Re: Ordering between PCI config space writes and MMIO reads?

[Jeff Garzik]

On Tue, Oct 24, 2006 at 02:29:47PM -0700, Roland Dreier wrote:
>  > It is good to be conservative in this area. Some AMD chipsets at least
>  > had ordering problems with some configurations in the K7 era.
> 
> Could you expand a little?  Do you mean that the arch implementation
> of pci_write_config_xxx() should have extra barriers, or that drivers
> should do belt-and-suspenders flushes to make sure config writes are
> really done properly?

Drivers are -already- written to assume the pci_write_config_xxx() has
the requisite barriers.  The fix doesn't belong in the drivers.

	Jeff



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