From patchwork Mon Dec 6 22:39:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12660189 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 57A25C433F5 for ; Mon, 6 Dec 2021 22:48:14 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.240050.416307 (Exim 4.92) (envelope-from ) id 1muMm4-0001oK-EI; Mon, 06 Dec 2021 22:47:56 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 240050.416307; Mon, 06 Dec 2021 22:47:56 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1muMm4-0001o5-5C; Mon, 06 Dec 2021 22:47:56 +0000 Received: by outflank-mailman (input) for mailman id 240050; Mon, 06 Dec 2021 22:47:54 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1muMe4-0004ul-Ue for xen-devel@lists.xenproject.org; Mon, 06 Dec 2021 22:39:41 +0000 Received: from galois.linutronix.de (galois.linutronix.de [193.142.43.55]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 661cc391-56e5-11ec-8a4d-196798b21f7b; Mon, 06 Dec 2021 23:39:40 +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: 661cc391-56e5-11ec-8a4d-196798b21f7b 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 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 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) 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 Reviewed-by: Greg Kroah-Hartman --- 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)