Adding an interface to lookup the CPU a tracer has been affined to along with a source operation allowing external customers to access it.
Signed-off-by: Mathieu Poirier <[email protected]> --- drivers/hwtracing/coresight/coresight-etm3x.c | 14 ++++++++++++++ include/linux/coresight.h | 3 +++ 2 files changed, 17 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index a44bc3532585..4ce9cfc06e93 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -441,6 +441,19 @@ static void etm_config_enable(void *info) spin_unlock(&drvdata->spinlock); } +static int etm_cpu_id(struct coresight_device *csdev) +{ + int cpu; + unsigned long flags; + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + spin_lock_irqsave(&drvdata->spinlock, flags); + cpu = drvdata->cpu; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return cpu; +} + static int etm_trace_id(struct coresight_device *csdev) { struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); @@ -536,6 +549,7 @@ static void etm_disable(struct coresight_device *csdev) } static const struct coresight_ops_source etm_source_ops = { + .cpu_id = etm_cpu_id, .trace_id = etm_trace_id, .is_enabled = etm_is_enabled, .configure = etm_configure, diff --git a/include/linux/coresight.h b/include/linux/coresight.h index d16e874079b7..9fe2ccf1cc36 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -205,6 +205,8 @@ struct coresight_ops_link { /** * struct coresight_ops_source - basic operations for a source * Operations available for sources. + * @cpu_id: returns the value of the CPU number this component + * is associated to. * @trace_id: returns the value of the component's trace ID as known * to the HW. * @is_enabled: returns whether a source has been enabled or not. @@ -216,6 +218,7 @@ struct coresight_ops_link { * @poweroff: switch off power to a source. */ struct coresight_ops_source { + int (*cpu_id)(struct coresight_device *csdev); int (*trace_id)(struct coresight_device *csdev); bool (*is_enabled)(struct coresight_device *csdev); int (*configure)(struct coresight_device *csdev); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
