Add udmabuf to kernel config #4
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From the docs: > udmabuf is a device driver which allows userspace to create > dmabufs. The memory used for these dmabufs must be backed by > memfd. It is becoming increasingly popular for multimedia related tasks and, from Fedora 41 and systemd 257 on, is available by default to users. The RPi4 and 5 can notably benefit from it as they lack hardware video decoders - udmabuf allows software decoders to allocate buffers that can be used by the powerful display engine. Signed-off-by: Robert Mader <robert.mader@collabora.com>
dwrobel
approved these changes
Mar 7, 2025
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Triggered a build: https://copr.fedorainfracloud.org/coprs/dwrobel/kernel-rpi-testing/builds/ Please also consider sending this to https://github.com/raspberrypi/linux (hopefully the usage in |
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Wow, that was fast, thanks! :) FYI., I also opened a request upstream: raspberrypi/linux#6706 |
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@dwrobel it works great btw., tested both RPi 4 and 5. |
Thanks! Pushed to stable: https://copr.fedorainfracloud.org/coprs/dwrobel/kernel-rpi/builds/. |
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From the docs:
It is becoming increasingly popular for multimedia related tasks and, from Fedora 41 and systemd 257 on, is available by default to users.
The RPi4 and 5 can notably benefit from it as they lack hardware video decoders - udmabuf allows software decoders to allocate buffers that can be used by the powerful display engine.
udmabuf was recently enabled by default in systemd and is used by the libcamera software ISP, mesa-llvmpipe and, hopefully soon, gstreamer. The later allows software decoded video to be displayed much more efficiently than existent/other approaches.