linux-kernel - Re: [PATCH v17 09/12] PCI/AER: Allow clearing Error Status Register in FF mode

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Date:   Fri, 6 Mar 2020 10:04:01 -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 v17 09/12] PCI/AER: Allow clearing Error Status Register
 in FF mode

On Thu, Mar 05, 2020 at 09:45:46PM -0800, Kuppuswamy, Sathyanarayanan wrote:
> On 3/3/2020 6:36 PM, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
> > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> > 
> > As per PCI firmware specification r3.2 System Firmware Intermediary
> > (SFI) _OSC and DPC Updates ECR
> > (https://members.pcisig.com/wg/PCI-SIG/document/13563), sec titled "DPC
> > Event Handling Implementation Note", page 10, Error Disconnect Recover
> > (EDR) support allows OS to handle error recovery and clearing Error
> > Registers even in FF mode. So create new API pci_aer_raw_clear_status()
> > which allows clearing AER registers without FF mode checks.
> > 
> > Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> > ---
> >   drivers/pci/pci.h      |  2 ++
> >   drivers/pci/pcie/aer.c | 22 ++++++++++++++++++----
> >   2 files changed, 20 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> > index e57e78b619f8..c239e6dd2542 100644
> > --- a/drivers/pci/pci.h
> > +++ b/drivers/pci/pci.h
> > @@ -655,6 +655,7 @@ extern const struct attribute_group aer_stats_attr_group;
> >   void pci_aer_clear_fatal_status(struct pci_dev *dev);
> >   void pci_aer_clear_device_status(struct pci_dev *dev);
> >   int pci_cleanup_aer_error_status_regs(struct pci_dev *dev);
> > +int pci_aer_raw_clear_status(struct pci_dev *dev);
> >   #else
> >   static inline void pci_no_aer(void) { }
> >   static inline void pci_aer_init(struct pci_dev *d) { }
> > @@ -665,6 +666,7 @@ static inline int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> >   {
> >   	return -EINVAL;
> >   }
> > +int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL; }

> It's missing static specifier. It needs to be fixed. I can fix it in
> next version.  Bjorn, if there is no need for next version, can you
> please make this change?

pci_aer_raw_clear_status() is defined in aer.c and called from aer.c
and edr.c, so I do not think it can be static.  Am I missing
something?

I have a review/edr branch that I hope becomes what will be applied.

Bjorn