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 { |
ff568d3a GKH |
55 | /* must be 1st field |
56 | * FIXME this is a bug */ | |
ff568d3a | 57 | /* point back to our device context */ |
6bad88da | 58 | struct hv_device *device_ctx; |
ff568d3a GKH |
59 | struct kmem_cache *request_pool; |
60 | unsigned int port; | |
61 | unsigned char path; | |
62 | unsigned char target; | |
bef4a34a HJ |
63 | }; |
64 | ||
65 | struct storvsc_cmd_request { | |
ff568d3a GKH |
66 | struct list_head entry; |
67 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
68 | |
69 | unsigned int bounce_sgl_count; | |
ff568d3a | 70 | struct scatterlist *bounce_sgl; |
bef4a34a | 71 | |
0b3f6834 | 72 | struct hv_storvsc_request request; |
bef4a34a HJ |
73 | }; |
74 | ||
bef4a34a | 75 | |
6dec2442 S |
76 | /* |
77 | * stor_vsc_initialize - Main entry point | |
78 | */ | |
2b8b3582 | 79 | static int stor_vsc_initialize(struct hv_driver *driver) |
6dec2442 | 80 | { |
2e79505d | 81 | struct storvsc_driver *stor_driver; |
6dec2442 | 82 | |
ced01b0d | 83 | stor_driver = hvdr_to_stordr(driver); |
6dec2442 | 84 | |
d7a1bdb9 S |
85 | DPRINT_DBG(STORVSC, |
86 | "sizeof(struct hv_storvsc_request)=%zd " | |
6dec2442 S |
87 | "sizeof(struct vstor_packet)=%zd, " |
88 | "sizeof(struct vmscsi_request)=%zd", | |
89 | sizeof(struct hv_storvsc_request), | |
6dec2442 S |
90 | sizeof(struct vstor_packet), |
91 | sizeof(struct vmscsi_request)); | |
92 | ||
93 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
94 | ||
0f0cdc6a | 95 | driver->name = driver_name; |
6dec2442 S |
96 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
97 | sizeof(struct hv_guid)); | |
98 | ||
6dec2442 S |
99 | |
100 | /* | |
101 | * Divide the ring buffer data size (which is 1 page less | |
102 | * than the ring buffer size since that page is reserved for | |
103 | * the ring buffer indices) by the max request size (which is | |
104 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
105 | */ | |
106 | stor_driver->max_outstanding_req_per_channel = | |
107 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
108 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
109 | sizeof(struct vstor_packet) + sizeof(u64), | |
110 | sizeof(u64))); | |
111 | ||
112 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
113 | stor_driver->max_outstanding_req_per_channel, | |
114 | STORVSC_MAX_IO_REQUESTS); | |
115 | ||
116 | /* Setup the dispatch table */ | |
2ac5dad1 | 117 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 118 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 119 | |
bb465926 | 120 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
121 | |
122 | return 0; | |
123 | } | |
124 | ||
454f18a9 | 125 | /* Static decl */ |
9efd21e1 | 126 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 127 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a HJ |
128 | static int storvsc_device_alloc(struct scsi_device *); |
129 | static int storvsc_device_configure(struct scsi_device *); | |
130 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
415b023a | 131 | static int storvsc_remove(struct hv_device *dev); |
bef4a34a | 132 | |
ff568d3a GKH |
133 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
134 | unsigned int sg_count, | |
135 | unsigned int len); | |
136 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
137 | unsigned int sg_count); | |
bef4a34a | 138 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
139 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
140 | struct scatterlist *bounce_sgl, | |
141 | unsigned int orig_sgl_count); | |
142 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
143 | struct scatterlist *bounce_sgl, | |
144 | unsigned int orig_sgl_count); | |
bef4a34a | 145 | |
ff568d3a GKH |
146 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
147 | sector_t capacity, int *info); | |
bef4a34a HJ |
148 | |
149 | ||
150 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
151 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
152 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 153 | |
454f18a9 | 154 | /* The one and only one */ |
2e79505d | 155 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 156 | |
454f18a9 | 157 | /* Scsi driver */ |
bef4a34a | 158 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
159 | .module = THIS_MODULE, |
160 | .name = "storvsc_host_t", | |
161 | .bios_param = storvsc_get_chs, | |
162 | .queuecommand = storvsc_queuecommand, | |
163 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
164 | .slave_alloc = storvsc_device_alloc, | |
165 | .slave_configure = storvsc_device_configure, | |
166 | .cmd_per_lun = 1, | |
167 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 168 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 169 | .this_id = -1, |
454f18a9 | 170 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
171 | /* currently 32 */ |
172 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
173 | /* | |
174 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
175 | * into 1 sg element. If set, we must limit the max_segment_size to | |
176 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
177 | * multiple | |
178 | */ | |
454f18a9 | 179 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 180 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 181 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 182 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
183 | }; |
184 | ||
185 | ||
3e189519 | 186 | /* |
ff568d3a GKH |
187 | * storvsc_drv_init - StorVsc driver initialization. |
188 | */ | |
db085777 | 189 | static int storvsc_drv_init(void) |
bef4a34a | 190 | { |
ff568d3a | 191 | int ret; |
2e79505d | 192 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 193 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 194 | |
8a046024 | 195 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 196 | |
454f18a9 | 197 | /* Callback to client driver to complete the initialization */ |
db085777 | 198 | stor_vsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 199 | |
ff568d3a | 200 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 201 | "max outstanding reqs %u", |
8a046024 | 202 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 203 | |
8a046024 | 204 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
ff568d3a GKH |
205 | STORVSC_MAX_IO_REQUESTS) { |
206 | DPRINT_ERR(STORVSC_DRV, | |
207 | "The number of outstanding io requests (%d) " | |
208 | "is larger than that supported (%d) internally.", | |
209 | STORVSC_MAX_IO_REQUESTS, | |
8a046024 | 210 | storvsc_drv_obj->max_outstanding_req_per_channel); |
bef4a34a HJ |
211 | return -1; |
212 | } | |
213 | ||
150f9398 | 214 | drv->driver.name = storvsc_drv_obj->base.name; |
bef4a34a | 215 | |
9efd21e1 | 216 | drv->probe = storvsc_probe; |
415b023a | 217 | drv->remove = storvsc_remove; |
bef4a34a | 218 | |
454f18a9 | 219 | /* The driver belongs to vmbus */ |
150f9398 | 220 | ret = vmbus_child_driver_register(&drv->driver); |
bef4a34a | 221 | |
bef4a34a HJ |
222 | return ret; |
223 | } | |
224 | ||
af3043c6 | 225 | |
12cb12ef | 226 | static int stor_vsc_on_host_reset(struct hv_device *device) |
af3043c6 S |
227 | { |
228 | struct storvsc_device *stor_device; | |
d7a1bdb9 | 229 | struct hv_storvsc_request *request; |
af3043c6 | 230 | struct vstor_packet *vstor_packet; |
93958465 | 231 | int ret, t; |
af3043c6 S |
232 | |
233 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
234 | ||
235 | stor_device = get_stor_device(device); | |
236 | if (!stor_device) { | |
237 | DPRINT_ERR(STORVSC, "unable to get stor device..." | |
238 | "device being destroyed?"); | |
239 | return -1; | |
240 | } | |
241 | ||
242 | request = &stor_device->reset_request; | |
243 | vstor_packet = &request->vstor_packet; | |
244 | ||
93958465 | 245 | init_completion(&request->wait_event); |
af3043c6 S |
246 | |
247 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
248 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
249 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
250 | ||
af3043c6 S |
251 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
252 | sizeof(struct vstor_packet), | |
253 | (unsigned long)&stor_device->reset_request, | |
254 | VM_PKT_DATA_INBAND, | |
255 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
256 | if (ret != 0) { | |
257 | DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", | |
258 | vstor_packet, ret); | |
259 | goto cleanup; | |
260 | } | |
261 | ||
93958465 S |
262 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
263 | if (t == 0) { | |
af3043c6 S |
264 | ret = -ETIMEDOUT; |
265 | goto cleanup; | |
266 | } | |
267 | ||
268 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
269 | ||
270 | /* | |
271 | * At this point, all outstanding requests in the adapter | |
272 | * should have been flushed out and return to us | |
273 | */ | |
274 | ||
275 | cleanup: | |
276 | put_stor_device(device); | |
277 | return ret; | |
278 | } | |
279 | ||
bef4a34a HJ |
280 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
281 | { | |
282 | struct device **curr = (struct device **)data; | |
283 | *curr = dev; | |
454f18a9 | 284 | return 1; /* stop iterating */ |
bef4a34a HJ |
285 | } |
286 | ||
bd1de709 | 287 | static void storvsc_drv_exit(void) |
bef4a34a | 288 | { |
2e79505d | 289 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 290 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 291 | struct device *current_dev = NULL; |
