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); | |
8a280399 GKH |
366 | blk_queue_max_phys_segments(blkdev->gd->queue, |
367 | MAX_MULTIPAGE_BUFFER_COUNT); | |
368 | blk_queue_max_hw_segments(blkdev->gd->queue, | |
369 | MAX_MULTIPAGE_BUFFER_COUNT); | |
f82bd046 HJ |
370 | blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); |
371 | blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); | |
372 | blk_queue_dma_alignment(blkdev->gd->queue, 511); | |
373 | ||
374 | blkdev->gd->major = major; | |
375 | if (devnum == 1 || devnum == 3) | |
376 | blkdev->gd->first_minor = BLKVSC_MINORS; | |
377 | else | |
378 | blkdev->gd->first_minor = 0; | |
379 | blkdev->gd->fops = &block_ops; | |
380 | blkdev->gd->private_data = blkdev; | |
8a280399 | 381 | sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum); |
f82bd046 HJ |
382 | |
383 | blkvsc_do_inquiry(blkdev); | |
8a280399 | 384 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 HJ |
385 | set_disk_ro(blkdev->gd, 1); |
386 | blkdev->gd->flags |= GENHD_FL_REMOVABLE; | |
387 | blkvsc_do_read_capacity(blkdev); | |
8a280399 | 388 | } else { |
f82bd046 HJ |
389 | blkvsc_do_read_capacity16(blkdev); |
390 | } | |
391 | ||
392 | set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
0fce4c2f | 393 | blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); |
454f18a9 | 394 | /* go! */ |
f82bd046 HJ |
395 | add_disk(blkdev->gd); |
396 | ||
8a280399 GKH |
397 | DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", |
398 | blkdev->gd->disk_name, (unsigned long)blkdev->capacity, | |
399 | blkdev->sector_size); | |
f82bd046 HJ |
400 | |
401 | return ret; | |
402 | ||
403 | Remove: | |
404 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
405 | ||
406 | Cleanup: | |
8a280399 GKH |
407 | if (blkdev) { |
408 | if (blkdev->request_pool) { | |
f82bd046 HJ |
409 | kmem_cache_destroy(blkdev->request_pool); |
410 | blkdev->request_pool = NULL; | |
411 | } | |
412 | kfree(blkdev); | |
413 | blkdev = NULL; | |
414 | } | |
415 | ||
416 | DPRINT_EXIT(BLKVSC_DRV); | |
417 | ||
418 | return ret; | |
419 | } | |
420 | ||
421 | static void blkvsc_shutdown(struct device *device) | |
422 | { | |
b57a68dc | 423 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 HJ |
424 | unsigned long flags; |
425 | ||
426 | if (!blkdev) | |
427 | return; | |
428 | ||
8a280399 GKH |
429 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n", |
430 | blkdev->users, blkdev->gd->disk_name); | |
f82bd046 HJ |
431 | |
432 | spin_lock_irqsave(&blkdev->lock, flags); | |
433 | ||
434 | blkdev->shutting_down = 1; | |
435 | ||
436 | blk_stop_queue(blkdev->gd->queue); | |
437 | ||
438 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
439 | ||
8a280399 GKH |
440 | while (blkdev->num_outstanding_reqs) { |
441 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
442 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
443 | udelay(100); |
444 | } | |
445 | ||
446 | blkvsc_do_flush(blkdev); | |
447 | ||
448 | spin_lock_irqsave(&blkdev->lock, flags); | |
449 | ||
450 | blkvsc_cancel_pending_reqs(blkdev); | |
451 | ||
452 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
453 | } | |
454 | ||
455 | static int blkvsc_do_flush(struct block_device_context *blkdev) | |
456 | { | |
8a280399 | 457 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
458 | |
459 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n"); | |
460 | ||
461 | if (blkdev->device_type != HARDDISK_TYPE) | |
462 | return 0; | |
463 | ||
464 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
465 | if (!blkvsc_req) | |
f82bd046 | 466 | return -ENOMEM; |
f82bd046 HJ |
467 | |
468 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
469 | init_waitqueue_head(&blkvsc_req->wevent); | |
470 | blkvsc_req->dev = blkdev; | |
471 | blkvsc_req->req = NULL; | |
472 | blkvsc_req->write = 0; | |
473 | ||
474 | blkvsc_req->request.DataBuffer.PfnArray[0] = 0; | |
475 | blkvsc_req->request.DataBuffer.Offset = 0; | |
476 | blkvsc_req->request.DataBuffer.Length = 0; | |
477 | ||
478 | blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; | |
479 | blkvsc_req->cmd_len = 10; | |
480 | ||
8a280399 GKH |
481 | /* |
482 | * Set this here since the completion routine may be invoked and | |
483 | * completed before we return | |
484 | */ | |
485 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
486 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); |
487 | ||
488 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
489 | ||
490 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
454f18a9 | 495 | /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */ |
f82bd046 HJ |
496 | static int blkvsc_do_inquiry(struct block_device_context *blkdev) |
497 | { | |
8a280399 | 498 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
499 | struct page *page_buf; |
500 | unsigned char *buf; | |
501 | unsigned char device_type; | |
502 | ||
503 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n"); | |
504 | ||
505 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
506 | if (!blkvsc_req) | |
f82bd046 | 507 | return -ENOMEM; |
f82bd046 HJ |
508 | |
509 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
510 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 511 | if (!page_buf) { |
f82bd046 HJ |
