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Commit 3be77774 authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
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Drivers: hv: Cleanup vmbus_set_event() to support win7 and beyond 



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: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b3bf60c7

drivers/hv/connection.c

+8 −5
Original line number Original line Diff line number Diff line
@@ -383,10 +383,13 @@ int vmbus_post_msg(void *buffer, size_t buflen) 
int vmbus_set_event(struct vmbus_channel *channel)

int vmbus_set_event(struct vmbus_channel *channel)

{

{

	u32 child_relid = channel->offermsg.child_relid;

	u32 child_relid = channel->offermsg.child_relid;



	if (!channel->is_dedicated_interrupt) {

		/* Each u32 represents 32 channels */

		/* Each u32 represents 32 channels */

		sync_set_bit(child_relid & 31,

		sync_set_bit(child_relid & 31,

			(unsigned long *)vmbus_connection.send_int_page +

			(unsigned long *)vmbus_connection.send_int_page +

			(child_relid >> 5));

			(child_relid >> 5));

	}





	return hv_signal_event(hv_context.signal_event_param);

	return hv_signal_event(channel->sig_event);

}
 
}