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