Hi
Am 23.06.22 um 10:26 schrieb Christian König:
Am 23.06.22 um 10:13 schrieb Thomas Zimmermann:
Hi Christian
Am 15.02.21 um 09:58 schrieb Christian König:
Hi guys,
we are currently working an Freesync and direct scan out from system memory on AMD APUs in A+A laptops.
On problem we stumbled over is that our display hardware needs to scan out from uncached system memory and we currently don't have a way to communicate that through DMA-buf.
For our specific use case at hand we are going to implement something driver specific, but the question is should we have something more generic for this?
I had a patchset here that extends iosys-map (former dma-buf-map) with caching information. I'll post a copy.
Oh, nice. But why on iosys-map? We need that per DMA-buf.
It's returned via the dma-buf's vmap call within the iosys-map structure. If the dma-buf moves, the following vmap calls always return updated caching information. Maybe it's not quite what you need for Freesync?
I'll use this for format-conversion helpers, which do some optimizations for uncached memory.
Anyway, I have to look for that patch...
Best regards Thomas
Thanks, Christian.
Sorry for being late to reply.
Best regards Thomas
After all the system memory access pattern is a PCIe extension and as such something generic.
Regards, Christian. _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel