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Subject[PATCH v7 02/13] 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>
Signed-off-by: Babu Moger <babu.moger@amd.com>
---
tools/testing/selftests/resctrl/Makefile | 10 +
tools/testing/selftests/resctrl/resctrl.h | 48 +++
tools/testing/selftests/resctrl/resctrlfs.c | 464 ++++++++++++++++++++++++++++
3 files changed, 522 insertions(+)
create mode 100644 tools/testing/selftests/resctrl/Makefile
create mode 100644 tools/testing/selftests/resctrl/resctrl.h
create mode 100644 tools/testing/selftests/resctrl/resctrlfs.c

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.h b/tools/testing/selftests/resctrl/resctrl.h
new file mode 100644
index 000000000000..2e112934d48a
--- /dev/null
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -0,0 +1,48 @@
+/* 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 RESCTRL_PATH "/sys/fs/resctrl"
+#define PHYS_ID_PATH "/sys/devices/system/cpu/cpu"
+
+#define PARENT_EXIT(err_msg) \
+ do { \
+ perror(err_msg); \
+ kill(ppid, SIGKILL); \
+ exit(EXIT_FAILURE); \
+ } while (0)
+
+pid_t bm_pid, ppid;
+
+int remount_resctrlfs(bool mum_resctrlfs);
+int get_resource_id(int cpu_no, int *resource_id);
+int validate_bw_report_request(char *bw_report);
+int validate_resctrl_feature_request(char *resctrl_val);
+int taskset_benchmark(pid_t bm_pid, int cpu_no);
+void run_benchmark(int signum, siginfo_t *info, void *ucontext);
+int write_schemata(char *ctrlgrp, char *schemata, int cpu_no,
+ char *resctrl_val);
+int 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(unsigned long span, int malloc_and_init_memory, int memflush,
+ int op, char *resctrl_va);
+
+#endif /* RESCTRL_H */
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
new file mode 100644
index 000000000000..5afcaa89f418
--- /dev/null
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -0,0 +1,464 @@
+// 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"
+
+#define RESCTRL_MBM "L3 monitoring detected"
+#define RESCTRL_MBA "MB allocation detected"
+enum {
+ RESCTRL_FEATURE_MBM,
+ RESCTRL_FEATURE_MBA,
+ MAX_RESCTRL_FEATURES
+};
+
+/*
+ * 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
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+int 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) {
+ while ((ep = readdir(dp)) != NULL)
+ count++;
+ closedir(dp);
+ } else {
+ perror("Unable to read /sys/fs/resctrl");
+
+ return -1;
+ }
+
+ /*
+ * 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) {
+ perror("Unable to umount resctrl");
+
+ return errno;
+ }
+ printf("Remount: done!\n");
+ } else {
+ printf("Mounted already. Not remounting!\n");
+
+ return 0;
+ }
+ }
+
+ if (mount("resctrl", RESCTRL_PATH, "resctrl", 0, NULL) != 0) {
+ perror("Unable to mount resctrl FS at /sys/fs/resctrl");
+
+ return errno;
+ }
+
+ return 0;
+}
+
+int umount_resctrlfs(void)
+{
+ if (umount(RESCTRL_PATH)) {
+ perror("Unable to umount resctrl");
+
+ return errno;
+ }
+
+ return 0;
+}
+
+/*
+ * get_resource_id - Get socket number/l3 id for a specified CPU
+ * @cpu_no: CPU number
+ * @resource_id: Socket number or l3_id
+ *
+ * Return: >= 0 on success, < 0 on failure.
+ */
+int get_resource_id(int cpu_no, int *resource_id)
+{
+ char 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) {
+ perror("Failed to open physical_package_id");
+
+ return -1;
+ }
+ if (fscanf(fp, "%d", resource_id) <= 0) {
+ perror("Could not get socket number or l3 id");
+ fclose(fp);
+
+ return -1;
+ }
+ fclose(fp);
+
+ return 0;
+}
+
+/*
+ * 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
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+int 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)) {
+ perror("Unable to taskset benchmark");
+
+ return -1;
+ }
+
+ printf("Taskset benchmark: done!\n");
+
+ return 0;
+}
+
+/*
+ * run_benchmark - Run a specified benchmark or fill_buf (default benchmark)
+ * in specified signal. Direct benchmark stdio to /dev/null.
+ * @signum: signal number
+ * @info: signal info
+ * @ucontext: user context in signal handling
+ *
+ * Return: void
+ */
+void run_benchmark(int signum, siginfo_t *info, void *ucontext)
+{
+ unsigned long long span;
+ int operation, ret;
+ char **benchmark_cmd;
+ FILE *fp;
+
+ benchmark_cmd = info->si_ptr;
+
+ /*
+ * Direct stdio of child to /dev/null, so that only parent writes to
+ * stdio (console)
+ */
+ fp = freopen("/dev/null", "w", stdout);
+ if (!fp)
+ PARENT_EXIT("Unable to direct benchmark status to /dev/null");
+
+ if (strcmp(benchmark_cmd[0], "fill_buf") == 0) {
+ /* Execute default fill_buf benchmark */
+ span = strtoul(benchmark_cmd[1], NULL, 10);
+ operation = atoi(benchmark_cmd[4]);
+ if (run_fill_buf(span, 1, 1, operation, NULL))
+ fprintf(stderr, "Error in running fill buffer\n");
+ } else {
+ /* Execute specified benchmark */
+ ret = execvp(benchmark_cmd[0], benchmark_cmd);
+ if (ret)
+ perror("wrong\n");
+ }
+
+ fclose(stdout);
+ PARENT_EXIT("Unable to run specified benchmark");
+}
+
+/*
+ * create_grp - Create a group only if one doesn't exist
+ * @grp_name: Name of the group
+ * @grp: Full path and name of the group
+ * @parent_grp: Full path and name of the parent group
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+static int create_grp(const char *grp_name, char *grp, const char *parent_grp)
+{
+ int found_grp = 0;
+ struct dirent *ep;
+ DIR *dp;
+
+ /* Check if requested grp exists or not */
+ dp = opendir(parent_grp);
+ if (dp) {
+ while ((ep = readdir(dp)) != NULL) {
+ if (strcmp(ep->d_name, grp_name) == 0)
+ found_grp = 1;
+ }
+ closedir(dp);
+ } else {
+ perror("Unable to open resctrl for group");
+
+ return -1;
+ }
+
+ /* Requested grp doesn't exist, hence create it */
+ if (found_grp == 0) {
+ if (mkdir(grp, 0) == -1) {
+ perror("Unable to create group");
+
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int write_pid_to_tasks(char *tasks, pid_t pid)
+{
+ FILE *fp;
+
+ fp = fopen(tasks, "w");
+ if (!fp) {
+ perror("Failed to open tasks file");
+
+ return -1;
+ }
+ if (fprintf(fp, "%d\n", pid) < 0) {
+ perror("Failed to wr pid to tasks file");
+ fclose(fp);
+
+ return -1;
+ }
+ fclose(fp);
+
+ return 0;
+}
+
+/*
+ * 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.
