Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 39 insertions, 0 deletions

diff --git a/roms/skiboot/doc/opal-api/opal-pci-get-presence-state-119.rst b/roms/skiboot/doc/opal-api/opal-pci-get-presence-state-119.rst
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+.. _OPAL_PCI_GET_PRESENCE_STATE:
+
+OPAL_PCI_GET_PRESENCE_STATE
+===========================
+
+.. code-block: c
+
+   #define OPAL_PCI_GET_PRESENCE_STATE		119
+
+   int64_t opal_pci_get_presence_state(uint64_t id, uint64_t data);
+
+Get PCI slot presence state
+
+Parameters
+----------
+
+``uint64_t id``
+  PCI slot ID
+
+``uint64_t data``
+  memory buffer pointer for presence state
+
+Calling
+-------
+
+Retrieve PCI slot's presence state. The detected presence means there are
+adapters inserted to the PCI slot. Otherwise, the PCI slot is regarded as
+an empty one. The typical use is to ensure there are adapters existing
+before probing the PCI slot in PCI hot add path. The retrieved presence
+state is stored in buffer pointed by @data.
+
+Return Codes
+------------
+:ref:`OPAL_SUCCESS`
+  PCI slot's presence state is retrieved successfully
+:ref:`OPAL_PARAMETER`
+  The indicated PCI slot isn't found
+:ref:`OPAL_UNSUPPORTED`
+  Presence retrieval not supported on the PCI slot