linux-kernel - [PATCH v4 02/16] iommu/of: Request ACS from the PCI core when configuring IOMMU linkage

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Message-Id: <20191219120352.382-3-will@kernel.org>
Date:   Thu, 19 Dec 2019 12:03:38 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linuxfoundation.org
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        John Garry <john.garry@...wei.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Joerg Roedel <joro@...tes.org>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH v4 02/16] iommu/of: Request ACS from the PCI core when configuring IOMMU linkage

To avoid having to export 'pci_request_acs()' to modular IOMMU drivers,
move the call into the 'of_dma_configure()' path in a similar manner to
the way in which ACS is configured when probing via ACPI/IORT.

Signed-off-by: Will Deacon <will@...nel.org>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 026ad2b29dcd..4d2f02132e7a 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -179,6 +179,7 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
 			.np = master_np,
 		};
 
+		pci_request_acs();
 		err = pci_for_each_dma_alias(to_pci_dev(dev),
 					     of_pci_iommu_init, &info);
 	} else if (dev_is_fsl_mc(dev)) {
-- 
2.24.1.735.g03f4e72817-goog