diff options
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 593 |
1 files changed, 403 insertions, 190 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 2782bacdf494..acd599a43bfb 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -17,6 +17,17 @@ #include "internals.h" +#ifdef CONFIG_IRQ_FORCED_THREADING +__read_mostly bool force_irqthreads; + +static int __init setup_forced_irqthreads(char *arg) +{ + force_irqthreads = true; + return 0; +} +early_param("threadirqs", setup_forced_irqthreads); +#endif + /** * synchronize_irq - wait for pending IRQ handlers (on other CPUs) * @irq: interrupt number to wait for @@ -30,7 +41,7 @@ void synchronize_irq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); - unsigned int status; + unsigned int state; if (!desc) return; @@ -42,16 +53,16 @@ void synchronize_irq(unsigned int irq) * Wait until we're out of the critical section. This might * give the wrong answer due to the lack of memory barriers. */ - while (desc->status & IRQ_INPROGRESS) + while (desc->istate & IRQS_INPROGRESS) cpu_relax(); /* Ok, that indicated we're done: double-check carefully. */ raw_spin_lock_irqsave(&desc->lock, flags); - status = desc->status; + state = desc->istate; raw_spin_unlock_irqrestore(&desc->lock, flags); /* Oops, that failed? */ - } while (status & IRQ_INPROGRESS); + } while (state & IRQS_INPROGRESS); /* * We made sure that no hardirq handler is running. Now verify @@ -73,8 +84,8 @@ int irq_can_set_affinity(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); - if (CHECK_IRQ_PER_CPU(desc->status) || !desc->irq_data.chip || - !desc->irq_data.chip->irq_set_affinity) + if (!desc || !irqd_can_balance(&desc->irq_data) || + !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) return 0; return 1; @@ -100,67 +111,169 @@ void irq_set_thread_affinity(struct irq_desc *desc) } } +#ifdef CONFIG_GENERIC_PENDING_IRQ +static inline bool irq_can_move_pcntxt(struct irq_desc *desc) +{ + return irq_settings_can_move_pcntxt(desc); +} +static inline bool irq_move_pending(struct irq_desc *desc) +{ + return irqd_is_setaffinity_pending(&desc->irq_data); +} +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) +{ + cpumask_copy(desc->pending_mask, mask); +} +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) +{ + cpumask_copy(mask, desc->pending_mask); +} +#else +static inline bool irq_can_move_pcntxt(struct irq_desc *desc) { return true; } +static inline bool irq_move_pending(struct irq_desc *desc) { return false; } +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { } +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } +#endif + /** * irq_set_affinity - Set the irq affinity of a given irq * @irq: Interrupt to set affinity * @cpumask: cpumask * */ -int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) +int irq_set_affinity(unsigned int irq, const struct cpumask *mask) { struct irq_desc *desc = irq_to_desc(irq); struct irq_chip *chip = desc->irq_data.chip; unsigned long flags; + int ret = 0; if (!chip->irq_set_affinity) return -EINVAL; raw_spin_lock_irqsave(&desc->lock, flags); -#ifdef CONFIG_GENERIC_PENDING_IRQ - if (desc->status & IRQ_MOVE_PCNTXT) { - if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) { - cpumask_copy(desc->irq_data.affinity, cpumask); + if (irq_can_move_pcntxt(desc)) { + ret = chip->irq_set_affinity(&desc->irq_data, mask, false); + switch (ret) { + case IRQ_SET_MASK_OK: + cpumask_copy(desc->irq_data.affinity, mask); + case IRQ_SET_MASK_OK_NOCOPY: irq_set_thread_affinity(desc); + ret = 0; } + } else { + irqd_set_move_pending(&desc->irq_data); + irq_copy_pending(desc, mask); } - else { - desc->status |= IRQ_MOVE_PENDING; - cpumask_copy(desc->pending_mask, cpumask); - } -#else - if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) { - cpumask_copy(desc->irq_data.affinity, cpumask); - irq_set_thread_affinity(desc); + + if (desc->affinity_notify) { + kref_get(&desc->affinity_notify->kref); + schedule_work(&desc->affinity_notify->work); } -#endif - desc->status |= IRQ_AFFINITY_SET; + irq_compat_set_affinity(desc); + irqd_set(&desc->irq_data, IRQD_AFFINITY_SET); raw_spin_unlock_irqrestore(&desc->lock, flags); - return 0; + return ret; } int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) { + unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); + + if (!desc) + return -EINVAL; + desc->affinity_hint = m; + irq_put_desc_unlock(desc, flags); + return 0; +} +EXPORT_SYMBOL_GPL(irq_set_affinity_hint); + +static void irq_affinity_notify(struct work_struct *work) +{ + struct irq_affinity_notify *notify = + container_of(work, struct irq_affinity_notify, work); + struct irq_desc *desc = irq_to_desc(notify->irq); + cpumask_var_t cpumask; + unsigned long flags; + + if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) + goto out; + + raw_spin_lock_irqsave(&desc->lock, flags); + if (irq_move_pending(desc)) + irq_get_pending(cpumask, desc); + else + cpumask_copy(cpumask, desc->irq_data.affinity); + raw_spin_unlock_irqrestore(&desc->lock, flags); + + notify->notify(notify, cpumask); + + free_cpumask_var(cpumask); +out: + kref_put(¬ify->kref, notify->release); +} + +/** + * irq_set_affinity_notifier - control notification of IRQ affinity changes + * @irq: Interrupt for which to enable/disable notification + * @notify: Context for notification, or %NULL to disable + * notification. Function pointers must be initialised; + * the other fields will be initialised by this function. + * + * Must be called in process context. Notification may only be enabled + * after the IRQ is allocated and must be disabled before the IRQ is + * freed using free_irq(). + */ +int +irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) +{ struct irq_desc *desc = irq_to_desc(irq); + struct irq_affinity_notify *old_notify; unsigned long flags; + /* The release function is promised process context */ + might_sleep(); + if (!desc) return -EINVAL; + /* Complete initialisation of *notify */ + if (notify) { + notify->irq = irq; + kref_init(¬ify->kref); + INIT_WORK(¬ify->work, irq_affinity_notify); + } + raw_spin_lock_irqsave(&desc->lock, flags); - desc->affinity_hint = m; + old_notify = desc->affinity_notify; + desc->affinity_notify = notify; raw_spin_unlock_irqrestore(&desc->lock, flags); + if (old_notify) + kref_put(&old_notify->kref, old_notify->release); + return 0; } -EXPORT_SYMBOL_GPL(irq_set_affinity_hint); +EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); #ifndef CONFIG_AUTO_IRQ_AFFINITY /* * Generic version of the affinity autoselector. */ -static int setup_affinity(unsigned int irq, struct irq_desc *desc) +static int +setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) { + struct irq_chip *chip = irq_desc_get_chip(desc); + struct cpumask *set = irq_default_affinity; + int ret; + + /* Excludes PER_CPU and NO_BALANCE interrupts */ if (!irq_can_set_affinity(irq)) return 0; @@ -168,22 +281,29 @@ static int setup_affinity(unsigned int irq, struct irq_desc *desc) * Preserve an userspace affinity setup, but make sure that * one of the targets is online. */ - if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) { - if (cpumask_any_and(desc->irq_data.affinity, cpu_online_mask) - < nr_cpu_ids) - goto set_affinity; - else - desc->status &= ~IRQ_AFFINITY_SET; + if (irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { + if (cpumask_intersects(desc->irq_data.affinity, + cpu_online_mask)) + set = desc->irq_data.affinity; + else { + irq_compat_clr_affinity(desc); + irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); + } } - cpumask_and(desc->irq_data.affinity, cpu_online_mask, irq_default_affinity); -set_affinity: - desc->irq_data.chip->irq_set_affinity(&desc->irq_data, desc->irq_data.affinity, false); - + cpumask_and(mask, cpu_online_mask, set); + ret = chip->irq_set_affinity(&desc->irq_data, mask, false); + switch (ret) { + case IRQ_SET_MASK_OK: + cpumask_copy(desc->irq_data.affinity, mask); + case IRQ_SET_MASK_OK_NOCOPY: + irq_set_thread_affinity(desc); + } return 0; } #else -static inline int setup_affinity(unsigned int irq, struct irq_desc *d) +static inline int +setup_affinity(unsigned int irq, struct irq_desc *d, struct cpumask *mask) { return irq_select_affinity(irq); } @@ -192,23 +312,21 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *d) /* * Called when affinity is set via /proc/irq */ -int irq_select_affinity_usr(unsigned int irq) +int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask) { struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; int ret; raw_spin_lock_irqsave(&desc->lock, flags); - ret = setup_affinity(irq, desc); - if (!ret) - irq_set_thread_affinity(desc); + ret = setup_affinity(irq, desc, mask); raw_spin_unlock_irqrestore(&desc->lock, flags); - return ret; } #else -static inline int setup_affinity(unsigned int irq, struct irq_desc *desc) +static inline int +setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) { return 0; } @@ -219,13 +337,23 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) if (suspend) { if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)) return; - desc->status |= IRQ_SUSPENDED; + desc->istate |= IRQS_SUSPENDED; } - if (!desc->depth++) { - desc->status |= IRQ_DISABLED; - desc->irq_data.chip->irq_disable(&desc->irq_data); - } + if (!desc->depth++) + irq_disable(desc); +} + +static int __disable_irq_nosync(unsigned int irq) +{ + unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); + + if (!desc) + return -EINVAL; + __disable_irq(desc, irq, false); + irq_put_desc_busunlock(desc, flags); + return 0; } /** @@ -241,17 +369,7 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) */ void disable_irq_nosync(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); - unsigned long flags; - - if (!desc) - return; - - chip_bus_lock(desc); - raw_spin_lock_irqsave(&desc->lock, flags); - __disable_irq(desc, irq, false); - raw_spin_unlock_irqrestore(&desc->lock, flags); - chip_bus_sync_unlock(desc); + __disable_irq_nosync(irq); } EXPORT_SYMBOL(disable_irq_nosync); @@ -269,13 +387,7 @@ EXPORT_SYMBOL(disable_irq_nosync); */ void disable_irq(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); - - if (!desc) - return; - - disable_irq_nosync(irq); - if (desc->action) + if (!__disable_irq_nosync(irq)) synchronize_irq(irq); } EXPORT_SYMBOL(disable_irq); @@ -283,7 +395,7 @@ EXPORT_SYMBOL(disable_irq); void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) { if (resume) { - if (!(desc->status & IRQ_SUSPENDED)) { + if (!(desc->istate & IRQS_SUSPENDED)) { if (!desc->action) return; if (!(desc->action->flags & IRQF_FORCE_RESUME)) @@ -291,7 +403,7 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) /* Pretend that it got disabled ! */ desc->depth++; } - desc->status &= ~IRQ_SUSPENDED; + desc->istate &= ~IRQS_SUSPENDED; } switch (desc->depth) { @@ -300,12 +412,11 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); break; case 1: { - unsigned int status = desc->status & ~IRQ_DISABLED; - - if (desc->status & IRQ_SUSPENDED) + if (desc->istate & IRQS_SUSPENDED) goto err_out; /* Prevent probing on this irq: */ - desc->status = status | IRQ_NOPROBE; + irq_settings_set_noprobe(desc); + irq_enable(desc); check_irq_resend(desc, irq); /* fall-through */ } @@ -327,21 +438,18 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) */ void enable_irq(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); if (!desc) return; + if (WARN(!desc->irq_data.chip, + KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) + goto out; - if (WARN(!desc->irq_data.chip || !desc->irq_data.chip->irq_enable, - KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) - return; - - chip_bus_lock(desc); - raw_spin_lock_irqsave(&desc->lock, flags); __enable_irq(desc, irq, false); - raw_spin_unlock_irqrestore(&desc->lock, flags); - chip_bus_sync_unlock(desc); +out: + irq_put_desc_busunlock(desc, flags); } EXPORT_SYMBOL(enable_irq); @@ -357,7 +465,7 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) } /** - * set_irq_wake - control irq power management wakeup + * irq_set_irq_wake - control irq power management wakeup * @irq: interrupt to control * @on: enable/disable power management wakeup * @@ -368,23 +476,22 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) * Wakeup