From: Neil Horman <nhor...@redhat.com>
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 <nhor...@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.ro...@unisys.com>
---
drivers/staging/unisys/include/visorbus.h | 2 ++
drivers/staging/unisys/visorbus/visorchannel.c | 21 +++++++++++++++++++++
2 files changed, 23 insertions(+)
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 @@ bool visorchannel_signalremove(struct visorchannel
*channel, u32 queue,
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);
diff --git a/drivers/staging/unisys/visorbus/visorchannel.c
b/drivers/staging/unisys/visorbus/visorchannel.c
index 2422464..6da7e49 100644
--- a/drivers/staging/unisys/visorbus/visorchannel.c
+++ b/drivers/staging/unisys/visorbus/visorchannel.c
@@ -430,6 +430,27 @@ visorchannel_signalremove(struct visorchannel *channel,
u32 queue, void *msg)
}
EXPORT_SYMBOL_GPL(visorchannel_signalremove);
+bool
+visorchannel_signalempty(struct visorchannel *channel, u32 queue)
+{
+ unsigned long flags = 0;
+ struct signal_queue_header sig_hdr;
+ bool rc = false;
+
+ if (channel->needs_lock)
+ spin_lock_irqsave(&channel->remove_lock, flags);
+
+ if (!sig_read_header(channel, queue, &sig_hdr))
+ rc = true;
+ if (sig_hdr.head == sig_hdr.tail)
+ rc = true;
+ if (channel->needs_lock)
+ spin_unlock_irqrestore(&channel->remove_lock, flags);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(visorchannel_signalempty);
+
static bool
signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
{
--
2.1.4
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