Initial import

1 files changed, 672 insertions, 0 deletions

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
new file mode 100644
index 000000000..950ae4501
--- /dev/null
+++ b/include/linux/interrupt.h
@@ -0,0 +1,672 @@
+/* interrupt.h */
+#ifndef _LINUX_INTERRUPT_H
+#define _LINUX_INTERRUPT_H
+
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/bitops.h>
+#include <linux/preempt.h>
+#include <linux/cpumask.h>
+#include <linux/irqreturn.h>
+#include <linux/irqnr.h>
+#include <linux/hardirq.h>
+#include <linux/irqflags.h>
+#include <linux/hrtimer.h>
+#include <linux/kref.h>
+#include <linux/workqueue.h>
+
+#include <linux/atomic.h>
+#include <asm/ptrace.h>
+#include <asm/irq.h>
+
+/*
+ * These correspond to the IORESOURCE_IRQ_* defines in
+ * linux/ioport.h to select the interrupt line behaviour.  When
+ * requesting an interrupt without specifying a IRQF_TRIGGER, the
+ * setting should be assumed to be "as already configured", which
+ * may be as per machine or firmware initialisation.
+ */
+#define IRQF_TRIGGER_NONE	0x00000000
+#define IRQF_TRIGGER_RISING	0x00000001
+#define IRQF_TRIGGER_FALLING	0x00000002
+#define IRQF_TRIGGER_HIGH	0x00000004
+#define IRQF_TRIGGER_LOW	0x00000008
+#define IRQF_TRIGGER_MASK	(IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
+				 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
+#define IRQF_TRIGGER_PROBE	0x00000010
+
+/*
+ * These flags used only by the kernel as part of the
+ * irq handling routines.
+ *
+ * IRQF_SHARED - allow sharing the irq among several devices
+ * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
+ * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
+ * IRQF_PERCPU - Interrupt is per cpu
+ * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
+ * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
+ *                registered first in an shared interrupt is considered for
+ *                performance reasons)
+ * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
+ *                Used by threaded interrupts which need to keep the
+ *                irq line disabled until the threaded handler has been run.
+ * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend.  Does not guarantee
+ *                   that this interrupt will wake the system from a suspended
+ *                   state.  See Documentation/power/suspend-and-interrupts.txt
+ * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
+ * IRQF_NO_THREAD - Interrupt cannot be threaded
+ * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
+ *                resume time.
+ * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
+ *                interrupt handler after suspending interrupts. For system
+ *                wakeup devices users need to implement wakeup detection in
+ *                their interrupt handlers.
+ */
+#define IRQF_SHARED		0x00000080
+#define IRQF_PROBE_SHARED	0x00000100
+#define __IRQF_TIMER		0x00000200
+#define IRQF_PERCPU		0x00000400
+#define IRQF_NOBALANCING	0x00000800
+#define IRQF_IRQPOLL		0x00001000
+#define IRQF_ONESHOT		0x00002000
+#define IRQF_NO_SUSPEND		0x00004000
+#define IRQF_FORCE_RESUME	0x00008000
+#define IRQF_NO_THREAD		0x00010000
+#define IRQF_EARLY_RESUME	0x00020000
+#define IRQF_COND_SUSPEND	0x00040000
+
+#define IRQF_TIMER		(__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
+
+/*
+ * These values can be returned by request_any_context_irq() and
+ * describe the context the interrupt will be run in.
