linux-kernel - Re: [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID allocator with IOASID

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Date:   Fri, 1 Nov 2019 11:29:33 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID
 allocator with IOASID

On Fri, 25 Oct 2019 13:47:25 +0800
Lu Baolu <baolu.lu@...ux.intel.com> wrote:

> Hi,
> 
> On 10/25/19 3:54 AM, Jacob Pan wrote:
> > Make use of generic IOASID code to manage PASID allocation,
> > free, and lookup. Replace Intel specific code.
> > 
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > ---
> >   drivers/iommu/intel-iommu.c | 12 ++++++------
> >   drivers/iommu/intel-pasid.c | 36
> > ------------------------------------ drivers/iommu/intel-svm.c   |
> > 39 +++++++++++++++++++++++---------------- 3 files changed, 29
> > insertions(+), 58 deletions(-)  
> 
> [--cut--]
> 
> > @@ -458,10 +465,11 @@ int intel_svm_is_pasid_valid(struct device
> > *dev, int pasid) if (!iommu)
> >   		goto out;
> >   
> > -	svm = intel_pasid_lookup_id(pasid);
> > -	if (!svm)
> > +	svm = ioasid_find(NULL, pasid, NULL);
> > +	if (IS_ERR(svm)) {  
> 
> Shall we check whether svm is NULL?
> 
Missed this earlier, you are right we need to check for NULL.
Thanks,

> Others looks good to me.
> 
> Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> Best regards,
> baolu

[Jacob Pan]