From patchwork Mon Dec 6 22:39:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12660061 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6BEDC433FE for ; Mon, 6 Dec 2021 22:41:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376763AbhLFWoe (ORCPT ); Mon, 6 Dec 2021 17:44:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359746AbhLFWnx (ORCPT ); Mon, 6 Dec 2021 17:43:53 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60A75C061A83; Mon, 6 Dec 2021 14:39:38 -0800 (PST) Message-ID: <20211206210439.021277807@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1638830376; 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=OQ0f5KjFgbSgmAVP4hnPtoqFO6q3+Ey9wT8c/Y+fgX8=; b=qT4xZpBBQ0W0WAPiWf1zJJDYqrWw+ae2Lg455lzO/6P3dumvTkmmO4OyNNpV7Ehjg/w2fl manHJleIsU6+wlUO34qbZ1k6P6+fjxe8BUkOz6OIEK3o0dKzrtvUgPypQwoUUUNIuZDXWM jnT7oY4poA/FbJovF4S/oz4eehalct4S0HCuDJJLpJBmvaR5HibVjBTc7GIHDoqZivOfX3 iNd/9PdHT8ILfKUVyXiifKPtOz1VtZWGnO4Nr1SM+0tOgRkRXdJgokjEVSeB/BR9gvjNQB gsA5BgMNnlWPVbKtzFcSx9515yBP8sGdsrFziNqK9jyPrTDomPQd0ggxKPGeng== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1638830376; 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=OQ0f5KjFgbSgmAVP4hnPtoqFO6q3+Ey9wT8c/Y+fgX8=; b=pP/dPC6PWwsNwzwAXjslgxnuRXxlApMSk05YyUr2uPuStX/4iB4GmcP+0fnXmnf907i7Do 3vW65Ey/2ZjD8lDQ== 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 , xen-devel@lists.xenproject.org, Juergen Gross , Greg Kroah-Hartman , Will Deacon , Santosh Shilimkar , iommu@lists.linux-foundation.org, dmaengine@vger.kernel.org, Stuart Yoder , Laurentiu Tudor , Nishanth Menon , Tero Kristo , linux-arm-kernel@lists.infradead.org, Vinod Koul , Mark Rutland , Robin Murphy , Sinan Kaya Subject: [patch V2 25/36] PCI/MSI: Provide MSI_FLAG_MSIX_CONTIGUOUS References: <20211206210307.625116253@linutronix.de> MIME-Version: 1.0 Date: Mon, 6 Dec 2021 23:39:36 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org 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 @@ -376,6 +376,8 @@ 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,