[linux-2.6-block.git] / drivers / gpu / drm / i915 / i915_vma.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_VMA_H__
#define __I915_VMA_H__

#include <linux/io-mapping.h>

#include <drm/drm_mm.h>

#include "i915_gem_gtt.h"
#include "i915_gem_fence_reg.h"
#include "i915_gem_object.h"
#include "i915_gem_request.h"


enum i915_cache_level;

/**
 * A VMA represents a GEM BO that is bound into an address space. Therefore, a
 * VMA's presence cannot be guaranteed before binding, or after unbinding the
 * object into/from the address space.
 *
 * To make things as simple as possible (ie. no refcounting), a VMA's lifetime
 * will always be <= an objects lifetime. So object refcounting should cover us.
 */
struct i915_vma {
	struct drm_mm_node node;
	struct drm_i915_gem_object *obj;
	struct i915_address_space *vm;
	struct drm_i915_fence_reg *fence;
	struct reservation_object *resv; /** Alias of obj->resv */
	struct sg_table *pages;
	void __iomem *iomap;
	u64 size;
	u64 display_alignment;

	u32 fence_size;
	u32 fence_alignment;

	unsigned int flags;
	/**
	 * How many users have pinned this object in GTT space. The following
	 * users can each hold at most one reference: pwrite/pread, execbuffer
	 * (objects are not allowed multiple times for the same batchbuffer),
	 * and the framebuffer code. When switching/pageflipping, the
	 * framebuffer code has at most two buffers pinned per crtc.
	 *
	 * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
	 * bits with absolutely no headroom. So use 4 bits.
	 */
#define I915_VMA_PIN_MASK 0xf
#define I915_VMA_PIN_OVERFLOW	BIT(5)

	/** Flags and address space this VMA is bound to */
#define I915_VMA_GLOBAL_BIND	BIT(6)
#define I915_VMA_LOCAL_BIND	BIT(7)
#define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND | I915_VMA_PIN_OVERFLOW)

#define I915_VMA_GGTT		BIT(8)
#define I915_VMA_CAN_FENCE	BIT(9)
#define I915_VMA_CLOSED		BIT(10)

	unsigned int active;
	struct i915_gem_active last_read[I915_NUM_ENGINES];
	struct i915_gem_active last_fence;

	/**
	 * Support different GGTT views into the same object.
	 * This means there can be multiple VMA mappings per object and per VM.
	 * i915_ggtt_view_type is used to distinguish between those entries.
	 * The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
	 * assumed in GEM functions which take no ggtt view parameter.
	 */
	struct i915_ggtt_view ggtt_view;

	/** This object's place on the active/inactive lists */
	struct list_head vm_link;

	struct list_head obj_link; /* Link in the object's VMA list */
	struct rb_node obj_node;
	struct hlist_node obj_hash;

	/** This vma's place in the execbuf reservation list */
	struct list_head exec_link;
	struct list_head reloc_link;

	/** This vma's place in the eviction list */
	struct list_head evict_link;

	/**
	 * Used for performing relocations during execbuffer insertion.
	 */
	struct drm_i915_gem_exec_object2 *exec_entry;
	struct hlist_node exec_node;
	u32 exec_handle;

	struct i915_gem_context *ctx;
	struct hlist_node ctx_node;
	u32 ctx_handle;
};

struct i915_vma *
i915_vma_instance(struct drm_i915_gem_object *obj,
		  struct i915_address_space *vm,
		  const struct i915_ggtt_view *view);

void i915_vma_unpin_and_release(struct i915_vma **p_vma);

static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
{
	return vma->flags & I915_VMA_GGTT;
}

static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
{
	return vma->flags & I915_VMA_CAN_FENCE;
}

static inline bool i915_vma_is_closed(const struct i915_vma *vma)
{
	return vma->flags & I915_VMA_CLOSED;
}

static inline unsigned int i915_vma_get_active(const struct i915_vma *vma)
{
	return vma->active;
}

static inline bool i915_vma_is_active(const struct i915_vma *vma)
{
	return i915_vma_get_active(vma);
}

static inline void i915_vma_set_active(struct i915_vma *vma,
				       unsigned int engine)
{
	vma->active |= BIT(engine);
}

static inline void i915_vma_clear_active(struct i915_vma *vma,
					 unsigned int engine)
{
	vma->active &= ~BIT(engine);
}

static inline bool i915_vma_has_active_engine(const struct i915_vma *vma,
					      unsigned int engine)
{
	return vma->active & BIT(engine);
}

static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
{
	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
	GEM_BUG_ON(!vma->node.allocated);
	GEM_BUG_ON(upper_32_bits(vma->node.start));
	GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
	return lower_32_bits(vma->node.start);
}

static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
{
	i915_gem_object_get(vma->obj);
	return vma;
}

static inline void i915_vma_put(struct i915_vma *vma)
{
	i915_gem_object_put(vma->obj);
}

static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
{
	return a - b;
}

static inline long
i915_vma_compare(struct i915_vma *vma,
		 struct i915_address_space *vm,
		 const struct i915_ggtt_view *view)
{
	ptrdiff_t cmp;

	GEM_BUG_ON(view && !i915_is_ggtt(vm));

	cmp = ptrdiff(vma->vm, vm);
	if (cmp)
		return cmp;

	BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL != 0);
	cmp = vma->ggtt_view.type;
	if (!view)
		return cmp;

	cmp -= view->type;
	if (cmp)
		return cmp;

	/* ggtt_view.type also encodes its size so that we both distinguish
	 * different views using it as a "type" and also use a compact (no
	 * accessing of uninitialised padding bytes) memcmp without storing
	 * an extra parameter or adding more code.
	 *
	 * To ensure that the memcmp is valid for all branches of the union,
	 * even though the code looks like it is just comparing one branch,
	 * we assert above that all branches have the same address, and that
	 * each branch has a unique type/size.
	 */
	BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
	BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
	BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
		     offsetof(typeof(*view), partial));
	return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
}

int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
		  u32 flags);
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
bool i915_vma_misplaced(const struct i915_vma *vma,
			u64 size, u64 alignment, u64 flags);
void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
int __must_check i915_vma_unbind(struct i915_vma *vma);
void i915_vma_unlink_ctx(struct i915_vma *vma);
void i915_vma_close(struct i915_vma *vma);

int __i915_vma_do_pin(struct i915_vma *vma,
		      u64 size, u64 alignment, u64 flags);
static inline int __must_check
i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
{
	BUILD_BUG_ON(PIN_MBZ != I915_VMA_PIN_OVERFLOW);
	BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
	BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);

	/* Pin early to prevent the shrinker/eviction logic from destroying
	 * our vma as we insert and bind.
	 */
	if (likely(((++vma->flags ^ flags) & I915_VMA_BIND_MASK) == 0)) {
		GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
		GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
		return 0;
	}

	return __i915_vma_do_pin(vma, size, alignment, flags);
}

static inline int i915_vma_pin_count(const struct i915_vma *vma)
{
	return vma->flags & I915_VMA_PIN_MASK;
}

static inline bool i915_vma_is_pinned(const struct i915_vma *vma)
{
	return i915_vma_pin_count(vma);
}

static inline void __i915_vma_pin(struct i915_vma *vma)
{
	vma->flags++;
	GEM_BUG_ON(vma->flags & I915_VMA_PIN_OVERFLOW);
}

static inline void __i915_vma_unpin(struct i915_vma *vma)
{
	GEM_BUG_ON(!i915_vma_is_pinned(vma));
	vma->flags--;
}

static inline void i915_vma_unpin(struct i915_vma *vma)
{
	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
	__i915_vma_unpin(vma);
}

