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OPAL_PCI_GET_POWER_STATE
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Get PCI slot power state
Parameters:
uint64_t id: PCI slot ID
uint64_t data: memory buffer pointer for power state
Calling:
Retrieve PCI slot's power state. The retrieved power state is stored
in buffer pointed by @data.
Return Codes:
OPAL_SUCCESS - PCI slot's power state is retrieved successfully
OPAL_PARAMETER - The indicated PCI slot isn't found
OPAL_UNSUPPORTED - Power state retrieval not supported on the PCI slot
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