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-rw-r--r--drivers/hv/connection.c26
-rw-r--r--drivers/hv/vmbus_drv.c27
2 files changed, 46 insertions, 7 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 114050dc8e28..ac71653abb77 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -321,10 +321,32 @@ static void process_chn_event(u32 relid)
void vmbus_on_event(unsigned long data)
{
u32 dword;
- u32 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
+ u32 maxdword;
int bit;
u32 relid;
- u32 *recv_int_page = vmbus_connection.recv_int_page;
+ u32 *recv_int_page = NULL;
+ void *page_addr;
+ int cpu = smp_processor_id();
+ union hv_synic_event_flags *event;
+
+ if ((vmbus_proto_version == VERSION_WS2008) ||
+ (vmbus_proto_version == VERSION_WIN7)) {
+ maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
+ recv_int_page = vmbus_connection.recv_int_page;
+ } else {
+ /*
+ * When the host is win8 and beyond, the event page
+ * can be directly checked to get the id of the channel
+ * that has the interrupt pending.
+ */
+ maxdword = HV_EVENT_FLAGS_DWORD_COUNT;
+ page_addr = hv_context.synic_event_page[cpu];
+ event = (union hv_synic_event_flags *)page_addr +
+ VMBUS_MESSAGE_SINT;
+ recv_int_page = event->flags32;
+ }
+
+
/* Check events */
if (!recv_int_page)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 8e1a9ec53003..c583a0403c53 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -460,15 +460,32 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
* Hyper-V, and the Windows team suggested we do the same.
*/
- page_addr = hv_context.synic_event_page[cpu];
- event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
+ if ((vmbus_proto_version == VERSION_WS2008) ||
+ (vmbus_proto_version == VERSION_WIN7)) {
- /* Since we are a child, we only need to check bit 0 */
- if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
+ page_addr = hv_context.synic_event_page[cpu];
+ event = (union hv_synic_event_flags *)page_addr +
+ VMBUS_MESSAGE_SINT;
+
+ /* Since we are a child, we only need to check bit 0 */
+ if (sync_test_and_clear_bit(0,
+ (unsigned long *) &event->flags32[0])) {
+ handled = true;
+ }
+ } else {
+ /*
+ * Our host is win8 or above. The signaling mechanism
+ * has changed and we can directly look at the event page.
+ * If bit n is set then we have an interrup on the channel
+ * whose id is n.
+ */
handled = true;
- tasklet_schedule(&event_dpc);
}
+ if (handled)
+ tasklet_schedule(&event_dpc);
+
+
page_addr = hv_context.synic_message_page[cpu];
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;

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