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

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Date:   Thu, 31 May 2018 08:51:35 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.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 05/31/2018 04:46 AM, Boris Ostrovsky wrote:
>
>
> 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 assume you mean as a separate file (part of gntdev driver)?
> I only had a quick look over gntdev changes but they very much are 
> concentrated in dma-specific routines.
>
I tried to do that, but there are some dependencies between the gntdev.c 
and gntdev_dma.c,
so finally I decided to put it all together.
> You essentially only share file_operations entry points with original 
> gntdev code, right?
>
fops + mappings done by gntdev (struct grant_map) and I need to release 
map on dma_buf .release
callback which makes some cross-dependencies between modules which 
seemed to be not cute
(gntdev keeps its all structs and functions inside, so I cannot easily 
access those w/o
helpers).

But I'll try one more time and move all DMA specific stuff into gntdev_dma.c
> -boris
>
Thank you,
Oleksandr
>
>>   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
>>