AW: PowerPC PCI DMA issues (prefetch/coherency?)

Pravin Bathija pbathija at
Fri Sep 11 19:23:37 EST 2009

Benjamin Herrenschmidt wrote:
> Do you know many drivers that do config space accesses without using
> the config space accessors ?

> Such drivers should be banned to oblivion.

> Cheers,
> Ben.

I'm not aware of such drivers in the 2.6.30+ kernel.

On Thu, 2009-09-10 at 22:35 -0700, Pravin Bathija wrote:
> Thanks Stefan. The whole intention of the patch/hack (or whatever one
> might call it :) ) was to avoid rogue drivers from setting
> pci_cache_line_size to non-zero value even though the underlying
> hardware doesn't support MRM calls. Nonetheless this approach works
> only if the drivers use the kernel API for PCI config space access
> provided by the powerpc platform driver.

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