2295ba2e | 292 | int ret; |
bef4a34a | 293 | |
ff568d3a | 294 | while (1) { |
bef4a34a HJ |
295 | current_dev = NULL; |
296 | ||
454f18a9 | 297 | /* Get the device */ |
150f9398 | 298 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
299 | (void *) ¤t_dev, |
300 | storvsc_drv_exit_cb); | |
301 | ||
302 | if (ret) | |
303 | DPRINT_WARN(STORVSC_DRV, | |
304 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
305 | |
306 | if (current_dev == NULL) | |
307 | break; | |
308 | ||
454f18a9 | 309 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
310 | device_unregister(current_dev); |
311 | } | |
312 | ||
ca623ad3 HZ |
313 | if (storvsc_drv_obj->base.cleanup) |
314 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 315 | |
150f9398 | 316 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
317 | return; |
318 | } | |
319 | ||
3e189519 | 320 | /* |
ff568d3a GKH |
321 | * storvsc_probe - Add a new device for this driver |
322 | */ | |
9efd21e1 | 323 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 324 | { |
ff568d3a | 325 | int ret; |
2e79505d | 326 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 327 | drv_to_stordrv(device->device.driver); |
bef4a34a | 328 | struct Scsi_Host *host; |
795b613d | 329 | struct hv_host_device *host_dev; |
9f0c7d2c | 330 | struct storvsc_device_info device_info; |
bef4a34a | 331 | |
ca623ad3 | 332 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
333 | return -1; |
334 | ||
ff568d3a | 335 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 336 | sizeof(struct hv_host_device)); |
ff568d3a | 337 | if (!host) { |
bef4a34a HJ |
338 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
339 | return -ENOMEM; | |
340 | } | |
341 | ||
9efd21e1 | 342 | dev_set_drvdata(&device->device, host); |
bef4a34a | 343 | |
795b613d S |
344 | host_dev = (struct hv_host_device *)host->hostdata; |
345 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 346 | |
795b613d S |
347 | host_dev->port = host->host_no; |
348 | host_dev->device_ctx = device; | |
bef4a34a | 349 | |
795b613d | 350 | host_dev->request_pool = |
9efd21e1 | 351 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 352 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
353 | SLAB_HWCACHE_ALIGN, NULL); |
354 | ||
795b613d | 355 | if (!host_dev->request_pool) { |
bef4a34a | 356 | scsi_host_put(host); |
bef4a34a HJ |
357 | return -ENOMEM; |
358 | } | |
359 | ||
8a046024 | 360 | device_info.port_number = host->host_no; |
454f18a9 | 361 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
362 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
363 | ||
ff568d3a | 364 | if (ret != 0) { |
bef4a34a | 365 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
795b613d | 366 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 367 | scsi_host_put(host); |
bef4a34a HJ |
368 | return -1; |
369 | } | |
370 | ||
454f18a9 | 371 | /* host_device_ctx->port = device_info.PortNumber; */ |
795b613d S |
372 | host_dev->path = device_info.path_id; |
373 | host_dev->target = device_info.target_id; | |
bef4a34a | 374 | |
ff568d3a GKH |
375 | /* max # of devices per target */ |
376 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
377 | /* max # of targets per channel */ | |
378 | host->max_id = STORVSC_MAX_TARGETS; | |
379 | /* max # of channels */ | |
380 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 381 | |
454f18a9 | 382 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 383 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 384 | if (ret != 0) { |
bef4a34a HJ |
385 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
386 | ||
9efd21e1 | 387 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a | 388 | |
795b613d | 389 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 390 | scsi_host_put(host); |
bef4a34a HJ |
391 | return -1; |
392 | } | |
393 | ||
394 | scsi_scan_host(host); | |
bef4a34a HJ |
395 | return ret; |
396 | } | |
397 | ||
3e189519 | 398 | /* |
ff568d3a GKH |
399 | * storvsc_remove - Callback when our device is removed |
400 | */ | |
415b023a | 401 | static int storvsc_remove(struct hv_device *dev) |
bef4a34a | 402 | { |
2e79505d | 403 | struct storvsc_driver *storvsc_drv_obj = |
415b023a S |
404 | drv_to_stordrv(dev->device.driver); |
405 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
795b613d | 406 | struct hv_host_device *host_dev = |
972621c9 | 407 | (struct hv_host_device *)host->hostdata; |
bef4a34a | 408 | |
ff568d3a GKH |
409 | /* |
410 | * Call to the vsc driver to let it know that the device is being | |
411 | * removed | |
412 | */ | |
415b023a | 413 | storvsc_drv_obj->base.dev_rm(dev); |
bef4a34a | 414 | |
795b613d S |
