[PATCH v2 7/7] hw/char/serial: Let SerialState have an 'id' field

[Philippe Mathieu-Daudé]

When a SoC has multiple UARTs (some configured differently),
it is hard to associate events to their UART.

To be able to distinct trace events between various instances,
add an 'id' field. Update the trace format accordingly.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/hw/char/serial.h   | 1 +
 hw/char/serial-pci-multi.c | 1 +
 hw/char/serial.c           | 7 ++++---
 hw/char/trace-events       | 6 +++---
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index 09845721384..a0aaa319a93 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -76,6 +76,7 @@ struct SerialState {
     uint64_t char_transmit_time;    /* time to transmit a char in ticks */
     int poll_msl;
 
+    uint8_t id;
     QEMUTimer *modem_status_poll;
     MemoryRegion io;
 };
diff --git a/hw/char/serial-pci-multi.c b/hw/char/serial-pci-multi.c
index 2cf3e441773..53e0c6e25c0 100644
--- a/hw/char/serial-pci-multi.c
+++ b/hw/char/serial-pci-multi.c
@@ -105,6 +105,7 @@ static void multi_serial_pci_realize(PCIDevice *dev, Error 
**errp)
 
     for (i = 0; i < nports; i++) {
         s = pci->state + i;
+        qdev_prop_set_uint8(s, "id", i);
         if (!qdev_realize(DEVICE(s), NULL, errp)) {
             multi_serial_pci_exit(dev);
             return;
diff --git a/hw/char/serial.c b/hw/char/serial.c
index ade89fadb44..e5a6b939f13 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -177,7 +177,7 @@ static void serial_update_parameters(SerialState *s)
     ssp.stop_bits = stop_bits;
     s->char_transmit_time =  (NANOSECONDS_PER_SECOND / speed) * frame_size;
     qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
-    trace_serial_update_parameters(speed, parity, data_bits, stop_bits);
+    trace_serial_update_parameters(s->id, speed, parity, data_bits, stop_bits);
 }
 
 static void serial_update_msl(SerialState *s)
@@ -333,7 +333,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, 
uint64_t val,
     SerialState *s = opaque;
 
     assert(size == 1 && addr < 8);
-    trace_serial_write(addr, val);
+    trace_serial_write(s->id, addr, val);
     switch(addr) {
     default:
     case 0:
@@ -550,7 +550,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr 
addr, unsigned size)
         ret = s->scr;
         break;
     }
-    trace_serial_read(addr, ret);
+    trace_serial_read(s->id, addr, ret);
     return ret;
 }
 
@@ -1013,6 +1013,7 @@ static const TypeInfo serial_io_info = {
 };
 
 static Property serial_properties[] = {
+    DEFINE_PROP_UINT8("id", SerialState, id, 0),
     DEFINE_PROP_CHR("chardev", SerialState, chr),
     DEFINE_PROP_UINT32("baudbase", SerialState, baudbase, 115200),
     DEFINE_PROP_BOOL("wakeup", SerialState, wakeup, false),
diff --git a/hw/char/trace-events b/hw/char/trace-events
index 609df10fed4..45b8eaab655 100644
--- a/hw/char/trace-events
+++ b/hw/char/trace-events
@@ -5,9 +5,9 @@ parallel_ioport_read(const char *desc, uint16_t addr, uint8_t 
value) "read [%s]
 parallel_ioport_write(const char *desc, uint16_t addr, uint8_t value) "write 
[%s] addr 0x%02x val 0x%02x"
 
 # serial.c
-serial_read(uint16_t addr, uint8_t value) "read addr 0x%02x val 0x%02x"
-serial_write(uint16_t addr, uint8_t value) "write addr 0x%02x val 0x%02x"
-serial_update_parameters(uint64_t baudrate, char parity, int data_bits, int 
stop_bits) "baudrate=%"PRIu64" parity='%c' data=%d stop=%d"
+serial_read(uint8_t id, uint8_t addr, uint8_t value) "id#%u read addr 0x%x val 
0x%02x"
+serial_write(uint8_t id, uint8_t addr, uint8_t value) "id#%u write addr 0x%x 
val 0x%02x"
+serial_update_parameters(uint8_t id, uint64_t baudrate, char parity, int 
data_bits, int stop_bits) "id#%u baudrate=%"PRIu64" parity=%c data=%d stop=%d"
 
 # virtio-serial-bus.c
 virtio_serial_send_control_event(unsigned int port, uint16_t event, uint16_t 
value) "port %u, event %u, value %u"
-- 
2.26.2