aboutsummaryrefslogtreecommitdiff
path: root/include/drm/drm_drv.h
blob: 827838e0a97e6c2d2f50ae92a2715a227919ce29 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * Copyright (c) 2009-2010, Code Aurora Forum.
 * Copyright 2016 Intel Corp.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef _DRM_DRV_H_
#define _DRM_DRV_H_

#include <linux/list.h>
#include <linux/irqreturn.h>

#include <drm/drm_device.h>

struct drm_file;
struct drm_gem_object;
struct drm_master;
struct drm_minor;
struct dma_buf;
struct dma_buf_attachment;
struct drm_display_mode;
struct drm_mode_create_dumb;
struct drm_printer;
struct sg_table;

/**
 * enum drm_driver_feature - feature flags
 *
 * See &drm_driver.driver_features, drm_device.driver_features and
 * drm_core_check_feature().
 */
enum drm_driver_feature {
	/**
	 * @DRIVER_GEM:
	 *
	 * Driver use the GEM memory manager. This should be set for all modern
	 * drivers.
	 */
	DRIVER_GEM			= BIT(0),
	/**
	 * @DRIVER_MODESET:
	 *
	 * Driver supports mode setting interfaces (KMS).
	 */
	DRIVER_MODESET			= BIT(1),
	/**
	 * @DRIVER_RENDER:
	 *
	 * Driver supports dedicated render nodes. See also the :ref:`section on
	 * render nodes <drm_render_node>` for details.
	 */
	DRIVER_RENDER			= BIT(3),
	/**
	 * @DRIVER_ATOMIC:
	 *
	 * Driver supports the full atomic modesetting userspace API. Drivers
	 * which only use atomic internally, but do not the support the full
	 * userspace API (e.g. not all properties converted to atomic, or
	 * multi-plane updates are not guaranteed to be tear-free) should not
	 * set this flag.
	 */
	DRIVER_ATOMIC			= BIT(4),
	/**
	 * @DRIVER_SYNCOBJ:
	 *
	 * Driver supports &drm_syncobj for explicit synchronization of command
	 * submission.
	 */
	DRIVER_SYNCOBJ                  = BIT(5),
	/**
	 * @DRIVER_SYNCOBJ_TIMELINE:
	 *
	 * Driver supports the timeline flavor of &drm_syncobj for explicit
	 * synchronization of command submission.
	 */
	DRIVER_SYNCOBJ_TIMELINE         = BIT(6),

	/* IMPORTANT: Below are all the legacy flags, add new ones above. */

	/**
	 * @DRIVER_USE_AGP:
	 *
	 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
	 * AGP resources. New drivers don't need this.
	 */
	DRIVER_USE_AGP			= BIT(25),
	/**
	 * @DRIVER_LEGACY:
	 *
	 * Denote a legacy driver using shadow attach. Do not use.
	 */
	DRIVER_LEGACY			= BIT(26),
	/**
	 * @DRIVER_PCI_DMA:
	 *
	 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
	 * will be enabled. Only for legacy drivers. Do not use.
	 */
	DRIVER_PCI_DMA			= BIT(27),
	/**
	 * @DRIVER_SG:
	 *
	 * Driver can perform scatter/gather DMA, allocation and mapping of
	 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
	 * not use.
	 */
	DRIVER_SG			= BIT(28),

	/**
	 * @DRIVER_HAVE_DMA:
	 *
	 * Driver supports DMA, the userspace DMA API will be supported. Only
	 * for legacy drivers. Do not use.
	 */
	DRIVER_HAVE_DMA			= BIT(29),
	/**
	 * @DRIVER_HAVE_IRQ:
	 *
	 * Legacy irq support. Only for legacy drivers. Do not use.
	 *
	 * New drivers can either use the drm_irq_install() and
	 * drm_irq_uninstall() helper functions, or roll their own irq support
	 * code by calling request_irq() directly.
	 */
	DRIVER_HAVE_IRQ			= BIT(30),
	/**
	 * @DRIVER_KMS_LEGACY_CONTEXT:
	 *
	 * Used only by nouveau for backwards compatibility with existing
	 * userspace.  Do not use.
	 */
	DRIVER_KMS_LEGACY_CONTEXT	= BIT(31),
};

/**
 * struct drm_driver - DRM driver structure
 *
 * This structure represent the common code for a family of cards. There will be
 * one &struct drm_device for each card present in this family. It contains lots
 * of vfunc entries, and a pile of those probably should be moved to more
 * appropriate places like &drm_mode_config_funcs or into a new operations
 * structure for GEM drivers.
 */
struct drm_driver {
	/**
	 * @load:
	 *
	 * Backward-compatible driver callback to complete initialization steps
	 * after the driver is registered.  For this reason, may suffer from
	 * race conditions and its use is deprecated for new drivers.  It is
	 * therefore only supported for existing drivers not yet converted to
	 * the new scheme.  See devm_drm_dev_alloc() and drm_dev_register() for
	 * proper and race-free way to set up a &struct drm_device.
	 *
	 * This is deprecated, do not use!
	 *
	 * Returns:
	 *
	 * Zero on success, non-zero value on failure.
	 */
	int (*load) (struct drm_device *, unsigned long flags);

