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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-04-11 18:07:46 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-24 12:17:41 -0700
commit636c88da6df3bb2f978b48d3a7ed55423da84d19 (patch)
treebb6abd4d764c96eb90e7ec8cfc67fa7e791abdd6 /drivers/hv/hyperv_vmbus.h
parent1d072339fa9e32365d282d8ade32822de7d21e5f (diff)
Drivers: hv: util: introduce state machine for util drivers
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>
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
-rw-r--r--drivers/hv/hyperv_vmbus.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 2f30456d90a5..138d6634c79d 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -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 */