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powerpc/book3s64/mm: enable transparent pud hugepage

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This is enabled only with radix translation and 1G hugepage size.  This
will be used with devdax device memory with a namespace alignment of 1G.

Anon transparent hugepage is not supported even though we do have helpers
checking pud_trans_huge().  We should never find that return true.  The
only expected pte bit combination is _PAGE_PTE | _PAGE_DEVMAP.

Some of the helpers are never expected to get called on hash translation
and hence is marked to call BUG() in such a case.

Link: https://lkml.kernel.org/r/20230724190759.483013-10-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V
2023-07-25 00:37:55 +05:30
committed by Andrew Morton
parent 104c49d5b6
commit 27af67f356
10 changed files with 323 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/trace/events/thp.h
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@@ -30,6 +30,11 @@ DEFINE_EVENT(hugepage_set, hugepage_set_pmd,
TP_ARGS(addr, pmd)
);
DEFINE_EVENT(hugepage_set, hugepage_set_pud,
TP_PROTO(unsigned long addr, unsigned long pud),
TP_ARGS(addr, pud)
);
DECLARE_EVENT_CLASS(hugepage_update,
TP_PROTO(unsigned long addr, unsigned long pte, unsigned long clr, unsigned long set),
@@ -57,6 +62,11 @@ DEFINE_EVENT(hugepage_update, hugepage_update_pmd,
TP_ARGS(addr, pmd, clr, set)
);
DEFINE_EVENT(hugepage_update, hugepage_update_pud,
TP_PROTO(unsigned long addr, unsigned long pud, unsigned long clr, unsigned long set),
TP_ARGS(addr, pud, clr, set)
);
DECLARE_EVENT_CLASS(migration_pmd,
TP_PROTO(unsigned long addr, unsigned long pmd),