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