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Sat, 1 Mar 2025 18:23:36 +0000 (GMT) From: Madhavan Srinivasan To: mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu Cc: linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan Subject: [PATCH v2 4/4] powerpc/perf/vpa-pmu: Avoid loading vpa-pmu driver during dump kernel Date: Sat, 1 Mar 2025 23:53:10 +0530 Message-ID: <20250301182310.6832-4-maddy@linux.ibm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250301182310.6832-1-maddy@linux.ibm.com> References: <20250301182310.6832-1-maddy@linux.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: meYX_3Sd2CEAnUpyz6g2ycRHQSrD2cgU X-Proofpoint-ORIG-GUID: ctMOyW9zdyiu7Oa4LoV6Ap8wqTikBuPY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-01_07,2025-02-28_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 mlxscore=0 bulkscore=0 clxscore=1015 spamscore=0 phishscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503010145 vpa-pmu driver is used to collect latency metrics for host to guest or guest to host context switches in a PowerVM KVM guest scenario. These are enabled using CONFIG_VPA_PMU and when these are compiled as built-in, add check for kdump and fadump kernel to avoids loading them, since there are no commandline option to disable them. Signed-off-by: Madhavan Srinivasan --- Changelog v1: - Added more details to commmit message arch/powerpc/perf/vpa-pmu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/perf/vpa-pmu.c b/arch/powerpc/perf/vpa-pmu.c index 6a5bfd2a13b5..f7f72b976c1d 100644 --- a/arch/powerpc/perf/vpa-pmu.c +++ b/arch/powerpc/perf/vpa-pmu.c @@ -10,6 +10,8 @@ #include #include #include +#include +#include #define MODULE_VERS "1.0" #define MODULE_NAME "pseries_vpa_pmu" @@ -183,6 +185,9 @@ static int __init pseries_vpa_pmu_init(void) if (!firmware_has_feature(FW_FEATURE_LPAR) || is_kvm_guest()) return -ENODEV; + if (is_kdump_kernel() || is_fadump_active()) + return 0; + perf_pmu_register(&vpa_pmu, vpa_pmu.name, -1); pr_info("Virtual Processor Area PMU registered.\n"); -- 2.47.0