[v3,08/11] drm/ttm: add drm_gem_ttm_mmap()

Commit Message

Gerd Hoffmann Sept. 19, 2019, 10:02 a.m. UTC

Add helper function to mmap ttm bo's using &drm_gem_object_funcs.mmap().

Note that with this code path access verification is done by
drm_gem_mmap() (which calls drm_vma_node_is_allowed(()).
The &ttm_bo_driver.verify_access() callback is is not used.

Signed-off-by: Gerd Hoffmann <[e-mail]>
---
 include/drm/drm_gem_ttm_helper.h     |  2 ++
 drivers/gpu/drm/drm_gem_ttm_helper.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

Patch

diff --git a/include/drm/drm_gem_ttm_helper.h b/include/drm/drm_gem_ttm_helper.h
index 6268f89c5a48..118cef76f84f 100644
--- a/include/drm/drm_gem_ttm_helper.h
+++ b/include/drm/drm_gem_ttm_helper.h
@@ -15,5 +15,7 @@ 
 
 void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
 			    const struct drm_gem_object *gem);
+int drm_gem_ttm_mmap(struct drm_gem_object *gem,
+		     struct vm_area_struct *vma);
 
 #endif
diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c
index 9a4bafcf20df..990cd286d1bc 100644
--- a/drivers/gpu/drm/drm_gem_ttm_helper.c
+++ b/drivers/gpu/drm/drm_gem_ttm_helper.c
@@ -52,5 +52,22 @@  void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
 }
 EXPORT_SYMBOL(drm_gem_ttm_print_info);
 
+/**
+ * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
+ * @gem: GEM object.
+ * @vma: vm area.
+ *
+ * This function can be used as &drm_gem_object_funcs.mmap
+ * callback.
+ */
+int drm_gem_ttm_mmap(struct drm_gem_object *gem,
+		     struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
+
+	return ttm_bo_mmap_obj(vma, bo);
+}
+EXPORT_SYMBOL(drm_gem_ttm_mmap);
+
 MODULE_DESCRIPTION("DRM gem ttm helpers");
 MODULE_LICENSE("GPL");