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    SubjectRe: GPL only modules [was Re: [GIT PATCH] more Driver core patches for 2.6.19]
    On Wed, 13 Dec 2006 22:01:15 -0800
    "Hua Zhong" <hzhong@gmail.com> wrote:

    > > I think allowing binary hardware drivers in userspace hurts
    > > our ability to leverage companies to release hardware specs.
    >
    > If filesystems can be in user space, why can't drivers be in user space? On what *technical* ground?

    The FUSE file system interface provides a clean disciplined interface
    which allows an fs to live in user space. The uio layer (if its ever
    fixed and cleaned up) provides some basic hooks that allow a user space
    program to arbitarily control hardware and make a nasty undebuggable mess.

    uio also doesn't handle hotplug, pci and other "small" matters.

    Now if you wanted to make uio useful at minimum you would need

    - PCI support
    - The ability to mark sets of I/O addresses for the card as
    "unmappable", "read only", "read-write", "any read/root write", "root
    read/write"
    - A proper IRQ handler
    - A DMA interface
    - The ability to describe sharing rules

    Which actually is a description of the core of the DRM layer.
    -
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