| /******************************************************************************/ |
| /* */ |
| /* Ingo Molnar <mingo@elte.hu>, 2009 */ |
| /* */ |
| /* This program is free software; you can redistribute it and/or modify */ |
| /* it under the terms of the GNU General Public License as published by */ |
| /* the Free Software Foundation; either version 2 of the License, or */ |
| /* (at your option) any later version. */ |
| /* */ |
| /* This program is distributed in the hope that it will be useful, */ |
| /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ |
| /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ |
| /* the GNU General Public License for more details. */ |
| /* */ |
| /* You should have received a copy of the GNU General Public License */ |
| /* along with this program; if not, write to the Free Software */ |
| /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ |
| /* */ |
| /******************************************************************************/ |
| |
| /* |
| * Very simple performance counter testcase. |
| * Picked up from: http://lkml.org/lkml/2008/12/5/17 |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/uio.h> |
| #include <linux/unistd.h> |
| #include <assert.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <stdint.h> |
| #include "config.h" |
| #if HAVE_PERF_EVENT_ATTR |
| # include <linux/perf_event.h> |
| #endif |
| |
| #include "test.h" |
| #include "linux_syscall_numbers.h" |
| #include "safe_macros.h" |
| |
| char *TCID = "perf_event_open01"; |
| |
| #if HAVE_PERF_EVENT_ATTR |
| static void setup(void); |
| static void cleanup(void); |
| |
| static struct test_case_t { |
| uint32_t type; |
| const char *config_name; |
| unsigned long long config; |
| } event_types[] = { |
| { PERF_TYPE_HARDWARE, "PERF_COUNT_HW_INSTRUCTIONS", |
| PERF_COUNT_HW_INSTRUCTIONS }, |
| { PERF_TYPE_HARDWARE, "PERF_COUNT_HW_CACHE_REFERENCES", |
| PERF_COUNT_HW_CACHE_REFERENCES }, |
| { PERF_TYPE_HARDWARE, "PERF_COUNT_HW_CACHE_MISSES", |
| PERF_COUNT_HW_CACHE_MISSES }, |
| { PERF_TYPE_HARDWARE, "PERF_COUNT_HW_BRANCH_INSTRUCTIONS", |
| PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, |
| { PERF_TYPE_HARDWARE, "PERF_COUNT_HW_BRANCH_MISSES", |
| PERF_COUNT_HW_BRANCH_MISSES }, |
| { PERF_TYPE_SOFTWARE, "PERF_COUNT_SW_CPU_CLOCK", |
| PERF_COUNT_SW_CPU_CLOCK }, |
| { PERF_TYPE_SOFTWARE, "PERF_COUNT_SW_TASK_CLOCK", |
| PERF_COUNT_SW_TASK_CLOCK }, |
| }; |
| |
| int TST_TOTAL = ARRAY_SIZE(event_types); |
| |
| static void verify(struct test_case_t *tc); |
| static struct perf_event_attr pe; |
| |
| int main(int ac, char **av) |
| { |
| int i, lc; |
| const char *msg; |
| |
| msg = parse_opts(ac, av, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| for (i = 0; i < TST_TOTAL; i++) |
| verify(&event_types[i]); |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| /* |
| * According to perf_event_open's manpage, the official way of |
| * knowing if perf_event_open() support is enabled is checking for |
| * the existence of the file /proc/sys/kernel/perf_event_paranoid. |
| */ |
| if (access("/proc/sys/kernel/perf_event_paranoid", F_OK) == -1) |
| tst_brkm(TCONF, NULL, "Kernel doesn't have perf_event support"); |
| |
| tst_sig(NOFORK, DEF_HANDLER, cleanup); |
| |
| TEST_PAUSE; |
| |
| pe.size = sizeof(struct perf_event_attr); |
| pe.disabled = 1; |
| pe.exclude_kernel = 1; |
| pe.exclude_hv = 1; |
| } |
| |
| |
| static int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, |
| int cpu, int group_fd, unsigned long flags) |
| { |
| int ret; |
| |
| ret = ltp_syscall(__NR_perf_event_open, hw_event, pid, cpu, |
| group_fd, flags); |
| return ret; |
| } |
| |
| /* do_work() is copied form performance_counter02.c */ |
| #define LOOPS 1000000000 |
| |
| static void do_work(void) |
| { |
| int i; |
| |
| for (i = 0; i < LOOPS; ++i) |
| asm volatile ("" : : "g" (i)); |
| } |
| |
| static void verify(struct test_case_t *tc) |
| { |
| unsigned long long count; |
| int fd, ret; |
| |
| pe.type = tc->type; |
| pe.config = tc->config; |
| |
| TEST(perf_event_open(&pe, 0, -1, -1, 0)); |
| if (TEST_RETURN == -1) { |
| if (TEST_ERRNO == ENOENT) { |
| tst_resm(TCONF, |
| "perf_event_open for %s not supported", |
| tc->config_name); |
| } else { |
| tst_brkm(TFAIL | TTERRNO, cleanup, |
| "perf_event_open failed unexpectedly"); |
| } |
| return; |
| } |
| |
| fd = TEST_RETURN; |
| |
| if (ioctl(fd, PERF_EVENT_IOC_RESET, 0) == -1) { |
| tst_brkm(TFAIL | TTERRNO, cleanup, |
| "ioctl set PERF_EVENT_IOC_RESET failed"); |
| } |
| |
| if (ioctl(fd, PERF_EVENT_IOC_ENABLE, 0) == -1) { |
| tst_brkm(TFAIL | TTERRNO, cleanup, |
| "ioctl set PERF_EVENT_IOC_ENABLE failed"); |
| } |
| |
| do_work(); |
| |
| if (ioctl(fd, PERF_EVENT_IOC_DISABLE, 0) == -1) { |
| tst_brkm(TFAIL | TTERRNO, cleanup, |
| "ioctl set PERF_EVENT_IOC_RESET failed"); |
| } |
| |
| ret = read(fd, &count, sizeof(count)); |
| if (ret == sizeof(count)) { |
| tst_resm(TINFO, "read event counter succeeded, " |
| "value: %llu", count); |
| tst_resm(TPASS, "test PERF_TYPE_HARDWARE: %s succeeded", |
| tc->config_name); |
| } else { |
| tst_resm(TFAIL | TERRNO, "read event counter failed"); |
| } |
| |
| SAFE_CLOSE(cleanup, fd); |
| |
| } |
| |
| static void cleanup(void) |
| { |
| } |
| |
| #else |
| |
| int main(void) |
| { |
| tst_brkm(TCONF, NULL, "This system doesn't have " |
| "header file:<linux/perf_event.h> or " |
| "no struct perf_event_attr defined"); |
| } |
| #endif |