[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / i915_gem_object.h

/*
 * Copyright © 2016 Intel Corporation
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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 __I915_GEM_OBJECT_H__
#define __I915_GEM_OBJECT_H__

#include <linux/reservation.h>

#include <drm/drm_vma_manager.h>
#include <drm/drm_gem.h>
#include <drm/drmP.h>

#include <drm/i915_drm.h>

#include "i915_gem_request.h"
#include "i915_selftest.h"

struct drm_i915_gem_object;

/*
 * struct i915_lut_handle tracks the fast lookups from handle to vma used
 * for execbuf. Although we use a radixtree for that mapping, in order to
 * remove them as the object or context is closed, we need a secondary list
 * and a translation entry (i915_lut_handle).
 */
struct i915_lut_handle {
	struct list_head obj_link;
	struct list_head ctx_link;
	struct i915_gem_context *ctx;
	u32 handle;
};

struct drm_i915_gem_object_ops {
	unsigned int flags;
#define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0)
#define I915_GEM_OBJECT_IS_SHRINKABLE   BIT(1)

	/* Interface between the GEM object and its backing storage.
	 * get_pages() is called once prior to the use of the associated set
	 * of pages before to binding them into the GTT, and put_pages() is
	 * called after we no longer need them. As we expect there to be
	 * associated cost with migrating pages between the backing storage
	 * and making them available for the GPU (e.g. clflush), we may hold
	 * onto the pages after they are no longer referenced by the GPU
	 * in case they may be used again shortly (for example migrating the
	 * pages to a different memory domain within the GTT). put_pages()
	 * will therefore most likely be called when the object itself is
	 * being released or under memory pressure (where we attempt to
	 * reap pages for the shrinker).
	 */
	int (*get_pages)(struct drm_i915_gem_object *);
	void (*put_pages)(struct drm_i915_gem_object *, struct sg_table *);

	int (*pwrite)(struct drm_i915_gem_object *,
		      const struct drm_i915_gem_pwrite *);

	int (*dmabuf_export)(struct drm_i915_gem_object *);
	void (*release)(struct drm_i915_gem_object *);
};

struct drm_i915_gem_object {
	struct drm_gem_object base;

	const struct drm_i915_gem_object_ops *ops;

	/**
	 * @vma_list: List of VMAs backed by this object
	 *
	 * The VMA on this list are ordered by type, all GGTT vma are placed
	 * at the head and all ppGTT vma are placed at the tail. The different
	 * types of GGTT vma are unordered between themselves, use the
	 * @vma_tree (which has a defined order between all VMA) to find an
	 * exact match.
	 */
	struct list_head vma_list;
	/**
	 * @vma_tree: Ordered tree of VMAs backed by this object
	 *
	 * All VMA created for this object are placed in the @vma_tree for
	 * fast retrieval via a binary search in i915_vma_instance().
	 * They are also added to @vma_list for easy iteration.
	 */
	struct rb_root vma_tree;

	/**
	 * @lut_list: List of vma lookup entries in use for this object.
	 *
	 * If this object is closed, we need to remove all of its VMA from
	 * the fast lookup index in associated contexts; @lut_list provides
	 * this translation from object to context->handles_vma.
	 */
	struct list_head lut_list;

	/** Stolen memory for this object, instead of being backed by shmem. */
	struct drm_mm_node *stolen;
	union {
		struct rcu_head rcu;
		struct llist_node freed;
	};

	/**
	 * Whether the object is currently in the GGTT mmap.
	 */
	unsigned int userfault_count;
	struct list_head userfault_link;

	struct list_head batch_pool_link;
	I915_SELFTEST_DECLARE(struct list_head st_link);

	unsigned long flags;

	/**
	 * Have we taken a reference for the object for incomplete GPU
	 * activity?
	 */
#define I915_BO_ACTIVE_REF 0

