linux-kernel - [PATCH v3 30/35] iommu/vt-d: Simplify intel_irq_remapping

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Date:   Sat, 24 Oct 2020 22:35:30 +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 30/35] iommu/vt-d: Simplify intel_irq_remapping_select()

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

Now that the old get_irq_domain() method has gone, consolidate on just the
map_XXX_to_iommu() functions.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/iommu/intel/irq_remapping.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index bca44015bc1d..aeffda92b10b 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -203,13 +203,13 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
 	return rc;
 }
 
-static struct irq_domain *map_hpet_to_ir(u8 hpet_id)
+static struct intel_iommu *map_hpet_to_iommu(u8 hpet_id)
 {
 	int i;
 
 	for (i = 0; i < MAX_HPET_TBS; i++) {
 		if (ir_hpet[i].id == hpet_id && ir_hpet[i].iommu)
-			return ir_hpet[i].iommu->ir_domain;
+			return ir_hpet[i].iommu;
 	}
 	return NULL;
 }
@@ -225,13 +225,6 @@ static struct intel_iommu *map_ioapic_to_iommu(int apic)
 	return NULL;
 }
 
-static struct irq_domain *map_ioapic_to_ir(int apic)
-{
-	struct intel_iommu *iommu = map_ioapic_to_iommu(apic);
-
-	return iommu ? iommu->ir_domain : NULL;
-}
-
 static struct irq_domain *map_dev_to_ir(struct pci_dev *dev)
 {
 	struct dmar_drhd_unit *drhd = dmar_find_matched_drhd_unit(dev);
@@ -1418,12 +1411,14 @@ static int intel_irq_remapping_select(struct irq_domain *d,
 				      struct irq_fwspec *fwspec,
 				      enum irq_domain_bus_token bus_token)
 {
+	struct intel_iommu *iommu = NULL;
+
 	if (x86_fwspec_is_ioapic(fwspec))
-		return d == map_ioapic_to_ir(fwspec->param[0]);
+		iommu = map_ioapic_to_iommu(fwspec->param[0]);
 	else if (x86_fwspec_is_hpet(fwspec))
-		return d == map_hpet_to_ir(fwspec->param[0]);
+		iommu = map_hpet_to_iommu(fwspec->param[0]);
 
-	return 0;
+	return iommu && d == iommu->ir_domain;
 }
 
 static const struct irq_domain_ops intel_ir_domain_ops = {
-- 
2.26.2