genirq: Distangle irq.h

Move irq_desc and internal functions out of irq.h

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 171 insertions, 0 deletions

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
new file mode 100644
index 000000000000..22e426fdd301
--- /dev/null
+++ b/include/linux/irqdesc.h
@@ -0,0 +1,171 @@
+#ifndef _LINUX_IRQDESC_H
+#define _LINUX_IRQDESC_H
+
+/*
+ * Core internal functions to deal with irq descriptors
+ *
+ * This include will move to kernel/irq once we cleaned up the tree.
+ * For now it's included from <linux/irq.h>
+ */
+
+struct proc_dir_entry;
+struct timer_rand_state;
+struct irq_2_iommu;
+/**
+ * struct irq_desc - interrupt descriptor
+ * @irq_data:           per irq and chip data passed down to chip functions
+ * @timer_rand_state:   pointer to timer rand state struct
+ * @kstat_irqs:         irq stats per cpu
+ * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
+ * @action:             the irq action chain
+ * @status:             status information
+ * @depth:              disable-depth, for nested irq_disable() calls
+ * @wake_depth:         enable depth, for multiple set_irq_wake() callers
+ * @irq_count:          stats field to detect stalled irqs
+ * @last_unhandled:     aging timer for unhandled count
+ * @irqs_unhandled:     stats field for spurious unhandled interrupts
+ * @lock:               locking for SMP
+ * @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
+ */
+struct irq_desc {
+
+#ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
+        struct irq_data         irq_data;
+#else
+        /*
+         * This union will go away, once we fixed the direct access to
+         * irq_desc all over the place. The direct fields are a 1:1
+         * overlay of irq_data.
+         */
+        union {
+                struct irq_data         irq_data;
+                struct {
+                        unsigned int            irq;
+                        unsigned int            node;
+                        struct irq_chip         *chip;
+                        void                    *handler_data;
+                        void                    *chip_data;
+                        struct msi_desc         *msi_desc;
+#ifdef CONFIG_SMP
+                        cpumask_var_t           affinity;
+#endif
+#ifdef CONFIG_INTR_REMAP
+                        struct irq_2_iommu      *irq_2_iommu;
+#endif
+                };
+        };
+#endif
+
+        struct timer_rand_state *timer_rand_state;
+        unsigned int            *kstat_irqs;
+        irq_flow_handler_t      handle_irq;
+        struct irqaction        *action;        /* IRQ action list */
+        unsigned int            status;         /* IRQ status */
+
+        unsigned int            depth;          /* nested irq disables */
+        unsigned int            wake_depth;     /* nested wake enables */
+        unsigned int            irq_count;      /* For detecting broken IRQs */
+        unsigned long           last_unhandled; /* Aging timer for unhandled count */
+        unsigned int            irqs_unhandled;
+        raw_spinlock_t          lock;
+#ifdef CONFIG_SMP
+        const struct cpumask    *affinity_hint;
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        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
+        const char              *name;
+} ____cacheline_internodealigned_in_smp;
+
+extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
+                                        struct irq_desc *desc, int node);
+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];
+#endif
+
+#ifdef CONFIG_NUMA_IRQ_DESC
+extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
+#else
+static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
+{
+        return desc;
+}
+#endif
+
+extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
+
+#ifdef CONFIG_GENERIC_HARDIRQS
+
+#define get_irq_desc_chip(desc)         ((desc)->irq_data.chip)
+#define get_irq_desc_chip_data(desc)    ((desc)->irq_data.chip_data)
+#define get_irq_desc_data(desc)         ((desc)->irq_data.handler_data)
+#define get_irq_desc_msi(desc)          ((desc)->irq_data.msi_desc)
+
+/*
+ * Monolithic do_IRQ implementation.
+ */
+#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
+extern unsigned int __do_IRQ(unsigned int irq);
+#endif
+
+/*
+ * Architectures call this to let the generic IRQ layer
+ * handle an interrupt. If the descriptor is attached to an
+ * irqchip-style controller then we call the ->handle_irq() handler,
+ * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
+ */
+static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
+{
+#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
+        desc->handle_irq(irq, desc);
+#else
+        if (likely(desc->handle_irq))
+                desc->handle_irq(irq, desc);
+        else
+                __do_IRQ(irq);
+#endif
+}
+
+static inline void generic_handle_irq(unsigned int irq)
+{
+        generic_handle_irq_desc(irq, irq_to_desc(irq));
+}
+
+/* Test to see if a driver has successfully requested an irq */
+static inline int irq_has_action(unsigned int irq)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        return desc->action != NULL;
+}
+
+static inline int irq_balancing_disabled(unsigned int irq)
+{
+        struct irq_desc *desc;
+
+        desc = irq_to_desc(irq);
+        return desc->status & IRQ_NO_BALANCING_MASK;
+}
+
+/* caller has locked the irq_desc and both params are valid */
+static inline void __set_irq_handler_unlocked(int irq,
+                                              irq_flow_handler_t handler)
+{
+        struct irq_desc *desc;
+
+        desc = irq_to_desc(irq);
+        desc->handle_irq = handler;
+}
+#endif
+
+#endif