1 files changed, 689 insertions, 0 deletions

diff --git a/arch/x86/kernel/mce_amd_64.c b/arch/x86/kernel/mce_amd_64.c
new file mode 100644
index 000000000000..2f8a7f18b0fe
--- /dev/null
+++ b/arch/x86/kernel/mce_amd_64.c
@@ -0,0 +1,689 @@
+/*
+ *  (c) 2005, 2006 Advanced Micro Devices, Inc.
+ *  Your use of this code is subject to the terms and conditions of the
+ *  GNU general public license version 2. See "COPYING" or
+ *  http://www.gnu.org/licenses/gpl.html
+ *
+ *  Written by Jacob Shin - AMD, Inc.
+ *
+ *  Support : jacob.shin@amd.com
+ *
+ *  April 2006
+ *     - added support for AMD Family 0x10 processors
+ *
+ *  All MC4_MISCi registers are shared between multi-cores
+ */
+
+#include <linux/cpu.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kobject.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/sysdev.h>
+#include <linux/sysfs.h>
+#include <asm/apic.h>
+#include <asm/mce.h>
+#include <asm/msr.h>
+#include <asm/percpu.h>
+#include <asm/idle.h>
+
+#define PFX               "mce_threshold: "
+#define VERSION           "version 1.1.1"
+#define NR_BANKS          6
+#define NR_BLOCKS         9
+#define THRESHOLD_MAX     0xFFF
+#define INT_TYPE_APIC     0x00020000
+#define MASK_VALID_HI     0x80000000
+#define MASK_CNTP_HI      0x40000000
+#define MASK_LOCKED_HI    0x20000000
+#define MASK_LVTOFF_HI    0x00F00000
+#define MASK_COUNT_EN_HI  0x00080000
+#define MASK_INT_TYPE_HI  0x00060000
+#define MASK_OVERFLOW_HI  0x00010000
+#define MASK_ERR_COUNT_HI 0x00000FFF
+#define MASK_BLKPTR_LO    0xFF000000
+#define MCG_XBLK_ADDR     0xC0000400
+
+struct threshold_block {
+	unsigned int block;
+	unsigned int bank;
+	unsigned int cpu;
+	u32 address;
+	u16 interrupt_enable;
+	u16 threshold_limit;
+	struct kobject kobj;
+	struct list_head miscj;
+};
+
+/* defaults used early on boot */
+static struct threshold_block threshold_defaults = {
+	.interrupt_enable = 0,
+	.threshold_limit = THRESHOLD_MAX,
+};
+
+struct threshold_bank {
+	struct kobject kobj;
+	struct threshold_block *blocks;
+	cpumask_t cpus;
+};
+static DEFINE_PER_CPU(struct threshold_bank *, threshold_banks[NR_BANKS]);
+
+#ifdef CONFIG_SMP
+static unsigned char shared_bank[NR_BANKS] = {
+	0, 0, 0, 0, 1
+};
+#endif
+
+static DEFINE_PER_CPU(unsigned char, bank_map);	/* see which banks are on */
+
+/*
+ * CPU Initialization
+ */
+
+/* must be called with correct cpu affinity */
+static void threshold_restart_bank(struct threshold_block *b,
+				   int reset, u16 old_limit)
+{
+	u32 mci_misc_hi, mci_misc_lo;
+
+	rdmsr(b->address, mci_misc_lo, mci_misc_hi);
+
+	if (b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
+		reset = 1;	/* limit cannot be lower than err count */
+
+	if (reset) {		/* reset err count and overflow bit */
+		mci_misc_hi =
+		    (mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
+		    (THRESHOLD_MAX - b->threshold_limit);
+	} else if (old_limit) {	/* change limit w/o reset */
+		int new_count = (mci_misc_hi & THRESHOLD_MAX) +
+		    (old_limit - b->threshold_limit);
+		mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
+		    (new_count & THRESHOLD_MAX);
+	}
+
+	b->interrupt_enable ?
