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Commit | Line | Data |
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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" |
26c14cc1 | 34 | #include "VersionInfo.h" |
870cde80 | 35 | #include "vmbus.h" |
731a7884 | 36 | #include "StorVscApi.h" |
f82bd046 | 37 | |
454f18a9 | 38 | |
f82bd046 HJ |
39 | #define BLKVSC_MINORS 64 |
40 | ||
f82bd046 HJ |
41 | enum blkvsc_device_type { |
42 | UNKNOWN_DEV_TYPE, | |
43 | HARDDISK_TYPE, | |
44 | DVD_TYPE, | |
45 | }; | |
46 | ||
454f18a9 BP |
47 | /* |
48 | * This request ties the struct request and struct | |
0b3f6834 | 49 | * blkvsc_request/hv_storvsc_request together A struct request may be |
454f18a9 BP |
50 | * represented by 1 or more struct blkvsc_request |
51 | */ | |
f82bd046 | 52 | struct blkvsc_request_group { |
8a280399 GKH |
53 | int outstanding; |
54 | int status; | |
55 | struct list_head blkvsc_req_list; /* list of blkvsc_requests */ | |
f82bd046 HJ |
56 | }; |
57 | ||
f82bd046 | 58 | struct blkvsc_request { |
8a280399 GKH |
59 | /* blkvsc_request_group.blkvsc_req_list */ |
60 | struct list_head req_entry; | |
61 | ||
62 | /* block_device_context.pending_list */ | |
63 | struct list_head pend_entry; | |
64 | ||
65 | /* This may be null if we generate a request internally */ | |
66 | struct request *req; | |
f82bd046 | 67 | |
8a280399 | 68 | struct block_device_context *dev; |
f82bd046 | 69 | |
8a280399 GKH |
70 | /* The group this request is part of. Maybe null */ |
71 | struct blkvsc_request_group *group; | |
f82bd046 | 72 | |
8a280399 | 73 | wait_queue_head_t wevent; |
f82bd046 HJ |
74 | int cond; |
75 | ||
8a280399 GKH |
76 | int write; |
77 | sector_t sector_start; | |
78 | unsigned long sector_count; | |
f82bd046 HJ |
79 | |
80 | unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; | |
81 | unsigned char cmd_len; | |
82 | unsigned char cmnd[MAX_COMMAND_SIZE]; | |
83 | ||
0b3f6834 | 84 | struct hv_storvsc_request request; |
8a280399 GKH |
85 | /* |
86 | * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap, | |
87 | * because - The extension buffer falls right here and is pointed to by | |
88 | * request.Extension; | |
89 | * Which sounds like a horrible idea, who designed this? | |
90 | */ | |
f82bd046 HJ |
91 | }; |
92 | ||
454f18a9 | 93 | /* Per device structure */ |
f82bd046 | 94 | struct block_device_context { |
8a280399 GKH |
95 | /* point back to our device context */ |
96 | struct device_context *device_ctx; | |
97 | struct kmem_cache *request_pool; | |
98 | spinlock_t lock; | |
99 | struct gendisk *gd; | |
f82bd046 | 100 | enum blkvsc_device_type device_type; |
8a280399 GKH |
101 | struct list_head pending_list; |
102 | ||
103 | unsigned char device_id[64]; | |
104 | unsigned int device_id_len; | |
105 | int num_outstanding_reqs; | |
106 | int shutting_down; | |
107 | int media_not_present; | |
108 | unsigned int sector_size; | |
109 | sector_t capacity; | |
110 | unsigned int port; | |
111 | unsigned char path; | |
112 | unsigned char target; | |
113 | int users; | |
f82bd046 HJ |
114 | }; |
115 | ||
454f18a9 | 116 | /* Per driver */ |
f82bd046 | 117 | struct blkvsc_driver_context { |
454f18a9 | 118 | /* !! These must be the first 2 fields !! */ |
8a280399 GKH |
119 | /* FIXME this is a bug! */ |
120 | struct driver_context drv_ctx; | |
9f0c7d2c | 121 | struct storvsc_driver_object drv_obj; |
f82bd046 HJ |
122 | }; |
123 | ||
454f18a9 | 124 | /* Static decl */ |
f82bd046 HJ |
125 | static int blkvsc_probe(struct device *dev); |
126 | static int blkvsc_remove(struct device *device); | |
127 | static void blkvsc_shutdown(struct device *device); | |
128 | ||
39635f7d | 129 | static int blkvsc_open(struct block_device *bdev, fmode_t mode); |
77d2d9da | 130 | static int blkvsc_release(struct gendisk *disk, fmode_t mode); |
f82bd046 HJ |
131 | static int blkvsc_media_changed(struct gendisk *gd); |
132 | static int blkvsc_revalidate_disk(struct gendisk *gd); | |
133 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg); | |
dfe8b2d9 BP |
134 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
135 | unsigned cmd, unsigned long argument); | |
f82bd046 | 136 | static void blkvsc_request(struct request_queue *queue); |
0b3f6834 | 137 | static void blkvsc_request_completion(struct hv_storvsc_request *request); |
8a280399 GKH |
138 | static int blkvsc_do_request(struct block_device_context *blkdev, |
139 | struct request *req); | |
140 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, | |
141 | void (*request_completion)(struct hv_storvsc_request *)); | |
f82bd046 | 142 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); |
0b3f6834 | 143 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request); |
f82bd046 HJ |
144 | static int blkvsc_do_inquiry(struct block_device_context *blkdev); |
145 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev); | |
146 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev); | |
147 | static int blkvsc_do_flush(struct block_device_context *blkdev); | |
148 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev); | |
149 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev); | |
150 | ||
151 | ||
152 | static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; | |
153 | ||
454f18a9 | 154 | /* The one and only one */ |
f82bd046 HJ |
155 | static struct blkvsc_driver_context g_blkvsc_drv; |
156 | ||
8a280399 | 157 | static struct block_device_operations block_ops = { |
f82bd046 HJ |
158 | .owner = THIS_MODULE, |
159 | .open = blkvsc_open, | |
160 | .release = blkvsc_release, | |
161 | .media_changed = blkvsc_media_changed, | |
162 | .revalidate_disk = blkvsc_revalidate_disk, | |
163 | .getgeo = blkvsc_getgeo, | |
164 | .ioctl = blkvsc_ioctl, | |
165 | }; | |
166 | ||
8a280399 GKH |
167 | /** |
168 | * blkvsc_drv_init - BlkVsc driver initialization. | |
169 | */ | |
21707bed | 170 | static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
f82bd046 | 171 | { |
9f0c7d2c | 172 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
173 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
174 | int ret; | |
f82bd046 HJ |
175 | |
176 | DPRINT_ENTER(BLKVSC_DRV); | |
177 | ||
178 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
179 | ||
180 | storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size; | |
181 | ||
454f18a9 | 182 | /* Callback to client driver to complete the initialization */ |
21707bed | 183 | drv_init(&storvsc_drv_obj->Base); |
f82bd046 HJ |
184 | |
185 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
8a280399 GKH |
186 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
187 | sizeof(struct hv_guid)); | |
f82bd046 | 188 | |
f82bd046 HJ |
189 | drv_ctx->probe = blkvsc_probe; |
190 | drv_ctx->remove = blkvsc_remove; | |
191 | drv_ctx->shutdown = blkvsc_shutdown; | |
f82bd046 | 192 | |
454f18a9 | 193 | /* The driver belongs to vmbus */ |
5d48a1c2 | 194 | ret = vmbus_child_driver_register(drv_ctx); |
f82bd046 HJ |
195 | |
196 | DPRINT_EXIT(BLKVSC_DRV); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
f82bd046 HJ |
201 | static int blkvsc_drv_exit_cb(struct device *dev, void *data) |
202 | { | |
203 | struct device **curr = (struct device **)data; | |
204 | *curr = dev; | |
454f18a9 | 205 | return 1; /* stop iterating */ |
f82bd046 HJ |
206 | } |
207 | ||
bd1de709 | 208 | static void blkvsc_drv_exit(void) |
f82bd046 | 209 | { |
9f0c7d2c | 210 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
211 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
212 | struct device *current_dev; | |
2295ba2e | 213 | int ret; |
f82bd046 | 214 | |
f82bd046 HJ |
215 | DPRINT_ENTER(BLKVSC_DRV); |
216 | ||
8a280399 | 217 | while (1) { |
f82bd046 HJ |
218 | current_dev = NULL; |
219 | ||
454f18a9 | 220 | /* Get the device */ |
2295ba2e BP |
221 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
222 | (void *) ¤t_dev, | |
223 | blkvsc_drv_exit_cb); | |
224 | ||
225 | if (ret) | |
226 | DPRINT_WARN(BLKVSC_DRV, | |
227 | "driver_for_each_device returned %d", ret); | |
228 | ||
f82bd046 HJ |
229 | |
230 | if (current_dev == NULL) | |
231 | break; | |
232 | ||
454f18a9 | 233 | /* Initiate removal from the top-down */ |
f82bd046 HJ |
234 | device_unregister(current_dev); |
235 | } | |
236 | ||
237 | if (storvsc_drv_obj->Base.OnCleanup) | |
238 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
239 | ||
240 | vmbus_child_driver_unregister(drv_ctx); | |
241 | ||
242 | DPRINT_EXIT(BLKVSC_DRV); | |
243 | ||
244 | return; | |
245 | } | |
246 | ||
8a280399 GKH |
247 | /** |
248 | * blkvsc_probe - Add a new device for this driver | |
249 | */ | |
f82bd046 HJ |
250 | static int blkvsc_probe(struct device *device) |
251 | { | |
8a280399 GKH |
252 | struct driver_context *driver_ctx = |
253 | driver_to_driver_context(device->driver); | |
254 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
255 | (struct blkvsc_driver_context *)driver_ctx; | |
256 | struct storvsc_driver_object *storvsc_drv_obj = | |
257 | &blkvsc_drv_ctx->drv_obj; | |
f82bd046 | 258 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 259 | struct hv_device *device_obj = &device_ctx->device_obj; |
f82bd046 | 260 | |
8a280399 | 261 | struct block_device_context *blkdev = NULL; |
9f0c7d2c | 262 | struct storvsc_device_info device_info; |
8a280399 GKH |
263 | int major = 0; |
264 | int devnum = 0; | |
265 | int ret = 0; | |
266 | static int ide0_registered; | |
267 | static int ide1_registered; | |
f82bd046 HJ |
268 | |
269 | DPRINT_ENTER(BLKVSC_DRV); | |
270 | ||
271 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter"); | |
272 | ||
8a280399 | 273 | if (!storvsc_drv_obj->Base.OnDeviceAdd) { |
f82bd046 | 274 | DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set"); |
f82bd046 HJ |
275 | ret = -1; |
276 | goto Cleanup; | |
277 | } | |
278 | ||
279 | blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); | |
8a280399 | 280 | if (!blkdev) { |
f82bd046 HJ |
281 | ret = -ENOMEM; |
282 | goto Cleanup; | |
283 | } | |
284 | ||
285 | INIT_LIST_HEAD(&blkdev->pending_list); | |
286 | ||
454f18a9 | 287 | /* Initialize what we can here */ |
f82bd046 HJ |
288 | spin_lock_init(&blkdev->lock); |
289 | ||
8a280399 GKH |
290 | ASSERT(sizeof(struct blkvsc_request_group) <= |
291 | sizeof(struct blkvsc_request)); | |
f82bd046 | 292 | |
454f18a9 | 293 | blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device), |
8a280399 GKH |
294 | sizeof(struct blkvsc_request) + |
295 | storvsc_drv_obj->RequestExtSize, 0, | |
296 | SLAB_HWCACHE_ALIGN, NULL); | |
297 | if (!blkdev->request_pool) { | |
f82bd046 HJ |
298 | ret = -ENOMEM; |
299 | goto Cleanup; | |
300 | } | |
301 | ||
302 | ||
454f18a9 | 303 | /* Call to the vsc driver to add the device */ |
f82bd046 | 304 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info); |
8a280399 | 305 | if (ret != 0) { |
f82bd046 HJ |
306 | DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device"); |
307 | goto Cleanup; | |
308 | } | |
309 | ||
310 | blkdev->device_ctx = device_ctx; | |
8a280399 GKH |
311 | /* this identified the device 0 or 1 */ |
312 | blkdev->target = device_info.TargetId; | |
313 | /* this identified the ide ctrl 0 or 1 */ | |
314 | blkdev->path = device_info.PathId; | |
f82bd046 | 315 | |
b57a68dc | 316 | dev_set_drvdata(device, blkdev); |
f82bd046 | 317 | |
454f18a9 | 318 | /* Calculate the major and device num */ |
8a280399 | 319 | if (blkdev->path == 0) { |
f82bd046 | 320 | major = IDE0_MAJOR; |
454f18a9 | 321 | devnum = blkdev->path + blkdev->target; /* 0 or 1 */ |
f82bd046 | 322 | |
8a280399 | 323 | if (!ide0_registered) { |
f82bd046 | 324 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
325 | if (ret != 0) { |
326 | DPRINT_ERR(BLKVSC_DRV, | |
327 | "register_blkdev() failed! ret %d", | |
328 | ret); | |
f82bd046 HJ |
329 | goto Remove; |
330 | } | |
331 | ||
332 | ide0_registered = 1; | |
333 | } | |
8a280399 | 334 | } else if (blkdev->path == 1) { |
f82bd046 | 335 | major = IDE1_MAJOR; |
454f18a9 | 336 | devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */ |
f82bd046 | 337 | |
8a280399 | 338 | if (!ide1_registered) { |
f82bd046 | 339 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
340 | if (ret != 0) { |
341 | DPRINT_ERR(BLKVSC_DRV, | |
342 | "register_blkdev() failed! ret %d", | |
343 | ret); | |
f82bd046 HJ |
344 | goto Remove; |
345 | } | |
346 | ||
347 | ide1_registered = 1; | |
348 | } | |
8a280399 | 349 | } else { |
f82bd046 HJ |
350 | DPRINT_ERR(BLKVSC_DRV, "invalid pathid"); |
351 | ret = -1; | |
352 | goto Cleanup; | |
353 | } | |
354 | ||
355 | DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major); | |
356 | ||
357 | blkdev->gd = alloc_disk(BLKVSC_MINORS); | |
8a280399 | 358 | if (!blkdev->gd) { |
f82bd046 HJ |
359 | DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); |
360 | ret = -1; | |
361 | goto Cleanup; | |
362 | } | |
363 | ||
364 | blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); | |
365 | ||
366 | blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); | |
8a280399 GKH |
367 | blk_queue_max_phys_segments(blkdev->gd->queue, |
368 | MAX_MULTIPAGE_BUFFER_COUNT); | |
369 | blk_queue_max_hw_segments(blkdev->gd->queue, | |
370 | MAX_MULTIPAGE_BUFFER_COUNT); | |
f82bd046 HJ |
371 | blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); |
372 | blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); | |
373 | blk_queue_dma_alignment(blkdev->gd->queue, 511); | |
374 | ||
375 | blkdev->gd->major = major; | |
376 | if (devnum == 1 || devnum == 3) | |
377 | blkdev->gd->first_minor = BLKVSC_MINORS; | |
378 | else | |
379 | blkdev->gd->first_minor = 0; | |
380 | blkdev->gd->fops = &block_ops; | |
381 | blkdev->gd->private_data = blkdev; | |
8a280399 | 382 | sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum); |
f82bd046 HJ |
383 | |
384 | blkvsc_do_inquiry(blkdev); | |
