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OvmfPkg/XenBusDxe: Add XenStore function into the XenBus protocol

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Change in V3:
- Have XenStoreWaitWatch/XenBusWaitForWatch return a XENSTORE_STATUS
  instead of VOID.
- Add description of the introducted member of the protocol.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16269 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Anthony PERARD
2014-10-29 06:51:04 +00:00
committed by jljusten
parent 02a6bcff71
commit c23c037fb3
3 changed files with 474 additions and 0 deletions
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164
OvmfPkg/XenBusDxe/XenStore.c
View File

@@ -941,6 +941,46 @@ XenStoreUnwatch (
return XenStoreTalkv (XST_NIL, XS_UNWATCH, WriteRequest, 2, NULL, NULL);
}
STATIC
XENSTORE_STATUS
XenStoreWaitWatch (
VOID *Token
)
{
XENSTORE_MESSAGE *Message;
LIST_ENTRY *Entry = NULL;
LIST_ENTRY *Last = NULL;
XENSTORE_STATUS Status;
while (TRUE) {
EfiAcquireLock (&xs.WatchEventsLock);
if (IsListEmpty (&xs.WatchEvents) ||
Last == GetFirstNode (&xs.WatchEvents)) {
EfiReleaseLock (&xs.WatchEventsLock);
Status = XenStoreProcessMessage ();
if (Status != XENSTORE_STATUS_SUCCESS && Status != XENSTORE_STATUS_EAGAIN) {
return Status;
}
continue;
}
for (Entry = GetFirstNode (&xs.WatchEvents);
Entry != Last && !IsNull (&xs.WatchEvents, Entry);
Entry = GetNextNode (&xs.WatchEvents, Entry)) {
Message = XENSTORE_MESSAGE_FROM_LINK (Entry);
if (Message->u.Watch.Handle == Token) {
RemoveEntryList (Entry);
EfiReleaseLock (&xs.WatchEventsLock);
FreePool(Message->u.Watch.Vector);
FreePool(Message);
return XENSTORE_STATUS_SUCCESS;
}
}
Last = GetFirstNode (&xs.WatchEvents);
EfiReleaseLock (&xs.WatchEventsLock);
}
}
VOID
EFIAPI
NotifyEventChannelCheckForEvent (
@@ -1384,3 +1424,127 @@ XenStoreUnregisterWatch (
FreePool (Watch->Node);
FreePool (Watch);
}
//
// XENBUS protocol
//
XENSTORE_STATUS
EFIAPI
XenBusWaitForWatch (
IN XENBUS_PROTOCOL *This,
IN VOID *Token
)
{
return XenStoreWaitWatch (Token);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreRead (
IN XENBUS_PROTOCOL *This,
IN XENSTORE_TRANSACTION Transaction,
IN CONST CHAR8 *Node,
OUT VOID **Value
)
{
return XenStoreRead (Transaction, This->Node, Node, NULL, Value);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreBackendRead (
IN XENBUS_PROTOCOL *This,
IN XENSTORE_TRANSACTION Transaction,
IN CONST CHAR8 *Node,
OUT VOID **Value
)
{
return XenStoreRead (Transaction, This->Backend, Node, NULL, Value);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreRemove (
IN XENBUS_PROTOCOL *This,
IN XENSTORE_TRANSACTION Transaction,
IN const char *Node
)
{
return XenStoreRemove (Transaction, This->Node, Node);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreTransactionStart (
IN XENBUS_PROTOCOL *This,
OUT XENSTORE_TRANSACTION *Transaction
)
{
return XenStoreTransactionStart (Transaction);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreTransactionEnd (
IN XENBUS_PROTOCOL *This,
IN XENSTORE_TRANSACTION Transaction,
IN BOOLEAN Abort
)
{
return XenStoreTransactionEnd (Transaction, Abort);
}
XENSTORE_STATUS
EFIAPI
XenBusXenStoreSPrint (
IN XENBUS_PROTOCOL *This,
IN XENSTORE_TRANSACTION Transaction,
IN CONST CHAR8 *DirectoryPath,
IN CONST CHAR8 *Node,
IN CONST CHAR8 *FormatString,
...
)
{
VA_LIST Marker;
XENSTORE_STATUS Status;
VA_START (Marker, FormatString);
Status = XenStoreVSPrint (Transaction, DirectoryPath, Node, FormatString, Marker);
VA_END (Marker);
return Status;
}
XENSTORE_STATUS
EFIAPI
XenBusRegisterWatch (
IN XENBUS_PROTOCOL *This,
IN CONST CHAR8 *Node,
OUT VOID **Token
)
{
return XenStoreRegisterWatch (This->Node, Node, (XENSTORE_WATCH **) Token);
}
XENSTORE_STATUS
EFIAPI
XenBusRegisterWatchBackend (
IN XENBUS_PROTOCOL *This,
IN CONST CHAR8 *Node,
OUT VOID **Token
)
{
return XenStoreRegisterWatch (This->Backend, Node, (XENSTORE_WATCH **) Token);
}
VOID
EFIAPI
XenBusUnregisterWatch (
IN XENBUS_PROTOCOL *This,
IN VOID *Token
)
{
XenStoreUnregisterWatch ((XENSTORE_WATCH *) Token);
}