powerpc: add real mode support for dma operations on powernv

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The existing TCE machine calls (tce_build and tce_free) only support
virtual mode as they call __raw_writeq for TCE invalidation what
fails in real mode.

This introduces tce_build_rm and tce_free_rm real mode versions
which do mostly the same but use "Store Doubleword Caching Inhibited
Indexed" instruction for TCE invalidation.

This new feature is going to be utilized by real mode support of VFIO.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Alexey Kardashevskiy 2013-08-28 18:37:43 +10:00 • committed by Benjamin Herrenschmidt

parent 8e0861fa3c

commit 8e0a1611cb

4 changed files with 87 additions and 19 deletions

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12

arch/powerpc/include/asm/machdep.h

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49

arch/powerpc/platforms/powernv/pci-ioda.c

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42

arch/powerpc/platforms/powernv/pci.c

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3

arch/powerpc/platforms/powernv/pci.h

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