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x86: mce: Move per bank data in a single datastructure
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This addresses one of the leftover review comments.

Move the per bank data into a single structure. This avoids
several separate variables and also separate allocation of sysfs objects.

I didn't move the CMCI ownership information so far because
that would have needed some non trivial changes in the algorithms.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Andi Kleen authored and H. Peter Anvin committed Jul 10, 2009
1 parent 9eda8cb commit cebe182
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Showing 2 changed files with 67 additions and 56 deletions.
14 changes: 14 additions & 0 deletions arch/x86/kernel/cpu/mcheck/mce-internal.h
View file
Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
#include <linux/sysdev.h>
#include <asm/mce.h>

enum severity_level {
Expand All @@ -10,6 +11,19 @@ enum severity_level {
MCE_PANIC_SEVERITY,
};

#define ATTR_LEN 16

/* One object for each MCE bank, shared by all CPUs */
struct mce_bank {
u64 ctl; /* subevents to enable */
unsigned char init; /* initialise bank? */
struct sysdev_attribute attr; /* sysdev attribute */
char attrname[ATTR_LEN]; /* attribute name */
};

int mce_severity(struct mce *a, int tolerant, char **msg);

extern int mce_ser;

extern struct mce_bank *mce_banks;

109 changes: 53 additions & 56 deletions arch/x86/kernel/cpu/mcheck/mce.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,6 @@ DEFINE_PER_CPU(unsigned, mce_exception_count);
*/
static int tolerant __read_mostly = 1;
static int banks __read_mostly;
static u64 *bank __read_mostly;
static int rip_msr __read_mostly;
static int mce_bootlog __read_mostly = -1;
static int monarch_timeout __read_mostly = -1;
Expand All @@ -74,13 +73,13 @@ int mce_cmci_disabled __read_mostly;
int mce_ignore_ce __read_mostly;
int mce_ser __read_mostly;

struct mce_bank *mce_banks __read_mostly;

/* User mode helper program triggered by machine check event */
static unsigned long mce_need_notify;
static char mce_helper[128];
static char *mce_helper_argv[2] = { mce_helper, NULL };

static unsigned long dont_init_banks;

static DECLARE_WAIT_QUEUE_HEAD(mce_wait);
static DEFINE_PER_CPU(struct mce, mces_seen);
static int cpu_missing;
Expand All @@ -91,11 +90,6 @@ DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = {
[0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL
};

static inline int skip_bank_init(int i)
{
return i < BITS_PER_LONG && test_bit(i, &dont_init_banks);
}

static DEFINE_PER_CPU(struct work_struct, mce_work);

/* Do initial initialization of a struct mce */
Expand Down Expand Up @@ -482,7 +476,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)

m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
for (i = 0; i < banks; i++) {
if (!bank[i] || !test_bit(i, *b))
if (!mce_banks[i].ctl || !test_bit(i, *b))
continue;

m.misc = 0;
Expand Down Expand Up @@ -903,7 +897,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
order = mce_start(&no_way_out);
for (i = 0; i < banks; i++) {
__clear_bit(i, toclear);
if (!bank[i])
if (!mce_banks[i].ctl)
continue;

m.misc = 0;
Expand Down Expand Up @@ -1146,6 +1140,21 @@ int mce_notify_irq(void)
}
EXPORT_SYMBOL_GPL(mce_notify_irq);

static int mce_banks_init(void)
{
int i;

mce_banks = kzalloc(banks * sizeof(struct mce_bank), GFP_KERNEL);
if (!mce_banks)
return -ENOMEM;
for (i = 0; i < banks; i++) {
struct mce_bank *b = &mce_banks[i];
b->ctl = -1ULL;
b->init = 1;
}
return 0;
}

/*
* Initialize Machine Checks for a CPU.
*/
Expand All @@ -1169,11 +1178,10 @@ static int mce_cap_init(void)
/* Don't support asymmetric configurations today */
WARN_ON(banks != 0 && b != banks);
banks = b;
if (!bank) {
bank = kmalloc(banks * sizeof(u64), GFP_KERNEL);
if (!bank)
return -ENOMEM;
memset(bank, 0xff, banks * sizeof(u64));
if (!mce_banks) {
int err = mce_banks_init();
if (err)
return err;
}

/* Use accurate RIP reporting if available. */
Expand Down Expand Up @@ -1205,9 +1213,10 @@ static void mce_init(void)
wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);

for (i = 0; i < banks; i++) {
if (skip_bank_init(i))
struct mce_bank *b = &mce_banks[i];
if (!b->init)
continue;
wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]);
wrmsrl(MSR_IA32_MC0_CTL+4*i, b->ctl);
wrmsrl(MSR_IA32_MC0_STATUS+4*i, 0);
}
}
Expand All @@ -1223,7 +1232,7 @@ static void mce_cpu_quirks(struct cpuinfo_x86 *c)
* trips off incorrectly with the IOMMU & 3ware
* & Cerberus:
*/
clear_bit(10, (unsigned long *)&bank[4]);
clear_bit(10, (unsigned long *)&mce_banks[4].ctl);
}
if (c->x86 <= 17 && mce_bootlog < 0) {
/*
Expand All @@ -1237,7 +1246,7 @@ static void mce_cpu_quirks(struct cpuinfo_x86 *c)
* by default.
*/
if (c->x86 == 6 && banks > 0)
bank[0] = 0;
mce_banks[0].ctl = 0;
}

if (c->x86_vendor == X86_VENDOR_INTEL) {
Expand All @@ -1250,8 +1259,8 @@ static void mce_cpu_quirks(struct cpuinfo_x86 *c)
* valid event later, merely don't write CTL0.
*/

if (c->x86 == 6 && c->x86_model < 0x1A)
__set_bit(0, &dont_init_banks);
if (c->x86 == 6 && c->x86_model < 0x1A && banks > 0)
mce_banks[0].init = 0;

/*
* All newer Intel systems support MCE broadcasting. Enable
Expand Down Expand Up @@ -1578,7 +1587,8 @@ static int mce_disable(void)
int i;

for (i = 0; i < banks; i++) {
if (!skip_bank_init(i))
struct mce_bank *b = &mce_banks[i];
if (b->init)
wrmsrl(MSR_IA32_MC0_CTL + i*4, 0);
}
return 0;
Expand Down Expand Up @@ -1654,14 +1664,15 @@ DEFINE_PER_CPU(struct sys_device, mce_dev);
__cpuinitdata
void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu);

static struct sysdev_attribute *bank_attrs;
static inline struct mce_bank *attr_to_bank(struct sysdev_attribute *attr)
{
return container_of(attr, struct mce_bank, attr);
}

static ssize_t show_bank(struct sys_device *s, struct sysdev_attribute *attr,
char *buf)
{
u64 b = bank[attr - bank_attrs];

return sprintf(buf, "%llx\n", b);
return sprintf(buf, "%llx\n", attr_to_bank(attr)->ctl);
}

static ssize_t set_bank(struct sys_device *s, struct sysdev_attribute *attr,
Expand All @@ -1672,7 +1683,7 @@ static ssize_t set_bank(struct sys_device *s, struct sysdev_attribute *attr,
if (strict_strtoull(buf, 0, &new) < 0)
return -EINVAL;

bank[attr - bank_attrs] = new;
attr_to_bank(attr)->ctl = new;
mce_restart();

return size;
Expand Down Expand Up @@ -1816,7 +1827,7 @@ static __cpuinit int mce_create_device(unsigned int cpu)
}
for (j = 0; j < banks; j++) {
err = sysdev_create_file(&per_cpu(mce_dev, cpu),
&bank_attrs[j]);
&mce_banks[j].attr);
if (err)
goto error2;
}
Expand All @@ -1825,10 +1836,10 @@ static __cpuinit int mce_create_device(unsigned int cpu)
return 0;
error2:
while (--j >= 0)
sysdev_remove_file(&per_cpu(mce_dev, cpu), &bank_attrs[j]);
sysdev_remove_file(&per_cpu(mce_dev, cpu), &mce_banks[j].attr);
error:
while (--i >= 0)
sysdev_remove_file(&per_cpu(mce_dev, cpu), mce_attrs[i]);
sysdev_remove_file(&per_cpu(mce_dev, cpu), &mce_banks[i].attr);

sysdev_unregister(&per_cpu(mce_dev, cpu));

Expand All @@ -1846,7 +1857,7 @@ static __cpuinit void mce_remove_device(unsigned int cpu)
sysdev_remove_file(&per_cpu(mce_dev, cpu), mce_attrs[i]);

for (i = 0; i < banks; i++)
sysdev_remove_file(&per_cpu(mce_dev, cpu), &bank_attrs[i]);
sysdev_remove_file(&per_cpu(mce_dev, cpu), &mce_banks[i].attr);

sysdev_unregister(&per_cpu(mce_dev, cpu));
cpumask_clear_cpu(cpu, mce_dev_initialized);
Expand All @@ -1863,7 +1874,8 @@ static void mce_disable_cpu(void *h)
if (!(action & CPU_TASKS_FROZEN))
cmci_clear();
for (i = 0; i < banks; i++) {
if (!skip_bank_init(i))
struct mce_bank *b = &mce_banks[i];
if (b->init)
wrmsrl(MSR_IA32_MC0_CTL + i*4, 0);
}
}
Expand All @@ -1879,8 +1891,9 @@ static void mce_reenable_cpu(void *h)
if (!(action & CPU_TASKS_FROZEN))
cmci_reenable();
for (i = 0; i < banks; i++) {
if (!skip_bank_init(i))
wrmsrl(MSR_IA32_MC0_CTL + i*4, bank[i]);
struct mce_bank *b = &mce_banks[i];
if (b->init)
wrmsrl(MSR_IA32_MC0_CTL + i*4, b->ctl);
}
}

Expand Down Expand Up @@ -1928,35 +1941,21 @@ static struct notifier_block mce_cpu_notifier __cpuinitdata = {
.notifier_call = mce_cpu_callback,
};

static __init int mce_init_banks(void)
static __init void mce_init_banks(void)
{
int i;

bank_attrs = kzalloc(sizeof(struct sysdev_attribute) * banks,
GFP_KERNEL);
if (!bank_attrs)
return -ENOMEM;

for (i = 0; i < banks; i++) {
struct sysdev_attribute *a = &bank_attrs[i];
struct mce_bank *b = &mce_banks[i];
struct sysdev_attribute *a = &b->attr;

a->attr.name = kasprintf(GFP_KERNEL, "bank%d", i);
if (!a->attr.name)
goto nomem;
a->attr.name = b->attrname;
snprintf(b->attrname, ATTR_LEN, "bank%d", i);

a->attr.mode = 0644;
a->show = show_bank;
a->store = set_bank;
}
return 0;

nomem:
while (--i >= 0)
kfree(bank_attrs[i].attr.name);
kfree(bank_attrs);
bank_attrs = NULL;

return -ENOMEM;
}

static __init int mce_init_device(void)
Expand All @@ -1969,9 +1968,7 @@ static __init int mce_init_device(void)

zalloc_cpumask_var(&mce_dev_initialized, GFP_KERNEL);

err = mce_init_banks();
if (err)
return err;
mce_init_banks();

err = sysdev_class_register(&mce_sysclass);
if (err)
Expand Down

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