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// SPDX-License-Identifier: GPL-2.0-only
/*
* LoongArch cacheinfo support
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/cacheinfo.h>
#include <linux/topology.h>
#include <asm/bootinfo.h>
#include <asm/cpu-info.h>
int init_cache_level(unsigned int cpu)
{
int cache_present = current_cpu_data.cache_leaves_present;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
this_cpu_ci->num_levels =
current_cpu_data.cache_leaves[cache_present - 1].level;
this_cpu_ci->num_leaves = cache_present;
return 0;
}
static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
struct cacheinfo *sib_leaf)
{
return (!(*(unsigned char *)(this_leaf->priv) & CACHE_PRIVATE)
&& !(*(unsigned char *)(sib_leaf->priv) & CACHE_PRIVATE));
}
static void cache_cpumap_setup(unsigned int cpu)
{
unsigned int index;
struct cacheinfo *this_leaf, *sib_leaf;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
for (index = 0; index < this_cpu_ci->num_leaves; index++) {
unsigned int i;
this_leaf = this_cpu_ci->info_list + index;
/* skip if shared_cpu_map is already populated */
if (!cpumask_empty(&this_leaf->shared_cpu_map))
continue;
cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
for_each_online_cpu(i) {
struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
if (i == cpu || !sib_cpu_ci->info_list ||
(cpu_to_node(i) != cpu_to_node(cpu)))
continue;
sib_leaf = sib_cpu_ci->info_list + index;
if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
}
}
}
}
int populate_cache_leaves(unsigned int cpu)
{
int i, cache_present = current_cpu_data.cache_leaves_present;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
struct cacheinfo *this_leaf = this_cpu_ci->info_list;
struct cache_desc *cd, *cdesc = current_cpu_data.cache_leaves;
for (i = 0; i < cache_present; i++) {
cd = cdesc + i;
this_leaf->type = cd->type;
this_leaf->level = cd->level;
this_leaf->coherency_line_size = cd->linesz;
this_leaf->number_of_sets = cd->sets;
this_leaf->ways_of_associativity = cd->ways;
this_leaf->size = cd->linesz * cd->sets * cd->ways;
this_leaf->priv = &cd->flags;
this_leaf++;
}
cache_cpumap_setup(cpu);
this_cpu_ci->cpu_map_populated = true;
return 0;
}
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