linux/tools/testing/selftests/resctrl/resctrl.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef RESCTRL_H
#define RESCTRL_H
#include <stdio.h>
#include <math.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 <sys/wait.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/eventfd.h>
#include <asm/unistd.h>
#include <linux/perf_event.h>
#include "../kselftest.h"

#define MB			(1024 * 1024)
#define RESCTRL_PATH		"/sys/fs/resctrl"
#define PHYS_ID_PATH		"/sys/devices/system/cpu/cpu"
#define INFO_PATH		"/sys/fs/resctrl/info"

#define ARCH_INTEL     1
#define ARCH_AMD       2

#define END_OF_TESTS	1

#define BENCHMARK_ARGS		64

#define DEFAULT_SPAN		(250 * MB)

#define PARENT_EXIT()				\
	do {					\
		kill(ppid, SIGKILL);		\
		umount_resctrlfs();		\
		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
 * @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;
	char		filename[64];
	char		*bw_report;
	unsigned long	mask;
	int		num_of_runs;
	int		(*setup)(struct resctrl_val_param *param);
};

struct perf_event_read {
	__u64 nr;			/* The number of events */
	struct {
		__u64 value;		/* The value of the event */
	} values[2];
};

#define MBM_STR			"mbm"
#define MBA_STR			"mba"
#define CMT_STR			"cmt"
#define CAT_STR			"cat"

/*
 * Memory location that consumes values compiler must not optimize away.
 * Volatile ensures writes to this location cannot be optimized away by
 * compiler.
 */
extern volatile int *value_sink;

extern pid_t bm_pid, ppid;

extern char llc_occup_path[1024];

int get_vendor(void);
bool check_resctrlfs_support(void);
int filter_dmesg(void);
int get_resource_id(int cpu_no, int *resource_id);
int mount_resctrlfs(void);
int umount_resctrlfs(void);
int validate_bw_report_request(char *bw_report);
bool validate_resctrl_feature_request(const char *resource, const char *feature);
char *fgrep(FILE *inf, const char *str);
int taskset_benchmark(pid_t bm_pid, int cpu_no);
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(size_t buf_size, int memflush, int op, bool once);
int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param);
int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd);
void tests_cleanup(void);
void mbm_test_cleanup(void);
int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd);
void mba_test_cleanup(void);
unsigned long create_bit_mask(unsigned int start, unsigned int len);
int get_full_cbm(const char *cache_type, unsigned long *mask);
int get_mask_no_shareable(const char *cache_type, unsigned long *mask);
int get_cache_size(int cpu_no, const char *cache_type, unsigned long *cache_size);
void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
int signal_handler_register(void);
void signal_handler_unregister(void);
void cat_test_cleanup(void);
int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type);
int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd);
unsigned int count_bits(unsigned long n);
void cmt_test_cleanup(void);
int get_core_sibling(int cpu_no);

void perf_event_attr_initialize(struct perf_event_attr *pea, __u64 config);
void perf_event_initialize_read_format(struct perf_event_read *pe_read);
int perf_open(struct perf_event_attr *pea, pid_t pid, int cpu_no);
int perf_event_reset_enable(int pe_fd);
int perf_event_measure(int pe_fd, struct perf_event_read *pe_read,
		       const char *filename, int bm_pid);
int measure_llc_resctrl(const char *filename, int bm_pid);
void show_cache_info(int no_of_bits, __u64 avg_llc_val, size_t cache_span, bool lines);

/*
 * cache_portion_size - Calculate the size of a cache portion
 * @cache_size:		Total cache size in bytes
 * @portion_mask:	Cache portion mask
 * @full_cache_mask:	Full Cache Bit Mask (CBM) for the cache
 *
 * Return: The size of the cache portion in bytes.
 */
static inline unsigned long cache_portion_size(unsigned long cache_size,
					       unsigned long portion_mask,
					       unsigned long full_cache_mask)
{
	unsigned int bits = count_bits(full_cache_mask);

	/*
	 * With no bits the full CBM, assume cache cannot be split into
	 * smaller portions. To avoid divide by zero, return cache_size.
	 */
	if (!bits)
		return cache_size;

	return cache_size * count_bits(portion_mask) / bits;
}

#endif /* RESCTRL_H */