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authorK. Y. Srinivasan <kys@microsoft.com>2012-12-01 06:46:48 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 11:39:14 -0800
commitabbf3b2aa090b4a6bf22c935924b6467990266da (patch)
tree4a4f3a84ac7b05b1608c2ee9552c5899de6981bd
parent917ea427c78670958488f7f304e4629c325969a4 (diff)
Drivers: hv: Add state to manage incoming channel interrupt load
Add state to bind a channel to a specific VCPU. This will help us better distribute incoming interrupt load. 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>
-rw-r--r--drivers/hv/channel.c2
-rw-r--r--drivers/hv/channel_mgmt.c2
-rw-r--r--include/linux/hyperv.h21
3 files changed, 22 insertions, 3 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 70a34daa04c1..9303252b2e19 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -181,7 +181,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >>
PAGE_SHIFT;
- open_msg->server_contextarea_gpadlhandle = 0;
+ open_msg->target_vp = newchannel->target_vp;
if (userdatalen > MAX_USER_DEFINED_BYTES) {
err = -EINVAL;
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index f4d990285d99..56ed45c74d01 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -302,6 +302,8 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
offer->connection_id;
}
+ newchannel->target_vp = 0;
+
memcpy(&newchannel->offermsg, offer,
sizeof(struct vmbus_channel_offer_channel));
newchannel->monitor_grp = (u8)offer->monitorid / 32;
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index c6e2c44a1be9..8c3cb1fc34d4 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -732,8 +732,15 @@ struct vmbus_channel_open_channel {
/* GPADL for the channel's ring buffer. */
u32 ringbuffer_gpadlhandle;
- /* GPADL for the channel's server context save area. */
- u32 server_contextarea_gpadlhandle;
+ /*
+ * Starting with win8, this field will be used to specify
+ * the target virtual processor on which to deliver the interrupt for
+ * the host to guest communication.
+ * Prior to win8, incoming channel interrupts would only
+ * be delivered on cpu 0. Setting this value to 0 would
+ * preserve the earlier behavior.
+ */
+ u32 target_vp;
/*
* The upstream ring buffer begins at offset zero in the memory
@@ -971,6 +978,16 @@ struct vmbus_channel {
bool is_dedicated_interrupt;
struct hv_input_signal_event_buffer sig_buf;
struct hv_input_signal_event *sig_event;
+
+ /*
+ * Starting with win8, this field will be used to specify
+ * the target virtual processor on which to deliver the interrupt for
+ * the host to guest communication.
+ * Prior to win8, incoming channel interrupts would only
+ * be delivered on cpu 0. Setting this value to 0 would
+ * preserve the earlier behavior.
+ */
+ u32 target_vp;
};
static inline void set_channel_read_state(struct vmbus_channel *c, bool state)

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