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authorAntonios Motakis <a.motakis@virtualopensystems.com>2014-05-12 11:44:59 +0530
committerJoerg Roedel <jroedel@suse.de>2014-05-13 19:12:58 +0200
commitbf4a1c920286076609779c2c70c5a2bf69169fc7 (patch)
tree63c13531824d2e32739cd9c87ce4ec6691a0eddd /drivers/iommu
parentd09d78fc986be8355928256d1b86b713588999d7 (diff)
iommu/exynos: Add devices attached to the System MMU to an IOMMU group
Patch written by Antonios Motakis <a.motakis@virtualopensystems.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. Reviewed-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Signed-off-by: Shaik Ameeer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/exynos-iommu.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 3291619c9db0..d18dc379f536 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -964,6 +964,32 @@ 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,
@@ -972,6 +998,8 @@ 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,
};