drm: add cap bit to denote if dumb ioctl is available or not.

This allows libkms to make an easier decision.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index d6de9d0..7f6912a 100644 (file)
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -275,6 +275,14 @@ int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
        struct drm_get_cap *req = data;
 
        req->value = 0;
+       switch (req->capability) {
+       case DRM_CAP_DUMB_BUFFER:
+               if (dev->driver->dumb_create)
+                       req->value = 1;
+               break;
+       default:
+               return -EINVAL;
+       }
        return 0;
 }
 

diff --git a/include/drm/drm.h b/include/drm/drm.h
index da4efd1..9ac4313 100644 (file)
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -752,6 +752,8 @@ struct drm_event_vblank {
        __u32 reserved;
 };
 
+#define DRM_CAP_DUMB_BUFFER 0x1
+
 /* typedef area */
 #ifndef __KERNEL__
 typedef struct drm_clip_rect drm_clip_rect_t;