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Commit 52210c87 authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Greg Kroah-Hartman
Browse files

coresight: implementing 'cpu_id()' API 



Other than plainly parsing the device tree there is no way to
know which CPU a tracer is affined to.  As such adding an
interface to lookup the CPU field enclosed in the etm_drvdata
structure that was initialised at boot time.

Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b15f0fb6

drivers/hwtracing/coresight/coresight-etm3x.c

+8 −0
Original line number Original line Diff line number Diff line
@@ -315,6 +315,13 @@ static void etm_enable_hw(void *info) 
	dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);

	dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);

}

}





static int etm_cpu_id(struct coresight_device *csdev)

{

	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	return drvdata->cpu;

}



static int etm_trace_id(struct coresight_device *csdev)

static int etm_trace_id(struct coresight_device *csdev)

{

{

	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
@@ -421,6 +428,7 @@ static void etm_disable(struct coresight_device *csdev) 
}

}





static const struct coresight_ops_source etm_source_ops = {

static const struct coresight_ops_source etm_source_ops = {

	.cpu_id		= etm_cpu_id,

	.trace_id	= etm_trace_id,

	.trace_id	= etm_trace_id,

	.enable		= etm_enable,

	.enable		= etm_enable,

	.disable	= etm_disable,

	.disable	= etm_disable,

drivers/hwtracing/coresight/coresight-etm4x.c

+8 −0
Original line number Original line Diff line number Diff line
@@ -63,6 +63,13 @@ static bool etm4_arch_supported(u8 arch) 
	return true;

	return true;

}

}





static int etm4_cpu_id(struct coresight_device *csdev)

{

	struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	return drvdata->cpu;

}



static int etm4_trace_id(struct coresight_device *csdev)

static int etm4_trace_id(struct coresight_device *csdev)

{

{

	struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

	struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
@@ -262,6 +269,7 @@ static void etm4_disable(struct coresight_device *csdev) 
}

}





static const struct coresight_ops_source etm4_source_ops = {

static const struct coresight_ops_source etm4_source_ops = {

	.cpu_id		= etm4_cpu_id,

	.trace_id	= etm4_trace_id,

	.trace_id	= etm4_trace_id,

	.enable		= etm4_enable,

	.enable		= etm4_enable,

	.disable	= etm4_disable,

	.disable	= etm4_disable,

include/linux/coresight.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -205,12 +205,15 @@ struct coresight_ops_link { 
/**

/**

 * struct coresight_ops_source - basic operations for a source

 * struct coresight_ops_source - basic operations for a source

 * Operations available for sources.

 * Operations available for sources.

 * @cpu_id:	returns the value of the CPU number this component

 *		is associated to.

 * @trace_id:	returns the value of the component's trace ID as known

 * @trace_id:	returns the value of the component's trace ID as known

		to the HW.

		to the HW.

 * @enable:	enables tracing for a source.

 * @enable:	enables tracing for a source.

 * @disable:	disables tracing for a source.

 * @disable:	disables tracing for a source.

 */

 */

struct coresight_ops_source {

struct coresight_ops_source {

	int (*cpu_id)(struct coresight_device *csdev);

	int (*trace_id)(struct coresight_device *csdev);

	int (*trace_id)(struct coresight_device *csdev);

	int (*enable)(struct coresight_device *csdev);

	int (*enable)(struct coresight_device *csdev);

	void (*disable)(struct coresight_device *csdev);

	void (*disable)(struct coresight_device *csdev);