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3260 Serge 1
/*
2
 * Copyright © 2008 Intel Corporation
3
 *
4
 * Permission is hereby granted, free of charge, to any person obtaining a
5
 * copy of this software and associated documentation files (the "Software"),
6
 * to deal in the Software without restriction, including without limitation
7
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8
 * and/or sell copies of the Software, and to permit persons to whom the
9
 * Software is furnished to do so, subject to the following conditions:
10
 *
11
 * The above copyright notice and this permission notice (including the next
12
 * paragraph) shall be included in all copies or substantial portions of the
13
 * Software.
14
 *
15
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21
 * IN THE SOFTWARE.
22
 *
23
 * Authors:
24
 *    Eric Anholt 
25
 *
26
 */
27
 
28
#include 
29
#include 
30
#include 
4560 Serge 31
#include 
32
#include 
3260 Serge 33
#include 
34
#include 
35
#include 
36
#include 
4104 Serge 37
#include 
5271 serge 38
#include 
39
#include "drm_internal.h"
3260 Serge 40
 
41
/** @file drm_gem.c
42
 *
43
 * This file provides some of the base ioctls and library routines for
44
 * the graphics memory manager implemented by each device driver.
45
 *
46
 * Because various devices have different requirements in terms of
47
 * synchronization and migration strategies, implementing that is left up to
48
 * the driver, and all that the general API provides should be generic --
49
 * allocating objects, reading/writing data with the cpu, freeing objects.
50
 * Even there, platform-dependent optimizations for reading/writing data with
51
 * the CPU mean we'll likely hook those out to driver-specific calls.  However,
52
 * the DRI2 implementation wants to have at least allocate/mmap be generic.
53
 *
54
 * The goal was to have swap-backed object allocation managed through
55
 * struct file.  However, file descriptors as handles to a struct file have
56
 * two major failings:
57
 * - Process limits prevent more than 1024 or so being used at a time by
58
 *   default.
59
 * - Inability to allocate high fds will aggravate the X Server's select()
60
 *   handling, and likely that of many GL client applications as well.
61
 *
62
 * This led to a plan of using our own integer IDs (called handles, following
63
 * DRM terminology) to mimic fds, and implement the fd syscalls we need as
64
 * ioctls.  The objects themselves will still include the struct file so
65
 * that we can transition to fds if the required kernel infrastructure shows
66
 * up at a later date, and as our interface with shmfs for memory allocation.
67
 */
68
 
69
/*
70
 * We make up offsets for buffer objects so we can recognize them at
71
 * mmap time.
72
 */
73
 
74
/* pgoff in mmap is an unsigned long, so we need to make sure that
75
 * the faked up offset will fit
76
 */
77
 
78
#if BITS_PER_LONG == 64
79
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
80
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
81
#else
82
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
83
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
84
#endif
85
 
86
/**
5060 serge 87
 * drm_gem_init - Initialize the GEM device fields
88
 * @dev: drm_devic structure to initialize
3260 Serge 89
 */
90
int
91
drm_gem_init(struct drm_device *dev)
92
{
4560 Serge 93
	struct drm_vma_offset_manager *vma_offset_manager;
3260 Serge 94
 
4104 Serge 95
	mutex_init(&dev->object_name_lock);
3260 Serge 96
	idr_init(&dev->object_name_idr);
97
 
4560 Serge 98
	vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL);
99
	if (!vma_offset_manager) {
3260 Serge 100
		DRM_ERROR("out of memory\n");
101
		return -ENOMEM;
102
	}
103
 
4560 Serge 104
	dev->vma_offset_manager = vma_offset_manager;
105
	drm_vma_offset_manager_init(vma_offset_manager,
4104 Serge 106
				    DRM_FILE_PAGE_OFFSET_START,
4075 Serge 107
		    DRM_FILE_PAGE_OFFSET_SIZE);
3260 Serge 108
 
109
	return 0;
110
}
111
 
112
void
113
drm_gem_destroy(struct drm_device *dev)
114
{
115
 
4560 Serge 116
	drm_vma_offset_manager_destroy(dev->vma_offset_manager);
117
	kfree(dev->vma_offset_manager);
118
	dev->vma_offset_manager = NULL;
3260 Serge 119
}
120
 
