[PATCH v4 05/17] drm: add mmap() to drm_gem_object_funcs

[Gerd Hoffmann <kraxel@redhat.com>]

drm_gem_object_funcs->vm_ops alone can't handle
everything mmap() needs.  Add a new callback for it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/drm/drm_gem.h     | 9 +++++++++
 drivers/gpu/drm/drm_gem.c | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index ae693c0666cd..ee3c4ad742c6 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -150,6 +150,15 @@ struct drm_gem_object_funcs {
 	 */
 	void (*vunmap)(struct drm_gem_object *obj, void *vaddr);
 
+	/**
+	 * @mmap:
+	 *
+	 * Called by drm_gem_mmap() for additional checks/setup.
+	 *
+	 * This callback is optional.
+	 */
+	int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
+
 	/**
 	 * @vm_ops:
 	 *
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index afc38cece3f5..84db8de217e1 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1105,6 +1105,8 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
 		vma->vm_ops = obj->funcs->vm_ops;
 	else if (dev->driver->gem_vm_ops)
 		vma->vm_ops = dev->driver->gem_vm_ops;
+	else if (obj->funcs && obj->funcs->mmap)
+		/* obj->funcs->mmap must set vma->vm_ops */;
 	else
 		return -EINVAL;
 
@@ -1192,6 +1194,10 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT,
 			       vma);
 
+	if (ret == 0)
+		if (obj->funcs->mmap)
+			ret = obj->funcs->mmap(obj, vma);
+
 	drm_gem_object_put_unlocked(obj);
 
 	return ret;
-- 
2.18.1