hw/isa: add trace events for ICH9 LPC chip config access

These tracepoints aid in understanding and debugging the guest drivers
for the TCO watchdog.

Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20221216125749.596075-3-berrange@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/isa/lpc_ich9.c

@@ -52,6 +52,7 @@
 #include "hw/nvram/fw_cfg.h"
 #include "qemu/cutils.h"
 #include "hw/acpi/acpi_aml_interface.h"
+#include "trace.h"
 
 /*****************************************************************************/
 /* ICH9 LPC PCI to ISA bridge */
@@ -162,6 +163,7 @@ static void ich9_cc_write(void *opaque, hwaddr addr,
 {
     ICH9LPCState *lpc = (ICH9LPCState *)opaque;
 
+    trace_ich9_cc_write(addr, val, len);
     ich9_cc_addr_len(&addr, &len);
     memcpy(lpc->chip_config + addr, &val, len);
     pci_bus_fire_intx_routing_notifier(pci_get_bus(&lpc->d));
@@ -177,6 +179,7 @@ static uint64_t ich9_cc_read(void *opaque, hwaddr addr,
     uint32_t val = 0;
     ich9_cc_addr_len(&addr, &len);
     memcpy(&val, lpc->chip_config + addr, len);
+    trace_ich9_cc_read(addr, val, len);
     return val;
 }
 

hw/isa/trace-events

@@ -21,3 +21,7 @@ via_pm_io_read(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%
 via_pm_io_write(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%x"
 via_superio_read(uint8_t addr, uint8_t val) "addr 0x%x val 0x%x"
 via_superio_write(uint8_t addr, uint32_t val) "addr 0x%x val 0x%x"
+
+# lpc_ich9.c
+ich9_cc_write(uint64_t addr, uint64_t val, unsigned len) "addr=0x%"PRIx64 " val=0x%"PRIx64 " len=%u"
+ich9_cc_read(uint64_t addr, uint64_t val, unsigned len) "addr=0x%"PRIx64 " val=0x%"PRIx64 " len=%u"