415 | if (host_dev->request_pool) { |
416 | kmem_cache_destroy(host_dev->request_pool); | |
417 | host_dev->request_pool = NULL; | |
bef4a34a HJ |
418 | } |
419 | ||
420 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
421 | scsi_remove_host(host); | |
422 | ||
423 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
424 | scsi_host_put(host); | |
1c8d0b7d | 425 | return 0; |
bef4a34a HJ |
426 | } |
427 | ||
3e189519 | 428 | /* |
ff568d3a GKH |
429 | * storvsc_commmand_completion - Command completion processing |
430 | */ | |
0b3f6834 | 431 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 432 | { |
ff568d3a | 433 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 434 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 435 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
795b613d | 436 | struct hv_host_device *host_dev = |
972621c9 | 437 | (struct hv_host_device *)scmnd->device->host->hostdata; |
bef4a34a | 438 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 439 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 440 | struct vmscsi_request *vm_srb; |
bef4a34a | 441 | |
b856e738 BP |
442 | /* ASSERT(request == &cmd_request->request); */ |
443 | /* ASSERT(scmnd); */ | |
444 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
445 | /* (unsigned long)cmd_request); */ | |
446 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 447 | |
ff568d3a GKH |
448 | if (cmd_request->bounce_sgl_count) { |
449 | /* using bounce buffer */ | |
454f18a9 | 450 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 451 | |
454f18a9 | 452 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
453 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
454 | cmd_request->bounce_sgl, | |
455 | scsi_sg_count(scmnd)); | |
456 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
457 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
458 | } |
459 | ||
d7a1bdb9 | 460 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 461 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 462 | |
ff568d3a GKH |
463 | if (scmnd->result) { |
464 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 465 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 466 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
467 | } |
468 | ||
8a046024 HJ |
469 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
470 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 471 | request->data_buffer.len - |
e9e936c6 | 472 | vm_srb->data_transfer_length); |
bef4a34a HJ |
473 | |
474 | scsi_done_fn = scmnd->scsi_done; | |
475 | ||
476 | scmnd->host_scribble = NULL; | |
477 | scmnd->scsi_done = NULL; | |
478 | ||
454f18a9 | 479 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
480 | scsi_done_fn(scmnd); |
481 | ||
795b613d | 482 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
483 | } |
484 | ||
485 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
486 | { | |
ff568d3a | 487 | int i; |
bef4a34a | 488 | |
454f18a9 | 489 | /* No need to check */ |
bef4a34a HJ |
490 | if (sg_count < 2) |
491 | return -1; | |
492 | ||
454f18a9 | 493 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
494 | for (i = 0; i < sg_count; i++) { |
495 | if (i == 0) { | |
496 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
497 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
498 | return i; | |
ff568d3a GKH |
499 | } else if (i == sg_count - 1) { |
500 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
501 | if (sgl[i].offset != 0) |
502 | return i; | |
ff568d3a GKH |
503 | } else { |
504 | /* make sure no hole in the middle */ | |
bef4a34a | 505 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 506 | return i; |
bef4a34a HJ |
507 | } |
508 | } | |
509 | return -1; | |
510 | } | |
511 | ||
ff568d3a GKH |
512 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
513 | unsigned int sg_count, | |
514 | unsigned int len) | |
bef4a34a HJ |
515 | { |
516 | int i; | |
ff568d3a GKH |
517 | int num_pages; |
518 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
519 | struct page *page_buf; |
520 | ||
73509681 | 521 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 522 | |
06da0bc8 | 523 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 524 | if (!bounce_sgl) |
bef4a34a | 525 | return NULL; |
bef4a34a | 526 | |
ff568d3a | 527 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
528 | page_buf = alloc_page(GFP_ATOMIC); |
529 | if (!page_buf) | |
bef4a34a | 530 | goto cleanup; |
bef4a34a | 531 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
532 | } |
533 | ||
534 | return bounce_sgl; | |
535 | ||
536 | cleanup: | |
537 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
538 | return NULL; | |
539 | } | |
540 | ||
ff568d3a GKH |
