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

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Message-ID: <fa050c85-f236-2f70-414b-80c095d825cb@gmail.com>
Date:   Fri, 1 Jun 2018 08:42:23 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Oleksandr_Andrushchenko@...m.com" <Oleksandr_Andrushchenko@...m.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
Subject: Re: [PATCH 0/8] xen: dma-buf support for grant device

On 05/31/2018 11:25 PM, Boris Ostrovsky wrote:
> On 05/31/2018 10:41 AM, Oleksandr Andrushchenko wrote:
>> On 05/31/2018 08:51 AM, Oleksandr Andrushchenko wrote:
>>> 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
>> Could you please take a quick look at the way I re-structured the
>> sources here [1]?
>> If this is what you meant.
>
> I looked at final gntdev.c code and I think at least one of the chunks
> there ("DMA buffer export support. ") can also be moved out. It still
> have a bit too many ifdefs but it looks better to my eye than jamming
> everything into a single file (and I think more code can be moved out,
> but we can talk about it when you post the patches so that we can see
> context).
Sure, will send v2 after I re-check all the patches
and run some smoke tests again
>
> BTW, I believe it won't build with !CONFIG_XEN_GNTDEV_DMABUF ---
> gntdev_remove_map() is defined under this option and is referenced later
> without it.
Will check, thank you
>
> -boris
>
>
>> Thank you,
>> Oleksandr
>>>> -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
>>>>>
>> [1]
>> https://github.com/andr2000/linux/commits/xen_tip_linux_next_xen_dma_buf_v2