)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700961 (unsigned long)request_id;
962
963 if ((request == &stor_device->init_request) ||
964 (request == &stor_device->reset_request)) {
965
966 memcpy(&request->vstor_packet, packet,
967 sizeof(struct vstor_packet));
968 complete(&request->wait_event);
969 } else {
970 storvsc_on_receive(device,
971 (struct vstor_packet *)packet,
972 request);
973 }
974 } else {
975 break;
976 }
977 } while (1);
978
979 return;
980}
981
982static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
983{
984 struct vmstorage_channel_properties props;
985 int ret;
986
987 memset(&props, 0, sizeof(struct vmstorage_channel_properties));
988
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -0700989 ret = vmbus_open(device->channel,
990 ring_size,
991 ring_size,
992 (void *)&props,
993 sizeof(struct vmstorage_channel_properties),
994 storvsc_on_channel_callback, device);
995
996 if (ret != 0)
997 return ret;
998
999 ret = storvsc_channel_init(device);
1000
1001 return ret;
1002}
1003
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001004static int storvsc_dev_remove(struct hv_device *device)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001005{
1006 struct storvsc_device *stor_device;
1007 unsigned long flags;
1008
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001009 stor_device = hv_get_drvdata(device);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001010
1011 spin_lock_irqsave(&device->channel->inbound_lock, flags);
1012 stor_device->destroy = true;
1013 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1014
1015 /*
1016 * At this point, all outbound traffic should be disable. We
1017 * only allow inbound traffic (responses) to proceed so that
1018 * outstanding requests can be completed.
1019 */
1020
1021 storvsc_wait_to_drain(stor_device);
1022
1023 /*
1024 * Since we have already drained, we don't need to busy wait
1025 * as was done in final_release_stor_device()
1026 * Note that we cannot set the ext pointer to NULL until
1027 * we have drained - to drain the outgoing packets, we need to
1028 * allow incoming packets.
1029 */
1030 spin_lock_irqsave(&device->channel->inbound_lock, flags);
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001031 hv_set_drvdata(device, NULL);
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001032 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
1033
1034 /* Close the channel */
1035 vmbus_close(device->channel);
1036
1037 kfree(stor_device);
1038 return 0;
1039}
1040
K. Y. Srinivasanc1b3d062011-08-27 11:31:25 -07001041static int storvsc_do_io(struct hv_device *device,
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001042 struct storvsc_cmd_request *request)
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001043{
1044 struct storvsc_device *stor_device;
1045 struct vstor_packet *vstor_packet;
1046 int ret = 0;
1047
1048 vstor_packet = &request->vstor_packet;
1049 stor_device = get_out_stor_device(device);
1050
1051 if (!stor_device)
1052 return -ENODEV;
1053
1054
1055 request->device = device;
1056
1057
1058 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
1059
1060 vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
1061
1062
K. Y. Srinivasan6b2f9492012-01-12 12:38:05 -08001063 vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
K. Y. Srinivasan8dcf37d2011-08-27 11:31:22 -07001064
1065
1066 vstor_packet->vm_srb.data_transfer_length =
1067 request->data_buffer.len;
1068
1069 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
1070
1071 if (request->data_buffer.len) {
1072 ret = vmbus_sendpacket_multipagebuffer(device->channel,
1073 &request->data_buffer,
1074 vstor_packet,
1075 sizeof(struct vstor_packet),
1076 (unsigned long)request);
1077 } else {
1078 ret = vmbus_sendpacket(device->channel, vstor_packet,
1079 sizeof(struct vstor_packet),
1080 (unsigned long)request,
1081 VM_PKT_DATA_INBAND,
1082 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1083 }
1084
1085 if (ret != 0)
1086 return ret;
1087
1088 atomic_inc(&stor_device->num_outstanding_req);
1089
1090 return ret;
1091}
1092
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001093static int storvsc_device_alloc(struct scsi_device *sdevice)
1094{
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001095 struct stor_mem_pools *memp;
1096 int number = STORVSC_MIN_BUF_NR;
1097
1098 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
1099 if (!memp)
1100 return -ENOMEM;
1101
1102 memp->request_pool =
1103 kmem_cache_create(dev_name(&sdevice->sdev_dev),
1104 sizeof(struct storvsc_cmd_request), 0,
1105 SLAB_HWCACHE_ALIGN, NULL);
1106
1107 if (!memp->request_pool)
1108 goto err0;
1109
1110 memp->request_mempool = mempool_create(number, mempool_alloc_slab,
1111 mempool_free_slab,
1112 memp->request_pool);
1113
1114 if (!memp->request_mempool)
1115 goto err1;
1116
1117 sdevice->hostdata = memp;
1118
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001119 return 0;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001120
1121err1:
1122 kmem_cache_destroy(memp->request_pool);
1123
1124err0:
1125 kfree(memp);
1126 return -ENOMEM;
1127}
1128
1129static void storvsc_device_destroy(struct scsi_device *sdevice)
1130{
1131 struct stor_mem_pools *memp = sdevice->hostdata;
1132
1133 mempool_destroy(memp->request_mempool);
1134 kmem_cache_destroy(memp->request_pool);
1135 kfree(memp);
1136 sdevice->hostdata = NULL;
K. Y. Srinivasan5b60ace2011-05-10 07:54:25 -07001137}
1138
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001139static int storvsc_device_configure(struct scsi_device *sdevice)
1140{
1141 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
1142 STORVSC_MAX_IO_REQUESTS);
1143
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001144 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
1145
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001146 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
K. Y. Srinivasan419f2d02011-05-10 07:54:27 -07001147
1148 return 0;
1149}
1150
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001151static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
1152 sector_t capacity, int *info)
1153{
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001154 sector_t nsect = capacity;
1155 sector_t cylinders = nsect;
1156 int heads, sectors_pt;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001157
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001158 /*
1159 * We are making up these values; let us keep it simple.
