From patchwork Tue Feb 7 17:43:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wainer dos Santos Moschetta X-Patchwork-Id: 19157 X-Patchwork-Delegate: tuliom@linux.vnet.ibm.com Received: (qmail 72269 invoked by alias); 7 Feb 2017 17:43:31 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 72207 invoked by uid 89); 7 Feb 2017 17:43:30 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=1.1 required=5.0 tests=BAYES_50, KAM_LAZY_DOMAIN_SECURITY, RCVD_IN_DNSWL_LOW autolearn=no version=3.3.2 spammy=le, 1.9.1, misc, sk:wainers X-HELO: mx0a-001b2d01.pphosted.com From: Wainer dos Santos Moschetta To: libc-alpha@sourceware.org Subject: [PATCH v3] powerpc: Add tests for __ppc_set_ppr_* functions. Date: Tue, 7 Feb 2017 15:43:04 -0200 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17020717-0032-0000-0000-0000053BEE67 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17020717-0033-0000-0000-000011BE1871 Message-Id: <20170207174304.19075-1-wainersm@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-07_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=4 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702070168 Changes since v2: - Enabled tests on 32-bit PowerPC. - Improved code comments. --- 8< --- The sys/platform/ppc.h header defines a class of __ppc_set_ppr functions used to set the Program Priority Register (PPR) in PowerPC. This patch implements test cases for these functions. Tested on ppc64le, ppc64, and ppc. 2017-02-07 Wainer dos Santos Moschetta * sysdeps/powerpc/tst-set_ppr.c: New file. Implement test cases for __ppc_set_ppr_* functions. * sysdeps/powerpc/Makefile ($(subdir),misc): Add tst-set_ppr in the list of tests. --- sysdeps/powerpc/Makefile | 1 + sysdeps/powerpc/tst-set_ppr.c | 102 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 103 insertions(+) create mode 100644 sysdeps/powerpc/tst-set_ppr.c diff --git a/sysdeps/powerpc/Makefile b/sysdeps/powerpc/Makefile index 099fbf6..933810f 100644 --- a/sysdeps/powerpc/Makefile +++ b/sysdeps/powerpc/Makefile @@ -34,6 +34,7 @@ endif ifeq ($(subdir),misc) sysdep_headers += sys/platform/ppc.h tests += test-gettimebase +tests += tst-set_ppr endif ifneq (,$(filter %le,$(config-machine))) diff --git a/sysdeps/powerpc/tst-set_ppr.c b/sysdeps/powerpc/tst-set_ppr.c new file mode 100644 index 0000000..a4bf526 --- /dev/null +++ b/sysdeps/powerpc/tst-set_ppr.c @@ -0,0 +1,102 @@ +/* Test the implementation of __ppc_set_ppr_* functions. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include + +#include + +#include + +#ifdef __powerpc64__ + typedef uint64_t ppr_t; +# define MFPPR "mfppr" + /* The thread priority value is obtained from bits 11:13. */ +# define EXTRACT_THREAD_PRIORITY(x) ((x >> 50) & 7) +#else + typedef uint32_t ppr_t; +# define MFPPR "mfppr32" + /* For 32-bit, the upper 32 bits of the Program Priority Register (PPR) + are used, so the thread priority value is obtained from bits 43:46. */ +# define EXTRACT_THREAD_PRIORITY(x) ((x >> 18) & 7) +#endif /* !__powerpc64__ */ + +/* Read the thread priority value set in the PPR. */ +static __inline__ ppr_t +get_thread_priority (void) +{ + /* Read the PPR. */ + ppr_t ppr; + asm volatile (MFPPR" %0" : "=r"(ppr)); + /* Return the thread priority value. */ + return EXTRACT_THREAD_PRIORITY (ppr); +} + +/* Check the thread priority bits of PPR are set as expected. */ +uint8_t +check_thread_priority (uint8_t expected) +{ + ppr_t actual = get_thread_priority (); + + if (actual != expected) + { + printf ("FAIL: Expected %"PRIu8" got %"PRIuMAX".\n", expected, (uintmax_t) actual); + return 1; + } + printf ("PASS: Thread priority set to %"PRIu8" correctly.\n", expected); + return 0; +} + +/* The Power ISA 2.06 allows the following thread priorities for any + problem state program: low (2), medium low (3), and medium (4). + Power ISA 2.07b added very low (1). + Check whether the values set by __ppc_set_ppr_* are correct. */ +static int +do_test (void) +{ + /* Check for the minimum required Power ISA to run these tests. */ + if ((getauxval (AT_HWCAP) & PPC_FEATURE_ARCH_2_06) == 0) + { + printf ("Requires an environment that implements the Power ISA version" + " 2.06 or greater.\n"); + return EXIT_UNSUPPORTED; + } + + uint8_t rc = 0; + +#ifdef _ARCH_PWR8 + __ppc_set_ppr_very_low (); + rc |= check_thread_priority (1); +#endif /* _ARCH_PWR8 */ + + __ppc_set_ppr_low (); + rc |= check_thread_priority (2); + + __ppc_set_ppr_med_low (); + rc |= check_thread_priority (3); + + __ppc_set_ppr_med (); + rc |= check_thread_priority (4); + + return rc; +} + +#include