Re: [PATCH]PCI:disable resource decode in PCI BAR detection

[Shaohua Li]

On Thu, 2007-09-13 at 01:31 -0600, Matthew Wilcox wrote:
> On Thu, Sep 13, 2007 at 02:21:07PM +0800, Shaohua Li wrote:
> > http://bugzilla.kernel.org/show_bug.cgi?id=8833
> > We write 0xffffffff to BARs to detect BAR size, this will change BAR
> > base to 0xfxxxxxx depends on BAR size. In the bug, PCI MCFG base address
> > is 0xf4000000. One PCI device (gfx) has a 256M BAR, the detection code
> > will temprarily change it to 0xf0000000, so conflict with MCFG decode
> > range. Later memory based config space read/write address is decoded by
> > both MCH and gfx and cause a hang. This patch disables resource decode
> > in BAR size detection to avoid resource conflict. 
> 
> You missed the part where we have to avoid doing this for host bridges ...
> 
> http://marc.info/?l=linux-kernel&m=118809338631160&w=2
> 
> (I believe it's now queued in Greg's tree, and possibly Andrew's tree
> too)
Hmm, I don't know there is already a fix for this, so waste a whole
morning :(. yes, your patch looks better.

Thanks,
Shaohua
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