/*
* lockdep: we want to handle all irq_desc locks as a single lock-class:
*/
-struct lock_class_key irq_desc_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)
static void desc_smp_init(struct irq_desc *desc, int node)
{
- desc->node = 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->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);
-DEFINE_RAW_SPINLOCK(sparse_irq_lock);
+static DEFINE_MUTEX(sparse_irq_lock);
static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
#ifdef CONFIG_SPARSE_IRQ
-static struct irq_desc irq_desc_init = {
- .status = IRQ_DEFAULT_INIT_FLAGS,
- .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);
-}
-
static RADIX_TREE(irq_desc_tree, GFP_ATOMIC);
static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
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 void delete_irq_desc(unsigned int irq)
{
radix_tree_delete(&irq_desc_tree, irq);
static struct irq_desc *alloc_desc(int irq, int node)
{
+ /* Temporary hack until we can switch to GFP_KERNEL */
+ gfp_t gfp = gfp_allowed_mask == GFP_BOOT_MASK ? GFP_NOWAIT : GFP_ATOMIC;
struct irq_desc *desc;
- gfp_t gfp = GFP_KERNEL;
desc = kzalloc_node(sizeof(*desc), gfp, node);
if (!desc)
static void free_desc(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
- unsigned long flags;
unregister_irq_proc(irq, desc);
- raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+ mutex_lock(&sparse_irq_lock);
delete_irq_desc(irq);
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ mutex_unlock(&sparse_irq_lock);
free_masks(desc);
kfree(desc->kstat_irqs);
static int alloc_descs(unsigned int start, unsigned int cnt, int node)
{
struct irq_desc *desc;
- unsigned long flags;
int i;
for (i = 0; i < cnt; i++) {
desc = alloc_desc(start + i, node);
if (!desc)
goto err;
- raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+ mutex_lock(&sparse_irq_lock);
irq_insert_desc(start + i, desc);
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ mutex_unlock(&sparse_irq_lock);
}
return start;
for (i--; i >= 0; i--)
free_desc(start + i);
- raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+ mutex_lock(&sparse_irq_lock);
bitmap_clear(allocated_irqs, start, cnt);
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ mutex_unlock(&sparse_irq_lock);
return -ENOMEM;
}
-static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
- [0 ... NR_IRQS_LEGACY-1] = {
- .status = IRQ_DEFAULT_INIT_FLAGS,
- .handle_irq = handle_bad_irq,
- .depth = 1,
- .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
- }
-};
+struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
+{
+ int res = irq_alloc_descs(irq, irq, 1, node);
-static unsigned int *kstat_irqs_legacy;
+ 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;
- 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);
+ /* 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);
- 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]);
- irq_insert_desc(i, &desc[i]);
+ 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();
}
-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);
-
- irq_insert_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 = {
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;
- int count;
- int i;
init_irq_default_affinity();
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];
+ 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();
return irq_to_desc(irq);
}
-#ifdef CONFIG_SMP
-static inline int desc_node(struct irq_desc *desc)
-{
- return desc->irq_data.node;
-}
-#else
-static inline int desc_node(struct irq_desc *desc) { return 0; }
-#endif
-
static void free_desc(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);
+ dynamic_irq_cleanup(irq);
}
static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
*/
void irq_free_descs(unsigned int from, unsigned int cnt)
{
- unsigned long flags;
int i;
if (from >= nr_irqs || (from + cnt) > nr_irqs)
for (i = 0; i < cnt; i++)
free_desc(from + i);
- raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+ mutex_lock(&sparse_irq_lock);
bitmap_clear(allocated_irqs, from, cnt);
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ mutex_unlock(&sparse_irq_lock);
}
/**
int __ref
irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node)
{
- unsigned long flags;
int start, ret;
if (!cnt)
return -EINVAL;
- raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+ mutex_lock(&sparse_irq_lock);
start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
ret = -EEXIST;
goto err;
bitmap_set(allocated_irqs, start, cnt);
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ mutex_unlock(&sparse_irq_lock);
return alloc_descs(start, cnt, node);
err:
- raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
+ 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;
}
return find_next_bit(allocated_irqs, nr_irqs, offset);
}
-/* Statistics access */
-void clear_kstat_irqs(struct irq_desc *desc)
+/**
+ * dynamic_irq_cleanup - cleanup a dynamically allocated irq
+ * @irq: irq number to initialize
+ */
+void dynamic_irq_cleanup(unsigned int irq)
{
- memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
+ 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)
git.openpandora.org / pandora-kernel.git / blobdiff