diff options
Diffstat (limited to 'arch/ia64/mm/hugetlbpage.c')
| -rw-r--r-- | arch/ia64/mm/hugetlbpage.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c deleted file mode 100644 index d16e419fd712..000000000000 --- a/arch/ia64/mm/hugetlbpage.c +++ /dev/null @@ -1,195 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * IA-64 Huge TLB Page Support for Kernel. - * - * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com> - * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com> - * - * Sep, 2003: add numa support - * Feb, 2004: dynamic hugetlb page size via boot parameter - */ - -#include <linux/init.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/pagemap.h> -#include <linux/module.h> -#include <linux/sysctl.h> -#include <linux/log2.h> -#include <asm/mman.h> -#include <asm/pgalloc.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> - -unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT; -EXPORT_SYMBOL(hpage_shift); - -pte_t * -huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) -{ - unsigned long taddr = htlbpage_to_page(addr); - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte = NULL; - - pgd = pgd_offset(mm, taddr); - pud = pud_alloc(mm, pgd, taddr); - if (pud) { - pmd = pmd_alloc(mm, pud, taddr); - if (pmd) - pte = pte_alloc_map(mm, pmd, taddr); - } - return pte; -} - -pte_t * -huge_pte_offset (struct mm_struct *mm, unsigned long addr, unsigned long sz) -{ - unsigned long taddr = htlbpage_to_page(addr); - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte = NULL; - - pgd = pgd_offset(mm, taddr); - if (pgd_present(*pgd)) { - pud = pud_offset(pgd, taddr); - if (pud_present(*pud)) { - pmd = pmd_offset(pud, taddr); - if (pmd_present(*pmd)) - pte = pte_offset_map(pmd, taddr); - } - } - - return pte; -} - -#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; } - -/* - * Don't actually need to do any preparation, but need to make sure - * the address is in the right region. - */ -int prepare_hugepage_range(struct file *file, - unsigned long addr, unsigned long len) -{ - if (len & ~HPAGE_MASK) - return -EINVAL; - if (addr & ~HPAGE_MASK) - return -EINVAL; - if (REGION_NUMBER(addr) != RGN_HPAGE) - return -EINVAL; - - return 0; -} - -struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write) -{ - struct page *page; - pte_t *ptep; - - if (REGION_NUMBER(addr) != RGN_HPAGE) - return ERR_PTR(-EINVAL); - - ptep = huge_pte_offset(mm, addr, HPAGE_SIZE); - if (!ptep || pte_none(*ptep)) - return NULL; - page = pte_page(*ptep); - page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT); - return page; -} -int pmd_huge(pmd_t pmd) -{ - return 0; -} - -int pud_huge(pud_t pud) -{ - return 0; -} - -void hugetlb_free_pgd_range(struct mmu_gather *tlb, - unsigned long addr, unsigned long end, - unsigned long floor, unsigned long ceiling) -{ - /* - * This is called to free hugetlb page tables. - * - * The offset of these addresses from the base of the hugetlb - * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that - * the standard free_pgd_range will free the right page tables. - * - * If floor and ceiling are also in the hugetlb region, they - * must likewise be scaled down; but if outside, left unchanged. - */ - - addr = htlbpage_to_page(addr); - end = htlbpage_to_page(end); - if (REGION_NUMBER(floor) == RGN_HPAGE) - floor = htlbpage_to_page(floor); - if (REGION_NUMBER(ceiling) == RGN_HPAGE) - ceiling = htlbpage_to_page(ceiling); - - free_pgd_range(tlb, addr, end, floor, ceiling); -} - -unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags) -{ - struct vm_unmapped_area_info info; - - if (len > RGN_MAP_LIMIT) - return -ENOMEM; - if (len & ~HPAGE_MASK) - return -EINVAL; - - /* Handle MAP_FIXED */ - if (flags & MAP_FIXED) { - if (prepare_hugepage_range(file, addr, len)) - return -EINVAL; - return addr; - } - - /* This code assumes that RGN_HPAGE != 0. */ - if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1))) - addr = HPAGE_REGION_BASE; - - info.flags = 0; - info.length = len; - info.low_limit = addr; - info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT; - info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1); - info.align_offset = 0; - return vm_unmapped_area(&info); -} - -static int __init hugetlb_setup_sz(char *str) -{ - u64 tr_pages; - unsigned long long size; - - if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0) - /* - * shouldn't happen, but just in case. - */ - tr_pages = 0x15557000UL; - - size = memparse(str, &str); - if (*str || !is_power_of_2(size) || !(tr_pages & size) || - size <= PAGE_SIZE || - size >= (1UL << PAGE_SHIFT << MAX_ORDER)) { - printk(KERN_WARNING "Invalid huge page size specified\n"); - return 1; - } - - hpage_shift = __ffs(size); - /* - * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT - * override here with new page shift. - */ - ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2); - return 0; -} -early_param("hugepagesz", hugetlb_setup_sz); |