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From: "Stephen  Bates" <sbates@raithlin.com>
Subject: Re: [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory
Date: Wed, 14 Mar 2018 14:05:06 +0000
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To: Bjorn Helgaas <helgaas@kernel.org>, Logan Gunthorpe <logang@deltatee.com>
Cc: Jens Axboe <axboe@kernel.dk>, "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>, Alex Williamson <alex.williamson@redhat.com>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>, "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>, Sinan Kaya <okaya@codeaurora.org>, =?utf-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>, Jason Gunthorpe <jgg@mellanox.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Bjorn Helgaas <bhelgaas@google.com>, Max Gurtovoy <maxg@mellanox.com>, Keith Busch <keith.busch@intel.com>, Christoph Hellwig <hch@lst.de>
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>I assume you want to exclude Root Ports because of multi-function
>  devices and the "route to self" error.  I was hoping for a reference
>  to that so I could learn more about it.

Apologies Bjorn. This slipped through my net. I will try and get you a reference for RTS in the next couple of days.
    
> While I was looking for it, I found sec 6.12.1.2 (PCIe r4.0), "ACS
> Functions in SR-IOV Capable and Multi-Function Devices", which seems
> relevant.  It talks about "peer-to-peer Requests (between Functions of
> the device)".  Thay says to me that multi-function devices can DMA
> between themselves.
    
I will go take a look. Appreciate the link.

Stephen 

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