linux-kernel - Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs

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Date:   Tue, 4 May 2021 15:00:50 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        Auger Eric <eric.auger@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Jonathan Corbet <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>, "Wu, Hao" <hao.wu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>
Subject: Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and
 allocation APIs

On Tue, May 04, 2021 at 08:41:48AM -0700, Jacob Pan wrote:
> > > 
> > > (also looking at ioasid.c, why do we need such a thin and odd wrapper
> > > around xarray?)
> > >   
> > 
> > I'll leave it to Jean and Jacob.

> Could you elaborate?

I mean stuff like this:

int ioasid_set_data(ioasid_t ioasid, void *data)
{
        struct ioasid_data *ioasid_data;
        int ret = 0;

        spin_lock(&ioasid_allocator_lock);
        ioasid_data = xa_load(&active_allocator->xa, ioasid);
        if (ioasid_data)
                rcu_assign_pointer(ioasid_data->private, data);
        else
                ret = -ENOENT;
        spin_unlock(&ioasid_allocator_lock);

        /*
         * Wait for readers to stop accessing the old private data, so the
         * caller can free it.
         */
        if (!ret)
                synchronize_rcu();

        return ret;
}
EXPORT_SYMBOL_GPL(ioasid_set_data);

It is a weird way to use xarray to have a structure which
itself is just a wrapper around another RCU protected structure.

Make the caller supply the ioasid_data memory, embedded in its own
element, get rid of the void * and rely on XA_ZERO_ENTRY to hold
allocated but not active entries.

Make the synchronize_rcu() the caller responsiblity, and callers
should really be able to use call_rcu()

Jason