mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
79e2cf2e7a
The new common dma-buf locking convention will require buffer importers to hold the reservation lock around mapping operations. Make DRM GEM core to take the lock around the vmapping operations and update DRM drivers to use the locked functions for the case where DRM core now holds the lock. This patch prepares DRM core and drivers to the common dynamic dma-buf locking convention. Acked-by: Christian König <christian.koenig@amd.com> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221017172229.42269-4-dmitry.osipenko@collabora.com
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
// 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);
|
|
|
|
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 iosys_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");
|