diff options
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/Makefile | 2 | ||||
| -rw-r--r-- | kernel/irq/autoprobe.c | 56 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 534 | ||||
| -rw-r--r-- | kernel/irq/handle.c | 143 | ||||
| -rw-r--r-- | kernel/irq/internals.h | 46 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 179 | ||||
| -rw-r--r-- | kernel/irq/migration.c | 22 | ||||
| -rw-r--r-- | kernel/irq/proc.c | 33 | ||||
| -rw-r--r-- | kernel/irq/resend.c | 78 | ||||
| -rw-r--r-- | kernel/irq/spurious.c | 49 |
10 files changed, 963 insertions, 179 deletions
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile index 9f77f50d814..1dab0ac3f79 100644 --- a/kernel/irq/Makefile +++ b/kernel/irq/Makefile @@ -1,5 +1,5 @@ -obj-y := handle.o manage.o spurious.o +obj-y := handle.o manage.o spurious.o resend.o chip.o obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c index 3467097ca61..533068cfb60 100644 --- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -11,12 +11,14 @@ #include <linux/interrupt.h> #include <linux/delay.h> +#include "internals.h" + /* * Autodetection depends on the fact that any interrupt that * comes in on to an unassigned handler will get stuck with * "IRQ_WAITING" cleared and the interrupt disabled. */ -static DECLARE_MUTEX(probe_sem); +static DEFINE_MUTEX(probing_active); /** * probe_irq_on - begin an interrupt autodetect @@ -27,11 +29,11 @@ static DECLARE_MUTEX(probe_sem); */ unsigned long probe_irq_on(void) { - unsigned long val; - irq_desc_t *desc; + struct irq_desc *desc; + unsigned long mask; unsigned int i; - down(&probe_sem); + mutex_lock(&probing_active); /* * something may have generated an irq long ago and we want to * flush such a longstanding irq before considering it as spurious. @@ -40,8 +42,21 @@ unsigned long probe_irq_on(void) desc = irq_desc + i; spin_lock_irq(&desc->lock); - if (!irq_desc[i].action) - irq_desc[i].handler->startup(i); + if (!desc->action && !(desc->status & IRQ_NOPROBE)) { + /* + * An old-style architecture might still have + * the handle_bad_irq handler there: + */ + compat_irq_chip_set_default_handler(desc); + + /* + * 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); } @@ -57,9 +72,9 @@ unsigned long probe_irq_on(void) desc = irq_desc + i; spin_lock_irq(&desc->lock); - if (!desc->action) { + if (!desc->action && !(desc->status & IRQ_NOPROBE)) { desc->status |= IRQ_AUTODETECT | IRQ_WAITING; - if (desc->handler->startup(i)) + if (desc->chip->startup(i)) desc->status |= IRQ_PENDING; } spin_unlock_irq(&desc->lock); @@ -73,11 +88,11 @@ unsigned long probe_irq_on(void) /* * Now filter out any obviously spurious interrupts */ - val = 0; + mask = 0; for (i = 0; i < NR_IRQS; i++) { - irq_desc_t *desc = irq_desc + i; unsigned int status; + desc = irq_desc + i; spin_lock_irq(&desc->lock); status = desc->status; @@ -85,17 +100,16 @@ unsigned long probe_irq_on(void) /* It triggered already - consider it spurious. */ if (!(status & IRQ_WAITING)) { desc->status = status & ~IRQ_AUTODETECT; - desc->handler->shutdown(i); + desc->chip->shutdown(i); } else if (i < 32) - val |= 1 << i; + mask |= 1 << i; } spin_unlock_irq(&desc->lock); } - return val; + return mask; } - EXPORT_SYMBOL(probe_irq_on); /** @@ -117,7 +131,7 @@ unsigned int probe_irq_mask(unsigned long val) mask = 0; for (i = 0; i < NR_IRQS; i++) { - irq_desc_t *desc = irq_desc + i; + struct irq_desc *desc = irq_desc + i; unsigned int status; spin_lock_irq(&desc->lock); @@ -128,11 +142,11 @@ unsigned int probe_irq_mask(unsigned long val) mask |= 1 << i; desc->status = status & ~IRQ_AUTODETECT; - desc->handler->shutdown(i); + desc->chip->shutdown(i); } spin_unlock_irq(&desc->lock); } - up(&probe_sem); + mutex_unlock(&probing_active); return mask & val; } @@ -160,7 +174,7 @@ int probe_irq_off(unsigned long val) int i, irq_found = 0, nr_irqs = 0; for (i = 0; i < NR_IRQS; i++) { - irq_desc_t *desc = irq_desc + i; + struct irq_desc *desc = irq_desc + i; unsigned int status; spin_lock_irq(&desc->lock); @@ -173,16 +187,16 @@ int probe_irq_off(unsigned long val) nr_irqs++; } desc->status = status & ~IRQ_AUTODETECT; - desc->handler->shutdown(i); + desc->chip->shutdown(i); } spin_unlock_irq(&desc->lock); } - up(&probe_sem); + mutex_unlock(&probing_active); if (nr_irqs > 1) irq_found = -irq_found; + return irq_found; } - EXPORT_SYMBOL(probe_irq_off); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c new file mode 100644 index 00000000000..54105bdfe20 --- /dev/null +++ b/kernel/irq/chip.c @@ -0,0 +1,534 @@ +/* + * linux/kernel/irq/chip.c + * + * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar + * Copyright (C) 2005-2006, Thomas Gleixner, Russell King + * + * This file contains the core interrupt handling code, for irq-chip + * based architectures. + * + * Detailed information is available in Documentation/DocBook/genericirq + */ + +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/kernel_stat.h> + +#include "internals.h" + +/** + * set_irq_chip - set the irq chip for an irq + * @irq: irq number + * @chip: pointer to irq chip description structure + */ +int set_irq_chip(unsigned int irq, struct irq_chip *chip) +{ + struct irq_desc *desc; + unsigned long flags; + + if (irq >= NR_IRQS) { + printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq); + WARN_ON(1); + return -EINVAL; + } + + if (!chip) + chip = &no_irq_chip; + + desc = irq_desc + irq; + spin_lock_irqsave(&desc->lock, flags); + irq_chip_set_defaults(chip); + desc->chip = chip; + /* + * For compatibility only: + */ + desc->chip = chip; + spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} +EXPORT_SYMBOL(set_irq_chip); + +/** + * set_irq_type - set the irq type for an irq + * @irq: irq number + * @type: interrupt type - see include/linux/interrupt.h + */ +int set_irq_type(unsigned int irq, unsigned int type) +{ + struct irq_desc *desc; + unsigned long flags; + int ret = -ENXIO; + + if (irq >= NR_IRQS) { + printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq); + return -ENODEV; + } + + desc = irq_desc + irq; + if (desc->chip->set_type) { + spin_lock_irqsave(&desc->lock, flags); + ret = desc->chip->set_type(irq, type); + spin_unlock_irqrestore(&desc->lock, flags); + } + return ret; +} +EXPORT_SYMBOL(set_irq_type); + +/** + * set_irq_data - set irq type data for an irq + * @irq: Interrupt number + * @data: Pointer to interrupt specific data + * + * Set the hardware irq controller data for an irq + */ +int set_irq_data(unsigned int irq, void *data) +{ + struct irq_desc *desc; + unsigned long flags; + + if (irq >= NR_IRQS) { + printk(KERN_ERR + "Trying to install controller data for IRQ%d\n", irq); + return -EINVAL; + } + + desc = irq_desc + irq; + spin_lock_irqsave(&desc->lock, flags); + desc->handler_data = data; + spin_unlock_irqrestore(&desc->lock, flags); + return 0; +} +EXPORT_SYMBOL(set_irq_data); + +/** + * set_irq_chip_data - set irq chip data for an irq + * @irq: Interrupt number + * @data: Pointer to chip specific data + * + * Set the hardware irq chip data for an irq + */ +int set_irq_chip_data(unsigned int irq, void *data) +{ + struct irq_desc *desc = irq_desc + irq; + unsigned long flags; + + if (irq >= NR_IRQS || !desc->chip) { + printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq); + return -EINVAL; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->chip_data = data; + spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} +EXPORT_SYMBOL(set_irq_chip_data); + +/* + * default enable function + */ +static void default_enable(unsigned int irq) +{ + struct irq_desc *desc = irq_desc + irq; + + desc->chip->unmask(irq); + desc->status &= ~IRQ_MASKED; +} + +/* + * default disable function + */ +static void default_disable(unsigned int irq) +{ + struct irq_desc *desc = irq_desc + irq; + + if (!