121
/**
5060 serge 122
 * drm_gem_object_init - initialize an allocated shmem-backed GEM object
123
 * @dev: drm_device the object should be initialized for
124
 * @obj: drm_gem_object to initialize
125
 * @size: object size
126
 *
3260 Serge 127
 * Initialize an already allocated GEM object of the specified size with
128
 * shmfs backing store.
129
 */
130
int drm_gem_object_init(struct drm_device *dev,
131
			struct drm_gem_object *obj, size_t size)
132
{
4104 Serge 133
	struct file *filp;
3260 Serge 134
 
4560 Serge 135
	drm_gem_private_object_init(dev, obj, size);
136
 
4104 Serge 137
	filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
138
	if (IS_ERR(filp))
139
		return PTR_ERR(filp);
3260 Serge 140
 
4104 Serge 141
	obj->filp = filp;
3260 Serge 142
 
143
	return 0;
144
}
145
EXPORT_SYMBOL(drm_gem_object_init);
146
 
147
/**
5271 serge 148
 * drm_gem_private_object_init - initialize an allocated private GEM object
5060 serge 149
 * @dev: drm_device the object should be initialized for
150
 * @obj: drm_gem_object to initialize
151
 * @size: object size
152
 *
3260 Serge 153
 * Initialize an already allocated GEM object of the specified size with
154
 * no GEM provided backing store. Instead the caller is responsible for
155
 * backing the object and handling it.
156
 */
4104 Serge 157
void drm_gem_private_object_init(struct drm_device *dev,
3260 Serge 158
			struct drm_gem_object *obj, size_t size)
159
{
160
	BUG_ON((size & (PAGE_SIZE - 1)) != 0);
161
 
162
	obj->dev = dev;
163
	obj->filp = NULL;
164
 
165
	kref_init(&obj->refcount);
4104 Serge 166
	obj->handle_count = 0;
3260 Serge 167
	obj->size = size;
4104 Serge 168
	drm_vma_node_reset(&obj->vma_node);
3260 Serge 169
}
170
EXPORT_SYMBOL(drm_gem_private_object_init);
171
 
172
/**
5271 serge 173
 * drm_gem_object_handle_free - release resources bound to userspace handles
5060 serge 174
 * @obj: GEM object to clean up.
175
 *
4104 Serge 176
 * Called after the last handle to the object has been closed
177
 *
178
 * Removes any name for the object. Note that this must be
179
 * called before drm_gem_object_free or we'll be touching
180
 * freed memory
181
 */
182
static void drm_gem_object_handle_free(struct drm_gem_object *obj)
183
{
184
	struct drm_device *dev = obj->dev;
185
 
186
	/* Remove any name for this object */
187
	if (obj->name) {
188
		idr_remove(&dev->object_name_idr, obj->name);
189
		obj->name = 0;
190
	}
191
}
192
 
193
 
194
static void
195
drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
196
{
197
	if (WARN_ON(obj->handle_count == 0))
198
		return;
199
 
200
	/*
201
	* Must bump handle count first as this may be the last
202
	* ref, in which case the object would disappear before we
203
	* checked for a name
204
	*/
205
 
206
	mutex_lock(&obj->dev->object_name_lock);
207
	if (--obj->handle_count == 0) {
208
		drm_gem_object_handle_free(obj);
209
	}
210
	mutex_unlock(&obj->dev->object_name_lock);
211
 
212
	drm_gem_object_unreference_unlocked(obj);
213
}
214
 
215
/**
5060 serge 216
 * drm_gem_handle_delete - deletes the given file-private handle
217
 * @filp: drm file-private structure to use for the handle look up
218
 * @handle: userspace handle to delete
219
 *
220
 * Removes the GEM handle from the @filp lookup table and if this is the last
221
 * handle also cleans up linked resources like GEM names.
3260 Serge 222
 */
223
int
224
drm_gem_handle_delete(struct drm_file *filp, u32 handle)
225
{
226
	struct drm_device *dev;
227
	struct drm_gem_object *obj;
228
 
