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Fri, 25 Oct 2024 16:50:53 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 05/13] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE Date: Fri, 25 Oct 2024 16:50:34 -0700 Message-ID: <6b8bb8f2319bf26ead928321f609105e4e5eecf4.1729897278.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023CF:EE_|DS0PR12MB8456:EE_ X-MS-Office365-Filtering-Correlation-Id: 666c01af-2ce1-4125-6306-08dcf54fe366 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|36860700013|376014|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2024 23:51:04.5814 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 666c01af-2ce1-4125-6306-08dcf54fe366 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CF.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8456 With a vIOMMU object, use space can flush any IOMMU related cache that can be directed via a vIOMMU object. It is similar to the IOMMU_HWPT_INVALIDATE uAPI, but can cover a wider range than IOTLB, e.g. device/desciprtor cache. Allow hwpt_id of the iommu_hwpt_invalidate structure to carry a viommu_id, and reuse the IOMMU_HWPT_INVALIDATE uAPI for vIOMMU invalidations. Drivers can define different structures for vIOMMU invalidations v.s. HWPT ones. Update the uAPI, kdoc, and selftest case accordingly. Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- include/uapi/linux/iommufd.h | 9 ++++--- drivers/iommu/iommufd/hw_pagetable.c | 32 +++++++++++++++++++------ tools/testing/selftests/iommu/iommufd.c | 4 ++-- 3 files changed, 33 insertions(+), 12 deletions(-) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index b699ecb7aa9c..c2c5f49fdf17 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -730,7 +730,7 @@ struct iommu_hwpt_vtd_s1_invalidate { /** * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE) * @size: sizeof(struct iommu_hwpt_invalidate) - * @hwpt_id: ID of a nested HWPT for cache invalidation + * @hwpt_id: ID of a nested HWPT or a vIOMMU, for cache invalidation * @data_uptr: User pointer to an array of driver-specific cache invalidation * data. * @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the data @@ -741,8 +741,11 @@ struct iommu_hwpt_vtd_s1_invalidate { * Output the number of requests successfully handled by kernel. * @__reserved: Must be 0. * - * Invalidate the iommu cache for user-managed page table. Modifications on a - * user-managed page table should be followed by this operation to sync cache. + * Invalidate iommu cache for user-managed page table or vIOMMU. Modifications + * on a user-managed page table should be followed by this operation, if a HWPT + * is passed in via @hwpt_id. Other caches, such as device cache or descriptor + * cache can be flushed if a vIOMMU is passed in via the @hwpt_id field. + * * Each ioctl can support one or more cache invalidation requests in the array * that has a total size of @entry_len * @entry_num. * diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index fd260a67b82c..5301ba69fb8a 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -483,7 +483,7 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd) .entry_len = cmd->entry_len, .entry_num = cmd->entry_num, }; - struct iommufd_hw_pagetable *hwpt; + struct iommufd_object *pt_obj; u32 done_num = 0; int rc; @@ -497,17 +497,35 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd) goto out; } - hwpt = iommufd_get_hwpt_nested(ucmd, cmd->hwpt_id); - if (IS_ERR(hwpt)) { - rc = PTR_ERR(hwpt); + pt_obj = iommufd_get_object(ucmd->ictx, cmd->hwpt_id, IOMMUFD_OBJ_ANY); + if (IS_ERR(pt_obj)) { + rc = PTR_ERR(pt_obj); goto out; } + if (pt_obj->type == IOMMUFD_OBJ_HWPT_NESTED) { + struct iommufd_hw_pagetable *hwpt = + container_of(pt_obj, struct iommufd_hw_pagetable, obj); + + rc = hwpt->domain->ops->cache_invalidate_user(hwpt->domain, + &data_array); + } else if (pt_obj->type == IOMMUFD_OBJ_VIOMMU) { + struct iommufd_viommu *viommu = + container_of(pt_obj, struct iommufd_viommu, obj); + + if (!viommu->ops || !viommu->ops->cache_invalidate) { + rc = -EOPNOTSUPP; + goto out_put_pt; + } + rc = viommu->ops->cache_invalidate(viommu, &data_array); + } else { + rc = -EINVAL; + goto out_put_pt; + } - rc = hwpt->domain->ops->cache_invalidate_user(hwpt->domain, - &data_array); done_num = data_array.entry_num; - iommufd_put_object(ucmd->ictx, &hwpt->obj); +out_put_pt: + iommufd_put_object(ucmd->ictx, pt_obj); out: cmd->entry_num = done_num; if (iommufd_ucmd_respond(ucmd, sizeof(*cmd))) diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index 93255403dee4..44fbc7e5aa2e 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -362,9 +362,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested) EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, parent_hwpt_id)); - /* hwpt_invalidate only supports a user-managed hwpt (nested) */ + /* hwpt_invalidate does not support a parent hwpt */ num_inv = 1; - test_err_hwpt_invalidate(ENOENT, parent_hwpt_id, inv_reqs, + test_err_hwpt_invalidate(EINVAL, parent_hwpt_id, inv_reqs, IOMMU_HWPT_INVALIDATE_DATA_SELFTEST, sizeof(*inv_reqs), &num_inv); assert(!num_inv);