@@ -415,6 +415,15 @@ config ARM_SMMU_V3_SVA
Say Y here if your system supports SVA extensions such as PCIe PASID
and PRI.
+config ARM_SMMU_V3_IOMMUFD
+ bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)"
+ depends on IOMMUFD
+ help
+ Support for IOMMUFD features intended to support virtual machines
+ with accelerated virtual IOMMUs.
+
+ Say Y here if you are doing development and testing on this feature.
+
config ARM_SMMU_V3_KUNIT_TEST
tristate "KUnit tests for arm-smmu-v3 driver" if !KUNIT_ALL_TESTS
depends on KUNIT
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_ARM_SMMU_V3) += arm_smmu_v3.o
arm_smmu_v3-y := arm-smmu-v3.o
+arm_smmu_v3-$(CONFIG_ARM_SMMU_V3_IOMMUFD) += arm-smmu-v3-iommufd.o
arm_smmu_v3-$(CONFIG_ARM_SMMU_V3_SVA) += arm-smmu-v3-sva.o
arm_smmu_v3-$(CONFIG_TEGRA241_CMDQV) += tegra241-cmdqv.o
new file mode 100644
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES
+ */
+
+#include <uapi/linux/iommufd.h>
+
+#include "arm-smmu-v3.h"
+
+void *arm_smmu_hw_info(struct device *dev, u32 *length, u32 *type)
+{
+ struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+ struct iommu_hw_info_arm_smmuv3 *info;
+ u32 __iomem *base_idr;
+ unsigned int i;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ base_idr = master->smmu->base + ARM_SMMU_IDR0;
+ for (i = 0; i <= 5; i++)
+ info->idr[i] = readl_relaxed(base_idr + i);
+ info->iidr = readl_relaxed(master->smmu->base + ARM_SMMU_IIDR);
+ info->aidr = readl_relaxed(master->smmu->base + ARM_SMMU_AIDR);
+
+ *length = sizeof(*info);
+ *type = IOMMU_HW_INFO_TYPE_ARM_SMMUV3;
+
+ return info;
+}
@@ -3506,6 +3506,7 @@ static struct iommu_ops arm_smmu_ops = {
.identity_domain = &arm_smmu_identity_domain,
.blocked_domain = &arm_smmu_blocked_domain,
.capable = arm_smmu_capable,
+ .hw_info = arm_smmu_hw_info,
.domain_alloc_paging = arm_smmu_domain_alloc_paging,
.domain_alloc_sva = arm_smmu_sva_domain_alloc,
.domain_alloc_user = arm_smmu_domain_alloc_user,
@@ -81,6 +81,8 @@ struct arm_smmu_device;
#define IIDR_REVISION GENMASK(15, 12)
#define IIDR_IMPLEMENTER GENMASK(11, 0)
+#define ARM_SMMU_AIDR 0x1C
+
#define ARM_SMMU_CR0 0x20
#define CR0_ATSCHK (1 << 4)
#define CR0_CMDQEN (1 << 3)
@@ -956,4 +958,11 @@ tegra241_cmdqv_probe(struct arm_smmu_device *smmu)
return ERR_PTR(-ENODEV);
}
#endif /* CONFIG_TEGRA241_CMDQV */
+
+#if IS_ENABLED(CONFIG_ARM_SMMU_V3_IOMMUFD)
+void *arm_smmu_hw_info(struct device *dev, u32 *length, u32 *type);
+#else
+#define arm_smmu_hw_info NULL
+#endif /* CONFIG_ARM_SMMU_V3_IOMMUFD */
+
#endif /* _ARM_SMMU_V3_H */
@@ -484,15 +484,50 @@ struct iommu_hw_info_vtd {
__aligned_u64 ecap_reg;
};
+/**
+ * struct iommu_hw_info_arm_smmuv3 - ARM SMMUv3 hardware information
+ * (IOMMU_HW_INFO_TYPE_ARM_SMMUV3)
+ *
+ * @flags: Must be set to 0
+ * @__reserved: Must be 0
+ * @idr: Implemented features for ARM SMMU Non-secure programming interface
+ * @iidr: Information about the implementation and implementer of ARM SMMU,
+ * and architecture version supported
+ * @aidr: ARM SMMU architecture version
+ *
+ * For the details of @idr, @iidr and @aidr, please refer to the chapters
+ * from 6.3.1 to 6.3.6 in the SMMUv3 Spec.
+ *
+ * User space should read the underlying ARM SMMUv3 hardware information for
+ * the list of supported features.
+ *
+ * Note that these values reflect the raw HW capability, without any insight if
+ * any required kernel driver support is present. Bits may be set indicating the
+ * HW has functionality that is lacking kernel software support, such as BTM. If
+ * a VMM is using this information to construct emulated copies of these
+ * registers it should only forward bits that it knows it can support.
+ *
+ * In future, presence of required kernel support will be indicated in flags.
+ */
+struct iommu_hw_info_arm_smmuv3 {
+ __u32 flags;
+ __u32 __reserved;
+ __u32 idr[6];
+ __u32 iidr;
+ __u32 aidr;
+};
+
/**
* enum iommu_hw_info_type - IOMMU Hardware Info Types
* @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware
* info
* @IOMMU_HW_INFO_TYPE_INTEL_VTD: Intel VT-d iommu info type
+ * @IOMMU_HW_INFO_TYPE_ARM_SMMUV3: ARM SMMUv3 iommu info type
*/
enum iommu_hw_info_type {
IOMMU_HW_INFO_TYPE_NONE = 0,
IOMMU_HW_INFO_TYPE_INTEL_VTD = 1,
+ IOMMU_HW_INFO_TYPE_ARM_SMMUV3 = 2,
};
/**