arch/powerpc/mm/hugetlbpage-radix.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/mm.h>
   3 #include <linux/hugetlb.h>
   4 #include <asm/pgtable.h>
   5 #include <asm/pgalloc.h>
   6 #include <asm/cacheflush.h>
   7 #include <asm/machdep.h>
   8 #include <asm/mman.h>
   9 #include <asm/tlb.h>
  10
  11 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  12 {
  13         int psize;
  14         struct hstate *hstate = hstate_file(vma->vm_file);
  15
  16         psize = hstate_get_psize(hstate);
  17         radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  18 }
  19
  20 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  21 {
  22         int psize;
  23         struct hstate *hstate = hstate_file(vma->vm_file);
  24
  25         psize = hstate_get_psize(hstate);
  26         radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  27 }
  28
  29 void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
  30                                    unsigned long end)
  31 {
  32         int psize;
  33         struct hstate *hstate = hstate_file(vma->vm_file);
  34
  35         psize = hstate_get_psize(hstate);
  36         radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
  37 }
  38
  39 /*
  40  * A vairant of hugetlb_get_unmapped_area doing topdown search
  41  * FIXME!! should we do as x86 does or non hugetlb area does ?
  42  * ie, use topdown or not based on mmap_is_legacy check ?
  43  */
  44 unsigned long
  45 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  46                                 unsigned long len, unsigned long pgoff,
  47                                 unsigned long flags)
  48 {
  49         struct mm_struct *mm = current->mm;
  50         struct vm_area_struct *vma;
  51         struct hstate *h = hstate_file(file);
  52         int fixed = (flags & MAP_FIXED);
  53         unsigned long high_limit;
  54         struct vm_unmapped_area_info info;
  55
  56         high_limit = DEFAULT_MAP_WINDOW;
  57         if (addr >= high_limit || (fixed && (addr + len > high_limit)))
  58                 high_limit = TASK_SIZE;
  59
  60         if (len & ~huge_page_mask(h))
  61                 return -EINVAL;
  62         if (len > high_limit)
  63                 return -ENOMEM;
  64
  65         if (fixed) {
  66                 if (addr > high_limit - len)
  67                         return -ENOMEM;
  68                 if (prepare_hugepage_range(file, addr, len))
  69                         return -EINVAL;
  70                 return addr;
  71         }
  72
  73         if (addr) {
  74                 addr = ALIGN(addr, huge_page_size(h));
  75                 vma = find_vma(mm, addr);
  76                 if (high_limit - len >= addr &&
  77                     (!vma || addr + len <= vm_start_gap(vma)))
  78                         return addr;
  79         }
  80         /*
  81          * We are always doing an topdown search here. Slice code
  82          * does that too.
  83          */
  84         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
  85         info.length = len;
  86         info.low_limit = PAGE_SIZE;
  87         info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
  88         info.align_mask = PAGE_MASK & ~huge_page_mask(h);
  89         info.align_offset = 0;
  90
  91         return vm_unmapped_area(&info);
  92 }