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Commit | Line | Data |
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f82bd046 | 1 | /* |
f82bd046 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
d0e94d17 | 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
f82bd046 | 19 | * Hank Janssen <hjanssen@microsoft.com> |
f82bd046 | 20 | */ |
f82bd046 HJ |
21 | #include <linux/init.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/hdreg.h> | |
2a48fc0a | 28 | #include <linux/mutex.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
f82bd046 HJ |
30 | #include <scsi/scsi.h> |
31 | #include <scsi/scsi_cmnd.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_dbg.h> | |
4983b39a | 34 | #include "osd.h" |
645954c5 | 35 | #include "logging.h" |
2d82f6c7 | 36 | #include "version_info.h" |
870cde80 | 37 | #include "vmbus.h" |
bb969793 | 38 | #include "storvsc_api.h" |
f82bd046 | 39 | |
454f18a9 | 40 | |
f82bd046 HJ |
41 | #define BLKVSC_MINORS 64 |
42 | ||
f82bd046 HJ |
43 | enum blkvsc_device_type { |
44 | UNKNOWN_DEV_TYPE, | |
45 | HARDDISK_TYPE, | |
46 | DVD_TYPE, | |
47 | }; | |
48 | ||
454f18a9 BP |
49 | /* |
50 | * This request ties the struct request and struct | |
0b3f6834 | 51 | * blkvsc_request/hv_storvsc_request together A struct request may be |
454f18a9 BP |
52 | * represented by 1 or more struct blkvsc_request |
53 | */ | |
f82bd046 | 54 | struct blkvsc_request_group { |
8a280399 GKH |
55 | int outstanding; |
56 | int status; | |
57 | struct list_head blkvsc_req_list; /* list of blkvsc_requests */ | |
f82bd046 HJ |
58 | }; |
59 | ||
f82bd046 | 60 | struct blkvsc_request { |
8a280399 GKH |
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; | |
f82bd046 | 69 | |
8a280399 | 70 | struct block_device_context *dev; |
f82bd046 | 71 | |
8a280399 GKH |
72 | /* The group this request is part of. Maybe null */ |
73 | struct blkvsc_request_group *group; | |
f82bd046 | 74 | |
8a280399 | 75 | wait_queue_head_t wevent; |
f82bd046 HJ |
76 | int cond; |
77 | ||
8a280399 GKH |
78 | int write; |
79 | sector_t sector_start; | |
80 | unsigned long sector_count; | |
f82bd046 HJ |
81 | |
82 | unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; | |
83 | unsigned char cmd_len; | |
84 | unsigned char cmnd[MAX_COMMAND_SIZE]; | |
85 | ||
0b3f6834 | 86 | struct hv_storvsc_request request; |
8a280399 GKH |
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 | */ | |
f82bd046 HJ |
93 | }; |
94 | ||
454f18a9 | 95 | /* Per device structure */ |
f82bd046 | 96 | struct block_device_context { |
8a280399 | 97 | /* point back to our device context */ |
f916a34d | 98 | struct vm_device *device_ctx; |
8a280399 GKH |
99 | struct kmem_cache *request_pool; |
100 | spinlock_t lock; | |
101 | struct gendisk *gd; | |
f82bd046 | 102 | enum blkvsc_device_type device_type; |
8a280399 GKH |
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; | |
f82bd046 HJ |
116 | }; |
117 | ||
454f18a9 | 118 | /* Per driver */ |
f82bd046 | 119 | struct blkvsc_driver_context { |
454f18a9 | 120 | /* !! These must be the first 2 fields !! */ |
8a280399 GKH |
121 | /* FIXME this is a bug! */ |
122 | struct driver_context drv_ctx; | |
9f0c7d2c | 123 | struct storvsc_driver_object drv_obj; |
f82bd046 HJ |
124 | }; |
125 | ||
454f18a9 | 126 | /* Static decl */ |
2a48fc0a | 127 | static DEFINE_MUTEX(blkvsc_mutex); |
f82bd046 HJ |
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 | ||
39635f7d | 132 | static int blkvsc_open(struct block_device *bdev, fmode_t mode); |
77d2d9da | 133 | static int blkvsc_release(struct gendisk *disk, fmode_t mode); |
f82bd046 HJ |
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); | |
dfe8b2d9 BP |
137 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
138 | unsigned cmd, unsigned long argument); | |
f82bd046 | 139 | static void blkvsc_request(struct request_queue *queue); |
0b3f6834 | 140 | static void blkvsc_request_completion(struct hv_storvsc_request *request); |
8a280399 GKH |
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 *)); | |
f82bd046 | 145 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); |
0b3f6834 | 146 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request); |
f82bd046 HJ |
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 | ||
f82bd046 | 154 | static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; |
1ec28abb SH |
155 | module_param(blkvsc_ringbuffer_size, int, S_IRUGO); |
156 | MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)"); | |
f82bd046 | 157 | |
454f18a9 | 158 | /* The one and only one */ |
f82bd046 HJ |
159 | static struct blkvsc_driver_context g_blkvsc_drv; |
160 | ||
48c9f7c3 | 161 | static const struct block_device_operations block_ops = { |
f82bd046 HJ |
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 | ||
3e189519 | 171 | /* |
8a280399 GKH |
172 | * blkvsc_drv_init - BlkVsc driver initialization. |
173 | */ | |
21707bed | 174 | static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) |
f82bd046 | 175 | { |
9f0c7d2c | 176 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
177 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
178 | int ret; | |
f82bd046 | 179 | |
f82bd046 HJ |
180 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); |
181 | ||
182 | storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size; | |
183 | ||
454f18a9 | 184 | /* Callback to client driver to complete the initialization */ |
21707bed | 185 | drv_init(&storvsc_drv_obj->Base); |
f82bd046 HJ |
186 | |
187 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
8a280399 GKH |
188 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, |
189 | sizeof(struct hv_guid)); | |
f82bd046 | 190 | |
f82bd046 HJ |
191 | drv_ctx->probe = blkvsc_probe; |
192 | drv_ctx->remove = blkvsc_remove; | |
193 | drv_ctx->shutdown = blkvsc_shutdown; | |
f82bd046 | 194 | |
454f18a9 | 195 | /* The driver belongs to vmbus */ |
5d48a1c2 | 196 | ret = vmbus_child_driver_register(drv_ctx); |
f82bd046 | 197 | |
f82bd046 HJ |
198 | return ret; |
199 | } | |
200 | ||
f82bd046 HJ |
201 | static int blkvsc_drv_exit_cb(struct device *dev, void *data) |
202 | { | |
203 | struct device **curr = (struct device **)data; | |
204 | *curr = dev; | |
454f18a9 | 205 | return 1; /* stop iterating */ |
f82bd046 HJ |
206 | } |
207 | ||
bd1de709 | 208 | static void blkvsc_drv_exit(void) |
f82bd046 | 209 | { |
9f0c7d2c | 210 | struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; |
8a280399 GKH |
211 | struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; |
212 | struct device *current_dev; | |
2295ba2e | 213 | int ret; |
f82bd046 | 214 | |
8a280399 | 215 | while (1) { |
f82bd046 HJ |
216 | current_dev = NULL; |
217 | ||
454f18a9 | 218 | /* Get the device */ |
2295ba2e BP |
219 | ret = driver_for_each_device(&drv_ctx->driver, NULL, |
220 | (void *) ¤t_dev, | |