	/**
	 * @open:
	 *
	 * Driver callback when a new &struct drm_file is opened. Useful for
	 * setting up driver-private data structures like buffer allocators,
	 * execution contexts or similar things. Such driver-private resources
	 * must be released again in @postclose.
	 *
	 * Since the display/modeset side of DRM can only be owned by exactly
	 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
	 * there should never be a need to set up any modeset related resources
	 * in this callback. Doing so would be a driver design bug.
	 *
	 * Returns:
	 *
	 * 0 on success, a negative error code on failure, which will be
	 * promoted to userspace as the result of the open() system call.
	 */
	int (*open) (struct drm_device *, struct drm_file *);

	/**
	 * @postclose:
	 *
	 * One of the driver callbacks when a new &struct drm_file is closed.
	 * Useful for tearing down driver-private data structures allocated in
	 * @open like buffer allocators, execution contexts or similar things.
	 *
	 * Since the display/modeset side of DRM can only be owned by exactly
	 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
	 * there should never be a need to tear down any modeset related
	 * resources in this callback. Doing so would be a driver design bug.
	 */
	void (*postclose) (struct drm_device *, struct drm_file *);

	/**
	 * @lastclose:
	 *
	 * Called when the last &struct drm_file has been closed and there's
	 * currently no userspace client for the &struct drm_device.
	 *
	 * Modern drivers should only use this to force-restore the fbdev
	 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
	 * Anything else would indicate there's something seriously wrong.
	 * Modern drivers can also use this to execute delayed power switching
	 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
	 * infrastructure.
	 *
	 * This is called after @postclose hook has been called.
	 *
	 * NOTE:
	 *
	 * All legacy drivers use this callback to de-initialize the hardware.
	 * This is purely because of the shadow-attach model, where the DRM
	 * kernel driver does not really own the hardware. Instead ownershipe is
	 * handled with the help of userspace through an inheritedly racy dance
	 * to set/unset the VT into raw mode.
	 *
	 * Legacy drivers initialize the hardware in the @firstopen callback,
	 * which isn't even called for modern drivers.
	 */
	void (*lastclose) (struct drm_device *);

	/**
	 * @unload:
	 *
	 * Reverse the effects of the driver load callback.  Ideally,
	 * the clean up performed by the driver should happen in the
	 * reverse order of the initialization.  Similarly to the load
	 * hook, this handler is deprecated and its usage should be
	 * dropped in favor of an open-coded teardown function at the
	 * driver layer.  See drm_dev_unregister() and drm_dev_put()
	 * for the proper way to remove a &struct drm_device.
	 *
	 * The unload() hook is called right after unregistering
	 * the device.
	 *
	 */
	void (*unload) (struct drm_device *);

	/**
	 * @release:
	 *
	 * Optional callback for destroying device data after the final
	 * reference is released, i.e. the device is being destroyed.
	 *
	 * This is deprecated, clean up all memory allocations associated with a
	 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
	 * managed resources functions.
	 */
	void (*release) (struct drm_device *);

	/**
	 * @irq_handler:
	 *
	 * Interrupt handler called when using drm_irq_install(). Not used by
	 * drivers which implement their own interrupt handling.
	 */
	irqreturn_t(*irq_handler) (int irq, void *arg);

	/**
	 * @irq_preinstall:
	 *
	 * Optional callback used by drm_irq_install() which is called before
	 * the interrupt handler is registered. This should be used to clear out
	 * any pending interrupts (from e.g. firmware based drives) and reset
	 * the interrupt handling registers.
	 */
	void (*irq_preinstall) (struct drm_device *dev);

	/**
	 * @irq_postinstall:
	 *
	 * Optional callback used by drm_irq_install() which is called after
	 * the interrupt handler is registered. This should be used to enable
	 * interrupt generation in the hardware.
	 */
	int (*irq_postinstall) (struct drm_device *dev);

	/**
	 * @irq_uninstall:
	 *
	 * Optional callback used by drm_irq_uninstall() which is called before
	 * the interrupt handler is unregistered. This should be used to disable
	 * interrupt generation in the hardware.
	 */
	void (*irq_uninstall) (struct drm_device *dev);

