From nobody Thu Sep 18 18:47:24 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1BEBC4321E for ; Fri, 2 Dec 2022 14:04:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233349AbiLBOED (ORCPT ); Fri, 2 Dec 2022 09:04:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37060 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231776AbiLBOEB (ORCPT ); Fri, 2 Dec 2022 09:04:01 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3599BCCFF0; Fri, 2 Dec 2022 06:04:00 -0800 (PST) Date: Fri, 02 Dec 2022 14:03:57 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1669989838; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v9/VVB6YB4wgZHpv4JxrSHkdVN43DQfG6ar/1FBDzPY=; b=ayIxdckXlrlkUKiQek92NRftJ2jIVde3UnRJl+Pg522qr3Rw35u0mn0YHUJxHBjCHkr0/g szYakWh5ofW43NieOlXNxw4yJu9gaWwG2CYGKgg9mCmUtPaSZMXzMXsRWzlF8inQWUCTN/ i3ZJD3iftxvY25AQDCMUVrx9VqOUDCIrrJfwklinzBV6phvGSEduzUrUGav36RXcbqpUw7 wJ6ZSy8woaLi0MuTfTLKOOsd3CEWt81TFVzQuHXrKXVvrVbWcfThnakJjF+0yW6oYVhq+i pNOWzo3EeOmr0wTWpGs3CSHaAxBtU3w+jGMrJ05sdzmejvRrDhkdF89jjhw5cA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1669989838; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v9/VVB6YB4wgZHpv4JxrSHkdVN43DQfG6ar/1FBDzPY=; b=7CCHGJkvu2uuSpyJRgmyCXEOHi6FQoqWux2FM3sHlmA9UxBgVJxpZv1GTJQEx8PqXTJVOc SG8rNbtlcXzkKdCw== From: "tip-bot2 for Rahul Tanwar" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/apic] x86/of: Add support for boot time interrupt delivery mode configuration Cc: Rahul Tanwar , Thomas Gleixner , Andy Shevchenko , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20221124084143.21841-5-rtanwar@maxlinear.com> References: <20221124084143.21841-5-rtanwar@maxlinear.com> MIME-Version: 1.0 Message-ID: <166998983740.4906.7393408926569297500.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/apic branch of tip: Commit-ID: 2833275568755eb937a52c358bf8bfa7125a463e Gitweb: https://git.kernel.org/tip/2833275568755eb937a52c358bf8bfa71= 25a463e Author: Rahul Tanwar AuthorDate: Thu, 24 Nov 2022 16:41:43 +08:00 Committer: Thomas Gleixner CommitterDate: Fri, 02 Dec 2022 14:57:14 +01:00 x86/of: Add support for boot time interrupt delivery mode configuration Presently, init/boot time interrupt delivery mode is enumerated only for ACPI enabled systems by parsing MADT table or for older systems by parsing MP table. But for OF based x86 systems, it is assumed & hardcoded to be legacy PIC mode. This causes a boot time crash for platforms which do not provide a 8259 compliant legacy PIC. Add support for configuration of init time interrupt delivery mode for x86 OF based systems by introducing a new optional boolean property 'intel,virtual-wire-mode' for the local APIC interrupt-controller node. This property emulates IMCRP Bit 7 of MP feature info byte 2 of MP floating pointer structure. Defaults to legacy PIC mode if absent. Configures it to virtual wire compatibility mode if present. Signed-off-by: Rahul Tanwar Signed-off-by: Thomas Gleixner Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20221124084143.21841-5-rtanwar@maxlinear.com --- arch/x86/kernel/devicetree.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c index 484783f..28da5dd 100644 --- a/arch/x86/kernel/devicetree.c +++ b/arch/x86/kernel/devicetree.c @@ -162,7 +162,14 @@ static void __init dtb_lapic_setup(void) return; } smp_found_config =3D 1; - pic_mode =3D 1; + if (of_property_read_bool(dn, "intel,virtual-wire-mode")) { + pr_info("Virtual Wire compatibility mode.\n"); + pic_mode =3D 0; + } else { + pr_info("IMCR and PIC compatibility mode.\n"); + pic_mode =3D 1; + } + register_lapic_address(lapic_addr); }