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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293// 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; /* SMT cores share all caches */ if (cpus_are_siblings(i, cpu)) { cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map); cpumask_set_cpu(i, &this_leaf->shared_cpu_map); } /* Node's cores share shared caches */ 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;}