From: Jiankang Chen <chenjiankang1@huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I63SDZ ------------------- In ascend feature, the SMMU's sid will read from acpi tabels's streamid. To enable the SMMU, we must get SID from ACPI table, and make stall_enabled be true. Signed-off-by: Jiankang Chen <chenjiankang1@huawei.com> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index bd0a596f9863..788310f92642 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2657,6 +2657,9 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) struct arm_smmu_device *smmu; struct arm_smmu_master *master; struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); +#ifdef CONFIG_ASCEND_FEATURES + u32 sid; +#endif if (!fwspec || fwspec->ops != &arm_smmu_ops) return ERR_PTR(-ENODEV); @@ -2703,6 +2706,15 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) smmu->features & ARM_SMMU_FEAT_STALL_FORCE) master->stall_enabled = true; +#ifdef CONFIG_ASCEND_FEATURES + if (!acpi_dev_prop_read_single(ACPI_COMPANION(dev), + "streamid", DEV_PROP_U32, &sid)) { + if (iommu_fwspec_add_ids(dev, &sid, 1)) + dev_info(dev, "failed to add ids\n"); + master->stall_enabled = true; + master->ssid_bits = 0x10; + } +#endif return &smmu->iommu; err_free_master: -- 2.17.1