Re: [PATCH v7 3/5] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show processor details

[Michael Ellerman <mpe@ellerman.id.au>]

Kajol Jain <kjain@linux.ibm.com> writes:
> To expose the system dependent parameter like total number of
> sockets and numbers of chips per socket, patch adds two sysfs files.
> "sockets" and "chips" are added to /sys/devices/hv_24x7/interface/
> of the "hv_24x7" pmu.
>
> Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
> ---
>  arch/powerpc/perf/hv-24x7.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)

This should also add documentation under Documentation/ABI.

cheers

> diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
> index 9ae00f29bd21..a31bd5b88f7a 100644
> --- a/arch/powerpc/perf/hv-24x7.c
> +++ b/arch/powerpc/perf/hv-24x7.c
> @@ -454,6 +454,20 @@ static ssize_t device_show_string(struct device *dev,
>  	return sprintf(buf, "%s\n", (char *)d->var);
>  }
>  
> +#ifdef CONFIG_PPC_RTAS
> +static ssize_t sockets_show(struct device *dev,
> +			    struct device_attribute *attr, char *buf)
> +{
> +	return sprintf(buf, "%d\n", physsockets);
> +}
> +
> +static ssize_t chips_show(struct device *dev, struct device_attribute *attr,
> +			  char *buf)
> +{
> +	return sprintf(buf, "%d\n", physchips);
> +}
> +#endif
> +
>  static struct attribute *device_str_attr_create_(char *name, char *str)
>  {
>  	struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> @@ -1100,6 +1114,10 @@ PAGE_0_ATTR(catalog_len, "%lld\n",
>  		(unsigned long long)be32_to_cpu(page_0->length) * 4096);
>  static BIN_ATTR_RO(catalog, 0/* real length varies */);
>  static DEVICE_ATTR_RO(domains);
> +#ifdef CONFIG_PPC_RTAS
> +static DEVICE_ATTR_RO(sockets);
> +static DEVICE_ATTR_RO(chips);
> +#endif
>  
>  static struct bin_attribute *if_bin_attrs[] = {
>  	&bin_attr_catalog,
> @@ -1110,6 +1128,10 @@ static struct attribute *if_attrs[] = {
>  	&dev_attr_catalog_len.attr,
>  	&dev_attr_catalog_version.attr,
>  	&dev_attr_domains.attr,
> +#ifdef CONFIG_PPC_RTAS
> +	&dev_attr_sockets.attr,
> +	&dev_attr_chips.attr,
> +#endif
>  	NULL,
>  };
>  
> -- 
> 2.18.1