-#ifndef __irq_h
-#define __irq_h
+#ifndef _LINUX_IRQ_H
+#define _LINUX_IRQ_H
/*
* Please do not include this file in generic code. There is currently
#include <linux/smp.h>
-#if !defined(CONFIG_S390)
+#ifndef CONFIG_S390
#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
+#include <linux/irqnr.h>
+#include <linux/errno.h>
#include <asm/irq.h>
#include <asm/ptrace.h>
+#include <asm/irq_regs.h>
+
+struct irq_desc;
+typedef void (*irq_flow_handler_t)(unsigned int irq,
+ struct irq_desc *desc);
+
/*
* IRQ line status.
+ *
+ * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
+ *
+ * IRQ types
*/
-#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
-#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
-#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
-#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
-#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
-#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
-#define IRQ_LEVEL 64 /* IRQ level triggered */
-#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
-#if defined(ARCH_HAS_IRQ_PER_CPU)
-# define IRQ_PER_CPU 256 /* IRQ is per CPU */
+#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
+#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
+#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
+#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
+#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
+#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
+#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
+#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
+
+/* Internal flags */
+#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
+#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
+#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
+#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
+#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
+#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
+#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
+#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
+#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
+#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
+#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
+#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
+#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
+#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
+#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
+#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
+#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
+#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
+
+#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
+# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
#else
# define CHECK_IRQ_PER_CPU(var) 0
+# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
#endif
-/*
- * Interrupt controller descriptor. This is all we need
- * to describe about the low-level hardware.
+struct proc_dir_entry;
+struct msi_desc;
+
+/**
+ * struct irq_chip - hardware interrupt chip descriptor
+ *
+ * @name: name for /proc/interrupts
+ * @startup: start up the interrupt (defaults to ->enable if NULL)
+ * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
+ * @enable: enable the interrupt (defaults to chip->unmask if NULL)
+ * @disable: disable the interrupt (defaults to chip->mask if NULL)
+ * @ack: start of a new interrupt
+ * @mask: mask an interrupt source
+ * @mask_ack: ack and mask an interrupt source
+ * @unmask: unmask an interrupt source
+ * @eoi: end of interrupt - chip level
+ * @end: end of interrupt - flow level
+ * @set_affinity: set the CPU affinity on SMP machines
+ * @retrigger: resend an IRQ to the CPU
+ * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
+ * @set_wake: enable/disable power-management wake-on of an IRQ
+ *
+ * @release: release function solely used by UML
+ * @typename: obsoleted by name, kept as migration helper
*/
-struct hw_interrupt_type {
- const char * typename;
- unsigned int (*startup)(unsigned int irq);
- void (*shutdown)(unsigned int irq);
- void (*enable)(unsigned int irq);
- void (*disable)(unsigned int irq);
- void (*ack)(unsigned int irq);
- void (*end)(unsigned int irq);
- void (*set_affinity)(unsigned int irq, cpumask_t dest);
+struct irq_chip {
+ const char *name;
+ unsigned int (*startup)(unsigned int irq);
+ void (*shutdown)(unsigned int irq);
+ void (*enable)(unsigned int irq);
+ void (*disable)(unsigned int irq);
+
+ void (*ack)(unsigned int irq);
+ void (*mask)(unsigned int irq);
+ void (*mask_ack)(unsigned int irq);
+ void (*unmask)(unsigned int irq);
+ void (*eoi)(unsigned int irq);
+
+ void (*end)(unsigned int irq);
+ void (*set_affinity)(unsigned int irq,
+ const struct cpumask *dest);
+ int (*retrigger)(unsigned int irq);
+ int (*set_type)(unsigned int irq, unsigned int flow_type);
+ int (*set_wake)(unsigned int irq, unsigned int on);
+
/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
- void (*release)(unsigned int irq, void *dev_id);
+ void (*release)(unsigned int irq, void *dev_id);
#endif
+ /*
+ * For compatibility, ->typename is copied into ->name.
+ * Will disappear.
+ */
+ const char *typename;
};
-typedef struct hw_interrupt_type hw_irq_controller;
-
-/*
- * This is the "IRQ descriptor", which contains various information
- * about the irq, including what kind of hardware handling it has,
- * whether it is disabled etc etc.
- *
- * Pad this out to 32 bytes for cache and indexing reasons.
