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     -ˆÌËƒ}§^Ê¿Í %    -/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __DRM_GEM_DMA_HELPER_H__
#define __DRM_GEM_DMA_HELPER_H__

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

struct drm_mode_create_dumb;

/**
 * struct drm_gem_dma_object - GEM object backed by DMA memory allocations
 * @base: base GEM object
 * @dma_addr: DMA address of the backing memory
 * @sgt: scatter/gather table for imported PRIME buffers. The table can have
 *       more than one entry but they are guaranteed to have contiguous
 *       DMA addresses.
 * @vaddr: kernel virtual address of the backing memory
 * @map_noncoherent: if true, the GEM object is backed by non-coherent memory
 */
struct drm_gem_dma_object {
	struct drm_gem_object base;
	dma_addr_t dma_addr;
	struct sg_table *sgt;

	/* For objects with DMA memory allocated by GEM DMA */
	void *vaddr;

	bool map_noncoherent;
};

#define to_drm_gem_dma_obj(gem_obj) \
	container_of(gem_obj, struct drm_gem_dma_object, base)

struct drm_gem_dma_object *drm_gem_dma_create(struct drm_device *drm,
					      size_t size);
void drm_gem_dma_free(struct drm_gem_dma_object *dma_obj);
void drm_gem_dma_print_info(const struct drm_gem_dma_object *dma_obj,
			    struct drm_printer *p, unsigned int indent);
struct sg_table *drm_gem_dma_get_sg_table(struct drm_gem_dma_object *dma_obj);
int drm_gem_dma_vmap(struct drm_gem_dma_object *dma_obj,
		     struct iosys_map *map);
int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *vma);

extern const struct vm_operations_struct drm_gem_dma_vm_ops;

/*
 * GEM object functions
 */

/**
 * drm_gem_dma_object_free - GEM object function for drm_gem_dma_free()
 * @obj: GEM object to free
 *
 * This function wraps drm_gem_dma_free_object(). Drivers that employ the DMA helpers
 * should use it as their &drm_gem_object_funcs.free handler.
 */
static inline void drm_gem_dma_object_free(struct drm_gem_object *obj)
{
	struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);

	drm_gem_dma_free(dma_obj);
}

/**
 * drm_gem_dma_object_print_info() - Print &drm_gem_dma_object info for debugfs
 * @p: DRM printer
 * @indent: Tab indentation level
 * @obj: GEM object
 *
 * This function wraps drm_gem_dma_print_info(). Drivers that employ the DMA helpers
 * should use this function as their &drm_gem_object_funcs.print_info handler.
 */
static inline void drm_gem_dma_object_print_info(struct drm_printer *p, unsigned int indent,
						 const struct drm_gem_object *obj)
{
	const struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);

	drm_gem_dma_print_info(dma_obj, p, indent);
}

/**
 * drm_gem_dma_object_get_sg_table - GEM object function for drm_gem_dma_get_sg_table()
 * @obj: GEM object
 *
 * This function wraps drm_gem_dma_get_sg_table(). Drivers that employ the DMA helpers should
 * use it as their &drm_gem_object_funcs.get_sg_table handler.
 *
 * Returns:
 * A pointer to the scatter/gather table of pinned pages or NULL on failure.
 */
static inline struct sg_table *drm_gem_dma_object_get_sg_table(struct drm_gem_object *obj)
{
	struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);

	return drm_gem_dma_get_sg_table(dma_obj);
}

/*
 * drm_gem_dma_object_vmap - GEM object function for drm_gem_dma_vmap()
 * @obj: GEM object
 * @map: Returns the kernel virtual address of the DMA GEM object's backing store.
 *
 * This function wraps drm_gem_dma_vmap(). Drivers that employ the DMA helpers should
 * use it as their &drm_gem_object_funcs.vmap handler.
 *
 * Returns:
 * 0 on success or a negative error code on failure.
 */
static inline int drm_gem_dma_object_vmap(struct drm_gem_object *obj,
					  struct iosys_map *map)
{
	struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);

	return drm_gem_dma_vmap(dma_obj, map);
}

/**
 * drm_gem_dma_object_mmap - GEM object function for drm_gem_dma_mmap()
 * @obj: GEM object
 * @vma: VMA for the area to be mapped
 *
 * This function wraps drm_gem_dma_mmap(). Drivers that employ the dma helpers should
 * use it as their &drm_gem_object_funcs.mmap handler.
 *