739 строки
22 KiB
C
739 строки
22 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* interrupt.h */
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#ifndef _LINUX_INTERRUPT_H
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#define _LINUX_INTERRUPT_H
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#include <linux/kernel.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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#include <linux/preempt.h>
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#include <linux/cpumask.h>
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#include <linux/irqreturn.h>
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#include <linux/irqnr.h>
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#include <linux/hardirq.h>
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#include <linux/irqflags.h>
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#include <linux/hrtimer.h>
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#include <linux/kref.h>
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#include <linux/workqueue.h>
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#include <linux/atomic.h>
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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#include <asm/sections.h>
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/*
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* These correspond to the IORESOURCE_IRQ_* defines in
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* linux/ioport.h to select the interrupt line behaviour. When
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* requesting an interrupt without specifying a IRQF_TRIGGER, the
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* setting should be assumed to be "as already configured", which
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* may be as per machine or firmware initialisation.
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*/
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#define IRQF_TRIGGER_NONE 0x00000000
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#define IRQF_TRIGGER_RISING 0x00000001
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#define IRQF_TRIGGER_FALLING 0x00000002
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#define IRQF_TRIGGER_HIGH 0x00000004
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#define IRQF_TRIGGER_LOW 0x00000008
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#define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
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#define IRQF_TRIGGER_PROBE 0x00000010
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/*
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* These flags used only by the kernel as part of the
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* irq handling routines.
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*
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* IRQF_SHARED - allow sharing the irq among several devices
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* IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
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* IRQF_TIMER - Flag to mark this interrupt as timer interrupt
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* IRQF_PERCPU - Interrupt is per cpu
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* IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
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* IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
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* registered first in an shared interrupt is considered for
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* performance reasons)
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* IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
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* Used by threaded interrupts which need to keep the
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* irq line disabled until the threaded handler has been run.
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* IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee
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* that this interrupt will wake the system from a suspended
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* state. See Documentation/power/suspend-and-interrupts.txt
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* IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
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* IRQF_NO_THREAD - Interrupt cannot be threaded
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* IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
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* resume time.
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* IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
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* interrupt handler after suspending interrupts. For system
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* wakeup devices users need to implement wakeup detection in
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* their interrupt handlers.
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*/
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#define IRQF_SHARED 0x00000080
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#define IRQF_PROBE_SHARED 0x00000100
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#define __IRQF_TIMER 0x00000200
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#define IRQF_PERCPU 0x00000400
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#define IRQF_NOBALANCING 0x00000800
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#define IRQF_IRQPOLL 0x00001000
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#define IRQF_ONESHOT 0x00002000
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#define IRQF_NO_SUSPEND 0x00004000
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#define IRQF_FORCE_RESUME 0x00008000
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#define IRQF_NO_THREAD 0x00010000
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#define IRQF_EARLY_RESUME 0x00020000
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#define IRQF_COND_SUSPEND 0x00040000
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#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
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/*
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* These values can be returned by request_any_context_irq() and
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* describe the context the interrupt will be run in.
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*
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* IRQC_IS_HARDIRQ - interrupt runs in hardirq context
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* IRQC_IS_NESTED - interrupt runs in a nested threaded context
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*/
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enum {
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IRQC_IS_HARDIRQ = 0,
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IRQC_IS_NESTED,
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};
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typedef irqreturn_t (*irq_handler_t)(int, void *);
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/**
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* struct irqaction - per interrupt action descriptor
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* @handler: interrupt handler function
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* @name: name of the device
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* @dev_id: cookie to identify the device
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* @percpu_dev_id: cookie to identify the device
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* @next: pointer to the next irqaction for shared interrupts
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* @irq: interrupt number
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* @flags: flags (see IRQF_* above)
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* @thread_fn: interrupt handler function for threaded interrupts
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* @thread: thread pointer for threaded interrupts
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* @secondary: pointer to secondary irqaction (force threading)
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* @thread_flags: flags related to @thread
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* @thread_mask: bitmask for keeping track of @thread activity
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* @dir: pointer to the proc/irq/NN/name entry
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*/
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struct irqaction {
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irq_handler_t handler;
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void *dev_id;
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void __percpu *percpu_dev_id;
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struct irqaction *next;
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irq_handler_t thread_fn;
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struct task_struct *thread;
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struct irqaction *secondary;
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unsigned int irq;
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unsigned int flags;
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unsigned long thread_flags;
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unsigned long thread_mask;
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const char *name;
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struct proc_dir_entry *dir;
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} ____cacheline_internodealigned_in_smp;
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extern irqreturn_t no_action(int cpl, void *dev_id);
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/*
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* If a (PCI) device interrupt is not connected we set dev->irq to
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* IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we
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* can distingiush that case from other error returns.
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*
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* 0x80000000 is guaranteed to be outside the available range of interrupts
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* and easy to distinguish from other possible incorrect values.
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*/
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#define IRQ_NOTCONNECTED (1U << 31)
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extern int __must_check
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request_threaded_irq(unsigned int irq, irq_handler_t handler,
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irq_handler_t thread_fn,
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unsigned long flags, const char *name, void *dev);
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static inline int __must_check
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request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
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const char *name, void *dev)
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{
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return request_threaded_irq(irq, handler, NULL, flags, name, dev);
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}
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extern int __must_check
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request_any_context_irq(unsigned int irq, irq_handler_t handler,
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unsigned long flags, const char *name, void *dev_id);
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extern int __must_check
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__request_percpu_irq(unsigned int irq, irq_handler_t handler,
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unsigned long flags, const char *devname,
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void __percpu *percpu_dev_id);
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static inline int __must_check
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request_percpu_irq(unsigned int irq, irq_handler_t handler,
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const char *devname, void __percpu *percpu_dev_id)
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{
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return __request_percpu_irq(irq, handler, 0,
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devname, percpu_dev_id);
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}
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extern const void *free_irq(unsigned int, void *);
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extern void free_percpu_irq(unsigned int, void __percpu *);
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struct device;
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extern int __must_check
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devm_request_threaded_irq(struct device *dev, unsigned int irq,
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irq_handler_t handler, irq_handler_t thread_fn,
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unsigned long irqflags, const char *devname,
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void *dev_id);
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static inline int __must_check
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devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
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unsigned long irqflags, const char *devname, void *dev_id)
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{
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return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
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devname, dev_id);
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}
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extern int __must_check
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devm_request_any_context_irq(struct device *dev, unsigned int irq,
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irq_handler_t handler, unsigned long irqflags,
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const char *devname, void *dev_id);
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extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
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/*
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* On lockdep we dont want to enable hardirqs in hardirq
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* context. Use local_irq_enable_in_hardirq() to annotate
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* kernel code that has to do this nevertheless (pretty much
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* the only valid case is for old/broken hardware that is
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* insanely slow).
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*
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* NOTE: in theory this might break fragile code that relies
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* on hardirq delivery - in practice we dont seem to have such
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* places left. So the only effect should be slightly increased
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* irqs-off latencies.
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*/
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#ifdef CONFIG_LOCKDEP
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# define local_irq_enable_in_hardirq() do { } while (0)
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#else
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# define local_irq_enable_in_hardirq() local_irq_enable()
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#endif
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extern void disable_irq_nosync(unsigned int irq);
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extern bool disable_hardirq(unsigned int irq);
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extern void disable_irq(unsigned int irq);
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extern void disable_percpu_irq(unsigned int irq);
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extern void enable_irq(unsigned int irq);
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extern void enable_percpu_irq(unsigned int irq, unsigned int type);
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extern bool irq_percpu_is_enabled(unsigned int irq);
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extern void irq_wake_thread(unsigned int irq, void *dev_id);
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/* The following three functions are for the core kernel use only. */
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extern void suspend_device_irqs(void);
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extern void resume_device_irqs(void);
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/**
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* struct irq_affinity_notify - context for notification of IRQ affinity changes
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* @irq: Interrupt to which notification applies
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* @kref: Reference count, for internal use
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* @work: Work item, for internal use
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* @notify: Function to be called on change. This will be
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* called in process context.
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* @release: Function to be called on release. This will be
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* called in process context. Once registered, the
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* structure must only be freed when this function is
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* called or later.
