hv: add suspend/resume callback for console

To handle s3 enter/exit for console

Signed-off-by: Zheng Gen <gen.zheng@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: fyin1

hypervisor/debug/console.c

@@ -10,6 +10,7 @@
 static spinlock_t lock;
 
 static uint32_t serial_handle = SERIAL_INVALID_HANDLE;
+struct timer console_timer;
 
 #define CONSOLE_KICK_TIMER_TIMEOUT  40 /* timeout is 40ms*/
 
@@ -198,7 +199,6 @@ static int console_timer_callback(__unused void *data)
 
 void console_setup_timer(void)
 {
-	static struct timer console_timer;
 	uint64_t period_in_cycle, fire_tsc;
 
 	if (serial_handle == SERIAL_INVALID_HANDLE) {

hypervisor/include/debug/console.h

@@ -8,6 +8,8 @@
 #define CONSOLE_H
 
 #ifdef HV_DEBUG
+extern struct timer console_timer;
+
 /** Initializes the console module.
  *
  *  @param cdev A pointer to the character device to use for the console.
@@ -62,6 +64,17 @@ void console_dump_bytes(const void *p, unsigned int len);
 void console_setup_timer(void);
 
 uint32_t get_serial_handle(void);
+
+static inline void suspend_console(void)
+{
+	del_timer(&console_timer);
+}
+
+static inline void resume_console_enable(void)
+{
+	console_setup_timer();
+}
+
 #else
 static inline int console_init(void)
 {
@@ -86,6 +99,9 @@ static inline void console_dump_bytes(__unused const void *p,
 }
 static inline void console_setup_timer(void) {}
 static inline uint32_t get_serial_handle(void) { return 0; }
+
+void suspend_console(void) {}
+void resume_console_enable(void) {}
 #endif
 
 #endif /* CONSOLE_H */