From patchwork Fri Dec 10 22:19:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12671031 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 CE831C433FE for ; Fri, 10 Dec 2021 22:19:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344826AbhLJWXO (ORCPT ); Fri, 10 Dec 2021 17:23:14 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:50238 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344830AbhLJWXA (ORCPT ); Fri, 10 Dec 2021 17:23:00 -0500 Message-ID: <20211210221814.780824745@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1639174764; 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=ZEIc+hYHtGZ+R8Y42PTVzHWVlXMSBVtNMJGsH152424=; b=ZnOdjYsyWWWPA45DX/sEP1Hz7/N21g6u4UZdn8c1qyQRQwctj1a4i6BAp20kDLoVrj6D2s MbD+ZTo1q9CByKhQo2XRoN4WdhbqsWP8IhvQmO5n4QjDLb4bQeMj+tjt/r7iv7ulqjYgof F4ISSFlfQwvH4mj7rI3COb7fhYfIaOuZZwt6hdi7/i1KgHhxe1miuwBC9ALPHJWSgBGtAq Hm9GThVygPLyQUzGEUG99ih95uj7Ifn3w+/L6+ojF2urlcLuEKAYpMauAHf1+Mdai5rTl4 6N8IRoupzCe+vvFuCq6MovD0Voro2Z7OmtZqPzl66KvGCxnWY1NqHMI0nV1/OA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1639174764; 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=ZEIc+hYHtGZ+R8Y42PTVzHWVlXMSBVtNMJGsH152424=; b=IxahGrtxRlopXsWUYNpTNdhCUtnqonpOEodZ3IuQBz/DFc/KxGCheju7XzPFrWnx3hqpKg Kcg6g5cSFSWCRQCA== 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 , Juergen Gross , xen-devel@lists.xenproject.org, Arnd Bergmann , Michael Ellerman , Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, Bjorn Helgaas , 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 26/35] genirq/msi: Provide interface to retrieve Linux interrupt number References: <20211210221642.869015045@linutronix.de> MIME-Version: 1.0 Date: Fri, 10 Dec 2021 23:19:23 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Thomas Gleixner 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 Reviewed-by: Jason Gunthorpe --- 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 @@ -153,6 +153,8 @@ struct msi_device_data { int msi_setup_device_data(struct device *dev); +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 @@ -105,6 +105,42 @@ 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 = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false; + + 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)