From patchwork Fri Jul 28 12:13:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13331840 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 47CD9C001DE for ; Fri, 28 Jul 2023 12:13:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235989AbjG1MNk (ORCPT ); Fri, 28 Jul 2023 08:13:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236275AbjG1MNa (ORCPT ); Fri, 28 Jul 2023 08:13:30 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8B173C38; Fri, 28 Jul 2023 05:13:07 -0700 (PDT) Message-ID: <20230728120930.727298737@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1690546386; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=FytBYElyGEIkDLoNOYBMDUbfYGktH+yBC5OWWqC5tQQ=; b=hZ41luBM+cti3euUpMK4zrf7WtFnCgKHLtyziGAZkLcWHfkkOK1fLCTSc8+omhqrlivgwL 3xQ44xGTq6miYIs6Xd5UTTbDgV+NK/IT8fgk84D8Dl8fbIwlG8EGuOH48Kl8IQagMdDQlg kF+F7o482+zX2yF0GFjALI+UAwm55CcdfgSYjb1+rr9n0ZZfViaAZLB3XPGSYgtOs9saz+ kSsA+/X2BeExBUcJDxro5VX/BlQmukaMrVIIzcRp8MmPshfm8Znxmxg/Mcx7Ahz6m+x1vo R0wEwVHpVMRqRZgxLfraY2whEviOuMJjdnnAWi9LmBVordDd+T5s6agMaGSLWg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1690546386; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=FytBYElyGEIkDLoNOYBMDUbfYGktH+yBC5OWWqC5tQQ=; b=dzTdqmDzRwOd4rwCfjlNdB7I/QXFPa+mOtg/PmnlywJ665y6b6j0aC+/R8q1fb1PfVO/rE Fjt9pzUzUtdK6vBQ== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Tom Lendacky , Andrew Cooper , Arjan van de Ven , "James E.J. Bottomley" , Dick Kennedy , James Smart , "Martin K. Petersen" , linux-scsi@vger.kernel.org, Guenter Roeck , linux-hwmon@vger.kernel.org, Jean Delvare , Huang Rui , Juergen Gross , Steve Wahl , Mike Travis , Dimitri Sivanich , Russ Anderson Subject: [patch v2 19/38] x86/cpu: Provide debug interface References: <20230728105650.565799744@linutronix.de> MIME-Version: 1.0 Date: Fri, 28 Jul 2023 14:13:06 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org 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 --- V2: Don't return ENODEV when offline and make online a field. --- arch/x86/kernel/cpu/Makefile | 2 + arch/x86/kernel/cpu/debugfs.c | 58 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -54,6 +54,8 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr obj-$(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 $@ $^ --- /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 = (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 [10]; + + 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);