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In some cases userspace may need to create dmabuffers from userspace on such example is the software ISP part of libcamera which needs to allocate dma-buffers for the output of the software ISP. At first the plan was to allow console users access to /dev/dma_heap/*, this was discussed with various kernel folks here: https://lore.kernel.org/all/bb372250-e8b8-4458-bc99-dd8365b06991@redhat.com/ Giving console users access to the dma_heap's was deemed a bad idea because memory allocated this way is not accounted in cgroup limits. Giving access to /dev/udmabuf OTOH was deemed acceptable so that is what this patch adds. Resolves: #32662
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.