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7ce84471e3
As a result of commit 987d65d013 (drm: debugfs: make
drm_debugfs_create_files() never fail) and changes to various debugfs
functions in drm/core and across various drivers, there is no need for
the drm_driver.debugfs_init() hook to have a return value. Therefore,
declare it as void.
This also includes refactoring all users of the .debugfs_init() hook to
return void across the subsystem.
v2: include changes to the hook and drivers that use it in one patch to
prevent driver breakage and enable individual successful compilation of
this change.
References: https://lists.freedesktop.org/archives/dri-devel/2020-February/257183.html
Signed-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200310133121.27913-18-wambui.karugax@gmail.com
218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef DRM_GEM_VRAM_HELPER_H
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#define DRM_GEM_VRAM_HELPER_H
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#include <drm/drm_file.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_ioctl.h>
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#include <drm/drm_modes.h>
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#include <drm/ttm/ttm_bo_api.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_placement.h>
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#include <linux/kernel.h> /* for container_of() */
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struct drm_mode_create_dumb;
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struct drm_plane;
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struct drm_plane_state;
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struct drm_simple_display_pipe;
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struct filp;
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struct vm_area_struct;
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#define DRM_GEM_VRAM_PL_FLAG_VRAM TTM_PL_FLAG_VRAM
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#define DRM_GEM_VRAM_PL_FLAG_SYSTEM TTM_PL_FLAG_SYSTEM
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#define DRM_GEM_VRAM_PL_FLAG_TOPDOWN TTM_PL_FLAG_TOPDOWN
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/*
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* Buffer-object helpers
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*/
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/**
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* struct drm_gem_vram_object - GEM object backed by VRAM
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* @gem: GEM object
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* @bo: TTM buffer object
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* @kmap: Mapping information for @bo
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* @placement: TTM placement information. Supported placements are \
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%TTM_PL_VRAM and %TTM_PL_SYSTEM
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* @placements: TTM placement information.
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* @pin_count: Pin counter
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*
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* The type struct drm_gem_vram_object represents a GEM object that is
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* backed by VRAM. It can be used for simple framebuffer devices with
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* dedicated memory. The buffer object can be evicted to system memory if
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* video memory becomes scarce.
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*
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* GEM VRAM objects perform reference counting for pin and mapping
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* operations. So a buffer object that has been pinned N times with
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* drm_gem_vram_pin() must be unpinned N times with
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* drm_gem_vram_unpin(). The same applies to pairs of
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* drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of
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* drm_gem_vram_vmap() and drm_gem_vram_vunmap().
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*/
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struct drm_gem_vram_object {
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struct ttm_buffer_object bo;
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struct ttm_bo_kmap_obj kmap;
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/**
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* @kmap_use_count:
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*
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* Reference count on the virtual address.
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* The address are un-mapped when the count reaches zero.
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*/
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unsigned int kmap_use_count;
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/* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
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struct ttm_placement placement;
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struct ttm_place placements[2];
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int pin_count;
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};
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/**
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* Returns the container of type &struct drm_gem_vram_object
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* for field bo.
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* @bo: the VRAM buffer object
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* Returns: The containing GEM VRAM object
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*/
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static inline struct drm_gem_vram_object *drm_gem_vram_of_bo(
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struct ttm_buffer_object *bo)
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{
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return container_of(bo, struct drm_gem_vram_object, bo);
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}
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/**
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* Returns the container of type &struct drm_gem_vram_object
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* for field gem.
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* @gem: the GEM object
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* Returns: The containing GEM VRAM object
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*/
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static inline struct drm_gem_vram_object *drm_gem_vram_of_gem(
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struct drm_gem_object *gem)
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{
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return container_of(gem, struct drm_gem_vram_object, bo.base);
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}
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struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
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size_t size,
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unsigned long pg_align);
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void drm_gem_vram_put(struct drm_gem_vram_object *gbo);
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u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
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s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
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int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
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int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
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void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
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bool *is_iomem);
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void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);
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void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo);
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void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr);
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int drm_gem_vram_fill_create_dumb(struct drm_file *file,
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struct drm_device *dev,
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unsigned long pg_align,
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unsigned long pitch_align,
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struct drm_mode_create_dumb *args);
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/*
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* Helpers for struct drm_driver
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*/
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int drm_gem_vram_driver_dumb_create(struct drm_file *file,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
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struct drm_device *dev,
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uint32_t handle, uint64_t *offset);
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/*
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* Helpers for struct drm_plane_helper_funcs
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*/
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int
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drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
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struct drm_plane_state *new_state);
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void
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drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
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struct drm_plane_state *old_state);
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/*
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* Helpers for struct drm_simple_display_pipe_funcs
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*/
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int drm_gem_vram_simple_display_pipe_prepare_fb(
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struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *new_state);
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void drm_gem_vram_simple_display_pipe_cleanup_fb(
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struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *old_state);
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/**
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* define DRM_GEM_VRAM_DRIVER - default callback functions for \
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&struct drm_driver
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*
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* Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
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* &struct drm_driver with default functions.
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*/
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#define DRM_GEM_VRAM_DRIVER \
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.debugfs_init = drm_vram_mm_debugfs_init, \
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.dumb_create = drm_gem_vram_driver_dumb_create, \
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.dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \
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.gem_prime_mmap = drm_gem_prime_mmap
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/*
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* VRAM memory manager
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*/
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/**
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* struct drm_vram_mm - An instance of VRAM MM
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* @vram_base: Base address of the managed video memory
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* @vram_size: Size of the managed video memory in bytes
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* @bdev: The TTM BO device.
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* @funcs: TTM BO functions
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*
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* The fields &struct drm_vram_mm.vram_base and
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* &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
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* available for public read access. Use the field
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* &struct drm_vram_mm.bdev to access the TTM BO device.
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*/
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struct drm_vram_mm {
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uint64_t vram_base;
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size_t vram_size;
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struct ttm_bo_device bdev;
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};
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/**
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* drm_vram_mm_of_bdev() - \
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Returns the container of type &struct ttm_bo_device for field bdev.
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* @bdev: the TTM BO device
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*
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* Returns:
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* The containing instance of &struct drm_vram_mm
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*/
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static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
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struct ttm_bo_device *bdev)
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{
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return container_of(bdev, struct drm_vram_mm, bdev);
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}
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void drm_vram_mm_debugfs_init(struct drm_minor *minor);
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/*
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* Helpers for integration with struct drm_device
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*/
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struct drm_vram_mm *drm_vram_helper_alloc_mm(
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struct drm_device *dev, uint64_t vram_base, size_t vram_size);
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void drm_vram_helper_release_mm(struct drm_device *dev);
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/*
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* Mode-config helpers
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*/
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enum drm_mode_status
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drm_vram_helper_mode_valid(struct drm_device *dev,
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const struct drm_display_mode *mode);
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#endif
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