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151 lines
3.7 KiB
151 lines
3.7 KiB
// 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->resource->placement, plname, ARRAY_SIZE(plname)); |
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drm_printf(p, "\n"); |
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if (bo->resource->bus.is_iomem) |
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drm_printf_indent(p, indent, "bus.offset=%lx\n", |
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(unsigned long)bo->resource->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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/** |
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* drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset |
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* @file: DRM file pointer. |
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* @dev: DRM device. |
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* @handle: GEM handle |
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* @offset: Returns the mapping's memory offset on success |
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* |
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* Provides an implementation of struct &drm_driver.dumb_map_offset for |
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* TTM-based GEM drivers. TTM allocates the offset internally and |
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* drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations. |
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* |
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* See struct &drm_driver.dumb_map_offset. |
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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_dumb_map_offset(struct drm_file *file, struct drm_device *dev, |
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uint32_t handle, uint64_t *offset) |
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{ |
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struct drm_gem_object *gem; |
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gem = drm_gem_object_lookup(file, handle); |
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if (!gem) |
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return -ENOENT; |
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*offset = drm_vma_node_offset_addr(&gem->vma_node); |
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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_dumb_map_offset); |
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MODULE_DESCRIPTION("DRM gem ttm helpers"); |
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MODULE_LICENSE("GPL");
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