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Date: Mon, 27 Aug 2012 18:34:08 +0200
From: Borislav Petkov <bp@...64.org>
To: "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc: Borislav Petkov <bp@...64.org>, tony.luck@...el.com,
andi@...stfloor.org, gong.chen@...ux.intel.com, ananth@...ibm.com,
masbock@...ux.vnet.ibm.com, x86@...nel.org,
linux-kernel@...r.kernel.org, lcm@...ibm.com, mingo@...hat.com,
tglx@...utronix.de, linux-edac@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/mce: Pack boolean MCE boot flags into a structure
On Mon, Aug 27, 2012 at 09:31:11PM +0530, Naveen N. Rao wrote:
> On 08/27/2012 09:17 PM, Borislav Petkov wrote:
> >On Mon, Aug 27, 2012 at 09:05:46PM +0530, Naveen N. Rao wrote:
> >>>>+
> >>>>+extern struct mce_boot_flags mce_boot_flags;
> >>>
> >>>Why do we need that extern thing?
> >>
> >>So that this is visible across mce.c and mce_intel.c?
> >
> >Ok. But if you move the struct to mce-internal.h and since both .c files
> >include it, we shouldn't need that extern, right?
>
> I'm not sure I understand. I think we still need it. This is not
> about the structure, but the variable itself. extern allows
> mce_boot_flags _variable_ accessible from mce_intel.c.
Ok, you're right. I actually was thinking of having athe extern at the
place it is used, i.e. mce_intel.c but looking at mce-internal, it has a
bunch of other externs so let keep it that way.
But, I went and did change your patch a bit because I think
mce_boot_flags is not such a fitting name if we want to move more of
those items at the beginning of mce.c to it. Basically, I'd like to put
all those MCE vendor-specific config settings into one struct which
encapsulates them all together in a clean way instead of having a bunch
of single variables all over the place.
IOW, how about the following?
--
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index a3ac52b29cbf..e5cfd241e508 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -126,7 +126,6 @@ struct mce_log {
#define K8_MCE_THRESHOLD_BANK_5 (MCE_THRESHOLD_BASE + 5 * 9)
#define K8_MCE_THRESHOLD_DRAM_ECC (MCE_THRESHOLD_BANK_4 + 0)
-
#ifdef __KERNEL__
extern void mce_register_decode_chain(struct notifier_block *nb);
@@ -169,8 +168,6 @@ DECLARE_PER_CPU(struct device *, mce_device);
#define MAX_NR_BANKS 32
#ifdef CONFIG_X86_MCE_INTEL
-extern int mce_cmci_disabled;
-extern int mce_ignore_ce;
void mce_intel_feature_init(struct cpuinfo_x86 *c);
void cmci_clear(void);
void cmci_reenable(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
index 6a05c1d327a9..3b25bcf452d9 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
+++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
@@ -28,6 +28,15 @@ extern int mce_ser;
extern struct mce_bank *mce_banks;
+struct mce_cfg {
+ __u32 cmci_disabled : 1,
+ ignore_ce : 1,
+ dont_log_ce : 1,
+ __pad : 29;
+};
+
+extern struct mce_cfg cfg;
+
#ifdef CONFIG_X86_MCE_INTEL
unsigned long mce_intel_adjust_timer(unsigned long interval);
void mce_intel_cmci_poll(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index c311122ea838..db3c5eaa16da 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -79,11 +79,10 @@ static int rip_msr __read_mostly;
static int mce_bootlog __read_mostly = -1;
static int monarch_timeout __read_mostly = -1;
static int mce_panic_timeout __read_mostly;
-static int mce_dont_log_ce __read_mostly;
-int mce_cmci_disabled __read_mostly;
-int mce_ignore_ce __read_mostly;
int mce_ser __read_mostly;
+struct mce_cfg cfg __read_mostly;
+
struct mce_bank *mce_banks __read_mostly;
/* User mode helper program triggered by machine check event */
@@ -630,7 +629,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
* Don't get the IP here because it's unlikely to
* have anything to do with the actual error location.
