linux-stable.git/tools/testing/selftests/resctrl, branch linux-6.4.y

selftests/resctrl: Close perf value read fd on errors

2023-09-13T07:47:58+00:00

[ Upstream commit 51a0c3b7f028169e40db930575dd01fe81c3e765 ]

Perf event fd (fd_lm) is not closed when run_fill_buf() returns error.

Close fd_lm only in cat_val() to make it easier to track it is always
closed.

Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest")
Signed-off-by: Ilpo Järvinen 
Tested-by: Babu Moger 
Tested-by: Shaopeng Tan (Fujitsu) 
Signed-off-by: Shuah Khan 
Signed-off-by: Sasha Levin

selftests/resctrl: Unmount resctrl FS if child fails to run benchmark

2023-09-13T07:47:58+00:00

[ Upstream commit f99e413eb54652e2436cc56d081176bc9a34cd8d ]

A child calls PARENT_EXIT() when it fails to run a benchmark to kill
the parent process. PARENT_EXIT() lacks unmount for the resctrl FS and
the parent won't be there to unmount it either after it gets killed.

Add the resctrl FS unmount also to PARENT_EXIT().

Fixes: 591a6e8588fc ("selftests/resctrl: Add basic resctrl file system operations and data")
Signed-off-by: Ilpo Järvinen 
Reviewed-by: Reinette Chatre 
Tested-by: Babu Moger 
Tested-by: Shaopeng Tan (Fujitsu) 
Signed-off-by: Shuah Khan 
Signed-off-by: Sasha Levin

selftests/resctrl: Don't leak buffer in fill_cache()

2023-09-13T07:47:58+00:00

[ Upstream commit 2d320b1029ee7329ee0638181be967789775b962 ]

The error path in fill_cache() does return before the allocated buffer
is freed leaking the buffer.

The leak was introduced when fill_cache_read() started to return errors
in commit c7b607fa9325 ("selftests/resctrl: Fix null pointer
dereference on open failed"), before that both fill functions always
returned 0.

Move free() earlier to prevent the mem leak.

Fixes: c7b607fa9325 ("selftests/resctrl: Fix null pointer dereference on open failed")
Signed-off-by: Ilpo Järvinen 
Reviewed-by: Reinette Chatre 
Tested-by: Babu Moger 
Tested-by: Shaopeng Tan (Fujitsu) 
Signed-off-by: Shuah Khan 
Signed-off-by: Sasha Levin

selftests/resctrl: Add resctrl.h into build deps

2023-09-13T07:47:58+00:00

[ Upstream commit 8e289f4542890168705219e54f0231dccfabddbe ]

Makefile only lists *.c as build dependencies for the resctrl_tests
executable which excludes resctrl.h.

Add *.h to wildcard() to include resctrl.h.

Fixes: 591a6e8588fc ("selftests/resctrl: Add basic resctrl file system operations and data")
Signed-off-by: Ilpo Järvinen 
Reviewed-by: Reinette Chatre 
Tested-by: Babu Moger 
Tested-by: Shaopeng Tan (Fujitsu) 
Signed-off-by: Shuah Khan 
Signed-off-by: Sasha Levin

selftests/resctrl: Fix incorrect error return on test complete

2023-04-14T17:13:18+00:00

An error snuck in between two recent conflicting changes:
Until recently ->setup() used negative values to indicate
normal test termination. This was changed in
commit fa10366cc6f4 ("selftests/resctrl: Allow ->setup() to return
errors") that transitioned ->setup() to use negative values
to indicate errors and a new END_OF_TESTS to indicate normal
termination.

commit 42e3b093eb7c ("selftests/resctrl: Fix set up schemata with 100%
allocation on first run in MBM test") continued to use
negative return to indicate normal test termination.

Fix mbm_setup() to use the new END_OF_TESTS to indicate
error-free test termination.

Fixes: 42e3b093eb7c ("selftests/resctrl: Fix set up schemata with 100% allocation on first run in MBM test")
Reported-by: Ilpo Järvinen 
Link: https://lore.kernel.org/lkml/bb65cce8-54d7-68c5-ef19-3364ec95392a@linux.intel.com/
Signed-off-by: Reinette Chatre 
Signed-off-by: Shuah Khan

selftests/resctrl: Remove duplicate codes that clear each test result file

2023-04-13T17:34:29+00:00

Before exiting each test function(run_cmt/cat/mbm/mba_test()),
test results("ok","not ok") are printed by ksft_test_result() and then
temporary result files are cleaned by function
cmt/cat/mbm/mba_test_cleanup().
However, before running ksft_test_result(),
function cmt/cat/mbm/mba_test_cleanup()
has been run in each test function as follows:
  cmt_resctrl_val()
  cat_perf_miss_val()
  mba_schemata_change()
  mbm_bw_change()

Remove duplicate codes that clear each test result file,
while ensuring cleanup properly even when errors occur in each test.

Reviewed-by: Reinette Chatre 
Signed-off-by: Shaopeng Tan 
Signed-off-by: Shuah Khan

selftests/resctrl: Commonize the signal handler register/unregister for all tests

2023-04-13T17:34:23+00:00

After creating a child process with fork() in CAT test, if a signal such
as SIGINT is received, the parent process will be terminated immediately,
and therefore the child process will not be killed and also resctrlfs is
not unmounted.

There is a signal handler registered in CMT/MBM/MBA tests, which kills
child process, unmount resctrlfs, cleanups result files, etc., if a
signal such as SIGINT is received.

Commonize the signal handler registered for CMT/MBM/MBA tests and
reuse it in CAT.

To reuse the signal handler to kill child process use global bm_pid
instead of local bm_pid.

Also, since the MBA/MBA/CMT/CAT are run in order, unregister the signal
handler at the end of each test so that the signal handler cannot be
inherited by other tests.

Reviewed-by: Ilpo Jarvinen 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shaopeng Tan 
Signed-off-by: Shuah Khan

selftests/resctrl: Cleanup properly when an error occurs in CAT test

2023-04-13T17:34:17+00:00

After creating a child process with fork() in CAT test, if an error
occurs when parent process runs cat_val() or check_results(), the child
process will not be killed and also resctrlfs is not unmounted. Also if
an error occurs when child process runs cat_val() or check_results(),
the parent process will wait for the pipe message from the child process
which will never be sent by the child process and the parent process
cannot proceed to unmount resctrlfs.

Synchronize the exits between the parent and child. An error could
occur whether in parent process or child process. The parent process
always kills the child process and runs umount_resctrlfs(). The
child process always waits to be killed by the parent process.

Reviewed-by: Reinette Chatre 
Signed-off-by: Shaopeng Tan 
Signed-off-by: Shuah Khan

selftests/resctrl: Flush stdout file buffer before executing fork()

2023-04-13T17:34:12+00:00

When a process has buffered output, a child process created by fork()
will also copy buffered output. When using kselftest framework,
the output (resctrl test result message) will be printed multiple times.

Add fflush() to flush out the buffered output before executing fork().

Reviewed-by: Shuah Khan 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shaopeng Tan 
Signed-off-by: Shuah Khan

selftests/resctrl: Return MBA check result and make it to output message

2023-04-13T17:34:05+00:00

Since MBA check result is not returned, the MBA test result message
is always output as "ok" regardless of whether the MBA check result is
true or false.

Make output message to be "not ok" if MBA check result is failed.

Reviewed-by: Shuah Khan 
Reviewed-by: Reinette Chatre 
Signed-off-by: Shaopeng Tan 
Signed-off-by: Shuah Khan