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powerpc/mm: Use page fragments for allocation page table at PMD level

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Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2018-04-16 16:57:23 +05:30 committed by Michael Ellerman
parent 8a6c697b99
commit 738f964555
7 changed files with 6 additions and 23 deletions
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10
arch/powerpc/include/asm/book3s/64/hash.h
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@ -23,16 +23,6 @@
H_PUD_INDEX_SIZE + H_PGD_INDEX_SIZE + PAGE_SHIFT)
#define H_PGTABLE_RANGE (ASM_CONST(1) << H_PGTABLE_EADDR_SIZE)
#if (defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)) && \
defined(CONFIG_PPC_64K_PAGES)
/*
* only with hash 64k we need to use the second half of pmd page table
* to store pointer to deposited pgtable_t
*/
#define H_PMD_CACHE_INDEX (H_PMD_INDEX_SIZE + 1)
#else
#define H_PMD_CACHE_INDEX H_PMD_INDEX_SIZE
#endif
/*
* We store the slot details in the second half of page table.
* Increase the pud level table so that hugetlb ptes can be stored

8
arch/powerpc/include/asm/book3s/64/pgalloc.h
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@ -90,8 +90,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
* need to do this for 4k.
*/
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
((H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX) || \
(H_PGD_INDEX_SIZE == H_PMD_CACHE_INDEX))
(H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
memset(pgd, 0, PGD_TABLE_SIZE);
#endif
return pgd;
@ -138,13 +137,12 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
pgtable_gfp_flags(mm, GFP_KERNEL));
return pmd_fragment_alloc(mm, addr);
}
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
pmd_fragment_free((unsigned long *)pmd);
}
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,

4
arch/powerpc/include/asm/book3s/64/pgtable.h
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@ -212,13 +212,13 @@ extern unsigned long __pte_index_size;
extern unsigned long __pmd_index_size;
extern unsigned long __pud_index_size;
extern unsigned long __pgd_index_size;
extern unsigned long __pmd_cache_index;
extern unsigned long __pud_cache_index;
#define PTE_INDEX_SIZE __pte_index_size
#define PMD_INDEX_SIZE __pmd_index_size
#define PUD_INDEX_SIZE __pud_index_size
#define PGD_INDEX_SIZE __pgd_index_size
#define PMD_CACHE_INDEX __pmd_cache_index
/* pmd table use page table fragments */
#define PMD_CACHE_INDEX 0
#define PUD_CACHE_INDEX __pud_cache_index
/*
* Because of use of pte fragments and THP, size of page table

1
arch/powerpc/mm/hash_utils_64.c
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@ -1020,7 +1020,6 @@ void __init hash__early_init_mmu(void)
__pud_index_size = H_PUD_INDEX_SIZE;
__pgd_index_size = H_PGD_INDEX_SIZE;
__pud_cache_index = H_PUD_CACHE_INDEX;
__pmd_cache_index = H_PMD_CACHE_INDEX;
__pte_table_size = H_PTE_TABLE_SIZE;
__pmd_table_size = H_PMD_TABLE_SIZE;
__pud_table_size = H_PUD_TABLE_SIZE;

3
arch/powerpc/mm/pgtable-book3s64.c
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@ -400,7 +400,7 @@ static inline void pgtable_free(void *table, int index)
pte_fragment_free(table, 0);
break;
case PMD_INDEX:
kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), table);
pmd_fragment_free(table);
break;
case PUD_INDEX:
kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), table);
@ -431,7 +431,6 @@ void __tlb_remove_table(void *_table)
#else
void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index)
{
return pgtable_free(table, index);
}
#endif

1
arch/powerpc/mm/pgtable-radix.c
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@ -617,7 +617,6 @@ void __init radix__early_init_mmu(void)
__pud_index_size = RADIX_PUD_INDEX_SIZE;
__pgd_index_size = RADIX_PGD_INDEX_SIZE;
__pud_cache_index = RADIX_PUD_INDEX_SIZE;
__pmd_cache_index = RADIX_PMD_INDEX_SIZE;
__pte_table_size = RADIX_PTE_TABLE_SIZE;
__pmd_table_size = RADIX_PMD_TABLE_SIZE;
__pud_table_size = RADIX_PUD_TABLE_SIZE;

2
arch/powerpc/mm/pgtable_64.c
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@ -72,8 +72,6 @@ unsigned long __pud_index_size;
EXPORT_SYMBOL(__pud_index_size);
unsigned long __pgd_index_size;
EXPORT_SYMBOL(__pgd_index_size);
unsigned long __pmd_cache_index;
EXPORT_SYMBOL(__pmd_cache_index);
unsigned long __pud_cache_index;
EXPORT_SYMBOL(__pud_cache_index);
unsigned long __pte_table_size;