Commit 120ad2f7 authored by Rob Herring's avatar Rob Herring Committed by Zeng Heng
Browse files

cacheinfo: Set cache 'id' based on DT data 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/snapshot/v6.7-rc2



---------------------------

Use the minimum CPU h/w id of the CPUs associated with the cache for the
cache 'id'. This will provide a stable id value for a given system. As
we need to check all possible CPUs, we can't use the shared_cpu_map
which is just online CPUs. As there's not a cache to CPUs mapping in DT,
we have to walk all CPU nodes and then walk cache levels.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Signed-off-by: default avatarZeng Heng <zengheng4@huawei.com>
parent 01e2d36d

drivers/base/cacheinfo.c

+26 −0
Original line number Diff line number Diff line
@@ -183,6 +183,31 @@ static bool cache_node_is_unified(struct cacheinfo *this_leaf, 
	return of_property_read_bool(np, "cache-unified");

}



static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)

{

	struct device_node *cpu;

	unsigned long min_id = ~0UL;



	for_each_of_cpu_node(cpu) {

		struct device_node *cache_node = cpu;

		u64 id = of_get_cpu_hwid(cache_node, 0);



		while ((cache_node = of_find_next_cache_node(cache_node))) {

			if ((cache_node == np) && (id < min_id)) {

				min_id = id;

				of_node_put(cache_node);

				break;

			}

			of_node_put(cache_node);

		}

	}



	if (min_id != ~0UL) {

		this_leaf->id = min_id;

		this_leaf->attributes |= CACHE_ID;

	}

}



static void cache_of_set_props(struct cacheinfo *this_leaf,

			       struct device_node *np)

{
@@ -198,6 +223,7 @@ static void cache_of_set_props(struct cacheinfo *this_leaf, 
	cache_get_line_size(this_leaf, np);

	cache_nr_sets(this_leaf, np);

	cache_associativity(this_leaf);

	cache_of_set_id(this_leaf, np);

}



static int cache_setup_of_node(unsigned int cpu)