On 03/22/2016 04:08 PM, Moritz Fischer wrote:
Hi Laura,
On Tue, Mar 22, 2016 at 3:51 PM, Laura Abbott <labbott@xxxxxxxxxx> 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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