229
	/* This is gross. The idr system doesn't let us try a delete and
230
	 * return an error code.  It just spews if you fail at deleting.
231
	 * So, we have to grab a lock around finding the object and then
232
	 * doing the delete on it and dropping the refcount, or the user
233
	 * could race us to double-decrement the refcount and cause a
234
	 * use-after-free later.  Given the frequency of our handle lookups,
235
	 * we may want to use ida for number allocation and a hash table
236
	 * for the pointers, anyway.
237
	 */
238
	spin_lock(&filp->table_lock);
239
 
240
	/* Check if we currently have a reference on the object */
241
	obj = idr_find(&filp->object_idr, handle);
242
	if (obj == NULL) {
243
		spin_unlock(&filp->table_lock);
244
		return -EINVAL;
245
	}
246
	dev = obj->dev;
247
 
248
	/* Release reference and decrement refcount. */
249
	idr_remove(&filp->object_idr, handle);
250
	spin_unlock(&filp->table_lock);
251
 
4560 Serge 252
//	drm_vma_node_revoke(&obj->vma_node, filp->filp);
3260 Serge 253
 
254
	if (dev->driver->gem_close_object)
255
		dev->driver->gem_close_object(obj, filp);
256
	drm_gem_object_handle_unreference_unlocked(obj);
257
 
258
	return 0;
259
}
260
EXPORT_SYMBOL(drm_gem_handle_delete);
261
 
262
/**
4560 Serge 263
 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
5060 serge 264
 * @file: drm file-private structure to remove the dumb handle from
265
 * @dev: corresponding drm_device
266
 * @handle: the dumb handle to remove
4560 Serge 267
 *
268
 * This implements the ->dumb_destroy kms driver callback for drivers which use
269
 * gem to manage their backing storage.
270
 */
271
int drm_gem_dumb_destroy(struct drm_file *file,
272
			 struct drm_device *dev,
273
			 uint32_t handle)
274
{
275
	return drm_gem_handle_delete(file, handle);
276
}
277
EXPORT_SYMBOL(drm_gem_dumb_destroy);
278
 
4539 Serge 279
/**
280
 * drm_gem_handle_create_tail - internal functions to create a handle
5060 serge 281
 * @file_priv: drm file-private structure to register the handle for
282
 * @obj: object to register
5271 serge 283
 * @handlep: pointer to return the created handle to the caller
4539 Serge 284
 *
285
 * This expects the dev->object_name_lock to be held already and will drop it
286
 * before returning. Used to avoid races in establishing new handles when
287
 * importing an object from either an flink name or a dma-buf.
3260 Serge 288
 */
289
int
4104 Serge 290
drm_gem_handle_create_tail(struct drm_file *file_priv,
3260 Serge 291
		       struct drm_gem_object *obj,
292
		       u32 *handlep)
293
{
294
	struct drm_device *dev = obj->dev;
295
	int ret;
296
 
4104 Serge 297
	WARN_ON(!mutex_is_locked(&dev->object_name_lock));
298
 
3260 Serge 299
	/*
3480 Serge 300
	 * Get the user-visible handle using idr.  Preload and perform
301
	 * allocation under our spinlock.
3260 Serge 302
	 */
3480 Serge 303
	idr_preload(GFP_KERNEL);
304
	spin_lock(&file_priv->table_lock);
3260 Serge 305
 
3480 Serge 306
	ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);
4104 Serge 307
	drm_gem_object_reference(obj);
308
	obj->handle_count++;
3260 Serge 309
	spin_unlock(&file_priv->table_lock);
3480 Serge 310
	idr_preload_end();
4104 Serge 311
	mutex_unlock(&dev->object_name_lock);
312
	if (ret < 0) {
313
		drm_gem_object_handle_unreference_unlocked(obj);
3260 Serge 314
		return ret;
4104 Serge 315
	}
3480 Serge 316
	*handlep = ret;
3260 Serge 317
 
4560 Serge 318
//	ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
319
//	if (ret) {
320
//		drm_gem_handle_delete(file_priv, *handlep);
321
//		return ret;
322
//	}
323
 