1160 */
1161 heads = 0xff;
1162 sectors_pt = 0x3f; /* Sectors per track */
1163 sector_div(cylinders, heads * sectors_pt);
1164 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
1165 cylinders = 0xffff;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001166
1167 info[0] = heads;
K. Y. Srinivasan5326fd52011-05-10 07:54:52 -07001168 info[1] = sectors_pt;
1169 info[2] = (int)cylinders;
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001170
K. Y. Srinivasan62838ce2011-05-10 07:54:34 -07001171 return 0;
1172}
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001173
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001174static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001175{
K. Y. Srinivasan4b270c82012-01-12 12:37:58 -08001176 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
1177 struct hv_device *device = host_dev->dev;
1178
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001179 struct storvsc_device *stor_device;
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001180 struct storvsc_cmd_request *request;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001181 struct vstor_packet *vstor_packet;
1182 int ret, t;
1183
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001184
K. Y. Srinivasan1eaaddf2011-08-27 11:31:03 -07001185 stor_device = get_out_stor_device(device);
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001186 if (!stor_device)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001187 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001188
1189 request = &stor_device->reset_request;
1190 vstor_packet = &request->vstor_packet;
1191
1192 init_completion(&request->wait_event);
1193
1194 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
1195 vstor_packet->flags = REQUEST_COMPLETION_FLAG;
1196 vstor_packet->vm_srb.path_id = stor_device->path_id;
1197
1198 ret = vmbus_sendpacket(device->channel, vstor_packet,
1199 sizeof(struct vstor_packet),
1200 (unsigned long)&stor_device->reset_request,
1201 VM_PKT_DATA_INBAND,
1202 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1203 if (ret != 0)
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001204 return FAILED;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001205
K. Y. Srinivasan46d2eb62011-06-16 13:16:36 -07001206 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001207 if (t == 0)
1208 return TIMEOUT_ERROR;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001209
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001210
1211 /*
1212 * At this point, all outstanding requests in the adapter
1213 * should have been flushed out and return to us
1214 */
1215
K. Y. Srinivasana00e8222011-11-08 09:01:43 -08001216 return SUCCESS;
K. Y. Srinivasanaa3d7892011-05-10 07:54:37 -07001217}
1218
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001219static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001220{
1221 bool allowed = true;
1222 u8 scsi_op = scmnd->cmnd[0];
1223
1224 switch (scsi_op) {
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001225 /*
1226 * smartd sends this command and the host does not handle
1227 * this. So, don't send it.
1228 */
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001229 case SET_WINDOW:
K. Y. Srinivasan59e00e72011-11-08 09:01:42 -08001230 scmnd->result = ILLEGAL_REQUEST << 16;
K. Y. Srinivasan41098f82011-10-14 21:31:57 -07001231 allowed = false;
1232 break;
1233 default:
1234 break;
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001235 }
1236 return allowed;
1237}
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001238
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001239static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001240{
1241 int ret;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001242 struct hv_host_device *host_dev = shost_priv(host);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001243 struct hv_device *dev = host_dev->dev;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001244 struct storvsc_cmd_request *cmd_request;
1245 unsigned int request_size = 0;
1246 int i;
1247 struct scatterlist *sgl;
1248 unsigned int sg_count = 0;
1249 struct vmscsi_request *vm_srb;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001250 struct stor_mem_pools *memp = scmnd->device->hostdata;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001251
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001252 if (!storvsc_scsi_cmd_ok(scmnd)) {
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001253 scmnd->scsi_done(scmnd);
Olaf Hering92ae4eb2011-10-10 09:37:39 +02001254 return 0;
1255 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001256
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001257 request_size = sizeof(struct storvsc_cmd_request);
1258
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001259 cmd_request = mempool_alloc(memp->request_mempool,
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001260 GFP_ATOMIC);
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001261
1262 /*
1263 * We might be invoked in an interrupt context; hence
1264 * mempool_alloc() can fail.