221 | blkvsc_drv_exit_cb); | |
222 | ||
223 | if (ret) | |
224 | DPRINT_WARN(BLKVSC_DRV, | |
225 | "driver_for_each_device returned %d", ret); | |
226 | ||
f82bd046 HJ |
227 | |
228 | if (current_dev == NULL) | |
229 | break; | |
230 | ||
454f18a9 | 231 | /* Initiate removal from the top-down */ |
f82bd046 HJ |
232 | device_unregister(current_dev); |
233 | } | |
234 | ||
235 | if (storvsc_drv_obj->Base.OnCleanup) | |
236 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
237 | ||
238 | vmbus_child_driver_unregister(drv_ctx); | |
239 | ||
f82bd046 HJ |
240 | return; |
241 | } | |
242 | ||
3e189519 | 243 | /* |
8a280399 GKH |
244 | * blkvsc_probe - Add a new device for this driver |
245 | */ | |
f82bd046 HJ |
246 | static int blkvsc_probe(struct device *device) |
247 | { | |
8a280399 GKH |
248 | struct driver_context *driver_ctx = |
249 | driver_to_driver_context(device->driver); | |
250 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
251 | (struct blkvsc_driver_context *)driver_ctx; | |
252 | struct storvsc_driver_object *storvsc_drv_obj = | |
253 | &blkvsc_drv_ctx->drv_obj; | |
f916a34d | 254 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 255 | struct hv_device *device_obj = &device_ctx->device_obj; |
f82bd046 | 256 | |
8a280399 | 257 | struct block_device_context *blkdev = NULL; |
9f0c7d2c | 258 | struct storvsc_device_info device_info; |
8a280399 GKH |
259 | int major = 0; |
260 | int devnum = 0; | |
261 | int ret = 0; | |
262 | static int ide0_registered; | |
263 | static int ide1_registered; | |
f82bd046 | 264 | |
f82bd046 HJ |
265 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter"); |
266 | ||
8a280399 | 267 | if (!storvsc_drv_obj->Base.OnDeviceAdd) { |
f82bd046 | 268 | DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set"); |
f82bd046 HJ |
269 | ret = -1; |
270 | goto Cleanup; | |
271 | } | |
272 | ||
273 | blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); | |
8a280399 | 274 | if (!blkdev) { |
f82bd046 HJ |
275 | ret = -ENOMEM; |
276 | goto Cleanup; | |
277 | } | |
278 | ||
279 | INIT_LIST_HEAD(&blkdev->pending_list); | |
280 | ||
454f18a9 | 281 | /* Initialize what we can here */ |
f82bd046 HJ |
282 | spin_lock_init(&blkdev->lock); |
283 | ||
4e5166b5 BP |
284 | /* ASSERT(sizeof(struct blkvsc_request_group) <= */ |
285 | /* sizeof(struct blkvsc_request)); */ | |
f82bd046 | 286 | |
454f18a9 | 287 | blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device), |
8a280399 GKH |
288 | sizeof(struct blkvsc_request) + |
289 | storvsc_drv_obj->RequestExtSize, 0, | |
290 | SLAB_HWCACHE_ALIGN, NULL); | |
291 | if (!blkdev->request_pool) { | |
f82bd046 HJ |
292 | ret = -ENOMEM; |
293 | goto Cleanup; | |
294 | } | |
295 | ||
296 | ||
454f18a9 | 297 | /* Call to the vsc driver to add the device */ |
f82bd046 | 298 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info); |
8a280399 | 299 | if (ret != 0) { |
f82bd046 HJ |
300 | DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device"); |
301 | goto Cleanup; | |
302 | } | |
303 | ||
304 | blkdev->device_ctx = device_ctx; | |
8a280399 GKH |
305 | /* this identified the device 0 or 1 */ |
306 | blkdev->target = device_info.TargetId; | |
307 | /* this identified the ide ctrl 0 or 1 */ | |
308 | blkdev->path = device_info.PathId; | |
f82bd046 | 309 | |
b57a68dc | 310 | dev_set_drvdata(device, blkdev); |
f82bd046 | 311 | |
454f18a9 | 312 | /* Calculate the major and device num */ |
8a280399 | 313 | if (blkdev->path == 0) { |
f82bd046 | 314 | major = IDE0_MAJOR; |
454f18a9 | 315 | devnum = blkdev->path + blkdev->target; /* 0 or 1 */ |
f82bd046 | 316 | |
8a280399 | 317 | if (!ide0_registered) { |
f82bd046 | 318 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
319 | if (ret != 0) { |
320 | DPRINT_ERR(BLKVSC_DRV, | |
321 | "register_blkdev() failed! ret %d", | |
322 | ret); | |
f82bd046 HJ |
323 | goto Remove; |
324 | } | |
325 | ||
326 | ide0_registered = 1; | |
327 | } | |
8a280399 | 328 | } else if (blkdev->path == 1) { |
f82bd046 | 329 | major = IDE1_MAJOR; |
454f18a9 | 330 | devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */ |
f82bd046 | 331 | |
8a280399 | 332 | if (!ide1_registered) { |
f82bd046 | 333 | ret = register_blkdev(major, "ide"); |
8a280399 GKH |
334 | if (ret != 0) { |
335 | DPRINT_ERR(BLKVSC_DRV, | |
336 | "register_blkdev() failed! ret %d", | |
337 | ret); | |
f82bd046 HJ |
338 | goto Remove; |
339 | } | |
340 | ||
341 | ide1_registered = 1; | |
342 | } | |
8a280399 | 343 | } else { |
f82bd046 HJ |
344 | DPRINT_ERR(BLKVSC_DRV, "invalid pathid"); |
345 | ret = -1; | |
346 | goto Cleanup; | |
347 | } | |
348 | ||
349 | DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major); | |
350 | ||
351 | blkdev->gd = alloc_disk(BLKVSC_MINORS); | |
8a280399 | 352 | if (!blkdev->gd) { |
f82bd046 HJ |
353 | DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); |
354 | ret = -1; | |
355 | goto Cleanup; | |
356 | } | |
357 | ||
358 | blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); | |
359 | ||
360 | blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); | |
8a78362c | 361 | blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); |
f82bd046 HJ |
362 | blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); |
363 | blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); | |
364 | blk_queue_dma_alignment(blkdev->gd->queue, 511); | |
365 | ||
366 | blkdev->gd->major = major; | |
367 | if (devnum == 1 || devnum == 3) | |
368 | blkdev->gd->first_minor = BLKVSC_MINORS; | |
369 | else | |
370 | blkdev->gd->first_minor = 0; | |
371 | blkdev->gd->fops = &block_ops; | |
372 | blkdev->gd->private_data = blkdev; | |
8a280399 | 373 | sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum); |
f82bd046 HJ |
374 | |
375 | blkvsc_do_inquiry(blkdev); | |
8a280399 | 376 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 HJ |
377 | set_disk_ro(blkdev->gd, 1); |
378 | blkdev->gd->flags |= GENHD_FL_REMOVABLE; | |
379 | blkvsc_do_read_capacity(blkdev); | |
8a280399 | 380 | } else { |
f82bd046 HJ |
381 | blkvsc_do_read_capacity16(blkdev); |
382 | } | |
383 | ||
384 | set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
0fce4c2f | 385 | blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); |
454f18a9 | 386 | /* go! */ |
f82bd046 HJ |
387 | add_disk(blkdev->gd); |
388 | ||
8a280399 GKH |
389 | DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", |
390 | blkdev->gd->disk_name, (unsigned long)blkdev->capacity, | |
391 | blkdev->sector_size); | |
f82bd046 HJ |
392 | |
393 | return ret; | |
394 | ||
395 | Remove: | |
396 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
397 | ||
398 | Cleanup: | |
8a280399 GKH |
399 | if (blkdev) { |
400 | if (blkdev->request_pool) { | |
f82bd046 HJ |
401 | kmem_cache_destroy(blkdev->request_pool); |
402 | blkdev->request_pool = NULL; | |
403 | } | |
