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=-5.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 A6D20C4338F for ; Mon, 26 Jul 2021 21:14:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90AB860F5A for ; Mon, 26 Jul 2021 21:14:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233431AbhGZUdq (ORCPT ); Mon, 26 Jul 2021 16:33:46 -0400 Received: from foss.arm.com ([217.140.110.172]:59196 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232922AbhGZUdn (ORCPT ); Mon, 26 Jul 2021 16:33:43 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A693631B; Mon, 26 Jul 2021 14:14:11 -0700 (PDT) Received: from [10.57.36.146] (unknown [10.57.36.146]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 930203F70D; Mon, 26 Jul 2021 14:14:10 -0700 (PDT) Subject: Re: [PATCH v5] arm pl011 serial: support multi-irq request To: Qian Cai , Bing Fan , gregkh@linuxfoundation.org, Bing Fan Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Linux ARM References: <1625103512-30182-1-git-send-email-hptsfb@gmail.com> <60f007b3-bb01-dd0a-b1a2-a6da62a486e5@quicinc.com> <3b60d054-4e22-62fa-c31b-29b146495a65@gmail.com> <7535ae2f-6a12-8203-0498-8ac85ab0d9a7@arm.com> <290c01ec-173f-755f-788e-2a33a69586e8@quicinc.com> From: Robin Murphy Message-ID: Date: Mon, 26 Jul 2021 22:14:04 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <290c01ec-173f-755f-788e-2a33a69586e8@quicinc.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-07-26 21:56, Qian Cai wrote: > > > On 7/26/2021 4:36 PM, Robin Murphy wrote: >> The important point you're missing, but which the KASAN dump does hint at, is >> that that is a machine with SBSA generic UARTs booting via ACPI - I know it >> doesn't do DT at all because I have one too. What matters there is that pl011 >> binds as a platform driver, *not* an amba driver. > > Thanks for pointing out, Robin. I just yet to see an ARM server booting from DT > those days. Unlikely in production datacentre/cloud environments, indeed, although some of the mid-range kit like LX2160 does start to blur the line of what might be considered "server", and that's one example which *does* have full-featured DT support (even if it also aspires to ACPI...) What I thought was worth clarifying for the general audience is that the relevant aspects of "server" here should in fact still be possible to reproduce on something like a Raspberry Pi or a tiny QEMU VM, if one can figure out the ACPI runes :) Thanks, Robin.