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Wed, 04 Feb 2026 22:38:07 +0000 Received: from smtpav03.wdc07v.mail.ibm.com (smtpav03.wdc07v.mail.ibm.com [10.39.53.230]) by smtprelay02.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 614Mc4Xj23331574 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 4 Feb 2026 22:38:05 GMT Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B878B58078; Wed, 4 Feb 2026 22:38:04 +0000 (GMT) Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2A48D58077; Wed, 4 Feb 2026 22:38:04 +0000 (GMT) Received: from ltcrain119-lp4.ltc.tadn.ibm.com (unknown [9.5.7.39]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Wed, 4 Feb 2026 22:38:04 +0000 (GMT) From: wenxiong@linux.ibm.com To: linuxppc-dev@lists.ozlabs.org Cc: maddy@linux.ibm.com, haren@linux.ibm.com, tyreld@linux.ibm.com, Wen Xiong Subject: [PATCH V2] error path improvement in dlpar add Date: Wed, 4 Feb 2026 16:38:44 -0600 Message-ID: <20260204223844.11441-1-wenxiong@linux.ibm.com> X-Mailer: git-send-email 2.47.3 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=UdxciaSN c=1 sm=1 tr=0 ts=6983ca50 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=WJWy47JjtfI5XqIBqRAA:9 X-Proofpoint-GUID: SiX7SNamduifgSWnirZfFLCipQffqRzC X-Proofpoint-ORIG-GUID: SiX7SNamduifgSWnirZfFLCipQffqRzC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjA0MDE3MSBTYWx0ZWRfX+ijm3JKuQujk hzBwRktY0shRCnKHWNbH15n8OIaccjLqBkm11Oyf8fFTpznqCXNIjCw3zUGuAeXDUmvkZ/3ixXP RN0kAuOwT3Taa8s7jxzX9GC+uK9wfDGX9cDeLtltY6KZHQvjeUiGWGvxDKD4EP6xgJosNfeL2SN q28lrVbTarloNCbECCFZ+eVb+6zVSCATBMmcE/TaR0nSJe8xMG99x7z/vYhsHPHiCRFfqtA+k9V aQZXwISBUGfsVAUaCFFhu7t1YrrQlna2Hzx7jjrgQkwtptxvjmOAyGfi74qsCNImdgVi/wIwapw E3N4mEWid8BpIBUuohrVQAQswWI3/A3O2Spllmg+Ed9ApEkKR53kxzzLePdeVlyrQUyOvMxNFFM 6AsbRHFqDKAZQZdL+fzxGJCmlVlgImMlErkA/Iuz350+dKoBBqgsoDuxjkgxdd3S5RaysHtkRF7 WVyx7CRfv6Mkpt9qlUA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-04_07,2026-02-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 bulkscore=0 spamscore=0 phishscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2602040171 From: Wen Xiong When doing a dlpar adding a device back, expect not loading device driver if claiming pci resource failed. Validating PHB DLPAR capability...yes. [ 4928.798012] pci_bus 0187:c0: root bus resource [bus c0-ff] [ 4928.798038] pci 0187:c0:00.0: No hypervisor support for SR-IOV on this device, IOV BARs disabled. [ 4928.815867] pci 0187:c0:00.0: BAR 0 [mem 0xb0020000-0xb0027fff 64bit]: can't claim; no compatible bridge window ---> Expect to exit if claiming resources fails(BAR0) [ 4928.815899] pci 0187:c0:00.0: ROM [mem 0xb0000000-0xb001ffff]: can't claim; no compatible bridge window --->Expect to exit if claiming resources fails(ROM), don't load device driver anymore, showed "dlpar add failed" [ 4928.815913] pci 0187:c0:00.0: ROM [mem 0x40000000000-0x4000001ffff]: assigned [ 4928.815923] pci 0187:c0:00.0: BAR 0 [mem 0x40800000000-0x40800007fff 64bit]: assigned [ 4928.816220] pci 0187:c0:00.0: BAR 0: error updating (0x00000004 != 0xffffffff) [ 4928.816364] pci 0187:c0:00.0: BAR 0: error updating (high 0x00060238 != 0xffffffff) [ 4928.816839] pci 0187:c0:00.0: