arch/x86/kernel/cpu/debugfs.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/debugfs.h>

#include <asm/apic.h>
#include <asm/processor.h>

#include "cpu.h"

static int cpu_debug_show(struct seq_file *m, void *p)
{
	unsigned long cpu = (unsigned long)m->private;
	struct cpuinfo_x86 *c = per_cpu_ptr(&cpu_info, cpu);

	seq_printf(m, "online:              %d\n", cpu_online(cpu));
	if (!c->initialized)
		return 0;

	seq_printf(m, "initial_apicid:      %x\n", c->topo.initial_apicid);
	seq_printf(m, "apicid:              %x\n", c->topo.apicid);
	seq_printf(m, "pkg_id:              %u\n", c->topo.pkg_id);
	seq_printf(m, "die_id:              %u\n", c->topo.die_id);
	seq_printf(m, "cu_id:               %u\n", c->topo.cu_id);
	seq_printf(m, "core_id:             %u\n", c->topo.core_id);
	seq_printf(m, "logical_pkg_id:      %u\n", c->topo.logical_pkg_id);
	seq_printf(m, "logical_die_id:      %u\n", c->topo.logical_die_id);
	seq_printf(m, "llc_id:              %u\n", c->topo.llc_id);
	seq_printf(m, "l2c_id:              %u\n", c->topo.l2c_id);
	seq_printf(m, "amd_node_id:         %u\n", c->topo.amd_node_id);
	seq_printf(m, "amd_nodes_per_pkg:   %u\n", topology_amd_nodes_per_pkg());
	seq_printf(m, "num_threads:         %u\n", __num_threads_per_package);
	seq_printf(m, "num_cores:           %u\n", __num_cores_per_package);
	seq_printf(m, "max_dies_per_pkg:    %u\n", __max_dies_per_package);
	seq_printf(m, "max_threads_per_core:%u\n", __max_threads_per_core);
	return 0;
}

static int cpu_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, cpu_debug_show, inode->i_private);
}

static const struct file_operations dfs_cpu_ops = {
	.open		= cpu_debug_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int dom_debug_show(struct seq_file *m, void *p)
{
	static const char *domain_names[TOPO_MAX_DOMAIN] = {
		[TOPO_SMT_DOMAIN]	= "Thread",
		[TOPO_CORE_DOMAIN]	= "Core",
		[TOPO_MODULE_DOMAIN]	= "Module",
		[TOPO_TILE_DOMAIN]	= "Tile",
		[TOPO_DIE_DOMAIN]	= "Die",
		[TOPO_DIEGRP_DOMAIN]	= "DieGrp",
		[TOPO_PKG_DOMAIN]	= "Package",
	};
	unsigned int dom, nthreads = 1;

	for (dom = 0; dom < TOPO_MAX_DOMAIN; dom++) {
		nthreads *= x86_topo_system.dom_size[dom];
		seq_printf(m, "domain: %-10s shift: %u dom_size: %5u max_threads: %5u\n",
			   domain_names[dom], x86_topo_system.dom_shifts[dom],
			   x86_topo_system.dom_size[dom], nthreads);
	}
	return 0;
}

static int dom_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, dom_debug_show, inode->i_private);
}

static const struct file_operations dfs_dom_ops = {
	.open		= dom_debug_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static __init int cpu_init_debugfs(void)
{
	struct dentry *dir, *base = debugfs_create_dir("topo", arch_debugfs_dir);
	unsigned long id;
	char name[24];

	debugfs_create_file("domains", 0444, base, NULL, &dfs_dom_ops);

	dir = debugfs_create_dir("cpus", base);
	for_each_possible_cpu(id) {
		sprintf(name, "%lu", id);
		debugfs_create_file(name, 0444, dir, (void *)id, &dfs_cpu_ops);
	}
	return 0;
}
late_initcall(cpu_init_debugfs);