Messages in this thread | | | Date | Tue, 29 Jun 2021 11:34:37 +0800 | From | Wesley Sheng <> | Subject | Re: [PATCH] Documentation: PCI: pci-error-recovery: rearrange the general sequence |
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On Fri, Jun 18, 2021 at 05:21:32PM +1000, Oliver O'Halloran wrote: > On Fri, Jun 18, 2021 at 4:05 PM Wesley Sheng <wesley.sheng@amd.com> wrote: > > > > Reset_link() callback function was called before mmio_enabled() in > > pcie_do_recovery() function actually, so rearrange the general > > sequence betwen step 2 and step 3 accordingly. > > I don't think this is true in all cases. If pcie_do_recovery() is > called with state==pci_channel_io_normal (i.e. non-fatal AER) the link > won't be reset. EEH (ppc PCI error recovery thing) also uses > .mmio_enabled() as described.
Yes, in case of non-fatal AER, reset_link() callback (aer_root_reset() for AER and dpc_reset_link() for DPC) will not be invoked. And if .error_detected() return PCI_ERS_RESULT_CAN_RECOVER, .mmio_enabled() be called followed.
But if pcie_do_recovery() is called with state == pci_channel_io_frozen, reset_link() callback is called after .error_detected() but before .mmio_enabled(). So I thought Step 2: MMIO Enabled and Step 3: Link Reset should rearrange their sequence.
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