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authorRob Clark <robdclark@gmail.com>2013-11-21 14:29:51 -0500
committerDave Airlie <airlied@redhat.com>2013-12-18 10:43:49 +1000
commit5d13d425eb58d28c8be6dc8bf706ca361373c3ba (patch)
tree409cba74ae5a5b67e807fe1f163e50f6a27b0d61 /include/drm
parentce456e039613b384234de4d1faf0332b513cc1e4 (diff)
downloadlinux-linaro-stable-5d13d425eb58d28c8be6dc8bf706ca361373c3ba.tar.gz
drm: add DRM_ERROR_RATELIMITED
For error traces in situations that can run away, it is nice to have a rate-limited version of DRM_ERROR() to avoid massive log flooding. Signed-off-by: Rob Clark <robdclark@gmail.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drmP.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 1d4a920ef7ff..bc07c7af0f6e 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -56,6 +56,7 @@
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/ratelimit.h>
#if defined(__alpha__) || defined(__powerpc__)
#include <asm/pgtable.h> /* For pte_wrprotect */
#endif
@@ -180,6 +181,22 @@ int drm_err(const char *func, const char *format, ...);
#define DRM_ERROR(fmt, ...) \
drm_err(__func__, fmt, ##__VA_ARGS__)
+/**
+ * Rate limited error output. Like DRM_ERROR() but won't flood the log.
+ *
+ * \param fmt printf() like format string.
+ * \param arg arguments
+ */
+#define DRM_ERROR_RATELIMITED(fmt, ...) \
+({ \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ \
+ if (__ratelimit(&_rs)) \
+ drm_err(__func__, fmt, ##__VA_ARGS__); \
+})
+
#define DRM_INFO(fmt, ...) \
printk(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)