LXR linux/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
  17/*
  18 * Our page table limit us to 64TB. For 64TB physical memory, we only need 64GB
  19 * of vmemmap space. To better support sparse memory layout, we use 61TB
  20 * linear map range, 1TB of vmalloc, 1TB of I/O and 1TB of vmememmap.
  21 */
  22#define REGION_SHIFT            (40)
  23#define H_KERN_MAP_SIZE         (ASM_CONST(1) << REGION_SHIFT)
  24
  25/*
  26 * Limits the linear mapping range
  27 */
  28#define H_MAX_PHYSMEM_BITS      46
  29
  30/*
  31 * Define the address range of the kernel non-linear virtual area (61TB)
  32 */
  33#define H_KERN_VIRT_START       ASM_CONST(0xc0003d0000000000)
  34
  35#ifndef __ASSEMBLY__
  36#define H_PTE_TABLE_SIZE        (sizeof(pte_t) << H_PTE_INDEX_SIZE)
  37#define H_PMD_TABLE_SIZE        (sizeof(pmd_t) << H_PMD_INDEX_SIZE)
  38#define H_PUD_TABLE_SIZE        (sizeof(pud_t) << H_PUD_INDEX_SIZE)
  39#define H_PGD_TABLE_SIZE        (sizeof(pgd_t) << H_PGD_INDEX_SIZE)
  40
  41#define H_PAGE_F_GIX_SHIFT      _PAGE_PA_MAX
  42#define H_PAGE_F_SECOND         _RPAGE_PKEY_BIT0 /* HPTE is in 2ndary HPTEG */
  43#define H_PAGE_F_GIX            (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41)
  44#define H_PAGE_BUSY             _RPAGE_RSV1
  45#define H_PAGE_HASHPTE          _RPAGE_PKEY_BIT4
  46
  47/* PTE flags to conserve for HPTE identification */
  48#define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
  49                         H_PAGE_F_SECOND | H_PAGE_F_GIX)
  50/*
  51 * Not supported by 4k linux page size
  52 */
  53#define H_PAGE_4K_PFN   0x0
  54#define H_PAGE_THP_HUGE 0x0
  55#define H_PAGE_COMBO    0x0
  56
  57/* 8 bytes per each pte entry */
  58#define H_PTE_FRAG_SIZE_SHIFT  (H_PTE_INDEX_SIZE + 3)
  59#define H_PTE_FRAG_NR   (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT)
  60#define H_PMD_FRAG_SIZE_SHIFT  (H_PMD_INDEX_SIZE + 3)
  61#define H_PMD_FRAG_NR   (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT)
  62
  63/* memory key bits, only 8 keys supported */
  64#define H_PTE_PKEY_BIT4 0
  65#define H_PTE_PKEY_BIT3 0
  66#define H_PTE_PKEY_BIT2 _RPAGE_PKEY_BIT3
  67#define H_PTE_PKEY_BIT1 _RPAGE_PKEY_BIT2
  68#define H_PTE_PKEY_BIT0 _RPAGE_PKEY_BIT1
  69
  70
  71/*
  72 * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
  73 */
  74#define remap_4k_pfn(vma, addr, pfn, prot)      \
  75        remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
  76
  77#ifdef CONFIG_HUGETLB_PAGE
  78static inline int hash__hugepd_ok(hugepd_t hpd)
  79{
  80        unsigned long hpdval = hpd_val(hpd);
  81        /*
  82         * if it is not a pte and have hugepd shift mask
  83         * set, then it is a hugepd directory pointer
  84         */
  85        if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) &&
  86            ((hpdval & HUGEPD_SHIFT_MASK) != 0))
  87                return true;
  88        return false;
  89}
  90#endif
  91
  92/*
  93 * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just
  94 * a matter of returning the PTE bits that need to be modified. On 64K PTE,
  95 * things are a little more involved and hence needs many more parameters to
  96 * accomplish the same. However we want to abstract this out from the caller by
  97 * keeping the prototype consistent across the two formats.
  98 */
  99static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte,
 100                                         unsigned int subpg_index, unsigned long hidx,
 101                                         int offset)
 102{
 103        return (hidx << H_PAGE_F_GIX_SHIFT) &
 104                (H_PAGE_F_SECOND | H_PAGE_F_GIX);
 105}
 106
 107#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 108
 109static inline char *get_hpte_slot_array(pmd_t *pmdp)
 110{
 111        BUG();
 112        return NULL;
 113}
 114
 115static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
 116{
 117        BUG();
 118        return 0;
 119}
 120
 121static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
 122                                           int index)
 123{
 124        BUG();
 125        return 0;
 126}
 127
 128static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
 129                                        unsigned int index, unsigned int hidx)
 130{
 131        BUG();
 132}
 133
 134static inline int hash__pmd_trans_huge(pmd_t pmd)
 135{
 136        return 0;
 137}
 138
 139static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 140{
 141        BUG();
 142        return 0;
 143}
 144
 145static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
 146{
 147        BUG();
 148        return pmd;
 149}
 150
 151extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
 152                                           unsigned long addr, pmd_t *pmdp,
 153                                           unsigned long clr, unsigned long set);
 154extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
 155                                   unsigned long address, pmd_t *pmdp);
 156extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 157                                         pgtable_t pgtable);
 158extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 159extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
 160                                       unsigned long addr, pmd_t *pmdp);
 161extern int hash__has_transparent_hugepage(void);
 162#endif
 163
 164static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd)
 165{
 166        BUG();
 167        return pmd;
 168}
 169
 170#endif /* !__ASSEMBLY__ */
 171
 172#endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */
 173