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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 10F68C432C0 for ; Wed, 27 Nov 2019 20:59:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D99352084B for ; Wed, 27 Nov 2019 20:59:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574888374; bh=hi6mJMVKv1MtVb2EHx6lfLPaOf6PJf+kSEYgHZKgl5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AOfFDglsQXUpZBe8PwB6mmnw/AEBb8P+Z2rhIIVQzTzz4LlOhHwyuvawUAeEtdNPn w0cGXzz0i73ZB4OfXNrBzNZeq9XqoXlEZ1UNpyS+N8xNjTwOm872iVvw7anD9+DBMY 488pBVtvRO3nPeX/tINmUXdns/vbAV+jc2HOVoR0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731439AbfK0U7e (ORCPT ); Wed, 27 Nov 2019 15:59:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:51108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731429AbfK0U7d (ORCPT ); Wed, 27 Nov 2019 15:59:33 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BE4CF20678; Wed, 27 Nov 2019 20:59:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574888373; bh=hi6mJMVKv1MtVb2EHx6lfLPaOf6PJf+kSEYgHZKgl5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rh4x1k3HiBmvQkSOL1hHvS2cBQc1M0pW0catKVxD1Yt/K8jnpvsTQvbEod5KEsp64 pXkBpPxiL7dYJ5zkRUru9olyWAsdwkKqv807tuhu8VGttmj1OcukNKom2T3ZIrzRV+ gpWoIM7nzqBUc9P6xQqIsBP846/uF47/MsN0anb4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aravinda Prasad , Michael Ellerman , Sasha Levin Subject: [PATCH 4.19 110/306] powerpc/pseries: Export raw per-CPU VPA data via debugfs Date: Wed, 27 Nov 2019 21:29:20 +0100 Message-Id: <20191127203123.278063706@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191127203114.766709977@linuxfoundation.org> References: <20191127203114.766709977@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 ea602f7f97ce1..49e3a88b6a0c1 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" @@ -1032,3 +1033,56 @@ 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