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x86/mce/dev-mcelog: Dynamically allocate space for machine check records

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We have had a hard coded limit of 32 machine check records since the
dawn of time.  But as numbers of cores increase, it is possible for
more than 32 errors to be reported before a user process reads from
/dev/mcelog. In this case the additional errors are lost.

Keep 32 as the minimum. But tune the maximum value up based on the
number of processors.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200218184408.GA23048@agluck-desk2.amr.corp.intel.com
This commit is contained in:
Tony Luck
2020-02-18 10:44:08 -08:00
committed by Borislav Petkov
parent 2976908e41
commit d8ecca4043
2 changed files with 30 additions and 23 deletions
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6
arch/x86/include/asm/mce.h
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@@ -102,7 +102,7 @@
#define MCE_OVERFLOW 0 /* bit 0 in flags means overflow */
#define MCE_LOG_LEN 32
#define MCE_LOG_MIN_LEN 32U
#define MCE_LOG_SIGNATURE "MACHINECHECK"
/* AMD Scalable MCA */
@@ -135,11 +135,11 @@
*/
struct mce_log_buffer {
char signature[12]; /* "MACHINECHECK" */
unsigned len; /* = MCE_LOG_LEN */
unsigned len; /* = elements in .mce_entry[] */
unsigned next;
unsigned flags;
unsigned recordlen; /* length of struct mce */
struct mce entry[MCE_LOG_LEN];
struct mce entry[];
};
enum mce_notifier_prios {