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SubjectRe: [PATCH v5 05/10] PCI/AER: Apply function level reset to RCiEP on fatal error
On Mon, Sep 21, 2020 at 4:15 AM Jonathan Cameron
<Jonathan.Cameron@huawei.com> wrote:
>
> On Fri, 18 Sep 2020 13:45:58 -0700
> Sean V Kelley <sean.v.kelley@intel.com> wrote:
>
> > From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> >
> > Attempt to do function level reset for an RCiEP associated with an
> > RCEC device on fatal error.
>
> I'm not sure the description is correct. Looks like it will do
> the reset even if not associated with an RCEC.
> I'd just cut this down to:
>
> "Attempt to do a function level reset for an RCiEP on fatal error."

Agree. Will change.

>
> I'm not 100% sure doing an flr will actually help in most cass if you've
> reported a fatal error, but I suppose it does no harm!
>
> So with description changed.
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Will do, thanks.

Sean

>
> >
> > Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> > ---
> > drivers/pci/pcie/err.c | 31 ++++++++++++++++++++++---------
> > 1 file changed, 22 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
> > index e575fa6cee63..5380ecc41506 100644
> > --- a/drivers/pci/pcie/err.c
> > +++ b/drivers/pci/pcie/err.c
> > @@ -169,6 +169,17 @@ static void pci_bridge_walk(struct pci_dev *bridge, int (*cb)(struct pci_dev *,
> > cb(bridge, userdata);
> > }
> >
> > +static pci_ers_result_t flr_on_rciep(struct pci_dev *dev)
> > +{
> > + if (!pcie_has_flr(dev))
> > + return PCI_ERS_RESULT_NONE;
> > +
> > + if (pcie_flr(dev))
> > + return PCI_ERS_RESULT_DISCONNECT;
> > +
> > + return PCI_ERS_RESULT_RECOVERED;
> > +}
> > +
> > pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
> > pci_channel_state_t state,
> > pci_ers_result_t (*reset_subordinate_devices)(struct pci_dev *pdev))
> > @@ -195,15 +206,17 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
> > if (state == pci_channel_io_frozen) {
> > pci_bridge_walk(bridge, report_frozen_detected, &status);
> > if (type == PCI_EXP_TYPE_RC_END) {
> > - pci_warn(dev, "link reset not possible for RCiEP\n");
> > - status = PCI_ERS_RESULT_NONE;
> > - goto failed;
> > - }
> > -
> > - status = reset_subordinate_devices(bridge);
> > - if (status != PCI_ERS_RESULT_RECOVERED) {
> > - pci_warn(dev, "subordinate device reset failed\n");
> > - goto failed;
> > + status = flr_on_rciep(dev);
> > + if (status != PCI_ERS_RESULT_RECOVERED) {
> > + pci_warn(dev, "function level reset failed\n");
> > + goto failed;
> > + }
> > + } else {
> > + status = reset_subordinate_devices(bridge);
> > + if (status != PCI_ERS_RESULT_RECOVERED) {
> > + pci_warn(dev, "subordinate device reset failed\n");
> > + goto failed;
> > + }
> > }
> > } else {
> > pci_bridge_walk(bridge, report_normal_detected, &status);
>
>

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