Subj : [$] DMA addresses for UIO
To   : All
From : LWN.net
Date : Tue Apr 22 2025 18:30:08

[$] DMA addresses for UIO

Date:
Tue, 22 Apr 2025 17:24:27 +0000

Description:
The Userspace
I/O (UIO) subsystem was first added to the kernel by
Hans J. Koch for the 2.6.32 release in 2007.  Its purpose is to facilitate
the writing of drivers (mostly) in user space; to that end, it provides
access to a number of resources that user-space code normally cannot touch.
One piece that is missing, though, is DMA addresses. A proposal to
fill that gap from Bastien Curutchet is running into some opposition,
though.

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Link to news story:
https://lwn.net/Articles/1017449/


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