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Message-Id: <1429742451-11465-5-git-send-email-mathieu.poirier@linaro.org>
Date: Wed, 22 Apr 2015 16:40:44 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: gregkh@...uxfoundation.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-api@...r.kernel.org,
linux-kernel@...r.kernel.org, kaixu.xia@...aro.org,
zhang.chunyan@...aro.org, mathieu.poirier@...aro.org
Subject: [PATCH 04/11] coresight-etm4x: Controls pertaining to various configuration options
From: Pratik Patel <pratikp@...eaurora.org>
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@...eaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
.../ABI/testing/sysfs-bus-coresight-devices-etm4x | 28 ++++-
drivers/hwtracing/coresight/coresight-etm4x.c | 124 +++++++++++++++++++++
2 files changed, 151 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
index 9caf70382088..2aeae2976c10 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
@@ -119,4 +119,30 @@ What: /sys/bus/coresight/devices/<memory_map>.etm/event_instren
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@...aro.org>
-Description: (RW) Controls the behavior of the events in bank 0 to 3.
+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@...aro.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@...aro.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@...aro.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@...aro.org>
+Description: (RW) Controls which regions in the memory map are enabled to
+ use branch broadcasting.
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 73408c296699..dfe6a4cad43c 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -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 status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -969,6 +1089,10 @@ 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_status.attr,
&dev_attr_mgmt.attr,
&dev_attr_trcidr.attr,
--
1.9.1
--
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