mode lets this IRQ wake the system from sleep * states like "suspend to RAM". */ -int set_irq_wake(unsigned int irq, unsigned int on) +int irq_set_irq_wake(unsigned int irq, unsigned int on) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); int ret = 0; /* wakeup-capable irqs can be shared between drivers that * don't need to have the same sleep mode behaviors. */ - raw_spin_lock_irqsave(&desc->lock, flags); if (on) { if (desc->wake_depth++ == 0) { ret = set_irq_wake_real(irq, on); if (ret) desc->wake_depth = 0; else - desc->status |= IRQ_WAKEUP; + irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); } } else { if (desc->wake_depth == 0) { @@ -394,14 +501,13 @@ int set_irq_wake(unsigned int irq, unsigned int on) if (ret) desc->wake_depth = 1; else - desc->status &= ~IRQ_WAKEUP; + irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); } } - - raw_spin_unlock_irqrestore(&desc->lock, flags); + irq_put_desc_busunlock(desc, flags); return ret; } -EXPORT_SYMBOL(set_irq_wake); +EXPORT_SYMBOL(irq_set_irq_wake); /* * Internal function that tells the architecture code whether a @@ -410,43 +516,27 @@ EXPORT_SYMBOL(set_irq_wake); */ int can_request_irq(unsigned int irq, unsigned long irqflags) { - struct irq_desc *desc = irq_to_desc(irq); - struct irqaction *action; unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); + int canrequest = 0; if (!desc) return 0; - if (desc->status & IRQ_NOREQUEST) - return 0; - - raw_spin_lock_irqsave(&desc->lock, flags); - action = desc->action; - if (action) - if (irqflags & action->flags & IRQF_SHARED) - action = NULL; - - raw_spin_unlock_irqrestore(&desc->lock, flags); - - 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; + if (irq_settings_can_request(desc)) { + if (desc->action) + if (irqflags & desc->action->flags & IRQF_SHARED) + canrequest =1; + } + irq_put_desc_unlock(desc, flags); + return canrequest; } int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, unsigned long flags) { - int ret; struct irq_chip *chip = desc->irq_data.chip; + int ret, unmask = 0; if (!chip || !chip->irq_set_type) { /* @@ -458,23 +548,43 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, return 0; } + flags &= IRQ_TYPE_SENSE_MASK; + + if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { + if (!(desc->istate & IRQS_MASKED)) + mask_irq(desc); + if (!(desc->istate & IRQS_DISABLED)) + unmask = 1; + } + /* caller masked out all except trigger mode flags */ ret = chip->irq_set_type(&desc->irq_data, flags); - if (ret) - pr_err("setting trigger mode %lu for irq %u failed (%pF)\n", - flags, irq, chip->irq_set_type); - else { - if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) - flags |= IRQ_LEVEL; - /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */ - desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK); - desc->status |= flags; + switch (ret) { + case IRQ_SET_MASK_OK: + irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); + irqd_set(&desc->irq_data, flags); + + case IRQ_SET_MASK_OK_NOCOPY: + flags = irqd_get_trigger_type(&desc->irq_data); + irq_settings_set_trigger_mask(desc, flags); + irqd_clear(&desc->irq_data, IRQD_LEVEL); + irq_settings_clr_level(desc); + if (flags & IRQ_TYPE_LEVEL_MASK) { + irq_settings_set_level(desc); + irqd_set(&desc->irq_data, IRQD_LEVEL); + } if (chip != desc->irq_data.chip) irq_chip_set_defaults(desc->irq_data.chip); + ret = 0; + break; + default: + pr_err("setting trigger mode %lu for irq %u failed (%pF)\n", + flags, irq, chip->irq_set_type); } - + if (unmask) + unmask_irq(desc); return ret; } @@ -518,8 +628,11 @@ static int irq_wait_for_interrupt(struct irqaction *action) * handler finished. unmask if the interrupt has not been disabled and * is marked MASKED. */ -static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc) +static void irq_finalize_oneshot(struct irq_desc *desc, + struct irqaction *action, bool force) { + if (!