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Mon, 3 Nov 2025 11:23:12 GMT Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 99B2158056; Mon, 3 Nov 2025 11:23:11 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B506858052; Mon, 3 Nov 2025 11:23:08 +0000 (GMT) Received: from [9.111.82.153] (unknown [9.111.82.153]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Mon, 3 Nov 2025 11:23:08 +0000 (GMT) Message-ID: <958ef380be4ea488698fab05245d631998c32a48.camel@linux.ibm.com> Subject: Re: [PATCH v5 1/2] PCI: Fix isolated PCI function probing with ARI and SR-IOV From: Niklas Schnelle To: Huacai Chen Cc: Bjorn Helgaas , Jan Kiszka , Bibo Mao , linux-s390 , loongarch@lists.linux.dev, Farhan Ali , Matthew Rosato , Tianrui Zhao , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , Christian Borntraeger , Gerd Bayer , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org Date: Mon, 03 Nov 2025 12:23:08 +0100 In-Reply-To: References: <20251029-ari_no_bus_dev-v5-0-d9a5eab67ed0@linux.ibm.com> <20251029-ari_no_bus_dev-v5-1-d9a5eab67ed0@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=StmdKfO0 c=1 sm=1 tr=0 ts=690890a3 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=CVEPJ6nH_zdpVceZYQoA:9 a=QEXdDO2ut3YA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: 7rFSlMeYVcIwghoP9LHcpFeesyb62QRC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTAxMDAxOCBTYWx0ZWRfXzEBdH0xuU4zj kHxnQKdqD9smWYR2WndNTSz+t31izFnHZQIYQyT1HN253o9z7KWAhyAN9HOw1UrYAhFfCJw7FHb +Q9XaKQT+pePHX1Ap5hceq0vmF3WpgKSMcMPb75lO/6+Juq2OoHTrRGtxRGCDcWjkPHjJoKXfnw Mb2OJrl7S9jXuHpgA60wpqc0VUXU5UgHdpCP2C83XF/HaqFoKWcQJ/RfLilK27dDUAZnQjV0ac9 6cV7yp16DBpEQi7uuyclz1DGgilzohzA/yxgr8jV//RynUFQXQGqPk/YoMnsXlsAPyYPyxdbPzj QryyJMXS/X6RqOEf2owKmK2EgV+fUj2Wv2mkMtEJ4Trq6yLTNvSQNmesVg55/q31bw1zEDjewBX EvEv4miN9KZOKQloR8SIanSJF6Op9w== X-Proofpoint-GUID: cHXcDtfakFCIOP8Neov1l0i0PTXzlcoR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-03_01,2025-10-29_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 phishscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 bulkscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511010018 On Mon, 2025-11-03 at 17:50 +0800, Huacai Chen wrote: > Hi, Niklas, >=20 > On Wed, Oct 29, 2025 at 5:42=E2=80=AFPM Niklas Schnelle wrote: > >=20 > > When the isolated PCI function probing mechanism is used in conjunction > > with ARI or SR-IOV it may not find all available PCI functions. In the > > case of ARI the problem is that next_ari_fn() always returns -ENODEV if > > dev is NULL and thus if fn 0 is missing the scan stops. > >=20 > > For SR-IOV things are more complex. Here the problem is that the check > > for multifunction may fail. One example where this can occur is if the > > first passed-through function is a VF with devfn 8. Now in > > pci_scan_slot() this means it is fn 0 and thus multifunction doesn't ge= t > > set. Since VFs don't get multifunction set via PCI_HEADER_TYPE_MFD it > > remains unset and probing stops even if there is a devfn 9. > >=20 > > Now at the moment both of these issues are hidden on s390. The first on= e > > because ARI is detected as disabled as struct pci_bus's self is NULL > > even though firmware does enable and use ARI. The second issue is hidde= n > > as a side effect of commit 25f39d3dcb48 ("s390/pci: Ignore RID for > > isolated VFs"). This is because VFs are either put on their own virtual > > bus if the parent PF is not passed-through to the same instance or VFs > > are hotplugged once SR-IOV is enabled on the parent PF and then > > pci_scan_single_device() is used. > >=20 > > Still especially the first issue prevents correct detection of ARI and > > the second might be a problem for other users of isolated function > > probing. Fix both issues by keeping things as simple as possible. If > > isolated function probing is enabled simply scan every possible devfn. > I'm very sorry, but applying this patch on top of commit a02fd05661d7 > ("PCI: Extend isolated function probing to LoongArch") we fail to > boot. >=20 > Boot log: > [ 10.365340] megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 > 00:01:03 EST 2006) > [ 10.372628] megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST = 2006) > [ 10.379564] megasas: 07.734.00.00-rc1 > [ 10.383222] mpt3sas version 54.100.00.00 loaded > [ 10.388304] nvme nvme0: pci function 0000:08:00.0 > [ 10.395088] Freeing initrd memory: 45632K > [ 10.469822] ------------[ cut here ]------------ > [ 10.474409] WARNING: CPU: 0 PID: 247 at drivers/ata/libahci.c:233 > ahci_enable_ahci+0x64/0xb8 > [ 10.482804] Modules linked in: > [ 10.485838] CPU: 0 UID: 0 PID: 247 Comm: kworker/0:11 Not tainted > 6.18.0-rc3 #1 PREEMPT(full) > [ 10.494397] Hardware name: To be filled by O.E.M.To be fill To be > filled by O.E.M.To be fill/To be filled by O.E.M.To be fill, BIOS > Loongson-UDK2018-V4.0. > [ 10.508139] Workqueue: events work_for_cpu_fn > [ 10.512468] pc 900000000103be2c ra 900000000103be28 tp > 900000010ae44000 sp 900000010ae47be0 > [ 10.520769] a0 0000000000000000 a1 00000000000000b0 a2 > 0000000000000001 a3 9000000001810e0c > [ 10.529069] a4 9000000002343e20 a5 0000000000000001 a6 > 0000000000000010 a7 0000000000000000 > [ 10.537373] t0 d10951fa66920f31 t1 d10951fa66920f31 t2 > 0000000000001280 t3 000000000674c000 > [ 10.545673] t4 0000000000000000 t5 0000000000000000 t6 > 9000000008002480 t7 00000000000000b4 > [ 10.553972] t8 90000001055eab90 u0 900000010ae47b68 s9 > 9000000002221a50 s0 0000000000000000 > [ 10.562272] s1 ffff800032435800 s2 0000000000000000 s3 > ffffffff80000000 s4 9000000002221570 > [ 10.570571] s5 0000000000000005 s6 9000000101ccf0b8 s7 > 90000000023dd000 s8 900000010ae47d08 > [ 10.578869] ra: 900000000103be28 ahci_enable_ahci+0x60/0xb8 > [ 10.584665] ERA: 900000000103be2c ahci_enable_ahci+0x64/0xb8 > [ 10.590461] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=3DCC DACM=3DCC -WE) > [ 10.596609] PRMD: 00000004 (PPLV0 +PIE -PWE) > [ 10.600937] EUEN: 00000000 (-FPE -SXE -ASXE -BTE) > [ 10.605698] ECFG: 00071c1d (LIE=3D0,2-4,10-12 VS=3D7) > [ 10.610458] ESTAT: 000c0000 [BRK] (IS=3D ECode=3D12 EsubCode=3D0) > [ 10.615994] PRID: 0014d010 (Loongson-64bit, Loongson-3C6000/S) > [ 10.621875] CPU: 0 UID: 0 PID: 247 Comm: kworker/0:11 Not tainted > 6.18.0-rc3 #1 PREEMPT(full) > [ 10.621877] Hardware name: To be filled by O.E.M.To be fill To be > filled by O.E.M.To be fill/To be filled by O.E.M.To be fill, BIOS > Loongson-UDK2018-V4.0. > [ 10.621878] Workqueue: events work_for_cpu_fn > [ 10.621881] Stack : 900000010ae47848 0000000000000000 > 90000000002436bc 900000010ae44000 > [ 10.621884] 900000010ae47820 900000010ae47828 > 0000000000000000 900000010ae47968 > [ 10.621887] 900000010ae47960 900000010ae47960 > 900000010ae47630 0000000000000001 > [ 10.621890] 0000000000000001 900000010ae47828 > d10951fa66920f31 9000000100414300 > [ 10.621893] 80000000ffffe34d fffffffffffffffe > 000000000000034f 000000000000002f > [ 10.621896] 0000000000000063 0000000000000001 > 000000000674c000 9000000002221a50 > [ 10.621899] 0000000000000000 0000000000000000 > 90000000020b6500 90000000023dd000 > [ 10.621902] 00000000000000e9 0000000000000009 > 0000000000000002 90000000023dd000 > [ 10.621905] 900000010ae47d08 0000000000000000 > 90000000002436d4 0000000000000000 > [ 10.621908] 00000000000000b0 0000000000000004 > 0000000000000000 0000000000071c1d > [ 10.621910] ... > [ 10.621912] Call Trace: > [ 10.621913] [<90000000002436d4>] show_stack+0x5c/0x180 > [ 10.621918] [<900000000023f328>] dump_stack_lvl+0x6c/0x9c > [ 10.621923] [<9000000000266eb8>] __warn+0x80/0x108 > [ 10.621927] [<90000000017d1910>] report_bug+0x158/0x2a8 > [ 10.621932] [<900000000180b610>] do_bp+0x2d0/0x340 > [ 10.621938] [<9000000000241da0>] handle_bp+0x120/0x1c0 > [ 10.621940] [<900000000103be2c>] ahci_enable_ahci+0x64/0xb8 > [ 10.621943] [<900000000103beb8>] ahci_save_initial_config+0x38/0x4d8 > [ 10.621946] [<90000000010391b4>] ahci_init_one+0x354/0x1088 > [ 10.621950] [<9000000000d16cdc>] local_pci_probe+0x44/0xb8 > [ 10.621953] [<9000000000286f78>] work_for_cpu_fn+0x18/0x30 > [ 10.621956] [<900000000028a840>] process_one_work+0x160/0x330 > [ 10.621961] [<900000000028b208>] worker_thread+0x330/0x460 > [ 10.621964] [<9000000000295fdc>] kthread+0x11c/0x138 > [ 10.621968] [<900000000180b740>] ret_from_kernel_thread+0x28/0xa8 > [ 10.621971] [<9000000000241484>] ret_from_kernel_thread_asm+0xc/0x88 > [ 10.621973] >=20 >=20 This looks like a warning telling us that AHCI enable failed / timed out. Do you have Panic on Warn on that this directly causes a boot failure? The only relation I can see with my patch is that maybe this AHCI device wasn't probed before and somehow isn't working? Thanks, Niklas