512 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
513 | return -ENOMEM; | |
514 | } | |
515 | ||
516 | init_waitqueue_head(&blkvsc_req->wevent); | |
517 | blkvsc_req->dev = blkdev; | |
518 | blkvsc_req->req = NULL; | |
519 | blkvsc_req->write = 0; | |
520 | ||
521 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
522 | blkvsc_req->request.DataBuffer.Offset = 0; | |
523 | blkvsc_req->request.DataBuffer.Length = 64; | |
524 | ||
525 | blkvsc_req->cmnd[0] = INQUIRY; | |
454f18a9 BP |
526 | blkvsc_req->cmnd[1] = 0x1; /* Get product data */ |
527 | blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ | |
f82bd046 HJ |
528 | blkvsc_req->cmnd[4] = 64; |
529 | blkvsc_req->cmd_len = 6; | |
530 | ||
8a280399 GKH |
531 | /* |
532 | * Set this here since the completion routine may be invoked and | |
533 | * completed before we return | |
534 | */ | |
535 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
536 | |
537 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
538 | ||
8a280399 GKH |
539 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
540 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
541 | |
542 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
543 | ||
544 | buf = kmap(page_buf); | |
545 | ||
04f50c4d | 546 | /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */ |
454f18a9 | 547 | /* be to le */ |
f82bd046 HJ |
548 | device_type = buf[0] & 0x1F; |
549 | ||
8a280399 | 550 | if (device_type == 0x0) { |
f82bd046 | 551 | blkdev->device_type = HARDDISK_TYPE; |
8a280399 | 552 | } else if (device_type == 0x5) { |
f82bd046 | 553 | blkdev->device_type = DVD_TYPE; |
8a280399 | 554 | } else { |
454f18a9 | 555 | /* TODO: this is currently unsupported device type */ |
f82bd046 HJ |
556 | blkdev->device_type = UNKNOWN_DEV_TYPE; |
557 | } | |
558 | ||
559 | DPRINT_DBG(BLKVSC_DRV, "device type %d \n", device_type); | |
560 | ||
561 | blkdev->device_id_len = buf[7]; | |
562 | if (blkdev->device_id_len > 64) | |
563 | blkdev->device_id_len = 64; | |
564 | ||
565 | memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); | |
04f50c4d | 566 | /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id, |
454f18a9 | 567 | * blkdev->device_id_len); */ |
f82bd046 HJ |
568 | |
569 | kunmap(page_buf); | |
570 | ||
571 | __free_page(page_buf); | |
572 | ||
573 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
454f18a9 | 578 | /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */ |
f82bd046 HJ |
579 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev) |
580 | { | |
8a280399 | 581 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
582 | struct page *page_buf; |
583 | unsigned char *buf; | |
584 | struct scsi_sense_hdr sense_hdr; | |
585 | ||
586 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n"); | |
587 | ||
588 | blkdev->sector_size = 0; | |
589 | blkdev->capacity = 0; | |
454f18a9 | 590 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
591 | |
592 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
593 | if (!blkvsc_req) | |
f82bd046 | 594 | return -ENOMEM; |
f82bd046 HJ |
595 | |
596 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
597 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 598 | if (!page_buf) { |
f82bd046 HJ |
599 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
600 | return -ENOMEM; | |
601 | } | |
602 | ||
603 | init_waitqueue_head(&blkvsc_req->wevent); | |
604 | blkvsc_req->dev = blkdev; | |
605 | blkvsc_req->req = NULL; | |
606 | blkvsc_req->write = 0; | |
607 | ||
608 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
609 | blkvsc_req->request.DataBuffer.Offset = 0; | |
610 | blkvsc_req->request.DataBuffer.Length = 8; | |
611 | ||
612 | blkvsc_req->cmnd[0] = READ_CAPACITY; | |
613 | blkvsc_req->cmd_len = 16; | |
614 | ||
454f18a9 BP |
615 | /* |
616 | * Set this here since the completion routine may be invoked | |
617 | * and completed before we return | |
618 | */ | |
8a280399 | 619 | blkvsc_req->cond = 0; |
f82bd046 HJ |
620 | |
621 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
622 | ||
8a280399 GKH |
623 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
624 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
625 | |
626 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
627 | ||
454f18a9 | 628 | /* check error */ |
8a280399 GKH |
629 | if (blkvsc_req->request.Status) { |
630 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
631 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
f82bd046 | 632 | |
8a280399 GKH |
633 | if (sense_hdr.asc == 0x3A) { |
634 | /* Medium not present */ | |
f82bd046 HJ |
635 | blkdev->media_not_present = 1; |
636 | } | |
f82bd046 HJ |
637 | return 0; |
638 | } | |
639 | buf = kmap(page_buf); | |
640 | ||
454f18a9 | 641 | /* be to le */ |
8a280399 GKH |
642 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | |
643 | (buf[2] << 8) | buf[3]) + 1; | |
644 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
645 | (buf[6] << 8) | buf[7]; | |
f82bd046 HJ |
646 | |
647 | kunmap(page_buf); | |
648 | ||
649 | __free_page(page_buf); | |
650 | ||
651 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
f82bd046 HJ |
656 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev) |
657 | { | |
8a280399 | 658 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
659 | struct page *page_buf; |
660 | unsigned char *buf; | |
661 | struct scsi_sense_hdr sense_hdr; | |
662 | ||
663 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n"); | |
664 | ||
665 | blkdev->sector_size = 0; | |
666 | blkdev->capacity = 0; | |
454f18a9 | 667 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
668 | |
669 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
670 | if (!blkvsc_req) | |
f82bd046 | 671 | return -ENOMEM; |
f82bd046 HJ |
672 | |
673 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
674 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 675 | if (!page_buf) { |
f82bd046 HJ |
676 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
677 | return -ENOMEM; | |
678 | } | |
679 | ||
680 | init_waitqueue_head(&blkvsc_req->wevent); | |
681 | blkvsc_req->dev = blkdev; | |
682 | blkvsc_req->req = NULL; | |
683 | blkvsc_req->write = 0; | |
684 | ||
685 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
686 | blkvsc_req->request.DataBuffer.Offset = 0; | |
687 | blkvsc_req->request.DataBuffer.Length = 12; | |
688 | ||
454f18a9 | 689 | blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */ |
f82bd046 HJ |
690 | blkvsc_req->cmd_len = 16; |
691 | ||
454f18a9 BP |
692 | /* |
693 | * Set this here since the completion routine may be invoked | |
694 | * and completed before we return | |
695 | */ | |
8a280399 | 696 | blkvsc_req->cond = 0; |
f82bd046 HJ |
697 | |
698 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
699 | ||
8a280399 GKH |
700 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
701 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
702 | |
703 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
704 | ||
454f18a9 | 705 | /* check error */ |
8a280399 GKH |
706 | if (blkvsc_req->request.Status) { |
707 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
708 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
709 | if (sense_hdr.asc == 0x3A) { | |
710 | /* Medium not present */ | |
f82bd046 HJ |
711 | blkdev->media_not_present = 1; |
712 | } | |
f82bd046 HJ |
713 | return 0; |
714 | } | |
715 | buf = kmap(page_buf); | |
716 | ||
454f18a9 | 717 | /* be to le */ |
8a280399 GKH |
718 | blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1; |
719 | blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]); | |
f82bd046 | 720 | |
8a280399 GKH |
721 | #if 0 |
722 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | | |
723 | (buf[2] << 8) | buf[3]) + 1; | |
724 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
725 | (buf[6] << 8) | buf[7]; | |
726 | #endif | |
f82bd046 HJ |
727 | |
728 | kunmap(page_buf); | |
729 | ||
730 | __free_page(page_buf); | |
731 | ||
732 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
8a280399 GKH |
737 | /** |
738 | * blkvsc_remove() - Callback when our device is removed | |
739 | */ | |
f82bd046 HJ |
740 | static int blkvsc_remove(struct device *device) |
741 | { | |
8a280399 GKH |
742 | struct driver_context *driver_ctx = |
743 | driver_to_driver_context(device->driver); | |
744 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
745 | (struct blkvsc_driver_context *)driver_ctx; | |
746 | struct storvsc_driver_object *storvsc_drv_obj = | |
747 | &blkvsc_drv_ctx->drv_obj; | |
f82bd046 | 748 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 749 | struct hv_device *device_obj = &device_ctx->device_obj; |
b57a68dc | 750 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 | 751 | unsigned long flags; |
8a280399 | 752 | int ret; |
f82bd046 HJ |
753 | |
754 | DPRINT_ENTER(BLKVSC_DRV); | |
755 | ||
756 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n"); | |
757 | ||
8a280399 | 758 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
f82bd046 HJ |
759 | DPRINT_EXIT(BLKVSC_DRV); |
760 | return -1; | |
761 | } | |
762 | ||
8a280399 GKH |
763 | /* |
764 | * Call to the vsc driver to let it know that the device is being | |
765 | * removed | |
766 | */ | |
f82bd046 | 767 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
8a280399 | 768 | if (ret != 0) { |
454f18a9 | 769 | /* TODO: */ |
8a280399 GKH |
770 | DPRINT_ERR(BLKVSC_DRV, |
771 | "unable to remove blkvsc device (ret %d)", ret); | |
f82bd046 HJ |
772 | } |
773 | ||
454f18a9 | 774 | /* Get to a known state */ |
f82bd046 HJ |
775 | spin_lock_irqsave(&blkdev->lock, flags); |
776 | ||
777 | blkdev->shutting_down = 1; | |
778 | ||
779 | blk_stop_queue(blkdev->gd->queue); | |
780 | ||
781 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
782 | ||
8a280399 GKH |
783 | while (blkdev->num_outstanding_reqs) { |
784 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
785 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
786 | udelay(100); |
787 | } | |
788 | ||
789 | blkvsc_do_flush(blkdev); | |
790 | ||
791 | spin_lock_irqsave(&blkdev->lock, flags); | |
792 | ||
793 | blkvsc_cancel_pending_reqs(blkdev); | |
794 | ||
795 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
796 | ||
797 | blk_cleanup_queue(blkdev->gd->queue); | |
798 | ||
799 | del_gendisk(blkdev->gd); | |
800 | ||
801 | kmem_cache_destroy(blkdev->request_pool); | |
802 | ||
803 | kfree(blkdev); | |
804 | ||
805 | DPRINT_EXIT(BLKVSC_DRV); | |
806 | ||
807 | return ret; | |
808 | } | |
809 | ||
810 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) | |
811 | { | |
812 | ASSERT(blkvsc_req->req); | |
813 | ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); | |
814 | ||
815 | blkvsc_req->cmd_len = 16; | |
816 | ||
8a280399 GKH |
817 | if (blkvsc_req->sector_start > 0xffffffff) { |
818 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
819 | blkvsc_req->write = 1; |
820 | blkvsc_req->cmnd[0] = WRITE_16; | |
8a280399 | 821 | } else { |
f82bd046 HJ |
822 | blkvsc_req->write = 0; |
823 | blkvsc_req->cmnd[0] = READ_16; | |
824 | } | |
825 | ||
826 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
827 | ||
8a280399 GKH |
828 | *(unsigned long long *)&blkvsc_req->cmnd[2] = |
829 | cpu_to_be64(blkvsc_req->sector_start); | |
830 | *(unsigned int *)&blkvsc_req->cmnd[10] = | |
831 | cpu_to_be32(blkvsc_req->sector_count); | |
832 | } else if ((blkvsc_req->sector_count > 0xff) || | |
833 | (blkvsc_req->sector_start > 0x1fffff)) { | |
834 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
835 | blkvsc_req->write = 1; |
836 | blkvsc_req->cmnd[0] = WRITE_10; | |
8a280399 | 837 | } else { |
f82bd046 HJ |
838 | blkvsc_req->write = 0; |
839 | blkvsc_req->cmnd[0] = READ_10; | |
840 | } | |
841 | ||
842 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
843 | ||
8a280399 GKH |
844 | *(unsigned int *)&blkvsc_req->cmnd[2] = |
845 | cpu_to_be32(blkvsc_req->sector_start); | |
846 | *(unsigned short *)&blkvsc_req->cmnd[7] = | |
847 | cpu_to_be16(blkvsc_req->sector_count); | |
848 | } else { | |
849 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
850 | blkvsc_req->write = 1; |
851 | blkvsc_req->cmnd[0] = WRITE_6; | |
8a280399 | 852 | } else { |
f82bd046 HJ |
853 | blkvsc_req->write = 0; |
854 | blkvsc_req->cmnd[0] = READ_6; | |
855 | } | |
856 | ||
8a280399 GKH |
857 | *(unsigned int *)&blkvsc_req->cmnd[1] = |
858 | cpu_to_be32(blkvsc_req->sector_start) >> 8; | |
f82bd046 | 859 | blkvsc_req->cmnd[1] &= 0x1f; |
8a280399 | 860 | blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count; |
f82bd046 HJ |
861 | } |
862 | } | |
863 | ||
8a280399 GKH |
864 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, |
865 | void (*request_completion)(struct hv_storvsc_request *)) | |
f82bd046 HJ |
866 | { |
867 | struct block_device_context *blkdev = blkvsc_req->dev; | |
8a280399 GKH |
868 | struct device_context *device_ctx = blkdev->device_ctx; |
869 | struct driver_context *driver_ctx = | |
870 | driver_to_driver_context(device_ctx->device.driver); | |
871 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
872 | (struct blkvsc_driver_context *)driver_ctx; | |
873 | struct storvsc_driver_object *storvsc_drv_obj = | |
874 | &blkvsc_drv_ctx->drv_obj; | |
0b3f6834 | 875 | struct hv_storvsc_request *storvsc_req; |
8a280399 | 876 | int ret; |
f82bd046 | 877 | |
8a280399 GKH |
878 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " |
879 | "req %p type %s start_sector %lu count %ld offset %d " | |
880 | "len %d\n", blkvsc_req, | |
881 | (blkvsc_req->write) ? "WRITE" : "READ", | |
882 | (unsigned long) blkvsc_req->sector_start, | |
883 | blkvsc_req->sector_count, | |
884 | blkvsc_req->request.DataBuffer.Offset, | |
885 | blkvsc_req->request.DataBuffer.Length); | |
886 | #if 0 | |
887 | for (i = 0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++) { | |
888 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " | |
889 | "req %p pfn[%d] %llx\n", | |
890 | blkvsc_req, i, | |
891 | blkvsc_req->request.DataBuffer.PfnArray[i]); | |
892 | } | |
893 | #endif | |
f82bd046 HJ |
894 | |
895 | storvsc_req = &blkvsc_req->request; | |
8a280399 GKH |
896 | storvsc_req->Extension = (void *)((unsigned long)blkvsc_req + |
897 | sizeof(struct blkvsc_request)); | |
f82bd046 | 898 | |
8a280399 | 899 | storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; |
f82bd046 HJ |
900 | |
901 | storvsc_req->OnIOCompletion = request_completion; | |
902 | storvsc_req->Context = blkvsc_req; | |
903 | ||
904 | storvsc_req->Host = blkdev->port; | |
905 | storvsc_req->Bus = blkdev->path; | |
906 | storvsc_req->TargetId = blkdev->target; | |
454f18a9 | 907 | storvsc_req->LunId = 0; /* this is not really used at all */ |
f82bd046 HJ |
908 | |
909 | storvsc_req->CdbLen = blkvsc_req->cmd_len; | |
910 | storvsc_req->Cdb = blkvsc_req->cmnd; | |
911 | ||
912 | storvsc_req->SenseBuffer = blkvsc_req->sense_buffer; | |
913 | storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
914 | ||
8a280399 GKH |
915 | ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, |
916 | &blkvsc_req->request); | |
f82bd046 | 917 | if (ret == 0) |
f82bd046 | 918 | blkdev->num_outstanding_reqs++; |
f82bd046 HJ |
919 | |
920 | return ret; | |
921 | } | |
922 | ||
454f18a9 BP |
923 | /* |
924 | * We break the request into 1 or more blkvsc_requests and submit | |
925 | * them. If we cant submit them all, we put them on the | |
926 | * pending_list. The blkvsc_request() will work on the pending_list. | |
927 | */ | |
8a280399 GKH |
928 | static int blkvsc_do_request(struct block_device_context *blkdev, |
929 | struct request *req) | |
f82bd046 | 930 | { |
8a280399 GKH |
931 | struct bio *bio = NULL; |
932 | struct bio_vec *bvec = NULL; | |
933 | struct bio_vec *prev_bvec = NULL; | |
934 | struct blkvsc_request *blkvsc_req = NULL; | |
f82bd046 | 935 | struct blkvsc_request *tmp; |
8a280399 GKH |
936 | int databuf_idx = 0; |
937 | int seg_idx = 0; | |
