1#ifndef _ASM_POWERPC_PGALLOC_64_H 2#define _ASM_POWERPC_PGALLOC_64_H 3/* 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10#include <linux/slab.h> 11#include <linux/cpumask.h> 12#include <linux/percpu.h> 13 14struct vmemmap_backing { 15 struct vmemmap_backing *list; 16 unsigned long phys; 17 unsigned long virt_addr; 18}; 19 20/* 21 * Functions that deal with pagetables that could be at any level of 22 * the table need to be passed an "index_size" so they know how to 23 * handle allocation. For PTE pages (which are linked to a struct 24 * page for now, and drawn from the main get_free_pages() pool), the 25 * allocation size will be (2^index_size * sizeof(pointer)) and 26 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size). 27 * 28 * The maximum index size needs to be big enough to allow any 29 * pagetable sizes we need, but small enough to fit in the low bits of 30 * any page table pointer. In other words all pagetables, even tiny 31 * ones, must be aligned to allow at least enough low 0 bits to 32 * contain this value. This value is also used as a mask, so it must 33 * be one less than a power of two. 34 */ 35#define MAX_PGTABLE_INDEX_SIZE 0xf 36 37extern struct kmem_cache *pgtable_cache[]; 38#define PGT_CACHE(shift) (pgtable_cache[(shift)-1]) 39 40static inline pgd_t *pgd_alloc(struct mm_struct *mm) 41{ 42 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); 43} 44 45static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 46{ 47 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); 48} 49 50#ifndef CONFIG_PPC_64K_PAGES 51 52#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD) 53 54static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 55{ 56 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE), 57 GFP_KERNEL|__GFP_REPEAT); 58} 59 60static inline void pud_free(struct mm_struct *mm, pud_t *pud) 61{ 62 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); 63} 64 65static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 66{ 67 pud_set(pud, (unsigned long)pmd); 68} 69 70#define pmd_populate(mm, pmd, pte_page) \ 71 pmd_populate_kernel(mm, pmd, page_address(pte_page)) 72#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte)) 73#define pmd_pgtable(pmd) pmd_page(pmd) 74 75 76#else /* CONFIG_PPC_64K_PAGES */ 77 78#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) 79 80static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 81 pte_t *pte) 82{ 83 pmd_set(pmd, (unsigned long)pte); 84} 85 86#define pmd_populate(mm, pmd, pte_page) \ 87 pmd_populate_kernel(mm, pmd, page_address(pte_page)) 88#define pmd_pgtable(pmd) pmd_page(pmd) 89 90#endif /* CONFIG_PPC_64K_PAGES */ 91 92static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 93{ 94 return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE), 95 GFP_KERNEL|__GFP_REPEAT); 96} 97 98static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 99{ 100 kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd); 101} 102 103static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 104 unsigned long address) 105{ 106 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO); 107} 108 109static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 110 unsigned long address) 111{ 112 struct page *page; 113 pte_t *pte; 114 115 pte = pte_alloc_one_kernel(mm, address); 116 if (!pte) 117 return NULL; 118 page = virt_to_page(pte); 119 pgtable_page_ctor(page); 120 return page; 121} 122 123static inline void pgtable_free(void *table, unsigned index_size) 124{ 125 if (!index_size) 126 free_page((unsigned long)table); 127 else { 128 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); 129 kmem_cache_free(PGT_CACHE(index_size), table); 130 } 131} 132 133#define __pmd_free_tlb(tlb, pmd, addr) \ 134 pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE) 135#ifndef CONFIG_PPC_64K_PAGES 136#define __pud_free_tlb(tlb, pud, addr) \ 137 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) 138 139#endif /* CONFIG_PPC_64K_PAGES */ 140 141#define check_pgt_cache() do { } while (0) 142 143#endif /* _ASM_POWERPC_PGALLOC_64_H */ 144