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Staging: hv: Get rid of the host field from struct hv_storvsc_request
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / hv / blkvsc_drv.c
blob243eede9bbdbd3d69e17b203f655290e14b0551f
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 "hv_api.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
89 /* Per device structure */
90 struct block_device_context {
91 /* point back to our device context */
92 struct hv_device *device_ctx;
93 struct kmem_cache *request_pool;
94 spinlock_t lock;
95 struct gendisk *gd;
96 enum blkvsc_device_type device_type;
97 struct list_head pending_list;
98
99 unsigned char device_id[64];
100 unsigned int device_id_len;
101 int num_outstanding_reqs;
102 int shutting_down;
103 int media_not_present;
104 unsigned int sector_size;
105 sector_t capacity;
106 unsigned int port;
107 unsigned char path;
108 unsigned char target;
109 int users;
110 };
111
112
113 static const char *g_blk_driver_name = "blkvsc";
114
115 /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
116 static const struct hv_guid g_blk_device_type = {
117 .data = {
118 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
119 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
120 }
121 };
122
123 static int blk_vsc_on_device_add(struct hv_device *device,
124 void *additional_info)
125 {
126 struct storvsc_device_info *device_info;
127 int ret = 0;
128
129 device_info = (struct storvsc_device_info *)additional_info;
130
131 ret = stor_vsc_on_device_add(device, additional_info);
132 if (ret != 0)
133 return ret;
134
135 /*
136 * We need to use the device instance guid to set the path and target
137 * id. For IDE devices, the device instance id is formatted as
138 * <bus id> * - <device id> - 8899 - 000000000000.
139 */
140 device_info->path_id = device->dev_instance.data[3] << 24 |
141 device->dev_instance.data[2] << 16 |
142 device->dev_instance.data[1] << 8 |
143 device->dev_instance.data[0];
144
145 device_info->target_id = device->dev_instance.data[5] << 8 |
146 device->dev_instance.data[4];
147
148 return ret;
149 }
150
151
152 static int blk_vsc_initialize(struct hv_driver *driver)
153 {
154 struct storvsc_driver_object *stor_driver;
155 int ret = 0;
156
157 stor_driver = hvdr_to_stordr(driver);
158
159 /* Make sure we are at least 2 pages since 1 page is used for control */
160 /* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
161
162 driver->name = g_blk_driver_name;
163 memcpy(&driver->dev_type, &g_blk_device_type, sizeof(struct hv_guid));
164
165
166 /*
167 * Divide the ring buffer data size (which is 1 page less than the ring
168 * buffer size since that page is reserved for the ring buffer indices)
169 * by the max request size (which is
170 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
171 */
172 stor_driver->max_outstanding_req_per_channel =
173 ((stor_driver->ring_buffer_size - PAGE_SIZE) /
174 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
175 sizeof(struct vstor_packet) + sizeof(u64),
176 sizeof(u64)));
177
178 DPRINT_INFO(BLKVSC, "max io outstd %u",
179 stor_driver->max_outstanding_req_per_channel);
180
181 /* Setup the dispatch table */
182 stor_driver->base.dev_add = blk_vsc_on_device_add;
183 stor_driver->base.dev_rm = stor_vsc_on_device_remove;
184 stor_driver->base.cleanup = stor_vsc_on_cleanup;
185 stor_driver->on_io_request = stor_vsc_on_io_request;
186
187 return ret;
188 }
189
190 /* Static decl */
191 static DEFINE_MUTEX(blkvsc_mutex);
192 static int blkvsc_probe(struct device *dev);
193 static int blkvsc_remove(struct device *device);
194 static void blkvsc_shutdown(struct device *device);
195
196 static int blkvsc_open(struct block_device *bdev, fmode_t mode);
197 static int blkvsc_release(struct gendisk *disk, fmode_t mode);
198 static unsigned int blkvsc_check_events(struct gendisk *gd,
199 unsigned int clearing);
200 static int blkvsc_revalidate_disk(struct gendisk *gd);
201 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
202 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
203 unsigned cmd, unsigned long argument);
204 static void blkvsc_request(struct request_queue *queue);
205 static void blkvsc_request_completion(struct hv_storvsc_request *request);
206 static int blkvsc_do_request(struct block_device_context *blkdev,
207 struct request *req);
208 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
209 void (*request_completion)(struct hv_storvsc_request *));
210 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
211 static void blkvsc_cmd_completion(struct hv_storvsc_request *request);
212 static int blkvsc_do_inquiry(struct block_device_context *blkdev);
213 static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
214 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
215 static int blkvsc_do_flush(struct block_device_context *blkdev);
216 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
217 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
218
219 static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
220 module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
221 MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
222
223 /* The one and only one */
224 static struct storvsc_driver_object g_blkvsc_drv;
225
226 static const struct block_device_operations block_ops = {
227 .owner = THIS_MODULE,
228 .open = blkvsc_open,
229 .release = blkvsc_release,
230 .check_events = blkvsc_check_events,
231 .revalidate_disk = blkvsc_revalidate_disk,
232 .getgeo = blkvsc_getgeo,
233 .ioctl = blkvsc_ioctl,
234 };
235
236 /*
237 * blkvsc_drv_init - BlkVsc driver initialization.
