From patchwork Fri Dec 10 22:19:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12671211 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.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 519A9C433F5 for ; Fri, 10 Dec 2021 22:27:42 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.244434.422972 (Exim 4.92) (envelope-from ) id 1mvoMY-0006IN-Qr; Fri, 10 Dec 2021 22:27:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 244434.422972; Fri, 10 Dec 2021 22:27:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mvoMY-0006I6-Jo; Fri, 10 Dec 2021 22:27:34 +0000 Received: by outflank-mailman (input) for mailman id 244434; Fri, 10 Dec 2021 22:27:33 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mvoEc-0005LK-4p for xen-devel@lists.xenproject.org; Fri, 10 Dec 2021 22:19:22 +0000 Received: from galois.linutronix.de (galois.linutronix.de [2a0a:51c0:0:12e:550::1]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 39411ad0-5a07-11ec-a74f-db008197e53d; Fri, 10 Dec 2021 23:19:21 +0100 (CET) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 39411ad0-5a07-11ec-a74f-db008197e53d Message-ID: <20211210221814.662401116@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1639174761; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=B95vILF4f96+HtIHGYc7a4tJjZ074d989NcBwfF9o/k=; b=fIOwaXb6T7YmYbzCNcuFWouRC2zGGXVRlsUgpqqFOIV0PyrJoOnT+aoyDMVKNK2A6krAZI XSQeEqbaRaAtK4VvrlqFro0SB1vhErnfxWhzQgwr+qsDk36wQ+eFWHO7jp23E3M3puDi35 953o11ODU0TeOVEvTYbYoheZAqmksy26rdvmfI7PBx5P15pbca7UNafWBkDO+hECvHFdj9 Yev9a5GN8EarusWwFqVi4o0AwKm0r+2eGINSSeQt7Q5FKkUK03tvPM0NomazmAYBA/cAga y3ObQUixyXi6+XAFUJSYrz1VSQAlbkSi94tipek580Cs/VN2H2S5HEWAnMSsvw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1639174761; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=B95vILF4f96+HtIHGYc7a4tJjZ074d989NcBwfF9o/k=; b=Te6lNiwtavfKOApR2IhAxEwWLE9W8Bb3G/p8b6YTrFg+8nzwR06UFSXrmPjpS92tCkMg5/ Nkw6+1agFZw6IeBg== From: Thomas Gleixner To: LKML Cc: Bjorn Helgaas , Marc Zygnier , Alex Williamson , Kevin Tian , Jason Gunthorpe , Megha Dey , Ashok Raj , linux-pci@vger.kernel.org, Cedric Le Goater , Greg Kroah-Hartman , Bjorn Helgaas , Juergen Gross , xen-devel@lists.xenproject.org, Arnd Bergmann , Michael Ellerman , Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, Stuart Yoder , Laurentiu Tudor , Nishanth Menon , Tero Kristo , Santosh Shilimkar , linux-arm-kernel@lists.infradead.org, Vinod Koul , dmaengine@vger.kernel.org, Mark Rutland , Will Deacon , Robin Murphy , Joerg Roedel , iommu@lists.linux-foundation.org, Jassi Brar , Peter Ujfalusi , Sinan Kaya Subject: [patch V3 24/35] PCI/MSI: Provide MSI_FLAG_MSIX_CONTIGUOUS References: <20211210221642.869015045@linutronix.de> MIME-Version: 1.0 Date: Fri, 10 Dec 2021 23:19:20 +0100 (CET) From: Thomas Gleixner Provide a domain info flag which makes the core code check for a contiguous MSI-X index on allocation. That's simpler than checking it at some other domain callback in architecture code. Signed-off-by: Thomas Gleixner Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Acked-by: Bjorn Helgaas --- drivers/pci/msi/irqdomain.c | 16 ++++++++++++++-- include/linux/msi.h | 2 ++ 2 files changed, 16 insertions(+), 2 deletions(-) --- a/drivers/pci/msi/irqdomain.c +++ b/drivers/pci/msi/irqdomain.c @@ -89,9 +89,21 @@ static int pci_msi_domain_check_cap(stru if (pci_msi_desc_is_multi_msi(desc) && !(info->flags & MSI_FLAG_MULTI_PCI_MSI)) return 1; - else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX)) - return -ENOTSUPP; + if (desc->pci.msi_attrib.is_msix) { + if (!(info->flags & MSI_FLAG_PCI_MSIX)) + return -ENOTSUPP; + + if (info->flags & MSI_FLAG_MSIX_CONTIGUOUS) { + unsigned int idx = 0; + + /* Check for gaps in the entry indices */ + for_each_msi_entry(desc, dev) { + if (desc->msi_index != idx++) + return -ENOTSUPP; + } + } + } return 0; } --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -361,6 +361,8 @@ enum { MSI_FLAG_LEVEL_CAPABLE = (1 << 6), /* Populate sysfs on alloc() and destroy it on free() */ MSI_FLAG_DEV_SYSFS = (1 << 7), + /* MSI-X entries must be contiguous */ + MSI_FLAG_MSIX_CONTIGUOUS = (1 << 8), }; int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,