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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 69AF3C433E7 for ; Thu, 8 Oct 2020 07:54:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08CAC206F4 for ; Thu, 8 Oct 2020 07:54:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ecFJwkfj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728830AbgJHHyq (ORCPT ); Thu, 8 Oct 2020 03:54:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728741AbgJHHyp (ORCPT ); Thu, 8 Oct 2020 03:54:45 -0400 Received: from mail-pl1-x644.google.com (mail-pl1-x644.google.com [IPv6:2607:f8b0:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 957AFC0613D2; Thu, 8 Oct 2020 00:54:44 -0700 (PDT) Received: by mail-pl1-x644.google.com with SMTP id x5so2372554plo.6; Thu, 08 Oct 2020 00:54:44 -0700 (PDT) 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 :in-reply-to:references; bh=j2YZZCvtQrFkPVWDuwpwq7+KzOOQJEvUrhZvKk1fjMk=; b=ecFJwkfjeUhG6Ewb8+CxFWrP9cOyAEta2DZv8zhYOyGy3Q0qE4Mpwd6+BobicUOsmj 1wM+GyB01Xqf0tLzmC7m18rtkgstQQQsXIYh19vScyOTtPfnkzmvkRWBC+8jd5aDeaCx ntfkwO/fJ8k0UwhZOr2kYUmulX96oykExS1XJ8vxkyUtoyRajHf1UFP1Ir1VERT9/l+M ZZ8nNMimh6xTU/vZ6jf8rTfp1fLzzk7rLaVzhzygoThnTRU0vGG2IDednS2eoWuNeSxk XXogKMADQrgX6uSMTpJ7XaAZ81TximYoBC9VePUa2DQ8ZDnThdYUyFXg6eAeniix5U+C T8ow== 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:in-reply-to:references; bh=j2YZZCvtQrFkPVWDuwpwq7+KzOOQJEvUrhZvKk1fjMk=; b=T2RRHhCPtWc5POSNt1ciIPtbjRgwUl2TFFcdq0nSr/vg39BPS6tGYpxUCFx9GH0CwM TbLpL5nP+zd8otyubMXgXnpWSQg8W7lHG+JJuiu/UCQ05cn7vZhTXChgZ9e7WvjDzgGT WCEyoyUZzxwWHT/guI2fRPZi3l/ceFihSpOyJ0HGwKnrWtgDYSu/viz7MR2OZjssiKK4 bHWku/ipJyILyDbvuTKMD5aWF3cz+AFoHwLiUGpJkhWOKnRe6fpyaAf3QqCU4DEDsYat jQkk4j0L5EwScHWpZl8uSS5uSW9nbXJr8s2qkv0Lt7GJGnb10yheYCPW24iSwH9gjuGj jMXg== X-Gm-Message-State: AOAM532wBgxxF3zUvks06qrQWzW3z7Of8wXNOqBzJzH+SAdQ/65t6C0V zNRuUBCgRJ0of02Q33lGado= X-Google-Smtp-Source: ABdhPJzREbTGVLK3lHXufvOTN8YIq/D7sgMqNQp77hhr15+N41wNgFbuZMgu0HCr6gW/c1hx19Y0AQ== X-Received: by 2002:a17:902:8d8f:b029:d0:cc02:8527 with SMTP id v15-20020a1709028d8fb02900d0cc028527mr6504505plo.33.1602143684225; Thu, 08 Oct 2020 00:54:44 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.61]) by smtp.gmail.com with ESMTPSA id k206sm6777106pfd.126.2020.10.08.00.54.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2020 00:54:43 -0700 (PDT) From: yulei.kernel@gmail.com X-Google-Original-From: yuleixzhang@tencent.com To: akpm@linux-foundation.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Chen Zhuo Subject: [PATCH 13/35] mm, dmem: introduce PFN_DMEM and pfn_t_dmem Date: Thu, 8 Oct 2020 15:54:03 +0800 Message-Id: <8c193bcb9cfd7ccce174bc4bbc9c4f5239c1f5ed.1602093760.git.yuleixzhang@tencent.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 2d9148221e9a..c6c0f1f84498 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_ */ -- 2.28.0