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Commit 56ec1978 authored by Mark Brown's avatar Mark Brown
Browse files

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: default avatarMark Brown <broonie@linaro.org>
parent d0e639c9

drivers/spi/spi.c

+15 −1
Original line number Diff line number Diff line
@@ -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);

}

include/trace/events/spi.h

0 → 100644
+94 −0
Original line number Diff line number Diff line 
#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>