linux-kernel - Re: [PATCH v5 3/7] iommu: Move global PASID allocation from SVA to core

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Date:   Thu, 4 May 2023 14:26:33 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Joerg Roedel <joro@...tes.org>, dmaengine@...r.kernel.org,
        vkoul@...nel.org, Will Deacon <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        narayan.ranganathan@...el.com, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v5 3/7] iommu: Move global PASID allocation from SVA to
 core

Hi Baolu,

On Wed, 3 May 2023 14:32:15 +0800, Baolu Lu <baolu.lu@...ux.intel.com>
wrote:

> On 4/28/23 1:49 AM, Jacob Pan wrote:
> > +ioasid_t iommu_alloc_global_pasid_dev(struct device *dev)
> > +{
> > +	int ret;
> > +	ioasid_t max;
> > +
> > +	max = dev_iommu_get_max_pasids(dev);  
> 
> Perhaps you can use dev->iommu->max_pasids. It's static, so no need to
> recalculate it.
> 
sounds good!


Thanks,

Jacob