159 lines
3.9 KiB
C
159 lines
3.9 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->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 iosys_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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int ret;
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dma_resv_lock(gem->resv, NULL);
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ret = ttm_bo_vmap(bo, map);
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dma_resv_unlock(gem->resv);
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return ret;
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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 iosys_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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dma_resv_lock(gem->resv, NULL);
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ttm_bo_vunmap(bo, map);
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dma_resv_unlock(gem->resv);
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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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