From 5fc63a7c446e998d01a68b108fe007be675aced7 Mon Sep 17 00:00:00 2001 From: Antonios Motakis Date: Fri, 18 Oct 2013 16:08:29 +0100 Subject: [PATCH] iommu/arm-smmu: add devices attached to the SMMU to an IOMMU group IOMMU groups are expected by certain users of the IOMMU API, e.g. VFIO. Add new devices found by the SMMU driver to an IOMMU group to satisfy those users. Acked-by: Alex Williamson Signed-off-by: Antonios Motakis Signed-off-by: Will Deacon --- drivers/iommu/arm-smmu.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index e46a88700b68..879da20617fb 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1494,6 +1494,13 @@ static int arm_smmu_add_device(struct device *dev) { struct arm_smmu_device *child, *parent, *smmu; struct arm_smmu_master *master = NULL; + struct iommu_group *group; + int ret; + + if (dev->archdata.iommu) { + dev_warn(dev, "IOMMU driver already assigned to device\n"); + return -EINVAL; + } spin_lock(&arm_smmu_devices_lock); list_for_each_entry(parent, &arm_smmu_devices, list) { @@ -1526,13 +1533,23 @@ static int arm_smmu_add_device(struct device *dev) if (!master) return -ENODEV; + 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); dev->archdata.iommu = smmu; - return 0; + + return ret; } static void arm_smmu_remove_device(struct device *dev) { dev->archdata.iommu = NULL; + iommu_group_remove_device(dev); } static struct iommu_ops arm_smmu_ops = {