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coresight: etm4x: Adds trace return stack option programming for ETMv4. 

Adds handling to program the return stack option into ETMv4 hardware if
specified in the perf command line.

If option is not supported by the hardware then it will be ignored.
This allows capture to move between core/ETM combinations that have the
hardware support to those that do not.

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>
This commit is contained in:
Mike Leach 2017-08-02 10:22:03 -06:00 committed by Greg Kroah-Hartman
parent 557587bede
commit 27b8f6673a
1 changed files with 4 additions and 0 deletions
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4
drivers/hwtracing/coresight/coresight-etm4x.c
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@ -224,6 +224,10 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
if (attr->config & BIT(ETM_OPT_TS))
/* bit[11], Global timestamp tracing bit */
config->cfg |= BIT(11);
/* return stack - enable if selected and supported */
if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
/* bit[12], Return stack enable bit */
config->cfg |= BIT(12);
out:
return ret;