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*/
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struct irq_affinity_notify {
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unsigned int irq;
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struct kref kref;
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struct work_struct work;
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void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
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void (*release)(struct kref *ref);
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};
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/**
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* struct irq_affinity - Description for automatic irq affinity assignements
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* @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
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* the MSI(-X) vector space
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* @post_vectors: Don't apply affinity to @post_vectors at end of
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* the MSI(-X) vector space
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*/
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struct irq_affinity {
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int pre_vectors;
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int post_vectors;
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};
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#if defined(CONFIG_SMP)
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extern cpumask_var_t irq_default_affinity;
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/* Internal implementation. Use the helpers below */
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extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
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bool force);
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/**
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* irq_set_affinity - Set the irq affinity of a given irq
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* @irq: Interrupt to set affinity
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* @cpumask: cpumask
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*
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* Fails if cpumask does not contain an online CPU
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*/
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static inline int
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irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
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{
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return __irq_set_affinity(irq, cpumask, false);
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}
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/**
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* irq_force_affinity - Force the irq affinity of a given irq
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* @irq: Interrupt to set affinity
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* @cpumask: cpumask
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*
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* Same as irq_set_affinity, but without checking the mask against
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* online cpus.
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*
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* Solely for low level cpu hotplug code, where we need to make per
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* cpu interrupts affine before the cpu becomes online.
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*/
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static inline int
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irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
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{
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return __irq_set_affinity(irq, cpumask, true);
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}
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extern int irq_can_set_affinity(unsigned int irq);
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extern int irq_select_affinity(unsigned int irq);
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extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
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extern int
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irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
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struct cpumask *irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
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int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);
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#else /* CONFIG_SMP */
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static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
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{
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return -EINVAL;
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}
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static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
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{
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return 0;
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}
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static inline int irq_can_set_affinity(unsigned int irq)
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{
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return 0;
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}
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static inline int irq_select_affinity(unsigned int irq) { return 0; }
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static inline int irq_set_affinity_hint(unsigned int irq,
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const struct cpumask *m)
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{
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return -EINVAL;
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}
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static inline int
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irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
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{
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return 0;
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}
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static inline struct cpumask *
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irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
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{
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return NULL;
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}
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static inline int
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irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
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{
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return maxvec;
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}
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#endif /* CONFIG_SMP */
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/*
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* Special lockdep variants of irq disabling/enabling.
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* These should be used for locking constructs that
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* know that a particular irq context which is disabled,
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* and which is the only irq-context user of a lock,
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* that it's safe to take the lock in the irq-disabled
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* section without disabling hardirqs.
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*
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* On !CONFIG_LOCKDEP they are equivalent to the normal
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* irq disable/enable methods.
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*/
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static inline void disable_irq_nosync_lockdep(unsigned int irq)
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{
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disable_irq_nosync(irq);
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#ifdef CONFIG_LOCKDEP
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local_irq_disable();
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#endif
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}
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static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
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{
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disable_irq_nosync(irq);
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#ifdef CONFIG_LOCKDEP
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local_irq_save(*flags);
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#endif
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}
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static inline void disable_irq_lockdep(unsigned int irq)
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{
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disable_irq(irq);
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#ifdef CONFIG_LOCKDEP
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local_irq_disable();
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#endif
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}
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static inline void enable_irq_lockdep(unsigned int irq)
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{
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#ifdef CONFIG_LOCKDEP
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local_irq_enable();
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#endif
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enable_irq(irq);
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}
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static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
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{
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#ifdef CONFIG_LOCKDEP
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local_irq_restore(*flags);
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#endif
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enable_irq(irq);
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}
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/* IRQ wakeup (PM) control: */
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extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
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static inline int enable_irq_wake(unsigned int irq)
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{
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return irq_set_irq_wake(irq, 1);
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}
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static inline int disable_irq_wake(unsigned int irq)
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{
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return irq_set_irq_wake(irq, 0);
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}
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/*
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* irq_get_irqchip_state/irq_set_irqchip_state specific flags
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*/
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enum irqchip_irq_state {
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IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
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IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
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IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
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IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
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};
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extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
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bool *state);
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extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
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bool state);
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#ifdef CONFIG_IRQ_FORCED_THREADING
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extern bool force_irqthreads;
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#else
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#define force_irqthreads (0)
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#endif
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#ifndef __ARCH_SET_SOFTIRQ_PENDING
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#define set_softirq_pending(x) (local_softirq_pending() = (x))
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#define or_softirq_pending(x) (local_softirq_pending() |= (x))
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#endif
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/* Some architectures might implement lazy enabling/disabling of
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* interrupts. In some cases, such as stop_machine, we might want
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* to ensure that after a local_irq_disable(), interrupts have
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* really been disabled in hardware. Such architectures need to
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* implement the following hook.
