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Re: [RFC 0/2] staging: ion: of_ion_device_get

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On 03/22/2016 04:08 PM, Moritz Fischer wrote:
> Hi Laura,
>
> On Tue, Mar 22, 2016 at 3:51 PM, Laura Abbott <labbott@redhat.com> wrote:
>
>> In the past what drivers have done is a foo_ion_client_create which has the
>> reference
>> to the ion_device created from ion_device_create. Drivers then call the
>> foo_ion_client_create function.
>
> Oh, so you mean you add a function to create a client to the platform
> device implementing
> the heap and the export this function?
>
> heap implements:
>
> foo_create_client();
>
> driver calls:
>
> foo_create_client() ?
>

Yes, exactly

>> Can you elaborate more on your sharing and allocation flow? This might
>> suggest
>> another idea.
>
> Well I'll have a bunch of DMA streams to / from an FPGA that contains
> DMA engines & accelerators. To that end
> my userland software would allocate say 64 buffers, hand them over to
> driver A to queue/deque them.
>
> In future I might want to share these buffers between streams and with
> other peripherals on the same bus,
> which is why I looked at ION.
>

If allocation is coming from userspace and drivers are only importing
you should be using the dma_buf APIs instead of Ion APIs directly.
Ion is a dma_buf exporter and dma_buf APIs are the preferred API.

> Thanks,
>
> Moritz
>

Thanks,
Laura

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[RFC 0/2] staging: ion: of_ion_device_get Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-22 23:40 +0100
  [RFC 2/2] staging: android: ion: Add of_ion_device_get function Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-22 23:40 +0100
    Re: [RFC 2/2] staging: android: ion: Add of_ion_device_get function Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-23 00:00 +0100
    Re: [RFC 2/2] staging: android: ion: Add of_ion_device_get function Dan Carpenter <dan.carpenter@oracle.com> - 2016-03-23 06:00 +0100
  Re: [RFC 0/2] staging: ion: of_ion_device_get Laura Abbott <labbott@redhat.com> - 2016-03-23 00:00 +0100
    Re: [RFC 0/2] staging: ion: of_ion_device_get Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-23 00:10 +0100
      Re: [RFC 0/2] staging: ion: of_ion_device_get Laura Abbott <labbott@redhat.com> - 2016-03-23 00:30 +0100
        Re: [RFC 0/2] staging: ion: of_ion_device_get Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-23 00:40 +0100
        Re: [RFC 0/2] staging: ion: of_ion_device_get Moritz Fischer <moritz.fischer@ettus.com> - 2016-03-23 00:50 +0100

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