linux-kernel - Re: [PATCH 0/8] xen: dma-buf support for grant device

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Date:   Wed, 30 May 2018 21:46:28 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Oleksandr Andrushchenko <andr2000@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH 0/8] xen: dma-buf support for grant device



On 05/25/2018 11:33 AM, Oleksandr Andrushchenko wrote:

> 
> Oleksandr Andrushchenko (8):
>    xen/grant-table: Make set/clear page private code shared
>    xen/balloon: Move common memory reservation routines to a module
>    xen/grant-table: Allow allocating buffers suitable for DMA
>    xen/gntdev: Allow mappings for DMA buffers
>    xen/gntdev: Add initial support for dma-buf UAPI
>    xen/gntdev: Implement dma-buf export functionality
>    xen/gntdev: Implement dma-buf import functionality
>    xen/gntdev: Expose gntdev's dma-buf API for in-kernel use
> 
>   drivers/xen/Kconfig           |   23 +
>   drivers/xen/Makefile          |    1 +
>   drivers/xen/balloon.c         |   71 +--
>   drivers/xen/gntdev.c          | 1025 ++++++++++++++++++++++++++++++++-


I think this calls for gntdev_dma.c. I only had a quick look over gntdev 
changes but they very much are concentrated in dma-specific routines.

You essentially only share file_operations entry points with original 
gntdev code, right?

-boris


>   drivers/xen/grant-table.c     |  176 +++++-
>   drivers/xen/mem-reservation.c |  134 +++++
>   include/uapi/xen/gntdev.h     |  106 ++++
>   include/xen/grant_dev.h       |   37 ++
>   include/xen/grant_table.h     |   28 +
>   include/xen/mem_reservation.h |   29 +
>   10 files changed, 1527 insertions(+), 103 deletions(-)
>   create mode 100644 drivers/xen/mem-reservation.c
>   create mode 100644 include/xen/grant_dev.h
>   create mode 100644 include/xen/mem_reservation.h
>