linux-kernel - Re: [PATCH 12/13] nvme: switch to use pci_alloc_irq

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Date:	Sun, 10 Jul 2016 05:59:26 +0200
From:	Christoph Hellwig <hch@....de>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Christoph Hellwig <hch@....de>, tglx@...utronix.de, axboe@...com,
	linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/13] nvme: switch to use pci_alloc_irq_vectors

On Thu, Jul 07, 2016 at 09:30:19PM +0200, Alexander Gordeev wrote:
> On Mon, Jul 04, 2016 at 05:39:33PM +0900, Christoph Hellwig wrote:
> > @@ -1575,6 +1546,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
> >  		dev->tagset.cmd_size = nvme_cmd_size(dev);
> >  		dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
> >  		dev->tagset.driver_data = dev;
> > +		dev->tagset.affinity_mask = to_pci_dev(dev->dev)->irq_affinity;
> >  
> >  		if (blk_mq_alloc_tag_set(&dev->tagset))
> >  			return 0;
> 
> Are there any post-init uses of blk_mq_tag_set::affinity_mask other than
> calling to blk_mq_alloc_tag_set()? If no, blk_mq_tag_set::affinity_mask
> is redundant, since the mask could be passed as a parameter.

We'll have to look at it in the block code when reinitializing rebuilding
the queue topology.  This isn't currently done, but we'll need it rather
soon.