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Linux/arch/arm/kernel/irq.c

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  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  *
  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  *
 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  */
 24 #include <linux/kernel_stat.h>
 25 #include <linux/signal.h>
 26 #include <linux/ioport.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/irq.h>
 29 #include <linux/irqchip.h>
 30 #include <linux/random.h>
 31 #include <linux/smp.h>
 32 #include <linux/init.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/errno.h>
 35 #include <linux/list.h>
 36 #include <linux/kallsyms.h>
 37 #include <linux/proc_fs.h>
 38 #include <linux/export.h>
 39 
 40 #include <asm/hardware/cache-l2x0.h>
 41 #include <asm/exception.h>
 42 #include <asm/mach/arch.h>
 43 #include <asm/mach/irq.h>
 44 #include <asm/mach/time.h>
 45 
 46 unsigned long irq_err_count;
 47 
 48 int arch_show_interrupts(struct seq_file *p, int prec)
 49 {
 50 #ifdef CONFIG_FIQ
 51         show_fiq_list(p, prec);
 52 #endif
 53 #ifdef CONFIG_SMP
 54         show_ipi_list(p, prec);
 55 #endif
 56         seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
 57         return 0;
 58 }
 59 
 60 /*
 61  * handle_IRQ handles all hardware IRQ's.  Decoded IRQs should
 62  * not come via this function.  Instead, they should provide their
 63  * own 'handler'.  Used by platform code implementing C-based 1st
 64  * level decoding.
 65  */
 66 void handle_IRQ(unsigned int irq, struct pt_regs *regs)
 67 {
 68         __handle_domain_irq(NULL, irq, false, regs);
 69 }
 70 
 71 /*
 72  * asm_do_IRQ is the interface to be used from assembly code.
 73  */
 74 asmlinkage void __exception_irq_entry
 75 asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 76 {
 77         handle_IRQ(irq, regs);
 78 }
 79 
 80 void set_irq_flags(unsigned int irq, unsigned int iflags)
 81 {
 82         unsigned long clr = 0, set = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
 83 
 84         if (irq >= nr_irqs) {
 85                 printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq);
 86                 return;
 87         }
 88 
 89         if (iflags & IRQF_VALID)
 90                 clr |= IRQ_NOREQUEST;
 91         if (iflags & IRQF_PROBE)
 92                 clr |= IRQ_NOPROBE;
 93         if (!(iflags & IRQF_NOAUTOEN))
 94                 clr |= IRQ_NOAUTOEN;
 95         /* Order is clear bits in "clr" then set bits in "set" */
 96         irq_modify_status(irq, clr, set & ~clr);
 97 }
 98 EXPORT_SYMBOL_GPL(set_irq_flags);
 99 
100 void __init init_IRQ(void)
101 {
102         int ret;
103 
104         if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
105                 irqchip_init();
106         else
107                 machine_desc->init_irq();
108 
109         if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
110             (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
111                 outer_cache.write_sec = machine_desc->l2c_write_sec;
112                 ret = l2x0_of_init(machine_desc->l2c_aux_val,
113                                    machine_desc->l2c_aux_mask);
114                 if (ret)
115                         pr_err("L2C: failed to init: %d\n", ret);
116         }
117 }
118 
119 #ifdef CONFIG_MULTI_IRQ_HANDLER
120 void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
121 {
122         if (handle_arch_irq)
123                 return;
124 
125         handle_arch_irq = handle_irq;
126 }
127 #endif
128 
129 #ifdef CONFIG_SPARSE_IRQ
130 int __init arch_probe_nr_irqs(void)
131 {
132         nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
133         return nr_irqs;
134 }
135 #endif
136 
137 #ifdef CONFIG_HOTPLUG_CPU
138 
139 static bool migrate_one_irq(struct irq_desc *desc)
140 {
141         struct irq_data *d = irq_desc_get_irq_data(desc);
142         const struct cpumask *affinity = d->affinity;
143         struct irq_chip *c;
144         bool ret = false;
145 
146         /*
147          * If this is a per-CPU interrupt, or the affinity does not
148          * include this CPU, then we have nothing to do.
149          */
150         if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity))
151                 return false;
152 
153         if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
154                 affinity = cpu_online_mask;
155                 ret = true;
156         }
157 
158         c = irq_data_get_irq_chip(d);
159         if (!c->irq_set_affinity)
160                 pr_debug("IRQ%u: unable to set affinity\n", d->irq);
161         else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret)
162                 cpumask_copy(d->affinity, affinity);
163 
164         return ret;
165 }
166 
167 /*
168  * The current CPU has been marked offline.  Migrate IRQs off this CPU.
169  * If the affinity settings do not allow other CPUs, force them onto any
170  * available CPU.
171  *
172  * Note: we must iterate over all IRQs, whether they have an attached
173  * action structure or not, as we need to get chained interrupts too.
174  */
175 void migrate_irqs(void)
176 {
177         unsigned int i;
178         struct irq_desc *desc;
179         unsigned long flags;
180 
181         local_irq_save(flags);
182 
183         for_each_irq_desc(i, desc) {
184                 bool affinity_broken;
185 
186                 raw_spin_lock(&desc->lock);
187                 affinity_broken = migrate_one_irq(desc);
188                 raw_spin_unlock(&desc->lock);
189 
190                 if (affinity_broken && printk_ratelimit())
191                         pr_warn("IRQ%u no longer affine to CPU%u\n",
192                                 i, smp_processor_id());
193         }
194 
195         local_irq_restore(flags);
196 }
197 #endif /* CONFIG_HOTPLUG_CPU */
198 

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