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    Subject[PATCH v3 03/59] irqchip/gic-v3: Add VLPI/DirectLPI discovery
    Date
    Add helper functions that probe for VLPI and DirectLPI properties.

    Reviewed-by: Eric Auger <eric.auger@redhat.com>
    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    drivers/irqchip/irq-gic-v3.c | 24 +++++++++++++++++++++++-
    include/linux/irqchip/arm-gic-v3.h | 3 +++
    2 files changed, 26 insertions(+), 1 deletion(-)

    diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
    index 640f621c7f75..17f0ad41864f 100644
    --- a/drivers/irqchip/irq-gic-v3.c
    +++ b/drivers/irqchip/irq-gic-v3.c
    @@ -1,5 +1,5 @@
    /*
    - * 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);

    diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
    index 6a1f87ff94e2..20a553423ac7 100644
    --- a/include/linux/irqchip/arm-gic-v3.h
    +++ b/include/linux/irqchip/arm-gic-v3.h
    @@ -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;
    --
    2.11.0
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