drm_gem_shmem_helper.h | Explore in Territory

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

#ifndef __DRM_GEM_SHMEM_HELPER_H__
#define __DRM_GEM_SHMEM_HELPER_H__

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mutex.h>

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

struct dma_buf_attachment;
struct drm_mode_create_dumb;
struct drm_printer;
struct sg_table;

/**
 * struct drm_gem_shmem_object - GEM object backed by shmem
 */
struct drm_gem_shmem_object { … };

#define to_drm_gem_shmem_obj(obj) …

struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem);

void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem);
int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem);
void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem);
int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem,
		       struct iosys_map *map);
void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
			  struct iosys_map *map);
int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct *vma);

int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem);
void drm_gem_shmem_unpin_locked(struct drm_gem_shmem_object *shmem);

int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv);

static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
{ … }

void drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem);

struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem);
struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem);

void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
			      struct drm_printer *p, unsigned int indent);

extern const struct vm_operations_struct drm_gem_shmem_vm_ops;

/*
 * GEM object functions
 */

/**
 * drm_gem_shmem_object_free - GEM object function for drm_gem_shmem_free()
 * @obj: GEM object to free
 *
 * This function wraps drm_gem_shmem_free(). Drivers that employ the shmem helpers
 * should use it as their &drm_gem_object_funcs.free handler.
 */
static inline void drm_gem_shmem_object_free(struct drm_gem_object *obj)
{ … }

/**
 * drm_gem_shmem_object_print_info() - Print &drm_gem_shmem_object info for debugfs
 * @p: DRM printer
 * @indent: Tab indentation level
 * @obj: GEM object
 *
 * This function wraps drm_gem_shmem_print_info(). Drivers that employ the shmem helpers should
 * use this function as their &drm_gem_object_funcs.print_info handler.
 */
static inline void drm_gem_shmem_object_print_info(struct drm_printer *p, unsigned int indent,
						   const struct drm_gem_object *obj)
{ … }

/**
 * drm_gem_shmem_object_pin - GEM object function for drm_gem_shmem_pin()
 * @obj: GEM object
 *
 * This function wraps drm_gem_shmem_pin(). Drivers that employ the shmem helpers should
 * use it as their &drm_gem_object_funcs.pin handler.
 */
static inline int drm_gem_shmem_object_pin(struct drm_gem_object *obj)
{ … }

/**
 * drm_gem_shmem_object_unpin - GEM object function for drm_gem_shmem_unpin()
 * @obj: GEM object
 *
 * This function wraps drm_gem_shmem_unpin(). Drivers that employ the shmem helpers should
 * use it as their &drm_gem_object_funcs.unpin handler.
 */
static inline void drm_gem_shmem_object_unpin(struct drm_gem_object *obj)
{ … }

/**
 * drm_gem_shmem_object_get_sg_table - GEM object function for drm_gem_shmem_get_sg_table()
 * @obj: GEM object
 *
 * This function wraps drm_gem_shmem_get_sg_table(). Drivers that employ the shmem 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 error pointer on failure.
 */
static inline struct sg_table *drm_gem_shmem_object_get_sg_table(struct drm_gem_object *obj)
{ … }

/*
 * drm_gem_shmem_object_vmap - GEM object function for drm_gem_shmem_vmap()
 * @obj: GEM object
 * @map: Returns the kernel virtual address of the SHMEM GEM object's backing store.
 *
 * This function wraps drm_gem_shmem_vmap(). Drivers that employ the shmem 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_shmem_object_vmap(struct drm_gem_object *obj,
					    struct iosys_map *map)
{ … }

/*
 * drm_gem_shmem_object_vunmap - GEM object function for drm_gem_shmem_vunmap()
 * @obj: GEM object
 * @map: Kernel virtual address where the SHMEM GEM object was mapped
 *
 * This function wraps drm_gem_shmem_vunmap(). Drivers that employ the shmem helpers should
 * use it as their &drm_gem_object_funcs.vunmap handler.
 */
static inline void drm_gem_shmem_object_vunmap(struct drm_gem_object *obj,
					       struct iosys_map *map)
{ … }

/**
 * drm_gem_shmem_object_mmap - GEM object function for drm_gem_shmem_mmap()
 * @obj: GEM object
 * @vma: VMA for the area to be mapped
 *
 * This function wraps drm_gem_shmem_mmap(). Drivers that employ the shmem helpers should
 * use it as their &drm_gem_object_funcs.mmap handler.
 *
 * Returns:
 * 0 on success or a negative error code on failure.
 */
static inline int drm_gem_shmem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{ … }

/*
 * Driver ops
 */

struct drm_gem_object *
drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
				    struct dma_buf_attachment *attach,
				    struct sg_table *sgt);
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
			      struct drm_mode_create_dumb *args);

/**
 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations
 *
 * This macro provides a shortcut for setting the shmem GEM operations in
 * the &drm_driver structure.
 */
#define DRM_GEM_SHMEM_DRIVER_OPS …

#endif /* __DRM_GEM_SHMEM_HELPER_H__ */
linux/include/drm/drm_gem_shmem_helper.h
