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Diffstat (limited to 'kernel/irq/irqdesc.c')
-rw-r--r--kernel/irq/irqdesc.c95
1 files changed, 63 insertions, 32 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index bb07f2928f4b..7339e42a85ab 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -278,7 +278,12 @@ EXPORT_SYMBOL(irq_to_desc);
static void free_desc(unsigned int irq)
{
- dynamic_irq_cleanup(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), NULL);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
}
static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
@@ -299,6 +304,20 @@ static int irq_expand_nr_irqs(unsigned int nr)
return -ENOMEM;
}
+void irq_mark_irq(unsigned int irq)
+{
+ mutex_lock(&sparse_irq_lock);
+ bitmap_set(allocated_irqs, irq, 1);
+ mutex_unlock(&sparse_irq_lock);
+}
+
+#ifdef CONFIG_GENERIC_IRQ_LEGACY
+void irq_init_desc(unsigned int irq)
+{
+ free_desc(irq);
+}
+#endif
+
#endif /* !CONFIG_SPARSE_IRQ */
/**
@@ -396,30 +415,56 @@ err:
}
EXPORT_SYMBOL_GPL(__irq_alloc_descs);
+#ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
/**
- * irq_reserve_irqs - mark irqs allocated
- * @from: mark from irq number
- * @cnt: number of irqs to mark
+ * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
+ * @cnt: number of interrupts to allocate
+ * @node: node on which to allocate
*
- * Returns 0 on success or an appropriate error code
+ * Returns an interrupt number > 0 or 0, if the allocation fails.
*/
-int irq_reserve_irqs(unsigned int from, unsigned int cnt)
+unsigned int irq_alloc_hwirqs(int cnt, int node)
{
- unsigned int start;
- int ret = 0;
+ int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL);
- if (!cnt || (from + cnt) > nr_irqs)
- return -EINVAL;
+ if (irq < 0)
+ return 0;
- 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;
+ for (i = irq; cnt > 0; i++, cnt--) {
+ if (arch_setup_hwirq(i, node))
+ goto err;
+ irq_clear_status_flags(i, _IRQ_NOREQUEST);
+ }
+ return irq;
+
+err:
+ for (i--; i >= irq; i--) {
+ irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
+ arch_teardown_hwirq(i);
+ }
+ irq_free_descs(irq, cnt);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
+
+/**
+ * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
+ * @from: Free from irq number
+ * @cnt: number of interrupts to free
+ *
+ */
+void irq_free_hwirqs(unsigned int from, int cnt)
+{
+ int i;
+
+ for (i = from; cnt > 0; i++, cnt--) {
+ irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
+ arch_teardown_hwirq(i);
+ }
+ irq_free_descs(from, cnt);
}
+EXPORT_SYMBOL_GPL(irq_free_hwirqs);
+#endif
/**
* irq_get_next_irq - get next allocated irq number
@@ -482,20 +527,6 @@ int irq_set_percpu_devid(unsigned int irq)
return 0;
}
-/**
- * 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), NULL);
- raw_spin_unlock_irqrestore(&desc->lock, flags);
-}
-
void kstat_incr_irq_this_cpu(unsigned int irq)
{
kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));