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Drivers: hv: vmbus: remove code duplication in message handling 

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@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Radim Kr.má<rkrcmar@redhat.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 2016-02-26 15:13:17 -08:00 committed by Greg Kroah-Hartman
parent 75ff3a8a91
commit 0f70b66975
3 changed files with 27 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/hv/channel_mgmt.c
View File

@ -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;

24
drivers/hv/hyperv_vmbus.h
View File

@ -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,

40
drivers/hv/vmbus_drv.c
View File

@ -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)