OPAL_PCI_SET_PELTV

#define OPAL_PCI_SET_PELTV                   32

int64_t opal_pci_set_peltv(uint64_t phb_id, uint32_t parent_pe,
                           uint32_t child_pe, uint8_t state);

WARNING: This documentation comes from an old source and is possibly not up to date with OPALv3. Rely on this documentation only as a starting point, use the source (and update the docs).

This call sets the PELTV of a parent PE to add or remove a PE number as a PE within that parent PE domain. The host must call this function for each child of a parent PE.

phb_id

is the value from the PHB node ibm,opal-phbid property

parent_pe

is the PE number of a PE that is higher in the PCI hierarchy to other PEs, such that an error involving this parent PE should cause a collateral PE freeze for PEs below this PE in the PCI hierarchy. For example a switch upstream bridge is a PE that is parent to PEs reached through that upstream bridge such that an error involving the upstream bridge (e.g, ERR_FATAL) should cause the PHB to freeze all other PEs below that upstream bridge (e.g., a downstream bridge, or devices below a downstream bridge).

child_pe

is the PE number of a PE that is lower in the PCI hierarchy than another PE, such that an error involving that other PE should cause a collateral PE freeze for this child PE. For example a device below a downstream bridge of a PCIE switch is a child PE that downstream bridge PE and the upstream bridge PE of that switch – an ERR_Fatal from either bridge should result in a collateral freeze of that device PE.

enum OpalPeltvAction {
     OPAL_REMOVE_PE_FROM_DOMAIN = 0,
     OPAL_ADD_PE_TO_DOMAIN = 1
};

OPAL Implementation Note: WARNING TODO: CHECK IF THIS IS CORRECT FOR skiboot: For ibm,opal-ioda2, OPAL sets the PELTV bit in all RTT entries for the parent PE when the state argument is ‘1’. OPAL clears the PELTV bit in all RTT entries for the parent PE when the state argument is ‘0’ and setting the child PE bit in the parent PELTV results in an all-zeros value for that PELTV.

Return value:

if (!phb)
        return OPAL_PARAMETER;
if (!phb->ops->set_peltv)
        return OPAL_UNSUPPORTED;