From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Cc: mikey@neuling.org, anton@samba.org, shuahkh@osg.samsung.com,
mpe@ellerman.id.au
Subject: [PATCH V5 08/13] selftests, powerpc: Add test for DSCR SPR numbers
Date: Thu, 21 May 2015 12:13:08 +0530 [thread overview]
Message-ID: <1432190593-17253-9-git-send-email-khandual@linux.vnet.ibm.com> (raw)
In-Reply-To: <1432190593-17253-1-git-send-email-khandual@linux.vnet.ibm.com>
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.
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
---
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 0000000..c23c2f3
--- /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 <anton@au.ibm.com>, IBM
+ * Copyright (C) 2015 Anshuman Khandual <khandual@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 dscr_user(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(dscr_user, "dscr_user_test");
+}
--
2.1.0
next prev parent reply other threads:[~2015-05-21 6:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-21 6:43 [PATCH V5 00/13] POWER DSCR fixes, improvements, docs and tests Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 01/13] powerpc: Fix handling of DSCR related facility unavailable exception Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 02/13] powerpc, process: Remove the unused extern dscr_default Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 03/13] powerpc, offset: Change PACA_DSCR to PACA_DSCR_DEFAULT Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 04/13] powerpc, dscr: Added some in-code documentation Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 05/13] documentation, powerpc: Add documentation for DSCR support Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 06/13] selftests, powerpc: Add test for system wide DSCR default Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 07/13] selftests, powerpc: Add test for explicitly changing DSCR value Anshuman Khandual
2015-05-21 6:43 ` Anshuman Khandual [this message]
2015-05-21 6:43 ` [PATCH V5 09/13] selftests, powerpc: Add test for DSCR value inheritence across fork Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 10/13] selftests, powerpc: Add test for DSCR inheritence across fork & exec Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 11/13] selftests, powerpc: Add test for all DSCR sysfs interfaces Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 12/13] selftests, powerpc: Add thread based stress test for " Anshuman Khandual
2015-06-03 8:44 ` Anshuman Khandual
2015-05-21 6:43 ` [PATCH V5 13/13] selftests, powerpc: Add gitignore file for the new DSCR tests Anshuman Khandual
2015-05-25 8:38 ` [PATCH V5 00/13] POWER DSCR fixes, improvements, docs and tests Anshuman Khandual
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1432190593-17253-9-git-send-email-khandual@linux.vnet.ibm.com \
--to=khandual@linux.vnet.ibm.com \
--cc=anton@samba.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=mpe@ellerman.id.au \
--cc=shuahkh@osg.samsung.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).