Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932417AbbDJIdp (ORCPT ); Fri, 10 Apr 2015 04:33:45 -0400 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:37793 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754606AbbDJIb1 (ORCPT ); Fri, 10 Apr 2015 04:31:27 -0400 From: Anshuman Khandual To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: mikey@neuling.org, shuahkh@osg.samsung.com, mpe@ellerman.id.au Subject: [PATCH V3 08/13] selftests, powerpc: Add test for DSCR SPR numbers Date: Fri, 10 Apr 2015 14:00:07 +0530 Message-Id: <1428654612-23539-9-git-send-email-khandual@linux.vnet.ibm.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1428654612-23539-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1428654612-23539-1-git-send-email-khandual@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15041008-0013-0000-0000-0000011314DE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3163 Lines: 99 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 Signed-off-by: Anshuman Khandual --- 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..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 , IBM + * Copyright (C) 2015 Anshuman Khandual , 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"); +} -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/