Commit | Line | Data |
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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * 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> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
bef4a34a | 22 | #include <linux/init.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
bef4a34a HJ |
24 | #include <linux/module.h> |
25 | #include <linux/device.h> | |
26 | #include <linux/blkdev.h> | |
bef4a34a HJ |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_cmnd.h> | |
29 | #include <scsi/scsi_host.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_tcq.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 34 | #include <scsi/scsi_dbg.h> |
e3fe0bb6 | 35 | #include "hv_api.h" |
645954c5 | 36 | #include "logging.h" |
2d82f6c7 | 37 | #include "version_info.h" |
870cde80 | 38 | #include "vmbus.h" |
bb969793 | 39 | #include "storvsc_api.h" |
af3043c6 S |
40 | #include "vstorage.h" |
41 | #include "channel.h" | |
bef4a34a | 42 | |
bef4a34a | 43 | |
0f0cdc6a | 44 | static const char *driver_name = "storvsc"; |
6dec2442 S |
45 | |
46 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ | |
47 | static const struct hv_guid gStorVscDeviceType = { | |
48 | .data = { | |
49 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
50 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
51 | } | |
52 | }; | |
53 | ||
972621c9 | 54 | struct hv_host_device { |
97c15296 | 55 | struct hv_device *dev; |
ff568d3a GKH |
56 | struct kmem_cache *request_pool; |
57 | unsigned int port; | |
58 | unsigned char path; | |
59 | unsigned char target; | |
bef4a34a HJ |
60 | }; |
61 | ||
62 | struct storvsc_cmd_request { | |
ff568d3a GKH |
63 | struct list_head entry; |
64 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
65 | |
66 | unsigned int bounce_sgl_count; | |
ff568d3a | 67 | struct scatterlist *bounce_sgl; |
bef4a34a | 68 | |
0b3f6834 | 69 | struct hv_storvsc_request request; |
bef4a34a HJ |
70 | }; |
71 | ||
bef4a34a | 72 | |
6dec2442 S |
73 | /* |
74 | * stor_vsc_initialize - Main entry point | |
75 | */ | |
2b8b3582 | 76 | static int stor_vsc_initialize(struct hv_driver *driver) |
6dec2442 | 77 | { |
2e79505d | 78 | struct storvsc_driver *stor_driver; |
6dec2442 | 79 | |
ced01b0d | 80 | stor_driver = hvdr_to_stordr(driver); |
6dec2442 | 81 | |
d7a1bdb9 S |
82 | DPRINT_DBG(STORVSC, |
83 | "sizeof(struct hv_storvsc_request)=%zd " | |
6dec2442 S |
84 | "sizeof(struct vstor_packet)=%zd, " |
85 | "sizeof(struct vmscsi_request)=%zd", | |
86 | sizeof(struct hv_storvsc_request), | |
6dec2442 S |
87 | sizeof(struct vstor_packet), |
88 | sizeof(struct vmscsi_request)); | |
89 | ||
90 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
91 | ||
0f0cdc6a | 92 | driver->name = driver_name; |
6dec2442 S |
93 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
94 | sizeof(struct hv_guid)); | |
95 | ||
6dec2442 S |
96 | |
97 | /* | |
98 | * Divide the ring buffer data size (which is 1 page less | |
99 | * than the ring buffer size since that page is reserved for | |
100 | * the ring buffer indices) by the max request size (which is | |
101 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
102 | */ | |
103 | stor_driver->max_outstanding_req_per_channel = | |
104 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
105 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
106 | sizeof(struct vstor_packet) + sizeof(u64), | |
107 | sizeof(u64))); | |
108 | ||
109 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
110 | stor_driver->max_outstanding_req_per_channel, | |
111 | STORVSC_MAX_IO_REQUESTS); | |
112 | ||
113 | /* Setup the dispatch table */ | |
2ac5dad1 | 114 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 115 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 116 | |
bb465926 | 117 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
118 | |
119 | return 0; | |
120 | } | |
121 | ||
454f18a9 | 122 | /* Static decl */ |
9efd21e1 | 123 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 124 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a HJ |
125 | static int storvsc_device_alloc(struct scsi_device *); |
126 | static int storvsc_device_configure(struct scsi_device *); | |
127 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
415b023a | 128 | static int storvsc_remove(struct hv_device *dev); |
bef4a34a | 129 | |
ff568d3a GKH |
130 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
131 | unsigned int sg_count, | |
132 | unsigned int len); | |
133 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
134 | unsigned int sg_count); | |
bef4a34a | 135 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
136 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
137 | struct scatterlist *bounce_sgl, | |
138 | unsigned int orig_sgl_count); | |
139 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
140 | struct scatterlist *bounce_sgl, | |
141 | unsigned int orig_sgl_count); | |
bef4a34a | 142 | |
ff568d3a GKH |
143 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
144 | sector_t capacity, int *info); | |
bef4a34a HJ |
145 | |
146 | ||
147 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
148 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
149 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 150 | |
454f18a9 | 151 | /* The one and only one */ |
2e79505d | 152 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 153 | |
454f18a9 | 154 | /* Scsi driver */ |
bef4a34a | 155 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
156 | .module = THIS_MODULE, |
157 | .name = "storvsc_host_t", | |
158 | .bios_param = storvsc_get_chs, | |
159 | .queuecommand = storvsc_queuecommand, | |
160 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
161 | .slave_alloc = storvsc_device_alloc, | |
162 | .slave_configure = storvsc_device_configure, | |
163 | .cmd_per_lun = 1, | |
164 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 165 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 166 | .this_id = -1, |
454f18a9 | 167 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
168 | /* currently 32 */ |
169 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
170 | /* | |
171 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
172 | * into 1 sg element. If set, we must limit the max_segment_size to | |
173 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
174 | * multiple | |
175 | */ | |
454f18a9 | 176 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 177 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 178 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 179 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
180 | }; |
181 | ||
182 | ||
3e189519 | 183 | /* |
ff568d3a GKH |
184 | * storvsc_drv_init - StorVsc driver initialization. |
185 | */ | |
db085777 | 186 | static int storvsc_drv_init(void) |
bef4a34a | 187 | { |
ff568d3a | 188 | int ret; |
2e79505d | 189 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 190 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 191 | |
8a046024 | 192 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 193 | |
454f18a9 | 194 | /* Callback to client driver to complete the initialization */ |
db085777 | 195 | stor_vsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 196 | |
ff568d3a | 197 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 198 | "max outstanding reqs %u", |
8a046024 | 199 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 200 | |
8a046024 | 201 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
ff568d3a GKH |
202 | STORVSC_MAX_IO_REQUESTS) { |
203 | DPRINT_ERR(STORVSC_DRV, | |
204 | "The number of outstanding io requests (%d) " | |
205 | "is larger than that supported (%d) internally.", | |
206 | STORVSC_MAX_IO_REQUESTS, | |
8a046024 | 207 | storvsc_drv_obj->max_outstanding_req_per_channel); |
bef4a34a HJ |
208 | return -1; |
209 | } | |
210 | ||
150f9398 | 211 | drv->driver.name = storvsc_drv_obj->base.name; |
bef4a34a | 212 | |
9efd21e1 | 213 | drv->probe = storvsc_probe; |
415b023a | 214 | drv->remove = storvsc_remove; |
bef4a34a | 215 | |
454f18a9 | 216 | /* The driver belongs to vmbus */ |
150f9398 | 217 | ret = vmbus_child_driver_register(&drv->driver); |
bef4a34a | 218 | |
bef4a34a HJ |
219 | return ret; |
220 | } | |
221 | ||
af3043c6 | 222 | |
12cb12ef | 223 | static int stor_vsc_on_host_reset(struct hv_device *device) |
af3043c6 S |
224 | { |
225 | struct storvsc_device *stor_device; | |
d7a1bdb9 | 226 | struct hv_storvsc_request *request; |
af3043c6 | 227 | struct vstor_packet *vstor_packet; |
93958465 | 228 | int ret, t; |
af3043c6 S |
229 | |
230 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
231 | ||
232 | stor_device = get_stor_device(device); | |
233 | if (!stor_device) { | |
234 | DPRINT_ERR(STORVSC, "unable to get stor device..." | |
235 | "device being destroyed?"); | |
236 | return -1; | |
237 | } | |
238 | ||
239 | request = &stor_device->reset_request; | |
240 | vstor_packet = &request->vstor_packet; | |
241 | ||
93958465 | 242 | init_completion(&request->wait_event); |
af3043c6 S |
243 | |
244 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
245 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
246 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
247 | ||
af3043c6 S |
248 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
249 | sizeof(struct vstor_packet), | |
250 | (unsigned long)&stor_device->reset_request, | |
251 | VM_PKT_DATA_INBAND, | |
252 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
253 | if (ret != 0) { | |
254 | DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", | |
255 | vstor_packet, ret); | |
256 | goto cleanup; | |
257 | } | |
258 | ||
93958465 S |
259 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
260 | if (t == 0) { | |
af3043c6 S |
261 | ret = -ETIMEDOUT; |
262 | goto cleanup; | |
263 | } | |
264 | ||
265 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
266 | ||
267 | /* | |
268 | * At this point, all outstanding requests in the adapter | |
269 | * should have been flushed out and return to us | |
270 | */ | |
271 | ||
272 | cleanup: | |
273 | put_stor_device(device); | |
274 | return ret; | |
275 | } | |
276 | ||
bef4a34a HJ |
277 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
278 | { | |
279 | struct device **curr = (struct device **)data; | |
280 | *curr = dev; | |
454f18a9 | 281 | return 1; /* stop iterating */ |
bef4a34a HJ |
282 | } |
283 | ||
bd1de709 | 284 | static void storvsc_drv_exit(void) |
bef4a34a | 285 | { |
2e79505d | 286 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 287 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 288 | struct device *current_dev = NULL; |
2295ba2e | 289 | int ret; |
bef4a34a | 290 | |
ff568d3a | 291 | while (1) { |
bef4a34a HJ |
292 | current_dev = NULL; |
293 | ||
454f18a9 | 294 | /* Get the device */ |
150f9398 | 295 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
296 | (void *) ¤t_dev, |
297 | storvsc_drv_exit_cb); | |
298 | ||
299 | if (ret) | |
300 | DPRINT_WARN(STORVSC_DRV, | |
301 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
302 | |
303 | if (current_dev == NULL) | |
304 | break; | |
305 | ||
454f18a9 | 306 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
307 | device_unregister(current_dev); |
308 | } | |
309 | ||
ca623ad3 HZ |
310 | if (storvsc_drv_obj->base.cleanup) |
311 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 312 | |
150f9398 | 313 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
314 | return; |
315 | } | |
316 | ||
3e189519 | 317 | /* |
ff568d3a GKH |
318 | * storvsc_probe - Add a new device for this driver |
319 | */ | |
9efd21e1 | 320 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 321 | { |
ff568d3a | 322 | int ret; |
2e79505d | 323 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 324 | drv_to_stordrv(device->device.driver); |
bef4a34a | 325 | struct Scsi_Host *host; |
795b613d | 326 | struct hv_host_device *host_dev; |
9f0c7d2c | 327 | struct storvsc_device_info device_info; |
bef4a34a | 328 | |
ca623ad3 | 329 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
330 | return -1; |
331 | ||
ff568d3a | 332 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 333 | sizeof(struct hv_host_device)); |
ff568d3a | 334 | if (!host) { |
bef4a34a HJ |
335 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
336 | return -ENOMEM; | |
337 | } | |
338 | ||
9efd21e1 | 339 | dev_set_drvdata(&device->device, host); |
bef4a34a | 340 | |
795b613d S |
341 | host_dev = (struct hv_host_device *)host->hostdata; |
342 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 343 | |
795b613d | 344 | host_dev->port = host->host_no; |
97c15296 | 345 | host_dev->dev = device; |
bef4a34a | 346 | |
795b613d | 347 | host_dev->request_pool = |
9efd21e1 | 348 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 349 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
350 | SLAB_HWCACHE_ALIGN, NULL); |
351 | ||
795b613d | 352 | if (!host_dev->request_pool) { |
bef4a34a | 353 | scsi_host_put(host); |
bef4a34a HJ |
354 | return -ENOMEM; |
355 | } | |
356 | ||
8a046024 | 357 | device_info.port_number = host->host_no; |
454f18a9 | 358 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
359 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
360 | ||
ff568d3a | 361 | if (ret != 0) { |
bef4a34a | 362 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
795b613d | 363 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 364 | scsi_host_put(host); |
bef4a34a HJ |
365 | return -1; |
366 | } | |
367 | ||
795b613d S |
368 | host_dev->path = device_info.path_id; |
369 | host_dev->target = device_info.target_id; | |
bef4a34a | 370 | |
ff568d3a GKH |
371 | /* max # of devices per target */ |
372 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
373 | /* max # of targets per channel */ | |
374 | host->max_id = STORVSC_MAX_TARGETS; | |
375 | /* max # of channels */ | |
376 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 377 | |
454f18a9 | 378 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 379 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 380 | if (ret != 0) { |
bef4a34a HJ |
381 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
382 | ||
9efd21e1 | 383 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a | 384 | |
795b613d | 385 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 386 | scsi_host_put(host); |
bef4a34a HJ |
387 | return -1; |
388 | } | |
389 | ||
390 | scsi_scan_host(host); | |
bef4a34a HJ |
391 | return ret; |
392 | } | |
393 | ||
3e189519 | 394 | /* |
ff568d3a GKH |
395 | * storvsc_remove - Callback when our device is removed |
396 | */ | |
415b023a | 397 | static int storvsc_remove(struct hv_device *dev) |
bef4a34a | 398 | { |
2e79505d | 399 | struct storvsc_driver *storvsc_drv_obj = |
415b023a S |
400 | drv_to_stordrv(dev->device.driver); |
401 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
795b613d | 402 | struct hv_host_device *host_dev = |
972621c9 | 403 | (struct hv_host_device *)host->hostdata; |
bef4a34a | 404 | |
ff568d3a GKH |
405 | /* |
406 | * Call to the vsc driver to let it know that the device is being | |
407 | * removed | |
408 | */ | |
415b023a | 409 | storvsc_drv_obj->base.dev_rm(dev); |
bef4a34a | 410 | |
795b613d S |
411 | if (host_dev->request_pool) { |
412 | kmem_cache_destroy(host_dev->request_pool); | |
413 | host_dev->request_pool = NULL; | |
bef4a34a HJ |
414 | } |
415 | ||
416 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
417 | scsi_remove_host(host); | |
418 | ||
419 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
420 | scsi_host_put(host); | |
1c8d0b7d | 421 | return 0; |
bef4a34a HJ |
422 | } |
423 | ||
3e189519 | 424 | /* |
ff568d3a GKH |
425 | * storvsc_commmand_completion - Command completion processing |
426 | */ | |
0b3f6834 | 427 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 428 | { |
ff568d3a | 429 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 430 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 431 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
795b613d | 432 | struct hv_host_device *host_dev = |
972621c9 | 433 | (struct hv_host_device *)scmnd->device->host->hostdata; |
bef4a34a | 434 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 435 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 436 | struct vmscsi_request *vm_srb; |
bef4a34a | 437 | |
b856e738 BP |
438 | /* ASSERT(request == &cmd_request->request); */ |
439 | /* ASSERT(scmnd); */ | |
440 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
441 | /* (unsigned long)cmd_request); */ | |
442 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 443 | |
ff568d3a GKH |
444 | if (cmd_request->bounce_sgl_count) { |
445 | /* using bounce buffer */ | |
454f18a9 | 446 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 447 | |
454f18a9 | 448 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
449 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
450 | cmd_request->bounce_sgl, | |
451 | scsi_sg_count(scmnd)); | |
452 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
453 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
454 | } |
455 | ||
d7a1bdb9 | 456 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 457 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 458 | |
ff568d3a GKH |
459 | if (scmnd->result) { |
460 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 461 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 462 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
463 | } |
464 | ||
8a046024 HJ |
465 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
466 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 467 | request->data_buffer.len - |
e9e936c6 | 468 | vm_srb->data_transfer_length); |
bef4a34a HJ |
469 | |
470 | scsi_done_fn = scmnd->scsi_done; | |
471 | ||
472 | scmnd->host_scribble = NULL; | |
473 | scmnd->scsi_done = NULL; | |
474 | ||
454f18a9 | 475 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
476 | scsi_done_fn(scmnd); |
477 | ||
795b613d | 478 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
479 | } |
480 | ||
481 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
482 | { | |
ff568d3a | 483 | int i; |
bef4a34a | 484 | |
454f18a9 | 485 | /* No need to check */ |
bef4a34a HJ |
486 | if (sg_count < 2) |
487 | return -1; | |
488 | ||
454f18a9 | 489 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
490 | for (i = 0; i < sg_count; i++) { |
491 | if (i == 0) { | |
492 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
493 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
494 | return i; | |
ff568d3a GKH |
495 | } else if (i == sg_count - 1) { |
496 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
497 | if (sgl[i].offset != 0) |
498 | return i; | |
ff568d3a GKH |
499 | } else { |
500 | /* make sure no hole in the middle */ | |
bef4a34a | 501 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 502 | return i; |
bef4a34a HJ |
503 | } |
504 | } | |
505 | return -1; | |
506 | } | |
507 | ||
ff568d3a GKH |
508 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
509 | unsigned int sg_count, | |
510 | unsigned int len) | |
bef4a34a HJ |
511 | { |
512 | int i; | |
ff568d3a GKH |
513 | int num_pages; |
514 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
515 | struct page *page_buf; |
516 | ||
73509681 | 517 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 518 | |
06da0bc8 | 519 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 520 | if (!bounce_sgl) |
bef4a34a | 521 | return NULL; |
bef4a34a | 522 | |
ff568d3a | 523 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
524 | page_buf = alloc_page(GFP_ATOMIC); |
525 | if (!page_buf) | |
bef4a34a | 526 | goto cleanup; |
bef4a34a | 527 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
528 | } |
529 | ||
530 | return bounce_sgl; | |
531 | ||
532 | cleanup: | |
533 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
534 | return NULL; | |
535 | } | |
536 | ||
ff568d3a GKH |
537 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
538 | unsigned int sg_count) | |
bef4a34a HJ |
539 | { |
540 | int i; | |
541 | struct page *page_buf; | |
542 | ||
ff568d3a GKH |
543 | for (i = 0; i < sg_count; i++) { |
544 | page_buf = sg_page((&sgl[i])); | |
545 | if (page_buf != NULL) | |
bef4a34a | 546 | __free_page(page_buf); |
bef4a34a HJ |
547 | } |
548 | ||
549 | kfree(sgl); | |
550 | } | |
551 | ||
454f18a9 | 552 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
553 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
554 | struct scatterlist *bounce_sgl, | |
555 | unsigned int orig_sgl_count) | |
bef4a34a | 556 | { |
ff568d3a GKH |
557 | int i; |
558 | int j = 0; | |
bef4a34a HJ |
559 | unsigned long src, dest; |
560 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
561 | unsigned int total_copied = 0; |
562 | unsigned long bounce_addr = 0; | |
563 | unsigned long src_addr = 0; | |
bef4a34a HJ |
564 | unsigned long flags; |
565 | ||
566 | local_irq_save(flags); | |
567 | ||
ff568d3a GKH |
568 | for (i = 0; i < orig_sgl_count; i++) { |
569 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
570 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
571 | src = src_addr; |
572 | srclen = orig_sgl[i].length; | |
573 | ||
b856e738 | 574 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 575 | |
0c47a70a | 576 | if (bounce_addr == 0) |
bef4a34a | 577 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 578 | |
ff568d3a | 579 | while (srclen) { |
454f18a9 | 580 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
581 | dest = bounce_addr + bounce_sgl[j].length; |
582 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
583 | ||
fc6a4b26 | 584 | copylen = min(srclen, destlen); |
ff568d3a | 585 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
586 | |
587 | total_copied += copylen; | |
588 | bounce_sgl[j].length += copylen; | |
589 | srclen -= copylen; | |
590 | src += copylen; | |
591 | ||
ff568d3a GKH |
592 | if (bounce_sgl[j].length == PAGE_SIZE) { |
593 | /* full..move to next entry */ | |
594 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
595 | j++; |
596 | ||
454f18a9 | 597 | /* if we need to use another bounce buffer */ |
ff568d3a | 598 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 599 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
600 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
601 | /* unmap the last bounce that is < PAGE_SIZE */ | |
602 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
603 | } |
604 | } | |
605 | ||
ff568d3a | 606 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
607 | } |
608 | ||
609 | local_irq_restore(flags); | |
610 | ||
611 | return total_copied; | |
612 | } | |
613 | ||
454f18a9 | 614 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
615 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
616 | struct scatterlist *bounce_sgl, | |
617 | unsigned int orig_sgl_count) | |
bef4a34a | 618 | { |
ff568d3a GKH |
619 | int i; |
620 | int j = 0; | |
bef4a34a HJ |
621 | unsigned long src, dest; |
622 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
623 | unsigned int total_copied = 0; |
624 | unsigned long bounce_addr = 0; | |
625 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
626 | unsigned long flags; |
627 | ||
628 | local_irq_save(flags); | |
629 | ||
ff568d3a GKH |
630 | for (i = 0; i < orig_sgl_count; i++) { |
631 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
632 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
633 | dest = dest_addr; |
634 | destlen = orig_sgl[i].length; | |
b856e738 | 635 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 636 | |
0c47a70a | 637 | if (bounce_addr == 0) |
bef4a34a | 638 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 639 | |
ff568d3a | 640 | while (destlen) { |
bef4a34a HJ |
641 | src = bounce_addr + bounce_sgl[j].offset; |
642 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
643 | ||
fc6a4b26 | 644 | copylen = min(srclen, destlen); |
ff568d3a | 645 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
646 | |
647 | total_copied += copylen; | |
648 | bounce_sgl[j].offset += copylen; | |
649 | destlen -= copylen; | |
650 | dest += copylen; | |
651 | ||
ff568d3a GKH |
652 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
653 | /* full */ | |
654 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
655 | j++; |
656 | ||
454f18a9 | 657 | /* if we need to use another bounce buffer */ |
ff568d3a | 658 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 659 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
660 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
661 | /* unmap the last bounce that is < PAGE_SIZE */ | |
662 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
663 | } |
664 | } | |
665 | ||
ff568d3a GKH |
666 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
667 | KM_IRQ0); | |
bef4a34a HJ |
668 | } |
669 | ||
670 | local_irq_restore(flags); | |
671 | ||
672 | return total_copied; | |
673 | } | |
674 | ||
3e189519 | 675 | /* |
ff568d3a GKH |
676 | * storvsc_queuecommand - Initiate command processing |
677 | */ | |
f281233d | 678 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 679 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 680 | { |
ff568d3a | 681 | int ret; |
795b613d | 682 | struct hv_host_device *host_dev = |
972621c9 | 683 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 684 | struct hv_device *dev = host_dev->dev; |
2e79505d | 685 | struct storvsc_driver *storvsc_drv_obj = |
c2ad4830 | 686 | drv_to_stordrv(dev->device.driver); |
0b3f6834 | 687 | struct hv_storvsc_request *request; |
bef4a34a | 688 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 689 | unsigned int request_size = 0; |
bef4a34a HJ |
690 | int i; |
691 | struct scatterlist *sgl; | |
77c5ceaf | 692 | unsigned int sg_count = 0; |
12fbd416 | 693 | struct vmscsi_request *vm_srb; |
bef4a34a | 694 | |
ff568d3a GKH |
695 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
696 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
697 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
698 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
699 | scmnd->device->tagged_supported); | |
bef4a34a | 700 | |
454f18a9 | 701 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 702 | if (scmnd->host_scribble) { |
b856e738 | 703 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 704 | |
ff568d3a GKH |
705 | cmd_request = |
706 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
707 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
708 | scmnd, cmd_request); | |
bef4a34a HJ |
709 | |
710 | goto retry_request; | |
711 | } | |
712 | ||
b856e738 BP |
713 | /* ASSERT(scmnd->scsi_done == NULL); */ |
714 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
715 | |
716 | scmnd->scsi_done = done; | |
717 | ||
718 | request_size = sizeof(struct storvsc_cmd_request); | |
719 | ||
795b613d | 720 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
ff568d3a GKH |
721 | GFP_ATOMIC); |
722 | if (!cmd_request) { | |
723 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
724 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
725 | scmnd->scsi_done = NULL; |
726 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
727 | } | |
728 | ||
454f18a9 | 729 | /* Setup the cmd request */ |
bef4a34a HJ |
730 | cmd_request->bounce_sgl_count = 0; |
731 | cmd_request->bounce_sgl = NULL; | |
732 | cmd_request->cmd = scmnd; | |
733 | ||
ff568d3a | 734 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
735 | |
736 | request = &cmd_request->request; | |
d7a1bdb9 | 737 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 738 | |
1e05d88e | 739 | DPRINT_DBG(STORVSC_DRV, "req %p size %d", request, request_size); |
bef4a34a | 740 | |
454f18a9 | 741 | /* Build the SRB */ |
ff568d3a | 742 | switch (scmnd->sc_data_direction) { |
bef4a34a | 743 | case DMA_TO_DEVICE: |
12fbd416 | 744 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
745 | break; |
746 | case DMA_FROM_DEVICE: | |
12fbd416 | 747 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
748 | break; |
749 | default: | |
12fbd416 | 750 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
751 | break; |
752 | } | |
753 | ||
d7a1bdb9 S |
754 | request->on_io_completion = storvsc_commmand_completion; |
755 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 756 | |
454f18a9 | 757 | /* request->PortId = scmnd->device->channel; */ |
795b613d | 758 | vm_srb->port_number = host_dev->port; |
735625fe | 759 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 760 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 761 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 762 | |
b856e738 | 763 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 764 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
765 | |
766 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 767 | |
d7a1bdb9 | 768 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
769 | |
770 | ||
d7a1bdb9 | 771 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
772 | if (scsi_sg_count(scmnd)) { |
773 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 774 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 775 | |
454f18a9 | 776 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
777 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
778 | DPRINT_INFO(STORVSC_DRV, | |
779 | "need to bounce buffer for this scmnd %p", | |
780 | scmnd); | |
781 | cmd_request->bounce_sgl = | |
782 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
783 | scsi_bufflen(scmnd)); | |
784 | if (!cmd_request->bounce_sgl) { | |
785 | DPRINT_ERR(STORVSC_DRV, | |
786 | "unable to create bounce buffer for " | |
787 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
788 | |
789 | scmnd->scsi_done = NULL; | |
790 | scmnd->host_scribble = NULL; | |
795b613d | 791 | kmem_cache_free(host_dev->request_pool, |
ff568d3a | 792 | cmd_request); |
bef4a34a HJ |
793 | |
794 | return SCSI_MLQUEUE_HOST_BUSY; | |
795 | } | |
796 | ||
ff568d3a | 797 | cmd_request->bounce_sgl_count = |
73509681 | 798 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 799 | PAGE_SHIFT; |
bef4a34a | 800 | |
ff568d3a GKH |
801 | /* |
802 | * FIXME: We can optimize on reads by just skipping | |
803 | * this | |
804 | */ | |
805 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
806 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
807 | |
808 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 809 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
810 | } |
811 | ||
d7a1bdb9 | 812 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 813 | |
77c5ceaf | 814 | for (i = 0; i < sg_count; i++) { |
0686e4f4 | 815 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n", |
ff568d3a | 816 | i, sgl[i].length, sgl[i].offset); |
d7a1bdb9 | 817 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 818 | page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a | 819 | } |
ff568d3a | 820 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 821 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 822 | request->data_buffer.offset = |
ff568d3a | 823 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 824 | request->data_buffer.pfn_array[0] = |
ff568d3a | 825 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 826 | } |
bef4a34a HJ |
827 | |
828 | retry_request: | |
454f18a9 | 829 | /* Invokes the vsc to start an IO */ |
c2ad4830 | 830 | ret = storvsc_drv_obj->on_io_request(dev, |
ff568d3a GKH |
831 | &cmd_request->request); |
832 | if (ret == -1) { | |
833 | /* no more space */ | |
834 | DPRINT_ERR(STORVSC_DRV, | |
835 | "scmnd (%p) - queue FULL...marking queue busy", | |
836 | scmnd); | |
837 | ||
838 | if (cmd_request->bounce_sgl_count) { | |
839 | /* | |
840 | * FIXME: We can optimize on writes by just skipping | |
841 | * this | |
842 | */ | |
843 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
844 | cmd_request->bounce_sgl, | |
845 | scsi_sg_count(scmnd)); | |
846 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
847 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
848 | } |
849 | ||
795b613d | 850 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
851 | |
852 | scmnd->scsi_done = NULL; | |
853 | scmnd->host_scribble = NULL; | |
854 | ||
855 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
856 | } | |
857 | ||
bef4a34a HJ |
858 | return ret; |
859 | } | |
860 | ||
f281233d JG |
861 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
862 | ||
ff568d3a GKH |
863 | static int storvsc_merge_bvec(struct request_queue *q, |
864 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 865 | { |
ff568d3a GKH |
866 | /* checking done by caller. */ |
867 | return bvec->bv_len; | |
bef4a34a | 868 | } |
bef4a34a | 869 | |
3e189519 | 870 | /* |
ff568d3a GKH |
871 | * storvsc_device_configure - Configure the specified scsi device |
872 | */ | |
bef4a34a HJ |
873 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
874 | { | |
ff568d3a GKH |
875 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
876 | sdevice, BLIST_SPARSELUN); | |
877 | /* | |
878 | * This enables luns to be located sparsely. Otherwise, we may not | |
879 | * discovered them. | |
880 | */ | |
bef4a34a | 881 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
882 | return 0; |
883 | } | |
884 | ||
885 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
886 | { | |
ff568d3a GKH |
887 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
888 | sdevice->queue_depth); | |
bef4a34a | 889 | |
ff568d3a GKH |
890 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
891 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
892 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
893 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 894 | |
ff568d3a GKH |
895 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
896 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
