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

[Alan Cox]

Ar Maw, 2006-10-24 am 12:13 -0700, ysgrifennodd Roland Dreier:
>  1) Is this something that should be fixed in the driver?  The PCI
>     spec allows MMIO cycles to start before an earlier config cycle
>     completed, but do we want to expose this fact to drivers?  Would
>     it be better for ia64 to use some sort of barrier to make sure
>     pci_write_config_xxx() is strongly ordered with MMIO?

It is good to be conservative in this area. Some AMD chipsets at least
had ordering problems with some configurations in the K7 era.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/