[PATCH v6 24/30] powerpc/powernv/pci: Suppress an EEH error when reading an empty slot
From: Sergey Miroshnichenko <hidden>
Date: 2019-10-24 18:05:57
Also in:
linux-pci
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Reading an empty slot returns all ones, which triggers a false EEH error event on PowerNV. A rescan is performed after all the PEs have been unmapped, so the reserved PE index is used for unfreezing. CC: Oliver O'Halloran <oohall@gmail.com> CC: Sam Bobroff <redacted> Signed-off-by: Sergey Miroshnichenko <redacted> --- arch/powerpc/platforms/powernv/pci.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index ffd546cf9204..e1b45dc96474 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c@@ -768,9 +768,16 @@ static int pnv_pci_read_config(struct pci_bus *bus, *val = 0xFFFFFFFF; pdn = pci_get_pdn_by_devfn(bus, devfn); - if (!pdn) - return pnv_pci_cfg_read_raw(phb->opal_id, bus->number, devfn, - where, size, val); + if (!pdn) { + ret = pnv_pci_cfg_read_raw(phb->opal_id, bus->number, devfn, + where, size, val); + + if (!ret && (*val == EEH_IO_ERROR_VALUE(size)) && phb->unfreeze_pe) + phb->unfreeze_pe(phb, phb->ioda.reserved_pe_idx, + OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); + + return ret; + } if (!pnv_pci_cfg_check(pdn)) return PCIBIOS_DEVICE_NOT_FOUND;
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2.23.0