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Wed, 30 Oct 2024 14:35:44 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 04/10] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE Date: Wed, 30 Oct 2024 14:35:30 -0700 Message-ID: <9dc0f34fcb886f4c9db8d7cf8c558950049b8968.1730313494.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000066EA:EE_|CH0PR12MB8577:EE_ X-MS-Office365-Filtering-Correlation-Id: f0218f30-3968-442d-15f9-08dcf92ade5e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|7416014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?EfUfKsCqwGTvTAZH95VfDTHaWgVYH1sQEAYtjDzOSmQH+a/ukEXjka+h8qQW?= =?us-ascii?Q?Pr4r07Hju1pFrzrMJXgPHATqjmrDdpCHMKoeb3h2KhGTxwW3+Dn22Pw6SFqR?= =?us-ascii?Q?P5kjaU5lryDDBwfBA4pLhLU0EZ86PcMFgYerBi2yGQEOODfB/nMpSSSDmlfi?= =?us-ascii?Q?n4erX4qBgBBOfAh5HpI+6pbyp2iUg2GJgnOD0yqbGZLU2lodimduFLWN0O05?= =?us-ascii?Q?XkF3zn2yCPZhHrA99u4Omo4JtDYpWQmtSOqLv0hRx3PGxpPGroFt7wVordlV?= =?us-ascii?Q?jW3VIKN/DdmV4NO+OEZLK6Vxp3ctGQHDwp56Lutr2Ek6uMUxISVfwdIpcVsB?= =?us-ascii?Q?aGZpi+9gyPcXS9ISCjebpppzbRQ2twbk5+f4KKNeSRbQkvXqsimBFVd9wi51?= =?us-ascii?Q?8wwdyUiNSYf0AUu8apyEhPpVdiKEJXTRx923wHF9sLv/tytmPpAcxz8U5V2Q?= =?us-ascii?Q?PtmhSqnrF8vXPJEl4waFzpGtBki0moawNosJxT2qL1wnVD0PugJImD50vf+B?= =?us-ascii?Q?k5kwZvnIaNROltRa4GdbE4+4m0ABn3uwZty176qvODn2mxvW7KDHrVbyZPAy?= =?us-ascii?Q?I9fiYJ+tin5JCAuwUBJ/n0wCQRXMQ3GrqPVxsdWBiEzyEi+nHKCVhxOIY3fm?= =?us-ascii?Q?wWHmmDdbMN9Y70GkjyYQJDwbL2c9KDVYA27XRLRLVnxT6a/5gJGmkXc+jXFi?= =?us-ascii?Q?2S4Elc+Nq982Snkm9LRKk2eO27zMCVI0ZtK4K0vzx0dX1UHEyNsE1TCpNZBe?= =?us-ascii?Q?9hQIOYvLRTP/D+UrwQQf3a6Vxce0t/SH3aZs5oVJY4TlCia+FOEj2yCvF+MS?= =?us-ascii?Q?lbC0hGcTZpwgUHsxb+stTgy+NU+EebVpmj/hrZCQhbPGQ05+jaXRBLH62pzR?= =?us-ascii?Q?//Wka9lHYbLcDAeKUuoR1/8HujYL7FXEWMOWSogwfNnhlUS78M2db6mhFsjp?= =?us-ascii?Q?9Hs6U3x7nZhEhL3VKmQfZREIcZAMriWklSCWES7mbrGsR/rd5FX8BKdVSqGA?= =?us-ascii?Q?+7DStmG7PoPAuK26iADsmA61wOLnaJT+WBZJkexdpQfVISPdUNK3cAi/U7CM?= =?us-ascii?Q?LNuP6xFATDsLFfk/8vpJlGe+V8b/0Vw3PgvdzJiD7RQKmsbIct7ID2qJic+d?= =?us-ascii?Q?HsfF6aV9E0Oeu9KQj9pQqozjBpeIEAqDqEE6itRWMf8USvVVzSgKQ5dEpH9t?= =?us-ascii?Q?BnmenwtgyHhIHqzrsT0lBe5AC35Tl5A8fJCVeOTorxK3H79LH01TGsMUMVMn?= =?us-ascii?Q?LfCKBt3shWyfl5Ky+uesFMbwejoD4arzEBMPYQKGO7N2NbrCoDF+KAJ+3zqC?= =?us-ascii?Q?/ACBosZwdpYktcNrpSuCnTAAsgAkrgTfyvb/BLavqU9Qwb+TMqKDzd/ncCMm?= =?us-ascii?Q?9N/F4o6vgOuBJeY54VCNFcNFcrbe96kHSftQvMvYzHu1Qjuv2w=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700013)(7416014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2024 21:36:09.3480 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0218f30-3968-442d-15f9-08dcf92ade5e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000066EA.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB8577 Content-Type: text/plain; charset="utf-8" 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. Since both the HWPT-based and vIOMMU-based invalidation pathways check own cache invalidation op, remove the WARN_ON_ONCE in the allocator. Update the uAPI, kdoc, and selftest case accordingly. Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen --- include/uapi/linux/iommufd.h | 9 ++++-- drivers/iommu/iommufd/hw_pagetable.c | 40 +++++++++++++++++++------ tools/testing/selftests/iommu/iommufd.c | 4 +-- 3 files changed, 39 insertions(+), 14 deletions(-) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 9b5236004b8e..badb41c5bfa4 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -700,7 +700,7 @@ 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 invalidat= ion * data. * @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the d= ata @@ -711,8 +711,11 @@ struct iommu_hwpt_vtd_s1_invalidate { * Output the number of requests successfully handled by kerne= l. * @__reserved: Must be 0. * - * Invalidate the iommu cache for user-managed page table. Modifications o= n a - * user-managed page table should be followed by this operation to sync ca= che. + * Invalidate iommu cache for user-managed page table or vIOMMU. Modificat= ions + * 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 descri= ptor + * 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 a= rray * that has a total size of @entry_len * @entry_num. * diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/h= w_pagetable.c index 384afa374d25..d8f8b0642a26 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -251,8 +251,7 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx, } hwpt->domain->owner =3D ops; =20 - if (WARN_ON_ONCE(hwpt->domain->type !=3D IOMMU_DOMAIN_NESTED || - !hwpt->domain->ops->cache_invalidate_user)) { + if (WARN_ON_ONCE(hwpt->domain->type !=3D IOMMU_DOMAIN_NESTED)) { rc =3D -EINVAL; goto out_abort; } @@ -482,7 +481,7 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd) .entry_len =3D cmd->entry_len, .entry_num =3D cmd->entry_num, }; - struct iommufd_hw_pagetable *hwpt; + struct iommufd_object *pt_obj; u32 done_num =3D 0; int rc; =20 @@ -496,17 +495,40 @@ int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd) goto out; } =20 - hwpt =3D iommufd_get_hwpt_nested(ucmd, cmd->hwpt_id); - if (IS_ERR(hwpt)) { - rc =3D PTR_ERR(hwpt); + pt_obj =3D iommufd_get_object(ucmd->ictx, cmd->hwpt_id, IOMMUFD_OBJ_ANY); + if (IS_ERR(pt_obj)) { + rc =3D PTR_ERR(pt_obj); goto out; } + if (pt_obj->type =3D=3D IOMMUFD_OBJ_HWPT_NESTED) { + struct iommufd_hw_pagetable *hwpt =3D + container_of(pt_obj, struct iommufd_hw_pagetable, obj); + + if (!hwpt->domain->ops || + !hwpt->domain->ops->cache_invalidate_user) { + rc =3D -EOPNOTSUPP; + goto out_put_pt; + } + rc =3D hwpt->domain->ops->cache_invalidate_user(hwpt->domain, + &data_array); + } else if (pt_obj->type =3D=3D IOMMUFD_OBJ_VIOMMU) { + struct iommufd_viommu *viommu =3D + container_of(pt_obj, struct iommufd_viommu, obj); + + if (!viommu->ops || !viommu->ops->cache_invalidate) { + rc =3D -EOPNOTSUPP; + goto out_put_pt; + } + rc =3D viommu->ops->cache_invalidate(viommu, &data_array); + } else { + rc =3D -EINVAL; + goto out_put_pt; + } =20 - rc =3D hwpt->domain->ops->cache_invalidate_user(hwpt->domain, - &data_array); done_num =3D data_array.entry_num; =20 - iommufd_put_object(ucmd->ictx, &hwpt->obj); +out_put_pt: + iommufd_put_object(ucmd->ictx, pt_obj); out: cmd->entry_num =3D done_num; if (iommufd_ucmd_respond(ucmd, sizeof(*cmd))) diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selfte= sts/iommu/iommufd.c index 2610117cb39e..c47ad6502efc 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -367,9 +367,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested) EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, parent_hwpt_id)); =20 - /* hwpt_invalidate only supports a user-managed hwpt (nested) */ + /* hwpt_invalidate does not support a parent hwpt */ num_inv =3D 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); --=20 2.43.0