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e9849777d0
If an irq chip does not implement the irq_disable callback, then we use a lazy approach for disabling the interrupt. That means that the interrupt is marked disabled, but the interrupt line is not immediately masked in the interrupt chip. It only becomes masked if the interrupt is raised while it's marked disabled. We use this to avoid possibly expensive mask/unmask operations for common case operations. Unfortunately there are devices which do not allow the interrupt to be disabled easily at the device level. They are forced to use disable_irq_nosync(). This can result in taking each interrupt twice. Instead of enforcing the non lazy mode on all interrupts of a irq chip, provide a settings flag, which can be set by the driver for that particular interrupt line. Reported-and-tested-by: Duc Dang <dhdang@apm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1510092348370.6097@nanos
168 lines
4.4 KiB
C
168 lines
4.4 KiB
C
/*
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* Internal header to deal with irq_desc->status which will be renamed
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* to irq_desc->settings.
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*/
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enum {
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_IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS,
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_IRQ_PER_CPU = IRQ_PER_CPU,
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_IRQ_LEVEL = IRQ_LEVEL,
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_IRQ_NOPROBE = IRQ_NOPROBE,
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_IRQ_NOREQUEST = IRQ_NOREQUEST,
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_IRQ_NOTHREAD = IRQ_NOTHREAD,
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_IRQ_NOAUTOEN = IRQ_NOAUTOEN,
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_IRQ_MOVE_PCNTXT = IRQ_MOVE_PCNTXT,
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_IRQ_NO_BALANCING = IRQ_NO_BALANCING,
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_IRQ_NESTED_THREAD = IRQ_NESTED_THREAD,
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_IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID,
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_IRQ_IS_POLLED = IRQ_IS_POLLED,
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_IRQ_DISABLE_UNLAZY = IRQ_DISABLE_UNLAZY,
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_IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
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};
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#define IRQ_PER_CPU GOT_YOU_MORON
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#define IRQ_NO_BALANCING GOT_YOU_MORON
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#define IRQ_LEVEL GOT_YOU_MORON
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#define IRQ_NOPROBE GOT_YOU_MORON
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#define IRQ_NOREQUEST GOT_YOU_MORON
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#define IRQ_NOTHREAD GOT_YOU_MORON
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#define IRQ_NOAUTOEN GOT_YOU_MORON
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#define IRQ_NESTED_THREAD GOT_YOU_MORON
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#define IRQ_PER_CPU_DEVID GOT_YOU_MORON
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#define IRQ_IS_POLLED GOT_YOU_MORON
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#define IRQ_DISABLE_UNLAZY GOT_YOU_MORON
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#undef IRQF_MODIFY_MASK
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#define IRQF_MODIFY_MASK GOT_YOU_MORON
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static inline void
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irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set)
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{
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desc->status_use_accessors &= ~(clr & _IRQF_MODIFY_MASK);
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desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK);
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}
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static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_PER_CPU;
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}
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static inline bool irq_settings_is_per_cpu_devid(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_PER_CPU_DEVID;
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}
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static inline void irq_settings_set_per_cpu(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_PER_CPU;
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}
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static inline void irq_settings_set_no_balancing(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_NO_BALANCING;
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}
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static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_NO_BALANCING;
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}
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static inline u32 irq_settings_get_trigger_mask(struct irq_desc *desc)
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{
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return desc->status_use_accessors & IRQ_TYPE_SENSE_MASK;
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}
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static inline void
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irq_settings_set_trigger_mask(struct irq_desc *desc, u32 mask)
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{
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desc->status_use_accessors &= ~IRQ_TYPE_SENSE_MASK;
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desc->status_use_accessors |= mask & IRQ_TYPE_SENSE_MASK;
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}
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static inline bool irq_settings_is_level(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_LEVEL;
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}
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static inline void irq_settings_clr_level(struct irq_desc *desc)
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{
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desc->status_use_accessors &= ~_IRQ_LEVEL;
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}
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static inline void irq_settings_set_level(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_LEVEL;
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}
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static inline bool irq_settings_can_request(struct irq_desc *desc)
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{
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return !(desc->status_use_accessors & _IRQ_NOREQUEST);
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}
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static inline void irq_settings_clr_norequest(struct irq_desc *desc)
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{
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desc->status_use_accessors &= ~_IRQ_NOREQUEST;
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}
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static inline void irq_settings_set_norequest(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_NOREQUEST;
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}
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static inline bool irq_settings_can_thread(struct irq_desc *desc)
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{
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return !(desc->status_use_accessors & _IRQ_NOTHREAD);
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}
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static inline void irq_settings_clr_nothread(struct irq_desc *desc)
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{
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desc->status_use_accessors &= ~_IRQ_NOTHREAD;
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}
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static inline void irq_settings_set_nothread(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_NOTHREAD;
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}
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static inline bool irq_settings_can_probe(struct irq_desc *desc)
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{
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return !(desc->status_use_accessors & _IRQ_NOPROBE);
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}
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static inline void irq_settings_clr_noprobe(struct irq_desc *desc)
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{
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desc->status_use_accessors &= ~_IRQ_NOPROBE;
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}
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static inline void irq_settings_set_noprobe(struct irq_desc *desc)
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{
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desc->status_use_accessors |= _IRQ_NOPROBE;
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}
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static inline bool irq_settings_can_move_pcntxt(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_MOVE_PCNTXT;
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}
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static inline bool irq_settings_can_autoenable(struct irq_desc *desc)
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{
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return !(desc->status_use_accessors & _IRQ_NOAUTOEN);
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}
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static inline bool irq_settings_is_nested_thread(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_NESTED_THREAD;
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}
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static inline bool irq_settings_is_polled(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_IS_POLLED;
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}
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static inline bool irq_settings_disable_unlazy(struct irq_desc *desc)
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{
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return desc->status_use_accessors & _IRQ_DISABLE_UNLAZY;
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}
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static inline void irq_settings_clr_disable_unlazy(struct irq_desc *desc)
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{
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desc->status_use_accessors &= ~_IRQ_DISABLE_UNLAZY;
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}
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