Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/irq.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Linus Torvalds |
| 5 | * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. |
| 6 | * |
Russell King | 8749af6 | 2005-06-25 19:39:45 +0100 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 file contains the code used by various IRQ handling routines: |
| 16 | * asking for different IRQ's should be done through these routines |
| 17 | * instead of just grabbing them. Thus setups with different IRQ numbers |
| 18 | * shouldn't result in any weird surprises, and installing new handlers |
| 19 | * should be easier. |
| 20 | * |
| 21 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. |
| 22 | * Naturally it's not a 1:1 relation, but there are similarities. |
| 23 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/signal.h> |
| 26 | #include <linux/ioport.h> |
| 27 | #include <linux/interrupt.h> |
Thomas Gleixner | 4a2581a | 2006-07-01 22:30:09 +0100 | [diff] [blame] | 28 | #include <linux/irq.h> |
Maxime Ripard | ebafed7 | 2013-03-28 21:46:44 +0100 | [diff] [blame] | 29 | #include <linux/irqchip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/random.h> |
| 31 | #include <linux/smp.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/seq_file.h> |
Russell King | 108900b | 2014-10-28 13:32:35 +0000 | [diff] [blame] | 34 | #include <linux/ratelimit.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/errno.h> |
| 36 | #include <linux/list.h> |
| 37 | #include <linux/kallsyms.h> |
| 38 | #include <linux/proc_fs.h> |
Arnd Bergmann | 05c7698 | 2012-08-16 07:49:26 +0000 | [diff] [blame] | 39 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Russell King | 805604e | 2014-04-28 15:24:10 +0100 | [diff] [blame] | 41 | #include <asm/hardware/cache-l2x0.h> |
Jamie Iles | 5a567d7 | 2011-10-08 11:20:42 +0100 | [diff] [blame] | 42 | #include <asm/exception.h> |
Russell King | 8ff1443 | 2010-12-20 10:18:36 +0000 | [diff] [blame] | 43 | #include <asm/mach/arch.h> |
Russell King | 897d852 | 2008-08-03 15:04:04 +0100 | [diff] [blame] | 44 | #include <asm/mach/irq.h> |
Russell King | 8749af6 | 2005-06-25 19:39:45 +0100 | [diff] [blame] | 45 | #include <asm/mach/time.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Thomas Gleixner | 4a2581a | 2006-07-01 22:30:09 +0100 | [diff] [blame] | 47 | unsigned long irq_err_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Thomas Gleixner | 25a5662 | 2011-03-24 12:02:11 +0100 | [diff] [blame] | 49 | int arch_show_interrupts(struct seq_file *p, int prec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Ben Dooks | baa28e3 | 2009-08-03 15:11:29 +0100 | [diff] [blame] | 51 | #ifdef CONFIG_FIQ |
Thomas Gleixner | 25a5662 | 2011-03-24 12:02:11 +0100 | [diff] [blame] | 52 | show_fiq_list(p, prec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #endif |
| 54 | #ifdef CONFIG_SMP |
Thomas Gleixner | 25a5662 | 2011-03-24 12:02:11 +0100 | [diff] [blame] | 55 | show_ipi_list(p, prec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #endif |
Thomas Gleixner | 25a5662 | 2011-03-24 12:02:11 +0100 | [diff] [blame] | 57 | seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return 0; |
| 59 | } |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | /* |
Russell King - ARM Linux | a4841e3 | 2011-07-11 22:25:43 +0100 | [diff] [blame] | 62 | * handle_IRQ handles all hardware IRQ's. Decoded IRQs should |
| 63 | * not come via this function. Instead, they should provide their |
| 64 | * own 'handler'. Used by platform code implementing C-based 1st |
| 65 | * level decoding. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | */ |
Russell King - ARM Linux | a4841e3 | 2011-07-11 22:25:43 +0100 | [diff] [blame] | 67 | void handle_IRQ(unsigned int irq, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
Marc Zyngier | a71b092 | 2014-08-26 11:03:18 +0100 | [diff] [blame] | 69 | __handle_domain_irq(NULL, irq, false, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Russell King - ARM Linux | a4841e3 | 2011-07-11 22:25:43 +0100 | [diff] [blame] | 72 | /* |
