virtio-ccw: Provide traces for indicator changes

This allows to trace changes in the summary and queue indicators
for the non-irqfd case. For irqfd, kernel traces are needed instead.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/virtio-ccw.c

@@ -1091,6 +1091,7 @@ static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
         ind_old = *ind_addr;
         ind_new = ind_old | to_be_set;
     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
+    trace_virtio_ccw_set_ind(ind_loc, ind_old, ind_new);
     cpu_physical_memory_unmap(ind_addr, len, 1, len);
 
     return ind_old;

trace-events

@@ -1475,6 +1475,7 @@ css_adapter_interrupt(uint8_t isc) "CSS: adapter I/O interrupt (isc %x)"
 # hw/s390x/virtio-ccw.c
 virtio_ccw_interpret_ccw(int cssid, int ssid, int schid, int cmd_code) "VIRTIO-CCW: %x.%x.%04x: interpret command %x"
 virtio_ccw_new_device(int cssid, int ssid, int schid, int devno, const char *devno_mode) "VIRTIO-CCW: add subchannel %x.%x.%04x, devno %04x (%s)"
+virtio_ccw_set_ind(uint64_t ind_loc, uint8_t ind_old, uint8_t ind_new) "VIRTIO-CCW: indicator at %" PRIu64 ": %x->%x"
 
 # hw/intc/s390_flic_kvm.c
 flic_create_device(int err) "flic: create device failed %d"