Commit | Line | Data |
---|---|---|
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 | ||
454f18a9 | 132 | /* Static decl */ |
9efd21e1 | 133 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 134 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a HJ |
135 | static int storvsc_device_configure(struct scsi_device *); |
136 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
415b023a | 137 | static int storvsc_remove(struct hv_device *dev); |
bef4a34a | 138 | |
ff568d3a GKH |
139 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
140 | unsigned int sg_count, | |
141 | unsigned int len); | |
142 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
143 | unsigned int sg_count); | |
bef4a34a | 144 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
145 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
146 | struct scatterlist *bounce_sgl, | |
147 | unsigned int orig_sgl_count); | |
148 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
149 | struct scatterlist *bounce_sgl, | |
150 | unsigned int orig_sgl_count); | |
bef4a34a | 151 | |
ff568d3a GKH |
152 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
153 | sector_t capacity, int *info); | |
bef4a34a HJ |
154 | |
155 | ||
156 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
157 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
158 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 159 | |
454f18a9 | 160 | /* The one and only one */ |
2e79505d | 161 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 162 | |
454f18a9 | 163 | /* Scsi driver */ |
bef4a34a | 164 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
165 | .module = THIS_MODULE, |
166 | .name = "storvsc_host_t", | |
167 | .bios_param = storvsc_get_chs, | |
168 | .queuecommand = storvsc_queuecommand, | |
169 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
170 | .slave_alloc = storvsc_device_alloc, | |
171 | .slave_configure = storvsc_device_configure, | |
172 | .cmd_per_lun = 1, | |
173 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 174 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 175 | .this_id = -1, |
454f18a9 | 176 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
177 | /* currently 32 */ |
178 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
179 | /* | |
180 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
181 | * into 1 sg element. If set, we must limit the max_segment_size to | |
182 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
183 | * multiple | |
184 | */ | |
454f18a9 | 185 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 186 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 187 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 188 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
189 | }; |
190 | ||
191 | ||
3e189519 | 192 | /* |
ff568d3a GKH |
193 | * storvsc_drv_init - StorVsc driver initialization. |
194 | */ | |
db085777 | 195 | static int storvsc_drv_init(void) |
bef4a34a | 196 | { |
ff568d3a | 197 | int ret; |
2e79505d | 198 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 199 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 200 | |
8a046024 | 201 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 202 | |
454f18a9 | 203 | /* Callback to client driver to complete the initialization */ |
db085777 | 204 | stor_vsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 205 | |
ff568d3a | 206 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 207 | "max outstanding reqs %u", |
8a046024 | 208 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 209 | |
8a046024 | 210 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
f8feed06 | 211 | STORVSC_MAX_IO_REQUESTS) |
bef4a34a | 212 | return -1; |
bef4a34a | 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); | |
f8feed06 | 236 | if (!stor_device) |
af3043c6 | 237 | return -1; |
af3043c6 S |
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); | |
f8feed06 | 253 | if (ret != 0) |
af3043c6 | 254 | goto cleanup; |
af3043c6 | 255 | |
93958465 S |
256 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
257 | if (t == 0) { | |
af3043c6 S |
258 | ret = -ETIMEDOUT; |
259 | goto cleanup; | |
260 | } | |
261 | ||
262 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
263 | ||
264 | /* | |
265 | * At this point, all outstanding requests in the adapter | |
266 | * should have been flushed out and return to us | |
267 | */ | |
268 | ||
269 | cleanup: | |
270 | put_stor_device(device); | |
271 | return ret; | |
272 | } | |
273 | ||
bef4a34a HJ |
274 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
275 | { | |
276 | struct device **curr = (struct device **)data; | |
277 | *curr = dev; | |
454f18a9 | 278 | return 1; /* stop iterating */ |
bef4a34a HJ |
279 | } |
280 | ||
bd1de709 | 281 | static void storvsc_drv_exit(void) |
bef4a34a | 282 | { |
2e79505d | 283 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 284 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 285 | struct device *current_dev = NULL; |
2295ba2e | 286 | int ret; |
bef4a34a | 287 | |
ff568d3a | 288 | while (1) { |
bef4a34a HJ |
289 | current_dev = NULL; |
290 | ||
454f18a9 | 291 | /* Get the device */ |
150f9398 | 292 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
293 | (void *) ¤t_dev, |
294 | storvsc_drv_exit_cb); | |
295 | ||
bef4a34a HJ |
296 | |
297 | if (current_dev == NULL) | |
298 | break; | |
299 | ||
454f18a9 | 300 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
301 | device_unregister(current_dev); |
302 | } | |
303 | ||
ca623ad3 HZ |
304 | if (storvsc_drv_obj->base.cleanup) |
305 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 306 | |
150f9398 | 307 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
308 | return; |
309 | } | |
310 | ||
3e189519 | 311 | /* |
ff568d3a GKH |
312 | * storvsc_probe - Add a new device for this driver |
313 | */ | |
9efd21e1 | 314 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 315 | { |
ff568d3a | 316 | int ret; |
2e79505d | 317 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 318 | drv_to_stordrv(device->device.driver); |
bef4a34a | 319 | struct Scsi_Host *host; |
795b613d | 320 | struct hv_host_device *host_dev; |
9f0c7d2c | 321 | struct storvsc_device_info device_info; |
bef4a34a | 322 | |
ca623ad3 | 323 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
324 | return -1; |
325 | ||
ff568d3a | 326 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 327 | sizeof(struct hv_host_device)); |
f8feed06 | 328 | if (!host) |
bef4a34a | 329 | return -ENOMEM; |
bef4a34a | 330 | |
9efd21e1 | 331 | dev_set_drvdata(&device->device, host); |
bef4a34a | 332 | |
795b613d S |
333 | host_dev = (struct hv_host_device *)host->hostdata; |
334 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 335 | |
795b613d | 336 | host_dev->port = host->host_no; |
97c15296 | 337 | host_dev->dev = device; |
bef4a34a | 338 | |
795b613d | 339 | host_dev->request_pool = |
9efd21e1 | 340 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 341 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
342 | SLAB_HWCACHE_ALIGN, NULL); |
343 | ||
795b613d | 344 | if (!host_dev->request_pool) { |
bef4a34a | 345 | scsi_host_put(host); |
bef4a34a HJ |
346 | return -ENOMEM; |
347 | } | |
348 | ||
8a046024 | 349 | device_info.port_number = host->host_no; |
454f18a9 | 350 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
351 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
352 | ||
ff568d3a | 353 | if (ret != 0) { |
795b613d | 354 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 355 | scsi_host_put(host); |
bef4a34a HJ |
356 | return -1; |
357 | } | |
358 | ||
795b613d S |
359 | host_dev->path = device_info.path_id; |
360 | host_dev->target = device_info.target_id; | |
bef4a34a | 361 | |
ff568d3a GKH |
362 | /* max # of devices per target */ |
363 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
364 | /* max # of targets per channel */ | |
365 | host->max_id = STORVSC_MAX_TARGETS; | |
366 | /* max # of channels */ | |
367 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 368 | |
454f18a9 | 369 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 370 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 371 | if (ret != 0) { |
bef4a34a | 372 | |
9efd21e1 | 373 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a | 374 | |
795b613d | 375 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 376 | scsi_host_put(host); |
bef4a34a HJ |
377 | return -1; |
378 | } | |
379 | ||
380 | scsi_scan_host(host); | |
bef4a34a HJ |
381 | return ret; |
382 | } | |
383 | ||
3e189519 | 384 | /* |
ff568d3a GKH |
385 | * storvsc_remove - Callback when our device is removed |
386 | */ | |
415b023a | 387 | static int storvsc_remove(struct hv_device *dev) |
bef4a34a | 388 | { |
2e79505d | 389 | struct storvsc_driver *storvsc_drv_obj = |
415b023a S |
390 | drv_to_stordrv(dev->device.driver); |
391 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
795b613d | 392 | struct hv_host_device *host_dev = |
972621c9 | 393 | (struct hv_host_device *)host->hostdata; |
bef4a34a | 394 | |
ff568d3a GKH |
395 | /* |
396 | * Call to the vsc driver to let it know that the device is being | |
397 | * removed | |
398 | */ | |
415b023a | 399 | storvsc_drv_obj->base.dev_rm(dev); |
bef4a34a | 400 | |
795b613d S |
401 | if (host_dev->request_pool) { |
402 | kmem_cache_destroy(host_dev->request_pool); | |
403 | host_dev->request_pool = NULL; | |
bef4a34a HJ |
404 | } |
405 | ||
406 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
407 | scsi_remove_host(host); | |
408 | ||
409 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
410 | scsi_host_put(host); | |
1c8d0b7d | 411 | return 0; |
bef4a34a HJ |
412 | } |
413 | ||
3e189519 | 414 | /* |
ff568d3a GKH |
415 | * storvsc_commmand_completion - Command completion processing |
416 | */ | |
0b3f6834 | 417 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 418 | { |
ff568d3a | 419 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 420 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 421 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
795b613d | 422 | struct hv_host_device *host_dev = |
972621c9 | 423 | (struct hv_host_device *)scmnd->device->host->hostdata; |
bef4a34a | 424 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 425 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 426 | struct vmscsi_request *vm_srb; |
bef4a34a | 427 | |
b856e738 BP |
428 | /* ASSERT(request == &cmd_request->request); */ |
429 | /* ASSERT(scmnd); */ | |
430 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
431 | /* (unsigned long)cmd_request); */ | |
432 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 433 | |
ff568d3a GKH |
434 | if (cmd_request->bounce_sgl_count) { |
435 | /* using bounce buffer */ | |
454f18a9 | 436 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 437 | |
454f18a9 | 438 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
439 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
440 | cmd_request->bounce_sgl, | |
441 | scsi_sg_count(scmnd)); | |
442 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
443 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
444 | } |
445 | ||
d7a1bdb9 | 446 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 447 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 448 | |
ff568d3a GKH |
449 | if (scmnd->result) { |
450 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 451 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 452 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
453 | } |
454 | ||
8a046024 HJ |
455 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
456 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 457 | request->data_buffer.len - |
e9e936c6 | 458 | vm_srb->data_transfer_length); |
bef4a34a HJ |
459 | |
460 | scsi_done_fn = scmnd->scsi_done; | |
461 | ||
462 | scmnd->host_scribble = NULL; | |
463 | scmnd->scsi_done = NULL; | |
464 | ||
454f18a9 | 465 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
466 | scsi_done_fn(scmnd); |
467 | ||
795b613d | 468 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
469 | } |
470 | ||
471 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
472 | { | |
ff568d3a | 473 | int i; |
bef4a34a | 474 | |
454f18a9 | 475 | /* No need to check */ |
bef4a34a HJ |
476 | if (sg_count < 2) |
477 | return -1; | |
478 | ||
454f18a9 | 479 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
480 | for (i = 0; i < sg_count; i++) { |
481 | if (i == 0) { | |
482 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
483 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
484 | return i; | |
ff568d3a GKH |
485 | } else if (i == sg_count - 1) { |
486 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
487 | if (sgl[i].offset != 0) |
488 | return i; | |
ff568d3a GKH |
489 | } else { |
490 | /* make sure no hole in the middle */ | |
bef4a34a | 491 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 492 | return i; |
bef4a34a HJ |
493 | } |
494 | } | |
495 | return -1; | |
496 | } | |
497 | ||
ff568d3a GKH |
498 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
499 | unsigned int sg_count, | |
500 | unsigned int len) | |
bef4a34a HJ |
501 | { |
502 | int i; | |
ff568d3a GKH |
503 | int num_pages; |
504 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
505 | struct page *page_buf; |
506 | ||
73509681 | 507 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 508 | |
06da0bc8 | 509 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 510 | if (!bounce_sgl) |
bef4a34a | 511 | return NULL; |
bef4a34a | 512 | |
ff568d3a | 513 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
514 | page_buf = alloc_page(GFP_ATOMIC); |
515 | if (!page_buf) | |
bef4a34a | 516 | goto cleanup; |
bef4a34a | 517 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
518 | } |
519 | ||
520 | return bounce_sgl; | |
521 | ||
522 | cleanup: | |
523 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
524 | return NULL; | |
525 | } | |
526 | ||
ff568d3a GKH |
527 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
528 | unsigned int sg_count) | |
bef4a34a HJ |
529 | { |
530 | int i; | |
531 | struct page *page_buf; | |
532 | ||
ff568d3a GKH |
533 | for (i = 0; i < sg_count; i++) { |
534 | page_buf = sg_page((&sgl[i])); | |
535 | if (page_buf != NULL) | |
bef4a34a | 536 | __free_page(page_buf); |
bef4a34a HJ |
537 | } |
538 | ||
539 | kfree(sgl); | |
540 | } | |
541 | ||
454f18a9 | 542 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
543 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
544 | struct scatterlist *bounce_sgl, | |
545 | unsigned int orig_sgl_count) | |
bef4a34a | 546 | { |
ff568d3a GKH |
547 | int i; |
548 | int j = 0; | |
bef4a34a HJ |
549 | unsigned long src, dest; |
550 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
551 | unsigned int total_copied = 0; |
552 | unsigned long bounce_addr = 0; | |
553 | unsigned long src_addr = 0; | |
bef4a34a HJ |
554 | unsigned long flags; |
555 | ||
556 | local_irq_save(flags); | |
557 | ||
ff568d3a GKH |
558 | for (i = 0; i < orig_sgl_count; i++) { |
559 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
560 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
561 | src = src_addr; |
562 | srclen = orig_sgl[i].length; | |
563 | ||
b856e738 | 564 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 565 | |
0c47a70a | 566 | if (bounce_addr == 0) |
bef4a34a | 567 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 568 | |
ff568d3a | 569 | while (srclen) { |
454f18a9 | 570 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
571 | dest = bounce_addr + bounce_sgl[j].length; |
572 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
573 | ||
fc6a4b26 | 574 | copylen = min(srclen, destlen); |
ff568d3a | 575 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
576 | |
577 | total_copied += copylen; | |
578 | bounce_sgl[j].length += copylen; | |
579 | srclen -= copylen; | |
580 | src += copylen; | |
581 | ||
ff568d3a GKH |
582 | if (bounce_sgl[j].length == PAGE_SIZE) { |
583 | /* full..move to next entry */ | |
584 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
585 | j++; |
586 | ||
454f18a9 | 587 | /* if we need to use another bounce buffer */ |
ff568d3a | 588 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 589 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
590 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
591 | /* unmap the last bounce that is < PAGE_SIZE */ | |
592 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
593 | } |
594 | } | |
595 | ||
ff568d3a | 596 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
597 | } |
598 | ||
599 | local_irq_restore(flags); | |
600 | ||
601 | return total_copied; | |
602 | } | |
603 | ||
454f18a9 | 604 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
605 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
606 | struct scatterlist *bounce_sgl, | |
607 | unsigned int orig_sgl_count) | |
bef4a34a | 608 | { |
ff568d3a GKH |
609 | int i; |
610 | int j = 0; | |
bef4a34a HJ |
611 | unsigned long src, dest; |
612 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
613 | unsigned int total_copied = 0; |
614 | unsigned long bounce_addr = 0; | |
615 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
616 | unsigned long flags; |
617 | ||
618 | local_irq_save(flags); | |
619 | ||
ff568d3a GKH |
620 | for (i = 0; i < orig_sgl_count; i++) { |
621 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
622 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
623 | dest = dest_addr; |