	/**
	 * @master_set:
	 *
	 * Called whenever the minor master is set. Only used by vmwgfx.
	 */
	void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
			   bool from_open);
	/**
	 * @master_drop:
	 *
	 * Called whenever the minor master is dropped. Only used by vmwgfx.
	 */
	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);

	/**
	 * @debugfs_init:
	 *
	 * Allows drivers to create driver-specific debugfs files.
	 */
	void (*debugfs_init)(struct drm_minor *minor);

	/**
	 * @gem_create_object: constructor for gem objects
	 *
	 * Hook for allocating the GEM object struct, for use by the CMA and
	 * SHMEM GEM helpers.
	 */
	struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
						    size_t size);

	/**
	 * @prime_handle_to_fd:
	 *
	 * Main PRIME export function. Should be implemented with
	 * drm_gem_prime_handle_to_fd() for GEM based drivers.
	 *
	 * For an in-depth discussion see :ref:`PRIME buffer sharing
	 * documentation <prime_buffer_sharing>`.
	 */
	int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
				uint32_t handle, uint32_t flags, int *prime_fd);
	/**
	 * @prime_fd_to_handle:
	 *
	 * Main PRIME import function. Should be implemented with
	 * drm_gem_prime_fd_to_handle() for GEM based drivers.
	 *
	 * For an in-depth discussion see :ref:`PRIME buffer sharing
	 * documentation <prime_buffer_sharing>`.
	 */
	int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
				int prime_fd, uint32_t *handle);

	/**
	 * @gem_prime_import:
	 *
	 * Import hook for GEM drivers.
	 *
	 * This defaults to drm_gem_prime_import() if not set.
	 */
	struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
				struct dma_buf *dma_buf);
	/**
	 * @gem_prime_import_sg_table:
	 *
	 * Optional hook used by the PRIME helper functions
	 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
	 */
	struct drm_gem_object *(*gem_prime_import_sg_table)(
				struct drm_device *dev,
				struct dma_buf_attachment *attach,
				struct sg_table *sgt);
	/**
	 * @gem_prime_mmap:
	 *
	 * mmap hook for GEM drivers, used to implement dma-buf mmap in the
	 * PRIME helpers.
	 *
	 * FIXME: There's way too much duplication going on here, and also moved
	 * to &drm_gem_object_funcs.
	 */
	int (*gem_prime_mmap)(struct drm_gem_object *obj,
				struct vm_area_struct *vma);

	/**
	 * @dumb_create:
	 *
	 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
	 * TTM or something else entirely) and returns the resulting buffer handle. This
	 * handle can then be wrapped up into a framebuffer modeset object.
	 *
	 * Note that userspace is not allowed to use such objects for render
	 * acceleration - drivers must create their own private ioctls for such a use
	 * case.
	 *
	 * Width, height and depth are specified in the &drm_mode_create_dumb
	 * argument. The callback needs to fill the handle, pitch and size for
	 * the created buffer.
	 *
	 * Called by the user via ioctl.
	 *
	 * Returns:
	 *
	 * Zero on success, negative errno on failure.
	 */
	int (*dumb_create)(struct drm_file *file_priv,
			   struct drm_device *dev,
			   struct drm_mode_create_dumb *args);
	/**
	 * @dumb_map_offset:
	 *
	 * Allocate an offset in the drm device node's address space to be able to
	 * memory map a dumb buffer.
	 *
	 * The default implementation is drm_gem_create_mmap_offset(). GEM based
	 * drivers must not overwrite this.
	 *
	 * Called by the user via ioctl.
	 *
	 * Returns:
	 *
	 * Zero on success, negative errno on failure.
	 */
	int (*dumb_map_offset)(struct drm_file *file_priv,
			       struct drm_device *dev, uint32_t handle,
			       uint64_t *offset);
	/**
	 * @dumb_destroy:
	 *
	 * This destroys the userspace handle for the given dumb backing storage buffer.
	 * Since buffer objects must be reference counted in the kernel a buffer object
	 * won't be immediately freed if a framebuffer modeset object still uses it.
	 *
	 * Called by the user via ioctl.
	 *
	 * The default implementation is drm_gem_dumb_destroy(). GEM based drivers
	 * must not overwrite this.
	 *
	 * Returns:
	 *
	 * Zero on success, negative errno on failure.
	 */
	int (*dumb_destroy)(struct drm_file *file_priv,
			    struct drm_device *dev,
			    uint32_t handle);

	/** @major: driver major number */
	int major;
	/** @minor: driver minor number */
	int minor;
	/** @patchlevel: driver patch level */
	int patchlevel;
	/** @name: driver name */
	char *name;
	/** @desc: driver description */
	char *desc;
	/** @date: driver date */
	char *date;

	/**
	 * @driver_features:
	 * Driver features, see &enum drm_driver_feature. Drivers can disable
	 * some features on a per-instance basis using
	 * &drm_device.driver_features.
	 */
	u32 driver_features;

	/**
	 * @ioctls:
	 *
	 * Array of driver-private IOCTL description entries. See the chapter on
	 * :ref:`IOCTL support in the userland interfaces
	 * chapter<drm_driver_ioctl>` for the full details.
	 */

	const struct drm_ioctl_desc *ioctls;
	/** @num_ioctls: Number of entries in @ioctls. */
	int num_ioctls;

	/**
	 * @fops:
	 *
	 * File operations for the DRM device node. See the discussion in
	 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
	 * some examples.
	 */
	const struct file_operations *fops;

#ifdef CONFIG_DRM_LEGACY
	/* Everything below here is for legacy driver, never use! */
	/* private: */

	int (*firstopen) (struct drm_device *);
	void (*preclose) (struct drm_device *, struct drm_file *file_priv);
	int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
	int (*dma_quiescent) (struct drm_device *);
	int (*context_dtor) (struct drm_device *dev, int context);
	u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
	int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
	void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
	int dev_priv_size;
#endif
};

void *__devm_drm_dev_alloc(struct device *parent,
			   const struct drm_driver *driver,
			   size_t size, size_t offset);

/**
 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
 * @parent: Parent device object
 * @driver: DRM driver
 * @type: the type of the struct which contains struct &drm_device
 * @member: the name of the &drm_device within @type.
 *
 * This allocates and initialize a new DRM device. No device registration is done.
 * Call drm_dev_register() to advertice the device to user space and register it
 * with other core subsystems. This should be done last in the device
 * initialization sequence to make sure userspace can't access an inconsistent
 * state.
 *
 * The initial ref-count of the object is 1. Use drm_dev_get() and
 * drm_dev_put() to take and drop further ref-counts.
 *
 * It is recommended that drivers embed &struct drm_device into their own device
 * structure.
 *
 * Note that this manages the lifetime of the resulting &drm_device
 * automatically using devres. The DRM device initialized with this function is
 * automatically put on driver detach using drm_dev_put().
 *
 * RETURNS:
 * Pointer to new DRM device, or ERR_PTR on failure.
 */
#define devm_drm_dev_alloc(parent, driver, type, member) \
	((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
				       offsetof(type, member)))

struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
				 struct device *parent);
int drm_dev_register(struct drm_device *dev, unsigned long flags);
void drm_dev_unregister(struct drm_device *dev);

void drm_dev_get(struct drm_device *dev);
void drm_dev_put(struct drm_device *dev);
void drm_put_dev(struct drm_device *dev);
bool drm_dev_enter(struct drm_device *dev, int *idx);
void drm_dev_exit(int idx);
void drm_dev_unplug(struct drm_device *dev);

/**
 * drm_dev_is_unplugged - is a DRM device unplugged
 * @dev: DRM device
 *
 * This function can be called to check whether a hotpluggable is unplugged.
 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
 * unplugged, these two functions guarantee that any store before calling
 * drm_dev_unplug() is visible to callers of this function after it completes
 *
 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
 * recommended that drivers instead use the underlying drm_dev_enter() and
 * drm_dev_exit() function pairs.
 */
static inline bool drm_dev_is_unplugged(struct drm_device *dev)
{
	int idx;

	if (drm_dev_enter(dev, &idx)) {
		drm_dev_exit(idx);
		return false;
	}

	return true;
}

/**
 * drm_core_check_all_features - check driver feature flags mask
 * @dev: DRM device to check
 * @features: feature flag(s) mask
 *
 * This checks @dev for driver features, see &drm_driver.driver_features,
 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
 *
 * Returns true if all features in the @features mask are supported, false
 * otherwise.
 */
static inline bool drm_core_check_all_features(const struct drm_device *dev,
					       u32 features)
{
	u32 supported = dev->driver->driver_features & dev->driver_features;

	return features && (supported & features) == features;
}

/**
 * drm_core_check_feature - check driver feature flags
 * @dev: DRM device to check
 * @feature: feature flag
 *
 * This checks @dev for driver features, see &drm_driver.driver_features,
 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
 *
 * Returns true if the @feature is supported, false otherwise.
 */
static inline bool drm_core_check_feature(const struct drm_device *dev,
					  enum drm_driver_feature feature)
{
	return drm_core_check_all_features(dev, feature);
}

/**
 * drm_drv_uses_atomic_modeset - check if the driver implements
 * atomic_commit()
 * @dev: DRM device
 *
 * This check is useful if drivers do not have DRIVER_ATOMIC set but
 * have atomic modesetting internally implemented.
 */
static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
{
	return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
		(dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
}


int drm_dev_set_unique(struct drm_device *dev, const char *name);


#endif