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> | |
bef4a34a | 20 | */ |
bef4a34a | 21 | #include <linux/init.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
bef4a34a HJ |
23 | #include <linux/module.h> |
24 | #include <linux/device.h> | |
25 | #include <linux/blkdev.h> | |
bef4a34a HJ |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_cmnd.h> | |
28 | #include <scsi/scsi_host.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 33 | #include <scsi/scsi_dbg.h> |
4983b39a | 34 | #include "osd.h" |
645954c5 | 35 | #include "logging.h" |
2d82f6c7 | 36 | #include "version_info.h" |
870cde80 | 37 | #include "vmbus.h" |
bb969793 | 38 | #include "storvsc_api.h" |
bef4a34a | 39 | |
bef4a34a | 40 | |
bef4a34a | 41 | struct host_device_context { |
ff568d3a GKH |
42 | /* must be 1st field |
43 | * FIXME this is a bug */ | |
ff568d3a | 44 | /* point back to our device context */ |
f916a34d | 45 | struct vm_device *device_ctx; |
ff568d3a GKH |
46 | struct kmem_cache *request_pool; |
47 | unsigned int port; | |
48 | unsigned char path; | |
49 | unsigned char target; | |
bef4a34a HJ |
50 | }; |
51 | ||
52 | struct storvsc_cmd_request { | |
ff568d3a GKH |
53 | struct list_head entry; |
54 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
55 | |
56 | unsigned int bounce_sgl_count; | |
ff568d3a | 57 | struct scatterlist *bounce_sgl; |
bef4a34a | 58 | |
0b3f6834 | 59 | struct hv_storvsc_request request; |
454f18a9 | 60 | /* !!!DO NOT ADD ANYTHING BELOW HERE!!! */ |
ff568d3a GKH |
61 | /* The extension buffer falls right here and is pointed to by |
62 | * request.Extension; | |
63 | * Which sounds like a very bad design... */ | |
bef4a34a HJ |
64 | }; |
65 | ||
66 | struct storvsc_driver_context { | |
454f18a9 | 67 | /* !! These must be the first 2 fields !! */ |
ff568d3a GKH |
68 | /* FIXME this is a bug... */ |
69 | struct driver_context drv_ctx; | |
9f0c7d2c | 70 | struct storvsc_driver_object drv_obj; |
bef4a34a HJ |
71 | }; |
72 | ||
454f18a9 | 73 | /* Static decl */ |
bef4a34a | 74 | static int storvsc_probe(struct device *dev); |
ff568d3a GKH |
75 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, |
76 | void (*done)(struct scsi_cmnd *)); | |
bef4a34a HJ |
77 | static int storvsc_device_alloc(struct scsi_device *); |
78 | static int storvsc_device_configure(struct scsi_device *); | |
79 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
bef4a34a HJ |
80 | static int storvsc_remove(struct device *dev); |
81 | ||
ff568d3a GKH |
82 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
83 | unsigned int sg_count, | |
84 | unsigned int len); | |
85 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
86 | unsigned int sg_count); | |
bef4a34a | 87 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
88 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
89 | struct scatterlist *bounce_sgl, | |
90 | unsigned int orig_sgl_count); | |
91 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
92 | struct scatterlist *bounce_sgl, | |
93 | unsigned int orig_sgl_count); | |
bef4a34a | 94 | |
ff568d3a GKH |
95 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
96 | sector_t capacity, int *info); | |
bef4a34a HJ |
97 | |
98 | ||
99 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
100 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
101 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 102 | |
454f18a9 | 103 | /* The one and only one */ |
bef4a34a HJ |
104 | static struct storvsc_driver_context g_storvsc_drv; |
105 | ||
454f18a9 | 106 | /* Scsi driver */ |
bef4a34a | 107 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
108 | .module = THIS_MODULE, |
109 | .name = "storvsc_host_t", | |
110 | .bios_param = storvsc_get_chs, | |
111 | .queuecommand = storvsc_queuecommand, | |
112 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
113 | .slave_alloc = storvsc_device_alloc, | |
114 | .slave_configure = storvsc_device_configure, | |
115 | .cmd_per_lun = 1, | |
116 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 117 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 118 | .this_id = -1, |
454f18a9 | 119 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
120 | /* currently 32 */ |
121 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
122 | /* | |
123 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
124 | * into 1 sg element. If set, we must limit the max_segment_size to | |
125 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
126 | * multiple | |
127 | */ | |
