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

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
Noralf Trønnes
1 parent f001488112
Showing 2 changed files with 38 additions and 0 deletions Side-by-side Diff
drivers/gpu/drm/drm_prime.c
include/drm/drm_prime.h
@@ -652,6 +652,43 @@
 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
  * @dma_buf: dma-buf object to import
@@ -70,6 +70,7 @@
 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);
...	...	@@ -652,6 +652,43 @@
652	652	EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
653	653
654	654	/**
	655	+ * drm_gem_prime_mmap - PRIME mmap function for GEM drivers
	656	+ * @obj: GEM object
	657	+ * @vma: Virtual address range
	658	+ *
	659	+ * This function sets up a userspace mapping for PRIME exported buffers using
	660	+ * the same codepath that is used for regular GEM buffer mapping on the DRM fd.
	661	+ * The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is
	662	+ * called to set up the mapping.
	663	+ *
	664	+ * Drivers can use this as their &drm_driver.gem_prime_mmap callback.
	665	+ */
	666	+int drm_gem_prime_mmap(struct drm_gem_object obj, struct vm_area_struct vma)
	667	+{
	668	+ /* Used by drm_gem_mmap() to lookup the GEM object */
	669	+ struct drm_file priv = {
	670	+ .minor = obj->dev->primary,
	671	+ };
	672	+ struct file fil = {
	673	+ .private_data = &priv,
	674	+ };
	675	+ int ret;
	676	+
	677	+ ret = drm_vma_node_allow(&obj->vma_node, &priv);
	678	+ if (ret)
	679	+ return ret;
	680	+
	681	+ vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
	682	+
	683	+ ret = obj->dev->driver->fops->mmap(&fil, vma);
	684	+
	685	+ drm_vma_node_revoke(&obj->vma_node, &priv);
	686	+
	687	+ return ret;
	688	+}
	689	+EXPORT_SYMBOL(drm_gem_prime_mmap);
	690	+
	691	+/**
655	692	* drm_gem_prime_import_dev - core implementation of the import callback
656	693	* @dev: drm_device to import into
657	694	* @dma_buf: dma-buf object to import
...	...	@@ -70,6 +70,7 @@
70	70	int drm_gem_prime_handle_to_fd(struct drm_device *dev,
71	71	struct drm_file *file_priv, uint32_t handle, uint32_t flags,
72	72	int *prime_fd);
	73	+int drm_gem_prime_mmap(struct drm_gem_object obj, struct vm_area_struct vma);
73	74	struct drm_gem_object drm_gem_prime_import(struct drm_device dev,
74	75	struct dma_buf *dma_buf);
75	76