![Linus Torvalds](/assets/img/avatar_default.png)
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: printk: fix wrong format string iter for printk futex: comment requeue key reference semantics * 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: irq: fix cpumask memory leak on offstack cpumask kernels * 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: posix-timers: fix RLIMIT_CPU && setitimer(CPUCLOCK_PROF) posix-timers: fix RLIMIT_CPU && fork() timers: add missing kernel-doc
520 lines
15 KiB
C
520 lines
15 KiB
C
#ifndef _LINUX_IRQ_H
|
|
#define _LINUX_IRQ_H
|
|
|
|
/*
|
|
* Please do not include this file in generic code. There is currently
|
|
* no requirement for any architecture to implement anything held
|
|
* within this file.
|
|
*
|
|
* Thanks. --rmk
|
|
*/
|
|
|
|
#include <linux/smp.h>
|
|
|
|
#ifndef CONFIG_S390
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/irqreturn.h>
|
|
#include <linux/irqnr.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/wait.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_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*/
|
|
#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
|
|
|
|
#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
|
|
|
|
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 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);
|
|
#endif
|
|
/*
|
|
* For compatibility, ->typename is copied into ->name.
|
|
* Will disappear.
|
|
*/
|
|
const char *typename;
|
|
};
|
|
|
|
struct timer_rand_state;
|
|
struct irq_2_iommu;
|
|
/**
|
|
* struct irq_desc - interrupt descriptor
|
|
* @irq: interrupt number for this descriptor
|
|
* @timer_rand_state: pointer to timer rand state struct
|
|
* @kstat_irqs: irq stats per cpu
|
|
* @irq_2_iommu: iommu with this irq
|
|
* @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
|
|
* @last_unhandled: aging timer for unhandled count
|
|
* @irqs_unhandled: stats field for spurious unhandled interrupts
|
|
* @lock: locking for SMP
|
|
* @affinity: IRQ affinity on SMP
|
|
* @cpu: cpu index useful for balancing
|
|
* @pending_mask: pending rebalanced interrupts
|
|
* @threads_active: number of irqaction threads currently running
|
|
* @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
|
|
* @dir: /proc/irq/ procfs entry
|
|
* @name: flow handler name for /proc/interrupts output
|
|
*/
|
|
struct irq_desc {
|
|
unsigned int irq;
|
|
struct timer_rand_state *timer_rand_state;
|
|
unsigned int *kstat_irqs;
|
|
#ifdef CONFIG_INTR_REMAP
|
|
struct irq_2_iommu *irq_2_iommu;
|
|
#endif
|
|
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 long last_unhandled; /* Aging timer for unhandled count */
|
|
unsigned int irqs_unhandled;
|
|
spinlock_t lock;
|
|
#ifdef CONFIG_SMP
|
|
cpumask_var_t affinity;
|
|
unsigned int cpu;
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
cpumask_var_t pending_mask;
|
|
#endif
|
|
#endif
|
|
atomic_t threads_active;
|
|
wait_queue_head_t wait_for_threads;
|
|
#ifdef CONFIG_PROC_FS
|
|
struct proc_dir_entry *dir;
|
|
#endif
|
|
const char *name;
|
|
} ____cacheline_internodealigned_in_smp;
|
|
|
|
extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
|
|
struct irq_desc *desc, int cpu);
|
|
extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
|
|
|
|
#ifndef CONFIG_SPARSE_IRQ
|
|
extern struct irq_desc irq_desc[NR_IRQS];
|
|
#else /* CONFIG_SPARSE_IRQ */
|
|
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
|
|
#endif /* CONFIG_SPARSE_IRQ */
|
|
|
|
extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
|
|
|
|
static inline struct irq_desc *
|
|
irq_remap_to_desc(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
|
|
return irq_to_desc(irq);
|
|
#else
|
|
return desc;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Migration helpers for obsolete names, they will go away:
|
|
*/
|
|
#define hw_interrupt_type irq_chip
|
|
#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);
|
|
extern void remove_irq(unsigned int irq, struct irqaction *act);
|
|
|
|
#ifdef CONFIG_GENERIC_HARDIRQS
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
|
|
void move_native_irq(int irq);
|
|
void move_masked_irq(int irq);
|
|
|
|
#else /* CONFIG_GENERIC_PENDING_IRQ */
|
|
|
|
static inline void move_irq(int irq)
|
|
{
|
|
}
|
|
|
|
static inline void move_native_irq(int irq)
|
|
{
|
|
}
|
|
|
|
static inline void move_masked_irq(int irq)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_GENERIC_PENDING_IRQ */
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
#define move_native_irq(x)
|
|
#define move_masked_irq(x)
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
extern int no_irq_affinity;
|
|
|
|
static inline int irq_balancing_disabled(unsigned int irq)
|
|
{
|
|
struct irq_desc *desc;
|
|
|
|
desc = irq_to_desc(irq);
|
|
return desc->status & IRQ_NO_BALANCING_MASK;
|
|
}
|
|
|
|
/* Handle irq action chains: */
|
|
extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* Monolithic do_IRQ implementation.
