drm: add mmap() to drm_gem_object_funcs

drm_gem_object_funcs->vm_ops alone can't handle everything which needs
to be done for mmap(), tweaking vm_flags for example.  So add a new
mmap() callback to drm_gem_object_funcs where this code can go to.

Note that the vm_ops field is not used in case the mmap callback is
present, it is expected that the callback sets vma->vm_ops instead.

Also setting vm_flags and vm_page_prot is the job of the new callback.
so drivers have more control over these flags.

drm_gem_mmap_obj() will use the new callback for object specific mmap
setup.  With this in place the need for driver-speific fops->mmap
callbacks goes away, drm_gem_mmap can be hooked instead.

drm_gem_prime_mmap() will use the new callback too to just mmap gem
objects directly instead of jumping though loops to make
drm_gem_object_lookup() and fops->mmap work.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20191016115203.20095-2-kraxel@redhat.com

1 files changed, 14 insertions, 0 deletions

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 6aaba14f5972..e71f75a2ab57 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -151,6 +151,20 @@ struct drm_gem_object_funcs {
 	void (*vunmap)(struct drm_gem_object *obj, void *vaddr);
 
 	/**
+	 * @mmap:
+	 *
+	 * Handle mmap() of the gem object, setup vma accordingly.
+	 *
+	 * This callback is optional.
+	 *
+	 * The callback is used by by both drm_gem_mmap_obj() and
+	 * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not
+	 * used, the @mmap callback must set vma->vm_ops instead.
+	 *
+	 */
+	int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
+
+	/**
 	 * @vm_ops:
 	 *
 	 * Virtual memory operations used with mmap.