linux-kernel - Re: [PATCH v4 1/1] PCI: endpoint: pci-epf-vntb: Fix transfer failure for fixed size BARs

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Date: Tue, 30 Jan 2024 15:30:30 -0500
From: Frank Li <Frank.li@....com>
To: Niklas Cassel <cassel@...nel.org>
Cc: mani@...nel.org, allenbh@...il.com, bhelgaas@...gle.com,
	dave.jiang@...el.com, imx@...ts.linux.dev, jdmason@...zu.us,
	kishon@...nel.org, kw@...ux.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, lpieralisi@...nel.org,
	ntb@...ts.linux.dev
Subject: Re: [PATCH v4 1/1] PCI: endpoint: pci-epf-vntb: Fix transfer failure
 for fixed size BARs

On Tue, Jan 30, 2024 at 08:43:24PM +0100, Niklas Cassel wrote:
> On Thu, Jan 25, 2024 at 10:33:19AM -0500, Frank Li wrote:
> > On Mon, Jan 08, 2024 at 10:10:15AM -0500, Frank Li wrote:
> > > For the inbound MEM/IO TLPs, iATU on the endpoint expects the target
> > > address to be aligned to the size of the BAR. For configurable BARs, there
> > > is no issue because both host and endpoint will know the exact size of the
> > > BAR region. But for fixed size BARs available in some controllers, if the
> > > BAR size advertised by the endpoint is not same as of the actual BAR size
> > > used in the controller, then the MEM/IO TLPs generated by the host will not
> > > be translated properly by the endpoint iATU.
> > > 
> > > So if the fixed size BARs are available in endpoint controllers, always use
> > > the actual BAR size.
> > > 
> > > This only fixes doorbell (DB) BAR. A similar fix is needed for memory map
> > > windows(MW) BARs.
> > > 
> > > Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP")
> > > Cc: stable@...r.kernel.org
> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > ---
> > 
> > @lpieralisi:
> > 
> > 	Could you please pick this fix patch?
> 
> 
> Hello Frank, Lorenzo, Mani,
> 
> 
> Frank, sorry for not seeing this patch earlier.
> 
> Could you please see if this series fixes your issue:
> https://lore.kernel.org/linux-pci/20240130193214.713739-1-cassel@kernel.org/T/#t
> 
> I think it is nicer since:
> 1) It doesn't add copy pasted code from pci-epf-test.c to pci-epf-vntb.c.
> 2) I would expect it to handle both the doorbell BAR and the MW BARs.

Agree! Thanks

Frank
> 
> 
> Kind regards,
> Niklas