(desc->istate & IRQS_ONESHOT)) + return; again: chip_bus_lock(desc); raw_spin_lock_irq(&desc->lock); @@ -531,26 +644,44 @@ again: * The thread is faster done than the hard interrupt handler * on the other CPU. If we unmask the irq line then the * interrupt can come in again and masks the line, leaves due - * to IRQ_INPROGRESS and the irq line is masked forever. + * to IRQS_INPROGRESS and the irq line is masked forever. + * + * This also serializes the state of shared oneshot handlers + * versus "desc->threads_onehsot |= action->thread_mask;" in + * irq_wake_thread(). See the comment there which explains the + * serialization. */ - if (unlikely(desc->status & IRQ_INPROGRESS)) { + if (unlikely(desc->istate & IRQS_INPROGRESS)) { raw_spin_unlock_irq(&desc->lock); chip_bus_sync_unlock(desc); cpu_relax(); goto again; } - if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) { - desc->status &= ~IRQ_MASKED; + /* + * Now check again, whether the thread should run. Otherwise + * we would clear the threads_oneshot bit of this thread which + * was just set. + */ + if (!force && test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) + goto out_unlock; + + desc->threads_oneshot &= ~action->thread_mask; + + if (!desc->threads_oneshot && !(desc->istate & IRQS_DISABLED) && + (desc->istate & IRQS_MASKED)) { + irq_compat_clr_masked(desc); + desc->istate &= ~IRQS_MASKED; desc->irq_data.chip->irq_unmask(&desc->irq_data); } +out_unlock: raw_spin_unlock_irq(&desc->lock); chip_bus_sync_unlock(desc); } #ifdef CONFIG_SMP /* - * Check whether we need to change the affinity of the interrupt thread. + * Check whether we need to chasnge the affinity of the interrupt thread. */ static void irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) @@ -582,6 +713,32 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } #endif /* + * Interrupts which are not explicitely requested as threaded + * interrupts rely on the implicit bh/preempt disable of the hard irq + * context. So we need to disable bh here to avoid deadlocks and other + * side effects. + */ +static void +irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) +{ + local_bh_disable(); + action->thread_fn(action->irq, action->dev_id); + irq_finalize_oneshot(desc, action, false); + local_bh_enable(); +} + +/* + * Interrupts explicitely requested as threaded interupts want to be + * preemtible - many of them need to sleep and wait for slow busses to + * complete. + */ +static void irq_thread_fn(struct irq_desc *desc, struct irqaction *action) +{ + action->thread_fn(action->irq, action->dev_id); + irq_finalize_oneshot(desc, action, false); +} + +/* * Interrupt handler thread */ static int irq_thread(void *data) @@ -591,7 +748,14 @@ static int irq_thread(void *data) }; struct irqaction *action = data; struct irq_desc *desc = irq_to_desc(action->irq); - int wake, oneshot = desc->status & IRQ_ONESHOT; + void (*handler_fn)(struct irq_desc *desc, struct irqaction *action); + int wake; + + if (force_irqthreads & test_bit(IRQTF_FORCED_THREAD, + &action->thread_flags)) + handler_fn = irq_forced_thread_fn; + else + handler_fn = irq_thread_fn; sched_setscheduler(current, SCHED_FIFO, ¶m); current->irqaction = action; @@ -603,23 +767,20 @@ static int irq_thread(void *data) atomic_inc(&desc->threads_active); raw_spin_lock_irq(&desc->lock); - if (unlikely(desc->status & IRQ_DISABLED)) { + if (unlikely(desc->istate & IRQS_DISABLED)) { /* * CHECKME: We might need a dedicated * IRQ_THREAD_PENDING flag here, which * retriggers the thread in check_irq_resend() - * but AFAICT IRQ_PENDING should be fine as it + * but AFAICT IRQS_PENDING should be fine as it * retriggers the interrupt itself --- tglx */ - desc->status |= IRQ_PENDING; + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; raw_spin_unlock_irq(&desc->lock); } else { raw_spin_unlock_irq(&desc->lock); - - action->thread_fn(action->irq, action->dev_id); - - if (oneshot) - irq_finalize_oneshot(action->irq, desc); + handler_fn(desc, action); } wake = atomic_dec_and_test(&desc->threads_active); @@ -628,6 +789,9 @@ static int irq_thread(void *data) wake_up(&desc->wait_for_threads); } + /* Prevent a stale desc->threads_oneshot */ + irq_finalize_oneshot(desc, action, true); + /* * Clear