+	    (mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
+	    (mci_misc_hi &= ~MASK_INT_TYPE_HI);
+
+	mci_misc_hi |= MASK_COUNT_EN_HI;
+	wrmsr(b->address, mci_misc_lo, mci_misc_hi);
+}
+
+/* cpu init entry point, called from mce.c with preempt off */
+void __cpuinit mce_amd_feature_init(struct cpuinfo_x86 *c)
+{
+	unsigned int bank, block;
+	unsigned int cpu = smp_processor_id();
+	u32 low = 0, high = 0, address = 0;
+
+	for (bank = 0; bank < NR_BANKS; ++bank) {
+		for (block = 0; block < NR_BLOCKS; ++block) {
+			if (block == 0)
+				address = MSR_IA32_MC0_MISC + bank * 4;
+			else if (block == 1) {
+				address = (low & MASK_BLKPTR_LO) >> 21;
+				if (!address)
+					break;
+				address += MCG_XBLK_ADDR;
+			}
+			else
+				++address;
+
+			if (rdmsr_safe(address, &low, &high))
+				break;
+
+			if (!(high & MASK_VALID_HI)) {
+				if (block)
+					continue;
+				else
+					break;
+			}
+
+			if (!(high & MASK_CNTP_HI)  ||
+			     (high & MASK_LOCKED_HI))
+				continue;
+
+			if (!block)
+				per_cpu(bank_map, cpu) |= (1 << bank);
+#ifdef CONFIG_SMP
+			if (shared_bank[bank] && c->cpu_core_id)
+				break;
+#endif
+			high &= ~MASK_LVTOFF_HI;
+			high |= K8_APIC_EXT_LVT_ENTRY_THRESHOLD << 20;
+			wrmsr(address, low, high);
+
+			setup_APIC_extended_lvt(K8_APIC_EXT_LVT_ENTRY_THRESHOLD,
+						THRESHOLD_APIC_VECTOR,
+						K8_APIC_EXT_INT_MSG_FIX, 0);
+
+			threshold_defaults.address = address;
+			threshold_restart_bank(&threshold_defaults, 0, 0);
+		}
+	}
+}
+
+/*
+ * APIC Interrupt Handler
+ */
+
+/*
+ * threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
+ * the interrupt goes off when error_count reaches threshold_limit.
+ * the handler will simply log mcelog w/ software defined bank number.
+ */
+asmlinkage void mce_threshold_interrupt(void)
+{
+	unsigned int bank, block;
+	struct mce m;
+	u32 low = 0, high = 0, address = 0;
+
+	ack_APIC_irq();
+	exit_idle();
+	irq_enter();
+
+	memset(&m, 0, sizeof(m));
+	rdtscll(m.tsc);
+	m.cpu = smp_processor_id();
+
+	/* assume first bank caused it */
+	for (bank = 0; bank < NR_BANKS; ++bank) {
+		if (!(per_cpu(bank_map, m.cpu) & (1 << bank)))
+			continue;
+		for (block = 0; block < NR_BLOCKS; ++block) {
+			if (block == 0)
+				address = MSR_IA32_MC0_MISC + bank * 4;
+			else if (block == 1) {
+				address = (low & MASK_BLKPTR_LO) >> 21;
+				if (!address)
+					break;
+				address += MCG_XBLK_ADDR;
+			}
+			else
+				++address;
+
+			if (rdmsr_safe(address, &low, &high))
+				break;
+
+			if (!(high & MASK_VALID_HI)) {
+				if (block)
+					continue;
+				else
+					break;
+			}
+
+			if (!(high & MASK_CNTP_HI)  ||
+			     (high & MASK_LOCKED_HI))
+				continue;
+
+			/* Log the machine check that caused the threshold
+			   event. */
+			do_machine_check(NULL, 0);
+
+			if (high & MASK_OVERFLOW_HI) {
+				rdmsrl(address, m.misc);
+				rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,
+				       m.status);
+				m.bank = K8_MCE_THRESHOLD_BASE
+				       + bank * NR_BLOCKS
+				       + block;
+				mce_log(&m);
+				goto out;
+			}
+		}
+	}
+out:
+	irq_exit();
+}
+
+/*
+ * Sysfs Interface
+ */
+
+struct threshold_attr {
+	struct attribute attr;
+	ssize_t(*show) (struct threshold_block *, char *);
+	ssize_t(*store) (struct threshold_block *, const char *, size_t count);
+};
+
+static cpumask_t affinity_set(unsigned int cpu)
+{
+	cpumask_t oldmask = current->cpus_allowed;
+	cpumask_t newmask = CPU_MASK_NONE;
+	cpu_set(cpu, newmask);
+	set_cpus_allowed(current, newmask);
+	return oldmask;
+}
+
+static void affinity_restore(cpumask_t oldmask)
+{
+	set_cpus_allowed(current, oldmask);
+}
+
+#define SHOW_FIELDS(name)                                           \
+static ssize_t show_ ## name(struct threshold_block * b, char *buf) \
+{                                                                   \
+        return sprintf(buf, "%lx\n", (unsigned long) b->name);      \
+}
+SHOW_FIELDS(interrupt_enable)
+SHOW_FIELDS(threshold_limit)
+
+static ssize_t store_interrupt_enable(struct threshold_block *b,
+				      const char *buf, size_t count)
+{
+	char *end;
+	cpumask_t oldmask;
+	unsigned long new = simple_strtoul(buf, &end, 0);
+	if (end == buf)
+		return -EINVAL;
+	b->interrupt_enable = !!new;
+
+	oldmask = affinity_set(b->cpu);
+	threshold_restart_bank(b, 0, 0);
+	affinity_restore(oldmask);
+
+	return end - buf;
+}
+
+static ssize_t store_threshold_limit(struct threshold_block *b,
+				     const char *buf, size_t count)
+{
+	char *end;
+	cpumask_t oldmask;
+	u16 old;
+	unsigned long new = simple_strtoul(buf, &end, 0);
+	if (end == buf)
+		return -EINVAL;
+	if (new > THRESHOLD_MAX)
+		new = THRESHOLD_MAX;
+	if (new < 1)
+		new = 1;
+	old = b->threshold_limit;
+	b->threshold_limit = new;
+
+	oldmask = affinity_set(b->cpu);
+	threshold_restart_bank(b, 0, old);
+	affinity_restore(oldmask);
+
+	return end - buf;
+}
+
+static ssize_t show_error_count(struct threshold_block *b, char *buf)
+{
+	u32 high, low;
+	cpumask_t oldmask;
+	oldmask = affinity_set(b->cpu);
+	rdmsr(b->address, low, high);
+	affinity_restore(oldmask);
+	return sprintf(buf, "%x\n",
+		       (high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit));
+}
+
+static ssize_t store_error_count(struct threshold_block *b,
+				 const char *buf, size_t count)
+{
+	cpumask_t oldmask;
+	oldmask = affinity_set(b->cpu);
+	threshold_restart_bank(b, 1, 0);
+	affinity_restore(oldmask);
+	return 1;
+}
+
+#define THRESHOLD_ATTR(_name,_mode,_show,_store) {            \
+        .attr = {.name = __stringify(_name), .mode = _mode }, \
+        .show = _show,                                        \
+        .store = _store,                                      \
+};
+
+#define RW_ATTR(name)                                           \
+static struct threshold_attr name =                             \
+        THRESHOLD_ATTR(name, 0644, show_## name, store_## name)
+
+RW_ATTR(interrupt_enable);
+RW_ATTR(threshold_limit);
+RW_ATTR(error_count);
+
+static struct attribute *default_attrs[] = {
+	&interrupt_enable.attr,
+	&threshold_limit.attr,
+	&error_count.attr,
+	NULL
+};
+
+#define to_block(k) container_of(k, struct threshold_block, kobj)
+#define to_attr(a) container_of(a, struct threshold_attr, attr)
+
+static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
+{
+	struct threshold_block *b = to_block(kobj);
+	struct threshold_attr *a = to_attr(attr);
+	ssize_t ret;
+	ret = a->show ? a->show(b, buf) : -EIO;
+	return ret;
+}
+
+static ssize_t store(struct kobject *kobj, struct attribute *attr,
+		     const char *buf, size_t count)
+{
+	struct threshold_block *b = to_block(kobj);
+	struct threshold_attr *a = to_attr(attr);
+	ssize_t ret;
+	ret = a->store ? a->store(b, buf, count) : -EIO;
+	return ret;
+}
+
+static struct sysfs_ops threshold_ops = {
+	.show = show,
+	.store = store,
+};
+
+static struct kobj_type threshold_ktype = {
+	.sysfs_ops = &threshold_ops,
+	.default_attrs = default_attrs,
+};
+
+static __cpuinit int allocate_threshold_blocks(unsigned int cpu,
+					       unsigned int bank,
+					       unsigned int block,
+					       u32 address)
+{
+	int err;
+	u32 low, high;