404 | kfree(blkdev); | |
405 | blkdev = NULL; | |
406 | } | |
407 | ||
f82bd046 HJ |
408 | return ret; |
409 | } | |
410 | ||
411 | static void blkvsc_shutdown(struct device *device) | |
412 | { | |
b57a68dc | 413 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 HJ |
414 | unsigned long flags; |
415 | ||
416 | if (!blkdev) | |
417 | return; | |
418 | ||
8a280399 GKH |
419 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n", |
420 | blkdev->users, blkdev->gd->disk_name); | |
f82bd046 HJ |
421 | |
422 | spin_lock_irqsave(&blkdev->lock, flags); | |
423 | ||
424 | blkdev->shutting_down = 1; | |
425 | ||
426 | blk_stop_queue(blkdev->gd->queue); | |
427 | ||
428 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
429 | ||
8a280399 GKH |
430 | while (blkdev->num_outstanding_reqs) { |
431 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
432 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
433 | udelay(100); |
434 | } | |
435 | ||
436 | blkvsc_do_flush(blkdev); | |
437 | ||
438 | spin_lock_irqsave(&blkdev->lock, flags); | |
439 | ||
440 | blkvsc_cancel_pending_reqs(blkdev); | |
441 | ||
442 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
443 | } | |
444 | ||
445 | static int blkvsc_do_flush(struct block_device_context *blkdev) | |
446 | { | |
8a280399 | 447 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
448 | |
449 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n"); | |
450 | ||
451 | if (blkdev->device_type != HARDDISK_TYPE) | |
452 | return 0; | |
453 | ||
454 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
455 | if (!blkvsc_req) | |
f82bd046 | 456 | return -ENOMEM; |
f82bd046 HJ |
457 | |
458 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
459 | init_waitqueue_head(&blkvsc_req->wevent); | |
460 | blkvsc_req->dev = blkdev; | |
461 | blkvsc_req->req = NULL; | |
462 | blkvsc_req->write = 0; | |
463 | ||
464 | blkvsc_req->request.DataBuffer.PfnArray[0] = 0; | |
465 | blkvsc_req->request.DataBuffer.Offset = 0; | |
466 | blkvsc_req->request.DataBuffer.Length = 0; | |
467 | ||
468 | blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; | |
469 | blkvsc_req->cmd_len = 10; | |
470 | ||
8a280399 GKH |
471 | /* |
472 | * Set this here since the completion routine may be invoked and | |
473 | * completed before we return | |
474 | */ | |
475 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
476 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); |
477 | ||
478 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
479 | ||
480 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
454f18a9 | 485 | /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */ |
f82bd046 HJ |
486 | static int blkvsc_do_inquiry(struct block_device_context *blkdev) |
487 | { | |
8a280399 | 488 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
489 | struct page *page_buf; |
490 | unsigned char *buf; | |
491 | unsigned char device_type; | |
492 | ||
493 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n"); | |
494 | ||
495 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
496 | if (!blkvsc_req) | |
f82bd046 | 497 | return -ENOMEM; |
f82bd046 HJ |
498 | |
499 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
500 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 501 | if (!page_buf) { |
f82bd046 HJ |
502 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
506 | init_waitqueue_head(&blkvsc_req->wevent); | |
507 | blkvsc_req->dev = blkdev; | |
508 | blkvsc_req->req = NULL; | |
509 | blkvsc_req->write = 0; | |
510 | ||
511 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
512 | blkvsc_req->request.DataBuffer.Offset = 0; | |
513 | blkvsc_req->request.DataBuffer.Length = 64; | |
514 | ||
515 | blkvsc_req->cmnd[0] = INQUIRY; | |
454f18a9 BP |
516 | blkvsc_req->cmnd[1] = 0x1; /* Get product data */ |
517 | blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ | |
f82bd046 HJ |
518 | blkvsc_req->cmnd[4] = 64; |
519 | blkvsc_req->cmd_len = 6; | |
520 | ||
8a280399 GKH |
521 | /* |
522 | * Set this here since the completion routine may be invoked and | |
523 | * completed before we return | |
524 | */ | |
525 | blkvsc_req->cond = 0; | |
f82bd046 HJ |
526 | |
527 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
528 | ||
8a280399 GKH |
529 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
530 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
531 | |
532 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
533 | ||
534 | buf = kmap(page_buf); | |
535 | ||
04f50c4d | 536 | /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */ |
454f18a9 | 537 | /* be to le */ |
f82bd046 HJ |
538 | device_type = buf[0] & 0x1F; |
539 | ||
8a280399 | 540 | if (device_type == 0x0) { |
f82bd046 | 541 | blkdev->device_type = HARDDISK_TYPE; |
8a280399 | 542 | } else if (device_type == 0x5) { |
f82bd046 | 543 | blkdev->device_type = DVD_TYPE; |
8a280399 | 544 | } else { |
454f18a9 | 545 | /* TODO: this is currently unsupported device type */ |
f82bd046 HJ |
546 | blkdev->device_type = UNKNOWN_DEV_TYPE; |
547 | } | |
548 | ||
0686e4f4 | 549 | DPRINT_DBG(BLKVSC_DRV, "device type %d\n", device_type); |
f82bd046 HJ |
550 | |
551 | blkdev->device_id_len = buf[7]; | |
552 | if (blkdev->device_id_len > 64) | |
553 | blkdev->device_id_len = 64; | |
554 | ||
555 | memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); | |
04f50c4d | 556 | /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id, |
454f18a9 | 557 | * blkdev->device_id_len); */ |
f82bd046 HJ |
558 | |
559 | kunmap(page_buf); | |
560 | ||
561 | __free_page(page_buf); | |
562 | ||
563 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
454f18a9 | 568 | /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */ |
f82bd046 HJ |
569 | static int blkvsc_do_read_capacity(struct block_device_context *blkdev) |
570 | { | |
8a280399 | 571 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
572 | struct page *page_buf; |
573 | unsigned char *buf; | |
574 | struct scsi_sense_hdr sense_hdr; | |
575 | ||
576 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n"); | |
577 | ||
578 | blkdev->sector_size = 0; | |
579 | blkdev->capacity = 0; | |
454f18a9 | 580 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
581 | |
582 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
583 | if (!blkvsc_req) | |
f82bd046 | 584 | return -ENOMEM; |
f82bd046 HJ |
585 | |
586 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
587 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 588 | if (!page_buf) { |
f82bd046 HJ |
589 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
590 | return -ENOMEM; | |
591 | } | |
592 | ||
593 | init_waitqueue_head(&blkvsc_req->wevent); | |
594 | blkvsc_req->dev = blkdev; | |
595 | blkvsc_req->req = NULL; | |
596 | blkvsc_req->write = 0; | |
597 | ||
598 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
