1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/mm.h>
3*4882a593Smuzhiyun #include <linux/hugetlb.h>
4*4882a593Smuzhiyun #include <linux/security.h>
5*4882a593Smuzhiyun #include <asm/cacheflush.h>
6*4882a593Smuzhiyun #include <asm/machdep.h>
7*4882a593Smuzhiyun #include <asm/mman.h>
8*4882a593Smuzhiyun #include <asm/tlb.h>
9*4882a593Smuzhiyun
radix__flush_hugetlb_page(struct vm_area_struct * vma,unsigned long vmaddr)10*4882a593Smuzhiyun void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun int psize;
13*4882a593Smuzhiyun struct hstate *hstate = hstate_file(vma->vm_file);
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun psize = hstate_get_psize(hstate);
16*4882a593Smuzhiyun radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
17*4882a593Smuzhiyun }
18*4882a593Smuzhiyun
radix__local_flush_hugetlb_page(struct vm_area_struct * vma,unsigned long vmaddr)19*4882a593Smuzhiyun void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun int psize;
22*4882a593Smuzhiyun struct hstate *hstate = hstate_file(vma->vm_file);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun psize = hstate_get_psize(hstate);
25*4882a593Smuzhiyun radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
radix__flush_hugetlb_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)28*4882a593Smuzhiyun void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
29*4882a593Smuzhiyun unsigned long end)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun int psize;
32*4882a593Smuzhiyun struct hstate *hstate = hstate_file(vma->vm_file);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun psize = hstate_get_psize(hstate);
35*4882a593Smuzhiyun radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /*
39*4882a593Smuzhiyun * A vairant of hugetlb_get_unmapped_area doing topdown search
40*4882a593Smuzhiyun * FIXME!! should we do as x86 does or non hugetlb area does ?
41*4882a593Smuzhiyun * ie, use topdown or not based on mmap_is_legacy check ?
42*4882a593Smuzhiyun */
43*4882a593Smuzhiyun unsigned long
radix__hugetlb_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)44*4882a593Smuzhiyun radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
45*4882a593Smuzhiyun unsigned long len, unsigned long pgoff,
46*4882a593Smuzhiyun unsigned long flags)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun struct mm_struct *mm = current->mm;
49*4882a593Smuzhiyun struct vm_area_struct *vma;
50*4882a593Smuzhiyun struct hstate *h = hstate_file(file);
51*4882a593Smuzhiyun int fixed = (flags & MAP_FIXED);
52*4882a593Smuzhiyun unsigned long high_limit;
53*4882a593Smuzhiyun struct vm_unmapped_area_info info;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun high_limit = DEFAULT_MAP_WINDOW;
56*4882a593Smuzhiyun if (addr >= high_limit || (fixed && (addr + len > high_limit)))
57*4882a593Smuzhiyun high_limit = TASK_SIZE;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun if (len & ~huge_page_mask(h))
60*4882a593Smuzhiyun return -EINVAL;
61*4882a593Smuzhiyun if (len > high_limit)
62*4882a593Smuzhiyun return -ENOMEM;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun if (fixed) {
65*4882a593Smuzhiyun if (addr > high_limit - len)
66*4882a593Smuzhiyun return -ENOMEM;
67*4882a593Smuzhiyun if (prepare_hugepage_range(file, addr, len))
68*4882a593Smuzhiyun return -EINVAL;
69*4882a593Smuzhiyun return addr;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun if (addr) {
73*4882a593Smuzhiyun addr = ALIGN(addr, huge_page_size(h));
74*4882a593Smuzhiyun vma = find_vma(mm, addr);
75*4882a593Smuzhiyun if (high_limit - len >= addr && addr >= mmap_min_addr &&
76*4882a593Smuzhiyun (!vma || addr + len <= vm_start_gap(vma)))
77*4882a593Smuzhiyun return addr;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun /*
80*4882a593Smuzhiyun * We are always doing an topdown search here. Slice code
81*4882a593Smuzhiyun * does that too.
82*4882a593Smuzhiyun */
83*4882a593Smuzhiyun info.flags = VM_UNMAPPED_AREA_TOPDOWN;
84*4882a593Smuzhiyun info.length = len;
85*4882a593Smuzhiyun info.low_limit = max(PAGE_SIZE, mmap_min_addr);
86*4882a593Smuzhiyun info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
87*4882a593Smuzhiyun info.align_mask = PAGE_MASK & ~huge_page_mask(h);
88*4882a593Smuzhiyun info.align_offset = 0;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return vm_unmapped_area(&info);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
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*4882a593Smuzhiyun void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
94*4882a593Smuzhiyun unsigned long addr, pte_t *ptep,
95*4882a593Smuzhiyun pte_t old_pte, pte_t pte)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun struct mm_struct *mm = vma->vm_mm;
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun /*
100*4882a593Smuzhiyun * To avoid NMMU hang while relaxing access we need to flush the tlb before
101*4882a593Smuzhiyun * we set the new value.
102*4882a593Smuzhiyun */
103*4882a593Smuzhiyun if (is_pte_rw_upgrade(pte_val(old_pte), pte_val(pte)) &&
104*4882a593Smuzhiyun (atomic_read(&mm->context.copros) > 0))
105*4882a593Smuzhiyun radix__flush_hugetlb_page(vma, addr);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
108*4882a593Smuzhiyun }
109