Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758811AbcJRKDH (ORCPT ); Tue, 18 Oct 2016 06:03:07 -0400 Received: from mga04.intel.com ([192.55.52.120]:61634 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752092AbcJRKC6 (ORCPT ); Tue, 18 Oct 2016 06:02:58 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,361,1473145200"; d="scan'208";a="20739145" 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 v4 0/4] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Date: Tue, 18 Oct 2016 12:02:47 +0200 Message-Id: <1476784971-23872-1-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: 1474 Lines: 40 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 v4: Wrapped the enabling code by CONFIG_X86_64 Add documentation for phir3mwait=disable cmdline switch Move probe_ function call from early_intel_init to intel_init Fixed commit messages Grzegorz Andrejczuk (4): x86/phi: Add R3MWAIT register and bit to msr-info.h x86/phi: Add enabling of the R3MWAIT during boot x86: Use HWCAP2 to expoose Xeon Phi ring 3 MWAIT x86/phi: Add R3MWAIT to CPU features Documentation/kernel-parameters.txt | 5 +++++ 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/hwcap2.h | 7 +++++++ arch/x86/kernel/cpu/common.c | 3 +++ arch/x86/kernel/cpu/intel.c | 40 +++++++++++++++++++++++++++++++++++++ 7 files changed, 71 insertions(+) create mode 100644 arch/x86/include/uapi/asm/hwcap2.h -- 2.5.1