Re: [PATCH 1/2][UPDATE] of: base: add support to get the number of cache levels

[Rob Herring]

On Tue, Jan 10, 2017 at 6:00 AM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote:
> It is useful to have helper function just to get the number of cache
> levels for a given logical cpu. This patch adds the support for the
> same.
>
> It will be used on ARM64 platform where the device tree provides the
> information for the additional non-architected/transparent/external
> last level caches that are not integrated with the processors.
>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> ---
>  drivers/of/base.c  | 23 +++++++++++++++++++++++
>  include/linux/of.h |  1 +
>  2 files changed, 24 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index d4bea3c797d6..80e557eca858 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -25,6 +25,7 @@
>  #include <linux/cpu.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/of_graph.h>
>  #include <linux/spinlock.h>
>  #include <linux/slab.h>
> @@ -2268,6 +2269,28 @@ struct device_node *of_find_next_cache_node(const struct device_node *np)
>  }
>
>  /**
> + * of_count_cache_levels - Find the total number of cache levels for the
> + *                        given logical cpu
> + *
> + * @cpu: cpu number(logical index) for which cache levels is being counted
> + *
> + * Returns the total number of cache levels for the given logical cpu
> + */
> +int of_count_cache_levels(unsigned int cpu)
> +{
> +       int level = 0;
> +       struct device_node *np = of_cpu_device_node_get(cpu);
> +
> +       while (np) {
> +               level++;

This will return 1 if you have a cpu node and no cache nodes. Are you
assuming the cpu has a cache?

Perhaps you should just find the last level cache node and then just
read "cache-level".

Rob