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a92444c6b2
In course of the sdhci/sdio discussion with Russell about killing the sdio kthread hackery we discovered the need to be able to wake an interrupt thread from software. The rationale for this is, that sdio hardware can lack proper interrupt support for certain features. So the driver needs to poll the status registers, but at the same time it needs to be woken up by an hardware interrupt. To be able to get rid of the home brewn kthread construct of sdio we need a way to wake an irq thread independent of an actual hardware interrupt. Provide an irq_wake_thread() function which wakes up the thread which is associated to a given dev_id. This allows sdio to invoke the irq thread from the hardware irq handler via the IRQ_WAKE_THREAD return value and provides a possibility to wake it via a timer for the polling scenarios. That allows to simplify the sdio logic significantly. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Chris Ball <chris@printf.net> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20140215003823.772565780@linutronix.de
183 lines
5.6 KiB
C
183 lines
5.6 KiB
C
/*
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* IRQ subsystem internal functions and variables:
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*
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* Do not ever include this file from anything else than
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* kernel/irq/. Do not even think about using any information outside
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* of this file for your non core code.
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*/
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#include <linux/irqdesc.h>
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#ifdef CONFIG_SPARSE_IRQ
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# define IRQ_BITMAP_BITS (NR_IRQS + 8196)
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#else
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# define IRQ_BITMAP_BITS NR_IRQS
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#endif
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#define istate core_internal_state__do_not_mess_with_it
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extern bool noirqdebug;
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/*
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* Bits used by threaded handlers:
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* IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
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* IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
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* IRQTF_AFFINITY - irq thread is requested to adjust affinity
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* IRQTF_FORCED_THREAD - irq action is force threaded
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*/
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enum {
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IRQTF_RUNTHREAD,
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IRQTF_WARNED,
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IRQTF_AFFINITY,
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IRQTF_FORCED_THREAD,
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};
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/*
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* Bit masks for desc->state
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*
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* IRQS_AUTODETECT - autodetection in progress
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* IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
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* detection
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* IRQS_POLL_INPROGRESS - polling in progress
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* IRQS_ONESHOT - irq is not unmasked in primary handler
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* IRQS_REPLAY - irq is replayed
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* IRQS_WAITING - irq is waiting
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* IRQS_PENDING - irq is pending and replayed later
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* IRQS_SUSPENDED - irq is suspended
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*/
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enum {
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IRQS_AUTODETECT = 0x00000001,
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IRQS_SPURIOUS_DISABLED = 0x00000002,
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IRQS_POLL_INPROGRESS = 0x00000008,
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IRQS_ONESHOT = 0x00000020,
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IRQS_REPLAY = 0x00000040,
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IRQS_WAITING = 0x00000080,
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IRQS_PENDING = 0x00000200,
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IRQS_SUSPENDED = 0x00000800,
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};
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#include "debug.h"
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#include "settings.h"
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#define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data)
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extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
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unsigned long flags);
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extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
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extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
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extern int irq_startup(struct irq_desc *desc, bool resend);
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extern void irq_shutdown(struct irq_desc *desc);
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extern void irq_enable(struct irq_desc *desc);
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extern void irq_disable(struct irq_desc *desc);
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extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
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extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
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extern void mask_irq(struct irq_desc *desc);
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extern void unmask_irq(struct irq_desc *desc);
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extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
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irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
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irqreturn_t handle_irq_event(struct irq_desc *desc);
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/* Resending of interrupts :*/
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void check_irq_resend(struct irq_desc *desc, unsigned int irq);
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bool irq_wait_for_poll(struct irq_desc *desc);
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void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
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#ifdef CONFIG_PROC_FS
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extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
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extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
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extern void register_handler_proc(unsigned int irq, struct irqaction *action);
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extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
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#else
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static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
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static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
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static inline void register_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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static inline void unregister_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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#endif
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extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
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extern void irq_set_thread_affinity(struct irq_desc *desc);
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extern int irq_do_set_affinity(struct irq_data *data,
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const struct cpumask *dest, bool force);
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/* Inline functions for support of irq chips on slow busses */
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static inline void chip_bus_lock(struct irq_desc *desc)
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{
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if (unlikely(desc->irq_data.chip->irq_bus_lock))
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desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
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}
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static inline void chip_bus_sync_unlock(struct irq_desc *desc)
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{
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if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
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desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
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}
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#define _IRQ_DESC_CHECK (1 << 0)
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#define _IRQ_DESC_PERCPU (1 << 1)
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#define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
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#define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
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struct irq_desc *
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__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
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unsigned int check);
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void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
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static inline struct irq_desc *
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irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
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{
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return __irq_get_desc_lock(irq, flags, true, check);
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}
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static inline void
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irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
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{
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__irq_put_desc_unlock(desc, flags, true);
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}
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static inline struct irq_desc *
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irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
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{
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return __irq_get_desc_lock(irq, flags, false, check);
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}
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static inline void
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irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
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{
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__irq_put_desc_unlock(desc, flags, false);
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}
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/*
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* Manipulation functions for irq_data.state
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*/
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static inline void irqd_set_move_pending(struct irq_data *d)
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{
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d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
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}
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static inline void irqd_clr_move_pending(struct irq_data *d)
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{
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d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
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}
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static inline void irqd_clear(struct irq_data *d, unsigned int mask)
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{
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d->state_use_accessors &= ~mask;
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}
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static inline void irqd_set(struct irq_data *d, unsigned int mask)
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{
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d->state_use_accessors |= mask;
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}
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static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
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{
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return d->state_use_accessors & mask;
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}
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