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43676605f8
The new functions ttm_bo_{vmap,vunmap}() map and unmap a TTM BO in kernel
address space. The mapping's address is returned as struct dma_buf_map.
Each function is a simplified version of TTM's existing kmap code. Both
functions respect the memory's location ani/or writecombine flags.
On top TTM's functions, GEM TTM helpers got drm_gem_ttm_{vmap,vunmap}(),
two helpers that convert a GEM object into the TTM BO and forward the call
to TTM's vmap/vunmap. These helpers can be dropped into the rsp GEM object
callbacks.
v5:
* use size_t for storing mapping size (Christian)
* ignore premapped memory areas correctly in ttm_bo_vunmap()
* rebase onto latest TTM interfaces (Christian)
* remove BUG() from ttm_bo_vmap() (Christian)
v4:
* drop ttm_kmap_obj_to_dma_buf() in favor of vmap helpers (Daniel,
Christian)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201103093015.1063-6-tzimmermann@suse.de
27 lines
741 B
C
27 lines
741 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef DRM_GEM_TTM_HELPER_H
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#define DRM_GEM_TTM_HELPER_H
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#include <linux/kernel.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_device.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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struct dma_buf_map;
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#define drm_gem_ttm_of_gem(gem_obj) \
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container_of(gem_obj, struct ttm_buffer_object, base)
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void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
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const struct drm_gem_object *gem);
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int drm_gem_ttm_vmap(struct drm_gem_object *gem,
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struct dma_buf_map *map);
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void drm_gem_ttm_vunmap(struct drm_gem_object *gem,
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struct dma_buf_map *map);
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int drm_gem_ttm_mmap(struct drm_gem_object *gem,
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struct vm_area_struct *vma);
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#endif
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