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    SubjectRe: [PATCH v17 09/12] PCI/AER: Allow clearing Error Status Register in FF mode
    On Fri, Mar 06, 2020 at 08:11:41AM -0800, Kuppuswamy, Sathyanarayanan wrote:
    > On 3/6/2020 8:04 AM, Bjorn Helgaas wrote:
    > > On Thu, Mar 05, 2020 at 09:45:46PM -0800, Kuppuswamy, Sathyanarayanan wrote:
    > > > On 3/3/2020 6:36 PM, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
    > > > > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.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@linux.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?

    > For kernel configs that does not define CONFIG_PCIEAER, it will create
    > redefinition error since pci.h can be included in many files.

    Oh, right, I thought you were talking about the definition in aer.c.
    The stub in pci.h is missing "inline" as well as "static".

    Fixed.

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