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authorMike Leach <mike.leach@linaro.org>2017-01-23 20:41:23 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-25 13:46:42 +0300
commitae3fabcda00de54029b5342a3d6d82d65e7c4e6b (patch)
tree4e9fb58499f1562e82921c486b784421b2458039 /drivers/hwtracing/coresight
parentf09444639099584bc4784dfcd85ada67c6f33e0f (diff)
downloadlinux-ae3fabcda00de54029b5342a3d6d82d65e7c4e6b.tar.xz
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/coresight')
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x.c7
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x.h1
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