staging: unisys: visorchannel: Add peek function
According to unisys, the s_par hypervisor has a bug in which it never
triggers an interrupt. That makes the visornic effectively a 2ms poll
loop. In order to just have the rx thread shceduling a napi poll every
2ms, lets instead give it the chance to check the response queue for
data before we schedule. This helper provides that functionality
Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/unisys/include/visorbus.h b/drivers/staging/unisys/include/visorbus.h
index a0144c6..9235536 100644
--- a/drivers/staging/unisys/include/visorbus.h
+++ b/drivers/staging/unisys/include/visorbus.h
@@ -201,6 +201,8 @@
void *msg);
bool visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
void *msg);
+bool visorchannel_signalempty(struct visorchannel *channel, u32 queue);
+
int visorchannel_signalqueue_slots_avail(struct visorchannel *channel,
u32 queue);
int visorchannel_signalqueue_max_slots(struct visorchannel *channel, u32 queue);