linux-kernel - [PATCH v3 17/25] iommu/amd: Prepare for multiple DMA domain types

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Message-Id: <51e020d80bfc7b2dcc90f78fad93faa697644723.1628094601.git.robin.murphy@arm.com>
Date:   Wed,  4 Aug 2021 18:15:45 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suravee.suthikulpanit@....com, baolu.lu@...ux.intel.com,
        john.garry@...wei.com, dianders@...omium.org, rajatja@...gle.com,
        chenxiang66@...ilicon.com
Subject: [PATCH v3 17/25] iommu/amd: Prepare for multiple DMA domain types

The DMA ops reset/setup can simply be unconditional, since
iommu-dma already knows only to touch DMA domains.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/amd/iommu.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 92f7cbe3d14a..f8cd945f1776 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1706,14 +1706,9 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
 
 static void amd_iommu_probe_finalize(struct device *dev)
 {
-	struct iommu_domain *domain;
-
 	/* Domains are initialized for this device - have a look what we ended up with */
-	domain = iommu_get_domain_for_dev(dev);
-	if (domain->type == IOMMU_DOMAIN_DMA)
-		iommu_setup_dma_ops(dev, 0, U64_MAX);
-	else
-		set_dma_ops(dev, NULL);
+	set_dma_ops(dev, NULL);
+	iommu_setup_dma_ops(dev, 0, U64_MAX);
 }
 
 static void amd_iommu_release_device(struct device *dev)
-- 
2.25.1