linux-kernel - Re: [PATCH RFC v2 02/18] irq/dev-msi: Add support for a new DEV

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Message-ID: <20200805221548.GK19097@mellanox.com>
Date:   Wed, 5 Aug 2020 19:15:48 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     "Dey, Megha" <megha.dey@...el.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
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        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
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Subject: Re: [PATCH RFC v2 02/18] irq/dev-msi: Add support for a new DEV_MSI
 irq domain

On Wed, Aug 05, 2020 at 07:18:39PM +0000, Dey, Megha wrote:

> Hence we will only have one create_dev_msi_domain which can be
> called by any device driver that wants to use the dev-msi IRQ domain
> to alloc/free IRQs. It would be the responsibility of the device
> driver to provide the correct device and update the dev->msi_domain.

I'm not sure that sounds like a good idea, why should a device driver
touch dev->msi_domain?

There was a certain appeal to the api I suggested by having everything
related to setting up the new IRQs being in the core code.

Jason