3260 Serge 324
	if (dev->driver->gem_open_object) {
325
		ret = dev->driver->gem_open_object(obj, file_priv);
326
		if (ret) {
327
			drm_gem_handle_delete(file_priv, *handlep);
328
			return ret;
329
		}
330
	}
331
 
332
	return 0;
333
}
4104 Serge 334
 
335
/**
5271 serge 336
 * drm_gem_handle_create - create a gem handle for an object
5060 serge 337
 * @file_priv: drm file-private structure to register the handle for
338
 * @obj: object to register
339
 * @handlep: pionter to return the created handle to the caller
340
 *
4104 Serge 341
 * Create a handle for this object. This adds a handle reference
342
 * to the object, which includes a regular reference count. Callers
343
 * will likely want to dereference the object afterwards.
344
 */
5271 serge 345
int drm_gem_handle_create(struct drm_file *file_priv,
4104 Serge 346
		       struct drm_gem_object *obj,
347
		       u32 *handlep)
348
{
349
	mutex_lock(&obj->dev->object_name_lock);
350
 
351
	return drm_gem_handle_create_tail(file_priv, obj, handlep);
352
}
3260 Serge 353
EXPORT_SYMBOL(drm_gem_handle_create);
354
 
4560 Serge 355
#if 0
3260 Serge 356
/**
357
 * drm_gem_free_mmap_offset - release a fake mmap offset for an object
358
 * @obj: obj in question
359
 *
360
 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
361
 */
362
void
363
drm_gem_free_mmap_offset(struct drm_gem_object *obj)
364
{
365
	struct drm_device *dev = obj->dev;
366
 
4560 Serge 367
	drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node);
3260 Serge 368
}
369
EXPORT_SYMBOL(drm_gem_free_mmap_offset);
370
 
371
/**
4104 Serge 372
 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
3260 Serge 373
 * @obj: obj in question
4104 Serge 374
 * @size: the virtual size
3260 Serge 375
 *
376
 * GEM memory mapping works by handing back to userspace a fake mmap offset
377
 * it can use in a subsequent mmap(2) call.  The DRM core code then looks
378
 * up the object based on the offset and sets up the various memory mapping
379
 * structures.
380
 *
4104 Serge 381
 * This routine allocates and attaches a fake offset for @obj, in cases where
382
 * the virtual size differs from the physical size (ie. obj->size).  Otherwise
383
 * just use drm_gem_create_mmap_offset().
3260 Serge 384
 */
385
int
4104 Serge 386
drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
3260 Serge 387
{
388
	struct drm_device *dev = obj->dev;
389
 
4560 Serge 390
	return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node,
391
				  size / PAGE_SIZE);
392
}
393
EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
3260 Serge 394
 
4560 Serge 395
/**
396
 * drm_gem_create_mmap_offset - create a fake mmap offset for an object
397
 * @obj: obj in question
398
 *
399
 * GEM memory mapping works by handing back to userspace a fake mmap offset
400
 * it can use in a subsequent mmap(2) call.  The DRM core code then looks
401
 * up the object based on the offset and sets up the various memory mapping
402
 * structures.
403
 *
404
 * This routine allocates and attaches a fake offset for @obj.
405
 */
406
int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
407
{
408
	return drm_gem_create_mmap_offset_size(obj, obj->size);
409
}
410
EXPORT_SYMBOL(drm_gem_create_mmap_offset);
3260 Serge 411
 
4560 Serge 412
/**
413
 * drm_gem_get_pages - helper to allocate backing pages for a GEM object
414
 * from shmem
415
 * @obj: obj in question
5060 serge 416
 *
417
 * This reads the page-array of the shmem-backing storage of the given gem
418
 * object. An array of pages is returned. If a page is not allocated or
419
 * swapped-out, this will allocate/swap-in the required pages. Note that the
420
 * whole object is covered by the page-array and pinned in memory.
421
 *
422
 * Use drm_gem_put_pages() to release the array and unpin all pages.
423
 *
424
 * This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()).
425
 * If you require other GFP-masks, you have to do those allocations yourself.
426
 *
427
 * Note that you are not allowed to change gfp-zones during runtime. That is,
428
 * shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as
429
 * set during initialization. If you have special zone constraints, set them
430
 * after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care
431
 * to keep pages in the required zone during swap-in.
4560 Serge 432
 */
5060 serge 433
struct page **drm_gem_get_pages(struct drm_gem_object *obj)
4560 Serge 434
{
435
	struct address_space *mapping;
436
	struct page *p, **pages;
437
	int i, npages;
3260 Serge 438
 
