From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=3.0 tests=DATE_IN_FUTURE_03_06, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61AA8C4321E for ; Fri, 7 Sep 2018 09:24:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 256822087A for ; Fri, 7 Sep 2018 09:24:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 256822087A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728378AbeIGOEz (ORCPT ); Fri, 7 Sep 2018 10:04:55 -0400 Received: from mga03.intel.com ([134.134.136.65]:33040 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728316AbeIGOEz (ORCPT ); Fri, 7 Sep 2018 10:04:55 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Sep 2018 02:24:52 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,341,1531810800"; d="scan'208";a="71100215" Received: from linux.intel.com ([10.54.29.200]) by orsmga007.jf.intel.com with ESMTP; 07 Sep 2018 02:24:52 -0700 Received: from dazhang1-ssd.sh.intel.com (unknown [10.239.48.163]) by linux.intel.com (Postfix) with ESMTP id 780375802B3; Fri, 7 Sep 2018 02:24:49 -0700 (PDT) From: Zhang Yi To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, pbonzini@redhat.com, dan.j.williams@intel.com, dave.jiang@intel.com, yu.c.zhang@intel.com, pagupta@redhat.com, david@redhat.com, jack@suse.cz, hch@lst.de Cc: linux-mm@kvack.org, rkrcmar@redhat.com, jglisse@redhat.com, yi.z.zhang@intel.com, Zhang Yi Subject: [PATCH V5 3/4] mm: add a function to differentiate the pages is from DAX device memory Date: Sat, 8 Sep 2018 02:03:55 +0800 Message-Id: <044309496afbb4121447dff6a453bd6b96d6068d.1536342881.git.yi.z.zhang@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DAX driver hotplug the device memory and move it to memory zone, these pages will be marked reserved flag, however, some other kernel componet will misconceive these pages are reserved mmio (ex: we map these dev_dax or fs_dax pages to kvm for DIMM/NVDIMM backend). Together with the type MEMORY_DEVICE_FS_DAX, we can use is_dax_page() to differentiate the pages is DAX device memory or not. Signed-off-by: Zhang Yi Signed-off-by: Zhang Yu Acked-by: Jan Kara --- include/linux/mm.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 68a5121..de5cbc3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -889,6 +889,13 @@ static inline bool is_device_public_page(const struct page *page) page->pgmap->type == MEMORY_DEVICE_PUBLIC; } +static inline bool is_dax_page(const struct page *page) +{ + return is_zone_device_page(page) && + (page->pgmap->type == MEMORY_DEVICE_FS_DAX || + page->pgmap->type == MEMORY_DEVICE_DEV_DAX); +} + #else /* CONFIG_DEV_PAGEMAP_OPS */ static inline void dev_pagemap_get_ops(void) { @@ -912,6 +919,11 @@ static inline bool is_device_public_page(const struct page *page) { return false; } + +static inline bool is_dax_page(const struct page *page) +{ + return false; +} #endif /* CONFIG_DEV_PAGEMAP_OPS */ static inline void get_page(struct page *page) -- 2.7.4