Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB

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Subject: Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
From: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Date: Mon, 5 Mar 2018 13:16:52 -0700
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, "linux-nvdimm@xxxxxxxxxxxx" <linux-nvdimm@xxxxxxxxxxxx>, linux-rdma@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, Keith Busch <keith.busch@xxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Jérôme Glisse <jglisse@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Max Gurtovoy <maxg@xxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>
In-reply-to: <20180305201053.GK11337@mellanox.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0



On 05/03/18 01:10 PM, Jason Gunthorpe wrote:

So when reading the above mlx code, we see the first wmb() being used
to ensure that CPU stores to cachable memory are visible to the DMA
triggered by the doorbell ring.


Oh, yes, that makes sense. Disregard my previous email as I was wrong.

Logan

References:
- [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
  - From: Logan Gunthorpe
- [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  - From: Logan Gunthorpe
- Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  - From: Oliver
- Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  - From: Keith Busch
- Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  - From: Sagi Grimberg
- Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  - From: Jason Gunthorpe

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