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From: H. Peter Anvin on 6 Aug 2010 19:10
Hi Linus,

The following changes since commit fc1caf6eafb30ea185720e29f7f5eccca61ecd60:

Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 (2010-08-05 16:02:01 -0700)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-mce-for-linus

Huang Ying (4):
x86, mce: Rename MSR_IA32_MCx_CTL2 value
x86, mce: Fix MSR_IA32_MCI_CTL2 CMCI threshold setup
x86, mce: Add HW_ERR printk prefix for hardware error logging
x86, mce: Use HW_ERR in MCE handler

arch/x86/include/asm/mce.h | 4 ++++
arch/x86/include/asm/msr-index.h | 3 ---
arch/x86/kernel/cpu/mcheck/mce.c | 32 ++++++++++----------------------
arch/x86/kernel/cpu/mcheck/mce_intel.c | 9 +++++----
include/linux/kernel.h | 7 +++++++
5 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index f32a430..c62c13c 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -38,6 +38,10 @@
#define MCM_ADDR_MEM 3 /* memory address */
#define MCM_ADDR_GENERIC 7 /* generic */

+/* CTL2 register defines */
+#define MCI_CTL2_CMCI_EN (1ULL << 30)
+#define MCI_CTL2_CMCI_THRESHOLD_MASK 0x7fffULL
+
#define MCJ_CTX_MASK 3
#define MCJ_CTX(flags) ((flags) & MCJ_CTX_MASK)
#define MCJ_CTX_RANDOM 0 /* inject context: random */
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 509a421..33184c2 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -96,9 +96,6 @@
#define MSR_IA32_MC0_CTL2 0x00000280
#define MSR_IA32_MCx_CTL2(x) (MSR_IA32_MC0_CTL2 + (x))

-#define CMCI_EN (1ULL << 30)
-#define CMCI_THRESHOLD_MASK 0xffffULL
-
#define MSR_P6_PERFCTR0 0x000000c1
#define MSR_P6_PERFCTR1 0x000000c2
#define MSR_P6_EVNTSEL0 0x00000186
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 1970ef9..bba547d 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -107,8 +107,8 @@ EXPORT_SYMBOL_GPL(x86_mce_decoder_chain);
static int default_decode_mce(struct notifier_block *nb, unsigned long val,
void *data)
{
- pr_emerg("No human readable MCE decoding support on this CPU type.\n");
- pr_emerg("Run the message through 'mcelog --ascii' to decode.\n");
+ pr_emerg(HW_ERR "No human readable MCE decoding support on this CPU type.\n");
+ pr_emerg(HW_ERR "Run the message through 'mcelog --ascii' to decode.\n");

return NOTIFY_STOP;
}
@@ -211,11 +211,11 @@ void mce_log(struct mce *mce)

static void print_mce(struct mce *m)
{
- pr_emerg("CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n",
+ pr_emerg(HW_ERR "CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n",
m->extcpu, m->mcgstatus, m->bank, m->status);

if (m->ip) {
- pr_emerg("RIP%s %02x:<%016Lx> ",
+ pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ",
!(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
m->cs, m->ip);

@@ -224,14 +224,14 @@ static void print_mce(struct mce *m)
pr_cont("\n");
}

- pr_emerg("TSC %llx ", m->tsc);
+ pr_emerg(HW_ERR "TSC %llx ", m->tsc);
if (m->addr)
pr_cont("ADDR %llx ", m->addr);
if (m->misc)
pr_cont("MISC %llx ", m->misc);

pr_cont("\n");
- pr_emerg("PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n",
+ pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n",
m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid);

/*
@@ -241,16 +241,6 @@ static void print_mce(struct mce *m)
atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m);
}

-static void print_mce_head(void)
-{
- pr_emerg("\nHARDWARE ERROR\n");
-}
-
-static void print_mce_tail(void)
-{
- pr_emerg("This is not a software problem!\n");
-}
-
#define PANIC_TIMEOUT 5 /* 5 seconds */

static atomic_t mce_paniced;
@@ -291,7 +281,6 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
if (atomic_inc_return(&mce_fake_paniced) > 1)
return;
}
- print_mce_head();
/* First print corrected ones that are still unlogged */
for (i = 0; i < MCE_LOG_LEN; i++) {
struct mce *m = &mcelog.entry[i];
@@ -322,16 +311,15 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
apei_err = apei_write_mce(final);
}
if (cpu_missing)
- printk(KERN_EMERG "Some CPUs didn't answer in synchronization\n");
- print_mce_tail();
+ pr_emerg(HW_ERR "Some CPUs didn't answer in synchronization\n");
if (exp)
- printk(KERN_EMERG "Machine check: %s\n", exp);
+ pr_emerg(HW_ERR "Machine check: %s\n", exp);
if (!fake_panic) {
if (panic_timeout == 0)
panic_timeout = mce_panic_timeout;
panic(msg);
} else
- printk(KERN_EMERG "Fake kernel panic: %s\n", msg);
+ pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg);
}

/* Support code for software error injection */
@@ -1221,7 +1209,7 @@ int mce_notify_irq(void)
schedule_work(&mce_trigger_work);

if (__ratelimit(&ratelimit))
- printk(KERN_INFO "Machine check events logged\n");
+ pr_info(HW_ERR "Machine check events logged\n");

return 1;
}
diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c
index 62b48e4..6fcd093 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
@@ -95,19 +95,20 @@ static void cmci_discover(int banks, int boot)
rdmsrl(MSR_IA32_MCx_CTL2(i), val);

/* Already owned by someone else? */
- if (val & CMCI_EN) {
+ if (val & MCI_CTL2_CMCI_EN) {
if (test_and_clear_bit(i, owned) && !boot)
print_update("SHD", &hdr, i);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
continue;
}

- val |= CMCI_EN | CMCI_THRESHOLD;
+ val &= ~MCI_CTL2_CMCI_THRESHOLD_MASK;
+ val |= MCI_CTL2_CMCI_EN | CMCI_THRESHOLD;
wrmsrl(MSR_IA32_MCx_CTL2(i), val);
rdmsrl(MSR_IA32_MCx_CTL2(i), val);

/* Did the enable bit stick? -- the bank supports CMCI */
- if (val & CMCI_EN) {
+ if (val & MCI_CTL2_CMCI_EN) {
if (!test_and_set_bit(i, owned) && !boot)
print_update("CMCI", &hdr, i);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
@@ -155,7 +156,7 @@ void cmci_clear(void)
continue;
/* Disable CMCI */
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
- val &= ~(CMCI_EN|CMCI_THRESHOLD_MASK);
+ val &= ~(MCI_CTL2_CMCI_EN|MCI_CTL2_CMCI_THRESHOLD_MASK);
wrmsrl(MSR_IA32_MCx_CTL2(i), val);
__clear_bit(i, __get_cpu_var(mce_banks_owned));
}
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 5de838b..f05a468 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -252,6 +252,13 @@ extern struct pid *session_of_pgrp(struct pid *pgrp);
#define FW_WARN "[Firmware Warn]: "
#define FW_INFO "[Firmware Info]: "

+/*
+ * HW_ERR
+ * Add this to a message for hardware errors, so that user can report
+ * it to hardware vendor instead of LKML or software vendor.
+ */
+#define HW_ERR "[Hardware Error]: "
+
#ifdef CONFIG_PRINTK
asmlinkage int vprintk(const char *fmt, va_list args)
__attribute__ ((format (printf, 1, 0)));
--
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