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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE7EEC4332F for ; Mon, 12 Dec 2022 14:56:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232437AbiLLO4k (ORCPT ); Mon, 12 Dec 2022 09:56:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232032AbiLLO4i (ORCPT ); Mon, 12 Dec 2022 09:56:38 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E56DA337 for ; Mon, 12 Dec 2022 06:56:37 -0800 (PST) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1670856996; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=axrL0CHYZBv6OV84rxaZQdEI1yP5vjjvKefzt9etH+o=; b=IL0dpYsaYtMRMinXPsrWS7QGyLn1i6soNXluG+o6tnbsNgkXMTYeRikn+NSzheApF/3wGT 4iHfWGPTb8fL33JVmBVPq4MTcADBtOxU3EF/EIxJFWUagRePSJFlV+0juTB8C0rWwxTcuS hGzn3ST+oQsTd3eC+TqpltrS03aI2yuIi3hEv/lBDq+zRmfdMT/04hXNLWGbJLwQUCqRUv YD4vFGNZ8GzMkPoOGgXEV7tLuz4Nnuf/0bqLkflCnA0zaT8/yCjU+NcBtKh7/ZoEdWk+C9 CewoL6fT8Oez+ZKq//uiLzdnRQN9Do8plY4WqGv8vOQ4dxogBQNTBREsAFxWbQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1670856996; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=axrL0CHYZBv6OV84rxaZQdEI1yP5vjjvKefzt9etH+o=; b=zMnztmX2KE96vS8QLpTX7kjNdhvbO7m39wNSr34+xFsi79HbrvO45KXVs6atz4mh3lI68L e16IPro0lgvIbhAg== To: John Stoffel Cc: Linus Torvalds , linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: [GIT pull] irq/core for v6.2-rc1 In-Reply-To: References: <167083907785.564878.11381307641454805335.tglx@xen13.tec.linutronix.de> <167083908037.564878.14292182209678650008.tglx@xen13.tec.linutronix.de> Date: Mon, 12 Dec 2022 15:56:36 +0100 Message-ID: <87h6y0brh7.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 12 2022 at 09:07, John Stoffel wrote: >> >> IMS (Interrupt Message Store] is a new specification which allows device >> manufactures to provide implementation defined storage for MSI messages >> contrary to the uniform and specification defined storage mechanisms for > > This sentence reads strangley to me, I'm not quite clear on what > "uniform and specification" really means here. Just a minor nit since > I spent three or four re-reads trying to understand this otherwise > really nicely written history! Yeah, it reads a bit strange. What I wanted to say is: IMS has an implementation defined message store while PCI/MSI[-X] has a specified message store which is uniform accross all devices. That uniformity allowed us to get away with "global" PCI/MSI domains. >> The initial PCI/MSI[-X] support obviously plugged into this model which >> resulted in some basic shared infrastructure in the PCI core code for >> setting up MSI descriptors, which are a pure software construct for holding >> data relevant for a particular MSI interrupt, but the actual association to >> Linux interrupts was completely architecture specific. This model is still >> supported today to keep museum architectures and notorious stranglers > > I think you mean "stragglers" not "stranglers. Though I'm sure you > wanted to strangle things at points! Indeed. Thanks, tglx