linux-kernel - [PATCH 06/13] iommu: Make use of DMA quirking and ACS enabled check for groups

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Date:	Fri, 11 May 2012 16:56:09 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	benh@...nel.crashing.org, aik@...abs.ru,
	david@...son.dropbear.id.au, joerg.roedel@....com,
	dwmw2@...radead.org
Cc:	chrisw@...s-sol.org, agraf@...e.de, benve@...co.com,
	aafabbri@...co.com, B08248@...escale.com, B07421@...escale.com,
	avi@...hat.com, konrad.wilk@...cle.com, kvm@...r.kernel.org,
	qemu-devel@...gnu.org, iommu@...ts.linux-foundation.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, bhelgaas@...gle.com,
	alex.williamson@...hat.com
Subject: [PATCH 06/13] iommu: Make use of DMA quirking and ACS enabled check
 for groups

Incorporate DMA quirking and ACS checking into amd_iommu and
intel-iommu.  Note that IOMMU groups are not yet used for
streaming DMA, so this doesn't immediately solve the problems
with broken Ricoh devices.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---

 drivers/iommu/amd_iommu.c   |    3 +++
 drivers/iommu/intel-iommu.c |    3 +++
 drivers/pci/pci.h           |    1 +
 3 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b7e5ddf..a165311 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -291,6 +291,9 @@ static int iommu_init_device(struct device *dev)
 		dma_pdev = pci_get_slot(pdev->bus,
 					PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
 
+	dma_pdev = pci_dma_quirk(dma_pdev);
+	dma_pdev = pci_acs_enabled(dma_pdev);
+
 	group = iommu_group_get(&dma_pdev->dev);
 	if (!group) {
 		group = iommu_group_alloc();
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index e63b33b..5f526c7 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4113,6 +4113,9 @@ static int intel_iommu_add_device(struct device *dev)
 		dma_pdev = pci_get_slot(pdev->bus,
 					PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
 
+	dma_pdev = pci_dma_quirk(dma_pdev);
+	dma_pdev = pci_acs_enabled(dma_pdev);
+
 	group = iommu_group_get(&dma_pdev->dev);
 	if (!group) {
 		group = iommu_group_alloc();
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e494347..e8f2f8f 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -310,6 +310,7 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 }
 
 extern void pci_enable_acs(struct pci_dev *dev);
+extern struct pci_dev *pci_acs_enabled(struct pci_dev *dev);
 
 struct pci_dev_reset_methods {
 	u16 vendor;

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