From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932238AbcKHIMB (ORCPT ); Tue, 8 Nov 2016 03:12:01 -0500 Received: from mx2.suse.de ([195.135.220.15]:46105 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752961AbcKHIL7 (ORCPT ); Tue, 8 Nov 2016 03:11:59 -0500 Subject: Re: [PATCH 1/7] genirq/affinity: Introduce struct irq_affinity To: Christoph Hellwig , tglx@linutronix.de References: <1478544462-9549-1-git-send-email-hch@lst.de> <1478544462-9549-2-git-send-email-hch@lst.de> Cc: axboe@kernel.dk, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org From: Hannes Reinecke Message-ID: Date: Tue, 8 Nov 2016 09:11:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <1478544462-9549-2-git-send-email-hch@lst.de> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/07/2016 07:47 PM, Christoph Hellwig wrote: > From: Christogh Hellwig > > Some drivers (various network and RDMA adapter for example) have a MSI-X > vector layout where most of the vectors are used for I/O queues and should > have CPU affinity assigned to them, but some (usually 1 but sometimes more) > at the beginning or end are used for low-performance admin or configuration > work and should not have any explicit affinity assigned to them. > > This adds a new irq_affinity structure, which will be passed through a > variant of pci_irq_alloc_vectors that allows to specify these > requirements (and is extensible to any future quirks in that area) so that > the core IRQ affinity algorithm can take this quirks into account. > > Signed-off-by: Christogh Hellwig > --- > include/linux/interrupt.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h > index 72f0721..7284bcd 100644 > --- a/include/linux/interrupt.h > +++ b/include/linux/interrupt.h > @@ -232,6 +232,18 @@ struct irq_affinity_notify { > void (*release)(struct kref *ref); > }; > > +/** > + * struct irq_affinity - Description for auto irq affinity assignements > + * @pre_vectors: Reserved vectors at the beginning of the MSIX > + * vector space > + * @post_vectors: Reserved vectors at the end of the MSIX > + * vector space > + */ > +struct irq_affinity { > + int pre_vectors; > + int post_vectors; > +}; > + > #if defined(CONFIG_SMP) > > extern cpumask_var_t irq_default_affinity; > Reviewed-by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)