Debug

Locate the root cause is need to notify an elapsed event
to driver, yet still coming up with a solution.

Author: Cuda-Chen

virtio-snd.c

@@ -20,6 +20,8 @@
 
 #define PRIV(x) ((virtio_snd_config_t *) x->priv)
 
+static int cnt = 0;
+
 enum {
     VSND_QUEUE_CTRL = 0,
     VSND_QUEUE_EVT = 1,
@@ -985,6 +987,7 @@ static bool virtio_snd_reg_write(virtio_snd_state_t *vsnd,
                 fprintf(stderr, "TX start\n");
                 virtio_queue_notify_handler(vsnd, value,
                                             virtio_snd_tx_desc_handler);
+                sleep(1);
                 fprintf(stderr, "TX end\n");
                 break;
             default:
@@ -1021,6 +1024,7 @@ void virtio_snd_read(hart_t *vm,
                      uint8_t width,
                      uint32_t *value)
 {
+    fprintf(stderr, "=== start read lock ===\n");
     pthread_mutex_lock(&virtio_snd_mutex);
     switch (width) {
     case RV_MEM_LW:
@@ -1038,6 +1042,8 @@ void virtio_snd_read(hart_t *vm,
         vm_set_exception(vm, RV_EXC_ILLEGAL_INSN, 0);
         break;
     }
+    cnt++;
+    fprintf(stderr, "=== end read lock count %d ===\n", cnt);
     pthread_mutex_unlock(&virtio_snd_mutex);
 }
 void virtio_snd_write(hart_t *vm,
@@ -1046,6 +1052,7 @@ void virtio_snd_write(hart_t *vm,
                       uint8_t width,
                       uint32_t value)
 {
+    fprintf(stderr, "=== start write lock ===\n");
     pthread_mutex_lock(&virtio_snd_mutex);
     switch (width) {
     case RV_MEM_SW:
@@ -1060,6 +1067,8 @@ void virtio_snd_write(hart_t *vm,
         vm_set_exception(vm, RV_EXC_ILLEGAL_INSN, 0);
         break;
     }
+    cnt++;
+    fprintf(stderr, "=== end write lock count %d ===\n", cnt);
     pthread_mutex_unlock(&virtio_snd_mutex);
 }