1265 */
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001266 if (!cmd_request)
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001267 return SCSI_MLQUEUE_DEVICE_BUSY;
K. Y. Srinivasanbab445e2011-11-08 09:01:45 -08001268
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001269 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001270
1271 /* Setup the cmd request */
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001272 cmd_request->cmd = scmnd;
1273
1274 scmnd->host_scribble = (unsigned char *)cmd_request;
1275
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001276 vm_srb = &cmd_request->vstor_packet.vm_srb;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001277
1278
1279 /* Build the SRB */
1280 switch (scmnd->sc_data_direction) {
1281 case DMA_TO_DEVICE:
1282 vm_srb->data_in = WRITE_TYPE;
1283 break;
1284 case DMA_FROM_DEVICE:
1285 vm_srb->data_in = READ_TYPE;
1286 break;
1287 default:
1288 vm_srb->data_in = UNKNOWN_TYPE;
1289 break;
1290 }
1291
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001292
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001293 vm_srb->port_number = host_dev->port;
1294 vm_srb->path_id = scmnd->device->channel;
1295 vm_srb->target_id = scmnd->device->id;
1296 vm_srb->lun = scmnd->device->lun;
1297
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001298 vm_srb->cdb_length = scmnd->cmd_len;
1299
1300 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
1301
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001302 cmd_request->sense_buffer = scmnd->sense_buffer;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001303
1304
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001305 cmd_request->data_buffer.len = scsi_bufflen(scmnd);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001306 if (scsi_sg_count(scmnd)) {
1307 sgl = (struct scatterlist *)scsi_sglist(scmnd);
1308 sg_count = scsi_sg_count(scmnd);
1309
1310 /* check if we need to bounce the sgl */
1311 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
1312 cmd_request->bounce_sgl =
1313 create_bounce_buffer(sgl, scsi_sg_count(scmnd),
K. Y. Srinivasan6e8087a2011-12-07 07:15:52 -08001314 scsi_bufflen(scmnd),
1315 vm_srb->data_in);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001316 if (!cmd_request->bounce_sgl) {
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001317 ret = SCSI_MLQUEUE_HOST_BUSY;
1318 goto queue_error;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001319 }
1320
1321 cmd_request->bounce_sgl_count =
1322 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
1323 PAGE_SHIFT;
1324
K. Y. Srinivasanfa23b8c2011-08-27 11:31:21 -07001325 if (vm_srb->data_in == WRITE_TYPE)
1326 copy_to_bounce_buffer(sgl,
1327 cmd_request->bounce_sgl,
1328 scsi_sg_count(scmnd));
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001329
1330 sgl = cmd_request->bounce_sgl;
1331 sg_count = cmd_request->bounce_sgl_count;
1332 }
1333
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001334 cmd_request->data_buffer.offset = sgl[0].offset;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001335
1336 for (i = 0; i < sg_count; i++)
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001337 cmd_request->data_buffer.pfn_array[i] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001338 page_to_pfn(sg_page((&sgl[i])));
1339
1340 } else if (scsi_sglist(scmnd)) {
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001341 cmd_request->data_buffer.offset =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001342 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001343 cmd_request->data_buffer.pfn_array[0] =
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001344 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1345 }
1346
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001347 /* Invokes the vsc to start an IO */
K. Y. Srinivasan61eaffc2012-01-12 12:38:07 -08001348 ret = storvsc_do_io(dev, cmd_request);
K. Y. Srinivasan636f0fd2011-05-10 07:54:50 -07001349
K. Y. Srinivasand2598f02011-08-25 09:48:58 -07001350 if (ret == -EAGAIN) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001351 /* no more space */
1352
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001353 if (cmd_request->bounce_sgl_count) {
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001354 destroy_bounce_buffer(cmd_request->bounce_sgl,
K. Y. Srinivasan70691ec2011-08-27 11:31:29 -07001355 cmd_request->bounce_sgl_count);
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001356
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001357 ret = SCSI_MLQUEUE_DEVICE_BUSY;
1358 goto queue_error;
1359 }
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001360 }
1361
K. Y. Srinivasanc77b63b2012-01-12 12:37:56 -08001362 return 0;
1363
1364queue_error:
1365 mempool_free(cmd_request, memp->request_mempool);
1366 scmnd->host_scribble = NULL;
K. Y. Srinivasanc5b463a2011-05-10 07:54:42 -07001367 return ret;
1368}
1369
Hank Janssenbef4a342009-07-13 16:01:31 -07001370static struct scsi_host_template scsi_driver = {
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001371 .module = THIS_MODULE,
1372 .name = "storvsc_host_t",
1373 .bios_param = storvsc_get_chs,
1374 .queuecommand = storvsc_queuecommand,
1375 .eh_host_reset_handler = storvsc_host_reset_handler,
1376 .slave_alloc = storvsc_device_alloc,
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001377 .slave_destroy = storvsc_device_destroy,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001378 .slave_configure = storvsc_device_configure,
1379 .cmd_per_lun = 1,
1380 /* 64 max_queue * 1 target */
Lars Lindley0686e4f2010-03-11 23:51:23 +01001381 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001382 .this_id = -1,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001383 /* no use setting to 0 since ll_blk_rw reset it to 1 */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001384 /* currently 32 */
1385 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
K. Y. Srinivasan039db522011-12-01 04:59:16 -08001386 .use_clustering = DISABLE_CLUSTERING,
Bill Pemberton454f18a2009-07-27 16:47:24 -04001387 /* Make sure we dont get a sg segment crosses a page boundary */
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001388 .dma_boundary = PAGE_SIZE-1,
Hank Janssenbef4a342009-07-13 16:01:31 -07001389};
1390
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001391enum {
1392 SCSI_GUID,
1393 IDE_GUID,
1394};
1395
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001396static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001397 /* SCSI guid */
1398 { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001399 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1400 .driver_data = SCSI_GUID },
K. Y. Srinivasan21e37742011-08-27 11:31:18 -07001401 /* IDE guid */
1402 { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001403 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1404 .driver_data = IDE_GUID },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -07001405 { },
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001406};
Hank Janssenbef4a342009-07-13 16:01:31 -07001407
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001408MODULE_DEVICE_TABLE(vmbus, id_table);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001409
K. Y. Srinivasan84946892011-09-13 10:59:38 -07001410static int storvsc_probe(struct hv_device *device,
1411 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001412{
1413 int ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001414 struct Scsi_Host *host;
1415 struct hv_host_device *host_dev;
K. Y. Srinivasanef52a812011-09-13 10:59:39 -07001416 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001417 int target = 0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001418 struct storvsc_device *stor_device;
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001419
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001420 host = scsi_host_alloc(&scsi_driver,
1421 sizeof(struct hv_host_device));
1422 if (!host)
1423 return -ENOMEM;
1424
K. Y. Srinivasan7f33f302011-11-08 09:01:44 -08001425 host_dev = shost_priv(host);
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001426 memset(host_dev, 0, sizeof(struct hv_host_device));
1427
1428 host_dev->port = host->host_no;
1429 host_dev->dev = device;
1430
K. Y. Srinivasan4e03e692011-11-08 09:01:40 -08001431
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001432 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001433 if (!stor_device) {
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001434 ret = -ENOMEM;
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001435 goto err_out0;
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001436 }
1437
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001438 stor_device->destroy = false;
1439 init_waitqueue_head(&stor_device->waiting_to_drain);
1440 stor_device->device = device;
K. Y. Srinivasancd654ea2011-09-13 10:59:48 -07001441 stor_device->host = host;
1442 hv_set_drvdata(device, stor_device);
K. Y. Srinivasana13d35a2011-09-13 10:59:46 -07001443
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001444 stor_device->port_number = host->host_no;
1445 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001446 if (ret)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001447 goto err_out1;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001448
K. Y. Srinivasan6e4198c2011-09-13 10:59:45 -07001449 host_dev->path = stor_device->path_id;
1450 host_dev->target = stor_device->target_id;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001451
1452 /* max # of devices per target */
1453 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
1454 /* max # of targets per channel */
1455 host->max_id = STORVSC_MAX_TARGETS;
1456 /* max # of channels */
1457 host->max_channel = STORVSC_MAX_CHANNELS - 1;
Mike Sterlingcf55f4a2011-09-06 16:10:55 -07001458 /* max cmd length */
1459 host->max_cmd_len = STORVSC_MAX_CMD_LEN;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001460
1461 /* Register the HBA and start the scsi bus scan */
1462 ret = scsi_add_host(host, &device->device);
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001463 if (ret != 0)
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001464 goto err_out2;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001465
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001466 if (!dev_is_ide) {
1467 scsi_scan_host(host);
K. Y. Srinivasan59d22952012-01-12 12:37:55 -08001468 } else {
1469 target = (device->dev_instance.b[5] << 8 |
1470 device->dev_instance.b[4]);
1471 ret = scsi_add_device(host, 0, target, 0);
1472 if (ret) {
1473 scsi_remove_host(host);
1474 goto err_out2;
1475 }
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001476 }
1477 return 0;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001478
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001479err_out2:
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001480 /*
1481 * Once we have connected with the host, we would need to
1482 * to invoke storvsc_dev_remove() to rollback this state and
1483 * this call also frees up the stor_device; hence the jump around
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001484 * err_out1 label.
