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 | |
6dec2442 S |
82 | |
83 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
84 | ||
0f0cdc6a | 85 | driver->name = driver_name; |
6dec2442 S |
86 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
87 | sizeof(struct hv_guid)); | |
88 | ||
6dec2442 S |
89 | |
90 | /* | |
91 | * Divide the ring buffer data size (which is 1 page less | |
92 | * than the ring buffer size since that page is reserved for | |
93 | * the ring buffer indices) by the max request size (which is | |
94 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
95 | */ | |
96 | stor_driver->max_outstanding_req_per_channel = | |
97 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
98 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
99 | sizeof(struct vstor_packet) + sizeof(u64), | |
100 | sizeof(u64))); | |
101 | ||
102 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
103 | stor_driver->max_outstanding_req_per_channel, | |
104 | STORVSC_MAX_IO_REQUESTS); | |
105 | ||
106 | /* Setup the dispatch table */ | |
2ac5dad1 | 107 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 108 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 109 | |
bb465926 | 110 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
111 | |
112 | return 0; | |
113 | } | |
114 | ||
5b60acee S |
115 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
116 | { | |
117 | /* | |
118 | * This enables luns to be located sparsely. Otherwise, we may not | |
119 | * discovered them. | |
120 | */ | |
121 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
122 | return 0; | |
123 | } | |
124 | ||
a1ebfeae S |
125 | static int storvsc_merge_bvec(struct request_queue *q, |
126 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
127 | { | |
128 | /* checking done by caller. */ | |
129 | return bvec->bv_len; | |
130 | } | |
131 | ||
419f2d03 S |
132 | static int storvsc_device_configure(struct scsi_device *sdevice) |
133 | { | |
134 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
135 | STORVSC_MAX_IO_REQUESTS); | |
136 | ||
137 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", | |
138 | sdevice, PAGE_SIZE); | |
139 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); | |
140 | ||
141 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", | |
142 | sdevice); | |
143 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
144 | ||
145 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
146 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
49a3c7a9 S |
151 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
152 | unsigned int sg_count) | |
153 | { | |
154 | int i; | |
155 | struct page *page_buf; | |
156 | ||
157 | for (i = 0; i < sg_count; i++) { | |
158 | page_buf = sg_page((&sgl[i])); | |
159 | if (page_buf != NULL) | |
160 | __free_page(page_buf); | |
161 | } | |
162 | ||
163 | kfree(sgl); | |
164 | } | |
165 | ||
3862ef3e S |
166 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
167 | { | |
168 | int i; | |
169 | ||
170 | /* No need to check */ | |
171 | if (sg_count < 2) | |
172 | return -1; | |
173 | ||
174 | /* We have at least 2 sg entries */ | |
175 | for (i = 0; i < sg_count; i++) { | |
176 | if (i == 0) { | |
177 | /* make sure 1st one does not have hole */ | |
178 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
179 | return i; | |
180 | } else if (i == sg_count - 1) { | |
181 | /* make sure last one does not have hole */ | |
182 | if (sgl[i].offset != 0) | |
183 | return i; | |
184 | } else { | |
185 | /* make sure no hole in the middle */ | |
186 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
187 | return i; | |
188 | } | |
189 | } | |
190 | return -1; | |
191 | } | |
192 | ||
454f18a9 | 193 | /* Static decl */ |
9efd21e1 | 194 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 195 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a | 196 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); |
415b023a | 197 | static int storvsc_remove(struct hv_device *dev); |
bef4a34a | 198 | |
ff568d3a GKH |
199 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
200 | unsigned int sg_count, | |
201 | unsigned int len); | |
ff568d3a GKH |
202 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
203 | struct scatterlist *bounce_sgl, | |
204 | unsigned int orig_sgl_count); | |
205 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
206 | struct scatterlist *bounce_sgl, | |
207 | unsigned int orig_sgl_count); | |
bef4a34a | 208 | |
ff568d3a GKH |
209 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
210 | sector_t capacity, int *info); | |
bef4a34a HJ |
211 | |
212 | ||
213 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
214 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
215 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 216 | |
454f18a9 | 217 | /* The one and only one */ |
2e79505d | 218 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 219 | |
454f18a9 | 220 | /* Scsi driver */ |
bef4a34a | 221 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
222 | .module = THIS_MODULE, |
223 | .name = "storvsc_host_t", | |
224 | .bios_param = storvsc_get_chs, | |
225 | .queuecommand = storvsc_queuecommand, | |
226 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
227 | .slave_alloc = storvsc_device_alloc, | |
228 | .slave_configure = storvsc_device_configure, | |
229 | .cmd_per_lun = 1, | |
230 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 231 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 232 | .this_id = -1, |
454f18a9 | 233 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
234 | /* currently 32 */ |
235 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
236 | /* | |
237 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
238 | * into 1 sg element. If set, we must limit the max_segment_size to | |
239 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
240 | * multiple | |
241 | */ | |
454f18a9 | 242 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 243 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 244 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 245 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
246 | }; |
247 | ||
248 | ||
3e189519 | 249 | /* |
ff568d3a GKH |
250 | * storvsc_drv_init - StorVsc driver initialization. |
251 | */ | |
db085777 | 252 | static int storvsc_drv_init(void) |
bef4a34a | 253 | { |
ff568d3a | 254 | int ret; |
2e79505d | 255 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 256 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 257 | |
8a046024 | 258 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 259 | |
454f18a9 | 260 | /* Callback to client driver to complete the initialization */ |
db085777 | 261 | stor_vsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 262 | |
ff568d3a | 263 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 264 | "max outstanding reqs %u", |
8a046024 | 265 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 266 | |
8a046024 | 267 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
f8feed06 | 268 | STORVSC_MAX_IO_REQUESTS) |
bef4a34a | 269 | return -1; |
bef4a34a | 270 | |
150f9398 | 271 | drv->driver.name = storvsc_drv_obj->base.name; |
bef4a34a | 272 | |
9efd21e1 | 273 | drv->probe = storvsc_probe; |
415b023a | 274 | drv->remove = storvsc_remove; |
bef4a34a | 275 | |
454f18a9 | 276 | /* The driver belongs to vmbus */ |
150f9398 | 277 | ret = vmbus_child_driver_register(&drv->driver); |
bef4a34a | 278 | |
bef4a34a HJ |
279 | return ret; |
280 | } | |
281 | ||
af3043c6 | 282 | |
12cb12ef | 283 | static int stor_vsc_on_host_reset(struct hv_device *device) |
af3043c6 S |
284 | { |
285 | struct storvsc_device *stor_device; | |
d7a1bdb9 | 286 | struct hv_storvsc_request *request; |
af3043c6 | 287 | struct vstor_packet *vstor_packet; |
93958465 | 288 | int ret, t; |
af3043c6 S |
289 | |
290 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
291 | ||
292 | stor_device = get_stor_device(device); | |
f8feed06 | 293 | if (!stor_device) |
af3043c6 | 294 | return -1; |
af3043c6 S |
295 | |
296 | request = &stor_device->reset_request; | |
297 | vstor_packet = &request->vstor_packet; | |
298 | ||
93958465 | 299 | init_completion(&request->wait_event); |
af3043c6 S |
300 | |
301 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
302 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
303 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
304 | ||
af3043c6 S |
305 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
306 | sizeof(struct vstor_packet), | |
307 | (unsigned long)&stor_device->reset_request, | |
308 | VM_PKT_DATA_INBAND, | |
309 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
f8feed06 | 310 | if (ret != 0) |
af3043c6 | 311 | goto cleanup; |
af3043c6 | 312 | |
93958465 S |
313 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
314 | if (t == 0) { | |
af3043c6 S |
315 | ret = -ETIMEDOUT; |
316 | goto cleanup; | |
317 | } | |
318 | ||
319 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
320 | ||
321 | /* | |
322 | * At this point, all outstanding requests in the adapter | |
323 | * should have been flushed out and return to us | |
324 | */ | |
325 | ||
326 | cleanup: | |
327 | put_stor_device(device); | |
328 | return ret; | |
329 | } | |
330 | ||
bef4a34a HJ |
331 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
332 | { | |
333 | struct device **curr = (struct device **)data; | |
334 | *curr = dev; | |
454f18a9 | 335 | return 1; /* stop iterating */ |
bef4a34a HJ |
336 | } |
337 | ||
bd1de709 | 338 | static void storvsc_drv_exit(void) |
bef4a34a | 339 | { |
2e79505d | 340 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 341 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 342 | struct device *current_dev = NULL; |
2295ba2e | 343 | int ret; |
bef4a34a | 344 | |
ff568d3a | 345 | while (1) { |
bef4a34a HJ |
346 | current_dev = NULL; |
347 | ||
454f18a9 | 348 | /* Get the device */ |
150f9398 | 349 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
350 | (void *) ¤t_dev, |
351 | storvsc_drv_exit_cb); | |
352 | ||
bef4a34a HJ |
353 | |
354 | if (current_dev == NULL) | |
355 | break; | |
356 | ||
454f18a9 | 357 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
358 | device_unregister(current_dev); |
359 | } | |
360 | ||
ca623ad3 HZ |
361 | if (storvsc_drv_obj->base.cleanup) |
362 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 363 | |
150f9398 | 364 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
365 | return; |
366 | } | |
367 | ||
3e189519 | 368 | /* |
ff568d3a GKH |
369 | * storvsc_probe - Add a new device for this driver |
370 | */ | |
9efd21e1 | 371 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 372 | { |
ff568d3a | 373 | int ret; |
2e79505d | 374 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 375 | drv_to_stordrv(device->device.driver); |
bef4a34a | 376 | struct Scsi_Host *host; |
795b613d | 377 | struct hv_host_device *host_dev; |
9f0c7d2c | 378 | struct storvsc_device_info device_info; |
bef4a34a | 379 | |
ca623ad3 | 380 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
381 | return -1; |
382 | ||
ff568d3a | 383 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 384 | sizeof(struct hv_host_device)); |
f8feed06 | 385 | if (!host) |
bef4a34a | 386 | return -ENOMEM; |
bef4a34a | 387 | |
9efd21e1 | 388 | dev_set_drvdata(&device->device, host); |
bef4a34a | 389 | |
795b613d S |
390 | host_dev = (struct hv_host_device *)host->hostdata; |
391 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 392 | |
795b613d | 393 | host_dev->port = host->host_no; |
97c15296 | 394 | host_dev->dev = device; |
bef4a34a | 395 | |
795b613d | 396 | host_dev->request_pool = |
9efd21e1 | 397 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 398 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
399 | SLAB_HWCACHE_ALIGN, NULL); |
400 | ||
795b613d | 401 | if (!host_dev->request_pool) { |
bef4a34a | 402 | scsi_host_put(host); |
bef4a34a HJ |
403 | return -ENOMEM; |
404 | } | |
405 | ||
8a046024 | 406 | device_info.port_number = host->host_no; |
454f18a9 | 407 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
408 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
409 | ||
ff568d3a | 410 | if (ret != 0) { |
795b613d | 411 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 412 | scsi_host_put(host); |
bef4a34a HJ |
413 | return -1; |
414 | } | |
415 | ||
795b613d S |
416 | host_dev->path = device_info.path_id; |
417 | host_dev->target = device_info.target_id; | |
bef4a34a | 418 | |
ff568d3a GKH |
419 | /* max # of devices per target */ |
420 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
421 | /* max # of targets per channel */ | |
422 | host->max_id = STORVSC_MAX_TARGETS; | |
423 | /* max # of channels */ | |
424 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 425 | |
454f18a9 | 426 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 427 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 428 | if (ret != 0) { |
bef4a34a | 429 | |
9efd21e1 | 430 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a | 431 | |
795b613d | 432 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 433 | scsi_host_put(host); |
bef4a34a HJ |
434 | return -1; |
435 | } | |
436 | ||
437 | scsi_scan_host(host); | |
bef4a34a HJ |
438 | return ret; |
439 | } | |
440 | ||
3e189519 | 441 | /* |
ff568d3a GKH |
442 | * storvsc_remove - Callback when our device is removed |
443 | */ | |
415b023a | 444 | static int storvsc_remove(struct hv_device *dev) |
bef4a34a | 445 | { |
2e79505d | 446 | struct storvsc_driver *storvsc_drv_obj = |
415b023a S |
447 | drv_to_stordrv(dev->device.driver); |
448 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
795b613d | 449 | struct hv_host_device *host_dev = |
972621c9 | 450 | (struct hv_host_device *)host->hostdata; |
bef4a34a | 451 | |
ff568d3a GKH |
452 | /* |
453 | * Call to the vsc driver to let it know that the device is being | |
454 | * removed | |
455 | */ | |
415b023a | 456 | storvsc_drv_obj->base.dev_rm(dev); |
bef4a34a | 457 | |
795b613d S |
458 | if (host_dev->request_pool) { |
459 | kmem_cache_destroy(host_dev->request_pool); | |
460 | host_dev->request_pool = NULL; | |
bef4a34a HJ |
461 | } |
462 | ||
463 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
464 | scsi_remove_host(host); | |
465 | ||
466 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
467 | scsi_host_put(host); | |
1c8d0b7d | 468 | return 0; |
bef4a34a HJ |
469 | } |
470 | ||
3e189519 | 471 | /* |
ff568d3a GKH |
472 | * storvsc_commmand_completion - Command completion processing |
473 | */ | |
0b3f6834 | 474 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 475 | { |
ff568d3a | 476 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 477 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 478 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
795b613d | 479 | struct hv_host_device *host_dev = |
972621c9 | 480 | (struct hv_host_device *)scmnd->device->host->hostdata; |
bef4a34a | 481 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 482 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 483 | struct vmscsi_request *vm_srb; |
bef4a34a | 484 | |
b856e738 BP |
485 | /* ASSERT(request == &cmd_request->request); */ |
486 | /* ASSERT(scmnd); */ | |
487 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
488 | /* (unsigned long)cmd_request); */ | |
489 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 490 | |
ff568d3a GKH |
491 | if (cmd_request->bounce_sgl_count) { |
492 | /* using bounce buffer */ | |
454f18a9 | 493 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 494 | |
454f18a9 | 495 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
496 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
497 | cmd_request->bounce_sgl, | |
498 | scsi_sg_count(scmnd)); | |
499 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
500 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
501 | } |
502 | ||
d7a1bdb9 | 503 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 504 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 505 | |
ff568d3a GKH |
506 | if (scmnd->result) { |
507 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 508 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 509 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
510 | } |
511 | ||
8a046024 HJ |
512 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
513 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 514 | request->data_buffer.len - |
e9e936c6 | 515 | vm_srb->data_transfer_length); |
bef4a34a HJ |
516 | |
517 | scsi_done_fn = scmnd->scsi_done; | |
518 | ||
519 | scmnd->host_scribble = NULL; | |
520 | scmnd->scsi_done = NULL; | |
521 | ||
454f18a9 | 522 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
523 | scsi_done_fn(scmnd); |
524 | ||
795b613d | 525 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
526 | } |
527 | ||
ff568d3a GKH |
528 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
529 | unsigned int sg_count, | |
530 | unsigned int len) | |
bef4a34a HJ |
531 | { |
532 | int i; | |
ff568d3a GKH |
533 | int num_pages; |
534 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
535 | struct page *page_buf; |
536 | ||
73509681 | 537 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 538 | |
06da0bc8 | 539 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 540 | if (!bounce_sgl) |
bef4a34a | 541 | return NULL; |
bef4a34a | 542 | |
ff568d3a | 543 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
544 | page_buf = alloc_page(GFP_ATOMIC); |
545 | if (!page_buf) | |
bef4a34a | 546 | goto cleanup; |
bef4a34a | 547 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
548 | } |
549 | ||
550 | return bounce_sgl; | |
551 | ||
552 | cleanup: | |
553 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
554 | return NULL; | |
555 | } | |
556 | ||
454f18a9 | 557 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
558 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
559 | struct scatterlist *bounce_sgl, | |
560 | unsigned int orig_sgl_count) | |
bef4a34a | 561 | { |
ff568d3a GKH |
562 | int i; |
563 | int j = 0; | |
bef4a34a HJ |
564 | unsigned long src, dest; |
565 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
566 | unsigned int total_copied = 0; |
567 | unsigned long bounce_addr = 0; | |
568 | unsigned long src_addr = 0; | |
bef4a34a HJ |
569 | unsigned long flags; |
570 | ||
571 | local_irq_save(flags); | |
572 | ||
ff568d3a GKH |
573 | for (i = 0; i < orig_sgl_count; i++) { |
574 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
575 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
576 | src = src_addr; |
577 | srclen = orig_sgl[i].length; | |
578 | ||
b856e738 | 579 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 580 | |
0c47a70a | 581 | if (bounce_addr == 0) |
bef4a34a | 582 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 583 | |
ff568d3a | 584 | while (srclen) { |
454f18a9 | 585 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
586 | dest = bounce_addr + bounce_sgl[j].length; |
587 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
588 | ||
fc6a4b26 | 589 | copylen = min(srclen, destlen); |
ff568d3a | 590 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
591 | |
592 | total_copied += copylen; | |
593 | bounce_sgl[j].length += copylen; | |
594 | srclen -= copylen; | |
595 | src += copylen; | |
596 | ||
ff568d3a GKH |
597 | if (bounce_sgl[j].length == PAGE_SIZE) { |
598 | /* full..move to next entry */ | |
599 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
600 | j++; |
601 | ||
454f18a9 | 602 | /* if we need to use another bounce buffer */ |
ff568d3a | 603 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 604 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
605 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
606 | /* unmap the last bounce that is < PAGE_SIZE */ | |
607 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
608 | } |
609 | } | |
610 | ||
ff568d3a | 611 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
612 | } |
613 | ||
614 | local_irq_restore(flags); | |
615 | ||
616 | return total_copied; | |
617 | } | |
618 | ||
454f18a9 | 619 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
620 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
621 | struct scatterlist *bounce_sgl, | |
622 | unsigned int orig_sgl_count) | |
bef4a34a | 623 | { |
ff568d3a GKH |
624 | int i; |
625 | int j = 0; | |
bef4a34a HJ |
626 | unsigned long src, dest; |
627 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
628 | unsigned int total_copied = 0; |
629 | unsigned long bounce_addr = 0; | |
630 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
631 | unsigned long flags; |
632 | ||
633 | local_irq_save(flags); | |
634 | ||
ff568d3a GKH |
635 | for (i = 0; i < orig_sgl_count; i++) { |
636 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
637 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
638 | dest = dest_addr; |
639 | destlen = orig_sgl[i].length; | |
b856e738 | 640 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 641 | |
0c47a70a | 642 | if (bounce_addr == 0) |
bef4a34a | 643 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 644 | |
ff568d3a | 645 | while (destlen) { |
bef4a34a HJ |
646 | src = bounce_addr + bounce_sgl[j].offset; |
647 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
648 | ||
fc6a4b26 | 649 | copylen = min(srclen, destlen); |
ff568d3a | 650 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
651 | |
652 | total_copied += copylen; | |
653 | bounce_sgl[j].offset += copylen; | |
654 | destlen -= copylen; | |
655 | dest += copylen; | |
656 | ||
ff568d3a GKH |
657 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
658 | /* full */ | |
659 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
660 | j++; |
661 | ||
454f18a9 | 662 | /* if we need to use another bounce buffer */ |
ff568d3a | 663 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 664 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
665 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
666 | /* unmap the last bounce that is < PAGE_SIZE */ | |
667 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
668 | } |
669 | } | |
670 | ||
ff568d3a GKH |
671 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
672 | KM_IRQ0); | |
bef4a34a HJ |
673 | } |
674 | ||
675 | local_irq_restore(flags); | |
676 | ||
677 | return total_copied; | |
678 | } | |
679 | ||
3e189519 | 680 | /* |
ff568d3a GKH |
681 | * storvsc_queuecommand - Initiate command processing |
682 | */ | |
f281233d | 683 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 684 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 685 | { |
ff568d3a | 686 | int ret; |
795b613d | 687 | struct hv_host_device *host_dev = |
972621c9 | 688 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 689 | struct hv_device *dev = host_dev->dev; |
2e79505d | 690 | struct storvsc_driver *storvsc_drv_obj = |
c2ad4830 | 691 | drv_to_stordrv(dev->device.driver); |
0b3f6834 | 692 | struct hv_storvsc_request *request; |
bef4a34a | 693 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 694 | unsigned int request_size = 0; |
bef4a34a HJ |
695 | int i; |
696 | struct scatterlist *sgl; | |
