arch/x86/kernel/cpu/debugfs.c

   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);