f82bd046 HJ |
938 | sector_t start_sector; |
939 | unsigned long num_sectors = 0; | |
8a280399 GKH |
940 | int ret = 0; |
941 | int pending = 0; | |
942 | struct blkvsc_request_group *group = NULL; | |
f82bd046 | 943 | |
8a280399 GKH |
944 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu \n", blkdev, req, |
945 | (unsigned long)blk_rq_pos(req)); | |
f82bd046 | 946 | |
454f18a9 | 947 | /* Create a group to tie req to list of blkvsc_reqs */ |
8a280399 | 948 | group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); |
f82bd046 | 949 | if (!group) |
f82bd046 | 950 | return -ENOMEM; |
f82bd046 HJ |
951 | |
952 | INIT_LIST_HEAD(&group->blkvsc_req_list); | |
953 | group->outstanding = group->status = 0; | |
954 | ||
0fce4c2f | 955 | start_sector = blk_rq_pos(req); |
f82bd046 | 956 | |
454f18a9 | 957 | /* foreach bio in the request */ |
8a280399 GKH |
958 | if (req->bio) { |
959 | for (bio = req->bio; bio; bio = bio->bi_next) { | |
960 | /* | |
961 | * Map this bio into an existing or new storvsc request | |
962 | */ | |
963 | bio_for_each_segment(bvec, bio, seg_idx) { | |
964 | DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() " | |
965 | "- req %p bio %p bvec %p seg_idx %d " | |
966 | "databuf_idx %d\n", req, bio, bvec, | |
967 | seg_idx, databuf_idx); | |
968 | ||
969 | /* Get a new storvsc request */ | |
970 | /* 1st-time */ | |
971 | if ((!blkvsc_req) || | |
972 | (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) | |
973 | /* hole at the begin of page */ | |
974 | || (bvec->bv_offset != 0) || | |
975 | /* hold at the end of page */ | |
976 | (prev_bvec && | |
977 | (prev_bvec->bv_len != PAGE_SIZE))) { | |
978 | /* submit the prev one */ | |
979 | if (blkvsc_req) { | |
980 | blkvsc_req->sector_start = start_sector; | |
981 | sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
982 | ||
983 | blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
984 | blkvsc_init_rw(blkvsc_req); | |
f82bd046 HJ |
985 | } |
986 | ||
8a280399 GKH |
987 | /* |
988 | * Create new blkvsc_req to represent | |
989 | * the current bvec | |
990 | */ | |
991 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
992 | if (!blkvsc_req) { | |
993 | /* free up everything */ | |
994 | list_for_each_entry_safe( | |
995 | blkvsc_req, tmp, | |
996 | &group->blkvsc_req_list, | |
997 | req_entry) { | |
998 | list_del(&blkvsc_req->req_entry); | |
999 | kmem_cache_free(blkdev->request_pool, blkvsc_req); | |
1000 | } | |
1001 | ||
1002 | kmem_cache_free(blkdev->request_pool, group); | |
1003 | return -ENOMEM; | |
1004 | } | |
f82bd046 | 1005 | |
8a280399 GKH |
1006 | memset(blkvsc_req, 0, |
1007 | sizeof(struct blkvsc_request)); | |
f82bd046 | 1008 | |
8a280399 GKH |
1009 | blkvsc_req->dev = blkdev; |
1010 | blkvsc_req->req = req; | |
1011 | blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset; | |
1012 | blkvsc_req->request.DataBuffer.Length = 0; | |
f82bd046 | 1013 | |
8a280399 GKH |
1014 | /* Add to the group */ |
1015 | blkvsc_req->group = group; | |
1016 | blkvsc_req->group->outstanding++; | |
1017 | list_add_tail(&blkvsc_req->req_entry, | |
1018 | &blkvsc_req->group->blkvsc_req_list); | |
f82bd046 | 1019 | |
8a280399 GKH |
1020 | start_sector += num_sectors; |
1021 | num_sectors = 0; | |
1022 | databuf_idx = 0; | |
1023 | } | |
f82bd046 | 1024 | |
8a280399 GKH |
1025 | /* Add the curr bvec/segment to the curr blkvsc_req */ |
1026 | blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page); | |
1027 | blkvsc_req->request.DataBuffer.Length += bvec->bv_len; | |
f82bd046 | 1028 | |
8a280399 | 1029 | prev_bvec = bvec; |
f82bd046 | 1030 | |
8a280399 GKH |
1031 | databuf_idx++; |
1032 | num_sectors += bvec->bv_len >> 9; | |
f82bd046 | 1033 | |
8a280399 | 1034 | } /* bio_for_each_segment */ |
f82bd046 | 1035 | |
8a280399 GKH |
1036 | } /* rq_for_each_bio */ |
1037 | } | |
f82bd046 | 1038 | |
454f18a9 | 1039 | /* Handle the last one */ |
8a280399 GKH |
1040 | if (blkvsc_req) { |
1041 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n", | |
1042 | blkdev, req, blkvsc_req->group, | |
1043 | blkvsc_req->group->outstanding); | |
f82bd046 HJ |
1044 | |
1045 | blkvsc_req->sector_start = start_sector; | |
8a280399 GKH |
1046 | sector_div(blkvsc_req->sector_start, |
1047 | (blkdev->sector_size >> 9)); | |
f82bd046 | 1048 | |
8a280399 GKH |
1049 | blkvsc_req->sector_count = num_sectors / |
1050 | (blkdev->sector_size >> 9); | |
f82bd046 HJ |
1051 | |
1052 | blkvsc_init_rw(blkvsc_req); | |
1053 | } | |
1054 | ||
8a280399 GKH |
1055 | list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { |
1056 | if (pending) { | |
1057 | DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to " | |
1058 | "pending_list - blkvsc_req %p start_sect %lu" | |
1059 | " sect_count %ld (%lu %ld)\n", blkvsc_req, | |
1060 | (unsigned long)blkvsc_req->sector_start, | |
1061 | blkvsc_req->sector_count, | |
1062 | (unsigned long)start_sector, | |
1063 | (unsigned long)num_sectors); | |
1064 | ||
1065 | list_add_tail(&blkvsc_req->pend_entry, | |
1066 | &blkdev->pending_list); | |
1067 | } else { | |
1068 | ret = blkvsc_submit_request(blkvsc_req, | |
1069 | blkvsc_request_completion); | |
1070 | if (ret == -1) { | |
f82bd046 | 1071 | pending = 1; |
8a280399 GKH |
1072 | list_add_tail(&blkvsc_req->pend_entry, |
1073 | &blkdev->pending_list); | |
f82bd046 HJ |
1074 | } |
1075 | ||
8a280399 GKH |
1076 | DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p " |
1077 | "start_sect %lu sect_count %ld (%lu %ld) " | |
1078 | "ret %d\n", blkvsc_req, | |
1079 | (unsigned long)blkvsc_req->sector_start, | |
1080 | blkvsc_req->sector_count, | |
1081 | (unsigned long)start_sector, | |
1082 | num_sectors, ret); | |
f82bd046 HJ |
1083 | } |
1084 | } | |
1085 | ||
1086 | return pending; | |
1087 | } | |
1088 | ||
0b3f6834 | 1089 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request) |
f82bd046 | 1090 | { |
8a280399 GKH |
1091 | struct blkvsc_request *blkvsc_req = |
1092 | (struct blkvsc_request *)request->Context; | |
1093 | struct block_device_context *blkdev = | |
1094 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1095 | struct scsi_sense_hdr sense_hdr; |
1096 | ||
8a280399 GKH |
1097 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", |
1098 | blkvsc_req); | |
f82bd046 HJ |
1099 | |
1100 | blkdev->num_outstanding_reqs--; | |
1101 | ||
1102 | if (blkvsc_req->request.Status) | |
8a280399 GKH |
1103 | if (scsi_normalize_sense(blkvsc_req->sense_buffer, |
1104 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
f82bd046 | 1105 | scsi_print_sense_hdr("blkvsc", &sense_hdr); |
f82bd046 | 1106 | |
8a280399 | 1107 | blkvsc_req->cond = 1; |
f82bd046 HJ |
1108 | wake_up_interruptible(&blkvsc_req->wevent); |
1109 | } | |
1110 | ||
0b3f6834 | 1111 | static void blkvsc_request_completion(struct hv_storvsc_request *request) |
f82bd046 | 1112 | { |
8a280399 GKH |
1113 | struct blkvsc_request *blkvsc_req = |
1114 | (struct blkvsc_request *)request->Context; | |
1115 | struct block_device_context *blkdev = | |
1116 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1117 | unsigned long flags; |
1118 | struct blkvsc_request *comp_req, *tmp; | |
1119 | ||
1120 | ASSERT(blkvsc_req->group); | |
1121 | ||
8a280399 GKH |
1122 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s " |
1123 | "sect_start %lu sect_count %ld len %d group outstd %d " | |
1124 | "total outstd %d\n", | |
1125 | blkdev, blkvsc_req, blkvsc_req->group, | |
1126 | (blkvsc_req->write) ? "WRITE" : "READ", | |
1127 | (unsigned long)blkvsc_req->sector_start, | |
1128 | blkvsc_req->sector_count, | |
1129 | blkvsc_req->request.DataBuffer.Length, | |
1130 | blkvsc_req->group->outstanding, | |
1131 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
1132 | |
1133 | spin_lock_irqsave(&blkdev->lock, flags); | |
1134 | ||
1135 | blkdev->num_outstanding_reqs--; | |
1136 | blkvsc_req->group->outstanding--; | |
1137 | ||
454f18a9 BP |
1138 | /* |
1139 | * Only start processing when all the blkvsc_reqs are | |
1140 | * completed. This guarantees no out-of-order blkvsc_req | |
1141 | * completion when calling end_that_request_first() | |
1142 | */ | |
8a280399 GKH |
1143 | if (blkvsc_req->group->outstanding == 0) { |
1144 | list_for_each_entry_safe(comp_req, tmp, | |
1145 | &blkvsc_req->group->blkvsc_req_list, | |
1146 | req_entry) { | |
1147 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1148 | "sect_start %lu sect_count %ld \n", | |
1149 | comp_req, | |
1150 | (unsigned long)comp_req->sector_start, | |
1151 | comp_req->sector_count); | |
f82bd046 HJ |
1152 | |
1153 | list_del(&comp_req->req_entry); | |
1154 | ||
8a280399 GKH |
1155 | if (!__blk_end_request(comp_req->req, |
1156 | (!comp_req->request.Status ? 0 : -EIO), | |
1157 | comp_req->sector_count * blkdev->sector_size)) { | |
1158 | /* | |
1159 | * All the sectors have been xferred ie the | |
1160 | * request is done | |
1161 | */ | |
1162 | DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", | |
1163 | comp_req->req); | |
1164 | kmem_cache_free(blkdev->request_pool, | |
1165 | comp_req->group); | |
f82bd046 | 1166 | } |
f82bd046 HJ |
1167 | |
1168 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1169 | } | |
1170 | ||
8a280399 | 1171 | if (!blkdev->shutting_down) { |
f82bd046 HJ |
1172 | blkvsc_do_pending_reqs(blkdev); |
1173 | blk_start_queue(blkdev->gd->queue); | |
1174 | blkvsc_request(blkdev->gd->queue); | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
1179 | } | |
1180 | ||
1181 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) | |
1182 | { | |
1183 | struct blkvsc_request *pend_req, *tmp; | |
1184 | struct blkvsc_request *comp_req, *tmp2; | |
1185 | ||
8a280399 | 1186 | int ret = 0; |
f82bd046 HJ |
1187 | |
1188 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()"); | |
1189 | ||
454f18a9 | 1190 | /* Flush the pending list first */ |
8a280399 GKH |
1191 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1192 | pend_entry) { | |
454f18a9 BP |
1193 | /* |
1194 | * The pend_req could be part of a partially completed | |
1195 | * request. If so, complete those req first until we | |
1196 | * hit the pend_req | |
1197 | */ | |
8a280399 GKH |
1198 | list_for_each_entry_safe(comp_req, tmp2, |
1199 | &pend_req->group->blkvsc_req_list, | |
1200 | req_entry) { | |
1201 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1202 | "sect_start %lu sect_count %ld \n", | |
1203 | comp_req, | |
1204 | (unsigned long) comp_req->sector_start, | |
1205 | comp_req->sector_count); | |
f82bd046 HJ |
1206 | |
1207 | if (comp_req == pend_req) | |
1208 | break; | |
1209 | ||
1210 | list_del(&comp_req->req_entry); | |
1211 | ||
8a280399 GKH |
1212 | if (comp_req->req) { |
1213 | ret = __blk_end_request(comp_req->req, | |
1214 | (!comp_req->request.Status ? 0 : -EIO), | |
1215 | comp_req->sector_count * | |
1216 | blkdev->sector_size); | |
1217 | ASSERT(ret != 0); | |
f82bd046 HJ |
1218 | } |
1219 | ||
1220 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1221 | } | |
1222 | ||
8a280399 GKH |
1223 | DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n", |
1224 | pend_req); | |
f82bd046 HJ |
1225 | |
1226 | list_del(&pend_req->pend_entry); | |
1227 | ||
1228 | list_del(&pend_req->req_entry); | |
1229 | ||
8a280399 GKH |
1230 | if (comp_req->req) { |
1231 | if (!__blk_end_request(pend_req->req, -EIO, | |
1232 | pend_req->sector_count * | |
1233 | blkdev->sector_size)) { | |
1234 | /* | |
1235 | * All the sectors have been xferred ie the | |
1236 | * request is done | |
1237 | */ | |
1238 | DPRINT_DBG(BLKVSC_DRV, | |
1239 | "blkvsc_cancel_pending_reqs() - " | |
1240 | "req %p COMPLETED\n", pend_req->req); | |
1241 | kmem_cache_free(blkdev->request_pool, | |
1242 | pend_req->group); | |
1243 | } | |
f82bd046 HJ |
1244 | } |
1245 | ||
1246 | kmem_cache_free(blkdev->request_pool, pend_req); | |
1247 | } | |
1248 | ||
1249 | return ret; | |
1250 | } | |
1251 | ||
1252 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) | |
1253 | { | |
1254 | struct blkvsc_request *pend_req, *tmp; | |
8a280399 | 1255 | int ret = 0; |
f82bd046 | 1256 | |
454f18a9 | 1257 | /* Flush the pending list first */ |
8a280399 GKH |
1258 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1259 | pend_entry) { | |
1260 | DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", | |
1261 | pend_req); | |
f82bd046 | 1262 | |
8a280399 GKH |
1263 | ret = blkvsc_submit_request(pend_req, |
1264 | blkvsc_request_completion); | |
f82bd046 | 1265 | if (ret != 0) |
f82bd046 | 1266 | break; |
f82bd046 | 1267 | else |
f82bd046 | 1268 | list_del(&pend_req->pend_entry); |
f82bd046 HJ |
1269 | } |
1270 | ||
1271 | return ret; | |
1272 | } | |
1273 | ||
1274 | static void blkvsc_request(struct request_queue *queue) | |
1275 | { | |
1276 | struct block_device_context *blkdev = NULL; | |
1277 | struct request *req; | |
8a280399 | 1278 | int ret = 0; |
f82bd046 HJ |
1279 | |
1280 | DPRINT_DBG(BLKVSC_DRV, "- enter \n"); | |
8a280399 | 1281 | while ((req = blk_peek_request(queue)) != NULL) { |
f82bd046 HJ |
1282 | DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req); |
1283 | ||
1284 | blkdev = req->rq_disk->private_data; | |
8a280399 GKH |
1285 | if (blkdev->shutting_down || !blk_fs_request(req) || |
1286 | blkdev->media_not_present) { | |
0fce4c2f | 1287 | __blk_end_request_cur(req, 0); |
f82bd046 HJ |
1288 | continue; |
1289 | } | |
1290 | ||
1291 | ret = blkvsc_do_pending_reqs(blkdev); | |
1292 | ||
8a280399 GKH |
1293 | if (ret != 0) { |
1294 | DPRINT_DBG(BLKVSC_DRV, | |
1295 | "- stop queue - pending_list not empty\n"); | |
f82bd046 HJ |
1296 | blk_stop_queue(queue); |
1297 | break; | |
1298 | } | |
1299 | ||
0fce4c2f | 1300 | blk_start_request(req); |
f82bd046 HJ |
1301 | |
1302 | ret = blkvsc_do_request(blkdev, req); | |
8a280399 | 1303 | if (ret > 0) { |
f82bd046 HJ |
1304 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n"); |
1305 | blk_stop_queue(queue); | |
1306 | break; | |
8a280399 | 1307 | } else if (ret < 0) { |
f82bd046 HJ |
1308 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n"); |
1309 | blk_requeue_request(queue, req); | |
1310 | blk_stop_queue(queue); | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | } | |
1315 | ||
8a280399 | 1316 | static int blkvsc_open(struct block_device *bdev, fmode_t mode) |
f82bd046 | 1317 | { |
39635f7d | 1318 | struct block_device_context *blkdev = bdev->bd_disk->private_data; |
f82bd046 | 1319 | |
8a280399 GKH |
1320 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1321 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1322 | |
1323 | spin_lock(&blkdev->lock); | |
1324 | ||
8a280399 | 1325 | if (!blkdev->users && blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1326 | spin_unlock(&blkdev->lock); |
39635f7d | 1327 | check_disk_change(bdev); |
f82bd046 HJ |
1328 | spin_lock(&blkdev->lock); |
1329 | } | |
1330 | ||
1331 | blkdev->users++; | |
1332 | ||
1333 | spin_unlock(&blkdev->lock); | |
1334 | return 0; | |
1335 | } | |
1336 | ||
77d2d9da | 1337 | static int blkvsc_release(struct gendisk *disk, fmode_t mode) |
f82bd046 | 1338 | { |
77d2d9da | 1339 | struct block_device_context *blkdev = disk->private_data; |
f82bd046 | 1340 | |
8a280399 GKH |
1341 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1342 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1343 | |
1344 | spin_lock(&blkdev->lock); | |
8a280399 | 1345 | if (blkdev->users == 1) { |
f82bd046 HJ |
1346 | spin_unlock(&blkdev->lock); |
1347 | blkvsc_do_flush(blkdev); | |
1348 | spin_lock(&blkdev->lock); | |
1349 | } | |
1350 | ||
1351 | blkdev->users--; | |
1352 | ||
1353 | spin_unlock(&blkdev->lock); | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | static int blkvsc_media_changed(struct gendisk *gd) | |
1358 | { | |
1359 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
f82bd046 HJ |
1360 | return 1; |
1361 | } | |
1362 | ||
1363 | static int blkvsc_revalidate_disk(struct gendisk *gd) | |
