Re: [PATCH RFC] UIO: Pass information about ioports to userspace

Hans J. Koch
2008-11-24T09:05:06Z

On Sun, Nov 23, 2008 at 05:41:22PM -0800, Greg KH wrote:
> On Sun, Nov 23, 2008 at 01:14:20PM +0100, Hans J. Koch wrote:
> > Devices sometimes have memory where all or parts of it can not be mapped to
> > userspace. But it might still be possible to access this memory from
> > userspace by other means. An example are PCI cards that advertise not only
> > mappable memory but also ioport ranges. On x86 architectures, these can be
> > accessed with ioperm, iopl, inb, outb, and friends. Mike Frysinger (CCed)
> > reported a similar problem on Blackfin arch where it doesn't seem to be easy
> > to mmap non-cached memory but it can still be accessed from userspace.
> >
> > This patch allows kernel drivers to pass information about such ports to
> > userspace. Similar to the existing mem[] array, it adds a port[] array to
> > struct uio_info. Each port range is described by start, size, and porttype.
>
> Looks good, but I think you also forgot the documentation update :)

Not forgotten, just delayed :-)
We had other changes lately that need documentation update as well. Big patch
will come Real Soon Now...

thanks,
Hans