LXR linux/arch/powerpc/mm/book3s64/radix

   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
  12void 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
  21void 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
  30void 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 */
  45unsigned long
  46radix__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
  66        if (fixed) {
  67                if (addr > high_limit - len)
  68                        return -ENOMEM;
  69                if (prepare_hugepage_range(file, addr, len))
  70                        return -EINVAL;
  71                return addr;
  72        }
  73
  74        if (addr) {
  75                addr = ALIGN(addr, huge_page_size(h));
  76                vma = find_vma(mm, addr);
  77                if (high_limit - len >= addr && addr >= mmap_min_addr &&
  78                    (!vma || addr + len <= vm_start_gap(vma)))
  79                        return addr;
  80        }
  81        /*
  82         * We are always doing an topdown search here. Slice code
  83         * does that too.
  84         */
  85        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
  86        info.length = len;
  87        info.low_limit = max(PAGE_SIZE, mmap_min_addr);
  88        info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
  89        info.align_mask = PAGE_MASK & ~huge_page_mask(h);
  90        info.align_offset = 0;
  91
  92        return vm_unmapped_area(&info);
  93}
  94
  95void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
  96                                         unsigned long addr, pte_t *ptep,
  97                                         pte_t old_pte, pte_t pte)
  98{
  99        struct mm_struct *mm = vma->vm_mm;
 100
 101        /*
 102         * To avoid NMMU hang while relaxing access we need to flush the tlb before
 103         * we set the new value.
 104         */
 105        if (is_pte_rw_upgrade(pte_val(old_pte), pte_val(pte)) &&
 106            (atomic_read(&mm->context.copros) > 0))
 107                radix__flush_hugetlb_page(vma, addr);
 108
 109        set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
 110}
 111