1364 | { | |
1365 | struct block_device_context *blkdev = gd->private_data; | |
1366 | ||
1367 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1368 | ||
8a280399 | 1369 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1370 | blkvsc_do_read_capacity(blkdev); |
8a280399 GKH |
1371 | set_capacity(blkdev->gd, blkdev->capacity * |
1372 | (blkdev->sector_size/512)); | |
0fce4c2f | 1373 | blk_queue_logical_block_size(gd->queue, blkdev->sector_size); |
f82bd046 HJ |
1374 | } |
1375 | return 0; | |
1376 | } | |
1377 | ||
bd1de709 | 1378 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) |
f82bd046 HJ |
1379 | { |
1380 | sector_t total_sectors = get_capacity(bd->bd_disk); | |
8a280399 GKH |
1381 | sector_t cylinder_times_heads = 0; |
1382 | sector_t temp = 0; | |
f82bd046 | 1383 | |
8a280399 GKH |
1384 | int sectors_per_track = 0; |
1385 | int heads = 0; | |
1386 | int cylinders = 0; | |
1387 | int rem = 0; | |
f82bd046 | 1388 | |
8a280399 GKH |
1389 | if (total_sectors > (65535 * 16 * 255)) |
1390 | total_sectors = (65535 * 16 * 255); | |
f82bd046 | 1391 | |
8a280399 GKH |
1392 | if (total_sectors >= (65535 * 16 * 63)) { |
1393 | sectors_per_track = 255; | |
1394 | heads = 16; | |
f82bd046 HJ |
1395 | |
1396 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1397 | /* sector_div stores the quotient in cylinder_times_heads */ |
1398 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
1399 | } else { | |
1400 | sectors_per_track = 17; | |
f82bd046 HJ |
1401 | |
1402 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1403 | /* sector_div stores the quotient in cylinder_times_heads */ |
1404 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
f82bd046 HJ |
1405 | |
1406 | temp = cylinder_times_heads + 1023; | |
8a280399 GKH |
1407 | /* sector_div stores the quotient in temp */ |
1408 | rem = sector_div(temp, 1024); | |
f82bd046 HJ |
1409 | |
1410 | heads = temp; | |
1411 | ||
8a280399 GKH |
1412 | if (heads < 4) |
1413 | heads = 4; | |
1414 | ||
f82bd046 | 1415 | |
8a280399 GKH |
1416 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
1417 | sectors_per_track = 31; | |
1418 | heads = 16; | |
f82bd046 HJ |
1419 | |
1420 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1421 | /* |
1422 | * sector_div stores the quotient in | |
1423 | * cylinder_times_heads | |
1424 | */ | |
1425 | rem = sector_div(cylinder_times_heads, | |
1426 | sectors_per_track); | |
1427 | } | |
f82bd046 | 1428 | |
8a280399 GKH |
1429 | if (cylinder_times_heads >= (heads * 1024)) { |
1430 | sectors_per_track = 63; | |
1431 | heads = 16; | |
f82bd046 HJ |
1432 | |
1433 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1434 | /* |
1435 | * sector_div stores the quotient in | |
1436 | * cylinder_times_heads | |
1437 | */ | |
1438 | rem = sector_div(cylinder_times_heads, | |
1439 | sectors_per_track); | |
1440 | } | |
454f18a9 | 1441 | } |
f82bd046 HJ |
1442 | |
1443 | temp = cylinder_times_heads; | |
8a280399 GKH |
1444 | /* sector_div stores the quotient in temp */ |
1445 | rem = sector_div(temp, heads); | |
f82bd046 HJ |
1446 | cylinders = temp; |
1447 | ||
1448 | hg->heads = heads; | |
8a280399 GKH |
1449 | hg->sectors = sectors_per_track; |
1450 | hg->cylinders = cylinders; | |
f82bd046 | 1451 | |
8a280399 GKH |
1452 | DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1453 | sectors_per_track); | |
f82bd046 HJ |
1454 | |
1455 | return 0; | |
1456 | } | |
1457 | ||
dfe8b2d9 BP |
1458 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
1459 | unsigned cmd, unsigned long argument) | |
f82bd046 | 1460 | { |
b5788529 | 1461 | /* struct block_device_context *blkdev = bd->bd_disk->private_data; */ |
8a280399 | 1462 | int ret; |
f82bd046 | 1463 | |
8a280399 GKH |
1464 | switch (cmd) { |
1465 | /* | |
1466 | * TODO: I think there is certain format for HDIO_GET_IDENTITY rather | |
1467 | * than just a GUID. Commented it out for now. | |
1468 | */ | |
1469 | #if 0 | |
1470 | case HDIO_GET_IDENTITY: | |
f82bd046 | 1471 | DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); |
8a280399 GKH |
1472 | if (copy_to_user((void __user *)arg, blkdev->device_id, |
1473 | blkdev->device_id_len)) | |
f82bd046 | 1474 | ret = -EFAULT; |
8a280399 GKH |
1475 | break; |
1476 | #endif | |
f82bd046 HJ |
1477 | default: |
1478 | ret = -EINVAL; | |
1479 | break; | |
1480 | } | |
1481 | ||
1482 | return ret; | |
1483 | } | |
1484 | ||
f82bd046 HJ |
1485 | static int __init blkvsc_init(void) |
1486 | { | |
1487 | int ret; | |
1488 | ||
454f18a9 | 1489 | ASSERT(sizeof(sector_t) == 8); /* Make sure CONFIG_LBD is set */ |
f82bd046 HJ |
1490 | |
1491 | DPRINT_ENTER(BLKVSC_DRV); | |
1492 | ||
1493 | DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing...."); | |
1494 | ||
1495 | ret = blkvsc_drv_init(BlkVscInitialize); | |
1496 | ||
1497 | DPRINT_EXIT(BLKVSC_DRV); | |
1498 | ||
1499 | return ret; | |
1500 | } | |
1501 | ||
1502 | static void __exit blkvsc_exit(void) | |
1503 | { | |
1504 | DPRINT_ENTER(BLKVSC_DRV); | |
f82bd046 | 1505 | blkvsc_drv_exit(); |
f82bd046 HJ |
1506 | DPRINT_ENTER(BLKVSC_DRV); |
1507 | } | |
1508 | ||
8a280399 | 1509 | MODULE_LICENSE("GPL"); |
f82bd046 | 1510 | module_param(blkvsc_ringbuffer_size, int, S_IRUGO); |
f82bd046 HJ |
1511 | module_init(blkvsc_init); |
1512 | module_exit(blkvsc_exit); |