linux-kernel - Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches

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Message-ID: <366A8132-B88A-40F7-BDE3-DA542E45FC0C@raithlin.com>
Date:   Wed, 9 May 2018 16:30:32 +0000
From:   "Stephen  Bates" <sbates@...thlin.com>
To:     Jerome Glisse <jglisse@...hat.com>
CC:     Christian König <christian.koenig@....com>,
        "Logan Gunthorpe" <logang@...tatee.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "Christoph Hellwig" <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>
Subject: Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices
 behind switches

Hi Jerome

> Now inside that page table you can point GPU virtual address
> to use GPU memory or use system memory. Those system memory entry can
> also be mark as ATS against a given PASID.
    
Thanks. This all makes sense. 

But do you have examples of this in a kernel driver (if so can you point me too it) or is this all done via user-space? Based on my grepping of the kernel code I see zero EP drivers using in-kernel ATS functionality right now...

Stephen