These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / tools / testing / selftests / powerpc / dscr / dscr_sysfs_thread_test.c

diff --git a/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c b/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c
new file mode 100644 (file)
index 0000000..ad97b59
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c
@@ -0,0 +1,80 @@
+/*
+ * POWER Data Stream Control Register (DSCR) sysfs thread test
+ *
+ * This test updates the system wide DSCR default value through
+ * sysfs interface which should then update all the CPU specific
+ * DSCR default values which must also be then visible to threads
+ * executing on individual CPUs on the system.
+ *
+ * Copyright 2015, Anshuman Khandual, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+#define _GNU_SOURCE
+#include "dscr.h"
+
+static int test_thread_dscr(unsigned long val)
+{
+       unsigned long cur_dscr, cur_dscr_usr;
+
+       cur_dscr = get_dscr();
+       cur_dscr_usr = get_dscr_usr();
+
+       if (val != cur_dscr) {
+               printf("[cpu %d] Kernel DSCR should be %ld but is %ld\n",
+                                       sched_getcpu(), val, cur_dscr);
+               return 1;
+       }
+
+       if (val != cur_dscr_usr) {
+               printf("[cpu %d] User DSCR should be %ld but is %ld\n",
+                                       sched_getcpu(), val, cur_dscr_usr);
+               return 1;
+       }
+       return 0;
+}
+
+static int check_cpu_dscr_thread(unsigned long val)
+{
+       cpu_set_t mask;
+       int cpu;
+
+       for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
+               CPU_ZERO(&mask);
+               CPU_SET(cpu, &mask);
+               if (sched_setaffinity(0, sizeof(mask), &mask))
+                       continue;
+
+               if (test_thread_dscr(val))
+                       return 1;
+       }
+       return 0;
+
+}
+
+int dscr_sysfs_thread(void)
+{
+       unsigned long orig_dscr_default;
+       int i, j;
+
+       orig_dscr_default = get_default_dscr();
+       for (i = 0; i < COUNT; i++) {
+               for (j = 0; j < DSCR_MAX; j++) {
+                       set_default_dscr(j);
+                       if (check_cpu_dscr_thread(j))
+                               goto fail;
+               }
+       }
+       set_default_dscr(orig_dscr_default);
+       return 0;
+fail:
+       set_default_dscr(orig_dscr_default);
+       return 1;
+}
+
+int main(int argc, char *argv[])
+{
+       return test_harness(dscr_sysfs_thread, "dscr_sysfs_thread_test");
+}