diff options
Diffstat (limited to 'arch/metag/mm/hugetlbpage.c')
| -rw-r--r-- | arch/metag/mm/hugetlbpage.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/arch/metag/mm/hugetlbpage.c b/arch/metag/mm/hugetlbpage.c deleted file mode 100644 index 012ee4c..0000000 --- a/arch/metag/mm/hugetlbpage.c +++ /dev/null @@ -1,251 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * arch/metag/mm/hugetlbpage.c - * - * METAG HugeTLB page support. - * - * Cloned from SuperH - * - * Cloned from sparc64 by Paul Mundt. - * - * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) - */ - -#include <linux/init.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/pagemap.h> -#include <linux/sysctl.h> - -#include <asm/mman.h> -#include <asm/pgalloc.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> -#include <asm/cacheflush.h> - -/* - * If the arch doesn't supply something else, assume that hugepage - * size aligned regions are ok without further preparation. - */ -int prepare_hugepage_range(struct file *file, unsigned long addr, - unsigned long len) -{ - struct mm_struct *mm = current->mm; - struct hstate *h = hstate_file(file); - struct vm_area_struct *vma; - - if (len & ~huge_page_mask(h)) - return -EINVAL; - if (addr & ~huge_page_mask(h)) - return -EINVAL; - if (TASK_SIZE - len < addr) - return -EINVAL; - - vma = find_vma(mm, ALIGN_HUGEPT(addr)); - if (vma && !(vma->vm_flags & MAP_HUGETLB)) - return -EINVAL; - - vma = find_vma(mm, addr); - if (vma) { - if (addr + len > vma->vm_start) - return -EINVAL; - if (!(vma->vm_flags & MAP_HUGETLB) && - (ALIGN_HUGEPT(addr + len) > vma->vm_start)) - return -EINVAL; - } - return 0; -} - -pte_t *huge_pte_alloc(struct mm_struct *mm, - unsigned long addr, unsigned long sz) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - pgd = pgd_offset(mm, addr); - pud = pud_offset(pgd, addr); - pmd = pmd_offset(pud, addr); - pte = pte_alloc_map(mm, pmd, addr); - pgd->pgd &= ~_PAGE_SZ_MASK; - pgd->pgd |= _PAGE_SZHUGE; - - return pte; -} - -pte_t *huge_pte_offset(struct mm_struct *mm, - unsigned long addr, unsigned long sz) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte = NULL; - - pgd = pgd_offset(mm, addr); - pud = pud_offset(pgd, addr); - pmd = pmd_offset(pud, addr); - pte = pte_offset_kernel(pmd, addr); - - return pte; -} - -int pmd_huge(pmd_t pmd) -{ - return pmd_page_shift(pmd) > PAGE_SHIFT; -} - -int pud_huge(pud_t pud) -{ - return 0; -} - -struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, - pmd_t *pmd, int write) -{ - return NULL; -} - -#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA - -/* - * Look for an unmapped area starting after another hugetlb vma. - * There are guaranteed to be no huge pte's spare if all the huge pages are - * full size (4MB), so in that case compile out this search. - */ -#if HPAGE_SHIFT == HUGEPT_SHIFT -static inline unsigned long -hugetlb_get_unmapped_area_existing(unsigned long len) -{ - return 0; -} -#else -static unsigned long -hugetlb_get_unmapped_area_existing(unsigned long len) -{ - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - unsigned long start_addr, addr; - int after_huge; - - if (mm->context.part_huge) { - start_addr = mm->context.part_huge; - after_huge = 1; - } else { - start_addr = TASK_UNMAPPED_BASE; - after_huge = 0; - } -new_search: - addr = start_addr; - - for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { - if ((!vma && !after_huge) || TASK_SIZE - len < addr) { - /* - * Start a new search - just in case we missed - * some holes. - */ - if (start_addr != TASK_UNMAPPED_BASE) { - start_addr = TASK_UNMAPPED_BASE; - goto new_search; - } - return 0; - } - /* skip ahead if we've aligned right over some vmas */ - if (vma && vma->vm_end <= addr) - continue; - /* space before the next vma? */ - if (after_huge && (!vma || ALIGN_HUGEPT(addr + len) - <= vma->vm_start)) { - unsigned long end = addr + len; - if (end & HUGEPT_MASK) - mm->context.part_huge = end; - else if (addr == mm->context.part_huge) - mm->context.part_huge = 0; - return addr; - } - if (vma->vm_flags & MAP_HUGETLB) { - /* space after a huge vma in 2nd level page table? */ - if (vma->vm_end & HUGEPT_MASK) { - after_huge = 1; - /* no need to align to the next PT block */ - addr = vma->vm_end; - continue; - } - } - after_huge = 0; - addr = ALIGN_HUGEPT(vma->vm_end); - } -} -#endif - -/* Do a full search to find an area without any nearby normal pages. */ -static unsigned long -hugetlb_get_unmapped_area_new_pmd(unsigned long len) -{ - struct vm_unmapped_area_info info; - - info.flags = 0; - info.length = len; - info.low_limit = TASK_UNMAPPED_BASE; - info.high_limit = TASK_SIZE; - info.align_mask = PAGE_MASK & HUGEPT_MASK; - info.align_offset = 0; - return vm_unmapped_area(&info); -} - -unsigned long -hugetlb_get_unmapped_area(struct file *file, unsigned long addr, - unsigned long len, unsigned long pgoff, unsigned long flags) -{ - struct hstate *h = hstate_file(file); - - if (len & ~huge_page_mask(h)) - return -EINVAL; - if (len > TASK_SIZE) - return -ENOMEM; - - if (flags & MAP_FIXED) { - if (prepare_hugepage_range(file, addr, len)) - return -EINVAL; - return addr; - } - - if (addr) { - addr = ALIGN(addr, huge_page_size(h)); - if (!prepare_hugepage_range(file, addr, len)) - return addr; - } - - /* - * Look for an existing hugetlb vma with space after it (this is to to - * minimise fragmentation caused by huge pages. - */ - addr = hugetlb_get_unmapped_area_existing(len); - if (addr) - return addr; - - /* - * Find an unmapped naturally aligned set of 4MB blocks that we can use - * for huge pages. - */ - return hugetlb_get_unmapped_area_new_pmd(len); -} - -#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/ - -/* necessary for boot time 4MB huge page allocation */ -static __init int setup_hugepagesz(char *opt) -{ - unsigned long ps = memparse(opt, &opt); - if (ps == (1 << HPAGE_SHIFT)) { - hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", - ps >> 20); - return 0; - } - return 1; -} -__setup("hugepagesz=", setup_hugepagesz); |
