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

INCLUDED FROM

DEFINITIONS

1. radix__pgd_alloc
2. radix__pgd_free
3. pgd_alloc
4. pgd_free
5. pgd_populate
6. pud_alloc_one
7. pud_free
8. pud_populate
9. __pud_free_tlb
10. pmd_alloc_one
11. pmd_free
12. __pmd_free_tlb
13. pmd_populate_kernel
14. pmd_populate
15. __pte_free_tlb
16. update_page_count

   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         /*
 124          * By now all the pud entries should be none entries. So go
 125          * ahead and flush the page walk cache
 126          */
 127         flush_tlb_pgtable(tlb, address);
 128         pgtable_free_tlb(tlb, pud, PUD_INDEX);
 129 }
 130 
 131 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 132 {
 133         return pmd_fragment_alloc(mm, addr);
 134 }
 135 
 136 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 137 {
 138         pmd_fragment_free((unsigned long *)pmd);
 139 }
 140 
 141 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 142                                   unsigned long address)
 143 {
 144         /*
 145          * By now all the pud entries should be none entries. So go
 146          * ahead and flush the page walk cache
 147          */
 148         flush_tlb_pgtable(tlb, address);
 149         return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
 150 }
 151 
 152 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 153                                        pte_t *pte)
 154 {
 155         *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
 156 }
 157 
 158 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 159                                 pgtable_t pte_page)
 160 {
 161         *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
 162 }
 163 
 164 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 165                                   unsigned long address)
 166 {
 167         /*
 168          * By now all the pud entries should be none entries. So go
 169          * ahead and flush the page walk cache
 170          */
 171         flush_tlb_pgtable(tlb, address);
 172         pgtable_free_tlb(tlb, table, PTE_INDEX);
 173 }
 174 
 175 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
 176 static inline void update_page_count(int psize, long count)
 177 {
 178         if (IS_ENABLED(CONFIG_PROC_FS))
 179                 atomic_long_add(count, &direct_pages_count[psize]);
 180 }
 181 
 182 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */