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/cacheflush.h>
6 #include <asm/machdep.h>
7 #include <asm/mman.h>
8 #include <asm/tlb.h>
9
radix__flush_hugetlb_page(struct vm_area_struct * vma,unsigned long vmaddr)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
radix__local_flush_hugetlb_page(struct vm_area_struct * vma,unsigned long vmaddr)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
radix__flush_hugetlb_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)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
radix__hugetlb_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)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 int fixed = (flags & MAP_FIXED);
52 unsigned long high_limit;
53 struct vm_unmapped_area_info info;
54
55 high_limit = DEFAULT_MAP_WINDOW;
56 if (addr >= high_limit || (fixed && (addr + len > high_limit)))
57 high_limit = TASK_SIZE;
58
59 if (len & ~huge_page_mask(h))
60 return -EINVAL;
61 if (len > high_limit)
62 return -ENOMEM;
63
64 if (fixed) {
65 if (addr > high_limit - len)
66 return -ENOMEM;
67 if (prepare_hugepage_range(file, addr, len))
68 return -EINVAL;
69 return addr;
70 }
71
72 if (addr) {
73 addr = ALIGN(addr, huge_page_size(h));
74 vma = find_vma(mm, addr);
75 if (high_limit - len >= addr && addr >= mmap_min_addr &&
76 (!vma || addr + len <= vm_start_gap(vma)))
77 return addr;
78 }
79 /*
80 * We are always doing an topdown search here. Slice code
81 * does that too.
82 */
83 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
84 info.length = len;
85 info.low_limit = max(PAGE_SIZE, mmap_min_addr);
86 info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
87 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
88 info.align_offset = 0;
89
90 return vm_unmapped_area(&info);
91 }
92
radix__huge_ptep_modify_prot_commit(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep,pte_t old_pte,pte_t pte)93 void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
94 unsigned long addr, pte_t *ptep,
95 pte_t old_pte, pte_t pte)
96 {
97 struct mm_struct *mm = vma->vm_mm;
98
99 /*
100 * To avoid NMMU hang while relaxing access we need to flush the tlb before
101 * we set the new value.
102 */
103 if (is_pte_rw_upgrade(pte_val(old_pte), pte_val(pte)) &&
104 (atomic_read(&mm->context.copros) > 0))
105 radix__flush_hugetlb_page(vma, addr);
106
107 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
108 }
109