+struct timer_rand_state;
+struct irq_2_iommu;
+/**
+ * struct irq_desc - interrupt descriptor
+ * @irq: interrupt number for this descriptor
+ * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
+ * @chip: low level interrupt hardware access
+ * @msi_desc: MSI descriptor
+ * @handler_data: per-IRQ data for the irq_chip methods
+ * @chip_data: platform-specific per-chip private data for the chip
+ * methods, to allow shared chip implementations
+ * @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
+ * @irqs_unhandled: stats field for spurious unhandled interrupts
+ * @last_unhandled: aging timer for unhandled count
+ * @lock: locking for SMP
+ * @affinity: IRQ affinity on SMP
+ * @cpu: cpu index useful for balancing
+ * @pending_mask: pending rebalanced interrupts
+ * @dir: /proc/irq/ procfs entry
+ * @name: flow handler name for /proc/interrupts output
*/
-typedef struct irq_desc {
- hw_irq_controller *handler;
- void *handler_data;
- struct irqaction *action; /* IRQ action list */
- unsigned int status; /* IRQ status */
- unsigned int depth; /* nested irq disables */
- unsigned int irq_count; /* For detecting broken interrupts */
- unsigned int irqs_unhandled;
- spinlock_t lock;
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
- unsigned int move_irq; /* Flag need to re-target intr dest*/
+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
-} ____cacheline_aligned irq_desc_t;
+ irq_flow_handler_t handle_irq;
+ struct irq_chip *chip;
+ struct msi_desc *msi_desc;
+ void *handler_data;
+ void *chip_data;
+ 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 int irqs_unhandled;
+ unsigned long last_unhandled; /* Aging timer for unhandled count */
+ spinlock_t lock;
+#ifdef CONFIG_SMP
+ cpumask_t affinity;
+ unsigned int cpu;
+#endif
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+ cpumask_t pending_mask;
+#endif
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *dir;
+#endif
+ 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);
-extern irq_desc_t irq_desc [NR_IRQS];
+#ifndef CONFIG_SPARSE_IRQ
+extern struct irq_desc irq_desc[NR_IRQS];
-/* Return a pointer to the irq descriptor for IRQ. */
-static inline irq_desc_t *
-irq_descp (int irq)
+static inline struct irq_desc *irq_to_desc(unsigned int irq)
{
- return irq_desc + irq;
+ 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);
}
-#include <asm/hw_irq.h> /* the arch dependent stuff */
+#else
-extern int setup_irq(unsigned int irq, struct irqaction * new);
+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);
-#ifdef CONFIG_GENERIC_HARDIRQS
-extern cpumask_t irq_affinity[NR_IRQS];
+# 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()]++)
-#ifdef CONFIG_SMP
-static inline void set_native_irq_info(int irq, cpumask_t mask)
-{
- irq_affinity[irq] = mask;
-}
-#else
-static inline void set_native_irq_info(int irq, cpumask_t mask)
-{
-}
#endif
+/*
+ * Migration helpers for obsolete names, they will go away:
+ */
+#define hw_interrupt_type irq_chip
+typedef struct irq_chip hw_irq_controller;
+#define no_irq_type no_irq_chip
+typedef struct irq_desc irq_desc_t;
+
+/*
+ * Pick up the arch-dependent methods:
+ */
+#include <asm/hw_irq.h>
+
+extern int setup_irq(unsigned int irq, struct irqaction *new);
+
+#ifdef CONFIG_GENERIC_HARDIRQS
+
#ifdef CONFIG_SMP
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-extern cpumask_t pending_irq_cpumask[NR_IRQS];
+#ifdef CONFIG_GENERIC_PENDING_IRQ
-void set_pending_irq(unsigned int irq, cpumask_t mask);
void move_native_irq(int irq);
+void move_masked_irq(int irq);
+
+#else /* CONFIG_GENERIC_PENDING_IRQ */
-#ifdef CONFIG_PCI_MSI
-/*
- * Wonder why these are dummies?
- * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
- * counter part after translating the vector to irq info. We need to perform
- * this operation on the real irq, when we dont use vector, i.e when
- * pci_use_vector() is false.
