arch/powerpc/include/asm/book3s/64/pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
   3 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H
   4 /*
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/cpumask.h>
   9 #include <linux/kmemleak.h>
  10 #include <linux/percpu.h>
  11
  12 struct vmemmap_backing {
  13         struct vmemmap_backing *list;
  14         unsigned long phys;
  15         unsigned long virt_addr;
  16 };
  17 extern struct vmemmap_backing *vmemmap_list;
  18
  19 extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
  20 extern void pmd_fragment_free(unsigned long *);
  21 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
  22 extern void __tlb_remove_table(void *_table);
  23 void pte_frag_destroy(void *pte_frag);
  24
  25 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
  26 {
  27 #ifdef CONFIG_PPC_64K_PAGES
  28         return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
  29 #else
  30         struct page *page;
  31         page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
  32                                 4);
  33         if (!page)
  34                 return NULL;
  35         return (pgd_t *) page_address(page);
  36 #endif
  37 }
  38
  39 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
  40 {
  41 #ifdef CONFIG_PPC_64K_PAGES
  42         free_page((unsigned long)pgd);
  43 #else
  44         free_pages((unsigned long)pgd, 4);
  45 #endif
  46 }
  47
  48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  49 {
  50         pgd_t *pgd;
  51
  52         if (radix_enabled())
  53                 return radix__pgd_alloc(mm);
  54
  55         pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
  56                                pgtable_gfp_flags(mm, GFP_KERNEL));
  57         if (unlikely(!pgd))
  58                 return pgd;
  59
  60         /*
  61          * Don't scan the PGD for pointers, it contains references to PUDs but
  62          * those references are not full pointers and so can't be recognised by
  63          * kmemleak.
  64          */
  65         kmemleak_no_scan(pgd);
  66
  67         /*
  68          * With hugetlb, we don't clear the second half of the page table.
  69          * If we share the same slab cache with the pmd or pud level table,
  70          * we need to make sure we zero out the full table on alloc.
  71          * With 4K we don't store slot in the second half. Hence we don't
  72          * need to do this for 4k.
  73          */
  74 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
  75         (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
  76         memset(pgd, 0, PGD_TABLE_SIZE);
  77 #endif
  78         return pgd;
  79 }
  80
  81 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  82 {
  83         if (radix_enabled())
  84                 return radix__pgd_free(mm, pgd);
  85         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  86 }
  87
  88 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  89 {
  90         *pgd =  __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
  91 }
  92
  93 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  94 {
  95         pud_t *pud;
  96
  97         pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
  98                                pgtable_gfp_flags(mm, GFP_KERNEL));
  99         /*
 100          * Tell kmemleak to ignore the PUD, that means don't scan it for
 101          * pointers and don't consider it a leak. PUDs are typically only
 102          * referred to by their PGD, but kmemleak is not able to recognise those
 103          * as pointers, leading to false leak reports.
 104          */
 105         kmemleak_ignore(pud);
 106
 107         return pud;
 108 }
 109
 110 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 111 {
 112         kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
 113 }
 114
 115 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 116 {
 117         *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
 118 }
 119
 120 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 121                                   unsigned long address)
 122 {
 123         pgtable_free_tlb(tlb, pud, PUD_INDEX);
 124 }
 125
 126 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 127 {
 128         return pmd_fragment_alloc(mm, addr);
 129 }
 130
 131 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 132 {
 133         pmd_fragment_free((unsigned long *)pmd);
 134 }
 135
 136 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 137                                   unsigned long address)
 138 {
 139         return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
 140 }
 141
 142 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 143                                        pte_t *pte)
 144 {
 145         *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
 146 }
 147
 148 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 149                                 pgtable_t pte_page)
 150 {
 151         *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
 152 }
 153
 154 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 155                                   unsigned long address)
 156 {
 157         pgtable_free_tlb(tlb, table, PTE_INDEX);
 158 }
 159
 160 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
 161 static inline void update_page_count(int psize, long count)
 162 {
 163         if (IS_ENABLED(CONFIG_PROC_FS))
 164                 atomic_long_add(count, &direct_pages_count[psize]);
 165 }
 166
 167 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */