alistair23-linux/drivers/gpu/drm/i915/gem/i915_gem_object.h

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2016 Intel Corporation
 */

#ifndef __I915_GEM_OBJECT_H__
#define __I915_GEM_OBJECT_H__

#include <drm/drm_gem.h>
#include <drm/drm_file.h>
#include <drm/drm_device.h>

#include <drm/i915_drm.h>

#include "i915_gem_object_types.h"

#include "i915_gem_gtt.h"

void i915_gem_init__objects(struct drm_i915_private *i915);

struct drm_i915_gem_object *i915_gem_object_alloc(void);
void i915_gem_object_free(struct drm_i915_gem_object *obj);

void i915_gem_object_init(struct drm_i915_gem_object *obj,
			  const struct drm_i915_gem_object_ops *ops);
struct drm_i915_gem_object *
i915_gem_object_create_shmem(struct drm_i915_private *i915, u64 size);
struct drm_i915_gem_object *
i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
				       const void *data, size_t size);

extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
				     struct sg_table *pages,
				     bool needs_clflush);

int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align);

void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
void i915_gem_free_object(struct drm_gem_object *obj);

void i915_gem_flush_free_objects(struct drm_i915_private *i915);

struct sg_table *
__i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
void i915_gem_object_truncate(struct drm_i915_gem_object *obj);

/**
 * 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
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_get(&obj->base);
	return obj;
}

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

#define assert_object_held(obj) reservation_object_assert_held((obj)->base.resv)

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

static inline int
i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj)
{
	return reservation_object_lock_interruptible(obj->base.resv, NULL);
}

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

struct dma_fence *
i915_gem_object_lock_fence(struct drm_i915_gem_object *obj);
void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
				  struct dma_fence *fence);

static inline void
i915_gem_object_set_readonly(struct drm_i915_gem_object *obj)
{
	obj->base.vma_node.readonly = true;
}

static inline bool
i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
{
	return obj->base.vma_node.readonly;
}

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_proxy(const struct drm_i915_gem_object *obj)
{
	return obj->ops->flags & I915_GEM_OBJECT_IS_PROXY;
}

static inline bool
i915_gem_object_needs_async_cancel(const struct drm_i915_gem_object *obj)
{
	return obj->ops->flags & I915_GEM_OBJECT_ASYNC_CANCEL;
}

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

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

static inline bool
i915_gem_object_is_tiled(const 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(const 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(const 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(const 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);

struct scatterlist *
i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
		       unsigned int n, unsigned int *offset);

struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj,
			 unsigned int n);

struct page *
i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
			       unsigned int n);

dma_addr_t
i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
				    unsigned long n,
				    unsigned int *len);

dma_addr_t
i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
				unsigned long n);

void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
				 struct sg_table *pages,
				 unsigned int sg_page_sizes);

int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);

static inline int __must_check
i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
	might_lock(&obj->mm.lock);

	if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
		return 0;

	return __i915_gem_object_get_pages(obj);
}

static inline bool
i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
{
	return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
}

static inline void
__i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
	GEM_BUG_ON(!i915_gem_object_has_pages(obj));

	atomic_inc(&obj->mm.pages_pin_count);
}

static inline bool
i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
{
	return atomic_read(&obj->mm.pages_pin_count);
}

static inline void
__i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
{
	GEM_BUG_ON(!i915_gem_object_has_pages(obj));
	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));

	atomic_dec(&obj->mm.pages_pin_count);
}

static inline void
i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
{
	__i915_gem_object_unpin_pages(obj);
}

enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock/struct_mutex */
	I915_MM_NORMAL = 0,
	I915_MM_SHRINKER /* called "recursively" from direct-reclaim-esque */
};

int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
				enum i915_mm_subclass subclass);
void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
void i915_gem_object_writeback(struct drm_i915_gem_object *obj);

enum i915_map_type {
	I915_MAP_WB = 0,
	I915_MAP_WC,
#define I915_MAP_OVERRIDE BIT(31)
	I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
	I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
};

/**
 * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 * @obj: the object to map into kernel address space
 * @type: the type of mapping, used to select pgprot_t
 *
 * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
 * pages and then returns a contiguous mapping of the backing storage into
 * the kernel address space. Based on the @type of mapping, the PTE will be
 * set to either WriteBack or WriteCombine (via pgprot_t).
 *
 * The caller is responsible for calling i915_gem_object_unpin_map() when the
 * mapping is no longer required.
 *
 * Returns the pointer through which to access the mapped object, or an
 * ERR_PTR() on error.
 */
void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
					   enum i915_map_type type);

void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
				 unsigned long offset,
				 unsigned long size);
static inline void i915_gem_object_flush_map(struct drm_i915_gem_object *obj)
{
	__i915_gem_object_flush_map(obj, 0, obj->base.size);
}

/**
 * i915_gem_object_unpin_map - releases an earlier mapping
 * @obj: the object to unmap
 *
 * After pinning the object and mapping its pages, once you are finished
 * with your access, call i915_gem_object_unpin_map() to release the pin
 * upon the mapping. Once the pin count reaches zero, that mapping may be
 * removed.
 */
static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
{
	i915_gem_object_unpin_pages(obj);
}

void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj);
void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj);

void
i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
				   unsigned int flush_domains);

int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
				 unsigned int *needs_clflush);
int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
				  unsigned int *needs_clflush);
#define CLFLUSH_BEFORE	BIT(0)
#define CLFLUSH_AFTER	BIT(1)
#define CLFLUSH_FLAGS	(CLFLUSH_BEFORE | CLFLUSH_AFTER)

static inline void
i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
{
	i915_gem_object_unpin_pages(obj);
	i915_gem_object_unlock(obj);
}

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->base.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);

int __must_check
i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
int __must_check
i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
int __must_check
i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
struct i915_vma * __must_check
i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
				     u32 alignment,
				     const struct i915_ggtt_view *view,
				     unsigned int flags);
void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);

void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);
void i915_gem_object_make_purgeable(struct drm_i915_gem_object *obj);

static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
{
	if (obj->cache_dirty)
		return false;

	if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
		return true;

	return obj->pin_global; /* currently in use by HW, keep flushed */
}

static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
{
	obj->read_domains = I915_GEM_DOMAIN_CPU;
	obj->write_domain = I915_GEM_DOMAIN_CPU;
	if (cpu_write_needs_clflush(obj))
		obj->cache_dirty = true;
}

int i915_gem_object_wait(struct drm_i915_gem_object *obj,
			 unsigned int flags,
			 long timeout);
int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
				  unsigned int flags,
				  const struct i915_sched_attr *attr);
#define I915_PRIORITY_DISPLAY I915_USER_PRIORITY(I915_PRIORITY_MAX)

#endif