4560 Serge 439
	/* This is the shared memory object that backs the GEM resource */
5060 serge 440
	mapping = file_inode(obj->filp)->i_mapping;
3260 Serge 441
 
4560 Serge 442
	/* We already BUG_ON() for non-page-aligned sizes in
443
	 * drm_gem_object_init(), so we should never hit this unless
444
	 * driver author is doing something really wrong:
445
	 */
446
	WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
3260 Serge 447
 
4560 Serge 448
	npages = obj->size >> PAGE_SHIFT;
449
 
450
	pages = drm_malloc_ab(npages, sizeof(struct page *));
451
	if (pages == NULL)
452
		return ERR_PTR(-ENOMEM);
453
 
454
	for (i = 0; i < npages; i++) {
5060 serge 455
		p = shmem_read_mapping_page(mapping, i);
4560 Serge 456
		if (IS_ERR(p))
457
			goto fail;
458
		pages[i] = p;
459
 
5060 serge 460
		/* Make sure shmem keeps __GFP_DMA32 allocated pages in the
461
		 * correct region during swapin. Note that this requires
462
		 * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping)
463
		 * so shmem can relocate pages during swapin if required.
4560 Serge 464
		 */
5060 serge 465
		BUG_ON((mapping_gfp_mask(mapping) & __GFP_DMA32) &&
4560 Serge 466
				(page_to_pfn(p) >= 0x00100000UL));
3260 Serge 467
	}
468
 
4560 Serge 469
	return pages;
3260 Serge 470
 
4560 Serge 471
fail:
472
	while (i--)
473
		page_cache_release(pages[i]);
3260 Serge 474
 
4560 Serge 475
	drm_free_large(pages);
476
	return ERR_CAST(p);
3260 Serge 477
}
4560 Serge 478
EXPORT_SYMBOL(drm_gem_get_pages);
479
 
480
/**
481
 * drm_gem_put_pages - helper to free backing pages for a GEM object
482
 * @obj: obj in question
483
 * @pages: pages to free
484
 * @dirty: if true, pages will be marked as dirty
485
 * @accessed: if true, the pages will be marked as accessed
486
 */
487
void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
488
		bool dirty, bool accessed)
489
{
490
	int i, npages;
491
 
492
	/* We already BUG_ON() for non-page-aligned sizes in
493
	 * drm_gem_object_init(), so we should never hit this unless
494
	 * driver author is doing something really wrong:
495
	 */
496
	WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
497
 
498
	npages = obj->size >> PAGE_SHIFT;
499
 
500
	for (i = 0; i < npages; i++) {
501
		if (dirty)
502
			set_page_dirty(pages[i]);
503
 
504
		if (accessed)
505
			mark_page_accessed(pages[i]);
506
 
507
		/* Undo the reference we took when populating the table */
508
		page_cache_release(pages[i]);
509
	}
510
 
511
	drm_free_large(pages);
512
}
513
EXPORT_SYMBOL(drm_gem_put_pages);
3260 Serge 514
#endif
515
 
516
/** Returns a reference to the object named by the handle. */
517
struct drm_gem_object *
518
drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
519
		      u32 handle)
520
{
521
	struct drm_gem_object *obj;
522
 
523
	spin_lock(&filp->table_lock);
524
 
525
	/* Check if we currently have a reference on the object */
526
	obj = idr_find(&filp->object_idr, handle);
527
	if (obj == NULL) {
528
		spin_unlock(&filp->table_lock);
529
		return NULL;
530
	}
531
 
