irq: change ->set_affinity() to return status

[deliverable/linux.git] / include / linux / irq.h

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 974890b3c52fbfe0048df3cf7d736798caf873b6..8e4c18b291579abbc4b83c3a4f4b26a7c6572af4 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -22,6 +22,7 @@
 #include <linux/irqnr.h>
 #include <linux/errno.h>
 #include <linux/topology.h>
+#include <linux/wait.h>
 
 #include <asm/irq.h>
 #include <asm/ptrace.h>
@@ -116,7 +117,7 @@ struct irq_chip {
        void            (*eoi)(unsigned int irq);
 
        void            (*end)(unsigned int irq);
-       void            (*set_affinity)(unsigned int irq,
+       int             (*set_affinity)(unsigned int irq,
                                        const struct cpumask *dest);
        int             (*retrigger)(unsigned int irq);
        int             (*set_type)(unsigned int irq, unsigned int flow_type);
@@ -158,6 +159,8 @@ struct irq_2_iommu;
  * @affinity:          IRQ affinity on SMP
  * @cpu:               cpu index useful for balancing
  * @pending_mask:      pending rebalanced interrupts
+ * @threads_active:    number of irqaction threads currently running
+ * @wait_for_threads:  wait queue for sync_irq to wait for threaded handlers
  * @dir:               /proc/irq/ procfs entry
  * @name:              flow handler name for /proc/interrupts output
  */
@@ -189,6 +192,8 @@ struct irq_desc {
        cpumask_var_t           pending_mask;
 #endif
 #endif
+       atomic_t                threads_active;
+       wait_queue_head_t       wait_for_threads;
 #ifdef CONFIG_PROC_FS
        struct proc_dir_entry   *dir;
 #endif
@@ -207,16 +212,6 @@ extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
 
 extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
 
-static inline struct irq_desc *
-irq_remap_to_desc(unsigned int irq, struct irq_desc *desc)
-{
-#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
-       return irq_to_desc(irq);
-#else
-       return desc;
-#endif
-}
-
 /*
  * Migration helpers for obsolete names, they will go away:
  */
@@ -419,27 +414,25 @@ extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 
 #ifdef CONFIG_SMP
 /**
- * init_alloc_desc_masks - allocate cpumasks for irq_desc
+ * alloc_desc_masks - allocate cpumasks for irq_desc
  * @desc:      pointer to irq_desc struct
  * @cpu:       cpu which will be handling the cpumasks
  * @boot:      true if need bootmem
  *
  * Allocates affinity and pending_mask cpumask if required.
  * Returns true if successful (or not required).
- * Side effect: affinity has all bits set, pending_mask has all bits clear.
  */
-static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
+static inline bool alloc_desc_masks(struct irq_desc *desc, int cpu,
                                                                bool boot)
 {
+#ifdef CONFIG_CPUMASK_OFFSTACK
        int node;
 
        if (boot) {
                alloc_bootmem_cpumask_var(&desc->affinity);
-               cpumask_setall(desc->affinity);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
                alloc_bootmem_cpumask_var(&desc->pending_mask);
-               cpumask_clear(desc->pending_mask);
 #endif
                return true;
        }
@@ -448,18 +441,25 @@ static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
 
        if (!alloc_cpumask_var_node(&desc->affinity, GFP_ATOMIC, node))
                return false;
-       cpumask_setall(desc->affinity);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
        if (!alloc_cpumask_var_node(&desc->pending_mask, GFP_ATOMIC, node)) {
                free_cpumask_var(desc->affinity);
                return false;
        }
-       cpumask_clear(desc->pending_mask);
+#endif
 #endif
        return true;
 }
 
+static inline void init_desc_masks(struct irq_desc *desc)
+{
+       cpumask_setall(desc->affinity);
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+       cpumask_clear(desc->pending_mask);
+#endif
+}
+
 /**
  * init_copy_desc_masks - copy cpumasks for irq_desc
  * @old_desc:  pointer to old irq_desc struct
@@ -473,7 +473,7 @@ static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
                                        struct irq_desc *new_desc)
 {
-#ifdef CONFIG_CPUMASKS_OFFSTACK
+#ifdef CONFIG_CPUMASK_OFFSTACK
        cpumask_copy(new_desc->affinity, old_desc->affinity);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
@@ -482,19 +482,37 @@ static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 #endif
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+                                  struct irq_desc *new_desc)
+{
+       free_cpumask_var(old_desc->affinity);
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+       free_cpumask_var(old_desc->pending_mask);
+#endif
+}
+
 #else /* !CONFIG_SMP */
 
-static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
+static inline bool alloc_desc_masks(struct irq_desc *desc, int cpu,
                                                                bool boot)
 {
        return true;
 }
 
+static inline void init_desc_masks(struct irq_desc *desc)
+{
+}
+
 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
                                        struct irq_desc *new_desc)
 {
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+                                  struct irq_desc *new_desc)
+{
+}
 #endif /* CONFIG_SMP */
 
 #endif /* _LINUX_IRQ_H */