2005-11-05 09:25:53 -07:00
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/*
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* (c) 2005 Advanced Micro Devices, Inc.
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* Your use of this code is subject to the terms and conditions of the
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*
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* Written by Jacob Shin - AMD, Inc.
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*
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* Support : jacob.shin@amd.com
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*
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* MC4_MISC0 DRAM ECC Error Threshold available under AMD K8 Rev F.
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* MC4_MISC0 exists per physical processor.
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*
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*/
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kobject.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/sysdev.h>
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#include <linux/sysfs.h>
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#include <asm/apic.h>
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#include <asm/mce.h>
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#include <asm/msr.h>
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#include <asm/percpu.h>
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2006-01-11 14:44:36 -07:00
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#include <asm/idle.h>
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2005-11-05 09:25:53 -07:00
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#define PFX "mce_threshold: "
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2006-06-26 05:58:50 -06:00
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#define VERSION "version 1.0.10"
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2005-11-05 09:25:53 -07:00
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#define NR_BANKS 5
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#define THRESHOLD_MAX 0xFFF
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#define INT_TYPE_APIC 0x00020000
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#define MASK_VALID_HI 0x80000000
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#define MASK_LVTOFF_HI 0x00F00000
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#define MASK_COUNT_EN_HI 0x00080000
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#define MASK_INT_TYPE_HI 0x00060000
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#define MASK_OVERFLOW_HI 0x00010000
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#define MASK_ERR_COUNT_HI 0x00000FFF
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#define MASK_OVERFLOW 0x0001000000000000L
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struct threshold_bank {
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unsigned int cpu;
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u8 bank;
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u8 interrupt_enable;
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u16 threshold_limit;
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struct kobject kobj;
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};
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static struct threshold_bank threshold_defaults = {
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.interrupt_enable = 0,
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.threshold_limit = THRESHOLD_MAX,
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};
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#ifdef CONFIG_SMP
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static unsigned char shared_bank[NR_BANKS] = {
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0, 0, 0, 0, 1
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};
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#endif
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static DEFINE_PER_CPU(unsigned char, bank_map); /* see which banks are on */
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/*
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* CPU Initialization
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*/
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/* must be called with correct cpu affinity */
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static void threshold_restart_bank(struct threshold_bank *b,
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int reset, u16 old_limit)
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{
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u32 mci_misc_hi, mci_misc_lo;
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rdmsr(MSR_IA32_MC0_MISC + b->bank * 4, mci_misc_lo, mci_misc_hi);
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if (b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
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reset = 1; /* limit cannot be lower than err count */
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if (reset) { /* reset err count and overflow bit */
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mci_misc_hi =
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(mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
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(THRESHOLD_MAX - b->threshold_limit);
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} else if (old_limit) { /* change limit w/o reset */
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int new_count = (mci_misc_hi & THRESHOLD_MAX) +
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(old_limit - b->threshold_limit);
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mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
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(new_count & THRESHOLD_MAX);
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}
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b->interrupt_enable ?
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(mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
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(mci_misc_hi &= ~MASK_INT_TYPE_HI);
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mci_misc_hi |= MASK_COUNT_EN_HI;
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wrmsr(MSR_IA32_MC0_MISC + b->bank * 4, mci_misc_lo, mci_misc_hi);
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}
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void __cpuinit mce_amd_feature_init(struct cpuinfo_x86 *c)
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{
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int bank;
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u32 mci_misc_lo, mci_misc_hi;
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unsigned int cpu = smp_processor_id();
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for (bank = 0; bank < NR_BANKS; ++bank) {
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rdmsr(MSR_IA32_MC0_MISC + bank * 4, mci_misc_lo, mci_misc_hi);
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/* !valid, !counter present, bios locked */
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if (!(mci_misc_hi & MASK_VALID_HI) ||
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!(mci_misc_hi & MASK_VALID_HI >> 1) ||
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(mci_misc_hi & MASK_VALID_HI >> 2))
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continue;
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per_cpu(bank_map, cpu) |= (1 << bank);
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#ifdef CONFIG_SMP
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2006-06-26 05:58:17 -06:00
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if (shared_bank[bank] && c->cpu_core_id)
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2005-11-05 09:25:53 -07:00
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continue;
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#endif
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setup_threshold_lvt((mci_misc_hi & MASK_LVTOFF_HI) >> 20);
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threshold_defaults.cpu = cpu;
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threshold_defaults.bank = bank;
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threshold_restart_bank(&threshold_defaults, 0, 0);
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}
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}
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/*
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* APIC Interrupt Handler
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*/
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/*
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* threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
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* the interrupt goes off when error_count reaches threshold_limit.
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* the handler will simply log mcelog w/ software defined bank number.
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*/
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asmlinkage void mce_threshold_interrupt(void)
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{
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int bank;
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struct mce m;
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ack_APIC_irq();
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2006-01-11 14:44:36 -07:00
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exit_idle();
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2005-11-05 09:25:53 -07:00
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irq_enter();
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memset(&m, 0, sizeof(m));
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rdtscll(m.tsc);
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m.cpu = smp_processor_id();
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/* assume first bank caused it */
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for (bank = 0; bank < NR_BANKS; ++bank) {
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m.bank = MCE_THRESHOLD_BASE + bank;
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rdmsrl(MSR_IA32_MC0_MISC + bank * 4, m.misc);
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if (m.misc & MASK_OVERFLOW) {
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mce_log(&m);
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goto out;
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}
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}
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out:
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irq_exit();
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}
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/*
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* Sysfs Interface
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*/
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struct threshold_attr {
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struct attribute attr;
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ssize_t(*show) (struct threshold_bank *, char *);
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ssize_t(*store) (struct threshold_bank *, const char *, size_t count);
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};
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static DEFINE_PER_CPU(struct threshold_bank *, threshold_banks[NR_BANKS]);
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static cpumask_t affinity_set(unsigned int cpu)
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{
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cpumask_t oldmask = current->cpus_allowed;
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cpumask_t newmask = CPU_MASK_NONE;
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cpu_set(cpu, newmask);
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set_cpus_allowed(current, newmask);
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return oldmask;
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}
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static void affinity_restore(cpumask_t oldmask)
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{
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set_cpus_allowed(current, oldmask);
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}
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#define SHOW_FIELDS(name) \
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static ssize_t show_ ## name(struct threshold_bank * b, char *buf) \
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{ \
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return sprintf(buf, "%lx\n", (unsigned long) b->name); \
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}
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SHOW_FIELDS(interrupt_enable)
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SHOW_FIELDS(threshold_limit)
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static ssize_t store_interrupt_enable(struct threshold_bank *b,
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const char *buf, size_t count)
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{
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char *end;
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cpumask_t oldmask;
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unsigned long new = simple_strtoul(buf, &end, 0);
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if (end == buf)
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return -EINVAL;
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b->interrupt_enable = !!new;
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oldmask = affinity_set(b->cpu);
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threshold_restart_bank(b, 0, 0);
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affinity_restore(oldmask);
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return end - buf;
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}
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static ssize_t store_threshold_limit(struct threshold_bank *b,
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const char *buf, size_t count)
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{
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char *end;
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cpumask_t oldmask;
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u16 old;
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unsigned long new = simple_strtoul(buf, &end, 0);
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if (end == buf)
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return -EINVAL;
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if (new > THRESHOLD_MAX)
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new = THRESHOLD_MAX;
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if (new < 1)
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new = 1;
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old = b->threshold_limit;
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b->threshold_limit = new;
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oldmask = affinity_set(b->cpu);
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threshold_restart_bank(b, 0, old);
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affinity_restore(oldmask);
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return end - buf;
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}
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static ssize_t show_error_count(struct threshold_bank *b, char *buf)
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{
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u32 high, low;
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cpumask_t oldmask;
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oldmask = affinity_set(b->cpu);
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rdmsr(MSR_IA32_MC0_MISC + b->bank * 4, low, high); /* ignore low 32 */
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affinity_restore(oldmask);
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return sprintf(buf, "%x\n",
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(high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit));
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}
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static ssize_t store_error_count(struct threshold_bank *b,
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const char *buf, size_t count)
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{
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cpumask_t oldmask;
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oldmask = affinity_set(b->cpu);
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threshold_restart_bank(b, 1, 0);
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affinity_restore(oldmask);
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return 1;
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}
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#define THRESHOLD_ATTR(_name,_mode,_show,_store) { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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};
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#define ATTR_FIELDS(name) \
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static struct threshold_attr name = \
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THRESHOLD_ATTR(name, 0644, show_## name, store_## name)
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ATTR_FIELDS(interrupt_enable);
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ATTR_FIELDS(threshold_limit);
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ATTR_FIELDS(error_count);
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static struct attribute *default_attrs[] = {
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&interrupt_enable.attr,
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&threshold_limit.attr,
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&error_count.attr,
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NULL
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};
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#define to_bank(k) container_of(k,struct threshold_bank,kobj)
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#define to_attr(a) container_of(a,struct threshold_attr,attr)
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static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
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{
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struct threshold_bank *b = to_bank(kobj);
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struct threshold_attr *a = to_attr(attr);
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ssize_t ret;
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ret = a->show ? a->show(b, buf) : -EIO;
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return ret;
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}
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static ssize_t store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct threshold_bank *b = to_bank(kobj);
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struct threshold_attr *a = to_attr(attr);
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ssize_t ret;
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ret = a->store ? a->store(b, buf, count) : -EIO;
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return ret;
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}
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static struct sysfs_ops threshold_ops = {
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.show = show,
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.store = store,
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};
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static struct kobj_type threshold_ktype = {
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.sysfs_ops = &threshold_ops,
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.default_attrs = default_attrs,
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};
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/* symlinks sibling shared banks to first core. first core owns dir/files. */
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static __cpuinit int threshold_create_bank(unsigned int cpu, int bank)
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{
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int err = 0;
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2006-01-11 14:45:57 -07:00
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struct threshold_bank *b = NULL;
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2005-11-05 09:25:53 -07:00
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#ifdef CONFIG_SMP
|
2006-06-26 05:58:17 -06:00
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if (cpu_data[cpu].cpu_core_id && shared_bank[bank]) { /* symlink */
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2005-11-05 09:25:53 -07:00
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char name[16];
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unsigned lcpu = first_cpu(cpu_core_map[cpu]);
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2006-06-26 05:58:17 -06:00
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if (cpu_data[lcpu].cpu_core_id)
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2005-11-05 09:25:53 -07:00
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goto out; /* first core not up yet */
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b = per_cpu(threshold_banks, lcpu)[bank];
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if (!b)
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goto out;
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2006-06-26 05:58:50 -06:00
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sprintf(name, "threshold_bank%i", bank);
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err = sysfs_create_link(&per_cpu(device_mce, cpu).kobj,
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2005-11-05 09:25:53 -07:00
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&b->kobj, name);
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if (err)
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goto out;
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per_cpu(threshold_banks, cpu)[bank] = b;
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goto out;
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}
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#endif
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b = kmalloc(sizeof(struct threshold_bank), GFP_KERNEL);
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if (!b) {
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err = -ENOMEM;
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goto out;
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}
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memset(b, 0, sizeof(struct threshold_bank));
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b->cpu = cpu;
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b->bank = bank;
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b->interrupt_enable = 0;
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b->threshold_limit = THRESHOLD_MAX;
|
2006-06-26 05:58:50 -06:00
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kobject_set_name(&b->kobj, "threshold_bank%i", bank);
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b->kobj.parent = &per_cpu(device_mce, cpu).kobj;
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2005-11-05 09:25:53 -07:00
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b->kobj.ktype = &threshold_ktype;
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err = kobject_register(&b->kobj);
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if (err) {
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kfree(b);
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goto out;
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}
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per_cpu(threshold_banks, cpu)[bank] = b;
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|
out:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* create dir/files for all valid threshold banks */
|
|
|
|
static __cpuinit int threshold_create_device(unsigned int cpu)
|
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* cpu hotplug call removes all symlinks before first core dies */
|
|
|
|
static __cpuinit void threshold_remove_bank(unsigned int cpu, int bank)
|
|
|
|
{
|
|
|
|
struct threshold_bank *b;
|
|
|
|
char name[16];
|
|
|
|
|
|
|
|
b = per_cpu(threshold_banks, cpu)[bank];
|
|
|
|
if (!b)
|
|
|
|
return;
|
|
|
|
if (shared_bank[bank] && atomic_read(&b->kobj.kref.refcount) > 2) {
|
2006-06-26 05:58:50 -06:00
|
|
|
sprintf(name, "threshold_bank%i", bank);
|
|
|
|
sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
|
2006-01-11 14:45:57 -07:00
|
|
|
per_cpu(threshold_banks, cpu)[bank] = NULL;
|
2005-11-05 09:25:53 -07:00
|
|
|
} else {
|
|
|
|
kobject_unregister(&b->kobj);
|
|
|
|
kfree(per_cpu(threshold_banks, cpu)[bank]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static __cpuinit void threshold_remove_device(unsigned int cpu)
|
|
|
|
{
|
|
|
|
int bank;
|
|
|
|
|
|
|
|
for (bank = 0; bank < NR_BANKS; ++bank) {
|
|
|
|
if (!(per_cpu(bank_map, cpu) & 1 << bank))
|
|
|
|
continue;
|
|
|
|
threshold_remove_bank(cpu, bank);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* link all existing siblings when first core comes up */
|
|
|
|
static __cpuinit int threshold_create_symlinks(unsigned int cpu)
|
|
|
|
{
|
|
|
|
int bank, err = 0;
|
|
|
|
unsigned int lcpu = 0;
|
|
|
|
|
2006-06-26 05:58:17 -06:00
|
|
|
if (cpu_data[cpu].cpu_core_id)
|
2005-11-05 09:25:53 -07:00
|
|
|
return 0;
|
|
|
|
for_each_cpu_mask(lcpu, cpu_core_map[cpu]) {
|
|
|
|
if (lcpu == cpu)
|
|
|
|
continue;
|
|
|
|
for (bank = 0; bank < NR_BANKS; ++bank) {
|
|
|
|
if (!(per_cpu(bank_map, cpu) & 1 << bank))
|
|
|
|
continue;
|
|
|
|
if (!shared_bank[bank])
|
|
|
|
continue;
|
|
|
|
err = threshold_create_bank(lcpu, bank);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* remove all symlinks before first core dies. */
|
|
|
|
static __cpuinit void threshold_remove_symlinks(unsigned int cpu)
|
|
|
|
{
|
|
|
|
int bank;
|
|
|
|
unsigned int lcpu = 0;
|
2006-06-26 05:58:17 -06:00
|
|
|
if (cpu_data[cpu].cpu_core_id)
|
2005-11-05 09:25:53 -07:00
|
|
|
return;
|
|
|
|
for_each_cpu_mask(lcpu, cpu_core_map[cpu]) {
|
|
|
|
if (lcpu == cpu)
|
|
|
|
continue;
|
|
|
|
for (bank = 0; bank < NR_BANKS; ++bank) {
|
|
|
|
if (!(per_cpu(bank_map, cpu) & 1 << bank))
|
|
|
|
continue;
|
|
|
|
if (!shared_bank[bank])
|
|
|
|
continue;
|
|
|
|
threshold_remove_bank(lcpu, bank);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#else /* !CONFIG_HOTPLUG_CPU */
|
|
|
|
static __cpuinit void threshold_create_symlinks(unsigned int cpu)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
static __cpuinit void threshold_remove_symlinks(unsigned int cpu)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
static void threshold_remove_device(unsigned int cpu)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* get notified when a cpu comes on/off */
|
2006-04-24 20:35:21 -06:00
|
|
|
static int threshold_cpu_callback(struct notifier_block *nfb,
|
2005-11-05 09:25:53 -07:00
|
|
|
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:
|
|
|
|
threshold_create_device(cpu);
|
|
|
|
threshold_create_symlinks(cpu);
|
|
|
|
break;
|
|
|
|
case CPU_DOWN_PREPARE:
|
|
|
|
threshold_remove_symlinks(cpu);
|
|
|
|
break;
|
|
|
|
case CPU_DOWN_FAILED:
|
|
|
|
threshold_create_symlinks(cpu);
|
|
|
|
break;
|
|
|
|
case CPU_DEAD:
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
int lcpu = 0;
|
|
|
|
|
|
|
|
/* to hit CPUs online before the notifier is up */
|
|
|
|
for_each_online_cpu(lcpu) {
|
2006-06-26 05:58:50 -06:00
|
|
|
int err = threshold_create_device(lcpu);
|
2005-11-05 09:25:53 -07:00
|
|
|
if (err)
|
2006-06-26 05:58:50 -06:00
|
|
|
return err;
|
2005-11-05 09:25:53 -07:00
|
|
|
}
|
|
|
|
register_cpu_notifier(&threshold_cpu_notifier);
|
2006-06-26 05:58:50 -06:00
|
|
|
return 0;
|
2005-11-05 09:25:53 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
device_initcall(threshold_init_device);
|