From: Pratik Patel <pratikp@xxxxxxxxxxxxxx> Adding sysfs entries related to the counter functionality, more specifically to set, control and reload the counters. Signed-off-by: Pratik Patel <pratikp@xxxxxxxxxxxxxx> Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> --- .../ABI/testing/sysfs-bus-coresight-devices-etm4x | 26 ++++ drivers/hwtracing/coresight/coresight-etm4x.c | 144 +++++++++++++++++++++ 2 files changed, 170 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x index 44723f2e107e..b4581c9426d3 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x @@ -216,3 +216,29 @@ KernelVersion: 4.01 Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> 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@xxxxxxxxxx> +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@xxxxxxxxxx> +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@xxxxxxxxxx> +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@xxxxxxxxxx> +Description: (RW) Controls the operation of the selected counter. diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index ca89e7ba4b75..7d22a630ec8a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -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 status_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1743,6 +1883,10 @@ 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_status.attr, &dev_attr_mgmt.attr, &dev_attr_trcidr.attr, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html