(desc->status & IRQ_DELAYED_DISABLE)) + irq_desc[irq].chip->mask(irq); +} + +/* + * default startup function + */ +static unsigned int default_startup(unsigned int irq) +{ + irq_desc[irq].chip->enable(irq); + + return 0; +} + +/* + * Fixup enable/disable function pointers + */ +void irq_chip_set_defaults(struct irq_chip *chip) +{ + if (!chip->enable) + chip->enable = default_enable; + if (!chip->disable) + chip->disable = default_disable; + if (!chip->startup) + chip->startup = default_startup; + if (!chip->shutdown) + chip->shutdown = chip->disable; + if (!chip->name) + chip->name = chip->typename; +} + +static inline void mask_ack_irq(struct irq_desc *desc, int irq) +{ + if (desc->chip->mask_ack) + desc->chip->mask_ack(irq); + else { + desc->chip->mask(irq); + desc->chip->ack(irq); + } +} + +/** + * handle_simple_irq - Simple and software-decoded IRQs. + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * @regs: pointer to a register structure + * + * Simple interrupts are either sent from a demultiplexing interrupt + * handler or come from hardware, where no interrupt hardware control + * is necessary. + * + * Note: The caller is expected to handle the ack, clear, mask and + * unmask issues if necessary. + */ +void fastcall +handle_simple_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs) +{ + struct irqaction *action; + irqreturn_t action_ret; + const unsigned int cpu = smp_processor_id(); + + spin_lock(&desc->lock); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out_unlock; + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_cpu(cpu).irqs[irq]++; + + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) + goto out_unlock; + + desc->status |= IRQ_INPROGRESS; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, regs, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret, regs); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; +out_unlock: + spin_unlock(&desc->lock); +} + +/** + * handle_level_irq - Level type irq handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * @regs: pointer to a register structure + * + * Level type interrupts are active as long as the hardware line has + * the active level. This may require to mask the interrupt and unmask + * it after the associated handler has acknowledged the device, so the + * interrupt line is back to inactive. + */ +void fastcall +handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs) +{ + unsigned int cpu = smp_processor_id(); + struct irqaction *action; + irqreturn_t action_ret; + + spin_lock(&desc->lock); + mask_ack_irq(desc, irq); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out; + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_cpu(cpu).irqs[irq]++; + + /* + * If its disabled or no action available + * keep it masked and get out of here + */ + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) + goto out; + + desc->status |= IRQ_INPROGRESS; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, regs, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret, regs); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; +out: + if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) + desc->chip->unmask(irq); + spin_unlock(&desc->lock); +} + +/** + * handle_fasteoi_irq - irq handler for transparent controllers + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * @regs: pointer to a register structure + * + * Only a single callback will be issued to the chip: an ->eoi() + * call when the interrupt has been serviced. This enables support + * for modern forms of interrupt handlers, which handle the flow + * details in hardware, transparently. + */ +void fastcall +handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc, + struct pt_regs *regs) +{ + unsigned int cpu = smp_processor_id(); + struct irqaction *action; + irqreturn_t action_ret; + + spin_lock(&desc->lock); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out; + + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_cpu(cpu).irqs[irq]++; + + /* + * If its disabled or no action available + * keep it masked and get