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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=unavailable 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 262E5C282C2 for ; Wed, 13 Feb 2019 10:51:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE2A5222BA for ; Wed, 13 Feb 2019 10:51:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387957AbfBMKvY (ORCPT ); Wed, 13 Feb 2019 05:51:24 -0500 Received: from mx1.redhat.com ([209.132.183.28]:32918 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732851AbfBMKvY (ORCPT ); Wed, 13 Feb 2019 05:51:24 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C12BB89AF0; Wed, 13 Feb 2019 10:51:23 +0000 (UTC) Received: from localhost (ovpn-8-32.pek2.redhat.com [10.72.8.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id DCA535C1B4; Wed, 13 Feb 2019 10:51:20 +0000 (UTC) From: Ming Lei To: Christoph Hellwig , Bjorn Helgaas , Thomas Gleixner Cc: Jens Axboe , linux-block@vger.kernel.org, Sagi Grimberg , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Keith Busch , Ming Lei Subject: [PATCH V3 5/5] genirq/affinity: Document .calc_sets as required in case of multiple sets Date: Wed, 13 Feb 2019 18:50:41 +0800 Message-Id: <20190213105041.13537-6-ming.lei@redhat.com> In-Reply-To: <20190213105041.13537-1-ming.lei@redhat.com> References: <20190213105041.13537-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 13 Feb 2019 10:51:24 +0000 (UTC) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Now NVMe has implemented the .calc_sets callback for caculating each set's vectors. For other cases of multiple IRQ sets, pre-caculating each set's vectors before allocating IRQ vectors can't work because the whole vectors number is unknow at that time. So document .calc_sets as required explicitly for multiple sets. Acked-by: Bjorn Helgaas Signed-off-by: Ming Lei --- drivers/pci/msi.c | 16 ++++++++++------ include/linux/interrupt.h | 3 ++- 2 files changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 96978459e2a0..199d708b4099 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1036,10 +1036,12 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, return -ERANGE; /* - * If the caller is passing in sets, we can't support a range of - * vectors. The caller needs to handle that. + * If the caller requests multiple sets of IRQs where each set + * requires different affinity, it must also supply a ->calc_sets() + * callback to compute vectors for each set after whole vectors are + * allocated. */ - if (affd && affd->nr_sets && minvec != maxvec) + if (affd && affd->nr_sets > 1 && !affd->calc_sets) return -EINVAL; if (WARN_ON_ONCE(dev->msi_enabled)) @@ -1094,10 +1096,12 @@ static int __pci_enable_msix_range(struct pci_dev *dev, return -ERANGE; /* - * If the caller is passing in sets, we can't support a range of - * supported vectors. The caller needs to handle that. + * If the caller requests multiple sets of IRQs where each set + * requires different affinity, it must also supply a ->calc_sets() + * callback to compute vectors for each set after whole vectors are + * allocated. */ - if (affd && affd->nr_sets && minvec != maxvec) + if (affd && affd->nr_sets > 1 && !affd->calc_sets) return -EINVAL; if (WARN_ON_ONCE(dev->msix_enabled)) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 7a27f6ba1f2f..a053f7fb0ff1 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -269,7 +269,8 @@ struct irq_affinity_notify { * the MSI(-X) vector space * @nr_sets: Length of passed in *sets array * @set_vectors: Number of affinitized sets - * @calc_sets: Callback for caculating set vectors + * @calc_sets: Callback for caculating set vectors, required for + * multiple irq sets. * @priv: Private data of @calc_sets */ struct irq_affinity { -- 2.9.5