1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H
3 #define _ASM_POWERPC_BOOK3S_32_PGALLOC_H
4
5 #include <linux/threads.h>
6 #include <linux/slab.h>
7
8 /*
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).
15 *
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.
22 */
23 #define MAX_PGTABLE_INDEX_SIZE 0xf
24
25 extern void __bad_pte(pmd_t *pmd);
26
27 extern struct kmem_cache *pgtable_cache[];
28 #define PGT_CACHE(shift) ({ \
29 BUG_ON(!(shift)); \
30 pgtable_cache[(shift) - 1]; \
31 })
32
pgd_alloc(struct mm_struct * mm)33 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
34 {
35 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
36 pgtable_gfp_flags(mm, GFP_KERNEL));
37 }
38
pgd_free(struct mm_struct * mm,pgd_t * pgd)39 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
40 {
41 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
42 }
43
44 /*
45 * We don't have any real pmd's, and this code never triggers because
46 * the pgd will always be present..
47 */
48 /* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */
49 #define pmd_free(mm, x) do { } while (0)
50 #define __pmd_free_tlb(tlb,x,a) do { } while (0)
51 /* #define pgd_populate(mm, pmd, pte) BUG() */
52
53 #ifndef CONFIG_BOOKE
54
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * pte)55 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
56 pte_t *pte)
57 {
58 *pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
59 }
60
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t pte_page)61 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
62 pgtable_t pte_page)
63 {
64 *pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT);
65 }
66
67 #define pmd_pgtable(pmd) pmd_page(pmd)
68 #else
69
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * pte)70 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
71 pte_t *pte)
72 {
73 *pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
74 }
75
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t pte_page)76 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
77 pgtable_t pte_page)
78 {
79 *pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
80 }
81
82 #define pmd_pgtable(pmd) pmd_page(pmd)
83 #endif
84
85 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
86 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
87
pte_free_kernel(struct mm_struct * mm,pte_t * pte)88 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
89 {
90 free_page((unsigned long)pte);
91 }
92
pte_free(struct mm_struct * mm,pgtable_t ptepage)93 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
94 {
95 pgtable_page_dtor(ptepage);
96 __free_page(ptepage);
97 }
98
pgtable_free(void * table,unsigned index_size)99 static inline void pgtable_free(void *table, unsigned index_size)
100 {
101 if (!index_size) {
102 pgtable_page_dtor(virt_to_page(table));
103 free_page((unsigned long)table);
104 } else {
105 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
106 kmem_cache_free(PGT_CACHE(index_size), table);
107 }
108 }
109
110 #define check_pgt_cache() do { } while (0)
111 #define get_hugepd_cache_index(x) (x)
112
113 #ifdef CONFIG_SMP
pgtable_free_tlb(struct mmu_gather * tlb,void * table,int shift)114 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
115 void *table, int shift)
116 {
117 unsigned long pgf = (unsigned long)table;
118 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
119 pgf |= shift;
120 tlb_remove_table(tlb, (void *)pgf);
121 }
122
__tlb_remove_table(void * _table)123 static inline void __tlb_remove_table(void *_table)
124 {
125 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
126 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
127
128 pgtable_free(table, shift);
129 }
130 #else
pgtable_free_tlb(struct mmu_gather * tlb,void * table,int shift)131 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
132 void *table, int shift)
133 {
134 pgtable_free(table, shift);
135 }
136 #endif
137
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t table,unsigned long address)138 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
139 unsigned long address)
140 {
141 pgtable_free_tlb(tlb, page_address(table), 0);
142 }
143 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */
144
