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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 1917FC0650F for ; Thu, 8 Aug 2019 17:39:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E38832173C for ; Thu, 8 Aug 2019 17:39:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="hQJcKM4m"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Yh9EIr82" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E38832173C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=pmu3buuCHqQbtCWbfhrG4/FmtuwRJP/L62AdSLdDO5o=; b=hQJcKM4moripFO ER9/K7Jv1HCX5VT19pAyYnhnlPAtpPapFNvQL5CNS2GYnVVi6jspKPmEXV9aCwJ6F2qKjhcaHi48i 0qhjOH931OSPP/cnElFPiBUQlIgpuXf542ASVLuP5hPJohMGDdlm8o9svBnNwLyCB/fhoaaKAKSUp OiWB1RKSaLr9OiXHq5tTluGqRdJVqQlrCQ+msLiMNCam2vQ6WVXt8JcNokG2EKFZAFij76vS7DYpb Jh4EAtNkaE1uHL6Cgz69kwgP4X476/rlxKhKoo0467K3Ck700saRHEzAEGF0X2vrn7x2meLMeAw1H rFZgMSJEJBRLm/ob2a6g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hvmNw-0007bc-Dv; Thu, 08 Aug 2019 17:39:32 +0000 Received: from mail-pf1-x441.google.com ([2607:f8b0:4864:20::441]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hvmNs-0007ZF-UU for linux-arm-kernel@lists.infradead.org; Thu, 08 Aug 2019 17:39:30 +0000 Received: by mail-pf1-x441.google.com with SMTP id r1so44486096pfq.12 for ; Thu, 08 Aug 2019 10:39:27 -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=DFyYlsPKtD2pIkl+6HQ9NsXCJu2oBYedJ0F8UrzQk24=; b=Yh9EIr82yon5IKwUIC8/aoF3FklHeBHZH9PfoCglI1X9pa0gurA07RhtfLxokIKnIz 81xyPWSnwnZLtp5kryW23U9msxajMEa5GnhdM44fHoSwcv0gQJEdVcOJVV7F2TrigyY7 Yl3Mm05/ax1pcApFg4xYKIsnxB9O+sRcfZRQ0= 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=DFyYlsPKtD2pIkl+6HQ9NsXCJu2oBYedJ0F8UrzQk24=; b=EnxCFdYgFL7oVY4SwQm/Y6eD63bgO+PwwWeQZGIEjugGSm2WWCQgCFmNVAJLoYNIsp 1rf/tX9k/Mkl4i1Pc/Z0rSgJYEJPxK/8D+SOuGMtfW7he6B60IfZl+Dfocw+OjuTICm8 l+DBWNzZ/VLU9tiLs8I1oS83eUfObX8TPvaQjdNjMq2DqXcDqVETKViIjRvMjsHsRy6b eQE4RKiSc0t8/c9i9Enjj33qFjwJohvIbKA/yY6rBemngsKiDiVABfjk9XhYDdUQn0BJ 44zEui+b6+M6/VE0tbHkOo1B5yrQ21ecCYo4dNSQizH5Dza+ZaoFqfnsmRD/AwFFv1SZ TUng== X-Gm-Message-State: APjAAAV68BsHwNZremebPYDDGHHRtjXy6a2GNhxmff5A7ZxhjolrGg/3 CDn30E9CGUGQKOcG13P6Nz/SRFuIRUWYDg== X-Google-Smtp-Source: APXvYqyEVq5aKjaC1auKdVBOl3Eitrh/DUCGqDLTS3ddRuXoM7KR+75fidcuNyU2aVJLs620qmfVoQ== X-Received: by 2002:a17:90a:d593:: with SMTP id v19mr5186942pju.1.1565285967016; Thu, 08 Aug 2019 10:39:27 -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 y12sm105824412pfn.187.2019.08.08.10.39.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 08 Aug 2019 10:39:26 -0700 (PDT) From: Hsin-Yi Wang To: linux-arm-kernel@lists.infradead.org Subject: [PATCH RESEND v7 2/3] fdt: add support for rng-seed Date: Fri, 9 Aug 2019 01:38:05 +0800 Message-Id: <20190808173803.1146-3-hsinyi@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190808173803.1146-1-hsinyi@chromium.org> References: <20190808173803.1146-1-hsinyi@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190808_103928_982375_1BC508BA X-CRM114-Status: GOOD ( 14.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Yu Zhao , Kees Cook , Ard Biesheuvel , Catalin Marinas , Stephen Boyd , Will Deacon , linux-kernel@vger.kernel.org, Mike Rapoport , Jun Yao , Miles Chen , Rob Herring , James Morse , Hsin-Yi Wang , Andrew Murray , Andrew Morton , Laura Abbott , Frank Rowand , Robin Murphy Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 Reviewed-by: Rob Herring --- drivers/of/fdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 9cdf14b9aaab..640c817cf65b 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 @@ -1044,6 +1045,7 @@ 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); @@ -1078,6 +1080,14 @@ 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel