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 ThomasAfter all the system memory access pattern is a PCIe extension and as such something generic.Regards, Christian. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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