Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752509AbaJ0XJo (ORCPT ); Mon, 27 Oct 2014 19:09:44 -0400 Received: from g2t1383g.austin.hp.com ([15.217.136.92]:18755 "EHLO g2t1383g.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751515AbaJ0XJn (ORCPT ); Mon, 27 Oct 2014 19:09:43 -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 v4 0/7] Support Write-Through mapping on x86 Date: Mon, 27 Oct 2014 16:55:38 -0600 Message-Id: <1414450545-14028-1-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.9.3 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/2014/10/27/71 All new/modified interfaces have been tested. v4: - Added set_memory_wt() by adding WT support of regular memory. 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 (7): 1/7 x86, mm, pat: Set WT to PA7 slot of PAT MSR 2/7 x86, mm, pat: Change reserve_memtype() to handle WT 3/7 x86, mm, asm-gen: Add ioremap_wt() for WT 4/7 x86, mm, pat: Add pgprot_writethrough() for WT 5/7 x86, mm, pat: Refactor !pat_enable handling 6/7 x86, mm, asm: Add WT support to set_page_memtype() 7/7 x86, mm: Add set_memory_wt() for WT --- Documentation/x86/pat.txt | 13 ++- arch/x86/include/asm/cacheflush.h | 34 ++++--- 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 | 61 ++++++++++-- arch/x86/mm/pat.c | 174 +++++++++++++++++++++-------------- include/asm-generic/io.h | 4 + include/asm-generic/iomap.h | 4 + include/asm-generic/pgtable.h | 4 + 12 files changed, 233 insertions(+), 116 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/