	/*
	 * Is the object to be mapped as read-only to the GPU
	 * Only honoured if hardware has relevant pte bit
	 */
	unsigned long gt_ro:1;
	unsigned int cache_level:3;
	unsigned int cache_coherent:2;
#define I915_BO_CACHE_COHERENT_FOR_READ BIT(0)
#define I915_BO_CACHE_COHERENT_FOR_WRITE BIT(1)
	unsigned int cache_dirty:1;

	atomic_t frontbuffer_bits;
	unsigned int frontbuffer_ggtt_origin; /* write once */
	struct i915_gem_active frontbuffer_write;

	/** Current tiling stride for the object, if it's tiled. */
	unsigned int tiling_and_stride;
#define FENCE_MINIMUM_STRIDE 128 /* See i915_tiling_ok() */
#define TILING_MASK (FENCE_MINIMUM_STRIDE-1)
#define STRIDE_MASK (~TILING_MASK)

	/** Count of VMA actually bound by this object */
	unsigned int bind_count;
	unsigned int active_count;
	/** Count of how many global VMA are currently pinned for use by HW */
	unsigned int pin_global;

	struct {
		struct mutex lock; /* protects the pages and their use */
		atomic_t pages_pin_count;

		struct sg_table *pages;
		void *mapping;

		/* TODO: whack some of this into the error state */
		struct i915_page_sizes {
			/**
			 * The sg mask of the pages sg_table. i.e the mask of
			 * of the lengths for each sg entry.
			 */
			unsigned int phys;

			/**
			 * The gtt page sizes we are allowed to use given the
			 * sg mask and the supported page sizes. This will
			 * express the smallest unit we can use for the whole
			 * object, as well as the larger sizes we may be able
			 * to use opportunistically.
			 */
			unsigned int sg;

			/**
			 * The actual gtt page size usage. Since we can have
			 * multiple vma associated with this object we need to
			 * prevent any trampling of state, hence a copy of this
			 * struct also lives in each vma, therefore the gtt
			 * value here should only be read/write through the vma.
			 */
			unsigned int gtt;
		} page_sizes;

		I915_SELFTEST_DECLARE(unsigned int page_mask);

		struct i915_gem_object_page_iter {
			struct scatterlist *sg_pos;
			unsigned int sg_idx; /* in pages, but 32bit eek! */

			struct radix_tree_root radix;
			struct mutex lock; /* protects this cache */
		} get_page;

		/**
		 * Element within i915->mm.unbound_list or i915->mm.bound_list,
		 * locked by i915->mm.obj_lock.
		 */
		struct list_head link;

		/**
		 * Advice: are the backing pages purgeable?
		 */
		unsigned int madv:2;

		/**
		 * This is set if the object has been written to since the
		 * pages were last acquired.
		 */
		bool dirty:1;

		/**
		 * This is set if the object has been pinned due to unknown
		 * swizzling.
		 */
		bool quirked:1;
	} mm;

	/** Breadcrumb of last rendering to the buffer.
	 * There can only be one writer, but we allow for multiple readers.
	 * If there is a writer that necessarily implies that all other
	 * read requests are complete - but we may only be lazily clearing
	 * the read requests. A read request is naturally the most recent
	 * request on a ring, so we may have two different write and read
	 * requests on one ring where the write request is older than the
	 * read request. This allows for the CPU to read from an active
	 * buffer by only waiting for the write to complete.
	 */
	struct reservation_object *resv;

	/** References from framebuffers, locks out tiling changes. */
	unsigned int framebuffer_references;

	/** Record of address bit 17 of each page at last unbind. */
	unsigned long *bit_17;

	union {
		struct i915_gem_userptr {
			uintptr_t ptr;
			unsigned read_only :1;

			struct i915_mm_struct *mm;
			struct i915_mmu_object *mmu_object;
			struct work_struct *work;
		} userptr;

		unsigned long scratch;
	};

	/** for phys allocated objects */
	struct drm_dma_handle *phys_handle;

	struct reservation_object __builtin_resv;
};

static inline struct drm_i915_gem_object *
to_intel_bo(struct drm_gem_object *gem)
{
	/* Assert that to_intel_bo(NULL) == NULL */
	BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));

	return container_of(gem, struct drm_i915_gem_object, base);
}

/**
 * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
 * @filp: DRM file private date
 * @handle: userspace handle
 *
 * Returns:
 *
 * A pointer to the object named by the handle if such exists on @filp, NULL
 * otherwise. This object is only valid whilst under the RCU read lock, and
 * note carefully the object may be in the process of being destroyed.
 */
static inline struct drm_i915_gem_object *
i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
{
#ifdef CONFIG_LOCKDEP
	WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
#endif
	return idr_find(&file->object_idr, handle);
}

static inline struct drm_i915_gem_object *
i915_gem_object_lookup(struct drm_file *file, u32 handle)
{
	struct drm_i915_gem_object *obj;

	rcu_read_lock();
	obj = i915_gem_object_lookup_rcu(file, handle);
	if (obj && !kref_get_unless_zero(&obj->base.refcount))
		obj = NULL;
	rcu_read_unlock();

	return obj;
}

__deprecated
extern struct drm_gem_object *
drm_gem_object_lookup(struct drm_file *file, u32 handle);

__attribute__((nonnull))
static inline struct drm_i915_gem_object *
i915_gem_object_get(struct drm_i915_gem_object *obj)
{
	drm_gem_object_reference(&obj->base);
	return obj;
}

__deprecated
extern void drm_gem_object_reference(struct drm_gem_object *);

__attribute__((nonnull))
static inline void
i915_gem_object_put(struct drm_i915_gem_object *obj)
{
	__drm_gem_object_unreference(&obj->base);
}

__deprecated
extern void drm_gem_object_unreference(struct drm_gem_object *);

__deprecated
extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);

static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
{
	reservation_object_lock(obj->resv, NULL);
}

static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
{
	reservation_object_unlock(obj->resv);
}

static inline bool
i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
{
	return obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE;
}

static inline bool
i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
{
	return obj->ops->flags & I915_GEM_OBJECT_IS_SHRINKABLE;
}

static inline bool
i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
{
	return obj->active_count;
}

static inline bool
i915_gem_object_has_active_reference(const struct drm_i915_gem_object *obj)
{
	return test_bit(I915_BO_ACTIVE_REF, &obj->flags);
}

static inline void
i915_gem_object_set_active_reference(struct drm_i915_gem_object *obj)
{
	lockdep_assert_held(&obj->base.dev->struct_mutex);
	__set_bit(I915_BO_ACTIVE_REF, &obj->flags);
}

static inline void
i915_gem_object_clear_active_reference(struct drm_i915_gem_object *obj)
{
	lockdep_assert_held(&obj->base.dev->struct_mutex);
	__clear_bit(I915_BO_ACTIVE_REF, &obj->flags);
}

void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj);

static inline bool
i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
{
	return READ_ONCE(obj->framebuffer_references);
}

static inline unsigned int
i915_gem_object_get_tiling(struct drm_i915_gem_object *obj)
{
	return obj->tiling_and_stride & TILING_MASK;
}

static inline bool
i915_gem_object_is_tiled(struct drm_i915_gem_object *obj)
{
	return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
}

static inline unsigned int
i915_gem_object_get_stride(struct drm_i915_gem_object *obj)
{
	return obj->tiling_and_stride & STRIDE_MASK;
}

static inline unsigned int
i915_gem_tile_height(unsigned int tiling)
{
	GEM_BUG_ON(!tiling);
	return tiling == I915_TILING_Y ? 32 : 8;
}

static inline unsigned int
i915_gem_object_get_tile_height(struct drm_i915_gem_object *obj)
{
	return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
}

static inline unsigned int
i915_gem_object_get_tile_row_size(struct drm_i915_gem_object *obj)
{
	return (i915_gem_object_get_stride(obj) *
		i915_gem_object_get_tile_height(obj));
}

int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
			       unsigned int tiling, unsigned int stride);

static inline struct intel_engine_cs *
i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
{
	struct intel_engine_cs *engine = NULL;
	struct dma_fence *fence;

	rcu_read_lock();
	fence = reservation_object_get_excl_rcu(obj->resv);
	rcu_read_unlock();

	if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
		engine = to_request(fence)->engine;
	dma_fence_put(fence);

	return engine;
}

void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
					 unsigned int cache_level);
void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);

#endif
Commit	Line	Data
b42fe9ca JL	1	/*
	2	* Copyright © 2016 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	*/
	24
	25	#ifndef __I915_GEM_OBJECT_H__
	26	#define __I915_GEM_OBJECT_H__
	27
	28	#include <linux/reservation.h>
	29
	30	#include <drm/drm_vma_manager.h>
	31	#include <drm/drm_gem.h>
	32	#include <drm/drmP.h>
	33
	34	#include <drm/i915_drm.h>
	35
b8f55be6	36	#include "i915_gem_request.h"
8d28ba45 CW	37	#include "i915_selftest.h"
8d28ba45 CW	38
b8f55be6 CW	39	struct drm_i915_gem_object;
b8f55be6 CW	40
d1b48c1e CW	41	/*
	42	* struct i915_lut_handle tracks the fast lookups from handle to vma used
	43	* for execbuf. Although we use a radixtree for that mapping, in order to
	44	* remove them as the object or context is closed, we need a secondary list
	45	* and a translation entry (i915_lut_handle).
	46	*/
	47	struct i915_lut_handle {
	48	struct list_head obj_link;
	49	struct list_head ctx_link;
	50	struct i915_gem_context *ctx;
	51	u32 handle;
	52	};
	53
b42fe9ca JL	54	struct drm_i915_gem_object_ops {
b42fe9ca JL	55	unsigned int flags;
22284f40 CW	56	#define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0)
22284f40 CW	57	#define I915_GEM_OBJECT_IS_SHRINKABLE BIT(1)
b42fe9ca JL	58
	59	/* Interface between the GEM object and its backing storage.
	60	* get_pages() is called once prior to the use of the associated set
	61	* of pages before to binding them into the GTT, and put_pages() is
	62	* called after we no longer need them. As we expect there to be
	63	* associated cost with migrating pages between the backing storage
	64	* and making them available for the GPU (e.g. clflush), we may hold
	65	* onto the pages after they are no longer referenced by the GPU
	66	* in case they may be used again shortly (for example migrating the
	67	* pages to a different memory domain within the GTT). put_pages()
	68	* will therefore most likely be called when the object itself is
	69	* being released or under memory pressure (where we attempt to
	70	* reap pages for the shrinker).
	71	*/
b91b09ee	72	int (get_pages)(struct drm_i915_gem_object );
b42fe9ca JL	73	void (put_pages)(struct drm_i915_gem_object , struct sg_table *);
b42fe9ca JL	74
7c55e2c5 CW	75	int (pwrite)(struct drm_i915_gem_object ,
	76	const struct drm_i915_gem_pwrite *);
	77
b42fe9ca JL	78	int (dmabuf_export)(struct drm_i915_gem_object );
	79	void (release)(struct drm_i915_gem_object );
	80	};
	81
	82	struct drm_i915_gem_object {
	83	struct drm_gem_object base;
	84
	85	const struct drm_i915_gem_object_ops *ops;
	86
b5a82425 CW	87	/**
	88	* @vma_list: List of VMAs backed by this object
	89	*
	90	* The VMA on this list are ordered by type, all GGTT vma are placed
	91	* at the head and all ppGTT vma are placed at the tail. The different
	92	* types of GGTT vma are unordered between themselves, use the
	93	* @vma_tree (which has a defined order between all VMA) to find an
	94	* exact match.
	95	*/
b42fe9ca	96	struct list_head vma_list;
b5a82425 CW	97	/**
	98	* @vma_tree: Ordered tree of VMAs backed by this object
	99	*
	100	* All VMA created for this object are placed in the @vma_tree for
	101	* fast retrieval via a binary search in i915_vma_instance().
	102	* They are also added to @vma_list for easy iteration.
	103	*/
b42fe9ca	104	struct rb_root vma_tree;
d1b48c1e CW	105
	106	/**
	107	* @lut_list: List of vma lookup entries in use for this object.
	108	*
	109	* If this object is closed, we need to remove all of its VMA from
	110	* the fast lookup index in associated contexts; @lut_list provides
	111	* this translation from object to context->handles_vma.
	112	*/
	113	struct list_head lut_list;
b42fe9ca JL	114
	115	/** Stolen memory for this object, instead of being backed by shmem. */
	116	struct drm_mm_node *stolen;
b42fe9ca JL	117	union {
	118	struct rcu_head rcu;
	119	struct llist_node freed;
	120	};
	121
	122	/**
	123	* Whether the object is currently in the GGTT mmap.
	124	*/
a65adaf8	125	unsigned int userfault_count;
b42fe9ca JL	126	struct list_head userfault_link;
b42fe9ca JL	127
b42fe9ca	128	struct list_head batch_pool_link;
8d28ba45	129	I915_SELFTEST_DECLARE(struct list_head st_link);
b42fe9ca JL	130
	131	unsigned long flags;
	132
	133	/**
	134	* Have we taken a reference for the object for incomplete GPU
	135	* activity?
	136	*/
	137	#define I915_BO_ACTIVE_REF 0
	138
	139	/*
	140	* Is the object to be mapped as read-only to the GPU
	141	* Only honoured if hardware has relevant pte bit
	142	*/
	143	unsigned long gt_ro:1;
	144	unsigned int cache_level:3;
b8f55be6 CW	145	unsigned int cache_coherent:2;
	146	#define I915_BO_CACHE_COHERENT_FOR_READ BIT(0)
	147	#define I915_BO_CACHE_COHERENT_FOR_WRITE BIT(1)
b42fe9ca JL	148	unsigned int cache_dirty:1;
	149
	150	atomic_t frontbuffer_bits;
	151	unsigned int frontbuffer_ggtt_origin; /* write once */
5b8c8aec	152	struct i915_gem_active frontbuffer_write;
b42fe9ca JL	153
	154	/** Current tiling stride for the object, if it's tiled. */
	155	unsigned int tiling_and_stride;
	156	#define FENCE_MINIMUM_STRIDE 128 /* See i915_tiling_ok() */
	157	#define TILING_MASK (FENCE_MINIMUM_STRIDE-1)
	158	#define STRIDE_MASK (~TILING_MASK)
	159
	160	/** Count of VMA actually bound by this object */
	161	unsigned int bind_count;
	162	unsigned int active_count;
bd3d2252 CW	163	/** Count of how many global VMA are currently pinned for use by HW */
bd3d2252 CW	164	unsigned int pin_global;
b42fe9ca JL	165
	166	struct {
	167	struct mutex lock; /* protects the pages and their use */
	168	atomic_t pages_pin_count;
	169
	170	struct sg_table *pages;
	171	void *mapping;
	172
d9ec12f8	173	/* TODO: whack some of this into the error state */
a5c08166 MA	174	struct i915_page_sizes {
	175	/**
	176	* The sg mask of the pages sg_table. i.e the mask of
	177	* of the lengths for each sg entry.
	178	*/
	179	unsigned int phys;
	180
	181	/**
	182	* The gtt page sizes we are allowed to use given the
	183	* sg mask and the supported page sizes. This will
	184	* express the smallest unit we can use for the whole
	185	* object, as well as the larger sizes we may be able
	186	* to use opportunistically.
	187	*/
	188	unsigned int sg;
d9ec12f8 MA	189
	190	/**
	191	* The actual gtt page size usage. Since we can have
	192	* multiple vma associated with this object we need to
	193	* prevent any trampling of state, hence a copy of this
	194	* struct also lives in each vma, therefore the gtt
	195	* value here should only be read/write through the vma.
	196	*/
	197	unsigned int gtt;
a5c08166 MA	198	} page_sizes;
a5c08166 MA	199
4049866f MA	200	I915_SELFTEST_DECLARE(unsigned int page_mask);
4049866f MA	201
b42fe9ca JL	202	struct i915_gem_object_page_iter {
	203	struct scatterlist *sg_pos;
	204	unsigned int sg_idx; /* in pages, but 32bit eek! */
	205
	206	struct radix_tree_root radix;
	207	struct mutex lock; /* protects this cache */
	208	} get_page;
	209
f2123818 CW	210	/**
	211	* Element within i915->mm.unbound_list or i915->mm.bound_list,
	212	* locked by i915->mm.obj_lock.
	213	*/
	214	struct list_head link;
	215
b42fe9ca JL	216	/**
	217	* Advice: are the backing pages purgeable?
	218	*/
	219	unsigned int madv:2;
	220
	221	/**
	222	* This is set if the object has been written to since the
