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  1// SPDX-License-Identifier: GPL-2.0
  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#include <debug.h>
 23#include <errno.h>
 24#include <inttypes.h>
 25#include <stdlib.h>
 26#include <stdio.h>
 27#include <linux/types.h>
 28#include <linux/kernel.h>
 29#include <sys/param.h>
 30#include <sys/types.h>
 31#include <sys/stat.h>
 32#include <unistd.h>
 33#include "../perf.h"
 34#include <subcmd/exec-cmd.h>
 35#include "tests.h"
 36
 37#define ENV "PERF_TEST_ATTR"
 38
 39static char *dir;
 40static bool ready;
 41
 42void test_attr__init(void)
 43{
 44	dir = getenv(ENV);
 45	test_attr__enabled = (dir != NULL);
 46}
 47
 48#define BUFSIZE 1024
 49
 50#define __WRITE_ASS(str, fmt, data)					\
 51do {									\
 52	char buf[BUFSIZE];						\
 53	size_t size;							\
 54									\
 55	size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data);		\
 56	if (1 != fwrite(buf, size, 1, file)) {				\
 57		perror("test attr - failed to write event file");	\
 58		fclose(file);						\
 59		return -1;						\
 60	}								\
 61									\
 62} while (0)
 63
 64#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
 65
 66static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
 67		       int fd, int group_fd, unsigned long flags)
 68{
 69	FILE *file;
 70	char path[PATH_MAX];
 71
 72	if (!ready)
 73		return 0;
 74
 75	snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
 76		 attr->type, attr->config, fd);
 77
 78	file = fopen(path, "w+");
 79	if (!file) {
 80		perror("test attr - failed to open event file");
 81		return -1;
 82	}
 83
 84	if (fprintf(file, "[event-%d-%llu-%d]\n",
 85		    attr->type, attr->config, fd) < 0) {
 86		perror("test attr - failed to write event file");
 87		fclose(file);
 88		return -1;
 89	}
 90
 91	/* syscall arguments */
 92	__WRITE_ASS(fd,       "d", fd);
 93	__WRITE_ASS(group_fd, "d", group_fd);
 94	__WRITE_ASS(cpu,      "d", cpu);
 95	__WRITE_ASS(pid,      "d", pid);
 96	__WRITE_ASS(flags,   "lu", flags);
 97
 98	/* struct perf_event_attr */
 99	WRITE_ASS(type,   PRIu32);
100	WRITE_ASS(size,   PRIu32);
101	WRITE_ASS(config,  "llu");
102	WRITE_ASS(sample_period, "llu");
103	WRITE_ASS(sample_type,   "llu");
104	WRITE_ASS(read_format,   "llu");
105	WRITE_ASS(disabled,       "d");
106	WRITE_ASS(inherit,        "d");
107	WRITE_ASS(pinned,         "d");
108	WRITE_ASS(exclusive,      "d");
109	WRITE_ASS(exclude_user,   "d");
110	WRITE_ASS(exclude_kernel, "d");
111	WRITE_ASS(exclude_hv,     "d");
112	WRITE_ASS(exclude_idle,   "d");
113	WRITE_ASS(mmap,           "d");
114	WRITE_ASS(comm,           "d");
115	WRITE_ASS(freq,           "d");
116	WRITE_ASS(inherit_stat,   "d");
117	WRITE_ASS(enable_on_exec, "d");
118	WRITE_ASS(task,           "d");
119	WRITE_ASS(watermark,      "d");
120	WRITE_ASS(precise_ip,     "d");
121	WRITE_ASS(mmap_data,      "d");
122	WRITE_ASS(sample_id_all,  "d");
123	WRITE_ASS(exclude_host,   "d");
124	WRITE_ASS(exclude_guest,  "d");
125	WRITE_ASS(exclude_callchain_kernel, "d");
126	WRITE_ASS(exclude_callchain_user, "d");
127	WRITE_ASS(mmap2,	  "d");
128	WRITE_ASS(comm_exec,	  "d");
129	WRITE_ASS(context_switch, "d");
130	WRITE_ASS(write_backward, "d");
131	WRITE_ASS(namespaces,	  "d");
132	WRITE_ASS(use_clockid,    "d");
133	WRITE_ASS(wakeup_events, PRIu32);
134	WRITE_ASS(bp_type, PRIu32);
135	WRITE_ASS(config1, "llu");
136	WRITE_ASS(config2, "llu");
137	WRITE_ASS(branch_sample_type, "llu");
138	WRITE_ASS(sample_regs_user,   "llu");
139	WRITE_ASS(sample_stack_user,  PRIu32);
140
141	fclose(file);
142	return 0;
143}
144
145void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
146		     int fd, int group_fd, unsigned long flags)
147{
148	int errno_saved = errno;
149
150	if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
151		pr_err("test attr FAILED");
152		exit(128);
153	}
154
155	errno = errno_saved;
156}
157
158void test_attr__ready(void)
159{
160	if (unlikely(test_attr__enabled) && !ready)
161		ready = true;
162}
163
164static int run_dir(const char *d, const char *perf)
165{
166	char v[] = "-vvvvv";
167	int vcnt = min(verbose, (int) sizeof(v) - 1);
168	char cmd[3*PATH_MAX];
169
170	if (verbose > 0)
171		vcnt++;
172
173	scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
174		  d, d, perf, vcnt, v);
175
176	return system(cmd) ? TEST_FAIL : TEST_OK;
177}
178
179int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused)
180{
181	struct stat st;
182	char path_perf[PATH_MAX];
183	char path_dir[PATH_MAX];
184
185	/* First try developement tree tests. */
186	if (!lstat("./tests", &st))
187		return run_dir("./tests", "./perf");
188
189	/* Then installed path. */
190	snprintf(path_dir,  PATH_MAX, "%s/tests", get_argv_exec_path());
191	snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
192
193	if (!lstat(path_dir, &st) &&
194	    !lstat(path_perf, &st))
195		return run_dir(path_dir, path_perf);
196
197	return TEST_SKIP;
198}