1 files changed, 395 insertions, 0 deletions

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
new file mode 100644
index 000000000000..9d917ff72675
--- /dev/null
+++ b/kernel/irq/irqdesc.c
@@ -0,0 +1,395 @@
+/*
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
+ *
+ * This file contains the interrupt descriptor management code
+ *
+ * Detailed information is available in Documentation/DocBook/genericirq
+ *
+ */
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/radix-tree.h>
+#include <linux/bitmap.h>
+
+#include "internals.h"
+
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+static struct lock_class_key irq_desc_lock_class;
+
+#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
+
+#ifdef CONFIG_SMP
+static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node)
+{
+        if (!zalloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node))
+                return -ENOMEM;
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        if (!zalloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
+                free_cpumask_var(desc->irq_data.affinity);
+                return -ENOMEM;
+        }
+#endif
+        return 0;
+}
+
+static void desc_smp_init(struct irq_desc *desc, int node)
+{
+        desc->irq_data.node = node;
+        cpumask_copy(desc->irq_data.affinity, irq_default_affinity);
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        cpumask_clear(desc->pending_mask);
+#endif
+}
+
+static inline int desc_node(struct irq_desc *desc)
+{
+        return desc->irq_data.node;
+}
+
+#else
+static inline int
+alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
+static inline void desc_smp_init(struct irq_desc *desc, int node) { }
+static inline int desc_node(struct irq_desc *desc) { return 0; }
+#endif
+
+static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
+{
+        desc->irq_data.irq = irq;
+        desc->irq_data.chip = &no_irq_chip;
+        desc->irq_data.chip_data = NULL;
+        desc->irq_data.handler_data = NULL;
+        desc->irq_data.msi_desc = NULL;
+        desc->status = IRQ_DEFAULT_INIT_FLAGS;
+        desc->handle_irq = handle_bad_irq;
+        desc->depth = 1;
+        desc->irq_count = 0;
+        desc->irqs_unhandled = 0;
+        desc->name = NULL;
+        memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
+        desc_smp_init(desc, node);
+}
+
+int nr_irqs = NR_IRQS;
+EXPORT_SYMBOL_GPL(nr_irqs);
+
+static DEFINE_MUTEX(sparse_irq_lock);
+static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
+
+#ifdef CONFIG_SPARSE_IRQ
+
+static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
+
+static void irq_insert_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);
+}
+
+static void delete_irq_desc(unsigned int irq)
+{
+        radix_tree_delete(&irq_desc_tree, irq);
+}
+
+#ifdef CONFIG_SMP
+static void free_masks(struct irq_desc *desc)
+{
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        free_cpumask_var(desc->pending_mask);
+#endif
+        free_cpumask_var(desc->irq_data.affinity);
+}
+#else
+static inline void free_masks(struct irq_desc *desc) { }
+#endif
+
+static struct irq_desc *alloc_desc(int irq, int node)
+{
+        struct irq_desc *desc;
+        gfp_t gfp = GFP_KERNEL;
+
+        desc = kzalloc_node(sizeof(*desc), gfp, node);
+        if (!desc)
+                return NULL;
+        /* allocate based on nr_cpu_ids */
+        desc->kstat_irqs = kzalloc_node(nr_cpu_ids * sizeof(*desc->kstat_irqs),
+                                         gfp, node);
+        if (!desc->kstat_irqs)
+                goto err_desc;
+
+        if (alloc_masks(desc, gfp, node))
+                goto err_kstat;
+
+        raw_spin_lock_init(&desc->lock);
+        lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+
+        desc_set_defaults(irq, desc, node);
+
+        return desc;
+
+err_kstat:
+        kfree(desc->kstat_irqs);
+err_desc:
+        kfree(desc);
+        return NULL;
+}
+
+static void free_desc(unsigned int irq)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+
+        unregister_irq_proc(irq, desc);
+
+        mutex_lock(&sparse_irq_lock);
+        delete_irq_desc(irq);
+        mutex_unlock(&sparse_irq_lock);
+
+        free_masks(desc);
+        kfree(desc->kstat_irqs);
+        kfree(desc);
+}
+
+static int alloc_descs(unsigned int start, unsigned int cnt, int node)
+{
+        struct irq_desc *desc;
+        int i;
+
+        for (i = 0; i < cnt; i++) {
+                desc = alloc_desc(start + i, node);
+                if (!desc)
+                        goto err;
+                mutex_lock(&sparse_irq_lock);
+                irq_insert_desc(start + i, desc);
+                mutex_unlock(&sparse_irq_lock);
+        }
+        return start;
+
+err:
+        for (i--; i >= 0; i--)
+                free_desc(start + i);
+
+        mutex_lock(&sparse_irq_lock);
