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coresight: etm3x: adding cpu affinity to sysFS interface

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Without access to the device tree, it is impossible to know
what CPU a tracer is affined to.  As such adding a new sysFS
interface to convey the information.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2015-10-07 09:26:41 -06:00 • committed by Greg Kroah-Hartman
parent 58b8d51b84
commit adfad8745c
1 changed files with 13 additions and 0 deletions
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13
drivers/hwtracing/coresight/coresight-etm3x.c
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@ -1545,6 +1545,18 @@ static ssize_t status_show(struct device *dev,
} }
static DEVICE_ATTR_RO(status); static DEVICE_ATTR_RO(status);
static ssize_t cpu_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int val;
struct etm_drvdata *drvdata = dev_get_drvdata(dev->parent);
val = drvdata->cpu;
return scnprintf(buf, PAGE_SIZE, "%d\n", val);
}
static DEVICE_ATTR_RO(cpu);
static ssize_t traceid_show(struct device *dev, static ssize_t traceid_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
@ -1621,6 +1633,7 @@ static struct attribute *coresight_etm_attrs[] = {
&dev_attr_timestamp_event.attr, &dev_attr_timestamp_event.attr,
&dev_attr_status.attr, &dev_attr_status.attr,
&dev_attr_traceid.attr, &dev_attr_traceid.attr,
&dev_attr_cpu.attr,
NULL, NULL,
}; };
ATTRIBUTE_GROUPS(coresight_etm); ATTRIBUTE_GROUPS(coresight_etm);