599 | blkvsc_req->request.DataBuffer.Offset = 0; | |
600 | blkvsc_req->request.DataBuffer.Length = 8; | |
601 | ||
602 | blkvsc_req->cmnd[0] = READ_CAPACITY; | |
603 | blkvsc_req->cmd_len = 16; | |
604 | ||
454f18a9 BP |
605 | /* |
606 | * Set this here since the completion routine may be invoked | |
607 | * and completed before we return | |
608 | */ | |
8a280399 | 609 | blkvsc_req->cond = 0; |
f82bd046 HJ |
610 | |
611 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
612 | ||
8a280399 GKH |
613 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
614 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
615 | |
616 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
617 | ||
454f18a9 | 618 | /* check error */ |
8a280399 GKH |
619 | if (blkvsc_req->request.Status) { |
620 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
621 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
f82bd046 | 622 | |
8a280399 GKH |
623 | if (sense_hdr.asc == 0x3A) { |
624 | /* Medium not present */ | |
f82bd046 HJ |
625 | blkdev->media_not_present = 1; |
626 | } | |
f82bd046 HJ |
627 | return 0; |
628 | } | |
629 | buf = kmap(page_buf); | |
630 | ||
454f18a9 | 631 | /* be to le */ |
8a280399 GKH |
632 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | |
633 | (buf[2] << 8) | buf[3]) + 1; | |
634 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
635 | (buf[6] << 8) | buf[7]; | |
f82bd046 HJ |
636 | |
637 | kunmap(page_buf); | |
638 | ||
639 | __free_page(page_buf); | |
640 | ||
641 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
f82bd046 HJ |
646 | static int blkvsc_do_read_capacity16(struct block_device_context *blkdev) |
647 | { | |
8a280399 | 648 | struct blkvsc_request *blkvsc_req; |
f82bd046 HJ |
649 | struct page *page_buf; |
650 | unsigned char *buf; | |
651 | struct scsi_sense_hdr sense_hdr; | |
652 | ||
653 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n"); | |
654 | ||
655 | blkdev->sector_size = 0; | |
656 | blkdev->capacity = 0; | |
454f18a9 | 657 | blkdev->media_not_present = 0; /* assume a disk is present */ |
f82bd046 HJ |
658 | |
659 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
660 | if (!blkvsc_req) | |
f82bd046 | 661 | return -ENOMEM; |
f82bd046 HJ |
662 | |
663 | memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
664 | page_buf = alloc_page(GFP_KERNEL); | |
8a280399 | 665 | if (!page_buf) { |
f82bd046 HJ |
666 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); |
667 | return -ENOMEM; | |
668 | } | |
669 | ||
670 | init_waitqueue_head(&blkvsc_req->wevent); | |
671 | blkvsc_req->dev = blkdev; | |
672 | blkvsc_req->req = NULL; | |
673 | blkvsc_req->write = 0; | |
674 | ||
675 | blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
676 | blkvsc_req->request.DataBuffer.Offset = 0; | |
677 | blkvsc_req->request.DataBuffer.Length = 12; | |
678 | ||
454f18a9 | 679 | blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */ |
f82bd046 HJ |
680 | blkvsc_req->cmd_len = 16; |
681 | ||
454f18a9 BP |
682 | /* |
683 | * Set this here since the completion routine may be invoked | |
684 | * and completed before we return | |
685 | */ | |
8a280399 | 686 | blkvsc_req->cond = 0; |
f82bd046 HJ |
687 | |
688 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
689 | ||
8a280399 GKH |
690 | DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", |
691 | blkvsc_req, blkvsc_req->cond); | |
f82bd046 HJ |
692 | |
693 | wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
694 | ||
454f18a9 | 695 | /* check error */ |
8a280399 GKH |
696 | if (blkvsc_req->request.Status) { |
697 | scsi_normalize_sense(blkvsc_req->sense_buffer, | |
698 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
699 | if (sense_hdr.asc == 0x3A) { | |
700 | /* Medium not present */ | |
f82bd046 HJ |
701 | blkdev->media_not_present = 1; |
702 | } | |
f82bd046 HJ |
703 | return 0; |
704 | } | |
705 | buf = kmap(page_buf); | |
706 | ||
454f18a9 | 707 | /* be to le */ |
8a280399 GKH |
708 | blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1; |
709 | blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]); | |
f82bd046 | 710 | |
8a280399 GKH |
711 | #if 0 |
712 | blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | | |
713 | (buf[2] << 8) | buf[3]) + 1; | |
714 | blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | | |
715 | (buf[6] << 8) | buf[7]; | |
716 | #endif | |
f82bd046 HJ |
717 | |
718 | kunmap(page_buf); | |
719 | ||
720 | __free_page(page_buf); | |
721 | ||
722 | kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
3e189519 | 727 | /* |
8a280399 GKH |
728 | * blkvsc_remove() - Callback when our device is removed |
729 | */ | |
f82bd046 HJ |
730 | static int blkvsc_remove(struct device *device) |
731 | { | |
8a280399 GKH |
732 | struct driver_context *driver_ctx = |
733 | driver_to_driver_context(device->driver); | |
734 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
735 | (struct blkvsc_driver_context *)driver_ctx; | |
736 | struct storvsc_driver_object *storvsc_drv_obj = | |
737 | &blkvsc_drv_ctx->drv_obj; | |
f916a34d | 738 | struct vm_device *device_ctx = device_to_vm_device(device); |
3d3b5518 | 739 | struct hv_device *device_obj = &device_ctx->device_obj; |
b57a68dc | 740 | struct block_device_context *blkdev = dev_get_drvdata(device); |
f82bd046 | 741 | unsigned long flags; |
8a280399 | 742 | int ret; |
f82bd046 | 743 | |
f82bd046 HJ |
744 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n"); |
745 | ||
83c720ea | 746 | if (!storvsc_drv_obj->Base.OnDeviceRemove) |
f82bd046 | 747 | return -1; |
f82bd046 | 748 | |
8a280399 GKH |
749 | /* |
750 | * Call to the vsc driver to let it know that the device is being | |
751 | * removed | |
752 | */ | |
f82bd046 | 753 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
8a280399 | 754 | if (ret != 0) { |
454f18a9 | 755 | /* TODO: */ |
8a280399 GKH |
756 | DPRINT_ERR(BLKVSC_DRV, |
757 | "unable to remove blkvsc device (ret %d)", ret); | |
f82bd046 HJ |
758 | } |
759 | ||
454f18a9 | 760 | /* Get to a known state */ |
f82bd046 HJ |
761 | spin_lock_irqsave(&blkdev->lock, flags); |
762 | ||
763 | blkdev->shutting_down = 1; | |
764 | ||
765 | blk_stop_queue(blkdev->gd->queue); | |
766 | ||
767 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
768 | ||
8a280399 GKH |
769 | while (blkdev->num_outstanding_reqs) { |
770 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", | |
771 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
772 | udelay(100); |
773 | } | |
774 | ||
775 | blkvsc_do_flush(blkdev); | |
776 | ||
777 | spin_lock_irqsave(&blkdev->lock, flags); | |
778 | ||
779 | blkvsc_cancel_pending_reqs(blkdev); | |
780 | ||
781 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
782 | ||
783 | blk_cleanup_queue(blkdev->gd->queue); | |
784 | ||
785 | del_gendisk(blkdev->gd); | |
786 | ||
787 | kmem_cache_destroy(blkdev->request_pool); | |
788 | ||
789 | kfree(blkdev); | |
790 | ||
f82bd046 HJ |
791 | return ret; |
792 | } | |
793 | ||
794 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) | |
795 | { | |
4e5166b5 BP |
796 | /* ASSERT(blkvsc_req->req); */ |
797 | /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */ | |
f82bd046 HJ |
798 | |
799 | blkvsc_req->cmd_len = 16; | |
800 | ||
8a280399 GKH |
801 | if (blkvsc_req->sector_start > 0xffffffff) { |
802 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
803 | blkvsc_req->write = 1; |
804 | blkvsc_req->cmnd[0] = WRITE_16; | |
8a280399 | 805 | } else { |
f82bd046 HJ |
806 | blkvsc_req->write = 0; |
807 | blkvsc_req->cmnd[0] = READ_16; | |
808 | } | |
809 | ||
33659ebb CH |
810 | blkvsc_req->cmnd[1] |= |
811 | (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0; | |
f82bd046 | 812 | |
8a280399 GKH |
813 | *(unsigned long long *)&blkvsc_req->cmnd[2] = |
814 | cpu_to_be64(blkvsc_req->sector_start); | |
815 | *(unsigned int *)&blkvsc_req->cmnd[10] = | |
816 | cpu_to_be32(blkvsc_req->sector_count); | |
817 | } else if ((blkvsc_req->sector_count > 0xff) || | |
818 | (blkvsc_req->sector_start > 0x1fffff)) { | |
819 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
820 | blkvsc_req->write = 1; |
821 | blkvsc_req->cmnd[0] = WRITE_10; | |
8a280399 | 822 | } else { |
f82bd046 HJ |
823 | blkvsc_req->write = 0; |
824 | blkvsc_req->cmnd[0] = READ_10; | |
825 | } | |
826 | ||
33659ebb CH |
827 | blkvsc_req->cmnd[1] |= |
828 | (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0; | |
f82bd046 | 829 | |
8a280399 GKH |
830 | *(unsigned int *)&blkvsc_req->cmnd[2] = |
831 | cpu_to_be32(blkvsc_req->sector_start); | |
832 | *(unsigned short *)&blkvsc_req->cmnd[7] = | |
833 | cpu_to_be16(blkvsc_req->sector_count); | |
834 | } else { | |
835 | if (rq_data_dir(blkvsc_req->req)) { | |
f82bd046 HJ |
836 | blkvsc_req->write = 1; |
837 | blkvsc_req->cmnd[0] = WRITE_6; | |
8a280399 | 838 | } else { |
f82bd046 HJ |
839 | blkvsc_req->write = 0; |
840 | blkvsc_req->cmnd[0] = READ_6; | |
841 | } | |
842 | ||
8a280399 GKH |
843 | *(unsigned int *)&blkvsc_req->cmnd[1] = |
844 | cpu_to_be32(blkvsc_req->sector_start) >> 8; | |
f82bd046 | 845 | blkvsc_req->cmnd[1] &= 0x1f; |
8a280399 | 846 | blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count; |
f82bd046 HJ |
847 | } |
848 | } | |
849 | ||
8a280399 GKH |
850 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, |
851 | void (*request_completion)(struct hv_storvsc_request *)) | |
f82bd046 HJ |
852 | { |
853 | struct block_device_context *blkdev = blkvsc_req->dev; | |
f916a34d | 854 | struct vm_device *device_ctx = blkdev->device_ctx; |
8a280399 GKH |
855 | struct driver_context *driver_ctx = |
856 | driver_to_driver_context(device_ctx->device.driver); | |
857 | struct blkvsc_driver_context *blkvsc_drv_ctx = | |
858 | (struct blkvsc_driver_context *)driver_ctx; | |
859 | struct storvsc_driver_object *storvsc_drv_obj = | |
860 | &blkvsc_drv_ctx->drv_obj; | |
0b3f6834 | 861 | struct hv_storvsc_request *storvsc_req; |
8a280399 | 862 | int ret; |
f82bd046 | 863 | |
8a280399 GKH |
864 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " |
865 | "req %p type %s start_sector %lu count %ld offset %d " | |
866 | "len %d\n", blkvsc_req, | |
867 | (blkvsc_req->write) ? "WRITE" : "READ", | |
868 | (unsigned long) blkvsc_req->sector_start, | |
869 | blkvsc_req->sector_count, | |
870 | blkvsc_req->request.DataBuffer.Offset, | |
871 | blkvsc_req->request.DataBuffer.Length); | |
872 | #if 0 | |
873 | for (i = 0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++) { | |
874 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " | |
875 | "req %p pfn[%d] %llx\n", | |
876 | blkvsc_req, i, | |
877 | blkvsc_req->request.DataBuffer.PfnArray[i]); | |
878 | } | |
879 | #endif | |
f82bd046 HJ |
880 | |
881 | storvsc_req = &blkvsc_req->request; | |
8a280399 GKH |
882 | storvsc_req->Extension = (void *)((unsigned long)blkvsc_req + |
883 | sizeof(struct blkvsc_request)); | |
f82bd046 | 884 | |
8a280399 | 885 | storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; |
f82bd046 HJ |
886 | |
887 | storvsc_req->OnIOCompletion = request_completion; | |
888 | storvsc_req->Context = blkvsc_req; | |
889 | ||
890 | storvsc_req->Host = blkdev->port; | |
891 | storvsc_req->Bus = blkdev->path; | |
892 | storvsc_req->TargetId = blkdev->target; | |
454f18a9 | 893 | storvsc_req->LunId = 0; /* this is not really used at all */ |
f82bd046 HJ |
894 | |
895 | storvsc_req->CdbLen = blkvsc_req->cmd_len; | |
896 | storvsc_req->Cdb = blkvsc_req->cmnd; | |
897 | ||
898 | storvsc_req->SenseBuffer = blkvsc_req->sense_buffer; | |
899 | storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
900 | ||
8a280399 GKH |
901 | ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, |
902 | &blkvsc_req->request); | |
f82bd046 | 903 | if (ret == 0) |
f82bd046 | 904 | blkdev->num_outstanding_reqs++; |
f82bd046 HJ |
905 | |
906 | return ret; | |
907 | } | |
908 | ||
454f18a9 BP |
909 | /* |
910 | * We break the request into 1 or more blkvsc_requests and submit | |
911 | * them. If we cant submit them all, we put them on the | |
912 | * pending_list. The blkvsc_request() will work on the pending_list. | |
913 | */ | |
8a280399 GKH |
914 | static int blkvsc_do_request(struct block_device_context *blkdev, |
915 | struct request *req) | |
f82bd046 | 916 | { |
8a280399 GKH |
917 | struct bio *bio = NULL; |
918 | struct bio_vec *bvec = NULL; | |
919 | struct bio_vec *prev_bvec = NULL; | |
920 | struct blkvsc_request *blkvsc_req = NULL; | |
f82bd046 | 921 | struct blkvsc_request *tmp; |
8a280399 GKH |
922 | int databuf_idx = 0; |
923 | int seg_idx = 0; | |
f82bd046 HJ |
924 | sector_t start_sector; |
925 | unsigned long num_sectors = 0; | |
8a280399 GKH |
926 | int ret = 0; |
927 | int pending = 0; | |
928 | struct blkvsc_request_group *group = NULL; | |
f82bd046 | 929 | |
0686e4f4 | 930 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req, |
8a280399 | 931 | (unsigned long)blk_rq_pos(req)); |
f82bd046 | 932 | |
454f18a9 | 933 | /* Create a group to tie req to list of blkvsc_reqs */ |
8a280399 | 934 | group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); |
f82bd046 | 935 | if (!group) |
f82bd046 | 936 | return -ENOMEM; |
f82bd046 HJ |
937 | |
938 | INIT_LIST_HEAD(&group->blkvsc_req_list); | |
939 | group->outstanding = group->status = 0; | |
940 | ||
0fce4c2f | 941 | start_sector = blk_rq_pos(req); |
f82bd046 | 942 | |
454f18a9 | 943 | /* foreach bio in the request */ |
8a280399 GKH |
944 | if (req->bio) { |
945 | for (bio = req->bio; bio; bio = bio->bi_next) { | |
946 | /* | |
947 | * Map this bio into an existing or new storvsc request | |
948 | */ | |
949 | bio_for_each_segment(bvec, bio, seg_idx) { | |
950 | DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() " | |
