[RFC PATCH 02/33] irqchip/gic-v3: Add VLPI/DirectLPI discovery

[Marc Zyngier]

Add helper functions that probe for VLPI and DirectLPI properties.

Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 drivers/irqchip/irq-gic-v3.c       | 22 ++++++++++++++++++++++
 include/linux/irqchip/arm-gic-v3.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 5cadec0..8a6de91 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -514,6 +514,24 @@ 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_scan_rdist_properties(__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)
 {
        /*
@@ -975,6 +993,8 @@ 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;
@@ -983,6 +1003,8 @@ 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 e808f8a..b162bfa 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -200,6 +200,7 @@
 
 #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
@@ -427,6 +428,8 @@ struct rdists {
        struct page             *prop_page;
        int                     id_bits;
        u64                     flags;
+       bool                    has_vlpis;
+       bool                    has_direct_lpi;
 };
 
 struct irq_domain;
-- 
2.1.4

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