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RAS: Add a Corrected Errors Collector

Browse source 
Introduce a simple data structure for collecting correctable errors
along with accessors. More detailed description in the code itself.

The error decoding is done with the decoding chain now and
mce_first_notifier() gets to see the error first and the CEC decides
whether to log it and then the rest of the chain doesn't hear about it -
basically the main reason for the CE collector - or to continue running
the notifiers.

When the CEC hits the action threshold, it will try to soft-offine the
page containing the ECC and then the whole decoding chain gets to see
the error.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170327093304.10683-5-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2017-03-27 11:33:02 +02:00 • committed by Ingo Molnar
parent e64edfcce9
commit 011d826111
10 changed files with 706 additions and 83 deletions
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13
include/linux/ras.h
View file

@ -1,14 +1,25 @@
#ifndef __RAS_H__
#define __RAS_H__
#include <asm/errno.h>
#ifdef CONFIG_DEBUG_FS
int ras_userspace_consumers(void);
void ras_debugfs_init(void);
int ras_add_daemon_trace(void);
#else
static inline int ras_userspace_consumers(void) { return 0; }
static inline void ras_debugfs_init(void) { return; }
static inline void ras_debugfs_init(void) { }
static inline int ras_add_daemon_trace(void) { return 0; }
#endif
#ifdef CONFIG_RAS_CEC
void __init cec_init(void);
int __init parse_cec_param(char *str);
int cec_add_elem(u64 pfn);
#else
static inline void __init cec_init(void) { }
static inline int cec_add_elem(u64 pfn) { return -ENODEV; }
#endif
#endif /* __RAS_H__ */