arch/powerpc/mm/hugetlbpage-radix.c

   1 #include <linux/mm.h>
   2 #include <linux/hugetlb.h>
   3 #include <asm/pgtable.h>
   4 #include <asm/pgalloc.h>
   5 #include <asm/cacheflush.h>
   6 #include <asm/machdep.h>
   7 #include <asm/mman.h>
   8
   9 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  10 {
  11         unsigned long ap, shift;
  12         struct hstate *hstate = hstate_file(vma->vm_file);
  13
  14         shift = huge_page_shift(hstate);
  15         if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
  16                 ap = mmu_get_ap(MMU_PAGE_2M);
  17         else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
  18                 ap = mmu_get_ap(MMU_PAGE_1G);
  19         else {
  20                 WARN(1, "Wrong huge page shift\n");
  21                 return ;
  22         }
  23         radix___flush_tlb_page(vma->vm_mm, vmaddr, ap, 0);
  24 }
  25
  26 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  27 {
  28         unsigned long ap, shift;
  29         struct hstate *hstate = hstate_file(vma->vm_file);
  30
  31         shift = huge_page_shift(hstate);
  32         if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
  33                 ap = mmu_get_ap(MMU_PAGE_2M);
  34         else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
  35                 ap = mmu_get_ap(MMU_PAGE_1G);
  36         else {
  37                 WARN(1, "Wrong huge page shift\n");
  38                 return ;
  39         }
  40         radix___local_flush_tlb_page(vma->vm_mm, vmaddr, ap, 0);
  41 }
  42
  43 /*
  44  * A vairant of hugetlb_get_unmapped_area doing topdown search
  45  * FIXME!! should we do as x86 does or non hugetlb area does ?
  46  * ie, use topdown or not based on mmap_is_legacy check ?
  47  */
  48 unsigned long
  49 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  50                                 unsigned long len, unsigned long pgoff,
  51                                 unsigned long flags)
  52 {
  53         struct mm_struct *mm = current->mm;
  54         struct vm_area_struct *vma;
  55         struct hstate *h = hstate_file(file);
  56         struct vm_unmapped_area_info info;
  57
  58         if (len & ~huge_page_mask(h))
  59                 return -EINVAL;
  60         if (len > TASK_SIZE)
  61                 return -ENOMEM;
  62
  63         if (flags & MAP_FIXED) {
  64                 if (prepare_hugepage_range(file, addr, len))
  65                         return -EINVAL;
  66                 return addr;
  67         }
  68
  69         if (addr) {
  70                 addr = ALIGN(addr, huge_page_size(h));
  71                 vma = find_vma(mm, addr);
  72                 if (TASK_SIZE - len >= addr &&
  73                     (!vma || addr + len <= vma->vm_start))
  74                         return addr;
  75         }
  76         /*
  77          * We are always doing an topdown search here. Slice code
  78          * does that too.
  79          */
  80         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
  81         info.length = len;
  82         info.low_limit = PAGE_SIZE;
  83         info.high_limit = current->mm->mmap_base;
  84         info.align_mask = PAGE_MASK & ~huge_page_mask(h);
  85         info.align_offset = 0;
  86         return vm_unmapped_area(&info);
  87 }