linux-kernel - [tip: x86/irq] iommu/vt-d: Consolidate irq domain getter

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Date:   Wed, 16 Sep 2020 15:12:23 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <jroedel@...e.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/irq] iommu/vt-d: Consolidate irq domain getter

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     60e5a9397c0c4b7cecf05fec1aef8fe2ae5c9f3c
Gitweb:        https://git.kernel.org/tip/60e5a9397c0c4b7cecf05fec1aef8fe2ae5c9f3c
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Wed, 26 Aug 2020 13:16:37 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 16 Sep 2020 16:52:29 +02:00

iommu/vt-d: Consolidate irq domain getter

The irq domain request mode is now indicated in irq_alloc_info::type.

Consolidate the two getter functions into one.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Joerg Roedel <jroedel@...e.de>
Link: https://lore.kernel.org/r/20200826112331.530546013@linutronix.de

---
 drivers/iommu/intel/irq_remapping.c | 67 ++++++++++------------------
 1 file changed, 24 insertions(+), 43 deletions(-)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 9b15cd0..d85656e 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -204,35 +204,40 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
 	return rc;
 }
 
-static struct intel_iommu *map_hpet_to_ir(u8 hpet_id)
+static struct irq_domain *map_hpet_to_ir(u8 hpet_id)
 {
 	int i;
 
-	for (i = 0; i < MAX_HPET_TBS; 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;
+			return ir_hpet[i].iommu->ir_domain;
+	}
 	return NULL;
 }
 
-static struct intel_iommu *map_ioapic_to_ir(int apic)
+static struct intel_iommu *map_ioapic_to_iommu(int apic)
 {
 	int i;
 
-	for (i = 0; i < MAX_IO_APICS; i++)
+	for (i = 0; i < MAX_IO_APICS; i++) {
 		if (ir_ioapic[i].id == apic && ir_ioapic[i].iommu)
 			return ir_ioapic[i].iommu;
+	}
 	return NULL;
 }
 
-static struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
+static struct irq_domain *map_ioapic_to_ir(int apic)
 {
-	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu = map_ioapic_to_iommu(apic);
 
-	drhd = dmar_find_matched_drhd_unit(dev);
-	if (!drhd)
-		return NULL;
+	return iommu ? iommu->ir_domain : NULL;
+}
 
-	return drhd->iommu;
+static struct irq_domain *map_dev_to_ir(struct pci_dev *dev)
+{
+	struct dmar_drhd_unit *drhd = dmar_find_matched_drhd_unit(dev);
+
+	return drhd ? drhd->iommu->ir_msi_domain : NULL;
 }
 
 static int clear_entries(struct irq_2_iommu *irq_iommu)
@@ -1002,7 +1007,7 @@ static int __init parse_ioapics_under_ir(void)
 
 	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
 		int ioapic_id = mpc_ioapic_id(ioapic_idx);
-		if (!map_ioapic_to_ir(ioapic_id)) {
+		if (!map_ioapic_to_iommu(ioapic_id)) {
 			pr_err(FW_BUG "ioapic %d has no mapping iommu, "
 			       "interrupt remapping will be disabled\n",
 			       ioapic_id);
@@ -1107,47 +1112,23 @@ static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
 	irte->redir_hint = 1;
 }
 
-static struct irq_domain *intel_get_ir_irq_domain(struct irq_alloc_info *info)
+static struct irq_domain *intel_get_irq_domain(struct irq_alloc_info *info)
 {
-	struct intel_iommu *iommu = NULL;
-
 	if (!info)
 		return NULL;
 
 	switch (info->type) {
 	case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT:
-		iommu = map_ioapic_to_ir(info->ioapic_id);
-		break;
+		return map_ioapic_to_ir(info->ioapic_id);
 	case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT:
-		iommu = map_hpet_to_ir(info->hpet_id);
-		break;
-	default:
-		BUG_ON(1);
-		break;
-	}
-
-	return iommu ? iommu->ir_domain : NULL;
-}
-
-static struct irq_domain *intel_get_irq_domain(struct irq_alloc_info *info)
-{
-	struct intel_iommu *iommu;
-
-	if (!info)
-		return NULL;
-
-	switch (info->type) {
+		return map_hpet_to_ir(info->hpet_id);
 	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
 	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
-		iommu = map_dev_to_ir(info->msi_dev);
-		if (iommu)
-			return iommu->ir_msi_domain;
-		break;
+		return map_dev_to_ir(info->msi_dev);
 	default:
-		break;
+		WARN_ON_ONCE(1);
+		return NULL;
 	}
-
-	return NULL;
 }
 
 struct irq_remap_ops intel_irq_remap_ops = {
@@ -1156,7 +1137,7 @@ struct irq_remap_ops intel_irq_remap_ops = {
 	.disable		= disable_irq_remapping,
 	.reenable		= reenable_irq_remapping,
 	.enable_faulting	= enable_drhd_fault_handling,
-	.get_ir_irq_domain	= intel_get_ir_irq_domain,
+	.get_ir_irq_domain	= intel_get_irq_domain,
 	.get_irq_domain		= intel_get_irq_domain,
 };