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" |
26c14cc1 | 35 | #include "VersionInfo.h" |
870cde80 | 36 | #include "vmbus.h" |
731a7884 | 37 | #include "StorVscApi.h" |
bef4a34a | 38 | |
bef4a34a | 39 | |
bef4a34a | 40 | struct host_device_context { |
ff568d3a GKH |
41 | /* must be 1st field |
42 | * FIXME this is a bug */ | |
ff568d3a | 43 | /* point back to our device context */ |
f916a34d | 44 | struct vm_device *device_ctx; |
ff568d3a GKH |
45 | struct kmem_cache *request_pool; |
46 | unsigned int port; | |
47 | unsigned char path; | |
48 | unsigned char target; | |
bef4a34a HJ |
49 | }; |
50 | ||
51 | struct storvsc_cmd_request { | |
ff568d3a GKH |
52 | struct list_head entry; |
53 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
54 | |
55 | unsigned int bounce_sgl_count; | |
ff568d3a | 56 | struct scatterlist *bounce_sgl; |
bef4a34a | 57 | |
0b3f6834 | 58 | struct hv_storvsc_request request; |
454f18a9 | 59 | /* !!!DO NOT ADD ANYTHING BELOW HERE!!! */ |
ff568d3a GKH |
60 | /* The extension buffer falls right here and is pointed to by |
61 | * request.Extension; | |
62 | * Which sounds like a very bad design... */ | |
bef4a34a HJ |
63 | }; |
64 | ||
65 | struct storvsc_driver_context { | |
454f18a9 | 66 | /* !! These must be the first 2 fields !! */ |
ff568d3a GKH |
67 | /* FIXME this is a bug... */ |
68 | struct driver_context drv_ctx; | |
9f0c7d2c | 69 | struct storvsc_driver_object drv_obj; |
bef4a34a HJ |
70 | }; |
71 | ||
454f18a9 | 72 | /* Static decl */ |
bef4a34a | 73 | static int storvsc_probe(struct device *dev); |
ff568d3a GKH |
74 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, |
75 | void (*done)(struct scsi_cmnd *)); | |
bef4a34a HJ |
76 | static int storvsc_device_alloc(struct scsi_device *); |
77 | static int storvsc_device_configure(struct scsi_device *); | |
78 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
bef4a34a HJ |
79 | static int storvsc_remove(struct device *dev); |
80 | ||
ff568d3a GKH |
81 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
82 | unsigned int sg_count, | |
83 | unsigned int len); | |
84 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
85 | unsigned int sg_count); | |
bef4a34a | 86 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
87 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
88 | struct scatterlist *bounce_sgl, | |
89 | unsigned int orig_sgl_count); | |
90 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
91 | struct scatterlist *bounce_sgl, | |
92 | unsigned int orig_sgl_count); | |
bef4a34a | 93 | |
ff568d3a GKH |
94 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
95 | sector_t capacity, int *info); | |
bef4a34a HJ |
96 | |
97 | ||
98 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
99 | ||
454f18a9 | 100 | /* The one and only one */ |
bef4a34a HJ |
101 | static struct storvsc_driver_context g_storvsc_drv; |
102 | ||
454f18a9 | 103 | /* Scsi driver */ |
bef4a34a | 104 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
105 | .module = THIS_MODULE, |
106 | .name = "storvsc_host_t", | |
107 | .bios_param = storvsc_get_chs, | |
108 | .queuecommand = storvsc_queuecommand, | |
109 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
110 | .slave_alloc = storvsc_device_alloc, | |
111 | .slave_configure = storvsc_device_configure, | |
112 | .cmd_per_lun = 1, | |
113 | /* 64 max_queue * 1 target */ | |
114 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, | |
115 | .this_id = -1, | |
454f18a9 | 116 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
117 | /* currently 32 */ |
118 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
119 | /* | |
120 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
121 | * into 1 sg element. If set, we must limit the max_segment_size to | |
122 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
123 | * multiple | |
124 | */ | |
454f18a9 | 125 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 126 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 127 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 128 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
129 | }; |
130 | ||
131 | ||
ff568d3a GKH |
132 | /** |
133 | * storvsc_drv_init - StorVsc driver initialization. | |
134 | */ | |
21707bed | 135 | static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
bef4a34a | 136 | { |
ff568d3a | 137 | int ret; |
9f0c7d2c | 138 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a | 139 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
bef4a34a HJ |
140 | |
141 | DPRINT_ENTER(STORVSC_DRV); | |
142 | ||
143 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
144 | ||
145 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; | |
bef4a34a | 146 | |
454f18a9 | 147 | /* Callback to client driver to complete the initialization */ |
21707bed | 148 | drv_init(&storvsc_drv_obj->Base); |
bef4a34a | 149 | |
ff568d3a GKH |
150 | DPRINT_INFO(STORVSC_DRV, |
151 | "request extension size %u, max outstanding reqs %u", | |
152 | storvsc_drv_obj->RequestExtSize, | |
153 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
154 | ||
155 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < | |
156 | STORVSC_MAX_IO_REQUESTS) { | |
157 | DPRINT_ERR(STORVSC_DRV, | |
158 | "The number of outstanding io requests (%d) " | |
159 | "is larger than that supported (%d) internally.", | |
160 | STORVSC_MAX_IO_REQUESTS, | |
161 | storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
bef4a34a HJ |
162 | return -1; |
163 | } | |
164 | ||
165 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
ff568d3a GKH |
166 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
167 | sizeof(struct hv_guid)); | |
bef4a34a | 168 | |
bef4a34a HJ |
169 | drv_ctx->probe = storvsc_probe; |
170 | drv_ctx->remove = storvsc_remove; | |
bef4a34a | 171 | |
454f18a9 | 172 | /* The driver belongs to vmbus */ |
5d48a1c2 | 173 | ret = vmbus_child_driver_register(drv_ctx); |
bef4a34a HJ |
174 | |
175 | DPRINT_EXIT(STORVSC_DRV); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
bef4a34a HJ |
180 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
181 | { | |
182 | struct device **curr = (struct device **)data; | |
183 | *curr = dev; | |
454f18a9 | 184 | return 1; /* stop iterating */ |
bef4a34a HJ |
185 | } |
186 | ||
bd1de709 | 187 | static void storvsc_drv_exit(void) |
bef4a34a | 188 | { |
9f0c7d2c | 189 | struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
ff568d3a GKH |
190 | struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx; |
191 | struct device *current_dev = NULL; | |
2295ba2e | 192 | int ret; |
bef4a34a | 193 | |
bef4a34a HJ |
194 | DPRINT_ENTER(STORVSC_DRV); |
195 | ||
ff568d3a | 196 | while (1) { |
bef4a34a HJ |
197 | current_dev = NULL; |
198 | ||
454f18a9 | 199 | /* Get the device */ |
2295ba2e BP |
200 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
201 | (void *) ¤t_dev, | |
202 | storvsc_drv_exit_cb); | |
203 | ||
204 | if (ret) | |
205 | DPRINT_WARN(STORVSC_DRV, | |
206 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
207 | |
208 | if (current_dev == NULL) | |
209 | break; | |
210 | ||
454f18a9 | 211 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
212 | device_unregister(current_dev); |
213 | } | |
214 | ||
215 | if (storvsc_drv_obj->Base.OnCleanup) | |
216 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
217 | ||
218 | vmbus_child_driver_unregister(drv_ctx); | |
219 | ||
220 | DPRINT_EXIT(STORVSC_DRV); | |
221 | ||
222 | return; | |
223 | } | |
224 | ||
ff568d3a GKH |
225 | /** |
226 | * storvsc_probe - Add a new device for this driver | |
227 | */ | |
bef4a34a HJ |
228 | static int storvsc_probe(struct device *device) |
229 | { | |
ff568d3a GKH |
230 | int ret; |
231 | struct driver_context *driver_ctx = | |
232 | driver_to_driver_context(device->driver); | |
233 | struct storvsc_driver_context *storvsc_drv_ctx = | |
234 | (struct storvsc_driver_context *)driver_ctx; | |
235 | struct storvsc_driver_object *storvsc_drv_obj = | |
236 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 237 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 238 | struct hv_device *device_obj = &device_ctx->device_obj; |
bef4a34a HJ |
239 | struct Scsi_Host *host; |
240 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 241 | struct storvsc_device_info device_info; |
bef4a34a HJ |
242 | |
243 | DPRINT_ENTER(STORVSC_DRV); | |
244 | ||
245 | if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
246 | return -1; | |
247 | ||
ff568d3a GKH |
248 | host = scsi_host_alloc(&scsi_driver, |
249 | sizeof(struct host_device_context)); | |
250 | if (!host) { | |
bef4a34a HJ |
251 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
252 | return -ENOMEM; | |
253 | } | |
254 | ||
0883c52b | 255 | dev_set_drvdata(device, host); |
bef4a34a | 256 | |
ff568d3a | 257 | host_device_ctx = (struct host_device_context *)host->hostdata; |
bef4a34a HJ |
258 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
259 | ||
260 | host_device_ctx->port = host->host_no; | |
261 | host_device_ctx->device_ctx = device_ctx; | |
262 | ||
bef4a34a | 263 | host_device_ctx->request_pool = |
ff568d3a GKH |
264 | kmem_cache_create(dev_name(&device_ctx->device), |
265 | sizeof(struct storvsc_cmd_request) + | |
266 | storvsc_drv_obj->RequestExtSize, 0, | |
267 | SLAB_HWCACHE_ALIGN, NULL); | |
268 | ||
269 | if (!host_device_ctx->request_pool) { | |
bef4a34a HJ |
270 | scsi_host_put(host); |
271 | DPRINT_EXIT(STORVSC_DRV); | |
272 | ||
273 | return -ENOMEM; | |
274 | } | |
275 | ||
276 | device_info.PortNumber = host->host_no; | |
454f18a9 | 277 | /* Call to the vsc driver to add the device */ |
ff568d3a GKH |
278 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, |
279 | (void *)&device_info); | |
280 | if (ret != 0) { | |
bef4a34a HJ |
281 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
282 | kmem_cache_destroy(host_device_ctx->request_pool); | |
283 | scsi_host_put(host); | |
284 | DPRINT_EXIT(STORVSC_DRV); | |
285 | ||
286 | return -1; | |
287 | } | |
288 | ||
454f18a9 | 289 | /* host_device_ctx->port = device_info.PortNumber; */ |
bef4a34a HJ |
290 | host_device_ctx->path = device_info.PathId; |
291 | host_device_ctx->target = device_info.TargetId; | |
292 | ||
ff568d3a GKH |
293 | /* max # of devices per target */ |
294 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
295 | /* max # of targets per channel */ | |
296 | host->max_id = STORVSC_MAX_TARGETS; | |
297 | /* max # of channels */ | |
298 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 299 | |
454f18a9 | 300 | /* Register the HBA and start the scsi bus scan */ |
bef4a34a | 301 | ret = scsi_add_host(host, device); |
ff568d3a | 302 | if (ret != 0) { |
bef4a34a HJ |
303 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
304 | ||
305 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
306 | ||
307 | kmem_cache_destroy(host_device_ctx->request_pool); | |
308 | scsi_host_put(host); | |
309 | DPRINT_EXIT(STORVSC_DRV); | |
310 | ||
311 | return -1; | |
312 | } | |
313 | ||
314 | scsi_scan_host(host); | |
315 | ||
316 | DPRINT_EXIT(STORVSC_DRV); | |
317 | ||
318 | return ret; | |
319 | } | |
320 | ||
ff568d3a GKH |
321 | /** |
322 | * storvsc_remove - Callback when our device is removed | |
323 | */ | |
bef4a34a HJ |
324 | static int storvsc_remove(struct device *device) |
325 | { | |
ff568d3a GKH |
326 | int ret; |
327 | struct driver_context *driver_ctx = | |
328 | driver_to_driver_context(device->driver); | |
329 | struct storvsc_driver_context *storvsc_drv_ctx = | |
330 | (struct storvsc_driver_context *)driver_ctx; | |
331 | struct storvsc_driver_object *storvsc_drv_obj = | |
332 | &storvsc_drv_ctx->drv_obj; | |
f916a34d | 333 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 334 | struct hv_device *device_obj = &device_ctx->device_obj; |
0883c52b | 335 | struct Scsi_Host *host = dev_get_drvdata(device); |
ff568d3a GKH |
336 | struct host_device_context *host_device_ctx = |
337 | (struct host_device_context *)host->hostdata; | |
bef4a34a HJ |
338 | |
339 | ||
340 | DPRINT_ENTER(STORVSC_DRV); | |
341 | ||
ff568d3a | 342 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
bef4a34a HJ |
343 | DPRINT_EXIT(STORVSC_DRV); |
344 | return -1; | |
345 | } | |
346 | ||
ff568d3a GKH |
347 | /* |
348 | * Call to the vsc driver to let it know that the device is being | |
349 | * removed | |
350 | */ | |
bef4a34a | 351 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
ff568d3a | 352 | if (ret != 0) { |
454f18a9 | 353 | /* TODO: */ |
ff568d3a GKH |
354 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", |
355 | ret); | |
bef4a34a HJ |
356 | } |
357 | ||
ff568d3a | 358 | if (host_device_ctx->request_pool) { |
bef4a34a HJ |
359 | kmem_cache_destroy(host_device_ctx->request_pool); |
360 | host_device_ctx->request_pool = NULL; | |
361 | } | |
362 | ||
363 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
364 | scsi_remove_host(host); | |
365 | ||
366 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
367 | scsi_host_put(host); | |
368 | ||
369 | DPRINT_EXIT(STORVSC_DRV); | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
ff568d3a GKH |
374 | /** |
375 | * storvsc_commmand_completion - Command completion processing | |
376 | */ | |
0b3f6834 | 377 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 378 | { |
ff568d3a GKH |
379 | struct storvsc_cmd_request *cmd_request = |
380 | (struct storvsc_cmd_request *)request->Context; | |
bef4a34a | 381 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
ff568d3a GKH |
382 | struct host_device_context *host_device_ctx = |
383 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 384 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 385 | struct scsi_sense_hdr sense_hdr; |
bef4a34a HJ |
386 | |
387 | ASSERT(request == &cmd_request->request); | |
ff568d3a GKH |
388 | ASSERT((unsigned long)scmnd->host_scribble == |
389 | (unsigned long)cmd_request); | |
bef4a34a HJ |
390 | ASSERT(scmnd); |
391 | ASSERT(scmnd->scsi_done); | |
392 | ||
393 | DPRINT_ENTER(STORVSC_DRV); | |
394 | ||
ff568d3a GKH |
395 | if (cmd_request->bounce_sgl_count) { |
396 | /* using bounce buffer */ | |
454f18a9 | 397 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 398 | |
454f18a9 | 399 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
400 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
401 | cmd_request->bounce_sgl, | |
402 | scsi_sg_count(scmnd)); | |
403 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
404 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
405 | } |
406 | ||
407 | scmnd->result = request->Status; | |
408 | ||
ff568d3a GKH |
409 | if (scmnd->result) { |
410 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
411 | request->SenseBufferSize, &sense_hdr)) | |
bef4a34a | 412 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
413 | } |
414 | ||
415 | ASSERT(request->BytesXfer <= request->DataBuffer.Length); | |
bef4a34a | 416 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
417 | |
418 | scsi_done_fn = scmnd->scsi_done; | |
419 | ||
420 | scmnd->host_scribble = NULL; | |
421 | scmnd->scsi_done = NULL; | |
422 | ||
454f18a9 | 423 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
424 | scsi_done_fn(scmnd); |
425 | ||
426 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
427 | ||
428 | DPRINT_EXIT(STORVSC_DRV); | |
429 | } | |
430 | ||
431 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
432 | { | |
ff568d3a | 433 | int i; |
bef4a34a | 434 | |
454f18a9 | 435 | /* No need to check */ |
bef4a34a HJ |
436 | if (sg_count < 2) |
437 | return -1; | |
438 | ||
454f18a9 | 439 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
440 | for (i = 0; i < sg_count; i++) { |
441 | if (i == 0) { | |
442 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
443 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
444 | return i; | |
ff568d3a GKH |
445 | } else if (i == sg_count - 1) { |
446 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
447 | if (sgl[i].offset != 0) |
448 | return i; | |
ff568d3a GKH |
449 | } else { |
450 | /* make sure no hole in the middle */ | |
bef4a34a | 451 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 452 | return i; |
bef4a34a HJ |
453 | } |
454 | } | |
455 | return -1; | |
456 | } | |
457 | ||
ff568d3a GKH |
458 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
459 | unsigned int sg_count, | |
460 | unsigned int len) | |
bef4a34a HJ |
461 | { |
462 | int i; | |
ff568d3a GKH |
463 | int num_pages; |
464 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
465 | struct page *page_buf; |
466 | ||
467 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
468 | ||
06da0bc8 | 469 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 470 | if (!bounce_sgl) |
bef4a34a | 471 | return NULL; |
bef4a34a | 472 | |
ff568d3a | 473 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
474 | page_buf = alloc_page(GFP_ATOMIC); |
475 | if (!page_buf) | |
bef4a34a | 476 | goto cleanup; |
bef4a34a | 477 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
478 | } |
479 | ||
480 | return bounce_sgl; | |
481 | ||
482 | cleanup: | |
483 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
484 | return NULL; | |
485 | } | |
486 | ||
ff568d3a GKH |
487 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
488 | unsigned int sg_count) | |
bef4a34a HJ |
489 | { |
490 | int i; | |
491 | struct page *page_buf; | |
492 | ||
ff568d3a GKH |
493 | for (i = 0; i < sg_count; i++) { |
494 | page_buf = sg_page((&sgl[i])); | |
495 | if (page_buf != NULL) | |
bef4a34a | 496 | __free_page(page_buf); |
bef4a34a HJ |
497 | } |
498 | ||
499 | kfree(sgl); | |
500 | } | |
501 | ||
454f18a9 | 502 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
503 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
504 | struct scatterlist *bounce_sgl, | |
505 | unsigned int orig_sgl_count) | |
bef4a34a | 506 | { |
ff568d3a GKH |
507 | int i; |
508 | int j = 0; | |
bef4a34a HJ |
509 | unsigned long src, dest; |
510 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
511 | unsigned int total_copied = 0; |
512 | unsigned long bounce_addr = 0; | |
513 | unsigned long src_addr = 0; | |
bef4a34a HJ |
514 | unsigned long flags; |
515 | ||
516 | local_irq_save(flags); | |
517 | ||
ff568d3a GKH |
518 | for (i = 0; i < orig_sgl_count; i++) { |
519 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
520 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
521 | src = src_addr; |
522 | srclen = orig_sgl[i].length; | |
523 | ||
bef4a34a HJ |
524 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
525 | ||
526 | if (j == 0) | |
bef4a34a | 527 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 528 | |
ff568d3a | 529 | while (srclen) { |
454f18a9 | 530 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
531 | dest = bounce_addr + bounce_sgl[j].length; |
532 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
533 | ||
fc6a4b26 | 534 | copylen = min(srclen, destlen); |
ff568d3a | 535 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
536 | |
537 | total_copied += copylen; | |
538 | bounce_sgl[j].length += copylen; | |
539 | srclen -= copylen; | |
540 | src += copylen; | |
541 | ||
ff568d3a GKH |
542 | if (bounce_sgl[j].length == PAGE_SIZE) { |
543 | /* full..move to next entry */ | |
544 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
545 | j++; |
546 | ||
454f18a9 | 547 | /* if we need to use another bounce buffer */ |
ff568d3a | 548 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 549 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
550 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
551 | /* unmap the last bounce that is < PAGE_SIZE */ | |
552 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
553 | } |
554 | } | |
555 | ||
ff568d3a | 556 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
557 | } |
558 | ||
559 | local_irq_restore(flags); | |
560 | ||
561 | return total_copied; | |
562 | } | |
563 | ||
454f18a9 | 564 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
565 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
566 | struct scatterlist *bounce_sgl, | |
567 | unsigned int orig_sgl_count) | |
bef4a34a | 568 | { |
ff568d3a GKH |
569 | int i; |
570 | int j = 0; | |
bef4a34a HJ |
571 | unsigned long src, dest; |
572 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
573 | unsigned int total_copied = 0; |
574 | unsigned long bounce_addr = 0; | |
575 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
576 | unsigned long flags; |
577 | ||
578 | local_irq_save(flags); | |
579 | ||
ff568d3a GKH |
580 | for (i = 0; i < orig_sgl_count; i++) { |
581 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
582 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
583 | dest = dest_addr; |
584 | destlen = orig_sgl[i].length; | |
585 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
586 | ||
587 | if (j == 0) | |
bef4a34a | 588 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 589 | |
ff568d3a | 590 | while (destlen) { |
bef4a34a HJ |
591 | src = bounce_addr + bounce_sgl[j].offset; |
592 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
593 | ||
fc6a4b26 | 594 | copylen = min(srclen, destlen); |
ff568d3a | 595 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
596 | |
597 | total_copied += copylen; | |
598 | bounce_sgl[j].offset += copylen; | |
599 | destlen -= copylen; | |
600 | dest += copylen; | |
601 | ||
ff568d3a GKH |
602 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
603 | /* full */ | |
604 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
605 | j++; |
606 | ||
454f18a9 | 607 | /* if we need to use another bounce buffer */ |
ff568d3a | 608 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 609 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
610 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
611 | /* unmap the last bounce that is < PAGE_SIZE */ | |
612 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
613 | } |
614 | } | |
615 | ||
ff568d3a GKH |
616 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
617 | KM_IRQ0); | |
bef4a34a HJ |
618 | } |
619 | ||
620 | local_irq_restore(flags); | |
621 | ||
622 | return total_copied; | |
623 | } | |
624 | ||
ff568d3a GKH |
625 | /** |
626 | * storvsc_queuecommand - Initiate command processing | |
627 | */ | |
628 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, | |
629 | void (*done)(struct scsi_cmnd *)) | |
bef4a34a | 630 | { |
ff568d3a GKH |
631 | int ret; |
632 | struct host_device_context *host_device_ctx = | |
633 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 634 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
ff568d3a GKH |
635 | struct driver_context *driver_ctx = |
636 | driver_to_driver_context(device_ctx->device.driver); | |
637 | struct storvsc_driver_context *storvsc_drv_ctx = | |
638 | (struct storvsc_driver_context *)driver_ctx; | |
639 | struct storvsc_driver_object *storvsc_drv_obj = | |
640 | &storvsc_drv_ctx->drv_obj; | |
0b3f6834 | 641 | struct hv_storvsc_request *request; |
bef4a34a | 642 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 643 | unsigned int request_size = 0; |
bef4a34a HJ |
644 | int i; |
645 | struct scatterlist *sgl; | |
646 | ||
647 | DPRINT_ENTER(STORVSC_DRV); | |
648 | ||
ff568d3a GKH |
649 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
650 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
651 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
652 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
653 | scmnd->device->tagged_supported); | |
bef4a34a | 654 | |
454f18a9 | 655 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 656 | if (scmnd->host_scribble) { |
bef4a34a HJ |
657 | ASSERT(scmnd->scsi_done != NULL); |
658 | ||
ff568d3a GKH |
659 | cmd_request = |
660 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
661 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
662 | scmnd, cmd_request); | |
bef4a34a HJ |
663 | |
664 | goto retry_request; | |
665 | } | |
666 | ||
667 | ASSERT(scmnd->scsi_done == NULL); | |
668 | ASSERT(scmnd->host_scribble == NULL); | |
669 | ||
670 | scmnd->scsi_done = done; | |
671 | ||
672 | request_size = sizeof(struct storvsc_cmd_request); | |
673 | ||
ff568d3a GKH |
674 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, |
675 | GFP_ATOMIC); | |
676 | if (!cmd_request) { | |
677 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
678 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
679 | scmnd->scsi_done = NULL; |
680 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
681 | } | |
682 | ||
454f18a9 | 683 | /* Setup the cmd request */ |
bef4a34a HJ |
684 | cmd_request->bounce_sgl_count = 0; |
685 | cmd_request->bounce_sgl = NULL; | |
686 | cmd_request->cmd = scmnd; | |
687 | ||
ff568d3a | 688 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
689 | |
690 | request = &cmd_request->request; | |
691 | ||
ff568d3a GKH |
692 | request->Extension = |
693 | (void *)((unsigned long)cmd_request + request_size); | |
694 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, | |
695 | storvsc_drv_obj->RequestExtSize); | |
bef4a34a | 696 | |
454f18a9 | 697 | /* Build the SRB */ |
ff568d3a | 698 | switch (scmnd->sc_data_direction) { |
bef4a34a HJ |
699 | case DMA_TO_DEVICE: |
700 | request->Type = WRITE_TYPE; | |
701 | break; | |
702 | case DMA_FROM_DEVICE: | |
703 | request->Type = READ_TYPE; | |
704 | break; | |
705 | default: | |
706 | request->Type = UNKNOWN_TYPE; | |
707 | break; | |
708 | } | |
709 | ||
710 | request->OnIOCompletion = storvsc_commmand_completion; | |
454f18a9 | 711 | request->Context = cmd_request;/* scmnd; */ |
bef4a34a | 712 | |
454f18a9 | 713 | /* request->PortId = scmnd->device->channel; */ |
bef4a34a HJ |
714 | request->Host = host_device_ctx->port; |
715 | request->Bus = scmnd->device->channel; | |
716 | request->TargetId = scmnd->device->id; | |
717 | request->LunId = scmnd->device->lun; | |
718 | ||
719 | ASSERT(scmnd->cmd_len <= 16); | |
720 | request->CdbLen = scmnd->cmd_len; | |
721 | request->Cdb = scmnd->cmnd; | |
722 | ||
723 | request->SenseBuffer = scmnd->sense_buffer; | |
724 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
725 | ||
726 | ||
bef4a34a | 727 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
ff568d3a GKH |
728 | if (scsi_sg_count(scmnd)) { |
729 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
bef4a34a | 730 | |
454f18a9 | 731 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
732 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
733 | DPRINT_INFO(STORVSC_DRV, | |
734 | "need to bounce buffer for this scmnd %p", | |
735 | scmnd); | |
736 | cmd_request->bounce_sgl = | |
737 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
738 | scsi_bufflen(scmnd)); | |
739 | if (!cmd_request->bounce_sgl) { | |
740 | DPRINT_ERR(STORVSC_DRV, | |
741 | "unable to create bounce buffer for " | |
742 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
743 | |
744 | scmnd->scsi_done = NULL; | |
745 | scmnd->host_scribble = NULL; | |
ff568d3a GKH |
746 | kmem_cache_free(host_device_ctx->request_pool, |
747 | cmd_request); | |
bef4a34a HJ |
748 | |
749 | return SCSI_MLQUEUE_HOST_BUSY; | |
750 | } | |
751 | ||
ff568d3a GKH |
752 | cmd_request->bounce_sgl_count = |
753 | ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
754 | PAGE_SHIFT; | |
bef4a34a | 755 | |
ff568d3a GKH |
756 | /* |
757 | * FIXME: We can optimize on reads by just skipping | |
758 | * this | |
759 | */ | |
760 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
761 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
762 | |
763 | sgl = cmd_request->bounce_sgl; | |
764 | } | |
765 | ||
766 | request->DataBuffer.Offset = sgl[0].offset; | |
767 | ||
ff568d3a GKH |
768 | for (i = 0; i < scsi_sg_count(scmnd); i++) { |
769 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", | |
770 | i, sgl[i].length, sgl[i].offset); | |
771 | request->DataBuffer.PfnArray[i] = | |
772 | page_to_pfn(sg_page((&sgl[i]))); | |
bef4a34a | 773 | } |
ff568d3a | 774 | } else if (scsi_sglist(scmnd)) { |
bef4a34a | 775 | ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); |
ff568d3a GKH |
776 | request->DataBuffer.Offset = |
777 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
778 | request->DataBuffer.PfnArray[0] = | |
779 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
780 | } else { | |
bef4a34a HJ |
781 | ASSERT(scsi_bufflen(scmnd) == 0); |
782 | } | |
bef4a34a HJ |
783 | |
784 | retry_request: | |
454f18a9 | 785 | /* Invokes the vsc to start an IO */ |
ff568d3a GKH |
786 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, |
787 | &cmd_request->request); | |
788 | if (ret == -1) { | |
789 | /* no more space */ | |
790 | DPRINT_ERR(STORVSC_DRV, | |
791 | "scmnd (%p) - queue FULL...marking queue busy", | |
792 | scmnd); | |
793 | ||
794 | if (cmd_request->bounce_sgl_count) { | |
795 | /* | |
796 | * FIXME: We can optimize on writes by just skipping | |
797 | * this | |
798 | */ | |
799 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
800 | cmd_request->bounce_sgl, | |
801 | scsi_sg_count(scmnd)); | |
802 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
803 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
804 | } |
805 | ||
806 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
807 | ||
808 | scmnd->scsi_done = NULL; | |
809 | scmnd->host_scribble = NULL; | |
810 | ||
811 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
812 | } | |
813 | ||
814 | DPRINT_EXIT(STORVSC_DRV); | |
815 | ||
816 | return ret; | |
817 | } | |
818 | ||
ff568d3a GKH |
819 | static int storvsc_merge_bvec(struct request_queue *q, |
820 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 821 | { |
ff568d3a GKH |
822 | /* checking done by caller. */ |
823 | return bvec->bv_len; | |
bef4a34a | 824 | } |
bef4a34a | 825 | |
ff568d3a GKH |
826 | /** |
827 | * storvsc_device_configure - Configure the specified scsi device | |
828 | */ | |
bef4a34a HJ |
829 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
830 | { | |
ff568d3a GKH |
831 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
832 | sdevice, BLIST_SPARSELUN); | |
833 | /* | |
834 | * This enables luns to be located sparsely. Otherwise, we may not | |
835 | * discovered them. | |
836 | */ | |
bef4a34a | 837 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
838 | return 0; |
839 | } | |
840 | ||
841 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
842 | { | |
ff568d3a GKH |
843 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
844 | sdevice->queue_depth); | |
bef4a34a | 845 | |
ff568d3a GKH |
846 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
847 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
848 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
849 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 850 | |
ff568d3a GKH |
851 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
852 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
853 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
854 | ||
ff568d3a GKH |
855 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
856 | sdevice); | |
bef4a34a HJ |
857 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
858 | ||
859 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 860 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
861 | |
862 | return 0; | |
863 | } | |
864 | ||
ff568d3a GKH |
865 | /** |
866 | * storvsc_host_reset_handler - Reset the scsi HBA | |
867 | */ | |
bef4a34a HJ |
868 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
869 | { | |
ff568d3a GKH |
870 | int ret; |
871 | struct host_device_context *host_device_ctx = | |
872 | (struct host_device_context *)scmnd->device->host->hostdata; | |
f916a34d | 873 | struct vm_device *device_ctx = host_device_ctx->device_ctx; |
bef4a34a HJ |
874 | |
875 | DPRINT_ENTER(STORVSC_DRV); | |
876 | ||
ff568d3a GKH |
877 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
878 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a | 879 | |
454f18a9 | 880 | /* Invokes the vsc to reset the host/bus */ |
354b0a64 | 881 | ret = StorVscOnHostReset(&device_ctx->device_obj); |
ff568d3a | 882 | if (ret != 0) { |
bef4a34a HJ |
883 | DPRINT_EXIT(STORVSC_DRV); |
884 | return ret; | |
885 | } | |
886 | ||
ff568d3a GKH |
887 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
888 | scmnd->device, &device_ctx->device_obj); | |
bef4a34a HJ |
889 | |
890 | DPRINT_EXIT(STORVSC_DRV); | |
891 | ||
892 | return ret; | |
893 | } | |
894 | ||
ff568d3a GKH |
895 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
896 | sector_t capacity, int *info) | |
bef4a34a HJ |
897 | { |
898 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
899 | sector_t cylinder_times_heads = 0; |
900 | sector_t temp = 0; | |
bef4a34a | 901 | |
ff568d3a GKH |
902 | int sectors_per_track = 0; |
903 | int heads = 0; | |
904 | int cylinders = 0; | |
905 | int rem = 0; | |
bef4a34a | 906 | |
ff568d3a GKH |
907 | if (total_sectors > (65535 * 16 * 255)) |
908 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 909 | |
ff568d3a GKH |
910 | if (total_sectors >= (65535 * 16 * 63)) { |
911 | sectors_per_track = 255; | |
912 | heads = 16; | |
bef4a34a HJ |
913 | |
914 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
915 | /* sector_div stores the quotient in cylinder_times_heads */ |
916 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
917 | } else { | |
918 | sectors_per_track = 17; | |
bef4a34a HJ |
919 | |
920 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
921 | /* sector_div stores the quotient in cylinder_times_heads */ |
922 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
923 | |
924 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
925 | /* sector_div stores the quotient in temp */ |
926 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
927 | |
928 | heads = temp; | |
929 | ||
ff568d3a GKH |
930 | if (heads < 4) |
931 | heads = 4; | |
bef4a34a | 932 | |
ff568d3a GKH |
933 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
934 | sectors_per_track = 31; | |
935 | heads = 16; | |
bef4a34a HJ |
936 | |
937 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
938 | /* |
939 | * sector_div stores the quotient in | |
940 | * cylinder_times_heads | |
941 | */ | |
942 | rem = sector_div(cylinder_times_heads, | |
943 | sectors_per_track); | |
944 | } | |
bef4a34a | 945 | |
ff568d3a GKH |
946 | if (cylinder_times_heads >= (heads * 1024)) { |
947 | sectors_per_track = 63; | |
948 | heads = 16; | |
bef4a34a HJ |
949 | |
950 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
951 | /* |
952 | * sector_div stores the quotient in | |
953 | * cylinder_times_heads | |
954 | */ | |
955 | rem = sector_div(cylinder_times_heads, | |
956 | sectors_per_track); | |
957 | } | |
958 | } | |
bef4a34a HJ |
959 | |
960 | temp = cylinder_times_heads; | |
ff568d3a GKH |
961 | /* sector_div stores the quotient in temp */ |
962 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
963 | cylinders = temp; |
964 | ||
965 | info[0] = heads; | |
ff568d3a GKH |
966 | info[1] = sectors_per_track; |
967 | info[2] = cylinders; | |
bef4a34a | 968 | |
ff568d3a GKH |
969 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
970 | sectors_per_track); | |
bef4a34a HJ |
971 | |
972 | return 0; | |
973 | } | |
974 | ||
bef4a34a HJ |
975 | static int __init storvsc_init(void) |
976 | { | |
977 | int ret; | |
978 | ||
979 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 980 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
bef4a34a | 981 | ret = storvsc_drv_init(StorVscInitialize); |
bef4a34a | 982 | DPRINT_EXIT(STORVSC_DRV); |
bef4a34a HJ |
983 | return ret; |
984 | } | |
985 | ||
986 | static void __exit storvsc_exit(void) | |
987 | { | |
988 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a | 989 | storvsc_drv_exit(); |
bef4a34a HJ |
990 | DPRINT_ENTER(STORVSC_DRV); |
991 | } | |
992 | ||
ff568d3a | 993 | MODULE_LICENSE("GPL"); |
26c14cc1 | 994 | MODULE_VERSION(HV_DRV_VERSION); |
bef4a34a | 995 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
bef4a34a HJ |
996 | module_init(storvsc_init); |
997 | module_exit(storvsc_exit); |