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x86, mce, severity: Extend the the mce_severity mechanism to handle UCNA/DEFERRED error 

Until now, the mce_severity mechanism can only identify the severity
of UCNA error as MCE_KEEP_SEVERITY. Meanwhile, it is not able to filter
out DEFERRED error for AMD platform.

This patch extends the mce_severity mechanism for handling
UCNA/DEFERRED error. In order to do this, the patch introduces a new
severity level - MCE_UCNA/DEFERRED_SEVERITY.

In addition, mce_severity is specific to machine check exception,
and it will check MCIP/EIPV/RIPV bits. In order to use mce_severity
mechanism in non-exception context, the patch also introduces a new
argument (is_excp) for mce_severity. `is_excp' is used to explicitly
specify the calling context of mce_severity.

Reviewed-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Signed-off-by: Chen Yucong <slaoub@gmail.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Chen Yucong 2014-11-18 10:09:19 +08:00 committed by Tony Luck
parent 8dcf32ea22
commit e3480271f5
5 changed files with 32 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/mce.h
View File

@ -34,6 +34,10 @@
#define MCI_STATUS_S (1ULL<<56) /* Signaled machine check */
#define MCI_STATUS_AR (1ULL<<55) /* Action required */
/* AMD-specific bits */
#define MCI_STATUS_DEFERRED (1ULL<<44) /* declare an uncorrected error */
#define MCI_STATUS_POISON (1ULL<<43) /* access poisonous data */
/*
* Note that the full MCACOD field of IA32_MCi_STATUS MSR is
* bits 15:0. But bit 12 is the 'F' bit, defined for corrected

4
arch/x86/kernel/cpu/mcheck/mce-internal.h
View File

@ -3,6 +3,8 @@
enum severity_level {
MCE_NO_SEVERITY,
MCE_DEFERRED_SEVERITY,
MCE_UCNA_SEVERITY = MCE_DEFERRED_SEVERITY,
MCE_KEEP_SEVERITY,
MCE_SOME_SEVERITY,
MCE_AO_SEVERITY,
@ -21,7 +23,7 @@ struct mce_bank {
char attrname[ATTR_LEN]; /* attribute name */
};
int mce_severity(struct mce *a, int tolerant, char **msg);
int mce_severity(struct mce *a, int tolerant, char **msg, bool is_excp);
struct dentry *mce_get_debugfs_dir(void);
extern struct mce_bank *mce_banks;

