Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 26 Apr 2010 18:40:54 -0700 | From | Jesse Barnes <> | Subject | Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below BIOS_END |
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On Mon, 26 Apr 2010 18:27:27 -0700 (PDT) Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > > On Mon, 26 Apr 2010, Jesse Barnes wrote: > > > > Glad we agree. As I said (and echoing Bjorn), I think it would be best > > to reserve this space in a way that doesn't just use IORESOURCE_BUSY. > > We want and need to do allocations from the special region, so we > > should mark it as such. > > I think Bjorn's patch to pcibios_align_resource() is really good and > clever, and I think it should take care of the need for IORESOURCE_BUSY, > no? We do want to let devices that are _already_ allocated there insert > their resources, it's just that we never want to allocate new ones in the > low 1M region. > > Do we actually have a regression left with Bjorn's patch?
No, I think we're covered. But it sounded like Peter was also concerned about making new allocations from the 1M space, which would mean we'd need something other than the IORESOURCE_BUSY bit. But maybe Bjorn's patch plus simply removing the IORESOURCE_BUSY line is sufficient for that. The downside there is that it doesn't clearly communicate the special nature of the 1M region.
-- Jesse Barnes, Intel Open Source Technology Center
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