arch/loongarch/kernel/cacheinfo.c

Source file repositories/reference/linux-study-clean/arch/loongarch/kernel/cacheinfo.c

File Facts

System
Linux kernel
Corpus path
arch/loongarch/kernel/cacheinfo.c
Extension
.c
Size
2634 bytes
Lines
93
Domain
Architecture Layer
Bucket
arch/loongarch
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
}

Annotation

Implementation Notes