diff options
| -rw-r--r-- | arch/x86/kernel/cpu/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/debugfs.c | 58 |
2 files changed, 60 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index 4350f6bfc064..93eabf544031 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -54,6 +54,8 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o obj-$(CONFIG_ACRN_GUEST) += acrn.o +obj-$(CONFIG_DEBUG_FS) += debugfs.o + quiet_cmd_mkcapflags = MKCAP $@ cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $@ $^ diff --git a/arch/x86/kernel/cpu/debugfs.c b/arch/x86/kernel/cpu/debugfs.c new file mode 100644 index 000000000000..0c179d684b3b --- /dev/null +++ b/arch/x86/kernel/cpu/debugfs.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/debugfs.h> + +#include <asm/apic.h> +#include <asm/processor.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, "max_cores: %u\n", c->x86_max_cores); + seq_printf(m, "max_die_per_pkg: %u\n", __max_die_per_package); + seq_printf(m, "smp_num_siblings: %u\n", smp_num_siblings); + 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 __init int cpu_init_debugfs(void) +{ + struct dentry *dir, *base = debugfs_create_dir("topo", arch_debugfs_dir); + unsigned long id; + char name[24]; + + 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); |