951 | "- req %p bio %p bvec %p seg_idx %d " | |
952 | "databuf_idx %d\n", req, bio, bvec, | |
953 | seg_idx, databuf_idx); | |
954 | ||
955 | /* Get a new storvsc request */ | |
956 | /* 1st-time */ | |
957 | if ((!blkvsc_req) || | |
958 | (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) | |
959 | /* hole at the begin of page */ | |
960 | || (bvec->bv_offset != 0) || | |
961 | /* hold at the end of page */ | |
962 | (prev_bvec && | |
963 | (prev_bvec->bv_len != PAGE_SIZE))) { | |
964 | /* submit the prev one */ | |
965 | if (blkvsc_req) { | |
966 | blkvsc_req->sector_start = start_sector; | |
967 | sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
968 | ||
969 | blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
970 | blkvsc_init_rw(blkvsc_req); | |
f82bd046 HJ |
971 | } |
972 | ||
8a280399 GKH |
973 | /* |
974 | * Create new blkvsc_req to represent | |
975 | * the current bvec | |
976 | */ | |
977 | blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
978 | if (!blkvsc_req) { | |
979 | /* free up everything */ | |
980 | list_for_each_entry_safe( | |
981 | blkvsc_req, tmp, | |
982 | &group->blkvsc_req_list, | |
983 | req_entry) { | |
984 | list_del(&blkvsc_req->req_entry); | |
985 | kmem_cache_free(blkdev->request_pool, blkvsc_req); | |
986 | } | |
987 | ||
988 | kmem_cache_free(blkdev->request_pool, group); | |
989 | return -ENOMEM; | |
990 | } | |
f82bd046 | 991 | |
8a280399 GKH |
992 | memset(blkvsc_req, 0, |
993 | sizeof(struct blkvsc_request)); | |
f82bd046 | 994 | |
8a280399 GKH |
995 | blkvsc_req->dev = blkdev; |
996 | blkvsc_req->req = req; | |
997 | blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset; | |
998 | blkvsc_req->request.DataBuffer.Length = 0; | |
f82bd046 | 999 | |
8a280399 GKH |
1000 | /* Add to the group */ |
1001 | blkvsc_req->group = group; | |
1002 | blkvsc_req->group->outstanding++; | |
1003 | list_add_tail(&blkvsc_req->req_entry, | |
1004 | &blkvsc_req->group->blkvsc_req_list); | |
f82bd046 | 1005 | |
8a280399 GKH |
1006 | start_sector += num_sectors; |
1007 | num_sectors = 0; | |
1008 | databuf_idx = 0; | |
1009 | } | |
f82bd046 | 1010 | |
8a280399 GKH |
1011 | /* Add the curr bvec/segment to the curr blkvsc_req */ |
1012 | blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page); | |
1013 | blkvsc_req->request.DataBuffer.Length += bvec->bv_len; | |
f82bd046 | 1014 | |
8a280399 | 1015 | prev_bvec = bvec; |
f82bd046 | 1016 | |
8a280399 GKH |
1017 | databuf_idx++; |
1018 | num_sectors += bvec->bv_len >> 9; | |
f82bd046 | 1019 | |
8a280399 | 1020 | } /* bio_for_each_segment */ |
f82bd046 | 1021 | |
8a280399 GKH |
1022 | } /* rq_for_each_bio */ |
1023 | } | |
f82bd046 | 1024 | |
454f18a9 | 1025 | /* Handle the last one */ |
8a280399 GKH |
1026 | if (blkvsc_req) { |
1027 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n", | |
1028 | blkdev, req, blkvsc_req->group, | |
1029 | blkvsc_req->group->outstanding); | |
f82bd046 HJ |
1030 | |
1031 | blkvsc_req->sector_start = start_sector; | |
8a280399 GKH |
1032 | sector_div(blkvsc_req->sector_start, |
1033 | (blkdev->sector_size >> 9)); | |
f82bd046 | 1034 | |
8a280399 GKH |
1035 | blkvsc_req->sector_count = num_sectors / |
1036 | (blkdev->sector_size >> 9); | |
f82bd046 HJ |
1037 | |
1038 | blkvsc_init_rw(blkvsc_req); | |
1039 | } | |
1040 | ||
8a280399 GKH |
1041 | list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { |
1042 | if (pending) { | |
1043 | DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to " | |
1044 | "pending_list - blkvsc_req %p start_sect %lu" | |
1045 | " sect_count %ld (%lu %ld)\n", blkvsc_req, | |
1046 | (unsigned long)blkvsc_req->sector_start, | |
1047 | blkvsc_req->sector_count, | |
1048 | (unsigned long)start_sector, | |
1049 | (unsigned long)num_sectors); | |
1050 | ||
1051 | list_add_tail(&blkvsc_req->pend_entry, | |
1052 | &blkdev->pending_list); | |
1053 | } else { | |
1054 | ret = blkvsc_submit_request(blkvsc_req, | |
1055 | blkvsc_request_completion); | |
1056 | if (ret == -1) { | |
f82bd046 | 1057 | pending = 1; |
8a280399 GKH |
1058 | list_add_tail(&blkvsc_req->pend_entry, |
1059 | &blkdev->pending_list); | |
f82bd046 HJ |
1060 | } |
1061 | ||
8a280399 GKH |
1062 | DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p " |
1063 | "start_sect %lu sect_count %ld (%lu %ld) " | |
1064 | "ret %d\n", blkvsc_req, | |
1065 | (unsigned long)blkvsc_req->sector_start, | |
1066 | blkvsc_req->sector_count, | |
1067 | (unsigned long)start_sector, | |
1068 | num_sectors, ret); | |
f82bd046 HJ |
1069 | } |
1070 | } | |
1071 | ||
1072 | return pending; | |
1073 | } | |
1074 | ||
0b3f6834 | 1075 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request) |
f82bd046 | 1076 | { |
8a280399 GKH |
1077 | struct blkvsc_request *blkvsc_req = |
1078 | (struct blkvsc_request *)request->Context; | |
1079 | struct block_device_context *blkdev = | |
1080 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1081 | struct scsi_sense_hdr sense_hdr; |
1082 | ||
8a280399 GKH |
1083 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", |
1084 | blkvsc_req); | |
f82bd046 HJ |
1085 | |
1086 | blkdev->num_outstanding_reqs--; | |
1087 | ||
1088 | if (blkvsc_req->request.Status) | |
8a280399 GKH |
1089 | if (scsi_normalize_sense(blkvsc_req->sense_buffer, |
1090 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
f82bd046 | 1091 | scsi_print_sense_hdr("blkvsc", &sense_hdr); |
f82bd046 | 1092 | |
8a280399 | 1093 | blkvsc_req->cond = 1; |
f82bd046 HJ |
1094 | wake_up_interruptible(&blkvsc_req->wevent); |
1095 | } | |
1096 | ||
0b3f6834 | 1097 | static void blkvsc_request_completion(struct hv_storvsc_request *request) |
f82bd046 | 1098 | { |
8a280399 GKH |
1099 | struct blkvsc_request *blkvsc_req = |
1100 | (struct blkvsc_request *)request->Context; | |
1101 | struct block_device_context *blkdev = | |
1102 | (struct block_device_context *)blkvsc_req->dev; | |
f82bd046 HJ |
1103 | unsigned long flags; |
1104 | struct blkvsc_request *comp_req, *tmp; | |
1105 | ||
4e5166b5 | 1106 | /* ASSERT(blkvsc_req->group); */ |
f82bd046 | 1107 | |
8a280399 GKH |
1108 | DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s " |
1109 | "sect_start %lu sect_count %ld len %d group outstd %d " | |
1110 | "total outstd %d\n", | |
1111 | blkdev, blkvsc_req, blkvsc_req->group, | |
1112 | (blkvsc_req->write) ? "WRITE" : "READ", | |
1113 | (unsigned long)blkvsc_req->sector_start, | |
1114 | blkvsc_req->sector_count, | |
1115 | blkvsc_req->request.DataBuffer.Length, | |
1116 | blkvsc_req->group->outstanding, | |
1117 | blkdev->num_outstanding_reqs); | |
f82bd046 HJ |
1118 | |
1119 | spin_lock_irqsave(&blkdev->lock, flags); | |
1120 | ||
1121 | blkdev->num_outstanding_reqs--; | |
1122 | blkvsc_req->group->outstanding--; | |
1123 | ||
454f18a9 BP |
1124 | /* |
