arch/powerpc/include/asm/book3s/64/hash-4k.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
   3 #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
   4 /*
   5  * Entries per page directory level.  The PTE level must use a 64b record
   6  * for each page table entry.  The PMD and PGD level use a 32b record for
   7  * each entry by assuming that each entry is page aligned.
   8  */
   9 #define H_PTE_INDEX_SIZE  9
  10 #define H_PMD_INDEX_SIZE  7
  11 #define H_PUD_INDEX_SIZE  9
  12 #define H_PGD_INDEX_SIZE  9
  13
  14 #ifndef __ASSEMBLY__
  15 #define H_PTE_TABLE_SIZE        (sizeof(pte_t) << H_PTE_INDEX_SIZE)
  16 #define H_PMD_TABLE_SIZE        (sizeof(pmd_t) << H_PMD_INDEX_SIZE)
  17 #define H_PUD_TABLE_SIZE        (sizeof(pud_t) << H_PUD_INDEX_SIZE)
  18 #define H_PGD_TABLE_SIZE        (sizeof(pgd_t) << H_PGD_INDEX_SIZE)
  19
  20 #define H_PAGE_F_GIX_SHIFT      53
  21 #define H_PAGE_F_SECOND _RPAGE_RPN44    /* HPTE is in 2ndary HPTEG */
  22 #define H_PAGE_F_GIX    (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41)
  23 #define H_PAGE_BUSY     _RPAGE_RSV1     /* software: PTE & hash are busy */
  24 #define H_PAGE_HASHPTE  _RPAGE_RSV2     /* software: PTE & hash are busy */
  25
  26 /* PTE flags to conserve for HPTE identification */
  27 #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
  28                          H_PAGE_F_SECOND | H_PAGE_F_GIX)
  29 /*
  30  * Not supported by 4k linux page size
  31  */
  32 #define H_PAGE_4K_PFN   0x0
  33 #define H_PAGE_THP_HUGE 0x0
  34 #define H_PAGE_COMBO    0x0
  35 #define H_PTE_FRAG_NR   0
  36 #define H_PTE_FRAG_SIZE_SHIFT  0
  37 /*
  38  * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
  39  */
  40 #define remap_4k_pfn(vma, addr, pfn, prot)      \
  41         remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
  42
  43 #ifdef CONFIG_HUGETLB_PAGE
  44 static inline int hash__hugepd_ok(hugepd_t hpd)
  45 {
  46         unsigned long hpdval = hpd_val(hpd);
  47         /*
  48          * if it is not a pte and have hugepd shift mask
  49          * set, then it is a hugepd directory pointer
  50          */
  51         if (!(hpdval & _PAGE_PTE) &&
  52             ((hpdval & HUGEPD_SHIFT_MASK) != 0))
  53                 return true;
  54         return false;
  55 }
  56 #endif
  57
  58 /*
  59  * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just
  60  * a matter of returning the PTE bits that need to be modified. On 64K PTE,
  61  * things are a little more involved and hence needs many more parameters to
  62  * accomplish the same. However we want to abstract this out from the caller by
  63  * keeping the prototype consistent across the two formats.
  64  */
  65 static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte,
  66                                          unsigned int subpg_index, unsigned long hidx,
  67                                          int offset)
  68 {
  69         return (hidx << H_PAGE_F_GIX_SHIFT) &
  70                 (H_PAGE_F_SECOND | H_PAGE_F_GIX);
  71 }
  72
  73 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  74
  75 static inline char *get_hpte_slot_array(pmd_t *pmdp)
  76 {
  77         BUG();
  78         return NULL;
  79 }
  80
  81 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
  82 {
  83         BUG();
  84         return 0;
  85 }
  86
  87 static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
  88                                            int index)
  89 {
  90         BUG();
  91         return 0;
  92 }
  93
  94 static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
  95                                         unsigned int index, unsigned int hidx)
  96 {
  97         BUG();
  98 }
  99
 100 static inline int hash__pmd_trans_huge(pmd_t pmd)
 101 {
 102         return 0;
 103 }
 104
 105 static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 106 {
 107         BUG();
 108         return 0;
 109 }
 110
 111 static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
 112 {
 113         BUG();
 114         return pmd;
 115 }
 116
 117 extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
 118                                            unsigned long addr, pmd_t *pmdp,
 119                                            unsigned long clr, unsigned long set);
 120 extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
 121                                    unsigned long address, pmd_t *pmdp);
 122 extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 123                                          pgtable_t pgtable);
 124 extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 125 extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
 126                                        unsigned long addr, pmd_t *pmdp);
 127 extern int hash__has_transparent_hugepage(void);
 128 #endif
 129
 130 #endif /* !__ASSEMBLY__ */
 131
 132 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */