diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm3x.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm3x.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index 9d8bd4e36b32..9c010eb9497f 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -310,7 +310,9 @@ void etm_config_trace_mode(struct etm_config *config) config->addr_type[1] = ETM_ADDR_TYPE_RANGE; } -#define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | ETMCR_TIMESTAMP_EN) +#define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | \ + ETMCR_TIMESTAMP_EN | \ + ETMCR_RETURN_STACK) static int etm_parse_event_config(struct etm_drvdata *drvdata, struct perf_event *event) @@ -341,14 +343,24 @@ static int etm_parse_event_config(struct etm_drvdata *drvdata, etm_config_trace_mode(config); /* - * At this time only cycle accurate and timestamp options are - * available. + * 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; } |