]>
Commit | Line | Data |
---|---|---|
f82bd046 | 1 | /* |
f82bd046 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: | |
d0e94d17 | 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
f82bd046 | 19 | * Hank Janssen <hjanssen@microsoft.com> |
f82bd046 | 20 | */ |
f82bd046 HJ |
21 | #include <linux/init.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/hdreg.h> | |
f82bd046 HJ |
28 | #include <scsi/scsi.h> |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_eh.h> | |
31 | #include <scsi/scsi_dbg.h> | |
4983b39a | 32 | #include "osd.h" |
645954c5 | 33 | #include "logging.h" |
870cde80 | 34 | #include "vmbus.h" |
731a7884 | 35 | #include "StorVscApi.h" |
f82bd046 | 36 | |
454f18a9 | 37 | |
f82bd046 HJ |
38 | #define BLKVSC_MINORS 64 |
39 | ||
f82bd046 HJ |
40 | enum blkvsc_device_type { |
41 | UNKNOWN_DEV_TYPE, | |
42 | HARDDISK_TYPE, | |
43 | DVD_TYPE, | |
44 | }; | |
45 | ||
454f18a9 BP |
46 | /* |
47 | * This request ties the struct request and struct | |
0b3f6834 | 48 | * blkvsc_request/hv_storvsc_request together A struct request may be |
454f18a9 BP |
49 | * represented by 1 or more struct blkvsc_request |
50 | */ | |
f82bd046 | 51 | struct blkvsc_request_group { |
8a280399 GKH |
52 | int outstanding; |
53 | int status; | |
54 | struct list_head blkvsc_req_list; /* list of blkvsc_requests */ | |
f82bd046 HJ |
55 | }; |
56 | ||
f82bd046 | 57 | struct blkvsc_request { |
8a280399 GKH |
58 | /* blkvsc_request_group.blkvsc_req_list */ |
59 | struct list_head req_entry; | |
60 | ||
61 | /* block_device_context.pending_list */ | |
62 | struct list_head pend_entry; | |
63 | ||
64 | /* This may be null if we generate a request internally */ | |
65 | struct request *req; | |
f82bd046 | 66 | |
8a280399 | 67 | struct block_device_context *dev; |
f82bd046 | 68 | |
8a280399 GKH |
69 | /* The group this request is part of. Maybe null */ |
70 | struct blkvsc_request_group *group; | |
f82bd046 | 71 | |
8a280399 | 72 | wait_queue_head_t wevent; |
f82bd046 HJ |
73 | int cond; |
74 | ||
8a280399 GKH |
75 | int write; |
76 | sector_t sector_start; | |
77 | unsigned long sector_count; | |
f82bd046 HJ |
78 | |
79 | unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; | |
80 | unsigned char cmd_len; | |
81 | unsigned char cmnd[MAX_COMMAND_SIZE]; | |
82 | ||
0b3f6834 | 83 | struct hv_storvsc_request request; |
8a280399 GKH |
84 | /* |
85 | * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap, | |
86 | * because - The extension buffer falls right here and is pointed to by | |
87 | * request.Extension; | |
88 | * Which sounds like a horrible idea, who designed this? | |
89 | */ | |
f82bd046 HJ |
90 | }; |
91 | ||
454f18a9 | 92 | /* Per device structure */ |
f82bd046 | 93 | struct block_device_context { |
8a280399 GKH |
94 | /* point back to our device context */ |
95 | struct device_context *device_ctx; | |
96 | struct kmem_cache *request_pool; | |
97 | spinlock_t lock; | |
98 | struct gendisk *gd; | |
f82bd046 | 99 | enum blkvsc_device_type device_type; |
8a280399 GKH |
100 | struct list_head pending_list; |
101 | ||
102 | unsigned char device_id[64]; | |
103 | unsigned int device_id_len; | |
104 | int num_outstanding_reqs; | |
105 | int shutting_down; | |
106 | int media_not_present; | |
107 | unsigned int sector_size; | |
108 | sector_t capacity; | |
109 | unsigned int port; | |
110 | unsigned char path; | |
111 | unsigned char target; | |
112 | int users; | |
f82bd046 HJ |
113 | }; |
114 | ||
454f18a9 | 115 | /* Per driver */ |
f82bd046 | 116 | struct blkvsc_driver_context { |
454f18a9 | 117 | /* !! These must be the first 2 fields !! */ |
8a280399 GKH |
118 | /* FIXME this is a bug! */ |
119 | struct driver_context drv_ctx; | |
9f0c7d2c | 120 | struct storvsc_driver_object drv_obj; |
f82bd046 HJ |
121 | }; |
122 | ||
454f18a9 | 123 | /* Static decl */ |
f82bd046 HJ |
124 | static int blkvsc_probe(struct device *dev); |
125 | static int blkvsc_remove(struct device *device); | |
126 | static void blkvsc_shutdown(struct device *device); | |
127 | ||
39635f7d | 128 | static int blkvsc_open(struct block_device *bdev, fmode_t mode); |
77d2d9da | 129 | static int blkvsc_release(struct gendisk *disk, fmode_t mode); |
f82bd046 HJ |
130 | static int blkvsc_media_changed(struct gendisk *gd); |
131 | static int blkvsc_revalidate_disk(struct gendisk *gd); | |
132 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg); | |
dfe8b2d9 BP |
133 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
134 | unsigned cmd, unsigned long argument); | |
f82bd046 | 135 | static void blkvsc_request(struct request_queue *queue); |
0b3f6834 | 136 | static void blkvsc_request_completion(struct hv_storvsc_request *request); |
8a280399 GKH |
137 | static int blkvsc_do_request(struct block_device_context *blkdev, |
138 | struct request *req); | |
139 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, | |
140 | void (*request_completion)(struct hv_storvsc_request *)); | |
f82bd046 | 141 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); |
0b3f6834 | 142 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request); |
f82bd046 HJ |
143 | static int blkvsc_do_inquiry(struct block_device_context *blkdev); |
144 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev); | |
145 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev); | |
146 | static int blkvsc_do_flush(struct block_device_context *blkdev); | |
147 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev); | |
148 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev); | |
149 | ||
150 | ||
151 | static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; | |
152 | ||
454f18a9 | 153 | /* The one and only one */ |
f82bd046 HJ |
154 | static struct blkvsc_driver_context g_blkvsc_drv; |
155 | ||
8a280399 | 156 | static struct block_device_operations block_ops = { |
f82bd046 HJ |
157 | .owner = THIS_MODULE, |
158 | .open = blkvsc_open, | |
159 | .release = blkvsc_release, | |
160 | .media_changed = blkvsc_media_changed, | |
161 | .revalidate_disk = blkvsc_revalidate_disk, | |
162 | .getgeo = blkvsc_getgeo, | |
163 | .ioctl = blkvsc_ioctl, | |
164 | }; | |
165 | ||
8a280399 GKH |
166 | /** |
167 | * blkvsc_drv_init - BlkVsc driver initialization. | |
168 | */ | |
21707bed | 169 | static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
f82bd046 | 170 | { |
9f0c7d2c | 171 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
172 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
173 | int ret; | |
f82bd046 HJ |
174 | |
175 | DPRINT_ENTER(BLKVSC_DRV); | |
176 | ||
177 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
178 | ||
179 | storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size; | |
180 | ||
454f18a9 | 181 | /* Callback to client driver to complete the initialization */ |
21707bed | 182 | drv_init(&storvsc_drv_obj->Base); |
f82bd046 HJ |
183 | |
184 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
8a280399 GKH |
185 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
186 | sizeof(struct hv_guid)); | |
f82bd046 | 187 | |
f82bd046 HJ |
188 | drv_ctx->probe = blkvsc_probe; |
189 | drv_ctx->remove = blkvsc_remove; | |
190 | drv_ctx->shutdown = blkvsc_shutdown; | |
f82bd046 | 191 | |
454f18a9 | 192 | /* The driver belongs to vmbus */ |
5d48a1c2 | 193 | ret = vmbus_child_driver_register(drv_ctx); |
f82bd046 HJ |
194 | |
195 | DPRINT_EXIT(BLKVSC_DRV); | |
196 | ||
197 | return ret; | |
198 | } | |
199 | ||
f82bd046 HJ |
200 | static int blkvsc_drv_exit_cb(struct device *dev, void *data) |
201 | { | |
202 | struct device **curr = (struct device **)data; | |
203 | *curr = dev; | |
454f18a9 | 204 | return 1; /* stop iterating */ |
f82bd046 HJ |
205 | } |
206 | ||
bd1de709 | 207 | static void blkvsc_drv_exit(void) |
f82bd046 | 208 | { |
9f0c7d2c | 209 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
210 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
211 | struct device *current_dev; | |
2295ba2e | 212 | int ret; |
f82bd046 | 213 | |
f82bd046 HJ |
214 | DPRINT_ENTER(BLKVSC_DRV); |
215 | ||
8a280399 | 216 | while (1) { |
f82bd046 HJ |
217 | current_dev = NULL; |
218 | ||
454f18a9 | 219 | /* Get the device */ |
2295ba2e BP |
220 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
221 | (void *) ¤t_dev, | |
222 | blkvsc_drv_exit_cb); | |
223 | ||
224 | if (ret) | |
225 | DPRINT_WARN(BLKVSC_DRV, | |
226 | "driver_for_each_device returned %d", ret); | |
227 | ||
f82bd046 HJ |
228 | |
229 | if (current_dev == NULL) | |
230 | break; | |
231 | ||
454f18a9 | 232 | /* Initiate removal from the top-down */ |
f82bd046 HJ |
233 | device_unregister(current_dev); |
234 | } | |
235 | ||
236 | if (storvsc_drv_obj->Base.OnCleanup) | |
237 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
238 | ||
239 | vmbus_child_driver_unregister(drv_ctx); | |
240 | ||
241 | DPRINT_EXIT(BLKVSC_DRV); | |
242 | ||
243 | return; | |
244 | } | |
245 | ||
8a280399 GKH |
246 | /** |
247 | * blkvsc_probe - Add a new device for this driver | |
248 | */ | |
f82bd046 HJ |
249 | static int blkvsc_probe(struct device *device) |
250 | { | |
8a280399 GKH |
251 | struct driver_context *driver_ctx = |
252 | driver_to_driver_context(device->driver); | |
253 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
254 | (struct blkvsc_driver_context *)driver_ctx; | |
255 | struct storvsc_driver_object *storvsc_drv_obj = | |
256 | &blkvsc_drv_ctx->drv_obj; | |
f82bd046 | 257 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 258 | struct hv_device *device_obj = &device_ctx->device_obj; |
f82bd046 | 259 | |
8a280399 | 260 | struct block_device_context *blkdev = NULL; |
9f0c7d2c | 261 | struct storvsc_device_info device_info; |
8a280399 GKH |
262 | int major = 0; |
263 | int devnum = 0; | |
264 | int ret = 0; | |
265 | static int ide0_registered; | |
266 | static int ide1_registered; | |
f82bd046 HJ |
267 | |
268 | DPRINT_ENTER(BLKVSC_DRV); | |
269 | ||
270 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter"); | |
271 | ||
8a280399 | 272 | if (!storvsc_drv_obj->Base.OnDeviceAdd) { |
f82bd046 | 273 | DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set"); |
f82bd046 HJ |
274 | ret = -1; |
275 | goto Cleanup; | |
276 | } | |
277 | ||
278 | blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); | |
8a280399 | 279 | if (!blkdev) { |
f82bd046 HJ |
280 | ret = -ENOMEM; |
281 | goto Cleanup; | |
282 | } | |
283 | ||
284 | INIT_LIST_HEAD(&blkdev->pending_list); | |
285 | ||
454f18a9 | 286 | /* Initialize what we can here */ |
f82bd046 HJ |
287 | spin_lock_init(&blkdev->lock); |
288 | ||
8a280399 GKH |
289 | ASSERT(sizeof(struct blkvsc_request_group) <= |
290 | sizeof(struct blkvsc_request)); | |
f82bd046 | 291 | |
454f18a9 | 292 | blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device), |
8a280399 GKH |
293 | sizeof(struct blkvsc_request) + |
294 | storvsc_drv_obj->RequestExtSize, 0, | |
295 | SLAB_HWCACHE_ALIGN, NULL); | |
296 | if (!blkdev->request_pool) { | |
f82bd046 HJ |
297 | ret = -ENOMEM; |
298 | goto Cleanup; | |
299 | } | |
300 | ||
301 | ||
454f18a9 | 302 | /* Call to the vsc driver to add the device */ |
f82bd046 | 303 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info); |
8a280399 | 304 | if (ret != 0) { |
f82bd046 HJ |
305 | DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device"); |
306 | goto Cleanup; | |
307 | } | |
308 | ||
309 | blkdev->device_ctx = device_ctx; | |
8a280399 GKH |
310 | /* this identified the device 0 or 1 */ |
311 | blkdev->target = device_info.TargetId; | |
312 | /* this identified the ide ctrl 0 or 1 */ | |
313 | blkdev->path = device_info.PathId; | |
f82bd046 | 314 | |
b57a68dc | 315 | dev_set_drvdata(device, blkdev); |
f82bd046 | 316 | |
454f18a9 | 317 | /* Calculate the major and device num */ |
8a280399 | 318 | if (blkdev->path == 0) { |
f82bd046 | 319 | major = IDE0_MAJOR; |
454f18a9 | 320 | devnum = blkdev->path + blkdev->target; /* 0 or 1 */ |
f82bd046 | 321 | |
8a280399 | 322 | if (!ide0_registered) { |
f82bd046 | 323 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
324 | if (ret != 0) { |
325 | DPRINT_ERR(BLKVSC_DRV, | |
326 | "register_blkdev() failed! ret %d", | |
327 | ret); | |
f82bd046 HJ |
328 | goto Remove; |
329 | } | |
330 | ||
331 | ide0_registered = 1; | |
332 | } | |
8a280399 | 333 | } else if (blkdev->path == 1) { |
f82bd046 | 334 | major = IDE1_MAJOR; |
454f18a9 | 335 | devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */ |
f82bd046 | 336 | |
8a280399 | 337 | if (!ide1_registered) { |
f82bd046 | 338 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
339 | if (ret != 0) { |
340 | DPRINT_ERR(BLKVSC_DRV, | |
341 | "register_blkdev() failed! ret %d", | |
342 | ret); | |
f82bd046 HJ |
343 | goto Remove; |
344 | } | |
345 | ||
346 | ide1_registered = 1; | |
347 | } | |
8a280399 | 348 | } else { |
f82bd046 HJ |
349 | DPRINT_ERR(BLKVSC_DRV, "invalid pathid"); |
350 | ret = -1; | |
351 | goto Cleanup; | |
352 | } | |
353 | ||
354 | DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major); | |
355 | ||
356 | blkdev->gd = alloc_disk(BLKVSC_MINORS); | |
8a280399 | 357 | if (!blkdev->gd) { |
f82bd046 HJ |
358 | DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); |
359 | ret = -1; | |
360 | goto Cleanup; | |
361 | } | |
362 | ||
363 | blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); | |
364 | ||
365 | blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); | |
8a78362c | 366 | blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); |
f82bd046 HJ |
367 | blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); |
368 | blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); | |
369 | blk_queue_dma_alignment(blkdev->gd->queue, 511); | |
370 | ||
371 | blkdev->gd->major = major; | |
372 | if (devnum == 1 || devnum == 3) | |
373 | blkdev->gd->first_minor = BLKVSC_MINORS; | |
374 | else | |
375 | blkdev->gd->first_minor = 0; | |
376 | blkdev->gd->fops = &block_ops; | |
377 | blkdev->gd->private_data = blkdev; | |
8a280399 | 378 | sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum); |
f82bd046 HJ |
379 | |
380 | blkvsc_do_inquiry(blkdev); | |
8a280399 | 381 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 HJ |
382 | set_disk_ro(blkdev->gd, 1); |
383 | blkdev->gd->flags |= GENHD_FL_REMOVABLE; | |
384 | blkvsc_do_read_capacity(blkdev); | |
8a280399 | 385 | } else { |
f82bd046 HJ |
386 | blkvsc_do_read_capacity16(blkdev); |
387 | } | |
388 | ||
389 | set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
0fce4c2f | 390 | blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); |
454f18a9 | 391 | /* go! */ |
f82bd046 HJ |
392 | add_disk(blkdev->gd); |
393 | ||
8a280399 GKH |
394 | DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", |
395 | blkdev->gd->disk_name, (unsigned long)blkdev->capacity, | |
396 | blkdev->sector_size); | |
f82bd046 HJ |
397 | |
398 | return ret; | |
399 | ||
400 | Remove: | |
401 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
402 | ||
403 | Cleanup: | |
8a280399 GKH |
404 | if (blkdev) { |
405 | if (blkdev->request_pool) { | |
f82bd046 HJ |
406 | kmem_cache_destroy(blkdev->request_pool); |
407 | blkdev->request_pool = NULL; | |
408 | } | |
409 | kfree(blkdev); | |
410 | blkdev = NULL; | |
411 | } | |
412 | ||
413 | DPRINT_EXIT(BLKVSC_DRV); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
418 | static void blkvsc_shutdown(struct device *device) | |
419 | { | |
b57a68dc | 420 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 HJ |
421 | unsigned long flags; |
422 | ||
423 | if (!blkdev) | |
424 | return; | |
425 | ||
8a280399 GKH |
426 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n", |
427 | blkdev->users, blkdev->gd->disk_name); | |
f82bd046 HJ |
428 | |
429 | spin_lock_irqsave(&blkdev->lock, flags); | |
430 | ||
431 | blkdev->shutting_down = 1; | |
432 | ||
433 | blk_stop_queue(blkdev->gd->queue); | |
434 | ||
435 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
436 | ||
8a280399 GKH |
437 | while (blkdev->num_outstanding_reqs) { |
438 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
439 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
440 | udelay(100); |
441 | } | |
442 | ||
443 | blkvsc_do_flush(blkdev); | |
444 | ||
445 | spin_lock_irqsave(&blkdev->lock, flags); | |
446 | ||
447 | blkvsc_cancel_pending_reqs(blkdev); | |
448 | ||
449 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
450 | } | |
451 | ||
452 | static int blkvsc_do_flush(struct block_device_context *blkdev) | |
453 | { | |
8a280399 | 454 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
455 | |
456 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n"); | |
457 | ||
458 | if (blkdev->device_type != HARDDISK_TYPE) | |
459 | return 0; | |
460 | ||
461 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
462 | if (!blkvsc_req) | |
f82bd046 | 463 | return -ENOMEM; |
f82bd046 HJ |
464 | |
465 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
466 | init_waitqueue_head(&blkvsc_req->wevent); | |
467 | blkvsc_req->dev = blkdev; | |
468 | blkvsc_req->req = NULL; | |
469 | blkvsc_req->write = 0; | |
470 | ||
471 | blkvsc_req->request.DataBuffer.PfnArray[0] = 0; | |
472 | blkvsc_req->request.DataBuffer.Offset = 0; | |
473 | blkvsc_req->request.DataBuffer.Length = 0; | |
474 | ||
475 | blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; | |
476 | blkvsc_req->cmd_len = 10; | |
477 | ||
8a280399 GKH |
478 | /* |
479 | * Set this here since the completion routine may be invoked and | |
480 | * completed before we return | |
481 | */ | |
482 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
483 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); |
484 | ||
485 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
486 | ||
487 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
454f18a9 | 492 | /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */ |
f82bd046 HJ |
493 | static int blkvsc_do_inquiry(struct block_device_context *blkdev) |
494 | { | |
8a280399 | 495 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
496 | struct page *page_buf; |
497 | unsigned char *buf; | |
498 | unsigned char device_type; | |
499 | ||
500 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n"); | |
501 | ||
502 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
503 | if (!blkvsc_req) | |
f82bd046 | 504 | return -ENOMEM; |
f82bd046 HJ |
505 | |
506 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
507 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 508 | if (!page_buf) { |
f82bd046 HJ |
509 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
510 | return -ENOMEM; | |
511 | } | |
512 | ||
513 | init_waitqueue_head(&blkvsc_req->wevent); | |
514 | blkvsc_req->dev = blkdev; | |
515 | blkvsc_req->req = NULL; | |
516 | blkvsc_req->write = 0; | |
517 | ||
518 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
519 | blkvsc_req->request.DataBuffer.Offset = 0; | |
520 | blkvsc_req->request.DataBuffer.Length = 64; | |
521 | ||
522 | blkvsc_req->cmnd[0] = INQUIRY; | |
454f18a9 BP |
523 | blkvsc_req->cmnd[1] = 0x1; /* Get product data */ |
524 | blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ | |
f82bd046 HJ |
525 | blkvsc_req->cmnd[4] = 64; |
526 | blkvsc_req->cmd_len = 6; | |
527 | ||
8a280399 GKH |
528 | /* |
529 | * Set this here since the completion routine may be invoked and | |
530 | * completed before we return | |
531 | */ | |
532 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
533 | |
534 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
535 | ||
8a280399 GKH |
536 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
537 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
538 | |
539 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
540 | ||
541 | buf = kmap(page_buf); | |
542 | ||
04f50c4d | 543 | /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */ |
454f18a9 | 544 | /* be to le */ |
f82bd046 HJ |
545 | device_type = buf[0] & 0x1F; |
546 | ||
8a280399 | 547 | if (device_type == 0x0) { |
f82bd046 | 548 | blkdev->device_type = HARDDISK_TYPE; |
8a280399 | 549 | } else if (device_type == 0x5) { |
f82bd046 | 550 | blkdev->device_type = DVD_TYPE; |
8a280399 | 551 | } else { |
454f18a9 | 552 | /* TODO: this is currently unsupported device type */ |
f82bd046 HJ |
553 | blkdev->device_type = UNKNOWN_DEV_TYPE; |
554 | } | |
555 | ||
556 | DPRINT_DBG(BLKVSC_DRV, "device type %d \n", device_type); | |
557 | ||
558 | blkdev->device_id_len = buf[7]; | |
559 | if (blkdev->device_id_len > 64) | |
560 | blkdev->device_id_len = 64; | |
561 | ||
562 | memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); | |
04f50c4d | 563 | /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id, |
454f18a9 | 564 | * blkdev->device_id_len); */ |
f82bd046 HJ |
565 | |
566 | kunmap(page_buf); | |
567 | ||
568 | __free_page(page_buf); | |
569 | ||
570 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
454f18a9 | 575 | /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */ |
f82bd046 HJ |
576 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev) |
577 | { | |
8a280399 | 578 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
579 | struct page *page_buf; |
580 | unsigned char *buf; | |
581 | struct scsi_sense_hdr sense_hdr; | |
582 | ||
583 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n"); | |
584 | ||
585 | blkdev->sector_size = 0; | |
586 | blkdev->capacity = 0; | |
454f18a9 | 587 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
588 | |
589 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
590 | if (!blkvsc_req) | |
f82bd046 | 591 | return -ENOMEM; |
f82bd046 HJ |
592 | |
593 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
594 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 595 | if (!page_buf) { |
f82bd046 HJ |
596 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
597 | return -ENOMEM; | |
598 | } | |
599 | ||
600 | init_waitqueue_head(&blkvsc_req->wevent); | |
601 | blkvsc_req->dev = blkdev; | |
602 | blkvsc_req->req = NULL; | |
603 | blkvsc_req->write = 0; | |
604 | ||
605 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
606 | blkvsc_req->request.DataBuffer.Offset = 0; | |
607 | blkvsc_req->request.DataBuffer.Length = 8; | |
608 | ||
609 | blkvsc_req->cmnd[0] = READ_CAPACITY; | |
610 | blkvsc_req->cmd_len = 16; | |
611 | ||
454f18a9 BP |
612 | /* |
613 | * Set this here since the completion routine may be invoked | |
614 | * and completed before we return | |
615 | */ | |
8a280399 | 616 | blkvsc_req->cond = 0; |
f82bd046 HJ |
617 | |
618 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
619 | ||
8a280399 GKH |
620 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
621 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
622 | |
623 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
624 | ||
454f18a9 | 625 | /* check error */ |
8a280399 GKH |
626 | if (blkvsc_req->request.Status) { |
627 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
628 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
f82bd046 | 629 | |
8a280399 GKH |
630 | if (sense_hdr.asc == 0x3A) { |
631 | /* Medium not present */ | |
f82bd046 HJ |
632 | blkdev->media_not_present = 1; |
633 | } | |
f82bd046 HJ |
634 | return 0; |
635 | } | |
636 | buf = kmap(page_buf); | |
637 | ||
454f18a9 | 638 | /* be to le */ |
8a280399 GKH |
639 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | |
640 | (buf[2] << 8) | buf[3]) + 1; | |
641 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
642 | (buf[6] << 8) | buf[7]; | |
f82bd046 HJ |
643 | |
644 | kunmap(page_buf); | |
645 | ||
646 | __free_page(page_buf); | |
647 | ||
648 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
f82bd046 HJ |
653 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev) |
654 | { | |
8a280399 | 655 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
656 | struct page *page_buf; |
657 | unsigned char *buf; | |
658 | struct scsi_sense_hdr sense_hdr; | |
659 | ||
660 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n"); | |
661 | ||
662 | blkdev->sector_size = 0; | |
663 | blkdev->capacity = 0; | |
454f18a9 | 664 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
665 | |
666 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
667 | if (!blkvsc_req) | |
f82bd046 | 668 | return -ENOMEM; |
f82bd046 HJ |
669 | |
670 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
671 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 672 | if (!page_buf) { |
f82bd046 HJ |
673 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
674 | return -ENOMEM; | |
675 | } | |
676 | ||
677 | init_waitqueue_head(&blkvsc_req->wevent); | |
678 | blkvsc_req->dev = blkdev; | |
679 | blkvsc_req->req = NULL; | |
680 | blkvsc_req->write = 0; | |
681 | ||
682 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
683 | blkvsc_req->request.DataBuffer.Offset = 0; | |
684 | blkvsc_req->request.DataBuffer.Length = 12; | |
685 | ||
454f18a9 | 686 | blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */ |
f82bd046 HJ |
687 | blkvsc_req->cmd_len = 16; |
688 | ||
454f18a9 BP |
689 | /* |
690 | * Set this here since the completion routine may be invoked | |
691 | * and completed before we return | |
692 | */ | |
8a280399 | 693 | blkvsc_req->cond = 0; |
f82bd046 HJ |
694 | |
695 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
696 | ||
8a280399 GKH |
697 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
698 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
699 | |
700 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
701 | ||
454f18a9 | 702 | /* check error */ |
8a280399 GKH |
703 | if (blkvsc_req->request.Status) { |
704 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
705 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
706 | if (sense_hdr.asc == 0x3A) { | |
707 | /* Medium not present */ | |
f82bd046 HJ |
708 | blkdev->media_not_present = 1; |
709 | } | |
f82bd046 HJ |
710 | return 0; |
711 | } | |
712 | buf = kmap(page_buf); | |
713 | ||
454f18a9 | 714 | /* be to le */ |
8a280399 GKH |
715 | blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1; |
716 | blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]); | |
f82bd046 | 717 | |
8a280399 GKH |
718 | #if 0 |
719 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | | |
720 | (buf[2] << 8) | buf[3]) + 1; | |
721 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
722 | (buf[6] << 8) | buf[7]; | |
723 | #endif | |
f82bd046 HJ |
724 | |
725 | kunmap(page_buf); | |
726 | ||
727 | __free_page(page_buf); | |
728 | ||
729 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
8a280399 GKH |
734 | /** |
735 | * blkvsc_remove() - Callback when our device is removed | |
736 | */ | |
f82bd046 HJ |
737 | static int blkvsc_remove(struct device *device) |
738 | { | |
8a280399 GKH |
739 | struct driver_context *driver_ctx = |
740 | driver_to_driver_context(device->driver); | |
741 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
742 | (struct blkvsc_driver_context *)driver_ctx; | |
743 | struct storvsc_driver_object *storvsc_drv_obj = | |
744 | &blkvsc_drv_ctx->drv_obj; | |
f82bd046 | 745 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 746 | struct hv_device *device_obj = &device_ctx->device_obj; |
b57a68dc | 747 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 | 748 | unsigned long flags; |
8a280399 | 749 | int ret; |
f82bd046 HJ |
750 | |
751 | DPRINT_ENTER(BLKVSC_DRV); | |
752 | ||
753 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n"); | |
754 | ||
8a280399 | 755 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
f82bd046 HJ |
756 | DPRINT_EXIT(BLKVSC_DRV); |
757 | return -1; | |
758 | } | |
759 | ||
8a280399 GKH |
760 | /* |
761 | * Call to the vsc driver to let it know that the device is being | |
762 | * removed | |
763 | */ | |
f82bd046 | 764 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
8a280399 | 765 | if (ret != 0) { |
