drm/prime: Add drm_gem_prime_mmap() (7698799f) · Commits · 戴 / test

drivers/gpu/drm/drm_prime.c

+37 −0

Original line number	Diff line number	Diff line
		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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);