// SPDX-License-Identifier: GPL-2.0 #include <stdint.h>#include "resctrl.h" char llc_occup_path[1024]; void perf_event_attr_initialize(struct perf_event_attr *pea, __u64 config){	memset(pea, 0, sizeof(*pea));	pea->type = PERF_TYPE_HARDWARE;	pea->size = sizeof(*pea);	pea->exclude_kernel = 1;	pea->exclude_hv = 1;	pea->exclude_idle = 1;	pea->exclude_callchain_kernel = 1;	pea->inherit = 1;	pea->exclude_guest = 1;	pea->disabled = 1;	pea->config = config;} /* Start counters to log values */int perf_event_reset_enable(int pe_fd){	int ret; 	ret = ioctl(pe_fd, PERF_EVENT_IOC_RESET, 0);	if (ret < 0)		return ret; 	ret = ioctl(pe_fd, PERF_EVENT_IOC_ENABLE, 0);	if (ret < 0)		return ret; 	return 0;} int perf_open(struct perf_event_attr *pea, pid_t pid, int cpu_no){	int pe_fd; 	pe_fd = perf_event_open(pea, pid, cpu_no, -1, PERF_FLAG_FD_CLOEXEC);	if (pe_fd == -1) {		ksft_perror("Unable to set up performance monitoring");		return -1;	} 	perf_event_reset_enable(pe_fd); 	return pe_fd;} /* * Get LLC Occupancy as reported by RESCTRL FS * 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 * 3. If both not given, then read from root con_mon grp * For CAT, * 1. If con_mon grp given, then read from it * 2. If con_mon grp not given, then read from root con_mon grp * * Return: =0 on success.  <0 on failure. */static int get_llc_occu_resctrl(unsigned long *llc_occupancy){	FILE *fp; 	fp = fopen(llc_occup_path, "r");	if (!fp) {		ksft_perror("Failed to open results file"); 		return -1;	}	if (fscanf(fp, "%lu", llc_occupancy) <= 0) {		ksft_perror("Could not get llc occupancy");		fclose(fp); 		return -1;	}	fclose(fp); 	return 0;} /* * print_results_cache:	the cache results are stored in a file * @filename:		file that stores the results * @bm_pid:		child pid that runs benchmark * @llc_value:		perf miss value / *			llc occupancy value reported by resctrl FS * * Return:		0 on success, < 0 on error. */static int print_results_cache(const char *filename, pid_t bm_pid, __u64 llc_value){	FILE *fp; 	if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {		printf("Pid: %d \t LLC_value: %llu\n", (int)bm_pid, llc_value);	} else {		fp = fopen(filename, "a");		if (!fp) {			ksft_perror("Cannot open results file"); 			return -1;		}		fprintf(fp, "Pid: %d \t llc_value: %llu\n", (int)bm_pid, llc_value);		fclose(fp);	} 	return 0;} /* * perf_event_measure - Measure perf events * @filename:	Filename for writing the results * @bm_pid:	PID that runs the benchmark * * Measures perf events (e.g., cache misses) and writes the results into * @filename. @bm_pid is written to the results file along with the measured * value. * * Return: =0 on success. <0 on failure. */int perf_event_measure(int pe_fd, const char *filename, pid_t bm_pid){	__u64 value;	int ret; 	/* Stop counters after one span to get miss rate */	ret = ioctl(pe_fd, PERF_EVENT_IOC_DISABLE, 0);	if (ret < 0)		return ret; 	ret = read(pe_fd, &value, sizeof(value));	if (ret == -1) {		ksft_perror("Could not get perf value");		return -1;	} 	return print_results_cache(filename, bm_pid, value);} /* * measure_llc_resctrl - Measure resctrl LLC value from resctrl * @filename:	Filename for writing the results * @bm_pid:	PID that runs the benchmark * * Measures LLC occupancy from resctrl and writes the results into @filename. * @bm_pid is written to the results file along with the measured value. * * Return: =0 on success. <0 on failure. */int measure_llc_resctrl(const char *filename, pid_t bm_pid){	unsigned long llc_occu_resc = 0;	int ret; 	ret = get_llc_occu_resctrl(&llc_occu_resc);	if (ret < 0)		return ret; 	return print_results_cache(filename, bm_pid, llc_occu_resc);} /* * Reduce L2 allocation to minimum when testing L3 cache allocation. */int minimize_l2_occupancy(const struct resctrl_test *test,			  const struct user_params *uparams,			  const struct resctrl_val_param *param){	if (!strcmp(test->resource, "L3") && resctrl_resource_exists("L2"))		return write_schemata(param->ctrlgrp, "0x1", uparams->cpu, "L2"); 	return 0;} /* * show_cache_info - Show generic cache test information * @no_of_bits:		Number of bits * @avg_llc_val:	Average of LLC cache result data * @cache_span:		Cache span * @lines:		@cache_span in lines or bytes */void show_cache_info(int no_of_bits, __u64 avg_llc_val, size_t cache_span, bool lines){	ksft_print_msg("Number of bits: %d\n", no_of_bits);	ksft_print_msg("Average LLC val: %llu\n", avg_llc_val);	ksft_print_msg("Cache span (%s): %zu\n", lines ? "lines" : "bytes",		       cache_span);}