+ *
+ * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
+ * IRQC_IS_NESTED - interrupt runs in a nested threaded context
+ */
+enum {
+	IRQC_IS_HARDIRQ	= 0,
+	IRQC_IS_NESTED,
+};
+
+typedef irqreturn_t (*irq_handler_t)(int, void *);
+
+/**
+ * struct irqaction - per interrupt action descriptor
+ * @handler:	interrupt handler function
+ * @name:	name of the device
+ * @dev_id:	cookie to identify the device
+ * @percpu_dev_id:	cookie to identify the device
+ * @next:	pointer to the next irqaction for shared interrupts
+ * @irq:	interrupt number
+ * @flags:	flags (see IRQF_* above)
+ * @thread_fn:	interrupt handler function for threaded interrupts
+ * @thread:	thread pointer for threaded interrupts
+ * @thread_flags:	flags related to @thread
+ * @thread_mask:	bitmask for keeping track of @thread activity
+ * @dir:	pointer to the proc/irq/NN/name entry
+ */
+struct irqaction {
+	irq_handler_t		handler;
+	void			*dev_id;
+	void __percpu		*percpu_dev_id;
+	struct irqaction	*next;
+	irq_handler_t		thread_fn;
+	struct task_struct	*thread;
+	unsigned int		irq;
+	unsigned int		flags;
+	unsigned long		thread_flags;
+	unsigned long		thread_mask;
+	const char		*name;
+	struct proc_dir_entry	*dir;
+} ____cacheline_internodealigned_in_smp;
+
+extern irqreturn_t no_action(int cpl, void *dev_id);
+
+extern int __must_check
+request_threaded_irq(unsigned int irq, irq_handler_t handler,
+		     irq_handler_t thread_fn,
+		     unsigned long flags, const char *name, void *dev);
+
+static inline int __must_check
+request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
+	    const char *name, void *dev)
+{
+	return request_threaded_irq(irq, handler, NULL, flags, name, dev);
+}
+
+extern int __must_check
+request_any_context_irq(unsigned int irq, irq_handler_t handler,
+			unsigned long flags, const char *name, void *dev_id);
+
+extern int __must_check
+request_percpu_irq(unsigned int irq, irq_handler_t handler,
+		   const char *devname, void __percpu *percpu_dev_id);
+
+extern void free_irq(unsigned int, void *);
+extern void free_percpu_irq(unsigned int, void __percpu *);
+
+struct device;
+
+extern int __must_check
+devm_request_threaded_irq(struct device *dev, unsigned int irq,
+			  irq_handler_t handler, irq_handler_t thread_fn,
+			  unsigned long irqflags, const char *devname,
+			  void *dev_id);
+
+static inline int __must_check
+devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
+		 unsigned long irqflags, const char *devname, void *dev_id)
+{
+	return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
+					 devname, dev_id);
+}
+
+extern int __must_check
+devm_request_any_context_irq(struct device *dev, unsigned int irq,
+		 irq_handler_t handler, unsigned long irqflags,
+		 const char *devname, void *dev_id);
+
+extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
+
+/*
+ * On lockdep we dont want to enable hardirqs in hardirq
+ * context. Use local_irq_enable_in_hardirq() to annotate
+ * kernel code that has to do this nevertheless (pretty much
+ * the only valid case is for old/broken hardware that is
+ * insanely slow).
+ *
+ * NOTE: in theory this might break fragile code that relies
+ * on hardirq delivery - in practice we dont seem to have such
+ * places left. So the only effect should be slightly increased
+ * irqs-off latencies.
+ */
+#ifdef CONFIG_LOCKDEP
+# define local_irq_enable_in_hardirq()	do { } while (0)
+#else
+# define local_irq_enable_in_hardirq()	local_irq_enable()
+#endif
+
+extern void disable_irq_nosync(unsigned int irq);
+extern bool disable_hardirq(unsigned int irq);
+extern void disable_irq(unsigned int irq);
+extern void disable_percpu_irq(unsigned int irq);
+extern void enable_irq(unsigned int irq);
+extern void enable_percpu_irq(unsigned int irq, unsigned int type);
+extern void irq_wake_thread(unsigned int irq, void *dev_id);
+
+/* The following three functions are for the core kernel use only. */
+extern void suspend_device_irqs(void);
+extern void resume_device_irqs(void);
+
+/**
+ * struct irq_affinity_notify - context for notification of IRQ affinity changes
+ * @irq:		Interrupt to which notification applies
+ * @kref:		Reference count, for internal use
+ * @work:		Work item, for internal use
+ * @notify:		Function to be called on change.  This will be
+ *			called in process context.
+ * @release:		Function to be called on release.  This will be
+ *			called in process context.  Once registered, the
+ *			structure must only be freed when this function is
+ *			called or later.
+ */
+struct irq_affinity_notify {
+	unsigned int irq;
+	struct kref kref;
+	struct work_struct work;
+	void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
+	void (*release)(struct kref *ref);
+};
+
+#if defined(CONFIG_SMP)
+
+extern cpumask_var_t irq_default_affinity;
+
+/* Internal implementation. Use the helpers below */
+extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
+			      bool force);
+
+/**
+ * irq_set_affinity - Set the irq affinity of a given irq
+ * @irq:	Interrupt to set affinity
+ * @cpumask:	cpumask
+ *
+ * Fails if cpumask does not contain an online CPU
+ */
+static inline int
+irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+	return __irq_set_affinity(irq, cpumask, false);
+}
+
+/**
+ * irq_force_affinity - Force the irq affinity of a given irq
+ * @irq:	Interrupt to set affinity
+ * @cpumask:	cpumask
+ *
+ * Same as irq_set_affinity, but without checking the mask against
+ * online cpus.
+ *
+ * Solely for low level cpu hotplug code, where we need to make per
+ * cpu interrupts affine before the cpu becomes online.
+ */
+static inline int
+irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+	return __irq_set_affinity(irq, cpumask, true);
+}
+
+extern int irq_can_set_affinity(unsigned int irq);
+extern int irq_select_affinity(unsigned int irq);
+
+extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
+
+extern int
+irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
+
+#else /* CONFIG_SMP */
+
+static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
+{
+	return -EINVAL;
+}
+
+static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+	return 0;
+}
+
+static inline int irq_can_set_affinity(unsigned int irq)
+{
+	return 0;
+}
+
+static inline int irq_select_affinity(unsigned int irq)  { return 0; }
+
+static inline int irq_set_affinity_hint(unsigned int irq,
+					const struct cpumask *m)
+{
+	return -EINVAL;
+}
+
+static inline int
+irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
+{
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
+/*
+ * Special lockdep variants of irq disabling/enabling.
+ * These should be used for locking constructs that
+ * know that a particular irq context which is disabled,
+ * and which is the only irq-context user of a lock,
+ * that it's safe to take the lock in the irq-disabled
+ * section without disabling hardirqs.
+ *
+ * On !CONFIG_LOCKDEP they are equivalent to the normal
+ * irq disable/enable methods.
+ */
+static inline void disable_irq_nosync_lockdep(unsigned int irq)
+{
+	disable_irq_nosync(irq);
+#ifdef CONFIG_LOCKDEP
+	local_irq_disable();
+#endif
+}
+
+static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
+{
+	disable_irq_nosync(irq);
+#ifdef CONFIG_LOCKDEP
+	local_irq_save(*flags);
+#endif
+}
+
+static inline void disable_irq_lockdep(unsigned int irq)
+{
+	disable_irq(irq);
+#ifdef CONFIG_LOCKDEP
+	local_irq_disable();
+#endif
+}
+
+static inline void enable_irq_lockdep(unsigned int irq)
+{
+#ifdef CONFIG_LOCKDEP
+	local_irq_enable();
+#endif
+	enable_irq(irq);
+}
+
+static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
+{
+#ifdef CONFIG_LOCKDEP
+	local_irq_restore(*flags);
+#endif
+	enable_irq(irq);
+}
+
+/* IRQ wakeup (PM) control: */
+extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
+
+static inline int enable_irq_wake(unsigned int irq)
+{
+	return irq_set_irq_wake(irq, 1);
+}
+
+static inline int disable_irq_wake(unsigned int irq)
+{
+	return irq_set_irq_wake(irq, 0);
+}
+
+/*
+ * irq_get_irqchip_state/irq_set_irqchip_state specific flags
+ */
+enum irqchip_irq_state {
+	IRQCHIP_STATE_PENDING,		/* Is interrupt pending? */
+	IRQCHIP_STATE_ACTIVE,		/* Is interrupt in progress? */
+	IRQCHIP_STATE_MASKED,		/* Is interrupt masked? */
+	IRQCHIP_STATE_LINE_LEVEL,	/* Is IRQ line high? */
+};
+
+extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
+				 bool *state);
+extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
+				 bool state);
+
+#ifdef CONFIG_IRQ_FORCED_THREADING
+extern bool force_irqthreads;
+#else
+#define force_irqthreads	(0)
+#endif
+
+#ifndef __ARCH_SET_SOFTIRQ_PENDING
+#define set_softirq_pending(x) (local_softirq_pending() = (x))
+#define or_softirq_pending(x)  (local_softirq_pending() |= (x))
+#endif
+
+/* Some architectures might implement lazy enabling/disabling of
+ * interrupts. In some cases, such as stop_machine, we might want
+ * to ensure that after a local_irq_disable(), interrupts have
+ * really been disabled in hardware. Such architectures need to
+ * implement the following hook.
+ */
+#ifndef hard_irq_disable
+#define hard_irq_disable()	do { } while(0)
+#endif
+
+/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
+   frequency threaded job scheduling. For almost all the purposes
+   tasklets are more than enough. F.e. all serial device BHs et
+   al. should be converted to tasklets, not to softirqs.
+ */
+
+enum
+{
+	HI_SOFTIRQ=0,
+	TIMER_SOFTIRQ,
+	NET_TX_SOFTIRQ,
+	NET_RX_SOFTIRQ,
+	BLOCK_SOFTIRQ,
+	BLOCK_IOPOLL_SOFTIRQ,
+	TASKLET_SOFTIRQ,
+	SCHED_SOFTIRQ,
+	HRTIMER_SOFTIRQ,
+	RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
+
+	NR_SOFTIRQS
+};
+
+#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
+
+/* map softirq index to softirq name. update 'softirq_to_name' in
+ * kernel/softirq.c when adding a new softirq.
+ */
+extern const char * const softirq_to_name[NR_SOFTIRQS];
+
+/* softirq mask and active fields moved to irq_cpustat_t in
+ * asm/hardirq.h to get better cache usage.  KAO
+ */
+
+struct softirq_action
+{
+	void	(*action)(struct softirq_action *);
+};
+
+asmlinkage void do_softirq(void);
+asmlinkage void __do_softirq(void);
+
+#ifdef __ARCH_HAS_DO_SOFTIRQ
+void do_softirq_own_stack(void);
+#else
+static inline void do_softirq_own_stack(void)
+{
+	__do_softirq();
+}
+#endif
+
+extern void open_softirq(int nr, void (*action)(struct softirq_action *));
+extern void softirq_init(void);
+extern void __raise_softirq_irqoff(unsigned int nr);
+
+extern void raise_softirq_irqoff(unsigned int nr);
+extern void raise_softirq(unsigned int nr);
+
+DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
+
+static inline struct task_struct *this_cpu_ksoftirqd(void)
+{
+	return this_cpu_read(ksoftirqd);
+}
+
+/* Tasklets --- multithreaded analogue of BHs.
+
+   Main feature differing them of generic softirqs: tasklet
+   is running only on one CPU simultaneously.
+
+   Main feature differing them of BHs: different tasklets
+   may be run simultaneously on different CPUs.
+
+   Properties:
+   * If tasklet_schedule() is called, then tasklet is guaranteed
+     to be executed on some cpu at least once after this.
+   * If the tasklet is already scheduled, but its execution is still not
+     started, it will be executed only once.
+   * If this tasklet is already running on another CPU (or schedule is called
+     from tasklet itself), it is rescheduled for later.
+   * Tasklet is strictly serialized wrt itself, but not
+     wrt another tasklets. If client needs some intertask synchronization,
+     he makes it with spinlocks.
+ */
+
+struct tasklet_struct
+{
+	struct tasklet_struct *next;
+	unsigned long state;
+	atomic_t count;
+	void (*func)(unsigned long);
+	unsigned long data;
+};
+
+#define DECLARE_TASKLET(name, func, data) \
+struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
+
+#define DECLARE_TASKLET_DISABLED(name, func, data) \
+struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
+
+
+enum
+{
+	TASKLET_STATE_SCHED,	/* Tasklet is scheduled for execution */
+	TASKLET_STATE_RUN	/* Tasklet is running (SMP only) */
+};
+
+#ifdef CONFIG_SMP
+static inline int tasklet_trylock(struct tasklet_struct *t)
+{
+	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
+}
+
+static inline void tasklet_unlock(struct tasklet_struct *t)
+{
+	smp_mb__before_atomic();
+	clear_bit(TASKLET_STATE_RUN, &(t)->state);
+}
+
+static inline void tasklet_unlock_wait(struct tasklet_struct *t)
+{
+	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
+}
+#else
+#define tasklet_trylock(t) 1
+#define tasklet_unlock_wait(t) do { } while (0)
+#define tasklet_unlock(t) do { } while (0)
+#endif
+
+extern void __tasklet_schedule(struct tasklet_struct *t);
+
+static inline void tasklet_schedule(struct tasklet_struct *t)
+{
+	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+		__tasklet_schedule(t);
+}
+
+extern void __tasklet_hi_schedule(struct tasklet_struct *t);
+
+static inline void tasklet_hi_schedule(struct tasklet_struct *t)
+{
+	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+		__tasklet_hi_schedule(t);
+}
+
+extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
+
+/*
+ * This version avoids touching any other tasklets. Needed for kmemcheck
+ * in order not to take any page faults while enqueueing this tasklet;
+ * consider VERY carefully whether you really need this or
+ * tasklet_hi_schedule()...
