1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/debugfs.h> 4 5 #include <asm/apic.h> 6 #include <asm/processor.h> 7 8 static int cpu_debug_show(struct seq_file *m, void *p) 9 { 10 unsigned long cpu = (unsigned long)m->private; 11 struct cpuinfo_x86 *c = per_cpu_ptr(&cpu_info, cpu); 12 13 seq_printf(m, "online: %d\n", cpu_online(cpu)); 14 if (!c->initialized) 15 return 0; 16 17 seq_printf(m, "initial_apicid: %x\n", c->topo.initial_apicid); 18 seq_printf(m, "apicid: %x\n", c->topo.apicid); 19 seq_printf(m, "pkg_id: %u\n", c->topo.pkg_id); 20 seq_printf(m, "die_id: %u\n", c->topo.die_id); 21 seq_printf(m, "cu_id: %u\n", c->topo.cu_id); 22 seq_printf(m, "core_id: %u\n", c->topo.core_id); 23 seq_printf(m, "logical_pkg_id: %u\n", c->topo.logical_pkg_id); 24 seq_printf(m, "logical_die_id: %u\n", c->topo.logical_die_id); 25 seq_printf(m, "llc_id: %u\n", c->topo.llc_id); 26 seq_printf(m, "l2c_id: %u\n", c->topo.l2c_id); 27 seq_printf(m, "max_cores: %u\n", c->x86_max_cores); 28 seq_printf(m, "max_die_per_pkg: %u\n", __max_die_per_package); 29 seq_printf(m, "smp_num_siblings: %u\n", smp_num_siblings); 30 return 0; 31 } 32 33 static int cpu_debug_open(struct inode *inode, struct file *file) 34 { 35 return single_open(file, cpu_debug_show, inode->i_private); 36 } 37 38 static const struct file_operations dfs_cpu_ops = { 39 .open = cpu_debug_open, 40 .read = seq_read, 41 .llseek = seq_lseek, 42 .release = single_release, 43 }; 44 45 static __init int cpu_init_debugfs(void) 46 { 47 struct dentry *dir, *base = debugfs_create_dir("topo", arch_debugfs_dir); 48 unsigned long id; 49 char name[24]; 50 51 dir = debugfs_create_dir("cpus", base); 52 for_each_possible_cpu(id) { 53 sprintf(name, "%lu", id); 54 debugfs_create_file(name, 0444, dir, (void *)id, &dfs_cpu_ops); 55 } 56 return 0; 57 } 58 late_initcall(cpu_init_debugfs); 59