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x86/cpu: Provide debug interface

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Provide debug files which dump the topology related information of
cpuinfo_x86. This is useful to validate the upcoming conversion of the
topology evaluation for correctness or bug compatibility.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230814085113.353191313@linutronix.de
This commit is contained in:
Thomas Gleixner 2023-08-14 10:18:47 +02:00
parent 90781f0c4c
commit 48525fd1ea
2 changed files with 60 additions and 0 deletions
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2
arch/x86/kernel/cpu/Makefile
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@ -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 $@ $^

58
arch/x86/kernel/cpu/debugfs.c Normal file
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@ -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);