Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / testing / selftests / powerpc / pmu / ebb / ebb_on_child_test.c

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_child_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_child_test.c
new file mode 100644 (file)
index 0000000..c45f948
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_child_test.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "ebb.h"
+
+
+/*
+ * Tests we can setup an EBB on our child. Nothing interesting happens, because
+ * even though the event is enabled and running the child hasn't enabled the
+ * actual delivery of the EBBs.
+ */
+
+static int victim_child(union pipe read_pipe, union pipe write_pipe)
+{
+       int i;
+
+       FAIL_IF(wait_for_parent(read_pipe));
+       FAIL_IF(notify_parent(write_pipe));
+
+       /* Parent creates EBB event */
+
+       FAIL_IF(wait_for_parent(read_pipe));
+       FAIL_IF(notify_parent(write_pipe));
+
+       /* Check the EBB is enabled by writing PMC1 */
+       write_pmc1();
+
+       /* EBB event is enabled here */
+       for (i = 0; i < 1000000; i++) ;
+
+       return 0;
+}
+
+int ebb_on_child(void)
+{
+       union pipe read_pipe, write_pipe;
+       struct event event;
+       pid_t pid;
+
+       FAIL_IF(pipe(read_pipe.fds) == -1);
+       FAIL_IF(pipe(write_pipe.fds) == -1);
+
+       pid = fork();
+       if (pid == 0) {
+               /* NB order of pipes looks reversed */
+               exit(victim_child(write_pipe, read_pipe));
+       }
+
+       FAIL_IF(sync_with_child(read_pipe, write_pipe));
+
+       /* Child is running now */
+
+       event_init_named(&event, 0x1001e, "cycles");
+       event_leader_ebb_init(&event);
+
+       event.attr.exclude_kernel = 1;
+       event.attr.exclude_hv = 1;
+       event.attr.exclude_idle = 1;
+
+       FAIL_IF(event_open_with_pid(&event, pid));
+       FAIL_IF(ebb_event_enable(&event));
+
+       FAIL_IF(sync_with_child(read_pipe, write_pipe));
+
+       /* Child should just exit happily */
+       FAIL_IF(wait_for_child(pid));
+
+       event_close(&event);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(ebb_on_child, "ebb_on_child");
+}