238 */
239 static int blkvsc_drv_init(void)
240 {
241 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv;
242 struct hv_driver *drv = &g_blkvsc_drv.base;
243 int ret;
244
245 storvsc_drv_obj->ring_buffer_size = blkvsc_ringbuffer_size;
246
247 drv->priv = storvsc_drv_obj;
248
249 /* Callback to client driver to complete the initialization */
250 blk_vsc_initialize(&storvsc_drv_obj->base);
251
252 drv->driver.name = storvsc_drv_obj->base.name;
253
254 drv->driver.probe = blkvsc_probe;
255 drv->driver.remove = blkvsc_remove;
256 drv->driver.shutdown = blkvsc_shutdown;
257
258 /* The driver belongs to vmbus */
259 ret = vmbus_child_driver_register(&drv->driver);
260
261 return ret;
262 }
263
264 static int blkvsc_drv_exit_cb(struct device *dev, void *data)
265 {
266 struct device **curr = (struct device **)data;
267 *curr = dev;
268 return 1; /* stop iterating */
269 }
270
271 static void blkvsc_drv_exit(void)
272 {
273 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv;
274 struct hv_driver *drv = &g_blkvsc_drv.base;
275 struct device *current_dev;
276 int ret;
277
278 while (1) {
279 current_dev = NULL;
280
281 /* Get the device */
282 ret = driver_for_each_device(&drv->driver, NULL,
283 (void *) &current_dev,
284 blkvsc_drv_exit_cb);
285
286 if (ret)
287 DPRINT_WARN(BLKVSC_DRV,
288 "driver_for_each_device returned %d", ret);
289
290
291 if (current_dev == NULL)
292 break;
293
294 /* Initiate removal from the top-down */
295 device_unregister(current_dev);
296 }
297
298 if (storvsc_drv_obj->base.cleanup)
299 storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base);
300
301 vmbus_child_driver_unregister(&drv->driver);
302
303 return;
304 }
305
306 /*
307 * blkvsc_probe - Add a new device for this driver
308 */
309 static int blkvsc_probe(struct device *device)
310 {
311 struct hv_driver *drv =
312 drv_to_hv_drv(device->driver);
313 struct storvsc_driver_object *storvsc_drv_obj =
314 drv->priv;
315 struct hv_device *device_obj = device_to_hv_device(device);
316
317 struct block_device_context *blkdev = NULL;
318 struct storvsc_device_info device_info;
319 int major = 0;
320 int devnum = 0;
321 int ret = 0;
322 static int ide0_registered;
323 static int ide1_registered;
324
325 DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
326
327 if (!storvsc_drv_obj->base.dev_add) {
328 DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
329 ret = -1;
330 goto Cleanup;
331 }
332
333 blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
334 if (!blkdev) {
335 ret = -ENOMEM;
336 goto Cleanup;
337 }
338
339 INIT_LIST_HEAD(&blkdev->pending_list);
340
341 /* Initialize what we can here */
342 spin_lock_init(&blkdev->lock);
343
344 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
345 /* sizeof(struct blkvsc_request)); */
346
347 blkdev->request_pool = kmem_cache_create(dev_name(&device_obj->device),
348 sizeof(struct blkvsc_request), 0,
349 SLAB_HWCACHE_ALIGN, NULL);
350 if (!blkdev->request_pool) {
351 ret = -ENOMEM;
352 goto Cleanup;
353 }
354
355
356 /* Call to the vsc driver to add the device */
357 ret = storvsc_drv_obj->base.dev_add(device_obj, &device_info);
358 if (ret != 0) {
359 DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
360 goto Cleanup;
361 }
362
363 blkdev->device_ctx = device_obj;
364 /* this identified the device 0 or 1 */
365 blkdev->target = device_info.target_id;
366 /* this identified the ide ctrl 0 or 1 */
367 blkdev->path = device_info.path_id;
368
369 dev_set_drvdata(device, blkdev);
370
371 /* Calculate the major and device num */
372 if (blkdev->path == 0) {
373 major = IDE0_MAJOR;
374 devnum = blkdev->path + blkdev->target; /* 0 or 1 */
375
376 if (!ide0_registered) {
377 ret = register_blkdev(major, "ide");
378 if (ret != 0) {
379 DPRINT_ERR(BLKVSC_DRV,
380 "register_blkdev() failed! ret %d",
381 ret);
382 goto Remove;
383 }
384
385 ide0_registered = 1;
386 }
387 } else if (blkdev->path == 1) {
388 major = IDE1_MAJOR;
389 devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */
390
391 if (!ide1_registered) {
392 ret = register_blkdev(major, "ide");
393 if (ret != 0) {
394 DPRINT_ERR(BLKVSC_DRV,
395 "register_blkdev() failed! ret %d",
396 ret);
397 goto Remove;
398 }
399
400 ide1_registered = 1;
401 }
402 } else {
403 DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
404 ret = -1;
405 goto Cleanup;
406 }
407
408 DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
409
410 blkdev->gd = alloc_disk(BLKVSC_MINORS);
411 if (!blkdev->gd) {
412 DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
413 ret = -1;
414 goto Cleanup;
415 }
416
417 blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
418
419 blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
420 blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
421 blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
422 blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
423 blk_queue_dma_alignment(blkdev->gd->queue, 511);
424
425 blkdev->gd->major = major;
426 if (devnum == 1 || devnum == 3)
427 blkdev->gd->first_minor = BLKVSC_MINORS;
428 else
429 blkdev->gd->first_minor = 0;
430 blkdev->gd->fops = &block_ops;
431 blkdev->gd->events = DISK_EVENT_MEDIA_CHANGE;
432 blkdev->gd->private_data = blkdev;
433 blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
