LXR linux/arch/arm64/kernel/irq.c

   1/*
   2 * Based on arch/arm/kernel/irq.c
   3 *
   4 * Copyright (C) 1992 Linus Torvalds
   5 * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
   6 * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
   7 * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
   8 * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
   9 * Copyright (C) 2012 ARM Ltd.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24#include <linux/kernel_stat.h>
  25#include <linux/irq.h>
  26#include <linux/memory.h>
  27#include <linux/smp.h>
  28#include <linux/init.h>
  29#include <linux/irqchip.h>
  30#include <linux/seq_file.h>
  31#include <linux/vmalloc.h>
  32#include <asm/vmap_stack.h>
  33
  34unsigned long irq_err_count;
  35
  36DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
  37
  38int arch_show_interrupts(struct seq_file *p, int prec)
  39{
  40        show_ipi_list(p, prec);
  41        seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
  42        return 0;
  43}
  44
  45void (*handle_arch_irq)(struct pt_regs *) = NULL;
  46
  47void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
  48{
  49        if (handle_arch_irq)
  50                return;
  51
  52        handle_arch_irq = handle_irq;
  53}
  54
  55#ifdef CONFIG_VMAP_STACK
  56static void init_irq_stacks(void)
  57{
  58        int cpu;
  59        unsigned long *p;
  60
  61        for_each_possible_cpu(cpu) {
  62                p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
  63                per_cpu(irq_stack_ptr, cpu) = p;
  64        }
  65}
  66#else
  67/* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
  68DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
  69
  70static void init_irq_stacks(void)
  71{
  72        int cpu;
  73
  74        for_each_possible_cpu(cpu)
  75                per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
  76}
  77#endif
  78
  79void __init init_IRQ(void)
  80{
  81        init_irq_stacks();
  82        irqchip_init();
  83        if (!handle_arch_irq)
  84                panic("No interrupt controller found.");
  85}
  86