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Commit cebe1820 authored by Andi Kleen's avatar Andi Kleen Committed by H. Peter Anvin
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x86: mce: Move per bank data in a single datastructure 



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: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 9eda8cb3

arch/x86/kernel/cpu/mcheck/mce-internal.h

+14 −0
Original line number Diff line number Diff line 
#include <linux/sysdev.h>

#include <asm/mce.h>



enum severity_level {
@@ -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;

arch/x86/kernel/cpu/mcheck/mce.c

+53 −56
Original line number Diff line number Diff line
@@ -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;
@@ -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;
@@ -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 */
@@ -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;
@@ -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;
@@ -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.

 */
@@ -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. */
@@ -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);

	}

}
@@ -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) {

			/*
@@ -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) {
@@ -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
@@ -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;
@@ -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,
@@ -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;
@@ -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;

	}
@@ -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));
@@ -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);
@@ -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);

	}

}
@@ -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);

	}

}
@@ -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)
@@ -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)