On Fri, Apr 24, 2020 at 5:27 PM Andrew F. Davis <afd@xxxxxx> wrote: > > This new export type exposes to userspace the SRAM area as a DMA-Heap, > this allows for allocations as DMA-BUFs that can be consumed by various > DMA-BUF supporting devices. > > Signed-off-by: Andrew F. Davis <afd@xxxxxx> > --- > .../devicetree/bindings/sram/sram.yaml | 8 + Separate patch and needs to go to DT list... > drivers/misc/Kconfig | 7 + > drivers/misc/Makefile | 1 + > drivers/misc/sram-dma-heap.c | 243 ++++++++++++++++++ > drivers/misc/sram.c | 20 +- > drivers/misc/sram.h | 17 ++ > 6 files changed, 292 insertions(+), 4 deletions(-) > create mode 100644 drivers/misc/sram-dma-heap.c > > diff --git a/Documentation/devicetree/bindings/sram/sram.yaml b/Documentation/devicetree/bindings/sram/sram.yaml > index 7b83cc6c9bfa..b8e33c8d205d 100644 > --- a/Documentation/devicetree/bindings/sram/sram.yaml > +++ b/Documentation/devicetree/bindings/sram/sram.yaml > @@ -105,6 +105,14 @@ patternProperties: > manipulation of the page attributes. > type: boolean > > + dma-heap-export: > + description: > + Similar to 'pool' and 'export' this region will be exported for use > + by drivers, devices, and userspace using the DMA-Heaps framework. > + NOTE: This region must be page aligned on start and end in order to > + properly allow manipulation of the page attributes. > + type: boolean Though I'm not sure this should be in DT. You have to change your firmware to enable a new kernel feature? We also already have 'export' which sounds like the same function. Or 'pool' though reading the description, I don't really understand it's use. What combination of all 3 of these options would be valid? Rob _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