*/
- if (!(flags & MCP_DONTLOG) && !mce_dont_log_ce)
+ if (!(flags & MCP_DONTLOG) && !cfg.dont_log_ce)
mce_log(&m);
/*
@@ -1634,7 +1633,7 @@ static void mce_start_timer(unsigned int cpu, struct timer_list *t)
__this_cpu_write(mce_next_interval, iv);
- if (mce_ignore_ce || !iv)
+ if (cfg.ignore_ce || !iv)
return;
t->expires = round_jiffies(jiffies + iv);
@@ -1958,11 +1957,11 @@ static int __init mcheck_enable(char *str)
if (!strcmp(str, "off"))
mce_disabled = 1;
else if (!strcmp(str, "no_cmci"))
- mce_cmci_disabled = 1;
+ cfg.cmci_disabled = 1;
else if (!strcmp(str, "dont_log_ce"))
- mce_dont_log_ce = 1;
+ cfg.dont_log_ce = 1;
else if (!strcmp(str, "ignore_ce"))
- mce_ignore_ce = 1;
+ cfg.ignore_ce = 1;
else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog"))
mce_bootlog = (str[0] == 'b');
else if (isdigit(str[0])) {
@@ -2115,7 +2114,7 @@ show_trigger(struct device *s, struct device_attribute *attr, char *buf)
}
static ssize_t set_trigger(struct device *s, struct device_attribute *attr,
- const char *buf, size_t siz)
+ const char *buf, size_t size)
{
char *p;
@@ -2129,6 +2128,34 @@ static ssize_t set_trigger(struct device *s, struct device_attribute *attr,
return strlen(mce_helper) + !!p;
}
+static ssize_t get_dont_log_ce(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", cfg.dont_log_ce);
+}
+
+static ssize_t set_dont_log_ce(struct device *s,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ u64 new;
+
+ if (strict_strtoull(buf, 0, &new) < 0)
+ return -EINVAL;
+
+ cfg.dont_log_ce = !!new;
+
+ return size;
+}
+
+static ssize_t get_ignore_ce(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", cfg.ignore_ce);
+}
+
static ssize_t set_ignore_ce(struct device *s,
struct device_attribute *attr,
const char *buf, size_t size)
@@ -2138,21 +2165,28 @@ static ssize_t set_ignore_ce(struct device *s,
if (strict_strtoull(buf, 0, &new) < 0)
return -EINVAL;
- if (mce_ignore_ce ^ !!new) {
+ if (cfg.ignore_ce ^ !!new) {
if (new) {
/* disable ce features */
mce_timer_delete_all();
on_each_cpu(mce_disable_cmci, NULL, 1);
- mce_ignore_ce = 1;
+ cfg.ignore_ce = 1;
} else {
/* enable ce features */
- mce_ignore_ce = 0;
+ cfg.ignore_ce = 0;
on_each_cpu(mce_enable_ce, (void *)1, 1);
}
}
return size;
}
+static ssize_t get_cmci_disabled(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", cfg.cmci_disabled);
+}
+
static ssize_t set_cmci_disabled(struct device *s,
struct device_attribute *attr,
const char *buf, size_t size)
@@ -2162,14 +2196,14 @@ static ssize_t set_cmci_disabled(struct device *s,
if (strict_strtoull(buf, 0, &new) < 0)
return -EINVAL;
- if (mce_cmci_disabled ^ !!new) {
+ if (cfg.cmci_disabled ^ !!new) {
if (new) {
/* disable cmci */
on_each_cpu(mce_disable_cmci, NULL, 1);
- mce_cmci_disabled = 1;
+ cfg.cmci_disabled = 1;
} else {
/* enable cmci */
- mce_cmci_disabled = 0;
+ cfg.cmci_disabled = 0;
on_each_cpu(mce_enable_ce, NULL, 1);
}
}
@@ -2188,31 +2222,23 @@ static ssize_t store_int_with_restart(struct device *s,
static DEVICE_ATTR(trigger, 0644, show_trigger, set_trigger);
static DEVICE_INT_ATTR(tolerant, 0644, tolerant);
static DEVICE_INT_ATTR(monarch_timeout, 0644, monarch_timeout);
-static DEVICE_INT_ATTR(dont_log_ce, 0644, mce_dont_log_ce);
+static DEVICE_ATTR(dont_log_ce, 0644, get_dont_log_ce, set_dont_log_ce);
+static DEVICE_ATTR(ignore_ce, 0644, get_ignore_ce, set_ignore_ce);
+static DEVICE_ATTR(cmci_disabled, 0644, get_cmci_disabled, set_cmci_disabled);
static struct dev_ext_attribute dev_attr_check_interval = {
__ATTR(check_interval, 0644, device_show_int, store_int_with_restart),
&check_interval
};
-static struct dev_ext_attribute dev_attr_ignore_ce = {
- __ATTR(ignore_ce, 0644, device_show_int, set_ignore_ce),
- &mce_ignore_ce
-};
-
-static struct dev_ext_attribute dev_attr_cmci_disabled = {
- __ATTR(cmci_disabled, 0644, device_show_int, set_cmci_disabled),
- &mce_cmci_disabled
-};
-
static struct device_attribute *mce_device_attrs[] = {
&dev_attr_tolerant.attr,
&dev_attr_check_interval.attr,
&dev_attr_trigger,
&dev_attr_monarch_timeout.attr,
- &dev_attr_dont_log_ce.attr,
- &dev_attr_ignore_ce.attr,
- &dev_attr_cmci_disabled.attr,
+ &dev_attr_dont_log_ce,
+ &dev_attr_ignore_ce,
+ &dev_attr_cmci_disabled,
NULL
};
diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c
index 098386fed48e..f0cf857ba389 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
@@ -53,7 +53,7 @@ static int cmci_supported(int *banks)
{
u64 cap;
- if (mce_cmci_disabled || mce_ignore_ce)
+ if (cfg.cmci_disabled || cfg.ignore_ce)
return 0;
/*
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
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