On 01/13/2015 03:22 AM, Anshuman Khandual wrote:
This patch adds a test which verifies that the DSCR privilege and
problem state SPR read write accesses while making sure that the
results are always the same irrespective of which SPR number is
being used.
Signed-off-by: Anshuman Khandual khand...@linux.vnet.ibm.com
---
tools/testing/selftests/powerpc/dscr/Makefile | 2 +-
.../selftests/powerpc/dscr/dscr_user_test.c| 62
++
2 files changed, 63 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_user_test.c
diff --git a/tools/testing/selftests/powerpc/dscr/Makefile
b/tools/testing/selftests/powerpc/dscr/Makefile
index aede453..ae865d8 100644
--- a/tools/testing/selftests/powerpc/dscr/Makefile
+++ b/tools/testing/selftests/powerpc/dscr/Makefile
@@ -1,4 +1,4 @@
-PROGS := dscr_default_test dscr_explicit_test
+PROGS := dscr_default_test dscr_explicit_test dscr_user_test
CFLAGS := $(CFLAGS) -lpthread
diff --git a/tools/testing/selftests/powerpc/dscr/dscr_user_test.c
b/tools/testing/selftests/powerpc/dscr/dscr_user_test.c
new file mode 100644
index 000..f25d68e
--- /dev/null
+++ b/tools/testing/selftests/powerpc/dscr/dscr_user_test.c
@@ -0,0 +1,62 @@
+/*
+ * POWER Data Stream Control Register (DSCR) SPR test
+ *
+ * This test modifies the DSCR value through both the SPR number
+ * based mtspr instruction and then makes sure that the same is
+ * reflected through mfspr instruction using either of the SPR
+ * numbers.
+ *
+ * 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) 2013 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
+
+static int check_dscr(char *str)
+{
+ unsigned long cur_dscr, cur_dscr_usr;
+
+ cur_dscr = get_dscr();
+ cur_dscr_usr = get_dscr_usr();
+ if (cur_dscr != cur_dscr_usr) {
+ printf(%s set, kernel get %lx != user get %lx\n,
+ str, cur_dscr, cur_dscr_usr);
+ return 1;
+ }
+ return 0;
+}
+
+int test_body(void)
+{
+ int i;
+
+ check_dscr();
+
+ for (i = 0; i COUNT; i++) {
+ set_dscr(i);
+ if (check_dscr(kernel))
+ return 1;
+ }
+
+ for (i = 0; i COUNT; i++) {
+ set_dscr_usr(i);
+ if (check_dscr(user))
+ return 1;
+ }
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ return test_harness(test_body, dscr_user_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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