linux-kernel - [PATCH v12 20/31] iommu/exynos: add devices attached to the System MMU to an IOMMU group

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Date:	Sun, 27 Apr 2014 13:07:52 +0530
From:	Shaik Ameer Basha <shaik.ameer@...sung.com>
To:	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:	kgene.kim@...sung.com, tomasz.figa@...il.com,
	pullip.cho@...sung.com, a.motakis@...tualopensystems.com,
	grundler@...omium.org, joro@...tes.org, prathyush.k@...sung.com,
	rahul.sharma@...sung.com, sachin.kamat@...aro.org,
	supash.ramaswamy@...aro.org, Varun.Sethi@...escale.com,
	s.nawrocki@...sung.com, t.figa@...sung.com, joshi@...sung.com
Subject: [PATCH v12 20/31] iommu/exynos: add devices attached to the System MMU
 to an IOMMU group

From: Antonios Motakis <a.motakis@...tualopensystems.com>

Patch written by Antonios Motakis <a.motakis@...tualopensystems.com>:

IOMMU groups are expected by certain users of the IOMMU API,
e.g. VFIO. Since each device is behind its own System MMU, we
can allocate a new IOMMU group for each device.

Reviewd-by: Cho KyongHo <pullip.cho@...sung.com>
Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
---
 drivers/iommu/exynos-iommu.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index c9076e1..5c7f4d2 100755
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1208,6 +1208,32 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain,
 	return phys;
 }
 
+static int exynos_iommu_add_device(struct device *dev)
+{
+	struct iommu_group *group;
+	int ret;
+
+	group = iommu_group_get(dev);
+
+	if (!group) {
+		group = iommu_group_alloc();
+		if (IS_ERR(group)) {
+			dev_err(dev, "Failed to allocate IOMMU group\n");
+			return PTR_ERR(group);
+		}
+	}
+
+	ret = iommu_group_add_device(group, dev);
+	iommu_group_put(group);
+
+	return ret;
+}
+
+static void exynos_iommu_remove_device(struct device *dev)
+{
+	iommu_group_remove_device(dev);
+}
+
 static struct iommu_ops exynos_iommu_ops = {
 	.domain_init = &exynos_iommu_domain_init,
 	.domain_destroy = &exynos_iommu_domain_destroy,
@@ -1216,6 +1242,8 @@ static struct iommu_ops exynos_iommu_ops = {
 	.map = &exynos_iommu_map,
 	.unmap = &exynos_iommu_unmap,
 	.iova_to_phys = &exynos_iommu_iova_to_phys,
+	.add_device = &exynos_iommu_add_device,
+	.remove_device = &exynos_iommu_remove_device,
 	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
 };
 
-- 
1.7.9.5

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