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drm/prime: Add drm_gem_prime_mmap() 

Add a generic PRIME GEM mmap function.

v2: Fix link in docs (Daniel Vetter)

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181110145647.17580-3-noralf@tronnes.org
hifive-unleashed-5.1
Noralf Trønnes 2018-11-10 15:56:44 +01:00
parent f001488112
commit 7698799f95
2 changed files with 38 additions and 0 deletions
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37
drivers/gpu/drm/drm_prime.c
View File

@ -651,6 +651,43 @@ out_unlock:
}
EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
/**
* drm_gem_prime_mmap - PRIME mmap function for GEM drivers
* @obj: GEM object
* @vma: Virtual address range
*
* This function sets up a userspace mapping for PRIME exported buffers using
* the same codepath that is used for regular GEM buffer mapping on the DRM fd.
* The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is
* called to set up the mapping.
*
* Drivers can use this as their &drm_driver.gem_prime_mmap callback.
*/
int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
/* Used by drm_gem_mmap() to lookup the GEM object */
struct drm_file priv = {
.minor = obj->dev->primary,
};
struct file fil = {
.private_data = &priv,
};
int ret;
ret = drm_vma_node_allow(&obj->vma_node, &priv);
if (ret)
return ret;
vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
ret = obj->dev->driver->fops->mmap(&fil, vma);
drm_vma_node_revoke(&obj->vma_node, &priv);
return ret;
}
EXPORT_SYMBOL(drm_gem_prime_mmap);
/**
* drm_gem_prime_import_dev - core implementation of the import callback
* @dev: drm_device to import into

1
include/drm/drm_prime.h
View File

@ -70,6 +70,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
struct drm_file *file_priv, uint32_t handle, uint32_t flags,
int *prime_fd);
int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);