linux-kernel - [PATCH 15/28] Drivers: hv: Cleanup vmbus_set

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Date:	Sat,  1 Dec 2012 06:46:46 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 15/28] 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: K. Y. Srinivasan <kys@...rosoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.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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