powerpc/64s: Relax PACA address limitations

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Book3S PACA memory allocation is restricted by the RMA limit and also
must not take SLB faults when accessed in virtual mode. Currently a
fixed 256MB limit is used for this, which is imprecise and sub-optimal.

Update the paca allocation limits to use use the ppc64_rma_size for RMA
limit, and share the safe_stack_limit() that is currently used for stack
allocations that must not take virtual mode faults.

The safe_stack_limit() name is changed to ppc64_bolted_size() to match
ppc64_rma_size and some comments are updated. We also need to use
early_mmu_has_feature() because we are now calling this function prior
to the jump label patching that enables mmu_has_feature().

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Change mmu_has_feature() to early_mmu_has_feature()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Nicholas Piggin 2017-12-22 21:17:13 +10:00 • committed by Michael Ellerman

parent c610d65c0a

commit 1af19331a3

3 changed files with 27 additions and 16 deletions

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13

arch/powerpc/kernel/paca.c

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4

arch/powerpc/kernel/setup.h

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26

arch/powerpc/kernel/setup_64.c

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