linux-kernel - Re: [PATCH v15 3/5] PCI/EDR: Export AER, DPC and error recovery functions

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Message-ID: <20200226214855.GA175196@google.com>
Date:   Wed, 26 Feb 2020 15:48:55 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com
Subject: Re: [PATCH v15 3/5] PCI/EDR: Export AER, DPC and error recovery
 functions

On Wed, Feb 26, 2020 at 01:26:09PM -0800, Kuppuswamy Sathyanarayanan wrote:
> On 2/26/20 1:13 PM, Bjorn Helgaas wrote:
> > On Wed, Feb 26, 2020 at 11:30:43AM -0800, Kuppuswamy Sathyanarayanan wrote:
> > > On 2/25/20 5:02 PM, Bjorn Helgaas wrote:
> > > > On Thu, Feb 13, 2020 at 10:20:15AM -0800, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
> > > > > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> > > > > ...

> > > > > diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> > > > > index 99fca8400956..acae12dbf9ff 100644
> > > > > --- a/drivers/pci/pcie/dpc.c
> > > > > +++ b/drivers/pci/pcie/dpc.c
> > > > > @@ -15,15 +15,9 @@
> > > > >    #include <linux/pci.h>
> > > > >    #include "portdrv.h"
> > > > > +#include "dpc.h"
> > > > >    #include "../pci.h"
> > > > > -struct dpc_dev {
> > > > > -	struct pci_dev		*pdev;
> > > > > -	u16			cap_pos;
> > > > > -	bool			rp_extensions;
> > > > > -	u8			rp_log_size;
> > > > > -};

> > > > Adding dpc.h shouldn't be in this patch because there's no need for a
> > > > separate dpc.h file yet -- it's only included this one place.  I'm not
> > > > positive a dpc.h is needed at all -- see comments on patch [4/5].

> > > Yes, if we use pdev in dpc functions used by EDR code, we should
> > > not need it.

> > I think struct dpc_dev might be more trouble than it's worth.  I
> > attached a possible patch at the end that folds the 25 bits of
> > DPC-related info into the struct pci_dev and gets rid of struct
> > dpc_dev completely.  I compiled it but haven't tested it.

> That would solve most of my export issues. Do you want me
> to add it to my patch list or merge it separately.

If you want to use that, I would merge it first, followed by the error
clearing cleanup, followed by the other EDR stuff.

Bjorn