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

Source file repositories/reference/linux-study-clean/arch/x86/kernel/cpu/mce/threshold.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/cpu/mce/threshold.c
Extension
.c
Size
4325 bytes
Lines
164
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Common corrected MCE threshold handler code:
 */
#include <linux/interrupt.h>
#include <linux/kernel.h>

#include <asm/irq_vectors.h>
#include <asm/traps.h>
#include <asm/apic.h>
#include <asm/mce.h>
#include <asm/trace/irq_vectors.h>

#include "internal.h"

static u32 mce_apei_thr_limit;

void mce_save_apei_thr_limit(u32 thr_limit)
{
	mce_apei_thr_limit = thr_limit;
	pr_info("HEST corrected error threshold limit: %u\n", thr_limit);
}

u32 mce_get_apei_thr_limit(void)
{
	return mce_apei_thr_limit;
}

static void default_threshold_interrupt(void)
{
	pr_err("Unexpected threshold interrupt at vector %x\n",
		THRESHOLD_APIC_VECTOR);
}

void (*mce_threshold_vector)(void) = default_threshold_interrupt;

DEFINE_IDTENTRY_SYSVEC(sysvec_threshold)
{
	trace_threshold_apic_entry(THRESHOLD_APIC_VECTOR);
	inc_irq_stat(THRESHOLD_APIC);
	mce_threshold_vector();
	trace_threshold_apic_exit(THRESHOLD_APIC_VECTOR);
	apic_eoi();
}

DEFINE_PER_CPU(struct mca_storm_desc, storm_desc);

void mce_inherit_storm(unsigned int bank)
{
	struct mca_storm_desc *storm = this_cpu_ptr(&storm_desc);

	/*
	 * Previous CPU owning this bank had put it into storm mode,
	 * but the precise history of that storm is unknown. Assume
	 * the worst (all recent polls of the bank found a valid error
	 * logged). This will avoid the new owner prematurely declaring
	 * the storm has ended.
	 */
	storm->banks[bank].history = ~0ull;
	storm->banks[bank].timestamp = jiffies;
}

bool mce_get_storm_mode(void)
{
	return __this_cpu_read(storm_desc.poll_mode);
}

void mce_set_storm_mode(bool storm)
{
	__this_cpu_write(storm_desc.poll_mode, storm);
}

static void mce_handle_storm(unsigned int bank, bool on)
{
	switch (boot_cpu_data.x86_vendor) {
	case X86_VENDOR_INTEL:
		mce_intel_handle_storm(bank, on);
		break;
	case X86_VENDOR_AMD:
		mce_amd_handle_storm(bank, on);
		break;
	}
}

void cmci_storm_begin(unsigned int bank)
{
	struct mca_storm_desc *storm = this_cpu_ptr(&storm_desc);

	__set_bit(bank, this_cpu_ptr(mce_poll_banks));
	storm->banks[bank].in_storm_mode = true;

Annotation

Implementation Notes