From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp06.in.ibm.com (e28smtp06.in.ibm.com [122.248.162.6]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id ED8641A05EF for ; Mon, 18 May 2015 20:56:41 +1000 (AEST) Received: from /spool/local by e28smtp06.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 18 May 2015 16:26:40 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id 564E63940065 for ; Mon, 18 May 2015 16:26:36 +0530 (IST) Received: from d28av02.in.ibm.com (d28av02.in.ibm.com [9.184.220.64]) by d28relay04.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t4IAuInJ62980214 for ; Mon, 18 May 2015 16:26:18 +0530 Received: from d28av02.in.ibm.com (localhost [127.0.0.1]) by d28av02.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t4IAFLvH026161 for ; Mon, 18 May 2015 15:45:21 +0530 From: Anshuman Khandual To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH V4 08/13] selftests, powerpc: Add test for DSCR SPR numbers Date: Mon, 18 May 2015 16:26:11 +0530 Message-Id: <1431946576-1009-9-git-send-email-khandual@linux.vnet.ibm.com> In-Reply-To: <1431946576-1009-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1431946576-1009-1-git-send-email-khandual@linux.vnet.ibm.com> Cc: mikey@neuling.org, shuahkh@osg.samsung.com, anton@samba.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Signed-off-by: Anton Blanchard --- 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 , 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 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"); +} -- 1.9.3