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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* exynos_drm_gem.h
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Authoer: Inki Dae <>
#ifndef _EXYNOS_DRM_GEM_H_
#define _EXYNOS_DRM_GEM_H_
#include <drm/drm_gem.h>
#include <linux/mm_types.h>
#define to_exynos_gem(x) container_of(x, struct exynos_drm_gem, base)
* exynos drm buffer structure.
* @base: a gem object.
* - a new handle to this gem object would be created
* by drm_gem_handle_create().
* @flags: indicate memory type to allocated buffer and cache attruibute.
* @size: size requested from user, in bytes and this size is aligned
* in page unit.
* @cookie: cookie returned by dma_alloc_attrs
* @kvaddr: kernel virtual address to allocated memory region (for fbdev)
* @dma_addr: bus address(accessed by dma) to allocated memory region.
* - this address could be physical address without IOMMU and
* device address with IOMMU.
* @dma_attrs: attrs passed dma mapping framework
* @sgt: Imported sg_table.
* P.S. this object would be transferred to user as kms_bo.handle so
* user can access the buffer through kms_bo.handle.
struct exynos_drm_gem {
struct drm_gem_object base;
unsigned int flags;
unsigned long size;
void *cookie;
void *kvaddr;
dma_addr_t dma_addr;
unsigned long dma_attrs;
struct sg_table *sgt;
/* destroy a buffer with gem object */
void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem);
/* create a new buffer with gem object */
struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
unsigned int flags,
unsigned long size,
bool kvmap);
* request gem object creation and buffer allocation as the size
* that it is calculated with framebuffer information such as width,
* height and bpp.
int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
/* get fake-offset of gem object that can be used with mmap. */
int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
* get exynos drm object from gem handle, this function could be used for
* other drivers such as 2d/3d acceleration drivers.
* with this function call, gem object reference count would be increased.
struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
unsigned int gem_handle);
* put exynos drm object acquired from exynos_drm_gem_get(),
* gem object reference count would be decreased.
static inline void exynos_drm_gem_put(struct exynos_drm_gem *exynos_gem)
/* get buffer information to memory region allocated by gem. */
int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
/* free gem object. */
void exynos_drm_gem_free_object(struct drm_gem_object *obj);
/* create memory region for drm framebuffer. */
int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
/* set vm_flags and we can change the vm attribute to other one at here. */
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
/* low-level interface prime helpers */
struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *
exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma);