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Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / hv / blkvsc_drv.c
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
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>
28 #include <linux/slab.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_dbg.h>
33 #include "osd.h"
34 #include "logging.h"
35 #include "version_info.h"
36 #include "vmbus.h"
37 #include "storvsc_api.h"
38
39
40 #define BLKVSC_MINORS 64
41
42 enum blkvsc_device_type {
43 UNKNOWN_DEV_TYPE,
44 HARDDISK_TYPE,
45 DVD_TYPE,
46 };
47
48 /*
49 * This request ties the struct request and struct
50 * blkvsc_request/hv_storvsc_request together A struct request may be
51 * represented by 1 or more struct blkvsc_request
52 */
53 struct blkvsc_request_group {
54 int outstanding;
55 int status;
56 struct list_head blkvsc_req_list; /* list of blkvsc_requests */
57 };
58
59 struct blkvsc_request {
60 /* blkvsc_request_group.blkvsc_req_list */
61 struct list_head req_entry;
62
63 /* block_device_context.pending_list */
64 struct list_head pend_entry;
65
66 /* This may be null if we generate a request internally */
67 struct request *req;
68
69 struct block_device_context *dev;
70
71 /* The group this request is part of. Maybe null */
72 struct blkvsc_request_group *group;
73
74 wait_queue_head_t wevent;
75 int cond;
76
77 int write;
78 sector_t sector_start;
79 unsigned long sector_count;
80
81 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
82 unsigned char cmd_len;
83 unsigned char cmnd[MAX_COMMAND_SIZE];
84
85 struct hv_storvsc_request request;
86 /*
87 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
88 * because - The extension buffer falls right here and is pointed to by
89 * request.Extension;
90 * Which sounds like a horrible idea, who designed this?
91 */
92 };
93
94 /* Per device structure */
95 struct block_device_context {
96 /* point back to our device context */
97 struct vm_device *device_ctx;
98 struct kmem_cache *request_pool;
99 spinlock_t lock;
100 struct gendisk *gd;
101 enum blkvsc_device_type device_type;
102 struct list_head pending_list;
103
104 unsigned char device_id[64];
105 unsigned int device_id_len;
106 int num_outstanding_reqs;
107 int shutting_down;
108 int media_not_present;
109 unsigned int sector_size;
110 sector_t capacity;
111 unsigned int port;
112 unsigned char path;
113 unsigned char target;
114 int users;
115 };
116
117 /* Per driver */
118 struct blkvsc_driver_context {
119 /* !! These must be the first 2 fields !! */
120 /* FIXME this is a bug! */
121 struct driver_context drv_ctx;
122 struct storvsc_driver_object drv_obj;
123 };
124
125 /* Static decl */
126 static int blkvsc_probe(struct device *dev);
127 static int blkvsc_remove(struct device *device);
128 static void blkvsc_shutdown(struct device *device);
129
130 static int blkvsc_open(struct block_device *bdev, fmode_t mode);
131 static int blkvsc_release(struct gendisk *disk, fmode_t mode);
132 static int blkvsc_media_changed(struct gendisk *gd);
133 static int blkvsc_revalidate_disk(struct gendisk *gd);
134 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
135 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
136 unsigned cmd, unsigned long argument);
137 static void blkvsc_request(struct request_queue *queue);
138 static void blkvsc_request_completion(struct hv_storvsc_request *request);
139 static int blkvsc_do_request(struct block_device_context *blkdev,
140 struct request *req);
141 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
142 void (*request_completion)(struct hv_storvsc_request *));
143 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
144 static void blkvsc_cmd_completion(struct hv_storvsc_request *request);
145 static int blkvsc_do_inquiry(struct block_device_context *blkdev);
146 static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
147 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
148 static int blkvsc_do_flush(struct block_device_context *blkdev);
149 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
150 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
151
152 static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
153 module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
154 MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
155
156 /* The one and only one */
157 static struct blkvsc_driver_context g_blkvsc_drv;
158
159 static const struct block_device_operations block_ops = {
160 .owner = THIS_MODULE,
161 .open = blkvsc_open,
162 .release = blkvsc_release,
163 .media_changed = blkvsc_media_changed,
164 .revalidate_disk = blkvsc_revalidate_disk,
165 .getgeo = blkvsc_getgeo,
166 .ioctl = blkvsc_ioctl,
167 };
168
169 /*
170 * blkvsc_drv_init - BlkVsc driver initialization.
