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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 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 BC042C4363C for ; Wed, 7 Oct 2020 07:19:55 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 265592083B for ; Wed, 7 Oct 2020 07:19:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="M/YrKSaF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 265592083B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id AA8FB86A3B; Wed, 7 Oct 2020 07:19:54 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6UYeKV9fLP-V; Wed, 7 Oct 2020 07:19:54 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 0C02886A31; Wed, 7 Oct 2020 07:19:54 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id E33CAC07FF; Wed, 7 Oct 2020 07:19:53 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id C0FA4C0051 for ; Wed, 7 Oct 2020 07:19:51 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id B48A687255 for ; Wed, 7 Oct 2020 07:19:51 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bsJNdJZ3QTU2 for ; Wed, 7 Oct 2020 07:19:49 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by hemlock.osuosl.org (Postfix) with ESMTPS id 25F6287254 for ; Wed, 7 Oct 2020 07:19:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=YdGdKgih2+qKjoFh3CKPOS58AYpOTWzANV+vTx0lHl8=; b=M/YrKSaFtZsJplTBYt4Jhu9rMR sf8rAW6eT2qHAVqAdgF2+7W9G8ho3rFwbyLecv/BHEcb/VRKpTLOhDAyWR8SreqpjiRmHXQgr87Ba 3WGa8rAlKa2mBnKO+gUYWISdn7IEGuRnNWO0oPuUaR97XXVw0J1o5OPa38RX8PjkveffK59WTKAp6 GGrMV+WnHFwfFpAguQsGPalCku/jYXXCwTBkdX4QNWoM9Hu6PipIcY3XN272fSBO6C5zp+hhO2VNS KS/Izsv+zX9DO8hOHph6mgZJ+oKP4fr7D5ZxDGBqdrHxZ23E91OCmCsyw6ape3U0IrTWL4xQVHUhQ I2Odv/ZA==; Received: from dyn-229.woodhou.se ([90.155.92.229] helo=u3832b3a9db3152.infradead.org) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQ3jl-0002y8-9V; Wed, 07 Oct 2020 07:19:45 +0000 Message-ID: <75d79c50d586c18f0b1509423ed673670fc76431.camel@infradead.org> Subject: Re: [PATCH 07/13] irqdomain: Add max_affinity argument to irq_domain_alloc_descs() From: David Woodhouse To: Thomas Gleixner , x86@kernel.org Date: Wed, 07 Oct 2020 08:19:42 +0100 In-Reply-To: <87lfgj59mp.fsf@nanos.tec.linutronix.de> References: <77e64f977f559412f62b467fd062d051ea288f14.camel@infradead.org> <20201005152856.974112-1-dwmw2@infradead.org> <20201005152856.974112-7-dwmw2@infradead.org> <87lfgj59mp.fsf@nanos.tec.linutronix.de> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Cc: Paolo Bonzini , iommu , linux-hyperv@vger.kernel.org, kvm X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============2501244009912789857==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============2501244009912789857== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-fDgAMJE7KcsqM9RJqBeR" --=-fDgAMJE7KcsqM9RJqBeR Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-06 at 23:26 +0200, Thomas Gleixner wrote: > On Mon, Oct 05 2020 at 16:28, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > This is the maximum possible set of CPUs which can be used. Use it > > to calculate the default affinity requested from __irq_alloc_descs() > > by first attempting to find the intersection with irq_default_affinity, > > or falling back to using just the max_affinity if the intersection > > would be empty. >=20 > And why do we need that as yet another argument? >=20 > This is an optional property of the irq domain, really and no caller has > any business with that.=20 Because irq_domain_alloc_descs() doesn't actually *take* the domain as an argument. It's more of an internal function, which is only non- static because it's used from kernel/irq/ipi.c too for some reason. If we convert the IPI code to just call __irq_alloc_descs() directly, perhaps that we can actually make irq_domain_alloc_decs() static. > > int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t= hwirq, > > - int node, const struct irq_affinity_desc *affinity) > > + int node, const struct irq_affinity_desc *affinity, > > + const struct cpumask *max_affinity) > > { > > + cpumask_var_t default_affinity; > > unsigned int hint; > > + int i; > > + > > + /* Check requested per-IRQ affinities are in the possible range */ > > + if (affinity && max_affinity) { > > + for (i =3D 0; i < cnt; i++) > > + if (!cpumask_subset(&affinity[i].mask, max_affinity)) > > + return -EINVAL; >=20 > https://lore.kernel.org/r/alpine.DEB.2.20.1701171956290.3645@nanos >=20 > What is preventing the affinity spreading code from spreading the masks > out to unusable CPUs? The changelog is silent about that part. I'm coming to the conclusion that we should allow unusable CPUs to be specified at this point, just as we do offline CPUs. That's largely driven by the realisation that our x86_non_ir_cpumask is only going to contain online CPUs anyway, and hotplugged CPUs only get added to it as they are brought online. > > + /* > > + * Generate default affinity. Either the possible subset of > > + * irq_default_affinity if such a subset is non-empty, or fall > > + * back to the provided max_affinity if there is no intersection. >=20 > .. > > + * And just a copy of irq_default_affinity in the > > + * !CONFIG_CPUMASK_OFFSTACK case. >=20 > We know that already... >=20 > > + */ > > + memset(&default_affinity, 0, sizeof(default_affinity)); >=20 > Right, memset() before allocating is useful. The memset is because there's no cpumask_var_t initialiser that I can see. So cpumask_available() on the uninitialised 'default_affinity' variable might be true even in the OFFSTACK case. > > + if ((max_affinity && > > + !cpumask_subset(irq_default_affinity, max_affinity))) { > > + if (!alloc_cpumask_var(&default_affinity, GFP_KERNEL)) > > + return -ENOMEM; > > + cpumask_and(default_affinity, max_affinity, > > + irq_default_affinity); > > + if (cpumask_empty(default_affinity)) > > + cpumask_copy(default_affinity, max_affinity); > > + } else if (cpumask_available(default_affinity)) > > + cpumask_copy(default_affinity, irq_default_affinity); >=20 > That's garbage and unreadable. That's why there was a comment explaining it... at which point you claimed to already know :) Clearly the comment didn't do the job it was supposed to do. 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