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Thu, 23 Mar 2023 01:33:24 -0700 From: Nicolin Chen To: , , , , , , CC: , , , , , , Subject: [PATCH v5 2/4] iommufd: Add iommufd_access_replace() API Date: Thu, 23 Mar 2023 01:33:03 -0700 Message-ID: <2c3fa7a21373ee10af7cc9f8c370945a08341930.1679559476.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF000108E9:EE_|PH0PR12MB7908:EE_ X-MS-Office365-Filtering-Correlation-Id: 6ca4b91d-4cc0-4782-7157-08db2b794ddd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: lMkGEi7ut4fo4tUukxjqjxWH4q1oWnCKVixJ1kxDT8yvlXKeaCyAXVxjtPl2lBYn6BkMzt6wjdRTZ4TdevD5xkQKsUf301SsO3BPK06yP3Eoi/TndWjAYujLSe0IAEFKOIN2VrMdjEla1wjoaHlPBcHiTDiwTELQKVuK5Wtq16Dx10JnkpQx5BRM2aJEFfCuGKt3MP1jwS00UmKf1fKDt0VdgvlkVf39HvbWuYELleKQP7PADG+63jA5RIdEkkk3DR1a1NBUtgsdyrECPPxu+o4ksqyM6sYpbbejm+7i++hqXxB1FpR0edDXEhzbw39PEDXqnDvWAxNlAGaHeRGK4nQjm5ORIj4ulSmxjoAZJmpHz4UY15HDpHKcfE/111vM/6XAP+/fijHxpDw93otqNbA9T7rDCkxadN6idVBi5N7acVjTDGKXkk4SCAfnl9eutqXkTmdJNNJbrCTE9BnjR7LJdc7LYhx4w66zNw1RFSJFuw87vcmR+6w4FbbGG/7qDy23rOw2hGf2ruLmSTgPUEKGM36XdnLdfeY9kys6yjmx1sW/fpbXFWpGu+ckAr/PyWKWCsxDUKxvCVZ/clIAw4EZymy8ueNcTAtgd8ojI1ci82lfWdG5CxlVGhBguFPgMd5RnBrl5Bh5f8d/N1i+e+9zRPwflXioFHpTZhomcDFwkhCTuwm04s+VV+9iOIefNNp0SGHjvcSpChjLDpe3JORzsuk8QJOSt7OoOU3C3XilBoHce7fhwAWPs6ODmeRe X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(136003)(396003)(39860400002)(346002)(376002)(451199018)(46966006)(36840700001)(40470700004)(47076005)(426003)(186003)(6666004)(7696005)(336012)(478600001)(26005)(83380400001)(8676002)(2616005)(110136005)(316002)(70586007)(70206006)(54906003)(7636003)(8936002)(5660300002)(40480700001)(41300700001)(7416002)(82740400003)(36860700001)(4326008)(2906002)(40460700003)(356005)(86362001)(36756003)(82310400005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2023 08:33:39.7640 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6ca4b91d-4cc0-4782-7157-08db2b794ddd 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: BL02EPF000108E9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7908 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Extract all common procedure, between the iommufd_access_attach() API and the new iommufd_access_replace() API, to an iommufd_access_change_pt() helper. Add iommufd_access_replace() function for VFIO emulated pathway to use. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 60 ++++++++++++++++++++----- include/linux/iommufd.h | 1 + tools/testing/selftests/iommu/iommfd*.c | 0 3 files changed, 50 insertions(+), 11 deletions(-) create mode 100644 tools/testing/selftests/iommu/iommfd*.c diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 012e85fc6d77..3b39b76fbc3b 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -746,39 +746,77 @@ void iommufd_access_detach(struct iommufd_access *access) } EXPORT_SYMBOL_NS_GPL(iommufd_access_detach, IOMMUFD); -int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) +static struct iommufd_ioas * +iommufd_access_change_pt(struct iommufd_access *access, u32 ioas_id) { struct iommufd_ioas *new_ioas; struct iommufd_object *obj; int rc = 0; + lockdep_assert_held(&access->ioas_lock); + + obj = iommufd_get_object(access->ictx, ioas_id, IOMMUFD_OBJ_IOAS); + if (IS_ERR(obj)) + return (struct iommufd_ioas *)obj; + new_ioas = container_of(obj, struct iommufd_ioas, obj); + + rc = iopt_add_access(&new_ioas->iopt, access); + if (rc) { + iommufd_put_object(obj); + return ERR_PTR(rc); + } + iommufd_ref_to_users(obj); + return new_ioas; +} + +int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) +{ + struct iommufd_ioas *new_ioas; + mutex_lock(&access->ioas_lock); if (access->ioas != NULL && access->ioas->obj.id != ioas_id) { mutex_unlock(&access->ioas_lock); return -EINVAL; } - obj = iommufd_get_object(access->ictx, ioas_id, IOMMUFD_OBJ_IOAS); - if (IS_ERR(obj)) { + new_ioas = iommufd_access_change_pt(access, ioas_id); + if (IS_ERR(new_ioas)) { mutex_unlock(&access->ioas_lock); - return PTR_ERR(obj); + return PTR_ERR(new_ioas); } - new_ioas = container_of(obj, struct iommufd_ioas, obj); + access->ioas = new_ioas; + access->ioas_unpin = new_ioas; + mutex_unlock(&access->ioas_lock); + return 0; +} +EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); - rc = iopt_add_access(&new_ioas->iopt, access); - if (rc) { +int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id) +{ + struct iommufd_ioas *new_ioas; + + mutex_lock(&access->ioas_lock); + if (!access->ioas) { mutex_unlock(&access->ioas_lock); - iommufd_put_object(obj); - return rc; + return -ENOENT; + } + if (access->ioas->obj.id == ioas_id) { + mutex_unlock(&access->ioas_lock); + return 0; } - iommufd_ref_to_users(obj); + new_ioas = iommufd_access_change_pt(access, ioas_id); + if (IS_ERR(new_ioas)) { + mutex_unlock(&access->ioas_lock); + return PTR_ERR(new_ioas); + } + __iommufd_access_detach(access); access->ioas = new_ioas; access->ioas_unpin = new_ioas; mutex_unlock(&access->ioas_lock); return 0; } -EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); +EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD); /** * iommufd_access_notify_unmap - Notify users of an iopt to stop using it diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 7c79f9b33246..cd7ae5a625fc 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -46,6 +46,7 @@ iommufd_access_create(struct iommufd_ctx *ictx, const struct iommufd_access_ops *ops, void *data, u32 *id); void iommufd_access_destroy(struct iommufd_access *access); int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id); +int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id); void iommufd_access_detach(struct iommufd_access *access); void iommufd_ctx_get(struct iommufd_ctx *ictx); diff --git a/tools/testing/selftests/iommu/iommfd*.c b/tools/testing/selftests/iommu/iommfd*.c new file mode 100644 index 000000000000..e69de29bb2d1 -- 2.40.0