+	struct threshold_block *b = NULL;
+
+	if ((bank >= NR_BANKS) || (block >= NR_BLOCKS))
+		return 0;
+
+	if (rdmsr_safe(address, &low, &high))
+		return 0;
+
+	if (!(high & MASK_VALID_HI)) {
+		if (block)
+			goto recurse;
+		else
+			return 0;
+	}
+
+	if (!(high & MASK_CNTP_HI)  ||
+	     (high & MASK_LOCKED_HI))
+		goto recurse;
+
+	b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
+	if (!b)
+		return -ENOMEM;
+
+	b->block = block;
+	b->bank = bank;
+	b->cpu = cpu;
+	b->address = address;
+	b->interrupt_enable = 0;
+	b->threshold_limit = THRESHOLD_MAX;
+
+	INIT_LIST_HEAD(&b->miscj);
+
+	if (per_cpu(threshold_banks, cpu)[bank]->blocks)
+		list_add(&b->miscj,
+			 &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
+	else
+		per_cpu(threshold_banks, cpu)[bank]->blocks = b;
+
+	kobject_set_name(&b->kobj, "misc%i", block);
+	b->kobj.parent = &per_cpu(threshold_banks, cpu)[bank]->kobj;
+	b->kobj.ktype = &threshold_ktype;
+	err = kobject_register(&b->kobj);
+	if (err)
+		goto out_free;
+recurse:
+	if (!block) {
+		address = (low & MASK_BLKPTR_LO) >> 21;
+		if (!address)
+			return 0;
+		address += MCG_XBLK_ADDR;
+	} else
+		++address;
+
+	err = allocate_threshold_blocks(cpu, bank, ++block, address);
+	if (err)
+		goto out_free;
+
+	return err;
+
+out_free:
+	if (b) {
+		kobject_unregister(&b->kobj);
+		kfree(b);
+	}
+	return err;
+}
+
+/* symlinks sibling shared banks to first core.  first core owns dir/files. */
+static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
+{
+	int i, err = 0;
+	struct threshold_bank *b = NULL;
+	cpumask_t oldmask = CPU_MASK_NONE;
+	char name[32];
+
+	sprintf(name, "threshold_bank%i", bank);
+
+#ifdef CONFIG_SMP
+	if (cpu_data[cpu].cpu_core_id && shared_bank[bank]) {	/* symlink */
+		i = first_cpu(cpu_core_map[cpu]);
+
+		/* first core not up yet */
+		if (cpu_data[i].cpu_core_id)
+			goto out;
+
+		/* already linked */
+		if (per_cpu(threshold_banks, cpu)[bank])
+			goto out;
+
+		b = per_cpu(threshold_banks, i)[bank];
+
+		if (!b)
+			goto out;
+
+		err = sysfs_create_link(&per_cpu(device_mce, cpu).kobj,
+					&b->kobj, name);
+		if (err)
+			goto out;
+
+		b->cpus = cpu_core_map[cpu];
+		per_cpu(threshold_banks, cpu)[bank] = b;
+		goto out;
+	}
+#endif
+
+	b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
+	if (!b) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	kobject_set_name(&b->kobj, "threshold_bank%i", bank);
+	b->kobj.parent = &per_cpu(device_mce, cpu).kobj;
+#ifndef CONFIG_SMP
+	b->cpus = CPU_MASK_ALL;
+#else
+	b->cpus = cpu_core_map[cpu];
+#endif
+	err = kobject_register(&b->kobj);
+	if (err)
+		goto out_free;
+
+	per_cpu(threshold_banks, cpu)[bank] = b;
+
+	oldmask = affinity_set(cpu);
+	err = allocate_threshold_blocks(cpu, bank, 0,
+					MSR_IA32_MC0_MISC + bank * 4);
+	affinity_restore(oldmask);
+
+	if (err)
+		goto out_free;
+
+	for_each_cpu_mask(i, b->cpus) {
+		if (i == cpu)
+			continue;
+
+		err = sysfs_create_link(&per_cpu(device_mce, i).kobj,
+					&b->kobj, name);
+		if (err)
+			goto out;
+
+		per_cpu(threshold_banks, i)[bank] = b;
+	}
+
+	goto out;
+
+out_free:
+	per_cpu(threshold_banks, cpu)[bank] = NULL;
+	kfree(b);
+out:
+	return err;
+}
+
+/* create dir/files for all valid threshold banks */
+static __cpuinit int threshold_create_device(unsigned int cpu)
+{
+	unsigned int bank;
+	int err = 0;
+
+	for (bank = 0; bank < NR_BANKS; ++bank) {
+		if (!(per_cpu(bank_map, cpu) & 1 << bank))
+			continue;
+		err = threshold_create_bank(cpu, bank);
+		if (err)
+			goto out;
+	}
+out:
+	return err;
+}
+
+/*
+ * let's be hotplug friendly.
