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Subject[PATCH 1/7] selftests/resctrl: Add basic resctrl file system operations and data
Date
From: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>

The basic resctrl file system operations and data are added for future
usage by resctrl selftest tool.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
tools/testing/selftests/resctrl/Makefile | 10 +
tools/testing/selftests/resctrl/resctrl.c | 367 ++++++++++++++++++++++++++++++
tools/testing/selftests/resctrl/resctrl.h | 74 ++++++
3 files changed, 451 insertions(+)
create mode 100644 tools/testing/selftests/resctrl/Makefile
create mode 100644 tools/testing/selftests/resctrl/resctrl.c
create mode 100644 tools/testing/selftests/resctrl/resctrl.h

diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
new file mode 100644
index 000000000000..bd5c5418961e
--- /dev/null
+++ b/tools/testing/selftests/resctrl/Makefile
@@ -0,0 +1,10 @@
+CC = gcc
+CFLAGS = -g -Wall
+
+*.o: *.c
+ $(CC) $(CFLAGS) -c *.c
+
+.PHONY: clean
+
+clean:
+ $(RM) *.o *~
diff --git a/tools/testing/selftests/resctrl/resctrl.c b/tools/testing/selftests/resctrl/resctrl.c
new file mode 100644
index 000000000000..61014228ea24
--- /dev/null
+++ b/tools/testing/selftests/resctrl/resctrl.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Basic resctrl file system operations
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Authors:
+ * Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@intel.com>
+ * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
+ * Fenghua Yu <fenghua.yu@intel.com>
+ */
+#include "resctrl.h"
+
+/*
+ * remount_resctrlfs: Remount resctrl FS at /sys/fs/resctrl
+ * @mum_resctrlfs: Should the resctrl FS be remounted?
+ * If not mounted, mount it.
+ * If mounted and mum_resctrlfs then remount resctrl FS.
+ * If mounted and !mum_resctrlfs then noop
+ */
+void remount_resctrlfs(bool mum_resctrlfs)
+{
+ DIR *dp;
+ struct dirent *ep;
+ unsigned int count = 0;
+
+ /*
+ * If kernel is built with CONFIG_RESCTRL, then /sys/fs/resctrl should
+ * be present by default
+ */
+ dp = opendir(RESCTRL_PATH);
+ if (dp != NULL) {
+ while ((ep = readdir(dp)) != NULL)
+ count++;
+ closedir(dp);
+ } else {
+ PERR_EXIT("Unable to read /sys/fs/resctrl");
+ }
+
+ /*
+ * If resctrl FS has more than two entries, it means that resctrl FS has
+ * already been mounted. The two default entries are "." and "..", these
+ * are present even when resctrl FS is not mounted
+ */
+ if (count > 2) {
+ if (mum_resctrlfs) {
+ if (umount(RESCTRL_PATH) != 0)
+ PERR_EXIT("Unable to umount resctrl");
+ printf("Remount: done!\n");
+ } else {
+ printf("Not remounting!\n");
+ return;
+ }
+ }
+
+ if (mount("resctrl", RESCTRL_PATH, "resctrl", 0, NULL) != 0)
+ PERR_EXIT("Unable to mount resctrl FS at /sys/fs/resctrl");
+}
+
+char get_sock_num(int cpu_no)
+{
+ char sock_num, phys_pkg_path[1024];
+ FILE *fp;
+
+ sprintf(phys_pkg_path, "%s%d/topology/physical_package_id",
+ PHYS_ID_PATH, cpu_no);
+ fp = fopen(phys_pkg_path, "r");
+ if (!fp || fscanf(fp, "%c", &sock_num) <= 0 || fclose(fp) == EOF)
+ CHILD_EXIT("Could not get socket number");
+
+ return sock_num;
+}
+
+/*
+ * taskset_benchmark: Taskset PID (i.e. benchmark) to a specified cpu
+ * @bm_pid: PID that should be binded
+ * @cpu_no: CPU number at which the PID would be binded
+ */
+void taskset_benchmark(pid_t bm_pid, int cpu_no)
+{
+ cpu_set_t my_set;
+
+ CPU_ZERO(&my_set);
+ CPU_SET(cpu_no, &my_set);
+
+ if (sched_setaffinity(bm_pid, sizeof(cpu_set_t), &my_set))
+ CHILD_EXIT("Unable to taskset benchmark");
+
+ printf("Taskset benchmark: done!\n");
+}
+
+/*
+ * Run a specified benchmark or fill buffer (default benchmark) by directing
+ * benchmark stdio to /dev/null
+ */
+void run_benchmark(int signum, siginfo_t *info, void *ucontext)
+{
+ char **benchmark_cmd = info->si_ptr;
+ int span, operation;
+
+ /*
+ * Direct stdio of child to /dev/null, so that only parent writes to
+ * stdio (console)
+ */
+ if (freopen("/dev/null", "w", stdout) == NULL)
+ PARENT_EXIT("Unable to direct BM op to /dev/null");
+
+ if (strcmp(benchmark_cmd[0], "fill_buf") == 0) {
+ span = atoi(benchmark_cmd[1]);
+ operation = atoi(benchmark_cmd[4]);
+ if (run_fill_buf(span, 1, 1, operation))
+ printf("Error in running fill buffer\n");
+ } else {
+ benchmark_cmd[ben_count] = malloc(1024 * sizeof(char));
+ sprintf(benchmark_cmd[ben_count], "%s", "NULL");
+ /* Replace child with specified benchmark */
+ execvp(benchmark_cmd[0], benchmark_cmd);
+ }
+
+ PARENT_EXIT("Unable to run specified benchmark");
+}
+
+/*
+ * create_con_mon_grp: Create a con_mon group *only* if one doesn't exist
+ * @ctrlgrp: Name of the con_mon group
+ * @controlgroup: Path at which it should be created
+ */
+void create_con_mon_grp(const char *ctrlgrp, const char *controlgroup)
+{
+ int found_ctrl_grp = 0;
+ struct dirent *ep;
+ DIR *dp;
+
+ /*
+ * At this point, we are guaranteed to have resctrl FS mounted and if
+ * ctrlgrp == NULL, it means, user wants to use root con_mon grp, so do
+ * nothing
+ */
+ if (!ctrlgrp)
+ return;
+
+ /* Check if requested con_mon grp exists or not */
+ dp = opendir(RESCTRL_PATH);
+ if (dp != NULL) {
+ while ((ep = readdir(dp)) != NULL) {
+ if (strcmp(ep->d_name, ctrlgrp) == 0)
+ found_ctrl_grp = 1;
+ }
+ closedir(dp);
+ } else {
+ CHILD_EXIT("Unable to open resctrlfs for con_mon grp");
+ }
+
+ /* Requested con_mon grp doesn't exist, hence create it */
+ if (found_ctrl_grp == 0) {
+ if (mkdir(controlgroup, 0) == -1)
+ CHILD_EXIT("Unable to create con_mon group");
+ }
+}
+
+/*
+ * create_mon_grp: Create a monitor group *only* if one doesn't exist
+ * @mongrp: Name of the monitor group
+ * @controlgroup: Path of con_mon grp at which the mon grp will be created
+ */
+void create_mon_grp(const char *mongrp, const char *controlgroup)
+{
+ char monitorgroup[1024];
+ int found_mon_grp = 0;
+ struct dirent *ep;
+ DIR *dp;
+
+ /* Check if requested mon grp exists or not */
+ sprintf(monitorgroup, "%s/mon_groups", controlgroup);
+ dp = opendir(monitorgroup);
+ if (dp != NULL) {
+ while ((ep = readdir(dp)) != NULL) {
+ if (strcmp(ep->d_name, mongrp) == 0)
+ found_mon_grp = 1;
+ }
+ closedir(dp);
+ } else {
+ CHILD_EXIT("Unable to open resctrl FS for mon group");
+ }
+
+ /* Requested mon grp doesn't exist, hence create it */
+ sprintf(monitorgroup, "%s/mon_groups/%s", controlgroup, mongrp);
+ if (found_mon_grp == 0) {
+ if (mkdir(monitorgroup, 0) == -1)
+ CHILD_EXIT("Unable to create mon group");
+ }
+}
+
+/*
+ * write_bm_pid_to_resctrl: Write a PID (i.e. benchmark) to resctrl FS
+ * @bm_pid: PID that should be written
+ * @ctrlgrp: Name of the control monitor group (con_mon grp)
+ * @mongrp: Name of the monitor group (mon grp)
+ * @resctrl_val: Resctrl feature (Eg: mbm, mba.. etc)
+ *
+ * If a con_mon grp is requested, create it and write pid to it, otherwise
+ * write pid to root con_mon grp.
+ * If a mon grp is requested, create it and write pid to it, otherwise
+ * pid is not written, this means that pid is in con_mon grp and hence
+ * should consult con_mon grp's mon_data directory for results.
+ */
+void write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,
+ char *resctrl_val)
+{
+ char controlgroup[1024], monitorgroup[1024];
+ FILE *fp;
+
+ if (ctrlgrp)
+ sprintf(controlgroup, "%s/%s", RESCTRL_PATH, ctrlgrp);
+ else
+ sprintf(controlgroup, "%s", RESCTRL_PATH);
+
+ create_con_mon_grp(ctrlgrp, controlgroup);
+
+ /* Create mon grp, only for monitoring features like "mbm" */
+ if ((strcmp(resctrl_val, "mbm") == 0)) {
+ if (mongrp) {
+ create_mon_grp(mongrp, controlgroup);
+ sprintf(monitorgroup, "%s/mon_groups/%s/tasks",
+ controlgroup, mongrp);
+ }
+ }
+
+ strcat(controlgroup, "/tasks");
+
+ /* Write child pid to con_mon grp */
+ fp = fopen(controlgroup, "w");
+ if (!fp || fprintf(fp, "%d\n", bm_pid) <= 0 || fclose(fp) == EOF)
+ CHILD_EXIT("Failed to write child to con_mon grp");
+
+ /* Write child pid to mon grp, only for "mbm" */
+ if ((strcmp(resctrl_val, "mbm") == 0)) {
+ if (mongrp) {
+ fp = fopen(monitorgroup, "w");
+ if (!fp || fprintf(fp, "%d\n", bm_pid) <= 0 ||
+ fclose(fp) == EOF)
+ CHILD_EXIT("Failed to write child to mon grp");
+ }
+ }
+ printf("Write benchmark to resctrl FS: done!\n");
+}
+
+/*
+ * write_schemata: Update schemata of a con_mon grp
+ * @ctrlgrp: Name of the con_mon grp
+ * @schemata: Schemata that should be updated to
+ * @cpu_no: CPU number that the benchmark PID is binded to
+ * @resctrl_val: Resctrl feature (Eg: mbm, mba.. etc)
+ *
+ * Update schemata of a con_mon grp *only* if requested resctrl feature is
+ * allocation type
+ */
+void write_schemata(char *ctrlgrp, char *schemata, int cpu_no,
+ char *resctrl_val)
+{
+ char sock_num, controlgroup[1024], schema[1024];
+ FILE *fp;
+
+ if (strcmp(resctrl_val, "mba") == 0) {
+
+ if (!schemata) {
+ fprintf(stderr, "Schemata empty, so not updating\n");
+ return;
+ }
+ sock_num = get_sock_num(cpu_no);
+ if (ctrlgrp)
+ sprintf(controlgroup, "%s/%s/schemata", RESCTRL_PATH,
+ ctrlgrp);
+ else
+ sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
+ sprintf(schema, "%s%c%c%s", "MB:", sock_num, '=', schemata);
+
+ fp = fopen(controlgroup, "w");
+ if (!fp || fprintf(fp, "%s\n", schema) <= 0 ||
+ fclose(fp) == EOF)
+ CHILD_EXIT("Unable to write schemata to con_mon grp");
+ printf("Write schemata to resctrl FS: done!\n");
+ }
+}
+
+/*
+ * Check if the requested feature is a valid resctrl feature or not.
+ * If yes, check if it's supported by this platform or not.