|
|
*/
|
|
#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
|
|
extern unsigned int __do_IRQ(unsigned int irq);
|
|
#endif
|
|
|
|
/*
|
|
* Architectures call this to let the generic IRQ layer
|
|
* handle an interrupt. If the descriptor is attached to an
|
|
* irqchip-style controller then we call the ->handle_irq() handler,
|
|
* and it calls __do_IRQ() if it's attached to an irqtype-style controller.
|
|
*/
|
|
static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
|
|
desc->handle_irq(irq, desc);
|
|
#else
|
|
if (likely(desc->handle_irq))
|
|
desc->handle_irq(irq, desc);
|
|
else
|
|
__do_IRQ(irq);
|
|
#endif
|
|
}
|
|
|
|
static inline void generic_handle_irq(unsigned int irq)
|
|
{
|
|
generic_handle_irq_desc(irq, irq_to_desc(irq));
|
|
}
|
|
|
|
/* Handling of unhandled and spurious interrupts: */
|
|
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
|
|
irqreturn_t 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);
|
|
|
|
/* Checks whether the interrupt can be requested by request_irq(): */
|
|
extern int can_request_irq(unsigned int irq, unsigned long irqflags);
|
|
|
|
/* Dummy irq-chip implementations: */
|
|
extern struct irq_chip no_irq_chip;
|
|
extern struct irq_chip dummy_irq_chip;
|
|
|
|
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)
|
|
{
|
|
struct irq_desc *desc;
|
|
|
|
desc = irq_to_desc(irq);
|
|
desc->handle_irq = handler;
|
|
}
|
|
|
|
/*
|
|
* 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 void set_irq_noprobe(unsigned int irq);
|
|
extern void set_irq_probe(unsigned int irq);
|
|
|
|
/* 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 */
|
|
|
|
#ifdef CONFIG_SMP
|
|
/**
|
|
* init_alloc_desc_masks - allocate cpumasks for irq_desc
|
|
* @desc: pointer to irq_desc struct
|
|
* @cpu: cpu which will be handling the cpumasks
|
|
* @boot: true if need bootmem
|
|
*
|
|
* Allocates affinity and pending_mask cpumask if required.
|
|
* Returns true if successful (or not required).
|
|
* Side effect: affinity has all bits set, pending_mask has all bits clear.
|
|
*/
|
|
static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
|
|
bool boot)
|
|
{
|
|
int node;
|
|
|
|
if (boot) {
|
|
alloc_bootmem_cpumask_var(&desc->affinity);
|
|
cpumask_setall(desc->affinity);
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
alloc_bootmem_cpumask_var(&desc->pending_mask);
|
|
cpumask_clear(desc->pending_mask);
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
node = cpu_to_node(cpu);
|
|
|
|
if (!alloc_cpumask_var_node(&desc->affinity, GFP_ATOMIC, node))
|
|
return false;
|
|
cpumask_setall(desc->affinity);
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
if (!alloc_cpumask_var_node(&desc->pending_mask, GFP_ATOMIC, node)) {
|
|
free_cpumask_var(desc->affinity);
|
|
return false;
|
|
}
|
|
cpumask_clear(desc->pending_mask);
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* init_copy_desc_masks - copy cpumasks for irq_desc
|
|
* @old_desc: pointer to old irq_desc struct
|
|
* @new_desc: pointer to new irq_desc struct
|
|
*
|
|
* Insures affinity and pending_masks are copied to new irq_desc.
|
|
* If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
|
|
* irq_desc struct so the copy is redundant.
|
|
*/
|
|
|
|
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
|
|
struct irq_desc *new_desc)
|
|
{
|
|
#ifdef CONFIG_CPUMASKS_OFFSTACK
|
|
cpumask_copy(new_desc->affinity, old_desc->affinity);
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static inline void free_desc_masks(struct irq_desc *old_desc,
|
|
struct irq_desc *new_desc)
|
|
{
|
|
free_cpumask_var(old_desc->affinity);
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
free_cpumask_var(old_desc->pending_mask);
|
|
#endif
|
|
}
|
|
|
|
#else /* !CONFIG_SMP */
|
|
|
|
static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
|
|
bool boot)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
|
|
struct irq_desc *new_desc)
|
|
{
|
|
}
|
|
|
|
static inline void free_desc_masks(struct irq_desc *old_desc,
|
|
struct irq_desc *new_desc)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#endif /* _LINUX_IRQ_H */
|