From: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx> Patch written by Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>: 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@xxxxxxxxxxx> Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html