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Drivers: hv: Cleanup vmbus_set_event() to support win7 and beyond

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2012-12-01 06:46:46 -08:00 committed by Greg Kroah-Hartman
parent b3bf60c7b4
commit 3be7777401
1 changed files with 8 additions and 5 deletions
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13
drivers/hv/connection.c
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@ -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);
}