/**
 * i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
 * @vma: VMA to iomap
 *
 * The passed in VMA has to be pinned in the global GTT mappable region.
 * An extra pinning of the VMA is acquired for the return iomapping,
 * the caller must call i915_vma_unpin_iomap to relinquish the pinning
 * after the iomapping is no longer required.
 *
 * Callers must hold the struct_mutex.
 *
 * Returns a valid iomapped pointer or ERR_PTR.
 */
void __iomem *i915_vma_pin_iomap(struct i915_vma *vma);
#define IO_ERR_PTR(x) ((void __iomem *)ERR_PTR(x))

/**
 * i915_vma_unpin_iomap - unpins the mapping returned from i915_vma_iomap
 * @vma: VMA to unpin
 *
 * Unpins the previously iomapped VMA from i915_vma_pin_iomap().
 *
 * Callers must hold the struct_mutex. This function is only valid to be
 * called on a VMA previously iomapped by the caller with i915_vma_pin_iomap().
 */
static inline void i915_vma_unpin_iomap(struct i915_vma *vma)
{
	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
	GEM_BUG_ON(vma->iomap == NULL);
	i915_vma_unpin(vma);
}

static inline struct page *i915_vma_first_page(struct i915_vma *vma)
{
	GEM_BUG_ON(!vma->pages);
	return sg_page(vma->pages->sgl);
}

/**
 * i915_vma_pin_fence - pin fencing state
 * @vma: vma to pin fencing for
 *
 * This pins the fencing state (whether tiled or untiled) to make sure the
 * vma (and its object) is ready to be used as a scanout target. Fencing
 * status must be synchronize first by calling i915_vma_get_fence():
 *
 * The resulting fence pin reference must be released again with
 * i915_vma_unpin_fence().
 *
 * Returns:
 *
 * True if the vma has a fence, false otherwise.
 */
static inline bool
i915_vma_pin_fence(struct i915_vma *vma)
{
	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
	if (vma->fence) {
		vma->fence->pin_count++;
		return true;
	} else
		return false;
}

/**
 * i915_vma_unpin_fence - unpin fencing state
 * @vma: vma to unpin fencing for
 *
 * This releases the fence pin reference acquired through
 * i915_vma_pin_fence. It will handle both objects with and without an
 * attached fence correctly, callers do not need to distinguish this.
 */
static inline void
i915_vma_unpin_fence(struct i915_vma *vma)
{
	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
	if (vma->fence) {
		GEM_BUG_ON(vma->fence->pin_count <= 0);
		vma->fence->pin_count--;
	}
}

#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_VMA_H__
	26	#define __I915_VMA_H__
	27
	28	#include <linux/io-mapping.h>
	29
	30	#include <drm/drm_mm.h>
	31
	32	#include "i915_gem_gtt.h"
	33	#include "i915_gem_fence_reg.h"
	34	#include "i915_gem_object.h"
	35	#include "i915_gem_request.h"
	36
	37
	38	enum i915_cache_level;
	39
	40	/**
	41	* A VMA represents a GEM BO that is bound into an address space. Therefore, a
	42	* VMA's presence cannot be guaranteed before binding, or after unbinding the
	43	* object into/from the address space.
	44	*
	45	* To make things as simple as possible (ie. no refcounting), a VMA's lifetime
	46	* will always be <= an objects lifetime. So object refcounting should cover us.
	47	*/
	48	struct i915_vma {
	49	struct drm_mm_node node;
	50	struct drm_i915_gem_object *obj;
	51	struct i915_address_space *vm;
	52	struct drm_i915_fence_reg *fence;
95ff7c7d	53	struct reservation_object resv; /* Alias of obj->resv */
b42fe9ca JL	54	struct sg_table *pages;
	55	void __iomem *iomap;
	56	u64 size;
	57	u64 display_alignment;
	58
944397f0 CW	59	u32 fence_size;
	60	u32 fence_alignment;
	61
b42fe9ca JL	62	unsigned int flags;
	63	/**
	64	* How many users have pinned this object in GTT space. The following
	65	* users can each hold at most one reference: pwrite/pread, execbuffer
	66	* (objects are not allowed multiple times for the same batchbuffer),
	67	* and the framebuffer code. When switching/pageflipping, the
	68	* framebuffer code has at most two buffers pinned per crtc.
	69	*
	70	* In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
	71	* bits with absolutely no headroom. So use 4 bits.
	72	*/
	73	#define I915_VMA_PIN_MASK 0xf
	74	#define I915_VMA_PIN_OVERFLOW BIT(5)
	75
	76	/** Flags and address space this VMA is bound to */
	77	#define I915_VMA_GLOBAL_BIND BIT(6)
	78	#define I915_VMA_LOCAL_BIND BIT(7)
	79	#define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND \| I915_VMA_LOCAL_BIND \| I915_VMA_PIN_OVERFLOW)
	80
	81	#define I915_VMA_GGTT BIT(8)
	82	#define I915_VMA_CAN_FENCE BIT(9)
	83	#define I915_VMA_CLOSED BIT(10)
	84
	85	unsigned int active;
	86	struct i915_gem_active last_read[I915_NUM_ENGINES];
b42fe9ca JL	87	struct i915_gem_active last_fence;
	88
	89	/**
	90	* Support different GGTT views into the same object.
	91	* This means there can be multiple VMA mappings per object and per VM.
	92	* i915_ggtt_view_type is used to distinguish between those entries.
	93	* The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
	94	* assumed in GEM functions which take no ggtt view parameter.
	95	*/
	96	struct i915_ggtt_view ggtt_view;
	97
	98	/** This object's place on the active/inactive lists */
	99	struct list_head vm_link;
	100
	101	struct list_head obj_link; /* Link in the object's VMA list */
	102	struct rb_node obj_node;
4ff4b44c	103	struct hlist_node obj_hash;
b42fe9ca	104
8c45cec4 CW	105	/** This vma's place in the execbuf reservation list */
8c45cec4 CW	106	struct list_head exec_link;
2889caa9	107	struct list_head reloc_link;
8c45cec4 CW	108
	109	/** This vma's place in the eviction list */
	110	struct list_head evict_link;
b42fe9ca JL	111
	112	/**
	113	* Used for performing relocations during execbuffer insertion.
	114	*/
b42fe9ca	115	struct drm_i915_gem_exec_object2 *exec_entry;
95ff7c7d	116	struct hlist_node exec_node;
4ff4b44c CW	117	u32 exec_handle;
	118
	119	struct i915_gem_context *ctx;
	120	struct hlist_node ctx_node;
	121	u32 ctx_handle;
b42fe9ca JL	122	};
b42fe9ca JL	123
718659a6 CW	124	struct i915_vma *
	125	i915_vma_instance(struct drm_i915_gem_object *obj,
	126	struct i915_address_space *vm,
	127	const struct i915_ggtt_view *view);
	128
b42fe9ca JL	129	void i915_vma_unpin_and_release(struct i915_vma **p_vma);
	130
	131	static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
	132	{
	133	return vma->flags & I915_VMA_GGTT;
	134	}
	135
	136	static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
	137	{
	138	return vma->flags & I915_VMA_CAN_FENCE;
