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Drivers: hv: Add state to manage incoming channel interrupt load

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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>
This commit is contained in:
K. Y. Srinivasan 2012-12-01 06:46:48 -08:00 committed by Greg Kroah-Hartman
parent 917ea427c7
commit abbf3b2aa0
3 changed files with 22 additions and 3 deletions
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2
drivers/hv/channel.c
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@ -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;

2
drivers/hv/channel_mgmt.c
View file

@ -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;

21
include/linux/hyperv.h
View file

@ -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)