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 #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         radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
  36 }
  37
  38 /*
  39  * A vairant of hugetlb_get_unmapped_area doing topdown search
  40  * FIXME!! should we do as x86 does or non hugetlb area does ?
  41  * ie, use topdown or not based on mmap_is_legacy check ?
  42  */
  43 unsigned long
  44 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  45                                 unsigned long len, unsigned long pgoff,
  46                                 unsigned long flags)
  47 {
  48         struct mm_struct *mm = current->mm;
  49         struct vm_area_struct *vma;
  50         struct hstate *h = hstate_file(file);
  51         struct vm_unmapped_area_info info;
  52
  53         if (unlikely(addr > mm->context.addr_limit && addr < TASK_SIZE))
  54                 mm->context.addr_limit = TASK_SIZE;
  55
  56         if (len & ~huge_page_mask(h))
  57                 return -EINVAL;
  58         if (len > mm->task_size)
  59                 return -ENOMEM;
  60
  61         if (flags & MAP_FIXED) {
  62                 if (prepare_hugepage_range(file, addr, len))
  63                         return -EINVAL;
  64                 return addr;
  65         }
  66
  67         if (addr) {
  68                 addr = ALIGN(addr, huge_page_size(h));
  69                 vma = find_vma(mm, addr);
  70                 if (mm->task_size - len >= addr &&
  71                     (!vma || addr + len <= vm_start_gap(vma)))
  72                         return addr;
  73         }
  74         /*
  75          * We are always doing an topdown search here. Slice code
  76          * does that too.
  77          */
  78         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
  79         info.length = len;
  80         info.low_limit = PAGE_SIZE;
  81         info.high_limit = current->mm->mmap_base;
  82         info.align_mask = PAGE_MASK & ~huge_page_mask(h);
  83         info.align_offset = 0;
  84
  85         if (addr > DEFAULT_MAP_WINDOW)
  86                 info.high_limit += mm->context.addr_limit - DEFAULT_MAP_WINDOW;
  87
  88         return vm_unmapped_area(&info);
  89 }