// SPDX-License-Identifier: GPL-2.0
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/security.h>
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#include <asm/cacheflush.h>
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#include <asm/machdep.h>
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#include <asm/mman.h>
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#include <asm/tlb.h>
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void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
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}
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void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
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}
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void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
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}
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/*
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* A vairant of hugetlb_get_unmapped_area doing topdown search
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* FIXME!! should we do as x86 does or non hugetlb area does ?
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* ie, use topdown or not based on mmap_is_legacy check ?
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*/
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unsigned long
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radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct hstate *h = hstate_file(file);
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int fixed = (flags & MAP_FIXED);
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unsigned long high_limit;
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struct vm_unmapped_area_info info;
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high_limit = DEFAULT_MAP_WINDOW;
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if (addr >= high_limit || (fixed && (addr + len > high_limit)))
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high_limit = TASK_SIZE;
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (len > high_limit)
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return -ENOMEM;
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if (fixed) {
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if (addr > high_limit - len)
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return -ENOMEM;
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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if (addr) {
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addr = ALIGN(addr, huge_page_size(h));
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vma = find_vma(mm, addr);
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if (high_limit - len >= addr && addr >= mmap_min_addr &&
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(!vma || addr + len <= vm_start_gap(vma)))
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return addr;
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}
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/*
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* We are always doing an topdown search here. Slice code
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* does that too.
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*/
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = max(PAGE_SIZE, mmap_min_addr);
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info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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return vm_unmapped_area(&info);
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}
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void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t old_pte, pte_t pte)
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{
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struct mm_struct *mm = vma->vm_mm;
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/*
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* To avoid NMMU hang while relaxing access we need to flush the tlb before
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* we set the new value.
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*/
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if (is_pte_rw_upgrade(pte_val(old_pte), pte_val(pte)) &&
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(atomic_read(&mm->context.copros) > 0))
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radix__flush_hugetlb_page(vma, addr);
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set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
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}
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