linux-kernel - Re: [PATCH 1/1] PCI/DPC: Fix TLP Prefix register reading offset

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Date: Mon, 22 Jan 2024 14:20:25 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>
cc: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>, 
    Oliver O'Halloran <oohall@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
    Keith Busch <kbusch@...nel.org>, Dongdong Liu <liudongdong3@...wei.com>, 
    linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] PCI/DPC: Fix TLP Prefix register reading offset

On Fri, 19 Jan 2024, Bjorn Helgaas wrote:

> On Thu, Jan 18, 2024 at 01:08:15PM +0200, Ilpo Järvinen wrote:
> > The TLP Prefix Log Register consists of multiple DWORDs (PCIe r6.1 sec
> > 7.9.14.13) but the loop in dpc_process_rp_pio_error() keeps reading
> > from the first DWORD. Add the iteration count based offset calculation
> > into the config read.
> 
> So IIUC the user-visible bug is that we print only the first PIO TLP
> Prefix (duplicated several times), and we never print the second,
> third, etc Prefixes, right?

Yes.

> I wish we could print them all in a single pci_err(), as we do for the
> TLP Header Log, instead of dribbling them out one by one.

I've also done some work towards consolidating AER and DPC TLP 
Header/Prefix Log handling which is when I found this bug (the reading 
side is already done but printing is still pending).

> > Fixes: f20c4ea49ec4 ("PCI/DPC: Add eDPC support")
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.