linux-kernel - Re: [RFC PATCH] pci: add pci_irq_get_affinity

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Message-ID: <20161108145652.GA12817@lst.de>
Date:   Tue, 8 Nov 2016 15:56:52 +0100
From:   Christoph Hellwig <hch@....de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.com>
Subject: Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector()

On Tue, Nov 08, 2016 at 08:47:21AM +0100, Hannes Reinecke wrote:
> Add a reverse-mapping function to return the interrupt vector for
> any CPU if interrupt affinity is enabled.

What's the use case of it?

Also as-is this won't work due to the non-affinity vectors that
have the affinity set to all cpus.  It will get even worse if we have
to support things like virtio_net that have multiple interrupts per
CPU due to the send and receive virtqueues.