Commit 0edc23ea authored by Marc Zyngier's avatar Marc Zyngier
Browse files

irqchip/gic-v3: Add VLPI/DirectLPI discovery 



Add helper functions that probe for VLPI and DirectLPI properties.

Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 0d94ded2

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;