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37a48adfba
The kmap and kunmap operations of GEM VRAM buffers can now be called in interleaving pairs. The first call to drm_gem_vram_kmap() maps the buffer's memory to kernel address space and the final call to drm_gem_vram_kunmap() unmaps the memory. Intermediate calls to these functions increment or decrement a reference counter. This change allows for keeping buffer memory mapped for longer and minimizes the amount of changes to TLB, page tables, etc. v4: * lock in kmap()/kunmap() with ttm_bo_reserve() Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reported-and-tested-by: Davidlohr Bueso <dbueso@suse.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190906122056.32018-2-tzimmermann@suse.de
143 lines
4.2 KiB
C
143 lines
4.2 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_gem.h>
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#include <drm/ttm/ttm_bo_api.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_vram_mm_funcs;
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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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/*
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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().
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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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struct ttm_bo_device *bdev,
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size_t size,
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unsigned long pg_align,
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bool interruptible);
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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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int drm_gem_vram_fill_create_dumb(struct drm_file *file,
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struct drm_device *dev,
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struct ttm_bo_device *bdev,
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unsigned long pg_align,
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bool interruptible,
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struct drm_mode_create_dumb *args);
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/*
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* Helpers for struct ttm_bo_driver
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*/
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void drm_gem_vram_bo_driver_evict_flags(struct ttm_buffer_object *bo,
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struct ttm_placement *pl);
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int drm_gem_vram_bo_driver_verify_access(struct ttm_buffer_object *bo,
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struct file *filp);
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extern const struct drm_vram_mm_funcs drm_gem_vram_mm_funcs;
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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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* 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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.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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#endif
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