624 | destlen = orig_sgl[i].length; | |
b856e738 | 625 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 626 | |
0c47a70a | 627 | if (bounce_addr == 0) |
bef4a34a | 628 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 629 | |
ff568d3a | 630 | while (destlen) { |
bef4a34a HJ |
631 | src = bounce_addr + bounce_sgl[j].offset; |
632 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
633 | ||
fc6a4b26 | 634 | copylen = min(srclen, destlen); |
ff568d3a | 635 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
636 | |
637 | total_copied += copylen; | |
638 | bounce_sgl[j].offset += copylen; | |
639 | destlen -= copylen; | |
640 | dest += copylen; | |
641 | ||
ff568d3a GKH |
642 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
643 | /* full */ | |
644 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
645 | j++; |
646 | ||
454f18a9 | 647 | /* if we need to use another bounce buffer */ |
ff568d3a | 648 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 649 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
650 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
651 | /* unmap the last bounce that is < PAGE_SIZE */ | |
652 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
653 | } |
654 | } | |
655 | ||
ff568d3a GKH |
656 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
657 | KM_IRQ0); | |
bef4a34a HJ |
658 | } |
659 | ||
660 | local_irq_restore(flags); | |
661 | ||
662 | return total_copied; | |
663 | } | |
664 | ||
3e189519 | 665 | /* |
ff568d3a GKH |
666 | * storvsc_queuecommand - Initiate command processing |
667 | */ | |
f281233d | 668 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 669 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 670 | { |
ff568d3a | 671 | int ret; |
795b613d | 672 | struct hv_host_device *host_dev = |
972621c9 | 673 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 674 | struct hv_device *dev = host_dev->dev; |
2e79505d | 675 | struct storvsc_driver *storvsc_drv_obj = |
c2ad4830 | 676 | drv_to_stordrv(dev->device.driver); |
0b3f6834 | 677 | struct hv_storvsc_request *request; |
bef4a34a | 678 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 679 | unsigned int request_size = 0; |
bef4a34a HJ |
680 | int i; |
681 | struct scatterlist *sgl; | |
77c5ceaf | 682 | unsigned int sg_count = 0; |
12fbd416 | 683 | struct vmscsi_request *vm_srb; |
bef4a34a | 684 | |
bef4a34a | 685 | |
454f18a9 | 686 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 687 | if (scmnd->host_scribble) { |
b856e738 | 688 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 689 | |
ff568d3a GKH |
690 | cmd_request = |
691 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
692 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
693 | scmnd, cmd_request); | |
bef4a34a HJ |
694 | |
695 | goto retry_request; | |
696 | } | |
697 | ||
b856e738 BP |
698 | /* ASSERT(scmnd->scsi_done == NULL); */ |
699 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
700 | |
701 | scmnd->scsi_done = done; | |
702 | ||
703 | request_size = sizeof(struct storvsc_cmd_request); | |
704 | ||
795b613d | 705 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
ff568d3a GKH |
706 | GFP_ATOMIC); |
707 | if (!cmd_request) { | |
bef4a34a HJ |
708 | scmnd->scsi_done = NULL; |
709 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
710 | } | |
711 | ||
454f18a9 | 712 | /* Setup the cmd request */ |
bef4a34a HJ |
713 | cmd_request->bounce_sgl_count = 0; |
714 | cmd_request->bounce_sgl = NULL; | |
715 | cmd_request->cmd = scmnd; | |
716 | ||
ff568d3a | 717 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
718 | |
719 | request = &cmd_request->request; | |
d7a1bdb9 | 720 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 721 | |
bef4a34a | 722 | |
454f18a9 | 723 | /* Build the SRB */ |
ff568d3a | 724 | switch (scmnd->sc_data_direction) { |
bef4a34a | 725 | case DMA_TO_DEVICE: |
12fbd416 | 726 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
727 | break; |
728 | case DMA_FROM_DEVICE: | |
12fbd416 | 729 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
730 | break; |
731 | default: | |
12fbd416 | 732 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
733 | break; |
734 | } | |
735 | ||
d7a1bdb9 S |
736 | request->on_io_completion = storvsc_commmand_completion; |
737 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 738 | |
454f18a9 | 739 | /* request->PortId = scmnd->device->channel; */ |