| 73 | * asm_do_IRQ is the interface to be used from assembly code. |
| 74 | */ |
| 75 | asmlinkage void __exception_irq_entry |
| 76 | asm_do_IRQ(unsigned int irq, struct pt_regs *regs) |
| 77 | { |
| 78 | handle_IRQ(irq, regs); |
| 79 | } |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | void set_irq_flags(unsigned int irq, unsigned int iflags) |
| 82 | { |
Thomas Gleixner | 1b7a2d9 | 2011-02-07 22:30:49 +0100 | [diff] [blame] | 83 | unsigned long clr = 0, set = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
eric miao | 354e6f7 | 2010-06-25 09:46:09 +0100 | [diff] [blame] | 85 | if (irq >= nr_irqs) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 86 | pr_err("Trying to set irq flags for IRQ%d\n", irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | return; |
| 88 | } |
| 89 | |
Thomas Gleixner | 4a2581a | 2006-07-01 22:30:09 +0100 | [diff] [blame] | 90 | if (iflags & IRQF_VALID) |
Thomas Gleixner | 1b7a2d9 | 2011-02-07 22:30:49 +0100 | [diff] [blame] | 91 | clr |= IRQ_NOREQUEST; |
Thomas Gleixner | 4a2581a | 2006-07-01 22:30:09 +0100 | [diff] [blame] | 92 | if (iflags & IRQF_PROBE) |
Thomas Gleixner | 1b7a2d9 | 2011-02-07 22:30:49 +0100 | [diff] [blame] | 93 | clr |= IRQ_NOPROBE; |
Thomas Gleixner | 4a2581a | 2006-07-01 22:30:09 +0100 | [diff] [blame] | 94 | if (!(iflags & IRQF_NOAUTOEN)) |
Thomas Gleixner | 1b7a2d9 | 2011-02-07 22:30:49 +0100 | [diff] [blame] | 95 | clr |= IRQ_NOAUTOEN; |
| 96 | /* Order is clear bits in "clr" then set bits in "set" */ |
| 97 | irq_modify_status(irq, clr, set & ~clr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
Arnd Bergmann | 05c7698 | 2012-08-16 07:49:26 +0000 | [diff] [blame] | 99 | EXPORT_SYMBOL_GPL(set_irq_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | void __init init_IRQ(void) |
| 102 | { |
Russell King | 805604e | 2014-04-28 15:24:10 +0100 | [diff] [blame] | 103 | int ret; |
| 104 | |
Maxime Ripard | ebafed7 | 2013-03-28 21:46:44 +0100 | [diff] [blame] | 105 | if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq) |
| 106 | irqchip_init(); |
| 107 | else |
| 108 | machine_desc->init_irq(); |
Russell King | 805604e | 2014-04-28 15:24:10 +0100 | [diff] [blame] | 109 | |
| 110 | if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) && |
| 111 | (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) { |
Tomasz Figa | 0c4c2ed | 2015-01-08 07:51:45 +0100 | [diff] [blame] | 112 | if (!outer_cache.write_sec) |
| 113 | outer_cache.write_sec = machine_desc->l2c_write_sec; |
Russell King | 805604e | 2014-04-28 15:24:10 +0100 | [diff] [blame] | 114 | ret = l2x0_of_init(machine_desc->l2c_aux_val, |
| 115 | machine_desc->l2c_aux_mask); |
| 116 | if (ret) |
| 117 | pr_err("L2C: failed to init: %d\n", ret); |
| 118 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
Thomas Petazzoni | 73171d1 | 2012-11-20 23:00:53 +0100 | [diff] [blame] | 121 | #ifdef CONFIG_MULTI_IRQ_HANDLER |
| 122 | void __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) |
| 123 | { |
| 124 | if (handle_arch_irq) |
| 125 | return; |
| 126 | |
| 127 | handle_arch_irq = handle_irq; |
| 128 | } |
| 129 | #endif |
| 130 | |
eric miao | 354e6f7 | 2010-06-25 09:46:09 +0100 | [diff] [blame] | 131 | #ifdef CONFIG_SPARSE_IRQ |
| 132 | int __init arch_probe_nr_irqs(void) |
| 133 | { |
Russell King | 8ff1443 | 2010-12-20 10:18:36 +0000 | [diff] [blame] | 134 | nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS; |
Thomas Gleixner | b683de2 | 2010-09-27 20:55:03 +0200 | [diff] [blame] | 135 | return nr_irqs; |
eric miao | 354e6f7 | 2010-06-25 09:46:09 +0100 | [diff] [blame] | 136 | } |
| 137 | #endif |
| 138 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 139 | #ifdef CONFIG_HOTPLUG_CPU |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 140 | static bool migrate_one_irq(struct irq_desc *desc) |
Thomas Gleixner | f7ede37 | 2006-07-11 22:54:34 +0100 | [diff] [blame] | 141 | { |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 142 | struct irq_data *d = irq_desc_get_irq_data(desc); |
Russell King | ca15af1 | 2011-07-21 15:07:56 +0100 | [diff] [blame] | 143 | const struct cpumask *affinity = d->affinity; |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 144 | struct irq_chip *c; |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 145 | bool ret = false; |
Thomas Gleixner | f7ede37 | 2006-07-11 22:54:34 +0100 | [diff] [blame] | 146 | |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 147 | /* |
| 148 | * If this is a per-CPU interrupt, or the affinity does not |
| 149 | * include this CPU, then we have nothing to do. |
| 150 | */ |
| 151 | if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity)) |
| 152 | return false; |
| 153 | |
Russell King | ca15af1 | 2011-07-21 15:07:56 +0100 | [diff] [blame] | 154 | if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 155 | affinity = cpu_online_mask; |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 156 | ret = true; |
| 157 | } |
| 158 | |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 159 | c = irq_data_get_irq_chip(d); |
Will Deacon | 5e7371d | 2012-04-27 12:56:24 +0100 | [diff] [blame] | 160 | if (!c->irq_set_affinity) |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 161 | pr_debug("IRQ%u: unable to set affinity\n", d->irq); |
Sudeep Holla | a040803 | 2014-09-01 17:14:29 +0100 | [diff] [blame] | 162 | else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret) |
Will Deacon | 5e7371d | 2012-04-27 12:56:24 +0100 | [diff] [blame] | 163 | cpumask_copy(d->affinity, affinity); |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 164 | |
| 165 | return ret; |
Thomas Gleixner | f7ede37 | 2006-07-11 22:54:34 +0100 | [diff] [blame] | 166 | } |
| 167 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 168 | /* |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 169 | * The current CPU has been marked offline. Migrate IRQs off this CPU. |
| 170 | * If the affinity settings do not allow other CPUs, force them onto any |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 171 | * available CPU. |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 172 | * |
| 173 | * Note: we must iterate over all IRQs, whether they have an attached |
| 174 | * action structure or not, as we need to get chained interrupts too. |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 175 | */ |
| 176 | void migrate_irqs(void) |
| 177 | { |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 178 | unsigned int i; |
eric miao | 354e6f7 | 2010-06-25 09:46:09 +0100 | [diff] [blame] | 179 | struct irq_desc *desc; |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 180 | unsigned long flags; |
| 181 | |
| 182 | local_irq_save(flags); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 183 | |
eric miao | 354e6f7 | 2010-06-25 09:46:09 +0100 | [diff] [blame] | 184 | for_each_irq_desc(i, desc) { |
Will Deacon | 342d00a | 2012-02-03 14:50:07 +0100 | [diff] [blame] | 185 | bool affinity_broken; |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 186 | |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 187 | raw_spin_lock(&desc->lock); |
Russell King | 78359cb | 2011-07-21 15:14:21 +0100 | [diff] [blame] | 188 | affinity_broken = migrate_one_irq(desc); |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 189 | raw_spin_unlock(&desc->lock); |
| 190 | |
Russell King | 108900b | 2014-10-28 13:32:35 +0000 | [diff] [blame] | 191 | if (affinity_broken) |
| 192 | pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n", |
Joe Perches | 8b521cb | 2014-09-16 20:41:43 +0100 | [diff] [blame] | 193 | i, smp_processor_id()); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 194 | } |
Russell King | 6179124 | 2011-01-23 12:09:36 +0000 | [diff] [blame] | 195 | |
| 196 | local_irq_restore(flags); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 197 | } |
| 198 | #endif /* CONFIG_HOTPLUG_CPU */ |