powerpc/mm: Add hooks for cxl

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This adds hooks into the core powerpc mm code for cxl.

The core powerpc code sometimes uses local tlbie. Unfortunately this won't
work with the current cxl driver as it relies on snooping tlbie broadcasts.

The cxl hardware can have TLB entries invalidated via MMIO but this is not
currently supported by the driver. In future we can make local tlbie smarter so
that it invalidates cxl contexts via MMIO when it needs to but for now we have
this workaround.

This workaround checks for any active cxl contexts and if so, disables local
tlbie.

This also adds a hook for when SLBs are invalidated. This ensures any
corresponding SLBs in cxl are also invalidated at the same time. This is
required for segment demotion.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Ian Munsie 2014-10-08 19:55:00 +11:00 • committed by Michael Ellerman

parent 0952173601

commit 4c6d9acce1

2 changed files with 7 additions and 1 deletions

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2

arch/powerpc/mm/copro_fault.c

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6

arch/powerpc/mm/hash_native_64.c

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