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spi: Provide trace points for message processing 

Provide tracepoints for the lifecycle of a message from submission to
completion and for the active time for masters to help with performance
analysis of SPI I/O.

Signed-off-by: Mark Brown <broonie@linaro.org>
hifive-unleashed-5.1
Mark Brown 2013-10-07 19:33:53 +01:00
parent d0e639c9e0
commit 56ec1978ff
2 changed files with 109 additions and 1 deletions
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16
drivers/spi/spi.c
View File

@ -39,6 +39,9 @@
#include <linux/ioport.h>
#include <linux/acpi.h>
#define CREATE_TRACE_POINTS
#include <trace/events/spi.h>
static void spidev_release(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
@ -557,6 +560,7 @@ static void spi_pump_messages(struct kthread_work *work)
pm_runtime_mark_last_busy(master->dev.parent);
pm_runtime_put_autosuspend(master->dev.parent);
}
trace_spi_master_idle(master);
return;
}
@ -585,6 +589,9 @@ static void spi_pump_messages(struct kthread_work *work)
}
}
if (!was_busy)
trace_spi_master_busy(master);
if (!was_busy && master->prepare_transfer_hardware) {
ret = master->prepare_transfer_hardware(master);
if (ret) {
@ -597,6 +604,8 @@ static void spi_pump_messages(struct kthread_work *work)
}
}
trace_spi_message_start(master->cur_msg);
ret = master->transfer_one_message(master, master->cur_msg);
if (ret) {
dev_err(&master->dev,
@ -689,6 +698,8 @@ void spi_finalize_current_message(struct spi_master *master)
mesg->state = NULL;
if (mesg->complete)
mesg->complete(mesg->context);
trace_spi_message_done(mesg);
}
EXPORT_SYMBOL_GPL(spi_finalize_current_message);
@ -1421,6 +1432,10 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
struct spi_master *master = spi->master;
struct spi_transfer *xfer;
message->spi = spi;
trace_spi_message_submit(message);
if (list_empty(&message->transfers))
return -EINVAL;
if (!message->complete)
@ -1520,7 +1535,6 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
}
}
message->spi = spi;
message->status = -EINPROGRESS;
return master->transfer(spi, message);
}

94
include/trace/events/spi.h 100644
View File

@ -0,0 +1,94 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM spi
#if !defined(_TRACE_SPI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SPI_H
#include <linux/ktime.h>
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(spi_master,
TP_PROTO(struct spi_master *master),
TP_ARGS(master),
TP_STRUCT__entry(
__field( int, bus_num )
),
TP_fast_assign(
__entry->bus_num = master->bus_num;
),
TP_printk("spi%d", (int)__entry->bus_num)
);
DEFINE_EVENT(spi_master, spi_master_idle,
TP_PROTO(struct spi_master *master),
TP_ARGS(master)
);
DEFINE_EVENT(spi_master, spi_master_busy,
TP_PROTO(struct spi_master *master),
TP_ARGS(master)
);
DECLARE_EVENT_CLASS(spi_message,
TP_PROTO(struct spi_message *msg),
TP_ARGS(msg),
TP_STRUCT__entry(
__field( int, bus_num )
__field( int, chip_select )
__field( struct spi_message *, msg )
),
TP_fast_assign(
__entry->bus_num = msg->spi->master->bus_num;
__entry->chip_select = msg->spi->chip_select;
__entry->msg = msg;
),
TP_printk("spi%d.%d %p", (int)__entry->bus_num,
(int)__entry->chip_select,
(struct spi_message *)__entry->msg)
);
DEFINE_EVENT(spi_message, spi_message_submit,
TP_PROTO(struct spi_message *msg),
TP_ARGS(msg)
);
DEFINE_EVENT(spi_message, spi_message_start,
TP_PROTO(struct spi_message *msg),
TP_ARGS(msg)
);
DEFINE_EVENT(spi_message, spi_message_done,
TP_PROTO(struct spi_message *msg),
TP_ARGS(msg)
);
#endif /* _TRACE_POWER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>