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 <linux/security.h>
   5 #include <asm/pgtable.h>
   6 #include <asm/pgalloc.h>
   7 #include <asm/cacheflush.h>
   8 #include <asm/machdep.h>
   9 #include <asm/mman.h>
  10 #include <asm/tlb.h>
  11
  12 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  13 {
  14         int psize;
  15         struct hstate *hstate = hstate_file(vma->vm_file);
  16
  17         psize = hstate_get_psize(hstate);
  18         radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  19 }
  20
  21 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
  22 {
  23         int psize;
  24         struct hstate *hstate = hstate_file(vma->vm_file);
  25
  26         psize = hstate_get_psize(hstate);
  27         radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
  28 }
  29
  30 void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
  31                                    unsigned long end)
  32 {
  33         int psize;
  34         struct hstate *hstate = hstate_file(vma->vm_file);
  35
  36         psize = hstate_get_psize(hstate);
  37         radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
  38 }
  39
  40 /*
  41  * A vairant of hugetlb_get_unmapped_area doing topdown search
  42  * FIXME!! should we do as x86 does or non hugetlb area does ?
  43  * ie, use topdown or not based on mmap_is_legacy check ?
  44  */
  45 unsigned long
  46 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  47                                 unsigned long len, unsigned long pgoff,
  48                                 unsigned long flags)
  49 {
  50         struct mm_struct *mm = current->mm;
  51         struct vm_area_struct *vma;
  52         struct hstate *h = hstate_file(file);
  53         int fixed = (flags & MAP_FIXED);
  54         unsigned long high_limit;
  55         struct vm_unmapped_area_info info;
  56
  57         high_limit = DEFAULT_MAP_WINDOW;
  58         if (addr >= high_limit || (fixed && (addr + len > high_limit)))
  59                 high_limit = TASK_SIZE;
  60
  61         if (len & ~huge_page_mask(h))
  62                 return -EINVAL;
  63         if (len > high_limit)
  64                 return -ENOMEM;
  65         if (fixed) {
  66                 if (addr > high_limit - len)
  67                         return -ENOMEM;
  68         }
  69
  70         if (unlikely(addr > mm->context.addr_limit &&
  71                      mm->context.addr_limit != TASK_SIZE))
  72                 mm->context.addr_limit = TASK_SIZE;
  73
  74         if (fixed) {
  75                 if (prepare_hugepage_range(file, addr, len))
  76                         return -EINVAL;
  77                 return addr;
  78         }
  79
  80         if (addr) {
  81                 addr = ALIGN(addr, huge_page_size(h));
  82                 vma = find_vma(mm, addr);
  83                 if (high_limit - len >= addr && addr >= mmap_min_addr &&
  84                     (!vma || addr + len <= vm_start_gap(vma)))
  85                         return addr;
  86         }
  87         /*
  88          * We are always doing an topdown search here. Slice code
  89          * does that too.
  90          */
  91         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
  92         info.length = len;
  93         info.low_limit = max(PAGE_SIZE, mmap_min_addr);
  94         info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
  95         info.align_mask = PAGE_MASK & ~huge_page_mask(h);
  96         info.align_offset = 0;
  97
  98         return vm_unmapped_area(&info);
  99 }