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 HJ |
21 | #include <linux/init.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/blkdev.h> | |
bef4a34a HJ |
25 | #include <scsi/scsi.h> |
26 | #include <scsi/scsi_cmnd.h> | |
27 | #include <scsi/scsi_host.h> | |
28 | #include <scsi/scsi_device.h> | |
29 | #include <scsi/scsi_tcq.h> | |
30 | #include <scsi/scsi_eh.h> | |
31 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 32 | #include <scsi/scsi_dbg.h> |
4983b39a | 33 | #include "osd.h" |
645954c5 | 34 | #include "logging.h" |
870cde80 | 35 | #include "vmbus.h" |
731a7884 | 36 | #include "StorVscApi.h" |
bef4a34a | 37 | |
bef4a34a | 38 | |
bef4a34a | 39 | struct host_device_context { |
ff568d3a GKH |
40 | /* must be 1st field |
41 | * FIXME this is a bug */ | |
ff568d3a GKH |
42 | /* point back to our device context */ |
43 | struct device_context *device_ctx; | |
44 | struct kmem_cache *request_pool; | |
45 | unsigned int port; | |
46 | unsigned char path; | |
47 | unsigned char target; | |
bef4a34a HJ |
48 | }; |
49 | ||
50 | struct storvsc_cmd_request { | |
ff568d3a GKH |
51 | struct list_head entry; |
52 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
53 | |
54 | unsigned int bounce_sgl_count; | |
ff568d3a | 55 | struct scatterlist *bounce_sgl; |
bef4a34a | 56 | |
0b3f6834 | 57 | struct hv_storvsc_request request; |
454f18a9 | 58 | /* !!!DO NOT ADD ANYTHING BELOW HERE!!! */ |
ff568d3a GKH |
59 | /* The extension buffer falls right here and is pointed to by |
60 | * request.Extension; | |
61 | * Which sounds like a very bad design... */ | |
bef4a34a HJ |
62 | }; |
63 | ||
64 | struct storvsc_driver_context { | |
454f18a9 | 65 | /* !! These must be the first 2 fields !! */ |
ff568d3a GKH |
66 | /* FIXME this is a bug... */ |
67 | struct driver_context drv_ctx; | |
9f0c7d2c | 68 | struct storvsc_driver_object drv_obj; |
bef4a34a HJ |
69 | }; |
70 | ||
454f18a9 | 71 | /* Static decl */ |
bef4a34a | 72 | static int storvsc_probe(struct device *dev); |
ff568d3a GKH |
73 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, |
74 | void (*done)(struct scsi_cmnd *)); | |
bef4a34a HJ |
75 | static int storvsc_device_alloc(struct scsi_device *); |
76 | static int storvsc_device_configure(struct scsi_device *); | |
77 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
bef4a34a HJ |
78 | static int storvsc_remove(struct device *dev); |
79 | ||
ff568d3a GKH |
80 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
81 | unsigned int sg_count, | |
82 | unsigned int len); | |
83 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
84 | unsigned int sg_count); | |
bef4a34a | 85 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
86 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
87 | struct scatterlist *bounce_sgl, | |
88 | unsigned int orig_sgl_count); | |
89 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
90 | struct scatterlist *bounce_sgl, | |
91 | unsigned int orig_sgl_count); | |
bef4a34a | 92 | |
ff568d3a GKH |
93 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
94 | sector_t capacity, int *info); | |
bef4a34a HJ |
95 | |
96 | ||
97 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
98 | ||
454f18a9 | 99 | /* The one and only one */ |
bef4a34a HJ |
100 | static struct storvsc_driver_context g_storvsc_drv; |
101 | ||
454f18a9 | 102 | /* Scsi driver */ |
bef4a34a | 103 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
104 | .module = THIS_MODULE, |
105 | .name = "storvsc_host_t", | |
106 | .bios_param = storvsc_get_chs, | |
107 | .queuecommand = storvsc_queuecommand, | |
108 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
109 | .slave_alloc = storvsc_device_alloc, | |
110 | .slave_configure = storvsc_device_configure, | |
111 | .cmd_per_lun = 1, | |
112 | /* 64 max_queue * 1 target */ | |
113 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, | |
114 | .this_id = -1, | |
454f18a9 | 115 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
116 | /* currently 32 */ |
117 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
118 | /* | |
119 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
120 | * into 1 sg element. If set, we must limit the max_segment_size to | |
121 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
122 | * multiple | |
123 | */ | |