ibm,query-pe-dma-windows(53) b00000 8000000 20000187 returned -3, lb=0 ps=0 wn=0 [ 4928.816855] pci 0187:c0:00.0: spapr_tce_init_table_group: query_ddw failed [ 4928.816871] pci 0187:c0:00.0: Adding to iommu group 1 [ 4928.816952] pci 0187:c0:00.0: of_irq_parse_pci: no interrupt-map found, INTx interrupts not available [ 4928.818135] nvme 0187:c0:00.0: ibm,query-pe-dma-windows(53) b00000 8000000 20000187 returned -3, lb=0 ps=0 wn=0 [ 4928.818284] nvme nvme1: pci function 0187:c0:00.0 [ 4928.819321] rpaphp: Slot [U78DB.ND0.WZS08E2-P1-C7] registered [ 4928.819338] rpadlpar_io: slot PHB 391 added With adding error path checking, didn't load the device driver anymore if claiming resources failed. Validating PHB DLPAR capability...yes. [ 260.414453] PCI host bridge /pci@800000020000187 ranges: [ 260.414473] MEM 0x0000040000000000..0x0000040007ffffff -> 0x00000000b8000000 [ 260.414480] MEM 0x0000040800000000..0x0000040fffffffff -> 0x0006023800000000 [ 260.414915] PCI host bridge to bus 0187:c0 [ 260.414922] pci_bus 0187:c0: root bus resource [mem 0x40000000000-0x40007ffffff] (bus address [0xb8000000-0xbfffffff]) [ 260.414929] pci_bus 0187:c0: root bus resource [mem 0x40800000000-0x40fffffffff 64bit] (bus address [0x6023800000000-0x6023fffffffff]) [ 260.414936] pci_bus 0187:c0: root bus resource [bus c0-ff] [ 260.414948] pci 0187:c0:00.0: No hypervisor support for SR-IOV on this device, IOV BARs disabled. [ 260.423439] pci 0187:c0:00.0: BAR 0 [mem 0xb0020000-0xb0027fff 64bit]: can't claim; no compatible bridge window [ 260.423463] after pci_cliam_Resource=-22 ----> pci_claim_resources fails. [ 260.423471] rpadlpar_io: slot PHB 391 added failed rc=-5 -----> added failed. Signed-off-by: Wen Xiong Reviewed-by: Haren Myneni Reviewed-by: Tyrel Datwyler --- arch/powerpc/include/asm/pci.h | 4 ++-- arch/powerpc/kernel/pci-common.c | 23 +++++++++++++++++----- arch/powerpc/kernel/pci-hotplug.c | 5 ++++- arch/powerpc/platforms/pseries/pci_dlpar.c | 3 ++- drivers/pci/hotplug/rpadlpar_core.c | 7 ++++++- 5 files changed, 32 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h index 46a9c4491ed0..ebeb912a92bf 100644 --- a/arch/powerpc/include/asm/pci.h +++ b/arch/powerpc/include/asm/pci.h @@ -86,9 +86,9 @@ extern void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type); #define HAVE_PCI_LEGACY 1 -extern void pcibios_claim_one_bus(struct pci_bus *b); +extern int pcibios_claim_one_bus(struct pci_bus *b); -extern void pcibios_finish_adding_to_bus(struct pci_bus *bus); +extern int pcibios_finish_adding_to_bus(struct pci_bus *bus); extern void pcibios_resource_survey(void); diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index eac84d687b53..b16f43c7f02e 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -1446,10 +1446,11 @@ void __init pcibios_resource_survey(void) * rest of the code later, for now, keep it as-is as our main * resource allocation function doesn't deal with sub-trees yet. */ -void pcibios_claim_one_bus(struct pci_bus *bus) +int pcibios_claim_one_bus(struct pci_bus *bus) { struct pci_dev *dev; struct pci_bus *child_bus; + int ret = 0; list_for_each_entry(dev, &bus->devices, bus_list) { struct resource *r; @@ -1462,15 +1463,20 @@ void pcibios_claim_one_bus(struct pci_bus *bus) pr_debug("PCI: Claiming %s: Resource %d: %pR\n", pci_name(dev), i, r); - if (pci_claim_resource(dev, i) == 0) + ret = pci_claim_resource(dev, i); + if (ret == 0) continue; + else + return ret; pci_claim_bridge_resource(dev, i); } } list_for_each_entry(child_bus, &bus->children, node) - pcibios_claim_one_bus(child_bus); + ret = pcibios_claim_one_bus(child_bus); + + return ret; } EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); @@ -1481,14 +1487,19 @@ EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); * added to a bus, this include calling it for a PHB that is just * being added */ -void pcibios_finish_adding_to_bus(struct pci_bus *bus) +int pcibios_finish_adding_to_bus(struct pci_bus *bus) { + int ret = 0; + pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", pci_domain_nr(bus), bus->number); /* Allocate bus and devices resources */ pcibios_allocate_bus_resources(bus); - pcibios_claim_one_bus(bus); + ret = pcibios_claim_one_bus(bus); + if (ret) + return ret; + if (!pci_has_flag(PCI_PROBE_ONLY)) { if (bus->self) pci_assign_unassigned_bridge_resources(bus->self); @@ -1498,6 +1509,8 @@ void pcibios_finish_adding_to_bus(struct pci_bus *bus) /* Add new devices to global lists. Register in proc, sysfs. */ pci_bus_add_devices(bus); + + return ret; } EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c index 6f444d0822d8..133ce03fdd82 100644 --- a/arch/powerpc/kernel/pci-hotplug.c +++ b/arch/powerpc/kernel/pci-hotplug.c @@ -140,6 +140,7 @@ void pci_hp_add_devices(struct pci_bus *bus) struct pci_dev *dev; struct pci_controller *phb; struct device_node *dn = pci_bus_to_OF_node(bus); + int ret = 0; if (!dn) return; @@ -176,6 +177,8 @@ void pci_hp_add_devices(struct pci_bus *bus) for_each_pci_bridge(dev, bus) max = pci_scan_bridge(bus, dev, max, 1); } - pcibios_finish_adding_to_bus(bus); + ret = pcibios_finish_adding_to_bus(bus); + if (ret) + pr_err("Unable to add hotplug pci device!\n"); } EXPORT_SYMBOL_GPL(pci_hp_add_devices); diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c index 8c77ec7980de..2b78faba40f6 100644 --- a/arch/powerpc/platforms/pseries/pci_dlpar.c +++ b/arch/powerpc/platforms/pseries/pci_dlpar.c @@ -58,7 +58,8 @@ struct pci_controller *init_phb_dynamic(struct device_node *dn) pseries_eeh_init_edev_recursive(PCI_DN(dn)); pcibios_scan_phb(phb); - pcibios_finish_adding_to_bus(phb->bus); + if (pcibios_finish_adding_to_bus(phb->bus)) + return NULL; return phb; } diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c index 980bb3afd092..4c507dd04fa1 100644 --- a/drivers/pci/hotplug/rpadlpar_core.c +++ b/drivers/pci/hotplug/rpadlpar_core.c @@ -240,8 +240,10 @@ static int dlpar_add_phb(char *drc_name, struct device_node *dn) } phb = init_phb_dynamic(dn); - if (!phb) + if (!phb) { + pr_err("Unable to add hotplug slot %s\n", drc_name); return -EIO; + } if (rpaphp_add_slot(dn)) { printk(KERN_ERR "%s: unable to add hotplug slot %s\n", @@ -311,6 +313,9 @@ int dlpar_add_slot(char *drc_name) } of_node_put(dn); + if (rc) + goto exit; + printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); exit: mutex_unlock(&rpadlpar_mutex); -- 2.47.3