Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c
new file mode 100644 (file)
index 0000000..d56607e
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c
@@ -0,0 +1,91 @@
+/*
+ * 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 a pinned per-task event vs an EBB - in that order. The pinned per-task
+ * event should prevent the EBB event from being enabled.
+ */
+
+static int setup_child_event(struct event *event, pid_t child_pid)
+{
+       event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL");
+
+       event->attr.pinned = 1;
+
+       event->attr.exclude_kernel = 1;
+       event->attr.exclude_hv = 1;
+       event->attr.exclude_idle = 1;
+
+       FAIL_IF(event_open_with_pid(event, child_pid));
+       FAIL_IF(event_enable(event));
+
+       return 0;
+}
+
+int task_event_pinned_vs_ebb(void)
+{
+       union pipe read_pipe, write_pipe;
+       struct event event;
+       pid_t pid;
+       int rc;
+
+       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(ebb_child(write_pipe, read_pipe));
+       }
+
+       /* We setup the task event first */
+       rc = setup_child_event(&event, pid);
+       if (rc) {
+               kill_child_and_wait(pid);
+               return rc;
+       }
+
+       /* Signal the child to install its EBB event and wait */
+       if (sync_with_child(read_pipe, write_pipe))
+               /* If it fails, wait for it to exit */
+               goto wait;
+
+       /* Signal the child to run */
+       FAIL_IF(sync_with_child(read_pipe, write_pipe));
+
+wait:
+       /* We expect it to fail to read the event */
+       FAIL_IF(wait_for_child(pid) != 2);
+       FAIL_IF(event_disable(&event));
+       FAIL_IF(event_read(&event));
+
+       event_report(&event);
+
+       FAIL_IF(event.result.value == 0);
+       /*
+        * For reasons I don't understand enabled is usually just slightly
+        * lower than running. Would be good to confirm why.
+        */
+       FAIL_IF(event.result.enabled == 0);
+       FAIL_IF(event.result.running == 0);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb");
+}