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hw/char/pl011: Improve RX flow tracing events

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Log FIFO use (availability and depth).

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luc Michel <luc.michel@amd.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250220092903.3726-4-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-02-19 15:37:08 +01:00
parent f33af61dba
commit 2c459f734d
2 changed files with 10 additions and 7 deletions
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10
hw/char/pl011.c
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@ -185,7 +185,7 @@ static void pl011_fifo_rx_put(void *opaque, uint32_t value)
s->read_fifo[slot] = value;
s->read_count++;
s->flags &= ~PL011_FLAG_RXFE;
trace_pl011_fifo_rx_put(value, s->read_count);
trace_pl011_fifo_rx_put(value, s->read_count, pipe_depth);
if (s->read_count == pipe_depth) {
trace_pl011_fifo_rx_full();
s->flags |= PL011_FLAG_RXFF;
@ -248,12 +248,13 @@ static void pl011_write_txdata(PL011State *s, uint8_t data)
static uint32_t pl011_read_rxdata(PL011State *s)
{
uint32_t c;
unsigned fifo_depth = pl011_get_fifo_depth(s);
s->flags &= ~PL011_FLAG_RXFF;
c = s->read_fifo[s->read_pos];
if (s->read_count > 0) {
s->read_count--;
s->read_pos = (s->read_pos + 1) & (pl011_get_fifo_depth(s) - 1);
s->read_pos = (s->read_pos + 1) & (fifo_depth - 1);
}
if (s->read_count == 0) {
s->flags |= PL011_FLAG_RXFE;
@ -261,7 +262,7 @@ static uint32_t pl011_read_rxdata(PL011State *s)
if (s->read_count == s->read_trigger - 1) {
s->int_level &= ~INT_RX;
}
trace_pl011_read_fifo(s->read_count);
trace_pl011_read_fifo(s->read_count, fifo_depth);
s->rsr = c >> 8;
pl011_update(s);
qemu_chr_fe_accept_input(&s->chr);
@ -498,12 +499,13 @@ static int pl011_can_receive(void *opaque)
qemu_log_mask(LOG_GUEST_ERROR,
"PL011 receiving data on disabled RX UART\n");
}
trace_pl011_can_receive(s->lcr, s->read_count, r);
trace_pl011_can_receive(s->lcr, s->read_count, fifo_depth, fifo_available);
return r;
}
static void pl011_receive(void *opaque, const uint8_t *buf, int size)
{
trace_pl011_receive(size);
/*
* In loopback mode, the RX input signal is internally disconnected
* from the entire receiving logics; thus, all inputs are ignored,