chardev: remove write polling

In an effort to reduce the wakeups per second, get rid of the
"write_to_dev" timer when the implementation supports
SPICE_CHAR_DEVICE_NOTIFY_WRITABLE.

When this flag is set, the frontend instance is responsible for calling
spice_char_device_wakeup() when the device is ready to perform IO.

Related to:
https://bugzilla.redhat.com/show_bug.cgi?id=912763

1 files changed, 7 insertions, 2 deletions

diff --git a/server/spice.h b/server/spice.h
index 58700d14..bd5bba89 100644
--- a/server/spice.h
+++ b/server/spice.h
@@ -24,7 +24,7 @@
 #include <spice/vd_agent.h>
 #include <spice/macros.h>
 
-#define SPICE_SERVER_VERSION 0x000c05 /* release 0.12.5 */
+#define SPICE_SERVER_VERSION 0x000c06 /* release 0.12.6 */
 
 #ifdef SPICE_SERVER_INTERNAL
 #undef SPICE_GNUC_DEPRECATED
@@ -402,11 +402,15 @@ void     spice_server_set_record_rate(SpiceRecordInstance *sin, uint32_t frequen
 
 #define SPICE_INTERFACE_CHAR_DEVICE "char_device"
 #define SPICE_INTERFACE_CHAR_DEVICE_MAJOR 1
-#define SPICE_INTERFACE_CHAR_DEVICE_MINOR 2
+#define SPICE_INTERFACE_CHAR_DEVICE_MINOR 3
 typedef struct SpiceCharDeviceInterface SpiceCharDeviceInterface;
 typedef struct SpiceCharDeviceInstance SpiceCharDeviceInstance;
 typedef struct SpiceCharDeviceState SpiceCharDeviceState;
 
+typedef enum {
+    SPICE_CHAR_DEVICE_NOTIFY_WRITABLE = 1 << 0,
+} spice_char_device_flags;
+
 struct SpiceCharDeviceInterface {
     SpiceBaseInterface base;
 
@@ -414,6 +418,7 @@ struct SpiceCharDeviceInterface {
     int (*write)(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len);
     int (*read)(SpiceCharDeviceInstance *sin, uint8_t *buf, int len);
     void (*event)(SpiceCharDeviceInstance *sin, uint8_t event);
+    spice_char_device_flags flags;
 };
 
 struct SpiceCharDeviceInstance {