454f18a9 | 128 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 129 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 130 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 131 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
132 | }; |
133 | ||
134 | ||
3e189519 | 135 | /* |
ff568d3a GKH |
136 | * storvsc_drv_init - StorVsc driver initialization. |
137 | */ | |
21707bed | 138 | static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
bef4a34a | 139 | { |
ff568d3a | 140 | int ret; |
9f0c7d2c | 141 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a | 142 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
bef4a34a HJ |
143 | |
144 | DPRINT_ENTER(STORVSC_DRV); | |
145 | ||
146 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
147 | ||
148 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; | |
bef4a34a | 149 | |
454f18a9 | 150 | /* Callback to client driver to complete the initialization */ |
21707bed | 151 | drv_init(&storvsc_drv_obj->Base); |
bef4a34a | 152 | |
ff568d3a GKH |
153 | DPRINT_INFO(STORVSC_DRV, |
154 | "request extension size %u, max outstanding reqs %u", | |
155 | storvsc_drv_obj->RequestExtSize, | |
156 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
157 | ||
158 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < | |
159 | STORVSC_MAX_IO_REQUESTS) { | |
160 | DPRINT_ERR(STORVSC_DRV, | |
161 | "The number of outstanding io requests (%d) " | |
162 | "is larger than that supported (%d) internally.", | |
163 | STORVSC_MAX_IO_REQUESTS, | |
164 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
bef4a34a HJ |
165 | return -1; |
166 | } | |
167 | ||
168 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
ff568d3a GKH |
169 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
170 | sizeof(struct hv_guid)); | |
bef4a34a | 171 | |
bef4a34a HJ |
172 | drv_ctx->probe = storvsc_probe; |
173 | drv_ctx->remove = storvsc_remove; | |
bef4a34a | 174 | |
454f18a9 | 175 | /* The driver belongs to vmbus */ |
5d48a1c2 | 176 | ret = vmbus_child_driver_register(drv_ctx); |
bef4a34a HJ |
177 | |
178 | DPRINT_EXIT(STORVSC_DRV); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
bef4a34a HJ |
183 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
184 | { | |
185 | struct device **curr = (struct device **)data; | |
186 | *curr = dev; | |
454f18a9 | 187 | return 1; /* stop iterating */ |
bef4a34a HJ |
188 | } |
189 | ||
bd1de709 | 190 | static void storvsc_drv_exit(void) |
bef4a34a | 191 | { |
9f0c7d2c | 192 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a GKH |
193 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
194 | struct device *current_dev = NULL; | |
2295ba2e | 195 | int ret; |
bef4a34a | 196 | |
bef4a34a HJ |
197 | DPRINT_ENTER(STORVSC_DRV); |
198 | ||
ff568d3a | 199 | while (1) { |
bef4a34a HJ |
200 | current_dev = NULL; |
201 | ||
454f18a9 | 202 | /* Get the device */ |
2295ba2e BP |
203 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
204 | (void *) ¤t_dev, | |
205 | storvsc_drv_exit_cb); | |
206 | ||
207 | if (ret) | |
208 | DPRINT_WARN(STORVSC_DRV, | |
209 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
210 | |
211 | if (current_dev == NULL) | |
212 | break; | |
213 | ||
454f18a9 | 214 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
215 | device_unregister(current_dev); |
216 | } | |
217 | ||
218 | if (storvsc_drv_obj->Base.OnCleanup) | |
219 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
220 | ||
221 | vmbus_child_driver_unregister(drv_ctx); | |
222 | ||
223 | DPRINT_EXIT(STORVSC_DRV); | |
224 | ||
225 | return; | |
226 | } | |
227 | ||
3e189519 | 228 | /* |
ff568d3a GKH |
229 | * storvsc_probe - Add a new device for this driver |
230 | */ | |
bef4a34a HJ |
231 | static int storvsc_probe(struct device *device) |
232 | { | |
ff568d3a GKH |
233 | int ret; |
234 | struct driver_context *driver_ctx = | |
235 | driver_to_driver_context(device->driver); | |
236 | struct storvsc_driver_context *storvsc_drv_ctx = | |
237 | (struct storvsc_driver_context *)driver_ctx; | |
238 | struct storvsc_driver_object *storvsc_drv_obj = | |
239 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 240 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 241 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a HJ |
242 | struct Scsi_Host *host; |
243 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 244 | struct storvsc_device_info device_info; |
bef4a34a HJ |
245 | |
246 | DPRINT_ENTER(STORVSC_DRV); | |
247 | ||
248 | if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
249 | return -1; | |
250 | ||
ff568d3a GKH |
251 | host = scsi_host_alloc(&scsi_driver, |
252 | sizeof(struct host_device_context)); | |
253 | if (!host) { | |
bef4a34a HJ |
254 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
255 | return -ENOMEM; | |
256 | } | |
257 | ||
0883c52b | 258 | dev_set_drvdata(device, host); |
bef4a34a | 259 | |
ff568d3a | 260 | host_device_ctx = (struct host_device_context *)host->hostdata; |
bef4a34a HJ |
261 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
262 | ||
263 | host_device_ctx->port = host->host_no; | |
264 | host_device_ctx->device_ctx = device_ctx; | |
265 | ||
bef4a34a | 266 | host_device_ctx->request_pool = |
ff568d3a GKH |
267 | kmem_cache_create(dev_name(&device_ctx->device), |
268 | sizeof(struct storvsc_cmd_request) + | |
269 | storvsc_drv_obj->RequestExtSize, 0, | |
270 | SLAB_HWCACHE_ALIGN, NULL); | |
271 | ||
272 | if (!host_device_ctx->request_pool) { | |
bef4a34a HJ |
273 | scsi_host_put(host); |
274 | DPRINT_EXIT(STORVSC_DRV); | |
275 | ||
276 | return -ENOMEM; | |
277 | } | |
278 | ||
279 | device_info.PortNumber = host->host_no; | |
454f18a9 | 280 | /* Call to the vsc driver to add the device */ |
ff568d3a GKH |
281 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, |
282 | (void *)&device_info); | |
283 | if (ret != 0) { | |
bef4a34a HJ |
284 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
285 | kmem_cache_destroy(host_device_ctx->request_pool); | |
286 | scsi_host_put(host); | |
287 | DPRINT_EXIT(STORVSC_DRV); | |
288 | ||
289 | return -1; | |
290 | } | |
291 | ||
454f18a9 | 292 | /* host_device_ctx->port = device_info.PortNumber; */ |
bef4a34a HJ |
293 | host_device_ctx->path = device_info.PathId; |
294 | host_device_ctx->target = device_info.TargetId; | |
295 | ||
ff568d3a GKH |
296 | /* max # of devices per target */ |
297 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
298 | /* max # of targets per channel */ | |
299 | host->max_id = STORVSC_MAX_TARGETS; | |
300 | /* max # of channels */ | |
301 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 302 | |
454f18a9 | 303 | /* Register the HBA and start the scsi bus scan */ |
bef4a34a | 304 | ret = scsi_add_host(host, device); |
ff568d3a | 305 | if (ret != 0) { |
bef4a34a HJ |
306 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
307 | ||
308 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
309 | ||
310 | kmem_cache_destroy(host_device_ctx->request_pool); | |
311 | scsi_host_put(host); | |
312 | DPRINT_EXIT(STORVSC_DRV); | |
313 | ||
314 | return -1; | |
315 | } | |
316 | ||
317 | scsi_scan_host(host); | |
318 | ||
319 | DPRINT_EXIT(STORVSC_DRV); | |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
3e189519 | 324 | /* |
ff568d3a GKH |
325 | * storvsc_remove - Callback when our device is removed |
326 | */ | |
bef4a34a HJ |
327 | static int storvsc_remove(struct device *device) |
328 | { | |
ff568d3a GKH |
329 | int ret; |
330 | struct driver_context *driver_ctx = | |
331 | driver_to_driver_context(device->driver); | |
332 | struct storvsc_driver_context *storvsc_drv_ctx = | |
333 | (struct storvsc_driver_context *)driver_ctx; | |
334 | struct storvsc_driver_object *storvsc_drv_obj = | |
335 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 336 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 337 | struct hv_device *device_obj = &device_ctx->device_obj; |
0883c52b | 338 | struct Scsi_Host *host = dev_get_drvdata(device); |
ff568d3a GKH |
339 | struct host_device_context *host_device_ctx = |
340 | (struct host_device_context *)host->hostdata; | |
bef4a34a HJ |
341 | |
342 | ||
343 | DPRINT_ENTER(STORVSC_DRV); | |
344 | ||
ff568d3a | 345 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
bef4a34a HJ |
346 | DPRINT_EXIT(STORVSC_DRV); |
347 | return -1; | |
348 | } | |
349 | ||
ff568d3a GKH |
350 | /* |
351 | * Call to the vsc driver to let it know that the device is being | |
352 | * removed | |
353 | */ | |
bef4a34a | 354 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
ff568d3a | 355 | if (ret != 0) { |
454f18a9 | 356 | /* TODO: */ |
ff568d3a GKH |
357 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", |
358 | ret); | |
bef4a34a HJ |
359 | } |
360 | ||
ff568d3a | 361 | if (host_device_ctx->request_pool) { |
bef4a34a HJ |
362 | kmem_cache_destroy(host_device_ctx->request_pool); |
363 | host_device_ctx->request_pool = NULL; | |
364 | } | |
365 | ||
366 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
367 | scsi_remove_host(host); | |
368 | ||
369 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
370 | scsi_host_put(host); | |
371 | ||
372 | DPRINT_EXIT(STORVSC_DRV); | |
373 | ||
374 | return ret; | |
375 | } | |
376 | ||
3e189519 | 377 | /* |
ff568d3a GKH |
