selftests/powerpc: Add tests of PMU EBBs

[karo-tx-linux.git] / tools / testing / selftests / powerpc / pmu / ebb / multi_ebb_procs_test.c

diff --git a/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c b/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c
new file mode 100644 (file)
index 0000000..b8dc371
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include "ebb.h"
+
+
+/*
+ * Test running multiple EBB using processes at once on a single CPU. They
+ * should all run happily without interfering with each other.
+ */
+
+static bool child_should_exit;
+
+static void sigint_handler(int signal)
+{
+       child_should_exit = true;
+}
+
+struct sigaction sigint_action = {
+       .sa_handler = sigint_handler,
+};
+
+static int cycles_child(void)
+{
+       struct event event;
+
+       if (sigaction(SIGINT, &sigint_action, NULL)) {
+               perror("sigaction");
+               return 1;
+       }
+
+       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(&event));
+
+       ebb_enable_pmc_counting(1);
+       setup_ebb_handler(standard_ebb_callee);
+       ebb_global_enable();
+
+       FAIL_IF(ebb_event_enable(&event));
+
+       mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
+
+       while (!child_should_exit) {
+               FAIL_IF(core_busy_loop());
+               FAIL_IF(ebb_check_mmcr0());
+       }
+
+       ebb_global_disable();
+       ebb_freeze_pmcs();
+
+       count_pmc(1, sample_period);
+
+       dump_summary_ebb_state();
+
+       event_close(&event);
+
+       FAIL_IF(ebb_state.stats.ebb_count == 0);
+
+       return 0;
+}
+
+#define NR_CHILDREN    4
+
+int multi_ebb_procs(void)
+{
+       pid_t pids[NR_CHILDREN];
+       int cpu, rc, i;
+
+       cpu = pick_online_cpu();
+       FAIL_IF(cpu < 0);
+       FAIL_IF(bind_to_cpu(cpu));
+
+       for (i = 0; i < NR_CHILDREN; i++) {
+               pids[i] = fork();
+               if (pids[i] == 0)
+                       exit(cycles_child());
+       }
+
+       /* Have them all run for "a while" */
+       sleep(10);
+
+       rc = 0;
+       for (i = 0; i < NR_CHILDREN; i++) {
+               /* Tell them to stop */
+               kill(pids[i], SIGINT);
+               /* And wait */
+               rc |= wait_for_child(pids[i]);
+       }
+
+       return rc;
+}
+
+int main(void)
+{
+       return test_harness(multi_ebb_procs, "multi_ebb_procs");
+}