linux-kernel - [PATCH] iommu/amd: Allow non-ATS devices in IOMMUv2 domains

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Date:	Thu, 30 Jul 2015 12:05:24 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Oded Gabbay <oded.gabbay@...il.com>,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH] iommu/amd: Allow non-ATS devices in IOMMUv2 domains

From: Joerg Roedel <jroedel@...e.de>

With the grouping of multi-function devices a non-ATS
capable device might also end up in the same domain as an
IOMMUv2 capable device.
So handle this situation gracefully and don't consider it a
bug anymore.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd_iommu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index fa9508b..658ee39 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3318,7 +3318,12 @@ static int __flush_pasid(struct protection_domain *domain, int pasid,
 		struct amd_iommu *iommu;
 		int qdep;
 
-		BUG_ON(!dev_data->ats.enabled);
+		/*
+		   There might be non-IOMMUv2 capable devices in an IOMMUv2
+		 * domain.
+		 */
+		if (!dev_data->ats.enabled)
+			continue;
 
 		qdep  = dev_data->ats.qdep;
 		iommu = amd_iommu_rlookup_table[dev_data->devid];
-- 
1.9.1

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