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