Message-ID: <20211021163021.r4ekhfol42ftw5zw@theprophet>
Date:   Thu, 21 Oct 2021 22:00:21 +0530
From:   Naveen Naidu <naveennaidu479@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     bhelgaas@...gle.com, ruscur@...sell.cc, oohall@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v4 1/8] PCI/AER: Remove ID from aer_agent_string[]

On 20/10, Bjorn Helgaas wrote:
> On Tue, Oct 05, 2021 at 10:48:08PM +0530, Naveen Naidu wrote:
> > Currently, we do not print the "id" field in the AER error logs. Yet the
> > aer_agent_string[] has the word "id" in it. The AER error log looks
> > like:
> > 
> >   pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver ID)
> > 
> > Without the "id" field in the error log, The aer_agent_string[]
> > (eg: "Receiver ID") does not make sense. A user reading the
> > aer_agent_string[] in the log, might inadvertently look for an "id"
> > field and not finding it might lead to confusion.
> > 
> > Remove the "ID" from the aer_agent_string[].
> > 
> > The following are sample dummy errors inject via aer-inject.
> 
> I like this, and the problem it fixes was my fault because
> these "ID" strings should have been removed by 010caed4ccb6.
> 
> If it's straightforward enough, it would be nice to have the
> aer-inject command line here in the commit log to make it easier
> for people to play with this.
>

Thank you for the review. Do you mean something like:

The following sample dummy errors are injected via aer-inject via the
following steps:

  1. The steps to compile the aer-inject tool is mentioned in (Section
     4. Software error inject) of the document [1]

     [1]: https://www.kernel.org/doc/Documentation/PCI/pcieaer-howto.txt

     Make sure to place the aer-inject executable at the home directory
     of the qemu system or at any other place.

  2. Emulate a PCIE architecture using qemu, A sample looks like
     following:
     
		qemu-system-x86_64 -kernel ../linux/arch/x86_64/boot/bzImage \
        -initrd  buildroot-build/images/rootfs.cpio.gz \
        -append "console=ttyS0"  \
        -enable-kvm -nographic \
        -M q35 \
        -device pcie-root-port,bus=pcie.0,id=rp1,slot=1 \
        -device pcie-pci-bridge,id=br1,bus=rp1 \
        -device e1000,bus=br1,addr=8
       
    Note that the PCIe features are available only when using the 
    'q35' Machine [2]
    [2]: https://github.com/qemu/qemu/blob/master/docs/pcie.txt

  3. Once the qemu system starts up, create a sample aer-file or use any
     example aer file from [3]

     [3]:
     https://git.kernel.org/pub/scm/linux/kernel/git/gong.chen/aer-inject.git/tree/examples

  4. Inject any aer-error using
      
      ./aer-inject aer-file

This does look a tad bit longer for a commit log so I am unsure if you
would like to have it there. If you are okay with it, I would be happy
to add it to that :)

> > Before
> > =======
> > 
> > In 010caed4ccb6 ("PCI/AER: Decode Error Source Requester ID"),
> > the "id" field was removed from the AER error logs, so currently AER
> > logs look like:
> > 
> >   pcieport 0000:00:03.0: AER: Corrected error received: 0000:00:03:0
> >   pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver ID) <--- no id field
> >   pcieport 0000:00:03.0:   device [1b36:000c] error status/mask=00000040/0000e000
> >   pcieport 0000:00:03.0:    [ 6] BadTLP
> > 
> > After
> > ======
> > 
> >   pcieport 0000:00:03.0: AER: Corrected error received: 0000:00:03.0
> >   pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver)
> >   pcieport 0000:00:03.0:   device [1b36:000c] error status/mask=00000040/0000e000
> >   pcieport 0000:00:03.0:    [ 6] BadTLP
> > 
> > Signed-off-by: Naveen Naidu <naveennaidu479@...il.com>
> > ---
> >  drivers/pci/pcie/aer.c | 10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> > index 9784fdcf3006..241ff361b43c 100644
> > --- a/drivers/pci/pcie/aer.c
> > +++ b/drivers/pci/pcie/aer.c
> > @@ -516,10 +516,10 @@ static const char *aer_uncorrectable_error_string[] = {
> >  };
> >  
> >  static const char *aer_agent_string[] = {
> > -	"Receiver ID",
> > -	"Requester ID",
> > -	"Completer ID",
> > -	"Transmitter ID"
> > +	"Receiver",
> > +	"Requester",
> > +	"Completer",
> > +	"Transmitter"
> >  };
> >  
> >  #define aer_stats_dev_attr(name, stats_array, strings_array,		\
> > @@ -703,7 +703,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
> >  	const char *level;
> >  
> >  	if (!info->status) {
> > -		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n",
> > +		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent)\n",
> >  			aer_error_severity_string[info->severity]);
> >  		goto out;
> >  	}
> > -- 
> > 2.25.1
> > 
> > _______________________________________________
> > Linux-kernel-mentees mailing list
> > Linux-kernel-mentees@...ts.linuxfoundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

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