Commit 5a6bef47 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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perf tests: Test breakpoint overflow signal handler 



Adding automated test for breakpoint event signal handler checking if
it's executed properly.

The test is related to the proper handling of the RF EFLAGS bit on
x86_64, but it's generic for all archs.

First we check the signal handler is properly called and that the
following debug exception return to user space wouldn't trigger
recursive breakpoint.

This is related to x86_64 RF EFLAGS bit being managed in a wrong way.

Second we check that we can set breakpoint in signal handler, which is
not possible on x86_64 if the signal handler is executed with RF EFLAG
set.

This test is inpired by overflow tests done by Vince Weaver.

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1362940871-24486-6-git-send-email-jolsa@redhat.com


[ committer note: s/pr_err/pr_debug/g i.e. print just OK or FAILED in non verbose mode ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 45fa534c

tools/perf/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -511,6 +511,7 @@ LIB_OBJS += $(OUTPUT)tests/evsel-tp-sched.o 
LIB_OBJS += $(OUTPUT)tests/pmu.o

LIB_OBJS += $(OUTPUT)tests/hists_link.o

LIB_OBJS += $(OUTPUT)tests/python-use.o

LIB_OBJS += $(OUTPUT)tests/bp_signal.o



BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o

BUILTIN_OBJS += $(OUTPUT)builtin-bench.o

tools/perf/tests/bp_signal.c

0 → 100644
+186 −0
Original line number Diff line number Diff line 
/*

 * Inspired by breakpoint overflow test done by

 * Vince Weaver <vincent.weaver@maine.edu> for perf_event_tests

 * (git://github.com/deater/perf_event_tests)

 */



#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <string.h>

#include <sys/ioctl.h>

#include <time.h>

#include <fcntl.h>

#include <signal.h>

#include <sys/mman.h>

#include <linux/compiler.h>

#include <linux/hw_breakpoint.h>



#include "tests.h"

#include "debug.h"

#include "perf.h"



static int fd1;

static int fd2;

static int overflows;



__attribute__ ((noinline))

static int test_function(void)

{

	return time(NULL);

}



static void sig_handler(int signum __maybe_unused,

			siginfo_t *oh __maybe_unused,

			void *uc __maybe_unused)

{

	overflows++;



	if (overflows > 10) {

		/*

		 * This should be executed only once during

		 * this test, if we are here for the 10th

		 * time, consider this the recursive issue.

		 *

		 * We can get out of here by disable events,

		 * so no new SIGIO is delivered.

		 */

		ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0);

		ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0);

	}

}



static int bp_event(void *fn, int setup_signal)

{

	struct perf_event_attr pe;

	int fd;



	memset(&pe, 0, sizeof(struct perf_event_attr));

	pe.type = PERF_TYPE_BREAKPOINT;

	pe.size = sizeof(struct perf_event_attr);



	pe.config = 0;

	pe.bp_type = HW_BREAKPOINT_X;

	pe.bp_addr = (unsigned long) fn;

	pe.bp_len = sizeof(long);



	pe.sample_period = 1;

	pe.sample_type = PERF_SAMPLE_IP;

	pe.wakeup_events = 1;



	pe.disabled = 1;

	pe.exclude_kernel = 1;

	pe.exclude_hv = 1;



	fd = sys_perf_event_open(&pe, 0, -1, -1, 0);

	if (fd < 0) {

		pr_debug("failed opening event %llx\n", pe.config);

		return TEST_FAIL;

	}



	if (setup_signal) {

		fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);

		fcntl(fd, F_SETSIG, SIGIO);

		fcntl(fd, F_SETOWN, getpid());

	}



	ioctl(fd, PERF_EVENT_IOC_RESET, 0);



	return fd;

}



static long long bp_count(int fd)

{

	long long count;

	int ret;



	ret = read(fd, &count, sizeof(long long));

	if (ret != sizeof(long long)) {

		pr_debug("failed to read: %d\n", ret);

		return TEST_FAIL;

	}



	return count;

}



int test__bp_signal(void)

{

	struct sigaction sa;

	long long count1, count2;



	/* setup SIGIO signal handler */

	memset(&sa, 0, sizeof(struct sigaction));

	sa.sa_sigaction = (void *) sig_handler;

	sa.sa_flags = SA_SIGINFO;



	if (sigaction(SIGIO, &sa, NULL) < 0) {

		pr_debug("failed setting up signal handler\n");

		return TEST_FAIL;

	}



	/*

	 * We create following events:

	 *

	 * fd1 - breakpoint event on test_function with SIGIO

	 *       signal configured. We should get signal

	 *       notification each time the breakpoint is hit

	 *

	 * fd2 - breakpoint event on sig_handler without SIGIO

	 *       configured.

	 *

	 * Following processing should happen:

	 *   - execute test_function

	 *   - fd1 event breakpoint hit -> count1 == 1

	 *   - SIGIO is delivered       -> overflows == 1

	 *   - fd2 event breakpoint hit -> count2 == 1

	 *

	 * The test case check following error conditions:

	 * - we get stuck in signal handler because of debug

	 *   exception being triggered receursively due to

	 *   the wrong RF EFLAG management

	 *

	 * - we never trigger the sig_handler breakpoint due

	 *   to the rong RF EFLAG management

	 *

	 */



	fd1 = bp_event(test_function, 1);

	fd2 = bp_event(sig_handler, 0);



	ioctl(fd1, PERF_EVENT_IOC_ENABLE, 0);

	ioctl(fd2, PERF_EVENT_IOC_ENABLE, 0);



	/*

	 * Kick off the test by trigering 'fd1'

	 * breakpoint.

	 */

	test_function();



	ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0);

	ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0);



	count1 = bp_count(fd1);

	count2 = bp_count(fd2);



	close(fd1);

	close(fd2);



	pr_debug("count1 %lld, count2 %lld, overflow %d\n",

		 count1, count2, overflows);



	if (count1 != 1) {

		if (count1 == 11)

			pr_debug("failed: RF EFLAG recursion issue detected\n");

		else

			pr_debug("failed: wrong count for bp1%lld\n", count1);

	}



	if (overflows != 1)

		pr_debug("failed: wrong overflow hit\n");



	if (count2 != 1)

		pr_debug("failed: wrong count for bp2\n");



	return count1 == 1 && overflows == 1 && count2 == 1 ?

		TEST_OK : TEST_FAIL;

}

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -77,6 +77,10 @@ static struct test { 
		.desc = "Try 'use perf' in python, checking link problems",

		.func = test__python_use,

	},

	{

		.desc = "Test breakpoint overflow signal handler",

		.func = test__bp_signal,

	},

	{

		.func = NULL,

	},

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -23,5 +23,6 @@ int test__dso_data(void); 
int test__parse_events(void);

int test__hists_link(void);

int test__python_use(void);

int test__bp_signal(void);



#endif /* TESTS_H */

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