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 Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 87570C4332F for ; Mon, 6 Dec 2021 22:39:46 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 4A2A041C65; Mon, 6 Dec 2021 22:39:46 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NPUTdVT_j0H6; Mon, 6 Dec 2021 22:39:45 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id 18E62408EC; Mon, 6 Dec 2021 22:39:45 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 53E19C0074; Mon, 6 Dec 2021 22:39:44 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 16EEFC0012 for ; Mon, 6 Dec 2021 22:39:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id AAF8840523 for ; Mon, 6 Dec 2021 22:39:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=linutronix.de header.b="abvHkvl7"; dkim=neutral reason="invalid (unsupported algorithm ed25519-sha256)" header.d=linutronix.de header.b="1N0K5Yux" Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PLPnDS1DSAcZ for ; Mon, 6 Dec 2021 22:39:41 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by smtp2.osuosl.org (Postfix) with ESMTPS id B207A40515 for ; Mon, 6 Dec 2021 22:39:41 +0000 (UTC) Message-ID: <20211206210439.128089025@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1638830380; 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=yTGriMSBQw12ZMYwEGW0S48cT2DY3/1yk7kZdgU1pmY=; b=abvHkvl7MHes9mfOR9bqibGGIq+vx064Sx/2IoxZNFoXq1/arNYeM7Fbw9vyud2BFpcCyl 8gYXLi5T6uox7YrF/wkwGrMbOYbu8YeDNLMftUhInxY9rK7K3bLobmPm3i1yFDmDTt3Sz8 FivfavzedB+NMyNAHZGsBXI5xY3YXl5/y7Z8BJwltsgNA86ygdtVAKJ9/QL9NYaT4aF83x FfUbp+918U2Of/Jb3GGCZN/G6A6CFJdtTNeZeidruI3SVzDwS/Wqx5Mwzt5+j9ENoiITfF 2EmWdlKv5+TyJK4oh9mDVyz937Nyh0L46t/la0gvE9sDn8q0Hx5sEwvmQSn/0g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1638830380; 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=yTGriMSBQw12ZMYwEGW0S48cT2DY3/1yk7kZdgU1pmY=; b=1N0K5YuxqLac5NJ0H3KkeMbsgwgxSEc2RhXJyC59uy5mjovjdeMAYcA2crOwpjyQKiRZJy VIAHD13n0j3h8SAA== From: Thomas Gleixner To: LKML Subject: [patch V2 27/36] genirq/msi: Provide interface to retrieve Linux interrupt number References: <20211206210307.625116253@linutronix.de> MIME-Version: 1.0 Date: Mon, 6 Dec 2021 23:39:39 +0100 (CET) Cc: Nishanth Menon , Mark Rutland , Stuart Yoder , linux-pci@vger.kernel.org, Will Deacon , Ashok Raj , Marc Zygnier , Sinan Kaya , iommu@lists.linux-foundation.org, Bjorn Helgaas , Megha Dey , Jason Gunthorpe , xen-devel@lists.xenproject.org, Kevin Tian , Alex Williamson , Cedric Le Goater , Santosh Shilimkar , linux-arm-kernel@lists.infradead.org, Juergen Gross , Tero Kristo , Greg Kroah-Hartman , Vinod Koul , dmaengine@vger.kernel.org, Robin Murphy 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" This allows drivers to retrieve the Linux interrupt number instead of fiddling with MSI descriptors. msi_get_virq() returns the Linux interrupt number or 0 in case that there is no entry for the given MSI index. Signed-off-by: Thomas Gleixner --- V2: Simplify the implementation and let PCI deal with the PCI specialities - Marc --- include/linux/msi.h | 2 ++ kernel/irq/msi.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -170,6 +170,8 @@ static inline bool msi_device_has_proper static inline void msi_device_set_properties(struct device *dev, unsigned long prop) { } #endif +unsigned int msi_get_virq(struct device *dev, unsigned int index); + /* Helpers to hide struct msi_desc implementation details */ #define msi_desc_to_dev(desc) ((desc)->dev) #define dev_to_msi_list(dev) (&(dev)->msi_list) --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -129,6 +129,42 @@ int msi_setup_device_data(struct device return 0; } +/** + * msi_get_virq - Return Linux interrupt number of a MSI interrupt + * @dev: Device to operate on + * @index: MSI interrupt index to look for (0-based) + * + * Return: The Linux interrupt number on success (> 0), 0 if not found + */ +unsigned int msi_get_virq(struct device *dev, unsigned int index) +{ + struct msi_desc *desc; + bool pcimsi; + + if (!dev->msi.data) + return 0; + + pcimsi = msi_device_has_property(dev, MSI_PROP_PCI_MSI); + + for_each_msi_entry(desc, dev) { + /* PCI-MSI has only one descriptor for multiple interrupts. */ + if (pcimsi) { + if (desc->irq && index < desc->nvec_used) + return desc->irq + index; + break; + } + + /* + * PCI-MSIX and platform MSI use a descriptor per + * interrupt. + */ + if (desc->msi_index == index) + return desc->irq; + } + return 0; +} +EXPORT_SYMBOL_GPL(msi_get_virq); + #ifdef CONFIG_SYSFS static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, char *buf) _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu