[Qemu-devel] [PATCH 5/7] virtio-ccw: Provide traces for indicator changes

[Cornelia Huck <cornelia.huck@de.ibm.com>]

From: Christian Borntraeger <borntraeger@de.ibm.com>

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: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/s390x/virtio-ccw.c | 1 +
 trace-events          | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 7b265e4..262027b 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/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;
diff --git a/trace-events b/trace-events
index c50b870..f672d9c 100644
--- a/trace-events
+++ b/trace-events
@@ -1472,6 +1472,7 @@ 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 %lx: %x->%x"
 
 # hw/intc/s390_flic_kvm.c
 flic_create_device(int err) "flic: create device failed %d"
-- 
2.6.6