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// 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->resource->placement, plname, ARRAY_SIZE(plname));
drm_printf(p, "\n");
if (bo->resource->bus.is_iomem)
drm_printf_indent(p, indent, "bus.offset=%lx\n",
(unsigned long)bo->resource->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 iosys_map *map)
{
struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
int ret;
dma_resv_lock(gem->resv, NULL);
ret = ttm_bo_vmap(bo, map);
dma_resv_unlock(gem->resv);
return ret;
}
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 iosys_map *map)
{
struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
dma_resv_lock(gem->resv, NULL);
ttm_bo_vunmap(bo, map);
dma_resv_unlock(gem->resv);
}
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");
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