+ */
+void validate_resctrl_feature_request(char *resctrl_val)
+{
+ const char *resctrl_features_list[MAX_RESCTRL_FEATURES] = {
+ "mbm", "mba"};
+ int resctrl_features_supported[MAX_RESCTRL_FEATURES] = {0, 0};
+ int i, valid_resctrl_feature = -1;
+ char line[1024];
+ FILE *fp;
+
+ if (!resctrl_val)
+ FPRINTF_EXIT("resctrl feature cannot be NULL\n");
+
+ /* Is the resctrl feature request valid? */
+ for (i = 0; i < MAX_RESCTRL_FEATURES; i++) {
+ if (strcmp(resctrl_features_list[i], resctrl_val) == 0)
+ valid_resctrl_feature = i;
+ }
+ if (valid_resctrl_feature == -1)
+ FPRINTF_EXIT("Not a valid resctrl feature request\n");
+
+ /* Enumerate resctrl features supported by this platform */
+ if (system("dmesg > dmesg") != 0)
+ PERR_EXIT("Could not create custom dmesg file");
+
+ fp = fopen("dmesg", "r");
+ if (!fp)
+ PERR_EXIT("Could not read custom created dmesg");
+
+ while (fgets(line, 1024, fp) != NULL) {
+ if ((strstr(line, RESCTRL_MBM)) != NULL)
+ resctrl_features_supported[0] = 1;
+ if ((strstr(line, RESCTRL_MBA)) != NULL)
+ resctrl_features_supported[1] = 1;
+ }
+ if (fclose(fp) == EOF)
+ PERR_EXIT("Error in closing file");
+
+ if (system("rm -rf dmesg") != 0)
+ perror("Unable to remove 'dmesg' file");
+
+ /* Is the resctrl feature request supported? */
+ if (!resctrl_features_supported[valid_resctrl_feature])
+ FPRINTF_EXIT("resctrl feature not supported!");
+}
+
+void validate_bw_report_request(char *bw_report)
+{
+ if (strcmp(bw_report, "reads") == 0)
+ return;
+ if (strcmp(bw_report, "writes") == 0)
+ return;
+ if (strcmp(bw_report, "nt-writes") == 0) {
+ strcpy(bw_report, "writes");
+ return;
+ }
+ if (strcmp(bw_report, "total") == 0)
+ return;
+
+ FPRINTF_EXIT("Requested iMC B/W report type unavailable\n");
+}
+
+int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
+ int group_fd, unsigned long flags)
+{
+ int ret;
+
+ ret = syscall(__NR_perf_event_open, hw_event, pid, cpu,
+ group_fd, flags);
+ return ret;
+}
+
+void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
+{
+ kill(bm_pid, SIGKILL);
+ printf("Ending\n\n");
+
+ exit(EXIT_SUCCESS);
+}
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
new file mode 100644
index 000000000000..1da8f871a01a
--- /dev/null
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#define _GNU_SOURCE
+#ifndef RESCTRL_H
+#define RESCTRL_H
+#include <stdio.h>
+#include <errno.h>
+#include <sched.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <dirent.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <asm/unistd.h>
+#include <linux/perf_event.h>
+
+#define MB (1024 * 1024)
+#define RESCTRL_PATH "/sys/fs/resctrl"
+#define PHYS_ID_PATH "/sys/devices/system/cpu/cpu"
+#define RESCTRL_MBM "L3 monitoring detected"
+#define RESCTRL_MBA "MB allocation detected"
+#define MAX_RESCTRL_FEATURES 2
+#define RM_SIG_FILE "rm -rf sig"
+
+#define CHILD_EXIT(err_msg) \
+ do { \
+ perror(err_msg); \
+ ctrlc_handler(0, NULL, NULL); \
+ } while (0)
+
+#define PARENT_EXIT(err_msg) \
+ do { \
+ perror(err_msg); \
+ kill(ppid, SIGKILL); \
+ exit(EXIT_FAILURE); \
+ } while (0)
+
+#define PERR_EXIT(err_msg) \
+ do { \
+ perror(err_msg); \
+ exit(EXIT_FAILURE); \
+ } while (0)
+
+#define FPRINTF_EXIT(err_msg) \
+ do { \
+ fprintf(stderr, err_msg); \
+ exit(EXIT_FAILURE); \
+ } while (0)
+
+pid_t bm_pid, ppid;
+int ben_count;
+
+void remount_resctrlfs(bool mum_resctrlfs);
+char get_sock_num(int cpu_no);
+void validate_bw_report_request(char *bw_report);
+void validate_resctrl_feature_request(char *resctrl_val);
+void taskset_benchmark(pid_t bm_pid, int cpu_no);
+void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
+void run_benchmark(int signum, siginfo_t *info, void *ucontext);
+void create_mon_grp(const char *mongrp, const char *controlgroup);
+void create_con_mon_grp(const char *ctrlgrp, const char *controlgroup);
+void write_schemata(char *ctrlgrp, char *schemata, int cpu_no,
+ char *resctrl_val);
+void write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,
+ char *resctrl_val);
+int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
+ int group_fd, unsigned long flags);
+int run_fill_buf(int span, int malloc_and_init_memory, int memflush, int op);
+
+#endif /* RESCTRL_H */
--
2.5.0
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