541 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
542 | unsigned int sg_count) | |
bef4a34a HJ |
543 | { |
544 | int i; | |
545 | struct page *page_buf; | |
546 | ||
ff568d3a GKH |
547 | for (i = 0; i < sg_count; i++) { |
548 | page_buf = sg_page((&sgl[i])); | |
549 | if (page_buf != NULL) | |
bef4a34a | 550 | __free_page(page_buf); |
bef4a34a HJ |
551 | } |
552 | ||
553 | kfree(sgl); | |
554 | } | |
555 | ||
454f18a9 | 556 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
557 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
558 | struct scatterlist *bounce_sgl, | |
559 | unsigned int orig_sgl_count) | |
bef4a34a | 560 | { |
ff568d3a GKH |
561 | int i; |
562 | int j = 0; | |
bef4a34a HJ |
563 | unsigned long src, dest; |
564 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
565 | unsigned int total_copied = 0; |
566 | unsigned long bounce_addr = 0; | |
567 | unsigned long src_addr = 0; | |
bef4a34a HJ |
568 | unsigned long flags; |
569 | ||
570 | local_irq_save(flags); | |
571 | ||
ff568d3a GKH |
572 | for (i = 0; i < orig_sgl_count; i++) { |
573 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
574 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
575 | src = src_addr; |
576 | srclen = orig_sgl[i].length; | |
577 | ||
b856e738 | 578 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 579 | |
0c47a70a | 580 | if (bounce_addr == 0) |
bef4a34a | 581 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 582 | |
ff568d3a | 583 | while (srclen) { |
454f18a9 | 584 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
585 | dest = bounce_addr + bounce_sgl[j].length; |
586 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
587 | ||
fc6a4b26 | 588 | copylen = min(srclen, destlen); |
ff568d3a | 589 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
590 | |
591 | total_copied += copylen; | |
592 | bounce_sgl[j].length += copylen; | |
593 | srclen -= copylen; | |
594 | src += copylen; | |
595 | ||
ff568d3a GKH |
596 | if (bounce_sgl[j].length == PAGE_SIZE) { |
597 | /* full..move to next entry */ | |
598 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
599 | j++; |
600 | ||
454f18a9 | 601 | /* if we need to use another bounce buffer */ |
ff568d3a | 602 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 603 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
604 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
605 | /* unmap the last bounce that is < PAGE_SIZE */ | |
606 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
607 | } |
608 | } | |
609 | ||
ff568d3a | 610 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
611 | } |
612 | ||
613 | local_irq_restore(flags); | |
614 | ||
615 | return total_copied; | |
616 | } | |
617 | ||
454f18a9 | 618 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
619 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
620 | struct scatterlist *bounce_sgl, | |
621 | unsigned int orig_sgl_count) | |
bef4a34a | 622 | { |
ff568d3a GKH |
623 | int i; |
624 | int j = 0; | |
bef4a34a HJ |
625 | unsigned long src, dest; |
626 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
627 | unsigned int total_copied = 0; |
628 | unsigned long bounce_addr = 0; | |
629 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
630 | unsigned long flags; |
631 | ||
632 | local_irq_save(flags); | |
633 | ||
ff568d3a GKH |
634 | for (i = 0; i < orig_sgl_count; i++) { |
635 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
636 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
637 | dest = dest_addr; |
638 | destlen = orig_sgl[i].length; | |
b856e738 | 639 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 640 | |
0c47a70a | 641 | if (bounce_addr == 0) |
bef4a34a | 642 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 643 | |
ff568d3a | 644 | while (destlen) { |
bef4a34a HJ |
645 | src = bounce_addr + bounce_sgl[j].offset; |
646 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
647 | ||
fc6a4b26 | 648 | copylen = min(srclen, destlen); |
ff568d3a | 649 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
650 | |
651 | total_copied += copylen; | |
652 | bounce_sgl[j].offset += copylen; | |
653 | destlen -= copylen; | |
654 | dest += copylen; | |
655 | ||
ff568d3a GKH |
656 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
657 | /* full */ | |
658 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
659 | j++; |
660 | ||
454f18a9 | 661 | /* if we need to use another bounce buffer */ |
ff568d3a | 662 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 663 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
664 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
665 | /* unmap the last bounce that is < PAGE_SIZE */ | |
