linux-kernel - [PATCH 19/22] iommu/amd: Put IOMMUv2 devices in a direct mapped domain

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Date:	Thu, 28 May 2015 18:41:42 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	Will Deacon <will.deacon@....com>, Kukjin Kim <kgene@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Robin Murphy <robin.murphy@....com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Oded Gabbay <oded.gabbay@...il.com>, joro@...tes.org,
	jroedel@...e.de, linux-kernel@...r.kernel.org
Subject: [PATCH 19/22] iommu/amd: Put IOMMUv2 devices in a direct mapped domain

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

A device that might be used for HSA needs to be in a direct
mapped domain so that all DMA-API mappings stay alive when
the IOMMUv2 stack is used.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd_iommu.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 33bbb4d..8682786 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2253,6 +2253,8 @@ static void detach_device(struct device *dev)
 
 static int amd_iommu_add_device(struct device *dev)
 {
+	struct iommu_dev_data *dev_data;
+	struct iommu_domain *domain;
 	struct amd_iommu *iommu;
 	u16 devid;
 	int ret;
@@ -2270,7 +2272,18 @@ static int amd_iommu_add_device(struct device *dev)
 	}
 	init_iommu_group(dev);
 
-	dev->archdata.dma_ops = &amd_iommu_dma_ops;
+	dev_data = get_dev_data(dev);
+	if (dev_data && dev_data->iommu_v2)
+		iommu_request_dm_for_dev(dev);
+
+	/* 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_IDENTITY) {
+		dev_data->passthrough = true;
+		dev->archdata.dma_ops = &nommu_dma_ops;
+	} else {
+		dev->archdata.dma_ops = &amd_iommu_dma_ops;
+	}
 
 out:
 	iommu_completion_wait(iommu);
-- 
1.9.1

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