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

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Date:   Wed, 22 Sep 2021 10:31:47 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Liu Yi L <yi.l.liu@...el.com>
Cc:     baolu.lu@...ux.intel.com, 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, david@...son.dropbear.id.au,
        nicolinc@...dia.com
Subject: Re: [RFC 04/20] iommu: Add iommu_device_get_info interface

Hi Jason,

On 9/22/21 12:19 AM, Jason Gunthorpe wrote:
> 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()

Yeah! Above are more friendly to the upper layer callers.

> 
> ?
> 
> Jason
> 

Best regards,
baolu