linux-kernel - Re: [PATCH 09/18] iommu/vt-d: Enlightened PASID allocation

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Message-ID: <20190409093413.603b5333@jacob-builder>
Date:   Tue, 9 Apr 2019 09:34:13 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Andriy Shevchenko <andriy.shevchenko@...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.brucker@....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>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 09/18] iommu/vt-d: Enlightened PASID allocation

On Tue, 9 Apr 2019 13:08:59 +0300
Andriy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> On Mon, Apr 08, 2019 at 04:59:24PM -0700, Jacob Pan wrote:
> > From: Lu Baolu <baolu.lu@...ux.intel.com>
> > 
> > If Intel IOMMU runs in caching mode, a.k.a. virtual IOMMU, the
> > IOMMU driver should rely on the emulation software to allocate
> > and free PASID IDs. The Intel vt-d spec revision 3.0 defines a
> > register set to support this. This includes a capability register,
> > a virtual command register and a virtual response register. Refer
> > to section 10.4.42, 10.4.43, 10.4.44 for more information.
> > 
> > This patch adds the enlightened PASID allocation/free interfaces
> > via the virtual command register.  
> 
> > +	pr_debug("vcmd alloc pasid\n");  
> 
> Perhaps tracepoints should be in use?
> OTOH we have function tracer, so, this message in any case is a noise.
> And this is applicable to other similar cases.
> 

Agreed, I added that for debug purpose.

Thanks,

Jacob