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hw/misc/i2c-echo: add tracing

Browse source 
This has been useful when debugging and unsure if the guest is
generating i2c traffic.

Signed-off-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250121105935.3069035-1-titusr@google.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Titus Rwantare 2025-01-21 10:59:34 +00:00 • committed by Philippe Mathieu-Daudé
parent 4ef6d66547
commit fd7d66de54
2 changed files with 13 additions and 0 deletions
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8
hw/misc/i2c-echo.c
View file

@ -13,6 +13,7 @@
#include "qemu/main-loop.h" #include "qemu/main-loop.h"
#include "block/aio.h" #include "block/aio.h"
#include "hw/i2c/i2c.h" #include "hw/i2c/i2c.h"
#include "trace.h"
#define TYPE_I2C_ECHO "i2c-echo" #define TYPE_I2C_ECHO "i2c-echo"
OBJECT_DECLARE_SIMPLE_TYPE(I2CEchoState, I2C_ECHO) OBJECT_DECLARE_SIMPLE_TYPE(I2CEchoState, I2C_ECHO)
@ -80,11 +81,13 @@ static int i2c_echo_event(I2CSlave *s, enum i2c_event event)
case I2C_START_RECV: case I2C_START_RECV:
state->pos = 0; state->pos = 0;
trace_i2c_echo_event(DEVICE(s)->canonical_path, "I2C_START_RECV");
break; break;
case I2C_START_SEND: case I2C_START_SEND:
state->pos = 0; state->pos = 0;
trace_i2c_echo_event(DEVICE(s)->canonical_path, "I2C_START_SEND");
break; break;
case I2C_FINISH: case I2C_FINISH:
@ -92,12 +95,15 @@ static int i2c_echo_event(I2CSlave *s, enum i2c_event event)
state->state = I2C_ECHO_STATE_START_SEND; state->state = I2C_ECHO_STATE_START_SEND;
i2c_bus_master(state->bus, state->bh); i2c_bus_master(state->bus, state->bh);
trace_i2c_echo_event(DEVICE(s)->canonical_path, "I2C_FINISH");
break; break;
case I2C_NACK: case I2C_NACK:
trace_i2c_echo_event(DEVICE(s)->canonical_path, "I2C_NACK");
break; break;
default: default:
trace_i2c_echo_event(DEVICE(s)->canonical_path, "UNHANDLED");
return -1; return -1;
} }
@ -112,6 +118,7 @@ static uint8_t i2c_echo_recv(I2CSlave *s)
return 0xff; return 0xff;
} }
trace_i2c_echo_recv(DEVICE(s)->canonical_path, state->data[state->pos]);
return state->data[state->pos++]; return state->data[state->pos++];
} }
@ -119,6 +126,7 @@ static int i2c_echo_send(I2CSlave *s, uint8_t data)
{ {
I2CEchoState *state = I2C_ECHO(s); I2CEchoState *state = I2C_ECHO(s);
trace_i2c_echo_send(DEVICE(s)->canonical_path, data);
if (state->pos > 2) { if (state->pos > 2) {
return -1; return -1;
} }

5
hw/misc/trace-events
View file

@ -390,3 +390,8 @@ ivshmem_flat_read_write_mmr_invalid(uint64_t addr_offset) "No ivshmem register m
ivshmem_flat_interrupt_invalid_peer(uint16_t peer_id) "Can't interrupt non-existing peer %u" ivshmem_flat_interrupt_invalid_peer(uint16_t peer_id) "Can't interrupt non-existing peer %u"
ivshmem_flat_write_mmr(uint64_t addr_offset) "Write access at offset %"PRIu64 ivshmem_flat_write_mmr(uint64_t addr_offset) "Write access at offset %"PRIu64
ivshmem_flat_interrupt_peer(uint16_t peer_id, uint16_t vector_id) "Interrupting peer ID %u, vector %u..." ivshmem_flat_interrupt_peer(uint16_t peer_id, uint16_t vector_id) "Interrupting peer ID %u, vector %u..."
# i2c-echo.c
i2c_echo_event(const char *id, const char *event) "%s: %s"
i2c_echo_recv(const char *id, uint8_t data) "%s: recv 0x%02" PRIx8
i2c_echo_send(const char *id, uint8_t data) "%s: send 0x%02" PRIx8