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Tue, 6 Jun 2023 00:17:12 -0700 Received: from rnnvmail201.nvidia.com (10.129.68.8) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.37; Tue, 6 Jun 2023 00:17:11 -0700 Received: from sandstorm.nvidia.com (10.127.8.14) by mail.nvidia.com (10.129.68.8) with Microsoft SMTP Server id 15.2.986.37 via Frontend Transport; Tue, 6 Jun 2023 00:17:11 -0700 From: John Hubbard To: Andrew Morton CC: David Hildenbrand , Peter Xu , "Shuah Khan" , Nathan Chancellor , , , LKML , John Hubbard Subject: [PATCH v3 09/11] selftests/mm: move certain uffd*() routines from vm_util.c to uffd-common.c Date: Tue, 6 Jun 2023 00:16:35 -0700 Message-ID: <20230606071637.267103-10-jhubbard@nvidia.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230606071637.267103-1-jhubbard@nvidia.com> References: <20230606071637.267103-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF000145BB:EE_|SA1PR12MB6896:EE_ X-MS-Office365-Filtering-Correlation-Id: d6cc912f-6d42-4481-133b-08db665e13fa X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2023 07:17:24.9140 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d6cc912f-6d42-4481-133b-08db665e13fa 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: BL02EPF000145BB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6896 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org There are only three uffd*() routines that are used outside of the uffd selftests. Leave these in vm_util.c, where they are available to any mm selftest program: uffd_register() uffd_unregister() uffd_register_with_ioctls(). A few other uffd*() routines, however, are only used by the uffd-focused tests found in uffd-stress.c and uffd-unit-tests.c. Move those routines into uffd-common.c. Cc: Peter Xu Acked-by: David Hildenbrand Signed-off-by: John Hubbard Tested-by: Muhammad Usama Anjum --- tools/testing/selftests/mm/uffd-common.c | 59 ++++++++++++++++++++++++ tools/testing/selftests/mm/uffd-common.h | 5 ++ tools/testing/selftests/mm/vm_util.c | 59 ------------------------ tools/testing/selftests/mm/vm_util.h | 4 -- 4 files changed, 64 insertions(+), 63 deletions(-) diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c index 61c6250adf93..ba20d7504022 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -616,3 +616,62 @@ int copy_page(int ufd, unsigned long offset, bool wp) { return __copy_page(ufd, offset, false, wp); } + +int uffd_open_dev(unsigned int flags) +{ + int fd, uffd; + + fd = open("/dev/userfaultfd", O_RDWR | O_CLOEXEC); + if (fd < 0) + return fd; + uffd = ioctl(fd, USERFAULTFD_IOC_NEW, flags); + close(fd); + + return uffd; +} + +int uffd_open_sys(unsigned int flags) +{ +#ifdef __NR_userfaultfd + return syscall(__NR_userfaultfd, flags); +#else + return -1; +#endif +} + +int uffd_open(unsigned int flags) +{ + int uffd = uffd_open_sys(flags); + + if (uffd < 0) + uffd = uffd_open_dev(flags); + + return uffd; +} + +int uffd_get_features(uint64_t *features) +{ + struct uffdio_api uffdio_api = { .api = UFFD_API, .features = 0 }; + /* + * This should by default work in most kernels; the feature list + * will be the same no matter what we pass in here. + */ + int fd = uffd_open(UFFD_USER_MODE_ONLY); + + if (fd < 0) + /* Maybe the kernel is older than user-only mode? */ + fd = uffd_open(0); + + if (fd < 0) + return fd; + + if (ioctl(fd, UFFDIO_API, &uffdio_api)) { + close(fd); + return -errno; + } + + *features = uffdio_api.features; + close(fd); + + return 0; +} diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h index 6068f2346b86..197f5262fe0d 100644 --- a/tools/testing/selftests/mm/uffd-common.h +++ b/tools/testing/selftests/mm/uffd-common.h @@ -110,6 +110,11 @@ int __copy_page(int ufd, unsigned long offset, bool retry, bool wp); int copy_page(int ufd, unsigned long offset, bool wp); void *uffd_poll_thread(void *arg); +int uffd_open_dev(unsigned int flags); +int uffd_open_sys(unsigned int flags); +int uffd_open(unsigned int flags); +int uffd_get_features(uint64_t *features); + #define TEST_ANON 1 #define TEST_HUGETLB 2 #define TEST_SHMEM 3 diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 9b06a5034808..681277615839 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -242,62 +242,3 @@ int uffd_unregister(int uffd, void *addr, uint64_t len) return ret; } - -int uffd_open_dev(unsigned int flags) -{ - int fd, uffd; - - fd = open("/dev/userfaultfd", O_RDWR | O_CLOEXEC); - if (fd < 0) - return fd; - uffd = ioctl(fd, USERFAULTFD_IOC_NEW, flags); - close(fd); - - return uffd; -} - -int uffd_open_sys(unsigned int flags) -{ -#ifdef __NR_userfaultfd - return syscall(__NR_userfaultfd, flags); -#else - return -1; -#endif -} - -int uffd_open(unsigned int flags) -{ - int uffd = uffd_open_sys(flags); - - if (uffd < 0) - uffd = uffd_open_dev(flags); - - return uffd; -} - -int uffd_get_features(uint64_t *features) -{ - struct uffdio_api uffdio_api = { .api = UFFD_API, .features = 0 }; - /* - * This should by default work in most kernels; the feature list - * will be the same no matter what we pass in here. - */ - int fd = uffd_open(UFFD_USER_MODE_ONLY); - - if (fd < 0) - /* Maybe the kernel is older than user-only mode? */ - fd = uffd_open(0); - - if (fd < 0) - return fd; - - if (ioctl(fd, UFFDIO_API, &uffdio_api)) { - close(fd); - return -errno; - } - - *features = uffdio_api.features; - close(fd); - - return 0; -} diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 07f39ed2efba..c2d4ff798b91 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -48,10 +48,6 @@ unsigned long default_huge_page_size(void); int uffd_register(int uffd, void *addr, uint64_t len, bool miss, bool wp, bool minor); int uffd_unregister(int uffd, void *addr, uint64_t len); -int uffd_open_dev(unsigned int flags); -int uffd_open_sys(unsigned int flags); -int uffd_open(unsigned int flags); -int uffd_get_features(uint64_t *features); int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len, bool miss, bool wp, bool minor, uint64_t *ioctls);