irqchip/gic-v3: Add VLPI/DirectLPI discovery (0edc23ea) · Commits · 戴 / test

drivers/irqchip/irq-gic-v3.c

+23 −1

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved.
		* Copyright (C) 2013-2017 ARM Limited, All Rights Reserved.
		* Author: Marc Zyngier <marc.zyngier@arm.com>
		*
		* This program is free software; you can redistribute it and/or modify
		@@ -504,6 +504,24 @@ static int gic_populate_rdist(void)
		return -ENODEV;
		}

		static int __gic_update_vlpi_properties(struct redist_region *region,
		void __iomem *ptr)
		{
		u64 typer = gic_read_typer(ptr + GICR_TYPER);
		gic_data.rdists.has_vlpis &= !!(typer & GICR_TYPER_VLPIS);
		gic_data.rdists.has_direct_lpi &= !!(typer & GICR_TYPER_DirectLPIS);

		return 1;
		}

		static void gic_update_vlpi_properties(void)
		{
		gic_iterate_rdists(__gic_update_vlpi_properties);
		pr_info("%sVLPI support, %sdirect LPI support\n",
		!gic_data.rdists.has_vlpis ? "no " : "",
		!gic_data.rdists.has_direct_lpi ? "no " : "");
		}

		static void gic_cpu_sys_reg_init(void)
		{
		/*
		@@ -968,6 +986,8 @@ static int __init gic_init_bases(void __iomem *dist_base,
		gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
		&gic_data);
		gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
		gic_data.rdists.has_vlpis = true;
		gic_data.rdists.has_direct_lpi = true;

		if (WARN_ON(!gic_data.domain) \|\| WARN_ON(!gic_data.rdists.rdist)) {
		err = -ENOMEM;
		@@ -976,6 +996,8 @@ static int __init gic_init_bases(void __iomem *dist_base,

		set_handle_irq(gic_handle_irq);

		gic_update_vlpi_properties();

		if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
		its_init(handle, &gic_data.rdists, gic_data.domain);

include/linux/irqchip/arm-gic-v3.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -204,6 +204,7 @@

		#define GICR_TYPER_PLPIS (1U << 0)
		#define GICR_TYPER_VLPIS (1U << 1)
		#define GICR_TYPER_DirectLPIS (1U << 3)
		#define GICR_TYPER_LAST (1U << 4)

		#define GIC_V3_REDIST_SIZE 0x20000
		@@ -487,6 +488,8 @@ struct rdists {
		struct page *prop_page;
		int id_bits;
		u64 flags;
		bool has_vlpis;
		bool has_direct_lpi;
		};

		struct irq_domain;

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