arch/powerpc/include/asm/pgalloc.h

   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
   8 static 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 */
  15 static 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
  23 pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel);
  24
  25 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  26 {
  27         return (pte_t *)pte_fragment_alloc(mm, 1);
  28 }
  29
  30 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  31 {
  32         return (pgtable_t)pte_fragment_alloc(mm, 0);
  33 }
  34
  35 void pte_frag_destroy(void *pte_frag);
  36 void pte_fragment_free(unsigned long *table, int kernel);
  37
  38 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  39 {
  40         pte_fragment_free((unsigned long *)pte, 1);
  41 }
  42
  43 static 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
  64 extern 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
  73 static 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 */