diff options
| author |   Mike Leach <mike.leach@linaro.org> | 2017-01-23 10:41:23 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-25 11:46:42 +0100 |
| commit | ae3fabcda00de54029b5342a3d6d82d65e7c4e6b (patch) | |
| tree | 4e9fb58499f1562e82921c486b784421b2458039 /drivers/hwtracing | |
| parent | coresight: fix kernel panic caused by invalid CPU (diff) | |
| download | linux-dev-ae3fabcda00de54029b5342a3d6d82d65e7c4e6b.tar.xz linux-dev-ae3fabcda00de54029b5342a3d6d82d65e7c4e6b.zip | |
coresight: etm4x: Fix enabling of cycle accurate tracing in perf.
Using perf record 'cyclacc' option in cs_etm event was not setting up cycle
accurate trace correctly.
Corrects bit set in TRCCONFIGR to enable cycle accurate trace.
Programs TRCCCCTLR with a valid threshold value as required by ETMv4 spec.
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 7 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 1 |
2 files changed, 6 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 031480f2c34d..f432febdda49 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -216,8 +216,11 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, goto out; /* Go from generic option to ETMv4 specifics */ - if (attr->config & BIT(ETM_OPT_CYCACC)) - config->cfg |= ETMv4_MODE_CYCACC; + if (attr->config & BIT(ETM_OPT_CYCACC)) { + config->cfg |= BIT(4); + /* TRM: Must program this for cycacc to work */ + config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT; + } if (attr->config & BIT(ETM_OPT_TS)) config->cfg |= ETMv4_MODE_TIMESTAMP; diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index ba8d3f86de21..b3b5ea7b7fb3 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -146,6 +146,7 @@ #define ETM_ARCH_V4 0x40 #define ETMv4_SYNC_MASK 0x1F #define ETM_CYC_THRESHOLD_MASK 0xFFF +#define ETM_CYC_THRESHOLD_DEFAULT 0x100 #define ETMv4_EVENT_MASK 0xFF #define ETM_CNTR_MAX_VAL 0xFFFF #define ETM_TRACEID_MASK 0x3f |