From: Daniel Vetter <daniel@ffwll.ch>
To: John Stultz <john.stultz@linaro.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Sandeep Patil <sspatil@google.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Chenbo Feng <fengc@google.com>,
Alistair Strachan <astrachan@google.com>,
Liam Mark <lmark@codeaurora.org>, Yue Hu <huyue2@yulong.com>,
dri-devel@lists.freedesktop.org, "Andrew F . Davis" <afd@ti.com>,
Hridya Valsaraju <hridya@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Pratik Patel <pratikp@codeaurora.org>
Subject: Re: [RFC][PATCH 0/2] Allow DMA BUF heaps to be loaded as modules
Date: Mon, 4 Nov 2019 10:58:23 +0100 [thread overview]
Message-ID: <20191104095823.GD10326@phenom.ffwll.local> (raw)
In-Reply-To: <20191025234834.28214-1-john.stultz@linaro.org>
On Fri, Oct 25, 2019 at 11:48:32PM +0000, John Stultz wrote:
> Now that the DMA BUF heaps core code has been queued, I wanted
> to send out some of the pending changes that I've been working
> on.
>
> For use with Android and their GKI effort, it is desired that
> DMA BUF heaps are able to be loaded as modules. This is required
> for migrating vendors off of ION which was also recently changed
> to support modules.
>
> So this patch series simply provides the necessary exported
> symbols and allows the system and CMA drivers to be built
> as modules.
>
> Due to the fact that dmabuf's allocated from a heap may
> be in use for quite some time, there isn't a way to safely
> unload the driver once it has been loaded. Thus these
> drivers do no implement module_exit() functions and will
> show up in lsmod as "[permanent]"
>
> Feedback and thoughts on this would be greatly appreciated!
Do we actually want this?
I figured if we just state that vendors should set up all the right
dma-buf heaps in dt, is that not enough?
Exporting symbols for no real in-tree users feels fishy.
-Daniel
>
> thanks
> -john
>
> Cc: Laura Abbott <labbott@redhat.com>
> Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
> Cc: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: Liam Mark <lmark@codeaurora.org>
> Cc: Pratik Patel <pratikp@codeaurora.org>
> Cc: Brian Starkey <Brian.Starkey@arm.com>
> Cc: Andrew F. Davis <afd@ti.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Yue Hu <huyue2@yulong.com>
> Cc: Mike Rapoport <rppt@linux.ibm.com>
> Cc: Chenbo Feng <fengc@google.com>
> Cc: Alistair Strachan <astrachan@google.com>
> Cc: Sandeep Patil <sspatil@google.com>
> Cc: Hridya Valsaraju <hridya@google.com>
> Cc: dri-devel@lists.freedesktop.org
>
> John Stultz (1):
> dma-buf: heaps: Allow system & cma heaps to be configured as a modules
>
> Sandeep Patil (1):
> mm: cma: Export cma symbols for cma heap as a module
>
> drivers/dma-buf/dma-heap.c | 2 ++
> drivers/dma-buf/heaps/Kconfig | 4 ++--
> drivers/dma-buf/heaps/heap-helpers.c | 2 ++
> kernel/dma/contiguous.c | 1 +
> mm/cma.c | 5 +++++
> 5 files changed, 12 insertions(+), 2 deletions(-)
>
> --
> 2.17.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2019-11-04 9:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 23:48 [RFC][PATCH 0/2] Allow DMA BUF heaps to be loaded as modules John Stultz
2019-10-25 23:48 ` [RFC][PATCH 1/2] mm: cma: Export cma symbols for cma heap as a module John Stultz
2019-10-28 7:46 ` Christoph Hellwig
2019-10-28 18:39 ` John Stultz
2019-10-28 22:23 ` John Stultz
2019-10-28 19:12 ` sspatil
2019-10-28 20:03 ` John Stultz
2019-10-28 22:26 ` John Stultz
2019-10-25 23:48 ` [RFC][PATCH 2/2] dma-buf: heaps: Allow system & cma heaps to be configured as a modules John Stultz
2019-11-04 9:45 ` Brian Starkey
2019-11-04 10:24 ` Daniel Vetter
2019-11-04 19:00 ` John Stultz
2019-11-04 9:58 ` Daniel Vetter [this message]
2019-11-04 18:57 ` [RFC][PATCH 0/2] Allow DMA BUF heaps to be loaded as modules John Stultz
2019-11-05 9:42 ` Daniel Vetter
2019-11-05 13:30 ` Andrew F. Davis
2019-11-05 13:58 ` Daniel Vetter
2019-11-05 17:41 ` John Stultz
2019-11-05 19:18 ` Daniel Vetter
2019-11-05 19:47 ` John Stultz
2019-11-05 20:21 ` Daniel Vetter
2019-11-12 0:56 ` Sandeep Patil
2019-11-12 0:49 ` Sandeep Patil
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191104095823.GD10326@phenom.ffwll.local \
--to=daniel@ffwll.ch \
--cc=afd@ti.com \
--cc=akpm@linux-foundation.org \
--cc=astrachan@google.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=fengc@google.com \
--cc=hridya@google.com \
--cc=huyue2@yulong.com \
--cc=john.stultz@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lmark@codeaurora.org \
--cc=pratikp@codeaurora.org \
--cc=rppt@linux.ibm.com \
--cc=sspatil@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).