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) pgtable_cache[shift] 29 30 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 31 { 32 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), 33 pgtable_gfp_flags(mm, GFP_KERNEL)); 34 } 35 36 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 37 { 38 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); 39 } 40 41 /* 42 * We don't have any real pmd's, and this code never triggers because 43 * the pgd will always be present.. 44 */ 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() */ 49 50 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, 51 pte_t *pte) 52 { 53 *pmdp = __pmd(__pa(pte) | _PMD_PRESENT); 54 } 55 56 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 57 pgtable_t pte_page) 58 { 59 *pmdp = __pmd(__pa(pte_page) | _PMD_PRESENT); 60 } 61 62 #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd)) 63 64 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); 65 extern pgtable_t pte_alloc_one(struct mm_struct *mm); 66 void pte_frag_destroy(void *pte_frag); 67 pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel); 68 void pte_fragment_free(unsigned long *table, int kernel); 69 70 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 71 { 72 pte_fragment_free((unsigned long *)pte, 1); 73 } 74 75 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 76 { 77 pte_fragment_free((unsigned long *)ptepage, 0); 78 } 79 80 static inline void pgtable_free(void *table, unsigned index_size) 81 { 82 if (!index_size) { 83 pte_fragment_free((unsigned long *)table, 0); 84 } else { 85 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); 86 kmem_cache_free(PGT_CACHE(index_size), table); 87 } 88 } 89 90 #define check_pgt_cache() do { } while (0) 91 #define get_hugepd_cache_index(x) (x) 92 93 #ifdef CONFIG_SMP 94 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 95 void *table, int shift) 96 { 97 unsigned long pgf = (unsigned long)table; 98 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); 99 pgf |= shift; 100 tlb_remove_table(tlb, (void *)pgf); 101 } 102 103 static inline void __tlb_remove_table(void *_table) 104 { 105 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); 106 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; 107 108 pgtable_free(table, shift); 109 } 110 #else 111 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 112 void *table, int shift) 113 { 114 pgtable_free(table, shift); 115 } 116 #endif 117 118 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 119 unsigned long address) 120 { 121 pgtable_free_tlb(tlb, table, 0); 122 } 123 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */ 124