8a280399 | 385 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 HJ |
386 | set_disk_ro(blkdev->gd, 1); |
387 | blkdev->gd->flags |= GENHD_FL_REMOVABLE; | |
388 | blkvsc_do_read_capacity(blkdev); | |
8a280399 | 389 | } else { |
f82bd046 HJ |
390 | blkvsc_do_read_capacity16(blkdev); |
391 | } | |
392 | ||
393 | set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
0fce4c2f | 394 | blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); |
454f18a9 | 395 | /* go! */ |
f82bd046 HJ |
396 | add_disk(blkdev->gd); |
397 | ||
8a280399 GKH |
398 | DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", |
399 | blkdev->gd->disk_name, (unsigned long)blkdev->capacity, | |
400 | blkdev->sector_size); | |
f82bd046 HJ |
401 | |
402 | return ret; | |
403 | ||
404 | Remove: | |
405 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
406 | ||
407 | Cleanup: | |
8a280399 GKH |
408 | if (blkdev) { |
409 | if (blkdev->request_pool) { | |
f82bd046 HJ |
410 | kmem_cache_destroy(blkdev->request_pool); |
411 | blkdev->request_pool = NULL; | |
412 | } | |
413 | kfree(blkdev); | |
414 | blkdev = NULL; | |
415 | } | |
416 | ||
417 | DPRINT_EXIT(BLKVSC_DRV); | |
418 | ||
419 | return ret; | |
420 | } | |
421 | ||
422 | static void blkvsc_shutdown(struct device *device) | |
423 | { | |
b57a68dc | 424 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 HJ |
425 | unsigned long flags; |
426 | ||
427 | if (!blkdev) | |
428 | return; | |
429 | ||
8a280399 GKH |
430 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n", |
431 | blkdev->users, blkdev->gd->disk_name); | |
f82bd046 HJ |
432 | |
433 | spin_lock_irqsave(&blkdev->lock, flags); | |
434 | ||
435 | blkdev->shutting_down = 1; | |
436 | ||
437 | blk_stop_queue(blkdev->gd->queue); | |
438 | ||
439 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
440 | ||
8a280399 GKH |
441 | while (blkdev->num_outstanding_reqs) { |
442 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
443 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
444 | udelay(100); |
445 | } | |
446 | ||
447 | blkvsc_do_flush(blkdev); | |
448 | ||
449 | spin_lock_irqsave(&blkdev->lock, flags); | |
450 | ||
451 | blkvsc_cancel_pending_reqs(blkdev); | |
452 | ||
453 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
454 | } | |
455 | ||
456 | static int blkvsc_do_flush(struct block_device_context *blkdev) | |
457 | { | |
8a280399 | 458 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
459 | |
460 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n"); | |
461 | ||
462 | if (blkdev->device_type != HARDDISK_TYPE) | |
463 | return 0; | |
464 | ||
465 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
466 | if (!blkvsc_req) | |
f82bd046 | 467 | return -ENOMEM; |
f82bd046 HJ |
468 | |
469 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
470 | init_waitqueue_head(&blkvsc_req->wevent); | |
471 | blkvsc_req->dev = blkdev; | |
472 | blkvsc_req->req = NULL; | |
473 | blkvsc_req->write = 0; | |
474 | ||
475 | blkvsc_req->request.DataBuffer.PfnArray[0] = 0; | |
476 | blkvsc_req->request.DataBuffer.Offset = 0; | |
477 | blkvsc_req->request.DataBuffer.Length = 0; | |
478 | ||
479 | blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; | |
480 | blkvsc_req->cmd_len = 10; | |
481 | ||
8a280399 GKH |
482 | /* |
483 | * Set this here since the completion routine may be invoked and | |
484 | * completed before we return | |
485 | */ | |
486 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
487 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); |
488 | ||
489 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
490 | ||
491 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
454f18a9 | 496 | /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */ |
f82bd046 HJ |
497 | static int blkvsc_do_inquiry(struct block_device_context *blkdev) |
498 | { | |
8a280399 | 499 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
500 | struct page *page_buf; |
501 | unsigned char *buf; | |
502 | unsigned char device_type; | |
503 | ||
504 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n"); | |
505 | ||
506 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
507 | if (!blkvsc_req) | |
f82bd046 | 508 | return -ENOMEM; |
f82bd046 HJ |
509 | |
510 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
511 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 512 | if (!page_buf) { |
f82bd046 HJ |
513 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
514 | return -ENOMEM; | |
515 | } | |
516 | ||
517 | init_waitqueue_head(&blkvsc_req->wevent); | |
518 | blkvsc_req->dev = blkdev; | |
519 | blkvsc_req->req = NULL; | |
520 | blkvsc_req->write = 0; | |
521 | ||
522 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
523 | blkvsc_req->request.DataBuffer.Offset = 0; | |
524 | blkvsc_req->request.DataBuffer.Length = 64; | |
525 | ||
526 | blkvsc_req->cmnd[0] = INQUIRY; | |
454f18a9 BP |
527 | blkvsc_req->cmnd[1] = 0x1; /* Get product data */ |
528 | blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ | |
f82bd046 HJ |
529 | blkvsc_req->cmnd[4] = 64; |
530 | blkvsc_req->cmd_len = 6; | |
531 | ||
8a280399 GKH |
532 | /* |
533 | * Set this here since the completion routine may be invoked and | |
534 | * completed before we return | |
535 | */ | |
536 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
537 | |
538 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
539 | ||
8a280399 GKH |
540 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
541 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
542 | |
543 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
544 | ||
545 | buf = kmap(page_buf); | |
546 | ||
04f50c4d | 547 | /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */ |
454f18a9 | 548 | /* be to le */ |
f82bd046 HJ |
549 | device_type = buf[0] & 0x1F; |
550 | ||
8a280399 | 551 | if (device_type == 0x0) { |
f82bd046 | 552 | blkdev->device_type = HARDDISK_TYPE; |
8a280399 | 553 | } else if (device_type == 0x5) { |
f82bd046 | 554 | blkdev->device_type = DVD_TYPE; |
8a280399 | 555 | } else { |
454f18a9 | 556 | /* TODO: this is currently unsupported device type */ |
f82bd046 HJ |
557 | blkdev->device_type = UNKNOWN_DEV_TYPE; |
558 | } | |
559 | ||
560 | DPRINT_DBG(BLKVSC_DRV, "device type %d \n", device_type); | |
561 | ||
562 | blkdev->device_id_len = buf[7]; | |
563 | if (blkdev->device_id_len > 64) | |
564 | blkdev->device_id_len = 64; | |
565 | ||
566 | memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); | |
04f50c4d | 567 | /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id, |
454f18a9 | 568 | * blkdev->device_id_len); */ |
f82bd046 HJ |
569 | |
570 | kunmap(page_buf); | |
571 | ||
572 | __free_page(page_buf); | |
573 | ||
574 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
454f18a9 | 579 | /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */ |
f82bd046 HJ |
580 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev) |
581 | { | |
8a280399 | 582 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
583 | struct page *page_buf; |
584 | unsigned char *buf; | |
585 | struct scsi_sense_hdr sense_hdr; | |
586 | ||
587 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n"); | |
588 | ||
589 | blkdev->sector_size = 0; | |
590 | blkdev->capacity = 0; | |
454f18a9 | 591 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
592 | |
593 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
594 | if (!blkvsc_req) | |
f82bd046 | 595 | return -ENOMEM; |
f82bd046 HJ |
596 | |
597 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
598 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 599 | if (!page_buf) { |
f82bd046 HJ |
600 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
601 | return -ENOMEM; | |
602 | } | |
603 | ||
604 | init_waitqueue_head(&blkvsc_req->wevent); | |
605 | blkvsc_req->dev = blkdev; | |
606 | blkvsc_req->req = NULL; | |
607 | blkvsc_req->write = 0; | |
608 | ||
609 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
610 | blkvsc_req->request.DataBuffer.Offset = 0; | |
611 | blkvsc_req->request.DataBuffer.Length = 8; | |
612 | ||
613 | blkvsc_req->cmnd[0] = READ_CAPACITY; | |
614 | blkvsc_req->cmd_len = 16; | |
615 | ||
454f18a9 BP |
616 | /* |
617 | * Set this here since the completion routine may be invoked | |
618 | * and completed before we return | |
619 | */ | |
8a280399 | 620 | blkvsc_req->cond = 0; |
f82bd046 HJ |
621 | |
622 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
623 | ||
8a280399 GKH |
624 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
625 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
626 | |
627 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
628 | ||
454f18a9 | 629 | /* check error */ |
8a280399 GKH |
630 | if (blkvsc_req->request.Status) { |
631 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
632 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
f82bd046 | 633 | |
8a280399 GKH |
634 | if (sense_hdr.asc == 0x3A) { |
635 | /* Medium not present */ | |
f82bd046 HJ |
636 | blkdev->media_not_present = 1; |
637 | } | |
f82bd046 HJ |
638 | return 0; |
639 | } | |
640 | buf = kmap(page_buf); | |
641 | ||
454f18a9 | 642 | /* be to le */ |
8a280399 GKH |
643 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | |
644 | (buf[2] << 8) | buf[3]) + 1; | |
645 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
646 | (buf[6] << 8) | buf[7]; | |
f82bd046 HJ |
647 | |
648 | kunmap(page_buf); | |
649 | ||
650 | __free_page(page_buf); | |
651 | ||
652 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
f82bd046 HJ |
657 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev) |
658 | { | |
8a280399 | 659 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
660 | struct page *page_buf; |
661 | unsigned char *buf; | |
662 | struct scsi_sense_hdr sense_hdr; | |
663 | ||
664 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n"); | |
665 | ||
666 | blkdev->sector_size = 0; | |
667 | blkdev->capacity = 0; | |
454f18a9 | 668 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
669 | |
670 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
671 | if (!blkvsc_req) | |
f82bd046 | 672 | return -ENOMEM; |
f82bd046 HJ |
673 | |
674 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
675 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 676 | if (!page_buf) { |
f82bd046 HJ |
677 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
678 | return -ENOMEM; | |
679 | } | |
680 | ||
681 | init_waitqueue_head(&blkvsc_req->wevent); | |
682 | blkvsc_req->dev = blkdev; | |
683 | blkvsc_req->req = NULL; | |
684 | blkvsc_req->write = 0; | |
685 | ||
686 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
687 | blkvsc_req->request.DataBuffer.Offset = 0; | |
688 | blkvsc_req->request.DataBuffer.Length = 12; | |
689 | ||
454f18a9 | 690 | blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */ |
f82bd046 HJ |
691 | blkvsc_req->cmd_len = 16; |
692 | ||
454f18a9 BP |
693 | /* |
694 | * Set this here since the completion routine may be invoked | |
695 | * and completed before we return | |
696 | */ | |
8a280399 | 697 | blkvsc_req->cond = 0; |
f82bd046 HJ |
698 | |
699 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
700 | ||
8a280399 GKH |
701 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
702 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
703 | |
704 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
705 | ||
454f18a9 | 706 | /* check error */ |
8a280399 GKH |
707 | if (blkvsc_req->request.Status) { |
708 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
709 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
710 | if (sense_hdr.asc == 0x3A) { | |
711 | /* Medium not present */ | |
f82bd046 HJ |
712 | blkdev->media_not_present = 1; |
713 | } | |
f82bd046 HJ |
714 | return 0; |
715 | } | |
716 | buf = kmap(page_buf); | |
717 | ||
454f18a9 | 718 | /* be to le */ |
8a280399 GKH |
719 | blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1; |
720 | blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]); | |
f82bd046 | 721 | |
8a280399 GKH |
722 | #if 0 |
723 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | | |
724 | (buf[2] << 8) | buf[3]) + 1; | |
725 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
726 | (buf[6] << 8) | buf[7]; | |
727 | #endif | |
f82bd046 HJ |
728 | |
729 | kunmap(page_buf); | |
730 | ||
731 | __free_page(page_buf); | |
732 | ||
733 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
8a280399 GKH |
738 | /** |
739 | * blkvsc_remove() - Callback when our device is removed | |
740 | */ | |
f82bd046 HJ |
741 | static int blkvsc_remove(struct device *device) |
742 | { | |
8a280399 GKH |
743 | struct driver_context *driver_ctx = |
744 | driver_to_driver_context(device->driver); | |
745 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
746 | (struct blkvsc_driver_context *)driver_ctx; | |
747 | struct storvsc_driver_object *storvsc_drv_obj = | |
748 | &blkvsc_drv_ctx->drv_obj; | |
f82bd046 | 749 | struct device_context *device_ctx = device_to_device_context(device); |
3d3b5518 | 750 | struct hv_device *device_obj = &device_ctx->device_obj; |
b57a68dc | 751 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 | 752 | unsigned long flags; |
8a280399 | 753 | int ret; |
f82bd046 HJ |
754 | |
755 | DPRINT_ENTER(BLKVSC_DRV); | |
756 | ||
757 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n"); | |
758 | ||
8a280399 | 759 | if (!storvsc_drv_obj->Base.OnDeviceRemove) { |
f82bd046 HJ |
760 | DPRINT_EXIT(BLKVSC_DRV); |
761 | return -1; | |
762 | } | |
763 | ||
8a280399 GKH |
764 | /* |
765 | * Call to the vsc driver to let it know that the device is being | |
766 | * removed | |
767 | */ | |
f82bd046 | 768 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
8a280399 | 769 | if (ret != 0) { |
454f18a9 | 770 | /* TODO: */ |
8a280399 GKH |
771 | DPRINT_ERR(BLKVSC_DRV, |
772 | "unable to remove blkvsc device (ret %d)", ret); | |
f82bd046 HJ |
773 | } |
774 | ||
454f18a9 | 775 | /* Get to a known state */ |
f82bd046 HJ |
776 | spin_lock_irqsave(&blkdev->lock, flags); |
777 | ||
778 | blkdev->shutting_down = 1; | |
779 | ||
780 | blk_stop_queue(blkdev->gd->queue); | |
781 | ||
782 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
783 | ||
8a280399 GKH |
784 | while (blkdev->num_outstanding_reqs) { |
785 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
786 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
787 | udelay(100); |
788 | } | |
789 | ||
790 | blkvsc_do_flush(blkdev); | |
791 | ||
792 | spin_lock_irqsave(&blkdev->lock, flags); | |
793 | ||
794 | blkvsc_cancel_pending_reqs(blkdev); | |
795 | ||
796 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
797 | ||
798 | blk_cleanup_queue(blkdev->gd->queue); | |
799 | ||
800 | del_gendisk(blkdev->gd); | |
801 | ||
802 | kmem_cache_destroy(blkdev->request_pool); | |
803 | ||
804 | kfree(blkdev); | |
805 | ||
806 | DPRINT_EXIT(BLKVSC_DRV); | |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
811 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) | |
812 | { | |
813 | ASSERT(blkvsc_req->req); | |
814 | ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); | |
815 | ||
816 | blkvsc_req->cmd_len = 16; | |
817 | ||
8a280399 GKH |
818 | if (blkvsc_req->sector_start > 0xffffffff) { |
819 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
820 | blkvsc_req->write = 1; |
821 | blkvsc_req->cmnd[0] = WRITE_16; | |
8a280399 | 822 | } else { |
f82bd046 HJ |
823 | blkvsc_req->write = 0; |
824 | blkvsc_req->cmnd[0] = READ_16; | |
825 | } | |
826 | ||
827 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
828 | ||
8a280399 GKH |
829 | *(unsigned long long *)&blkvsc_req->cmnd[2] = |
830 | cpu_to_be64(blkvsc_req->sector_start); | |
831 | *(unsigned int *)&blkvsc_req->cmnd[10] = | |
832 | cpu_to_be32(blkvsc_req->sector_count); | |
833 | } else if ((blkvsc_req->sector_count > 0xff) || | |
834 | (blkvsc_req->sector_start > 0x1fffff)) { | |
835 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
836 | blkvsc_req->write = 1; |
837 | blkvsc_req->cmnd[0] = WRITE_10; | |
8a280399 | 838 | } else { |
f82bd046 HJ |
839 | blkvsc_req->write = 0; |
840 | blkvsc_req->cmnd[0] = READ_10; | |
841 | } | |
842 | ||
843 | blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
844 | ||
8a280399 GKH |
845 | *(unsigned int *)&blkvsc_req->cmnd[2] = |
846 | cpu_to_be32(blkvsc_req->sector_start); | |
847 | *(unsigned short *)&blkvsc_req->cmnd[7] = | |
848 | cpu_to_be16(blkvsc_req->sector_count); | |
849 | } else { | |
850 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
851 | blkvsc_req->write = 1; |
852 | blkvsc_req->cmnd[0] = WRITE_6; | |
8a280399 | 853 | } else { |
f82bd046 HJ |
854 | blkvsc_req->write = 0; |
855 | blkvsc_req->cmnd[0] = READ_6; | |
856 | } | |
857 | ||
8a280399 GKH |
858 | *(unsigned int *)&blkvsc_req->cmnd[1] = |
859 | cpu_to_be32(blkvsc_req->sector_start) >> 8; | |
f82bd046 | 860 | blkvsc_req->cmnd[1] &= 0x1f; |
8a280399 | 861 | blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count; |
f82bd046 HJ |
862 | } |
863 | } | |
864 | ||
8a280399 GKH |
865 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, |
866 | void (*request_completion)(struct hv_storvsc_request *)) | |
f82bd046 HJ |
867 | { |
868 | struct block_device_context *blkdev = blkvsc_req->dev; | |
8a280399 GKH |
869 | struct device_context *device_ctx = blkdev->device_ctx; |
870 | struct driver_context *driver_ctx = | |
871 | driver_to_driver_context(device_ctx->device.driver); | |
872 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
873 | (struct blkvsc_driver_context *)driver_ctx; | |
874 | struct storvsc_driver_object *storvsc_drv_obj = | |
875 | &blkvsc_drv_ctx->drv_obj; | |
0b3f6834 | 876 | struct hv_storvsc_request *storvsc_req; |
8a280399 | 877 | int ret; |
f82bd046 | 878 | |
8a280399 GKH |
879 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " |
880 | "req %p type %s start_sector %lu count %ld offset %d " | |
881 | "len %d\n", blkvsc_req, | |
882 | (blkvsc_req->write) ? "WRITE" : "READ", | |
883 | (unsigned long) blkvsc_req->sector_start, | |
884 | blkvsc_req->sector_count, | |
885 | blkvsc_req->request.DataBuffer.Offset, | |
886 | blkvsc_req->request.DataBuffer.Length); | |
887 | #if 0 | |
888 | for (i = 0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++) { | |
889 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " | |
890 | "req %p pfn[%d] %llx\n", | |
891 | blkvsc_req, i, | |
892 | blkvsc_req->request.DataBuffer.PfnArray[i]); | |
893 | } | |
894 | #endif | |
f82bd046 HJ |
895 | |
896 | storvsc_req = &blkvsc_req->request; | |
8a280399 GKH |
897 | storvsc_req->Extension = (void *)((unsigned long)blkvsc_req + |
898 | sizeof(struct blkvsc_request)); | |
f82bd046 | 899 | |
8a280399 | 900 | storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; |
f82bd046 HJ |
901 | |
902 | storvsc_req->OnIOCompletion = request_completion; | |
903 | storvsc_req->Context = blkvsc_req; | |
904 | ||
905 | storvsc_req->Host = blkdev->port; | |
906 | storvsc_req->Bus = blkdev->path; | |
907 | storvsc_req->TargetId = blkdev->target; | |
454f18a9 | 908 | storvsc_req->LunId = 0; /* this is not really used at all */ |
f82bd046 HJ |
909 | |
910 | storvsc_req->CdbLen = blkvsc_req->cmd_len; | |
911 | storvsc_req->Cdb = blkvsc_req->cmnd; | |
912 | ||
913 | storvsc_req->SenseBuffer = blkvsc_req->sense_buffer; | |
914 | storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
915 | ||
8a280399 GKH |
916 | ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, |
917 | &blkvsc_req->request); | |
f82bd046 | 918 | if (ret == 0) |
f82bd046 | 919 | blkdev->num_outstanding_reqs++; |
f82bd046 HJ |
920 | |
921 | return ret; | |
922 | } | |
923 | ||
454f18a9 BP |
924 | /* |
925 | * We break the request into 1 or more blkvsc_requests and submit | |
926 | * them. If we cant submit them all, we put them on the | |
927 | * pending_list. The blkvsc_request() will work on the pending_list. | |
928 | */ | |
8a280399 GKH |
929 | static int blkvsc_do_request(struct block_device_context *blkdev, |
930 | struct request *req) | |
f82bd046 | 931 | { |
8a280399 GKH |
932 | struct bio *bio = NULL; |
933 | struct bio_vec *bvec = NULL; | |
934 | struct bio_vec *prev_bvec = NULL; | |
935 | struct blkvsc_request *blkvsc_req = NULL; | |
f82bd046 | 936 | struct blkvsc_request *tmp; |
8a280399 GKH |
937 | int databuf_idx = 0; |
938 | int seg_idx = 0; | |
f82bd046 HJ |
939 | sector_t start_sector; |
940 | unsigned long num_sectors = 0; | |
8a280399 GKH |
941 | int ret = 0; |
942 | int pending = 0; | |
943 | struct blkvsc_request_group *group = NULL; | |
f82bd046 | 944 | |
8a280399 GKH |
945 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu \n", blkdev, req, |
946 | (unsigned long)blk_rq_pos(req)); | |
f82bd046 | 947 | |
454f18a9 | 948 | /* Create a group to tie req to list of blkvsc_reqs */ |
