1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Based on arch/arm/kernel/irq.c 4 * 5 * Copyright (C) 1992 Linus Torvalds 6 * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. 7 * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. 8 * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and 9 * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. 10 * Copyright (C) 2012 ARM Ltd. 11 */ 12 13 #include <linux/kernel_stat.h> 14 #include <linux/irq.h> 15 #include <linux/memory.h> 16 #include <linux/smp.h> 17 #include <linux/init.h> 18 #include <linux/irqchip.h> 19 #include <linux/seq_file.h> 20 #include <linux/vmalloc.h> 21 #include <asm/vmap_stack.h> 22 23 unsigned long irq_err_count; 24 25 /* Only access this in an NMI enter/exit */ 26 DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts); 27 28 DEFINE_PER_CPU(unsigned long *, irq_stack_ptr); 29 30 int arch_show_interrupts(struct seq_file *p, int prec) 31 { 32 show_ipi_list(p, prec); 33 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); 34 return 0; 35 } 36 37 #ifdef CONFIG_VMAP_STACK 38 static void init_irq_stacks(void) 39 { 40 int cpu; 41 unsigned long *p; 42 43 for_each_possible_cpu(cpu) { 44 p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu)); 45 per_cpu(irq_stack_ptr, cpu) = p; 46 } 47 } 48 #else 49 /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */ 50 DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack); 51 52 static void init_irq_stacks(void) 53 { 54 int cpu; 55 56 for_each_possible_cpu(cpu) 57 per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu); 58 } 59 #endif 60 61 void __init init_IRQ(void) 62 { 63 init_irq_stacks(); 64 irqchip_init(); 65 if (!handle_arch_irq) 66 panic("No interrupt controller found."); 67 } 68