[RFC PATCH for 4.15 22/22] membarrier: selftest: Test shared expedited cmd

From: Mathieu Desnoyers
Date: Tue Nov 21 2017 - 09:21:06 EST


Test the new MEMBARRIER_CMD_SHARED_EXPEDITED and
MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED commands.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Acked-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CC: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CC: Boqun Feng <boqun.feng@xxxxxxxxx>
CC: Andrew Hunter <ahh@xxxxxxxxxx>
CC: Maged Michael <maged.michael@xxxxxxxxx>
CC: Avi Kivity <avi@xxxxxxxxxxxx>
CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
CC: Paul Mackerras <paulus@xxxxxxxxx>
CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
CC: Dave Watson <davejwatson@xxxxxx>
CC: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
CC: Will Deacon <will.deacon@xxxxxxx>
CC: Andy Lutomirski <luto@xxxxxxxxxx>
CC: Alice Ferrazzi <alice.ferrazzi@xxxxxxxxx>
CC: Paul Elder <paul.elder@xxxxxxxx>
CC: linux-kselftest@xxxxxxxxxxxxxxx
CC: linux-arch@xxxxxxxxxxxxxxx
---
.../testing/selftests/membarrier/membarrier_test.c | 51 +++++++++++++++++++++-
1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/membarrier/membarrier_test.c b/tools/testing/selftests/membarrier/membarrier_test.c
index e6ee73d01fa1..bb9c58072c5c 100644
--- a/tools/testing/selftests/membarrier/membarrier_test.c
+++ b/tools/testing/selftests/membarrier/membarrier_test.c
@@ -132,6 +132,40 @@ static int test_membarrier_private_expedited_success(void)
return 0;
}

+static int test_membarrier_register_shared_expedited_success(void)
+{
+ int cmd = MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED, flags = 0;
+ const char *test_name = "sys membarrier MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED";
+
+ if (sys_membarrier(cmd, flags) != 0) {
+ ksft_exit_fail_msg(
+ "%s test: flags = %d, errno = %d\n",
+ test_name, flags, errno);
+ }
+
+ ksft_test_result_pass(
+ "%s test: flags = %d\n",
+ test_name, flags);
+ return 0;
+}
+
+static int test_membarrier_shared_expedited_success(void)
+{
+ int cmd = MEMBARRIER_CMD_SHARED_EXPEDITED, flags = 0;
+ const char *test_name = "sys membarrier MEMBARRIER_CMD_SHARED_EXPEDITED";
+
+ if (sys_membarrier(cmd, flags) != 0) {
+ ksft_exit_fail_msg(
+ "%s test: flags = %d, errno = %d\n",
+ test_name, flags, errno);
+ }
+
+ ksft_test_result_pass(
+ "%s test: flags = %d\n",
+ test_name, flags);
+ return 0;
+}
+
static int test_membarrier(void)
{
int status;
@@ -154,6 +188,19 @@ static int test_membarrier(void)
status = test_membarrier_private_expedited_success();
if (status)
return status;
+ /*
+ * It is valid to send a shared membarrier from a non-registered
+ * process.
+ */
+ status = test_membarrier_shared_expedited_success();
+ if (status)
+ return status;
+ status = test_membarrier_register_shared_expedited_success();
+ if (status)
+ return status;
+ status = test_membarrier_shared_expedited_success();
+ if (status)
+ return status;
return 0;
}

@@ -173,8 +220,10 @@ static int test_membarrier_query(void)
}
ksft_exit_fail_msg("sys_membarrier() failed\n");
}
- if (!(ret & MEMBARRIER_CMD_SHARED))
+ if (!(ret & MEMBARRIER_CMD_SHARED)) {
+ ksft_test_result_fail("sys_membarrier() CMD_SHARED query failed\n");
ksft_exit_fail_msg("sys_membarrier is not supported.\n");
+ }

ksft_test_result_pass("sys_membarrier available\n");
return 0;
--
2.11.0