Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752963AbcKGLxV (ORCPT ); Mon, 7 Nov 2016 06:53:21 -0500 Received: from terminus.zytor.com ([198.137.202.10]:47184 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751296AbcKGLxS (ORCPT ); Mon, 7 Nov 2016 06:53:18 -0500 Date: Mon, 7 Nov 2016 03:53:10 -0800 From: tip-bot for Shaohua Li Message-ID: Cc: mingo@kernel.org, shli@fb.com, tglx@linutronix.de, linux-kernel@vger.kernel.org, hpa@zytor.com Reply-To: mingo@kernel.org, shli@fb.com, tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org In-Reply-To: References: To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/cache] x86/intel_rdt: Export the minimum number of set mask bits in sysfs Git-Commit-ID: 53a114a69095eeb0e15d04c2a82358b3192f88df X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1988 Lines: 61 Commit-ID: 53a114a69095eeb0e15d04c2a82358b3192f88df Gitweb: http://git.kernel.org/tip/53a114a69095eeb0e15d04c2a82358b3192f88df Author: Shaohua Li AuthorDate: Thu, 3 Nov 2016 14:09:06 -0700 Committer: Thomas Gleixner CommitDate: Mon, 7 Nov 2016 12:20:52 +0100 x86/intel_rdt: Export the minimum number of set mask bits in sysfs The minimum number of bits set for a cache mask is checked by the kernel when writing a mask, but there is no way for the user to retrieve this information. Add a new file 'min_cbm_bits' to the info directory and export the information to user space. [ tglx: Massaged changelog ] Signed-off-by: Shaohua Li Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Link: http://lkml.kernel.org/r/e69b1ffa206d0353eea58101e1bf9b677d9732f7.1478207143.git.shli@fb.com Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c index e66c7a5..4795880 100644 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -472,6 +472,16 @@ static int rdt_cbm_mask_show(struct kernfs_open_file *of, return 0; } +static int rdt_min_cbm_bits_show(struct kernfs_open_file *of, + struct seq_file *seq, void *v) +{ + struct rdt_resource *r = of->kn->parent->priv; + + seq_printf(seq, "%d\n", r->min_cbm_bits); + + return 0; +} + /* rdtgroup information files for one cache resource. */ static struct rftype res_info_files[] = { { @@ -486,6 +496,12 @@ static struct rftype res_info_files[] = { .kf_ops = &rdtgroup_kf_single_ops, .seq_show = rdt_cbm_mask_show, }, + { + .name = "min_cbm_bits", + .mode = 0444, + .kf_ops = &rdtgroup_kf_single_ops, + .seq_show = rdt_min_cbm_bits_show, + }, }; static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)