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 #define H_PTE_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x   4KB =   2MB
   6 #define H_PMD_INDEX_SIZE  7  // size: 8B << 7 = 1KB, maps: 2^7 x   2MB = 256MB
   7 #define H_PUD_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB
   8 #define H_PGD_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x 128GB =  64TB
   9
  10 /*
  11  * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB
  12  * Hence also limit max EA bits to 64TB.
  13  */
  14 #define MAX_EA_BITS_PER_CONTEXT         46
  15
  16 #define REGION_SHIFT            (MAX_EA_BITS_PER_CONTEXT - 2)
  17
  18 /*
  19  * Our page table limit us to 64TB. Hence for the kernel mapping,
  20  * each MAP area is limited to 16 TB.
  21  * The four map areas are:  linear mapping, vmap, IO and vmemmap
  22  */
  23 #define H_KERN_MAP_SIZE         (ASM_CONST(1) << REGION_SHIFT)
  24
  25 /*
  26  * Define the address range of the kernel non-linear virtual area
  27  * 16TB
  28  */
  29 #define H_KERN_VIRT_START       ASM_CONST(0xc000100000000000)
  30
  31 #ifndef __ASSEMBLY__
  32 #define H_PTE_TABLE_SIZE        (sizeof(pte_t) << H_PTE_INDEX_SIZE)
  33 #define H_PMD_TABLE_SIZE        (sizeof(pmd_t) << H_PMD_INDEX_SIZE)
  34 #define H_PUD_TABLE_SIZE        (sizeof(pud_t) << H_PUD_INDEX_SIZE)
  35 #define H_PGD_TABLE_SIZE        (sizeof(pgd_t) << H_PGD_INDEX_SIZE)
  36
  37 #define H_PAGE_F_GIX_SHIFT      53
  38 #define H_PAGE_F_SECOND _RPAGE_RPN44    /* HPTE is in 2ndary HPTEG */
  39 #define H_PAGE_F_GIX    (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41)
  40 #define H_PAGE_BUSY     _RPAGE_RSV1     /* software: PTE & hash are busy */
  41 #define H_PAGE_HASHPTE  _RPAGE_RSV2     /* software: PTE & hash are busy */
  42
  43 /* PTE flags to conserve for HPTE identification */
  44 #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
  45                          H_PAGE_F_SECOND | H_PAGE_F_GIX)
  46 /*
  47  * Not supported by 4k linux page size
  48  */
  49 #define H_PAGE_4K_PFN   0x0
  50 #define H_PAGE_THP_HUGE 0x0
  51 #define H_PAGE_COMBO    0x0
  52
  53 /* 8 bytes per each pte entry */
  54 #define H_PTE_FRAG_SIZE_SHIFT  (H_PTE_INDEX_SIZE + 3)
  55 #define H_PTE_FRAG_NR   (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT)
  56 #define H_PMD_FRAG_SIZE_SHIFT  (H_PMD_INDEX_SIZE + 3)
  57 #define H_PMD_FRAG_NR   (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT)
  58
  59 /* memory key bits, only 8 keys supported */
  60 #define H_PTE_PKEY_BIT0 0
  61 #define H_PTE_PKEY_BIT1 0
  62 #define H_PTE_PKEY_BIT2 _RPAGE_RSV3
  63 #define H_PTE_PKEY_BIT3 _RPAGE_RSV4
  64 #define H_PTE_PKEY_BIT4 _RPAGE_RSV5
  65
  66 /*
  67  * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
  68  */
  69 #define remap_4k_pfn(vma, addr, pfn, prot)      \
  70         remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
  71
  72 #ifdef CONFIG_HUGETLB_PAGE
  73 static inline int hash__hugepd_ok(hugepd_t hpd)
  74 {
  75         unsigned long hpdval = hpd_val(hpd);
  76         /*
  77          * if it is not a pte and have hugepd shift mask
  78          * set, then it is a hugepd directory pointer
  79          */
  80         if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) &&
  81             ((hpdval & HUGEPD_SHIFT_MASK) != 0))
  82                 return true;
  83         return false;
  84 }
  85 #endif
  86
  87 /*
  88  * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just
  89  * a matter of returning the PTE bits that need to be modified. On 64K PTE,
  90  * things are a little more involved and hence needs many more parameters to
  91  * accomplish the same. However we want to abstract this out from the caller by
  92  * keeping the prototype consistent across the two formats.
  93  */
  94 static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte,
  95                                          unsigned int subpg_index, unsigned long hidx,
  96                                          int offset)
  97 {
  98         return (hidx << H_PAGE_F_GIX_SHIFT) &
  99                 (H_PAGE_F_SECOND | H_PAGE_F_GIX);
 100 }
 101
 102 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 103
 104 static inline char *get_hpte_slot_array(pmd_t *pmdp)
 105 {
 106         BUG();
 107         return NULL;
 108 }
 109
 110 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
 111 {
 112         BUG();
 113         return 0;
 114 }
 115
 116 static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
 117                                            int index)
 118 {
 119         BUG();
 120         return 0;
 121 }
 122
 123 static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
 124                                         unsigned int index, unsigned int hidx)
 125 {
 126         BUG();
 127 }
 128
 129 static inline int hash__pmd_trans_huge(pmd_t pmd)
 130 {
 131         return 0;
 132 }
 133
 134 static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 135 {
 136         BUG();
 137         return 0;
 138 }
 139
 140 static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
 141 {
 142         BUG();
 143         return pmd;
 144 }
 145
 146 extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
 147                                            unsigned long addr, pmd_t *pmdp,
 148                                            unsigned long clr, unsigned long set);
 149 extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
 150                                    unsigned long address, pmd_t *pmdp);
 151 extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 152                                          pgtable_t pgtable);
 153 extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 154 extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
 155                                        unsigned long addr, pmd_t *pmdp);
 156 extern int hash__has_transparent_hugepage(void);
 157 #endif
 158
 159 #endif /* !__ASSEMBLY__ */
 160
 161 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */