[mirror_ubuntu-artful-kernel.git] / samples / bpf / tracex6_user.c

#define _GNU_SOURCE

#include <assert.h>
#include <fcntl.h>
#include <linux/perf_event.h>
#include <linux/bpf.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include "bpf_load.h"
#include "libbpf.h"
#include "perf-sys.h"

#define SAMPLE_PERIOD  0x7fffffffffffffffULL

static void check_on_cpu(int cpu, struct perf_event_attr *attr)
{
	int pmu_fd, error = 0;
	cpu_set_t set;
	__u64 value;

	/* Move to target CPU */
	CPU_ZERO(&set);
	CPU_SET(cpu, &set);
	assert(sched_setaffinity(0, sizeof(set), &set) == 0);
	/* Open perf event and attach to the perf_event_array */
	pmu_fd = sys_perf_event_open(attr, -1/*pid*/, cpu/*cpu*/, -1/*group_fd*/, 0);
	if (pmu_fd < 0) {
		fprintf(stderr, "sys_perf_event_open failed on CPU %d\n", cpu);
		error = 1;
		goto on_exit;
	}
	assert(bpf_map_update_elem(map_fd[0], &cpu, &pmu_fd, BPF_ANY) == 0);
	assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0) == 0);
	/* Trigger the kprobe */
	bpf_map_get_next_key(map_fd[1], &cpu, NULL);
	/* Check the value */
	if (bpf_map_lookup_elem(map_fd[1], &cpu, &value)) {
		fprintf(stderr, "Value missing for CPU %d\n", cpu);
		error = 1;
		goto on_exit;
	}
	fprintf(stderr, "CPU %d: %llu\n", cpu, value);

on_exit:
	assert(bpf_map_delete_elem(map_fd[0], &cpu) == 0 || error);
	assert(ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE, 0) == 0 || error);
	assert(close(pmu_fd) == 0 || error);
	assert(bpf_map_delete_elem(map_fd[1], &cpu) == 0 || error);
	exit(error);
}

static void test_perf_event_array(struct perf_event_attr *attr,
				  const char *name)
{
	int i, status, nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
	pid_t pid[nr_cpus];
	int err = 0;

	printf("Test reading %s counters\n", name);

	for (i = 0; i < nr_cpus; i++) {
		pid[i] = fork();
		assert(pid[i] >= 0);
		if (pid[i] == 0) {
			check_on_cpu(i, attr);
			exit(1);
		}
	}

	for (i = 0; i < nr_cpus; i++) {
		assert(waitpid(pid[i], &status, 0) == pid[i]);
		err |= status;
	}

	if (err)
		printf("Test: %s FAILED\n", name);
}

static void test_bpf_perf_event(void)
{
	struct perf_event_attr attr_cycles = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_HARDWARE,
		.read_format = 0,
		.sample_type = 0,
		.config = PERF_COUNT_HW_CPU_CYCLES,
	};
	struct perf_event_attr attr_clock = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_SOFTWARE,
		.read_format = 0,
		.sample_type = 0,
		.config = PERF_COUNT_SW_CPU_CLOCK,
	};
	struct perf_event_attr attr_raw = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_RAW,
		.read_format = 0,
		.sample_type = 0,
		/* Intel Instruction Retired */
		.config = 0xc0,
	};
	struct perf_event_attr attr_l1d_load = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_HW_CACHE,
		.read_format = 0,
		.sample_type = 0,
		.config =
			PERF_COUNT_HW_CACHE_L1D |
			(PERF_COUNT_HW_CACHE_OP_READ << 8) |
			(PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
	};
	struct perf_event_attr attr_llc_miss = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_HW_CACHE,
		.read_format = 0,
		.sample_type = 0,
		.config =
			PERF_COUNT_HW_CACHE_LL |
			(PERF_COUNT_HW_CACHE_OP_READ << 8) |
			(PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
	};
	struct perf_event_attr attr_msr_tsc = {
		.freq = 0,
		.sample_period = 0,
		.inherit = 0,
		/* From /sys/bus/event_source/devices/msr/ */
		.type = 7,
		.read_format = 0,
		.sample_type = 0,
		.config = 0,
	};

	test_perf_event_array(&attr_cycles, "HARDWARE-cycles");
	test_perf_event_array(&attr_clock, "SOFTWARE-clock");
	test_perf_event_array(&attr_raw, "RAW-instruction-retired");
	test_perf_event_array(&attr_l1d_load, "HW_CACHE-L1D-load");

	/* below tests may fail in qemu */
	test_perf_event_array(&attr_llc_miss, "HW_CACHE-LLC-miss");
	test_perf_event_array(&attr_msr_tsc, "Dynamic-msr-tsc");
}

int main(int argc, char **argv)
{
	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
	char filename[256];

	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

	setrlimit(RLIMIT_MEMLOCK, &r);
	if (load_bpf_file(filename)) {
		printf("%s", bpf_log_buf);
		return 1;
	}

	test_bpf_perf_event();
	return 0;
}
Commit	Line	Data
41e9a804 TQ	1	#define _GNU_SOURCE
	2
	3	#include <assert.h>
47efb302	4	#include <fcntl.h>
47efb302 KX	5	#include <linux/perf_event.h>
47efb302 KX	6	#include <linux/bpf.h>
41e9a804 TQ	7	#include <sched.h>
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <sys/ioctl.h>
	11	#include <sys/resource.h>
	12	#include <sys/time.h>
	13	#include <sys/types.h>
	14	#include <sys/wait.h>
	15	#include <unistd.h>
	16
47efb302	17	#include "bpf_load.h"
41e9a804	18	#include "libbpf.h"
205c8ada	19	#include "perf-sys.h"
47efb302 KX	20
	21	#define SAMPLE_PERIOD 0x7fffffffffffffffULL
	22
41e9a804	23	static void check_on_cpu(int cpu, struct perf_event_attr *attr)
47efb302	24	{
41e9a804 TQ	25	int pmu_fd, error = 0;
	26	cpu_set_t set;
	27	__u64 value;
47efb302	28
41e9a804 TQ	29	/* Move to target CPU */
	30	CPU_ZERO(&set);
	31	CPU_SET(cpu, &set);
	32	assert(sched_setaffinity(0, sizeof(set), &set) == 0);
	33	/* Open perf event and attach to the perf_event_array */
	34	pmu_fd = sys_perf_event_open(attr, -1/pid/, cpu/cpu/, -1/group_fd/, 0);
	35	if (pmu_fd < 0) {
	36	fprintf(stderr, "sys_perf_event_open failed on CPU %d\n", cpu);
	37	error = 1;
	38	goto on_exit;
	39	}
	40	assert(bpf_map_update_elem(map_fd[0], &cpu, &pmu_fd, BPF_ANY) == 0);
	41	assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0) == 0);
	42	/* Trigger the kprobe */
	43	bpf_map_get_next_key(map_fd[1], &cpu, NULL);
	44	/* Check the value */
	45	if (bpf_map_lookup_elem(map_fd[1], &cpu, &value)) {
	46	fprintf(stderr, "Value missing for CPU %d\n", cpu);
	47	error = 1;
	48	goto on_exit;
	49	}
	50	fprintf(stderr, "CPU %d: %llu\n", cpu, value);
	51
	52	on_exit:
	53	assert(bpf_map_delete_elem(map_fd[0], &cpu) == 0 \|\| error);
	54	assert(ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE, 0) == 0 \|\| error);
	55	assert(close(pmu_fd) == 0 \|\| error);
	56	assert(bpf_map_delete_elem(map_fd[1], &cpu) == 0 \|\| error);
	57	exit(error);
	58	}
	59
	60	static void test_perf_event_array(struct perf_event_attr *attr,
	61	const char *name)
	62	{
	63	int i, status, nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
	64	pid_t pid[nr_cpus];
	65	int err = 0;
	66
	67	printf("Test reading %s counters\n", name);
	68
	69	for (i = 0; i < nr_cpus; i++) {
	70	pid[i] = fork();
	71	assert(pid[i] >= 0);
	72	if (pid[i] == 0) {
	73	check_on_cpu(i, attr);
	74	exit(1);
	75	}
	76	}
	77
	78	for (i = 0; i < nr_cpus; i++) {
	79	assert(waitpid(pid[i], &status, 0) == pid[i]);
	80	err \|= status;
	81	}
	82
	83	if (err)
	84	printf("Test: %s FAILED\n", name);
	85	}
	86
	87	static void test_bpf_perf_event(void)
	88	{
	89	struct perf_event_attr attr_cycles = {
47efb302 KX	90	.freq = 0,
	91	.sample_period = SAMPLE_PERIOD,
	92	.inherit = 0,
	93	.type = PERF_TYPE_HARDWARE,
	94	.read_format = 0,
	95	.sample_type = 0,
41e9a804 TQ	96	.config = PERF_COUNT_HW_CPU_CYCLES,
	97	};
	98	struct perf_event_attr attr_clock = {
	99	.freq = 0,
	100	.sample_period = SAMPLE_PERIOD,
	101	.inherit = 0,
	102	.type = PERF_TYPE_SOFTWARE,
	103	.read_format = 0,
	104	.sample_type = 0,
	105	.config = PERF_COUNT_SW_CPU_CLOCK,
	106	};
	107	struct perf_event_attr attr_raw = {
	108	.freq = 0,
	109	.sample_period = SAMPLE_PERIOD,
	110	.inherit = 0,
	111	.type = PERF_TYPE_RAW,
	112	.read_format = 0,
	113	.sample_type = 0,
	114	/* Intel Instruction Retired */
	115	.config = 0xc0,
	116	};
	117	struct perf_event_attr attr_l1d_load = {
	118	.freq = 0,
	119	.sample_period = SAMPLE_PERIOD,
	120	.inherit = 0,
	121	.type = PERF_TYPE_HW_CACHE,
	122	.read_format = 0,
	123	.sample_type = 0,
	124	.config =
	125	PERF_COUNT_HW_CACHE_L1D \|
	126	(PERF_COUNT_HW_CACHE_OP_READ << 8) \|
	127	(PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
	128	};
	129	struct perf_event_attr attr_llc_miss = {
	130	.freq = 0,
	131	.sample_period = SAMPLE_PERIOD,
	132	.inherit = 0,
	133	.type = PERF_TYPE_HW_CACHE,
	134	.read_format = 0,
	135	.sample_type = 0,
	136	.config =
	137	PERF_COUNT_HW_CACHE_LL \|
	138	(PERF_COUNT_HW_CACHE_OP_READ << 8) \|
	139	(PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
	140	};
	141	struct perf_event_attr attr_msr_tsc = {
	142	.freq = 0,
	143	.sample_period = 0,
	144	.inherit = 0,
	145	/* From /sys/bus/event_source/devices/msr/ */
	146	.type = 7,
	147	.read_format = 0,
	148	.sample_type = 0,
	149	.config = 0,
47efb302 KX	150	};
47efb302 KX	151
41e9a804 TQ	152	test_perf_event_array(&attr_cycles, "HARDWARE-cycles");
	153	test_perf_event_array(&attr_clock, "SOFTWARE-clock");
	154	test_perf_event_array(&attr_raw, "RAW-instruction-retired");
	155	test_perf_event_array(&attr_l1d_load, "HW_CACHE-L1D-load");
47efb302	156
41e9a804 TQ	157	/* below tests may fail in qemu */
	158	test_perf_event_array(&attr_llc_miss, "HW_CACHE-LLC-miss");
	159	test_perf_event_array(&attr_msr_tsc, "Dynamic-msr-tsc");
47efb302 KX	160	}
	161
	162	int main(int argc, char **argv)
	163	{
41e9a804	164	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
47efb302 KX	165	char filename[256];
	166
	167	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
	168
41e9a804	169	setrlimit(RLIMIT_MEMLOCK, &r);
47efb302 KX	170	if (load_bpf_file(filename)) {
	171	printf("%s", bpf_log_buf);
	172	return 1;
	173	}
	174
	175	test_bpf_perf_event();
47efb302 KX	176	return 0;
47efb302 KX	177	}