linux-kernel - [PATCH 07/29] ARM: dma-mapping: arm_iommu_attach_device: automatically set max_seg

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Date:	Tue, 05 Aug 2014 12:47:35 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 07/29] ARM: dma-mapping: arm_iommu_attach_device: automatically
 set max_seg_size

If device has no max_seg_size set, we assume that there is no limit and
force it to DMA_BIT_MASK(32) to always use contiguous mappings in DMA
address space.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7a996aa..8161102 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -2051,6 +2051,22 @@ int arm_iommu_attach_device(struct device *dev,
 {
 	int err;
 
+	/*
+	 * if device has no max_seg_size set, we assume that there is no limit
+	 * and force it to DMA_BIT_MASK(32) to always use contiguous mappings
+	 * in DMA address space
+	 */
+	if (!dev->dma_parms) {
+		dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
+		if (!dev->dma_parms)
+			return -ENOMEM;
+	}
+	if (!dev->dma_parms->max_segment_size) {
+		err = dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
+		if (err)
+			return err;
+	}
+
 	err = iommu_attach_device(mapping->domain, dev);
 	if (err)
 		return err;
-- 
1.9.2

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