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From: Bjorn Helgaas <helgaas@kernel.org>
To: Kuppuswamy Sathyanarayanan
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Joerg Roedel <joro@8bytes.org>
Cc: Ashok Raj <ashok.raj@intel.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Keith Busch <keith.busch@intel.com>,
	iommu@lists.linux-foundation.org,
	Bjorn Helgaas <bhelgaas@google.com>
Subject: [PATCH 1/2] iommu/vt-d: Select PCI_PRI for INTEL_IOMMU_SVM
Date: Wed,  9 Oct 2019 17:45:50 -0500
Message-ID: <20191009224551.179497-2-helgaas@kernel.org> (raw)
In-Reply-To: <20191009224551.179497-1-helgaas@kernel.org>

From: Bjorn Helgaas <bhelgaas@google.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@google.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

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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 22:45 [PATCH 0/2] " Bjorn Helgaas
2019-10-09 22:45 ` Bjorn Helgaas [this message]
2019-10-09 23:42   ` [PATCH 1/2] " Kuppuswamy Sathyanarayanan
2019-10-09 22:45 ` [PATCH 2/2] PCI/ATS: Move pci_prg_resp_pasid_required() to CONFIG_PCI_PRI Bjorn Helgaas
2019-10-09 22:55   ` Kuppuswamy Sathyanarayanan
2019-10-09 23:50 ` [PATCH 0/2] iommu/vt-d: Select PCI_PRI for INTEL_IOMMU_SVM Jerry Snitselaar
2019-10-15 11:46 ` Joerg Roedel
2019-10-15 21:40 ` Bjorn Helgaas

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