linux-kernel - [PATCH v2 03/52] irqchip/gic-v3: Add VLPI/DirectLPI discovery

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Message-Id: <20170628150411.15846-4-marc.zyngier@arm.com>
Date:   Wed, 28 Jun 2017 16:03:22 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     Christoffer Dall <christoffer.dall@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 03/52] irqchip/gic-v3: Add VLPI/DirectLPI discovery

Add helper functions that probe for VLPI and DirectLPI properties.

Reviewed-by: Eric Auger <eric.auger@...hat.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@....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 bc58a4339a97..efbd998baa9c 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -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)
 {
 	/*
@@ -965,6 +983,8 @@ 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;
@@ -973,6 +993,8 @@ 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