Kernel bump from 4.1.3-rt to 4.1.7-rt.

[kvmfornfv.git] / kernel / include / uapi / drm / i915_drm.h

diff --git a/kernel/include/uapi/drm/i915_drm.h b/kernel/include/uapi/drm/i915_drm.h
index 551b673..a7e41fb 100644 (file)
--- a/kernel/include/uapi/drm/i915_drm.h
+++ b/kernel/include/uapi/drm/i915_drm.h
@@ -1065,6 +1065,14 @@ struct drm_i915_reg_read {
        __u64 offset;
        __u64 val; /* Return value */
 };
+/* Known registers:
+ *
+ * Render engine timestamp - 0x2358 + 64bit - gen7+
+ * - Note this register returns an invalid value if using the default
+ *   single instruction 8byte read, in order to workaround that use
+ *   offset (0x2538 | 1) instead.
+ *
+ */
 
 struct drm_i915_reset_stats {
        __u32 ctx_id;