From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 015DAC432C3 for ; Sat, 16 Nov 2019 16:11:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA0ED20874 for ; Sat, 16 Nov 2019 16:11:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573920692; bh=4BQXjHM/0DWtFo2HhpXrBkKVLPTEKmgwg598UQ4Nidk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VRuF/v65Ab9Xy+qClaaDRISrWmBmj06038vhx6V+9vMzeNNg8OeiTqtW/rwH2RAy7 yvxOsAtHCn7GxJdDOGu5BSd5l5oTXnNVI03vDPngVLlHIJHWurMpEEO8SOBiFCwb0Z Sw4jveycBOvoidANrMX9MWFa1ijhgwnbiH6PkPuo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731810AbfKPQLb (ORCPT ); Sat, 16 Nov 2019 11:11:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:55846 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729967AbfKPPsi (ORCPT ); Sat, 16 Nov 2019 10:48:38 -0500 Received: from sasha-vm.mshome.net (unknown [50.234.116.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 024102086A; Sat, 16 Nov 2019 15:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573919318; bh=4BQXjHM/0DWtFo2HhpXrBkKVLPTEKmgwg598UQ4Nidk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wShjuPUHB01VPK0OSvz8C4MiGDnL2IuvG8n9ZTYKY3s/dhZ6n48Uuta4LOKtfngf0 QIYp4pzF9fYm8lusxUoiO7Oo97em/Q3G+KN8bEIifz1Slgz7PsZqyWeDXfme5gw99c qOF/8+mWo2x3yIbEC9MUc0yfCIlhRt554tPz2iE8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Aravinda Prasad , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.14 059/150] powerpc/pseries: Export raw per-CPU VPA data via debugfs Date: Sat, 16 Nov 2019 10:45:57 -0500 Message-Id: <20191116154729.9573-59-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191116154729.9573-1-sashal@kernel.org> References: <20191116154729.9573-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Aravinda Prasad [ Upstream commit c6c26fb55e8e4b3fc376be5611685990a17de27a ] This patch exports the raw per-CPU VPA data via debugfs. A per-CPU file is created which exports the VPA data of that CPU to help debug some of the VPA related issues or to analyze the per-CPU VPA related statistics. v3: Removed offline CPU check. v2: Included offline CPU check and other review comments. Signed-off-by: Aravinda Prasad Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/platforms/pseries/lpar.c | 54 +++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index eb738ef577926..c0ae3847b8db5 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -48,6 +48,7 @@ #include #include #include +#include #include "pseries.h" @@ -1036,3 +1037,56 @@ static int __init reserve_vrma_context_id(void) return 0; } machine_device_initcall(pseries, reserve_vrma_context_id); + +#ifdef CONFIG_DEBUG_FS +/* debugfs file interface for vpa data */ +static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, + loff_t *pos) +{ + int cpu = (long)filp->private_data; + struct lppaca *lppaca = &lppaca_of(cpu); + + return simple_read_from_buffer(buf, len, pos, lppaca, + sizeof(struct lppaca)); +} + +static const struct file_operations vpa_fops = { + .open = simple_open, + .read = vpa_file_read, + .llseek = default_llseek, +}; + +static int __init vpa_debugfs_init(void) +{ + char name[16]; + long i; + static struct dentry *vpa_dir; + + if (!firmware_has_feature(FW_FEATURE_SPLPAR)) + return 0; + + vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root); + if (!vpa_dir) { + pr_warn("%s: can't create vpa root dir\n", __func__); + return -ENOMEM; + } + + /* set up the per-cpu vpa file*/ + for_each_possible_cpu(i) { + struct dentry *d; + + sprintf(name, "cpu-%ld", i); + + d = debugfs_create_file(name, 0400, vpa_dir, (void *)i, + &vpa_fops); + if (!d) { + pr_warn("%s: can't create per-cpu vpa file\n", + __func__); + return -ENOMEM; + } + } + + return 0; +} +machine_arch_initcall(pseries, vpa_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ -- 2.20.1