[deliverable/linux.git] / include / drm / ttm / ttm_object.h

/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */
/** @file ttm_object.h
 *
 * Base- and reference object implementation for the various
 * ttm objects. Implements reference counting, minimal security checks
 * and release on file close.
 */

#ifndef _TTM_OBJECT_H_
#define _TTM_OBJECT_H_

#include <linux/list.h>
#include <drm/drm_hashtab.h>
#include <linux/kref.h>
#include <linux/rcupdate.h>
#include <linux/dma-buf.h>
#include <ttm/ttm_memory.h>

/**
 * enum ttm_ref_type
 *
 * Describes what type of reference a ref object holds.
 *
 * TTM_REF_USAGE is a simple refcount on a base object.
 *
 * TTM_REF_SYNCCPU_READ is a SYNCCPU_READ reference on a
 * buffer object.
 *
 * TTM_REF_SYNCCPU_WRITE is a SYNCCPU_WRITE reference on a
 * buffer object.
 *
 */

enum ttm_ref_type {
	TTM_REF_USAGE,
	TTM_REF_SYNCCPU_READ,
	TTM_REF_SYNCCPU_WRITE,
	TTM_REF_NUM
};

/**
 * enum ttm_object_type
 *
 * One entry per ttm object type.
 * Device-specific types should use the
 * ttm_driver_typex types.
 */

enum ttm_object_type {
	ttm_fence_type,
	ttm_buffer_type,
	ttm_lock_type,
	ttm_prime_type,
	ttm_driver_type0 = 256,
	ttm_driver_type1,
	ttm_driver_type2,
	ttm_driver_type3,
	ttm_driver_type4,
	ttm_driver_type5
};

struct ttm_object_file;
struct ttm_object_device;

/**
 * struct ttm_base_object
 *
 * @hash: hash entry for the per-device object hash.
 * @type: derived type this object is base class for.
 * @shareable: Other ttm_object_files can access this object.
 *
 * @tfile: Pointer to ttm_object_file of the creator.
 * NULL if the object was not created by a user request.
 * (kernel object).
 *
 * @refcount: Number of references to this object, not
 * including the hash entry. A reference to a base object can
 * only be held by a ref object.
 *
 * @refcount_release: A function to be called when there are
 * no more references to this object. This function should
 * destroy the object (or make sure destruction eventually happens),
 * and when it is called, the object has
 * already been taken out of the per-device hash. The parameter
 * "base" should be set to NULL by the function.
 *
 * @ref_obj_release: A function to be called when a reference object
 * with another ttm_ref_type than TTM_REF_USAGE is deleted.
 * This function may, for example, release a lock held by a user-space
 * process.
 *
 * This struct is intended to be used as a base struct for objects that
 * are visible to user-space. It provides a global name, race-safe
 * access and refcounting, minimal access contol and hooks for unref actions.
 */

struct ttm_base_object {
	struct rcu_head rhead;
	struct drm_hash_item hash;
	enum ttm_object_type object_type;
	bool shareable;
	struct ttm_object_file *tfile;
	struct kref refcount;
	void (*refcount_release) (struct ttm_base_object **base);
	void (*ref_obj_release) (struct ttm_base_object *base,
				 enum ttm_ref_type ref_type);
};


/**
 * struct ttm_prime_object - Modified base object that is prime-aware
 *
 * @base: struct ttm_base_object that we derive from
 * @mutex: Mutex protecting the @dma_buf member.
 * @size: Size of the dma_buf associated with this object
 * @real_type: Type of the underlying object. Needed since we're setting
 * the value of @base::object_type to ttm_prime_type
 * @dma_buf: Non ref-coutned pointer to a struct dma_buf created from this
 * object.
 * @refcount_release: The underlying object's release method. Needed since
 * we set @base::refcount_release to our own release method.
 */

struct ttm_prime_object {
	struct ttm_base_object base;
	struct mutex mutex;
	size_t size;
	enum ttm_object_type real_type;
	struct dma_buf *dma_buf;
	void (*refcount_release) (struct ttm_base_object **);
};

/**
 * ttm_base_object_init
 *
 * @tfile: Pointer to a struct ttm_object_file.
 * @base: The struct ttm_base_object to initialize.
 * @shareable: This object is shareable with other applcations.
 * (different @tfile pointers.)
 * @type: The object type.
 * @refcount_release: See the struct ttm_base_object description.
 * @ref_obj_release: See the struct ttm_base_object description.
 *
 * Initializes a struct ttm_base_object.
 */

extern int ttm_base_object_init(struct ttm_object_file *tfile,
				struct ttm_base_object *base,
				bool shareable,
				enum ttm_object_type type,
				void (*refcount_release) (struct ttm_base_object
							  **),
				void (*ref_obj_release) (struct ttm_base_object
							 *,
							 enum ttm_ref_type
							 ref_type));