+        bitmap_clear(allocated_irqs, start, cnt);
+        mutex_unlock(&sparse_irq_lock);
+        return -ENOMEM;
+}
+
+struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
+{
+        int res = irq_alloc_descs(irq, irq, 1, node);
+
+        if (res == -EEXIST || res == irq)
+                return irq_to_desc(irq);
+        return NULL;
+}
+
+int __init early_irq_init(void)
+{
+        int i, initcnt, node = first_online_node;
+        struct irq_desc *desc;
+
+        init_irq_default_affinity();
+
+        /* Let arch update nr_irqs and return the nr of preallocated irqs */
+        initcnt = arch_probe_nr_irqs();
+        printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
+
+        for (i = 0; i < initcnt; i++) {
+                desc = alloc_desc(i, node);
+                set_bit(i, allocated_irqs);
+                irq_insert_desc(i, desc);
+        }
+        return arch_early_irq_init();
+}
+
+#else /* !CONFIG_SPARSE_IRQ */
+
+struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
+        [0 ... NR_IRQS-1] = {
+                .status         = IRQ_DEFAULT_INIT_FLAGS,
+                .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)
+{
+        int count, i, node = first_online_node;
+        struct irq_desc *desc;
+
+        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;
+                desc[i].kstat_irqs = kstat_irqs_all[i];
+                alloc_masks(desc + i, GFP_KERNEL, node);
+                desc_smp_init(desc + i, node);
+                lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
+        }
+        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);
+}
+
+static void free_desc(unsigned int irq)
+{
+        dynamic_irq_cleanup(irq);
+}
+
+static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
+{
+        return start;
+}
+#endif /* !CONFIG_SPARSE_IRQ */
+
+/* Dynamic interrupt handling */
+
+/**
+ * irq_free_descs - free irq descriptors
+ * @from:       Start of descriptor range
+ * @cnt:        Number of consecutive irqs to free
+ */
+void irq_free_descs(unsigned int from, unsigned int cnt)
+{
+        int i;
+
+        if (from >= nr_irqs || (from + cnt) > nr_irqs)
+                return;
+
+        for (i = 0; i < cnt; i++)
+                free_desc(from + i);
+
+        mutex_lock(&sparse_irq_lock);
+        bitmap_clear(allocated_irqs, from, cnt);
+        mutex_unlock(&sparse_irq_lock);
+}
+
+/**
+ * irq_alloc_descs - allocate and initialize a range of irq descriptors
+ * @irq:        Allocate for specific irq number if irq >= 0
+ * @from:       Start the search from this irq number
+ * @cnt:        Number of consecutive irqs to allocate.
+ * @node:       Preferred node on which the irq descriptor should be allocated
+ *
+ * Returns the first irq number or error code
+ */
+int __ref
+irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node)
+{
+        int start, ret;
+
+        if (!cnt)
+                return -EINVAL;
+
+        mutex_lock(&sparse_irq_lock);
+
+        start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
+        ret = -EEXIST;
+        if (irq >=0 && start != irq)
+                goto err;
+
+        ret = -ENOMEM;
+        if (start >= nr_irqs)
+                goto err;
+
+        bitmap_set(allocated_irqs, start, cnt);
+        mutex_unlock(&sparse_irq_lock);
+        return alloc_descs(start, cnt, node);
+
+err:
+        mutex_unlock(&sparse_irq_lock);
+        return ret;
+}
+
+/**
+ * irq_reserve_irqs - mark irqs allocated
+ * @from:       mark from irq number
+ * @cnt:        number of irqs to mark
+ *
+ * Returns 0 on success or an appropriate error code
+ */
+int irq_reserve_irqs(unsigned int from, unsigned int cnt)
+{
+        unsigned int start;
+        int ret = 0;
+
+        if (!cnt || (from + cnt) > nr_irqs)
+                return -EINVAL;
+
+        mutex_lock(&sparse_irq_lock);
+        start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
+        if (start == from)
+                bitmap_set(allocated_irqs, start, cnt);
+        else
+                ret = -EEXIST;
+        mutex_unlock(&sparse_irq_lock);
+        return ret;
+}
+
+/**
+ * irq_get_next_irq - get next allocated irq number
+ * @offset:     where to start the search
+ *
+ * Returns next irq number after offset or nr_irqs if none is found.
+ */
+unsigned int irq_get_next_irq(unsigned int offset)
+{
+        return find_next_bit(allocated_irqs, nr_irqs, offset);
+}
+
+/**
+ * dynamic_irq_cleanup - cleanup a dynamically allocated irq
+ * @irq:        irq number to initialize
+ */
+void dynamic_irq_cleanup(unsigned int irq)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        unsigned long flags;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+        desc_set_defaults(irq, desc, desc_node(desc));
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+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;
+}