linux-kernel - [PATCH 4/9] iommu/vt-d: Implement select() method on remapping irqdomain

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Message-Id: <20201013081139.1558200-5-dwmw2@infradead.org>
Date:   Tue, 13 Oct 2020 09:11:34 +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
Subject: [PATCH 4/9] iommu/vt-d: Implement select() method on remapping irqdomain

From: David Woodhouse <dwmw@...zon.co.uk>

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 drivers/iommu/intel/irq_remapping.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 511dfb4884bc..40c2fec122b8 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1435,7 +1435,20 @@ static void intel_irq_remapping_deactivate(struct irq_domain *domain,
 	modify_irte(&data->irq_2_iommu, &entry);
 }
 
+static int intel_irq_remapping_select(struct irq_domain *d,
+				      struct irq_fwspec *fwspec,
+				      enum irq_domain_bus_token bus_token)
+{
+	if (x86_fwspec_is_ioapic(fwspec))
+		return d == map_ioapic_to_ir(fwspec->param[0]);
+	else if (x86_fwspec_is_hpet(fwspec))
+		return d == map_hpet_to_ir(fwspec->param[0]);
+
+	return 0;
+}
+
 static const struct irq_domain_ops intel_ir_domain_ops = {
+	.select = intel_irq_remapping_select,
 	.alloc = intel_irq_remapping_alloc,
 	.free = intel_irq_remapping_free,
 	.activate = intel_irq_remapping_activate,
-- 
2.26.2