diff options
| -rw-r--r-- | include/linux/irq.h | 160 | ||||
| -rw-r--r-- | kernel/irq/autoprobe.c | 9 | ||||
| -rw-r--r-- | kernel/irq/handle.c | 10 | ||||
| -rw-r--r-- | kernel/irq/internals.h | 6 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 14 | ||||
| -rw-r--r-- | kernel/irq/resend.c | 4 | ||||
| -rw-r--r-- | kernel/irq/spurious.c | 1 |
7 files changed, 182 insertions, 22 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 14d7e94048d..437f2c635db 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -43,20 +43,36 @@ #define IRQ_NOPROBE 512 /* IRQ is not valid for probing */ #define IRQ_NOREQUEST 1024 /* IRQ cannot be requested */ #define IRQ_NOAUTOEN 2048 /* IRQ will not be enabled on request irq */ +#define IRQ_DELAYED_DISABLE \ + 4096 /* IRQ disable (masking) happens delayed. */ + +/* + * IRQ types, see also include/linux/interrupt.h + */ +#define IRQ_TYPE_NONE 0x0000 /* Default, unspecified type */ +#define IRQ_TYPE_EDGE_RISING 0x0001 /* Edge rising type */ +#define IRQ_TYPE_EDGE_FALLING 0x0002 /* Edge falling type */ +#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) +#define IRQ_TYPE_LEVEL_HIGH 0x0004 /* Level high type */ +#define IRQ_TYPE_LEVEL_LOW 0x0008 /* Level low type */ +#define IRQ_TYPE_SIMPLE 0x0010 /* Simple type */ +#define IRQ_TYPE_PERCPU 0x0020 /* Per CPU type */ +#define IRQ_TYPE_PROBE 0x0040 /* Probing in progress */ + +struct proc_dir_entry; + /** - * struct hw_interrupt_type - hardware interrupt type descriptor + * 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) - * @handle_irq: irq flow handler called from the arch IRQ glue code * @ack: start of a new interrupt * @mask: mask an interrupt source * @mask_ack: ack and mask an interrupt source * @unmask: unmask an interrupt source - * @hold: same interrupt while the handler is running * @end: end of interrupt * @set_affinity: set the CPU affinity on SMP machines * @retrigger: resend an IRQ to the CPU @@ -64,33 +80,45 @@ * @set_wake: enable/disable power-management wake-on of an IRQ * * @release: release function solely used by UML + * @typename: obsoleted by name, kept as migration helper */ -struct hw_interrupt_type { - const char *typename; +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 (*end)(unsigned int irq); void (*set_affinity)(unsigned int irq, cpumask_t 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; }; -typedef struct hw_interrupt_type hw_irq_controller; - -struct proc_dir_entry; - /** * struct irq_desc - interrupt descriptor * - * @handler: interrupt type dependent handler functions - * @handler_data: data for the type handlers + * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] + * @chip: low level interrupt hardware access + * @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 @@ -98,6 +126,7 @@ struct proc_dir_entry; * @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 * @move_irq: need to re-target IRQ destination * @dir: /proc/irq/ procfs entry @@ -106,16 +135,22 @@ struct proc_dir_entry; * Pad this out to 32 bytes for cache and indexing reasons. */ struct irq_desc { - hw_irq_controller *chip; + void fastcall (*handle_irq)(unsigned int irq, + struct irq_desc *desc, + struct pt_regs *regs); + struct irq_chip *chip; + 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 irq_count; /* For detecting broken IRQs */ unsigned int irqs_unhandled; spinlock_t lock; #ifdef CONFIG_SMP cpumask_t affinity; + unsigned int cpu; #endif #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) cpumask_t pending_mask; @@ -131,6 +166,9 @@ extern struct irq_desc irq_desc[NR_IRQS]; /* * Migration helpers for obsolete names, they will go away: */ +#define hw_interrupt_type irq_chip +typedef struct irq_chip hw_irq_controller; +#define no_irq_type no_irq_chip typedef struct irq_desc irq_desc_t; /* @@ -138,6 +176,17 @@ typedef struct irq_desc irq_desc_t; */ #include <asm/hw_irq.h> +/* + * Architectures call this to let the generic IRQ layer + * handle an interrupt: + */ +static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs) +{ + struct irq_desc *desc = irq_desc + irq; + + desc->handle_irq(irq, desc, regs); +} + extern int setup_irq(unsigned int irq, struct irqaction *new); #ifdef CONFIG_GENERIC_HARDIRQS @@ -236,27 +285,100 @@ static inline int select_smp_affinity(unsigned int irq) #endif extern int no_irq_affinity; -extern int noirqdebug_setup(char *str); -extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs, - struct irqaction *action); +/* Handle irq action chains: */ +extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, + struct irqaction *action); + +/* + * Built-in IRQ handlers for various IRQ types, + * callable via desc->chip->handle_irq() + */ +extern void fastcall +handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); +extern void fastcall +handle_fastack_irq(unsigned int irq, struct irq_desc *desc, + struct pt_regs *regs); +extern void fastcall +handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); +extern void fastcall +handle_simple_irq(unsigned int irq, struct irq_desc *desc, + struct pt_regs *regs); +extern void fastcall +handle_percpu_irq(unsigned int irq, struct irq_desc *desc, + struct pt_regs *regs); +extern void fastcall +handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); + +/* + * Get a descriptive string for the highlevel handler, for + * /proc/interrupts output: + */ +extern const char * +handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *, + struct pt_regs *)); + /* - * Explicit fastcall, because i386 4KSTACKS calls it from assembly: + * Monolithic do_IRQ implementation. + * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly) */ extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs); +/* Handling of unhandled and spurious interrupts: */ extern void note_interrupt(unsigned int irq, struct irq_desc *desc, int action_ret, struct pt_regs *regs); -extern int can_request_irq(unsigned int irq, unsigned long irqflags); /* Resending of interrupts :*/ void check_irq_resend(struct irq_desc *desc, unsigned int irq); +/* Initialize /proc/irq/ */ extern void init_irq_proc(void); -#endif /* CONFIG_GENERIC_HARDIRQS */ +/* 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 implementation: */ +extern struct irq_chip no_irq_chip; + +extern void +set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, + void fastcall (*handle)(unsigned int, + struct irq_desc *, + struct pt_regs *)); +extern void +__set_irq_handler(unsigned int irq, + void fastcall (*handle)(unsigned int, struct irq_desc *, + struct pt_regs *), + int is_chained); -extern hw_irq_controller no_irq_type; /* needed in every arch ? */ +/* + * Set a highlevel flow handler for a given IRQ: + */ +static inline void +set_irq_handler(unsigned int irq, + void fastcall (*handle)(unsigned int, struct irq_desc *, + struct pt_regs *)) +{ + __set_irq_handler(irq, handle, 0); +} + +/* + * 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, + void fastcall (*handle)(unsigned int, struct irq_desc *, + struct pt_regs *)) +{ + __set_irq_handler(irq, handle, 1); +} + +#endif /* CONFIG_GENERIC_HARDIRQS */ #endif /* !CONFIG_S390 */ diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c index ed98c7d46cf..cfdb63eb5c9 100644 --- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -40,8 +40,15 @@ unsigned long probe_irq_on(void) desc = irq_desc + i; spin_lock_irq(&desc->lock); - if (!desc->action && !(desc->status & IRQ_NOPROBE)) + if (!desc->action && !(desc->status & IRQ_NOPROBE)) { + /* + * Some chips need to know about probing in + * progress: + */ + if (desc->chip->set_type) + desc->chip->set_type(i, IRQ_TYPE_PROBE); desc->chip->startup(i); + } spin_unlock_irq(&desc->lock); } diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index bddcb8f5fea..a04b516afa5 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -18,6 +18,16 @@ #include "internals.h" +/** + * handle_bad_irq - handle spurious and unhandled irqs + */ +void fastcall +handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs) +{ + kstat_this_cpu.irqs[irq]++; + ack_bad_irq(irq); +} + /* * Linux has a controller-independent interrupt architecture. * Every controller has a 'controller-template', that is used diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 46feba63026..2ba8ae3c8e9 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -4,6 +4,12 @@ extern int noirqdebug; +/* Set default functions for irq_chip structures: */ +extern void irq_chip_set_defaults(struct irq_chip *chip); + +/* Set default handler: */ +extern void compat_irq_chip_set_default_handler(struct irq_desc *desc); + #ifdef CONFIG_PROC_FS extern void register_irq_proc(unsigned int irq); extern void register_handler_proc(unsigned int irq, struct irqaction *action); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 1a2e7663096..b61784ee78b 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -153,6 +153,17 @@ int can_request_irq(unsigned int irq, unsigned long irqflags) return !action; } +void compat_irq_chip_set_default_handler(struct irq_desc *desc) +{ + /* + * If the architecture still has not overriden + * the flow handler then zap the default. This + * should catch incorrect flow-type setting. + */ + if (desc->handle_irq == &handle_bad_irq) + desc->handle_irq = NULL; +} + /* * Internal function to register an irqaction - typically used to * allocate special interrupts that are part of the architecture. @@ -217,6 +228,9 @@ int setup_irq(unsigned int irq, struct irqaction *new) desc->status |= IRQ_PER_CPU; #endif if (!shared) { + irq_chip_set_defaults(desc->chip); + compat_irq_chip_set_default_handler(desc); + desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS); diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c index 096b102fb39..872f91ba2ce 100644 --- a/kernel/irq/resend.c +++ b/kernel/irq/resend.c @@ -37,9 +37,9 @@ static void resend_irqs(unsigned long arg) irq = find_first_bit(irqs_resend, NR_IRQS); clear_bit(irq, irqs_resend); desc = irq_desc + irq; - spin_lock_irqsave(&desc->lock, flags); + local_irq_disable(); desc->handle_irq(irq, desc, NULL); - spin_unlock_irqrestore(&desc->lock, flags); + local_irq_enable(); } } diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index 3a0a6212330..ca187b83f89 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -168,6 +168,7 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc, */ printk(KERN_EMERG "Disabling IRQ #%d\n", irq); desc->status |= IRQ_DISABLED; + desc->depth = 1; desc->chip->disable(irq); } desc->irqs_unhandled = 0; |