linux-kernel - [PATCH 03/16] iommu: Only allow iommu

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Date:	Thu, 26 Mar 2015 13:43:06 +0100
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>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, linux-tegra@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>, jroedel@...e.de
Subject: [PATCH 03/16] iommu: Only allow iommu_map/unmap for paging domains

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

Check for the new __IOMMU_DOMAIN_PAGING flag before calling
into the iommu drivers ->map and ->unmap call-backs.

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

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 4920605..656b949 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1063,6 +1063,9 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 		     domain->ops->pgsize_bitmap == 0UL))
 		return -ENODEV;
 
+	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
+		return -EINVAL;
+
 	/* find out the minimum page size supported */
 	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
 
@@ -1114,6 +1117,9 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
 		     domain->ops->pgsize_bitmap == 0UL))
 		return -ENODEV;
 
+	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
+		return -EINVAL;
+
 	/* find out the minimum page size supported */
 	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
 
-- 
1.9.1

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