From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.s-osg.org (lists.s-osg.org [54.187.51.154]) by lists.ozlabs.org (Postfix) with ESMTP id 4F6231A0D73 for ; Wed, 14 Jan 2015 02:23:35 +1100 (AEDT) Message-ID: <54B53875.5020404@osg.samsung.com> Date: Tue, 13 Jan 2015 08:23:33 -0700 From: Shuah Khan MIME-Version: 1.0 To: Anshuman Khandual , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2 07/12] selftests, powerpc: Add test for explicitly changing DSCR value References: <1421144560-15901-1-git-send-email-khandual@linux.vnet.ibm.com> <1421144560-15901-8-git-send-email-khandual@linux.vnet.ibm.com> In-Reply-To: <1421144560-15901-8-git-send-email-khandual@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252 Cc: mikey@neuling.org, anton@samba.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 > --- > 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 0000000..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 , 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" > + > +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 Please take this through powerpc maintainer git. thanks, -- Shuah -- Shuah Khan Sr. Linux Kernel Developer Open Source Innovation Group Samsung Research America (Silicon Valley) shuahkh@osg.samsung.com | (970) 217-8978