diff options
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index bc8fc860c473..1b817ec1192c 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -277,8 +277,41 @@ static ssize_t trigger_cntr_store(struct device *dev, } static DEVICE_ATTR_RW(trigger_cntr); +static ssize_t buffer_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + return sprintf(buf, "%#x\n", drvdata->size); +} + +static ssize_t buffer_size_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + unsigned long val; + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + /* Only permitted for TMC-ETRs */ + if (drvdata->config_type != TMC_CONFIG_TYPE_ETR) + return -EPERM; + + ret = kstrtoul(buf, 0, &val); + if (ret) + return ret; + /* The buffer size should be page aligned */ + if (val & (PAGE_SIZE - 1)) + return -EINVAL; + drvdata->size = val; + return size; +} + +static DEVICE_ATTR_RW(buffer_size); + static struct attribute *coresight_tmc_attrs[] = { &dev_attr_trigger_cntr.attr, + &dev_attr_buffer_size.attr, NULL, }; |