static int etm_parse_event_config(struct etm_drvdata *drvdata,
struct perf_event *event)
{
struct etm_config *config = &drvdata->config;
struct perf_event_attr *attr = &event->attr;
if (!attr)
return -EINVAL;
/* Clear configuration from previous run */
memset(config, 0, sizeof(struct etm_config));
if (attr->exclude_kernel)
config->mode = ETM_MODE_EXCL_KERN;
if (attr->exclude_user)
config->mode = ETM_MODE_EXCL_USER;
/* Always start from the default config */
etm_set_default(config);
/*
* By default the tracers are configured to trace the whole address
* range. Narrow the field only if requested by user space.
*/
if (config->mode)
etm_config_trace_mode(config);
/*
* At this time only cycle accurate, return stack and timestamp
* options are available.
*/
if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
return -EINVAL;
config->ctrl = attr->config;
/*
* Possible to have cores with PTM (supports ret stack) and ETM
* (never has ret stack) on the same SoC. So if we have a request
* for return stack that can't be honoured on this core then
* clear the bit - trace will still continue normally
*/
if ((config->ctrl & ETMCR_RETURN_STACK) &&
!(drvdata->etmccer & ETMCCER_RETSTACK))
config->ctrl &= ~ETMCR_RETURN_STACK;
return 0;
}
static int etm_parse_event_config(struct etm_drvdata *drvdata,
struct perf_event_attr *attr)
{
struct etm_config *config = &drvdata->config;
if (!attr)
return -EINVAL;
/* Clear configuration from previous run */
memset(config, 0, sizeof(struct etm_config));
if (attr->exclude_kernel)
config->mode = ETM_MODE_EXCL_KERN;
if (attr->exclude_user)
config->mode = ETM_MODE_EXCL_USER;
/* Always start from the default config */
etm_set_default(config);
/*
* By default the tracers are configured to trace the whole address
* range. Narrow the field only if requested by user space.
*/
if (config->mode)
etm_config_trace_mode(config);
/*
* At this time only cycle accurate and timestamp options are
* available.
*/
if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
return -EINVAL;
config->ctrl = attr->config;
return 0;
}
static ssize_t mode_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret;
unsigned long val;
struct etm_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct etm_config *config = &drvdata->config;
ret = kstrtoul(buf, 16, &val);
if (ret)
return ret;
spin_lock(&drvdata->spinlock);
config->mode = val & ETM_MODE_ALL;
if (config->mode & ETM_MODE_EXCLUDE)
config->enable_ctrl1 |= ETMTECR1_INC_EXC;
else
config->enable_ctrl1 &= ~ETMTECR1_INC_EXC;
if (config->mode & ETM_MODE_CYCACC)
config->ctrl |= ETMCR_CYC_ACC;
else
config->ctrl &= ~ETMCR_CYC_ACC;
if (config->mode & ETM_MODE_STALL) {
if (!(drvdata->etmccr & ETMCCR_FIFOFULL)) {
dev_warn(drvdata->dev, "stall mode not supported\n");
ret = -EINVAL;
goto err_unlock;
}
config->ctrl |= ETMCR_STALL_MODE;
} else
config->ctrl &= ~ETMCR_STALL_MODE;
if (config->mode & ETM_MODE_TIMESTAMP) {
if (!(drvdata->etmccer & ETMCCER_TIMESTAMP)) {
dev_warn(drvdata->dev, "timestamp not supported\n");
ret = -EINVAL;
goto err_unlock;
}
config->ctrl |= ETMCR_TIMESTAMP_EN;
} else
config->ctrl &= ~ETMCR_TIMESTAMP_EN;
if (config->mode & ETM_MODE_CTXID)
config->ctrl |= ETMCR_CTXID_SIZE;
else
config->ctrl &= ~ETMCR_CTXID_SIZE;
if (config->mode & (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER))
etm_config_trace_mode(config);
spin_unlock(&drvdata->spinlock);
return size;
err_unlock:
spin_unlock(&drvdata->spinlock);
return ret;
}
