LXR linux/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
  12struct vmemmap_backing {
  13        struct vmemmap_backing *list;
  14        unsigned long phys;
  15        unsigned long virt_addr;
  16};
  17extern struct vmemmap_backing *vmemmap_list;
  18
  19extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
  20extern void pmd_fragment_free(unsigned long *);
  21extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
  22#ifdef CONFIG_SMP
  23extern void __tlb_remove_table(void *_table);
  24#endif
  25void pte_frag_destroy(void *pte_frag);
  26
  27static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
  28{
  29#ifdef CONFIG_PPC_64K_PAGES
  30        return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
  31#else
  32        struct page *page;
  33        page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
  34                                4);
  35        if (!page)
  36                return NULL;
  37        return (pgd_t *) page_address(page);
  38#endif
  39}
  40
  41static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
  42{
  43#ifdef CONFIG_PPC_64K_PAGES
  44        free_page((unsigned long)pgd);
  45#else
  46        free_pages((unsigned long)pgd, 4);
  47#endif
  48}
  49
  50static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  51{
  52        pgd_t *pgd;
  53
  54        if (radix_enabled())
  55                return radix__pgd_alloc(mm);
  56
  57        pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
  58                               pgtable_gfp_flags(mm, GFP_KERNEL));
  59        if (unlikely(!pgd))
  60                return pgd;
  61
  62        /*
  63         * Don't scan the PGD for pointers, it contains references to PUDs but
  64         * those references are not full pointers and so can't be recognised by
  65         * kmemleak.
  66         */
  67        kmemleak_no_scan(pgd);
  68
  69        /*
  70         * With hugetlb, we don't clear the second half of the page table.
  71         * If we share the same slab cache with the pmd or pud level table,
  72         * we need to make sure we zero out the full table on alloc.
  73         * With 4K we don't store slot in the second half. Hence we don't
  74         * need to do this for 4k.
  75         */
  76#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
  77        (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
  78        memset(pgd, 0, PGD_TABLE_SIZE);
  79#endif
  80        return pgd;
  81}
  82
  83static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  84{
  85        if (radix_enabled())
  86                return radix__pgd_free(mm, pgd);
  87        kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  88}
  89
  90static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  91{
  92        *pgd =  __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
  93}
  94
  95static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  96{
  97        pud_t *pud;
  98
  99        pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
 100                               pgtable_gfp_flags(mm, GFP_KERNEL));
 101        /*
 102         * Tell kmemleak to ignore the PUD, that means don't scan it for
 103         * pointers and don't consider it a leak. PUDs are typically only
 104         * referred to by their PGD, but kmemleak is not able to recognise those
 105         * as pointers, leading to false leak reports.
 106         */
 107        kmemleak_ignore(pud);
 108
 109        return pud;
 110}
 111
 112static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 113{
 114        kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
 115}
 116
 117static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 118{
 119        *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
 120}
 121
 122static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 123                                  unsigned long address)
 124{
 125        /*
 126         * By now all the pud entries should be none entries. So go
 127         * ahead and flush the page walk cache
 128         */
 129        flush_tlb_pgtable(tlb, address);
 130        pgtable_free_tlb(tlb, pud, PUD_INDEX);
 131}
 132
 133static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 134{
 135        return pmd_fragment_alloc(mm, addr);
 136}
 137
 138static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 139{
 140        pmd_fragment_free((unsigned long *)pmd);
 141}
 142
 143static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 144                                  unsigned long address)
 145{
 146        /*
 147         * By now all the pud entries should be none entries. So go
 148         * ahead and flush the page walk cache
 149         */
 150        flush_tlb_pgtable(tlb, address);
 151        return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
 152}
 153
 154static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 155                                       pte_t *pte)
 156{
 157        *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
 158}
 159
 160static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 161                                pgtable_t pte_page)
 162{
 163        *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
 164}
 165
 166static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 167                                  unsigned long address)
 168{
 169        /*
 170         * By now all the pud entries should be none entries. So go
 171         * ahead and flush the page walk cache
 172         */
 173        flush_tlb_pgtable(tlb, address);
 174        pgtable_free_tlb(tlb, table, PTE_INDEX);
 175}
 176
 177extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
 178static inline void update_page_count(int psize, long count)
 179{
 180        if (IS_ENABLED(CONFIG_PROC_FS))
 181                atomic_long_add(count, &direct_pages_count[psize]);
 182}
 183
 184#endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */
 185