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powerpc/powernv: Escalate reset when IODA reset fails 

The IODA reset is used to flush out any OS controlled state from the PHB.
This reset can fail if a PHB fatal error has occurred in early boot,
probably due to a because of a bad device. We already do a fundemental
reset of the device in some cases, so this patch just adds a test to force
a full reset if firmware reports an error when performing the IODA reset.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Oliver O'Halloran 2019-02-01 11:42:01 +11:00 committed by Michael Ellerman
parent ebb0e13ead
commit b174b4fb91
1 changed files with 5 additions and 2 deletions
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7
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -3943,9 +3943,12 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
* shutdown PCI devices correctly. We already got IODA table * shutdown PCI devices correctly. We already got IODA table
* cleaned out. So we have to issue PHB reset to stop all PCI * cleaned out. So we have to issue PHB reset to stop all PCI
* transactions from previous kernel. The ppc_pci_reset_phbs * transactions from previous kernel. The ppc_pci_reset_phbs
* kernel parameter will force this reset too. * kernel parameter will force this reset too. Additionally,
* if the IODA reset above failed then use a bigger hammer.
* This can happen if we get a PHB fatal error in very early
* boot.
*/ */
if (is_kdump_kernel() || pci_reset_phbs) { if (is_kdump_kernel() || pci_reset_phbs || rc) {
pr_info(" Issue PHB reset ...\n"); pr_info(" Issue PHB reset ...\n");
pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL); pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE); pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE);