linux-kernel - Re: [PATCH v7 05/23] iommu: Introduce cache

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Date:   Thu, 2 May 2019 11:53:34 +0100
From:   Jean-Philippe Brucker <jean-philippe.brucker@....com>
To:     Auger Eric <eric.auger@...hat.com>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "yi.l.liu@...el.com" <yi.l.liu@...el.com>,
        Will Deacon <Will.Deacon@....com>,
        Robin Murphy <Robin.Murphy@....com>
Cc:     "peter.maydell@...aro.org" <peter.maydell@...aro.org>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        Vincent Stehle <Vincent.Stehle@....com>,
        "ashok.raj@...el.com" <ashok.raj@...el.com>,
        Marc Zyngier <Marc.Zyngier@....com>,
        Christoffer Dall <Christoffer.Dall@....com>
Subject: Re: [PATCH v7 05/23] iommu: Introduce cache_invalidate API

On 02/05/2019 07:58, Auger Eric wrote:
> Hi Jean-Philippe,
> 
> On 5/1/19 12:38 PM, Jean-Philippe Brucker wrote:
>> On 08/04/2019 13:18, Eric Auger wrote:
>>> +int iommu_cache_invalidate(struct iommu_domain *domain, struct device *dev,
>>> +			   struct iommu_cache_invalidate_info *inv_info)
>>> +{
>>> +	int ret = 0;
>>> +
>>> +	if (unlikely(!domain->ops->cache_invalidate))
>>> +		return -ENODEV;
>>> +
>>> +	ret = domain->ops->cache_invalidate(domain, dev, inv_info);
>>> +
>>> +	return ret;
>>
>> Nit: you don't really need ret
>>
>> The UAPI looks good to me, so
>>
>> Reviewed-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
> Just to make sure, do you accept changes proposed by Jacob in
> https://lkml.org/lkml/2019/4/29/659 ie.
> - the addition of NR_IOMMU_INVAL_GRANU in enum iommu_inv_granularity and
> - the addition of NR_IOMMU_CACHE_TYPE

Ah sorry, I forgot about that, I'll review the next version. Yes they
can be useful (maybe call them IOMMU_INV_GRANU_NR and
IOMMU_CACHE_INV_TYPE_NR?). I guess it's legal to export in UAPI values
that will change over time, as VFIO also does it in its enums.

Thanks,
Jean