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genirq: Distangle kernel/irq/handle.c
kernel/irq/handle.c has become a dumpground for random code in random order. Split out the irq descriptor management and the dummy irq_chip implementation into separate files. Cleanup the include maze while at it. No code change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
parent
f303a6dd12
commit
3795de236d
4 changed files with 340 additions and 332 deletions
269
kernel/irq/irqdesc.c
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269
kernel/irq/irqdesc.c
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/*
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* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
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* Copyright (C) 2005-2006, Thomas Gleixner, Russell King
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*
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* This file contains the interrupt descriptor management code
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*
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* Detailed information is available in Documentation/DocBook/genericirq
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*
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*/
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/radix-tree.h>
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#include "internals.h"
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/*
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* lockdep: we want to handle all irq_desc locks as a single lock-class:
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*/
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struct lock_class_key irq_desc_lock_class;
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#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
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static void __init init_irq_default_affinity(void)
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{
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alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
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cpumask_setall(irq_default_affinity);
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}
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#else
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static void __init init_irq_default_affinity(void)
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{
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}
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#endif
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int nr_irqs = NR_IRQS;
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EXPORT_SYMBOL_GPL(nr_irqs);
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#ifdef CONFIG_SPARSE_IRQ
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static struct irq_desc irq_desc_init = {
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.status = IRQ_DISABLED,
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.handle_irq = handle_bad_irq,
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.depth = 1,
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.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
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};
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void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
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{
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void *ptr;
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ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
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GFP_ATOMIC, node);
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/*
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* don't overwite if can not get new one
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* init_copy_kstat_irqs() could still use old one
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*/
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if (ptr) {
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printk(KERN_DEBUG " alloc kstat_irqs on node %d\n", node);
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desc->kstat_irqs = ptr;
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}
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}
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static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
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{
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memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
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raw_spin_lock_init(&desc->lock);
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desc->irq_data.irq = irq;
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#ifdef CONFIG_SMP
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desc->irq_data.node = node;
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#endif
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lockdep_set_class(&desc->lock, &irq_desc_lock_class);
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init_kstat_irqs(desc, node, nr_cpu_ids);
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if (!desc->kstat_irqs) {
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printk(KERN_ERR "can not alloc kstat_irqs\n");
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BUG_ON(1);
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}
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if (!alloc_desc_masks(desc, node, false)) {
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printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
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BUG_ON(1);
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}
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init_desc_masks(desc);
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arch_init_chip_data(desc, node);
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}
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/*
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* Protect the sparse_irqs:
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*/
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DEFINE_RAW_SPINLOCK(sparse_irq_lock);
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static RADIX_TREE(irq_desc_tree, GFP_ATOMIC);
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static void set_irq_desc(unsigned int irq, struct irq_desc *desc)
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{
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radix_tree_insert(&irq_desc_tree, irq, desc);
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}
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struct irq_desc *irq_to_desc(unsigned int irq)
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{
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return radix_tree_lookup(&irq_desc_tree, irq);
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}
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void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
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{
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void **ptr;
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ptr = radix_tree_lookup_slot(&irq_desc_tree, irq);
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if (ptr)
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radix_tree_replace_slot(ptr, desc);
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}
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static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
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[0 ... NR_IRQS_LEGACY-1] = {
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.status = IRQ_DISABLED,
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.handle_irq = handle_bad_irq,
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.depth = 1,
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.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
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}
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};
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static unsigned int *kstat_irqs_legacy;
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int __init early_irq_init(void)
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{
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struct irq_desc *desc;
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int legacy_count;
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int node;
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int i;
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init_irq_default_affinity();
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/* initialize nr_irqs based on nr_cpu_ids */
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arch_probe_nr_irqs();
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printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
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desc = irq_desc_legacy;
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legacy_count = ARRAY_SIZE(irq_desc_legacy);
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node = first_online_node;
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/* allocate based on nr_cpu_ids */
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kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids *
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sizeof(int), GFP_NOWAIT, node);
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irq_desc_init.irq_data.chip = &no_irq_chip;
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for (i = 0; i < legacy_count; i++) {
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desc[i].irq_data.irq = i;
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desc[i].irq_data.chip = &no_irq_chip;
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#ifdef CONFIG_SMP
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desc[i].irq_data.node = node;
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#endif
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desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
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lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
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alloc_desc_masks(&desc[i], node, true);
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init_desc_masks(&desc[i]);
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set_irq_desc(i, &desc[i]);
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}
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return arch_early_irq_init();
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}
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struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
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{
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struct irq_desc *desc;
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unsigned long flags;
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if (irq >= nr_irqs) {
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WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
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irq, nr_irqs);
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return NULL;
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}
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desc = irq_to_desc(irq);
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if (desc)
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return desc;
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raw_spin_lock_irqsave(&sparse_irq_lock, flags);
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/* We have to check it to avoid races with another CPU */
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desc = irq_to_desc(irq);
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if (desc)
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goto out_unlock;
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desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
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printk(KERN_DEBUG " alloc irq_desc for %d on node %d\n", irq, node);
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if (!desc) {
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printk(KERN_ERR "can not alloc irq_desc\n");
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BUG_ON(1);
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}
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init_one_irq_desc(irq, desc, node);
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set_irq_desc(irq, desc);
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out_unlock:
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raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
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return desc;
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}
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#else /* !CONFIG_SPARSE_IRQ */
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struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
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[0 ... NR_IRQS-1] = {
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.status = IRQ_DISABLED,
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.handle_irq = handle_bad_irq,
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.depth = 1,
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.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
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}
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};
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static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
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int __init early_irq_init(void)
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{
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struct irq_desc *desc;
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int count;
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int i;
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init_irq_default_affinity();
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printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
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desc = irq_desc;
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count = ARRAY_SIZE(irq_desc);
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for (i = 0; i < count; i++) {
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desc[i].irq_data.irq = i;
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desc[i].irq_data.chip = &no_irq_chip;
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alloc_desc_masks(&desc[i], 0, true);
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init_desc_masks(&desc[i]);
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desc[i].kstat_irqs = kstat_irqs_all[i];
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}
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return arch_early_irq_init();
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}
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struct irq_desc *irq_to_desc(unsigned int irq)
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{
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return (irq < NR_IRQS) ? irq_desc + irq : NULL;
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}
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struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
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{
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return irq_to_desc(irq);
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}
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#endif /* !CONFIG_SPARSE_IRQ */
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void clear_kstat_irqs(struct irq_desc *desc)
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{
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memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
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}
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void early_init_irq_lock_class(void)
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{
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struct irq_desc *desc;
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int i;
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for_each_irq_desc(i, desc) {
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lockdep_set_class(&desc->lock, &irq_desc_lock_class);
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}
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}
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unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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return desc ? desc->kstat_irqs[cpu] : 0;
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}
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EXPORT_SYMBOL(kstat_irqs_cpu);
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