897 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
898 | ||
ff568d3a GKH |
899 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
900 | sdevice); | |
bef4a34a HJ |
901 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
902 | ||
903 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 904 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
905 | |
906 | return 0; | |
907 | } | |
908 | ||
3e189519 | 909 | /* |
ff568d3a GKH |
910 | * storvsc_host_reset_handler - Reset the scsi HBA |
911 | */ | |
bef4a34a HJ |
912 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
913 | { | |
ff568d3a | 914 | int ret; |
795b613d | 915 | struct hv_host_device *host_dev = |
972621c9 | 916 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 917 | struct hv_device *dev = host_dev->dev; |
bef4a34a | 918 | |
ff568d3a | 919 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
c2ad4830 | 920 | scmnd->device, dev); |
bef4a34a | 921 | |
454f18a9 | 922 | /* Invokes the vsc to reset the host/bus */ |
c2ad4830 | 923 | ret = stor_vsc_on_host_reset(dev); |
83c720ea | 924 | if (ret != 0) |
bef4a34a | 925 | return ret; |
bef4a34a | 926 | |
ff568d3a | 927 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
c2ad4830 | 928 | scmnd->device, dev); |
bef4a34a | 929 | |
bef4a34a HJ |
930 | return ret; |
931 | } | |
932 | ||
ff568d3a GKH |
933 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
934 | sector_t capacity, int *info) | |
bef4a34a HJ |
935 | { |
936 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
937 | sector_t cylinder_times_heads = 0; |
938 | sector_t temp = 0; | |
bef4a34a | 939 | |
ff568d3a GKH |
940 | int sectors_per_track = 0; |
941 | int heads = 0; | |
942 | int cylinders = 0; | |
943 | int rem = 0; | |
bef4a34a | 944 | |
ff568d3a GKH |
945 | if (total_sectors > (65535 * 16 * 255)) |
946 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 947 | |
ff568d3a GKH |
948 | if (total_sectors >= (65535 * 16 * 63)) { |
949 | sectors_per_track = 255; | |
950 | heads = 16; | |
bef4a34a HJ |
951 | |
952 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
953 | /* sector_div stores the quotient in cylinder_times_heads */ |
954 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
955 | } else { | |
956 | sectors_per_track = 17; | |
bef4a34a HJ |
957 | |
958 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
959 | /* sector_div stores the quotient in cylinder_times_heads */ |
960 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
961 | |
962 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
963 | /* sector_div stores the quotient in temp */ |
964 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
965 | |
966 | heads = temp; | |
967 | ||
ff568d3a GKH |
968 | if (heads < 4) |
969 | heads = 4; | |
bef4a34a | 970 | |
ff568d3a GKH |
971 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
972 | sectors_per_track = 31; | |
973 | heads = 16; | |
bef4a34a HJ |
974 | |
975 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
976 | /* |
977 | * sector_div stores the quotient in | |
978 | * cylinder_times_heads | |
979 | */ | |
980 | rem = sector_div(cylinder_times_heads, | |
981 | sectors_per_track); | |
982 | } | |
bef4a34a | 983 | |
ff568d3a GKH |
984 | if (cylinder_times_heads >= (heads * 1024)) { |
985 | sectors_per_track = 63; | |
986 | heads = 16; | |
bef4a34a HJ |
987 | |
988 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
989 | /* |
990 | * sector_div stores the quotient in | |
991 | * cylinder_times_heads | |
992 | */ | |
993 | rem = sector_div(cylinder_times_heads, | |
994 | sectors_per_track); | |
995 | } | |
996 | } | |
bef4a34a HJ |
997 | |
998 | temp = cylinder_times_heads; | |
ff568d3a GKH |
999 | /* sector_div stores the quotient in temp */ |
1000 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
1001 | cylinders = temp; |
1002 | ||
1003 | info[0] = heads; | |
ff568d3a GKH |
1004 | info[1] = sectors_per_track; |
1005 | info[2] = cylinders; | |
bef4a34a | 1006 | |
ff568d3a GKH |
1007 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1008 | sectors_per_track); | |
bef4a34a HJ |
1009 | |
1010 | return 0; | |
1011 | } | |
1012 | ||
bef4a34a HJ |
1013 | static int __init storvsc_init(void) |
1014 | { | |
1015 | int ret; | |
1016 | ||
bef4a34a | 1017 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 1018 | ret = storvsc_drv_init(); |
bef4a34a HJ |
1019 | return ret; |
1020 | } | |
1021 | ||
1022 | static void __exit storvsc_exit(void) | |
1023 | { | |
bef4a34a | 1024 | storvsc_drv_exit(); |
bef4a34a HJ |
1025 | } |
1026 | ||
ff568d3a | 1027 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1028 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1029 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
1030 | module_init(storvsc_init); |
1031 | module_exit(storvsc_exit); |