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coresight-etm4x: Controls pertaining to the counter functions

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

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 10:34:16 -06:00 committed by Greg Kroah-Hartman
parent 5e5ff34406
commit add2d5d0d1
2 changed files with 170 additions and 0 deletions
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26
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
View file

@ -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.

144
drivers/hwtracing/coresight/coresight-etm4x.c
View file

@ -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,
};