linux-kernel - [PATCH 15/22] iommu/amd: Use default domain if available for DMA-API

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Message-Id: <1432831305-11126-16-git-send-email-joro@8bytes.org>
Date:	Thu, 28 May 2015 18:41:38 +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 15/22] iommu/amd: Use default domain if available for DMA-API

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

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

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 9da3f0e..dc8e44b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2495,12 +2495,19 @@ void amd_iommu_init_notifier(void)
 static struct protection_domain *get_domain(struct device *dev)
 {
 	struct protection_domain *domain;
+	struct iommu_domain *io_domain;
 	struct dma_ops_domain *dma_dom;
 	u16 devid = get_device_id(dev);
 
 	if (!check_device(dev))
 		return ERR_PTR(-EINVAL);
 
+	io_domain = iommu_get_domain_for_dev(dev);
+	if (io_domain) {
+		domain = to_pdomain(io_domain);
+		return domain;
+	}
+
 	domain = domain_for_device(dev);
 	if (domain != NULL && !dma_ops_domain(domain))
 		return ERR_PTR(-EBUSY);
-- 
1.9.1

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