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powerpc/eeh: Block PCI config access during reset

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Function pcibios_set_pcie_reset_state() can be used to do PCI
reset. PCI config access during the reset usually causes EEH
errors unexpectedly. In order to avoid the EEH error, the patch
blocks PCI config access during reset with the help of flag
EEH_PE_RESET, which is similar to what we did in EEH PE reset
path.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan 2014-09-30 12:39:03 +10:00 committed by Michael Ellerman
parent c9dd014397
commit 9372dddb18
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/eeh.c
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@ -668,14 +668,18 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
switch (state) {
case pcie_deassert_reset:
eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
eeh_pe_state_clear(pe, EEH_PE_RESET);
break;
case pcie_hot_reset:
eeh_pe_state_mark(pe, EEH_PE_RESET);
eeh_ops->reset(pe, EEH_RESET_HOT);
break;
case pcie_warm_reset:
eeh_pe_state_mark(pe, EEH_PE_RESET);
eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL);
break;
default:
eeh_pe_state_clear(pe, EEH_PE_RESET);
return -EINVAL;
};