genirq: Provide NMI handlers (2dcf1fbc) · Commits · 戴 / test

include/linux/irq.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -601,6 +601,9 @@ extern void handle_percpu_devid_irq(struct irq_desc *desc);
		extern void handle_bad_irq(struct irq_desc *desc);
		extern void handle_nested_irq(unsigned int irq);

		extern void handle_fasteoi_nmi(struct irq_desc *desc);
		extern void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc);

		extern int irq_chip_compose_msi_msg(struct irq_data data, struct msi_msg msg);
		extern int irq_chip_pm_get(struct irq_data *data);
		extern int irq_chip_pm_put(struct irq_data *data);

kernel/irq/chip.c

+54 −0

Original line number	Diff line number	Diff line
		@@ -729,6 +729,37 @@ out:
		}
		EXPORT_SYMBOL_GPL(handle_fasteoi_irq);

		/**
		* handle_fasteoi_nmi - irq handler for NMI interrupt lines
		* @desc: the interrupt description structure for this irq
		*
		* A simple NMI-safe handler, considering the restrictions
		* from request_nmi.
		*
		* 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 handle_fasteoi_nmi(struct irq_desc *desc)
		{
		struct irq_chip *chip = irq_desc_get_chip(desc);
		struct irqaction *action = desc->action;
		unsigned int irq = irq_desc_get_irq(desc);
		irqreturn_t res;

		trace_irq_handler_entry(irq, action);
		/*
		* NMIs cannot be shared, there is only one action.
		*/
		res = action->handler(irq, action->dev_id);
		trace_irq_handler_exit(irq, action, res);

		if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
		}
		EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);

		/**
		* handle_edge_irq - edge type IRQ handler
		* @desc: the interrupt description structure for this irq
		@@ -908,6 +939,29 @@ void handle_percpu_devid_irq(struct irq_desc *desc)
		chip->irq_eoi(&desc->irq_data);
		}

		/**
		* handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
		* dev ids
		* @desc: the interrupt description structure for this irq
		*
		* Similar to handle_fasteoi_nmi, but handling the dev_id cookie
		* as a percpu pointer.
		*/
		void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
		{
		struct irq_chip *chip = irq_desc_get_chip(desc);
		struct irqaction *action = desc->action;
		unsigned int irq = irq_desc_get_irq(desc);
		irqreturn_t res;

		trace_irq_handler_entry(irq, action);
		res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
		trace_irq_handler_exit(irq, action, res);

		if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
		}

		static void
		__irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
		int is_chained, const char *name)

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