23
arch/x86/kernel/cpu/mcheck/mce-severity.c
View File

@ -31,6 +31,7 @@
enum context { IN_KERNEL = 1, IN_USER = 2 };
enum ser { SER_REQUIRED = 1, NO_SER = 2 };
enum exception { EXCP_CONTEXT = 1, NO_EXCP = 2 };
static struct severity {
u64 mask;
@ -40,6 +41,7 @@ static struct severity {
unsigned char mcgres;
unsigned char ser;
unsigned char context;
unsigned char excp;
unsigned char covered;
char *msg;
} severities[] = {
@ -48,6 +50,8 @@ static struct severity {
#define USER .context = IN_USER
#define SER .ser = SER_REQUIRED
#define NOSER .ser = NO_SER
#define EXCP .excp = EXCP_CONTEXT
#define NOEXCP .excp = NO_EXCP
#define BITCLR(x) .mask = x, .result = 0
#define BITSET(x) .mask = x, .result = x
#define MCGMASK(x, y) .mcgmask = x, .mcgres = y
@ -62,7 +66,7 @@ static struct severity {
),
MCESEV(
NO, "Not enabled",
BITCLR(MCI_STATUS_EN)
EXCP, BITCLR(MCI_STATUS_EN)
),
MCESEV(
PANIC, "Processor context corrupt",
@ -71,16 +75,20 @@ static struct severity {
/* When MCIP is not set something is very confused */
MCESEV(
PANIC, "MCIP not set in MCA handler",
MCGMASK(MCG_STATUS_MCIP, 0)
EXCP, MCGMASK(MCG_STATUS_MCIP, 0)
),
/* Neither return not error IP -- no chance to recover -> PANIC */
MCESEV(
PANIC, "Neither restart nor error IP",
MCGMASK(MCG_STATUS_RIPV|MCG_STATUS_EIPV, 0)
EXCP, MCGMASK(MCG_STATUS_RIPV|MCG_STATUS_EIPV, 0)
),
MCESEV(
PANIC, "In kernel and no restart IP",
KERNEL, MCGMASK(MCG_STATUS_RIPV, 0)
EXCP, KERNEL, MCGMASK(MCG_STATUS_RIPV, 0)
),
MCESEV(
DEFERRED, "Deferred error",
NOSER, MASK(MCI_STATUS_UC|MCI_STATUS_DEFERRED|MCI_STATUS_POISON, MCI_STATUS_DEFERRED)
),
MCESEV(
KEEP, "Corrected error",
@ -89,7 +97,7 @@ static struct severity {
/* ignore OVER for UCNA */
MCESEV(
KEEP, "Uncorrected no action required",
UCNA, "Uncorrected no action required",
SER, MASK(MCI_UC_SAR, MCI_STATUS_UC)
),
MCESEV(
@ -178,8 +186,9 @@ static int error_context(struct mce *m)
return ((m->cs & 3) == 3) ? IN_USER : IN_KERNEL;
}
int mce_severity(struct mce *m, int tolerant, char **msg)
int mce_severity(struct mce *m, int tolerant, char **msg, bool is_excp)
{
enum exception excp = (is_excp ? EXCP_CONTEXT : NO_EXCP);
enum context ctx = error_context(m);
struct severity *s;
@ -194,6 +203,8 @@ int mce_severity(struct mce *m, int tolerant, char **msg)
continue;
if (s->context && ctx != s->context)
continue;
if (s->excp && excp != s->excp)
continue;
if (msg)
*msg = s->msg;
s->covered = 1;

14
arch/x86/kernel/cpu/mcheck/mce.c
View File

@ -668,7 +668,8 @@ static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp,
if (quirk_no_way_out)
quirk_no_way_out(i, m, regs);
}
if (mce_severity(m, mca_cfg.tolerant, msg) >= MCE_PANIC_SEVERITY)
if (mce_severity(m, mca_cfg.tolerant, msg, true) >=
MCE_PANIC_SEVERITY)
ret = 1;
}
return ret;
@ -754,7 +755,7 @@ static void mce_reign(void)
for_each_possible_cpu(cpu) {
int severity = mce_severity(&per_cpu(mces_seen, cpu),
mca_cfg.tolerant,
&nmsg);
&nmsg, true);
if (severity > global_worst) {
msg = nmsg;
global_worst = severity;
@ -1095,13 +1096,14 @@ void do_machine_check(struct pt_regs *regs, long error_code)
*/
add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
severity = mce_severity(&m, cfg->tolerant, NULL);
severity = mce_severity(&m, cfg->tolerant, NULL, true);
/*
* When machine check was for corrected handler don't touch,
* unless we're panicing.
* When machine check was for corrected/deferred handler don't
* touch, unless we're panicing.
*/
if (severity == MCE_KEEP_SEVERITY && !no_way_out)
if ((severity == MCE_KEEP_SEVERITY ||
severity == MCE_UCNA_SEVERITY) && !no_way_out)
continue;
__set_bit(i, toclear);
if (severity == MCE_NO_SEVERITY) {

3
drivers/edac/mce_amd.h
View File

@ -32,9 +32,6 @@
#define R4(x) (((x) >> 4) & 0xf)
#define R4_MSG(x) ((R4(x) < 9) ? rrrr_msgs[R4(x)] : "Wrong R4!")
#define MCI_STATUS_DEFERRED BIT_64(44)
#define MCI_STATUS_POISON BIT_64(43)
extern const char * const pp_msgs[];
enum tt_ids {