On Friday 26 October 2007 4:45:20 am Thomas Renninger wrote:
> On Thu, 2007-10-25 at 21:59 -0600, Bjorn Helgaas wrote:
> > On Thursday 25 October 2007 4:55:07 pm Thomas Renninger wrote:
> > > Also the BIOS developers seem to choose the regions in a very dump way
> > > sometimes.
> > > Just some imaginary values, but I saw similar (overlapping):
> > > - For a PNP device IO ports from 0x400-0x410 are reserved
> > > - A operation region is declared from 0x399-0x401
> >
> > If we know the resources the opregion can use, we can at least
> > reserve the union of those used by the opregion and by other
> > PNP devices. A little messy to deal with overlapping areas, I
> > agree, but it should still be possible by shrinking the region
> > or allocating a port at a time or something.
>
> You mean merging them together to something like:
> 0x400-0x410 pnp device
> 0x399 ACPI Op region's name
> This needs touching of kernel/resource.c and modification in a very ugly
> way affecting all architectures...
Right, that's what I was thinking. But I haven't tried it, so I'll
take your word for it that it's ugly.
> Maybe the list set up by this patch set should be similarly exported
> like /proc/ioports /proc/iomem
> to where ever appropriate (maybe /sys/devices/system/acpi/opreg_io
> and /sys/devices/system/acpi/opreg_mem?) to get a better overview what
> kind of devices are served by the Op regions on different machines.
I want to try hard to avoid making ACPI a special case in this way.
The current /proc/io{ports,mem} contains reservations for everything
else. I'd hate to have to look two places just because of ACPI.
> I think I worked on something else.
> Do I get this right:
> This one is to request all active resources of all ACPI devices that
> export resources via _CRS/_SRS?
> As this is currently done for the motherboard devices only by
> pnp/system.c?
Right. Actually my patch requests resources of all active PNP devices,
not just ACPI. Glad we didn't do overlapping work here :-)
> If you are interested I can try to fast cleanup and send you a
> pre-version of all patches (but not before beginning of next week).
Thanks for the preview. No hurry as far as I'm concerned.
Bjorn
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