linux-kernel - Re: [RFC 04/20] iommu: Add iommu_device_get

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Message-ID: <20210921161930.GP327412@nvidia.com>
Date:   Tue, 21 Sep 2021 13:19:30 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Liu Yi L <yi.l.liu@...el.com>
Cc:     alex.williamson@...hat.com, hch@....de, jasowang@...hat.com,
        joro@...tes.org, jean-philippe@...aro.org, kevin.tian@...el.com,
        parav@...lanox.com, lkml@...ux.net, pbonzini@...hat.com,
        lushenming@...wei.com, eric.auger@...hat.com, corbet@....net,
        ashok.raj@...el.com, yi.l.liu@...ux.intel.com,
        jun.j.tian@...el.com, hao.wu@...el.com, dave.jiang@...el.com,
        jacob.jun.pan@...ux.intel.com, kwankhede@...dia.com,
        robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, baolu.lu@...ux.intel.com,
        david@...son.dropbear.id.au, nicolinc@...dia.com
Subject: Re: [RFC 04/20] iommu: Add iommu_device_get_info interface

On Sun, Sep 19, 2021 at 02:38:32PM +0800, Liu Yi L wrote:
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> This provides an interface for upper layers to get the per-device iommu
> attributes.
> 
>     int iommu_device_get_info(struct device *dev,
>                               enum iommu_devattr attr, void *data);

Can't we use properly typed ops and functions here instead of a void
*data?

get_snoop()
get_page_size()
get_addr_width()

?

Jason