1
  2/*
  3 * The struct perf_event_attr test support.
  4 *
  5 * This test is embedded inside into perf directly and is governed
  6 * by the PERF_TEST_ATTR environment variable and hook inside
  7 * sys_perf_event_open function.
  8 *
  9 * The general idea is to store 'struct perf_event_attr' details for
 10 * each event created within single perf command. Each event details
 11 * are stored into separate text file. Once perf command is finished
 12 * these files can be checked for values we expect for command.
 13 *
 14 * Besides 'struct perf_event_attr' values we also store 'fd' and
 15 * 'group_fd' values to allow checking for groups created.
 16 *
 17 * This all is triggered by setting PERF_TEST_ATTR environment variable.
 18 * It must contain name of existing directory with access and write
 19 * permissions. All the event text files are stored there.
 20 */
 21
 22/*
 23 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
 24 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
 25 */
 26#define __SANE_USERSPACE_TYPES__
 27#include <stdlib.h>
 28#include <stdio.h>
 29#include <inttypes.h>
 30#include <linux/types.h>
 31#include <linux/kernel.h>
 32#include "../perf.h"
 33#include "util.h"
 34#include "exec_cmd.h"
 35#include "tests.h"
 36
 37#define ENV "PERF_TEST_ATTR"
 38
 39extern int verbose;
 40
 41static char *dir;
 42
 43void test_attr__init(void)
 44{
 45	dir = getenv(ENV);
 46	test_attr__enabled = (dir != NULL);
 47}
 48
 49#define BUFSIZE 1024
 50
 51#define __WRITE_ASS(str, fmt, data)					\
 52do {									\
 53	char buf[BUFSIZE];						\
 54	size_t size;							\
 55									\
 56	size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data);		\
 57	if (1 != fwrite(buf, size, 1, file)) {				\
 58		perror("test attr - failed to write event file");	\
 59		fclose(file);						\
 60		return -1;						\
 61	}								\
 62									\
 63} while (0)
 64
 65#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
 66
 67static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
 68		       int fd, int group_fd, unsigned long flags)
 69{
 70	FILE *file;
 71	char path[PATH_MAX];
 72
 73	snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
 74		 attr->type, attr->config, fd);
 75
 76	file = fopen(path, "w+");
 77	if (!file) {
 78		perror("test attr - failed to open event file");
 79		return -1;
 80	}
 81
 82	if (fprintf(file, "[event-%d-%llu-%d]\n",
 83		    attr->type, attr->config, fd) < 0) {
 84		perror("test attr - failed to write event file");
 85		fclose(file);
 86		return -1;
 87	}
 88
 89	/* syscall arguments */
 90	__WRITE_ASS(fd,       "d", fd);
 91	__WRITE_ASS(group_fd, "d", group_fd);
 92	__WRITE_ASS(cpu,      "d", cpu);
 93	__WRITE_ASS(pid,      "d", pid);
 94	__WRITE_ASS(flags,   "lu", flags);
 95
 96	/* struct perf_event_attr */
 97	WRITE_ASS(type,   PRIu32);
 98	WRITE_ASS(size,   PRIu32);
 99	WRITE_ASS(config,  "llu");
100	WRITE_ASS(sample_period, "llu");
101	WRITE_ASS(sample_type,   "llu");
102	WRITE_ASS(read_format,   "llu");
103	WRITE_ASS(disabled,       "d");
104	WRITE_ASS(inherit,        "d");
105	WRITE_ASS(pinned,         "d");
106	WRITE_ASS(exclusive,      "d");
107	WRITE_ASS(exclude_user,   "d");
108	WRITE_ASS(exclude_kernel, "d");
109	WRITE_ASS(exclude_hv,     "d");
110	WRITE_ASS(exclude_idle,   "d");
111	WRITE_ASS(mmap,           "d");
112	WRITE_ASS(comm,           "d");
113	WRITE_ASS(freq,           "d");
114	WRITE_ASS(inherit_stat,   "d");
115	WRITE_ASS(enable_on_exec, "d");
116	WRITE_ASS(task,           "d");
117	WRITE_ASS(watermark,      "d");
118	WRITE_ASS(precise_ip,     "d");
119	WRITE_ASS(mmap_data,      "d");
120	WRITE_ASS(sample_id_all,  "d");
121	WRITE_ASS(exclude_host,   "d");
122	WRITE_ASS(exclude_guest,  "d");
123	WRITE_ASS(exclude_callchain_kernel, "d");
124	WRITE_ASS(exclude_callchain_user, "d");
125	WRITE_ASS(wakeup_events, PRIu32);
126	WRITE_ASS(bp_type, PRIu32);
127	WRITE_ASS(config1, "llu");
128	WRITE_ASS(config2, "llu");
129	WRITE_ASS(branch_sample_type, "llu");
130	WRITE_ASS(sample_regs_user,   "llu");
131	WRITE_ASS(sample_stack_user,  PRIu32);
132
133	fclose(file);
134	return 0;
135}
136
137void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
138		     int fd, int group_fd, unsigned long flags)
139{
140	int errno_saved = errno;
141
142	if (store_event(attr, pid, cpu, fd, group_fd, flags))
143		die("test attr FAILED");
144
145	errno = errno_saved;
146}
147
148static int run_dir(const char *d, const char *perf)
149{
150	char v[] = "-vvvvv";
151	int vcnt = min(verbose, (int) sizeof(v) - 1);
152	char cmd[3*PATH_MAX];
153
154	if (verbose)
155		vcnt++;
156
157	snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
158		 d, d, perf, vcnt, v);
159
160	return system(cmd);
161}
162
163int test__attr(void)
164{
165	struct stat st;
166	char path_perf[PATH_MAX];
167	char path_dir[PATH_MAX];
168
169	/* First try developement tree tests. */
170	if (!lstat("./tests", &st))
171		return run_dir("./tests", "./perf");
172
173	/* Then installed path. */
174	snprintf(path_dir,  PATH_MAX, "%s/tests", perf_exec_path());
175	snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
176
177	if (!lstat(path_dir, &st) &&
178	    !lstat(path_perf, &st))
179		return run_dir(path_dir, path_perf);
180
181	fprintf(stderr, " (omitted)");
182	return 0;
183}