454f18a9 | 766 | /* TODO: */ |
8a280399 GKH |
767 | DPRINT_ERR(BLKVSC_DRV, |
768 | "unable to remove blkvsc device (ret %d)", ret); | |
f82bd046 HJ |
769 | } |
770 | ||
454f18a9 | 771 | /* Get to a known state */ |
f82bd046 HJ |
772 | spin_lock_irqsave(&blkdev->lock, flags); |
773 | ||
774 | blkdev->shutting_down = 1; | |
775 | ||
776 | blk_stop_queue(blkdev->gd->queue); | |
777 | ||
778 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
779 | ||
8a280399 GKH |
780 | while (blkdev->num_outstanding_reqs) { |
781 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
782 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
783 | udelay(100); |
784 | } | |
785 | ||
786 | blkvsc_do_flush(blkdev); | |
787 | ||
788 | spin_lock_irqsave(&blkdev->lock, flags); | |
789 | ||
790 | blkvsc_cancel_pending_reqs(blkdev); | |
791 | ||
792 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
793 | ||
794 | blk_cleanup_queue(blkdev->gd->queue); | |
795 | ||
796 | del_gendisk(blkdev->gd); | |
797 | ||
798 | kmem_cache_destroy(blkdev->request_pool); | |
799 | ||
800 | kfree(blkdev); | |
801 | ||
802 | DPRINT_EXIT(BLKVSC_DRV); | |
803 | ||
804 | return ret; | |
805 | } | |
806 | ||
807 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) | |
808 | { | |
809 | ASSERT(blkvsc_req->req); | |
810 | ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); | |
811 | ||
812 | blkvsc_req->cmd_len = 16; | |
813 | ||
8a280399 GKH |
814 | if (blkvsc_req->sector_start > 0xffffffff) { |
815 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
816 | blkvsc_req->write = 1; |
817 | blkvsc_req->cmnd[0] = WRITE_16; | |
8a280399 | 818 | } else { |
f82bd046 HJ |
819 | blkvsc_req->write = 0; |
820 | blkvsc_req->cmnd[0] = READ_16; | |
821 | } | |
822 | ||
823 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
824 | ||
8a280399 GKH |
825 | *(unsigned long long *)&blkvsc_req->cmnd[2] = |
826 | cpu_to_be64(blkvsc_req->sector_start); | |
827 | *(unsigned int *)&blkvsc_req->cmnd[10] = | |
828 | cpu_to_be32(blkvsc_req->sector_count); | |
829 | } else if ((blkvsc_req->sector_count > 0xff) || | |
830 | (blkvsc_req->sector_start > 0x1fffff)) { | |
831 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
832 | blkvsc_req->write = 1; |
833 | blkvsc_req->cmnd[0] = WRITE_10; | |
8a280399 | 834 | } else { |
f82bd046 HJ |
835 | blkvsc_req->write = 0; |
836 | blkvsc_req->cmnd[0] = READ_10; | |
837 | } | |
838 | ||
839 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
840 | ||
8a280399 GKH |
841 | *(unsigned int *)&blkvsc_req->cmnd[2] = |
842 | cpu_to_be32(blkvsc_req->sector_start); | |
843 | *(unsigned short *)&blkvsc_req->cmnd[7] = | |
844 | cpu_to_be16(blkvsc_req->sector_count); | |
845 | } else { | |
846 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
847 | blkvsc_req->write = 1; |
848 | blkvsc_req->cmnd[0] = WRITE_6; | |
8a280399 | 849 | } else { |
f82bd046 HJ |
850 | blkvsc_req->write = 0; |
851 | blkvsc_req->cmnd[0] = READ_6; | |
852 | } | |
853 | ||
8a280399 GKH |
854 | *(unsigned int *)&blkvsc_req->cmnd[1] = |
855 | cpu_to_be32(blkvsc_req->sector_start) >> 8; | |
f82bd046 | 856 | blkvsc_req->cmnd[1] &= 0x1f; |
8a280399 | 857 | blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count; |
f82bd046 HJ |
858 | } |
859 | } | |
860 | ||
8a280399 GKH |
861 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, |
862 | void (*request_completion)(struct hv_storvsc_request *)) | |
f82bd046 HJ |
863 | { |
864 | struct block_device_context *blkdev = blkvsc_req->dev; | |
8a280399 GKH |
865 | struct device_context *device_ctx = blkdev->device_ctx; |
866 | struct driver_context *driver_ctx = | |
867 | driver_to_driver_context(device_ctx->device.driver); | |
868 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
869 | (struct blkvsc_driver_context *)driver_ctx; | |
870 | struct storvsc_driver_object *storvsc_drv_obj = | |
871 | &blkvsc_drv_ctx->drv_obj; | |
0b3f6834 | 872 | struct hv_storvsc_request *storvsc_req; |
8a280399 | 873 | int ret; |
f82bd046 | 874 | |
8a280399 GKH |
875 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " |
876 | "req %p type %s start_sector %lu count %ld offset %d " | |
877 | "len %d\n", blkvsc_req, | |
878 | (blkvsc_req->write) ? "WRITE" : "READ", | |
879 | (unsigned long) blkvsc_req->sector_start, | |
880 | blkvsc_req->sector_count, | |
881 | blkvsc_req->request.DataBuffer.Offset, | |
882 | blkvsc_req->request.DataBuffer.Length); | |
883 | #if 0 | |
884 | for (i = 0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++) { | |
885 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " | |
886 | "req %p pfn[%d] %llx\n", | |
887 | blkvsc_req, i, | |
888 | blkvsc_req->request.DataBuffer.PfnArray[i]); | |
889 | } | |
890 | #endif | |
f82bd046 HJ |
891 | |
892 | storvsc_req = &blkvsc_req->request; | |
8a280399 GKH |
893 | storvsc_req->Extension = (void *)((unsigned long)blkvsc_req + |
894 | sizeof(struct blkvsc_request)); | |
f82bd046 | 895 | |
8a280399 | 896 | storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; |
f82bd046 HJ |
897 | |
898 | storvsc_req->OnIOCompletion = request_completion; | |
899 | storvsc_req->Context = blkvsc_req; | |
900 | ||
901 | storvsc_req->Host = blkdev->port; | |
902 | storvsc_req->Bus = blkdev->path; | |
903 | storvsc_req->TargetId = blkdev->target; | |
454f18a9 | 904 | storvsc_req->LunId = 0; /* this is not really used at all */ |
f82bd046 HJ |
905 | |
906 | storvsc_req->CdbLen = blkvsc_req->cmd_len; | |
907 | storvsc_req->Cdb = blkvsc_req->cmnd; | |
908 | ||
909 | storvsc_req->SenseBuffer = blkvsc_req->sense_buffer; | |
910 | storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
911 | ||
8a280399 GKH |
912 | ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, |
913 | &blkvsc_req->request); | |
f82bd046 | 914 | if (ret == 0) |
f82bd046 | 915 | blkdev->num_outstanding_reqs++; |
f82bd046 HJ |
916 | |
917 | return ret; | |
918 | } | |
919 | ||
454f18a9 BP |
920 | /* |
921 | * We break the request into 1 or more blkvsc_requests and submit | |
922 | * them. If we cant submit them all, we put them on the | |
923 | * pending_list. The blkvsc_request() will work on the pending_list. | |
924 | */ | |
8a280399 GKH |
925 | static int blkvsc_do_request(struct block_device_context *blkdev, |
926 | struct request *req) | |
f82bd046 | 927 | { |
8a280399 GKH |
928 | struct bio *bio = NULL; |
929 | struct bio_vec *bvec = NULL; | |
930 | struct bio_vec *prev_bvec = NULL; | |
931 | struct blkvsc_request *blkvsc_req = NULL; | |
f82bd046 | 932 | struct blkvsc_request *tmp; |
8a280399 GKH |
933 | int databuf_idx = 0; |
934 | int seg_idx = 0; | |
f82bd046 HJ |
935 | sector_t start_sector; |
936 | unsigned long num_sectors = 0; | |
8a280399 GKH |
937 | int ret = 0; |
938 | int pending = 0; | |
939 | struct blkvsc_request_group *group = NULL; | |
f82bd046 | 940 | |
8a280399 GKH |
941 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu \n", blkdev, req, |
942 | (unsigned long)blk_rq_pos(req)); | |
f82bd046 | 943 | |
454f18a9 | 944 | /* Create a group to tie req to list of blkvsc_reqs */ |
8a280399 | 945 | group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); |
f82bd046 | 946 | if (!group) |
f82bd046 | 947 | return -ENOMEM; |
f82bd046 HJ |
948 | |
949 | INIT_LIST_HEAD(&group->blkvsc_req_list); | |
950 | group->outstanding = group->status = 0; | |
951 | ||
0fce4c2f | 952 | start_sector = blk_rq_pos(req); |
f82bd046 | 953 | |
454f18a9 | 954 | /* foreach bio in the request */ |
8a280399 GKH |
955 | if (req->bio) { |
956 | for (bio = req->bio; bio; bio = bio->bi_next) { | |
957 | /* | |
958 | * Map this bio into an existing or new storvsc request | |
959 | */ | |
960 | bio_for_each_segment(bvec, bio, seg_idx) { | |
961 | DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() " | |
962 | "- req %p bio %p bvec %p seg_idx %d " | |
963 | "databuf_idx %d\n", req, bio, bvec, | |
964 | seg_idx, databuf_idx); | |
965 | ||
966 | /* Get a new storvsc request */ | |
967 | /* 1st-time */ | |
968 | if ((!blkvsc_req) || | |
969 | (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) | |
970 | /* hole at the begin of page */ | |
971 | || (bvec->bv_offset != 0) || | |
972 | /* hold at the end of page */ | |
973 | (prev_bvec && | |
974 | (prev_bvec->bv_len != PAGE_SIZE))) { | |
975 | /* submit the prev one */ | |
976 | if (blkvsc_req) { | |
977 | blkvsc_req->sector_start = start_sector; | |
978 | sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
979 | ||
980 | blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
981 | blkvsc_init_rw(blkvsc_req); | |
f82bd046 HJ |
982 | } |
983 | ||
8a280399 GKH |
984 | /* |
985 | * Create new blkvsc_req to represent | |
986 | * the current bvec | |
987 | */ | |
988 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
989 | if (!blkvsc_req) { | |
990 | /* free up everything */ | |
991 | list_for_each_entry_safe( | |
992 | blkvsc_req, tmp, | |
993 | &group->blkvsc_req_list, | |
994 | req_entry) { | |
995 | list_del(&blkvsc_req->req_entry); | |
996 | kmem_cache_free(blkdev->request_pool, blkvsc_req); | |
997 | } | |
998 | ||
999 | kmem_cache_free(blkdev->request_pool, group); | |
1000 | return -ENOMEM; | |
1001 | } | |
f82bd046 | 1002 | |
8a280399 GKH |
1003 | memset(blkvsc_req, 0, |
1004 | sizeof(struct blkvsc_request)); | |
f82bd046 | 1005 | |
8a280399 GKH |
1006 | blkvsc_req->dev = blkdev; |
1007 | blkvsc_req->req = req; | |
1008 | blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset; | |
1009 | blkvsc_req->request.DataBuffer.Length = 0; | |
f82bd046 | 1010 | |
8a280399 GKH |
1011 | /* Add to the group */ |
1012 | blkvsc_req->group = group; | |
1013 | blkvsc_req->group->outstanding++; | |
1014 | list_add_tail(&blkvsc_req->req_entry, | |
1015 | &blkvsc_req->group->blkvsc_req_list); | |
f82bd046 | 1016 | |
8a280399 GKH |
1017 | start_sector += num_sectors; |
1018 | num_sectors = 0; | |
1019 | databuf_idx = 0; | |
1020 | } | |
f82bd046 | 1021 | |
8a280399 GKH |
1022 | /* Add the curr bvec/segment to the curr blkvsc_req */ |
1023 | blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page); | |
1024 | blkvsc_req->request.DataBuffer.Length += bvec->bv_len; | |
f82bd046 | 1025 | |
8a280399 | 1026 | prev_bvec = bvec; |
f82bd046 | 1027 | |
8a280399 GKH |
1028 | databuf_idx++; |
1029 | num_sectors += bvec->bv_len >> 9; | |
f82bd046 | 1030 | |
8a280399 | 1031 | } /* bio_for_each_segment */ |
f82bd046 | 1032 | |
8a280399 GKH |
1033 | } /* rq_for_each_bio */ |
1034 | } | |
f82bd046 | 1035 | |
454f18a9 | 1036 | /* Handle the last one */ |
8a280399 GKH |
1037 | if (blkvsc_req) { |
1038 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n", | |
1039 | blkdev, req, blkvsc_req->group, | |
1040 | blkvsc_req->group->outstanding); | |
f82bd046 HJ |
1041 | |
1042 | blkvsc_req->sector_start = start_sector; | |
8a280399 GKH |
1043 | sector_div(blkvsc_req->sector_start, |
1044 | (blkdev->sector_size >> 9)); | |
f82bd046 | 1045 | |
8a280399 GKH |
1046 | blkvsc_req->sector_count = num_sectors / |
1047 | (blkdev->sector_size >> 9); | |
f82bd046 HJ |
1048 | |
1049 | blkvsc_init_rw(blkvsc_req); | |
1050 | } | |
1051 | ||
8a280399 GKH |
1052 | list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { |
1053 | if (pending) { | |
1054 | DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to " | |
1055 | "pending_list - blkvsc_req %p start_sect %lu" | |
1056 | " sect_count %ld (%lu %ld)\n", blkvsc_req, | |
1057 | (unsigned long)blkvsc_req->sector_start, | |
1058 | blkvsc_req->sector_count, | |
1059 | (unsigned long)start_sector, | |
1060 | (unsigned long)num_sectors); | |
1061 | ||
1062 | list_add_tail(&blkvsc_req->pend_entry, | |
1063 | &blkdev->pending_list); | |
1064 | } else { | |
1065 | ret = blkvsc_submit_request(blkvsc_req, | |
1066 | blkvsc_request_completion); | |
1067 | if (ret == -1) { | |
f82bd046 | 1068 | pending = 1; |
8a280399 GKH |
1069 | list_add_tail(&blkvsc_req->pend_entry, |
1070 | &blkdev->pending_list); | |
f82bd046 HJ |
1071 | } |
1072 | ||
8a280399 GKH |
1073 | DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p " |
1074 | "start_sect %lu sect_count %ld (%lu %ld) " | |
1075 | "ret %d\n", blkvsc_req, | |
1076 | (unsigned long)blkvsc_req->sector_start, | |
1077 | blkvsc_req->sector_count, | |
1078 | (unsigned long)start_sector, | |
1079 | num_sectors, ret); | |
f82bd046 HJ |
1080 | } |
1081 | } | |
1082 | ||
1083 | return pending; | |
1084 | } | |
1085 | ||
0b3f6834 | 1086 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request) |
f82bd046 | 1087 | { |
8a280399 GKH |
1088 | struct blkvsc_request *blkvsc_req = |
1089 | (struct blkvsc_request *)request->Context; | |
1090 | struct block_device_context *blkdev = | |
1091 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1092 | struct scsi_sense_hdr sense_hdr; |
1093 | ||
8a280399 GKH |
1094 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", |
1095 | blkvsc_req); | |
f82bd046 HJ |
1096 | |
1097 | blkdev->num_outstanding_reqs--; | |
1098 | ||
1099 | if (blkvsc_req->request.Status) | |
8a280399 GKH |
1100 | if (scsi_normalize_sense(blkvsc_req->sense_buffer, |
1101 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
f82bd046 | 1102 | scsi_print_sense_hdr("blkvsc", &sense_hdr); |
f82bd046 | 1103 | |
8a280399 | 1104 | blkvsc_req->cond = 1; |
f82bd046 HJ |
1105 | wake_up_interruptible(&blkvsc_req->wevent); |
1106 | } | |
1107 | ||
0b3f6834 | 1108 | static void blkvsc_request_completion(struct hv_storvsc_request *request) |
f82bd046 | 1109 | { |
8a280399 GKH |
1110 | struct blkvsc_request *blkvsc_req = |
1111 | (struct blkvsc_request *)request->Context; | |
1112 | struct block_device_context *blkdev = | |
1113 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1114 | unsigned long flags; |
1115 | struct blkvsc_request *comp_req, *tmp; | |
1116 | ||
1117 | ASSERT(blkvsc_req->group); | |
1118 | ||
8a280399 GKH |
1119 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s " |
1120 | "sect_start %lu sect_count %ld len %d group outstd %d " | |
1121 | "total outstd %d\n", | |
1122 | blkdev, blkvsc_req, blkvsc_req->group, | |
1123 | (blkvsc_req->write) ? "WRITE" : "READ", | |
1124 | (unsigned long)blkvsc_req->sector_start, | |
1125 | blkvsc_req->sector_count, | |
1126 | blkvsc_req->request.DataBuffer.Length, | |
1127 | blkvsc_req->group->outstanding, | |
1128 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
1129 | |
1130 | spin_lock_irqsave(&blkdev->lock, flags); | |
1131 | ||
1132 | blkdev->num_outstanding_reqs--; | |
1133 | blkvsc_req->group->outstanding--; | |
1134 | ||
454f18a9 BP |
1135 | /* |
1136 | * Only start processing when all the blkvsc_reqs are | |
1137 | * completed. This guarantees no out-of-order blkvsc_req | |
1138 | * completion when calling end_that_request_first() | |
1139 | */ | |
8a280399 GKH |
1140 | if (blkvsc_req->group->outstanding == 0) { |
1141 | list_for_each_entry_safe(comp_req, tmp, | |
1142 | &blkvsc_req->group->blkvsc_req_list, | |
1143 | req_entry) { | |
1144 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1145 | "sect_start %lu sect_count %ld \n", | |
1146 | comp_req, | |
1147 | (unsigned long)comp_req->sector_start, | |
1148 | comp_req->sector_count); | |
f82bd046 HJ |
1149 | |
1150 | list_del(&comp_req->req_entry); | |
1151 | ||
8a280399 GKH |
1152 | if (!__blk_end_request(comp_req->req, |
1153 | (!comp_req->request.Status ? 0 : -EIO), | |
1154 | comp_req->sector_count * blkdev->sector_size)) { | |
1155 | /* | |
1156 | * All the sectors have been xferred ie the | |
1157 | * request is done | |
1158 | */ | |
1159 | DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", | |
1160 | comp_req->req); | |
1161 | kmem_cache_free(blkdev->request_pool, | |
1162 | comp_req->group); | |
f82bd046 | 1163 | } |
f82bd046 HJ |
1164 | |
1165 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1166 | } | |
1167 | ||
8a280399 | 1168 | if (!blkdev->shutting_down) { |
f82bd046 HJ |
1169 | blkvsc_do_pending_reqs(blkdev); |
1170 | blk_start_queue(blkdev->gd->queue); | |
1171 | blkvsc_request(blkdev->gd->queue); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
1176 | } | |
1177 | ||
1178 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) | |
1179 | { | |
1180 | struct blkvsc_request *pend_req, *tmp; | |
1181 | struct blkvsc_request *comp_req, *tmp2; | |
1182 | ||
8a280399 | 1183 | int ret = 0; |
f82bd046 HJ |
1184 | |
1185 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()"); | |
1186 | ||
454f18a9 | 1187 | /* Flush the pending list first */ |
8a280399 GKH |
1188 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1189 | pend_entry) { | |
454f18a9 BP |
1190 | /* |
1191 | * The pend_req could be part of a partially completed | |
1192 | * request. If so, complete those req first until we | |
1193 | * hit the pend_req | |
1194 | */ | |
8a280399 GKH |
1195 | list_for_each_entry_safe(comp_req, tmp2, |
1196 | &pend_req->group->blkvsc_req_list, | |
1197 | req_entry) { | |
1198 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1199 | "sect_start %lu sect_count %ld \n", | |
1200 | comp_req, | |
1201 | (unsigned long) comp_req->sector_start, | |
1202 | comp_req->sector_count); | |
f82bd046 HJ |
1203 | |
1204 | if (comp_req == pend_req) | |
1205 | break; | |
1206 | ||
1207 | list_del(&comp_req->req_entry); | |
1208 | ||
8a280399 GKH |
1209 | if (comp_req->req) { |
1210 | ret = __blk_end_request(comp_req->req, | |
1211 | (!comp_req->request.Status ? 0 : -EIO), | |
1212 | comp_req->sector_count * | |
1213 | blkdev->sector_size); | |
1214 | ASSERT(ret != 0); | |
f82bd046 HJ |
1215 | } |
1216 | ||
1217 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1218 | } | |
1219 | ||
8a280399 GKH |
1220 | DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n", |
1221 | pend_req); | |
f82bd046 HJ |
1222 | |
1223 | list_del(&pend_req->pend_entry); | |
1224 | ||
1225 | list_del(&pend_req->req_entry); | |
1226 | ||
8a280399 GKH |
1227 | if (comp_req->req) { |
1228 | if (!__blk_end_request(pend_req->req, -EIO, | |
1229 | pend_req->sector_count * | |
1230 | blkdev->sector_size)) { | |
1231 | /* | |
1232 | * All the sectors have been xferred ie the | |
1233 | * request is done | |
1234 | */ | |
1235 | DPRINT_DBG(BLKVSC_DRV, | |
1236 | "blkvsc_cancel_pending_reqs() - " | |
1237 | "req %p COMPLETED\n", pend_req->req); | |
1238 | kmem_cache_free(blkdev->request_pool, | |
1239 | pend_req->group); | |
1240 | } | |
f82bd046 HJ |
1241 | } |
1242 | ||
1243 | kmem_cache_free(blkdev->request_pool, pend_req); | |
1244 | } | |
1245 | ||
1246 | return ret; | |
1247 | } | |
1248 | ||
1249 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) | |
1250 | { | |
1251 | struct blkvsc_request *pend_req, *tmp; | |
8a280399 | 1252 | int ret = 0; |
f82bd046 | 1253 | |
454f18a9 | 1254 | /* Flush the pending list first */ |
8a280399 GKH |
1255 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1256 | pend_entry) { | |
1257 | DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", | |
1258 | pend_req); | |
f82bd046 | 1259 | |
8a280399 GKH |
1260 | ret = blkvsc_submit_request(pend_req, |
1261 | blkvsc_request_completion); | |
f82bd046 | 1262 | if (ret != 0) |
f82bd046 | 1263 | break; |
f82bd046 | 1264 | else |
f82bd046 | 1265 | list_del(&pend_req->pend_entry); |
f82bd046 HJ |
1266 | } |
1267 | ||
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | static void blkvsc_request(struct request_queue *queue) | |
1272 | { | |
1273 | struct block_device_context *blkdev = NULL; | |
1274 | struct request *req; | |
8a280399 | 1275 | int ret = 0; |
f82bd046 HJ |
1276 | |
1277 | DPRINT_DBG(BLKVSC_DRV, "- enter \n"); | |
8a280399 | 1278 | while ((req = blk_peek_request(queue)) != NULL) { |
f82bd046 HJ |
1279 | DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req); |
1280 | ||
1281 | blkdev = req->rq_disk->private_data; | |
8a280399 GKH |
1282 | if (blkdev->shutting_down || !blk_fs_request(req) || |
1283 | blkdev->media_not_present) { | |
0fce4c2f | 1284 | __blk_end_request_cur(req, 0); |
f82bd046 HJ |
1285 | continue; |
1286 | } | |
1287 | ||
1288 | ret = blkvsc_do_pending_reqs(blkdev); | |
1289 | ||
8a280399 GKH |
1290 | if (ret != 0) { |
1291 | DPRINT_DBG(BLKVSC_DRV, | |
1292 | "- stop queue - pending_list not empty\n"); | |
f82bd046 HJ |
1293 | blk_stop_queue(queue); |
1294 | break; | |
1295 | } | |
1296 | ||
0fce4c2f | 1297 | blk_start_request(req); |
f82bd046 HJ |
1298 | |
1299 | ret = blkvsc_do_request(blkdev, req); | |
8a280399 | 1300 | if (ret > 0) { |
f82bd046 HJ |
1301 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n"); |
1302 | blk_stop_queue(queue); | |
1303 | break; | |
8a280399 | 1304 | } else if (ret < 0) { |
f82bd046 HJ |
1305 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n"); |
1306 | blk_requeue_request(queue, req); | |
1307 | blk_stop_queue(queue); | |
1308 | break; | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | ||
8a280399 | 1313 | static int blkvsc_open(struct block_device *bdev, fmode_t mode) |
