From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752767AbcKHOvB (ORCPT ); Tue, 8 Nov 2016 09:51:01 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:55077 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752601AbcKHOu7 (ORCPT ); Tue, 8 Nov 2016 09:50:59 -0500 Date: Tue, 8 Nov 2016 15:48:25 +0100 (CET) From: Thomas Gleixner To: Hannes Reinecke cc: Christoph Hellwig , Jens Axboe , linux-block@vger.kernel.org, linux-pci@vger.kernel.org, Linux Kernel Mailinglist , Hannes Reinecke Subject: Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() In-Reply-To: <1478591241-123356-1-git-send-email-hare@suse.de> Message-ID: References: <1478591241-123356-1-git-send-email-hare@suse.de> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 8 Nov 2016, Hannes Reinecke wrote: > Add a reverse-mapping function to return the interrupt vector for > any CPU if interrupt affinity is enabled. > > Signed-off-by: Hannes Reinecke > --- > drivers/pci/msi.c | 36 ++++++++++++++++++++++++++++++++++++ > include/linux/pci.h | 1 + > 2 files changed, 37 insertions(+) > > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > index bfdd074..de5ed32 100644 > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -1302,6 +1302,42 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) > } > EXPORT_SYMBOL(pci_irq_get_affinity); > > +/** > + * pci_irq_get_affinity_vector - return the vector number for a given CPU > + * @dev: PCI device to operate on > + * @cpu: cpu number > + * > + * Returns the vector number for CPU @cpu or a negative error number > + * if interrupt affinity is not set. > + */ > +int pci_irq_get_affinity_vector(struct pci_dev *dev, int cpu) > +{ > + if (dev->msix_enabled) { > + struct msi_desc *entry; > + > + for_each_pci_msi_entry(entry, dev) { > + if (cpumask_test_cpu(cpu, entry->affinity)) entry->affinity can be NULL