	139	}
	140
	141	static inline bool i915_vma_is_closed(const struct i915_vma *vma)
	142	{
	143	return vma->flags & I915_VMA_CLOSED;
	144	}
	145
	146	static inline unsigned int i915_vma_get_active(const struct i915_vma *vma)
	147	{
	148	return vma->active;
	149	}
	150
	151	static inline bool i915_vma_is_active(const struct i915_vma *vma)
	152	{
	153	return i915_vma_get_active(vma);
	154	}
	155
	156	static inline void i915_vma_set_active(struct i915_vma *vma,
	157	unsigned int engine)
	158	{
	159	vma->active \|= BIT(engine);
	160	}
	161
	162	static inline void i915_vma_clear_active(struct i915_vma *vma,
	163	unsigned int engine)
	164	{
	165	vma->active &= ~BIT(engine);
	166	}
	167
	168	static inline bool i915_vma_has_active_engine(const struct i915_vma *vma,
	169	unsigned int engine)
	170	{
	171	return vma->active & BIT(engine);
	172	}
	173
	174	static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
	175	{
	176	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
	177	GEM_BUG_ON(!vma->node.allocated);
	178	GEM_BUG_ON(upper_32_bits(vma->node.start));
	179	GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
	180	return lower_32_bits(vma->node.start);
	181	}
	182
	183	static inline struct i915_vma i915_vma_get(struct i915_vma vma)
	184	{
	185	i915_gem_object_get(vma->obj);
	186	return vma;
	187	}
	188
	189	static inline void i915_vma_put(struct i915_vma *vma)
	190	{
	191	i915_gem_object_put(vma->obj);
	192	}
193
2bf0d267 TU	194	static __always_inline ptrdiff_t ptrdiff(const void a, const void b)
	195	{
	196	return a - b;
	197	}
	198
b42fe9ca JL	199	static inline long
	200	i915_vma_compare(struct i915_vma *vma,
	201	struct i915_address_space *vm,
	202	const struct i915_ggtt_view *view)
	203	{
2bf0d267 TU	204	ptrdiff_t cmp;
2bf0d267 TU	205
4d1368f7	206	GEM_BUG_ON(view && !i915_is_ggtt(vm));
b42fe9ca	207
2bf0d267 TU	208	cmp = ptrdiff(vma->vm, vm);
	209	if (cmp)
	210	return cmp;
b42fe9ca	211
992e418d CW	212	BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL != 0);
992e418d CW	213	cmp = vma->ggtt_view.type;
b42fe9ca	214	if (!view)
992e418d	215	return cmp;
b42fe9ca	216
992e418d CW	217	cmp -= view->type;
	218	if (cmp)
	219	return cmp;
b42fe9ca	220
992e418d CW	221	/* ggtt_view.type also encodes its size so that we both distinguish
	222	* different views using it as a "type" and also use a compact (no
	223	* accessing of uninitialised padding bytes) memcmp without storing
	224	* an extra parameter or adding more code.
8bab1193 CW	225	*
	226	* To ensure that the memcmp is valid for all branches of the union,
	227	* even though the code looks like it is just comparing one branch,
	228	* we assert above that all branches have the same address, and that
	229	* each branch has a unique type/size.
992e418d CW	230	*/
	231	BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
	232	BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
8bab1193 CW	233	BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
	234	offsetof(typeof(*view), partial));
	235	return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
b42fe9ca JL	236	}
	237
	238	int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
	239	u32 flags);
	240	bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
782a3e9e CW	241	bool i915_vma_misplaced(const struct i915_vma *vma,
782a3e9e CW	242	u64 size, u64 alignment, u64 flags);
b42fe9ca JL	243	void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
b42fe9ca JL	244	int __must_check i915_vma_unbind(struct i915_vma *vma);
4ff4b44c	245	void i915_vma_unlink_ctx(struct i915_vma *vma);
b42fe9ca	246	void i915_vma_close(struct i915_vma *vma);
b42fe9ca JL	247
	248	int __i915_vma_do_pin(struct i915_vma *vma,
	249	u64 size, u64 alignment, u64 flags);
	250	static inline int __must_check
	251	i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
	252	{
	253	BUILD_BUG_ON(PIN_MBZ != I915_VMA_PIN_OVERFLOW);
	254	BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
	255	BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