666 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
667 | } |
668 | } | |
669 | ||
ff568d3a GKH |
670 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
671 | KM_IRQ0); | |
bef4a34a HJ |
672 | } |
673 | ||
674 | local_irq_restore(flags); | |
675 | ||
676 | return total_copied; | |
677 | } | |
678 | ||
3e189519 | 679 | /* |
ff568d3a GKH |
680 | * storvsc_queuecommand - Initiate command processing |
681 | */ | |
f281233d | 682 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 683 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 684 | { |
ff568d3a | 685 | int ret; |
795b613d | 686 | struct hv_host_device *host_dev = |
972621c9 | 687 | (struct hv_host_device *)scmnd->device->host->hostdata; |
795b613d | 688 | struct hv_device *device_ctx = host_dev->device_ctx; |
2e79505d | 689 | struct storvsc_driver *storvsc_drv_obj = |
28e7f2a8 | 690 | drv_to_stordrv(device_ctx->device.driver); |
0b3f6834 | 691 | struct hv_storvsc_request *request; |
bef4a34a | 692 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 693 | unsigned int request_size = 0; |
bef4a34a HJ |
694 | int i; |
695 | struct scatterlist *sgl; | |
77c5ceaf | 696 | unsigned int sg_count = 0; |
12fbd416 | 697 | struct vmscsi_request *vm_srb; |
bef4a34a | 698 | |
ff568d3a GKH |
699 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
700 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
701 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
702 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
703 | scmnd->device->tagged_supported); | |
bef4a34a | 704 | |
454f18a9 | 705 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 706 | if (scmnd->host_scribble) { |
b856e738 | 707 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 708 | |
ff568d3a GKH |
709 | cmd_request = |
710 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
711 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
712 | scmnd, cmd_request); | |
bef4a34a HJ |
713 | |
714 | goto retry_request; | |
715 | } | |
716 | ||
b856e738 BP |
717 | /* ASSERT(scmnd->scsi_done == NULL); */ |
718 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
719 | |
720 | scmnd->scsi_done = done; | |
721 | ||
722 | request_size = sizeof(struct storvsc_cmd_request); | |
723 | ||
795b613d | 724 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
ff568d3a GKH |
725 | GFP_ATOMIC); |
726 | if (!cmd_request) { | |
727 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
728 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
729 | scmnd->scsi_done = NULL; |
730 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
731 | } | |
732 | ||
454f18a9 | 733 | /* Setup the cmd request */ |
bef4a34a HJ |
734 | cmd_request->bounce_sgl_count = 0; |
735 | cmd_request->bounce_sgl = NULL; | |
736 | cmd_request->cmd = scmnd; | |
737 | ||
ff568d3a | 738 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
739 | |
740 | request = &cmd_request->request; | |
d7a1bdb9 | 741 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 742 | |
1e05d88e | 743 | DPRINT_DBG(STORVSC_DRV, "req %p size %d", request, request_size); |
bef4a34a | 744 | |
454f18a9 | 745 | /* Build the SRB */ |
ff568d3a | 746 | switch (scmnd->sc_data_direction) { |
bef4a34a | 747 | case DMA_TO_DEVICE: |
12fbd416 | 748 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
749 | break; |
750 | case DMA_FROM_DEVICE: | |
12fbd416 | 751 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
752 | break; |
753 | default: | |
12fbd416 | 754 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
755 | break; |
756 | } | |
757 | ||
d7a1bdb9 S |
758 | request->on_io_completion = storvsc_commmand_completion; |
759 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 760 | |
454f18a9 | 761 | /* request->PortId = scmnd->device->channel; */ |
795b613d | 762 | vm_srb->port_number = host_dev->port; |
735625fe | 763 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 764 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 765 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 766 | |
b856e738 | 767 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 768 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
769 | |
770 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 771 | |
d7a1bdb9 | 772 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
773 | |
774 | ||
d7a1bdb9 | 775 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
776 | if (scsi_sg_count(scmnd)) { |
777 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 778 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 779 | |
454f18a9 | 780 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
781 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
782 | DPRINT_INFO(STORVSC_DRV, | |
