arch/loongarch/kernel/irq.c

Source file repositories/reference/linux-study-clean/arch/loongarch/kernel/irq.c

File Facts

System
Linux kernel
Corpus path
arch/loongarch/kernel/irq.c
Extension
.c
Size
3142 bytes
Lines
133
Domain
Architecture Layer
Bucket
arch/loongarch
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
/*
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/minmax.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/uaccess.h>

#include <asm/irq.h>
#include <asm/loongson.h>
#include <asm/setup.h>

DEFINE_PER_CPU(unsigned long, irq_stack);
DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
EXPORT_PER_CPU_SYMBOL(irq_stat);

struct acpi_vector_group pch_group[MAX_IO_PICS];
struct acpi_vector_group msi_group[MAX_IO_PICS];
/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
	pr_warn("Unexpected IRQ # %d\n", irq);
}

atomic_t irq_err_count;

asmlinkage void spurious_interrupt(void)
{
	atomic_inc(&irq_err_count);
}

int arch_show_interrupts(struct seq_file *p, int prec)
{
#ifdef CONFIG_SMP
	show_ipi_list(p, prec);
#endif
	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
	return 0;
}

static int __init early_pci_mcfg_parse(struct acpi_table_header *header)
{
	struct acpi_table_mcfg *mcfg;
	struct acpi_mcfg_allocation *mptr;
	int i, n;

	if (header->length < sizeof(struct acpi_table_mcfg))
		return -EINVAL;

	n = (header->length - sizeof(struct acpi_table_mcfg)) /
					sizeof(struct acpi_mcfg_allocation);
	mcfg = (struct acpi_table_mcfg *)header;
	mptr = (struct acpi_mcfg_allocation *) &mcfg[1];

	for (i = 0; i < n; i++, mptr++) {
		msi_group[i].pci_segment = mptr->pci_segment;
		pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf;
	}

	return 0;
}

static void __init init_vec_parent_group(void)
{
	int i;

	for (i = 0; i < MAX_IO_PICS; i++) {
		msi_group[i].pci_segment = -1;
		msi_group[i].node = -1;
		pch_group[i].node = -1;
	}

	acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse);
}

Annotation

Implementation Notes