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drm: add DRM_ERROR_RATELIMITED

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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>
This commit is contained in:
Rob Clark 2013-11-21 14:29:51 -05:00 committed by Dave Airlie
parent ce456e0396
commit 5d13d425eb
1 changed files with 17 additions and 0 deletions
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17
include/drm/drmP.h
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@ -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__)