1125 | * Only start processing when all the blkvsc_reqs are | |
1126 | * completed. This guarantees no out-of-order blkvsc_req | |
1127 | * completion when calling end_that_request_first() | |
1128 | */ | |
8a280399 GKH |
1129 | if (blkvsc_req->group->outstanding == 0) { |
1130 | list_for_each_entry_safe(comp_req, tmp, | |
1131 | &blkvsc_req->group->blkvsc_req_list, | |
1132 | req_entry) { | |
1133 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
0686e4f4 | 1134 | "sect_start %lu sect_count %ld\n", |
8a280399 GKH |
1135 | comp_req, |
1136 | (unsigned long)comp_req->sector_start, | |
1137 | comp_req->sector_count); | |
f82bd046 HJ |
1138 | |
1139 | list_del(&comp_req->req_entry); | |
1140 | ||
8a280399 GKH |
1141 | if (!__blk_end_request(comp_req->req, |
1142 | (!comp_req->request.Status ? 0 : -EIO), | |
1143 | comp_req->sector_count * blkdev->sector_size)) { | |
1144 | /* | |
1145 | * All the sectors have been xferred ie the | |
1146 | * request is done | |
1147 | */ | |
1148 | DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", | |
1149 | comp_req->req); | |
1150 | kmem_cache_free(blkdev->request_pool, | |
1151 | comp_req->group); | |
f82bd046 | 1152 | } |
f82bd046 HJ |
1153 | |
1154 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1155 | } | |
1156 | ||
8a280399 | 1157 | if (!blkdev->shutting_down) { |
f82bd046 HJ |
1158 | blkvsc_do_pending_reqs(blkdev); |
1159 | blk_start_queue(blkdev->gd->queue); | |
1160 | blkvsc_request(blkdev->gd->queue); | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | spin_unlock_irqrestore(&blkdev->lock, flags); | |
1165 | } | |
1166 | ||
1167 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) | |
1168 | { | |
1169 | struct blkvsc_request *pend_req, *tmp; | |
1170 | struct blkvsc_request *comp_req, *tmp2; | |
1171 | ||
8a280399 | 1172 | int ret = 0; |
f82bd046 HJ |
1173 | |
1174 | DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()"); | |
1175 | ||
454f18a9 | 1176 | /* Flush the pending list first */ |
8a280399 GKH |
1177 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1178 | pend_entry) { | |
454f18a9 BP |
1179 | /* |
1180 | * The pend_req could be part of a partially completed | |
1181 | * request. If so, complete those req first until we | |
1182 | * hit the pend_req | |
1183 | */ | |
8a280399 GKH |
1184 | list_for_each_entry_safe(comp_req, tmp2, |
1185 | &pend_req->group->blkvsc_req_list, | |
1186 | req_entry) { | |
1187 | DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p " | |
0686e4f4 | 1188 | "sect_start %lu sect_count %ld\n", |
8a280399 GKH |
1189 | comp_req, |
1190 | (unsigned long) comp_req->sector_start, | |
1191 | comp_req->sector_count); | |
f82bd046 HJ |
1192 | |
1193 | if (comp_req == pend_req) | |
1194 | break; | |
1195 | ||
1196 | list_del(&comp_req->req_entry); | |
1197 | ||
8a280399 GKH |
1198 | if (comp_req->req) { |
1199 | ret = __blk_end_request(comp_req->req, | |
1200 | (!comp_req->request.Status ? 0 : -EIO), | |
1201 | comp_req->sector_count * | |
1202 | blkdev->sector_size); | |
ee350376 BP |
1203 | |
1204 | /* FIXME: shouldn't this do more than return? */ | |
1205 | if (ret) | |
1206 | goto out; | |
f82bd046 HJ |
1207 | } |
1208 | ||
1209 | kmem_cache_free(blkdev->request_pool, comp_req); | |
1210 | } | |
1211 | ||
8a280399 GKH |
1212 | DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n", |
1213 | pend_req); | |
f82bd046 HJ |
1214 | |
1215 | list_del(&pend_req->pend_entry); | |
1216 | ||
1217 | list_del(&pend_req->req_entry); | |
1218 | ||
8a280399 GKH |
1219 | if (comp_req->req) { |
1220 | if (!__blk_end_request(pend_req->req, -EIO, | |
1221 | pend_req->sector_count * | |
1222 | blkdev->sector_size)) { | |
1223 | /* | |
1224 | * All the sectors have been xferred ie the | |
1225 | * request is done | |
1226 | */ | |
1227 | DPRINT_DBG(BLKVSC_DRV, | |
1228 | "blkvsc_cancel_pending_reqs() - " | |
1229 | "req %p COMPLETED\n", pend_req->req); | |
1230 | kmem_cache_free(blkdev->request_pool, | |
1231 | pend_req->group); | |
1232 | } | |
f82bd046 HJ |
1233 | } |
1234 | ||
1235 | kmem_cache_free(blkdev->request_pool, pend_req); | |
1236 | } | |
1237 | ||
ee350376 | 1238 | out: |
f82bd046 HJ |
1239 | return ret; |
1240 | } | |
1241 | ||
1242 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) | |
1243 | { | |
1244 | struct blkvsc_request *pend_req, *tmp; | |
8a280399 | 1245 | int ret = 0; |
f82bd046 | 1246 | |
454f18a9 | 1247 | /* Flush the pending list first */ |
8a280399 GKH |
1248 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
1249 | pend_entry) { | |
1250 | DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", | |
1251 | pend_req); | |
f82bd046 | 1252 | |
8a280399 GKH |
1253 | ret = blkvsc_submit_request(pend_req, |
1254 | blkvsc_request_completion); | |
f82bd046 | 1255 | if (ret != 0) |
f82bd046 | 1256 | break; |
f82bd046 | 1257 | else |
f82bd046 | 1258 | list_del(&pend_req->pend_entry); |
f82bd046 HJ |
1259 | } |
1260 | ||
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | static void blkvsc_request(struct request_queue *queue) | |
1265 | { | |
1266 | struct block_device_context *blkdev = NULL; | |
1267 | struct request *req; | |
8a280399 | 1268 | int ret = 0; |
f82bd046 | 1269 | |
0686e4f4 | 1270 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); |
8a280399 | 1271 | while ((req = blk_peek_request(queue)) != NULL) { |
f82bd046 HJ |
1272 | DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req); |
1273 | ||
1274 | blkdev = req->rq_disk->private_data; | |
33659ebb | 1275 | if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS || |
8a280399 | 1276 | blkdev->media_not_present) { |
0fce4c2f | 1277 | __blk_end_request_cur(req, 0); |
f82bd046 HJ |
1278 | continue; |
1279 | } | |
1280 | ||
1281 | ret = blkvsc_do_pending_reqs(blkdev); | |
1282 | ||
8a280399 GKH |
1283 | if (ret != 0) { |
1284 | DPRINT_DBG(BLKVSC_DRV, | |
1285 | "- stop queue - pending_list not empty\n"); | |
f82bd046 HJ |
1286 | blk_stop_queue(queue); |
1287 | break; | |
1288 | } | |
1289 | ||
0fce4c2f | 1290 | blk_start_request(req); |
f82bd046 HJ |
1291 | |
1292 | ret = blkvsc_do_request(blkdev, req); | |
8a280399 | 1293 | if (ret > 0) { |
f82bd046 HJ |
1294 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n"); |
1295 | blk_stop_queue(queue); | |
1296 | break; | |
8a280399 | 1297 | } else if (ret < 0) { |
f82bd046 HJ |
1298 | DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n"); |
1299 | blk_requeue_request(queue, req); | |
1300 | blk_stop_queue(queue); | |
1301 | break; | |
1302 | } | |
1303 | } | |
1304 | } | |
1305 | ||
8a280399 | 1306 | static int blkvsc_open(struct block_device *bdev, fmode_t mode) |
f82bd046 | 1307 | { |
39635f7d | 1308 | struct block_device_context *blkdev = bdev->bd_disk->private_data; |
f82bd046 | 1309 | |
8a280399 GKH |
1310 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1311 | blkdev->gd->disk_name); | |
