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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 391F2C0044C for ; Wed, 31 Oct 2018 18:42:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E20742080A for ; Wed, 31 Oct 2018 18:42:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E20742080A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730097AbeKADlr (ORCPT ); Wed, 31 Oct 2018 23:41:47 -0400 Received: from foss.arm.com ([217.140.101.70]:46010 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729785AbeKADlr (ORCPT ); Wed, 31 Oct 2018 23:41:47 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4C50080D; Wed, 31 Oct 2018 11:42:32 -0700 (PDT) Received: from [10.1.196.62] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F2EC03F6A8; Wed, 31 Oct 2018 11:42:29 -0700 (PDT) Subject: Re: [PATCH v2 09/10] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver To: Santosh Shilimkar , Grygorii Strashko , Lokesh Vutla Cc: Nishanth Menon , Santosh Shilimkar , Rob Herring , tglx@linutronix.de, jason@lakedaemon.net, Linux ARM Mailing List , linux-kernel@vger.kernel.org, Tero Kristo , Sekhar Nori , Device Tree Mailing List , Peter Ujfalusi References: <20181018154017.7112-1-lokeshvutla@ti.com> <20181018154017.7112-10-lokeshvutla@ti.com> <9969f24c-cdb0-1f5c-d0f4-b1c1f587325c@ti.com> <86va5ssrfm.wl-marc.zyngier@arm.com> <2369ea50-55db-c97b-5b43-99d572c97dc9@ti.com> <18df8960-9165-ba50-2c25-9f00d32198e8@oracle.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <18df8960-9165-ba50-2c25-9f00d32198e8@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 31/10/18 18:38, Santosh Shilimkar wrote: > On 10/31/2018 11:21 AM, Marc Zyngier wrote: >> Hi Grygorii, >> > > [...] > >> >> Well, I'm convinced that we do not want a networking driver to be tied >> to an interrupt architecture, and that the two should be completely >> independent. But that's my own opinion. I can only see two solutions >> moving forward: >> >> 1) You make the IA a real interrupt controller that exposes real >> interrupts (one per event), and write your networking driver >> independently of the underlying interrupt architecture. >> >> 2) you make the IA an integral part of your network driver, not exposing >> anything outside of it, and limiting the interactions with the IR >> *through the standard IRQ API*. You duplicate this knowledge throughout >> the other client drivers. >> >> I believe that (2) would be a massive design mistake as it locks the >> driver to a single of the HW (and potentially a single revision of the >> firmware) while (1) gives you the required level of flexibility by >> hiding the whole event "concept" at a single location. >> >> Yes, (1) makes you rewrite your existing, out of tree drivers. Oh well... >> > My preference is also not tie the network driver with IA. BTW, this is > very standard functionality with other network drivers too. And this > is handled using MSI-X. > > So strong NO for 1) from me as well. Err. Are you opposing to (1) or (2)? From the above, I cannot really tell... ;-) M. -- Jazz is not dead. It just smells funny...