f82bd046 | 1314 | { |
39635f7d | 1315 | struct block_device_context *blkdev = bdev->bd_disk->private_data; |
f82bd046 | 1316 | |
8a280399 GKH |
1317 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1318 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1319 | |
1320 | spin_lock(&blkdev->lock); | |
1321 | ||
8a280399 | 1322 | if (!blkdev->users && blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1323 | spin_unlock(&blkdev->lock); |
39635f7d | 1324 | check_disk_change(bdev); |
f82bd046 HJ |
1325 | spin_lock(&blkdev->lock); |
1326 | } | |
1327 | ||
1328 | blkdev->users++; | |
1329 | ||
1330 | spin_unlock(&blkdev->lock); | |
1331 | return 0; | |
1332 | } | |
1333 | ||
77d2d9da | 1334 | static int blkvsc_release(struct gendisk *disk, fmode_t mode) |
f82bd046 | 1335 | { |
77d2d9da | 1336 | struct block_device_context *blkdev = disk->private_data; |
f82bd046 | 1337 | |
8a280399 GKH |
1338 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1339 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1340 | |
1341 | spin_lock(&blkdev->lock); | |
8a280399 | 1342 | if (blkdev->users == 1) { |
f82bd046 HJ |
1343 | spin_unlock(&blkdev->lock); |
1344 | blkvsc_do_flush(blkdev); | |
1345 | spin_lock(&blkdev->lock); | |
1346 | } | |
1347 | ||
1348 | blkdev->users--; | |
1349 | ||
1350 | spin_unlock(&blkdev->lock); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | static int blkvsc_media_changed(struct gendisk *gd) | |
1355 | { | |
1356 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
f82bd046 HJ |
1357 | return 1; |
1358 | } | |
1359 | ||
1360 | static int blkvsc_revalidate_disk(struct gendisk *gd) | |
1361 | { | |
1362 | struct block_device_context *blkdev = gd->private_data; | |
1363 | ||
1364 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1365 | ||
8a280399 | 1366 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1367 | blkvsc_do_read_capacity(blkdev); |
8a280399 GKH |
1368 | set_capacity(blkdev->gd, blkdev->capacity * |
1369 | (blkdev->sector_size/512)); | |
0fce4c2f | 1370 | blk_queue_logical_block_size(gd->queue, blkdev->sector_size); |
f82bd046 HJ |
1371 | } |
1372 | return 0; | |
1373 | } | |
1374 | ||
bd1de709 | 1375 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) |
f82bd046 HJ |
1376 | { |
1377 | sector_t total_sectors = get_capacity(bd->bd_disk); | |
8a280399 GKH |
1378 | sector_t cylinder_times_heads = 0; |
1379 | sector_t temp = 0; | |
f82bd046 | 1380 | |
8a280399 GKH |
1381 | int sectors_per_track = 0; |
1382 | int heads = 0; | |
1383 | int cylinders = 0; | |
1384 | int rem = 0; | |
f82bd046 | 1385 | |
8a280399 GKH |
1386 | if (total_sectors > (65535 * 16 * 255)) |
1387 | total_sectors = (65535 * 16 * 255); | |
f82bd046 | 1388 | |
8a280399 GKH |
1389 | if (total_sectors >= (65535 * 16 * 63)) { |
1390 | sectors_per_track = 255; | |
1391 | heads = 16; | |
f82bd046 HJ |
1392 | |
1393 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1394 | /* sector_div stores the quotient in cylinder_times_heads */ |
1395 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
1396 | } else { | |
1397 | sectors_per_track = 17; | |
f82bd046 HJ |
1398 | |
1399 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1400 | /* sector_div stores the quotient in cylinder_times_heads */ |
1401 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
f82bd046 HJ |
1402 | |
1403 | temp = cylinder_times_heads + 1023; | |
8a280399 GKH |
1404 | /* sector_div stores the quotient in temp */ |
1405 | rem = sector_div(temp, 1024); | |
f82bd046 HJ |
1406 | |
1407 | heads = temp; | |
1408 | ||
8a280399 GKH |
1409 | if (heads < 4) |
1410 | heads = 4; | |
1411 | ||
f82bd046 | 1412 | |
8a280399 GKH |
1413 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
1414 | sectors_per_track = 31; | |
1415 | heads = 16; | |
f82bd046 HJ |
1416 | |
1417 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1418 | /* |
1419 | * sector_div stores the quotient in | |
1420 | * cylinder_times_heads | |
1421 | */ | |
1422 | rem = sector_div(cylinder_times_heads, | |
1423 | sectors_per_track); | |
1424 | } | |
f82bd046 | 1425 | |
8a280399 GKH |
1426 | if (cylinder_times_heads >= (heads * 1024)) { |
1427 | sectors_per_track = 63; | |
1428 | heads = 16; | |
f82bd046 HJ |
1429 | |
1430 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1431 | /* |
1432 | * sector_div stores the quotient in | |
1433 | * cylinder_times_heads | |
1434 | */ | |
1435 | rem = sector_div(cylinder_times_heads, | |
1436 | sectors_per_track); | |
1437 | } | |
454f18a9 | 1438 | } |
f82bd046 HJ |
1439 | |
1440 | temp = cylinder_times_heads; | |
8a280399 GKH |
1441 | /* sector_div stores the quotient in temp */ |
1442 | rem = sector_div(temp, heads); | |
f82bd046 HJ |
1443 | cylinders = temp; |
1444 | ||
1445 | hg->heads = heads; | |
8a280399 GKH |
1446 | hg->sectors = sectors_per_track; |
1447 | hg->cylinders = cylinders; | |
f82bd046 | 1448 | |
8a280399 GKH |
1449 | DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1450 | sectors_per_track); | |
f82bd046 HJ |
1451 | |
1452 | return 0; | |
1453 | } | |
1454 | ||
dfe8b2d9 BP |
1455 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
1456 | unsigned cmd, unsigned long argument) | |
f82bd046 | 1457 | { |
b5788529 | 1458 | /* struct block_device_context *blkdev = bd->bd_disk->private_data; */ |
8a280399 | 1459 | int ret; |
f82bd046 | 1460 | |
8a280399 GKH |
1461 | switch (cmd) { |
1462 | /* | |
1463 | * TODO: I think there is certain format for HDIO_GET_IDENTITY rather | |
1464 | * than just a GUID. Commented it out for now. | |
1465 | */ | |
1466 | #if 0 | |
1467 | case HDIO_GET_IDENTITY: | |
f82bd046 | 1468 | DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); |
8a280399 GKH |
1469 | if (copy_to_user((void __user *)arg, blkdev->device_id, |
1470 | blkdev->device_id_len)) | |
f82bd046 | 1471 | ret = -EFAULT; |
8a280399 GKH |
1472 | break; |
1473 | #endif | |
f82bd046 HJ |
1474 | default: |
1475 | ret = -EINVAL; | |
1476 | break; | |
1477 | } | |
1478 | ||
1479 | return ret; | |
1480 | } | |
1481 | ||
f82bd046 HJ |
1482 | static int __init blkvsc_init(void) |
1483 | { | |
1484 | int ret; | |
1485 | ||
454f18a9 | 1486 | ASSERT(sizeof(sector_t) == 8); /* Make sure CONFIG_LBD is set */ |
f82bd046 HJ |
1487 | |
1488 | DPRINT_ENTER(BLKVSC_DRV); | |
1489 | ||
1490 | DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing...."); | |
1491 | ||
1492 | ret = blkvsc_drv_init(BlkVscInitialize); | |
1493 | ||
1494 | DPRINT_EXIT(BLKVSC_DRV); | |
1495 | ||
1496 | return ret; | |
1497 | } | |
1498 | ||
1499 | static void __exit blkvsc_exit(void) | |
1500 | { | |
1501 | DPRINT_ENTER(BLKVSC_DRV); | |
f82bd046 | 1502 | blkvsc_drv_exit(); |
f82bd046 HJ |
1503 | DPRINT_ENTER(BLKVSC_DRV); |
1504 | } | |
1505 | ||
8a280399 | 1506 | MODULE_LICENSE("GPL"); |
f82bd046 | 1507 | module_param(blkvsc_ringbuffer_size, int, S_IRUGO); |
f82bd046 HJ |
1508 | module_init(blkvsc_init); |
1509 | module_exit(blkvsc_exit); |