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McKenney" , Mahesh J Salgaonkar , Oliver O'Halloran , Kai-Heng Feng , Keith Busch , Robert Richter , Terry Bowman , Shiju Jose , Dave Jiang , LKML , linuxppc-dev@lists.ozlabs.org, Bjorn Helgaas Subject: Re: [PATCH v6 02/16] PCI/DPC: Log Error Source ID only when valid Message-ID: <20250520140535.GA1291979@bhelgaas> 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-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, May 20, 2025 at 01:28:02PM +0300, Ilpo Järvinen wrote: > On Mon, 19 May 2025, Bjorn Helgaas wrote: > > DPC Error Source ID is only valid when the DPC Trigger Reason indicates > > that DPC was triggered due to reception of an ERR_NONFATAL or ERR_FATAL > > Message (PCIe r6.0, sec 7.9.14.5). > > > > When DPC was triggered by ERR_NONFATAL (PCI_EXP_DPC_STATUS_TRIGGER_RSN_NFE) > > or ERR_FATAL (PCI_EXP_DPC_STATUS_TRIGGER_RSN_FE) from a downstream device, > > log the Error Source ID (decoded into domain/bus/device/function). Don't > > print the source otherwise, since it's not valid. > > > > For DPC trigger due to reception of ERR_NONFATAL or ERR_FATAL, the dmesg > > logging changes: > > > > - pci 0000:00:01.0: DPC: containment event, status:0x000d source:0x0200 > > - pci 0000:00:01.0: DPC: ERR_FATAL detected > > + pci 0000:00:01.0: DPC: containment event, status:0x000d, ERR_FATAL received from 0000:02:00.0 > > > > and when DPC triggered for other reasons, where DPC Error Source ID is > > undefined, e.g., unmasked uncorrectable error: > > > > - pci 0000:00:01.0: DPC: containment event, status:0x0009 source:0x0200 > > - pci 0000:00:01.0: DPC: unmasked uncorrectable error detected > > + pci 0000:00:01.0: DPC: containment event, status:0x0009: unmasked uncorrectable error detected > > > > Previously the "containment event" message was at KERN_INFO and the > > "%s detected" message was at KERN_WARNING. Now the single message is at > > KERN_WARNING. > > > > Signed-off-by: Bjorn Helgaas > > --- > > drivers/pci/pcie/dpc.c | 45 ++++++++++++++++++++++++++---------------- > > 1 file changed, 28 insertions(+), 17 deletions(-) > > > > diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c > > index fe7719238456..315bf2bfd570 100644 > > --- a/drivers/pci/pcie/dpc.c > > +++ b/drivers/pci/pcie/dpc.c > > @@ -261,25 +261,36 @@ void dpc_process_error(struct pci_dev *pdev) > > struct aer_err_info info = { 0 }; > > > > pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); > > - pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source); > > - > > - pci_info(pdev, "containment event, status:%#06x source:%#06x\n", > > - status, source); > > > > reason = status & PCI_EXP_DPC_STATUS_TRIGGER_RSN; > > - ext_reason = status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT; > > - pci_warn(pdev, "%s detected\n", > > - (reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_UNCOR) ? > > - "unmasked uncorrectable error" : > > - (reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_NFE) ? > > - "ERR_NONFATAL" : > > - (reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_FE) ? > > - "ERR_FATAL" : > > - (ext_reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_RP_PIO) ? > > - "RP PIO error" : > > - (ext_reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_SW_TRIGGER) ? > > - "software trigger" : > > - "reserved error"); > > + > > + switch (reason) { > > + case PCI_EXP_DPC_STATUS_TRIGGER_RSN_UNCOR: > > + pci_warn(pdev, "containment event, status:%#06x: unmasked uncorrectable error detected\n", > > + status); > > + break; > > + case PCI_EXP_DPC_STATUS_TRIGGER_RSN_NFE: > > + case PCI_EXP_DPC_STATUS_TRIGGER_RSN_FE: > > + pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, > > + &source); > > + pci_warn(pdev, "containment event, status:%#06x, %s received from %04x:%02x:%02x.%d\n", > > + status, > > + (reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_FE) ? > > + "ERR_FATAL" : "ERR_NONFATAL", > > + pci_domain_nr(pdev->bus), PCI_BUS_NUM(source), > > + PCI_SLOT(source), PCI_FUNC(source)); > > + return; > > + case PCI_EXP_DPC_STATUS_TRIGGER_RSN_IN_EXT: > > + ext_reason = status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT; > > + pci_warn(pdev, "containment event, status:%#06x: %s detected\n", > > + status, > > + (ext_reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_RP_PIO) ? > > + "RP PIO error" : > > + (ext_reason == PCI_EXP_DPC_STATUS_TRIGGER_RSN_SW_TRIGGER) ? > > + "software trigger" : > > + "reserved error"); > > + break; > > + } > > > > /* show RP PIO error detail information */ > > if (pdev->dpc_rp_extensions && > > After adding that switch (reason) there, wouldn't it make sense to move > also the code from the if blocks into the case blocks? That if > conditions check for reason anyway so those if branches would naturally > belong under one of the cases each. Great idea, thanks!