OPAL_PCI_SET_P2P

#define OPAL_PCI_SET_P2P                     157

int64_t opal_pci_set_p2p(uint64_t phbid_init, uint64_t phbid_target,
                             uint64_t desc, uint16_t pe_number);

/* PCI p2p descriptor */
#define OPAL_PCI_P2P_ENABLE          0x1
#define OPAL_PCI_P2P_LOAD            0x2
#define OPAL_PCI_P2P_STORE           0x4

The host calls this function to enable PCI peer-to-peer on the PHBs.

Parameters

phbid_init
is the value from the PHB node ibm,opal-phbid property for the device initiating the p2p operation
phbid_target
is the value from the PHB node ibm,opal-phbid property for the device targeted by the p2p operation
desc
tells whether the p2p operation is a store (OPAL_PCI_P2P_STORE) or load (OPAL_PCI_P2P_LOAD). Can be both. OPAL_PCI_P2P_ENABLE enables/disables the setting
pe_number
PE number for the initiating device

Return Values

OPAL_SUCCESS
Configuration was successful
OPAL_PARAMETER
Invalid PHB or mode parameter
OPAL_UNSUPPORTED
Not supported by hardware