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spi/trace: include buffer contents in traces

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It highly improves usability when the buffer contents are inspecable via
tracing.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Uwe Kleine-König 2018-12-21 11:35:36 +01:00 committed by Mark Brown
parent 983f6ae944
commit 8d245475c3
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GPG Key ID: 24D68B725D5487D0
1 changed files with 26 additions and 2 deletions
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28
include/trace/events/spi.h
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@ -109,6 +109,16 @@ TRACE_EVENT(spi_message_done,
(unsigned)__entry->actual, (unsigned)__entry->frame)
);
/*
* consider a buffer valid if non-NULL and if it doesn't match the dummy buffer
* that only exist to work with controllers that have SPI_CONTROLLER_MUST_TX or
* SPI_CONTROLLER_MUST_RX.
*/
#define spi_valid_txbuf(msg, xfer) \
(xfer->tx_buf && xfer->tx_buf != msg->spi->controller->dummy_tx)
#define spi_valid_rxbuf(msg, xfer) \
(xfer->rx_buf && xfer->rx_buf != msg->spi->controller->dummy_rx)
DECLARE_EVENT_CLASS(spi_transfer,
TP_PROTO(struct spi_message *msg, struct spi_transfer *xfer),
@ -120,6 +130,10 @@ DECLARE_EVENT_CLASS(spi_transfer,
__field( int, chip_select )
__field( struct spi_transfer *, xfer )
__field( int, len )
__dynamic_array(u8, rx_buf,
spi_valid_rxbuf(msg, xfer) ? xfer->len : 0)
__dynamic_array(u8, tx_buf,
spi_valid_txbuf(msg, xfer) ? xfer->len : 0)
),
TP_fast_assign(
@ -127,11 +141,21 @@ DECLARE_EVENT_CLASS(spi_transfer,
__entry->chip_select = msg->spi->chip_select;
__entry->xfer = xfer;
__entry->len = xfer->len;
if (spi_valid_txbuf(msg, xfer))
memcpy(__get_dynamic_array(tx_buf),
xfer->tx_buf, xfer->len);
if (spi_valid_rxbuf(msg, xfer))
memcpy(__get_dynamic_array(rx_buf),
xfer->rx_buf, xfer->len);
),
TP_printk("spi%d.%d %p len=%d",
TP_printk("spi%d.%d %p len=%d tx=[%*phD] rx=[%*phD]",
__entry->bus_num, __entry->chip_select,
__entry->xfer, __entry->len)
__entry->xfer, __entry->len,
__get_dynamic_array_len(tx_buf), __get_dynamic_array(tx_buf),
__get_dynamic_array_len(rx_buf), __get_dynamic_array(rx_buf))
);
DEFINE_EVENT(spi_transfer, spi_transfer_start,