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Diffstat (limited to 'doc/opal-api/opal-pci-set-p2p-157.rst')
-rw-r--r-- | doc/opal-api/opal-pci-set-p2p-157.rst | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/doc/opal-api/opal-pci-set-p2p-157.rst b/doc/opal-api/opal-pci-set-p2p-157.rst new file mode 100644 index 0000000..c34630c --- /dev/null +++ b/doc/opal-api/opal-pci-set-p2p-157.rst @@ -0,0 +1,50 @@ +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 +---------- +:: + + uint64_t phbid_init + uint64_t phbid_target + uint64_t desc + uint16_t pe_number + + +``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 |