+ */
+static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
+{
+	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+		__tasklet_hi_schedule_first(t);
+}
+
+
+static inline void tasklet_disable_nosync(struct tasklet_struct *t)
+{
+	atomic_inc(&t->count);
+	smp_mb__after_atomic();
+}
+
+static inline void tasklet_disable(struct tasklet_struct *t)
+{
+	tasklet_disable_nosync(t);
+	tasklet_unlock_wait(t);
+	smp_mb();
+}
+
+static inline void tasklet_enable(struct tasklet_struct *t)
+{
+	smp_mb__before_atomic();
+	atomic_dec(&t->count);
+}
+
+extern void tasklet_kill(struct tasklet_struct *t);
+extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
+extern void tasklet_init(struct tasklet_struct *t,
+			 void (*func)(unsigned long), unsigned long data);
+
+struct tasklet_hrtimer {
+	struct hrtimer		timer;
+	struct tasklet_struct	tasklet;
+	enum hrtimer_restart	(*function)(struct hrtimer *);
+};
+
+extern void
+tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
+		     enum hrtimer_restart (*function)(struct hrtimer *),
+		     clockid_t which_clock, enum hrtimer_mode mode);
+
+static inline
+int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
+			  const enum hrtimer_mode mode)
+{
+	return hrtimer_start(&ttimer->timer, time, mode);
+}
+
+static inline
+void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
+{
+	hrtimer_cancel(&ttimer->timer);
+	tasklet_kill(&ttimer->tasklet);
+}
+
+/*
+ * Autoprobing for irqs:
+ *
+ * probe_irq_on() and probe_irq_off() provide robust primitives
+ * for accurate IRQ probing during kernel initialization.  They are
+ * reasonably simple to use, are not "fooled" by spurious interrupts,
+ * and, unlike other attempts at IRQ probing, they do not get hung on
+ * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
+ *
+ * For reasonably foolproof probing, use them as follows:
+ *
+ * 1. clear and/or mask the device's internal interrupt.
+ * 2. sti();
+ * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
+ * 4. enable the device and cause it to trigger an interrupt.
+ * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
+ * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
+ * 7. service the device to clear its pending interrupt.
+ * 8. loop again if paranoia is required.
+ *
+ * probe_irq_on() returns a mask of allocated irq's.
+ *
+ * probe_irq_off() takes the mask as a parameter,
+ * and returns the irq number which occurred,
+ * or zero if none occurred, or a negative irq number
+ * if more than one irq occurred.
+ */
+
+#if !defined(CONFIG_GENERIC_IRQ_PROBE) 
+static inline unsigned long probe_irq_on(void)
+{
+	return 0;
+}
+static inline int probe_irq_off(unsigned long val)
+{
+	return 0;
+}
+static inline unsigned int probe_irq_mask(unsigned long val)
+{
+	return 0;
+}
+#else
+extern unsigned long probe_irq_on(void);	/* returns 0 on failure */
+extern int probe_irq_off(unsigned long);	/* returns 0 or negative on failure */
+extern unsigned int probe_irq_mask(unsigned long);	/* returns mask of ISA interrupts */
+#endif
+
+#ifdef CONFIG_PROC_FS
+/* Initialize /proc/irq/ */
+extern void init_irq_proc(void);
+#else
+static inline void init_irq_proc(void)
+{
+}
+#endif
+
+struct seq_file;
+int show_interrupts(struct seq_file *p, void *v);
+int arch_show_interrupts(struct seq_file *p, int prec);
+
+extern int early_irq_init(void);
+extern int arch_probe_nr_irqs(void);
+extern int arch_early_irq_init(void);
+
+#endif