On Tue, Feb 09, 2021 at 12:45:11PM +, Robin Murphy wrote:
> It's not a bug, it's a fundamental design failure. dma_get_sgtable() has
> only ever sort-of-worked for DMA buffers that come from CMA or regular page
> allocations. In particular, a "no-map" DMA pool is not backed by kernel
> memor
On 2021-02-09 12:36, Sumit Garg wrote:
Hi Christoph,
On Tue, 9 Feb 2021 at 15:06, Christoph Hellwig wrote:
On Tue, Feb 09, 2021 at 10:23:12AM +0100, Greg KH wrote:
From the view point of ZeroCopy using DMABUF, is 5.4 not
mature enough, and is 5.10 enough mature ?
This is the most impor
Hi Christoph,
On Tue, 9 Feb 2021 at 15:06, Christoph Hellwig wrote:
>
> On Tue, Feb 09, 2021 at 10:23:12AM +0100, Greg KH wrote:
> > > From the view point of ZeroCopy using DMABUF, is 5.4 not
> > > mature enough, and is 5.10 enough mature ?
> > > This is the most important point for judging m
On Tue, Feb 09, 2021 at 10:19:07AM +, obayashi.yoshim...@socionext.com
wrote:
> > How do you judge "mature"?
>
> My basic criteria are
> * Function is exist, but bug fix is necessary: "mature"
> * Function extension is necessary: "immature"
>
> > And again, if a feature isn't present in a
; To: Obayashi, Yoshimasa/尾林 善正
> Cc: sumit.g...@linaro.org; h...@lst.de; m.szyprow...@samsung.com;
> robin.mur...@arm.com;
> io...@lists.linux-foundation.org; linux-kernel@vger.kernel.org;
> sta...@vger.kernel.org;
> daniel.thomp...@linaro.org
> Subject: Re: DMA direct mapping
On Tue, Feb 09, 2021 at 10:23:12AM +0100, Greg KH wrote:
> > From the view point of ZeroCopy using DMABUF, is 5.4 not
> > mature enough, and is 5.10 enough mature ?
> > This is the most important point for judging migration.
>
> How do you judge "mature"?
>
> And again, if a feature isn't pr
On Tue, Feb 09, 2021 at 09:05:40AM +, obayashi.yoshim...@socionext.com
wrote:
> > > As the drivers are currently under development and Socionext has
> > > chosen 5.4 stable kernel for their development. So I will let
> > > Obayashi-san answer this if it's possible for them to migrate to 5.10
>
y, February 9, 2021 5:04 PM
> To: Sumit Garg
> Cc: Obayashi, Yoshimasa/尾林 善正 ; h...@lst.de;
> m.szyprow...@samsung.com; robin.mur...@arm.com;
> io...@lists.linux-foundation.org; Linux Kernel Mailing
> List ; stable ; Daniel
> Thompson
>
> Subject: Re: DMA direct mapping fix fo
On Tue, Feb 09, 2021 at 01:28:47PM +0530, Sumit Garg wrote:
> Thanks Greg for your response.
>
> On Tue, 9 Feb 2021 at 12:28, Greg Kroah-Hartman
> wrote:
> >
> > On Tue, Feb 09, 2021 at 11:39:25AM +0530, Sumit Garg wrote:
> > > Hi Christoph, Greg,
> > >
> > > Currently we are observing an incorre
Thanks Greg for your response.
On Tue, 9 Feb 2021 at 12:28, Greg Kroah-Hartman
wrote:
>
> On Tue, Feb 09, 2021 at 11:39:25AM +0530, Sumit Garg wrote:
> > Hi Christoph, Greg,
> >
> > Currently we are observing an incorrect address translation
> > corresponding to DMA direct mapping methods on 5.4
On Tue, Feb 09, 2021 at 11:39:25AM +0530, Sumit Garg wrote:
> Hi Christoph, Greg,
>
> Currently we are observing an incorrect address translation
> corresponding to DMA direct mapping methods on 5.4 stable kernel while
> sharing dmabuf from one device to another where both devices have
> their own
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