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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 92A1BC36002 for ; Mon, 24 Mar 2025 07:36:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1twcLa-0005n3-J9; Mon, 24 Mar 2025 03:35:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1twcLY-0005mX-8o; Mon, 24 Mar 2025 03:35:44 -0400 Received: from gandalf.ozlabs.org ([150.107.74.76] helo=mail.ozlabs.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1twcLV-0003Tb-R0; Mon, 24 Mar 2025 03:35:44 -0400 Received: from mail.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4ZLlFv6wp2z4x8X; Mon, 24 Mar 2025 18:35:31 +1100 (AEDT) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.ozlabs.org (Postfix) with ESMTPSA id 4ZLlFs17Scz4wvb; Mon, 24 Mar 2025 18:35:28 +1100 (AEDT) Message-ID: Date: Mon, 24 Mar 2025 08:35:25 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 7/8] ppc/pnv: Add a Power11 Pnv11Chip, and a Power11 Machine To: Aditya Gupta , Mahesh J Salgaonkar , Madhavan Srinivasan , Nicholas Piggin , Harsh Prateek Bora , =?UTF-8?B?RnLDqWTDqXJpYyBCYXJyYXQ=?= Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org References: <20250308205141.3219333-1-adityag@linux.ibm.com> <20250308205141.3219333-8-adityag@linux.ibm.com> <337b1a39-ed5f-4737-a98a-1ed2784aef7b@linux.ibm.com> Content-Language: en-US, fr From: =?UTF-8?Q?C=C3=A9dric_Le_Goater?= Autocrypt: addr=clg@kaod.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=150.107.74.76; envelope-from=SRS0=sfo0=WL=kaod.org=clg@ozlabs.org; helo=mail.ozlabs.org X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.062, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 3/24/25 08:13, Aditya Gupta wrote: > Hi Cedric, > > On 09/03/25 19:38, Cédric Le Goater wrote: >> On 3/8/25 21:51, Aditya Gupta wrote: >>> <...snip...> >>> >>>   static void pnv_chip_power8_instance_init(Object *obj) >>>   { >>>       Pnv8Chip *chip8 = PNV8_CHIP(obj); >>> @@ -1966,6 +1996,20 @@ static void pnv_chip_power10_instance_init(Object *obj) >>>       PnvChipClass *pcc = PNV_CHIP_GET_CLASS(obj); >>>       int i; >>>   +    /* >>> +     * Power11 declares Power10 as it's parent class, to be able to reuse >>> +     * most of the Power10 code. >>> +     * But this causes Power10 and Power11's both instance init to be >>> +     * called for PowerNV11 chip >>> +     * >>> +     * Skip initialising Power10 specific child objects, if the chip is >>> +     * Power11 chip, in which case power11's instance init will initialise >>> +     * the child objects >>> +     */ >>> +    if (!strcmp(object_get_typename(obj), TYPE_PNV_CHIP_POWER11)) { >>> +        return; >>> +    } >>> + >> >> This is a hack !  Please duplicate the code like done for other chips. >> >> >>> <...snip...> >>> >>>   +    /* >>> +     * P11 chip and variants >>> +     */ >>> +    { >>> +        .name          = TYPE_PNV11_CHIP, >>> +        .parent        = TYPE_PNV10_CHIP, >> >> why is the parent not TYPE_PNV_CHIP like the other chips ? >> >> This is a hack which can be easily avoided with more work :) > > > When I do this, every function using Pnv10Chip* will need to be duplicated to use Pnv11Chip*. > > I will do that. > > But what do you say about changing Pnv10 chip to Pnv1x chip ? It may only be used by Pnv10 and Pnv11, not future chips. But is that unnecessary for just two versions of the chip ? > > Just tried to think of some ways to reduce duplication, or having different files such as pnv10.c, pnv11.c ? I am not sure because these might be unnecessary things too. Please open code (and duplicate) first. Then we will see how we can make things common. Checking the typename in the instance_init handleris a hack not for upstream. Thanks, C.