783 | "need to bounce buffer for this scmnd %p", | |
784 | scmnd); | |
785 | cmd_request->bounce_sgl = | |
786 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
787 | scsi_bufflen(scmnd)); | |
788 | if (!cmd_request->bounce_sgl) { | |
789 | DPRINT_ERR(STORVSC_DRV, | |
790 | "unable to create bounce buffer for " | |
791 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
792 | |
793 | scmnd->scsi_done = NULL; | |
794 | scmnd->host_scribble = NULL; | |
795b613d | 795 | kmem_cache_free(host_dev->request_pool, |
ff568d3a | 796 | cmd_request); |
bef4a34a HJ |
797 | |
798 | return SCSI_MLQUEUE_HOST_BUSY; | |
799 | } | |
800 | ||
ff568d3a | 801 | cmd_request->bounce_sgl_count = |
73509681 | 802 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 803 | PAGE_SHIFT; |
bef4a34a | 804 | |
ff568d3a GKH |
805 | /* |
806 | * FIXME: We can optimize on reads by just skipping | |
807 | * this | |
808 | */ | |
809 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
810 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
811 | |
812 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 813 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
814 | } |
815 | ||
d7a1bdb9 | 816 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 817 | |
77c5ceaf | 818 | for (i = 0; i < sg_count; i++) { |
0686e4f4 | 819 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n", |
ff568d3a | 820 | i, sgl[i].length, sgl[i].offset); |
d7a1bdb9 | 821 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 822 | page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a | 823 | } |
ff568d3a | 824 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 825 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 826 | request->data_buffer.offset = |
ff568d3a | 827 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 828 | request->data_buffer.pfn_array[0] = |
ff568d3a | 829 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 830 | } |
bef4a34a HJ |
831 | |
832 | retry_request: | |
454f18a9 | 833 | /* Invokes the vsc to start an IO */ |
6bad88da | 834 | ret = storvsc_drv_obj->on_io_request(device_ctx, |
ff568d3a GKH |
835 | &cmd_request->request); |
836 | if (ret == -1) { | |
837 | /* no more space */ | |
838 | DPRINT_ERR(STORVSC_DRV, | |
839 | "scmnd (%p) - queue FULL...marking queue busy", | |
840 | scmnd); | |
841 | ||
842 | if (cmd_request->bounce_sgl_count) { | |
843 | /* | |
844 | * FIXME: We can optimize on writes by just skipping | |
845 | * this | |
846 | */ | |
847 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
848 | cmd_request->bounce_sgl, | |
849 | scsi_sg_count(scmnd)); | |
850 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
851 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
852 | } |
853 | ||
795b613d | 854 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
855 | |
856 | scmnd->scsi_done = NULL; | |
857 | scmnd->host_scribble = NULL; | |
858 | ||
859 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
860 | } | |
861 | ||
bef4a34a HJ |
862 | return ret; |
863 | } | |
864 | ||
f281233d JG |
865 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
866 | ||
ff568d3a GKH |
867 | static int storvsc_merge_bvec(struct request_queue *q, |
868 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 869 | { |
ff568d3a GKH |
870 | /* checking done by caller. */ |
871 | return bvec->bv_len; | |
bef4a34a | 872 | } |
bef4a34a | 873 | |
3e189519 | 874 | /* |
ff568d3a GKH |
875 | * storvsc_device_configure - Configure the specified scsi device |
876 | */ | |
bef4a34a HJ |
877 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
878 | { | |
ff568d3a GKH |
879 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
880 | sdevice, BLIST_SPARSELUN); | |
881 | /* | |
882 | * This enables luns to be located sparsely. Otherwise, we may not | |
883 | * discovered them. | |
884 | */ | |
bef4a34a | 885 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
886 | return 0; |
887 | } | |
888 | ||
889 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
890 | { | |
ff568d3a GKH |
891 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
892 | sdevice->queue_depth); | |
bef4a34a | 893 | |
ff568d3a GKH |
894 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
895 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
896 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
897 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 898 | |
ff568d3a GKH |
899 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
900 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
901 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
902 | ||
ff568d3a GKH |
903 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
904 | sdevice); | |
