From patchwork Mon Dec 7 11:31:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: yulei zhang X-Patchwork-Id: 11955343 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 B5CAAC2BBCA for ; Mon, 7 Dec 2020 11:35:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B26523340 for ; Mon, 7 Dec 2020 11:35:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727016AbgLGLej (ORCPT ); Mon, 7 Dec 2020 06:34:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40798 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726992AbgLGLei (ORCPT ); Mon, 7 Dec 2020 06:34:38 -0500 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A422C0613D3; Mon, 7 Dec 2020 03:34:23 -0800 (PST) Received: by mail-pf1-x435.google.com with SMTP id w6so9617930pfu.1; Mon, 07 Dec 2020 03:34:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=JTgCCtK3neklBBZP7ALPG1Lf4m1ypdSzhK8xGX8aX9M=; b=SMiGuwjR9VTZexC3BrV+8B6agmZASS9JEaHnUZ2E1SWgJbsxMfQOcftyniDMaI4UtS HqH6yx1ijBUM+P9SqB+YEbgYrBhqCjmLdV5Rg7vXsyZ5jaSaXRaZJmc3Yjxq+eEZG4oV nX66/M0q5EhEDZF9/LBmyncihaCPD6I2LGmGewQmo7Ga9FfsB0ouuSEkUUjD6lxI+caB D6bY535ziVmj3fxBixW3OY+kJ46tqvHPAMERQCF66rPJh2efyUOOl5tjzf+zzNRblBCI Xb2Fj9L2Eaf0AdeetZGtjqVgVV4QkTfvH80QfKPg+23LmZ8AusMLBfv6lkdZ/XnKYpIr aHeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=JTgCCtK3neklBBZP7ALPG1Lf4m1ypdSzhK8xGX8aX9M=; b=lQMXEqI8Az+Vd4vTC4KROMF4iGJIBVQRJTu7cT9MT0YYypNifIfwU4LP609D+R/sOy fGZrZgXi8tPepprVItAhxnLOeeopak52JUkIOls8Ue29hH2vHbmbjhn/8RF3fRHTIi2X 7hYKZ967Q1v0aRkVd8/Gp/n0DUxQ9oeD0kmi0uhHVplAmaOfMm14D29lhoqi2OreA14g 1hyfGSUCERWGjxRFM1lLWLUyUJNdBdNOdQJZNv4O5Fv9U5L2Rbsr+MskxfFR/kVwHaHL L/YcqwJoYCllOb+GYVtZinQNUo/OvAerkW2p71Pl88Vsmbtn+NyI5PmVSAw9Pii6JIV6 VC2A== X-Gm-Message-State: AOAM530j2SaSL8r9Kb9DfFwvzw7MDJ5NcncJYvZHcChb5yWvAskcMEYZ /ggmBAv56tP5FPFvhFIdQyI= X-Google-Smtp-Source: ABdhPJzkG6zV67FqF8oje1zqM80ZaXke6YmOfj+FEi4/qDBrNc9iaM3WstHda8DEvRc0vm268vDR+g== X-Received: by 2002:a63:445c:: with SMTP id t28mr17760750pgk.373.1607340862967; Mon, 07 Dec 2020 03:34:22 -0800 (PST) Received: from localhost.localdomain ([203.205.141.39]) by smtp.gmail.com with ESMTPSA id d4sm14219822pfo.127.2020.12.07.03.34.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Dec 2020 03:34:22 -0800 (PST) From: yulei.kernel@gmail.com X-Google-Original-From: yuleixzhang@tencent.com To: linux-mm@kvack.org, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: joao.m.martins@oracle.com, rdunlap@infradead.org, sean.j.christopherson@intel.com, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Chen Zhuo Subject: [RFC V2 13/37] mm, dmem: introduce PFN_DMEM and pfn_t_dmem Date: Mon, 7 Dec 2020 19:31:06 +0800 Message-Id: X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Yulei Zhang Introduce PFN_DMEM as a new pfn flag for dmem pfn, define it by setting (BITS_PER_LONG_LONG - 6) bit. Introduce pfn_t_dmem() helper to recognize dmem pfn. Signed-off-by: Chen Zhuo Signed-off-by: Yulei Zhang --- include/linux/pfn_t.h | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index 2d91482..c6c0f1f 100644 --- a/include/linux/pfn_t.h +++ b/include/linux/pfn_t.h @@ -11,6 +11,7 @@ * PFN_MAP - pfn has a dynamic page mapping established by a device driver * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not * get_user_pages + * PFN_DMEM - pfn references a dmem page */ #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) @@ -18,13 +19,15 @@ #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) #define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5)) +#define PFN_DMEM (1ULL << (BITS_PER_LONG_LONG - 6)) #define PFN_FLAGS_TRACE \ { PFN_SPECIAL, "SPECIAL" }, \ { PFN_SG_CHAIN, "SG_CHAIN" }, \ { PFN_SG_LAST, "SG_LAST" }, \ { PFN_DEV, "DEV" }, \ - { PFN_MAP, "MAP" } + { PFN_MAP, "MAP" }, \ + { PFN_DMEM, "DMEM" } static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) { @@ -128,4 +131,16 @@ static inline bool pfn_t_special(pfn_t pfn) return false; } #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ + +#ifdef CONFIG_ARCH_HAS_PTE_DMEM +static inline bool pfn_t_dmem(pfn_t pfn) +{ + return (pfn.val & PFN_DMEM) == PFN_DMEM; +} +#else +static inline bool pfn_t_dmem(pfn_t pfn) +{ + return false; +} +#endif /* CONFIG_ARCH_HAS_PTE_DMEM */ #endif /* _LINUX_PFN_T_H_ */