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Mon, 13 Jan 2025 07:59:26 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 50D7xMu553936390 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 Jan 2025 07:59:22 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AF02F2004F; Mon, 13 Jan 2025 07:59:22 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8136E2004D; Mon, 13 Jan 2025 07:59:19 +0000 (GMT) Received: from localhost.localdomain (unknown [9.61.243.204]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 13 Jan 2025 07:59:19 +0000 (GMT) From: Athira Rajeev To: linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, hbathini@linux.ibm.com Cc: atrajeev@linux.vnet.ibm.com, kjain@linux.ibm.com, disgoel@linux.vnet.ibm.com Subject: [PATCH V2 5/5] selftests/powerpc/pmu: Update comment with details to understand auxv_generic_compat_pmu() utility function Date: Mon, 13 Jan 2025 13:28:58 +0530 Message-Id: <20250113075858.45137-5-atrajeev@linux.vnet.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20250113075858.45137-1-atrajeev@linux.vnet.ibm.com> References: <20250113075858.45137-1-atrajeev@linux.vnet.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: aipUeWloVBgkdC7rpkHLbhioV3suYH2C X-Proofpoint-ORIG-GUID: aipUeWloVBgkdC7rpkHLbhioV3suYH2C X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 mlxlogscore=999 bulkscore=0 clxscore=1015 malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501130067 auxv_generic_compat_pmu() utility function is to detect whether the system is having generic compat PMU. The check is based on base platform value from /proc/self/auxv. Update the comment with details on how auxv is used to detect the platform. Signed-off-by: Athira Rajeev --- Changelog: v1 -> v2 New patch added in V2 tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c index 1ba675802ee9..8a538b6182a1 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c @@ -497,6 +497,13 @@ int get_thresh_cmp_val(struct event event) * Utility function to check for generic compat PMU * by comparing base_platform value from auxv and real * PVR value. + * auxv_base_platform() func gives information of "base platform" + * corresponding to PVR value. Incase, if the distro doesn't + * support platform PVR (missing cputable support), base platform + * in auxv will have a default value other than the real PVR's. + * In this case, ISAv3 PMU (generic compat PMU) will be registered + * in the system. auxv_generic_compat_pmu() makes use of the base + * platform value from auxv to do this check. */ static bool auxv_generic_compat_pmu(void) { -- 2.43.5