- */
static inline void move_irq(int irq)
{
}
-static inline void set_irq_info(int irq, cpumask_t mask)
+static inline void move_native_irq(int irq)
{
}
-#else // CONFIG_PCI_MSI
-
-static inline void move_irq(int irq)
+static inline void move_masked_irq(int irq)
{
- move_native_irq(irq);
}
-static inline void set_irq_info(int irq, cpumask_t mask)
-{
- set_native_irq_info(irq, mask);
-}
-#endif // CONFIG_PCI_MSI
+#endif /* CONFIG_GENERIC_PENDING_IRQ */
-#else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
+#else /* CONFIG_SMP */
-#define move_irq(x)
#define move_native_irq(x)
-#define set_pending_irq(x,y)
-static inline void set_irq_info(int irq, cpumask_t mask)
+#define move_masked_irq(x)
+
+#endif /* CONFIG_SMP */
+
+extern int no_irq_affinity;
+
+static inline int irq_balancing_disabled(unsigned int irq)
{
- set_native_irq_info(irq, mask);
-}
+ struct irq_desc *desc;
-#endif // CONFIG_GENERIC_PENDING_IRQ
+ desc = irq_to_desc(irq);
+ return desc->status & IRQ_NO_BALANCING_MASK;
+}
-#else // CONFIG_SMP
+/* Handle irq action chains: */
+extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
-#define move_irq(x)
-#define move_native_irq(x)
+/*
+ * Built-in IRQ handlers for various IRQ types,
+ * callable via desc->chip->handle_irq()
+ */
+extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
+extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
-#endif // CONFIG_SMP
+/*
+ * Monolithic do_IRQ implementation.
+ */
+#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
+extern unsigned int __do_IRQ(unsigned int irq);
+#endif
-#ifdef CONFIG_IRQBALANCE
-extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
+/*
+ * 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
-static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
+ 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));
}
-#endif
-extern int no_irq_affinity;
+/* Handling of unhandled and spurious interrupts: */
+extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
+ int action_ret);
+
+/* Resending of interrupts :*/
+void check_irq_resend(struct irq_desc *desc, unsigned int irq);
+
+/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);
-extern fastcall irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
- struct irqaction *action);
-extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
-extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
- int action_ret, struct pt_regs *regs);
+/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);
-extern void init_irq_proc(void);
+/* Dummy irq-chip implementations: */
+extern struct irq_chip no_irq_chip;
+extern struct irq_chip dummy_irq_chip;
-#ifdef CONFIG_AUTO_IRQ_AFFINITY
-extern int select_smp_affinity(unsigned int irq);
-#else
-static inline int
-select_smp_affinity(unsigned int irq)
+extern void
+set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
+ irq_flow_handler_t handle);
+extern void
+set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
+ irq_flow_handler_t handle, const char *name);
+
+extern void
+__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
+ const char *name);
+
+/* 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)
{
- return 1;
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ desc->handle_irq = handler;
}
-#endif
-#endif
+/*
+ * Set a highlevel flow handler for a given IRQ:
+ */
+static inline void
+set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
+{
+ __set_irq_handler(irq, handle, 0, NULL);
+}
+
+/*
+ * Set a highlevel chained flow handler for a given IRQ.
+ * (a chained handler is automatically enabled and set to
+ * IRQ_NOREQUEST and IRQ_NOPROBE)
+ */
+static inline void
+set_irq_chained_handler(unsigned int irq,
+ irq_flow_handler_t handle)
+{
+ __set_irq_handler(irq, handle, 1, NULL);
+}
-extern hw_irq_controller no_irq_type; /* needed in every arch ? */
+extern void set_irq_noprobe(unsigned int irq);
+extern void set_irq_probe(unsigned int irq);
-#endif
+/* Handle dynamic irq creation and destruction */
+extern unsigned int create_irq_nr(unsigned int irq_want);
+extern int create_irq(void);
+extern void destroy_irq(unsigned int 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;
+}
+
+/* Dynamic irq helper functions */
+extern void dynamic_irq_init(unsigned int irq);
+extern void dynamic_irq_cleanup(unsigned int irq);
+
+/* Set/get chip/data for an IRQ: */
+extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
+extern int set_irq_data(unsigned int irq, void *data);
+extern int set_irq_chip_data(unsigned int irq, void *data);
+extern int set_irq_type(unsigned int irq, unsigned int type);
+extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
+
+#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
+#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
+#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 */
-#endif /* __irq_h */
+#endif /* _LINUX_IRQ_H */
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