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

[Oleksandr Andrushchenko]

On 05/31/2018 04:46 AM, Boris Ostrovsky wrote:
> On 05/25/2018 11:33 AM, Oleksandr Andrushchenko wrote:
>
> > Oleksandr Andrushchenko (8):
> > ÂÂ xen/grant-table: Make set/clear page private code shared
> > ÂÂ xen/balloon: Move common memory reservation routines to a module
> > ÂÂ xen/grant-table: Allow allocating buffers suitable for DMA
> > ÂÂ xen/gntdev: Allow mappings for DMA buffers
> > ÂÂ xen/gntdev: Add initial support for dma-buf UAPI
> > ÂÂ xen/gntdev: Implement dma-buf export functionality
> > ÂÂ xen/gntdev: Implement dma-buf import functionality
> > ÂÂ xen/gntdev: Expose gntdev's dma-buf API for in-kernel use
> >
> > Â drivers/xen/KconfigÂÂÂÂÂÂÂÂÂÂ |ÂÂ 23 +
> > Â drivers/xen/MakefileÂÂÂÂÂÂÂÂÂ |ÂÂÂ 1 +
> > Â drivers/xen/balloon.cÂÂÂÂÂÂÂÂ |ÂÂ 71 +--
> > Â drivers/xen/gntdev.cÂÂÂÂÂÂÂÂÂ | 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
> > Â drivers/xen/grant-table.cÂÂÂÂ |Â 176 +++++-
> > Â drivers/xen/mem-reservation.c |Â 134 +++++
> > Â include/uapi/xen/gntdev.hÂÂÂÂ |Â 106 ++++
> > Â include/xen/grant_dev.hÂÂÂÂÂÂ |ÂÂ 37 ++
> > Â include/xen/grant_table.hÂÂÂÂ |ÂÂ 28 +
> > Â include/xen/mem_reservation.h |ÂÂ 29 +
> > Â 10 files changed, 1527 insertions(+), 103 deletions(-)
> > Â create mode 100644 drivers/xen/mem-reservation.c
> > Â create mode 100644 include/xen/grant_dev.h
> > Â create mode 100644 include/xen/mem_reservation.h