	223	* pages were last acquired.
	224	*/
	225	bool dirty:1;
	226
	227	/**
	228	* This is set if the object has been pinned due to unknown
	229	* swizzling.
	230	*/
	231	bool quirked:1;
	232	} mm;
	233
	234	/** Breadcrumb of last rendering to the buffer.
	235	* There can only be one writer, but we allow for multiple readers.
	236	* If there is a writer that necessarily implies that all other
	237	* read requests are complete - but we may only be lazily clearing
	238	* the read requests. A read request is naturally the most recent
	239	* request on a ring, so we may have two different write and read
	240	* requests on one ring where the write request is older than the
	241	* read request. This allows for the CPU to read from an active
	242	* buffer by only waiting for the write to complete.
	243	*/
	244	struct reservation_object *resv;
	245
	246	/** References from framebuffers, locks out tiling changes. */
dd689287	247	unsigned int framebuffer_references;
b42fe9ca JL	248
	249	/** Record of address bit 17 of each page at last unbind. */
	250	unsigned long *bit_17;
	251
44653988 CW	252	union {
	253	struct i915_gem_userptr {
	254	uintptr_t ptr;
	255	unsigned read_only :1;
	256
	257	struct i915_mm_struct *mm;
	258	struct i915_mmu_object *mmu_object;
	259	struct work_struct *work;
	260	} userptr;
	261
	262	unsigned long scratch;
	263	};
b42fe9ca JL	264
	265	/** for phys allocated objects */
	266	struct drm_dma_handle *phys_handle;
	267
	268	struct reservation_object __builtin_resv;
	269	};
	270
	271	static inline struct drm_i915_gem_object *
	272	to_intel_bo(struct drm_gem_object *gem)
	273	{
	274	/* Assert that to_intel_bo(NULL) == NULL */
	275	BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));
	276
	277	return container_of(gem, struct drm_i915_gem_object, base);
	278	}
	279
	280	/**
	281	* i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
	282	* @filp: DRM file private date
	283	* @handle: userspace handle
	284	*
	285	* Returns:
	286	*
	287	* A pointer to the object named by the handle if such exists on @filp, NULL
	288	* otherwise. This object is only valid whilst under the RCU read lock, and
	289	* note carefully the object may be in the process of being destroyed.
	290	*/
	291	static inline struct drm_i915_gem_object *
	292	i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
	293	{
	294	#ifdef CONFIG_LOCKDEP
	295	WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
	296	#endif
	297	return idr_find(&file->object_idr, handle);
	298	}
	299
	300	static inline struct drm_i915_gem_object *
	301	i915_gem_object_lookup(struct drm_file *file, u32 handle)
	302	{
	303	struct drm_i915_gem_object *obj;
	304
	305	rcu_read_lock();
	306	obj = i915_gem_object_lookup_rcu(file, handle);
	307	if (obj && !kref_get_unless_zero(&obj->base.refcount))
	308	obj = NULL;
	309	rcu_read_unlock();
	310
	311	return obj;
	312	}
	313
	314	__deprecated
	315	extern struct drm_gem_object *
	316	drm_gem_object_lookup(struct drm_file *file, u32 handle);
	317
	318	__attribute__((nonnull))
	319	static inline struct drm_i915_gem_object *
	320	i915_gem_object_get(struct drm_i915_gem_object *obj)
	321	{
	322	drm_gem_object_reference(&obj->base);
	323	return obj;
	324	}
	325
	326	__deprecated
	327	extern void drm_gem_object_reference(struct drm_gem_object *);
328
329	__attribute__((nonnull))
330	static inline void
331	i915_gem_object_put(struct drm_i915_gem_object *obj)
332	{
333	__drm_gem_object_unreference(&obj->base);
334	}
335
336	__deprecated
337	extern void drm_gem_object_unreference(struct drm_gem_object *);
338
339	__deprecated
340	extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);
341
dd689287 CW	342	static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
	343	{
	344	reservation_object_lock(obj->resv, NULL);
	345	}
	346
	347	static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
	348	{
	349	reservation_object_unlock(obj->resv);
	350	}
	351
b42fe9ca JL	352	static inline bool
	353	i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
	354	{
	355	return obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE;
	356	}
	357
	358	static inline bool
	359	i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
	360	{
	361	return obj->ops->flags & I915_GEM_OBJECT_IS_SHRINKABLE;
	362	}
	363
	364	static inline bool
	365	i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
	366	{
	367	return obj->active_count;
	368	}
	369
	370	static inline bool
	371	i915_gem_object_has_active_reference(const struct drm_i915_gem_object *obj)
	372	{
	373	return test_bit(I915_BO_ACTIVE_REF, &obj->flags);
	374	}
	375
	376	static inline void
	377	i915_gem_object_set_active_reference(struct drm_i915_gem_object *obj)
	378	{
	379	lockdep_assert_held(&obj->base.dev->struct_mutex);
	380	__set_bit(I915_BO_ACTIVE_REF, &obj->flags);
	381	}
	382
	383	static inline void
	384	i915_gem_object_clear_active_reference(struct drm_i915_gem_object *obj)
	385	{
	386	lockdep_assert_held(&obj->base.dev->struct_mutex);
	387	__clear_bit(I915_BO_ACTIVE_REF, &obj->flags);
	388	}
	389
	390	void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj);
	391
dd689287 CW	392	static inline bool
	393	i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
	394	{
	395	return READ_ONCE(obj->framebuffer_references);
	396	}
	397
b42fe9ca JL	398	static inline unsigned int
	399	i915_gem_object_get_tiling(struct drm_i915_gem_object *obj)
	400	{
	401	return obj->tiling_and_stride & TILING_MASK;
	402	}
	403
	404	static inline bool
	405	i915_gem_object_is_tiled(struct drm_i915_gem_object *obj)
	406	{
	407	return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
	408	}
	409
	410	static inline unsigned int
	411	i915_gem_object_get_stride(struct drm_i915_gem_object *obj)
	412	{
	413	return obj->tiling_and_stride & STRIDE_MASK;
	414	}
	415
6649a0b6 CW	416	static inline unsigned int
	417	i915_gem_tile_height(unsigned int tiling)
	418	{
	419	GEM_BUG_ON(!tiling);
	420	return tiling == I915_TILING_Y ? 32 : 8;
	421	}
	422
	423	static inline unsigned int
	424	i915_gem_object_get_tile_height(struct drm_i915_gem_object *obj)
	425	{
	426	return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
	427	}
	428
	429	static inline unsigned int
	430	i915_gem_object_get_tile_row_size(struct drm_i915_gem_object *obj)
	431	{
	432	return (i915_gem_object_get_stride(obj) *
	433	i915_gem_object_get_tile_height(obj));
	434	}
	435
957870f9 CW	436	int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
	437	unsigned int tiling, unsigned int stride);
	438
b42fe9ca JL	439	static inline struct intel_engine_cs *
	440	i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
	441	{
	442	struct intel_engine_cs *engine = NULL;
	443	struct dma_fence *fence;
	444
	445	rcu_read_lock();
	446	fence = reservation_object_get_excl_rcu(obj->resv);
	447	rcu_read_unlock();
	448
	449	if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
	450	engine = to_request(fence)->engine;
	451	dma_fence_put(fence);
	452
	453	return engine;
	454	}
	455
b8f55be6 CW	456	void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
b8f55be6 CW	457	unsigned int cache_level);
5a97bcc6 CW	458	void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
5a97bcc6 CW	459
b42fe9ca JL	460	#endif
b42fe9ca JL	461