arch/powerpc/include/asm/nohash/64/pgalloc.h

   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
  14 struct vmemmap_backing {
  15         struct vmemmap_backing *list;
  16         unsigned long phys;
  17         unsigned long virt_addr;
  18 };
  19 extern struct vmemmap_backing *vmemmap_list;
  20
  21 /*
  22  * Functions that deal with pagetables that could be at any level of
  23  * the table need to be passed an "index_size" so they know how to
  24  * handle allocation.  For PTE pages (which are linked to a struct
  25  * page for now, and drawn from the main get_free_pages() pool), the
  26  * allocation size will be (2^index_size * sizeof(pointer)) and
  27  * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
  28  *
  29  * The maximum index size needs to be big enough to allow any
  30  * pagetable sizes we need, but small enough to fit in the low bits of
  31  * any page table pointer.  In other words all pagetables, even tiny
  32  * ones, must be aligned to allow at least enough low 0 bits to
  33  * contain this value.  This value is also used as a mask, so it must
  34  * be one less than a power of two.
  35  */
  36 #define MAX_PGTABLE_INDEX_SIZE  0xf
  37
  38 extern struct kmem_cache *pgtable_cache[];
  39 #define PGT_CACHE(shift) ({                             \
  40                         BUG_ON(!(shift));               \
  41                         pgtable_cache[(shift) - 1];     \
  42                 })
  43
  44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  45 {
  46         return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
  47 }
  48
  49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  50 {
  51         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  52 }
  53
  54 #ifndef CONFIG_PPC_64K_PAGES
  55
  56 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, __pgtable_ptr_val(PUD))
  57
  58 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  59 {
  60         return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
  61                                 GFP_KERNEL|__GFP_REPEAT);
  62 }
  63
  64 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  65 {
  66         kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
  67 }
  68
  69 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  70 {
  71         pud_set(pud, __pgtable_ptr_val(pmd));
  72 }
  73
  74 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  75                                        pte_t *pte)
  76 {
  77         pmd_set(pmd, __pgtable_ptr_val(pte));
  78 }
  79
  80 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  81                                 pgtable_t pte_page)
  82 {
  83         pmd_set(pmd, __pgtable_ptr_val(page_address(pte_page)));
  84 }
  85
  86 #define pmd_pgtable(pmd) pmd_page(pmd)
  87
  88 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  89                                           unsigned long address)
  90 {
  91         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  92 }
  93
  94 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  95                                       unsigned long address)
  96 {
  97         struct page *page;
  98         pte_t *pte;
  99
 100         pte = pte_alloc_one_kernel(mm, address);
 101         if (!pte)
 102                 return NULL;
 103         page = virt_to_page(pte);
 104         if (!pgtable_page_ctor(page)) {
 105                 __free_page(page);
 106                 return NULL;
 107         }
 108         return page;
 109 }
 110
 111 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 112 {
 113         free_page((unsigned long)pte);
 114 }
 115
 116 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 117 {
 118         pgtable_page_dtor(ptepage);
 119         __free_page(ptepage);
 120 }
 121
 122 static inline void pgtable_free(void *table, unsigned index_size)
 123 {
 124         if (!index_size)
 125                 free_page((unsigned long)table);
 126         else {
 127                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
 128                 kmem_cache_free(PGT_CACHE(index_size), table);
 129         }
 130 }
 131
 132 #ifdef CONFIG_SMP
 133 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 134                                     void *table, int shift)
 135 {
 136         unsigned long pgf = (unsigned long)table;
 137         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
 138         pgf |= shift;
 139         tlb_remove_table(tlb, (void *)pgf);
 140 }
 141
 142 static inline void __tlb_remove_table(void *_table)
 143 {
 144         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
 145         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
 146
 147         pgtable_free(table, shift);
 148 }
 149 #else /* !CONFIG_SMP */
 150 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 151                                     void *table, int shift)
 152 {
 153         pgtable_free(table, shift);
 154 }
 155 #endif /* CONFIG_SMP */
 156
 157 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 158                                   unsigned long address)
 159 {
 160         tlb_flush_pgtable(tlb, address);
 161         pgtable_page_dtor(table);
 162         pgtable_free_tlb(tlb, page_address(table), 0);
 163 }
 164
 165 #else /* if CONFIG_PPC_64K_PAGES */
 166
 167 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
 168 extern void page_table_free(struct mm_struct *, unsigned long *, int);
 169 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
 170 #ifdef CONFIG_SMP
 171 extern void __tlb_remove_table(void *_table);
 172 #endif
 173
 174 #ifndef __PAGETABLE_PUD_FOLDED
 175 /* book3s 64 is 4 level page table */
 176 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
 177 {
 178         pgd_set(pgd, __pgtable_ptr_val(pud));
 179 }
 180
 181 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 182 {
 183         return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
 184                                 GFP_KERNEL|__GFP_REPEAT);
 185 }
 186
 187 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 188 {
 189         kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
 190 }
 191 #endif
 192
 193 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 194 {
 195         pud_set(pud, __pgtable_ptr_val(pmd));
 196 }
 197
 198 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 199                                        pte_t *pte)
 200 {
 201         pmd_set(pmd, __pgtable_ptr_val(pte));
 202 }
 203
 204 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 205                                 pgtable_t pte_page)
 206 {
 207         pmd_set(pmd, __pgtable_ptr_val(pte_page));
 208 }
 209
 210 static inline pgtable_t pmd_pgtable(pmd_t pmd)
 211 {
 212         return (pgtable_t)pmd_page_vaddr(pmd);
 213 }
 214
 215 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 216                                           unsigned long address)
 217 {
 218         return (pte_t *)page_table_alloc(mm, address, 1);
 219 }
 220
 221 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 222                                         unsigned long address)
 223 {
 224         return (pgtable_t)page_table_alloc(mm, address, 0);
 225 }
 226
 227 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 228 {
 229         page_table_free(mm, (unsigned long *)pte, 1);
 230 }
 231
 232 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 233 {
 234         page_table_free(mm, (unsigned long *)ptepage, 0);
 235 }
 236
 237 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 238                                   unsigned long address)
 239 {
 240         tlb_flush_pgtable(tlb, address);
 241         pgtable_free_tlb(tlb, table, 0);
 242 }
 243 #endif /* CONFIG_PPC_64K_PAGES */
 244
 245 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 246 {
 247         return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
 248                                 GFP_KERNEL|__GFP_REPEAT);
 249 }
 250
 251 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 252 {
 253         kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
 254 }
 255
 256 #define __pmd_free_tlb(tlb, pmd, addr)                \
 257         pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
 258 #ifndef __PAGETABLE_PUD_FOLDED
 259 #define __pud_free_tlb(tlb, pud, addr)                \
 260         pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
 261
 262 #endif /* __PAGETABLE_PUD_FOLDED */
 263
 264 #define check_pgt_cache()       do { } while (0)
 265
 266 #endif /* _ASM_POWERPC_PGALLOC_64_H */