]>
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> | |
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 | 143 | |
bef4a34a | 144 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; |
bef4a34a | 145 | |
454f18a9 | 146 | /* Callback to client driver to complete the initialization */ |
21707bed | 147 | drv_init(&storvsc_drv_obj->Base); |
bef4a34a | 148 | |
ff568d3a GKH |
149 | DPRINT_INFO(STORVSC_DRV, |
150 | "request extension size %u, max outstanding reqs %u", | |
151 | storvsc_drv_obj->RequestExtSize, | |
152 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
153 | ||
154 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < | |
155 | STORVSC_MAX_IO_REQUESTS) { | |
156 | DPRINT_ERR(STORVSC_DRV, | |
157 | "The number of outstanding io requests (%d) " | |
158 | "is larger than that supported (%d) internally.", | |
159 | STORVSC_MAX_IO_REQUESTS, | |
160 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
bef4a34a HJ |
161 | return -1; |
162 | } | |
163 | ||
164 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
ff568d3a GKH |
165 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
166 | sizeof(struct hv_guid)); | |
bef4a34a | 167 | |
bef4a34a HJ |
168 | drv_ctx->probe = storvsc_probe; |
169 | drv_ctx->remove = storvsc_remove; | |
bef4a34a | 170 | |
454f18a9 | 171 | /* The driver belongs to vmbus */ |
5d48a1c2 | 172 | ret = vmbus_child_driver_register(drv_ctx); |
bef4a34a | 173 | |
bef4a34a HJ |
174 | return ret; |
175 | } | |
176 | ||
bef4a34a HJ |
177 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
178 | { | |
179 | struct device **curr = (struct device **)data; | |
180 | *curr = dev; | |
454f18a9 | 181 | return 1; /* stop iterating */ |
bef4a34a HJ |
182 | } |
183 | ||
bd1de709 | 184 | static void storvsc_drv_exit(void) |
bef4a34a | 185 | { |
9f0c7d2c | 186 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a GKH |
187 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
188 | struct device *current_dev = NULL; | |
2295ba2e | 189 | int ret; |
bef4a34a | 190 | |
ff568d3a | 191 | while (1) { |
bef4a34a HJ |
192 | current_dev = NULL; |
193 | ||
454f18a9 | 194 | /* Get the device */ |
2295ba2e BP |
195 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
196 | (void *) ¤t_dev, | |
197 | storvsc_drv_exit_cb); | |
198 | ||
199 | if (ret) | |
200 | DPRINT_WARN(STORVSC_DRV, | |
201 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
202 | |
203 | if (current_dev == NULL) | |
204 | break; | |
205 | ||
454f18a9 | 206 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
207 | device_unregister(current_dev); |
208 | } | |
209 | ||
210 | if (storvsc_drv_obj->Base.OnCleanup) | |
211 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
212 | ||
213 | vmbus_child_driver_unregister(drv_ctx); | |
bef4a34a HJ |
214 | return; |
215 | } | |
216 | ||
3e189519 | 217 | /* |
ff568d3a GKH |
218 | * storvsc_probe - Add a new device for this driver |
219 | */ | |
bef4a34a HJ |
220 | static int storvsc_probe(struct device *device) |
221 | { | |
ff568d3a GKH |
222 | int ret; |
223 | struct driver_context *driver_ctx = | |
224 | driver_to_driver_context(device->driver); | |
225 | struct storvsc_driver_context *storvsc_drv_ctx = | |
226 | (struct storvsc_driver_context *)driver_ctx; | |
227 | struct storvsc_driver_object *storvsc_drv_obj = | |
228 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 229 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 230 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a HJ |
231 | struct Scsi_Host *host; |
232 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 233 | struct storvsc_device_info device_info; |
bef4a34a | 234 | |
bef4a34a HJ |
235 | if (!storvsc_drv_obj->Base.OnDeviceAdd) |
236 | return -1; | |
237 | ||
ff568d3a GKH |
238 | host = scsi_host_alloc(&scsi_driver, |
239 | sizeof(struct host_device_context)); | |
240 | if (!host) { | |
bef4a34a HJ |
241 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
0883c52b | 245 | dev_set_drvdata(device, host); |
bef4a34a | 246 | |
ff568d3a | 247 | host_device_ctx = (struct host_device_context *)host->hostdata; |
bef4a34a HJ |
248 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
249 | ||
250 | host_device_ctx->port = host->host_no; | |
251 | host_device_ctx->device_ctx = device_ctx; | |
252 | ||
bef4a34a | 253 | host_device_ctx->request_pool = |
ff568d3a GKH |
254 | kmem_cache_create(dev_name(&device_ctx->device), |
255 | sizeof(struct storvsc_cmd_request) + | |
256 | storvsc_drv_obj->RequestExtSize, 0, | |
257 | SLAB_HWCACHE_ALIGN, NULL); | |
258 | ||
259 | if (!host_device_ctx->request_pool) { | |
bef4a34a | 260 | scsi_host_put(host); |
bef4a34a HJ |
261 | return -ENOMEM; |
262 | } | |
263 | ||
264 | device_info.PortNumber = host->host_no; | |
454f18a9 | 265 | /* Call to the vsc driver to add the device */ |
ff568d3a GKH |
266 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, |
267 | (void *)&device_info); | |
268 | if (ret != 0) { | |
bef4a34a HJ |
269 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
270 | kmem_cache_destroy(host_device_ctx->request_pool); | |
271 | scsi_host_put(host); | |
bef4a34a HJ |
272 | return -1; |
273 | } | |
274 | ||
454f18a9 | 275 | /* host_device_ctx->port = device_info.PortNumber; */ |
bef4a34a HJ |
276 | host_device_ctx->path = device_info.PathId; |
277 | host_device_ctx->target = device_info.TargetId; | |
278 | ||
ff568d3a GKH |
279 | /* max # of devices per target */ |
280 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
281 | /* max # of targets per channel */ | |
282 | host->max_id = STORVSC_MAX_TARGETS; | |
283 | /* max # of channels */ | |
284 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 285 | |
454f18a9 | 286 | /* Register the HBA and start the scsi bus scan */ |
bef4a34a | 287 | ret = scsi_add_host(host, device); |
ff568d3a | 288 | if (ret != 0) { |
bef4a34a HJ |
289 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
290 | ||
291 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
292 | ||
293 | kmem_cache_destroy(host_device_ctx->request_pool); | |
294 | scsi_host_put(host); | |
bef4a34a HJ |
295 | return -1; |
296 | } | |
297 | ||
298 | scsi_scan_host(host); | |
bef4a34a HJ |
299 | return ret; |
300 | } | |
301 | ||
3e189519 | 302 | /* |
ff568d3a GKH |
303 | * storvsc_remove - Callback when our device is removed |
304 | */ | |
bef4a34a HJ |
305 | static int storvsc_remove(struct device *device) |
306 | { | |
ff568d3a GKH |
307 | int ret; |
308 | struct driver_context *driver_ctx = | |
309 | driver_to_driver_context(device->driver); | |
310 | struct storvsc_driver_context *storvsc_drv_ctx = | |
311 | (struct storvsc_driver_context *)driver_ctx; | |
312 | struct storvsc_driver_object *storvsc_drv_obj = | |
313 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 314 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 315 | struct hv_device *device_obj = &device_ctx->device_obj; |
0883c52b | 316 | struct Scsi_Host *host = dev_get_drvdata(device); |
ff568d3a GKH |
317 | struct host_device_context *host_device_ctx = |
318 | (struct host_device_context *)host->hostdata; | |
bef4a34a HJ |
319 | |
320 | ||
83c720ea | 321 | if (!storvsc_drv_obj->Base.OnDeviceRemove) |
bef4a34a | 322 | return -1; |
bef4a34a | 323 | |
ff568d3a GKH |
324 | /* |
325 | * Call to the vsc driver to let it know that the device is being | |
326 | * removed | |
327 | */ | |
bef4a34a | 328 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
ff568d3a | 329 | if (ret != 0) { |
454f18a9 | 330 | /* TODO: */ |
ff568d3a GKH |
331 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", |
332 | ret); | |
bef4a34a HJ |
333 | } |
334 | ||
ff568d3a | 335 | if (host_device_ctx->request_pool) { |
bef4a34a HJ |
336 | kmem_cache_destroy(host_device_ctx->request_pool); |
337 | host_device_ctx->request_pool = NULL; | |
338 | } | |
339 | ||
340 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
341 | scsi_remove_host(host); | |
342 | ||
343 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
344 | scsi_host_put(host); | |
bef4a34a HJ |
345 | return ret; |
346 | } | |
347 | ||
3e189519 | 348 | /* |
ff568d3a GKH |
349 | * storvsc_commmand_completion - Command completion processing |
350 | */ | |
0b3f6834 | 351 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 352 | { |
ff568d3a GKH |
353 | struct storvsc_cmd_request *cmd_request = |
354 | (struct storvsc_cmd_request *)request->Context; | |
bef4a34a | 355 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
ff568d3a GKH |
356 | struct host_device_context *host_device_ctx = |
357 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 358 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 359 | struct scsi_sense_hdr sense_hdr; |
bef4a34a | 360 | |
b856e738 BP |
361 | /* ASSERT(request == &cmd_request->request); */ |
362 | /* ASSERT(scmnd); */ | |
363 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
364 | /* (unsigned long)cmd_request); */ | |
365 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 366 | |
ff568d3a GKH |
367 | if (cmd_request->bounce_sgl_count) { |
368 | /* using bounce buffer */ | |
454f18a9 | 369 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 370 | |
454f18a9 | 371 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
372 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
373 | cmd_request->bounce_sgl, | |
374 | scsi_sg_count(scmnd)); | |
375 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
376 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
377 | } |
378 | ||
379 | scmnd->result = request->Status; | |
380 | ||
ff568d3a GKH |
381 | if (scmnd->result) { |
382 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
383 | request->SenseBufferSize, &sense_hdr)) | |
bef4a34a | 384 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
385 | } |
386 | ||
b856e738 | 387 | /* ASSERT(request->BytesXfer <= request->DataBuffer.Length); */ |
bef4a34a | 388 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
389 | |
390 | scsi_done_fn = scmnd->scsi_done; | |
391 | ||
392 | scmnd->host_scribble = NULL; | |
393 | scmnd->scsi_done = NULL; | |
394 | ||
454f18a9 | 395 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
396 | scsi_done_fn(scmnd); |
397 | ||
398 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
bef4a34a HJ |
399 | } |
400 | ||
401 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
402 | { | |
ff568d3a | 403 | int i; |
bef4a34a | 404 | |
454f18a9 | 405 | /* No need to check */ |
bef4a34a HJ |
406 | if (sg_count < 2) |
407 | return -1; | |
408 | ||
454f18a9 | 409 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
410 | for (i = 0; i < sg_count; i++) { |
411 | if (i == 0) { | |
412 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
413 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
414 | return i; | |
ff568d3a GKH |
415 | } else if (i == sg_count - 1) { |
416 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
417 | if (sgl[i].offset != 0) |
418 | return i; | |
ff568d3a GKH |
419 | } else { |
420 | /* make sure no hole in the middle */ | |
bef4a34a | 421 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 422 | return i; |
bef4a34a HJ |
423 | } |
424 | } | |
425 | return -1; | |
426 | } | |
427 | ||
ff568d3a GKH |
428 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
429 | unsigned int sg_count, | |
430 | unsigned int len) | |
bef4a34a HJ |
431 | { |
432 | int i; | |
ff568d3a GKH |
433 | int num_pages; |
434 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
435 | struct page *page_buf; |
436 | ||
437 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
438 | ||
06da0bc8 | 439 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 440 | if (!bounce_sgl) |
bef4a34a | 441 | return NULL; |
bef4a34a | 442 | |
ff568d3a | 443 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
444 | page_buf = alloc_page(GFP_ATOMIC); |
445 | if (!page_buf) | |
bef4a34a | 446 | goto cleanup; |
bef4a34a | 447 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
448 | } |
449 | ||
450 | return bounce_sgl; | |
451 | ||
452 | cleanup: | |
453 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
454 | return NULL; | |
455 | } | |
456 | ||
ff568d3a GKH |
457 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
458 | unsigned int sg_count) | |
bef4a34a HJ |
459 | { |
460 | int i; | |
461 | struct page *page_buf; | |
462 | ||
ff568d3a GKH |
463 | for (i = 0; i < sg_count; i++) { |
464 | page_buf = sg_page((&sgl[i])); | |
465 | if (page_buf != NULL) | |
bef4a34a | 466 | __free_page(page_buf); |
bef4a34a HJ |
467 | } |
468 | ||
469 | kfree(sgl); | |
470 | } | |
471 | ||
454f18a9 | 472 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
473 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
474 | struct scatterlist *bounce_sgl, | |
475 | unsigned int orig_sgl_count) | |
bef4a34a | 476 | { |
ff568d3a GKH |
477 | int i; |
478 | int j = 0; | |
bef4a34a HJ |
479 | unsigned long src, dest; |
480 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
481 | unsigned int total_copied = 0; |
482 | unsigned long bounce_addr = 0; | |
483 | unsigned long src_addr = 0; | |
bef4a34a HJ |
484 | unsigned long flags; |
485 | ||
486 | local_irq_save(flags); | |
487 | ||
ff568d3a GKH |
488 | for (i = 0; i < orig_sgl_count; i++) { |
489 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
490 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
491 | src = src_addr; |
492 | srclen = orig_sgl[i].length; | |
493 | ||
b856e738 | 494 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 495 | |
0c47a70a | 496 | if (bounce_addr == 0) |
bef4a34a | 497 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 498 | |
ff568d3a | 499 | while (srclen) { |
454f18a9 | 500 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
501 | dest = bounce_addr + bounce_sgl[j].length; |
502 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
503 | ||
fc6a4b26 | 504 | copylen = min(srclen, destlen); |
ff568d3a | 505 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
506 | |
507 | total_copied += copylen; | |
508 | bounce_sgl[j].length += copylen; | |
509 | srclen -= copylen; | |
510 | src += copylen; | |
511 | ||
ff568d3a GKH |
512 | if (bounce_sgl[j].length == PAGE_SIZE) { |
513 | /* full..move to next entry */ | |
514 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
515 | j++; |
516 | ||
454f18a9 | 517 | /* if we need to use another bounce buffer */ |
ff568d3a | 518 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 519 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
520 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
521 | /* unmap the last bounce that is < PAGE_SIZE */ | |
522 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
523 | } |
524 | } | |
525 | ||
ff568d3a | 526 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
527 | } |
528 | ||
529 | local_irq_restore(flags); | |
530 | ||
531 | return total_copied; | |
532 | } | |
533 | ||
454f18a9 | 534 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
535 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
536 | struct scatterlist *bounce_sgl, | |
537 | unsigned int orig_sgl_count) | |
bef4a34a | 538 | { |
ff568d3a GKH |
539 | int i; |
540 | int j = 0; | |
bef4a34a HJ |
541 | unsigned long src, dest; |
542 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
543 | unsigned int total_copied = 0; |
544 | unsigned long bounce_addr = 0; | |
545 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
546 | unsigned long flags; |
547 | ||
548 | local_irq_save(flags); | |
549 | ||
ff568d3a GKH |
550 | for (i = 0; i < orig_sgl_count; i++) { |
551 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
552 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
553 | dest = dest_addr; |
554 | destlen = orig_sgl[i].length; | |
b856e738 | 555 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 556 | |
0c47a70a | 557 | if (bounce_addr == 0) |
bef4a34a | 558 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 559 | |
ff568d3a | 560 | while (destlen) { |
bef4a34a HJ |
561 | src = bounce_addr + bounce_sgl[j].offset; |
562 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
563 | ||
fc6a4b26 | 564 | copylen = min(srclen, destlen); |
ff568d3a | 565 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
566 | |
567 | total_copied += copylen; | |
568 | bounce_sgl[j].offset += copylen; | |
569 | destlen -= copylen; | |
570 | dest += copylen; | |
571 | ||
ff568d3a GKH |
572 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
573 | /* full */ | |
574 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
575 | j++; |
576 | ||
454f18a9 | 577 | /* if we need to use another bounce buffer */ |
ff568d3a | 578 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 579 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
580 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
581 | /* unmap the last bounce that is < PAGE_SIZE */ | |
582 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
583 | } |
584 | } | |
585 | ||
ff568d3a GKH |
586 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
587 | KM_IRQ0); | |
bef4a34a HJ |
588 | } |
589 | ||
590 | local_irq_restore(flags); | |
591 | ||
592 | return total_copied; | |
593 | } | |
594 | ||
3e189519 | 595 | /* |
ff568d3a GKH |
596 | * storvsc_queuecommand - Initiate command processing |
597 | */ | |
598 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, | |
599 | void (*done)(struct scsi_cmnd *)) | |
bef4a34a | 600 | { |
ff568d3a GKH |
601 | int ret; |
602 | struct host_device_context *host_device_ctx = | |
603 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 604 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
ff568d3a GKH |
605 | struct driver_context *driver_ctx = |
606 | driver_to_driver_context(device_ctx->device.driver); | |
607 | struct storvsc_driver_context *storvsc_drv_ctx = | |
608 | (struct storvsc_driver_context *)driver_ctx; | |
609 | struct storvsc_driver_object *storvsc_drv_obj = | |
610 | &storvsc_drv_ctx->drv_obj; | |
0b3f6834 | 611 | struct hv_storvsc_request *request; |
bef4a34a | 612 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 613 | unsigned int request_size = 0; |
bef4a34a HJ |
614 | int i; |
615 | struct scatterlist *sgl; | |
77c5ceaf | 616 | unsigned int sg_count = 0; |
bef4a34a | 617 | |
ff568d3a GKH |
618 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
619 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
620 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
621 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
622 | scmnd->device->tagged_supported); | |
bef4a34a | 623 | |
454f18a9 | 624 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 625 | if (scmnd->host_scribble) { |
b856e738 | 626 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 627 | |
ff568d3a GKH |
628 | cmd_request = |
629 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
630 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
631 | scmnd, cmd_request); | |
bef4a34a HJ |
632 | |
633 | goto retry_request; | |
634 | } | |
635 | ||
b856e738 BP |
636 | /* ASSERT(scmnd->scsi_done == NULL); */ |
637 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
638 | |
639 | scmnd->scsi_done = done; | |
640 | ||
641 | request_size = sizeof(struct storvsc_cmd_request); | |
642 | ||
ff568d3a GKH |
643 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, |
644 | GFP_ATOMIC); | |
645 | if (!cmd_request) { | |
646 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
647 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
648 | scmnd->scsi_done = NULL; |
649 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
650 | } | |
651 | ||
454f18a9 | 652 | /* Setup the cmd request */ |
bef4a34a HJ |
653 | cmd_request->bounce_sgl_count = 0; |
654 | cmd_request->bounce_sgl = NULL; | |
655 | cmd_request->cmd = scmnd; | |
656 | ||
ff568d3a | 657 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
658 | |
659 | request = &cmd_request->request; | |
660 | ||
ff568d3a GKH |
661 | request->Extension = |
662 | (void *)((unsigned long)cmd_request + request_size); | |
663 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, | |
664 | storvsc_drv_obj->RequestExtSize); | |
bef4a34a | 665 | |
454f18a9 | 666 | /* Build the SRB */ |
ff568d3a | 667 | switch (scmnd->sc_data_direction) { |
bef4a34a HJ |
668 | case DMA_TO_DEVICE: |
669 | request->Type = WRITE_TYPE; | |
670 | break; | |
671 | case DMA_FROM_DEVICE: | |
672 | request->Type = READ_TYPE; | |
673 | break; | |
674 | default: | |
675 | request->Type = UNKNOWN_TYPE; | |
676 | break; | |
677 | } | |
678 | ||
679 | request->OnIOCompletion = storvsc_commmand_completion; | |
454f18a9 | 680 | request->Context = cmd_request;/* scmnd; */ |
bef4a34a | 681 | |
454f18a9 | 682 | /* request->PortId = scmnd->device->channel; */ |
bef4a34a HJ |
683 | request->Host = host_device_ctx->port; |
684 | request->Bus = scmnd->device->channel; | |
685 | request->TargetId = scmnd->device->id; | |
686 | request->LunId = scmnd->device->lun; | |
687 | ||
b856e738 | 688 | /* ASSERT(scmnd->cmd_len <= 16); */ |
bef4a34a HJ |
689 | request->CdbLen = scmnd->cmd_len; |
690 | request->Cdb = scmnd->cmnd; | |
691 | ||
692 | request->SenseBuffer = scmnd->sense_buffer; | |
693 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
694 | ||
695 | ||
bef4a34a | 696 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
ff568d3a GKH |
697 | if (scsi_sg_count(scmnd)) { |
698 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 699 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 700 | |
454f18a9 | 701 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
702 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
703 | DPRINT_INFO(STORVSC_DRV, | |
704 | "need to bounce buffer for this scmnd %p", | |
705 | scmnd); | |
706 | cmd_request->bounce_sgl = | |
707 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
708 | scsi_bufflen(scmnd)); | |
709 | if (!cmd_request->bounce_sgl) { | |
710 | DPRINT_ERR(STORVSC_DRV, | |
711 | "unable to create bounce buffer for " | |
712 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
713 | |
714 | scmnd->scsi_done = NULL; | |
715 | scmnd->host_scribble = NULL; | |
ff568d3a GKH |
716 | kmem_cache_free(host_device_ctx->request_pool, |
717 | cmd_request); | |
bef4a34a HJ |
718 | |
719 | return SCSI_MLQUEUE_HOST_BUSY; | |
720 | } | |
721 | ||
ff568d3a GKH |
722 | cmd_request->bounce_sgl_count = |
723 | ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
724 | PAGE_SHIFT; | |
bef4a34a | 725 | |
ff568d3a GKH |
726 | /* |
727 | * FIXME: We can optimize on reads by just skipping | |
728 | * this | |
729 | */ | |
730 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
731 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
732 | |
733 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 734 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
735 | } |
736 | ||
737 | request->DataBuffer.Offset = sgl[0].offset; | |
738 | ||
77c5ceaf | 739 | for (i = 0; i < sg_count; i++) { |
0686e4f4 | 740 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n", |
ff568d3a GKH |
741 | i, sgl[i].length, sgl[i].offset); |
742 | request->DataBuffer.PfnArray[i] = | |
77c5ceaf | 743 | page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a | 744 | } |
ff568d3a | 745 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 746 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
ff568d3a GKH |
747 | request->DataBuffer.Offset = |
748 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
749 | request->DataBuffer.PfnArray[0] = | |
750 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
bef4a34a | 751 | } |
bef4a34a HJ |
752 | |
753 | retry_request: | |
454f18a9 | 754 | /* Invokes the vsc to start an IO */ |
ff568d3a GKH |
755 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, |
756 | &cmd_request->request); | |
757 | if (ret == -1) { | |
758 | /* no more space */ | |
759 | DPRINT_ERR(STORVSC_DRV, | |
760 | "scmnd (%p) - queue FULL...marking queue busy", | |
761 | scmnd); | |
762 | ||
763 | if (cmd_request->bounce_sgl_count) { | |
764 | /* | |
765 | * FIXME: We can optimize on writes by just skipping | |
766 | * this | |
767 | */ | |
768 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
769 | cmd_request->bounce_sgl, | |
770 | scsi_sg_count(scmnd)); | |
771 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
772 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
773 | } |
774 | ||
775 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
776 | ||
777 | scmnd->scsi_done = NULL; | |
778 | scmnd->host_scribble = NULL; | |
779 | ||
780 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
781 | } | |
782 | ||
bef4a34a HJ |
783 | return ret; |
784 | } | |
785 | ||
ff568d3a GKH |
786 | static int storvsc_merge_bvec(struct request_queue *q, |
787 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 788 | { |
ff568d3a GKH |
789 | /* checking done by caller. */ |
790 | return bvec->bv_len; | |
bef4a34a | 791 | } |
bef4a34a | 792 | |
3e189519 | 793 | /* |
ff568d3a GKH |
794 | * storvsc_device_configure - Configure the specified scsi device |
795 | */ | |
bef4a34a HJ |
796 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
797 | { | |
ff568d3a GKH |
798 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
799 | sdevice, BLIST_SPARSELUN); | |
800 | /* | |
801 | * This enables luns to be located sparsely. Otherwise, we may not | |
802 | * discovered them. | |
803 | */ | |
bef4a34a | 804 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
805 | return 0; |
806 | } | |
807 | ||
808 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
809 | { | |
ff568d3a GKH |
810 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
811 | sdevice->queue_depth); | |
bef4a34a | 812 | |
ff568d3a GKH |
813 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
814 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
815 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
816 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 817 | |
ff568d3a GKH |
818 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
819 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
820 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
821 | ||
ff568d3a GKH |
822 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
823 | sdevice); | |
bef4a34a HJ |
824 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
825 | ||
826 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 827 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
828 | |
829 | return 0; | |
830 | } | |
831 | ||
3e189519 | 832 | /* |
ff568d3a GKH |
833 | * storvsc_host_reset_handler - Reset the scsi HBA |
834 | */ | |
bef4a34a HJ |
835 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
836 | { | |
ff568d3a GKH |
837 | int ret; |
838 | struct host_device_context *host_device_ctx = | |
839 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 840 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
bef4a34a | 841 | |
ff568d3a GKH |
842 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
843 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a | 844 | |
454f18a9 | 845 | /* Invokes the vsc to reset the host/bus */ |
354b0a64 | 846 | ret = StorVscOnHostReset(&device_ctx->device_obj); |
83c720ea | 847 | if (ret != 0) |
bef4a34a | 848 | return ret; |
bef4a34a | 849 | |
ff568d3a GKH |
850 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
851 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a | 852 | |
bef4a34a HJ |
853 | return ret; |
854 | } | |
855 | ||
ff568d3a GKH |
856 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
857 | sector_t capacity, int *info) | |
bef4a34a HJ |
858 | { |
859 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
860 | sector_t cylinder_times_heads = 0; |
861 | sector_t temp = 0; | |
bef4a34a | 862 | |
ff568d3a GKH |
863 | int sectors_per_track = 0; |
864 | int heads = 0; | |
865 | int cylinders = 0; | |
866 | int rem = 0; | |
bef4a34a | 867 | |
ff568d3a GKH |
868 | if (total_sectors > (65535 * 16 * 255)) |
869 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 870 | |
ff568d3a GKH |
871 | if (total_sectors >= (65535 * 16 * 63)) { |
872 | sectors_per_track = 255; | |
873 | heads = 16; | |
bef4a34a HJ |
874 | |
875 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
876 | /* sector_div stores the quotient in cylinder_times_heads */ |
877 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
878 | } else { | |
879 | sectors_per_track = 17; | |
bef4a34a HJ |
880 | |
881 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
882 | /* sector_div stores the quotient in cylinder_times_heads */ |
883 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
884 | |
885 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
886 | /* sector_div stores the quotient in temp */ |
887 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
888 | |
889 | heads = temp; | |
890 | ||
ff568d3a GKH |
891 | if (heads < 4) |
892 | heads = 4; | |
bef4a34a | 893 | |
ff568d3a GKH |
894 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
895 | sectors_per_track = 31; | |
896 | heads = 16; | |
bef4a34a HJ |
897 | |
898 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
899 | /* |
900 | * sector_div stores the quotient in | |
901 | * cylinder_times_heads | |
902 | */ | |
903 | rem = sector_div(cylinder_times_heads, | |
904 | sectors_per_track); | |
905 | } | |
bef4a34a | 906 | |
ff568d3a GKH |
907 | if (cylinder_times_heads >= (heads * 1024)) { |
908 | sectors_per_track = 63; | |
909 | heads = 16; | |
bef4a34a HJ |
910 | |
911 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
912 | /* |
913 | * sector_div stores the quotient in | |
914 | * cylinder_times_heads | |
915 | */ | |
916 | rem = sector_div(cylinder_times_heads, | |
917 | sectors_per_track); | |
918 | } | |
919 | } | |
bef4a34a HJ |
920 | |
921 | temp = cylinder_times_heads; | |
ff568d3a GKH |
922 | /* sector_div stores the quotient in temp */ |
923 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
924 | cylinders = temp; |
925 | ||
926 | info[0] = heads; | |
ff568d3a GKH |
927 | info[1] = sectors_per_track; |
928 | info[2] = cylinders; | |
bef4a34a | 929 | |
ff568d3a GKH |
930 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
931 | sectors_per_track); | |
bef4a34a HJ |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
bef4a34a HJ |
936 | static int __init storvsc_init(void) |
937 | { | |
938 | int ret; | |
939 | ||
bef4a34a | 940 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
bef4a34a | 941 | ret = storvsc_drv_init(StorVscInitialize); |
bef4a34a HJ |
942 | return ret; |
943 | } | |
944 | ||
945 | static void __exit storvsc_exit(void) | |
946 | { | |
bef4a34a | 947 | storvsc_drv_exit(); |
bef4a34a HJ |
948 | } |
949 | ||
ff568d3a | 950 | MODULE_LICENSE("GPL"); |
26c14cc1 | 951 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 952 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
953 | module_init(storvsc_init); |
954 | module_exit(storvsc_exit); |