434 sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
435
436 blkvsc_do_inquiry(blkdev);
437 if (blkdev->device_type == DVD_TYPE) {
438 set_disk_ro(blkdev->gd, 1);
439 blkdev->gd->flags |= GENHD_FL_REMOVABLE;
440 blkvsc_do_read_capacity(blkdev);
441 } else {
442 blkvsc_do_read_capacity16(blkdev);
443 }
444
445 set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
446 blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
447 /* go! */
448 add_disk(blkdev->gd);
449
450 DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d",
451 blkdev->gd->disk_name, (unsigned long)blkdev->capacity,
452 blkdev->sector_size);
453
454 return ret;
455
456 Remove:
457 storvsc_drv_obj->base.dev_rm(device_obj);
458
459 Cleanup:
460 if (blkdev) {
461 if (blkdev->request_pool) {
462 kmem_cache_destroy(blkdev->request_pool);
463 blkdev->request_pool = NULL;
464 }
465 kfree(blkdev);
466 blkdev = NULL;
467 }
468
469 return ret;
470 }
471
472 static void blkvsc_shutdown(struct device *device)
473 {
474 struct block_device_context *blkdev = dev_get_drvdata(device);
475 unsigned long flags;
476
477 if (!blkdev)
478 return;
479
480 DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
481 blkdev->users, blkdev->gd->disk_name);
482
483 spin_lock_irqsave(&blkdev->lock, flags);
484
485 blkdev->shutting_down = 1;
486
487 blk_stop_queue(blkdev->gd->queue);
488
489 spin_unlock_irqrestore(&blkdev->lock, flags);
490
491 while (blkdev->num_outstanding_reqs) {
492 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
493 blkdev->num_outstanding_reqs);
494 udelay(100);
495 }
496
497 blkvsc_do_flush(blkdev);
498
499 spin_lock_irqsave(&blkdev->lock, flags);
500
501 blkvsc_cancel_pending_reqs(blkdev);
502
503 spin_unlock_irqrestore(&blkdev->lock, flags);
504 }
505
506 static int blkvsc_do_flush(struct block_device_context *blkdev)
507 {
508 struct blkvsc_request *blkvsc_req;
509
510 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
511
512 if (blkdev->device_type != HARDDISK_TYPE)
513 return 0;
514
515 blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
516 if (!blkvsc_req)
517 return -ENOMEM;
518
519 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
520 init_waitqueue_head(&blkvsc_req->wevent);
521 blkvsc_req->dev = blkdev;
522 blkvsc_req->req = NULL;
523 blkvsc_req->write = 0;
524
525 blkvsc_req->request.data_buffer.pfn_array[0] = 0;
526 blkvsc_req->request.data_buffer.offset = 0;
527 blkvsc_req->request.data_buffer.len = 0;
528
529 blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
530 blkvsc_req->cmd_len = 10;
531
532 /*
533 * Set this here since the completion routine may be invoked and
534 * completed before we return
535 */
536 blkvsc_req->cond = 0;
537 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
538
539 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
540
541 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
542
543 return 0;
544 }
545
546 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
547 static int blkvsc_do_inquiry(struct block_device_context *blkdev)
548 {
549 struct blkvsc_request *blkvsc_req;
550 struct page *page_buf;
551 unsigned char *buf;
552 unsigned char device_type;
553
554 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
555
556 blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
557 if (!blkvsc_req)
558 return -ENOMEM;
559
560 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
561 page_buf = alloc_page(GFP_KERNEL);
562 if (!page_buf) {
563 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
564 return -ENOMEM;
565 }
566
567 init_waitqueue_head(&blkvsc_req->wevent);
568 blkvsc_req->dev = blkdev;
569 blkvsc_req->req = NULL;
570 blkvsc_req->write = 0;
571
572 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
573 blkvsc_req->request.data_buffer.offset = 0;
574 blkvsc_req->request.data_buffer.len = 64;
575
576 blkvsc_req->cmnd[0] = INQUIRY;
577 blkvsc_req->cmnd[1] = 0x1; /* Get product data */
578 blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */
579 blkvsc_req->cmnd[4] = 64;
580 blkvsc_req->cmd_len = 6;
581
582 /*
583 * Set this here since the completion routine may be invoked and
584 * completed before we return
585 */
586 blkvsc_req->cond = 0;
587
588 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
589
590 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
591 blkvsc_req, blkvsc_req->cond);
592
593 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
594
595 buf = kmap(page_buf);
596
597 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
598 /* be to le */
599 device_type = buf[0] & 0x1F;
600
601 if (device_type == 0x0) {
602 blkdev->device_type = HARDDISK_TYPE;
603 } else if (device_type == 0x5) {
604 blkdev->device_type = DVD_TYPE;
605 } else {
606 /* TODO: this is currently unsupported device type */
607 blkdev->device_type = UNKNOWN_DEV_TYPE;
608 }
609
610 DPRINT_DBG(BLKVSC_DRV, "device type %d\n", device_type);
611
612 blkdev->device_id_len = buf[7];
613 if (blkdev->device_id_len > 64)
614 blkdev->device_id_len = 64;
615
616 memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
617 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
618 * blkdev->device_id_len); */
619
620 kunmap(page_buf);
621
622 __free_page(page_buf);
623
624 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
