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Tue, 22 Apr 2025 04:51:07 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 790155804B; Tue, 22 Apr 2025 04:51:09 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 60F4A58059; Tue, 22 Apr 2025 04:51:06 +0000 (GMT) Received: from smtpclient.apple (unknown [9.204.204.179]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTPS; Tue, 22 Apr 2025 04:51:06 +0000 (GMT) From: Venkat Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.600.62\)) Subject: Re: [PATCH] powerpc/pseries/msi: Avoid reading PCI device registers in reduced power states Message-Id: <3E89A76F-21AD-48BB-9333-1A43C04DB3B7@linux.ibm.com> Date: Tue, 22 Apr 2025 10:20:53 +0530 Cc: christophe.leroy@csgroup.eu, LKML , linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, Michael Ellerman , naveen@kernel.org, npiggin@gmail.com, vaibhav@linux.ibm.com, venkat88@linux.ibm.com To: gautam@linux.ibm.com X-Mailer: Apple Mail (2.3774.600.62) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: z-4OhsSuDGxULhVEBR37XHiVRME4ggCf X-Proofpoint-ORIG-GUID: P8eONft-5Cpo1zNG2YdXomlPyi-AFG9n X-Authority-Analysis: v=2.4 cv=N6QpF39B c=1 sm=1 tr=0 ts=68072040 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=XR8D0OoHHMoA:10 a=TGiKNIM0BPefvecU2IEA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-22_02,2025-04-21_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 bulkscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 spamscore=0 mlxlogscore=249 clxscore=1015 suspectscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504220033 Hello Gautam, Makes sense to track this observation separately. I tried it on fedora41 = with kernel, 6.11.4-301.fc41.ppc64le, and this warning is there also.=20 Traces: [ 105.121663] ------------[ cut here ]------------ [ 105.121664] WARNING: CPU: 0 PID: 16 at = arch/powerpc/sysdev/xics/icp-hv.c:55 icp_hv_eoi+0xf8/0x120 [ 105.121683] Modules linked in: bonding tls nft_fib_inet nft_fib_ipv4 = nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 = nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 = nf_defrag_ipv4 rfkill nf_tables sunrpc ibmveth [ 105.121719] PM: suspend exit [ 105.121720] pseries_rng vmx_crypto crct10dif_vpmsum fuse = dm_multipath loop nfnetlink zram vsock_loopback = vmw_vsock_virtio_transport_common vsock xfs ibmvscsi scsi_transport_srp = crc32c_vpmsum scsi_dh_rdac scsi_dh_emc scsi_dh_alua [ 105.121790] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted = 6.11.4-301.fc41.ppc64le #1 [ 105.121800] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 = 0xf000005 of:IBM,FW950.A0 (VL950_144) hv:phyp pSeries [ 105.121808] NIP: c0000000000d5068 LR: c0000000000d5064 CTR: = c00000000011d810 [ 105.121811] REGS: c000000004c87a20 TRAP: 0700 Not tainted = (6.11.4-301.fc41.ppc64le) [ 105.121821] MSR: 800000000282b033 = CR: 44004202 XER: 00000010 [ 105.121845] CFAR: c000000000246c2c IRQMASK: 1=20 [ 105.121845] GPR00: c0000000000d5064 c000000004c87cc0 c0000000021c0900 = 000000000000003f=20 [ 105.121845] GPR04: 00000000ffffdfff 00000000ffffdfff c000000004c87ab8 = 00000007f8e50000=20 [ 105.121845] GPR08: 0000000000000027 c0000007fc007190 0000000000000001 = 0000000044004202=20 [ 105.121845] GPR12: c00000000011d810 c000000003f40000 c0000000001bf378 = c000000004f07640=20 [ 105.121845] GPR16: 0000000000000000 0000000004208040 c000000003d12a80 = c000000003242e80=20 [ 105.121845] GPR20: 00000000ffffb375 000000000000000a c0000000031b6980 = c0000000002532f0=20 [ 105.121845] GPR24: 0000000000000001 0000000000000000 0000000000000006 = 0000000000000002=20 [ 105.121845] GPR28: c0000007fc006898 0000000000000000 00000000050a0002 = 00000000050a0002=20 [ 105.121945] NIP [c0000000000d5068] icp_hv_eoi+0xf8/0x120 [ 105.121953] LR [c0000000000d5064] icp_hv_eoi+0xf4/0x120 [ 105.121961] Call Trace: [ 105.121965] [c000000004c87cc0] [c0000000000d5064] = icp_hv_eoi+0xf4/0x120 (unreliable) [ 105.121976] [c000000004c87d40] [c000000000254eac] = handle_fasteoi_irq+0x16c/0x350 [ 105.121987] [c000000004c87d70] [c0000000002533b0] = resend_irqs+0xc0/0x190 [ 105.121997] [c000000004c87db0] [c00000000018b690] = tasklet_action_common.isra.0+0x150/0x430 [ 105.122007] [c000000004c87e20] [c00000000018aafc] = handle_softirqs+0x17c/0x4f0 [ 105.122017] [c000000004c87f10] [c00000000018aed8] = run_ksoftirqd+0x68/0xb0 [ 105.122025] [c000000004c87f30] [c0000000001ca460] = smpboot_thread_fn+0x1e0/0x250 [ 105.122036] [c000000004c87f90] [c0000000001bf4a4] kthread+0x134/0x140 [ 105.122047] [c000000004c87fe0] [c00000000000ded8] = start_kernel_thread+0x14/0x18 [ 105.122056] Code: 48bc88c1 60000000 e9210068 4bffff9c 7c661b78 = 3c82ff40 3c62ff85 7fc5f378 3884ca50 38637628 48171b85 60000000 = <0fe00000> 38210080 7be34622 e8010010=20 [ 105.122094] ---[ end trace 0000000000000000 ]=E2=80=94 Regards, Venkat.=