From 231927d939f073ffee24a5e7acb5b5621ba8b7c8 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 16 Oct 2019 13:52:00 +0200
Subject: drm/ttm: add drm_gem_ttm_mmap()
Git-commit: 231927d939f073ffee24a5e7acb5b5621ba8b7c8
Patch-mainline: v5.5-rc1
References: bsc#1152472
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.
v3: use ttm_bo_mmap_obj instead of ttm_bo_mmap_vma_setup
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20191016115203.20095-9-kraxel@redhat.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/drm_gem_ttm_helper.c | 17 +++++++++++++++++
include/drm/drm_gem_ttm_helper.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c
index a534104d8bee..7412bfc5c05a 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");
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
--
2.28.0