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authorMichael Ellerman <mpe@ellerman.id.au>2015-06-07 11:25:16 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2015-06-07 11:38:18 +0200
commitaf0be08ee6ab83666f2cb3c56285cf7a312eaeab (patch)
tree86826308e0d8edeb093e3a55a13dd5eabf095478 /tools/testing
parentselftests/powerpc: Add test for all DSCR sysfs interfaces (diff)
downloadlinux-af0be08ee6ab83666f2cb3c56285cf7a312eaeab.tar.xz
linux-af0be08ee6ab83666f2cb3c56285cf7a312eaeab.zip
selftests/powerpc: Add thread based stress test for DSCR sysfs interfaces
This patch adds a test to update the system wide DSCR value repeatedly and then verifies that any thread on any given CPU on the system must be able to see the same DSCR value whether its is being read through the problem state based SPR or the privilege state based SPR. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/powerpc/dscr/Makefile3
-rw-r--r--tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c80
2 files changed, 82 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/dscr/Makefile b/tools/testing/selftests/powerpc/dscr/Makefile
index de0b53b533d4..49327ee84e3a 100644
--- a/tools/testing/selftests/powerpc/dscr/Makefile
+++ b/tools/testing/selftests/powerpc/dscr/Makefile
@@ -1,5 +1,6 @@
TEST_PROGS := dscr_default_test dscr_explicit_test dscr_user_test \
- dscr_inherit_test dscr_inherit_exec_test dscr_sysfs_test
+ dscr_inherit_test dscr_inherit_exec_test dscr_sysfs_test \
+ dscr_sysfs_thread_test
dscr_default_test: LDLIBS += -lpthread
diff --git a/tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c b/tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c
new file mode 100644
index 000000000000..ad97b592eccc
--- /dev/null
+++ b/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");
+}