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coresight-etm4x: Controls pertaining to various configuration options

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

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratik Patel 2015-05-13 10:34:12 -06:00 committed by Greg Kroah-Hartman
parent d8c6696208
commit b460daf87b
2 changed files with 150 additions and 0 deletions
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26
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
View file

@ -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.

124
drivers/hwtracing/coresight/coresight-etm4x.c
View file

@ -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,
};