171 */
172 static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
173 {
174 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj;
175 struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx;
176 int ret;
177
178 DPRINT_ENTER(BLKVSC_DRV);
179
180 vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
181
182 storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size;
183
184 /* Callback to client driver to complete the initialization */
185 drv_init(&storvsc_drv_obj->Base);
186
187 drv_ctx->driver.name = storvsc_drv_obj->Base.name;
188 memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType,
189 sizeof(struct hv_guid));
190
191 drv_ctx->probe = blkvsc_probe;
192 drv_ctx->remove = blkvsc_remove;
193 drv_ctx->shutdown = blkvsc_shutdown;
194
195 /* The driver belongs to vmbus */
196 ret = vmbus_child_driver_register(drv_ctx);
197
198 DPRINT_EXIT(BLKVSC_DRV);
199
200 return ret;
201 }
202
203 static int blkvsc_drv_exit_cb(struct device *dev, void *data)
204 {
205 struct device **curr = (struct device **)data;
206 *curr = dev;
207 return 1; /* stop iterating */
208 }
209
210 static void blkvsc_drv_exit(void)
211 {
212 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj;
213 struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx;
214 struct device *current_dev;
215 int ret;
216
217 DPRINT_ENTER(BLKVSC_DRV);
218
219 while (1) {
220 current_dev = NULL;
221
222 /* Get the device */
223 ret = driver_for_each_device(&drv_ctx->driver, NULL,
224 (void *) &current_dev,
225 blkvsc_drv_exit_cb);
226
227 if (ret)
228 DPRINT_WARN(BLKVSC_DRV,
229 "driver_for_each_device returned %d", ret);
230
231
232 if (current_dev == NULL)
233 break;
234
235 /* Initiate removal from the top-down */
236 device_unregister(current_dev);
237 }
238
239 if (storvsc_drv_obj->Base.OnCleanup)
240 storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
241
242 vmbus_child_driver_unregister(drv_ctx);
243
244 DPRINT_EXIT(BLKVSC_DRV);
245
246 return;
247 }
248
249 /*
250 * blkvsc_probe - Add a new device for this driver
251 */
252 static int blkvsc_probe(struct device *device)
253 {
254 struct driver_context *driver_ctx =
255 driver_to_driver_context(device->driver);
256 struct blkvsc_driver_context *blkvsc_drv_ctx =
257 (struct blkvsc_driver_context *)driver_ctx;
258 struct storvsc_driver_object *storvsc_drv_obj =
259 &blkvsc_drv_ctx->drv_obj;
260 struct vm_device *device_ctx = device_to_vm_device(device);
261 struct hv_device *device_obj = &device_ctx->device_obj;
262
263 struct block_device_context *blkdev = NULL;
264 struct storvsc_device_info device_info;
265 int major = 0;
266 int devnum = 0;
267 int ret = 0;
268 static int ide0_registered;
269 static int ide1_registered;
270
271 DPRINT_ENTER(BLKVSC_DRV);
272
273 DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
274
275 if (!storvsc_drv_obj->Base.OnDeviceAdd) {
276 DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
277 ret = -1;
278 goto Cleanup;
279 }
280
281 blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
282 if (!blkdev) {
283 ret = -ENOMEM;
284 goto Cleanup;
285 }
286
287 INIT_LIST_HEAD(&blkdev->pending_list);
288
289 /* Initialize what we can here */
290 spin_lock_init(&blkdev->lock);
291
292 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
293 /* sizeof(struct blkvsc_request)); */
294
295 blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device),
296 sizeof(struct blkvsc_request) +
297 storvsc_drv_obj->RequestExtSize, 0,
298 SLAB_HWCACHE_ALIGN, NULL);
299 if (!blkdev->request_pool) {
300 ret = -ENOMEM;
301 goto Cleanup;
302 }
303
304
305 /* Call to the vsc driver to add the device */
306 ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info);
307 if (ret != 0) {
308 DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
309 goto Cleanup;
310 }
311
312 blkdev->device_ctx = device_ctx;
313 /* this identified the device 0 or 1 */
314 blkdev->target = device_info.TargetId;
315 /* this identified the ide ctrl 0 or 1 */
316 blkdev->path = device_info.PathId;
317
318 dev_set_drvdata(device, blkdev);
319
320 /* Calculate the major and device num */
321 if (blkdev->path == 0) {
322 major = IDE0_MAJOR;
323 devnum = blkdev->path + blkdev->target; /* 0 or 1 */
324
325 if (!ide0_registered) {
326 ret = register_blkdev(major, "ide");
327 if (ret != 0) {
328 DPRINT_ERR(BLKVSC_DRV,
329 "register_blkdev() failed! ret %d",
330 ret);
331 goto Remove;
332 }
333
334 ide0_registered = 1;
335 }
336 } else if (blkdev->path == 1) {
337 major = IDE1_MAJOR;
338 devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */
339
340 if (!ide1_registered) {
341 ret = register_blkdev(major, "ide");
342 if (ret != 0) {
343 DPRINT_ERR(BLKVSC_DRV,
344 "register_blkdev() failed! ret %d",
345 ret);
346 goto Remove;
347 }
348
349 ide1_registered = 1;
350 }
351 } else {
352 DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
353 ret = -1;
354 goto Cleanup;
355 }
356
357 DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
358
359 blkdev->gd = alloc_disk(BLKVSC_MINORS);
360 if (!blkdev->gd) {
361 DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
362 ret = -1;
363 goto Cleanup;
364 }
365
366 blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
367
368 blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
369 blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
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;
381 sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
382
383 blkvsc_do_inquiry(blkdev);
384 if (blkdev->device_type == DVD_TYPE) {
385 set_disk_ro(blkdev->gd, 1);
386 blkdev->gd->flags |= GENHD_FL_REMOVABLE;
387 blkvsc_do_read_capacity(blkdev);
388 } else {
389 blkvsc_do_read_capacity16(blkdev);
390 }
391
392 set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
393 blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
394 /* go! */
395 add_disk(blkdev->gd);
396
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);
400
401 return ret;
402
403 Remove:
404 storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
405
406 Cleanup:
407 if (blkdev) {
408 if (blkdev->request_pool) {
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 {
423 struct block_device_context *blkdev = dev_get_drvdata(device);
424 unsigned long flags;
425
426 if (!blkdev)
427 return;
428
429 DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
430 blkdev->users, blkdev->gd->disk_name);
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
440 while (blkdev->num_outstanding_reqs) {
441 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
442 blkdev->num_outstanding_reqs);
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 {
457 struct blkvsc_request *blkvsc_req;
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)
466 return -ENOMEM;
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
481 /*
482 * Set this here since the completion routine may be invoked and
483 * completed before we return
484 */
485 blkvsc_req->cond = 0;
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
495 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
496 static int blkvsc_do_inquiry(struct block_device_context *blkdev)
497 {
498 struct blkvsc_request *blkvsc_req;
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)
507 return -ENOMEM;
508
509 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
510 page_buf = alloc_page(GFP_KERNEL);
511 if (!page_buf) {
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;
526 blkvsc_req->cmnd[1] = 0x1; /* Get product data */
527 blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */
528 blkvsc_req->cmnd[4] = 64;
529 blkvsc_req->cmd_len = 6;
530
531 /*
532 * Set this here since the completion routine may be invoked and
533 * completed before we return
534 */
535 blkvsc_req->cond = 0;
536
537 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
538
539 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
540 blkvsc_req, blkvsc_req->cond);
541
542 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
543
544 buf = kmap(page_buf);
545
546 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
547 /* be to le */
548 device_type = buf[0] & 0x1F;
549
550 if (device_type == 0x0) {
551 blkdev->device_type = HARDDISK_TYPE;
552 } else if (device_type == 0x5) {
553 blkdev->device_type = DVD_TYPE;
554 } else {
555 /* TODO: this is currently unsupported device type */
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);
566 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
567 * blkdev->device_id_len); */
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
578 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
579 static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
580 {
581 struct blkvsc_request *blkvsc_req;
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;
590 blkdev->media_not_present = 0; /* assume a disk is present */
591
592 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
593 if (!blkvsc_req)
594 return -ENOMEM;
595
596 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
597 page_buf = alloc_page(GFP_KERNEL);
598 if (!page_buf) {
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
615 /*
616 * Set this here since the completion routine may be invoked
617 * and completed before we return
618 */
619 blkvsc_req->cond = 0;
620
621 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
622
623 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
624 blkvsc_req, blkvsc_req->cond);
625
626 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
627
628 /* check error */
629 if (blkvsc_req->request.Status) {
630 scsi_normalize_sense(blkvsc_req->sense_buffer,
631 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
632
633 if (sense_hdr.asc == 0x3A) {
634 /* Medium not present */
635 blkdev->media_not_present = 1;
636 }
637 return 0;
638 }
639 buf = kmap(page_buf);
640
641 /* be to le */
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];
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
656 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
657 {
658 struct blkvsc_request *blkvsc_req;
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;
667 blkdev->media_not_present = 0; /* assume a disk is present */
668
669 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
670 if (!blkvsc_req)
671 return -ENOMEM;
672
673 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
674 page_buf = alloc_page(GFP_KERNEL);
675 if (!page_buf) {
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
689 blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */
690 blkvsc_req->cmd_len = 16;
691
692 /*
693 * Set this here since the completion routine may be invoked
694 * and completed before we return
695 */
696 blkvsc_req->cond = 0;
697
698 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
699
700 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
701 blkvsc_req, blkvsc_req->cond);
702
703 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
704
705 /* check error */
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 */
711 blkdev->media_not_present = 1;
712 }
713 return 0;
714 }
715 buf = kmap(page_buf);
716
717 /* be to le */
718 blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1;
719 blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]);
720
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
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
737 /*
738 * blkvsc_remove() - Callback when our device is removed
739 */
740 static int blkvsc_remove(struct device *device)
741 {
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;
748 struct vm_device *device_ctx = device_to_vm_device(device);
749 struct hv_device *device_obj = &device_ctx->device_obj;
750 struct block_device_context *blkdev = dev_get_drvdata(device);
751 unsigned long flags;
752 int ret;
753
754 DPRINT_ENTER(BLKVSC_DRV);
755
756 DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
757
758 if (!storvsc_drv_obj->Base.OnDeviceRemove) {
759 DPRINT_EXIT(BLKVSC_DRV);
760 return -1;
761 }
762
763 /*
764 * Call to the vsc driver to let it know that the device is being
765 * removed
766 */
767 ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
768 if (ret != 0) {
769 /* TODO: */
770 DPRINT_ERR(BLKVSC_DRV,
771 "unable to remove blkvsc device (ret %d)", ret);
772 }
773
774 /* Get to a known state */
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
783 while (blkdev->num_outstanding_reqs) {
784 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
785 blkdev->num_outstanding_reqs);
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
817 if (blkvsc_req->sector_start > 0xffffffff) {
818 if (rq_data_dir(blkvsc_req->req)) {
819 blkvsc_req->write = 1;
820 blkvsc_req->cmnd[0] = WRITE_16;
821 } else {
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
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)) {
835 blkvsc_req->write = 1;
836 blkvsc_req->cmnd[0] = WRITE_10;
837 } else {
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
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)) {
