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182 lines
4.8 KiB
182 lines
4.8 KiB
/* |
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* linux/arch/arm/kernel/irq.c |
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* |
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* Copyright (C) 1992 Linus Torvalds |
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King. |
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* |
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* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. |
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* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and |
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* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This file contains the code used by various IRQ handling routines: |
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* asking for different IRQ's should be done through these routines |
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* instead of just grabbing them. Thus setups with different IRQ numbers |
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* shouldn't result in any weird surprises, and installing new handlers |
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* should be easier. |
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* |
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* IRQ's are in fact implemented a bit like signal handlers for the kernel. |
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* Naturally it's not a 1:1 relation, but there are similarities. |
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*/ |
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#include <linux/kernel_stat.h> |
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#include <linux/signal.h> |
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#include <linux/ioport.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/irqchip.h> |
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#include <linux/random.h> |
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#include <linux/smp.h> |
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#include <linux/init.h> |
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#include <linux/seq_file.h> |
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#include <linux/ratelimit.h> |
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#include <linux/errno.h> |
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#include <linux/list.h> |
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#include <linux/kallsyms.h> |
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#include <linux/proc_fs.h> |
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#include <linux/export.h> |
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#include <asm/hardware/cache-l2x0.h> |
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#include <asm/hardware/cache-uniphier.h> |
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#include <asm/outercache.h> |
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#include <asm/exception.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/irq.h> |
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#include <asm/mach/time.h> |
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unsigned long irq_err_count; |
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int arch_show_interrupts(struct seq_file *p, int prec) |
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{ |
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#ifdef CONFIG_FIQ |
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show_fiq_list(p, prec); |
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#endif |
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#ifdef CONFIG_SMP |
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show_ipi_list(p, prec); |
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#endif |
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seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); |
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return 0; |
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} |
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/* |
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* handle_IRQ handles all hardware IRQ's. Decoded IRQs should |
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* not come via this function. Instead, they should provide their |
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* own 'handler'. Used by platform code implementing C-based 1st |
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* level decoding. |
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*/ |
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void handle_IRQ(unsigned int irq, struct pt_regs *regs) |
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{ |
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__handle_domain_irq(NULL, irq, false, regs); |
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} |
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/* |
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* asm_do_IRQ is the interface to be used from assembly code. |
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*/ |
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asmlinkage void __exception_irq_entry |
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asm_do_IRQ(unsigned int irq, struct pt_regs *regs) |
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{ |
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handle_IRQ(irq, regs); |
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} |
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void __init init_IRQ(void) |
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{ |
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int ret; |
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if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq) |
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irqchip_init(); |
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else |
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machine_desc->init_irq(); |
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if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) && |
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(machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) { |
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if (!outer_cache.write_sec) |
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outer_cache.write_sec = machine_desc->l2c_write_sec; |
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ret = l2x0_of_init(machine_desc->l2c_aux_val, |
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machine_desc->l2c_aux_mask); |
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if (ret) |
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pr_err("L2C: failed to init: %d\n", ret); |
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} |
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uniphier_cache_init(); |
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} |
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#ifdef CONFIG_MULTI_IRQ_HANDLER |
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void __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) |
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{ |
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if (handle_arch_irq) |
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return; |
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handle_arch_irq = handle_irq; |
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} |
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#endif |
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#ifdef CONFIG_SPARSE_IRQ |
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int __init arch_probe_nr_irqs(void) |
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{ |
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nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS; |
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return nr_irqs; |
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} |
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#endif |
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#ifdef CONFIG_HOTPLUG_CPU |
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static bool migrate_one_irq(struct irq_desc *desc) |
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{ |
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struct irq_data *d = irq_desc_get_irq_data(desc); |
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const struct cpumask *affinity = irq_data_get_affinity_mask(d); |
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struct irq_chip *c; |
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bool ret = false; |
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/* |
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* If this is a per-CPU interrupt, or the affinity does not |
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* include this CPU, then we have nothing to do. |
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*/ |
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if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity)) |
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return false; |
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if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { |
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affinity = cpu_online_mask; |
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ret = true; |
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} |
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c = irq_data_get_irq_chip(d); |
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if (!c->irq_set_affinity) |
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pr_debug("IRQ%u: unable to set affinity\n", d->irq); |
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else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret) |
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cpumask_copy(irq_data_get_affinity_mask(d), affinity); |
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return ret; |
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} |
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/* |
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* The current CPU has been marked offline. Migrate IRQs off this CPU. |
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* If the affinity settings do not allow other CPUs, force them onto any |
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* available CPU. |
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* |
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* Note: we must iterate over all IRQs, whether they have an attached |
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* action structure or not, as we need to get chained interrupts too. |
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*/ |
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void migrate_irqs(void) |
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{ |
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unsigned int i; |
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struct irq_desc *desc; |
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unsigned long flags; |
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local_irq_save(flags); |
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for_each_irq_desc(i, desc) { |
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bool affinity_broken; |
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raw_spin_lock(&desc->lock); |
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affinity_broken = migrate_one_irq(desc); |
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raw_spin_unlock(&desc->lock); |
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if (affinity_broken) |
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pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n", |
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i, smp_processor_id()); |
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} |
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local_irq_restore(flags); |
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} |
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#endif /* CONFIG_HOTPLUG_CPU */
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