From patchwork Fri Feb 26 20:11:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dey, Megha" X-Patchwork-Id: 1445091 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DnLVd0NpDz9sBJ for ; Sat, 27 Feb 2021 07:15:05 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230113AbhBZUOW (ORCPT ); Fri, 26 Feb 2021 15:14:22 -0500 Received: from mga17.intel.com ([192.55.52.151]:35678 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231150AbhBZUOC (ORCPT ); Fri, 26 Feb 2021 15:14:02 -0500 IronPort-SDR: VxfR5jkt3HFxkn681jJcDta0X1KeYqEP8rBlGLR3rNCUxrT7N/VncmFDF1QYT1WzgTA0JcUM2m Ykl42Q2WsRvQ== X-IronPort-AV: E=McAfee;i="6000,8403,9907"; a="165846919" X-IronPort-AV: E=Sophos;i="5.81,209,1610438400"; d="scan'208";a="165846919" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2021 12:11:15 -0800 IronPort-SDR: nb0fcvfHHm0m8Hdy1+xls3a8hEnYNqDlXOEEWSI1luFshB5X1P5oXgEgsXgT8eoI0Qn46ShK9E yLC1P6ZemW2g== X-IronPort-AV: E=Sophos;i="5.81,209,1610438400"; d="scan'208";a="405109464" Received: from megha-z97x-ud7-th.sc.intel.com ([143.183.85.154]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-SHA; 26 Feb 2021 12:11:15 -0800 From: Megha Dey To: tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, dave.jiang@intel.com, ashok.raj@intel.com, kevin.tian@intel.com, dwmw@amazon.co.uk, x86@kernel.org, tony.luck@intel.com, dan.j.williams@intel.com, megha.dey@intel.com, jgg@mellanox.com, kvm@vger.kernel.org, iommu@lists.linux-foundation.org, alex.williamson@redhat.com, bhelgaas@google.com, maz@kernel.org, linux-pci@vger.kernel.org, baolu.lu@linux.intel.com, ravi.v.shankar@intel.com Subject: [Patch V2 13/13] genirq/msi: Provide helpers to return Linux IRQ/dev_msi hw IRQ number Date: Fri, 26 Feb 2021 12:11:17 -0800 Message-Id: <1614370277-23235-14-git-send-email-megha.dey@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1614370277-23235-1-git-send-email-megha.dey@intel.com> References: <1614370277-23235-1-git-send-email-megha.dey@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Dave Jiang Add new helpers to get the Linux IRQ number and device specific index for given device-relative vector so that the drivers don't need to allocate their own arrays to keep track of the vectors and hwirq for the multi vector device MSI case. Reviewed-by: Tony Luck Signed-off-by: Dave Jiang Signed-off-by: Megha Dey --- include/linux/msi.h | 2 ++ kernel/irq/msi.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/include/linux/msi.h b/include/linux/msi.h index 24abec0..d60a6ba 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -451,6 +451,8 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode, int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg); void platform_msi_domain_free_irqs(struct device *dev); +int msi_irq_vector(struct device *dev, unsigned int nr); +int dev_msi_hwirq(struct device *dev, unsigned int nr); /* When an MSI domain is used as an intermediate domain */ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 047b59d..f2a8f55 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -581,4 +581,48 @@ struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) return (struct msi_domain_info *)domain->host_data; } +/** + * msi_irq_vector - Get the Linux IRQ number of a device vector + * @dev: device to operate on + * @nr: device-relative interrupt vector index (0-based). + * + * Returns the Linux IRQ number of a device vector. + */ +int msi_irq_vector(struct device *dev, unsigned int nr) +{ + struct msi_desc *entry; + int i = 0; + + for_each_msi_entry(entry, dev) { + if (i == nr) + return entry->irq; + i++; + } + WARN_ON_ONCE(1); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(msi_irq_vector); + +/** + * dev_msi_hwirq - Get the device MSI hw IRQ number of a device vector + * @dev: device to operate on + * @nr: device-relative interrupt vector index (0-based). + * + * Return the dev_msi hw IRQ number of a device vector. + */ +int dev_msi_hwirq(struct device *dev, unsigned int nr) +{ + struct msi_desc *entry; + int i = 0; + + for_each_msi_entry(entry, dev) { + if (i == nr) + return entry->device_msi.hwirq; + i++; + } + WARN_ON_ONCE(1); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(dev_msi_hwirq); + #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */