drm_gem_vram_helper.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef DRM_GEM_VRAM_HELPER_H
#define DRM_GEM_VRAM_HELPER_H
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_modes.h>
#include <drm/ttm/ttm_bo_api.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <linux/kernel.h> /* for container_of() */
struct drm_mode_create_dumb;
struct drm_plane;
struct drm_plane_state;
struct drm_simple_display_pipe;
struct filp;
struct vm_area_struct;
#define DRM_GEM_VRAM_PL_FLAG_SYSTEM (1 << 0)
#define DRM_GEM_VRAM_PL_FLAG_VRAM (1 << 1)
#define DRM_GEM_VRAM_PL_FLAG_TOPDOWN (1 << 2)
/*
* 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.
*
* GEM VRAM objects perform reference counting for pin and mapping
* operations. So a buffer object that has been pinned N times with
* drm_gem_vram_pin() must be unpinned N times with
* drm_gem_vram_unpin(). The same applies to pairs of
* drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of
* drm_gem_vram_vmap() and drm_gem_vram_vunmap().
*/
struct drm_gem_vram_object {
struct ttm_buffer_object bo;
struct ttm_bo_kmap_obj kmap;
/**
* @kmap_use_count:
*
* Reference count on the virtual address.
* The address are un-mapped when the count reaches zero.
*/
unsigned int kmap_use_count;
/* 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, bo.base);
}
struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
size_t size,
unsigned long pg_align);
void drm_gem_vram_put(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);
void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo);
void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr);
int drm_gem_vram_fill_create_dumb(struct drm_file *file,
struct drm_device *dev,
unsigned long pg_align,
unsigned long pitch_align,
struct drm_mode_create_dumb *args);
/*
* Helpers for struct drm_driver
*/
int drm_gem_vram_driver_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
struct drm_device *dev,
uint32_t handle, uint64_t *offset);
/*
* Helpers for struct drm_plane_helper_funcs
*/
int
drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *new_state);
void
drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state);
/*
* Helpers for struct drm_simple_display_pipe_funcs
*/
int drm_gem_vram_simple_display_pipe_prepare_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *new_state);
void drm_gem_vram_simple_display_pipe_cleanup_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state);
/**
* define DRM_GEM_VRAM_DRIVER - default callback functions for \
&struct drm_driver
*
* Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
* &struct drm_driver with default functions.
*/
#define DRM_GEM_VRAM_DRIVER \
.debugfs_init = drm_vram_mm_debugfs_init, \
.dumb_create = drm_gem_vram_driver_dumb_create, \
.dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \
.gem_prime_mmap = drm_gem_prime_mmap
/*
* VRAM memory manager
*/
/**
* 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;
};
/**
* 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);
}
void drm_vram_mm_debugfs_init(struct drm_minor *minor);
/*
* 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);
void drm_vram_helper_release_mm(struct drm_device *dev);
int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base,
size_t vram_size);
/*
* Mode-config helpers
*/
enum drm_mode_status
drm_vram_helper_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode);
#endif