On Mon, 27 Jan 2025 10:24:13 -0600
Rob Herring <robh@xxxxxxxxxx> wrote:
> On Fri, Jan 24, 2025 at 9:20 AM Alireza Sanaee
> <alireza.sanaee@xxxxxxxxxx> wrote:
> >
> > This commit simply assumes that CPU node entries may point to a
> > cache node that basically act as a l1-cache and there are some CPU
> > nodes without describing any caches but a next-level-cache property
> > that points to l1-cache.
>
> This commit message needs some work. Read documentation on writing
> commit messages.
Hi Rob,
Thanks for the feedback.
I am going to update this text to give more background.
>
> Why/when does describing L1 cache in the cpu nodes not work? That is
> the assumption in the bindings. If we're changing that, there may need
> to be a binding/spec change.
Yes, I will have to send a patch regarding the spec too. Will send a
patch as well.
My plan is to first send a new revision and then send the updates
related to the spec, and then hopefully we can converge there.
Thanks,
Alireza
>
> >
> > Signed-off-by: Alireza Sanaee <alireza.sanaee@xxxxxxxxxx>
> > ---
> > drivers/base/cacheinfo.c | 54
> > +++++++++++++++++++++++++++------------- 1 file changed, 37
> > insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
> > index cf0d455209d7..d119228fc392 100644
> > --- a/drivers/base/cacheinfo.c
> > +++ b/drivers/base/cacheinfo.c
> > @@ -83,7 +83,31 @@ bool last_level_cache_is_shared(unsigned int
> > cpu_x, unsigned int cpu_y)
> >
> > #ifdef CONFIG_OF
> >
> > -static bool of_check_cache_nodes(struct device_node *np);
> > +static bool of_check_cache_node(struct device_node *np) {
> > + if (of_property_present(np, "cache-size") ||
> > + of_property_present(np, "i-cache-size") ||
> > + of_property_present(np, "d-cache-size") ||
> > + of_property_present(np, "cache-unified"))
> > + return true;
> > + return false;
> > +}
> > +
> > +static bool of_check_cache_nodes(struct device_node *np)
> > +{
> > + if (of_property_present(np, "cache-size") ||
> > + of_property_present(np, "i-cache-size") ||
> > + of_property_present(np, "d-cache-size") ||
> > + of_property_present(np, "cache-unified"))
>
> This is the same code as of_check_cache_node(), use it.
>
> > + return true;
> > +
> > + struct device_node *next __free(device_node) =
> > of_find_next_cache_node(np);
> > + if (next) {
> > + return true;
> > + }
> > +
> > + return false;
> > +}
> > +
> >
> > /* OF properties to query for a given cache type */
> > struct cache_type_info {
> > @@ -218,11 +242,23 @@ static int cache_setup_of_node(unsigned int
> > cpu) while (index < cache_leaves(cpu)) {
> > this_leaf = per_cpu_cacheinfo_idx(cpu, index);
> > if (this_leaf->level != 1) {
> > + /* Always go one level down for level > 1 */
> > struct device_node *prev
> > __free(device_node) = np; np = of_find_next_cache_node(np);
> > if (!np)
> > break;
> > + } else {
> > + /* For level 1, check compatibility */
> > + if (!of_device_is_compatible(np, "cache") &&
> > + !of_check_cache_node(np)) {
> > + struct device_node *prev
> > __free(device_node) = np;
> > + np = of_find_next_cache_node(np);
> > + if (!np)
> > + break;
> > + continue; /* Skip to next index
> > without processing */
> > + }
> > }
> > +
> > cache_of_set_props(this_leaf, np);
> > this_leaf->fw_token = np;
> > index++;
> > @@ -234,22 +270,6 @@ static int cache_setup_of_node(unsigned int
> > cpu) return 0;
> > }
> >
> > -static bool of_check_cache_nodes(struct device_node *np)
> > -{
> > - if (of_property_present(np, "cache-size") ||
> > - of_property_present(np, "i-cache-size") ||
> > - of_property_present(np, "d-cache-size") ||
> > - of_property_present(np, "cache-unified"))
> > - return true;
> > -
> > - struct device_node *next __free(device_node) =
> > of_find_next_cache_node(np);
> > - if (next) {
> > - return true;
> > - }
> > -
> > - return false;
> > -}
> > -
> > static int of_count_cache_leaves(struct device_node *np)
> > {
> > unsigned int leaves = 0;
> > --
> > 2.34.1
> >
>
