CMT (Cache Monitoring Technology) [1] is a H/W feature that reports cache occupancy of a process. resctrl selftest suite has a unit test to test CMT for LLC but the test is named as CQM (Cache Quality Monitoring). Furthermore, the unit test source file is named as cqm_test.c and several functions, variables, comments, preprocessors and statements widely use "cqm" as either suffix or prefix. This rampant misusage of CQM for CMT might confuse someone who is newly looking at resctrl selftests because this feature is named CMT in the Intel Software Developer's Manual.

Hence, rename all the occurrences (unit test source file name, functions, variables, comments and preprocessors) of cqm with cmt.

[1] Please see Intel SDM, Volume 3, chapter 17 and section 18 for more information on CMT.

Fixes: 78941183d1b1 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Suggested-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/README | 4 +-- tools/testing/selftests/resctrl/cache.c | 4 +-- .../resctrl/{cqm_test.c => cmt_test.c} | 20 +++++++------- tools/testing/selftests/resctrl/resctrl.h | 4 +-- .../testing/selftests/resctrl/resctrl_tests.c | 26 +++++++++---------- tools/testing/selftests/resctrl/resctrl_val.c | 12 ++++----- tools/testing/selftests/resctrl/resctrlfs.c | 10 +++---- 7 files changed, 40 insertions(+), 40 deletions(-) rename tools/testing/selftests/resctrl/{cqm_test.c => cmt_test.c} (89%)

diff --git a/tools/testing/selftests/resctrl/README b/tools/testing/selftests/resctrl/README index 6e5a0ffa18e8..4b36b25b6ac0 100644 --- a/tools/testing/selftests/resctrl/README +++ b/tools/testing/selftests/resctrl/README @@ -46,8 +46,8 @@ ARGUMENTS Parameter '-h' shows usage information.

usage: resctrl_tests [-h] [-b "benchmark_cmd [options]"] [-t test list] [-n no_of_bits] - -b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CQM default benchmark is builtin fill_buf - -t test list: run tests specified in the test list, e.g. -t mbm, mba, cqm, cat + -b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT default benchmark is builtin fill_buf + -t test list: run tests specified in the test list, e.g. -t mbm, mba, cmt, cat -n no_of_bits: run cache tests using specified no of bits in cache bit mask -p cpu_no: specify CPU number to run the test. 1 is default -h: help diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c index 38dbf4962e33..4d73edd81293 100644 --- a/tools/testing/selftests/resctrl/cache.c +++ b/tools/testing/selftests/resctrl/cache.c @@ -111,7 +111,7 @@ static int get_llc_perf(unsigned long *llc_perf_miss)

/* * Get LLC Occupancy as reported by RESCTRL FS - * For CQM, + * For CMT, * 1. If con_mon grp and mon grp given, then read from mon grp in * con_mon grp * 2. If only con_mon grp given, then read from con_mon grp @@ -192,7 +192,7 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid) /* * Measure llc occupancy from resctrl. */ - if (!strcmp(param->resctrl_val, "cqm")) { + if (!strcmp(param->resctrl_val, "cmt")) { ret = get_llc_occu_resctrl(&llc_occu_resc); if (ret < 0) return ret; diff --git a/tools/testing/selftests/resctrl/cqm_test.c b/tools/testing/selftests/resctrl/cmt_test.c similarity index 89% rename from tools/testing/selftests/resctrl/cqm_test.c rename to tools/testing/selftests/resctrl/cmt_test.c index c8756152bd61..13b01e010238 100644 --- a/tools/testing/selftests/resctrl/cqm_test.c +++ b/tools/testing/selftests/resctrl/cmt_test.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Cache Monitoring Technology (CQM) test + * Cache Monitoring Technology (CMT) test * * Copyright (C) 2018 Intel Corporation * @@ -11,7 +11,7 @@ #include "resctrl.h" #include <unistd.h>

-#define RESULT_FILE_NAME "result_cqm" +#define RESULT_FILE_NAME "result_cmt" #define NUM_OF_RUNS 5 #define MAX_DIFF 2000000 #define MAX_DIFF_PERCENT 15 @@ -21,7 +21,7 @@ char cbm_mask[256]; unsigned long long_mask; unsigned long cache_size;

-static int cqm_setup(int num, ...) +static int cmt_setup(int num, ...) { struct resctrl_val_param *p; va_list param; @@ -58,7 +58,7 @@ static void show_cache_info(unsigned long sum_llc_occu_resc, int no_of_bits, else res = false;

- printf("%sok CQM: diff within %d, %d%%\n", res ? "" : "not", + printf("%sok CMT: diff within %d, %d%%\n", res ? "" : "not", MAX_DIFF, (int)MAX_DIFF_PERCENT);

printf("# diff: %ld\n", avg_diff); @@ -106,12 +106,12 @@ static int check_results(struct resctrl_val_param *param, int no_of_bits) return 0; }

-void cqm_test_cleanup(void) +void cmt_test_cleanup(void) { remove(RESULT_FILE_NAME); }

-int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd) +int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd) { int ret, mum_resctrlfs;

@@ -122,7 +122,7 @@ int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd) if (ret) return ret;

- if (!validate_resctrl_feature_request("cqm")) + if (!validate_resctrl_feature_request("cmt")) return -1;

ret = get_cbm_mask("L3"); @@ -145,7 +145,7 @@ int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd) }

struct resctrl_val_param param = { - .resctrl_val = "cqm", + .resctrl_val = "cmt", .ctrlgrp = "c1", .mongrp = "m1", .cpu_no = cpu_no, @@ -154,7 +154,7 @@ int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd) .mask = ~(long_mask << n) & long_mask, .span = cache_size * n / count_of_bits, .num_of_runs = 0, - .setup = cqm_setup, + .setup = cmt_setup, };

if (strcmp(benchmark_cmd[0], "fill_buf") == 0) @@ -170,7 +170,7 @@ int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd) if (ret) return ret;

- cqm_test_cleanup(); + cmt_test_cleanup();

return 0; } diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index 39bf59c6b9c5..68522b19b235 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -98,9 +98,9 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr); int cat_val(struct resctrl_val_param *param); void cat_test_cleanup(void); int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type); -int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd); +int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd); unsigned int count_bits(unsigned long n); -void cqm_test_cleanup(void); +void cmt_test_cleanup(void); int get_core_sibling(int cpu_no); int measure_cache_vals(struct resctrl_val_param *param, int bm_pid);

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index 425cc85ac883..35a91cab1b88 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -37,10 +37,10 @@ void detect_amd(void) static void cmd_help(void) { printf("usage: resctrl_tests [-h] [-b "benchmark_cmd [options]"] [-t test list] [-n no_of_bits]\n"); - printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CQM"); + printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT"); printf("\t default benchmark is builtin fill_buf\n"); printf("\t-t test list: run tests specified in the test list, "); - printf("e.g. -t mbm, mba, cqm, cat\n"); + printf("e.g. -t mbm, mba, cmt, cat\n"); printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n"); printf("\t-p cpu_no: specify CPU number to run the test. 1 is default\n"); printf("\t-h: help\n"); @@ -50,13 +50,13 @@ void tests_cleanup(void) { mbm_test_cleanup(); mba_test_cleanup(); - cqm_test_cleanup(); + cmt_test_cleanup(); cat_test_cleanup(); }

int main(int argc, char **argv) { - bool has_ben = false, mbm_test = true, mba_test = true, cqm_test = true; + bool has_ben = false, mbm_test = true, mba_test = true, cmt_test = true; int res, c, cpu_no = 1, span = 250, argc_new = argc, i, no_of_bits = 5; char *benchmark_cmd[BENCHMARK_ARGS], bw_report[64], bm_type[64]; char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE]; @@ -82,15 +82,15 @@ int main(int argc, char **argv)

mbm_test = false; mba_test = false; - cqm_test = false; + cmt_test = false; cat_test = false; while (token) { if (!strcmp(token, "mbm")) { mbm_test = true; } else if (!strcmp(token, "mba")) { mba_test = true; - } else if (!strcmp(token, "cqm")) { - cqm_test = true; + } else if (!strcmp(token, "cmt")) { + cmt_test = true; } else if (!strcmp(token, "cat")) { cat_test = true; } else { @@ -178,13 +178,13 @@ int main(int argc, char **argv) tests_run++; }

- if (cqm_test) { - printf("# Starting CQM test ...\n"); + if (cmt_test) { + printf("# Starting CMT test ...\n"); if (!has_ben) - sprintf(benchmark_cmd[5], "%s", "cqm"); - res = cqm_resctrl_val(cpu_no, no_of_bits, benchmark_cmd); - printf("%sok CQM: test\n", res ? "not " : ""); - cqm_test_cleanup(); + sprintf(benchmark_cmd[5], "%s", "cmt"); + res = cmt_resctrl_val(cpu_no, no_of_bits, benchmark_cmd); + printf("%sok CMT: test\n", res ? "not " : ""); + cmt_test_cleanup(); tests_run++; }

diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c index 520fea3606d1..270cd95e0026 100644 --- a/tools/testing/selftests/resctrl/resctrl_val.c +++ b/tools/testing/selftests/resctrl/resctrl_val.c @@ -492,7 +492,7 @@ static int print_results_bw(char *filename, int bm_pid, float bw_imc, return 0; }

-static void set_cqm_path(const char *ctrlgrp, const char *mongrp, char sock_num) +static void set_cmt_path(const char *ctrlgrp, const char *mongrp, char sock_num) { if (strlen(ctrlgrp) && strlen(mongrp)) sprintf(llc_occup_path, CON_MON_LCC_OCCUP_PATH, RESCTRL_PATH, @@ -512,7 +512,7 @@ static void set_cqm_path(const char *ctrlgrp, const char *mongrp, char sock_num) * @ctrlgrp: Name of the control monitor group (con_mon grp) * @mongrp: Name of the monitor group (mon grp) * @cpu_no: CPU number that the benchmark PID is binded to - * @resctrl_val: Resctrl feature (Eg: cat, cqm.. etc) + * @resctrl_val: Resctrl feature (Eg: cat, cmt.. etc) */ static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp, int cpu_no, char *resctrl_val) @@ -524,8 +524,8 @@ static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp, return; }

- if (strcmp(resctrl_val, "cqm") == 0) - set_cqm_path(ctrlgrp, mongrp, resource_id); + if (strcmp(resctrl_val, "cmt") == 0) + set_cmt_path(ctrlgrp, mongrp, resource_id); }

static int @@ -682,7 +682,7 @@ int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param)

initialize_mem_bw_resctrl(param->ctrlgrp, param->mongrp, param->cpu_no, resctrl_val); - } else if (strcmp(resctrl_val, "cqm") == 0) + } else if (strcmp(resctrl_val, "cmt") == 0) initialize_llc_occu_resctrl(param->ctrlgrp, param->mongrp, param->cpu_no, resctrl_val);

@@ -721,7 +721,7 @@ int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param) ret = measure_vals(param, &bw_resc_start); if (ret) break; - } else if (strcmp(resctrl_val, "cqm") == 0) { + } else if (strcmp(resctrl_val, "cmt") == 0) { ret = param->setup(1, param); if (ret) { ret = 0; diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 19c0ec4045a4..727e667e2cc9 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -334,7 +334,7 @@ void run_benchmark(int signum, siginfo_t *info, void *ucontext) operation = atoi(benchmark_cmd[4]); sprintf(resctrl_val, "%s", benchmark_cmd[5]);

- if (strcmp(resctrl_val, "cqm") != 0) + if (strcmp(resctrl_val, "cmt") != 0) buffer_span = span * MB; else buffer_span = span; @@ -458,8 +458,8 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp, if (ret) goto out;

- /* Create mon grp and write pid into it for "mbm" and "cqm" test */ - if ((strcmp(resctrl_val, "cqm") == 0) || + /* Create mon grp and write pid into it for "mbm" and "cmt" test */ + if ((strcmp(resctrl_val, "cmt") == 0) || (strcmp(resctrl_val, "mbm") == 0)) { if (strlen(mongrp)) { sprintf(monitorgroup_p, "%s/mon_groups", controlgroup); @@ -507,7 +507,7 @@ int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)

if ((strcmp(resctrl_val, "mba") != 0) && (strcmp(resctrl_val, "cat") != 0) && - (strcmp(resctrl_val, "cqm") != 0)) + (strcmp(resctrl_val, "cmt") != 0)) return -ENOENT;

if (!schemata) { @@ -528,7 +528,7 @@ int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val) else sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);

- if (!strcmp(resctrl_val, "cat") || !strcmp(resctrl_val, "cqm")) + if (!strcmp(resctrl_val, "cat") || !strcmp(resctrl_val, "cmt")) sprintf(schema, "%s%d%c%s", "L3:", resource_id, '=', schemata); if (strcmp(resctrl_val, "mba") == 0) sprintf(schema, "%s%d%c%s", "MB:", resource_id, '=', schemata);

From: Reinette Chatre reinette.chatre@intel.com

The format "%sok" is used to print results of a test. If the test passes, the empty string is printed and if the test fails "not " is printed. This results in output of "ok" when test passes and "not ok" when test fails.

Fix one instance where "not" (without a space) is printed on test failure resulting in output of "notok" on test failure.

Fixes: 78941183d1b1 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Signed-off-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/cmt_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c index 13b01e010238..6ffb56c6a1e2 100644 --- a/tools/testing/selftests/resctrl/cmt_test.c +++ b/tools/testing/selftests/resctrl/cmt_test.c @@ -58,7 +58,7 @@ static void show_cache_info(unsigned long sum_llc_occu_resc, int no_of_bits, else res = false;

- printf("%sok CMT: diff within %d, %d%%\n", res ? "" : "not", + printf("%sok CMT: diff within %d, %d%%\n", res ? "" : "not ", MAX_DIFF, (int)MAX_DIFF_PERCENT);

printf("# diff: %ld\n", avg_diff);

From: Reinette Chatre reinette.chatre@intel.com

Add a missing newline to the help text printed and fixup the next line to line it up to previous line for improved readability.

Fixes: 78941183d1b1 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Signed-off-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl_tests.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index 35a91cab1b88..b2a560c0c5dc 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -37,8 +37,8 @@ void detect_amd(void) static void cmd_help(void) { printf("usage: resctrl_tests [-h] [-b "benchmark_cmd [options]"] [-t test list] [-n no_of_bits]\n"); - printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT"); - printf("\t default benchmark is builtin fill_buf\n"); + printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT\n"); + printf("\t default benchmark is builtin fill_buf\n"); printf("\t-t test list: run tests specified in the test list, "); printf("e.g. -t mbm, mba, cmt, cat\n"); printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n");

resctrl test suite uses global variables (E.g: bm_pid, ppid, llc_occup_path and is_amd) that are used across .c files. These global variables are defined in resctrl.h file and the header file is included in .c files where needed. Sparse tool isn't very happy about defining global variables in .h file and hence complains as below

resctrl.h:65:7: warning: symbol 'bm_pid' was not declared. Should it be static? resctrl.h:65:15: warning: symbol 'ppid' was not declared. Should it be static? resctrl.h:66:5: warning: symbol 'tests_run' was not declared. Should it be static? resctrl.h:68:6: warning: symbol 'llc_occup_path' was not declared. Should it be static? resctrl.h:69:6: warning: symbol 'is_amd' was not declared. Should it be static?

Sparse tool thinks that since the variables are defined and not declared, it assumes that the scope of these variables is limited to a .c file and hence suggests making them static variables. But these variables are used across .c files and hence cannot be static variables.

Fix these warnings by declaring the variables (i.e. use extern keyword) rather than defining them in resctrl.h file.

Please note that sparse tool still complains about other issues and they will be fixed in later patches.

Fixes: 591a6e8588fc ("selftests/resctrl: Add basic resctrl file system operations and data") Reported-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index 68522b19b235..814d0dd517a4 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -62,11 +62,11 @@ struct resctrl_val_param { int (*setup)(int num, ...); };

-pid_t bm_pid, ppid; -int tests_run; +extern pid_t bm_pid, ppid; +extern int tests_run;

-char llc_occup_path[1024]; -bool is_amd; +extern char llc_occup_path[1024]; +extern bool is_amd;

bool check_resctrlfs_support(void); int filter_dmesg(void);

Resctrl test suite before running any unit test (like cmt, cat, mbm and mba) should first check if the feature is enabled (by kernel and not just supported by H/W) on the platform or not. validate_resctrl_feature_request() is supposed to do that. This function intends to grep for relevant flags in /proc/cpuinfo but there are several issues here

1. validate_resctrl_feature_request() calls fgrep() to get flags from /proc/cpuinfo. But, fgrep() can only return a string with maximum of 255 characters and hence the complete cpu flags are never returned. 2. The substring search logic is also busted. If strstr() finds requested resctrl feature in the cpu flags, it returns pointer to the first occurrence. But, the logic negates the return value of strstr() and hence validate_resctrl_feature_request() returns false if the feature is present in the cpu flags and returns true if the feature is not present. 3. validate_resctrl_feature_request() checks if a resctrl feature is reported in /proc/cpuinfo flags or not. Having a cpu flag means that the H/W supports the feature, but it doesn't mean that the kernel enabled it. A user could selectively enable only a subset of resctrl features using kernel command line arguments. Hence, /proc/cpuinfo isn't a reliable source to check if a feature is enabled or not.

The 3rd issue being the major one and fixing it requires changing the way validate_resctrl_feature_request() works. Since, /proc/cpuinfo isn't the right place to check if a resctrl feature is enabled or not, a more appropriate place is /sys/fs/resctrl/info directory. Change validate_resctrl_feature_request() such that,

1. For cat, check if /sys/fs/resctrl/info/L3 directory is present or not 2. For mba, check if /sys/fs/resctrl/info/MB directory is present or not 3. For cmt, check if /sys/fs/resctrl/info/L3_MON directory is present and check if /sys/fs/resctrl/info/L3_MON/mon_features has llc_occupancy 4. For mbm, check if /sys/fs/resctrl/info/L3_MON directory is present and check if /sys/fs/resctrl/info/L3_MON/mon_features has mbm_<total/local>_bytes

Please note that only L3_CAT, L3_CMT, MBA and MBM are supported. CDP and L2 variants can be added later.

Fixes: 591a6e8588fc ("selftests/resctrl: Add basic resctrl file system operations and data") Reported-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl.h | 6 ++- tools/testing/selftests/resctrl/resctrlfs.c | 51 ++++++++++++++++----- 2 files changed, 45 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index 814d0dd517a4..65ca24bf3eac 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -28,6 +28,10 @@ #define RESCTRL_PATH "/sys/fs/resctrl" #define PHYS_ID_PATH "/sys/devices/system/cpu/cpu" #define CBM_MASK_PATH "/sys/fs/resctrl/info" +#define L3_PATH "/sys/fs/resctrl/info/L3" +#define MB_PATH "/sys/fs/resctrl/info/MB" +#define L3_MON_PATH "/sys/fs/resctrl/info/L3_MON" +#define L3_MON_FEATURES_PATH "/sys/fs/resctrl/info/L3_MON/mon_features"

#define PARENT_EXIT(err_msg) \ do { \ @@ -74,7 +78,7 @@ int remount_resctrlfs(bool mum_resctrlfs); int get_resource_id(int cpu_no, int *resource_id); int umount_resctrlfs(void); int validate_bw_report_request(char *bw_report); -bool validate_resctrl_feature_request(char *resctrl_val); +bool validate_resctrl_feature_request(const char *resctrl_val); char *fgrep(FILE *inf, const char *str); int taskset_benchmark(pid_t bm_pid, int cpu_no); void run_benchmark(int signum, siginfo_t *info, void *ucontext); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index e43ddebd1aa4..67d775d03271 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -618,26 +618,55 @@ char *fgrep(FILE *inf, const char *str) * validate_resctrl_feature_request - Check if requested feature is valid. * @resctrl_val: Requested feature * - * Return: 0 on success, non-zero on failure + * Return: True if the feature is supported, else false */ -bool validate_resctrl_feature_request(char *resctrl_val) +bool validate_resctrl_feature_request(const char *resctrl_val) { - FILE *inf = fopen("/proc/cpuinfo", "r"); + struct stat statbuf; bool found = false; char *res; + FILE *inf;

- if (!inf) + if (!resctrl_val) return false;

- res = fgrep(inf, "flags"); - - if (res) { - char *s = strchr(res, ':'); + if (remount_resctrlfs(false)) + return false;

- found = s && !strstr(s, resctrl_val); - free(res); + if (!strcmp(resctrl_val, "cat")) { + if (!stat(L3_PATH, &statbuf)) + return true; + } else if (!strcmp(resctrl_val, "mba")) { + if (!stat(MB_PATH, &statbuf)) + return true; + } else if (!strcmp(resctrl_val, "mbm") || !strcmp(resctrl_val, "cmt")) { + if (!stat(L3_MON_PATH, &statbuf)) { + inf = fopen(L3_MON_FEATURES_PATH, "r"); + if (!inf) + return false; + + if (!strcmp(resctrl_val, "cmt")) { + res = fgrep(inf, "llc_occupancy"); + if (res) { + found = true; + free(res); + } + } + + if (!strcmp(resctrl_val, "mbm")) { + res = fgrep(inf, "mbm_total_bytes"); + if (res) { + free(res); + res = fgrep(inf, "mbm_local_bytes"); + if (res) { + found = true; + free(res); + } + } + } + fclose(inf); + } } - fclose(inf);

return found; }

resctrl test suite accepts command line arguments (like -b, -t, -n and -p) as documented in the help. But passing -n and -p throws an invalid option error. This happens because -n and -p are missing in the list of characters that getopt() recognizes as valid arguments. Hence, they are treated as invalid options.

Fix this by adding them to the list of characters that getopt() recognizes as valid arguments. Please note that the main() function already has the logic to deal with the values passed as part of these arguments and hence no changes are needed there.

Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl_tests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index d24de546d4ef..cab69ed8c67d 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -73,7 +73,7 @@ int main(int argc, char **argv) } }

- while ((c = getopt(argc_new, argv, "ht:b:")) != -1) { + while ((c = getopt(argc_new, argv, "ht:b:n:p:")) != -1) { char *token;

switch (c) {

Running any resctrl unit test involves writing to resctrl file system and only a root user has permission to write to resctrl FS. Resctrl test suite before running any test checks for the privilege of the user and if it's not a root user, the test suite prints a warning and continues attempting to run tests.

Attempting to run any test without root privileges will fail as below

TAP version 13 ok kernel supports resctrl filesystem ................. not ok mounting resctrl to "/sys/fs/resctrl" not ok MBA: schemata change

Hence, don't attempt to run any test if the user is not a root user and change the warning message to a bail out message to comply with TAP 13 standards.

Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl_tests.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index cab69ed8c67d..f4867a81eee6 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -125,8 +125,10 @@ int main(int argc, char **argv) * 1. We write to resctrl FS * 2. We execute perf commands */ - if (geteuid() != 0) - printf("# WARNING: not running as root, tests may fail.\n"); + if (geteuid() != 0) { + printf("Bail out! not running as root, abort testing\n"); + goto out; + }

/* Detect AMD vendor */ detect_amd();

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.

Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest") Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/cat_test.c | 5 ++++- tools/testing/selftests/resctrl/resctrl_tests.c | 8 ++++++-- 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c index 5da43767b973..1bce84e23783 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -151,7 +151,10 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type) /* Get max number of bits from default-cabm mask */ count_of_bits = count_bits(long_mask);