irqaction. Otherwise exit_irq_thread() would make * fuzz about an active irq thread going into nirvana. @@ -642,6 +806,7 @@ static int irq_thread(void *data) void exit_irq_thread(void) { struct task_struct *tsk = current; + struct irq_desc *desc; if (!tsk->irqaction) return; @@ -650,6 +815,14 @@ void exit_irq_thread(void) "exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", tsk->comm ? tsk->comm : "", tsk->pid, tsk->irqaction->irq); + desc = irq_to_desc(tsk->irqaction->irq); + + /* + * Prevent a stale desc->threads_oneshot. Must be called + * before setting the IRQTF_DIED flag. + */ + irq_finalize_oneshot(desc, tsk->irqaction, true); + /* * Set the THREAD DIED flag to prevent further wakeups of the * soon to be gone threaded handler. @@ -657,6 +830,22 @@ void exit_irq_thread(void) set_bit(IRQTF_DIED, &tsk->irqaction->flags); } +static void irq_setup_forced_threading(struct irqaction *new) +{ + if (!force_irqthreads) + return; + if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) + return; + + new->flags |= IRQF_ONESHOT; + + if (!new->thread_fn) { + set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); + new->thread_fn = new->handler; + new->handler = irq_default_primary_handler; + } +} + /* * Internal function to register an irqaction - typically used to * allocate special interrupts that are part of the architecture. @@ -666,9 +855,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) { struct irqaction *old, **old_ptr; const char *old_name = NULL; - unsigned long flags; - int nested, shared = 0; - int ret; + unsigned long flags, thread_mask = 0; + int ret, nested, shared = 0; + cpumask_var_t mask; if (!desc) return -EINVAL; @@ -692,15 +881,11 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) rand_initialize_irq(irq); } - /* Oneshot interrupts are not allowed with shared */ - if ((new->flags & IRQF_ONESHOT) && (new->flags & IRQF_SHARED)) - return -EINVAL; - /* * Check whether the interrupt nests into another interrupt * thread. */ - nested = desc->status & IRQ_NESTED_THREAD; + nested = irq_settings_is_nested_thread(desc); if (nested) { if (!new->thread_fn) return -EINVAL; @@ -710,6 +895,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * dummy function which warns when called. */ new->handler = irq_nested_primary_handler; + } else { + irq_setup_forced_threading(new); } /* @@ -733,6 +920,11 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) new->thread = t; } + if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { + ret = -ENOMEM; + goto out_thread; + } + /* * The following block of code has to be executed atomically */ @@ -744,29 +936,40 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * Can't share interrupts unless both agree to and are * the same type (level, edge, polarity). So both flag * fields must have IRQF_SHARED set and the bits which - * set the trigger type must match. + * set the trigger type must match. Also all must + * agree on ONESHOT. */ if (!((old->flags & new->flags) & IRQF_SHARED) || - ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK)) { + ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || + ((old->flags ^ new->flags) & IRQF_ONESHOT)) { old_name = old->name; goto mismatch; } -#if defined(CONFIG_IRQ_PER_CPU) /* All handlers must agree on per-cpuness */ if ((old->flags & IRQF_PERCPU) != (new->flags & IRQF_PERCPU)) goto mismatch; -#endif /* add new interrupt at end of irq queue */ do { + thread_mask |= old->thread_mask; old_ptr = &old->next; old = *old_ptr; } while (old); shared = 1; } + /* + * Setup the thread mask for this irqaction. Unlikely to have + * 32 resp 64 irqs sharing one line, but who knows. + */ + if (new->flags & IRQF_ONESHOT && thread_mask == ~0UL) { + ret = -EBUSY; + goto out_mask; + } + new->thread_mask = 1 << ffz(thread_mask); + if (!shared) { irq_chip_set_defaults(desc->irq_data.chip); @@ -778,42 +981,44 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) new->flags & IRQF_TRIGGER_MASK); if (ret) - goto out_thread; - } else - compat_irq_chip_set_default_handler(desc); -#if defined(CONFIG_IRQ_PER_CPU) - if (new->flags & IRQF_PERCPU) - desc->status |= IRQ_PER_CPU; -#endif + goto out_mask; + } - desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_ONESHOT | - IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED); + desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ + IRQS_INPROGRESS | IRQS_ONESHOT | \ + IRQS_WAITING); + + if (new->flags & IRQF_PERCPU) { + irqd_set(&desc->irq_data, IRQD_PER_CPU); + irq_settings_set_per_cpu(desc); + } if (new->flags & IRQF_ONESHOT) - desc->status |= IRQ_ONESHOT; + desc->istate |= IRQS_ONESHOT; - if (!(desc->status & IRQ_NOAUTOEN)) { - desc->depth = 0; - desc->status &= ~IRQ_DISABLED; - desc->irq_data.chip->irq_startup(&desc->irq_data); - } else + if (irq_settings_can_autoenable(desc)) + irq_startup(desc); + else /* Undo nested disables: */ desc->depth = 1; /* Exclude IRQ from balancing if requested */ - if (new->flags & IRQF_NOBALANCING) - desc->status |= IRQ_NO_BALANCING; + if (new->flags & IRQF_NOBALANCING) { + irq_settings_set_no_balancing(desc); + irqd_set(&desc->irq_data, IRQD_NO_BALANCING); + } /* Set default affinity mask once everything is setup */ - setup_affinity(irq, desc); - - } else if ((new->flags & IRQF_TRIGGER_MASK) - && (new->flags & IRQF_TRIGGER_MASK) - != (desc->status & IRQ_TYPE_SENSE_MASK)) { - /* hope the handler works with the actual trigger mode... */ - pr_warning("IRQ %d uses trigger mode %d; requested %d\n", - irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK), - (int)(new->flags & IRQF_TRIGGER_MASK)); + setup_affinity(irq, desc, mask); + + } else if (new->flags & IRQF_TRIGGER_MASK) { + unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; + unsigned int omsk = irq_settings_get_trigger_mask(desc); + + if (nmsk != omsk) + /* hope the handler works with current trigger mode */ + pr_warning("IRQ %d uses trigger mode %u; requested %u\n", + irq, nmsk, omsk); } new->irq = irq; @@ -827,8 +1032,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * Check whether we disabled the irq via the spurious handler * before. Reenable it and give it another chance. */ - if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) { - desc->status &= ~IRQ_SPURIOUS_DISABLED; + if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { + desc->istate &= ~IRQS_SPURIOUS_DISABLED; __enable_irq(desc, irq, false); } @@ -858,6 +1063,9 @@ mismatch: #endif ret = -EBUSY; +out_mask: + free_cpumask_var(mask); + out_thread: raw_spin_unlock_irqrestore(&desc->lock, flags); if (new->thread) { @@ -880,9 +1088,14 @@ out_thread: */ int setup_irq(unsigned int irq, struct irqaction *act) { + int retval; struct irq_desc *desc = irq_to_desc(irq); - return __setup_irq(irq, desc, act); + chip_bus_lock(desc); + retval = __setup_irq(irq, desc, act); + chip_bus_sync_unlock(desc); + + return retval; } EXPORT_SYMBOL_GPL(setup_irq); @@ -933,13 +1146,8 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) #endif /* If this was the last handler, shut down the IRQ line: */ - if (!desc->action) { - desc->status |= IRQ_DISABLED; - if (desc->irq_data.chip->irq_shutdown) - desc->irq_data.chip->irq_shutdown(&desc->irq_data); - else - desc->irq_data.chip->irq_disable(&desc->irq_data); - } + if (!desc->action) + irq_shutdown(desc); #ifdef CONFIG_SMP /* make sure affinity_hint is cleaned up */ @@ -1013,6 +1221,11 @@ void free_irq(unsigned int irq, void *dev_id) if (!desc) return; +#ifdef CONFIG_SMP + if (WARN_ON(desc->affinity_notify)) + desc->affinity_notify = NULL; +#endif + chip_bus_lock(desc); kfree(__free_irq(irq, dev_id)); chip_bus_sync_unlock(desc); @@ -1083,7 +1296,7 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler, if (!desc) return -EINVAL; - if (desc->status & IRQ_NOREQUEST) + if (!irq_settings_can_request(desc)) return -EINVAL; if (!handler) { @@ -1158,7 +1371,7 @@ int request_any_context_irq(unsigned int irq, irq_handler_t handler, if (!desc) return -EINVAL; - if (desc->status & IRQ_NESTED_THREAD) { + if (irq_settings_is_nested_thread(desc)) { ret = request_threaded_irq(irq, NULL, handler, flags, name, dev_id); return !ret ? IRQC_IS_NESTED : ret; |