8a280399 | 949 | group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); |
f82bd046 | 950 | if (!group) |
f82bd046 | 951 | return -ENOMEM; |
f82bd046 HJ |
952 | |
953 | INIT_LIST_HEAD(&group->blkvsc_req_list); | |
954 | group->outstanding = group->status = 0; | |
955 | ||
0fce4c2f | 956 | start_sector = blk_rq_pos(req); |
f82bd046 | 957 | |
454f18a9 | 958 | /* foreach bio in the request */ |
8a280399 GKH |
959 | if (req->bio) { |
960 | for (bio = req->bio; bio; bio = bio->bi_next) { | |
961 | /* | |
962 | * Map this bio into an existing or new storvsc request | |
963 | */ | |
964 | bio_for_each_segment(bvec, bio, seg_idx) { | |
965 | DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() " | |
966 | "- req %p bio %p bvec %p seg_idx %d " | |
967 | "databuf_idx %d\n", req, bio, bvec, | |
968 | seg_idx, databuf_idx); | |
969 | ||
970 | /* Get a new storvsc request */ | |
971 | /* 1st-time */ | |
972 | if ((!blkvsc_req) || | |
973 | (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) | |
974 | /* hole at the begin of page */ | |
975 | || (bvec->bv_offset != 0) || | |
976 | /* hold at the end of page */ | |
977 | (prev_bvec && | |
978 | (prev_bvec->bv_len != PAGE_SIZE))) { | |
979 | /* submit the prev one */ | |
980 | if (blkvsc_req) { | |
981 | blkvsc_req->sector_start = start_sector; | |
982 | sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
983 | ||
984 | blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
985 | blkvsc_init_rw(blkvsc_req); | |
f82bd046 HJ |
986 | } |
987 | ||
8a280399 GKH |
988 | /* |
989 | * Create new blkvsc_req to represent | |
990 | * the current bvec | |
991 | */ | |
992 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
993 | if (!blkvsc_req) { | |
994 | /* free up everything */ | |
995 | list_for_each_entry_safe( | |
996 | blkvsc_req, tmp, | |
997 | &group->blkvsc_req_list, | |
998 | req_entry) { | |
999 | list_del(&blkvsc_req->req_entry); | |
1000 | kmem_cache_free(blkdev->request_pool, blkvsc_req); | |
1001 | } | |
1002 | ||
1003 | kmem_cache_free(blkdev->request_pool, group); | |
1004 | return -ENOMEM; | |
1005 | } | |
f82bd046 | 1006 | |
8a280399 GKH |
1007 | memset(blkvsc_req, 0, |
1008 | sizeof(struct blkvsc_request)); | |
f82bd046 | 1009 | |
8a280399 GKH |
1010 | blkvsc_req->dev = blkdev; |
1011 | blkvsc_req->req = req; | |
1012 | blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset; | |
1013 | blkvsc_req->request.DataBuffer.Length = 0; | |
f82bd046 | 1014 | |
8a280399 GKH |
1015 | /* Add to the group */ |
1016 | blkvsc_req->group = group; | |
1017 | blkvsc_req->group->outstanding++; | |
1018 | list_add_tail(&blkvsc_req->req_entry, | |
1019 | &blkvsc_req->group->blkvsc_req_list); | |
f82bd046 | 1020 | |
8a280399 GKH |
1021 | start_sector += num_sectors; |
1022 | num_sectors = 0; | |
1023 | databuf_idx = 0; | |
1024 | } | |
f82bd046 | 1025 | |
8a280399 GKH |
1026 | /* Add the curr bvec/segment to the curr blkvsc_req */ |
1027 | blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page); | |
1028 | blkvsc_req->request.DataBuffer.Length += bvec->bv_len; | |
f82bd046 | 1029 | |
8a280399 | 1030 | prev_bvec = bvec; |
f82bd046 | 1031 | |
8a280399 GKH |
1032 | databuf_idx++; |
1033 | num_sectors += bvec->bv_len >> 9; | |
f82bd046 | 1034 | |
8a280399 | 1035 | } /* bio_for_each_segment */ |
f82bd046 | 1036 | |
8a280399 GKH |
1037 | } /* rq_for_each_bio */ |
1038 | } | |
f82bd046 | 1039 | |
454f18a9 | 1040 | /* Handle the last one */ |
8a280399 GKH |
1041 | if (blkvsc_req) { |
1042 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n", | |
1043 | blkdev, req, blkvsc_req->group, | |
1044 | blkvsc_req->group->outstanding); | |
f82bd046 HJ |
1045 | |
1046 | blkvsc_req->sector_start = start_sector; | |
8a280399 GKH |
1047 | sector_div(blkvsc_req->sector_start, |
1048 | (blkdev->sector_size >> 9)); | |
f82bd046 | 1049 | |
8a280399 GKH |
1050 | blkvsc_req->sector_count = num_sectors / |
1051 | (blkdev->sector_size >> 9); | |
f82bd046 HJ |
1052 | |
1053 | blkvsc_init_rw(blkvsc_req); | |
1054 | } | |
1055 | ||
8a280399 GKH |
1056 | list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { |
1057 | if (pending) { | |
1058 | DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to " | |
1059 | "pending_list - blkvsc_req %p start_sect %lu" | |
1060 | " sect_count %ld (%lu %ld)\n", blkvsc_req, | |
1061 | (unsigned long)blkvsc_req->sector_start, | |
1062 | blkvsc_req->sector_count, | |
1063 | (unsigned long)start_sector, | |
1064 | (unsigned long)num_sectors); | |
1065 | ||
1066 | list_add_tail(&blkvsc_req->pend_entry, | |
1067 | &blkdev->pending_list); | |
1068 | } else { | |
1069 | ret = blkvsc_submit_request(blkvsc_req, | |
1070 | blkvsc_request_completion); | |
1071 | if (ret == -1) { | |
f82bd046 | 1072 | pending = 1; |
8a280399 GKH |
1073 | list_add_tail(&blkvsc_req->pend_entry, |
1074 | &blkdev->pending_list); | |
f82bd046 HJ |
1075 | } |
1076 | ||
8a280399 GKH |
1077 | DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p " |
1078 | "start_sect %lu sect_count %ld (%lu %ld) " | |
1079 | "ret %d\n", blkvsc_req, | |
1080 | (unsigned long)blkvsc_req->sector_start, | |
1081 | blkvsc_req->sector_count, | |
1082 | (unsigned long)start_sector, | |
1083 | num_sectors, ret); | |
f82bd046 HJ |
1084 | } |
1085 | } | |
1086 | ||
1087 | return pending; | |
1088 | } | |
1089 | ||
0b3f6834 | 1090 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request) |
f82bd046 | 1091 | { |
8a280399 GKH |
1092 | struct blkvsc_request *blkvsc_req = |
1093 | (struct blkvsc_request *)request->Context; | |
1094 | struct block_device_context *blkdev = | |
1095 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1096 | struct scsi_sense_hdr sense_hdr; |
1097 | ||
8a280399 GKH |
1098 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", |
1099 | blkvsc_req); | |
f82bd046 HJ |
1100 | |
1101 | blkdev->num_outstanding_reqs--; | |
1102 | ||
1103 | if (blkvsc_req->request.Status) | |
8a280399 GKH |
1104 | if (scsi_normalize_sense(blkvsc_req->sense_buffer, |
1105 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
f82bd046 | 1106 | scsi_print_sense_hdr("blkvsc", &sense_hdr); |
f82bd046 | 1107 | |
8a280399 | 1108 | blkvsc_req->cond = 1; |
f82bd046 HJ |
1109 | wake_up_interruptible(&blkvsc_req->wevent); |
1110 | } | |
1111 | ||
0b3f6834 | 1112 | static void blkvsc_request_completion(struct hv_storvsc_request *request) |
f82bd046 | 1113 | { |
8a280399 GKH |
1114 | struct blkvsc_request *blkvsc_req = |
1115 | (struct blkvsc_request *)request->Context; | |
1116 | struct block_device_context *blkdev = | |
1117 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1118 | unsigned long flags; |
1119 | struct blkvsc_request *comp_req, *tmp; | |
1120 | ||
1121 | ASSERT(blkvsc_req->group); | |
1122 | ||
8a280399 GKH |
1123 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s " |
1124 | "sect_start %lu sect_count %ld len %d group outstd %d " | |
1125 | "total outstd %d\n", | |
1126 | blkdev, blkvsc_req, blkvsc_req->group, | |
1127 | (blkvsc_req->write) ? "WRITE" : "READ", | |
1128 | (unsigned long)blkvsc_req->sector_start, | |
1129 | blkvsc_req->sector_count, | |
1130 | blkvsc_req->request.DataBuffer.Length, | |
1131 | blkvsc_req->group->outstanding, | |
1132 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
1133 | |
1134 | spin_lock_irqsave(&blkdev->lock, flags); | |
1135 | ||
1136 | blkdev->num_outstanding_reqs--; | |
1137 | blkvsc_req->group->outstanding--; | |
1138 | ||
454f18a9 BP |
1139 | /* |
1140 | * Only start processing when all the blkvsc_reqs are | |
1141 | * completed. This guarantees no out-of-order blkvsc_req | |
1142 | * completion when calling end_that_request_first() | |
1143 | */ | |
8a280399 GKH |
1144 | if (blkvsc_req->group->outstanding == 0) { |
1145 | list_for_each_entry_safe(comp_req, tmp, | |
1146 | &blkvsc_req->group->blkvsc_req_list, | |
1147 | req_entry) { | |
1148 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1149 | "sect_start %lu sect_count %ld \n", | |
1150 | comp_req, | |
1151 | (unsigned long)comp_req->sector_start, | |
1152 | comp_req->sector_count); | |
f82bd046 HJ |
1153 | |
1154 | list_del(&comp_req->req_entry); | |
1155 | ||
8a280399 GKH |
1156 | if (!__blk_end_request(comp_req->req, |
1157 | (!comp_req->request.Status ? 0 : -EIO), | |
1158 | comp_req->sector_count * blkdev->sector_size)) { | |
1159 | /* | |
1160 | * All the sectors have been xferred ie the | |
1161 | * request is done | |
1162 | */ | |
1163 | DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", | |
1164 | comp_req->req); | |
1165 | kmem_cache_free(blkdev->request_pool, | |
1166 | comp_req->group); | |
f82bd046 | 1167 | } |
f82bd046 HJ |
1168 | |
1169 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1170 | } | |
1171 | ||
8a280399 | 1172 | if (!blkdev->shutting_down) { |
f82bd046 HJ |
1173 | blkvsc_do_pending_reqs(blkdev); |
1174 | blk_start_queue(blkdev->gd->queue); | |
1175 | blkvsc_request(blkdev->gd->queue); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
1180 | } | |
1181 | ||
1182 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) | |
1183 | { | |
1184 | struct blkvsc_request *pend_req, *tmp; | |
1185 | struct blkvsc_request *comp_req, *tmp2; | |
1186 | ||
8a280399 | 1187 | int ret = 0; |
f82bd046 HJ |
1188 | |
1189 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()"); | |
1190 | ||
454f18a9 | 1191 | /* Flush the pending list first */ |
8a280399 GKH |
1192 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1193 | pend_entry) { | |
454f18a9 BP |
1194 | /* |
1195 | * The pend_req could be part of a partially completed | |
1196 | * request. If so, complete those req first until we | |
1197 | * hit the pend_req | |
1198 | */ | |
8a280399 GKH |
1199 | list_for_each_entry_safe(comp_req, tmp2, |
1200 | &pend_req->group->blkvsc_req_list, | |
1201 | req_entry) { | |
1202 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
1203 | "sect_start %lu sect_count %ld \n", | |
1204 | comp_req, | |
1205 | (unsigned long) comp_req->sector_start, | |
1206 | comp_req->sector_count); | |
f82bd046 HJ |
1207 | |
1208 | if (comp_req == pend_req) | |
1209 | break; | |
1210 | ||
1211 | list_del(&comp_req->req_entry); | |
1212 | ||
8a280399 GKH |
1213 | if (comp_req->req) { |
1214 | ret = __blk_end_request(comp_req->req, | |
1215 | (!comp_req->request.Status ? 0 : -EIO), | |
1216 | comp_req->sector_count * | |
1217 | blkdev->sector_size); | |
1218 | ASSERT(ret != 0); | |
f82bd046 HJ |
1219 | } |
1220 | ||
1221 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1222 | } | |
1223 | ||
8a280399 GKH |
1224 | DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n", |
1225 | pend_req); | |
f82bd046 HJ |
1226 | |
1227 | list_del(&pend_req->pend_entry); | |
1228 | ||
1229 | list_del(&pend_req->req_entry); | |
1230 | ||
8a280399 GKH |
1231 | if (comp_req->req) { |
1232 | if (!__blk_end_request(pend_req->req, -EIO, | |
1233 | pend_req->sector_count * | |
1234 | blkdev->sector_size)) { | |
1235 | /* | |
1236 | * All the sectors have been xferred ie the | |
1237 | * request is done | |
1238 | */ | |
1239 | DPRINT_DBG(BLKVSC_DRV, | |
1240 | "blkvsc_cancel_pending_reqs() - " | |
1241 | "req %p COMPLETED\n", pend_req->req); | |
1242 | kmem_cache_free(blkdev->request_pool, | |
1243 | pend_req->group); | |
1244 | } | |
f82bd046 HJ |
1245 | } |
1246 | ||
1247 | kmem_cache_free(blkdev->request_pool, pend_req); | |
1248 | } | |
1249 | ||
1250 | return ret; | |
1251 | } | |
1252 | ||
1253 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) | |
1254 | { | |
1255 | struct blkvsc_request *pend_req, *tmp; | |
8a280399 | 1256 | int ret = 0; |
f82bd046 | 1257 | |
454f18a9 | 1258 | /* Flush the pending list first */ |
8a280399 GKH |
1259 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1260 | pend_entry) { | |
1261 | DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", | |
1262 | pend_req); | |
f82bd046 | 1263 | |
8a280399 GKH |
1264 | ret = blkvsc_submit_request(pend_req, |
1265 | blkvsc_request_completion); | |
f82bd046 | 1266 | if (ret != 0) |
f82bd046 | 1267 | break; |
f82bd046 | 1268 | else |
f82bd046 | 1269 | list_del(&pend_req->pend_entry); |
f82bd046 HJ |
1270 | } |
1271 | ||
1272 | return ret; | |
1273 | } | |
1274 | ||
1275 | static void blkvsc_request(struct request_queue *queue) | |
1276 | { | |
1277 | struct block_device_context *blkdev = NULL; | |
1278 | struct request *req; | |
8a280399 | 1279 | int ret = 0; |
f82bd046 HJ |
1280 | |
1281 | DPRINT_DBG(BLKVSC_DRV, "- enter \n"); | |
8a280399 | 1282 | while ((req = blk_peek_request(queue)) != NULL) { |
f82bd046 HJ |
1283 | DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req); |
1284 | ||
1285 | blkdev = req->rq_disk->private_data; | |
8a280399 GKH |
1286 | if (blkdev->shutting_down || !blk_fs_request(req) || |
1287 | blkdev->media_not_present) { | |
0fce4c2f | 1288 | __blk_end_request_cur(req, 0); |
f82bd046 HJ |
1289 | continue; |
1290 | } | |
1291 | ||
1292 | ret = blkvsc_do_pending_reqs(blkdev); | |
1293 | ||
8a280399 GKH |
1294 | if (ret != 0) { |
1295 | DPRINT_DBG(BLKVSC_DRV, | |
1296 | "- stop queue - pending_list not empty\n"); | |
f82bd046 HJ |
1297 | blk_stop_queue(queue); |
1298 | break; | |
1299 | } | |
1300 | ||
0fce4c2f | 1301 | blk_start_request(req); |
f82bd046 HJ |
1302 | |
1303 | ret = blkvsc_do_request(blkdev, req); | |
8a280399 | 1304 | if (ret > 0) { |
f82bd046 HJ |
1305 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n"); |
1306 | blk_stop_queue(queue); | |
1307 | break; | |
8a280399 | 1308 | } else if (ret < 0) { |
f82bd046 HJ |
1309 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n"); |
1310 | blk_requeue_request(queue, req); | |
1311 | blk_stop_queue(queue); | |
1312 | break; | |
1313 | } | |
1314 | } | |
1315 | } | |
1316 | ||
8a280399 | 1317 | static int blkvsc_open(struct block_device *bdev, fmode_t mode) |
f82bd046 | 1318 | { |
39635f7d | 1319 | struct block_device_context *blkdev = bdev->bd_disk->private_data; |
f82bd046 | 1320 | |
8a280399 GKH |
1321 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1322 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1323 | |
1324 | spin_lock(&blkdev->lock); | |
1325 | ||
8a280399 | 1326 | if (!blkdev->users && blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1327 | spin_unlock(&blkdev->lock); |
39635f7d | 1328 | check_disk_change(bdev); |
f82bd046 HJ |
1329 | spin_lock(&blkdev->lock); |
1330 | } | |
1331 | ||
1332 | blkdev->users++; | |
1333 | ||
1334 | spin_unlock(&blkdev->lock); | |
1335 | return 0; | |
1336 | } | |
1337 | ||
77d2d9da | 1338 | static int blkvsc_release(struct gendisk *disk, fmode_t mode) |
f82bd046 | 1339 | { |
77d2d9da | 1340 | struct block_device_context *blkdev = disk->private_data; |
f82bd046 | 1341 | |
8a280399 GKH |
1342 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1343 | blkdev->gd->disk_name); | |
f82bd046 HJ |
1344 | |
1345 | spin_lock(&blkdev->lock); | |
8a280399 | 1346 | if (blkdev->users == 1) { |
f82bd046 HJ |
1347 | spin_unlock(&blkdev->lock); |
1348 | blkvsc_do_flush(blkdev); | |
1349 | spin_lock(&blkdev->lock); | |
1350 | } | |
1351 | ||
1352 | blkdev->users--; | |
1353 | ||
1354 | spin_unlock(&blkdev->lock); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static int blkvsc_media_changed(struct gendisk *gd) | |
1359 | { | |
1360 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
f82bd046 HJ |
1361 | return 1; |
1362 | } | |
1363 | ||
1364 | static int blkvsc_revalidate_disk(struct gendisk *gd) | |
1365 | { | |
1366 | struct block_device_context *blkdev = gd->private_data; | |
1367 | ||
1368 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1369 | ||
8a280399 | 1370 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1371 | blkvsc_do_read_capacity(blkdev); |
8a280399 GKH |
1372 | set_capacity(blkdev->gd, blkdev->capacity * |
1373 | (blkdev->sector_size/512)); | |
0fce4c2f | 1374 | blk_queue_logical_block_size(gd->queue, blkdev->sector_size); |
f82bd046 HJ |
1375 | } |
1376 | return 0; | |
1377 | } | |
1378 | ||
bd1de709 | 1379 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) |
f82bd046 HJ |
1380 | { |
1381 | sector_t total_sectors = get_capacity(bd->bd_disk); | |
8a280399 GKH |
1382 | sector_t cylinder_times_heads = 0; |
1383 | sector_t temp = 0; | |
f82bd046 | 1384 | |
8a280399 GKH |
1385 | int sectors_per_track = 0; |
1386 | int heads = 0; | |
1387 | int cylinders = 0; | |
1388 | int rem = 0; | |
f82bd046 | 1389 | |
8a280399 GKH |
1390 | if (total_sectors > (65535 * 16 * 255)) |
1391 | total_sectors = (65535 * 16 * 255); | |
f82bd046 | 1392 | |
8a280399 GKH |
1393 | if (total_sectors >= (65535 * 16 * 63)) { |
1394 | sectors_per_track = 255; | |
1395 | heads = 16; | |
f82bd046 HJ |
1396 | |
1397 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1398 | /* sector_div stores the quotient in cylinder_times_heads */ |
1399 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
1400 | } else { | |
1401 | sectors_per_track = 17; | |
f82bd046 HJ |
1402 | |
1403 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1404 | /* sector_div stores the quotient in cylinder_times_heads */ |
1405 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
f82bd046 HJ |
1406 | |
1407 | temp = cylinder_times_heads + 1023; | |
8a280399 GKH |
1408 | /* sector_div stores the quotient in temp */ |
1409 | rem = sector_div(temp, 1024); | |
f82bd046 HJ |
1410 | |
1411 | heads = temp; | |
1412 | ||
8a280399 GKH |
1413 | if (heads < 4) |
1414 | heads = 4; | |
1415 | ||
f82bd046 | 1416 | |
8a280399 GKH |
1417 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
1418 | sectors_per_track = 31; | |
1419 | heads = 16; | |
f82bd046 HJ |
1420 | |
1421 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1422 | /* |
1423 | * sector_div stores the quotient in | |
1424 | * cylinder_times_heads | |
1425 | */ | |
1426 | rem = sector_div(cylinder_times_heads, | |
1427 | sectors_per_track); | |
1428 | } | |
f82bd046 | 1429 | |
8a280399 GKH |
1430 | if (cylinder_times_heads >= (heads * 1024)) { |
1431 | sectors_per_track = 63; | |
1432 | heads = 16; | |
f82bd046 HJ |
1433 | |
1434 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1435 | /* |
1436 | * sector_div stores the quotient in | |
1437 | * cylinder_times_heads | |
1438 | */ | |
1439 | rem = sector_div(cylinder_times_heads, | |
1440 | sectors_per_track); | |
1441 | } | |
454f18a9 | 1442 | } |
f82bd046 HJ |
1443 | |
1444 | temp = cylinder_times_heads; | |
8a280399 GKH |
1445 | /* sector_div stores the quotient in temp */ |
1446 | rem = sector_div(temp, heads); | |
f82bd046 HJ |
1447 | cylinders = temp; |
1448 | ||
1449 | hg->heads = heads; | |
8a280399 GKH |
1450 | hg->sectors = sectors_per_track; |
1451 | hg->cylinders = cylinders; | |
f82bd046 | 1452 | |
8a280399 GKH |
1453 | DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1454 | sectors_per_track); | |
f82bd046 HJ |
1455 | |
1456 | return 0; | |
1457 | } | |
1458 | ||
dfe8b2d9 BP |
1459 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
1460 | unsigned cmd, unsigned long argument) | |
f82bd046 | 1461 | { |
b5788529 | 1462 | /* struct block_device_context *blkdev = bd->bd_disk->private_data; */ |
8a280399 | 1463 | int ret; |
f82bd046 | 1464 | |
8a280399 GKH |
1465 | switch (cmd) { |
1466 | /* | |
1467 | * TODO: I think there is certain format for HDIO_GET_IDENTITY rather | |
1468 | * than just a GUID. Commented it out for now. | |
1469 | */ | |
1470 | #if 0 | |
1471 | case HDIO_GET_IDENTITY: | |
f82bd046 | 1472 | DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); |
8a280399 GKH |
1473 | if (copy_to_user((void __user *)arg, blkdev->device_id, |
1474 | blkdev->device_id_len)) | |
f82bd046 | 1475 | ret = -EFAULT; |
8a280399 GKH |
1476 | break; |
1477 | #endif | |
f82bd046 HJ |
1478 | default: |
1479 | ret = -EINVAL; | |
1480 | break; | |
1481 | } | |
1482 | ||
1483 | return ret; | |
1484 | } | |
1485 | ||
f82bd046 HJ |
1486 | static int __init blkvsc_init(void) |
1487 | { | |
1488 | int ret; | |
1489 | ||
454f18a9 | 1490 | ASSERT(sizeof(sector_t) == 8); /* Make sure CONFIG_LBD is set */ |
f82bd046 HJ |
1491 | |
1492 | DPRINT_ENTER(BLKVSC_DRV); | |
1493 | ||
1494 | DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing...."); | |
1495 | ||
1496 | ret = blkvsc_drv_init(BlkVscInitialize); | |
1497 | ||
1498 | DPRINT_EXIT(BLKVSC_DRV); | |
1499 | ||
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | static void __exit blkvsc_exit(void) | |
1504 | { | |
1505 | DPRINT_ENTER(BLKVSC_DRV); | |
f82bd046 | 1506 | blkvsc_drv_exit(); |
f82bd046 HJ |
1507 | DPRINT_ENTER(BLKVSC_DRV); |
1508 | } | |
1509 | ||
8a280399 | 1510 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1511 | MODULE_VERSION(HV_DRV_VERSION); |
f82bd046 | 1512 | module_param(blkvsc_ringbuffer_size, int, S_IRUGO); |
f82bd046 HJ |
1513 | module_init(blkvsc_init); |
1514 | module_exit(blkvsc_exit); |