532
	drm_gem_object_reference(obj);
533
 
534
	spin_unlock(&filp->table_lock);
535
 
536
	return obj;
537
}
538
EXPORT_SYMBOL(drm_gem_object_lookup);
539
 
540
/**
5060 serge 541
 * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl
542
 * @dev: drm_device
543
 * @data: ioctl data
544
 * @file_priv: drm file-private structure
545
 *
3260 Serge 546
 * Releases the handle to an mm object.
547
 */
548
int
549
drm_gem_close_ioctl(struct drm_device *dev, void *data,
550
		    struct drm_file *file_priv)
551
{
552
	struct drm_gem_close *args = data;
553
	int ret;
554
 
5271 serge 555
	if (!drm_core_check_feature(dev, DRIVER_GEM))
5060 serge 556
		return -ENODEV;
557
 
3260 Serge 558
	ret = drm_gem_handle_delete(file_priv, args->handle);
559
 
560
	return ret;
561
}
562
 
563
/**
5060 serge 564
 * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl
565
 * @dev: drm_device
566
 * @data: ioctl data
567
 * @file_priv: drm file-private structure
568
 *
3260 Serge 569
 * Create a global name for an object, returning the name.
570
 *
571
 * Note that the name does not hold a reference; when the object
572
 * is freed, the name goes away.
573
 */
574
int
575
drm_gem_flink_ioctl(struct drm_device *dev, void *data,
576
		    struct drm_file *file_priv)
577
{
578
	struct drm_gem_flink *args = data;
579
	struct drm_gem_object *obj;
580
	int ret;
581
 
5271 serge 582
	if (!drm_core_check_feature(dev, DRIVER_GEM))
3260 Serge 583
		return -ENODEV;
584
 
585
	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
586
	if (obj == NULL)
587
		return -ENOENT;
588
 
4104 Serge 589
	mutex_lock(&dev->object_name_lock);
3480 Serge 590
	idr_preload(GFP_KERNEL);
4104 Serge 591
	/* prevent races with concurrent gem_close. */
592
	if (obj->handle_count == 0) {
593
		ret = -ENOENT;
594
		goto err;
595
	}
596
 
3260 Serge 597
	if (!obj->name) {
3480 Serge 598
		ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT);
599
		if (ret < 0)
3260 Serge 600
			goto err;
601
 
4075 Serge 602
		obj->name = ret;
603
	}
604
 
3260 Serge 605
		args->name = (uint64_t) obj->name;
606
		ret = 0;
607
 
608
err:
4075 Serge 609
	idr_preload_end();
4104 Serge 610
	mutex_unlock(&dev->object_name_lock);
3260 Serge 611
	drm_gem_object_unreference_unlocked(obj);
612
	return ret;
613
}
614
 
615
/**
5060 serge 616
 * drm_gem_open - implementation of the GEM_OPEN ioctl
617
 * @dev: drm_device
618
 * @data: ioctl data
619
 * @file_priv: drm file-private structure
620
 *
3260 Serge 621
 * Open an object using the global name, returning a handle and the size.
622
 *
623
 * This handle (of course) holds a reference to the object, so the object
624
 * will not go away until the handle is deleted.
625
 */
626
int
627
drm_gem_open_ioctl(struct drm_device *dev, void *data,
628
		   struct drm_file *file_priv)
629
{
630
	struct drm_gem_open *args = data;
631
	struct drm_gem_object *obj;
632
	int ret;
633
	u32 handle;
634
 
5271 serge 635
	if (!drm_core_check_feature(dev, DRIVER_GEM))
3260 Serge 636
		return -ENODEV;
637
 
4104 Serge 638
	mutex_lock(&dev->object_name_lock);
3260 Serge 639
	obj = idr_find(&dev->object_name_idr, (int) args->name);
4104 Serge 640
	if (obj) {
3260 Serge 641
		drm_gem_object_reference(obj);
4104 Serge 642
	} else {
643
		mutex_unlock(&dev->object_name_lock);
3260 Serge 644
		return -ENOENT;
4104 Serge 645
	}
3260 Serge 646
 
4104 Serge 647
	/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
648
	ret = drm_gem_handle_create_tail(file_priv, obj, &handle);
3260 Serge 649
	drm_gem_object_unreference_unlocked(obj);
650
	if (ret)
651
		return ret;
652
 
653
	args->handle = handle;
654
	args->size = obj->size;
655
 
656
	return 0;
657
}
658
 
4246 Serge 659
#if 0
3260 Serge 660
/**
5060 serge 661
 * gem_gem_open - initalizes GEM file-private structures at devnode open time
662
 * @dev: drm_device which is being opened by userspace
663
 * @file_private: drm file-private structure to set up
664
 *
3260 Serge 665
 * Called at device open time, sets up the structure for handling refcounting
666
 * of mm objects.
667
 */
668
void
669
drm_gem_open(struct drm_device *dev, struct drm_file *file_private)
670
{
671
	idr_init(&file_private->object_idr);
672
	spin_lock_init(&file_private->table_lock);
673
}
674
 
5060 serge 675
/*
3260 Serge 676
 * Called at device close to release the file's
677
 * handle references on objects.
678
 */
679
static int
680
drm_gem_object_release_handle(int id, void *ptr, void *data)
681
{
682
	struct drm_file *file_priv = data;
683
	struct drm_gem_object *obj = ptr;
684
	struct drm_device *dev = obj->dev;
685
 
4104 Serge 686
	drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
3260 Serge 687
 
688
	if (dev->driver->gem_close_object)
689
		dev->driver->gem_close_object(obj, file_priv);
690
 
691
	drm_gem_object_handle_unreference_unlocked(obj);
692
 
693
	return 0;
694
}
695
 
696
/**
5060 serge 697
 * drm_gem_release - release file-private GEM resources
698
 * @dev: drm_device which is being closed by userspace
699
 * @file_private: drm file-private structure to clean up
700
 *
3260 Serge 701
 * Called at close time when the filp is going away.
702
 *
703
 * Releases any remaining references on objects by this filp.
704
 */
705
void
706
drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
707
{
708
	idr_for_each(&file_private->object_idr,
709
		     &drm_gem_object_release_handle, file_private);
710
	idr_destroy(&file_private->object_idr);
711
}
712
#endif
713
 
714
void
715
drm_gem_object_release(struct drm_gem_object *obj)
716
{
5060 serge 717
	WARN_ON(obj->dma_buf);
718
 
3260 Serge 719
	if (obj->filp)
720
	    free(obj->filp);
721
}
722
EXPORT_SYMBOL(drm_gem_object_release);
723
 
724
/**
5060 serge 725
 * drm_gem_object_free - free a GEM object
726
 * @kref: kref of the object to free
727
 *
3260 Serge 728
 * Called after the last reference to the object has been lost.
729
 * Must be called holding struct_ mutex
730
 *
731
 * Frees the object
732
 */
733
void
734
drm_gem_object_free(struct kref *kref)
735
{
736
	struct drm_gem_object *obj = (struct drm_gem_object *) kref;
737
	struct drm_device *dev = obj->dev;
738
 
739
	BUG_ON(!mutex_is_locked(&dev->struct_mutex));
740
 
741
	if (dev->driver->gem_free_object != NULL)
742
		dev->driver->gem_free_object(obj);
743
}
744
EXPORT_SYMBOL(drm_gem_object_free);
745
 
746
 
747
#if 0
748
void drm_gem_vm_open(struct vm_area_struct *vma)
749
{
750
	struct drm_gem_object *obj = vma->vm_private_data;
751
 
752
	drm_gem_object_reference(obj);
753
 
754
	mutex_lock(&obj->dev->struct_mutex);
755
	drm_vm_open_locked(obj->dev, vma);
756
	mutex_unlock(&obj->dev->struct_mutex);
757
}
758
EXPORT_SYMBOL(drm_gem_vm_open);
759
 
760
void drm_gem_vm_close(struct vm_area_struct *vma)
761
{
762
	struct drm_gem_object *obj = vma->vm_private_data;
763
	struct drm_device *dev = obj->dev;
764
 
765
	mutex_lock(&dev->struct_mutex);
766
	drm_vm_close_locked(obj->dev, vma);
767
	drm_gem_object_unreference(obj);
768
	mutex_unlock(&dev->struct_mutex);
769
}
770
EXPORT_SYMBOL(drm_gem_vm_close);
771
 
772
#endif
773