From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756657AbaIQT70 (ORCPT ); Wed, 17 Sep 2014 15:59:26 -0400 Received: from g4t3425.houston.hp.com ([15.201.208.53]:38148 "EHLO g4t3425.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756137AbaIQT7Z (ORCPT ); Wed, 17 Sep 2014 15:59:25 -0400 From: Toshi Kani To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com Subject: [PATCH v3 0/5] Support Write-Through mapping on x86 Date: Wed, 17 Sep 2014 13:48:36 -0600 Message-Id: <1410983321-15162-1-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset adds support of Write-Through (WT) mapping on x86. The study below shows that using WT mapping may be useful for non-volatile memory. http://www.hpl.hp.com/techreports/2012/HPL-2012-236.pdf This patchset applies on top of the Juergen's patchset below, which provides the basis of the PAT management. https://lkml.org/lkml/2014/9/12/205 All new/modified interfaces have been tested. v3: - Dropped the set_memory_wt() patch. (Andy Lutomirski) - Refactored the !pat_enabled handling. (H. Peter Anvin, Andy Lutomirski) - Added the picture of PTE encoding. (Konrad Rzeszutek Wilk) v2: - Changed WT to use slot 7 of the PAT MSR. (H. Peter Anvin, Andy Lutomirski) - Changed to have conservative checks to exclude all Pentium 2, 3, M, and 4 families. (Ingo Molnar, Henrique de Moraes Holschuh, Andy Lutomirski) - Updated documentation to cover WT interfaces and usages. (Andy Lutomirski, Yigal Korman) --- Toshi Kani (5): 1/5 x86, mm, pat: Set WT to PA7 slot of PAT MSR 2/5 x86, mm, pat: Change reserve_memtype() to handle WT 3/5 x86, mm, asm-gen: Add ioremap_wt() for WT 4/5 x86, mm, pat: Add pgprot_writethrough() for WT 5/5 x86, mm, pat: Refactor !pat_enable handling --- Documentation/x86/pat.txt | 4 +- arch/x86/include/asm/cacheflush.h | 4 + arch/x86/include/asm/io.h | 2 + arch/x86/include/asm/pgtable_types.h | 3 + arch/x86/mm/init.c | 6 +- arch/x86/mm/iomap_32.c | 18 ++-- arch/x86/mm/ioremap.c | 26 +++++- arch/x86/mm/pageattr.c | 3 - arch/x86/mm/pat.c | 160 ++++++++++++++++++++++------------- include/asm-generic/io.h | 4 + include/asm-generic/iomap.h | 4 + include/asm-generic/pgtable.h | 4 + 12 files changed, 156 insertions(+), 82 deletions(-)