795b613d | 740 | vm_srb->port_number = host_dev->port; |
735625fe | 741 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 742 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 743 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 744 | |
b856e738 | 745 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 746 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
747 | |
748 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 749 | |
d7a1bdb9 | 750 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
751 | |
752 | ||
d7a1bdb9 | 753 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
754 | if (scsi_sg_count(scmnd)) { |
755 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 756 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 757 | |
454f18a9 | 758 | /* check if we need to bounce the sgl */ |
ff568d3a | 759 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
ff568d3a GKH |
760 | cmd_request->bounce_sgl = |
761 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
762 | scsi_bufflen(scmnd)); | |
763 | if (!cmd_request->bounce_sgl) { | |
bef4a34a HJ |
764 | scmnd->scsi_done = NULL; |
765 | scmnd->host_scribble = NULL; | |
795b613d | 766 | kmem_cache_free(host_dev->request_pool, |
ff568d3a | 767 | cmd_request); |
bef4a34a HJ |
768 | |
769 | return SCSI_MLQUEUE_HOST_BUSY; | |
770 | } | |
771 | ||
ff568d3a | 772 | cmd_request->bounce_sgl_count = |
73509681 | 773 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 774 | PAGE_SHIFT; |
bef4a34a | 775 | |
ff568d3a GKH |
776 | /* |
777 | * FIXME: We can optimize on reads by just skipping | |
778 | * this | |
779 | */ | |
780 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
781 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
782 | |
783 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 784 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
785 | } |
786 | ||
d7a1bdb9 | 787 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 788 | |
f8feed06 | 789 | for (i = 0; i < sg_count; i++) |
d7a1bdb9 | 790 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 791 | page_to_pfn(sg_page((&sgl[i]))); |
f8feed06 | 792 | |
ff568d3a | 793 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 794 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 795 | request->data_buffer.offset = |
ff568d3a | 796 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 797 | request->data_buffer.pfn_array[0] = |
ff568d3a | 798 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 799 | } |
bef4a34a HJ |
800 | |
801 | retry_request: | |
454f18a9 | 802 | /* Invokes the vsc to start an IO */ |
c2ad4830 | 803 | ret = storvsc_drv_obj->on_io_request(dev, |
ff568d3a GKH |
804 | &cmd_request->request); |
805 | if (ret == -1) { | |
806 | /* no more space */ | |
ff568d3a GKH |
807 | |
808 | if (cmd_request->bounce_sgl_count) { | |
809 | /* | |
810 | * FIXME: We can optimize on writes by just skipping | |
811 | * this | |
812 | */ | |
813 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
814 | cmd_request->bounce_sgl, | |
815 | scsi_sg_count(scmnd)); | |
816 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
817 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
818 | } |
819 | ||
795b613d | 820 | kmem_cache_free(host_dev->request_pool, cmd_request); |
bef4a34a HJ |
821 | |
822 | scmnd->scsi_done = NULL; | |
823 | scmnd->host_scribble = NULL; | |
824 | ||
825 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
826 | } | |
827 | ||
bef4a34a HJ |
828 | return ret; |
829 | } | |
830 | ||
f281233d JG |
831 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
832 | ||
bef4a34a HJ |
833 | static int storvsc_device_configure(struct scsi_device *sdevice) |
834 | { | |
ff568d3a GKH |
835 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, |
836 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 837 | |
ff568d3a GKH |
838 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
839 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
840 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
841 | ||
ff568d3a GKH |
842 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
843 | sdevice); | |
bef4a34a HJ |
844 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
845 | ||
846 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 847 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
848 | |
849 | return 0; | |
850 | } | |
851 | ||
3e189519 | 852 | /* |
ff568d3a GKH |
853 | * storvsc_host_reset_handler - Reset the scsi HBA |
854 | */ | |
bef4a34a HJ |
855 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
856 | { | |
ff568d3a | 857 | int ret; |
795b613d | 858 | struct hv_host_device *host_dev = |
972621c9 | 859 | (struct hv_host_device *)scmnd->device->host->hostdata; |
c2ad4830 | 860 | struct hv_device *dev = host_dev->dev; |
bef4a34a | 861 | |
ff568d3a | 862 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
c2ad4830 | 863 | scmnd->device, dev); |
bef4a34a | 864 | |
454f18a9 | 865 | /* Invokes the vsc to reset the host/bus */ |
c2ad4830 | 866 | ret = stor_vsc_on_host_reset(dev); |
83c720ea | 867 | if (ret != 0) |
bef4a34a | 868 | return ret; |
bef4a34a | 869 | |
ff568d3a | 870 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
c2ad4830 | 871 | scmnd->device, dev); |
bef4a34a | 872 | |
bef4a34a HJ |
873 | return ret; |
874 | } | |
875 | ||
ff568d3a GKH |
876 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
877 | sector_t capacity, int *info) | |
bef4a34a HJ |
878 | { |
879 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
880 | sector_t cylinder_times_heads = 0; |
881 | sector_t temp = 0; | |
bef4a34a | 882 | |
ff568d3a GKH |
883 | int sectors_per_track = 0; |
884 | int heads = 0; | |
885 | int cylinders = 0; | |
886 | int rem = 0; | |
bef4a34a | 887 | |
ff568d3a GKH |
888 | if (total_sectors > (65535 * 16 * 255)) |
889 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 890 | |
ff568d3a GKH |
891 | if (total_sectors >= (65535 * 16 * 63)) { |
892 | sectors_per_track = 255; | |
893 | heads = 16; | |
bef4a34a HJ |
894 | |
895 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
896 | /* sector_div stores the quotient in cylinder_times_heads */ |
897 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
898 | } else { | |
899 | sectors_per_track = 17; | |
bef4a34a HJ |
900 | |
901 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
902 | /* sector_div stores the quotient in cylinder_times_heads */ |
903 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
904 | |
905 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
906 | /* sector_div stores the quotient in temp */ |
907 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
908 | |
909 | heads = temp; | |
910 | ||
ff568d3a GKH |
911 | if (heads < 4) |
912 | heads = 4; | |
bef4a34a | 913 | |
ff568d3a GKH |
914 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
915 | sectors_per_track = 31; | |
916 | heads = 16; | |
bef4a34a HJ |
917 | |
918 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
919 | /* |
920 | * sector_div stores the quotient in | |
921 | * cylinder_times_heads | |
922 | */ | |
923 | rem = sector_div(cylinder_times_heads, | |
924 | sectors_per_track); | |
925 | } | |
bef4a34a | 926 | |
ff568d3a GKH |
927 | if (cylinder_times_heads >= (heads * 1024)) { |
928 | sectors_per_track = 63; | |
929 | heads = 16; | |
bef4a34a HJ |
930 | |
931 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
932 | /* |
933 | * sector_div stores the quotient in | |
934 | * cylinder_times_heads | |
935 | */ | |
936 | rem = sector_div(cylinder_times_heads, | |
937 | sectors_per_track); | |
938 | } | |
939 | } | |
bef4a34a HJ |
940 | |
941 | temp = cylinder_times_heads; | |
ff568d3a GKH |
942 | /* sector_div stores the quotient in temp */ |
943 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
944 | cylinders = temp; |
945 | ||
946 | info[0] = heads; | |
ff568d3a GKH |
947 | info[1] = sectors_per_track; |
948 | info[2] = cylinders; | |
bef4a34a | 949 | |
ff568d3a GKH |
950 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
951 | sectors_per_track); | |
bef4a34a HJ |
952 | |
953 | return 0; | |
954 | } | |
955 | ||
bef4a34a HJ |
956 | static int __init storvsc_init(void) |
957 | { | |
958 | int ret; | |
959 | ||
bef4a34a | 960 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 961 | ret = storvsc_drv_init(); |
bef4a34a HJ |
962 | return ret; |
963 | } | |
964 | ||
965 | static void __exit storvsc_exit(void) | |
966 | { | |
bef4a34a | 967 | storvsc_drv_exit(); |
bef4a34a HJ |
968 | } |
969 | ||
ff568d3a | 970 | MODULE_LICENSE("GPL"); |
26c14cc1 | 971 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 972 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
973 | module_init(storvsc_init); |
974 | module_exit(storvsc_exit); |