f82bd046 | 1312 | |
2a48fc0a | 1313 | mutex_lock(&blkvsc_mutex); |
f82bd046 HJ |
1314 | spin_lock(&blkdev->lock); |
1315 | ||
8a280399 | 1316 | if (!blkdev->users && blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1317 | spin_unlock(&blkdev->lock); |
39635f7d | 1318 | check_disk_change(bdev); |
f82bd046 HJ |
1319 | spin_lock(&blkdev->lock); |
1320 | } | |
1321 | ||
1322 | blkdev->users++; | |
1323 | ||
1324 | spin_unlock(&blkdev->lock); | |
2a48fc0a | 1325 | mutex_unlock(&blkvsc_mutex); |
f82bd046 HJ |
1326 | return 0; |
1327 | } | |
1328 | ||
77d2d9da | 1329 | static int blkvsc_release(struct gendisk *disk, fmode_t mode) |
f82bd046 | 1330 | { |
77d2d9da | 1331 | struct block_device_context *blkdev = disk->private_data; |
f82bd046 | 1332 | |
8a280399 GKH |
1333 | DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, |
1334 | blkdev->gd->disk_name); | |
f82bd046 | 1335 | |
2a48fc0a | 1336 | mutex_lock(&blkvsc_mutex); |
f82bd046 | 1337 | spin_lock(&blkdev->lock); |
8a280399 | 1338 | if (blkdev->users == 1) { |
f82bd046 HJ |
1339 | spin_unlock(&blkdev->lock); |
1340 | blkvsc_do_flush(blkdev); | |
1341 | spin_lock(&blkdev->lock); | |
1342 | } | |
1343 | ||
1344 | blkdev->users--; | |
1345 | ||
1346 | spin_unlock(&blkdev->lock); | |
2a48fc0a | 1347 | mutex_unlock(&blkvsc_mutex); |
f82bd046 HJ |
1348 | return 0; |
1349 | } | |
1350 | ||
1351 | static int blkvsc_media_changed(struct gendisk *gd) | |
1352 | { | |
1353 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
f82bd046 HJ |
1354 | return 1; |
1355 | } | |
1356 | ||
1357 | static int blkvsc_revalidate_disk(struct gendisk *gd) | |
1358 | { | |
1359 | struct block_device_context *blkdev = gd->private_data; | |
1360 | ||
1361 | DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1362 | ||
8a280399 | 1363 | if (blkdev->device_type == DVD_TYPE) { |
f82bd046 | 1364 | blkvsc_do_read_capacity(blkdev); |
8a280399 GKH |
1365 | set_capacity(blkdev->gd, blkdev->capacity * |
1366 | (blkdev->sector_size/512)); | |
0fce4c2f | 1367 | blk_queue_logical_block_size(gd->queue, blkdev->sector_size); |
f82bd046 HJ |
1368 | } |
1369 | return 0; | |
1370 | } | |
1371 | ||
bd1de709 | 1372 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) |
f82bd046 HJ |
1373 | { |
1374 | sector_t total_sectors = get_capacity(bd->bd_disk); | |
8a280399 GKH |
1375 | sector_t cylinder_times_heads = 0; |
1376 | sector_t temp = 0; | |
f82bd046 | 1377 | |
8a280399 GKH |
1378 | int sectors_per_track = 0; |
1379 | int heads = 0; | |
1380 | int cylinders = 0; | |
1381 | int rem = 0; | |
f82bd046 | 1382 | |
8a280399 GKH |
1383 | if (total_sectors > (65535 * 16 * 255)) |
1384 | total_sectors = (65535 * 16 * 255); | |
f82bd046 | 1385 | |
8a280399 GKH |
1386 | if (total_sectors >= (65535 * 16 * 63)) { |
1387 | sectors_per_track = 255; | |
1388 | heads = 16; | |
f82bd046 HJ |
1389 | |
1390 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1391 | /* sector_div stores the quotient in cylinder_times_heads */ |
1392 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
1393 | } else { | |
1394 | sectors_per_track = 17; | |
f82bd046 HJ |
1395 | |
1396 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1397 | /* sector_div stores the quotient in cylinder_times_heads */ |
1398 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
f82bd046 HJ |
1399 | |
1400 | temp = cylinder_times_heads + 1023; | |
8a280399 GKH |
1401 | /* sector_div stores the quotient in temp */ |
1402 | rem = sector_div(temp, 1024); | |
f82bd046 HJ |
1403 | |
1404 | heads = temp; | |
1405 | ||
8a280399 GKH |
1406 | if (heads < 4) |
1407 | heads = 4; | |
1408 | ||
f82bd046 | 1409 | |
8a280399 GKH |
1410 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
1411 | sectors_per_track = 31; | |
1412 | heads = 16; | |
f82bd046 HJ |
1413 | |
1414 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1415 | /* |
1416 | * sector_div stores the quotient in | |
1417 | * cylinder_times_heads | |
1418 | */ | |
1419 | rem = sector_div(cylinder_times_heads, | |
1420 | sectors_per_track); | |
1421 | } | |
f82bd046 | 1422 | |
8a280399 GKH |
1423 | if (cylinder_times_heads >= (heads * 1024)) { |
1424 | sectors_per_track = 63; | |
1425 | heads = 16; | |
f82bd046 HJ |
1426 | |
1427 | cylinder_times_heads = total_sectors; | |
8a280399 GKH |
1428 | /* |
1429 | * sector_div stores the quotient in | |
1430 | * cylinder_times_heads | |
1431 | */ | |
1432 | rem = sector_div(cylinder_times_heads, | |
1433 | sectors_per_track); | |
1434 | } | |
454f18a9 | 1435 | } |
f82bd046 HJ |
1436 | |
1437 | temp = cylinder_times_heads; | |
8a280399 GKH |
1438 | /* sector_div stores the quotient in temp */ |
1439 | rem = sector_div(temp, heads); | |
f82bd046 HJ |
1440 | cylinders = temp; |
1441 | ||
1442 | hg->heads = heads; | |
8a280399 GKH |
1443 | hg->sectors = sectors_per_track; |
1444 | hg->cylinders = cylinders; | |
f82bd046 | 1445 | |
8a280399 GKH |
1446 | DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1447 | sectors_per_track); | |
f82bd046 HJ |
1448 | |
1449 | return 0; | |
1450 | } | |
1451 | ||
dfe8b2d9 BP |
1452 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
1453 | unsigned cmd, unsigned long argument) | |
f82bd046 | 1454 | { |
b5788529 | 1455 | /* struct block_device_context *blkdev = bd->bd_disk->private_data; */ |
8a280399 | 1456 | int ret; |
f82bd046 | 1457 | |
8a280399 GKH |
1458 | switch (cmd) { |
1459 | /* | |
1460 | * TODO: I think there is certain format for HDIO_GET_IDENTITY rather | |
1461 | * than just a GUID. Commented it out for now. | |
1462 | */ | |
1463 | #if 0 | |
1464 | case HDIO_GET_IDENTITY: | |
f82bd046 | 1465 | DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); |
8a280399 GKH |
1466 | if (copy_to_user((void __user *)arg, blkdev->device_id, |
1467 | blkdev->device_id_len)) | |
f82bd046 | 1468 | ret = -EFAULT; |
8a280399 GKH |
1469 | break; |
1470 | #endif | |
f82bd046 HJ |
1471 | default: |
1472 | ret = -EINVAL; | |
1473 | break; | |
1474 | } | |
1475 | ||
1476 | return ret; | |
1477 | } | |
1478 | ||
f82bd046 HJ |
1479 | static int __init blkvsc_init(void) |
1480 | { | |
1481 | int ret; | |
1482 | ||
5afd06cc | 1483 | BUILD_BUG_ON(sizeof(sector_t) != 8); |
f82bd046 | 1484 | |
f82bd046 HJ |
1485 | DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing...."); |
1486 | ||
1487 | ret = blkvsc_drv_init(BlkVscInitialize); | |
1488 | ||
f82bd046 HJ |
1489 | return ret; |
1490 | } | |
1491 | ||
1492 | static void __exit blkvsc_exit(void) | |
1493 | { | |
f82bd046 | 1494 | blkvsc_drv_exit(); |
f82bd046 HJ |
1495 | } |
1496 | ||
8a280399 | 1497 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1498 | MODULE_VERSION(HV_DRV_VERSION); |
1ec28abb | 1499 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver"); |
f82bd046 HJ |
1500 | module_init(blkvsc_init); |
1501 | module_exit(blkvsc_exit); |