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>

1 files changed, 2 insertions, 331 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3fcef37154a1..e2347eb63306 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -11,24 +11,15 @@
  */
 
 #include <linux/irq.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/module.h>
 #include <linux/random.h>
+#include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
-#include <linux/rculist.h>
-#include <linux/hash.h>
-#include <linux/radix-tree.h>
+
 #include <trace/events/irq.h>
 
 #include "internals.h"
 
-/*
- * lockdep: we want to handle all irq_desc locks as a single lock-class:
- */
-struct lock_class_key irq_desc_lock_class;
-
 /**
  * handle_bad_irq - handle spurious and unhandled irqs
  * @irq:       the interrupt number
@@ -43,308 +34,6 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
         ack_bad_irq(irq);
 }
 
-#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
-static void __init init_irq_default_affinity(void)
-{
-        alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
-        cpumask_setall(irq_default_affinity);
-}
-#else
-static void __init init_irq_default_affinity(void)
-{
-}
-#endif
-
-/*
- * Linux has a controller-independent interrupt architecture.
- * Every controller has a 'controller-template', that is used
- * by the main code to do the right thing. Each driver-visible
- * interrupt source is transparently wired to the appropriate
- * controller. Thus drivers need not be aware of the
- * interrupt-controller.
- *
- * The code is designed to be easily extended with new/different
- * interrupt controllers, without having to do assembly magic or
- * having to touch the generic code.
- *
- * Controller mappings for all interrupt sources:
- */
-int nr_irqs = NR_IRQS;
-EXPORT_SYMBOL_GPL(nr_irqs);
-
-#ifdef CONFIG_SPARSE_IRQ
-
-static struct irq_desc irq_desc_init = {
-        .status         = IRQ_DISABLED,
-        .handle_irq     = handle_bad_irq,
-        .depth          = 1,
-        .lock           = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
-};
-
-void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
-{
-        void *ptr;
-
-        ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
-                           GFP_ATOMIC, node);
-
-        /*
-         * don't overwite if can not get new one
-         * init_copy_kstat_irqs() could still use old one
-         */
-        if (ptr) {
-                printk(KERN_DEBUG "  alloc kstat_irqs on node %d\n", node);
-                desc->kstat_irqs = ptr;
-        }
-}
-
-static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
-{
-        memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
-
-        raw_spin_lock_init(&desc->lock);
-        desc->irq_data.irq = irq;
-#ifdef CONFIG_SMP
-        desc->irq_data.node = node;
-#endif
-        lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        init_kstat_irqs(desc, node, nr_cpu_ids);
-        if (!desc->kstat_irqs) {
-                printk(KERN_ERR "can not alloc kstat_irqs\n");
-                BUG_ON(1);
-        }
-        if (!alloc_desc_masks(desc, node, false)) {
-                printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
-                BUG_ON(1);
-        }
-        init_desc_masks(desc);
-        arch_init_chip_data(desc, node);
-}
-
-/*
- * Protect the sparse_irqs:
- */
-DEFINE_RAW_SPINLOCK(sparse_irq_lock);
-
-static RADIX_TREE(irq_desc_tree, GFP_ATOMIC);
-
-static void set_irq_desc(unsigned int irq, struct irq_desc *desc)
-{
-        radix_tree_insert(&irq_desc_tree, irq, desc);
-}
-
-struct irq_desc *irq_to_desc(unsigned int irq)
-{
-        return radix_tree_lookup(&irq_desc_tree, irq);
-}
-
-void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
-{
-        void **ptr;
-
-        ptr = radix_tree_lookup_slot(&irq_desc_tree, irq);
-        if (ptr)
-                radix_tree_replace_slot(ptr, desc);
-}
-
-static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
-        [0 ... NR_IRQS_LEGACY-1] = {
-                .status         = IRQ_DISABLED,
-                .handle_irq     = handle_bad_irq,
-                .depth          = 1,
-                .lock           = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
-        }
-};
-
-static unsigned int *kstat_irqs_legacy;
-
-int __init early_irq_init(void)
-{
-        struct irq_desc *desc;
-        int legacy_count;
-        int node;
-        int i;
-
-        init_irq_default_affinity();
-
-         /* initialize nr_irqs based on nr_cpu_ids */
-        arch_probe_nr_irqs();
-        printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
-
-        desc = irq_desc_legacy;
-        legacy_count = ARRAY_SIZE(irq_desc_legacy);
-        node = first_online_node;
-
-        /* allocate based on nr_cpu_ids */
-        kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids *
-                                          sizeof(int), GFP_NOWAIT, node);
-