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001485 */
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001486 storvsc_dev_remove(device);
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001487 goto err_out0;
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001488
1489err_out1:
K. Y. Srinivasance3e3012011-12-01 04:59:20 -08001490 kfree(stor_device);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001491
1492err_out0:
K. Y. Srinivasanbd1f5d62011-08-27 11:31:17 -07001493 scsi_host_put(host);
K. Y. Srinivasan225ce6e2011-11-08 09:01:41 -08001494 return ret;
K. Y. Srinivasanf5c78872011-05-10 07:54:43 -07001495}
1496
K. Y. Srinivasanddcbf652012-01-12 12:37:59 -08001497static int storvsc_remove(struct hv_device *dev)
1498{
1499 struct storvsc_device *stor_device = hv_get_drvdata(dev);
1500 struct Scsi_Host *host = stor_device->host;
1501
1502 scsi_remove_host(host);
1503 storvsc_dev_remove(dev);
1504 scsi_host_put(host);
1505
1506 return 0;
1507}
1508
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001509static struct hv_driver storvsc_drv = {
K. Y. Srinivasanfafb0ef2011-11-08 09:01:46 -08001510 .name = KBUILD_MODNAME,
K. Y. Srinivasand847b5f2011-08-25 09:48:33 -07001511 .id_table = id_table,
K. Y. Srinivasan40bf63e2011-05-10 07:56:09 -07001512 .probe = storvsc_probe,
1513 .remove = storvsc_remove,
K. Y. Srinivasan39ae6fa2011-05-10 07:54:46 -07001514};
K. Y. Srinivasan7bd05b92011-05-10 07:54:45 -07001515
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001516static int __init storvsc_drv_init(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001517{
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001518 u32 max_outstanding_req_per_channel;
1519
1520 /*
1521 * Divide the ring buffer data size (which is 1 page less
1522 * than the ring buffer size since that page is reserved for
1523 * the ring buffer indices) by the max request size (which is
1524 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
1525 */
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001526 max_outstanding_req_per_channel =
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001527 ((storvsc_ringbuffer_size - PAGE_SIZE) /
1528 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
1529 sizeof(struct vstor_packet) + sizeof(u64),
1530 sizeof(u64)));
Hank Janssenbef4a342009-07-13 16:01:31 -07001531
K. Y. Srinivasan01415ab32011-05-10 07:55:58 -07001532 if (max_outstanding_req_per_channel <
K. Y. Srinivasanf8feed02011-05-10 07:54:24 -07001533 STORVSC_MAX_IO_REQUESTS)
K. Y. Srinivasanb06efc12011-08-25 09:49:10 -07001534 return -EINVAL;
Hank Janssenbef4a342009-07-13 16:01:31 -07001535
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001536 return vmbus_driver_register(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001537}
1538
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001539static void __exit storvsc_drv_exit(void)
Hank Janssenbef4a342009-07-13 16:01:31 -07001540{
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -07001541 vmbus_driver_unregister(&storvsc_drv);
Hank Janssenbef4a342009-07-13 16:01:31 -07001542}
1543
Greg Kroah-Hartmanff568d32009-09-02 08:37:47 -07001544MODULE_LICENSE("GPL");
Hank Janssen26c14cc2010-02-11 23:02:42 +00001545MODULE_VERSION(HV_DRV_VERSION);
Stephen Hemminger3afc7cc32010-05-06 21:44:45 -07001546MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
K. Y. Srinivasand9bbae82011-06-06 15:49:27 -07001547module_init(storvsc_drv_init);
K. Y. Srinivasanc63ba9e2011-06-06 15:49:26 -07001548module_exit(storvsc_drv_exit);