xref: /openbmc/linux/include/drm/drm_gem_vram_helper.h (revision 85438a8d)

/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef DRM_GEM_VRAM_HELPER_H
#define DRM_GEM_VRAM_HELPER_H

#include <drm/drm_gem.h>
#include <drm/ttm/ttm_bo_api.h>
#include <drm/ttm/ttm_placement.h>
#include <linux/kernel.h> /* for container_of() */

struct filp;

#define DRM_GEM_VRAM_PL_FLAG_VRAM	TTM_PL_FLAG_VRAM
#define DRM_GEM_VRAM_PL_FLAG_SYSTEM	TTM_PL_FLAG_SYSTEM

/*
 * Buffer-object helpers
 */

/**
 * struct drm_gem_vram_object - GEM object backed by VRAM
 * @gem:	GEM object
 * @bo:		TTM buffer object
 * @kmap:	Mapping information for @bo
 * @placement:	TTM placement information. Supported placements are \
	%TTM_PL_VRAM and %TTM_PL_SYSTEM
 * @placements:	TTM placement information.
 * @pin_count:	Pin counter
 *
 * The type struct drm_gem_vram_object represents a GEM object that is
 * backed by VRAM. It can be used for simple framebuffer devices with
 * dedicated memory. The buffer object can be evicted to system memory if
 * video memory becomes scarce.
 */
struct drm_gem_vram_object {
	struct drm_gem_object gem;
	struct ttm_buffer_object bo;
	struct ttm_bo_kmap_obj kmap;

	/* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
	struct ttm_placement placement;
	struct ttm_place placements[2];

	int pin_count;
};

/**
 * Returns the container of type &struct drm_gem_vram_object
 * for field bo.
 * @bo:		the VRAM buffer object
 * Returns:	The containing GEM VRAM object
 */
static inline struct drm_gem_vram_object *drm_gem_vram_of_bo(
	struct ttm_buffer_object *bo)
{
	return container_of(bo, struct drm_gem_vram_object, bo);
}

/**
 * Returns the container of type &struct drm_gem_vram_object
 * for field gem.
 * @gem:	the GEM object
 * Returns:	The containing GEM VRAM object
 */
static inline struct drm_gem_vram_object *drm_gem_vram_of_gem(
	struct drm_gem_object *gem)
{
	return container_of(gem, struct drm_gem_vram_object, gem);
}

struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
						struct ttm_bo_device *bdev,
						size_t size,
						unsigned long pg_align,
						bool interruptible);
void drm_gem_vram_put(struct drm_gem_vram_object *gbo);
int drm_gem_vram_reserve(struct drm_gem_vram_object *gbo, bool no_wait);
void drm_gem_vram_unreserve(struct drm_gem_vram_object *gbo);
u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
int drm_gem_vram_push_to_system(struct drm_gem_vram_object *gbo);
void *drm_gem_vram_kmap_at(struct drm_gem_vram_object *gbo, bool map,
			   bool *is_iomem, struct ttm_bo_kmap_obj *kmap);
void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
			bool *is_iomem);
void drm_gem_vram_kunmap_at(struct drm_gem_vram_object *gbo,
			    struct ttm_bo_kmap_obj *kmap);
void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);

#endif