drm: Add ratelimited versions of the DRM_DEBUG* macros
There's a couple of places where this would be useful for drivers (such
as reporting DP aux transaction timeouts).
Signed-off-by: Lyude <cpaul@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1470443443-27252-7-git-send-email-cpaul@redhat.com
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 856c174..f8e87fd 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -232,6 +232,36 @@
drm_ut_debug_printk(__func__, fmt, ##args); \
} while (0)
+#define _DRM_DEFINE_DEBUG_RATELIMITED(level, fmt, args...) \
+ do { \
+ if (unlikely(drm_debug & DRM_UT_ ## level)) { \
+ static DEFINE_RATELIMIT_STATE( \
+ _rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ \
+ if (__ratelimit(&_rs)) { \
+ drm_ut_debug_printk(__func__, fmt, \
+ ##args); \
+ } \
+ } \
+ } while (0)
+
+/**
+ * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
+ *
+ * \param fmt printf() like format string.
+ * \param arg arguments
+ */
+#define DRM_DEBUG_RATELIMITED(fmt, args...) \
+ _DRM_DEFINE_DEBUG_RATELIMITED(CORE, fmt, ##args)
+#define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...) \
+ _DRM_DEFINE_DEBUG_RATELIMITED(DRIVER, fmt, ##args)
+#define DRM_DEBUG_KMS_RATELIMITED(fmt, args...) \
+ _DRM_DEFINE_DEBUG_RATELIMITED(KMS, fmt, ##args)
+#define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...) \
+ _DRM_DEFINE_DEBUG_RATELIMITED(PRIME, fmt, ##args)
+
/*@}*/
/***********************************************************************/