arch/powerpc/mm/book3s64/radix_hugetlbpage.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/mm.h>
   3 #include <linux/hugetlb.h>
   4 #include <linux/security.h>
   5 #include <asm/cacheflush.h>
   6 #include <asm/machdep.h>
   7 #include <asm/mman.h>
   8 #include <asm/tlb.h>
   9
  10 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  11 {
  12         int psize;
  13         struct hstate *hstate = hstate_file(vma->vm_file);
  14
  15         psize = hstate_get_psize(hstate);
  16         radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  17 }
  18
  19 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  20 {
  21         int psize;
  22         struct hstate *hstate = hstate_file(vma->vm_file);
  23
  24         psize = hstate_get_psize(hstate);
  25         radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  26 }
  27
  28 void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
  29                                    unsigned long end)
  30 {
  31         int psize;
  32         struct hstate *hstate = hstate_file(vma->vm_file);
  33
  34         psize = hstate_get_psize(hstate);
  35         /*
  36          * Flush PWC even if we get PUD_SIZE hugetlb invalidate to keep this simpler.
  37          */
  38         if (end - start >= PUD_SIZE)
  39                 radix__flush_tlb_pwc_range_psize(vma->vm_mm, start, end, psize);
  40         else
  41                 radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
  42 }
  43
  44 void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
  45                                          unsigned long addr, pte_t *ptep,
  46                                          pte_t old_pte, pte_t pte)
  47 {
  48         struct mm_struct *mm = vma->vm_mm;
  49
  50         /*
  51          * To avoid NMMU hang while relaxing access we need to flush the tlb before
  52          * we set the new value.
  53          */
  54         if (is_pte_rw_upgrade(pte_val(old_pte), pte_val(pte)) &&
  55             (atomic_read(&mm->context.copros) > 0))
  56                 radix__flush_hugetlb_page(vma, addr);
  57
  58         set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
  59 }