Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0067b4c1 authored by Pratik Patel's avatar Pratik Patel Committed by Shashank Mittal
Browse files

coresight-etm4x: Controls pertaining to various configuration options 



Adding sysfs entries to configure:
. global timestamp.
. how often trace synchronisation occur.
. the threashold value for cycle counting.
. branch and broadcasting regions.

Change-Id: I4420fa4193f480b2a85f586b5a0e11a4071a9442
Signed-off-by: default avatarPratik Patel <pratikp@codeaurora.org>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: b460daf87b42f83f5c7030589f190a3215167bb8
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: default avatarShashank Mittal <mittals@codeaurora.org>
parent 1e7580df

Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x

+26 −0
Original line number Diff line number Diff line
@@ -108,3 +108,29 @@ Date: April 2015 
KernelVersion:	4.01

Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Controls the behavior of the events in bank 0 to 3.



What:		/sys/bus/coresight/devices/<memory_map>.etm/event_ts

Date:		April 2015

KernelVersion:	4.01

Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Controls the insertion of global timestamps in the trace

		streams.



What:		/sys/bus/coresight/devices/<memory_map>.etm/syncfreq

Date:		April 2015

KernelVersion:	4.01

Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Controls how often trace synchronization requests occur.



What:		/sys/bus/coresight/devices/<memory_map>.etm/cyc_threshold

Date:		April 2015

KernelVersion:	4.01

Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Sets the threshold value for cycle counting.



What:		/sys/bus/coresight/devices/<memory_map>.etm/bb_ctrl

Date:		April 2015

KernelVersion:	4.01

Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Controls which regions in the memory map are enabled to

		use branch broadcasting.

drivers/hwtracing/coresight/coresight-etm4x.c

+124 −0
Original line number Diff line number Diff line
@@ -812,6 +812,126 @@ static ssize_t event_instren_store(struct device *dev, 
}

static DEVICE_ATTR_RW(event_instren);



static ssize_t event_ts_show(struct device *dev,

			     struct device_attribute *attr,

			     char *buf)

{

	unsigned long val;

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



	val = drvdata->ts_ctrl;

	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);

}



static ssize_t event_ts_store(struct device *dev,

			      struct device_attribute *attr,

			      const char *buf, size_t size)

{

	unsigned long val;

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



	if (kstrtoul(buf, 16, &val))

		return -EINVAL;

	if (!drvdata->ts_size)

		return -EINVAL;



	drvdata->ts_ctrl = val & ETMv4_EVENT_MASK;

	return size;

}

static DEVICE_ATTR_RW(event_ts);



static ssize_t syncfreq_show(struct device *dev,

			     struct device_attribute *attr,

			     char *buf)

{

	unsigned long val;

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



	val = drvdata->syncfreq;

	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);

}



static ssize_t syncfreq_store(struct device *dev,

			      struct device_attribute *attr,

			      const char *buf, size_t size)

{

	unsigned long val;

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



	if (kstrtoul(buf, 16, &val))

		return -EINVAL;

	if (drvdata->syncpr == true)

		return -EINVAL;



	drvdata->syncfreq = val & ETMv4_SYNC_MASK;

	return size;

}

static DEVICE_ATTR_RW(syncfreq);



static ssize_t cyc_threshold_show(struct device *dev,

				  struct device_attribute *attr,

				  char *buf)

{

	unsigned long val;

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



	val = drvdata->ccctlr;

	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);

}



static ssize_t cyc_threshold_store(struct device *dev,

				   struct device_attribute *attr,

				   const char *buf, size_t size)

{

	unsigned long val;

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



	if (kstrtoul(buf, 16, &val))

		return -EINVAL;

	if (val < drvdata->ccitmin)

		return -EINVAL;



	drvdata->ccctlr = val & ETM_CYC_THRESHOLD_MASK;

	return size;

}

static DEVICE_ATTR_RW(cyc_threshold);



static ssize_t bb_ctrl_show(struct device *dev,

			    struct device_attribute *attr,

			    char *buf)

{

	unsigned long val;

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



	val = drvdata->bb_ctrl;

	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);

}



static ssize_t bb_ctrl_store(struct device *dev,

			     struct device_attribute *attr,

			     const char *buf, size_t size)

{

	unsigned long val;

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



	if (kstrtoul(buf, 16, &val))

		return -EINVAL;

	if (drvdata->trcbb == false)

		return -EINVAL;

	if (!drvdata->nr_addr_cmp)

		return -EINVAL;

	/*

	 * Bit[7:0] selects which address range comparator is used for

	 * branch broadcast control.

	 */

	if (BMVAL(val, 0, 7) > drvdata->nr_addr_cmp)

		return -EINVAL;



	drvdata->bb_ctrl = val;

	return size;

}

static DEVICE_ATTR_RW(bb_ctrl);



static ssize_t cpu_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{
@@ -839,6 +959,10 @@ static struct attribute *coresight_etmv4_attrs[] = { 
	&dev_attr_pe.attr,

	&dev_attr_event.attr,

	&dev_attr_event_instren.attr,

	&dev_attr_event_ts.attr,

	&dev_attr_syncfreq.attr,

	&dev_attr_cyc_threshold.attr,

	&dev_attr_bb_ctrl.attr,

	&dev_attr_cpu.attr,

	NULL,

};