850 blkvsc_req->write = 1;
851 blkvsc_req->cmnd[0] = WRITE_6;
852 } else {
853 blkvsc_req->write = 0;
854 blkvsc_req->cmnd[0] = READ_6;
855 }
856
857 *(unsigned int *)&blkvsc_req->cmnd[1] =
858 cpu_to_be32(blkvsc_req->sector_start) >> 8;
859 blkvsc_req->cmnd[1] &= 0x1f;
860 blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count;
861 }
862 }
863
864 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
865 void (*request_completion)(struct hv_storvsc_request *))
866 {
867 struct block_device_context *blkdev = blkvsc_req->dev;
868 struct vm_device *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;
875 struct hv_storvsc_request *storvsc_req;
876 int ret;
877
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
894
895 storvsc_req = &blkvsc_req->request;
896 storvsc_req->Extension = (void *)((unsigned long)blkvsc_req +
897 sizeof(struct blkvsc_request));
898
899 storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
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;
907 storvsc_req->LunId = 0; /* this is not really used at all */
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
915 ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj,
916 &blkvsc_req->request);
917 if (ret == 0)
918 blkdev->num_outstanding_reqs++;
919
920 return ret;
921 }
922
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 */
928 static int blkvsc_do_request(struct block_device_context *blkdev,
929 struct request *req)
930 {
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;
935 struct blkvsc_request *tmp;
936 int databuf_idx = 0;
937 int seg_idx = 0;
938 sector_t start_sector;
939 unsigned long num_sectors = 0;
940 int ret = 0;
941 int pending = 0;
942 struct blkvsc_request_group *group = NULL;
943
944 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req,
945 (unsigned long)blk_rq_pos(req));
946
947 /* Create a group to tie req to list of blkvsc_reqs */
948 group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
949 if (!group)
950 return -ENOMEM;
951
952 INIT_LIST_HEAD(&group->blkvsc_req_list);
953 group->outstanding = group->status = 0;
954
955 start_sector = blk_rq_pos(req);
956
957 /* foreach bio in the request */
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);
985 }
986
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 }
1005
1006 memset(blkvsc_req, 0,
1007 sizeof(struct blkvsc_request));
1008
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;
1013
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);
1019
1020 start_sector += num_sectors;
1021 num_sectors = 0;
1022 databuf_idx = 0;
1023 }
1024
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;
1028
1029 prev_bvec = bvec;
1030
1031 databuf_idx++;
1032 num_sectors += bvec->bv_len >> 9;
1033
1034 } /* bio_for_each_segment */
1035
1036 } /* rq_for_each_bio */
1037 }
1038
1039 /* Handle the last one */
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);
1044
1045 blkvsc_req->sector_start = start_sector;
1046 sector_div(blkvsc_req->sector_start,
1047 (blkdev->sector_size >> 9));
1048
1049 blkvsc_req->sector_count = num_sectors /
1050 (blkdev->sector_size >> 9);
1051
1052 blkvsc_init_rw(blkvsc_req);
1053 }
1054
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) {
1071 pending = 1;
1072 list_add_tail(&blkvsc_req->pend_entry,
1073 &blkdev->pending_list);
1074 }
1075
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);
1083 }
1084 }
1085
1086 return pending;
1087 }
1088
1089 static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
1090 {
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;
1095 struct scsi_sense_hdr sense_hdr;
1096
1097 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n",
1098 blkvsc_req);
1099
1100 blkdev->num_outstanding_reqs--;
1101
1102 if (blkvsc_req->request.Status)
1103 if (scsi_normalize_sense(blkvsc_req->sense_buffer,
1104 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1105 scsi_print_sense_hdr("blkvsc", &sense_hdr);
1106
1107 blkvsc_req->cond = 1;
1108 wake_up_interruptible(&blkvsc_req->wevent);
1109 }
1110
1111 static void blkvsc_request_completion(struct hv_storvsc_request *request)
1112 {
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;
1117 unsigned long flags;
1118 struct blkvsc_request *comp_req, *tmp;
1119
1120 /* ASSERT(blkvsc_req->group); */
1121
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);
1132
1133 spin_lock_irqsave(&blkdev->lock, flags);
1134
1135 blkdev->num_outstanding_reqs--;
1136 blkvsc_req->group->outstanding--;
1137
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 */
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);
1152
1153 list_del(&comp_req->req_entry);
1154
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);
1166 }
1167
1168 kmem_cache_free(blkdev->request_pool, comp_req);
1169 }
1170
1171 if (!blkdev->shutting_down) {
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
1186 int ret = 0;
1187
1188 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()");
1189
1190 /* Flush the pending list first */
1191 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1192 pend_entry) {
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 */
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);
1206
1207 if (comp_req == pend_req)
1208 break;
1209
1210 list_del(&comp_req->req_entry);
1211
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
1218 /* FIXME: shouldn't this do more than return? */
1219 if (ret)
1220 goto out;
1221 }
1222
1223 kmem_cache_free(blkdev->request_pool, comp_req);
1224 }
1225
1226 DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n",
1227 pend_req);
1228
1229 list_del(&pend_req->pend_entry);
1230
1231 list_del(&pend_req->req_entry);
1232
1233 if (comp_req->req) {
1234 if (!__blk_end_request(pend_req->req, -EIO,
1235 pend_req->sector_count *
1236 blkdev->sector_size)) {
1237 /*
1238 * All the sectors have been xferred ie the
1239 * request is done
1240 */
1241 DPRINT_DBG(BLKVSC_DRV,
1242 "blkvsc_cancel_pending_reqs() - "
1243 "req %p COMPLETED\n", pend_req->req);
1244 kmem_cache_free(blkdev->request_pool,
1245 pend_req->group);
1246 }
1247 }
1248
1249 kmem_cache_free(blkdev->request_pool, pend_req);
1250 }
1251
1252 out:
1253 return ret;
1254 }
1255
1256 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
1257 {
1258 struct blkvsc_request *pend_req, *tmp;
1259 int ret = 0;
1260
1261 /* Flush the pending list first */
1262 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1263 pend_entry) {
1264 DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n",
1265 pend_req);
1266
1267 ret = blkvsc_submit_request(pend_req,
1268 blkvsc_request_completion);
1269 if (ret != 0)
1270 break;
1271 else
1272 list_del(&pend_req->pend_entry);
1273 }
1274
1275 return ret;
1276 }
1277
1278 static void blkvsc_request(struct request_queue *queue)
1279 {
1280 struct block_device_context *blkdev = NULL;
1281 struct request *req;
1282 int ret = 0;
1283
1284 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1285 while ((req = blk_peek_request(queue)) != NULL) {
1286 DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
1287
1288 blkdev = req->rq_disk->private_data;
1289 if (blkdev->shutting_down || !blk_fs_request(req) ||
1290 blkdev->media_not_present) {
1291 __blk_end_request_cur(req, 0);
1292 continue;
1293 }
1294
1295 ret = blkvsc_do_pending_reqs(blkdev);
1296
1297 if (ret != 0) {
1298 DPRINT_DBG(BLKVSC_DRV,
1299 "- stop queue - pending_list not empty\n");
1300 blk_stop_queue(queue);
1301 break;
1302 }
1303
1304 blk_start_request(req);
1305
1306 ret = blkvsc_do_request(blkdev, req);
1307 if (ret > 0) {
1308 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n");
1309 blk_stop_queue(queue);
1310 break;
1311 } else if (ret < 0) {
1312 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n");
1313 blk_requeue_request(queue, req);
1314 blk_stop_queue(queue);
1315 break;
1316 }
1317 }
1318 }
1319
1320 static int blkvsc_open(struct block_device *bdev, fmode_t mode)
1321 {
1322 struct block_device_context *blkdev = bdev->bd_disk->private_data;
1323
1324 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1325 blkdev->gd->disk_name);
1326
1327 spin_lock(&blkdev->lock);
1328
1329 if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
1330 spin_unlock(&blkdev->lock);
1331 check_disk_change(bdev);
1332 spin_lock(&blkdev->lock);
1333 }
1334
1335 blkdev->users++;
1336
1337 spin_unlock(&blkdev->lock);
1338 return 0;
1339 }
1340
1341 static int blkvsc_release(struct gendisk *disk, fmode_t mode)
1342 {
1343 struct block_device_context *blkdev = disk->private_data;
1344
1345 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1346 blkdev->gd->disk_name);
1347
