genirq: Add a new function to get IPI reverse mapping (f9bce791) · Commits · 戴 / test

include/linux/irq.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -942,5 +942,6 @@ static inline u32 irq_reg_readl(struct irq_chip_generic *gc,

		/* Contrary to Linux irqs, for hardware irqs the irq number 0 is valid */
		#define INVALID_HWIRQ (~0UL)
		irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu);

		#endif /* _LINUX_IRQ_H */

+34 −0

Original line number	Diff line number	Diff line
		@@ -135,3 +135,37 @@ void irq_destroy_ipi(unsigned int irq)

		irq_domain_free_irqs(irq, nr_irqs);
		}

		/**
		* ipi_get_hwirq - Get the hwirq associated with an IPI to a cpu
		* @irq: linux irq number
		* @cpu: the target cpu
		*
		* When dealing with coprocessors IPI, we need to inform the coprocessor of
		* the hwirq it needs to use to receive and send IPIs.
		*
		* Returns hwirq value on success and INVALID_HWIRQ on failure.
		*/
		irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu)
		{
		struct irq_data *data = irq_get_irq_data(irq);
		struct cpumask *ipimask = data ? irq_data_get_affinity_mask(data) : NULL;

		if (!data \|\| !ipimask \|\| cpu > nr_cpu_ids)
		return INVALID_HWIRQ;

		if (!cpumask_test_cpu(cpu, ipimask))
		return INVALID_HWIRQ;

		/*
		* Get the real hardware irq number if the underlying implementation
		* uses a seperate irq per cpu. If the underlying implementation uses
		* a single hardware irq for all cpus then the IPI send mechanism
		* needs to take care of this.
		*/
		if (irq_domain_is_ipi_per_cpu(data->domain))
		data = irq_get_irq_data(irq + cpu - data->common->ipi_offset);

		return data ? irqd_to_hwirq(data) : INVALID_HWIRQ;
		}
		EXPORT_SYMBOL_GPL(ipi_get_hwirq);