Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

From	Laura Abbott <labbott@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging
Date	2017-03-03 20:20 +0100
Message-ID	<th0U9-5DA-5@gated-at.bofh.it> (permalink)
References	<tgGLL-8cb-5@gated-at.bofh.it> <tgYfE-3Kq-13@gated-at.bofh.it>
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On 03/03/2017 08:25 AM, Laurent Pinchart wrote:
> Hi Laura,
> 
> Thank you for the patches.
> 
> On Thursday 02 Mar 2017 13:44:32 Laura Abbott wrote:
>> Hi,
>>
>> There's been some recent discussions[1] about Ion-like frameworks. There's
>> apparently interest in just keeping Ion since it works reasonablly well.
>> This series does what should be the final clean ups for it to possibly be
>> moved out of staging.
>>
>> This includes the following:
>> - Some general clean up and removal of features that never got a lot of use
>>   as far as I can tell.
>> - Fixing up the caching. This is the series I proposed back in December[2]
>>   but never heard any feedback on. It will certainly break existing
>>   applications that rely on the implicit caching. I'd rather make an effort
>>   to move to a model that isn't going directly against the establishement
>>   though.
>> - Fixing up the platform support. The devicetree approach was never well
>>   recieved by DT maintainers. The proposal here is to think of Ion less as
>>   specifying requirements and more of a framework for exposing memory to
>>   userspace.
> 
> That's where most of my concerns with ion are. I still strongly believe that 
> the heap-based approach is inherently flawed, as it would need to be 
> configured for each device according to product-specific use cases. That's not 
> something that could be easily shipped with a generic distribution. We should 
> replace that with a constraint-based system.
> 

I don't think of constraints and heaps as being mutually exclusive. Some general
heaps (e.g. system heaps) can be available always. Others might just be
exposed if there is a particular memory region available. The constraint solving
is responsible for querying and figuring out what's the best choice.

Thanks,
Laura

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[RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
  [RFC PATCH 01/12] staging: android: ion: Remove dmap_cnt Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
  [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-03 17:50 +0100
      Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Laura Abbott <labbott@redhat.com> - 2017-03-03 20:00 +0100
        Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 11:50 +0100
          Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-06 14:50 +0100
            Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 17:00 +0100
              Re: [RFC PATCH 10/12] staging: android: ion: Use CMA APIs directly Laura Abbott <labbott@redhat.com> - 2017-03-06 20:30 +0100
  [RFC PATCH 09/12] cma: Introduce cma_for_each_area Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
  [RFC PATCH 03/12] staging: android: ion: Duplicate sg_table Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 03/12] staging: android: ion: Duplicate sg_table "Hillf Danton" <hillf.zj@alibaba-inc.com> - 2017-03-03 09:40 +0100
      Re: [RFC PATCH 03/12] staging: android: ion: Duplicate sg_table Laura Abbott <labbott@redhat.com> - 2017-03-03 19:50 +0100
  [RFC PATCH 11/12] staging: android: ion: Make Ion heaps selectable Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 11/12] staging: android: ion: Make Ion heaps  selectable Daniel Vetter <daniel@ffwll.ch> - 2017-03-03 16:10 +0100
      Re: [RFC PATCH 11/12] staging: android: ion: Make Ion heaps  selectable Laura Abbott <labbott@redhat.com> - 2017-03-03 20:50 +0100
  [RFC PATCH 05/12] staging: android: ion: Remove page faulting support Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
  [RFC PATCH 02/12] staging: android: ion: Remove alignment from allocation field Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
  [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for syncing and mapping Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for  syncing and mapping Dan Carpenter <dan.carpenter@oracle.com> - 2017-03-03 12:10 +0100
      Re: [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for  syncing and mapping Eric Engestrom <eric.engestrom@imgtec.com> - 2017-03-03 13:00 +0100
    Re: [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for syncing and mapping Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-03 17:40 +0100
      Re: [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for  syncing and mapping Laura Abbott <labbott@redhat.com> - 2017-03-03 19:50 +0100
  [RFC PATCH 07/12] staging: android: ion: Remove old platform support Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 07/12] staging: android: ion: Remove old platform  support Daniel Vetter <daniel@ffwll.ch> - 2017-03-03 11:40 +0100
  [RFC PATCH 06/12] staging: android: ion: Remove crufty cache support Laura Abbott <labbott@redhat.com> - 2017-03-02 22:50 +0100
    Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache  support Daniel Vetter <daniel@ffwll.ch> - 2017-03-03 11:00 +0100
      Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache support Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-03 18:00 +0100
        Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache  support Laura Abbott <labbott@redhat.com> - 2017-03-03 19:50 +0100
          Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache  support Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 11:50 +0100
            Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache support Emil Velikov <emil.l.velikov@gmail.com> - 2017-03-06 18:40 +0100
              Re: [RFC PATCH 06/12] staging: android: ion: Remove crufty cache  support Laura Abbott <labbott@redhat.com> - 2017-03-06 20:30 +0100
  Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-03 11:40 +0100
    Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-03 11:40 +0100
      Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Benjamin Gaignard <benjamin.gaignard@linaro.org> - 2017-03-03 15:50 +0100
    Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-03 17:50 +0100
      Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-03 20:20 +0100
      Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 11:50 +0100
        Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-06 16:10 +0100
          Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 17:40 +0100
  Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Michal Hocko <mhocko@kernel.org> - 2017-03-03 14:40 +0100
    Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-03 18:50 +0100
      Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Michal Hocko <mhocko@kernel.org> - 2017-03-06 09:10 +0100
        Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 12:00 +0100
          Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Mark Brown <broonie@kernel.org> - 2017-03-06 12:00 +0100
            Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-06 17:20 +0100
              Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Benjamin Gaignard <benjamin.gaignard@linaro.org> - 2017-03-09 11:10 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-09 19:10 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Brian Starkey <brian.starkey@arm.com> - 2017-03-10 11:40 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Robin Murphy <robin.murphy@arm.com> - 2017-03-10 12:50 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Brian Starkey <brian.starkey@arm.com> - 2017-03-10 15:30 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-10 17:50 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Daniel Vetter <daniel@ffwll.ch> - 2017-03-10 13:50 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Rob Clark <robdclark@gmail.com> - 2017-03-10 15:00 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Benjamin Gaignard <benjamin.gaignard@linaro.org> - 2017-03-12 14:40 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Daniel Vetter <daniel.vetter@ffwll.ch> - 2017-03-12 20:10 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-13 22:20 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Rob Clark <robdclark@gmail.com> - 2017-03-13 22:30 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-13 23:00 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Brian Starkey <brian.starkey@arm.com> - 2017-03-13 12:00 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Mark Brown <broonie@kernel.org> - 2017-03-13 14:30 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-13 22:50 +0100
                Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-13 22:30 +0100
          Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Michal Hocko <mhocko@kernel.org> - 2017-03-06 14:40 +0100
  Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2017-03-03 17:30 +0100
    Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of  staging Laura Abbott <labbott@redhat.com> - 2017-03-03 20:20 +0100

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