[PATCH v9 7/7] drm: Introduce DRM_CAP_ATOMIC_ERROR_REPORTING

[Arun R Murthy <arun.r.murthy@intel.com>]

The new capability informs users that atomic_ioctl() supports
failure reporting when an error occurs.

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 drivers/gpu/drm/drm_ioctl.c | 3 +++
 include/uapi/drm/drm.h      | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index ff193155129e7e863888d8958458978566b144f8..59f2b5b53830fd3aadc6e18cf49f0660a99e9c96 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -304,6 +304,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
 		req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) &&
 			     dev->mode_config.async_page_flip;
 		break;
+	case DRM_CAP_ATOMIC_ERROR_REPORTING:
+		req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) && 1;
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 27cc159c1d275c7a7fe057840ef792f30a582bb7..6082410bcabfb4aa37b85e5f03d3611e5aed4aa5 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -812,6 +812,13 @@ struct drm_gem_change_handle {
  * commits.
  */
 #define DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP	0x15
+/**
+ * DRM_CAP_ATOMIC_ERROR_REPORTING
+ *
+ * If set to 1, the driver supports reporting of failure codes on error in
+ * atomic ioctl().
+ */
+#define DRM_CAP_ATOMIC_ERROR_REPORTING	0x16
 
 /* DRM_IOCTL_GET_CAP ioctl argument type */
 struct drm_get_cap {

-- 
2.25.1