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Commit 9cf2c224 authored by Pratik Patel's avatar Pratik Patel Committed by Shashank Mittal
Browse files

coresight-etm4x: Controls pertaining to the counter functions 



Adding sysfs entries related to the counter functionality, more
specifically to set, control and reload the counters.

Change-Id: I0445a3e33bdee5d0a8c85ca69981007b3b4a19f1
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: add2d5d0d15fe391e42b8b220590ed02ba0aad16
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: default avatarShashank Mittal <mittals@codeaurora.org>
parent d87abec2

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

+26 −0
Original line number Diff line number Diff line
@@ -204,3 +204,29 @@ KernelVersion: 4.01 
Contact:	Mathieu Poirier <mathieu.poirier@linaro.org>

Description: 	(RW) Moves the sequencer to state 0 when a programmed event

		occurs.



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

Date:		April 2015

KernelVersion:	4.01

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

Description: 	(RW) Select which counter unit to work with.



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

Date:		April 2015

KernelVersion:	4.01

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

Description: 	(RW) This sets or returns the reload count value of the

		specific counter.



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

Date:		April 2015

KernelVersion:	4.01

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

Description: 	(RW) This sets or returns the current count value of the

                specific counter.



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

Date:		April 2015

KernelVersion:	4.01

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

Description: 	(RW) Controls the operation of the selected counter.

drivers/hwtracing/coresight/coresight-etm4x.c

+144 −0
Original line number Diff line number Diff line
@@ -1567,6 +1567,146 @@ static ssize_t seq_reset_event_store(struct device *dev, 
}

static DEVICE_ATTR_RW(seq_reset_event);



static ssize_t cntr_idx_show(struct device *dev,

			     struct device_attribute *attr,

			     char *buf)

{

	unsigned long val;

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



	val = drvdata->cntr_idx;

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

}



static ssize_t cntr_idx_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->nr_cntr)

		return -EINVAL;



	/*

	 * Use spinlock to ensure index doesn't change while it gets

	 * dereferenced multiple times within a spinlock block elsewhere.

	 */

	spin_lock(&drvdata->spinlock);

	drvdata->cntr_idx = val;

	spin_unlock(&drvdata->spinlock);

	return size;

}

static DEVICE_ATTR_RW(cntr_idx);



static ssize_t cntrldvr_show(struct device *dev,

			     struct device_attribute *attr,

			     char *buf)

{

	u8 idx;

	unsigned long val;

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



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	val = drvdata->cntrldvr[idx];

	spin_unlock(&drvdata->spinlock);

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

}



static ssize_t cntrldvr_store(struct device *dev,

			      struct device_attribute *attr,

			      const char *buf, size_t size)

{

	u8 idx;

	unsigned long val;

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



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

		return -EINVAL;

	if (val > ETM_CNTR_MAX_VAL)

		return -EINVAL;



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	drvdata->cntrldvr[idx] = val;

	spin_unlock(&drvdata->spinlock);

	return size;

}

static DEVICE_ATTR_RW(cntrldvr);



static ssize_t cntr_val_show(struct device *dev,

			     struct device_attribute *attr,

			     char *buf)

{

	u8 idx;

	unsigned long val;

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



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	val = drvdata->cntr_val[idx];

	spin_unlock(&drvdata->spinlock);

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

}



static ssize_t cntr_val_store(struct device *dev,

			      struct device_attribute *attr,

			      const char *buf, size_t size)

{

	u8 idx;

	unsigned long val;

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



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

		return -EINVAL;

	if (val > ETM_CNTR_MAX_VAL)

		return -EINVAL;



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	drvdata->cntr_val[idx] = val;

	spin_unlock(&drvdata->spinlock);

	return size;

}

static DEVICE_ATTR_RW(cntr_val);



static ssize_t cntr_ctrl_show(struct device *dev,

			      struct device_attribute *attr,

			      char *buf)

{

	u8 idx;

	unsigned long val;

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



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	val = drvdata->cntr_ctrl[idx];

	spin_unlock(&drvdata->spinlock);

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

}



static ssize_t cntr_ctrl_store(struct device *dev,

			       struct device_attribute *attr,

			       const char *buf, size_t size)

{

	u8 idx;

	unsigned long val;

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



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

		return -EINVAL;



	spin_lock(&drvdata->spinlock);

	idx = drvdata->cntr_idx;

	drvdata->cntr_ctrl[idx] = val;

	spin_unlock(&drvdata->spinlock);

	return size;

}

static DEVICE_ATTR_RW(cntr_ctrl);



static ssize_t cpu_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{
@@ -1613,6 +1753,10 @@ static struct attribute *coresight_etmv4_attrs[] = { 
	&dev_attr_seq_state.attr,

	&dev_attr_seq_event.attr,

	&dev_attr_seq_reset_event.attr,

	&dev_attr_cntr_idx.attr,

	&dev_attr_cntrldvr.attr,

	&dev_attr_cntr_val.attr,

	&dev_attr_cntr_ctrl.attr,

	&dev_attr_cpu.attr,

	NULL,

};