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perf test: Add watchpoint test
We don't have a 'perf test' entry available to test the watchpoint functionality. Add a simple set of tests: - Read only watchpoint - Write only watchpoint - Read / Write watchpoint - Runtime watchpoint modification Ex.: on powerpc: $ sudo perf test 22 22: Watchpoint : 22.1: Read Only Watchpoint : Ok 22.2: Write Only Watchpoint : Ok 22.3: Read / Write Watchpoint : Ok 22.4: Modify Watchpoint : Ok Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Hendrik Brueckner <brueckner@linux.ibm.com> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Sandipan Das <sandipan@linux.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Richter <tmricht@linux.ibm.com> Link: http://lkml.kernel.org/r/20180912061229.22832-1-ravi.bangoria@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ravi Bangoria
Arnaldo Carvalho de Melo
parent
1627314fb5
commit
2e85d5979e
@ -21,6 +21,7 @@ perf-y += python-use.o
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perf-y += bp_signal.o
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perf-y += bp_signal_overflow.o
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perf-y += bp_account.o
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perf-y += wp.o
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perf-y += task-exit.o
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perf-y += sw-clock.o
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perf-y += mmap-thread-lookup.o
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@ -120,6 +120,15 @@ static struct test generic_tests[] = {
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.func = test__bp_accounting,
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.is_supported = test__bp_signal_is_supported,
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},
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{
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.desc = "Watchpoint",
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.func = test__wp,
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.subtest = {
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.skip_if_fail = false,
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.get_nr = test__wp_subtest_get_nr,
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.get_desc = test__wp_subtest_get_desc,
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},
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},
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{
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.desc = "Number of exit events of a simple workload",
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.func = test__task_exit,
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@ -59,6 +59,9 @@ int test__python_use(struct test *test, int subtest);
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int test__bp_signal(struct test *test, int subtest);
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int test__bp_signal_overflow(struct test *test, int subtest);
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int test__bp_accounting(struct test *test, int subtest);
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int test__wp(struct test *test, int subtest);
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const char *test__wp_subtest_get_desc(int subtest);
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int test__wp_subtest_get_nr(void);
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int test__task_exit(struct test *test, int subtest);
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int test__mem(struct test *test, int subtest);
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int test__sw_clock_freq(struct test *test, int subtest);
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229
tools/perf/tests/wp.c
Normal file
229
tools/perf/tests/wp.c
Normal file
@ -0,0 +1,229 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <linux/hw_breakpoint.h>
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#include "tests.h"
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#include "debug.h"
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#include "cloexec.h"
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#define WP_TEST_ASSERT_VAL(fd, text, val) \
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do { \
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long long count; \
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wp_read(fd, &count, sizeof(long long)); \
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TEST_ASSERT_VAL(text, count == val); \
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} while (0)
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volatile u64 data1;
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volatile u8 data2[3];
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static int wp_read(int fd, long long *count, int size)
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{
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int ret = read(fd, count, size);
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if (ret != size) {
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pr_debug("failed to read: %d\n", ret);
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return -1;
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}
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return 0;
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}
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static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
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void *wp_addr, unsigned long wp_len)
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{
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memset(attr, 0, sizeof(struct perf_event_attr));
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attr->type = PERF_TYPE_BREAKPOINT;
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attr->size = sizeof(struct perf_event_attr);
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attr->config = 0;
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attr->bp_type = wp_type;
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attr->bp_addr = (unsigned long)wp_addr;
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attr->bp_len = wp_len;
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attr->sample_period = 1;
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attr->sample_type = PERF_SAMPLE_IP;
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attr->exclude_kernel = 1;
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attr->exclude_hv = 1;
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}
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static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
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{
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int fd;
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struct perf_event_attr attr;
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get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
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fd = sys_perf_event_open(&attr, 0, -1, -1,
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perf_event_open_cloexec_flag());
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if (fd < 0)
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pr_debug("failed opening event %x\n", attr.bp_type);
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return fd;
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}
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static int wp_ro_test(void)
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{
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int fd;
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unsigned long tmp, tmp1 = rand();
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fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
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if (fd < 0)
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return -1;
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tmp = data1;
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WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
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data1 = tmp1 + tmp;
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WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
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close(fd);
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return 0;
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}
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static int wp_wo_test(void)
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{
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int fd;
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unsigned long tmp, tmp1 = rand();
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fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
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if (fd < 0)
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return -1;
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tmp = data1;
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WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
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data1 = tmp1 + tmp;
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WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
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close(fd);
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return 0;
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}
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static int wp_rw_test(void)
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{
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int fd;
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unsigned long tmp, tmp1 = rand();
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fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
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sizeof(data1));
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if (fd < 0)
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return -1;
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tmp = data1;
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WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
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data1 = tmp1 + tmp;
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WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
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close(fd);
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return 0;
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}
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static int wp_modify_test(void)
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{
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int fd, ret;
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unsigned long tmp = rand();
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struct perf_event_attr new_attr;
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fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
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if (fd < 0)
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return -1;
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data1 = tmp;
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WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
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/* Modify watchpoint with disabled = 1 */
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get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
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sizeof(u8) * 2);
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new_attr.disabled = 1;
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ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
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if (ret < 0) {
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pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
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close(fd);
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return ret;
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}
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data2[1] = tmp; /* Not Counted */
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WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
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/* Enable the event */
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ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
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if (ret < 0) {
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pr_debug("Failed to enable event\n");
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close(fd);
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return ret;
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}
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data2[1] = tmp; /* Counted */
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WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
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data2[2] = tmp; /* Not Counted */
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WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
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close(fd);
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return 0;
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}
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static bool wp_ro_supported(void)
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{
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#if defined (__x86_64__) || defined (__i386__)
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return false;
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#else
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return true;
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#endif
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}
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static void wp_ro_skip_msg(void)
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{
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#if defined (__x86_64__) || defined (__i386__)
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pr_debug("Hardware does not support read only watchpoints.\n");
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#endif
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}
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static struct {
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const char *desc;
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int (*target_func)(void);
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bool (*is_supported)(void);
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void (*skip_msg)(void);
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} wp_testcase_table[] = {
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{
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.desc = "Read Only Watchpoint",
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.target_func = &wp_ro_test,
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.is_supported = &wp_ro_supported,
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.skip_msg = &wp_ro_skip_msg,
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},
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{
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.desc = "Write Only Watchpoint",
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.target_func = &wp_wo_test,
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},
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{
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.desc = "Read / Write Watchpoint",
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.target_func = &wp_rw_test,
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},
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{
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.desc = "Modify Watchpoint",
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.target_func = &wp_modify_test,
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},
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};
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int test__wp_subtest_get_nr(void)
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{
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return (int)ARRAY_SIZE(wp_testcase_table);
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}
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const char *test__wp_subtest_get_desc(int i)
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{
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if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
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return NULL;
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return wp_testcase_table[i].desc;
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}
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int test__wp(struct test *test __maybe_unused, int i)
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{
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if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
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return TEST_FAIL;
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if (wp_testcase_table[i].is_supported &&
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!wp_testcase_table[i].is_supported()) {
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wp_testcase_table[i].skip_msg();
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return TEST_SKIP;
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}
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return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
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}
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