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=-8.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,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 C0936C31E46 for ; Wed, 12 Jun 2019 04:34:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9280C20B1F for ; Wed, 12 Jun 2019 04:34:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="WF6XEcrj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729814AbfFLEem (ORCPT ); Wed, 12 Jun 2019 00:34:42 -0400 Received: from mail-pl1-f194.google.com ([209.85.214.194]:38796 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729755AbfFLEel (ORCPT ); Wed, 12 Jun 2019 00:34:41 -0400 Received: by mail-pl1-f194.google.com with SMTP id f97so6074401plb.5 for ; Tue, 11 Jun 2019 21:34:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FXV5Ws8+r5RPo/nKXnoHiLtGYbtFqiKOKRPXyhCi7kk=; b=WF6XEcrjnYm/TJx+cI4M997rrpyH1cFTH/f3AQedIs7pSSTy79gf+vaznSHQIU0Ezg ayYK7Azudp1Y8gy7eeukeYwME2A85H/PSOe3OM5sjWoSvbRQ/iRC3xvytM4I2hRtcL0H 2zFtgHFPl3zJ4Q+z9IKlwaWjBy24AtA4JKSR4= 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=FXV5Ws8+r5RPo/nKXnoHiLtGYbtFqiKOKRPXyhCi7kk=; b=BPxr+ncclYVVcsSLxGHXVLunQiPwgUliyvV8WBu1c4J5ACA8Hxt9fjVHqwYI8ghqsa j9Td2z0eUygvzPOhmoberRNFrF43fB0+Yw1Wff+Txu/x2hkLDd4qj2uZXY1dPDG+RTm/ xm20nAvu3YTYDDT7ROw8zzV5NhR/7vMtde1y5/zlTcGa2G+/d/08Gx4Zu3ad11/FIUk5 BlhrnDjjNMaA/1DgWlWGc5a6tBCybMIEcd8sy1RdhlSCLNpSpZt3b1bdLGXe33ffuSOe TJCbq8M3GyoMKtID9G1xyiJQn0ux9MVyFHE1/Td2NcRXzZhe7fb7SIlo2tb1HL8NJIGL L0+w== X-Gm-Message-State: APjAAAU6rx/q9E17GFo2jt6XepQYpbpIGTnpD/MwvfkayrEMxsVScuJP mcmozfcvcJYm+JP3c4qeC5uQSQ== X-Google-Smtp-Source: APXvYqz0+oRQaQKhKlFNFx2+LDkTLS6Wb5yc/KHLfWZ3BuaHUGMHH37CG2EOx1uhfwpyGdes4XBmEw== X-Received: by 2002:a17:902:b705:: with SMTP id d5mr44143880pls.274.1560314080888; Tue, 11 Jun 2019 21:34:40 -0700 (PDT) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:b852:bd51:9305:4261]) by smtp.gmail.com with ESMTPSA id k8sm15285998pfi.168.2019.06.11.21.34.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 11 Jun 2019 21:34:40 -0700 (PDT) From: Hsin-Yi Wang To: linux-arm-kernel@lists.infradead.org Cc: Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Frank Rowand , Catalin Marinas , Will Deacon , Andrew Morton , Mike Rapoport , Ard Biesheuvel , Miles Chen , Hsin-Yi Wang , James Morse , Andrew Murray , Mark Rutland , Jun Yao , Yu Zhao , Robin Murphy , Laura Abbott , Stephen Boyd , Kees Cook Subject: [PATCH v6 2/3] fdt: add support for rng-seed Date: Wed, 12 Jun 2019 12:33:00 +0800 Message-Id: <20190612043258.166048-3-hsinyi@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190612043258.166048-1-hsinyi@chromium.org> References: <20190612043258.166048-1-hsinyi@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introducing a chosen node, rng-seed, which is an entropy that can be passed to kernel called very early to increase initial device randomness. Bootloader should provide this entropy and the value is read from /chosen/rng-seed in DT. Signed-off-by: Hsin-Yi Wang Reviewed-by: Stephen Boyd --- change log v5->v6: * remove Documentation change --- drivers/of/fdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 3d36b5afd9bd..369130dbd42c 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -24,6 +24,7 @@ #include #include #include +#include #include /* for COMMAND_LINE_SIZE */ #include @@ -1052,6 +1053,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, { int l; const char *p; + const void *rng_seed; pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); @@ -1086,6 +1088,14 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, pr_debug("Command line is: %s\n", (char*)data); + rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l); + if (rng_seed && l > 0) { + add_device_randomness(rng_seed, l); + + /* try to clear seed so it won't be found. */ + fdt_nop_property(initial_boot_params, node, "rng-seed"); + } + /* break now */ return 1; } -- 2.20.1