Drivers: hv: Manage signaling state on a per-connection basis

The current code has a global handle for supporting signaling of the host
from guest. Make this a per-channel attribute as on some versions of the
host we can signal on per-channel handle.

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>

3 files changed, 45 insertions, 21 deletions

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 7bf59177aaf8..f4d990285d99 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -282,6 +282,26 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
          */
         newchannel->batched_reading = true;
 
+        /*
+         * Setup state for signalling the host.
+         */
+        newchannel->sig_event = (struct hv_input_signal_event *)
+                                (ALIGN((unsigned long)
+                                &newchannel->sig_buf,
+                                HV_HYPERCALL_PARAM_ALIGN));
+
+        newchannel->sig_event->connectionid.asu32 = 0;
+        newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
+        newchannel->sig_event->flag_number = 0;
+        newchannel->sig_event->rsvdz = 0;
+
+        if (vmbus_proto_version != VERSION_WS2008) {
+                newchannel->is_dedicated_interrupt =
+                                (offer->is_dedicated_interrupt != 0);
+                newchannel->sig_event->connectionid.u.id =
+                                offer->connection_id;
+        }
+
         memcpy(&newchannel->offermsg, offer,
                sizeof(struct vmbus_channel_offer_channel));
         newchannel->monitor_grp = (u8)offer->monitorid / 32;
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index cd48ac331708..1bc7500fb84c 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -101,15 +101,6 @@ enum hv_message_type {
 /* Define invalid partition identifier. */
 #define HV_PARTITION_ID_INVALID         ((u64)0x0)
 
-/* Define connection identifier type. */
-union hv_connection_id {
-        u32 asu32;
-        struct {
-                u32 id:24;
-                u32 reserved:8;
-        } u;
-};
-
 /* Define port identifier type. */
 union hv_port_id {
         u32 asu32;
@@ -338,13 +329,6 @@ struct hv_input_post_message {
         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 };
 
-/* Definition of the hv_signal_event hypercall input structure. */
-struct hv_input_signal_event {
-        union hv_connection_id connectionid;
-        u16 flag_number;
-        u16 rsvdz;
-};
-
 /*
  * Versioning definitions used for guests reporting themselves to the
  * hypervisor, and visa versa.
@@ -498,11 +482,6 @@ static const uuid_le VMBUS_SERVICE_ID = {
 
 
 
-struct hv_input_signal_event_buffer {
-        u64 align8;
-        struct hv_input_signal_event event;
-};
-
 struct hv_context {
         /* We only support running on top of Hyper-V
         * So at this point this really can only contain the Hyper-V ID
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e72502689cdc..c6e2c44a1be9 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -897,6 +897,27 @@ struct vmbus_close_msg {
         struct vmbus_channel_close_channel msg;
 };
 
+/* Define connection identifier type. */
+union hv_connection_id {
+        u32 asu32;
+        struct {
+                u32 id:24;
+                u32 reserved:8;
+        } u;
+};
+
+/* Definition of the hv_signal_event hypercall input structure. */
+struct hv_input_signal_event {
+        union hv_connection_id connectionid;
+        u16 flag_number;
+        u16 rsvdz;
+};
+
+struct hv_input_signal_event_buffer {
+        u64 align8;
+        struct hv_input_signal_event event;
+};
+
 struct vmbus_channel {
         struct list_head listentry;
 
@@ -946,6 +967,10 @@ struct vmbus_channel {
          */
 
         bool batched_reading;
+
+        bool is_dedicated_interrupt;
+        struct hv_input_signal_event_buffer sig_buf;
+        struct hv_input_signal_event *sig_event;
 };
 
 static inline void set_channel_read_state(struct vmbus_channel *c, bool state)