linux-kernel - [tip: irq/core] iommu/vt-d: Enable PCI/IMS

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Date:   Mon, 05 Dec 2022 18:25:10 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Kevin Tian <kevin.tian@...el.com>,
        Marc Zyngier <maz@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: irq/core] iommu/vt-d: Enable PCI/IMS

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

Commit-ID:     4f8d12389509c80f275a12926901d6619f2046c7
Gitweb:        https://git.kernel.org/tip/4f8d12389509c80f275a12926901d6619f2046c7
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Fri, 25 Nov 2022 00:26:34 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 05 Dec 2022 19:21:04 +01:00

iommu/vt-d: Enable PCI/IMS

PCI/IMS works like PCI/MSI-X in the remapping. Just add the feature flag,
but only when on real hardware.

Virtualized IOMMUs need additional support, e.g. for PASID.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Acked-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20221124232327.081482253@linutronix.de

---
 drivers/iommu/intel/irq_remapping.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 6fab407..a723f53 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -82,7 +82,7 @@ static const struct irq_domain_ops intel_ir_domain_ops;
 
 static void iommu_disable_irq_remapping(struct intel_iommu *iommu);
 static int __init parse_ioapics_under_ir(void);
-static const struct msi_parent_ops dmar_msi_parent_ops;
+static const struct msi_parent_ops dmar_msi_parent_ops, virt_dmar_msi_parent_ops;
 
 static bool ir_pre_enabled(struct intel_iommu *iommu)
 {
@@ -577,7 +577,11 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
 
 	irq_domain_update_bus_token(iommu->ir_domain,  DOMAIN_BUS_DMAR);
 	iommu->ir_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
-	iommu->ir_domain->msi_parent_ops = &dmar_msi_parent_ops;
+
+	if (cap_caching_mode(iommu->cap))
+		iommu->ir_domain->msi_parent_ops = &virt_dmar_msi_parent_ops;
+	else
+		iommu->ir_domain->msi_parent_ops = &dmar_msi_parent_ops;
 
 	ir_table->base = page_address(pages);
 	ir_table->bitmap = bitmap;
@@ -1429,11 +1433,20 @@ static const struct irq_domain_ops intel_ir_domain_ops = {
 };
 
 static const struct msi_parent_ops dmar_msi_parent_ops = {
-	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED | MSI_FLAG_MULTI_PCI_MSI,
+	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED |
+				  MSI_FLAG_MULTI_PCI_MSI |
+				  MSI_FLAG_PCI_IMS,
 	.prefix			= "IR-",
 	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
 };
 
+static const struct msi_parent_ops virt_dmar_msi_parent_ops = {
+	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED |
+				  MSI_FLAG_MULTI_PCI_MSI,
+	.prefix			= "vIR-",
+	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
+};
+
 /*
  * Support of Interrupt Remapping Unit Hotplug
  */