1 // SPDX-License-Identifier: GPL-2.0
19  * test with n bits is MIN_DIFF_PERCENT_PER_BIT * (n - 1). With e.g. 5 vs 4
21  * MIN_DIFF_PERCENT_PER_BIT * (4 - 1) = 3 percent.
44 		float delta = (__s64)(avg_llc_val - *prev_avg_llc_val);  in show_results_info()
81 	fp = fopen(param->filename, "r");  in check_results()
85 		return -1;  in check_results()
115 					MIN_DIFF_PERCENT_PER_BIT * (bits - 1),  in check_results()
137  * cat_test - Execute CAT benchmark and measure cache misses
169 	if (strcmp(param->filename, "") == 0)  in cat_test()
170 		sprintf(param->filename, "stdio");  in cat_test()
175 	ret = taskset_benchmark(bm_pid, uparams->cpu, &old_affinity);  in cat_test()
180 	ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp);  in cat_test()
186 	pe_fd = perf_open(&pea, bm_pid, uparams->cpu);  in cat_test()
188 		ret = -1;  in cat_test()
194 		ret = -1;  in cat_test()
199 		snprintf(schemata, sizeof(schemata), "%lx", param->mask & ~current_mask);  in cat_test()
200 		ret = write_schemata("", schemata, uparams->cpu, test->resource);  in cat_test()
204 		ret = write_schemata(param->ctrlgrp, schemata, uparams->cpu, test->resource);  in cat_test()
218 			ret = perf_event_measure(pe_fd, &pe_read, param->filename, bm_pid);  in cat_test()
239 	int n = uparams->bits;  in cat_run_test()
245 	ret = get_full_cbm(test->resource, &full_cache_mask);  in cat_run_test()
248 	/* Get the largest contiguous exclusive portion of the cache */  in cat_run_test()
249 	ret = get_mask_no_shareable(test->resource, &long_mask);  in cat_run_test()
254 	ret = get_cache_size(uparams->cpu, test->resource, &cache_total_size);  in cat_run_test()
264 	if (n > count_of_bits - 1) {  in cat_run_test()
267 			       count_of_bits - 1);  in cat_run_test()
268 		return -1;  in cat_run_test()
286 	ret = check_results(&param, test->resource,  in cat_run_test()
293 	/* AMD always supports non-contiguous CBM. */  in arch_supports_noncont_cat()
299 	/* Intel support for non-contiguous CBM needs to be discovered. */  in arch_supports_noncont_cat()
300 	if (!strcmp(test->resource, "L3"))  in arch_supports_noncont_cat()
302 	else if (!strcmp(test->resource, "L2"))  in arch_supports_noncont_cat()
322 	ret = resource_info_unsigned_get(test->resource, "sparse_masks", &sparse_masks);  in noncont_cat_run_test()
327 		ksft_print_msg("Hardware and kernel differ on non-contiguous CBM support!\n");  in noncont_cat_run_test()
332 	ret = get_full_cbm(test->resource, &full_cache_mask);  in noncont_cat_run_test()
343 		return -EINVAL;  in noncont_cat_run_test()
346 	/* Contiguous mask write check. */  in noncont_cat_run_test()
348 	ret = write_schemata("", schemata, uparams->cpu, test->resource);  in noncont_cat_run_test()
350 		ksft_print_msg("Write of contiguous CBM failed\n");  in noncont_cat_run_test()
355 	 * Non-contiguous mask write check. CBM has a 0xf hole approximately in the middle.  in noncont_cat_run_test()
358 	noncont_mask = ~(0xfUL << (bit_center - 2)) & full_cache_mask;  in noncont_cat_run_test()
360 	ret = write_schemata("", schemata, uparams->cpu, test->resource);  in noncont_cat_run_test()
362 		ksft_print_msg("Non-contiguous CBMs supported but write of non-contiguous CBM failed\n");  in noncont_cat_run_test()
364 …ksft_print_msg("Non-contiguous CBMs not supported and write of non-contiguous CBM failed as expect…  in noncont_cat_run_test()
366 		ksft_print_msg("Non-contiguous CBMs not supported but write of non-contiguous CBM succeeded\n");  in noncont_cat_run_test()
373 	if (!resctrl_resource_exists(test->resource))  in noncont_cat_feature_check()
376 	return resource_info_file_exists(test->resource, "sparse_masks");  in noncont_cat_feature_check()