Patch "arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA" has been added to the 4.9-stable tree

Patch "arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-dma-mapping-only-swizzle-dma-ops-for-iommu_domain_dma.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Nov  9 09:48:01 CET 2017
From: Will Deacon <will.deacon@arm.com>
Date: Fri, 6 Jan 2017 10:49:12 +0000
Subject: arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA

From: Will Deacon <will.deacon@arm.com>


[ Upstream commit 4a8d8a14c0d08c2437cb80c05e88f6cc1ca3fb2c ]

The arm64 DMA-mapping implementation sets the DMA ops to the IOMMU DMA
ops if we detect that an IOMMU is present for the master and the DMA
ranges are valid.

In the case when the IOMMU domain for the device is not of type
IOMMU_DOMAIN_DMA, then we have no business swizzling the ops, since
we're not in control of the underlying address space. This patch leaves
the DMA ops alone for masters attached to non-DMA IOMMU domains.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm64/mm/dma-mapping.c |   17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -836,14 +836,21 @@ static bool do_iommu_attach(struct devic
 	 * then the IOMMU core will have already configured a group for this
 	 * device, and allocated the default domain for that group.
 	 */
-	if (!domain || iommu_dma_init_domain(domain, dma_base, size, dev)) {
-		pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
-			dev_name(dev));
-		return false;
+	if (!domain)
+		goto out_err;
+
+	if (domain->type == IOMMU_DOMAIN_DMA) {
+		if (iommu_dma_init_domain(domain, dma_base, size, dev))
+			goto out_err;
+
+		dev->archdata.dma_ops = &iommu_dma_ops;
 	}
 
-	dev->archdata.dma_ops = &iommu_dma_ops;
 	return true;
+out_err:
+	pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
+		 dev_name(dev));
+	return false;
 }
 
 static void queue_iommu_attach(struct device *dev, const struct iommu_ops *ops,


Patches currently in stable-queue which might be from will.deacon@arm.com are

queue-4.9/iommu-arm-smmu-v3-clear-prior-settings-when-updating-stes.patch
queue-4.9/arm64-dma-mapping-only-swizzle-dma-ops-for-iommu_domain_dma.patch