linux-kernel - [PATCH 3/9] iommu/amd: Implement select() method on remapping irqdomain

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Date:   Tue, 13 Oct 2020 09:11:33 +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 3/9] iommu/amd: Implement select() method on remapping irqdomain

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

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 drivers/iommu/amd/iommu.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 13d0a8f42d56..7ecebc5d255f 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3590,6 +3590,24 @@ struct irq_remap_ops amd_iommu_irq_ops = {
 	.get_irq_domain		= get_irq_domain,
 };
 
+static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec,
+				enum irq_domain_bus_token bus_token)
+{
+	struct amd_iommu *iommu;
+	int devid = -1;
+
+	if (x86_fwspec_is_ioapic(fwspec))
+		devid = get_ioapic_devid(fwspec->param[0]);
+	else if (x86_fwspec_is_ioapic(fwspec))
+		devid = get_hpet_devid(fwspec->param[0]);
+
+	if (devid < 0)
+		return 0;
+
+	iommu = amd_iommu_rlookup_table[devid];
+	return iommu && iommu->ir_domain == d;
+}
+
 static void irq_remapping_prepare_irte(struct amd_ir_data *data,
 				       struct irq_cfg *irq_cfg,
 				       struct irq_alloc_info *info,
@@ -3813,6 +3831,7 @@ static void irq_remapping_deactivate(struct irq_domain *domain,
 }
 
 static const struct irq_domain_ops amd_ir_domain_ops = {
+	.select = irq_remapping_select,
 	.alloc = irq_remapping_alloc,
 	.free = irq_remapping_free,
 	.activate = irq_remapping_activate,
-- 
2.26.2