arch/powerpc/include/asm/hugetlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_HUGETLB_H
   3 #define _ASM_POWERPC_HUGETLB_H
   4
   5 #ifdef CONFIG_HUGETLB_PAGE
   6 #include <asm/page.h>
   7
   8 extern struct kmem_cache *hugepte_cache;
   9
  10 #ifdef CONFIG_PPC_BOOK3S_64
  11
  12 #include <asm/book3s/64/hugetlb.h>
  13 /*
  14  * This should work for other subarchs too. But right now we use the
  15  * new format only for 64bit book3s
  16  */
  17 static inline pte_t *hugepd_page(hugepd_t hpd)
  18 {
  19         BUG_ON(!hugepd_ok(hpd));
  20         /*
  21          * We have only four bits to encode, MMU page size
  22          */
  23         BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
  24         return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
  25 }
  26
  27 static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
  28 {
  29         return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
  30 }
  31
  32 static inline unsigned int hugepd_shift(hugepd_t hpd)
  33 {
  34         return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
  35 }
  36 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
  37                                       unsigned long vmaddr)
  38 {
  39         if (radix_enabled())
  40                 return radix__flush_hugetlb_page(vma, vmaddr);
  41 }
  42
  43 #else
  44
  45 static inline pte_t *hugepd_page(hugepd_t hpd)
  46 {
  47         BUG_ON(!hugepd_ok(hpd));
  48 #ifdef CONFIG_PPC_8xx
  49         return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
  50 #else
  51         return (pte_t *)((hpd_val(hpd) &
  52                           ~HUGEPD_SHIFT_MASK) | PD_HUGE);
  53 #endif
  54 }
  55
  56 static inline unsigned int hugepd_shift(hugepd_t hpd)
  57 {
  58 #ifdef CONFIG_PPC_8xx
  59         return ((hpd_val(hpd) & _PMD_PAGE_MASK) >> 1) + 17;
  60 #else
  61         return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
  62 #endif
  63 }
  64
  65 #endif /* CONFIG_PPC_BOOK3S_64 */
  66
  67
  68 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
  69                                     unsigned pdshift)
  70 {
  71         /*
  72          * On FSL BookE, we have multiple higher-level table entries that
  73          * point to the same hugepte.  Just use the first one since they're all
  74          * identical.  So for that case, idx=0.
  75          */
  76         unsigned long idx = 0;
  77
  78         pte_t *dir = hugepd_page(hpd);
  79 #ifndef CONFIG_PPC_FSL_BOOK3E
  80         idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
  81 #endif
  82
  83         return dir + idx;
  84 }
  85
  86 void flush_dcache_icache_hugepage(struct page *page);
  87
  88 int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
  89                            unsigned long len);
  90
  91 static inline int is_hugepage_only_range(struct mm_struct *mm,
  92                                          unsigned long addr,
  93                                          unsigned long len)
  94 {
  95         if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled())
  96                 return slice_is_hugepage_only_range(mm, addr, len);
  97         return 0;
  98 }
  99
 100 void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
 101                             pte_t pte);
 102 #ifdef CONFIG_PPC_8xx
 103 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
 104                                       unsigned long vmaddr)
 105 {
 106         flush_tlb_page(vma, vmaddr);
 107 }
 108 #else
 109 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 110 #endif
 111
 112 #define __HAVE_ARCH_HUGETLB_FREE_PGD_RANGE
 113 void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 114                             unsigned long end, unsigned long floor,
 115                             unsigned long ceiling);
 116
 117 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
 118 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 119                                             unsigned long addr, pte_t *ptep)
 120 {
 121 #ifdef CONFIG_PPC64
 122         return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1));
 123 #else
 124         return __pte(pte_update(ptep, ~0UL, 0));
 125 #endif
 126 }
 127
 128 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
 129 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
 130                                          unsigned long addr, pte_t *ptep)
 131 {
 132         pte_t pte;
 133         pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
 134         flush_hugetlb_page(vma, addr);
 135 }
 136
 137 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
 138 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 139                                       unsigned long addr, pte_t *ptep,
 140                                       pte_t pte, int dirty);
 141
 142 static inline void arch_clear_hugepage_flags(struct page *page)
 143 {
 144 }
 145
 146 #include <asm-generic/hugetlb.h>
 147
 148 #else /* ! CONFIG_HUGETLB_PAGE */
 149 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
 150                                       unsigned long vmaddr)
 151 {
 152 }
 153
 154 #define hugepd_shift(x) 0
 155 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
 156                                     unsigned pdshift)
 157 {
 158         return NULL;
 159 }
 160 #endif /* CONFIG_HUGETLB_PAGE */
 161
 162 #endif /* _ASM_POWERPC_HUGETLB_H */