625
626 return 0;
627 }
628
629 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
630 static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
631 {
632 struct blkvsc_request *blkvsc_req;
633 struct page *page_buf;
634 unsigned char *buf;
635 struct scsi_sense_hdr sense_hdr;
636
637 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n");
638
639 blkdev->sector_size = 0;
640 blkdev->capacity = 0;
641 blkdev->media_not_present = 0; /* assume a disk is present */
642
643 blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
644 if (!blkvsc_req)
645 return -ENOMEM;
646
647 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
648 page_buf = alloc_page(GFP_KERNEL);
649 if (!page_buf) {
650 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
651 return -ENOMEM;
652 }
653
654 init_waitqueue_head(&blkvsc_req->wevent);
655 blkvsc_req->dev = blkdev;
656 blkvsc_req->req = NULL;
657 blkvsc_req->write = 0;
658
659 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
660 blkvsc_req->request.data_buffer.offset = 0;
661 blkvsc_req->request.data_buffer.len = 8;
662
663 blkvsc_req->cmnd[0] = READ_CAPACITY;
664 blkvsc_req->cmd_len = 16;
665
666 /*
667 * Set this here since the completion routine may be invoked
668 * and completed before we return
669 */
670 blkvsc_req->cond = 0;
671
672 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
673
674 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
675 blkvsc_req, blkvsc_req->cond);
676
677 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
678
679 /* check error */
680 if (blkvsc_req->request.status) {
681 scsi_normalize_sense(blkvsc_req->sense_buffer,
682 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
683
684 if (sense_hdr.asc == 0x3A) {
685 /* Medium not present */
686 blkdev->media_not_present = 1;
687 }
688 return 0;
689 }
690 buf = kmap(page_buf);
691
692 /* be to le */
693 blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
694 (buf[2] << 8) | buf[3]) + 1;
695 blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
696 (buf[6] << 8) | buf[7];
697
698 kunmap(page_buf);
699
700 __free_page(page_buf);
701
702 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
703
704 return 0;
705 }
706
707 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
708 {
709 struct blkvsc_request *blkvsc_req;
710 struct page *page_buf;
711 unsigned char *buf;
712 struct scsi_sense_hdr sense_hdr;
713
714 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n");
715
716 blkdev->sector_size = 0;
717 blkdev->capacity = 0;
718 blkdev->media_not_present = 0; /* assume a disk is present */
719
720 blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
721 if (!blkvsc_req)
722 return -ENOMEM;
723
724 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
725 page_buf = alloc_page(GFP_KERNEL);
726 if (!page_buf) {
727 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
728 return -ENOMEM;
729 }
730
731 init_waitqueue_head(&blkvsc_req->wevent);
732 blkvsc_req->dev = blkdev;
733 blkvsc_req->req = NULL;
734 blkvsc_req->write = 0;
735
736 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
737 blkvsc_req->request.data_buffer.offset = 0;
738 blkvsc_req->request.data_buffer.len = 12;
739
740 blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */
741 blkvsc_req->cmd_len = 16;
742
743 /*
744 * Set this here since the completion routine may be invoked
745 * and completed before we return
746 */
747 blkvsc_req->cond = 0;
748
749 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
750
751 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
752 blkvsc_req, blkvsc_req->cond);
753
754 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
755
756 /* check error */
757 if (blkvsc_req->request.status) {
758 scsi_normalize_sense(blkvsc_req->sense_buffer,
759 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
760 if (sense_hdr.asc == 0x3A) {
761 /* Medium not present */
762 blkdev->media_not_present = 1;
763 }
764 return 0;
765 }
766 buf = kmap(page_buf);
767
768 /* be to le */
769 blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1;
770 blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]);
771
772 #if 0
773 blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
774 (buf[2] << 8) | buf[3]) + 1;
775 blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
776 (buf[6] << 8) | buf[7];
777 #endif
778
779 kunmap(page_buf);
780
781 __free_page(page_buf);
782
783 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
784
785 return 0;
786 }
787
788 /*
789 * blkvsc_remove() - Callback when our device is removed
790 */
791 static int blkvsc_remove(struct device *device)
792 {
793 struct hv_driver *drv =
794 drv_to_hv_drv(device->driver);
795 struct storvsc_driver_object *storvsc_drv_obj =
796 drv->priv;
797 struct hv_device *device_obj = device_to_hv_device(device);
798 struct block_device_context *blkdev = dev_get_drvdata(device);
799 unsigned long flags;
800 int ret;
801
802 DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
803
804 if (!storvsc_drv_obj->base.dev_rm)
805 return -1;
806
807 /*
808 * Call to the vsc driver to let it know that the device is being
809 * removed
810 */
811 ret = storvsc_drv_obj->base.dev_rm(device_obj);
812 if (ret != 0) {
813 /* TODO: */
814 DPRINT_ERR(BLKVSC_DRV,
815 "unable to remove blkvsc device (ret %d)", ret);
816 }
817
818 /* Get to a known state */
819 spin_lock_irqsave(&blkdev->lock, flags);
820
821 blkdev->shutting_down = 1;
822
823 blk_stop_queue(blkdev->gd->queue);
824
825 spin_unlock_irqrestore(&blkdev->lock, flags);
826
827 while (blkdev->num_outstanding_reqs) {
828 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
829 blkdev->num_outstanding_reqs);
830 udelay(100);
831 }
832
833 blkvsc_do_flush(blkdev);
834
835 spin_lock_irqsave(&blkdev->lock, flags);
836
837 blkvsc_cancel_pending_reqs(blkdev);
838
839 spin_unlock_irqrestore(&blkdev->lock, flags);
840
841 blk_cleanup_queue(blkdev->gd->queue);
842
843 del_gendisk(blkdev->gd);
844
845 kmem_cache_destroy(blkdev->request_pool);
846
847 kfree(blkdev);
848
849 return ret;
850 }
851
852 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
853 {
854 /* ASSERT(blkvsc_req->req); */
855 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
856
857 blkvsc_req->cmd_len = 16;
858
859 if (blkvsc_req->sector_start > 0xffffffff) {
860 if (rq_data_dir(blkvsc_req->req)) {
861 blkvsc_req->write = 1;
862 blkvsc_req->cmnd[0] = WRITE_16;
863 } else {
864 blkvsc_req->write = 0;
865 blkvsc_req->cmnd[0] = READ_16;
866 }
867
868 blkvsc_req->cmnd[1] |=
869 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
870
871 *(unsigned long long *)&blkvsc_req->cmnd[2] =
872 cpu_to_be64(blkvsc_req->sector_start);
873 *(unsigned int *)&blkvsc_req->cmnd[10] =
874 cpu_to_be32(blkvsc_req->sector_count);
875 } else if ((blkvsc_req->sector_count > 0xff) ||
876 (blkvsc_req->sector_start > 0x1fffff)) {
877 if (rq_data_dir(blkvsc_req->req)) {
878 blkvsc_req->write = 1;
879 blkvsc_req->cmnd[0] = WRITE_10;
880 } else {
881 blkvsc_req->write = 0;
882 blkvsc_req->cmnd[0] = READ_10;
883 }
884
885 blkvsc_req->cmnd[1] |=
886 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
887
888 *(unsigned int *)&blkvsc_req->cmnd[2] =
889 cpu_to_be32(blkvsc_req->sector_start);
890 *(unsigned short *)&blkvsc_req->cmnd[7] =
891 cpu_to_be16(blkvsc_req->sector_count);
892 } else {
893 if (rq_data_dir(blkvsc_req->req)) {
894 blkvsc_req->write = 1;
895 blkvsc_req->cmnd[0] = WRITE_6;
896 } else {
897 blkvsc_req->write = 0;
898 blkvsc_req->cmnd[0] = READ_6;
899 }
900
901 *(unsigned int *)&blkvsc_req->cmnd[1] =
902 cpu_to_be32(blkvsc_req->sector_start) >> 8;
903 blkvsc_req->cmnd[1] &= 0x1f;
904 blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count;
905 }
906 }
907
908 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
909 void (*request_completion)(struct hv_storvsc_request *))
910 {
911 struct block_device_context *blkdev = blkvsc_req->dev;
912 struct hv_device *device_ctx = blkdev->device_ctx;
913 struct hv_driver *drv =
914 drv_to_hv_drv(device_ctx->device.driver);
915 struct storvsc_driver_object *storvsc_drv_obj =
916 drv->priv;
917 struct hv_storvsc_request *storvsc_req;
918 struct vmscsi_request *vm_srb;
919 int ret;
920
921 DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
922 "req %p type %s start_sector %lu count %ld offset %d "
923 "len %d\n", blkvsc_req,
924 (blkvsc_req->write) ? "WRITE" : "READ",
925 (unsigned long) blkvsc_req->sector_start,
926 blkvsc_req->sector_count,
927 blkvsc_req->request.data_buffer.offset,
928 blkvsc_req->request.data_buffer.len);
929 #if 0
930 for (i = 0; i < (blkvsc_req->request.data_buffer.len >> 12); i++) {
931 DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
932 "req %p pfn[%d] %llx\n",
933 blkvsc_req, i,
934 blkvsc_req->request.data_buffer.pfn_array[i]);
935 }
936 #endif
937
938 storvsc_req = &blkvsc_req->request;
939 vm_srb = &storvsc_req->extension.vstor_packet.vm_srb;
940
941 vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
942
943 storvsc_req->on_io_completion = request_completion;
944 storvsc_req->context = blkvsc_req;
945
946 vm_srb->port_number = blkdev->port;
947 storvsc_req->bus = blkdev->path;
948 storvsc_req->target_id = blkdev->target;
949 storvsc_req->lun_id = 0; /* this is not really used at all */
950
951 storvsc_req->cdb_len = blkvsc_req->cmd_len;
952 storvsc_req->cdb = blkvsc_req->cmnd;
953
954 storvsc_req->sense_buffer = blkvsc_req->sense_buffer;
955 storvsc_req->sense_buffer_size = SCSI_SENSE_BUFFERSIZE;
956
957 ret = storvsc_drv_obj->on_io_request(blkdev->device_ctx,
958 &blkvsc_req->request);
959 if (ret == 0)
960 blkdev->num_outstanding_reqs++;
961
962 return ret;
963 }
964
965 /*
966 * We break the request into 1 or more blkvsc_requests and submit
967 * them. If we cant submit them all, we put them on the
968 * pending_list. The blkvsc_request() will work on the pending_list.
969 */
970 static int blkvsc_do_request(struct block_device_context *blkdev,
971 struct request *req)
972 {
973 struct bio *bio = NULL;
974 struct bio_vec *bvec = NULL;
975 struct bio_vec *prev_bvec = NULL;
976 struct blkvsc_request *blkvsc_req = NULL;
977 struct blkvsc_request *tmp;
978 int databuf_idx = 0;
979 int seg_idx = 0;
980 sector_t start_sector;
981 unsigned long num_sectors = 0;
982 int ret = 0;
983 int pending = 0;
984 struct blkvsc_request_group *group = NULL;
985
986 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req,
987 (unsigned long)blk_rq_pos(req));
988
989 /* Create a group to tie req to list of blkvsc_reqs */
990 group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC);
991 if (!group)
992 return -ENOMEM;
993
994 INIT_LIST_HEAD(&group->blkvsc_req_list);
995 group->outstanding = group->status = 0;
996
997 start_sector = blk_rq_pos(req);
998
999 /* foreach bio in the request */
1000 if (req->bio) {
1001 for (bio = req->bio; bio; bio = bio->bi_next) {
1002 /*
1003 * Map this bio into an existing or new storvsc request
1004 */
1005 bio_for_each_segment(bvec, bio, seg_idx) {
1006 DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() "
1007 "- req %p bio %p bvec %p seg_idx %d "
1008 "databuf_idx %d\n", req, bio, bvec,
1009 seg_idx, databuf_idx);
1010
1011 /* Get a new storvsc request */
1012 /* 1st-time */
1013 if ((!blkvsc_req) ||
1014 (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT)
1015 /* hole at the begin of page */
1016 || (bvec->bv_offset != 0) ||
1017 /* hold at the end of page */
1018 (prev_bvec &&
1019 (prev_bvec->bv_len != PAGE_SIZE))) {
1020 /* submit the prev one */
1021 if (blkvsc_req) {
1022 blkvsc_req->sector_start = start_sector;
1023 sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9));
1024
1025 blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9);
1026 blkvsc_init_rw(blkvsc_req);
1027 }
1028
1029 /*
1030 * Create new blkvsc_req to represent
1031 * the current bvec
1032 */
1033 blkvsc_req =
1034 kmem_cache_zalloc(
1035 blkdev->request_pool, GFP_ATOMIC);
1036 if (!blkvsc_req) {
1037 /* free up everything */
1038 list_for_each_entry_safe(
1039 blkvsc_req, tmp,
1040 &group->blkvsc_req_list,
1041 req_entry) {
1042 list_del(&blkvsc_req->req_entry);
1043 kmem_cache_free(blkdev->request_pool, blkvsc_req);
1044 }
1045
1046 kmem_cache_free(blkdev->request_pool, group);
1047 return -ENOMEM;
1048 }
1049
1050 memset(blkvsc_req, 0,
1051 sizeof(struct blkvsc_request));
1052
1053 blkvsc_req->dev = blkdev;
1054 blkvsc_req->req = req;
1055 blkvsc_req->request.data_buffer.offset
1056 = bvec->bv_offset;
1057 blkvsc_req->request.data_buffer.len
1058 = 0;
1059
1060 /* Add to the group */
1061 blkvsc_req->group = group;
1062 blkvsc_req->group->outstanding++;
1063 list_add_tail(&blkvsc_req->req_entry,
1064 &blkvsc_req->group->blkvsc_req_list);
1065
1066 start_sector += num_sectors;
1067 num_sectors = 0;
1068 databuf_idx = 0;
1069 }
1070
1071 /* Add the curr bvec/segment to the curr blkvsc_req */
1072 blkvsc_req->request.data_buffer.
1073 pfn_array[databuf_idx]
1074 = page_to_pfn(bvec->bv_page);
1075 blkvsc_req->request.data_buffer.len
1076 += bvec->bv_len;
1077
1078 prev_bvec = bvec;
1079
1080 databuf_idx++;
1081 num_sectors += bvec->bv_len >> 9;
1082
1083 } /* bio_for_each_segment */
1084
1085 } /* rq_for_each_bio */
1086 }
1087
1088 /* Handle the last one */
1089 if (blkvsc_req) {
1090 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n",
1091 blkdev, req, blkvsc_req->group,
1092 blkvsc_req->group->outstanding);
1093
1094 blkvsc_req->sector_start = start_sector;
1095 sector_div(blkvsc_req->sector_start,
1096 (blkdev->sector_size >> 9));
1097
1098 blkvsc_req->sector_count = num_sectors /
1099 (blkdev->sector_size >> 9);
1100
1101 blkvsc_init_rw(blkvsc_req);
1102 }
1103
1104 list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
1105 if (pending) {
1106 DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to "
1107 "pending_list - blkvsc_req %p start_sect %lu"
1108 " sect_count %ld (%lu %ld)\n", blkvsc_req,
1109 (unsigned long)blkvsc_req->sector_start,
1110 blkvsc_req->sector_count,
1111 (unsigned long)start_sector,
1112 (unsigned long)num_sectors);
1113
1114 list_add_tail(&blkvsc_req->pend_entry,
1115 &blkdev->pending_list);
1116 } else {
1117 ret = blkvsc_submit_request(blkvsc_req,
1118 blkvsc_request_completion);
1119 if (ret == -1) {
1120 pending = 1;
1121 list_add_tail(&blkvsc_req->pend_entry,
1122 &blkdev->pending_list);
1123 }
1124
1125 DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p "
1126 "start_sect %lu sect_count %ld (%lu %ld) "
1127 "ret %d\n", blkvsc_req,
1128 (unsigned long)blkvsc_req->sector_start,
1129 blkvsc_req->sector_count,
1130 (unsigned long)start_sector,
1131 num_sectors, ret);
1132 }
1133 }
1134
1135 return pending;
1136 }
1137
1138 static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
1139 {
1140 struct blkvsc_request *blkvsc_req =
1141 (struct blkvsc_request *)request->context;
1142 struct block_device_context *blkdev =
1143 (struct block_device_context *)blkvsc_req->dev;
1144 struct scsi_sense_hdr sense_hdr;
1145
1146 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n",
1147 blkvsc_req);
1148
1149 blkdev->num_outstanding_reqs--;
1150
1151 if (blkvsc_req->request.status)
1152 if (scsi_normalize_sense(blkvsc_req->sense_buffer,
1153 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1154 scsi_print_sense_hdr("blkvsc", &sense_hdr);
1155
1156 blkvsc_req->cond = 1;
1157 wake_up_interruptible(&blkvsc_req->wevent);
1158 }
1159
1160 static void blkvsc_request_completion(struct hv_storvsc_request *request)
1161 {
1162 struct blkvsc_request *blkvsc_req =
1163 (struct blkvsc_request *)request->context;
1164 struct block_device_context *blkdev =
1165 (struct block_device_context *)blkvsc_req->dev;
1166 unsigned long flags;
1167 struct blkvsc_request *comp_req, *tmp;
1168
1169 /* ASSERT(blkvsc_req->group); */
1170
1171 DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s "
1172 "sect_start %lu sect_count %ld len %d group outstd %d "
1173 "total outstd %d\n",
1174 blkdev, blkvsc_req, blkvsc_req->group,
1175 (blkvsc_req->write) ? "WRITE" : "READ",
1176 (unsigned long)blkvsc_req->sector_start,
1177 blkvsc_req->sector_count,
1178 blkvsc_req->request.data_buffer.len,
1179 blkvsc_req->group->outstanding,
1180 blkdev->num_outstanding_reqs);
1181
1182 spin_lock_irqsave(&blkdev->lock, flags);
1183
1184 blkdev->num_outstanding_reqs--;
1185 blkvsc_req->group->outstanding--;
1186
1187 /*
1188 * Only start processing when all the blkvsc_reqs are
1189 * completed. This guarantees no out-of-order blkvsc_req
1190 * completion when calling end_that_request_first()
1191 */
1192 if (blkvsc_req->group->outstanding == 0) {
1193 list_for_each_entry_safe(comp_req, tmp,
1194 &blkvsc_req->group->blkvsc_req_list,
1195 req_entry) {
1196 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1197 "sect_start %lu sect_count %ld\n",
1198 comp_req,
1199 (unsigned long)comp_req->sector_start,
1200 comp_req->sector_count);
1201
1202 list_del(&comp_req->req_entry);
1203
1204 if (!__blk_end_request(comp_req->req,
1205 (!comp_req->request.status ? 0 : -EIO),
1206 comp_req->sector_count * blkdev->sector_size)) {
1207 /*
1208 * All the sectors have been xferred ie the
1209 * request is done
1210 */
1211 DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n",
1212 comp_req->req);
1213 kmem_cache_free(blkdev->request_pool,
1214 comp_req->group);
1215 }
1216
1217 kmem_cache_free(blkdev->request_pool, comp_req);
1218 }
1219
1220 if (!blkdev->shutting_down) {
1221 blkvsc_do_pending_reqs(blkdev);
1222 blk_start_queue(blkdev->gd->queue);
1223 blkvsc_request(blkdev->gd->queue);
1224 }
1225 }
1226
1227 spin_unlock_irqrestore(&blkdev->lock, flags);
1228 }
1229
1230 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
1231 {
1232 struct blkvsc_request *pend_req, *tmp;
1233 struct blkvsc_request *comp_req, *tmp2;
1234
1235 int ret = 0;
1236
1237 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()");
1238
1239 /* Flush the pending list first */
1240 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1241 pend_entry) {
1242 /*
1243 * The pend_req could be part of a partially completed
1244 * request. If so, complete those req first until we
1245 * hit the pend_req
1246 */
1247 list_for_each_entry_safe(comp_req, tmp2,
1248 &pend_req->group->blkvsc_req_list,
1249 req_entry) {
1250 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1251 "sect_start %lu sect_count %ld\n",
1252 comp_req,
1253 (unsigned long) comp_req->sector_start,
1254 comp_req->sector_count);
1255
1256 if (comp_req == pend_req)
1257 break;
1258
1259 list_del(&comp_req->req_entry);
1260
1261 if (comp_req->req) {
1262 ret = __blk_end_request(comp_req->req,
1263 (!comp_req->request.status ? 0 : -EIO),
1264 comp_req->sector_count *
1265 blkdev->sector_size);
1266
1267 /* FIXME: shouldn't this do more than return? */
1268 if (ret)
1269 goto out;
1270 }
1271
1272 kmem_cache_free(blkdev->request_pool, comp_req);
1273 }
1274
1275 DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n",
1276 pend_req);
1277
1278 list_del(&pend_req->pend_entry);
1279
1280 list_del(&pend_req->req_entry);
1281
1282 if (comp_req->req) {
1283 if (!__blk_end_request(pend_req->req, -EIO,
1284 pend_req->sector_count *
1285 blkdev->sector_size)) {
1286 /*
1287 * All the sectors have been xferred ie the
1288 * request is done
1289 */
1290 DPRINT_DBG(BLKVSC_DRV,
1291 "blkvsc_cancel_pending_reqs() - "
1292 "req %p COMPLETED\n", pend_req->req);
1293 kmem_cache_free(blkdev->request_pool,
1294 pend_req->group);
1295 }
1296 }
1297
1298 kmem_cache_free(blkdev->request_pool, pend_req);
1299 }
1300
1301 out:
1302 return ret;
1303 }
1304
1305 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
1306 {
1307 struct blkvsc_request *pend_req, *tmp;
1308 int ret = 0;
1309
1310 /* Flush the pending list first */
1311 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1312 pend_entry) {
1313 DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n",
1314 pend_req);
1315
1316 ret = blkvsc_submit_request(pend_req,
1317 blkvsc_request_completion);
1318 if (ret != 0)
1319 break;
1320 else
1321 list_del(&pend_req->pend_entry);
1322 }
1323
1324 return ret;
1325 }
1326
1327 static void blkvsc_request(struct request_queue *queue)
1328 {
1329 struct block_device_context *blkdev = NULL;
1330 struct request *req;
1331 int ret = 0;
1332
1333 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1334 while ((req = blk_peek_request(queue)) != NULL) {
1335 DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
1336
1337 blkdev = req->rq_disk->private_data;
1338 if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS ||
1339 blkdev->media_not_present) {
1340 __blk_end_request_cur(req, 0);
1341 continue;
1342 }
1343
1344 ret = blkvsc_do_pending_reqs(blkdev);
1345
1346 if (ret != 0) {
1347 DPRINT_DBG(BLKVSC_DRV,
1348 "- stop queue - pending_list not empty\n");
1349 blk_stop_queue(queue);
1350 break;
1351 }
1352
1353 blk_start_request(req);
1354
1355 ret = blkvsc_do_request(blkdev, req);
1356 if (ret > 0) {
1357 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n");
1358 blk_stop_queue(queue);
1359 break;
1360 } else if (ret < 0) {
1361 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n");
1362 blk_requeue_request(queue, req);
1363 blk_stop_queue(queue);
1364 break;
1365 }
1366 }
1367 }
1368
1369 static int blkvsc_open(struct block_device *bdev, fmode_t mode)
1370 {
1371 struct block_device_context *blkdev = bdev->bd_disk->private_data;
1372
1373 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1374 blkdev->gd->disk_name);
1375
1376 mutex_lock(&blkvsc_mutex);
1377 spin_lock(&blkdev->lock);
1378
1379 if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
1380 spin_unlock(&blkdev->lock);
1381 check_disk_change(bdev);
1382 spin_lock(&blkdev->lock);
1383 }
1384
1385 blkdev->users++;
1386
1387 spin_unlock(&blkdev->lock);
1388 mutex_unlock(&blkvsc_mutex);
1389 return 0;
1390 }
1391
1392 static int blkvsc_release(struct gendisk *disk, fmode_t mode)
1393 {
1394 struct block_device_context *blkdev = disk->private_data;
1395
1396 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1397 blkdev->gd->disk_name);
1398
1399 mutex_lock(&blkvsc_mutex);
1400 spin_lock(&blkdev->lock);
1401 if (blkdev->users == 1) {
1402 spin_unlock(&blkdev->lock);
1403 blkvsc_do_flush(blkdev);
1404 spin_lock(&blkdev->lock);
1405 }
1406
1407 blkdev->users--;
1408
1409 spin_unlock(&blkdev->lock);
1410 mutex_unlock(&blkvsc_mutex);
1411 return 0;
1412 }
1413
1414 static unsigned int blkvsc_check_events(struct gendisk *gd,
1415 unsigned int clearing)
1416 {
1417 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1418 return DISK_EVENT_MEDIA_CHANGE;
1419 }
1420
1421 static int blkvsc_revalidate_disk(struct gendisk *gd)
1422 {
1423 struct block_device_context *blkdev = gd->private_data;
1424
1425 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1426
1427 if (blkdev->device_type == DVD_TYPE) {
1428 blkvsc_do_read_capacity(blkdev);
1429 set_capacity(blkdev->gd, blkdev->capacity *
1430 (blkdev->sector_size/512));
1431 blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
1432 }
1433 return 0;
1434 }
1435
1436 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
1437 {
1438 sector_t total_sectors = get_capacity(bd->bd_disk);
1439 sector_t cylinder_times_heads = 0;
1440 sector_t temp = 0;
1441
1442 int sectors_per_track = 0;
1443 int heads = 0;
1444 int cylinders = 0;
1445 int rem = 0;
1446
1447 if (total_sectors > (65535 * 16 * 255))
1448 total_sectors = (65535 * 16 * 255);
1449
1450 if (total_sectors >= (65535 * 16 * 63)) {
1451 sectors_per_track = 255;
1452 heads = 16;
1453
1454 cylinder_times_heads = total_sectors;
1455 /* sector_div stores the quotient in cylinder_times_heads */
1456 rem = sector_div(cylinder_times_heads, sectors_per_track);
1457 } else {
1458 sectors_per_track = 17;
1459
1460 cylinder_times_heads = total_sectors;
1461 /* sector_div stores the quotient in cylinder_times_heads */
1462 rem = sector_div(cylinder_times_heads, sectors_per_track);
1463
1464 temp = cylinder_times_heads + 1023;
1465 /* sector_div stores the quotient in temp */
1466 rem = sector_div(temp, 1024);
1467
1468 heads = temp;
1469
1470 if (heads < 4)
1471 heads = 4;
1472
1473
1474 if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
1475 sectors_per_track = 31;
1476 heads = 16;
1477
1478 cylinder_times_heads = total_sectors;
1479 /*
1480 * sector_div stores the quotient in
1481 * cylinder_times_heads
1482 */
1483 rem = sector_div(cylinder_times_heads,
1484 sectors_per_track);
1485 }
1486
1487 if (cylinder_times_heads >= (heads * 1024)) {
1488 sectors_per_track = 63;
1489 heads = 16;
1490
1491 cylinder_times_heads = total_sectors;
1492 /*
1493 * sector_div stores the quotient in
1494 * cylinder_times_heads
1495 */
1496 rem = sector_div(cylinder_times_heads,
1497 sectors_per_track);
1498 }
1499 }
1500
1501 temp = cylinder_times_heads;
1502 /* sector_div stores the quotient in temp */
1503 rem = sector_div(temp, heads);
1504 cylinders = temp;
1505
1506 hg->heads = heads;
1507 hg->sectors = sectors_per_track;
1508 hg->cylinders = cylinders;
1509
1510 DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
1511 sectors_per_track);
1512
1513 return 0;
1514 }
1515
1516 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
1517 unsigned cmd, unsigned long argument)
1518 {
1519 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1520 int ret;
1521
1522 switch (cmd) {
1523 /*
1524 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1525 * than just a GUID. Commented it out for now.
1526 */
1527 #if 0
1528 case HDIO_GET_IDENTITY:
1529 DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n");
1530 if (copy_to_user((void __user *)arg, blkdev->device_id,
1531 blkdev->device_id_len))
1532 ret = -EFAULT;
1533 break;
1534 #endif
1535 default:
1536 ret = -EINVAL;
1537 break;
1538 }
1539
1540 return ret;
1541 }
1542
1543 static int __init blkvsc_init(void)
1544 {
1545 int ret;
1546
1547 BUILD_BUG_ON(sizeof(sector_t) != 8);
1548
1549 DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
1550
1551 ret = blkvsc_drv_init();
1552
1553 return ret;
1554 }
1555
1556 static void __exit blkvsc_exit(void)
1557 {
1558 blkvsc_drv_exit();
1559 }
1560
1561 MODULE_LICENSE("GPL");
1562 MODULE_VERSION(HV_DRV_VERSION);
1563 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1564 module_init(blkvsc_init);
1565 module_exit(blkvsc_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree