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Subject[PATCH 15/28] Drivers: hv: Cleanup vmbus_set_event() to support win7 and beyond
Date
On win7 (ws2008 R2) and beyond, we have the notion of having dedicated interrupts on
a per-channel basis. When a channel has a dedicated interrupt assigned, there is no need
to set the interrupt bit in the shared page. Implement this optimization.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
drivers/hv/connection.c | 13 ++++++++-----
1 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 56b14e5..114050d 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -383,10 +383,13 @@ int vmbus_post_msg(void *buffer, size_t buflen)
int vmbus_set_event(struct vmbus_channel *channel)
{
u32 child_relid = channel->offermsg.child_relid;
- /* Each u32 represents 32 channels */
- sync_set_bit(child_relid & 31,
- (unsigned long *)vmbus_connection.send_int_page +
- (child_relid >> 5));

- return hv_signal_event(hv_context.signal_event_param);
+ if (!channel->is_dedicated_interrupt) {
+ /* Each u32 represents 32 channels */
+ sync_set_bit(child_relid & 31,
+ (unsigned long *)vmbus_connection.send_int_page +
+ (child_relid >> 5));
+ }
+
+ return hv_signal_event(channel->sig_event);
}
--
1.7.4.1


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