linux-kernel - [PATCH 1/2] iommu/vt-d: Select PCI_PRI for INTEL_IOMMU

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Message-Id: <20191009224551.179497-2-helgaas@kernel.org>
Date:   Wed,  9 Oct 2019 17:45:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>
Cc:     Ashok Raj <ashok.raj@...el.com>,
        Keith Busch <keith.busch@...el.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 1/2] iommu/vt-d: Select PCI_PRI for INTEL_IOMMU_SVM

From: Bjorn Helgaas <bhelgaas@...gle.com>

When CONFIG_INTEL_IOMMU_SVM=y, iommu_enable_dev_iotlb() calls PRI
interfaces (pci_reset_pri() and pci_enable_pri()), but those are only
implemented when CONFIG_PCI_PRI is enabled.

Previously INTEL_IOMMU_SVM selected PCI_PASID but not PCI_PRI, so the state
of PCI_PRI depended on whether AMD_IOMMU (which selects PCI_PRI) was
enabled or PCI_PRI was enabled explicitly.

The behavior of iommu_enable_dev_iotlb() should not depend on whether
AMD_IOMMU is enabled.  Make it predictable by having INTEL_IOMMU_SVM select
PCI_PRI so iommu_enable_dev_iotlb() always uses the full implementations of
PRI interfaces.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/iommu/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e3842eabcfdd..b183c9f916b0 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -207,6 +207,7 @@ config INTEL_IOMMU_SVM
 	bool "Support for Shared Virtual Memory with Intel IOMMU"
 	depends on INTEL_IOMMU && X86
 	select PCI_PASID
+	select PCI_PRI
 	select MMU_NOTIFIER
 	help
 	  Shared Virtual Memory (SVM) provides a facility for devices
-- 
2.23.0.581.g78d2f28ef7-goog