linux-kernel - [patch V3 31/33] iommu/vt-d: Enable PCI/IMS

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Date:   Fri, 25 Nov 2022 00:26:34 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: [patch V3 31/33] 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>
---
V3: Only enable on real hardware (Kevin)
---
 drivers/iommu/intel/irq_remapping.c |   19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

--- 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
 
 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(str
 
 	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
 };
 
 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
  */