On Tue, Jan 02, 2024 at 11:22:53AM -0800, Kuppuswamy Sathyanarayanan wrote:
> On 12/6/2023 2:42 PM, Bjorn Helgaas wrote:
> > From: Bjorn Helgaas <bhelg...@google.com>
> >
> > When a device with AER detects an error, it logs error information in its
> > own AER Error Status registers. It may send an Error Message to the Root
> > Port (RCEC in the case of an RCiEP), which logs the fact that an Error
> > Message was received (Root Error Status) and the Requester ID of the
> > message source (Error Source Identification).
> >
> > aer_print_port_info() prints the Requester ID from the Root Port Error
> > Source in the usual Linux "bb:dd.f" format, but when find_source_device()
> > finds no error details in the hierarchy below the Root Port, it printed the
> > raw Requester ID without decoding it.
> >
> > Decode the Requester ID in the usual Linux format so it matches other
> > messages.
> >
> > Sample message changes:
> >
> > - pcieport 0000:00:1c.5: AER: Correctable error received: 0000:00:1c.5
> > - pcieport 0000:00:1c.5: AER: can't find device of ID00e5
> > + pcieport 0000:00:1c.5: AER: Correctable error message received from
> > 0000:00:1c.5
> > + pcieport 0000:00:1c.5: AER: found no error details for 0000:00:1c.5
> >
> > Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
>
> Except for the suggestion given below, it looks good to me.
>
> Reviewed-by: Kuppuswamy Sathyanarayanan
> <sathyanarayanan.kuppusw...@linux.intel.com>
Thanks for taking a look!
> > @@ -740,7 +740,7 @@ static void aer_print_port_info(struct pci_dev *dev,
> > struct aer_err_info *info)
> > u8 bus = info->id >> 8;
> > u8 devfn = info->id & 0xff;
> >
> > - pci_info(dev, "%s%s error received: %04x:%02x:%02x.%d\n",
> > + pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d\n",
> > info->multi_error_valid ? "Multiple " : "",
> > aer_error_severity_string[info->severity],
> > pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn),
> > @@ -929,7 +929,12 @@ static bool find_source_device(struct pci_dev *parent,
> > pci_walk_bus(parent->subordinate, find_device_iter, e_info);
> >
> > if (!e_info->error_dev_num) {
> > - pci_info(parent, "can't find device of ID%04x\n", e_info->id);
> > + u8 bus = e_info->id >> 8;
> > + u8 devfn = e_info->id & 0xff;
>
> You can use PCI_BUS_NUM(e_info->id) for getting bus number. Since
> you are extracting this info in more than one place, maybe you can
> also define a macro PCI_DEVFN(id) (following PCI_BUS_NUM()).
Thanks, both good ideas.
We already have a PCI_DEVFN() that *combines* slot + func into devfn,
so we'd have to come up with a different name.
I'll add a patch to use PCI_BUS_NUM() in the two places here and in
pme.c.
I think I'll wait with these until after the v6.7 release.
> > + pci_info(parent, "found no error details for
> > %04x:%02x:%02x.%d\n",
> > + pci_domain_nr(parent->bus), bus, PCI_SLOT(devfn),
> > + PCI_FUNC(devfn));
> > return false;
> > }
> > return true;
>
> --
> Sathyanarayanan Kuppuswamy
> Linux Kernel Developer