-        irq_desc_init.irq_data.chip = &no_irq_chip;
-
-        for (i = 0; i < legacy_count; i++) {
-                desc[i].irq_data.irq = i;
-                desc[i].irq_data.chip = &no_irq_chip;
-#ifdef CONFIG_SMP
-                desc[i].irq_data.node = node;
-#endif
-                desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
-                lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
-                alloc_desc_masks(&desc[i], node, true);
-                init_desc_masks(&desc[i]);
-                set_irq_desc(i, &desc[i]);
-        }
-
-        return arch_early_irq_init();
-}
-
-struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
-{
-        struct irq_desc *desc;
-        unsigned long flags;
-
-        if (irq >= nr_irqs) {
-                WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
-                        irq, nr_irqs);
-                return NULL;
-        }
-
-        desc = irq_to_desc(irq);
-        if (desc)
-                return desc;
-
-        raw_spin_lock_irqsave(&sparse_irq_lock, flags);
-
-        /* We have to check it to avoid races with another CPU */
-        desc = irq_to_desc(irq);
-        if (desc)
-                goto out_unlock;
-
-        desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
-
-        printk(KERN_DEBUG "  alloc irq_desc for %d on node %d\n", irq, node);
-        if (!desc) {
-                printk(KERN_ERR "can not alloc irq_desc\n");
-                BUG_ON(1);
-        }
-        init_one_irq_desc(irq, desc, node);
-
-        set_irq_desc(irq, desc);
-
-out_unlock:
-        raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
-
-        return desc;
-}
-
-#else /* !CONFIG_SPARSE_IRQ */
-
-struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
-        [0 ... NR_IRQS-1] = {
-                .status         = IRQ_DISABLED,
-                .handle_irq     = handle_bad_irq,
-                .depth          = 1,
-                .lock           = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
-        }
-};
-
-static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
-int __init early_irq_init(void)
-{
-        struct irq_desc *desc;
-        int count;
-        int i;
-
-        init_irq_default_affinity();
-
-        printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
-
-        desc = irq_desc;
-        count = ARRAY_SIZE(irq_desc);
-
-        for (i = 0; i < count; i++) {
-                desc[i].irq_data.irq = i;
-                desc[i].irq_data.chip = &no_irq_chip;
-                alloc_desc_masks(&desc[i], 0, true);
-                init_desc_masks(&desc[i]);
-                desc[i].kstat_irqs = kstat_irqs_all[i];
-        }
-        return arch_early_irq_init();
-}
-
-struct irq_desc *irq_to_desc(unsigned int irq)
-{
-        return (irq < NR_IRQS) ? irq_desc + irq : NULL;
-}
-
-struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
-{
-        return irq_to_desc(irq);
-}
-#endif /* !CONFIG_SPARSE_IRQ */
-
-void clear_kstat_irqs(struct irq_desc *desc)
-{
-        memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
-}
-
-/*
- * What should we do if we get a hw irq event on an illegal vector?
- * Each architecture has to answer this themself.
- */
-static void ack_bad(struct irq_data *data)
-{
-        struct irq_desc *desc = irq_data_to_desc(data);
-
-        print_irq_desc(data->irq, desc);
-        ack_bad_irq(data->irq);
-}
-
-/*
- * NOP functions
- */
-static void noop(struct irq_data *data) { }
-
-static unsigned int noop_ret(struct irq_data *data)
-{
-        return 0;
-}
-
-#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
-static void compat_noop(unsigned int irq) { }
-#define END_INIT .end = compat_noop
-#else
-#define END_INIT
-#endif
-
-/*
- * Generic no controller implementation
- */
-struct irq_chip no_irq_chip = {
-        .name           = "none",
-        .irq_startup    = noop_ret,
-        .irq_shutdown   = noop,
-        .irq_enable     = noop,
-        .irq_disable    = noop,
-        .irq_ack        = ack_bad,
-        END_INIT
-};
-
-/*
- * Generic dummy implementation which can be used for
- * real dumb interrupt sources
- */
-struct irq_chip dummy_irq_chip = {
-        .name           = "dummy",
-        .irq_startup    = noop_ret,
-        .irq_shutdown   = noop,
-        .irq_enable     = noop,
-        .irq_disable    = noop,
-        .irq_ack        = noop,
-        .irq_mask       = noop,
-        .irq_unmask     = noop,
-        END_INIT
-};
-
 /*
  * Special, empty irq handler:
  */
@@ -540,21 +229,3 @@ out:
         return 1;
 }
 #endif
-
-void early_init_irq_lock_class(void)
-{
-        struct irq_desc *desc;
-        int i;
-
-        for_each_irq_desc(i, desc) {
-                lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        }
-}
-
-unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
-{
-        struct irq_desc *desc = irq_to_desc(irq);
-        return desc ? desc->kstat_irqs[cpu] : 0;
-}
-EXPORT_SYMBOL(kstat_irqs_cpu);
-