77c5ceaf | 697 | unsigned int sg_count = 0; |
12fbd416 | 698 | struct vmscsi_request *vm_srb; |
bef4a34a | 699 | |
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) { | |
bef4a34a HJ |
723 | scmnd->scsi_done = NULL; |
724 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
725 | } | |
726 | ||
454f18a9 | 727 | /* Setup the cmd request */ |
bef4a34a HJ |
728 | cmd_request->bounce_sgl_count = 0; |
729 | cmd_request->bounce_sgl = NULL; | |
730 | cmd_request->cmd = scmnd; | |
731 | ||
ff568d3a | 732 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
733 | |
734 | request = &cmd_request->request; | |
d7a1bdb9 | 735 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 736 | |
bef4a34a | 737 | |
454f18a9 | 738 | /* Build the SRB */ |
ff568d3a | 739 | switch (scmnd->sc_data_direction) { |
bef4a34a | 740 | case DMA_TO_DEVICE: |
12fbd416 | 741 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
742 | break; |
743 | case DMA_FROM_DEVICE: | |
12fbd416 | 744 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
745 | break; |
746 | default: | |
12fbd416 | 747 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
748 | break; |
749 | } | |
750 | ||
d7a1bdb9 S |
751 | request->on_io_completion = storvsc_commmand_completion; |
752 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 753 | |
454f18a9 | 754 | /* request->PortId = scmnd->device->channel; */ |
795b613d | 755 | vm_srb->port_number = host_dev->port; |
735625fe | 756 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 757 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 758 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 759 | |
b856e738 | 760 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 761 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
762 | |
763 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 764 | |
d7a1bdb9 | 765 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
766 | |
767 | ||
d7a1bdb9 | 768 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
769 | if (scsi_sg_count(scmnd)) { |
770 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 771 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 772 | |
454f18a9 | 773 | /* check if we need to bounce the sgl */ |
ff568d3a | 774 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
ff568d3a GKH |
775 | cmd_request->bounce_sgl = |
776 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
777 | scsi_bufflen(scmnd)); | |
778 | if (!cmd_request->bounce_sgl) { | |
bef4a34a HJ |
779 | scmnd->scsi_done = NULL; |
780 | scmnd->host_scribble = NULL; | |
795b613d | 781 | kmem_cache_free(host_dev->request_pool, |
ff568d3a | 782 | cmd_request); |
bef4a34a HJ |
783 | |
784 | return SCSI_MLQUEUE_HOST_BUSY; | |
785 | } | |
786 | ||
ff568d3a | 787 | cmd_request->bounce_sgl_count = |
73509681 | 788 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 789 | PAGE_SHIFT; |
bef4a34a | 790 | |
ff568d3a GKH |
791 | /* |
792 | * FIXME: We can optimize on reads by just skipping | |
793 | * this | |
794 | */ | |
795 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
796 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
797 | |
798 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 799 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
800 | } |
801 | ||
d7a1bdb9 | 802 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 803 | |
f8feed06 | 804 | for (i = 0; i < sg_count; i++) |
d7a1bdb9 | 805 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 806 | page_to_pfn(sg_page((&sgl[i]))); |
f8feed06 | 807 | |
ff568d3a | 808 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 809 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 810 | request->data_buffer.offset = |
ff568d3a | 811 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 812 | request->data_buffer.pfn_array[0] = |
ff568d3a | 813 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 814 | } |
bef4a34a HJ |
815 | |
816 | retry_request: | |
454f18a9 | 817 | /* Invokes the vsc to start an IO */ |
c2ad4830 | 818 | ret = storvsc_drv_obj->on_io_request(dev, |
ff568d3a GKH |
819 | &cmd_request->request); |
820 | if (ret == -1) { | |
821 | /* no more space */ | |
ff568d3a GKH |
822 | |
823 | if (cmd_request->bounce_sgl_count) { | |
824 | /* | |
825 | * FIXME: We can optimize on writes by just skipping | |
826 | * this | |
827 | */ | |
828 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
829 | cmd_request->bounce_sgl, | |
830 | scsi_sg_count(scmnd)); | |
831 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
832 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
833 | } |
834 | ||
795b613d | 835 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
836 | |