378 | * storvsc_commmand_completion - Command completion processing |
379 | */ | |
0b3f6834 | 380 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 381 | { |
ff568d3a GKH |
382 | struct storvsc_cmd_request *cmd_request = |
383 | (struct storvsc_cmd_request *)request->Context; | |
bef4a34a | 384 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
ff568d3a GKH |
385 | struct host_device_context *host_device_ctx = |
386 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 387 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 388 | struct scsi_sense_hdr sense_hdr; |
bef4a34a | 389 | |
b856e738 BP |
390 | /* ASSERT(request == &cmd_request->request); */ |
391 | /* ASSERT(scmnd); */ | |
392 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
393 | /* (unsigned long)cmd_request); */ | |
394 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a HJ |
395 | |
396 | DPRINT_ENTER(STORVSC_DRV); | |
397 | ||
ff568d3a GKH |
398 | if (cmd_request->bounce_sgl_count) { |
399 | /* using bounce buffer */ | |
454f18a9 | 400 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 401 | |
454f18a9 | 402 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
403 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
404 | cmd_request->bounce_sgl, | |
405 | scsi_sg_count(scmnd)); | |
406 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
407 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
408 | } |
409 | ||
410 | scmnd->result = request->Status; | |
411 | ||
ff568d3a GKH |
412 | if (scmnd->result) { |
413 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
414 | request->SenseBufferSize, &sense_hdr)) | |
bef4a34a | 415 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
416 | } |
417 | ||
b856e738 | 418 | /* ASSERT(request->BytesXfer <= request->DataBuffer.Length); */ |
bef4a34a | 419 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
420 | |
421 | scsi_done_fn = scmnd->scsi_done; | |
422 | ||
423 | scmnd->host_scribble = NULL; | |
424 | scmnd->scsi_done = NULL; | |
425 | ||
454f18a9 | 426 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
427 | scsi_done_fn(scmnd); |
428 | ||
429 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
430 | ||
431 | DPRINT_EXIT(STORVSC_DRV); | |
432 | } | |
433 | ||
434 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
435 | { | |
ff568d3a | 436 | int i; |
bef4a34a | 437 | |
454f18a9 | 438 | /* No need to check */ |
bef4a34a HJ |
439 | if (sg_count < 2) |
440 | return -1; | |
441 | ||
454f18a9 | 442 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
443 | for (i = 0; i < sg_count; i++) { |
444 | if (i == 0) { | |
445 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
446 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
447 | return i; | |
ff568d3a GKH |
448 | } else if (i == sg_count - 1) { |
449 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
450 | if (sgl[i].offset != 0) |
451 | return i; | |
ff568d3a GKH |
452 | } else { |
453 | /* make sure no hole in the middle */ | |
bef4a34a | 454 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 455 | return i; |
bef4a34a HJ |
456 | } |
457 | } | |
458 | return -1; | |
459 | } | |
460 | ||
ff568d3a GKH |
461 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
462 | unsigned int sg_count, | |
463 | unsigned int len) | |
bef4a34a HJ |
464 | { |
465 | int i; | |
ff568d3a GKH |
466 | int num_pages; |
467 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
468 | struct page *page_buf; |
469 | ||
470 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
471 | ||
06da0bc8 | 472 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 473 | if (!bounce_sgl) |
bef4a34a | 474 | return NULL; |
bef4a34a | 475 | |
ff568d3a | 476 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
477 | page_buf = alloc_page(GFP_ATOMIC); |
478 | if (!page_buf) | |
bef4a34a | 479 | goto cleanup; |
bef4a34a | 480 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
481 | } |
482 | ||
483 | return bounce_sgl; | |
484 | ||
485 | cleanup: | |
486 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
487 | return NULL; | |
488 | } | |
489 | ||
ff568d3a GKH |
490 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
491 | unsigned int sg_count) | |
bef4a34a HJ |
492 | { |
493 | int i; | |
494 | struct page *page_buf; | |
495 | ||
ff568d3a GKH |
496 | for (i = 0; i < sg_count; i++) { |
497 | page_buf = sg_page((&sgl[i])); | |
498 | if (page_buf != NULL) | |
bef4a34a | 499 | __free_page(page_buf); |
bef4a34a HJ |
500 | } |
501 | ||
502 | kfree(sgl); | |
503 | } | |
504 | ||
454f18a9 | 505 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
506 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
507 | struct scatterlist *bounce_sgl, | |
508 | unsigned int orig_sgl_count) | |
bef4a34a | 509 | { |
ff568d3a GKH |
510 | int i; |
511 | int j = 0; | |
bef4a34a HJ |
512 | unsigned long src, dest; |
513 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
514 | unsigned int total_copied = 0; |
515 | unsigned long bounce_addr = 0; | |
516 | unsigned long src_addr = 0; | |
bef4a34a HJ |
517 | unsigned long flags; |
518 | ||
519 | local_irq_save(flags); | |
520 | ||
ff568d3a GKH |
521 | for (i = 0; i < orig_sgl_count; i++) { |
522 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
523 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
524 | src = src_addr; |
525 | srclen = orig_sgl[i].length; | |
526 | ||
b856e738 | 527 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a HJ |
528 | |
529 | if (j == 0) | |
bef4a34a | 530 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 531 | |
ff568d3a | 532 | while (srclen) { |
454f18a9 | 533 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
534 | dest = bounce_addr + bounce_sgl[j].length; |
535 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
536 | ||
fc6a4b26 | 537 | copylen = min(srclen, destlen); |
ff568d3a | 538 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
539 | |
540 | total_copied += copylen; | |
541 | bounce_sgl[j].length += copylen; | |
542 | srclen -= copylen; | |
543 | src += copylen; | |
544 | ||
ff568d3a GKH |
545 | if (bounce_sgl[j].length == PAGE_SIZE) { |
546 | /* full..move to next entry */ | |
547 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
548 | j++; |
549 | ||
454f18a9 | 550 | /* if we need to use another bounce buffer */ |
ff568d3a | 551 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 552 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
553 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
554 | /* unmap the last bounce that is < PAGE_SIZE */ | |
555 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
556 | } |
557 | } | |
558 | ||
ff568d3a | 559 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
560 | } |
561 | ||
562 | local_irq_restore(flags); | |
563 | ||
564 | return total_copied; | |
565 | } | |
566 | ||
454f18a9 | 567 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
568 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
569 | struct scatterlist *bounce_sgl, | |
570 | unsigned int orig_sgl_count) | |
bef4a34a | 571 | { |
ff568d3a GKH |
572 | int i; |
573 | int j = 0; | |
bef4a34a HJ |
574 | unsigned long src, dest; |
575 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
576 | unsigned int total_copied = 0; |
577 | unsigned long bounce_addr = 0; | |
578 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
579 | unsigned long flags; |
580 | ||
581 | local_irq_save(flags); | |
582 | ||
ff568d3a GKH |
583 | for (i = 0; i < orig_sgl_count; i++) { |
584 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
585 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
586 | dest = dest_addr; |
587 | destlen = orig_sgl[i].length; | |
b856e738 | 588 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a HJ |
589 | |
590 | if (j == 0) | |
bef4a34a | 591 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 592 | |
ff568d3a | 593 | while (destlen) { |
bef4a34a HJ |
594 | src = bounce_addr + bounce_sgl[j].offset; |
595 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
596 | ||
fc6a4b26 | 597 | copylen = min(srclen, destlen); |
ff568d3a | 598 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
599 | |
600 | total_copied += copylen; | |
601 | bounce_sgl[j].offset += copylen; | |
602 | destlen -= copylen; | |
603 | dest += copylen; | |
604 | ||
ff568d3a GKH |
605 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
606 | /* full */ | |
607 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
608 | j++; |
609 | ||
454f18a9 | 610 | /* if we need to use another bounce buffer */ |
ff568d3a | 611 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 612 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
613 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
614 | /* unmap the last bounce that is < PAGE_SIZE */ | |
615 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
616 | } |
617 | } | |
618 | ||
ff568d3a GKH |
619 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
620 | KM_IRQ0); | |
bef4a34a HJ |
621 | } |
622 | ||
623 | local_irq_restore(flags); | |
624 | ||
625 | return total_copied; | |
626 | } | |
627 | ||
3e189519 | 628 | /* |
ff568d3a GKH |
629 | * storvsc_queuecommand - Initiate command processing |
630 | */ | |
631 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, | |
632 | void (*done)(struct scsi_cmnd *)) | |
bef4a34a | 633 | { |
ff568d3a GKH |
634 | int ret; |
635 | struct host_device_context *host_device_ctx = | |
636 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 637 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
ff568d3a GKH |
638 | struct driver_context *driver_ctx = |
639 | driver_to_driver_context(device_ctx->device.driver); | |
640 | struct storvsc_driver_context *storvsc_drv_ctx = | |
641 | (struct storvsc_driver_context *)driver_ctx; | |
642 | struct storvsc_driver_object *storvsc_drv_obj = | |
643 | &storvsc_drv_ctx->drv_obj; | |
0b3f6834 | 644 | struct hv_storvsc_request *request; |
bef4a34a | 645 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 646 | unsigned int request_size = 0; |
bef4a34a HJ |
647 | int i; |
648 | struct scatterlist *sgl; | |
649 | ||
650 | DPRINT_ENTER(STORVSC_DRV); | |
651 | ||
ff568d3a GKH |
652 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
653 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
654 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
655 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
656 | scmnd->device->tagged_supported); | |
bef4a34a | 657 | |
454f18a9 | 658 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 659 | if (scmnd->host_scribble) { |
b856e738 | 660 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 661 | |
ff568d3a GKH |
662 | cmd_request = |
663 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
664 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
665 | scmnd, cmd_request); | |
bef4a34a HJ |
666 | |
667 | goto retry_request; | |
668 | } | |
669 | ||
b856e738 BP |
670 | /* ASSERT(scmnd->scsi_done == NULL); */ |
671 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
672 | |
673 | scmnd->scsi_done = done; | |
674 | ||
675 | request_size = sizeof(struct storvsc_cmd_request); | |
676 | ||
ff568d3a GKH |
677 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, |
678 | GFP_ATOMIC); | |
679 | if (!cmd_request) { | |
680 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
681 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
682 | scmnd->scsi_done = NULL; |
683 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
684 | } | |
685 | ||
454f18a9 | 686 | /* Setup the cmd request */ |
bef4a34a HJ |
687 | cmd_request->bounce_sgl_count = 0; |
688 | cmd_request->bounce_sgl = NULL; | |
689 | cmd_request->cmd = scmnd; | |
690 | ||
ff568d3a | 691 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
692 | |
693 | request = &cmd_request->request; | |
694 | ||
ff568d3a GKH |
695 | request->Extension = |
696 | (void *)((unsigned long)cmd_request + request_size); | |
697 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, | |
698 | storvsc_drv_obj->RequestExtSize); | |
bef4a34a | 699 | |
454f18a9 | 700 | /* Build the SRB */ |
ff568d3a | 701 | switch (scmnd->sc_data_direction) { |
bef4a34a HJ |
702 | case DMA_TO_DEVICE: |
703 | request->Type = WRITE_TYPE; | |
704 | break; | |
705 | case DMA_FROM_DEVICE: | |
706 | request->Type = READ_TYPE; | |
707 | break; | |
708 | default: | |
709 | request->Type = UNKNOWN_TYPE; | |
710 | break; | |
711 | } | |
712 | ||
713 | request->OnIOCompletion = storvsc_commmand_completion; | |
454f18a9 | 714 | request->Context = cmd_request;/* scmnd; */ |
bef4a34a | 715 | |
454f18a9 | 716 | /* request->PortId = scmnd->device->channel; */ |
bef4a34a HJ |
717 | request->Host = host_device_ctx->port; |
718 | request->Bus = scmnd->device->channel; | |
719 | request->TargetId = scmnd->device->id; | |
720 | request->LunId = scmnd->device->lun; | |
721 | ||
b856e738 | 722 | /* ASSERT(scmnd->cmd_len <= 16); */ |
bef4a34a HJ |
723 | request->CdbLen = scmnd->cmd_len; |
724 | request->Cdb = scmnd->cmnd; | |
725 | ||
726 | request->SenseBuffer = scmnd->sense_buffer; | |
727 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
728 | ||
729 | ||
bef4a34a | 730 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
ff568d3a GKH |
731 | if (scsi_sg_count(scmnd)) { |
732 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
bef4a34a | 733 | |
454f18a9 | 734 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
735 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
736 | DPRINT_INFO(STORVSC_DRV, | |
737 | "need to bounce buffer for this scmnd %p", | |
738 | scmnd); | |
739 | cmd_request->bounce_sgl = | |
740 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
741 | scsi_bufflen(scmnd)); | |
742 | if (!cmd_request->bounce_sgl) { | |
743 | DPRINT_ERR(STORVSC_DRV, | |
744 | "unable to create bounce buffer for " | |
745 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
746 | |
747 | scmnd->scsi_done = NULL; | |
748 | scmnd->host_scribble = NULL; | |
ff568d3a GKH |
749 | kmem_cache_free(host_device_ctx->request_pool, |
750 | cmd_request); | |
bef4a34a HJ |
751 | |
752 | return SCSI_MLQUEUE_HOST_BUSY; | |
753 | } | |
754 | ||
ff568d3a GKH |
755 | cmd_request->bounce_sgl_count = |
756 | ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
757 | PAGE_SHIFT; | |
bef4a34a | 758 | |
ff568d3a GKH |
759 | /* |
760 | * FIXME: We can optimize on reads by just skipping | |
761 | * this | |
762 | */ | |
763 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
764 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
765 | |
766 | sgl = cmd_request->bounce_sgl; | |
767 | } | |
768 | ||
769 | request->DataBuffer.Offset = sgl[0].offset; | |
770 | ||
ff568d3a | 771 | for (i = 0; i < scsi_sg_count(scmnd); i++) { |
0686e4f4 | 772 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n", |
ff568d3a GKH |
773 | i, sgl[i].length, sgl[i].offset); |
774 | request->DataBuffer.PfnArray[i] = | |
775 | page_to_pfn(sg_page((&sgl[i]))); | |
bef4a34a | 776 | } |
ff568d3a | 777 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 778 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
ff568d3a GKH |
779 | request->DataBuffer.Offset = |
780 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
781 | request->DataBuffer.PfnArray[0] = | |
782 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
bef4a34a | 783 | } |
bef4a34a HJ |
784 | |
785 | retry_request: | |
454f18a9 | 786 | /* Invokes the vsc to start an IO */ |
ff568d3a GKH |
787 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, |
788 | &cmd_request->request); | |
789 | if (ret == -1) { | |
790 | /* no more space */ | |
791 | DPRINT_ERR(STORVSC_DRV, | |
792 | "scmnd (%p) - queue FULL...marking queue busy", | |
793 | scmnd); | |
794 | ||
795 | if (cmd_request->bounce_sgl_count) { | |
796 | /* | |
797 | * FIXME: We can optimize on writes by just skipping | |
798 | * this | |
799 | */ | |
800 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
801 | cmd_request->bounce_sgl, | |
802 | scsi_sg_count(scmnd)); | |
803 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
804 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
805 | } |
806 | ||
807 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
808 | ||
809 | scmnd->scsi_done = NULL; | |
810 | scmnd->host_scribble = NULL; | |
811 | ||
812 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
813 | } | |
814 | ||
815 | DPRINT_EXIT(STORVSC_DRV); | |
816 | ||
817 | return ret; | |
818 | } | |
819 | ||
ff568d3a GKH |
820 | static int storvsc_merge_bvec(struct request_queue *q, |
821 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 822 | { |
ff568d3a GKH |
823 | /* checking done by caller. */ |
824 | return bvec->bv_len; | |
bef4a34a | 825 | } |
bef4a34a | 826 | |
3e189519 | 827 | /* |
ff568d3a GKH |
828 | * storvsc_device_configure - Configure the specified scsi device |
829 | */ | |
bef4a34a HJ |
830 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
831 | { | |
ff568d3a GKH |
832 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
833 | sdevice, BLIST_SPARSELUN); | |
834 | /* | |
835 | * This enables luns to be located sparsely. Otherwise, we may not | |
836 | * discovered them. | |
837 | */ | |
bef4a34a | 838 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
839 | return 0; |
840 | } | |
841 | ||
842 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
843 | { | |
ff568d3a GKH |
844 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
845 | sdevice->queue_depth); | |
bef4a34a | 846 | |
ff568d3a GKH |
847 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
848 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
849 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
850 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 851 | |
ff568d3a GKH |
852 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
853 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
854 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
855 | ||
ff568d3a GKH |
856 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
857 | sdevice); | |
bef4a34a HJ |
858 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
859 | ||
860 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 861 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
862 | |
863 | return 0; | |
864 | } | |
865 | ||
3e189519 | 866 | /* |
ff568d3a GKH |
867 | * storvsc_host_reset_handler - Reset the scsi HBA |
868 | */ | |
bef4a34a HJ |
