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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
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/module.h>
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#include <drm/drm_gem_ttm_helper.h>
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/**
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* DOC: overview
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*
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* This library provides helper functions for gem objects backed by
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* ttm.
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*/
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/**
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* drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
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* @p: DRM printer
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* @indent: Tab indentation level
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* @gem: GEM object
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*
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* This function can be used as &drm_gem_object_funcs.print_info
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* callback.
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*/
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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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{
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static const char * const plname[] = {
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[ TTM_PL_SYSTEM ] = "system",
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[ TTM_PL_TT ] = "tt",
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[ TTM_PL_VRAM ] = "vram",
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[ TTM_PL_PRIV ] = "priv",
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[ 16 ] = "cached",
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[ 17 ] = "uncached",
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[ 18 ] = "wc",
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[ 19 ] = "contig",
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[ 21 ] = "pinned", /* NO_EVICT */
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[ 22 ] = "topdown",
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};
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const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
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drm_printf_indent(p, indent, "placement=");
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drm_print_bits(p, bo->mem.placement, plname, ARRAY_SIZE(plname));
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drm_printf(p, "\n");
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if (bo->mem.bus.is_iomem)
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drm_printf_indent(p, indent, "bus.offset=%lx\n",
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(unsigned long)bo->mem.bus.offset);
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}
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EXPORT_SYMBOL(drm_gem_ttm_print_info);
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/**
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* drm_gem_ttm_vmap() - vmap &ttm_buffer_object
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* @gem: GEM object.
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* @map: [out] returns the dma-buf mapping.
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*
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* Maps a GEM object with ttm_bo_vmap(). This function can be used as
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* &drm_gem_object_funcs.vmap callback.
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*
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* Returns:
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* 0 on success, or a negative errno code otherwise.
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*/
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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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{
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struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
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return ttm_bo_vmap(bo, map);
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}
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EXPORT_SYMBOL(drm_gem_ttm_vmap);
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/**
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* drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object
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* @gem: GEM object.
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* @map: dma-buf mapping.
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*
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* Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as
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* &drm_gem_object_funcs.vmap callback.
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*/
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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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{
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struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
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ttm_bo_vunmap(bo, map);
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}
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EXPORT_SYMBOL(drm_gem_ttm_vunmap);
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/**
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* drm_gem_ttm_mmap() - mmap &ttm_buffer_object
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* @gem: GEM object.
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* @vma: vm area.
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*
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* This function can be used as &drm_gem_object_funcs.mmap
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* callback.
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*/
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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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{
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struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
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int ret;
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ret = ttm_bo_mmap_obj(vma, bo);
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if (ret < 0)
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return ret;
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/*
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* ttm has its own object refcounting, so drop gem reference
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* to avoid double accounting counting.
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*/
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drm_gem_object_put(gem);
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_ttm_mmap);
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MODULE_DESCRIPTION("DRM gem ttm helpers");
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MODULE_LICENSE("GPL");
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