diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2023-07-25 00:37:56 +0530 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 10:12:55 -0700 |
| commit | 368a0590d954a659b16ab945328ada0cc10f93a0 (patch) | |
| tree | a32325d9fb7d55caa92482f2e29e84d82475ad5f /arch/powerpc/include/asm/pgtable.h | |
| parent | 27af67f35631ac4b61b5e4455b44c9aee8d2cc4b (diff) | |
powerpc/book3s64/vmemmap: switch radix to use a different vmemmap handling function
This is in preparation to update radix to implement vmemmap optimization
for devdax. Below are the rules w.r.t radix vmemmap mapping
1. First try to map things using PMD (2M)
2. With altmap if altmap cross-boundary check returns true, fall back to
PAGE_SIZE
3. If we can't allocate PMD_SIZE backing memory for vmemmap, fallback to
PAGE_SIZE
On removing vmemmap mapping, check if every subsection that is using the
vmemmap area is invalid. If found to be invalid, that implies we can
safely free the vmemmap area. We don't use the PAGE_UNUSED pattern used
by x86 because with 64K page size, we need to do the above check even at
the PAGE_SIZE granularity.
[aneesh.kumar@linux.ibm.com: fix section mismatch warning]
Link: https://lkml.kernel.org/r/87h6pqvu5g.fsf@linux.ibm.com
[aneesh.kumar@linux.ibm.com: fix kernel build error]
Link: https://lkml.kernel.org/r/877cqkwd20.fsf@linux.ibm.com
Link: https://lkml.kernel.org/r/20230724190759.483013-11-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>
Diffstat (limited to 'arch/powerpc/include/asm/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/pgtable.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 445a22987aa3..a4893b17705a 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -157,6 +157,12 @@ static inline pgtable_t pmd_pgtable(pmd_t pmd) return (pgtable_t)pmd_page_vaddr(pmd); } +#ifdef CONFIG_PPC64 +int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size); +bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start, + unsigned long page_size); +#endif /* CONFIG_PPC64 */ + #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_PGTABLE_H */ |