[PATCH] perf/arm_dmc620: Add cpumask

[Robin Murphy]

On 2023-06-13 02:34, Xin Yang wrote:
> Add a cpumask for the DMC620 PMU. As it is an uncore PMU, perf
> userspace tool only needs to open a single counter on the CPU
> specified by the CPU mask for each event on a given DMC620 device.

Reviewed-by: Robin Murphy <robin.murphy at arm.com>

> Signed-off-by: Xin Yang <xin.yang at arm.com>
> ---
>   drivers/perf/arm_dmc620_pmu.c | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c
> index 5de06f9a4dd3..9d0f01c4455a 100644
> --- a/drivers/perf/arm_dmc620_pmu.c
> +++ b/drivers/perf/arm_dmc620_pmu.c
> @@ -227,9 +227,31 @@ static const struct attribute_group dmc620_pmu_format_attr_group = {
>   	.attrs	= dmc620_pmu_formats_attrs,
>   };
>   
> +static ssize_t dmc620_pmu_cpumask_show(struct device *dev,
> +				       struct device_attribute *attr, char *buf)
> +{
> +	struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(dev_get_drvdata(dev));
> +
> +	return cpumap_print_to_pagebuf(true, buf,
> +				       cpumask_of(dmc620_pmu->irq->cpu));
> +}
> +
> +static struct device_attribute dmc620_pmu_cpumask_attr =
> +	__ATTR(cpumask, 0444, dmc620_pmu_cpumask_show, NULL);
> +
> +static struct attribute *dmc620_pmu_cpumask_attrs[] = {
> +	&dmc620_pmu_cpumask_attr.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group dmc620_pmu_cpumask_attr_group = {
> +	.attrs = dmc620_pmu_cpumask_attrs,
> +};
> +
>   static const struct attribute_group *dmc620_pmu_attr_groups[] = {
>   	&dmc620_pmu_events_attr_group,
>   	&dmc620_pmu_format_attr_group,
> +	&dmc620_pmu_cpumask_attr_group,
>   	NULL,
>   };
>