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*/
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#ifndef hard_irq_disable
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#define hard_irq_disable() do { } while(0)
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#endif
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/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
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frequency threaded job scheduling. For almost all the purposes
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tasklets are more than enough. F.e. all serial device BHs et
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al. should be converted to tasklets, not to softirqs.
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*/
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enum
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{
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HI_SOFTIRQ=0,
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TIMER_SOFTIRQ,
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NET_TX_SOFTIRQ,
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NET_RX_SOFTIRQ,
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BLOCK_SOFTIRQ,
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IRQ_POLL_SOFTIRQ,
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TASKLET_SOFTIRQ,
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SCHED_SOFTIRQ,
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HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
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numbering. Sigh! */
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RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
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NR_SOFTIRQS
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};
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#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
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/* map softirq index to softirq name. update 'softirq_to_name' in
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* kernel/softirq.c when adding a new softirq.
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*/
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extern const char * const softirq_to_name[NR_SOFTIRQS];
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/* softirq mask and active fields moved to irq_cpustat_t in
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* asm/hardirq.h to get better cache usage. KAO
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*/
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struct softirq_action
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{
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void (*action)(struct softirq_action *);
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};
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asmlinkage void do_softirq(void);
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asmlinkage void __do_softirq(void);
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#ifdef __ARCH_HAS_DO_SOFTIRQ
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void do_softirq_own_stack(void);
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#else
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static inline void do_softirq_own_stack(void)
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{
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__do_softirq();
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}
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#endif
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extern void open_softirq(int nr, void (*action)(struct softirq_action *));
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extern void softirq_init(void);
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extern void __raise_softirq_irqoff(unsigned int nr);
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extern void raise_softirq_irqoff(unsigned int nr);
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extern void raise_softirq(unsigned int nr);
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DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
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static inline struct task_struct *this_cpu_ksoftirqd(void)
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{
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return this_cpu_read(ksoftirqd);
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}
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/* Tasklets --- multithreaded analogue of BHs.
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Main feature differing them of generic softirqs: tasklet
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is running only on one CPU simultaneously.
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Main feature differing them of BHs: different tasklets
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may be run simultaneously on different CPUs.
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Properties:
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* If tasklet_schedule() is called, then tasklet is guaranteed
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to be executed on some cpu at least once after this.
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* If the tasklet is already scheduled, but its execution is still not
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started, it will be executed only once.
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* If this tasklet is already running on another CPU (or schedule is called
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from tasklet itself), it is rescheduled for later.
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* Tasklet is strictly serialized wrt itself, but not
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wrt another tasklets. If client needs some intertask synchronization,
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he makes it with spinlocks.
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*/
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struct tasklet_struct
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{
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struct tasklet_struct *next;
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unsigned long state;
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atomic_t count;
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void (*func)(unsigned long);
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unsigned long data;
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};
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#define DECLARE_TASKLET(name, func, data) \
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struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
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#define DECLARE_TASKLET_DISABLED(name, func, data) \
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struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
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enum
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{
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TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
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TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
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};
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#ifdef CONFIG_SMP
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static inline int tasklet_trylock(struct tasklet_struct *t)
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{
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return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
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}
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static inline void tasklet_unlock(struct tasklet_struct *t)
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{
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smp_mb__before_atomic();
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clear_bit(TASKLET_STATE_RUN, &(t)->state);
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}
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static inline void tasklet_unlock_wait(struct tasklet_struct *t)
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{
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while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
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}
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#else
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#define tasklet_trylock(t) 1
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#define tasklet_unlock_wait(t) do { } while (0)
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#define tasklet_unlock(t) do { } while (0)
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#endif
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extern void __tasklet_schedule(struct tasklet_struct *t);
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static inline void tasklet_schedule(struct tasklet_struct *t)
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{
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if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
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__tasklet_schedule(t);
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}
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extern void __tasklet_hi_schedule(struct tasklet_struct *t);
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static inline void tasklet_hi_schedule(struct tasklet_struct *t)
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{
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if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
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__tasklet_hi_schedule(t);
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}
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extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
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/*
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* This version avoids touching any other tasklets. Needed for kmemcheck
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* in order not to take any page faults while enqueueing this tasklet;
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* consider VERY carefully whether you really need this or
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* tasklet_hi_schedule()...
