Viewing file:  drm_vram_mm_helper.h (2.86 KB) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef DRM_VRAM_MM_HELPER_H
#define DRM_VRAM_MM_HELPER_H
#include <drm/drm_file.h>
#include <drm/drm_ioctl.h>
#include <drm/ttm/ttm_bo_driver.h>
struct drm_device;
/**
* struct drm_vram_mm_funcs - Callback functions for &struct drm_vram_mm
* @evict_flags: Provides an implementation for struct \
&ttm_bo_driver.evict_flags
* @verify_access: Provides an implementation for \
struct &ttm_bo_driver.verify_access
*
* These callback function integrate VRAM MM with TTM buffer objects. New
* functions can be added if necessary.
*/
struct drm_vram_mm_funcs {
void (*evict_flags)(struct ttm_buffer_object *bo,
struct ttm_placement *placement);
int (*verify_access)(struct ttm_buffer_object *bo, struct file *filp);
};
/**
* struct drm_vram_mm - An instance of VRAM MM
* @vram_base: Base address of the managed video memory
* @vram_size: Size of the managed video memory in bytes
* @bdev: The TTM BO device.
* @funcs: TTM BO functions
*
* The fields &struct drm_vram_mm.vram_base and
* &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
* available for public read access. Use the field
* &struct drm_vram_mm.bdev to access the TTM BO device.
*/
struct drm_vram_mm {
uint64_t vram_base;
size_t vram_size;
struct ttm_bo_device bdev;
const struct drm_vram_mm_funcs *funcs;
};
/**
* drm_vram_mm_of_bdev() - \
Returns the container of type &struct ttm_bo_device for field bdev.
* @bdev: the TTM BO device
*
* Returns:
* The containing instance of &struct drm_vram_mm
*/
static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
struct ttm_bo_device *bdev)
{
return container_of(bdev, struct drm_vram_mm, bdev);
}
int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
uint64_t vram_base, size_t vram_size,
const struct drm_vram_mm_funcs *funcs);
void drm_vram_mm_cleanup(struct drm_vram_mm *vmm);
int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
struct drm_vram_mm *vmm);
/*
* Helpers for integration with struct drm_device
*/
struct drm_vram_mm *drm_vram_helper_alloc_mm(
struct drm_device *dev, uint64_t vram_base, size_t vram_size,
const struct drm_vram_mm_funcs *funcs);
void drm_vram_helper_release_mm(struct drm_device *dev);
/*
* Helpers for &struct file_operations
*/
int drm_vram_mm_file_operations_mmap(
struct file *filp, struct vm_area_struct *vma);
/**
* define DRM_VRAM_MM_FILE_OPERATIONS - default callback functions for \
&struct file_operations
*
* Drivers that use VRAM MM can use this macro to initialize
* &struct file_operations with default functions.
*/
#define DRM_VRAM_MM_FILE_OPERATIONS \
.llseek = no_llseek, \
.read = drm_read, \
.poll = drm_poll, \
.unlocked_ioctl = drm_ioctl, \
.compat_ioctl = drm_compat_ioctl, \
.mmap = drm_vram_mm_file_operations_mmap, \
.open = drm_open, \
.release = drm_release \
#endif
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