| // SPDX-License-Identifier: GPL-2.0-or-later |
| |
| #include <linux/module.h> |
| |
| #include <drm/drm_gem_ttm_helper.h> |
| |
| /** |
| * DOC: overview |
| * |
| * This library provides helper functions for gem objects backed by |
| * ttm. |
| */ |
| |
| /** |
| * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs |
| * @p: DRM printer |
| * @indent: Tab indentation level |
| * @gem: GEM object |
| * |
| * This function can be used as &drm_gem_object_funcs.print_info |
| * callback. |
| */ |
| void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent, |
| const struct drm_gem_object *gem) |
| { |
| static const char * const plname[] = { |
| [ TTM_PL_SYSTEM ] = "system", |
| [ TTM_PL_TT ] = "tt", |
| [ TTM_PL_VRAM ] = "vram", |
| [ TTM_PL_PRIV ] = "priv", |
| |
| [ 16 ] = "cached", |
| [ 17 ] = "uncached", |
| [ 18 ] = "wc", |
| [ 19 ] = "contig", |
| |
| [ 21 ] = "pinned", /* NO_EVICT */ |
| [ 22 ] = "topdown", |
| }; |
| const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); |
| |
| drm_printf_indent(p, indent, "placement="); |
| drm_print_bits(p, bo->mem.placement, plname, ARRAY_SIZE(plname)); |
| drm_printf(p, "\n"); |
| |
| if (bo->mem.bus.is_iomem) |
| drm_printf_indent(p, indent, "bus.offset=%lx\n", |
| (unsigned long)bo->mem.bus.offset); |
| } |
| EXPORT_SYMBOL(drm_gem_ttm_print_info); |
| |
| /** |
| * drm_gem_ttm_vmap() - vmap &ttm_buffer_object |
| * @gem: GEM object. |
| * @map: [out] returns the dma-buf mapping. |
| * |
| * Maps a GEM object with ttm_bo_vmap(). This function can be used as |
| * &drm_gem_object_funcs.vmap callback. |
| * |
| * Returns: |
| * 0 on success, or a negative errno code otherwise. |
| */ |
| int drm_gem_ttm_vmap(struct drm_gem_object *gem, |
| struct dma_buf_map *map) |
| { |
| struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); |
| |
| return ttm_bo_vmap(bo, map); |
| } |
| EXPORT_SYMBOL(drm_gem_ttm_vmap); |
| |
| /** |
| * drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object |
| * @gem: GEM object. |
| * @map: dma-buf mapping. |
| * |
| * Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as |
| * &drm_gem_object_funcs.vmap callback. |
| */ |
| void drm_gem_ttm_vunmap(struct drm_gem_object *gem, |
| struct dma_buf_map *map) |
| { |
| struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); |
| |
| ttm_bo_vunmap(bo, map); |
| } |
| EXPORT_SYMBOL(drm_gem_ttm_vunmap); |
| |
| /** |
| * drm_gem_ttm_mmap() - mmap &ttm_buffer_object |
| * @gem: GEM object. |
| * @vma: vm area. |
| * |
| * This function can be used as &drm_gem_object_funcs.mmap |
| * callback. |
| */ |
| int drm_gem_ttm_mmap(struct drm_gem_object *gem, |
| struct vm_area_struct *vma) |
| { |
| struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); |
| int ret; |
| |
| ret = ttm_bo_mmap_obj(vma, bo); |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * ttm has its own object refcounting, so drop gem reference |
| * to avoid double accounting counting. |
| */ |
| drm_gem_object_put(gem); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_gem_ttm_mmap); |
| |
| /** |
| * drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset |
| * @file: DRM file pointer. |
| * @dev: DRM device. |
| * @handle: GEM handle |
| * @offset: Returns the mapping's memory offset on success |
| * |
| * Provides an implementation of struct &drm_driver.dumb_map_offset for |
| * TTM-based GEM drivers. TTM allocates the offset internally and |
| * drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations. |
| * |
| * See struct &drm_driver.dumb_map_offset. |
| * |
| * Returns: |
| * 0 on success, or a negative errno code otherwise. |
| */ |
| int drm_gem_ttm_dumb_map_offset(struct drm_file *file, struct drm_device *dev, |
| uint32_t handle, uint64_t *offset) |
| { |
| struct drm_gem_object *gem; |
| |
| gem = drm_gem_object_lookup(file, handle); |
| if (!gem) |
| return -ENOENT; |
| |
| *offset = drm_vma_node_offset_addr(&gem->vma_node); |
| |
| drm_gem_object_put(gem); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_gem_ttm_dumb_map_offset); |
| |
| MODULE_DESCRIPTION("DRM gem ttm helpers"); |
| MODULE_LICENSE("GPL"); |