arm64: Add memory hotplug support

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Wire up the basic support for hot-adding memory. Since memory hotplug
is fairly tightly coupled to sparsemem, we tweak pfn_valid() to also
cross-check the presence of a section in the manner of the generic
implementation, before falling back to memblock to check for no-map
regions within a present section as before. By having arch_add_memory(()
create the linear mapping first, this then makes everything work in the
way that __add_section() expects.

We expect hotplug to be ACPI-driven, so the swapper_pg_dir updates
should be safe from races by virtue of the global device hotplug lock.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Robin Murphy 2018-12-11 18:48:48 +00:00 • committed by Will Deacon

parent 6e4ede698d

commit 4ab2150615

4 changed files with 38 additions and 0 deletions

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3

arch/arm64/Kconfig

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8

arch/arm64/mm/init.c

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17

arch/arm64/mm/mmu.c

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10

arch/arm64/mm/numa.c

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