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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?m3+QK3tkM7cFT7A1TlmAVbITdeP3VIkm1mdWcwpFeeKYE/JhUoJhirQKPUhA?= =?us-ascii?Q?auuc/hkwFSjZ70CZ0F8aq5pGeBXVpEZXqOYsqapCQciyqT2eovlv8WpjUxKv?= =?us-ascii?Q?XTaI7fI1C+ch/pPbOblzWTnVAXIlsyyA+M/Ym6pb1aXFGpLTniYv1888hOzx?= =?us-ascii?Q?Uj2wKGpwfnQCOeClE4lx4FVp8vKTd8cErsRwH/nJuDvy469A20JgELwnFUmv?= =?us-ascii?Q?Ar0Opm+vlfWxf3rrG9UnuFKR8twWUcbtEDtL/HlkHXxLJ9gRiK2EhNS8tlah?= =?us-ascii?Q?ZeV5L7EHs9jTeu6gq4Gj/UrRL+fBc5lQu237LZ5Zab5ZPejNbg8N6fv+Gx0k?= =?us-ascii?Q?CU0i2OY4I7IIKBOui3vubcEUxfMDMuftc/RKSMykqh12FsQxJHMHJLLO4mJd?= =?us-ascii?Q?nN/b/HJM76gTA2qGW+ZypmfOfYTriqnpx/VWaIWWewRuPe5zMyA3Ah+/HS+u?= =?us-ascii?Q?b+ONcbkvm/CEVwYKoXJ/6hhhoTfhIsEv824zL6RI9EtaKMNma0Hb7aQd7H6U?= =?us-ascii?Q?H+JsOTCz5A+LWH2gB4XxggC/TUl0qm69kvC8tpfbkoacNmFGOBbWJCMGaBYX?= =?us-ascii?Q?ejy4ol/a6UVYKiwoADdwuwpG+remuWxRpjaXSDPdnRcW7XT8M2X/X13jXzYh?= =?us-ascii?Q?lPrm9qqKzu9XRe2Y1J3h+bVxybgqgz/OltXz4eFNXP3ZZRvgbnPEIZPX9cuC?= =?us-ascii?Q?wUoGR1RmcP+16KDe8cEQes7J57cXOx7aKWg8skTfECULgoqgh6gaJcx3G18n?= =?us-ascii?Q?sH6lbQET8iSDwrxfZpwaD4BPC+Eiw6ij5AgnYVC8Sqgaj5NENT/iwkxzPJi5?= =?us-ascii?Q?3C4PRrtttWDKOStfA5pl4ub2Dgl+AqwPkEIo/iPlEbhLByvoXXQFuODXDgzQ?= =?us-ascii?Q?cDXIrs9nqXdtQgsA/sy6yNcjJVkmHYg8OK3uE0mJ6eGeg5G7eG3Aq7BoErF6?= =?us-ascii?Q?Je4uxfaDeUG3jQzMbIMZ5NRNII2L1baPHSQoBVYUhZY9CnwaUsjLPcVKdd6T?= =?us-ascii?Q?AuGDHwLPXF25lO/+KahET2fx/ILdWo4mUy9T/5cnCHcwPg05RLQQLmZWwbxA?= =?us-ascii?Q?SmDhY/hsVMkbJYLK7u+IohcQsInULgTFwWRQjkRxYwYkCpT4g06pe6SJg3Uf?= =?us-ascii?Q?gSsASgAvWf214duvamc306N7fkh7tTC8qS5lzI7OFQKDZ/QSDOW7H8vXQIy9?= =?us-ascii?Q?SPm0ZgKWLS8RG6JLdFoO0kd8Al8slM6sEnysa0eJrCuFzLCcQ0lD+GwpmZ+L?= =?us-ascii?Q?UJb8GA/ilzDYr7mJwMLCbGzi9mgAgJxkHP5asln0dPTijcJHP7x6M7whRlO/?= =?us-ascii?Q?bfcE1NsQR1JdT9cGOGIJguUvnVIpTuvO6bks5Sc3V5o7NM6XcmuK+2yC9pdd?= =?us-ascii?Q?4+/9V7Xw2Vh2VkT7ncVnrFs6EcOfDzQlvJtCKsJT5lUK2ghYnfduZ7e+EMVm?= =?us-ascii?Q?xladYlJWSuQmFvSdnaqjzYkU7mj/3+1UQSsipXrhvL9GDKaGOVgfm5iWib/X?= =?us-ascii?Q?YEyL90xscQQq1mhTUBGH6PZZGnW/1vnTRhZswJgY4OQq3NeckFUnOdKE/Lh0?= =?us-ascii?Q?muFsXSe2lWg9t1R/pOLITUcAP28PdvrtEb5Ew6wy?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 85e928ef-9438-472a-9186-08db2ef26d4d X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Mar 2023 18:38:15.5680 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fJqHL6SWwlb0/4/rNnt8sXzT5oEZq97HOd1Y6ojvmBTKcMzmojXxJHQdDFL6j8V7 X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6650 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Logically the HWPT should have the coherency set properly for the device that it is being created for when it is created. This was happening implicitly if the immediate_attach was set because iommufd_hw_pagetable_attach() does it as the first thing. Do it unconditionally so !immediate_attach works properly. Reviewed-by: Kevin Tian Reviewed-by: Lu Baolu Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommufd/device.c | 19 ++++------------- drivers/iommu/iommufd/hw_pagetable.c | 27 +++++++++++++++++++++++++ drivers/iommu/iommufd/iommufd_private.h | 1 + 3 files changed, 32 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index a77acaf8309167..7008cea5158166 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -295,22 +295,11 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, goto err_unlock; } - /* - * Try to upgrade the domain we have, it is an iommu driver bug to - * report IOMMU_CAP_ENFORCE_CACHE_COHERENCY but fail - * enforce_cache_coherency when there are no devices attached to the - * domain. - */ - if (idev->enforce_cache_coherency && !hwpt->enforce_cache_coherency) { - if (hwpt->domain->ops->enforce_cache_coherency) - hwpt->enforce_cache_coherency = - hwpt->domain->ops->enforce_cache_coherency( - hwpt->domain); - if (!hwpt->enforce_cache_coherency) { - WARN_ON(list_empty(&idev->igroup->device_list)); - rc = -EINVAL; + /* Try to upgrade the domain we have */ + if (idev->enforce_cache_coherency) { + rc = iommufd_hw_pagetable_enforce_cc(hwpt); + if (rc) goto err_unlock; - } } rc = iopt_table_enforce_dev_resv_regions(&hwpt->ioas->iopt, idev->dev, diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index a538ceb13a6f22..c5c0ef9912a13e 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -25,6 +25,20 @@ void iommufd_hw_pagetable_destroy(struct iommufd_object *obj) refcount_dec(&hwpt->ioas->obj.users); } +int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt) +{ + if (hwpt->enforce_cache_coherency) + return 0; + + if (hwpt->domain->ops->enforce_cache_coherency) + hwpt->enforce_cache_coherency = + hwpt->domain->ops->enforce_cache_coherency( + hwpt->domain); + if (!hwpt->enforce_cache_coherency) + return -EINVAL; + return 0; +} + /** * iommufd_hw_pagetable_alloc() - Get an iommu_domain for a device * @ictx: iommufd context @@ -60,6 +74,19 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, goto out_abort; } + /* + * Set the coherency mode before we do iopt_table_add_domain() as some + * iommus have a per-PTE bit that controls it and need to decide before + * doing any maps. It is an iommu driver bug to report + * IOMMU_CAP_ENFORCE_CACHE_COHERENCY but fail enforce_cache_coherency on + * a new domain. + */ + if (idev->enforce_cache_coherency) { + rc = iommufd_hw_pagetable_enforce_cc(hwpt); + if (WARN_ON(rc)) + goto out_abort; + } + /* * immediate_attach exists only to accommodate iommu drivers that cannot * directly allocate a domain. These drivers do not finish creating the diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 8bf053f4d4a9ce..471a3fdff1e0b6 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -254,6 +254,7 @@ struct iommufd_hw_pagetable { struct iommufd_hw_pagetable * iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, struct iommufd_device *idev, bool immediate_attach); +int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt); int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev); struct iommufd_hw_pagetable * -- 2.40.0