From patchwork Sat Feb 17 01:05:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 13561176 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 451ABC48BF5 for ; Sat, 17 Feb 2024 01:06:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yXgEEYPSrg67S4qWlLD5BsZ1fqdcwvwFM/scu2JmS+0=; b=eiQJnYTPlBtzCU 52KezzBZL6hzfDvzm0D6QfNFStg/EVVv8jEjsMazBWmyQWzx8cVsjrNDTiLYq7FpIfQL4insYDgKi IqA+k9XdR7ZhX6xgVSadwDBibXnoZg/tuN1kbYrEFde9eKMSEZEE8hwqaOgCrHvMwqHUdi0gavv3s j00h47Pdz/t86oZMhIXOY6rblghCq0pPGXg+yqArw533xaPYCLNV7klNlBFgHqGV96QYcEYfN5A1V MJqoVSAa1m2CCFMkJO6LvAIhq9Ceb+2uBnSuP48zoQjVusEd3/yzkAZOSkFx3fyUvfsYDzLb7tZZx b9taRFIl0UB6Cq/AbTDw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rb99p-00000004LuI-0WgK; Sat, 17 Feb 2024 01:06:21 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rb99W-00000004Lhg-2RMt; Sat, 17 Feb 2024 01:06:04 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id DA08361E68; Sat, 17 Feb 2024 01:06:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F5C5C433C7; Sat, 17 Feb 2024 01:06:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708131961; bh=cR6lBuTsNe2p1GQlv5k9m41XDe+JPSu/qcoX4YFfeKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OLeOAuh9JcnWjMkP28AX6Wosr7CaT8IJDTe++OAPlHmV45oUdqI2baYVKvuONQLRM REHahxweGolZgJoq4cIcJM609d280RUEZ6QOylnu7b84K0JrmRW4grtFnLrDKr7DHm od2AR/PNbdj2WdEHoiw6v8AipspdwQHYwREzjurg2ModO/udqB4MN4PvqStRsntvhO wln6USBTGOZIWd5lhk/LBgFW7h/6nkbg9ak53wpgvk1GtkpGxA34gf8jlkqNrtppj+ JGioc/KE+Kekqcl6YX6Z2urk1MRDsmJJzTSr56lOvTWTsRk1loY1rrmLedb/9jx56h wnp6VBWh8/MAQ== From: Stephen Boyd To: Rob Herring Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev, linux-um@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org, devicetree@vger.kernel.org, Frank Rowand , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Saurabh Sengar Subject: [PATCH v4 4/7] x86/of: Unconditionally call unflatten_and_copy_device_tree() Date: Fri, 16 Feb 2024 17:05:53 -0800 Message-ID: <20240217010557.2381548-5-sboyd@kernel.org> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog In-Reply-To: <20240217010557.2381548-1-sboyd@kernel.org> References: <20240217010557.2381548-1-sboyd@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240216_170602_748955_5076B400 X-CRM114-Status: GOOD ( 12.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Call this function unconditionally so that we can populate an empty DTB on platforms that don't boot with a firmware provided or builtin DTB. There's no harm in calling unflatten_device_tree() unconditionally here. If there isn't a non-NULL 'initial_boot_params' pointer then unflatten_device_tree() returns early. Cc: Rob Herring Cc: Frank Rowand Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: Cc: "H. Peter Anvin" Tested-by: Saurabh Sengar Signed-off-by: Stephen Boyd --- arch/x86/kernel/devicetree.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c index afd09924094e..650752d112a6 100644 --- a/arch/x86/kernel/devicetree.c +++ b/arch/x86/kernel/devicetree.c @@ -283,22 +283,24 @@ void __init x86_flattree_get_config(void) u32 size, map_len; void *dt; - if (!initial_dtb) - return; + if (initial_dtb) { + map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128); - map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128); + dt = early_memremap(initial_dtb, map_len); + size = fdt_totalsize(dt); + if (map_len < size) { + early_memunmap(dt, map_len); + dt = early_memremap(initial_dtb, size); + map_len = size; + } - dt = early_memremap(initial_dtb, map_len); - size = fdt_totalsize(dt); - if (map_len < size) { - early_memunmap(dt, map_len); - dt = early_memremap(initial_dtb, size); - map_len = size; + early_init_dt_verify(dt); } - early_init_dt_verify(dt); unflatten_and_copy_device_tree(); - early_memunmap(dt, map_len); + + if (initial_dtb) + early_memunmap(dt, map_len); } #endif