forked from Minki/linux
59f5989ad4
There's now a pointer to struct drm_vram_mm stored in struct drm_device. DRM drivers that use VRAM MM should use this field to refer to their instance of the data structure. Appropriate helpers are now provided as well. Adding struct drm_vram_mm to struct drm_device further avoids wrappers and boilerplate code in drivers. This patch implements default functions for callbacks in struct drm_driver and struct file_operations that use the struct drm_vram_mm stored in struct drm_device. Drivers that need to provide their own implementations can still do so. The patch also adds documentation for the VRAM helper library in general. v5: * set .llseek to no_llseek() from DRM_VRAM_MM_FILE_OPERATIONS v4: * cleanups from checkpatch.pl * document VRAM helper library Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-9-tzimmermann@suse.de Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef DRM_VRAM_MM_HELPER_H
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#define DRM_VRAM_MM_HELPER_H
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#include <drm/ttm/ttm_bo_driver.h>
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struct drm_device;
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/**
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* struct drm_vram_mm_funcs - Callback functions for &struct drm_vram_mm
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* @evict_flags: Provides an implementation for struct \
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&ttm_bo_driver.evict_flags
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* @verify_access: Provides an implementation for \
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struct &ttm_bo_driver.verify_access
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*
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* These callback function integrate VRAM MM with TTM buffer objects. New
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* functions can be added if necessary.
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*/
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struct drm_vram_mm_funcs {
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void (*evict_flags)(struct ttm_buffer_object *bo,
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struct ttm_placement *placement);
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int (*verify_access)(struct ttm_buffer_object *bo, struct file *filp);
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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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const struct drm_vram_mm_funcs *funcs;
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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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int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
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uint64_t vram_base, size_t vram_size,
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const struct drm_vram_mm_funcs *funcs);
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void drm_vram_mm_cleanup(struct drm_vram_mm *vmm);
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int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
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struct drm_vram_mm *vmm);
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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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const struct drm_vram_mm_funcs *funcs);
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void drm_vram_helper_release_mm(struct drm_device *dev);
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/*
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* Helpers for &struct file_operations
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*/
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int drm_vram_mm_file_operations_mmap(
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struct file *filp, struct vm_area_struct *vma);
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/**
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* define DRM_VRAM_MM_FILE_OPERATIONS - default callback functions for \
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&struct file_operations
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*
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* Drivers that use VRAM MM can use this macro to initialize
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* &struct file_operations with default functions.
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*/
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#define DRM_VRAM_MM_FILE_OPERATIONS \
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.llseek = no_llseek, \
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.read = drm_read, \
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.poll = drm_poll, \
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.unlocked_ioctl = drm_ioctl, \
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.compat_ioctl = drm_compat_ioctl, \
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.mmap = drm_vram_mm_file_operations_mmap, \
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.open = drm_open, \
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.release = drm_release \
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#endif
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