1348 spin_lock(&blkdev->lock);
1349 if (blkdev->users == 1) {
1350 spin_unlock(&blkdev->lock);
1351 blkvsc_do_flush(blkdev);
1352 spin_lock(&blkdev->lock);
1353 }
1354
1355 blkdev->users--;
1356
1357 spin_unlock(&blkdev->lock);
1358 return 0;
1359 }
1360
1361 static int blkvsc_media_changed(struct gendisk *gd)
1362 {
1363 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1364 return 1;
1365 }
1366
1367 static int blkvsc_revalidate_disk(struct gendisk *gd)
1368 {
1369 struct block_device_context *blkdev = gd->private_data;
1370
1371 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1372
1373 if (blkdev->device_type == DVD_TYPE) {
1374 blkvsc_do_read_capacity(blkdev);
1375 set_capacity(blkdev->gd, blkdev->capacity *
1376 (blkdev->sector_size/512));
1377 blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
1378 }
1379 return 0;
1380 }
1381
1382 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
1383 {
1384 sector_t total_sectors = get_capacity(bd->bd_disk);
1385 sector_t cylinder_times_heads = 0;
1386 sector_t temp = 0;
1387
1388 int sectors_per_track = 0;
1389 int heads = 0;
1390 int cylinders = 0;
1391 int rem = 0;
1392
1393 if (total_sectors > (65535 * 16 * 255))
1394 total_sectors = (65535 * 16 * 255);
1395
1396 if (total_sectors >= (65535 * 16 * 63)) {
1397 sectors_per_track = 255;
1398 heads = 16;
1399
1400 cylinder_times_heads = total_sectors;
1401 /* sector_div stores the quotient in cylinder_times_heads */
1402 rem = sector_div(cylinder_times_heads, sectors_per_track);
1403 } else {
1404 sectors_per_track = 17;
1405
1406 cylinder_times_heads = total_sectors;
1407 /* sector_div stores the quotient in cylinder_times_heads */
1408 rem = sector_div(cylinder_times_heads, sectors_per_track);
1409
1410 temp = cylinder_times_heads + 1023;
1411 /* sector_div stores the quotient in temp */
1412 rem = sector_div(temp, 1024);
1413
1414 heads = temp;
1415
1416 if (heads < 4)
1417 heads = 4;
1418
1419
1420 if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
1421 sectors_per_track = 31;
1422 heads = 16;
1423
1424 cylinder_times_heads = total_sectors;
1425 /*
1426 * sector_div stores the quotient in
1427 * cylinder_times_heads
1428 */
1429 rem = sector_div(cylinder_times_heads,
1430 sectors_per_track);
1431 }
1432
1433 if (cylinder_times_heads >= (heads * 1024)) {
1434 sectors_per_track = 63;
1435 heads = 16;
1436
1437 cylinder_times_heads = total_sectors;
1438 /*
1439 * sector_div stores the quotient in
1440 * cylinder_times_heads
1441 */
1442 rem = sector_div(cylinder_times_heads,
1443 sectors_per_track);
1444 }
1445 }
1446
1447 temp = cylinder_times_heads;
1448 /* sector_div stores the quotient in temp */
1449 rem = sector_div(temp, heads);
1450 cylinders = temp;
1451
1452 hg->heads = heads;
1453 hg->sectors = sectors_per_track;
1454 hg->cylinders = cylinders;
1455
1456 DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
1457 sectors_per_track);
1458
1459 return 0;
1460 }
1461
1462 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
1463 unsigned cmd, unsigned long argument)
1464 {
1465 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1466 int ret;
1467
1468 switch (cmd) {
1469 /*
1470 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1471 * than just a GUID. Commented it out for now.
1472 */
1473 #if 0
1474 case HDIO_GET_IDENTITY:
1475 DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n");
1476 if (copy_to_user((void __user *)arg, blkdev->device_id,
1477 blkdev->device_id_len))
1478 ret = -EFAULT;
1479 break;
1480 #endif
1481 default:
1482 ret = -EINVAL;
1483 break;
1484 }
1485
1486 return ret;
1487 }
1488
1489 static int __init blkvsc_init(void)
1490 {
1491 int ret;
1492
1493 BUILD_BUG_ON(sizeof(sector_t) != 8);
1494
1495 DPRINT_ENTER(BLKVSC_DRV);
1496
1497 DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
1498
1499 ret = blkvsc_drv_init(BlkVscInitialize);
1500
1501 DPRINT_EXIT(BLKVSC_DRV);
1502
1503 return ret;
1504 }
1505
1506 static void __exit blkvsc_exit(void)
1507 {
1508 DPRINT_ENTER(BLKVSC_DRV);
1509 blkvsc_drv_exit();
1510 DPRINT_ENTER(BLKVSC_DRV);
1511 }
1512
1513 MODULE_LICENSE("GPL");
1514 MODULE_VERSION(HV_DRV_VERSION);
1515 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1516 module_init(blkvsc_init);
1517 module_exit(blkvsc_exit);
kernel source for telekom puls (alcatel/mediatek)