linux-kernel - Re: [PATCH 1/2] irq,pci: allow drivers to specify complex affinity requirement

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Date:   Mon, 7 Nov 2016 09:36:40 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Christoph Hellwig <hch@....de>, tglx@...utronix.de
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] irq,pci: allow drivers to specify complex affinity
 requirement

On 11/07/2016 12:07 AM, Christoph Hellwig wrote:
> 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 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.
> 
> It also removes the unused irq_affinity mask in struct pci_dev.  If we
> ever need that sort of functionality it should be passed through
> struct irq_affinity.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/pci/msi.c         | 61 ++++++++++++++++++++++++--------------------
>  include/linux/interrupt.h | 26 ++++++++++++++++---
>  include/linux/pci.h       | 14 ++++++----
>  kernel/irq/affinity.c     | 65 ++++++++++++++++++++++++-----------------------
>  4 files changed, 98 insertions(+), 68 deletions(-)
> 
Good idea.

Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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