bef4a34a HJ |
905 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
906 | ||
907 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 908 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
909 | |
910 | return 0; | |
911 | } | |
912 | ||
3e189519 | 913 | /* |
ff568d3a GKH |
914 | * storvsc_host_reset_handler - Reset the scsi HBA |
915 | */ | |
bef4a34a HJ |
916 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
917 | { | |
ff568d3a | 918 | int ret; |
795b613d | 919 | struct hv_host_device *host_dev = |
972621c9 | 920 | (struct hv_host_device *)scmnd->device->host->hostdata; |
795b613d | 921 | struct hv_device *device_ctx = host_dev->device_ctx; |
bef4a34a | 922 | |
ff568d3a | 923 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
6bad88da | 924 | scmnd->device, device_ctx); |
bef4a34a | 925 | |
454f18a9 | 926 | /* Invokes the vsc to reset the host/bus */ |
6bad88da | 927 | ret = stor_vsc_on_host_reset(device_ctx); |
83c720ea | 928 | if (ret != 0) |
bef4a34a | 929 | return ret; |
bef4a34a | 930 | |
ff568d3a | 931 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
6bad88da | 932 | scmnd->device, device_ctx); |
bef4a34a | 933 | |
bef4a34a HJ |
934 | return ret; |
935 | } | |
936 | ||
ff568d3a GKH |
937 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
938 | sector_t capacity, int *info) | |
bef4a34a HJ |
939 | { |
940 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
941 | sector_t cylinder_times_heads = 0; |
942 | sector_t temp = 0; | |
bef4a34a | 943 | |
ff568d3a GKH |
944 | int sectors_per_track = 0; |
945 | int heads = 0; | |
946 | int cylinders = 0; | |
947 | int rem = 0; | |
bef4a34a | 948 | |
ff568d3a GKH |
949 | if (total_sectors > (65535 * 16 * 255)) |
950 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 951 | |
ff568d3a GKH |
952 | if (total_sectors >= (65535 * 16 * 63)) { |
953 | sectors_per_track = 255; | |
954 | heads = 16; | |
bef4a34a HJ |
955 | |
956 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
957 | /* sector_div stores the quotient in cylinder_times_heads */ |
958 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
959 | } else { | |
960 | sectors_per_track = 17; | |
bef4a34a HJ |
961 | |
962 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
963 | /* sector_div stores the quotient in cylinder_times_heads */ |
964 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
965 | |
966 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
967 | /* sector_div stores the quotient in temp */ |
968 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
969 | |
970 | heads = temp; | |
971 | ||
ff568d3a GKH |
972 | if (heads < 4) |
973 | heads = 4; | |
bef4a34a | 974 | |
ff568d3a GKH |
975 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
976 | sectors_per_track = 31; | |
977 | heads = 16; | |
bef4a34a HJ |
978 | |
979 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
980 | /* |
981 | * sector_div stores the quotient in | |
982 | * cylinder_times_heads | |
983 | */ | |
984 | rem = sector_div(cylinder_times_heads, | |
985 | sectors_per_track); | |
986 | } | |
bef4a34a | 987 | |
ff568d3a GKH |
988 | if (cylinder_times_heads >= (heads * 1024)) { |
989 | sectors_per_track = 63; | |
990 | heads = 16; | |
bef4a34a HJ |
991 | |
992 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
993 | /* |
994 | * sector_div stores the quotient in | |
995 | * cylinder_times_heads | |
996 | */ | |
997 | rem = sector_div(cylinder_times_heads, | |
998 | sectors_per_track); | |
999 | } | |
1000 | } | |
bef4a34a HJ |
1001 | |
1002 | temp = cylinder_times_heads; | |
ff568d3a GKH |
1003 | /* sector_div stores the quotient in temp */ |
1004 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
1005 | cylinders = temp; |
1006 | ||
1007 | info[0] = heads; | |
ff568d3a GKH |
1008 | info[1] = sectors_per_track; |
1009 | info[2] = cylinders; | |
bef4a34a | 1010 | |
ff568d3a GKH |
1011 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1012 | sectors_per_track); | |
bef4a34a HJ |
1013 | |
1014 | return 0; | |
1015 | } | |
1016 | ||
bef4a34a HJ |
1017 | static int __init storvsc_init(void) |
1018 | { | |
1019 | int ret; | |
1020 | ||
bef4a34a | 1021 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 1022 | ret = storvsc_drv_init(); |
bef4a34a HJ |
1023 | return ret; |
1024 | } | |
1025 | ||
1026 | static void __exit storvsc_exit(void) | |
1027 | { | |
bef4a34a | 1028 | storvsc_drv_exit(); |
bef4a34a HJ |
1029 | } |
1030 | ||
ff568d3a | 1031 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1032 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1033 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
1034 | module_init(storvsc_init); |
1035 | module_exit(storvsc_exit); |