On 01/13/2015 03:22 AM, Anshuman Khandual wrote:
This patch adds a test which modifies the DSCR using mtspr instruction
and verifies the change using mfspr instruction. It uses both the
privilege state SPR as well as the problem state SPR for the purpose.
Signed-off-by: Anshuman Khandual khand...@linux.vnet.ibm.com
---
tools/testing/selftests/powerpc/dscr/Makefile | 2 +-
.../selftests/powerpc/dscr/dscr_explicit_test.c| 72
++
2 files changed, 73 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
diff --git a/tools/testing/selftests/powerpc/dscr/Makefile
b/tools/testing/selftests/powerpc/dscr/Makefile
index 0aa90ab..aede453 100644
--- a/tools/testing/selftests/powerpc/dscr/Makefile
+++ b/tools/testing/selftests/powerpc/dscr/Makefile
@@ -1,4 +1,4 @@
-PROGS := dscr_default_test
+PROGS := dscr_default_test dscr_explicit_test
CFLAGS := $(CFLAGS) -lpthread
diff --git a/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
b/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
new file mode 100644
index 000..5c0b7c1
--- /dev/null
+++ b/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
@@ -0,0 +1,72 @@
+/*
+ * POWER Data Stream Control Register (DSCR) explicit test
+ *
+ * This test modifies the DSCR value using mtspr instruction and
+ * verifies the change with mfspr instruction. It uses both the
+ * privilege state SPR and the problem state SPR for this purpose.
+ *
+ * When using the privilege state SPR, the instructions such as
+ * mfspr or mtspr are priviledged and the kernel emulates them
+ * for us. Instructions using problem state SPR can be exuecuted
+ * directly without any emulation if the HW supports them. Else
+ * they also get emulated by the kernel.
+ *
+ * Copyright (C) 2012 Anton Blanchard an...@au.ibm.com, IBM
+ * Copyright (C) 2015 Anshuman Khandual khand...@linux.vnet.ibm.com, IBM
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include dscr.h
+
+int test_body(void)
+{
+ unsigned long i, dscr = 0;
+
+ srand(getpid());
+ set_dscr(dscr);
+
+ for (i = 0; i COUNT; i++) {
+ unsigned long cur_dscr, cur_dscr_usr;
+ double ret = uniform_deviate(rand());
+
+ if (ret 0.001) {
+ dscr++;
+ if (dscr DSCR_MAX)
+ dscr = 0;
+
+ set_dscr(dscr);
+ }
+
+ cur_dscr = get_dscr();
+ if (cur_dscr != dscr) {
+ fprintf(stderr, Kernel DSCR should be %ld but
+ is %ld\n, dscr, cur_dscr);
+ return 1;
+ }
+
+ ret = uniform_deviate(rand());
+ if (ret 0.001) {
+ dscr++;
+ if (dscr DSCR_MAX)
+ dscr = 0;
+
+ set_dscr_usr(dscr);
+ }
+
+ cur_dscr_usr = get_dscr_usr();
+ if (cur_dscr_usr != dscr) {
+ fprintf(stderr, User DSCR should be %ld but
+ is %ld\n, dscr, cur_dscr_usr);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ return test_harness(test_body, dscr_explicit_test);
+}
Could you please add a .gitignore for powerpc targets as we
discussed earlier. It can be separate patch.
Also, I would like to see the test results reports using
kselftest.h - it can be separate patch in the interest of
getting tests in.
Acked-by: Shuah Khan shua...@osg.samsung.com
Please take this through powerpc maintainer git.
thanks,
-- Shuah
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shua...@osg.samsung.com | (970) 217-8978
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