out of here + */ + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) { + desc->status |= IRQ_PENDING; + goto out; + } + + desc->status |= IRQ_INPROGRESS; + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, regs, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret, regs); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; +out: + desc->chip->eoi(irq); + + spin_unlock(&desc->lock); +} + +/** + * handle_edge_irq - edge type IRQ handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * @regs: pointer to a register structure + * + * Interrupt occures on the falling and/or rising edge of a hardware + * signal. The occurence is latched into the irq controller hardware + * and must be acked in order to be reenabled. After the ack another + * interrupt can happen on the same source even before the first one + * is handled by the assosiacted event handler. If this happens it + * might be necessary to disable (mask) the interrupt depending on the + * controller hardware. This requires to reenable the interrupt inside + * of the loop which handles the interrupts which have arrived while + * the handler was running. If all pending interrupts are handled, the + * loop is left. + */ +void fastcall +handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs) +{ + const unsigned int cpu = smp_processor_id(); + + spin_lock(&desc->lock); + + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + + /* + * If we're currently running this IRQ, or its disabled, + * we shouldn't process the IRQ. Mark it pending, handle + * the necessary masking and go out + */ + if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) || + !desc->action)) { + desc->status |= (IRQ_PENDING | IRQ_MASKED); + mask_ack_irq(desc, irq); + goto out_unlock; + } + + kstat_cpu(cpu).irqs[irq]++; + + /* Start handling the irq */ + desc->chip->ack(irq); + + /* Mark the IRQ currently in progress.*/ + desc->status |= IRQ_INPROGRESS; + + do { + struct irqaction *action = desc->action; + irqreturn_t action_ret; + + if (unlikely(!action)) { + desc->chip->mask(irq); + goto out_unlock; + } + + /* + * When another irq arrived while we were handling + * one, we could have masked the irq. + * Renable it, if it was not disabled in meantime. + */ + if (unlikely((desc->status & + (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) == + (IRQ_PENDING | IRQ_MASKED))) { + desc->chip->unmask(irq); + desc->status &= ~IRQ_MASKED; + } + + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + action_ret = handle_IRQ_event(irq, regs, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret, regs); + spin_lock(&desc->lock); + + } while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING); + + desc->status &= ~IRQ_INPROGRESS; +out_unlock: + spin_unlock(&desc->lock); +} + +#ifdef CONFIG_SMP +/** + * handle_percpu_IRQ - Per CPU local irq handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * @regs: pointer to a register structure + * + * Per CPU interrupts on SMP machines without locking requirements + */ +void fastcall +handle_percpu_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs) +{ + irqreturn_t action_ret; + + kstat_this_cpu.irqs[irq]++; + + if (desc->chip->ack) + desc->chip->ack(irq); + + action_ret = handle_IRQ_event(irq, regs, desc->action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret, regs); + + if (desc->chip->eoi) + desc->chip->eoi(irq); +} + +#endif /* CONFIG_SMP */ + +void +__set_irq_handler(unsigned int irq, + void fastcall (*handle)(unsigned int, irq_desc_t *, + struct pt_regs *), + int is_chained) +{ + struct irq_desc *desc; + unsigned long flags; + + if (irq >= NR_IRQS) { + printk(KERN_ERR + "Trying to install type control for IRQ%d\n", irq); + return; + } + + desc = irq_desc + irq; + + if (!handle) + handle = handle_bad_irq; + + if (desc->chip == &no_irq_chip) { + printk(KERN_WARNING "Trying to install %sinterrupt handler " + "for IRQ%d\n", is_chained ? "chained " : " ", irq); + /* + * Some ARM implementations install a handler for really dumb + * interrupt hardware without setting an irq_chip. This worked + * with the ARM no_irq_chip but the check in setup_irq would + * prevent us to setup the interrupt at all. Switch it to + * dummy_irq_chip for easy transition. + */ + desc->chip = &dummy_irq_chip; + } + + spin_lock_irqsave(&desc->lock, flags); + + /* Uninstall? */ + if (handle == handle_bad_irq) { + if (desc->chip != &no_irq_chip) { + desc->chip->mask(irq); + desc->chip->ack(irq); + } + desc->status |= IRQ_DISABLED; + desc->depth = 1; + } + desc->handle_irq = handle; + + if (handle != handle_bad_irq && is_chained) { + desc->status &= ~IRQ_DISABLED; + desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE; + desc->depth = 0; + desc->chip->unmask(irq); + } + spin_unlock_irqrestore(&desc->lock, flags); +} + +void +set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, + void fastcall (*handle)(unsigned int, + struct irq_desc *, + struct pt_regs *)) +{ + set_irq_chip(irq, chip); + __set_irq_handler(irq, handle, 0); +} + +/* + * Get a descriptive string for the highlevel handler, for + * /proc/interrupts output: + */ +const char * +handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *, + struct pt_regs *)) +{ + if (handle == handle_level_irq) + return "level "; + if (handle == handle_fasteoi_irq) + return "fasteoi"; + if (handle == handle_edge_irq) + return "edge "; + if (handle == handle_simple_irq) + return "simple "; +#ifdef CONFIG_SMP + if (handle == handle_percpu_irq) + return "percpu "; +#endif + if (handle == handle_bad_irq) + return "bad "; + + return NULL; +} diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 51df337b37d..aeb6e391276 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -1,9 +1,13 @@ /* * linux/kernel/irq/handle.c * - * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar + * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar + * Copyright (C) 2005-2006, Thomas Gleixner, Russell King * * This file contains the core interrupt handling code. + * + * Detailed information is available in Documentation/DocBook/genericirq + * */ #include <linux/irq.h> @@ -14,11 +18,22 @@ #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) +{ + print_irq_desc(irq, desc); + 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 * by the main code to do the right thing. Each driver-visible - * interrupt source is transparently wired to the apropriate + * interrupt source is transparently wired to the appropriate * controller. Thus drivers need not be aware of the * interrupt-controller. * @@ -28,41 +43,68 @@ * * Controller mappings for all interrupt sources: */ -irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = { +struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned = { [0 ... NR_IRQS-1] = { .status = IRQ_DISABLED, - .handler = &no_irq_type, - .lock = SPIN_LOCK_UNLOCKED + .chip = &no_irq_chip, + .handle_irq = handle_bad_irq, + .depth = 1, + .lock = SPIN_LOCK_UNLOCKED, +#ifdef CONFIG_SMP + .affinity = CPU_MASK_ALL +#endif } }; /* - * Generic 'no controller' code + * What should we do if we get a hw irq event on an illegal vector? + * Each architecture has to answer this themself. */ -static void end_none(unsigned int irq) { } -static void enable_none(unsigned int irq) { } -static void disable_none(unsigned int irq) { } -static void shutdown_none(unsigned int irq) { } -static unsigned int startup_none(unsigned int irq) { return 0; } - -static void ack_none(unsigned int irq) +static void ack_bad(unsigned int irq) { - /* - * 'what should we do if we get a hw irq event on an illegal vector'. - * each architecture has to answer this themself. - */ + print_irq_desc(irq, irq_desc + irq); ack_bad_irq(irq); } -struct hw_interrupt_type no_irq_type = { - .typename = "none", - .startup = startup_none, - .shutdown = shutdown_none, - .enable = enable_none, - .disable = disable_none, - .ack = ack_none, - .end = end_none, - .set_affinity = NULL +/* + * NOP functions + */ +static void noop(unsigned int irq) +{ +} + +static unsigned int noop_ret(unsigned int irq) +{ + return 0; +} + +/* + * Generic no controller implementation + */ +struct irq_chip no_irq_chip = { + .name = "none", + .startup = noop_ret, + .shutdown = noop, + .enable = noop, + .disable = noop, + .ack = ack_bad, + .end = noop, +}; + +/* + * Generic dummy implementation which can be used for + * real dumb interrupt sources + */ +struct irq_chip dummy_irq_chip = { + .name = "dummy", + .startup = noop_ret, + .shutdown = noop, + .enable = noop, + .disable = noop, + .ack = noop, + .mask = noop, + .unmask = noop, + .end = noop, }; /* @@ -73,15 +115,23 @@ irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) return IRQ_NONE; } -/* - * Have got an event to handle: +/** + * handle_IRQ_event - irq action chain handler + * @irq: the interrupt number + * @regs: pointer to a register structure + * @action: the interrupt action chain for this irq + * + * Handles the action chain of an irq event */ -fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, - struct irqaction *action) +irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs, + struct irqaction *action) { - int ret, retval = 0, status = 0; + irqreturn_t ret, retval = IRQ_NONE; + unsigned int status = 0; + + handle_dynamic_tick(action); - if (!(action->flags & SA_INTERRUPT)) + if (!(action->flags & IRQF_DISABLED)) local_irq_enable(); do { @@ -92,22 +142,29 @@ fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, action = action->next; } while (action); - if (status & SA_SAMPLE_RANDOM) + if (status & IRQF_SAMPLE_RANDOM) add_interrupt_randomness(irq); local_irq_disable(); return retval; } -/* - * do_IRQ handles all normal device IRQ's (the special +/** + * __do_IRQ - original all in one highlevel IRQ handler + * @irq: the interrupt number + * @regs: pointer to a register structure + * + * __do_IRQ handles all normal device IRQ's (the special * SMP cross-CPU interrupts have their own specific * handlers). + * + * This is the original x86 implementation which is used for every + * interrupt type. */ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs) { - irq_desc_t *desc = irq_desc + irq; - struct irqaction * action; + struct irq_desc *desc = irq_desc + irq; + struct irqaction *action; unsigned int status; kstat_this_cpu.irqs[irq]++; @@ -117,16 +174,16 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs) /* * No locking required for CPU-local interrupts: */ - if (desc->handler->ack) - desc->handler->ack(irq); + if (desc->chip->ack) + desc->chip->ack(irq); action_ret = handle_IRQ_event(irq, regs, desc->action); - desc->handler->end(irq); + desc->chip->end(irq); return 1; } spin_lock(&desc->lock); - if (desc->handler->ack) - desc->handler->ack(irq); + if (desc->chip->ack) + desc->chip->ack(irq); /* * REPLAY is when Linux resends an IRQ that was dropped earlier * WAITING is used by probe to mark irqs that are being tested @@ -186,7 +243,7 @@ out: * The ->end() handler has to deal with interrupts which got * disabled while the handler was running. */ - desc->handler->end(irq); + desc->chip->end(irq); spin_unlock(&desc->lock); return 1; diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 46feba63026..08a849a2244 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); @@ -16,3 +22,43 @@ static inline void unregister_handler_proc(unsigned int irq, struct irqaction *action) { } #endif +/* + * Debugging printout: + */ + +#include <linux/kallsyms.h> + +#define P(f) if (desc->status & f) printk("%14s set\n", #f) + +static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) +{ + printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", + irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); + printk("->handle_irq(): %p, ", desc->handle_irq); + print_symbol("%s\n", (unsigned long)desc->handle_irq); + printk("->chip(): %p, ", desc->chip); + print_symbol("%s\n", (unsigned long)desc->chip); + printk("->action(): %p\n", desc->action); + if (desc->action) { + printk("->action->handler(): %p, ", desc->action->handler); + print_symbol("%s\n", (unsigned long)desc->action->handler); + } + + P(IRQ_INPROGRESS); + P(IRQ_DISABLED); + P(IRQ_PENDING); + P(IRQ_REPLAY); + P(IRQ_AUTODETECT); + P(IRQ_WAITING); + P(IRQ_LEVEL); + P(IRQ_MASKED); +#ifdef CONFIG_IRQ_PER_CPU + P(IRQ_PER_CPU); +#endif + P(IRQ_NOPROBE); + P(IRQ_NOREQUEST); + P(IRQ_NOAUTOEN); +} + +#undef P + diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 1279e349953..c911c6ec4dd 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1,12 +1,12 @@ /* * linux/kernel/irq/manage.c * - * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar + * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar + * Copyright (C) 2005-2006 Thomas Gleixner * * This file contains driver APIs to the irq subsystem. */ -#include <linux/config.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/random.h> @@ -16,12 +16,6 @@ #ifdef CONFIG_SMP -cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL }; - -#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE) -cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS]; -#endif - /** * synchronize_irq - wait for pending IRQ handlers (on other CPUs) * @irq: interrupt number to wait for @@ -42,7 +36,6 @@ void synchronize_irq(unsigned int irq) while (desc->status & IRQ_INPROGRESS) cpu_relax(); } - EXPORT_SYMBOL(synchronize_irq); #endif @@ -60,7 +53,7 @@ EXPORT_SYMBOL(synchronize_irq); */ void disable_irq_nosync(unsigned int irq) { - irq_desc_t *desc = irq_desc + irq; + struct irq_desc *desc = irq_desc + irq; unsigned long flags; if (irq >= NR_IRQS) @@ -69,11 +62,10 @@ void disable_irq_nosync(unsigned int irq) spin_lock_irqsave(&desc->lock, flags); if (!desc->depth++) { desc->status |= IRQ_DISABLED; - desc->handler->disable(irq); + desc->chip->disable(irq); } spin_unlock_irqrestore(&desc->lock, flags); } - EXPORT_SYMBOL(disable_irq_nosync); /** @@ -90,7 +82,7 @@ EXPORT_SYMBOL(disable_irq_nosync); */ void disable_irq(unsigned int irq) { - irq_desc_t *desc = irq_desc + irq; + struct irq_desc *desc = irq_desc + irq; if (irq >= NR_IRQS) return; @@ -99,7 +91,6 @@ void disable_irq(unsigned int irq) if (desc->action) synchronize_irq(irq); } - EXPORT_SYMBOL(disable_irq); /** @@ -114,7 +105,7 @@ EXPORT_SYMBOL(disable_irq); */ void enable_irq(unsigned int irq) { - irq_desc_t *desc = irq_desc + irq; + struct irq_desc *desc = irq_desc + irq; unsigned long flags; if (irq >= NR_IRQS) @@ -123,17 +114,15 @@ void enable_irq(unsigned int irq) spin_lock_irqsave(&desc->lock, flags); switch (desc->depth) { case 0: + printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); WARN_ON(1); break; case 1: { unsigned int status = desc->status & ~IRQ_DISABLED; - desc->status = status; - if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { - desc->status = status | IRQ_REPLAY; - hw_resend_irq(desc->handler,irq); - } - desc->handler->enable(irq); + /* Prevent probing on this irq: */ + desc->status = status | IRQ_NOPROBE; + check_irq_resend(desc, irq); /* fall-through */ } default: @@ -141,9 +130,29 @@ void enable_irq(unsigned int irq) } spin_unlock_irqrestore(&desc->lock, flags); } - EXPORT_SYMBOL(enable_irq); +/** + * set_irq_wake - control irq power management wakeup + * @irq: interrupt to control + * @on: enable/disable power management wakeup + * + * Enable/disable power management wakeup mode + */ +int set_irq_wake(unsigned int irq, unsigned int on) +{ + struct irq_desc *desc = irq_desc + irq; + unsigned long flags; + int ret = -ENXIO; + + spin_lock_irqsave(&desc->lock, flags); + if (desc->chip->set_wake) + ret = desc->chip->set_wake(irq, on); + spin_unlock_irqrestore(&desc->lock, flags); + return ret; +} +EXPORT_SYMBOL(set_irq_wake); + /* * Internal function that tells the architecture code whether a * particular irq has been exclusively allocated or is available @@ -153 |