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