/**
 * ttm_base_object_lookup
 *
 * @tfile: Pointer to a struct ttm_object_file.
 * @key: Hash key
 *
 * Looks up a struct ttm_base_object with the key @key.
 */

extern struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file
						      *tfile, uint32_t key);

/**
 * ttm_base_object_lookup_for_ref
 *
 * @tdev: Pointer to a struct ttm_object_device.
 * @key: Hash key
 *
 * Looks up a struct ttm_base_object with the key @key.
 * This function should only be used when the struct tfile associated with the
 * caller doesn't yet have a reference to the base object.
 */

extern struct ttm_base_object *
ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key);

/**
 * ttm_base_object_unref
 *
 * @p_base: Pointer to a pointer referencing a struct ttm_base_object.
 *
 * Decrements the base object refcount and clears the pointer pointed to by
 * p_base.
 */

extern void ttm_base_object_unref(struct ttm_base_object **p_base);

/**
 * ttm_ref_object_add.
 *
 * @tfile: A struct ttm_object_file representing the application owning the
 * ref_object.
 * @base: The base object to reference.
 * @ref_type: The type of reference.
 * @existed: Upon completion, indicates that an identical reference object
 * already existed, and the refcount was upped on that object instead.
 *
 * Checks that the base object is shareable and adds a ref object to it.
 *
 * Adding a ref object to a base object is basically like referencing the
 * base object, but a user-space application holds the reference. When the
 * file corresponding to @tfile is closed, all its reference objects are
 * deleted. A reference object can have different types depending on what
 * it's intended for. It can be refcounting to prevent object destruction,
 * When user-space takes a lock, it can add a ref object to that lock to
 * make sure the lock is released if the application dies. A ref object
 * will hold a single reference on a base object.
 */
extern int ttm_ref_object_add(struct ttm_object_file *tfile,
			      struct ttm_base_object *base,
			      enum ttm_ref_type ref_type, bool *existed);

extern bool ttm_ref_object_exists(struct ttm_object_file *tfile,
				  struct ttm_base_object *base);

/**
 * ttm_ref_object_base_unref
 *
 * @key: Key representing the base object.
 * @ref_type: Ref type of the ref object to be dereferenced.
 *
 * Unreference a ref object with type @ref_type
 * on the base object identified by @key. If there are no duplicate
 * references, the ref object will be destroyed and the base object
 * will be unreferenced.
 */
extern int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
				     unsigned long key,
				     enum ttm_ref_type ref_type);

/**
 * ttm_object_file_init - initialize a struct ttm_object file
 *
 * @tdev: A struct ttm_object device this file is initialized on.
 * @hash_order: Order of the hash table used to hold the reference objects.
 *
 * This is typically called by the file_ops::open function.
 */

extern struct ttm_object_file *ttm_object_file_init(struct ttm_object_device
						    *tdev,
						    unsigned int hash_order);

/**
 * ttm_object_file_release - release data held by a ttm_object_file
 *
 * @p_tfile: Pointer to pointer to the ttm_object_file object to release.
 * *p_tfile will be set to NULL by this function.
 *
 * Releases all data associated by a ttm_object_file.
 * Typically called from file_ops::release. The caller must
 * ensure that there are no concurrent users of tfile.
 */

extern void ttm_object_file_release(struct ttm_object_file **p_tfile);

/**
 * ttm_object device init - initialize a struct ttm_object_device
 *
 * @mem_glob: struct ttm_mem_global for memory accounting.
 * @hash_order: Order of hash table used to hash the base objects.
 * @ops: DMA buf ops for prime objects of this device.
 *
 * This function is typically called on device initialization to prepare
 * data structures needed for ttm base and ref objects.
 */

extern struct ttm_object_device *
ttm_object_device_init(struct ttm_mem_global *mem_glob,
		       unsigned int hash_order,
		       const struct dma_buf_ops *ops);

/**
 * ttm_object_device_release - release data held by a ttm_object_device
 *
 * @p_tdev: Pointer to pointer to the ttm_object_device object to release.
 * *p_tdev will be set to NULL by this function.
 *
 * Releases all data associated by a ttm_object_device.
 * Typically called from driver::unload before the destruction of the
 * device private data structure.
 */

extern void ttm_object_device_release(struct ttm_object_device **p_tdev);

#define ttm_base_object_kfree(__object, __base)\
	kfree_rcu(__object, __base.rhead)

extern int ttm_prime_object_init(struct ttm_object_file *tfile,
				 size_t size,
				 struct ttm_prime_object *prime,
				 bool shareable,
				 enum ttm_object_type type,
				 void (*refcount_release)
				 (struct ttm_base_object **),
				 void (*ref_obj_release)
				 (struct ttm_base_object *,
				  enum ttm_ref_type ref_type));

static inline enum ttm_object_type
ttm_base_object_type(struct ttm_base_object *base)
{
	return (base->object_type == ttm_prime_type) ?
		container_of(base, struct ttm_prime_object, base)->real_type :
		base->object_type;
}
extern int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
				  int fd, u32 *handle);
extern int ttm_prime_handle_to_fd(struct ttm_object_file *tfile,
				  uint32_t handle, uint32_t flags,
				  int *prime_fd);

#define ttm_prime_object_kfree(__obj, __prime)		\
	kfree_rcu(__obj, __prime.base.rhead)
#endif
Commit	Line	Data
88071539 TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	29	*/
	30	/** @file ttm_object.h
	31	*
	32	* Base- and reference object implementation for the various
	33	* ttm objects. Implements reference counting, minimal security checks
	34	* and release on file close.
	35	*/
	36
	37	#ifndef _TTM_OBJECT_H_
	38	#define _TTM_OBJECT_H_
	39
	40	#include <linux/list.h>
a1ce3928	41	#include <drm/drm_hashtab.h>
88071539	42	#include <linux/kref.h>
cdad0521	43	#include <linux/rcupdate.h>
65981f76	44	#include <linux/dma-buf.h>
88071539 TH	45	#include <ttm/ttm_memory.h>
	46
	47	/**
	48	* enum ttm_ref_type
	49	*
	50	* Describes what type of reference a ref object holds.
	51	*
	52	* TTM_REF_USAGE is a simple refcount on a base object.
	53	*
	54	* TTM_REF_SYNCCPU_READ is a SYNCCPU_READ reference on a
	55	* buffer object.
	56	*
	57	* TTM_REF_SYNCCPU_WRITE is a SYNCCPU_WRITE reference on a
	58	* buffer object.
	59	*
	60	*/
	61
	62	enum ttm_ref_type {
	63	TTM_REF_USAGE,
	64	TTM_REF_SYNCCPU_READ,
	65	TTM_REF_SYNCCPU_WRITE,
	66	TTM_REF_NUM
	67	};
	68
	69	/**
	70	* enum ttm_object_type
	71	*
	72	* One entry per ttm object type.
	73	* Device-specific types should use the
	74	* ttm_driver_typex types.
	75	*/
	76
	77	enum ttm_object_type {
	78	ttm_fence_type,
	79	ttm_buffer_type,
	80	ttm_lock_type,
65981f76	81	ttm_prime_type,
88071539	82	ttm_driver_type0 = 256,
be1cb868 JB	83	ttm_driver_type1,
	84	ttm_driver_type2,
	85	ttm_driver_type3,
	86	ttm_driver_type4,
	87	ttm_driver_type5
88071539 TH	88	};
	89
	90	struct ttm_object_file;
	91	struct ttm_object_device;
	92
	93	/**
	94	* struct ttm_base_object
	95	*
	96	* @hash: hash entry for the per-device object hash.
	97	* @type: derived type this object is base class for.
	98	* @shareable: Other ttm_object_files can access this object.
	99	*
	100	* @tfile: Pointer to ttm_object_file of the creator.
	101	* NULL if the object was not created by a user request.
	102	* (kernel object).
	103	*
	104	* @refcount: Number of references to this object, not
	105	* including the hash entry. A reference to a base object can
	106	* only be held by a ref object.
	107	*
	108	* @refcount_release: A function to be called when there are
	109	* no more references to this object. This function should
	110	* destroy the object (or make sure destruction eventually happens),
	111	* and when it is called, the object has
	112	* already been taken out of the per-device hash. The parameter
	113	* "base" should be set to NULL by the function.
	114	*
	115	* @ref_obj_release: A function to be called when a reference object
	116	* with another ttm_ref_type than TTM_REF_USAGE is deleted.
0d74f86f	117	* This function may, for example, release a lock held by a user-space
88071539 TH	118	* process.
	119	*
	120	* This struct is intended to be used as a base struct for objects that
	121	* are visible to user-space. It provides a global name, race-safe
	122	* access and refcounting, minimal access contol and hooks for unref actions.
	123	*/
	124
	125	struct ttm_base_object {
cdad0521	126	struct rcu_head rhead;
88071539 TH	127	struct drm_hash_item hash;
	128	enum ttm_object_type object_type;
	129	bool shareable;
	130	struct ttm_object_file *tfile;
	131	struct kref refcount;
	132	void (refcount_release) (struct ttm_base_object *base);
	133	void (ref_obj_release) (struct ttm_base_object base,
	134	enum ttm_ref_type ref_type);
	135	};
	136
65981f76 TH	137
	138	/**
	139	* struct ttm_prime_object - Modified base object that is prime-aware
	140	*
	141	* @base: struct ttm_base_object that we derive from
	142	* @mutex: Mutex protecting the @dma_buf member.
	143	* @size: Size of the dma_buf associated with this object
	144	* @real_type: Type of the underlying object. Needed since we're setting
	145	* the value of @base::object_type to ttm_prime_type
	146	* @dma_buf: Non ref-coutned pointer to a struct dma_buf created from this
	147	* object.
	148	* @refcount_release: The underlying object's release method. Needed since
	149	* we set @base::refcount_release to our own release method.
	150	*/
	151
	152	struct ttm_prime_object {
	153	struct ttm_base_object base;
	154	struct mutex mutex;
	155	size_t size;
	156	enum ttm_object_type real_type;
	157	struct dma_buf *dma_buf;
	158	void (refcount_release) (struct ttm_base_object *);
	159	};
	160
88071539 TH	161	/**
	162	* ttm_base_object_init
	163	*
	164	* @tfile: Pointer to a struct ttm_object_file.
	165	* @base: The struct ttm_base_object to initialize.
	166	* @shareable: This object is shareable with other applcations.
	167	* (different @tfile pointers.)
	168	* @type: The object type.
	169	* @refcount_release: See the struct ttm_base_object description.
	170	* @ref_obj_release: See the struct ttm_base_object description.
	171	*
	172	* Initializes a struct ttm_base_object.
	173	*/
	174
	175	extern int ttm_base_object_init(struct ttm_object_file *tfile,
	176	struct ttm_base_object *base,
	177	bool shareable,
	178	enum ttm_object_type type,
	179	void (*refcount_release) (struct ttm_base_object
	180	**),
	181	void (*ref_obj_release) (struct ttm_base_object
	182	*,
	183	enum ttm_ref_type
	184	ref_type));
	185
	186	/**
	187	* ttm_base_object_lookup
	188	*
	189	* @tfile: Pointer to a struct ttm_object_file.
	190	* @key: Hash key
	191	*
	192	* Looks up a struct ttm_base_object with the key @key.
88071539 TH	193	*/
	194
	195	extern struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file
	196	*tfile, uint32_t key);
	197
05efb1ab TH	198	/**
	199	* ttm_base_object_lookup_for_ref
	200	*
	201	* @tdev: Pointer to a struct ttm_object_device.
	202	* @key: Hash key
	203	*
	204	* Looks up a struct ttm_base_object with the key @key.
	205	* This function should only be used when the struct tfile associated with the
	206	* caller doesn't yet have a reference to the base object.
	207	*/
	208
	209	extern struct ttm_base_object *
	210	ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key);
	211
88071539 TH	212	/**
	213	* ttm_base_object_unref
	214	*
0d74f86f	215	* @p_base: Pointer to a pointer referencing a struct ttm_base_object.
88071539 TH	216	*
	217	* Decrements the base object refcount and clears the pointer pointed to by
	218	* p_base.
	219	*/
	220
	221	extern void ttm_base_object_unref(struct ttm_base_object **p_base);
	222
	223	/**
	224	* ttm_ref_object_add.
	225	*
	226	* @tfile: A struct ttm_object_file representing the application owning the
	227	* ref_object.
	228	* @base: The base object to reference.
	229	* @ref_type: The type of reference.
	230	* @existed: Upon completion, indicates that an identical reference object
	231	* already existed, and the refcount was upped on that object instead.
	232	*
05efb1ab TH	233	* Checks that the base object is shareable and adds a ref object to it.
05efb1ab TH	234	*
88071539 TH	235	* Adding a ref object to a base object is basically like referencing the
	236	* base object, but a user-space application holds the reference. When the
	237	* file corresponding to @tfile is closed, all its reference objects are
	238	* deleted. A reference object can have different types depending on what
	239	* it's intended for. It can be refcounting to prevent object destruction,
	240	* When user-space takes a lock, it can add a ref object to that lock to
	241	* make sure the lock is released if the application dies. A ref object
	242	* will hold a single reference on a base object.
	243	*/
	244	extern int ttm_ref_object_add(struct ttm_object_file *tfile,
	245	struct ttm_base_object *base,
	246	enum ttm_ref_type ref_type, bool *existed);
0d3215e3 TH	247
	248	extern bool ttm_ref_object_exists(struct ttm_object_file *tfile,
	249	struct ttm_base_object *base);
	250
88071539 TH	251	/**
	252	* ttm_ref_object_base_unref
	253	*
	254	* @key: Key representing the base object.
	255	* @ref_type: Ref type of the ref object to be dereferenced.
	256	*
	257	* Unreference a ref object with type @ref_type
	258	* on the base object identified by @key. If there are no duplicate
	259	* references, the ref object will be destroyed and the base object
	260	* will be unreferenced.
	261	*/
	262	extern int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
	263	unsigned long key,
	264	enum ttm_ref_type ref_type);
	265
	266	/**
	267	* ttm_object_file_init - initialize a struct ttm_object file
	268	*
	269	* @tdev: A struct ttm_object device this file is initialized on.
	270	* @hash_order: Order of the hash table used to hold the reference objects.
	271	*
	272	* This is typically called by the file_ops::open function.
	273	*/
	274
	275	extern struct ttm_object_file *ttm_object_file_init(struct ttm_object_device
	276	*tdev,
	277	unsigned int hash_order);
	278
	279	/**
	280	* ttm_object_file_release - release data held by a ttm_object_file
	281	*
	282	* @p_tfile: Pointer to pointer to the ttm_object_file object to release.
	283	* *p_tfile will be set to NULL by this function.
	284	*
	285	* Releases all data associated by a ttm_object_file.
	286	* Typically called from file_ops::release. The caller must
	287	* ensure that there are no concurrent users of tfile.
	288	*/
	289
	290	extern void ttm_object_file_release(struct ttm_object_file **p_tfile);
	291
	292	/**
	293	* ttm_object device init - initialize a struct ttm_object_device
	294	*
65981f76	295	* @mem_glob: struct ttm_mem_global for memory accounting.
88071539	296	* @hash_order: Order of hash table used to hash the base objects.
65981f76	297	* @ops: DMA buf ops for prime objects of this device.
88071539 TH	298	*
	299	* This function is typically called on device initialization to prepare
	300	* data structures needed for ttm base and ref objects.
	301	*/
	302
65981f76 TH	303	extern struct ttm_object_device *
	304	ttm_object_device_init(struct ttm_mem_global *mem_glob,
	305	unsigned int hash_order,
	306	const struct dma_buf_ops *ops);
88071539 TH	307
	308	/**
	309	* ttm_object_device_release - release data held by a ttm_object_device
	310	*
	311	* @p_tdev: Pointer to pointer to the ttm_object_device object to release.
	312	* *p_tdev will be set to NULL by this function.
	313	*
	314	* Releases all data associated by a ttm_object_device.
	315	* Typically called from driver::unload before the destruction of the
	316	* device private data structure.
	317	*/
	318
	319	extern void ttm_object_device_release(struct ttm_object_device **p_tdev);
	320
cdad0521 TH	321	#define ttm_base_object_kfree(__object, __base)\
cdad0521 TH	322	kfree_rcu(__object, __base.rhead)
65981f76 TH	323
	324	extern int ttm_prime_object_init(struct ttm_object_file *tfile,
	325	size_t size,
	326	struct ttm_prime_object *prime,
	327	bool shareable,
	328	enum ttm_object_type type,
	329	void (*refcount_release)
	330	(struct ttm_base_object **),
	331	void (*ref_obj_release)
	332	(struct ttm_base_object *,
	333	enum ttm_ref_type ref_type));
	334
	335	static inline enum ttm_object_type
	336	ttm_base_object_type(struct ttm_base_object *base)
	337	{
	338	return (base->object_type == ttm_prime_type) ?
	339	container_of(base, struct ttm_prime_object, base)->real_type :
	340	base->object_type;
	341	}
	342	extern int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
	343	int fd, u32 *handle);
	344	extern int ttm_prime_handle_to_fd(struct ttm_object_file *tfile,
	345	uint32_t handle, uint32_t flags,
	346	int *prime_fd);
	347
	348	#define ttm_prime_object_kfree(__obj, __prime) \
	349	kfree_rcu(__obj, __prime.base.rhead)
88071539	350	#endif