GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-22 06:32:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Drivers: hv: vmbus: On the read path cleanup the logic to interrupt the host

Browse source 
Signal the host when we determine the host is to be signaled -
on th read path. The currrent code determines the need to signal in the
ringbuffer code and actually issues the signal elsewhere. This can result
in the host viewing this interrupt as spurious since the host may also
poll the channel. Make the necessary adjustments.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2016-11-06 13:14:18 -08:00 • committed by Greg Kroah-Hartman
parent 1f6ee4e7d8
commit 3372592a14
4 changed files with 14 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/linux/hyperv.h
View file

@ -1487,10 +1487,11 @@ hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
* there is room for the producer to send the pending packet.
*/
static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi)
static inline void hv_signal_on_read(struct vmbus_channel *channel)
{
u32 cur_write_sz;
u32 pending_sz;
struct hv_ring_buffer_info *rbi = &channel->inbound;
/*
* Issue a full memory barrier before making the signaling decision.
@ -1508,14 +1509,14 @@ static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi)
pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz);
/* If the other end is not blocked on write don't bother. */
if (pending_sz == 0)
return false;
return;
cur_write_sz = hv_get_bytes_to_write(rbi);
if (cur_write_sz >= pending_sz)
return true;
vmbus_setevent(channel);
return false;
return;
}
/*
@ -1587,8 +1588,7 @@ static inline void commit_rd_index(struct vmbus_channel *channel)
virt_rmb();
ring_info->ring_buffer->read_index = ring_info->priv_read_index;
if (hv_need_to_signal_on_read(ring_info))
vmbus_set_event(channel);
hv_signal_on_read(channel);
}