869 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
870 | { | |
ff568d3a GKH |
871 | int ret; |
872 | struct host_device_context *host_device_ctx = | |
873 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 874 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
bef4a34a HJ |
875 | |
876 | DPRINT_ENTER(STORVSC_DRV); | |
877 | ||
ff568d3a GKH |
878 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
879 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a | 880 | |
454f18a9 | 881 | /* Invokes the vsc to reset the host/bus */ |
354b0a64 | 882 | ret = StorVscOnHostReset(&device_ctx->device_obj); |
ff568d3a | 883 | if (ret != 0) { |
bef4a34a HJ |
884 | DPRINT_EXIT(STORVSC_DRV); |
885 | return ret; | |
886 | } | |
887 | ||
ff568d3a GKH |
888 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
889 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a HJ |
890 | |
891 | DPRINT_EXIT(STORVSC_DRV); | |
892 | ||
893 | return ret; | |
894 | } | |
895 | ||
ff568d3a GKH |
896 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
897 | sector_t capacity, int *info) | |
bef4a34a HJ |
898 | { |
899 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
900 | sector_t cylinder_times_heads = 0; |
901 | sector_t temp = 0; | |
bef4a34a | 902 | |
ff568d3a GKH |
903 | int sectors_per_track = 0; |
904 | int heads = 0; | |
905 | int cylinders = 0; | |
906 | int rem = 0; | |
bef4a34a | 907 | |
ff568d3a GKH |
908 | if (total_sectors > (65535 * 16 * 255)) |
909 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 910 | |
ff568d3a GKH |
911 | if (total_sectors >= (65535 * 16 * 63)) { |
912 | sectors_per_track = 255; | |
913 | heads = 16; | |
bef4a34a HJ |
914 | |
915 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
916 | /* sector_div stores the quotient in cylinder_times_heads */ |
917 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
918 | } else { | |
919 | sectors_per_track = 17; | |
bef4a34a HJ |
920 | |
921 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
922 | /* sector_div stores the quotient in cylinder_times_heads */ |
923 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
924 | |
925 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
926 | /* sector_div stores the quotient in temp */ |
927 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
928 | |
929 | heads = temp; | |
930 | ||
ff568d3a GKH |
931 | if (heads < 4) |
932 | heads = 4; | |
bef4a34a | 933 | |
ff568d3a GKH |
934 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
935 | sectors_per_track = 31; | |
936 | heads = 16; | |
bef4a34a HJ |
937 | |
938 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
939 | /* |
940 | * sector_div stores the quotient in | |
941 | * cylinder_times_heads | |
942 | */ | |
943 | rem = sector_div(cylinder_times_heads, | |
944 | sectors_per_track); | |
945 | } | |
bef4a34a | 946 | |
ff568d3a GKH |
947 | if (cylinder_times_heads >= (heads * 1024)) { |
948 | sectors_per_track = 63; | |
949 | heads = 16; | |
bef4a34a HJ |
950 | |
951 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
952 | /* |
953 | * sector_div stores the quotient in | |
954 | * cylinder_times_heads | |
955 | */ | |
956 | rem = sector_div(cylinder_times_heads, | |
957 | sectors_per_track); | |
958 | } | |
959 | } | |
bef4a34a HJ |
960 | |
961 | temp = cylinder_times_heads; | |
ff568d3a GKH |
962 | /* sector_div stores the quotient in temp */ |
963 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
964 | cylinders = temp; |
965 | ||
966 | info[0] = heads; | |
ff568d3a GKH |
967 | info[1] = sectors_per_track; |
968 | info[2] = cylinders; | |
bef4a34a | 969 | |
ff568d3a GKH |
970 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
971 | sectors_per_track); | |
bef4a34a HJ |
972 | |
973 | return 0; | |
974 | } | |
975 | ||
bef4a34a HJ |
976 | static int __init storvsc_init(void) |
977 | { | |
978 | int ret; | |
979 | ||
980 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 981 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
bef4a34a | 982 | ret = storvsc_drv_init(StorVscInitialize); |
bef4a34a | 983 | DPRINT_EXIT(STORVSC_DRV); |
bef4a34a HJ |
984 | return ret; |
985 | } | |
986 | ||
987 | static void __exit storvsc_exit(void) | |
988 | { | |
989 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 990 | storvsc_drv_exit(); |
bef4a34a HJ |
991 | DPRINT_ENTER(STORVSC_DRV); |
992 | } | |
993 | ||
ff568d3a | 994 | MODULE_LICENSE("GPL"); |
26c14cc1 | 995 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 996 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
997 | module_init(storvsc_init); |
998 | module_exit(storvsc_exit); |