From nobody Wed Dec 17 07:59:08 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81426CDB47E for ; Fri, 13 Oct 2023 09:38:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231203AbjJMJiK (ORCPT ); Fri, 13 Oct 2023 05:38:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230510AbjJMJiH (ORCPT ); Fri, 13 Oct 2023 05:38:07 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C0A2B7; Fri, 13 Oct 2023 02:38:04 -0700 (PDT) Date: Fri, 13 Oct 2023 09:38:02 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1697189883; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=U2BAOWoNEDTVIWwE7C+fvkNZ7nxqswUT9TQVN6SmJak=; b=A0dJ6jX1wy7xxolGmNlIRgIHdlIEZjuztrSoym46x8RcWopQwR/lZKo5PN0raQThn2W5rJ ibGNC0jxxs1kbMTQvTOoyK3GRy3uU8G48oR4fynb9YXTeg9lxBxDJ+IjiYLM8r14gF6vGU aeV2H4noUaXHNfkWgOjmCh9myteQ95RfAcq4bQgpXvpxMxccWmEPze1ANM9h0yuFhuE/s1 KetpR4l+MZ76Fx6wQ0jAjCusOmK08w6Aj3UGzCfLCiZOAK4PWN4kO0Ab0Jdju89z8dIxPM S/yLuHQXPhvxY7OX2g1O/qsApfhmTj/jZsfBiVEFR0upKsVwTXkyLkgW2490xA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1697189883; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=U2BAOWoNEDTVIWwE7C+fvkNZ7nxqswUT9TQVN6SmJak=; b=xlcmw/R4C5DImpgd2nTach9Q6U8BglrfCDE9+J7l20T0VPX3MmnT7ioWc9iAACgZYomhs7 QpKBbhN6a6mTbNCg== From: "tip-bot2 for Thomas Gleixner" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/core] x86/cpu: Provide debug interface Cc: Thomas Gleixner , Juergen Gross , Sohil Mehta , Michael Kelley , "Peter Zijlstra (Intel)" , Zhang Rui , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20230814085113.353191313@linutronix.de> References: <20230814085113.353191313@linutronix.de> MIME-Version: 1.0 Message-ID: <169718988245.3135.226367801293113279.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/core branch of tip: Commit-ID: 48525fd1ea1cfa059a580e77b10ea8790914efa2 Gitweb: https://git.kernel.org/tip/48525fd1ea1cfa059a580e77b10ea8790= 914efa2 Author: Thomas Gleixner AuthorDate: Mon, 14 Aug 2023 10:18:47 +02:00 Committer: Thomas Gleixner CommitterDate: Tue, 10 Oct 2023 14:38:19 +02:00 x86/cpu: Provide debug interface 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 Tested-by: Juergen Gross Tested-by: Sohil Mehta Tested-by: Michael Kelley Tested-by: Peter Zijlstra (Intel) Tested-by: Zhang Rui Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20230814085113.353191313@linutronix.de --- arch/x86/kernel/cpu/Makefile | 2 +- arch/x86/kernel/cpu/debugfs.c | 58 ++++++++++++++++++++++++++++++++++- 2 files changed, 60 insertions(+) create mode 100644 arch/x86/kernel/cpu/debugfs.c diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index 4350f6b..93eabf5 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -54,6 +54,8 @@ obj-$(CONFIG_X86_LOCAL_APIC) +=3D perfctr-watchdog.o obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o obj-$(CONFIG_ACRN_GUEST) +=3D acrn.o =20 +obj-$(CONFIG_DEBUG_FS) +=3D debugfs.o + quiet_cmd_mkcapflags =3D MKCAP $@ cmd_mkcapflags =3D $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $= @ $^ =20 diff --git a/arch/x86/kernel/cpu/debugfs.c b/arch/x86/kernel/cpu/debugfs.c new file mode 100644 index 0000000..0c179d6 --- /dev/null +++ b/arch/x86/kernel/cpu/debugfs.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +#include +#include + +static int cpu_debug_show(struct seq_file *m, void *p) +{ + unsigned long cpu =3D (unsigned long)m->private; + struct cpuinfo_x86 *c =3D 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 =3D { + .open =3D cpu_debug_open, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D single_release, +}; + +static __init int cpu_init_debugfs(void) +{ + struct dentry *dir, *base =3D debugfs_create_dir("topo", arch_debugfs_dir= ); + unsigned long id; + char name[24]; + + dir =3D 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);