From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
We have 3 functions dealing with messages and they all implement
the same logic to finalize reads, move it to vmbus_signal_eom().
Suggested-by: Radim Krcmar <rkrcmar@xxxxxxxxxx>
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Reviewed-by: Radim Kr.má<rkrcmar@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
---
drivers/hv/channel_mgmt.c | 10 +---------
drivers/hv/hyperv_vmbus.h | 24 ++++++++++++++++++++++++
drivers/hv/vmbus_drv.c | 40 ++--------------------------------------
3 files changed, 27 insertions(+), 47 deletions(-)
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index f70e352..73a17be 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -614,15 +614,7 @@ static void vmbus_wait_for_unload(void)
if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE)
unloaded = true;
- msg->header.message_type = HVMSG_NONE;
- /*
- * header.message_type needs to be written before we do
- * wrmsrl() below.
- */
- mb();
-
- if (msg->header.message_flags.msg_pending)
- wrmsrl(HV_X64_MSR_EOM, 0);
+ vmbus_signal_eom(msg);
if (unloaded)
break;
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index b0299da..cada56a 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -624,6 +624,30 @@ struct vmbus_channel_message_table_entry {
extern struct vmbus_channel_message_table_entry
channel_message_table[CHANNELMSG_COUNT];
+/* Free the message slot and signal end-of-message if required */
+static inline void vmbus_signal_eom(struct hv_message *msg)
+{
+ msg->header.message_type = HVMSG_NONE;
+
+ /*
+ * Make sure the write to MessageType (ie set to
+ * HVMSG_NONE) happens before we read the
+ * MessagePending and EOMing. Otherwise, the EOMing
+ * will not deliver any more messages since there is
+ * no empty slot
+ */
+ mb();
+
+ if (msg->header.message_flags.msg_pending) {
+ /*
+ * This will cause message queue rescan to
+ * possibly deliver another msg from the
+ * hypervisor
+ */
+ wrmsrl(HV_X64_MSR_EOM, 0);
+ }
+}
+
/* General vmbus interface */
struct hv_device *vmbus_device_create(const uuid_le *type,
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index c8f1671..6cd12f1 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -709,25 +709,7 @@ static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
if (dev->event_handler)
dev->event_handler(dev);
- msg->header.message_type = HVMSG_NONE;
-
- /*
- * Make sure the write to MessageType (ie set to
- * HVMSG_NONE) happens before we read the
- * MessagePending and EOMing. Otherwise, the EOMing
- * will not deliver any more messages since there is
- * no empty slot
- */
- mb();
-
- if (msg->header.message_flags.msg_pending) {
- /*
- * This will cause message queue rescan to
- * possibly deliver another msg from the
- * hypervisor
- */
- wrmsrl(HV_X64_MSR_EOM, 0);
- }
+ vmbus_signal_eom(msg);
}
static void vmbus_on_msg_dpc(unsigned long data)
@@ -765,25 +747,7 @@ static void vmbus_on_msg_dpc(unsigned long data)
entry->message_handler(hdr);
msg_handled:
- msg->header.message_type = HVMSG_NONE;
-
- /*
- * Make sure the write to MessageType (ie set to
- * HVMSG_NONE) happens before we read the
- * MessagePending and EOMing. Otherwise, the EOMing
- * will not deliver any more messages since there is
- * no empty slot
- */
- mb();
-
- if (msg->header.message_flags.msg_pending) {
- /*
- * This will cause message queue rescan to
- * possibly deliver another msg from the
- * hypervisor
- */
- wrmsrl(HV_X64_MSR_EOM, 0);
- }
+ vmbus_signal_eom(msg);
}
static void vmbus_isr(void)
--
1.7.4.1
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