drm/prime: expose capability flags for userspace.

This lets the kernel tell userspace if the device supports prime import/export. This is useful for -modesetting at least, but would be nice for other drivers. Reviewed-by: Chris Wilson <[email protected]> Signed-off-by: Dave Airlie <[email protected]>
goeke · May 18, 2012 · 4271a40 · 4271a40
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commit 4271a40
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diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
@@ -283,6 +283,10 @@ int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 	case DRM_CAP_DUMB_PREFER_SHADOW:
 		req->value = dev->mode_config.prefer_shadow;
 		break;
+	case DRM_CAP_PRIME:
+		req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
+		req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
+		break;
 	default:
 		return -EINVAL;
 	}

diff --git a/include/drm/drm.h b/include/drm/drm.h
@@ -777,6 +777,10 @@ struct drm_event_vblank {
 #define DRM_CAP_VBLANK_HIGH_CRTC 0x2
 #define DRM_CAP_DUMB_PREFERRED_DEPTH 0x3
 #define DRM_CAP_DUMB_PREFER_SHADOW 0x4
+#define DRM_CAP_PRIME 0x5
+
+#define DRM_PRIME_CAP_IMPORT 0x1
+#define DRM_PRIME_CAP_EXPORT 0x2
 
 /* typedef area */
 #ifndef __KERNEL__