lkml.org 
[lkml]   [2020]   [Jan]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC][PATCH 12/15] videobuf2: add begin/end cpu_access callbacks to dma-sg
On (20/01/10 11:13), Hans Verkuil wrote:
> On 12/17/19 4:20 AM, Sergey Senozhatsky wrote:
> > Provide begin_cpu_access() and end_cpu_access() dma_buf_ops
> > callbacks for cache synchronisation on exported buffers.
> >
> > Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> > ---
> > .../media/common/videobuf2/videobuf2-dma-sg.c | 22 +++++++++++++++++++
> > 1 file changed, 22 insertions(+)
> >
> > diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> > index 6db60e9d5183..bfc99a0cb7b9 100644
> > --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> > +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> > @@ -470,6 +470,26 @@ static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf)
> > vb2_dma_sg_put(dbuf->priv);
> > }
> >
>
> There is no corresponding vb2_sg_buffer_consistent function here.
>
> Looking more closely I see that vb2_dma_sg_alloc doesn't pass the dma_attrs
> argument to dma_map_sg_attrs, thus V4L2_FLAG_MEMORY_NON_CONSISTENT has no
> effect on dma-sg buffers.
>
> Is there a reason why dma_attrs isn't passed on to dma_map_sg_attrs()?

Laziness.

> I suspect it was just laziness in the past, and that it should be wired
> up, just as for dma-contig.

OK, I can include it into v2.

-ss

\
 
 \ /
  Last update: 2020-01-22 07:37    [W:0.079 / U:2.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site