- if (n < 1 || n > count_of_bits - 1) { + if (!n) + n = count_of_bits / 2; + + if (n > count_of_bits - 1) { printf("Invalid input value for no_of_bits n!\n"); printf("Please Enter value in range 1 to %d\n", count_of_bits - 1); diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index f4867a81eee6..5c217d0228f4 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -57,7 +57,7 @@ void tests_cleanup(void) int main(int argc, char **argv) { bool has_ben = false, mbm_test = true, mba_test = true, cmt_test = true; - int res, c, cpu_no = 1, span = 250, argc_new = argc, i, no_of_bits = 5; + int res, c, cpu_no = 1, span = 250, argc_new = argc, i, no_of_bits = 0; char *benchmark_cmd[BENCHMARK_ARGS], bw_report[64], bm_type[64]; char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE]; int ben_ind, ben_count; @@ -106,6 +106,10 @@ int main(int argc, char **argv) break; case 'n': no_of_bits = atoi(optarg); + if (no_of_bits <= 0) { + printf("Bail out! invalid argument for no_of_bits\n"); + return -1; + } break; case 'h': cmd_help(); @@ -188,7 +192,7 @@ int main(int argc, char **argv) printf("# Starting CMT test ...\n"); if (!has_ben) sprintf(benchmark_cmd[5], "%s", "cmt"); - res = cmt_resctrl_val(cpu_no, no_of_bits, benchmark_cmd); + res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd); printf("%sok CMT: test\n", res ? "not " : ""); cmt_test_cleanup(); tests_run++;

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

Fixes: 01fee6b4d1f9 ("selftests/resctrl: Add MBA test") Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Fixes: 78941183d1b15 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Fixes: 790bf585b0eee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest") Suggested-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/cat_test.c | 3 --- tools/testing/selftests/resctrl/cmt_test.c | 3 --- tools/testing/selftests/resctrl/mba_test.c | 3 --- tools/testing/selftests/resctrl/mbm_test.c | 3 --- .../testing/selftests/resctrl/resctrl_tests.c | 24 +++++++++++++++++++ 5 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c index 1bce84e23783..a18a37ce626c 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -132,9 +132,6 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type) if (ret) return ret;

- if (!validate_resctrl_feature_request("cat")) - return -1; - /* Get default cbm mask for L3/L2 cache */ ret = get_cbm_mask(cache_type); if (ret) diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c index 282ba7fcf17c..119ae65abec7 100644 --- a/tools/testing/selftests/resctrl/cmt_test.c +++ b/tools/testing/selftests/resctrl/cmt_test.c @@ -122,9 +122,6 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd) if (ret) return ret;

- if (!validate_resctrl_feature_request("cmt")) - return -1; - ret = get_cbm_mask("L3"); if (ret) return ret; diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c index ba0234d4829e..6f09d46a5424 100644 --- a/tools/testing/selftests/resctrl/mba_test.c +++ b/tools/testing/selftests/resctrl/mba_test.c @@ -156,9 +156,6 @@ int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)

remove(RESULT_FILE_NAME);

- if (!validate_resctrl_feature_request("mba")) - return -1; - ret = resctrl_val(benchmark_cmd, &param); if (ret) return ret; diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c index ca610c3ebc8c..cb3113cb3b10 100644 --- a/tools/testing/selftests/resctrl/mbm_test.c +++ b/tools/testing/selftests/resctrl/mbm_test.c @@ -129,9 +129,6 @@ int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd)

remove(RESULT_FILE_NAME);

- if (!validate_resctrl_feature_request("mbm")) - return -1; - ret = resctrl_val(benchmark_cmd, &param); if (ret) return ret; diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index be7cd57efca8..a22dc96c0b43 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -60,6 +60,12 @@ static void run_mbm_test(bool has_ben, char **benchmark_cmd, int span, int res;

printf("# Starting MBM BW change ...\n"); + + if (!validate_resctrl_feature_request("mbm")) { + printf("ok MBM # SKIP Hardware does not support MBM or MBM is disabled\n"); + return; + } + if (!has_ben) sprintf(benchmark_cmd[5], "%s", "mba"); res = mbm_bw_change(span, cpu_no, bw_report, benchmark_cmd); @@ -74,6 +80,12 @@ static void run_mba_test(bool has_ben, char **benchmark_cmd, int span, int res;

printf("# Starting MBA Schemata change ...\n"); + + if (!validate_resctrl_feature_request("mba")) { + printf("ok MBA # SKIP Hardware does not support MBA or MBA is disabled\n"); + return; + } + if (!has_ben) sprintf(benchmark_cmd[1], "%d", span); res = mba_schemata_change(cpu_no, bw_report, benchmark_cmd); @@ -87,6 +99,12 @@ static void run_cmt_test(bool has_ben, char **benchmark_cmd, int cpu_no) int res;

printf("# Starting CMT test ...\n"); + + if (!validate_resctrl_feature_request("cmt")) { + printf("ok CMT # SKIP Hardware does not support CMT or CMT is disabled\n"); + return; + } + if (!has_ben) sprintf(benchmark_cmd[5], "%s", "cmt"); res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd); @@ -100,6 +118,12 @@ static void run_cat_test(int cpu_no, int no_of_bits) int res;

printf("# Starting CAT test ...\n"); + + if (!validate_resctrl_feature_request("cat")) { + printf("ok CAT # SKIP Hardware does not support CAT or CAT is disabled\n"); + return; + } + res = cat_perf_miss_val(cpu_no, no_of_bits, "L3"); printf("%sok CAT: test\n", res ? "not " : ""); tests_run++;

Resctrl test suite is expected to unmount the resctrl file system upon exit. But there are few scenarios where resctrl test suite might forget to 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.

Fix this by calling umount_resctrlfs() before returning from main() function, so that the resctrl FS will always be unmounted upon exit.

Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl_tests.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index a22dc96c0b43..fb66da65b373 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -257,6 +257,7 @@ int main(int argc, char **argv) run_cat_test(cpu_no, no_of_bits);

out: + umount_resctrlfs(); printf("1..%d\n", tests_run);

return 0;

Dan reported following static checker warnings

tools/testing/selftests/resctrl/resctrl_val.c:545 measure_vals() warn: 'bw_imc' unsigned <= 0

tools/testing/selftests/resctrl/resctrl_val.c:549 measure_vals() warn: 'bw_resc_end' unsigned <= 0

These warnings are reported because 1. measure_vals() declares 'bw_imc' and 'bw_resc_end' as unsigned long variables 2. Return value of get_mem_bw_imc() and get_mem_bw_resctrl() are assigned to 'bw_imc' and 'bw_resc_end' respectively 3. The returned values are checked for <= 0 to see if the calls failed

Checking for < 0 for an unsigned value doesn't make any sense.

Fix this issue by changing the implementation of get_mem_bw_imc() and get_mem_bw_resctrl() such that they now accept reference to a variable and set the variable appropriately upon success and return 0, else return < 0 on error.

Fixes: 7f4d257e3a2a ("selftests/resctrl: Add callback to start a benchmark") Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/resctrl_val.c | 41 +++++++++++-------- 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c index 88f9b641d753..f723d8534cf2 100644 --- a/tools/testing/selftests/resctrl/resctrl_val.c +++ b/tools/testing/selftests/resctrl/resctrl_val.c @@ -300,9 +300,9 @@ static int initialize_mem_bw_imc(void) * Memory B/W utilized by a process on a socket can be calculated using * iMC counters. Perf events are used to read these counters. * - * Return: >= 0 on success. < 0 on failure. + * Return: = 0 on success. < 0 on failure. */ -static float get_mem_bw_imc(int cpu_no, char *bw_report) +static int get_mem_bw_imc(int cpu_no, char *bw_report, float *bw_imc) { float reads, writes, of_mul_read, of_mul_write; int imc, j, ret; @@ -373,13 +373,18 @@ static float get_mem_bw_imc(int cpu_no, char *bw_report) close(imc_counters_config[imc][WRITE].fd); }

- if (strcmp(bw_report, "reads") == 0) - return reads; + if (strcmp(bw_report, "reads") == 0) { + *bw_imc = reads; + return 0; + }

- if (strcmp(bw_report, "writes") == 0) - return writes; + if (strcmp(bw_report, "writes") == 0) { + *bw_imc = writes; + return 0; + }

- return (reads + writes); + *bw_imc = reads + writes; + return 0; }

void set_mbm_path(const char *ctrlgrp, const char *mongrp, int resource_id) @@ -438,9 +443,8 @@ static void initialize_mem_bw_resctrl(const char *ctrlgrp, const char *mongrp, * 1. If con_mon grp is given, then read from it * 2. If con_mon grp is not given, then read from root con_mon grp */ -static unsigned long get_mem_bw_resctrl(void) +static int get_mem_bw_resctrl(unsigned long *mbm_total) { - unsigned long mbm_total = 0; FILE *fp;

fp = fopen(mbm_total_path, "r"); @@ -449,7 +453,7 @@ static unsigned long get_mem_bw_resctrl(void)

return -1; } - if (fscanf(fp, "%lu", &mbm_total) <= 0) { + if (fscanf(fp, "%lu", mbm_total) <= 0) { perror("Could not get mbm local bytes"); fclose(fp);

@@ -457,7 +461,7 @@ static unsigned long get_mem_bw_resctrl(void) } fclose(fp);

- return mbm_total; + return 0; }

pid_t bm_pid, ppid; @@ -549,7 +553,8 @@ static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp, static int measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start) { - unsigned long bw_imc, bw_resc, bw_resc_end; + unsigned long bw_resc, bw_resc_end; + float bw_imc; int ret;

/* @@ -559,13 +564,13 @@ measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start) * Compare the two values to validate resctrl value. * It takes 1sec to measure the data. */ - bw_imc = get_mem_bw_imc(param->cpu_no, param->bw_report); - if (bw_imc <= 0) - return bw_imc; + ret = get_mem_bw_imc(param->cpu_no, param->bw_report, &bw_imc); + if (ret < 0) + return ret;

- bw_resc_end = get_mem_bw_resctrl(); - if (bw_resc_end <= 0) - return bw_resc_end; + ret = get_mem_bw_resctrl(&bw_resc_end); + if (ret < 0) + return ret;

bw_resc = (bw_resc_end - *bw_resc_start) / MB; ret = print_results_bw(param->filename, bm_pid, bw_imc, bw_resc);

Reinette reported following compilation issue on Fedora 32, gcc version 10.1.1

/usr/bin/ld: cmt_test.o:<src_dir>/cmt_test.c:19: multiple definition of `cbm_mask'; cat_test.o:<src_dir>/cat_test.c:20: first defined here /usr/bin/ld: resctrlfs.o:<src_dir>/resctrlfs.c:52: multiple definition of `cbm_mask'; cat_test.o:<src_dir>/cat_test.c:20: first defined here

Compiler throws an error because cbm_mask is defined as a global variable in three different .c files, namely resctrlfs.c, cat_test.c and cmt_test.c.

cbm_mask is a global variable that is supposed to hold the capacity bitmask (CBM) value read from resctrl/info directory. This is done by get_cbm_mask() function which then sets the global variable.

To reduce the use of global variables (thereby improving readability and maintainability) change get_cbm_mask() implementation such that it now accepts a reference to a string. Upon success, get_cbm_mask() populates the string with CBM value read from resctrl/info directory and returns 0 and on failure, returns -1.

Please note that this change to get_cbm_mask() fixes the issue reported by Reinette because cbm_mask isn't a global variable anymore.

Fixes: 78941183d1b15 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Fixes: 790bf585b0eee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest") Reported-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com --- tools/testing/selftests/resctrl/cat_test.c | 5 ++--- tools/testing/selftests/resctrl/cmt_test.c | 5 ++--- tools/testing/selftests/resctrl/resctrl.h | 2 +- tools/testing/selftests/resctrl/resctrlfs.c | 10 +++++----- 4 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c index e518f8f7b4d8..60b31b85b484 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -17,8 +17,6 @@ #define MAX_DIFF_PERCENT 4 #define MAX_DIFF 1000000

-char cbm_mask[256]; - /* * Change schemata. Write schemata to specified * con_mon grp, mon_grp in resctrl FS. @@ -120,6 +118,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type) { unsigned long l_mask, l_mask_1, long_mask, cache_size; int ret, pipefd[2], sibling_cpu_no, count_of_bits; + char cbm_mask[256]; char pipe_message; pid_t bm_pid;

@@ -130,7 +129,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type) return ret;

/* Get default cbm mask for L3/L2 cache */ - ret = get_cbm_mask(cache_type); + ret = get_cbm_mask(cache_type, cbm_mask); if (ret) return ret;

diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c index f0cb441cca9f..0bee3e6480a3 100644 --- a/tools/testing/selftests/resctrl/cmt_test.c +++ b/tools/testing/selftests/resctrl/cmt_test.c @@ -16,8 +16,6 @@ #define MAX_DIFF 2000000 #define MAX_DIFF_PERCENT 15

-char cbm_mask[256]; - static int cmt_setup(int num, ...) { struct resctrl_val_param *p; @@ -112,6 +110,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd) { int ret, mum_resctrlfs, count_of_bits; unsigned long long_mask, cache_size; + char cbm_mask[256];

cache_size = 0; mum_resctrlfs = 1; @@ -120,7 +119,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd) if (ret) return ret;

- ret = get_cbm_mask("L3"); + ret = get_cbm_mask("L3", cbm_mask); if (ret) return ret;

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index 65ca24bf3eac..2546435864d0 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -96,7 +96,7 @@ void tests_cleanup(void); void mbm_test_cleanup(void); int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd); void mba_test_cleanup(void); -int get_cbm_mask(char *cache_type); +int get_cbm_mask(char *cache_type, char *cbm_mask); int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size); void ctrlc_handler(int signum, siginfo_t *info, void *ptr); int cat_val(struct resctrl_val_param *param); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 21281fd895b7..a07118e01590 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -49,8 +49,6 @@ static int find_resctrl_mount(char *buffer) return -ENOENT; }

-char cbm_mask[256]; - /* * remount_resctrlfs - Remount resctrl FS at /sys/fs/resctrl * @mum_resctrlfs: Should the resctrl FS be remounted? @@ -208,16 +206,18 @@ int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size) /* * get_cbm_mask - Get cbm mask for given cache * @cache_type: Cache level L2/L3 - * - * Mask is stored in cbm_mask which is global variable. + * @cbm_mask: cbm_mask returned as a string * * Return: = 0 on success, < 0 on failure. */ -int get_cbm_mask(char *cache_type) +int get_cbm_mask(char *cache_type, char *cbm_mask) { char cbm_mask_path[1024]; FILE *fp;

+ if (!cbm_mask) + return -1; + sprintf(cbm_mask_path, "%s/%s/cbm_mask", CBM_MASK_PATH, cache_type);

fp = fopen(cbm_mask_path, "r");