+ * in case of multiple core processors, the first core always takes ownership
+ *   of shared sysfs dir/files, and rest of the cores will be symlinked to it.
+ */
+
+static void deallocate_threshold_block(unsigned int cpu,
+						 unsigned int bank)
+{
+	struct threshold_block *pos = NULL;
+	struct threshold_block *tmp = NULL;
+	struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
+
+	if (!head)
+		return;
+
+	list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
+		kobject_unregister(&pos->kobj);
+		list_del(&pos->miscj);
+		kfree(pos);
+	}
+
+	kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
+	per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
+}
+
+static void threshold_remove_bank(unsigned int cpu, int bank)
+{
+	int i = 0;
+	struct threshold_bank *b;
+	char name[32];
+
+	b = per_cpu(threshold_banks, cpu)[bank];
+
+	if (!b)
+		return;
+
+	if (!b->blocks)
+		goto free_out;
+
+	sprintf(name, "threshold_bank%i", bank);
+
+#ifdef CONFIG_SMP
+	/* sibling symlink */
+	if (shared_bank[bank] && b->blocks->cpu != cpu) {
+		sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
+		per_cpu(threshold_banks, cpu)[bank] = NULL;
+		return;
+	}
+#endif
+
+	/* remove all sibling symlinks before unregistering */
+	for_each_cpu_mask(i, b->cpus) {
+		if (i == cpu)
+			continue;
+
+		sysfs_remove_link(&per_cpu(device_mce, i).kobj, name);
+		per_cpu(threshold_banks, i)[bank] = NULL;
+	}
+
+	deallocate_threshold_block(cpu, bank);
+
+free_out:
+	kobject_unregister(&b->kobj);
+	kfree(b);
+	per_cpu(threshold_banks, cpu)[bank] = NULL;
+}
+
+static void threshold_remove_device(unsigned int cpu)
+{
+	unsigned int bank;
+
+	for (bank = 0; bank < NR_BANKS; ++bank) {
+		if (!(per_cpu(bank_map, cpu) & 1 << bank))
+			continue;
+		threshold_remove_bank(cpu, bank);
+	}
+}
+
+/* get notified when a cpu comes on/off */
+static int threshold_cpu_callback(struct notifier_block *nfb,
+					    unsigned long action, void *hcpu)
+{
+	/* cpu was unsigned int to begin with */
+	unsigned int cpu = (unsigned long)hcpu;
+
+	if (cpu >= NR_CPUS)
+		goto out;
+
+	switch (action) {
+	case CPU_ONLINE:
+	case CPU_ONLINE_FROZEN:
+		threshold_create_device(cpu);
+		break;
+	case CPU_DEAD:
+	case CPU_DEAD_FROZEN:
+		threshold_remove_device(cpu);
+		break;
+	default:
+		break;
+	}
+      out:
+	return NOTIFY_OK;
+}
+
+static struct notifier_block threshold_cpu_notifier = {
+	.notifier_call = threshold_cpu_callback,
+};
+
+static __init int threshold_init_device(void)
+{
+	unsigned lcpu = 0;
+
+	/* to hit CPUs online before the notifier is up */
+	for_each_online_cpu(lcpu) {
+		int err = threshold_create_device(lcpu);
+		if (err)
+			return err;
+	}
+	register_hotcpu_notifier(&threshold_cpu_notifier);
+	return 0;
+}
+
+device_initcall(threshold_init_device);