Re: [PATCH 3/4] selftests/resctrl: Add support for MBM and MBA tests on AMD

Ilpo Järvinen
2024-02-23T10:54:15Z

On Thu, 22 Feb 2024, Babu Moger wrote:

> Add support to read UMC (Unified Memory Controller) perf events to compare
> the numbers with QoS monitor for AMD.
>
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
> .../testing/selftests/resctrl/resctrl_tests.c | 6 +-
> tools/testing/selftests/resctrl/resctrl_val.c | 62 +++++++++++++++++--
> 2 files changed, 58 insertions(+), 10 deletions(-)
>
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index 2bbe3045a018..231233b8d354 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -104,8 +104,7 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
> }
>
> if (!validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") ||
> - !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
> - (get_vendor() != ARCH_INTEL)) {
> + !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes")) {
> ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n");
> goto cleanup;
> }
> @@ -131,8 +130,7 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
> }
>
> if (!validate_resctrl_feature_request("MB", NULL) ||
> - !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
> - (get_vendor() != ARCH_INTEL)) {
> + !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes")) {
> ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n");
> goto cleanup;
> }

These need to be rebased as this code moved into per test files with the
generic test framework. The .vendor_specific field is the new way to make
tests limited to particular vendors.

> diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
> index 792116d3565f..c5a4607aa9d9 100644
> --- a/tools/testing/selftests/resctrl/resctrl_val.c
> +++ b/tools/testing/selftests/resctrl/resctrl_val.c
> @@ -11,6 +11,7 @@
> #include "resctrl.h"
>
> #define UNCORE_IMC "uncore_imc"
> +#define AMD_UMC "amd_umc"
> #define READ_FILE_NAME "events/cas_count_read"
> #define WRITE_FILE_NAME "events/cas_count_write"
> #define DYN_PMU_PATH "/sys/bus/event_source/devices"
> @@ -146,6 +147,47 @@ static int open_perf_event(int i, int cpu_no, int j)
> return 0;
> }
>
> +/* Get type and config (read and write) of an UMC counter */
> +static int read_from_umc_dir(char *umc_dir, int count)
> +{
> + char umc_counter_type[1024];

PATH_MAX

> + FILE *fp;
> +
> + /* Get type of iMC counter */
> + sprintf(umc_counter_type, "%s%s", umc_dir, "type");
> + fp = fopen(umc_counter_type, "r");
> + if (!fp) {
> + perror("Failed to open imc counter type file");

Please don't add new perror() anymore, I just managed to clean up those
in favor of ksft_perror().

> +

Drop this newline (to slowly move towards more concise error handling
blocks w/o all those extra newlines).

> + return -1;

> + }
> + if (fscanf(fp, "%u", &imc_counters_config[count][READ].type) <= 0) {
> + perror("Could not get imc type");

Ditto.

> + fclose(fp);
> + return -1;
> + }
> +
> + fclose(fp);
> +
> + imc_counters_config[count][WRITE].type =
> + imc_counters_config[count][READ].type;
> +
> + /*
> + * Setup the event and umasks for UMC events
> + * Number of CAS commands sent for reads:
> + * EventCode = 0x0a, umask = 0x1
> + * Number of CAS commands sent for writes:
> + * EventCode = 0x0a, umask = 0x2
> + */
> + imc_counters_config[count][READ].event = 0xa;
> + imc_counters_config[count][READ].umask = 0x1;
> +
> + imc_counters_config[count][WRITE].event = 0xa;
> + imc_counters_config[count][WRITE].umask = 0x2;
> +
> + return 0;
> +}
> +
> /* Get type and config (read and write) of an iMC counter */
> static int read_from_imc_dir(char *imc_dir, int count)
> {

--
i.