forked from luck/tmp_suning_uos_patched
edd14cfebc
This adds a software irq handler for controllers that multiplex interrupts from multiple devices, but don't know which device generated the interrupt. For these devices, the irq handler that demuxes must check every action for every software irq using the same h/w irq in order to find out which device generated the interrupt. This will inevitably trigger spurious interrupt detection if we are noting the irq. The new irq handler does not track the handling for spurious interrupt detection. An irq that uses this also won't get stats tracked since it didn't generate the interrupt, nor added to randomness since they are not random. Signed-off-by: Keith Busch <keith.busch@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-pci@vger.kernel.org Cc: Jon Derrick <jonathan.derrick@intel.com> Link: http://lkml.kernel.org/r/1466200821-29159-1-git-send-email-keith.busch@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
227 lines
6.9 KiB
C
227 lines
6.9 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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#include <linux/kernel_stat.h>
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#include <linux/pm_runtime.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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extern struct irqaction chained_action;
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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->core_internal_state__do_not_mess_with_it
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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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extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
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extern void __disable_irq(struct irq_desc *desc);
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extern void __enable_irq(struct irq_desc *desc);
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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 unmask_threaded_irq(struct irq_desc *desc);
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#ifdef CONFIG_SPARSE_IRQ
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static inline void irq_mark_irq(unsigned int irq) { }
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#else
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extern void irq_mark_irq(unsigned int irq);
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#endif
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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, unsigned int *flags);
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irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
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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);
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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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#define for_each_action_of_desc(desc, act) \
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for (act = desc->act; act; act = act->next)
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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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#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
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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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__irqd_to_state(d) |= 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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__irqd_to_state(d) &= ~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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__irqd_to_state(d) &= ~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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__irqd_to_state(d) |= 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 __irqd_to_state(d) & mask;
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}
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#undef __irqd_to_state
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static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
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{
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__this_cpu_inc(*desc->kstat_irqs);
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__this_cpu_inc(kstat.irqs_sum);
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}
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static inline int irq_desc_get_node(struct irq_desc *desc)
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{
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return irq_common_data_get_node(&desc->irq_common_data);
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}
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static inline int irq_desc_is_chained(struct irq_desc *desc)
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{
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return (desc->action && desc->action == &chained_action);
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}
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#ifdef CONFIG_PM_SLEEP
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bool irq_pm_check_wakeup(struct irq_desc *desc);
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void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
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void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
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#else
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static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
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static inline void
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irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
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static inline void
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irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
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#endif
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