1 // SPDX-License-Identifier: GPL-2.0 !! 1 /*
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst !! 2 * This file is subject to the terms and conditions of the GNU General Public
3 !! 3 * License. See the file "COPYING" in the main directory of this archive
>> 4 * for more details.
>> 5 *
>> 6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
>> 7 *
>> 8 * Copyright (C) 1992 Linus Torvalds
>> 9 * Copyright (C) 1994 - 2000 Ralf Baechle
>> 10 */
>> 11 #include <linux/kernel.h>
>> 12 #include <linux/delay.h>
4 #include <linux/init.h> 13 #include <linux/init.h>
5 #include <linux/interrupt.h> 14 #include <linux/interrupt.h>
6 #include <linux/irq.h> !! 15 #include <linux/kernel_stat.h>
7 #include <linux/irqchip.h> !! 16 #include <linux/proc_fs.h>
8 #include <asm/traps.h> !! 17 #include <linux/mm.h>
9 #include <asm/smp.h> !! 18 #include <linux/random.h>
>> 19 #include <linux/sched.h>
>> 20 #include <linux/seq_file.h>
>> 21 #include <linux/kallsyms.h>
>> 22 #include <linux/kgdb.h>
>> 23 #include <linux/ftrace.h>
>> 24 #include <linux/irqdomain.h>
>> 25
>> 26 #include <linux/atomic.h>
>> 27 #include <linux/uaccess.h>
>> 28
>> 29 void *irq_stack[NR_CPUS];
>> 30
>> 31 /*
>> 32 * 'what should we do if we get a hw irq event on an illegal vector'.
>> 33 * each architecture has to answer this themselves.
>> 34 */
>> 35 void ack_bad_irq(unsigned int irq)
>> 36 {
>> 37 printk("unexpected IRQ # %d\n", irq);
>> 38 }
>> 39
>> 40 atomic_t irq_err_count;
>> 41
>> 42 int arch_show_interrupts(struct seq_file *p, int prec)
>> 43 {
>> 44 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
>> 45 return 0;
>> 46 }
>> 47
>> 48 asmlinkage void spurious_interrupt(void)
>> 49 {
>> 50 atomic_inc(&irq_err_count);
>> 51 }
10 52
11 void __init init_IRQ(void) 53 void __init init_IRQ(void)
12 { 54 {
13 irqchip_init(); !! 55 int i;
14 #ifdef CONFIG_SMP !! 56 unsigned int order = get_order(IRQ_STACK_SIZE);
15 setup_smp_ipi(); !! 57
>> 58 for (i = 0; i < NR_IRQS; i++)
>> 59 irq_set_noprobe(i);
>> 60
>> 61 if (cpu_has_veic)
>> 62 clear_c0_status(ST0_IM);
>> 63
>> 64 arch_init_irq();
>> 65
>> 66 for_each_possible_cpu(i) {
>> 67 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
>> 68
>> 69 irq_stack[i] = s;
>> 70 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
>> 71 irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
>> 72 }
>> 73 }
>> 74
>> 75 #ifdef CONFIG_DEBUG_STACKOVERFLOW
>> 76 static inline void check_stack_overflow(void)
>> 77 {
>> 78 unsigned long sp;
>> 79
>> 80 __asm__ __volatile__("move %0, $sp" : "=r" (sp));
>> 81 sp &= THREAD_MASK;
>> 82
>> 83 /*
>> 84 * Check for stack overflow: is there less than STACK_WARN free?
>> 85 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
>> 86 */
>> 87 if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
>> 88 printk("do_IRQ: stack overflow: %ld\n",
>> 89 sp - sizeof(struct thread_info));
>> 90 dump_stack();
>> 91 }
>> 92 }
>> 93 #else
>> 94 static inline void check_stack_overflow(void) {}
16 #endif 95 #endif
>> 96
>> 97
>> 98 /*
>> 99 * do_IRQ handles all normal device IRQ's (the special
>> 100 * SMP cross-CPU interrupts have their own specific
>> 101 * handlers).
>> 102 */
>> 103 void __irq_entry do_IRQ(unsigned int irq)
>> 104 {
>> 105 irq_enter();
>> 106 check_stack_overflow();
>> 107 generic_handle_irq(irq);
>> 108 irq_exit();
>> 109 }
>> 110
>> 111 #ifdef CONFIG_IRQ_DOMAIN
>> 112 void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
>> 113 {
>> 114 struct irq_desc *desc;
>> 115
>> 116 irq_enter();
>> 117 check_stack_overflow();
>> 118
>> 119 desc = irq_resolve_mapping(domain, hwirq);
>> 120 if (likely(desc))
>> 121 handle_irq_desc(desc);
>> 122
>> 123 irq_exit();
17 } 124 }
>> 125 #endif
18 126
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