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powerpc/mm: Dump hash table

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Useful to be able to dump the kernel hash page table to check
which pages are hashed along with their sizes and other details.

Add a debugfs file to check the hash page table. If radix is enabled
(and so there is no hash page table) then this file doesn't exist. To
use this the PPC_PTDUMP config option must be selected.

Signed-off-by: Rashmica Gupta <rashmicy@gmail.com>
[mpe: Fix build with SPARSEMEM_VMEMMAP=n & PSERIES=n]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Rashmica Gupta
2016-05-27 15:49:00 +10:00
committed by Michael Ellerman
parent 8eb07b1870
commit 1515ab9321
2 changed files with 553 additions and 1 deletions
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3
arch/powerpc/mm/Makefile
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@@ -42,4 +42,5 @@ obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-noncoherent.o
obj-$(CONFIG_HIGHMEM) += highmem.o
obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o
obj-$(CONFIG_SPAPR_TCE_IOMMU) += mmu_context_iommu.o
obj-$(CONFIG_PPC_PTDUMP) += dump_linuxpagetables.o
obj-$(CONFIG_PPC_PTDUMP) += dump_linuxpagetables.o \
dump_hashpagetable.o

551
arch/powerpc/mm/dump_hashpagetable.c Normal file
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