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*/
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static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
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{
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if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
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__tasklet_hi_schedule_first(t);
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}
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static inline void tasklet_disable_nosync(struct tasklet_struct *t)
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{
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atomic_inc(&t->count);
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smp_mb__after_atomic();
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}
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static inline void tasklet_disable(struct tasklet_struct *t)
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{
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tasklet_disable_nosync(t);
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tasklet_unlock_wait(t);
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smp_mb();
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}
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static inline void tasklet_enable(struct tasklet_struct *t)
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{
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smp_mb__before_atomic();
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atomic_dec(&t->count);
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}
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extern void tasklet_kill(struct tasklet_struct *t);
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extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
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extern void tasklet_init(struct tasklet_struct *t,
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void (*func)(unsigned long), unsigned long data);
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struct tasklet_hrtimer {
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struct hrtimer timer;
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struct tasklet_struct tasklet;
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enum hrtimer_restart (*function)(struct hrtimer *);
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};
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extern void
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tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
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enum hrtimer_restart (*function)(struct hrtimer *),
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clockid_t which_clock, enum hrtimer_mode mode);
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static inline
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void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
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const enum hrtimer_mode mode)
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{
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hrtimer_start(&ttimer->timer, time, mode);
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}
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static inline
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void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
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{
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hrtimer_cancel(&ttimer->timer);
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tasklet_kill(&ttimer->tasklet);
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}
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/*
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* Autoprobing for irqs:
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*
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* probe_irq_on() and probe_irq_off() provide robust primitives
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* for accurate IRQ probing during kernel initialization. They are
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* reasonably simple to use, are not "fooled" by spurious interrupts,
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* and, unlike other attempts at IRQ probing, they do not get hung on
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* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
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*
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* For reasonably foolproof probing, use them as follows:
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*
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* 1. clear and/or mask the device's internal interrupt.
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* 2. sti();
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* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
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* 4. enable the device and cause it to trigger an interrupt.
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* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
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* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
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* 7. service the device to clear its pending interrupt.
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* 8. loop again if paranoia is required.
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*
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* probe_irq_on() returns a mask of allocated irq's.
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*
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* probe_irq_off() takes the mask as a parameter,
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* and returns the irq number which occurred,
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* or zero if none occurred, or a negative irq number
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* if more than one irq occurred.
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*/
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#if !defined(CONFIG_GENERIC_IRQ_PROBE)
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static inline unsigned long probe_irq_on(void)
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{
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return 0;
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}
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static inline int probe_irq_off(unsigned long val)
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{
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return 0;
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}
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static inline unsigned int probe_irq_mask(unsigned long val)
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{
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return 0;
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}
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#else
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extern unsigned long probe_irq_on(void); /* returns 0 on failure */
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extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
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extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
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#endif
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#ifdef CONFIG_PROC_FS
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/* Initialize /proc/irq/ */
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extern void init_irq_proc(void);
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#else
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static inline void init_irq_proc(void)
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{
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}
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#endif
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#ifdef CONFIG_IRQ_TIMINGS
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void irq_timings_enable(void);
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void irq_timings_disable(void);
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u64 irq_timings_next_event(u64 now);
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#endif
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struct seq_file;
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int show_interrupts(struct seq_file *p, void *v);
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int arch_show_interrupts(struct seq_file *p, int prec);
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extern int early_irq_init(void);
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extern int arch_probe_nr_irqs(void);
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extern int arch_early_irq_init(void);
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|
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/*
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* We want to know which function is an entrypoint of a hardirq or a softirq.
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*/
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#define __irq_entry __attribute__((__section__(".irqentry.text")))
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#define __softirq_entry \
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__attribute__((__section__(".softirqentry.text")))
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#endif
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