kernel/linux.git/tools/testing/selftests/resctrl/resctrl_tests.c, branch v6.1.168

selftests/resctrl: Ensure the benchmark commands fits to its array

2023-11-20T10:52:03+00:00

[ Upstream commit 4a28c7665c2a1ac0400864eabb0c641e135f61aa ] Benchmark command is copied into an array in the stack. The array is BENCHMARK_ARGS items long but the command line could try to provide a longer command. Argument size is also fixed by BENCHMARK_ARG_SIZE (63 bytes of space after fitting the terminating \0 character) and user could have inputted argument longer than that. Return error in case the benchmark command does not fit to the space allocated for it. Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Signed-off-by: Ilpo Järvinen Tested-by: Shaopeng Tan Reviewed-by: Shaopeng Tan Reviewed-by: "Wieczor-Retman, Maciej" Reviewed-by: Reinette Chatre Signed-off-by: Shuah Khan Signed-off-by: Sasha Levin

selftests/resctrl: Fix resctrl_tests' return code to work with selftest framework

2022-04-25T23:10:21+00:00

In kselftest framework, if a sub test can not run by some reasons, the test result should be marked as SKIP rather than FAIL. Return KSFT_SKIP(4) instead of KSFT_FAIL(1) if resctrl_tests is not run as root or it is run on a test environment which does not support resctrl. - ksft_exit_fail_msg(): returns KSFT_FAIL(1) - ksft_exit_skip(): returns KSFT_SKIP(4) Reviewed-by: Shuah Khan Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu Signed-off-by: Shaopeng Tan Signed-off-by: Shuah Khan

selftests/resctrl: Print a message if the result of MBM&CMT tests is failed on Intel CPU

2022-04-25T22:58:01+00:00

According to "Intel Resource Director Technology (Intel RDT) on 2nd Generation Intel Xeon Scalable Processors Reference Manual", When the Intel Sub-NUMA Clustering(SNC) feature is enabled, Intel CMT and MBM counters may not be accurate. However, there does not seem to be an architectural way to detect if SNC is enabled. If the result of MBM&CMT test fails on Intel CPU, print a message to let users know a possible cause of failure. Acked-by: Reinette Chatre Signed-off-by: Shaopeng Tan Reviewed-by: Shuah Khan Signed-off-by: Shuah Khan

selftests/resctrl: Extend CPU vendor detection

2022-04-25T22:57:50+00:00

Currently, the resctrl_tests only has a function to detect AMD vendor. Since when the Intel Sub-NUMA Clustering feature is enabled, Intel CMT and MBM counters may not be accurate, the resctrl_tests also need a function to detect Intel vendor. And in the future, resctrl_tests will need a function to detect different vendors, such as Arm. Extend the function to detect Intel vendor as well. Also, this function can be easily extended to detect other vendors. Signed-off-by: Shaopeng Tan Reviewed-by: Reinette Chatre Reviewed-by: Shuah Khan Signed-off-by: Shuah Khan

selftests/resctrl: Fix incorrect parsing of option "-t"

2021-06-08T00:38:58+00:00

Resctrl test suite accepts command line argument "-t" to specify the unit tests to run in the test list (e.g., -t mbm,mba,cmt,cat) as documented in the help. When calling strtok() to parse the option, the incorrect delimiters argument ":\t" is used. As a result, passing "-t mbm,mba,cmt,cat" throws an invalid option error. Fix this by using delimiters argument "," instead of ":\t" for parsing of unit tests list. At the same time, remove the unnecessary "spaces" between the unit tests in help documentation to prevent confusion. Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest") Fixes: 78941183d1b1 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Fixes: 034c7678dd2c ("selftests/resctrl: Add README for resctrl tests") Cc: stable@vger.kernel.org Signed-off-by: Xiaochen Shen Reviewed-by: Tony Luck Signed-off-by: Shuah Khan

selftests/resctrl: Fix unmount resctrl FS

2021-04-02T19:58:26+00:00

umount_resctrlfs() directly attempts to unmount resctrl file system without checking if resctrl FS is already mounted or not. It returns 0 on success and on failure it prints an error message and returns an error status. Calling umount_resctrlfs() when resctrl FS isn't mounted will return an error status. There could be situations where-in the caller might not know if resctrl FS is already mounted or not and the caller might still want to unmount resctrl FS if it's already mounted (For example during teardown). To support above use cases, change umount_resctrlfs() such that it now first checks if resctrl FS is already mounted or not and unmounts resctrl FS only if it's already mounted. unmount resctrl FS upon exit. For example, running only mba test on a Broadwell (BDW) machine (MBA isn't supported on BDW CPU). This happens because validate_resctrl_feature_request() would mount resctrl FS to check if mba is enabled on the platform or not and finds that the H/W doesn't support mba and hence will return false to run_mba_test(). This in turn makes the main() function return without unmounting resctrl FS. Tested-by: Babu Moger Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan

selftests/resctrl: Skip the test if requested resctrl feature is not supported

2021-04-02T19:58:20+00:00

There could be two reasons why a resctrl feature might not be enabled on the platform 1. H/W might not support the feature 2. Even if the H/W supports it, the user might have disabled the feature through kernel command line arguments Hence, any resctrl unit test (like cmt, cat, mbm and mba) before starting the test will first check if the feature is enabled on the platform or not. If the feature isn't enabled, then the test returns with an error status. For example, if MBA isn't supported on a platform and if the user tries to run MBA, the output will look like this ok mounting resctrl to "/sys/fs/resctrl" not ok MBA: schemata change But, not supporting a feature isn't a test failure. So, instead of treating it as an error, use the SKIP directive of the TAP protocol. With the change, the output will look as below ok MBA # SKIP Hardware does not support MBA or MBA is disabled Suggested-by: Reinette Chatre Tested-by: Babu Moger Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan

selftests/resctrl: Modularize resctrl test suite main() function

2021-04-02T19:58:14+00:00

Resctrl test suite main() function does the following things 1. Parses command line arguments passed by user 2. Some setup checks 3. Logic that calls into each unit test 4. Print result and clean up after running each unit test Introduce wrapper functions for steps 3 and 4 to modularize the main() function. Adding these wrapper functions makes it easier to add any logic to each individual test. Please note that this is a preparatory patch for the next one and no functional changes are intended. Suggested-by: Reinette Chatre Tested-by: Babu Moger Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan

selftests/resctrl: Don't hard code value of "no_of_bits" variable

2021-04-02T19:58:08+00:00

Cache related tests (like CAT and CMT) depend on a variable called no_of_bits to run. no_of_bits defines the number of contiguous bits that should be set in the CBM mask and a user can pass a value for no_of_bits using -n command line argument. If a user hasn't passed any value, it defaults to 5 (randomly chosen value). Hard coding no_of_bits to 5 will make the cache tests fail to run on systems that support maximum cbm mask that is less than or equal to 5 bits. Hence, don't hard code no_of_bits value. If a user passes a value for "no_of_bits" using -n option, use it. Otherwise, no_of_bits is equal to half of the maximum number of bits in the cbm mask. Please note that CMT test is still hard coded to 5 bits. It will change in subsequent patches that change CMT test. Tested-by: Babu Moger Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan

selftests/resctrl: Fix a printed message

2021-04-02T19:54:20+00:00

Add a missing newline to the printed help text to improve readability. Tested-by: Babu Moger Signed-off-by: Reinette Chatre Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan