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Drivers: hv: util: introduce state machine for util drivers

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KVP/VSS/FCOPY drivers work in fully serialized mode: we wait till userspace
daemon registers, wait for a message from the host, send this message to the
daemon, get the reply, send it back to host, wait for another message.
Introduce enum hvutil_device_state to represend this state in all 3 drivers.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2015-04-11 18:07:46 -07:00 committed by Greg Kroah-Hartman
parent 1d072339fa
commit 636c88da6d
1 changed files with 9 additions and 0 deletions
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9
drivers/hv/hyperv_vmbus.h
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@ -755,4 +755,13 @@ static inline void hv_poll_channel(struct vmbus_channel *channel,
cb(channel);
}
enum hvutil_device_state {
HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
HVUTIL_READY, /* userspace is registered */
HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
HVUTIL_DEVICE_DYING, /* driver unload is in progress */
};
#endif /* _HYPERV_VMBUS_H */