selftests/resctrl: Add callback to start a benchmark

The callback starts a child process and puts the child pid in created
resctrl group with specified memory bandwidth in schemata. The child
starts running benchmark.
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Co-developed-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/resctrl/resctrl.h

@@ -3,6 +3,8 @@
 #ifndef RESCTRL_H
 #define RESCTRL_H
 #include <stdio.h>
+#include <stdarg.h>
+#include <math.h>
 #include <errno.h>
 #include <sched.h>
 #include <stdlib.h>
@@ -19,6 +21,7 @@
 #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"
 
@@ -29,10 +32,35 @@
 		exit(EXIT_FAILURE);		\
 	} while (0)
 
+/*
+ * resctrl_val_param:	resctrl test parameters
+ * @resctrl_val:	Resctrl feature (Eg: mbm, mba.. etc)
+ * @ctrlgrp:		Name of the control monitor group (con_mon grp)
+ * @mongrp:		Name of the monitor group (mon grp)
+ * @cpu_no:		CPU number to which the benchmark would be binded
+ * @span:		Memory bytes accessed in each benchmark iteration
+ * @mum_resctrlfs:	Should the resctrl FS be remounted?
+ * @filename:		Name of file to which the o/p should be written
+ * @bw_report:		Bandwidth report type (reads vs writes)
+ * @setup:		Call back function to setup test environment
+ */
+struct resctrl_val_param {
+	char		*resctrl_val;
+	char		ctrlgrp[64];
+	char		mongrp[64];
+	int		cpu_no;
+	unsigned long	span;
+	int		mum_resctrlfs;
+	char		filename[64];
+	char		*bw_report;
+	int		(*setup)(int num, ...);
+};
+
 pid_t bm_pid, ppid;
 
 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);
 char *fgrep(FILE *inf, const char *str);
@@ -46,5 +74,6 @@ 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);
+int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param);
 
 #endif /* RESCTRL_H */