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,
+ char *resctrl_val)
+{
+ char controlgroup[256], monitorgroup[256], monitorgroup_p[256];
+ char tasks[256];
+ int ret;
+
+ if (ctrlgrp)
+ sprintf(controlgroup, "%s/%s", RESCTRL_PATH, ctrlgrp);
+ else
+ sprintf(controlgroup, "%s", RESCTRL_PATH);
+
+ /* Create control and monitoring group and write pid into it */
+ ret = create_grp(ctrlgrp, controlgroup, RESCTRL_PATH);
+ if (ret)
+ return ret;
+ sprintf(tasks, "%s/tasks", controlgroup);
+ ret = write_pid_to_tasks(tasks, bm_pid);
+ if (ret)
+ return ret;
+
+ /* Create mon grp and write pid into it for "mbm" test */
+ if ((strcmp(resctrl_val, "mbm") == 0)) {
+ if (mongrp) {
+ sprintf(monitorgroup_p, "%s/mon_groups", controlgroup);
+ sprintf(monitorgroup, "%s/%s", monitorgroup_p, mongrp);
+ ret = create_grp(mongrp, monitorgroup, monitorgroup_p);
+ if (ret)
+ return ret;
+
+ sprintf(tasks, "%s/mon_groups/%s/tasks",
+ controlgroup, mongrp);
+ ret = write_pid_to_tasks(tasks, bm_pid);
+ if (ret)
+ return ret;
+ }
+ }
+
+ printf("Write benchmark to resctrl FS: done!\n");
+
+ return 0;
+}
+
+/*
+ * 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
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)
+{
+ char controlgroup[1024], schema[1024];
+ int resource_id;
+ FILE *fp;
+
+ if (strcmp(resctrl_val, "mba") == 0) {
+ if (!schemata) {
+ printf("Schemata empty, so not updating\n");
+
+ return 0;
+ }
+ if (get_resource_id(cpu_no, &resource_id) < 0) {
+ perror("Failed to get resource id");
+ return -1;
+ }
+
+ if (ctrlgrp)
+ sprintf(controlgroup, "%s/%s/schemata", RESCTRL_PATH,
+ ctrlgrp);
+ else
+ sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
+ sprintf(schema, "%s%d%c%s", "MB:", resource_id, '=', schemata);
+
+ fp = fopen(controlgroup, "w");
+ if (!fp) {
+ perror("Failed to open control group");
+
+ return -1;
+ }
+
+ if (fprintf(fp, "%s\n", schema) < 0) {
+ perror("Failed to write schemata in control group");
+ fclose(fp);
+
+ return -1;
+ }
+ fclose(fp);
+
+ printf("Write schemata to resctrl FS: done!\n");
+ }
+
+ return 0;
+}
+
+/*
+ * validate_resctrl_feature_request - Check if requested feature is valid.
+ * @resctrl_val: Requested feature
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+int validate_resctrl_feature_request(char *resctrl_val)
+{
+ int resctrl_features_supported[MAX_RESCTRL_FEATURES];
+ const char *resctrl_features_list[MAX_RESCTRL_FEATURES] = {
+ "mbm", "mba"};
+ int i, valid_resctrl_feature = -1;
+ char line[1024];
+ FILE *fp;
+
+ if (!resctrl_val) {
+ fprintf(stderr, "resctrl feature cannot be NULL\n");
+
+ return -1;
+ }
+
+ for (i = 0; i < MAX_RESCTRL_FEATURES; i++)
+ resctrl_features_supported[i] = 0;
+
+ /* 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(stderr, "Not a valid resctrl feature request\n");
+
+ return -1;
+ }
+
+ /* Enumerate resctrl features supported by this platform */
+ if (system("dmesg > dmesg") != 0) {
+ perror("Could not create custom dmesg file");
+
+ return -1;
+ }
+
+ fp = fopen("dmesg", "r");
+ if (!fp) {
+ perror("Could not read custom created dmesg");
+
+ return -1;
+ }
+
+ while (fgets(line, 1024, fp)) {
+ if ((strstr(line, RESCTRL_MBM)) != NULL)
+ resctrl_features_supported[RESCTRL_FEATURE_MBM] = 1;
+ if ((strstr(line, RESCTRL_MBA)) != NULL)
+ resctrl_features_supported[RESCTRL_FEATURE_MBA] = 1;
+ }
+ fclose(fp);
+
+ 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(stderr, "resctrl feature not supported!");
+
+ return -1;
+ }
+
+ return 0;
+}
+
+int validate_bw_report_request(char *bw_report)
+{
+ if (strcmp(bw_report, "reads") == 0)
+ return 0;
+ if (strcmp(bw_report, "writes") == 0)
+ return 0;
+ if (strcmp(bw_report, "nt-writes") == 0) {
+ strcpy(bw_report, "writes");
+ return 0;
+ }
+ if (strcmp(bw_report, "total") == 0)
+ return 0;
+
+ fprintf(stderr, "Requested iMC B/W report type unavailable\n");
+
+ return -1;
+}
+
+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;
+}
--
2.7.4
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