Re: New API for non cache coherent ppc cpu's

Dan Malek writes:

That's exactly what it is.  We are not creating a new API, and it shouldn't
have been described as such.

OK... Armin's message wasn't exactly clear... :)

They do.  Recently a pci_sync_page was added for some reason (because

To go with pci_map_page and pci_unmap_page.  These give you the
ability to do DMA to highmem pages without using bounce buffers.

quoted

If you're talking about non-PCI devices, use the pci DMA API but just
pass NULL for the dev (we need to make sure that will work ok on the
non-cache-coherent cpus).

Ummm....I don't normally do this because using these functions requires
the CONFIG_PCI option, which isn't supported or has bad effects when
requested on processors that don't have PCI.  For non-PCI devices,
I call the consistent_* functions, which other architectures support
and do as well.  So, we kind of have a common interface here for non-PCI
devices as well.

My preference would be to make the one set of functions work
everywhere.  OTOH these non-PCI devices you're talking about are
presumably very specific to PPC embedded chips so maybe it doesn't
matter so much.

Paul.

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