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Subject[PATCH v13 14/19] iommu/exynos: add devices attached to the System MMU to an IOMMU group
Date
From: Antonios Motakis <a.motakis@virtualopensystems.com>

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>
---
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 3291619..d18dc37 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,
};

--
1.7.9.5


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