From patchwork Tue Jul 20 04:42:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 12387533 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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 A3F3BC07E95 for ; Tue, 20 Jul 2021 04:47:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E473610F7 for ; Tue, 20 Jul 2021 04:47:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236395AbhGTEGk (ORCPT ); Tue, 20 Jul 2021 00:06:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:48231 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346412AbhGTEBy (ORCPT ); Tue, 20 Jul 2021 00:01:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626756141; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=fKQJw44KnWWw6kFQEoZm4t5SzBRdmsu+r00ClxkZDTU=; b=bkjI4SRosP9ZyBqbDAqKPvHhDrV2c640m6tPnLkAfdA89KquV92+aMaSLnAPSBVudKcV7d pDBLqndNZVQ8foMAlw6pE3QK9ehiYKAj0gzSW1bLyNd7gKf0DJ3G9fdZgr01SZbRY9a3pD //b1n5fOam+LXAJYSJlC/s/6LXrvFs4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-306-z2E0QqyCN_2Q9H9fHiqZ4A-1; Tue, 20 Jul 2021 00:42:19 -0400 X-MC-Unique: z2E0QqyCN_2Q9H9fHiqZ4A-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ABDBB800050; Tue, 20 Jul 2021 04:42:18 +0000 (UTC) Received: from localhost (ovpn-12-178.pek2.redhat.com [10.72.12.178]) by smtp.corp.redhat.com (Postfix) with ESMTP id 260D860938; Tue, 20 Jul 2021 04:42:13 +0000 (UTC) From: Ming Lei To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org, Ming Lei , Bjorn Helgaas , linux-pci@vger.kernel.org, Christoph Hellwig Subject: [PATCH V2] genirq/affinity: add helper of irq_affinity_calc_sets Date: Tue, 20 Jul 2021 12:42:09 +0800 Message-Id: <20210720044209.851141-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When driver requests to allocate irq affinity managed vectors, pci_alloc_irq_vectors_affinity() may fallback to single vector allocation. In this situation, we don't need to call irq_create_affinity_masks for calling into ->calc_sets() for avoiding potential memory leak, so add the helper for this purpose. Fixes: c66d4bd110a1 ("genirq/affinity: Add new callback for (re)calculating interrupt sets") Reported-by: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: Christoph Hellwig Signed-off-by: Ming Lei Reviewed-by: Christoph Hellwig Acked-by: Bjorn Helgaas --- V2: - move WARN_ON_ONCE() into irq_affinity_calc_sets - don't install default calc_sets() callback as suggested by Christoph drivers/pci/msi.c | 3 ++- include/linux/interrupt.h | 7 +++++++ kernel/irq/affinity.c | 28 +++++++++++++++++----------- 3 files changed, 26 insertions(+), 12 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 9232255c8515..4e6fbdf0741c 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1224,7 +1224,8 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, * for the single interrupt case. */ if (affd) - irq_create_affinity_masks(1, affd); + irq_affinity_calc_sets(1, affd); + pci_intx(dev, 1); return 1; } diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 2ed65b01c961..c7ff84d60465 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -340,6 +340,7 @@ irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd); unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec, const struct irq_affinity *affd); +int irq_affinity_calc_sets(unsigned int affvecs, struct irq_affinity *affd); #else /* CONFIG_SMP */ @@ -391,6 +392,12 @@ irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec, return maxvec; } +static inline int irq_affinity_calc_sets(unsigned int affvecs, + struct irq_affinity *affd) +{ + return 0; +} + #endif /* CONFIG_SMP */ /* diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index 4d89ad4fae3b..addd04d68d42 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -405,6 +405,22 @@ static void default_calc_sets(struct irq_affinity *affd, unsigned int affvecs) affd->set_size[0] = affvecs; } +int irq_affinity_calc_sets(unsigned int affvecs, struct irq_affinity *affd) +{ + /* + * Simple invocations do not provide a calc_sets() callback. Call + * the generic one. + */ + if (!affd->calc_sets) + default_calc_sets(affd, affvecs); + else + affd->calc_sets(affd, affvecs); + + if (WARN_ON_ONCE(affd->nr_sets > IRQ_AFFINITY_MAX_SETS)) + return -ERANGE; + return 0; +} + /** * irq_create_affinity_masks - Create affinity masks for multiqueue spreading * @nvecs: The total number of vectors @@ -429,17 +445,7 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd) else affvecs = 0; - /* - * Simple invocations do not provide a calc_sets() callback. Install - * the generic one. - */ - if (!affd->calc_sets) - affd->calc_sets = default_calc_sets; - - /* Recalculate the sets */ - affd->calc_sets(affd, affvecs); - - if (WARN_ON_ONCE(affd->nr_sets > IRQ_AFFINITY_MAX_SETS)) + if (irq_affinity_calc_sets(affvecs, affd)) return NULL; /* Nothing to assign? */