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Wysocki" , Shameerali Kolothum Thodi , Mostafa Saleh Subject: [PATCH v4 12/12] iommu/arm-smmu-v3: Support IOMMU_HWPT_INVALIDATE using a VIOMMU object Date: Wed, 30 Oct 2024 21:20:56 -0300 Message-ID: <12-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com> In-Reply-To: <0-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com> References: X-ClientProxiedBy: BN9PR03CA0275.namprd03.prod.outlook.com (2603:10b6:408:f5::10) To CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB8659:EE_|DM4PR12MB7573:EE_ X-MS-Office365-Filtering-Correlation-Id: a250627b-ff5b-48f0-2132-08dcf941e3f1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|376014|7416014|366016|1800799024|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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Add struct iommu_viommu_arm_smmuv3_invalidate defining invalidation entries that are simply in the native format of a 128-bit TLBI command. Scan those commands against the permitted command list and fix their VMID/SID fields to match what is stored in the vIOMMU. Co-developed-by: Eric Auger Signed-off-by: Eric Auger Co-developed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 134 ++++++++++++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 6 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 5 + include/uapi/linux/iommufd.h | 24 ++++ 4 files changed, 166 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index ab515706d48463..2cfa1557817bc1 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -209,8 +209,134 @@ arm_vsmmu_alloc_domain_nested(struct iommufd_viommu *viommu, u32 flags, return &nested_domain->domain; } +static int arm_vsmmu_vsid_to_sid(struct arm_vsmmu *vsmmu, u32 vsid, u32 *sid) +{ + struct arm_smmu_master *master; + struct device *dev; + int ret = 0; + + xa_lock(&vsmmu->core.vdevs); + dev = iommufd_viommu_find_dev(&vsmmu->core, (unsigned long)vsid); + if (!dev) { + ret = -EIO; + goto unlock; + } + master = dev_iommu_priv_get(dev); + + /* At this moment, iommufd only supports PCI device that has one SID */ + if (sid) + *sid = master->streams[0].id; +unlock: + xa_unlock(&vsmmu->core.vdevs); + return ret; +} + +/* This is basically iommu_viommu_arm_smmuv3_invalidate in u64 for conversion */ +struct arm_vsmmu_invalidation_cmd { + union { + u64 cmd[2]; + struct iommu_viommu_arm_smmuv3_invalidate ucmd; + }; +}; + +/* + * Convert, in place, the raw invalidation command into an internal format that + * can be passed to arm_smmu_cmdq_issue_cmdlist(). Internally commands are + * stored in CPU endian. + * + * Enforce the VMID or SID on the command. + */ +static int arm_vsmmu_convert_user_cmd(struct arm_vsmmu *vsmmu, + struct arm_vsmmu_invalidation_cmd *cmd) +{ + /* Commands are le64 stored in u64 */ + cmd->cmd[0] = le64_to_cpu(cmd->ucmd.cmd[0]); + cmd->cmd[1] = le64_to_cpu(cmd->ucmd.cmd[1]); + + switch (cmd->cmd[0] & CMDQ_0_OP) { + case CMDQ_OP_TLBI_NSNH_ALL: + /* Convert to NH_ALL */ + cmd->cmd[0] = CMDQ_OP_TLBI_NH_ALL | + FIELD_PREP(CMDQ_TLBI_0_VMID, vsmmu->vmid); + cmd->cmd[1] = 0; + break; + case CMDQ_OP_TLBI_NH_VA: + case CMDQ_OP_TLBI_NH_VAA: + case CMDQ_OP_TLBI_NH_ALL: + case CMDQ_OP_TLBI_NH_ASID: + cmd->cmd[0] &= ~CMDQ_TLBI_0_VMID; + cmd->cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, vsmmu->vmid); + break; + case CMDQ_OP_ATC_INV: + case CMDQ_OP_CFGI_CD: + case CMDQ_OP_CFGI_CD_ALL: { + u32 sid, vsid = FIELD_GET(CMDQ_CFGI_0_SID, cmd->cmd[0]); + + if (arm_vsmmu_vsid_to_sid(vsmmu, vsid, &sid)) + return -EIO; + cmd->cmd[0] &= ~CMDQ_CFGI_0_SID; + cmd->cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SID, sid); + break; + } + default: + return -EIO; + } + return 0; +} + +static int arm_vsmmu_cache_invalidate(struct iommufd_viommu *viommu, + struct iommu_user_data_array *array) +{ + struct arm_vsmmu *vsmmu = container_of(viommu, struct arm_vsmmu, core); + struct arm_smmu_device *smmu = vsmmu->smmu; + struct arm_vsmmu_invalidation_cmd *last; + struct arm_vsmmu_invalidation_cmd *cmds; + struct arm_vsmmu_invalidation_cmd *cur; + struct arm_vsmmu_invalidation_cmd *end; + int ret; + + cmds = kcalloc(array->entry_num, sizeof(*cmds), GFP_KERNEL); + if (!cmds) + return -ENOMEM; + cur = cmds; + end = cmds + array->entry_num; + + static_assert(sizeof(*cmds) == 2 * sizeof(u64)); + ret = iommu_copy_struct_from_full_user_array( + cmds, sizeof(*cmds), array, + IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3); + if (ret) + goto out; + + last = cmds; + while (cur != end) { + ret = arm_vsmmu_convert_user_cmd(vsmmu, cur); + if (ret) + goto out; + + /* FIXME work in blocks of CMDQ_BATCH_ENTRIES and copy each block? */ + cur++; + if (cur != end && (cur - last) != CMDQ_BATCH_ENTRIES - 1) + continue; + + /* FIXME always uses the main cmdq rather than trying to group by type */ + ret = arm_smmu_cmdq_issue_cmdlist(smmu, &smmu->cmdq, last->cmd, + cur - last, true); + if (ret) { + cur--; + goto out; + } + last = cur; + } +out: + array->entry_num = cur - cmds; + kfree(cmds); + return ret; +} + static const struct iommufd_viommu_ops arm_vsmmu_ops = { .alloc_domain_nested = arm_vsmmu_alloc_domain_nested, + .cache_invalidate = arm_vsmmu_cache_invalidate, }; struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, @@ -233,6 +359,14 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, if (s2_parent->smmu != master->smmu) return ERR_PTR(-EINVAL); + /* + * FORCE_SYNC is not set with FEAT_NESTING. Some study of the exact HW + * defect is needed to determine if arm_vsmmu_cache_invalidate() needs + * any change to remove this. + */ + if (WARN_ON(smmu->options & ARM_SMMU_OPT_CMDQ_FORCE_SYNC)) + return ERR_PTR(-EOPNOTSUPP); + /* * Must support some way to prevent the VM from bypassing the cache * because VFIO currently does not do any cache maintenance. canwbs 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 b47f80224781ba..2a9f2d1d3ed910 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -766,9 +766,9 @@ static void arm_smmu_cmdq_write_entries(struct arm_smmu_cmdq *cmdq, u64 *cmds, * insert their own list of commands then all of the commands from one * CPU will appear before any of the commands from the other CPU. */ -static int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu, - struct arm_smmu_cmdq *cmdq, - u64 *cmds, int n, bool sync) +int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu, + struct arm_smmu_cmdq *cmdq, u64 *cmds, int n, + bool sync) { u64 cmd_sync[CMDQ_ENT_DWORDS]; u32 prod; diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 01c1d16dc0c81a..af25f092303f10 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -529,6 +529,7 @@ struct arm_smmu_cmdq_ent { #define CMDQ_OP_TLBI_NH_ALL 0x10 #define CMDQ_OP_TLBI_NH_ASID 0x11 #define CMDQ_OP_TLBI_NH_VA 0x12 + #define CMDQ_OP_TLBI_NH_VAA 0x13 #define CMDQ_OP_TLBI_EL2_ALL 0x20 #define CMDQ_OP_TLBI_EL2_ASID 0x21 #define CMDQ_OP_TLBI_EL2_VA 0x22 @@ -951,6 +952,10 @@ void arm_smmu_attach_commit(struct arm_smmu_attach_state *state); void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master, const struct arm_smmu_ste *target); +int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu, + struct arm_smmu_cmdq *cmdq, u64 *cmds, int n, + bool sync); + #ifdef CONFIG_ARM_SMMU_V3_SVA bool arm_smmu_sva_supported(struct arm_smmu_device *smmu); bool arm_smmu_master_sva_supported(struct arm_smmu_master *master); diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 125b51b78ad8f9..2a492e054fb7c9 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -688,9 +688,11 @@ struct iommu_hwpt_get_dirty_bitmap { * enum iommu_hwpt_invalidate_data_type - IOMMU HWPT Cache Invalidation * Data Type * @IOMMU_HWPT_INVALIDATE_DATA_VTD_S1: Invalidation data for VTD_S1 + * @IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3: Invalidation data for ARM SMMUv3 */ enum iommu_hwpt_invalidate_data_type { IOMMU_HWPT_INVALIDATE_DATA_VTD_S1 = 0, + IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3 = 1, }; /** @@ -729,6 +731,28 @@ struct iommu_hwpt_vtd_s1_invalidate { __u32 __reserved; }; +/** + * struct iommu_viommu_arm_smmuv3_invalidate - ARM SMMUv3 cahce invalidation + * (IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3) + * @cmd: 128-bit cache invalidation command that runs in SMMU CMDQ. + * Must be little-endian. + * + * Supported command list only when passing in a vIOMMU via @hwpt_id: + * CMDQ_OP_TLBI_NSNH_ALL + * CMDQ_OP_TLBI_NH_VA + * CMDQ_OP_TLBI_NH_VAA + * CMDQ_OP_TLBI_NH_ALL + * CMDQ_OP_TLBI_NH_ASID + * CMDQ_OP_ATC_INV + * CMDQ_OP_CFGI_CD + * CMDQ_OP_CFGI_CD_ALL + * + * -EIO will be returned if the command is not supported. + */ +struct iommu_viommu_arm_smmuv3_invalidate { + __aligned_le64 cmd[2]; +}; + /** * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE) * @size: sizeof(struct iommu_hwpt_invalidate)