[PATCH 1/1] PCI/DPC: Fix TLP Prefix register reading offset

[Ilpo Järvinen]

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 at linux.intel.com>

-- 
 i.