837 | scmnd->scsi_done = NULL; | |
838 | scmnd->host_scribble = NULL; | |
839 | ||
840 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
841 | } | |
842 | ||
bef4a34a HJ |
843 | return ret; |
844 | } | |
845 | ||
f281233d JG |
846 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
847 | ||
3e189519 | 848 | /* |
ff568d3a GKH |
849 | * storvsc_host_reset_handler - Reset the scsi HBA |
850 | */ | |
bef4a34a HJ |
851 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
852 | { | |
ff568d3a | 853 | int ret; |
795b613d | 854 | struct hv_host_device *host_dev = |
972621c9 | 855 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 856 | struct hv_device *dev = host_dev->dev; |
bef4a34a | 857 | |
ff568d3a | 858 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
c2ad4830 | 859 | scmnd->device, dev); |
bef4a34a | 860 | |
454f18a9 | 861 | /* Invokes the vsc to reset the host/bus */ |
c2ad4830 | 862 | ret = stor_vsc_on_host_reset(dev); |
83c720ea | 863 | if (ret != 0) |
bef4a34a | 864 | return ret; |
bef4a34a | 865 | |
ff568d3a | 866 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
c2ad4830 | 867 | scmnd->device, dev); |
bef4a34a | 868 | |
bef4a34a HJ |
869 | return ret; |
870 | } | |
871 | ||
ff568d3a GKH |
872 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
873 | sector_t capacity, int *info) | |
bef4a34a HJ |
874 | { |
875 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
876 | sector_t cylinder_times_heads = 0; |
877 | sector_t temp = 0; | |
bef4a34a | 878 | |
ff568d3a GKH |
879 | int sectors_per_track = 0; |
880 | int heads = 0; | |
881 | int cylinders = 0; | |
882 | int rem = 0; | |
bef4a34a | 883 | |
ff568d3a GKH |
884 | if (total_sectors > (65535 * 16 * 255)) |
885 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 886 | |
ff568d3a GKH |
887 | if (total_sectors >= (65535 * 16 * 63)) { |
888 | sectors_per_track = 255; | |
889 | heads = 16; | |
bef4a34a HJ |
890 | |
891 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
892 | /* sector_div stores the quotient in cylinder_times_heads */ |
893 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
894 | } else { | |
895 | sectors_per_track = 17; | |
bef4a34a HJ |
896 | |
897 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
898 | /* sector_div stores the quotient in cylinder_times_heads */ |
899 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
900 | |
901 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
902 | /* sector_div stores the quotient in temp */ |
903 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
904 | |
905 | heads = temp; | |
906 | ||
ff568d3a GKH |
907 | if (heads < 4) |
908 | heads = 4; | |
bef4a34a | 909 | |
ff568d3a GKH |
910 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
911 | sectors_per_track = 31; | |
912 | heads = 16; | |
bef4a34a HJ |
913 | |
914 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
915 | /* |
916 | * sector_div stores the quotient in | |
917 | * cylinder_times_heads | |
918 | */ | |
919 | rem = sector_div(cylinder_times_heads, | |
920 | sectors_per_track); | |
921 | } | |
bef4a34a | 922 | |
ff568d3a GKH |
923 | if (cylinder_times_heads >= (heads * 1024)) { |
924 | sectors_per_track = 63; | |
925 | heads = 16; | |
bef4a34a HJ |
926 | |
927 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
928 | /* |
929 | * sector_div stores the quotient in | |
930 | * cylinder_times_heads | |
931 | */ | |
932 | rem = sector_div(cylinder_times_heads, | |
933 | sectors_per_track); | |
934 | } | |
935 | } | |
bef4a34a HJ |
936 | |
937 | temp = cylinder_times_heads; | |
ff568d3a GKH |
938 | /* sector_div stores the quotient in temp */ |
939 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
940 | cylinders = temp; |
941 | ||
942 | info[0] = heads; | |
ff568d3a GKH |
943 | info[1] = sectors_per_track; |
944 | info[2] = cylinders; | |
bef4a34a | 945 | |
ff568d3a GKH |
946 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
947 | sectors_per_track); | |
bef4a34a HJ |
948 | |
949 | return 0; | |
950 | } | |
951 | ||
bef4a34a HJ |
952 | static int __init storvsc_init(void) |
953 | { | |
954 | int ret; | |
955 | ||
bef4a34a | 956 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 957 | ret = storvsc_drv_init(); |
bef4a34a HJ |
958 | return ret; |
959 | } | |
960 | ||
961 | static void __exit storvsc_exit(void) | |
962 | { | |
bef4a34a | 963 | storvsc_drv_exit(); |
bef4a34a HJ |
964 | } |
965 | ||
ff568d3a | 966 | MODULE_LICENSE("GPL"); |
26c14cc1 | 967 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 968 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
969 | module_init(storvsc_init); |
970 | module_exit(storvsc_exit); |