linux-kernel - [PATCH v3 04/35] x86/devicetree: Fix the ioapic interrupt type table

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Message-Id: <20201024213535.443185-5-dwmw2@infradead.org>
Date:   Sat, 24 Oct 2020 22:35:04 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     x86@...nel.org
Cc:     kvm <kvm@...r.kernel.org>, iommu@...ts.linux-foundation.org,
        joro@...tes.org, Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-hyperv@...r.kernel.org, maz@...terjones.org,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH v3 04/35] x86/devicetree: Fix the ioapic interrupt type table

From: Thomas Gleixner <tglx@...utronix.de>

The ioapic interrupt type table is wrong as it assumes that polarity in
IO/APIC context means active high when set. But the IO/APIC polarity is
working the other way round. This works because the ordering of the entries
is consistent with the device tree and the type information is not used by
the IO/APIC interrupt chip.

The whole trigger and polarity business of IO/APIC is misleading and the
corresponding constants which are defined as 0/1 are not used consistently
and are going to be removed.

Rename the type table members to 'is_level' and 'active_low' and adjust the
type information for consistency sake.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 arch/x86/kernel/devicetree.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index ddffd80f5c52..6a4cb71c2498 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -184,31 +184,31 @@ static unsigned int ioapic_id;
 
 struct of_ioapic_type {
 	u32 out_type;
-	u32 trigger;
-	u32 polarity;
+	u32 is_level;
+	u32 active_low;
 };
 
 static struct of_ioapic_type of_ioapic_type[] =
 {
 	{
-		.out_type	= IRQ_TYPE_EDGE_RISING,
-		.trigger	= IOAPIC_EDGE,
-		.polarity	= 1,
+		.out_type	= IRQ_TYPE_EDGE_FALLING,
+		.is_level	= 0,
+		.active_low	= 1,
 	},
 	{
-		.out_type	= IRQ_TYPE_LEVEL_LOW,
-		.trigger	= IOAPIC_LEVEL,
-		.polarity	= 0,
+		.out_type	= IRQ_TYPE_LEVEL_HIGH,
+		.is_level	= 1,
+		.active_low	= 0,
 	},
 	{
-		.out_type	= IRQ_TYPE_LEVEL_HIGH,
-		.trigger	= IOAPIC_LEVEL,
-		.polarity	= 1,
+		.out_type	= IRQ_TYPE_LEVEL_LOW,
+		.is_level	= 1,
+		.active_low	= 1,
 	},
 	{
-		.out_type	= IRQ_TYPE_EDGE_FALLING,
-		.trigger	= IOAPIC_EDGE,
-		.polarity	= 0,
+		.out_type	= IRQ_TYPE_EDGE_RISING,
+		.is_level	= 0,
+		.active_low	= 0,
 	},
 };
 
@@ -228,7 +228,7 @@ static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 		return -EINVAL;
 
 	it = &of_ioapic_type[type_index];
-	ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
+	ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low);
 	tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 	tmp.ioapic.pin = fwspec->param[0];
 
-- 
2.26.2