Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755804AbcJMOpY (ORCPT ); Thu, 13 Oct 2016 10:45:24 -0400 Received: from mga11.intel.com ([192.55.52.93]:22484 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751638AbcJMOpT (ORCPT ); Thu, 13 Oct 2016 10:45:19 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,340,1473145200"; d="scan'208";a="1044202464" From: Grzegorz Andrejczuk To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: bp@suse.de, dave.hansen@linux.intel.com, linux-kernel@vger.kernel.org, lukasz.daniluk@intel.com, james.h.cownie@intel.com, jacob.jun.pan@intel.com, Grzegorz Andrejczuk Subject: [PATCH v3 0/4] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Date: Thu, 13 Oct 2016 16:02:21 +0200 Message-Id: <1476367345-25628-1-git-send-email-grzegorz.andrejczuk@intel.com> X-Mailer: git-send-email 2.5.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1181 Lines: 32 These patches enable Intel Xeon Phi x200 feature to use MONITOR/MWAIT instruction in ring 3 (userspace) Patches set MSR 0x140 for all logical CPUs. Then expose it as CPU feature and introduces elf HWCAP capability for x86. Reference (the solution is temporary MSR definition will be in next SDM document): https://software.intel.com/en-us/blogs/2016/10/06/intel-xeon-phi-product-family-x200-knl-user-mode-ring-3-monitor-and-mwait v2: Check MSR before wrmsrl Shortened names Used Word 3 for feature init_scattered_cpuid_features() Fixed commit messages v3: Included Daves and Thomas comments Grzegorz Andrejczuk (4): Add R3MWAIT register and bit to msr-info.h Add enabling of the R3 MWAIT during boot for KNL Add hwcap2 for x86 Add R3MWAIT to CPU features arch/x86/include/asm/cpufeatures.h | 2 ++ arch/x86/include/asm/elf.h | 9 +++++++++ arch/x86/include/asm/msr-index.h | 5 +++++ arch/x86/include/uapi/asm/hwcap.h | 7 +++++++ arch/x86/kernel/cpu/common.c | 6 ++++++ arch/x86/kernel/cpu/intel.c | 33 +++++++++++++++++++++++++++++++++ 6 files changed, 62 insertions(+) create mode 100644 arch/x86/include/uapi/asm/hwcap.h -- 2.5.1