454f18a9 | 124 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 125 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 126 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 127 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
128 | }; |
129 | ||
130 | ||
ff568d3a GKH |
131 | /** |
132 | * storvsc_drv_init - StorVsc driver initialization. | |
133 | */ | |
21707bed | 134 | static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
bef4a34a | 135 | { |
ff568d3a | 136 | int ret; |
9f0c7d2c | 137 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a | 138 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
bef4a34a HJ |
139 | |
140 | DPRINT_ENTER(STORVSC_DRV); | |
141 | ||
142 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
143 | ||
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 HJ |
173 | |
174 | DPRINT_EXIT(STORVSC_DRV); | |
175 | ||
176 | return ret; | |
177 | } | |
178 | ||
bef4a34a HJ |
179 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
180 | { | |
181 | struct device **curr = (struct device **)data; | |
182 | *curr = dev; | |
454f18a9 | 183 | return 1; /* stop iterating */ |
bef4a34a HJ |
184 | } |
185 | ||
bd1de709 | 186 | static void storvsc_drv_exit(void) |
bef4a34a | 187 | { |
9f0c7d2c | 188 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a GKH |
189 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
190 | struct device *current_dev = NULL; | |
2295ba2e | 191 | int ret; |
bef4a34a | 192 | |
bef4a34a HJ |
193 | DPRINT_ENTER(STORVSC_DRV); |
194 | ||
ff568d3a | 195 | while (1) { |
bef4a34a HJ |
196 | current_dev = NULL; |
197 | ||
454f18a9 | 198 | /* Get the device */ |
2295ba2e BP |
199 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
200 | (void *) ¤t_dev, | |
201 | storvsc_drv_exit_cb); | |
202 | ||
203 | if (ret) | |
204 | DPRINT_WARN(STORVSC_DRV, | |
205 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
206 | |
207 | if (current_dev == NULL) | |
208 | break; | |
209 | ||
454f18a9 | 210 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
211 | device_unregister(current_dev); |
212 | } | |
213 | ||
214 | if (storvsc_drv_obj->Base.OnCleanup) | |
215 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
216 | ||
217 | vmbus_child_driver_unregister(drv_ctx); | |
218 | ||
219 | DPRINT_EXIT(STORVSC_DRV); | |
220 | ||
221 | return; | |
222 | } | |
223 | ||
ff568d3a GKH |
224 | /** |
225 | * storvsc_probe - Add a new device for this driver | |
226 | */ | |
bef4a34a HJ |
227 | static int storvsc_probe(struct device *device) |
228 | { | |
ff568d3a GKH |
229 | int ret; |
230 | struct driver_context *driver_ctx = | |
231 | driver_to_driver_context(device->driver); | |
232 | struct storvsc_driver_context *storvsc_drv_ctx = | |
233 | (struct storvsc_driver_context *)driver_ctx; | |
234 | struct storvsc_driver_object *storvsc_drv_obj = | |
235 | &storvsc_drv_ctx->drv_obj; | |
bef4a34a | 236 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 237 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a HJ |
238 | struct Scsi_Host *host; |
239 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 240 | struct storvsc_device_info device_info; |
bef4a34a HJ |
241 | |
242 | DPRINT_ENTER(STORVSC_DRV); | |
243 | ||
244 | if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
245 | return -1; | |
246 | ||
ff568d3a GKH |
247 | host = scsi_host_alloc(&scsi_driver, |
248 | sizeof(struct host_device_context)); | |
249 | if (!host) { | |
bef4a34a HJ |
250 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
251 | return -ENOMEM; | |
252 | } | |
253 | ||
0883c52b | 254 | dev_set_drvdata(device, host); |
bef4a34a | 255 | |
ff568d3a | 256 | host_device_ctx = (struct host_device_context *)host->hostdata; |
bef4a34a HJ |
257 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
258 | ||
259 | host_device_ctx->port = host->host_no; | |
260 | host_device_ctx->device_ctx = device_ctx; | |
261 | ||
bef4a34a | 262 | host_device_ctx->request_pool = |
ff568d3a GKH |
263 | kmem_cache_create(dev_name(&device_ctx->device), |
264 | sizeof(struct storvsc_cmd_request) + | |
265 | storvsc_drv_obj->RequestExtSize, 0, | |
266 | SLAB_HWCACHE_ALIGN, NULL); | |
267 | ||
268 | if (!host_device_ctx->request_pool) { | |
bef4a34a HJ |
269 | scsi_host_put(host); |
270 | DPRINT_EXIT(STORVSC_DRV); | |
271 | ||
272 | return -ENOMEM; | |
273 | } | |
274 | ||
275 | device_info.PortNumber = host->host_no; | |
454f18a9 | 276 | /* Call to the vsc driver to add the device */ |
ff568d3a GKH |
277 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, |
278 | (void *)&device_info); | |
279 | if (ret != 0) { | |
bef4a34a HJ |
280 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
281 | kmem_cache_destroy(host_device_ctx->request_pool); | |
282 | scsi_host_put(host); | |
283 | DPRINT_EXIT(STORVSC_DRV); | |
284 | ||
285 | return -1; | |
286 | } | |
287 | ||
454f18a9 | 288 | /* host_device_ctx->port = device_info.PortNumber; */ |
bef4a34a HJ |
289 | host_device_ctx->path = device_info.PathId; |
290 | host_device_ctx->target = device_info.TargetId; | |
291 | ||
ff568d3a GKH |
292 | /* max # of devices per target */ |
293 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
294 | /* max # of targets per channel */ | |
295 | host->max_id = STORVSC_MAX_TARGETS; | |
296 | /* max # of channels */ | |
297 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 298 | |
454f18a9 | 299 | /* Register the HBA and start the scsi bus scan */ |
bef4a34a | 300 | ret = scsi_add_host(host, device); |
ff568d3a | 301 | if (ret != 0) { |
bef4a34a HJ |
302 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
303 | ||
304 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
305 | ||
306 | kmem_cache_destroy(host_device_ctx->request_pool); | |
307 | scsi_host_put(host); | |
308 | DPRINT_EXIT(STORVSC_DRV); | |
309 | ||
310 | return -1; | |
311 | } | |
312 | ||
313 | scsi_scan_host(host); | |
314 | ||
315 | DPRINT_EXIT(STORVSC_DRV); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
ff568d3a GKH |
320 | /** |
321 | * storvsc_remove - Callback when our device is removed | |
322 | */ | |
bef4a34a HJ |
323 | static int storvsc_remove(struct device *device) |
324 | { | |
ff568d3a GKH |
325 | int ret; |
326 | struct driver_context *driver_ctx = | |
327 | driver_to_driver_context(device->driver); | |
328 | struct storvsc_driver_context *storvsc_drv_ctx = | |
329 | (struct storvsc_driver_context *)driver_ctx; | |
330 | struct storvsc_driver_object *storvsc_drv_obj = | |
331 | &storvsc_drv_ctx->drv_obj; | |
bef4a34a | 332 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 333 | struct hv_device *device_obj = &device_ctx->device_obj; |
0883c52b | 334 | struct Scsi_Host *host = dev_get_drvdata(device); |
ff568d3a GKH |
335 | struct host_device_context *host_device_ctx = |
336 | (struct host_device_context *)host->hostdata; | |
bef4a34a HJ |
337 | |
338 | ||
339 | DPRINT_ENTER(STORVSC_DRV); | |
340 | ||
ff568d3a | 341 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
bef4a34a HJ |
342 | DPRINT_EXIT(STORVSC_DRV); |
343 | return -1; | |
344 | } | |
345 | ||
ff568d3a GKH |
346 | /* |
347 | * Call to the vsc driver to let it know that the device is being | |
348 | * removed | |
349 | */ | |
bef4a34a | 350 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
ff568d3a | 351 | if (ret != 0) { |
454f18a9 | 352 | /* TODO: */ |
ff568d3a GKH |
353 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", |
354 | ret); | |
bef4a34a HJ |
355 | } |
356 | ||
ff568d3a | 357 | if (host_device_ctx->request_pool) { |
bef4a34a HJ |
358 | kmem_cache_destroy(host_device_ctx->request_pool); |
359 | host_device_ctx->request_pool = NULL; | |
360 | } | |
361 | ||
362 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
363 | scsi_remove_host(host); | |
364 | ||
365 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
366 | scsi_host_put(host); | |
367 | ||
368 | DPRINT_EXIT(STORVSC_DRV); | |
369 | ||
370 | return ret; | |
371 | } | |
372 | ||
ff568d3a GKH |
373 | /** |
374 | * storvsc_commmand_completion - Command completion processing | |
375 | */ | |
0b3f6834 | 376 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 377 | { |
ff568d3a GKH |
378 | struct storvsc_cmd_request *cmd_request = |
379 | (struct storvsc_cmd_request *)request->Context; | |
bef4a34a | 380 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
ff568d3a GKH |
381 | struct host_device_context *host_device_ctx = |
382 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 383 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 384 | struct scsi_sense_hdr sense_hdr; |
bef4a34a HJ |
385 | |
386 | ASSERT(request == &cmd_request->request); | |
ff568d3a GKH |
387 | ASSERT((unsigned long)scmnd->host_scribble == |
388 | (unsigned long)cmd_request); | |
bef4a34a HJ |
389 | ASSERT(scmnd); |
390 | ASSERT(scmnd->scsi_done); | |
391 | ||
392 | DPRINT_ENTER(STORVSC_DRV); | |
393 | ||
ff568d3a GKH |
394 | if (cmd_request->bounce_sgl_count) { |
395 | /* using bounce buffer */ | |
454f18a9 | 396 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 397 | |
454f18a9 | 398 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
399 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
400 | cmd_request->bounce_sgl, | |
401 | scsi_sg_count(scmnd)); | |
402 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
403 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
404 | } |
405 | ||
406 | scmnd->result = request->Status; | |
407 | ||
ff568d3a GKH |
408 | if (scmnd->result) { |
409 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
410 | request->SenseBufferSize, &sense_hdr)) | |
bef4a34a | 411 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
412 | } |
413 | ||
414 | ASSERT(request->BytesXfer <= request->DataBuffer.Length); | |
bef4a34a | 415 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
416 | |
417 | scsi_done_fn = scmnd->scsi_done; | |
418 | ||
419 | scmnd->host_scribble = NULL; | |
420 | scmnd->scsi_done = NULL; | |
421 | ||
454f18a9 | 422 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
423 | scsi_done_fn(scmnd); |
424 | ||
425 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
426 | ||
427 | DPRINT_EXIT(STORVSC_DRV); | |
428 | } | |
429 | ||
430 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
431 | { | |
ff568d3a | 432 | int i; |
bef4a34a | 433 | |
454f18a9 | 434 | /* No need to check */ |
bef4a34a HJ |
435 | if (sg_count < 2) |
436 | return -1; | |
437 | ||
454f18a9 | 438 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
439 | for (i = 0; i < sg_count; i++) { |
440 | if (i == 0) { | |
441 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
442 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
443 | return i; | |
ff568d3a GKH |
444 | } else if (i == sg_count - 1) { |
445 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
446 | if (sgl[i].offset != 0) |
447 | return i; | |
ff568d3a GKH |
448 | } else { |
449 | /* make sure no hole in the middle */ | |
bef4a34a | 450 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 451 | return i; |
bef4a34a HJ |
452 | } |
453 | } | |
454 | return -1; | |
455 | } | |
456 | ||
ff568d3a GKH |
457 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
458 | unsigned int sg_count, | |
459 | unsigned int len) | |
bef4a34a HJ |
460 | { |
461 | int i; | |
ff568d3a GKH |
462 | int num_pages; |
463 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
464 | struct page *page_buf; |
465 | ||
466 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
467 | ||
06da0bc8 | 468 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 469 | if (!bounce_sgl) |
bef4a34a | 470 | return NULL; |
bef4a34a | 471 | |
ff568d3a | 472 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
473 | page_buf = alloc_page(GFP_ATOMIC); |
474 | if (!page_buf) | |
bef4a34a | 475 | goto cleanup; |
bef4a34a | 476 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
477 | } |
478 | ||
479 | return bounce_sgl; | |
480 | ||
481 | cleanup: | |
482 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
483 | return NULL; | |
484 | } | |
485 | ||
ff568d3a GKH |
486 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
487 | unsigned int sg_count) | |
bef4a34a HJ |
488 | { |
489 | int i; | |
490 | struct page *page_buf; | |
491 | ||
ff568d3a GKH |
492 | for (i = 0; i < sg_count; i++) { |
493 | page_buf = sg_page((&sgl[i])); | |
494 | if (page_buf != NULL) | |
bef4a34a | 495 | __free_page(page_buf); |
bef4a34a HJ |
496 | } |
497 | ||
498 | kfree(sgl); | |
499 | } | |
500 | ||
454f18a9 | 501 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
502 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
503 | struct scatterlist *bounce_sgl, | |
504 | unsigned int orig_sgl_count) | |
bef4a34a | 505 | { |
ff568d3a GKH |
506 | int i; |
507 | int j = 0; | |
bef4a34a HJ |
508 | unsigned long src, dest; |
509 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
510 | unsigned int total_copied = 0; |
511 | unsigned long bounce_addr = 0; | |
512 | unsigned long src_addr = 0; | |
bef4a34a HJ |
513 | unsigned long flags; |
514 | ||
515 | local_irq_save(flags); | |
516 | ||
ff568d3a GKH |
517 | for (i = 0; i < orig_sgl_count; i++) { |
518 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
519 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
520 | src = src_addr; |
521 | srclen = orig_sgl[i].length; | |
522 | ||
bef4a34a HJ |
523 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
524 | ||
525 | if (j == 0) | |
bef4a34a | 526 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 527 | |
ff568d3a | 528 | while (srclen) { |
454f18a9 | 529 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
530 | dest = bounce_addr + bounce_sgl[j].length; |
531 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
532 | ||
fc6a4b26 | 533 | copylen = min(srclen, destlen); |
ff568d3a | 534 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
535 | |
536 | total_copied += copylen; | |
537 | bounce_sgl[j].length += copylen; | |
538 | srclen -= copylen; | |
539 | src += copylen; | |
540 | ||
ff568d3a GKH |
541 | if (bounce_sgl[j].length == PAGE_SIZE) { |
542 | /* full..move to next entry */ | |
543 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
544 | j++; |
545 | ||
454f18a9 | 546 | /* if we need to use another bounce buffer */ |
ff568d3a | 547 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 548 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
549 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
550 | /* unmap the last bounce that is < PAGE_SIZE */ | |
551 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
552 | } |
553 | } | |
554 | ||
ff568d3a | 555 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
556 | } |
557 | ||
558 | local_irq_restore(flags); | |
559 | ||
560 | return total_copied; | |
561 | } | |
562 | ||
454f18a9 | 563 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
564 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
565 | struct scatterlist *bounce_sgl, | |
566 | unsigned int orig_sgl_count) | |
bef4a34a | 567 | { |
ff568d3a GKH |
568 | int i; |
569 | int j = 0; | |
bef4a34a HJ |
570 | unsigned long src, dest; |
571 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
572 | unsigned int total_copied = 0; |
573 | unsigned long bounce_addr = 0; | |
574 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
575 | unsigned long flags; |
576 | ||
577 | local_irq_save(flags); | |
578 | ||
ff568d3a GKH |
579 | for (i = 0; i < orig_sgl_count; i++) { |
580 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
581 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
582 | dest = dest_addr; |
583 | destlen = orig_sgl[i].length; | |
584 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
585 | ||
586 | if (j == 0) | |
bef4a34a | 587 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 588 | |
ff568d3a | 589 | while (destlen) { |
bef4a34a HJ |
590 | src = bounce_addr + bounce_sgl[j].offset; |
591 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
592 | ||
fc6a4b26 | 593 | copylen = min(srclen, destlen); |
ff568d3a | 594 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
595 | |
596 | total_copied += copylen; | |
597 | bounce_sgl[j].offset += copylen; | |
598 | destlen -= copylen; | |
599 | dest += copylen; | |
600 | ||
ff568d3a GKH |
601 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
602 | /* full */ | |
603 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
604 | j++; |
605 | ||
454f18a9 | 606 | /* if we need to use another bounce buffer */ |
ff568d3a | 607 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 608 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
609 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
610 | /* unmap the last bounce that is < PAGE_SIZE */ | |
611 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
612 | } |
613 | } | |
614 | ||
ff568d3a GKH |
615 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
616 | KM_IRQ0); | |
bef4a34a HJ |
617 | } |
618 | ||
619 | local_irq_restore(flags); | |
620 | ||
621 | return total_copied; | |
622 | } | |
623 | ||
ff568d3a GKH |
624 | /** |
625 | * storvsc_queuecommand - Initiate command processing | |
626 | */ | |
627 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, | |
628 | void (*done)(struct scsi_cmnd *)) | |
bef4a34a | 629 | { |
ff568d3a GKH |
630 | int ret; |
631 | struct host_device_context *host_device_ctx = | |
632 | (struct host_device_context *)scmnd->device->host->hostdata; | |
633 | struct device_context *device_ctx = host_device_ctx->device_ctx; | |
634 | struct driver_context *driver_ctx = | |
635 | driver_to_driver_context(device_ctx->device.driver); | |
636 | struct storvsc_driver_context *storvsc_drv_ctx = | |
637 | (struct storvsc_driver_context *)driver_ctx; | |
638 | struct storvsc_driver_object *storvsc_drv_obj = | |
639 | &storvsc_drv_ctx->drv_obj; | |
0b3f6834 | 640 | struct hv_storvsc_request *request; |
bef4a34a | 641 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 642 | unsigned int request_size = 0; |
bef4a34a HJ |
643 | int i; |
644 | struct scatterlist *sgl; | |
645 | ||
646 | DPRINT_ENTER(STORVSC_DRV); | |
647 | ||
ff568d3a GKH |
648 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
649 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
650 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
651 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
652 | scmnd->device->tagged_supported); | |
bef4a34a | 653 | |
454f18a9 | 654 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 655 | if (scmnd->host_scribble) { |
bef4a34a HJ |
656 | ASSERT(scmnd->scsi_done != NULL); |
657 | ||
ff568d3a GKH |
658 | cmd_request = |
659 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
660 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
661 | scmnd, cmd_request); | |
bef4a34a HJ |
662 | |
663 | goto retry_request; | |
664 | } | |
665 | ||
666 | ASSERT(scmnd->scsi_done == NULL); | |
667 | ASSERT(scmnd->host_scribble == NULL); | |
668 | ||
669 | scmnd->scsi_done = done; | |
670 | ||
671 | request_size = sizeof(struct storvsc_cmd_request); | |
672 | ||
ff568d3a GKH |
673 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, |
674 | GFP_ATOMIC); | |
675 | if (!cmd_request) { | |
676 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
677 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
678 | scmnd->scsi_done = NULL; |
679 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
680 | } | |
681 | ||
454f18a9 | 682 | /* Setup the cmd request */ |
bef4a34a HJ |
683 | cmd_request->bounce_sgl_count = 0; |
684 | cmd_request->bounce_sgl = NULL; | |
685 | cmd_request->cmd = scmnd; | |
686 | ||
ff568d3a | 687 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
688 | |
689 | request = &cmd_request->request; | |
690 | ||
ff568d3a GKH |
691 | request->Extension = |
692 | (void *)((unsigned long)cmd_request + request_size); | |
693 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, | |
694 | storvsc_drv_obj->RequestExtSize); | |
bef4a34a | 695 | |
454f18a9 | 696 | /* Build the SRB */ |
ff568d3a | 697 | switch (scmnd->sc_data_direction) { |
bef4a34a HJ |
698 | case DMA_TO_DEVICE: |
699 | request->Type = WRITE_TYPE; | |
700 | break; | |
701 | case DMA_FROM_DEVICE: | |
702 | request->Type = READ_TYPE; | |
703 | break; | |
704 | default: | |
705 | request->Type = UNKNOWN_TYPE; | |
706 | break; | |
707 | } | |
708 | ||
709 | request->OnIOCompletion = storvsc_commmand_completion; | |
454f18a9 | 710 | request->Context = cmd_request;/* scmnd; */ |
bef4a34a | 711 | |
454f18a9 | 712 | /* request->PortId = scmnd->device->channel; */ |
bef4a34a HJ |
713 | request->Host = host_device_ctx->port; |
714 | request->Bus = scmnd->device->channel; | |
715 | request->TargetId = scmnd->device->id; | |
716 | request->LunId = scmnd->device->lun; | |
717 | ||
718 | ASSERT(scmnd->cmd_len <= 16); | |
719 | request->CdbLen = scmnd->cmd_len; | |
720 | request->Cdb = scmnd->cmnd; | |
721 | ||
722 | request->SenseBuffer = scmnd->sense_buffer; | |
723 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
724 | ||
725 | ||
bef4a34a | 726 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
ff568d3a GKH |
727 | if (scsi_sg_count(scmnd)) { |
728 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
bef4a34a | 729 | |
454f18a9 | 730 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
731 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
732 | DPRINT_INFO(STORVSC_DRV, | |
733 | "need to bounce buffer for this scmnd %p", | |
734 | scmnd); | |
735 | cmd_request->bounce_sgl = | |
736 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
737 | scsi_bufflen(scmnd)); | |
738 | if (!cmd_request->bounce_sgl) { | |
739 | DPRINT_ERR(STORVSC_DRV, | |
740 | "unable to create bounce buffer for " | |
741 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
742 | |
743 | scmnd->scsi_done = NULL; | |
744 | scmnd->host_scribble = NULL; | |
ff568d3a GKH |
745 | kmem_cache_free(host_device_ctx->request_pool, |
746 | cmd_request); | |
bef4a34a HJ |
747 | |
748 | return SCSI_MLQUEUE_HOST_BUSY; | |
749 | } | |
750 | ||
ff568d3a GKH |
751 | cmd_request->bounce_sgl_count = |
752 | ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
753 | PAGE_SHIFT; | |
bef4a34a | 754 | |
ff568d3a GKH |
755 | /* |
756 | * FIXME: We can optimize on reads by just skipping | |
757 | * this | |
758 | */ | |
759 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
760 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
761 | |
762 | sgl = cmd_request->bounce_sgl; | |
763 | } | |
764 | ||
765 | request->DataBuffer.Offset = sgl[0].offset; | |
766 | ||
ff568d3a GKH |
767 | for (i = 0; i < scsi_sg_count(scmnd); i++) { |
768 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", | |
769 | i, sgl[i].length, sgl[i].offset); | |
770 | request->DataBuffer.PfnArray[i] = | |
771 | page_to_pfn(sg_page((&sgl[i]))); | |
bef4a34a | 772 | } |
ff568d3a | 773 | } else if (scsi_sglist(scmnd)) { |
bef4a34a | 774 | ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); |
ff568d3a GKH |
775 | request->DataBuffer.Offset = |
776 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
777 | request->DataBuffer.PfnArray[0] = | |
778 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
779 | } else { | |
bef4a34a HJ |
780 | ASSERT(scsi_bufflen(scmnd) == 0); |
781 | } | |
bef4a34a HJ |
782 | |
783 | retry_request: | |
454f18a9 | 784 | /* Invokes the vsc to start an IO */ |
ff568d3a GKH |
785 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, |
786 | &cmd_request->request); | |
787 | if (ret == -1) { | |
788 | /* no more space */ | |
789 | DPRINT_ERR(STORVSC_DRV, | |
790 | "scmnd (%p) - queue FULL...marking queue busy", | |
791 | scmnd); | |
792 | ||
793 | if (cmd_request->bounce_sgl_count) { | |
794 | /* | |
795 | * FIXME: We can optimize on writes by just skipping | |
796 | * this | |
797 | */ | |
798 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
799 | cmd_request->bounce_sgl, | |
800 | scsi_sg_count(scmnd)); | |
801 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
802 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
803 | } |
804 | ||
805 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
806 | ||
807 | scmnd->scsi_done = NULL; | |
808 | scmnd->host_scribble = NULL; | |
809 | ||
810 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
811 | } | |
812 | ||
813 | DPRINT_EXIT(STORVSC_DRV); | |
814 | ||
815 | return ret; | |
816 | } | |
817 | ||
ff568d3a GKH |
818 | static int storvsc_merge_bvec(struct request_queue *q, |
819 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 820 | { |
ff568d3a GKH |
821 | /* checking done by caller. */ |
822 | return bvec->bv_len; | |
bef4a34a | 823 | } |
bef4a34a | 824 | |
ff568d3a GKH |
825 | /** |
826 | * storvsc_device_configure - Configure the specified scsi device | |
827 | */ | |
bef4a34a HJ |
828 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
829 | { | |
ff568d3a GKH |
830 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
831 | sdevice, BLIST_SPARSELUN); | |
832 | /* | |
833 | * This enables luns to be located sparsely. Otherwise, we may not | |
834 | * discovered them. | |
835 | */ | |
bef4a34a | 836 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
837 | return 0; |
838 | } | |
839 | ||
840 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
841 | { | |
ff568d3a GKH |
842 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
843 | sdevice->queue_depth); | |
bef4a34a | 844 | |
ff568d3a GKH |
845 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
846 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
847 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
848 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 849 | |
ff568d3a GKH |
850 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
851 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
852 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
853 | ||
ff568d3a GKH |
854 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
855 | sdevice); | |
bef4a34a HJ |
856 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
857 | ||
858 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 859 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
860 | |
861 | return 0; | |
862 | } | |
863 | ||
ff568d3a GKH |
864 | /** |
865 | * storvsc_host_reset_handler - Reset the scsi HBA | |
866 | */ | |
bef4a34a HJ |
867 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
868 | { | |
ff568d3a GKH |
869 | int ret; |
870 | struct host_device_context *host_device_ctx = | |
871 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 872 | struct device_context *device_ctx = host_device_ctx->device_ctx; |
bef4a34a HJ |
873 | |
874 | DPRINT_ENTER(STORVSC_DRV); | |
875 | ||
ff568d3a GKH |
876 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
877 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a | 878 | |
454f18a9 | 879 | /* Invokes the vsc to reset the host/bus */ |
354b0a64 | 880 | ret = StorVscOnHostReset(&device_ctx->device_obj); |
ff568d3a | 881 | if (ret != 0) { |
bef4a34a HJ |
882 | DPRINT_EXIT(STORVSC_DRV); |
883 | return ret; | |
884 | } | |
885 | ||
ff568d3a GKH |
886 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
887 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a HJ |
888 | |
889 | DPRINT_EXIT(STORVSC_DRV); | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
ff568d3a GKH |
894 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
895 | sector_t capacity, int *info) | |
bef4a34a HJ |
896 | { |
897 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
898 | sector_t cylinder_times_heads = 0; |
899 | sector_t temp = 0; | |
bef4a34a | 900 | |
ff568d3a GKH |
901 | int sectors_per_track = 0; |
902 | int heads = 0; | |
903 | int cylinders = 0; | |
904 | int rem = 0; | |
bef4a34a | 905 | |
ff568d3a GKH |
906 | if (total_sectors > (65535 * 16 * 255)) |
907 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 908 | |
ff568d3a GKH |
909 | if (total_sectors >= (65535 * 16 * 63)) { |
910 | sectors_per_track = 255; | |
911 | heads = 16; | |
bef4a34a HJ |
912 | |
913 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
914 | /* sector_div stores the quotient in cylinder_times_heads */ |
915 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
916 | } else { | |
917 | sectors_per_track = 17; | |
bef4a34a HJ |
918 | |
919 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
920 | /* sector_div stores the quotient in cylinder_times_heads */ |
921 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
922 | |
923 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
924 | /* sector_div stores the quotient in temp */ |
925 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
926 | |
927 | heads = temp; | |
928 | ||
ff568d3a GKH |
929 | if (heads < 4) |
930 | heads = 4; | |
bef4a34a | 931 | |
ff568d3a GKH |
932 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
933 | sectors_per_track = 31; | |
934 | heads = 16; | |
bef4a34a HJ |
935 | |
936 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
937 | /* |
938 | * sector_div stores the quotient in | |
939 | * cylinder_times_heads | |
940 | */ | |
941 | rem = sector_div(cylinder_times_heads, | |
942 | sectors_per_track); | |
943 | } | |
bef4a34a | 944 | |
ff568d3a GKH |
945 | if (cylinder_times_heads >= (heads * 1024)) { |
946 | sectors_per_track = 63; | |
947 | heads = 16; | |
bef4a34a HJ |
948 | |
949 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
950 | /* |
951 | * sector_div stores the quotient in | |
952 | * cylinder_times_heads | |
953 | */ | |
954 | rem = sector_div(cylinder_times_heads, | |
955 | sectors_per_track); | |
956 | } | |
957 | } | |
bef4a34a HJ |
958 | |
959 | temp = cylinder_times_heads; | |
ff568d3a GKH |
960 | /* sector_div stores the quotient in temp */ |
961 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
962 | cylinders = temp; |
963 | ||
964 | info[0] = heads; | |
ff568d3a GKH |
965 | info[1] = sectors_per_track; |
966 | info[2] = cylinders; | |
bef4a34a | 967 | |
ff568d3a GKH |
968 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
969 | sectors_per_track); | |
bef4a34a HJ |
970 | |
971 | return 0; | |
972 | } | |
973 | ||
bef4a34a HJ |
974 | static int __init storvsc_init(void) |
975 | { | |
976 | int ret; | |
977 | ||
978 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 979 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
bef4a34a | 980 | ret = storvsc_drv_init(StorVscInitialize); |
bef4a34a | 981 | DPRINT_EXIT(STORVSC_DRV); |
bef4a34a HJ |
982 | return ret; |
983 | } | |
984 | ||
985 | static void __exit storvsc_exit(void) | |
986 | { | |
987 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 988 | storvsc_drv_exit(); |
bef4a34a HJ |
989 | DPRINT_ENTER(STORVSC_DRV); |
990 | } | |
991 | ||
ff568d3a | 992 | MODULE_LICENSE("GPL"); |
bef4a34a | 993 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
bef4a34a HJ |
994 | module_init(storvsc_init); |
995 | module_exit(storvsc_exit); |