diff options
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce.c | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 6773610061d8..5031814ac943 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -36,6 +36,7 @@ #include <asm/mce.h> #include <asm/msr.h> +#include "mce-internal.h" #include "mce.h" /* Handle unconfigured int18 (should never happen) */ @@ -191,7 +192,7 @@ static void print_mce(struct mce *m) "and contact your hardware vendor\n"); } -static void mce_panic(char *msg, struct mce *final) +static void mce_panic(char *msg, struct mce *final, char *exp) { int i; @@ -214,6 +215,8 @@ static void mce_panic(char *msg, struct mce *final) } if (final) print_mce(final); + if (exp) + printk(KERN_EMERG "Machine check: %s\n", exp); panic(msg); } @@ -358,6 +361,22 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b) EXPORT_SYMBOL_GPL(machine_check_poll); /* + * Do a quick check if any of the events requires a panic. + * This decides if we keep the events around or clear them. + */ +static int mce_no_way_out(struct mce *m, char **msg) +{ + int i; + + for (i = 0; i < banks; i++) { + m->status = mce_rdmsrl(MSR_IA32_MC0_STATUS + i*4); + if (mce_severity(m, tolerant, msg) >= MCE_PANIC_SEVERITY) + return 1; + } + return 0; +} + +/* * The actual machine check handler. This only handles real * exceptions when something got corrupted coming in through int 18. * @@ -381,6 +400,7 @@ void do_machine_check(struct pt_regs *regs, long error_code) */ int kill_it = 0; DECLARE_BITMAP(toclear, MAX_NR_BANKS); + char *msg = "Unknown"; atomic_inc(&mce_entry); @@ -395,10 +415,7 @@ void do_machine_check(struct pt_regs *regs, long error_code) mce_setup(&m); m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS); - - /* if the restart IP is not valid, we're done for */ - if (!(m.mcgstatus & MCG_STATUS_RIPV)) - no_way_out = 1; + no_way_out = mce_no_way_out(&m, &msg); barrier(); @@ -430,18 +447,13 @@ void do_machine_check(struct pt_regs *regs, long error_code) __set_bit(i, toclear); if (m.status & MCI_STATUS_EN) { - /* if PCC was set, there's no way out */ - no_way_out |= !!(m.status & MCI_STATUS_PCC); /* * If this error was uncorrectable and there was * an overflow, we're in trouble. If no overflow, * we might get away with just killing a task. */ - if (m.status & MCI_STATUS_UC) { - if (tolerant < 1 || m.status & MCI_STATUS_OVER) - no_way_out = 1; + if (m.status & MCI_STATUS_UC) kill_it = 1; - } } else { /* * Machine check event was not enabled. Clear, but @@ -483,7 +495,7 @@ void do_machine_check(struct pt_regs *regs, long error_code) * has not set tolerant to an insane level, give up and die. */ if (no_way_out && tolerant < 3) - mce_panic("Machine check", &panicm); + mce_panic("Machine check", &panicm, msg); /* * If the error seems to be unrecoverable, something should be @@ -511,7 +523,7 @@ void do_machine_check(struct pt_regs *regs, long error_code) if (user_space) { force_sig(SIGBUS, current); } else if (panic_on_oops || tolerant < 2) { - mce_panic("Uncorrected machine check", &panicm); + mce_panic("Uncorrected machine check", &panicm, msg); } } |