Commit-ID: 61b0fccd7f114573f973dfe25d864608822dc09e
Gitweb: http://git.kernel.org/tip/61b0fccd7f114573f973dfe25d864608822dc09e
Author: Tony Luck <tony.luck@xxxxxxxxx>
AuthorDate: Thu, 19 Jul 2012 11:28:46 -0700
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 26 Jul 2012 15:05:47 +0200
x86/mce: Add quirk for instruction recovery on Sandy Bridge processors
Sandy Bridge processors follow the SDM (Vol 3B, Table 15-20) and
set both the RIPV and EIPV bits in the MCG_STATUS register to
zero for machine checks during instruction fetch. This is more
than a little counter-intuitive and means that Linux cannot
recover from these errors. Rather than insert special case code
at several places in mce.c and mce-severity.c, we pretend the
EIPV bit was set for just this case early in processing the
machine check.
Acked-by: Borislav Petkov <bp@xxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Chen Gong <gong.chen@xxxxxxxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/180a06f3f357cf9f78259ae443a082b14a29535b.1343078495.git.tony.luck@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/cpu/mcheck/mce.c | 43 +++++++++++++++++++++++++++++++++++--
1 files changed, 40 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 5a5a5dc..8cf60e2 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -105,6 +105,8 @@ DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = {
static DEFINE_PER_CPU(struct work_struct, mce_work);
+static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs);
+
/*
* CPU/chipset specific EDAC code can register a notifier call here to print
* MCE errors in a human-readable form.
@@ -652,14 +654,18 @@ 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, unsigned long *validp)
+static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp,
+ struct pt_regs *regs)
{
int i, ret = 0;
for (i = 0; i < banks; i++) {
m->status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i));
- if (m->status & MCI_STATUS_VAL)
+ if (m->status & MCI_STATUS_VAL) {
__set_bit(i, validp);
+ if (quirk_no_way_out)
+ quirk_no_way_out(i, m, regs);
+ }
if (mce_severity(m, tolerant, msg) >= MCE_PANIC_SEVERITY)
ret = 1;
}
@@ -1042,7 +1048,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
*final = m;
memset(valid_banks, 0, sizeof(valid_banks));
- no_way_out = mce_no_way_out(&m, &msg, valid_banks);
+ no_way_out = mce_no_way_out(&m, &msg, valid_banks, regs);
barrier();
@@ -1418,6 +1424,34 @@ static void __mcheck_cpu_init_generic(void)
}
}
+/*
+ * During IFU recovery Sandy Bridge -EP4S processors set the RIPV and
+ * EIPV bits in MCG_STATUS to zero on the affected logical processor (SDM
+ * Vol 3B Table 15-20). But this confuses both the code that determines
+ * whether the machine check occurred in kernel or user mode, and also
+ * the severity assessment code. Pretend that EIPV was set, and take the
+ * ip/cs values from the pt_regs that mce_gather_info() ignored earlier.
+ */
+static void quirk_sandybridge_ifu(int bank, struct mce *m, struct pt_regs *regs)
+{
+ if (bank != 0)
+ return;
+ if ((m->mcgstatus & (MCG_STATUS_EIPV|MCG_STATUS_RIPV)) != 0)
+ return;
+ if ((m->status & (MCI_STATUS_OVER|MCI_STATUS_UC|
+ MCI_STATUS_EN|MCI_STATUS_MISCV|MCI_STATUS_ADDRV|
+ MCI_STATUS_PCC|MCI_STATUS_S|MCI_STATUS_AR|
+ MCACOD)) !=
+ (MCI_STATUS_UC|MCI_STATUS_EN|
+ MCI_STATUS_MISCV|MCI_STATUS_ADDRV|MCI_STATUS_S|
+ MCI_STATUS_AR|MCACOD_INSTR))
+ return;
+
+ m->mcgstatus |= MCG_STATUS_EIPV;
+ m->ip = regs->ip;
+ m->cs = regs->cs;
+}
+
/* Add per CPU specific workarounds here */
static int __cpuinit __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
{
@@ -1515,6 +1549,9 @@ static int __cpuinit __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
*/
if (c->x86 == 6 && c->x86_model <= 13 && mce_bootlog < 0)
mce_bootlog = 0;
+
+ if (c->x86 == 6 && c->x86_model == 45)
+ quirk_no_way_out = quirk_sandybridge_ifu;
}
if (monarch_timeout < 0)
monarch_timeout = 0;
--
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