linux/arch/powerpc/include/asm/pgalloc.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_PGALLOC_H
   3#define _ASM_POWERPC_PGALLOC_H
   4
   5#include <linux/mm.h>
   6
   7#ifndef MODULE
   8static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
   9{
  10        if (unlikely(mm == &init_mm))
  11                return gfp;
  12        return gfp | __GFP_ACCOUNT;
  13}
  14#else /* !MODULE */
  15static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
  16{
  17        return gfp | __GFP_ACCOUNT;
  18}
  19#endif /* MODULE */
  20
  21#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
  22
  23pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel);
  24
  25static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  26{
  27        return (pte_t *)pte_fragment_alloc(mm, 1);
  28}
  29
  30static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  31{
  32        return (pgtable_t)pte_fragment_alloc(mm, 0);
  33}
  34
  35void pte_frag_destroy(void *pte_frag);
  36void pte_fragment_free(unsigned long *table, int kernel);
  37
  38static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  39{
  40        pte_fragment_free((unsigned long *)pte, 1);
  41}
  42
  43static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
  44{
  45        pte_fragment_free((unsigned long *)ptepage, 0);
  46}
  47
  48/*
  49 * Functions that deal with pagetables that could be at any level of
  50 * the table need to be passed an "index_size" so they know how to
  51 * handle allocation.  For PTE pages, the allocation size will be
  52 * (2^index_size * sizeof(pointer)) and allocations are drawn from
  53 * the kmem_cache in PGT_CACHE(index_size).
  54 *
  55 * The maximum index size needs to be big enough to allow any
  56 * pagetable sizes we need, but small enough to fit in the low bits of
  57 * any page table pointer.  In other words all pagetables, even tiny
  58 * ones, must be aligned to allow at least enough low 0 bits to
  59 * contain this value.  This value is also used as a mask, so it must
  60 * be one less than a power of two.
  61 */
  62#define MAX_PGTABLE_INDEX_SIZE  0xf
  63
  64extern struct kmem_cache *pgtable_cache[];
  65#define PGT_CACHE(shift) pgtable_cache[shift]
  66
  67#ifdef CONFIG_PPC_BOOK3S
  68#include <asm/book3s/pgalloc.h>
  69#else
  70#include <asm/nohash/pgalloc.h>
  71#endif
  72
  73static inline pgtable_t pmd_pgtable(pmd_t pmd)
  74{
  75        return (pgtable_t)pmd_page_vaddr(pmd);
  76}
  77
  78#endif /* _ASM_POWERPC_PGALLOC_H */
  79