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Subject[PATCH] coresight: etm3x: adding cpu affinity to sysFS interface
Date
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>
---
drivers/hwtracing/coresight/coresight-etm3x.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index bf2476ed9356..4797f56e7f13 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -1545,6 +1545,18 @@ static ssize_t status_show(struct device *dev,
}
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,
struct device_attribute *attr, char *buf)
{
@@ -1621,6 +1633,7 @@ static struct attribute *coresight_etm_attrs[] = {
&dev_attr_timestamp_event.attr,
&dev_attr_status.attr,
&dev_attr_traceid.attr,
+ &dev_attr_cpu.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etm);
--
1.9.1


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