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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H
3 #define _ASM_POWERPC_BOOK3S_32_PGALLOC_H
5 #include <linux/threads.h>
6 #include <linux/slab.h>
9 * Functions that deal with pagetables that could be at any level of
10 * the table need to be passed an "index_size" so they know how to
11 * handle allocation. For PTE pages (which are linked to a struct
12 * page for now, and drawn from the main get_free_pages() pool), the
13 * allocation size will be (2^index_size * sizeof(pointer)) and
14 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
16 * The maximum index size needs to be big enough to allow any
17 * pagetable sizes we need, but small enough to fit in the low bits of
18 * any page table pointer. In other words all pagetables, even tiny
19 * ones, must be aligned to allow at least enough low 0 bits to
20 * contain this value. This value is also used as a mask, so it must
21 * be one less than a power of two.
23 #define MAX_PGTABLE_INDEX_SIZE 0xf
25 extern void __bad_pte(pmd_t
*pmd
);
27 extern struct kmem_cache
*pgtable_cache
[];
28 #define PGT_CACHE(shift) pgtable_cache[shift]
30 static inline pgd_t
*pgd_alloc(struct mm_struct
*mm
)
32 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE
),
33 pgtable_gfp_flags(mm
, GFP_KERNEL
));
36 static inline void pgd_free(struct mm_struct
*mm
, pgd_t
*pgd
)
38 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE
), pgd
);
42 * We don't have any real pmd's, and this code never triggers because
43 * the pgd will always be present..
45 /* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */
46 #define pmd_free(mm, x) do { } while (0)
47 #define __pmd_free_tlb(tlb,x,a) do { } while (0)
48 /* #define pgd_populate(mm, pmd, pte) BUG() */
50 static inline void pmd_populate_kernel(struct mm_struct
*mm
, pmd_t
*pmdp
,
53 *pmdp
= __pmd(__pa(pte
) | _PMD_PRESENT
);
56 static inline void pmd_populate(struct mm_struct
*mm
, pmd_t
*pmdp
,
59 *pmdp
= __pmd(__pa(pte_page
) | _PMD_PRESENT
);
62 #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
64 extern pte_t
*pte_alloc_one_kernel(struct mm_struct
*mm
, unsigned long addr
);
65 extern pgtable_t
pte_alloc_one(struct mm_struct
*mm
, unsigned long addr
);
66 void pte_frag_destroy(void *pte_frag
);
67 pte_t
*pte_fragment_alloc(struct mm_struct
*mm
, unsigned long vmaddr
, int kernel
);
68 void pte_fragment_free(unsigned long *table
, int kernel
);
70 static inline void pte_free_kernel(struct mm_struct
*mm
, pte_t
*pte
)
72 pte_fragment_free((unsigned long *)pte
, 1);
75 static inline void pte_free(struct mm_struct
*mm
, pgtable_t ptepage
)
77 pte_fragment_free((unsigned long *)ptepage
, 0);
80 static inline void pgtable_free(void *table
, unsigned index_size
)
83 pte_fragment_free((unsigned long *)table
, 0);
85 BUG_ON(index_size
> MAX_PGTABLE_INDEX_SIZE
);
86 kmem_cache_free(PGT_CACHE(index_size
), table
);
90 #define check_pgt_cache() do { } while (0)
91 #define get_hugepd_cache_index(x) (x)
94 static inline void pgtable_free_tlb(struct mmu_gather
*tlb
,
95 void *table
, int shift
)
97 unsigned long pgf
= (unsigned long)table
;
98 BUG_ON(shift
> MAX_PGTABLE_INDEX_SIZE
);
100 tlb_remove_table(tlb
, (void *)pgf
);
103 static inline void __tlb_remove_table(void *_table
)
105 void *table
= (void *)((unsigned long)_table
& ~MAX_PGTABLE_INDEX_SIZE
);
106 unsigned shift
= (unsigned long)_table
& MAX_PGTABLE_INDEX_SIZE
;
108 pgtable_free(table
, shift
);
111 static inline void pgtable_free_tlb(struct mmu_gather
*tlb
,
112 void *table
, int shift
)
114 pgtable_free(table
, shift
);
118 static inline void __pte_free_tlb(struct mmu_gather
*tlb
, pgtable_t table
,
119 unsigned long address
)
121 pgtable_free_tlb(tlb
, table
, 0);
123 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */