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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Feb 2025 01:31:41.0405 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 43acd05d-8768-4fed-fe73-08dd5797a719 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CEB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYXPR12MB9441 Content-Type: text/plain; charset="utf-8" Steal two bits from the 32-bit "type" in struct iommu_domain to store a new tag for private data owned by either dma-iommu or iommufd. Set the domain->private_data_owner in dma-iommu and iommufd. These will be used to replace the sw_msi function pointer. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- include/linux/iommu.h | 7 ++++++- drivers/iommu/dma-iommu.c | 2 ++ drivers/iommu/iommufd/hw_pagetable.c | 3 +++ 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index e93d2e918599..4f2774c08262 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -209,8 +209,13 @@ struct iommu_domain_geometry { #define IOMMU_DOMAIN_PLATFORM (__IOMMU_DOMAIN_PLATFORM) #define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED) =20 +#define IOMMU_DOMAIN_DATA_OWNER_NONE (0U) +#define IOMMU_DOMAIN_DATA_OWNER_DMA (1U) +#define IOMMU_DOMAIN_DATA_OWNER_IOMMUFD (2U) + struct iommu_domain { - unsigned type; + u32 type : 30; + u32 private_data_owner : 2; const struct iommu_domain_ops *ops; const struct iommu_dirty_ops *dirty_ops; const struct iommu_ops *owner; /* Whose domain_alloc we came from */ diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 94263ed2c564..78915d74e8fa 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -403,6 +403,7 @@ int iommu_get_dma_cookie(struct iommu_domain *domain) =20 mutex_init(&domain->iova_cookie->mutex); iommu_domain_set_sw_msi(domain, iommu_dma_sw_msi); + domain->private_data_owner =3D IOMMU_DOMAIN_DATA_OWNER_DMA; return 0; } =20 @@ -435,6 +436,7 @@ int iommu_get_msi_cookie(struct iommu_domain *domain, d= ma_addr_t base) cookie->msi_iova =3D base; domain->iova_cookie =3D cookie; iommu_domain_set_sw_msi(domain, iommu_dma_sw_msi); + domain->private_data_owner =3D IOMMU_DOMAIN_DATA_OWNER_DMA; return 0; } EXPORT_SYMBOL(iommu_get_msi_cookie); diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/h= w_pagetable.c index 7de6e914232e..5640444de475 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -157,6 +157,7 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, str= uct iommufd_ioas *ioas, } } iommu_domain_set_sw_msi(hwpt->domain, iommufd_sw_msi); + hwpt->domain->private_data_owner =3D IOMMU_DOMAIN_DATA_OWNER_IOMMUFD; =20 /* * Set the coherency mode before we do iopt_table_add_domain() as some @@ -253,6 +254,7 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx, } hwpt->domain->owner =3D ops; iommu_domain_set_sw_msi(hwpt->domain, iommufd_sw_msi); + hwpt->domain->private_data_owner =3D IOMMU_DOMAIN_DATA_OWNER_IOMMUFD; =20 if (WARN_ON_ONCE(hwpt->domain->type !=3D IOMMU_DOMAIN_NESTED)) { rc =3D -EINVAL; @@ -310,6 +312,7 @@ iommufd_viommu_alloc_hwpt_nested(struct iommufd_viommu = *viommu, u32 flags, } hwpt->domain->owner =3D viommu->iommu_dev->ops; iommu_domain_set_sw_msi(hwpt->domain, iommufd_sw_msi); + hwpt->domain->private_data_owner =3D IOMMU_DOMAIN_DATA_OWNER_IOMMUFD; =20 if (WARN_ON_ONCE(hwpt->domain->type !=3D IOMMU_DOMAIN_NESTED)) { rc =3D -EINVAL; --=20 2.43.0