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coresight: etm4x: Add kernel configuration for CONTEXTID

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Set the proper bit in the configuration register when contextID tracing
has been requested by user space.  That way PE_CONTEXT elements are
generated by the tracers when a process is installed on a CPU.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2019-04-25 13:52:52 -06:00 committed by Greg Kroah-Hartman
parent 6fcdba33ab
commit 82500a810e
5 changed files with 12 additions and 0 deletions
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1
drivers/hwtracing/coresight/Kconfig
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@ -75,6 +75,7 @@ config CORESIGHT_SOURCE_ETM4X
bool "CoreSight Embedded Trace Macrocell 4.x driver"
depends on ARM64
select CORESIGHT_LINKS_AND_SINKS
select PID_IN_CONTEXTIDR
help
This driver provides support for the ETM4.x tracer module, tracing the
instructions that a processor is executing. This is primarily useful

2
drivers/hwtracing/coresight/coresight-etm-perf.c
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@ -29,6 +29,7 @@ static DEFINE_PER_CPU(struct coresight_device *, csdev_src);
/* ETMv3.5/PTM's ETMCR is 'config' */
PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC));
PMU_FORMAT_ATTR(contextid, "config:" __stringify(ETM_OPT_CTXTID));
PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS));
PMU_FORMAT_ATTR(retstack, "config:" __stringify(ETM_OPT_RETSTK));
/* Sink ID - same for all ETMs */
@ -36,6 +37,7 @@ PMU_FORMAT_ATTR(sinkid, "config2:0-31");
static struct attribute *etm_config_formats_attr[] = {
&format_attr_cycacc.attr,
&format_attr_contextid.attr,
&format_attr_timestamp.attr,
&format_attr_retstack.attr,
&format_attr_sinkid.attr,

5
drivers/hwtracing/coresight/coresight-etm4x.c
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@ -239,6 +239,11 @@ 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);
if (attr->config & BIT(ETM_OPT_CTXTID))
/* bit[6], Context ID tracing bit */
config->cfg |= BIT(ETM4_CFG_BIT_CTXTID);
/* return stack - enable if selected and supported */
if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
/* bit[12], Return stack enable bit */

2
include/linux/coresight-pmu.h
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@ -12,11 +12,13 @@
/* ETMv3.5/PTM's ETMCR config bit */
#define ETM_OPT_CYCACC 12
#define ETM_OPT_CTXTID 14
#define ETM_OPT_TS 28
#define ETM_OPT_RETSTK 29
/* ETMv4 CONFIGR programming bits for the ETM OPTs */
#define ETM4_CFG_BIT_CYCACC 4
#define ETM4_CFG_BIT_CTXTID 6
#define ETM4_CFG_BIT_TS 11
#define ETM4_CFG_BIT_RETSTK 12

2
tools/include/linux/coresight-pmu.h
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@ -12,11 +12,13 @@
/* ETMv3.5/PTM's ETMCR config bit */
#define ETM_OPT_CYCACC 12
#define ETM_OPT_CTXTID 14
#define ETM_OPT_TS 28
#define ETM_OPT_RETSTK 29
/* ETMv4 CONFIGR programming bits for the ETM OPTs */
#define ETM4_CFG_BIT_CYCACC 4
#define ETM4_CFG_BIT_CTXTID 6
#define ETM4_CFG_BIT_TS 11
#define ETM4_CFG_BIT_RETSTK 12