	256
	257	/* Pin early to prevent the shrinker/eviction logic from destroying
	258	* our vma as we insert and bind.
	259	*/
0325701a CW	260	if (likely(((++vma->flags ^ flags) & I915_VMA_BIND_MASK) == 0)) {
	261	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
	262	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
b42fe9ca	263	return 0;
0325701a	264	}
b42fe9ca JL	265
	266	return __i915_vma_do_pin(vma, size, alignment, flags);
	267	}
	268
	269	static inline int i915_vma_pin_count(const struct i915_vma *vma)
	270	{
	271	return vma->flags & I915_VMA_PIN_MASK;
	272	}
	273
	274	static inline bool i915_vma_is_pinned(const struct i915_vma *vma)
	275	{
	276	return i915_vma_pin_count(vma);
	277	}
	278
	279	static inline void __i915_vma_pin(struct i915_vma *vma)
	280	{
	281	vma->flags++;
	282	GEM_BUG_ON(vma->flags & I915_VMA_PIN_OVERFLOW);
	283	}
	284
	285	static inline void __i915_vma_unpin(struct i915_vma *vma)
	286	{
	287	GEM_BUG_ON(!i915_vma_is_pinned(vma));
	288	vma->flags--;
	289	}
	290
	291	static inline void i915_vma_unpin(struct i915_vma *vma)
	292	{
	293	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
	294	__i915_vma_unpin(vma);
	295	}
	296
	297	/**
	298	* i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
	299	* @vma: VMA to iomap
	300	*
	301	* The passed in VMA has to be pinned in the global GTT mappable region.
	302	* An extra pinning of the VMA is acquired for the return iomapping,
	303	* the caller must call i915_vma_unpin_iomap to relinquish the pinning
	304	* after the iomapping is no longer required.
	305	*
	306	* Callers must hold the struct_mutex.
	307	*
	308	* Returns a valid iomapped pointer or ERR_PTR.
	309	*/
	310	void __iomem i915_vma_pin_iomap(struct i915_vma vma);
	311	#define IO_ERR_PTR(x) ((void __iomem *)ERR_PTR(x))
	312
	313	/**
	314	* i915_vma_unpin_iomap - unpins the mapping returned from i915_vma_iomap
	315	* @vma: VMA to unpin
	316	*
	317	* Unpins the previously iomapped VMA from i915_vma_pin_iomap().
	318	*
	319	* Callers must hold the struct_mutex. This function is only valid to be
	320	* called on a VMA previously iomapped by the caller with i915_vma_pin_iomap().
	321	*/
	322	static inline void i915_vma_unpin_iomap(struct i915_vma *vma)
	323	{
49d73912	324	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
b42fe9ca JL	325	GEM_BUG_ON(vma->iomap == NULL);
	326	i915_vma_unpin(vma);
	327	}
	328
	329	static inline struct page i915_vma_first_page(struct i915_vma vma)
	330	{
	331	GEM_BUG_ON(!vma->pages);
	332	return sg_page(vma->pages->sgl);
	333	}
	334
	335	/**
	336	* i915_vma_pin_fence - pin fencing state
	337	* @vma: vma to pin fencing for
	338	*
	339	* This pins the fencing state (whether tiled or untiled) to make sure the
	340	* vma (and its object) is ready to be used as a scanout target. Fencing
	341	* status must be synchronize first by calling i915_vma_get_fence():
	342	*
	343	* The resulting fence pin reference must be released again with
	344	* i915_vma_unpin_fence().
	345	*
	346	* Returns:
	347	*
	348	* True if the vma has a fence, false otherwise.
	349	*/
	350	static inline bool
	351	i915_vma_pin_fence(struct i915_vma *vma)
	352	{
49d73912	353	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
b42fe9ca JL	354	if (vma->fence) {
	355	vma->fence->pin_count++;
	356	return true;
	357	} else
	358	return false;
	359	}
	360
	361	/**
	362	* i915_vma_unpin_fence - unpin fencing state
	363	* @vma: vma to unpin fencing for
	364	*
	365	* This releases the fence pin reference acquired through
	366	* i915_vma_pin_fence. It will handle both objects with and without an
	367	* attached fence correctly, callers do not need to distinguish this.
	368	*/
	369	static inline void
	370	i915_vma_unpin_fence(struct i915_vma *vma)
	371	{
49d73912	372	lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
b42fe9ca JL	373	if (vma->fence) {
	374	GEM_BUG_ON(vma->fence->pin_count <= 0);
	375	vma->fence->pin_count--;
	376	}
	377	}
	378
	379	#endif
	380