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 <[email protected]>
Signed-off-by: Noralf Trønnes <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Acked-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index ba6c7e0..6a4fe02 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -652,6 +652,43 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
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
