sparse irq_desc[] array: core kernel and x86 changes

[net-next-2.6.git] / include / linux / irq.h

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3dddfa703ebd95ab1253c56397104c2607f98e90..63b00439d4d285cea69ba03bc6e6f001b20d2497 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -129,6 +129,8 @@ struct irq_chip {
        const char      *typename;
 };
 
+struct timer_rand_state;
+struct irq_2_iommu;
 /**
  * struct irq_desc - interrupt descriptor
  * @irq:               interrupt number for this descriptor
@@ -154,6 +156,13 @@ struct irq_chip {
  */
 struct irq_desc {
        unsigned int            irq;
+#ifdef CONFIG_SPARSE_IRQ
+       struct timer_rand_state *timer_rand_state;
+       unsigned int            *kstat_irqs;
+# ifdef CONFIG_INTR_REMAP
+       struct irq_2_iommu      *irq_2_iommu;
+# endif
+#endif
        irq_flow_handler_t      handle_irq;
        struct irq_chip         *chip;
        struct msi_desc         *msi_desc;
@@ -181,14 +190,52 @@ struct irq_desc {
        const char              *name;
 } ____cacheline_internodealigned_in_smp;
 
+extern void early_irq_init(void);
+extern void arch_early_irq_init(void);
+extern void arch_init_chip_data(struct irq_desc *desc, int cpu);
+extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
+                                       struct irq_desc *desc, int cpu);
+extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
+
+#ifndef CONFIG_SPARSE_IRQ
 
 extern struct irq_desc irq_desc[NR_IRQS];
 
 static inline struct irq_desc *irq_to_desc(unsigned int irq)
 {
-       return (irq < nr_irqs) ? irq_desc + irq : NULL;
+       return (irq < NR_IRQS) ? irq_desc + irq : NULL;
+}
+static inline struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+       return irq_to_desc(irq);
 }
 
+#ifdef CONFIG_GENERIC_HARDIRQS
+# define for_each_irq_desc(irq, desc)          \
+       for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
+# define for_each_irq_desc_reverse(irq, desc)                          \
+       for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1);        \
+           irq >= 0; irq--, desc--)
+#endif
+
+#else
+
+extern struct irq_desc *irq_to_desc(unsigned int irq);
+extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
+extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
+
+# define for_each_irq_desc(irq, desc)          \
+       for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; irq++, desc = irq_to_desc(irq))
+# define for_each_irq_desc_reverse(irq, desc)                          \
+       for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0; irq--, desc = irq_to_desc(irq))
+
+#define kstat_irqs_this_cpu(DESC) \
+       ((DESC)->kstat_irqs[smp_processor_id()])
+#define kstat_incr_irqs_this_cpu(irqno, DESC) \
+       ((DESC)->kstat_irqs[smp_processor_id()]++)
+
+#endif
+
 /*
  * Migration helpers for obsolete names, they will go away:
  */
@@ -380,6 +427,11 @@ extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 #define get_irq_data(irq)      (irq_to_desc(irq)->handler_data)
 #define get_irq_msi(irq)       (irq_to_desc(irq)->msi_desc)
 
+#define get_irq_desc_chip(desc)                ((desc)->chip)
+#define get_irq_desc_chip_data(desc)   ((desc)->chip_data)
+#define get_irq_desc_data(desc)                ((desc)->handler_data)
+#define get_irq_desc_msi(desc)         ((desc)->msi_desc)
+
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #endif /* !CONFIG_S390 */