From 21d3c0402a396f8db9856792193f5e1ee1818aa7 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Fri, 11 Sep 2020 00:16:43 -0700 Subject: iommu/tegra-smmu: Allow to group clients in same swgroup There can be clients using the same swgroup in DT, for example i2c0 and i2c1. The current driver will add them to separate IOMMU groups, though it has implemented device_group() callback which is to group devices using different swgroups like DC and DCB. All clients having the same swgroup should be also added to the same IOMMU group so as to share an asid. Otherwise, the asid register may get overwritten every time a new device is attached. Signed-off-by: Nicolin Chen Acked-by: Thierry Reding Link: https://lore.kernel.org/r/20200911071643.17212-4-nicoleotsuka@gmail.com Signed-off-by: Joerg Roedel --- drivers/iommu/tegra-smmu.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'drivers/iommu/tegra-smmu.c') diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index e6d142458950..0becdbfea306 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -23,6 +23,7 @@ struct tegra_smmu_group { struct tegra_smmu *smmu; const struct tegra_smmu_group_soc *soc; struct iommu_group *group; + unsigned int swgroup; }; struct tegra_smmu { @@ -909,14 +910,14 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu, struct tegra_smmu_group *group; struct iommu_group *grp; + /* Find group_soc associating with swgroup */ soc = tegra_smmu_find_group(smmu, swgroup); - if (!soc) - return NULL; mutex_lock(&smmu->lock); + /* Find existing iommu_group associating with swgroup or group_soc */ list_for_each_entry(group, &smmu->groups, list) - if (group->soc == soc) { + if ((group->swgroup == swgroup) || (soc && group->soc == soc)) { grp = iommu_group_ref_get(group->group); mutex_unlock(&smmu->lock); return grp; @@ -929,6 +930,7 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu, } INIT_LIST_HEAD(&group->list); + group->swgroup = swgroup; group->smmu = smmu; group->soc = soc; @@ -940,7 +942,8 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu, } iommu_group_set_iommudata(group->group, group, tegra_smmu_group_release); - iommu_group_set_name(group->group, soc->name); + if (soc) + iommu_group_set_name(group->group, soc->name); list_add_tail(&group->list, &smmu->groups); mutex_unlock(&smmu->lock); -- cgit v1.2.3