[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAO_48GEpMUNOyTJbOQ0_Kwj8ym2O0iQrdk2E1McX5GeVCe8R2Q@mail.gmail.com>
Date: Thu, 22 Mar 2012 11:33:50 +0530
From: Sumit Semwal <sumit.semwal@...aro.org>
To: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: linaro-mm-sig@...ts.linaro.org,
LKML <linux-kernel@...r.kernel.org>,
DRI Development <dri-devel@...ts.freedesktop.org>,
linux-media@...r.kernel.org, Rob Clark <rob.clark@...aro.org>
Subject: Re: [Linaro-mm-sig] [PATCH] dma-buf: add support for kernel cpu access
On 20 March 2012 04:32, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> Big differences to other contenders in the field (like ion) is
> that this also supports highmem, so we have to split up the cpu
> access from the kernel side into a prepare and a kmap step.
>
> Prepare is allowed to fail and should do everything required so that
> the kmap calls can succeed (like swapin/backing storage allocation,
> flushing, ...).
>
> More in-depth explanations will follow in the follow-up documentation
> patch.
>
> Changes in v2:
>
> - Clear up begin_cpu_access confusion noticed by Sumit Semwal.
> - Don't automatically fallback from the _atomic variants to the
> non-atomic variants. The _atomic callbacks are not allowed to
> sleep, so we want exporters to make this decision explicit. The
> function signatures are explicit, so simpler exporters can still
> use the same function for both.
> - Make the unmap functions optional. Simpler exporters with permanent
> mappings don't need to do anything at unmap time.
>
> Changes in v3:
>
> - Adjust the WARN_ON checks for the new ->ops functions as suggested
> by Rob Clark and Sumit Semwal.
> - Rebased on top of latest dma-buf-next git.
>
> Changes in v4:
>
> - Fixup a missing - in a return -EINVAL; statement.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Thanks; applied to for-next.
> ---
<snip>
BR,
~Sumit.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists