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201 lines
4.7 KiB
201 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* IA-64 Huge TLB Page Support for Kernel. |
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* |
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* Copyright (C) 2002-2004 Rohit Seth <[email protected]> |
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* Copyright (C) 2003-2004 Ken Chen <[email protected]> |
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* |
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* Sep, 2003: add numa support |
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* Feb, 2004: dynamic hugetlb page size via boot parameter |
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*/ |
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#include <linux/init.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/hugetlb.h> |
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#include <linux/pagemap.h> |
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#include <linux/module.h> |
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#include <linux/sysctl.h> |
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#include <linux/log2.h> |
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#include <asm/mman.h> |
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#include <asm/tlb.h> |
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#include <asm/tlbflush.h> |
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unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT; |
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EXPORT_SYMBOL(hpage_shift); |
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pte_t * |
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huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
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unsigned long addr, unsigned long sz) |
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{ |
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unsigned long taddr = htlbpage_to_page(addr); |
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pgd_t *pgd; |
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p4d_t *p4d; |
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pud_t *pud; |
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pmd_t *pmd; |
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pte_t *pte = NULL; |
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pgd = pgd_offset(mm, taddr); |
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p4d = p4d_offset(pgd, taddr); |
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pud = pud_alloc(mm, p4d, taddr); |
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if (pud) { |
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pmd = pmd_alloc(mm, pud, taddr); |
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if (pmd) |
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pte = pte_alloc_map(mm, pmd, taddr); |
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} |
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return pte; |
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} |
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pte_t * |
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huge_pte_offset (struct mm_struct *mm, unsigned long addr, unsigned long sz) |
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{ |
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unsigned long taddr = htlbpage_to_page(addr); |
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pgd_t *pgd; |
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p4d_t *p4d; |
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pud_t *pud; |
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pmd_t *pmd; |
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pte_t *pte = NULL; |
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pgd = pgd_offset(mm, taddr); |
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if (pgd_present(*pgd)) { |
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p4d = p4d_offset(pgd, addr); |
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if (p4d_present(*p4d)) { |
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pud = pud_offset(p4d, taddr); |
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if (pud_present(*pud)) { |
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pmd = pmd_offset(pud, taddr); |
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if (pmd_present(*pmd)) |
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pte = pte_offset_map(pmd, taddr); |
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} |
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} |
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} |
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return pte; |
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} |
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#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; } |
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/* |
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* Don't actually need to do any preparation, but need to make sure |
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* the address is in the right region. |
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*/ |
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int prepare_hugepage_range(struct file *file, |
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unsigned long addr, unsigned long len) |
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{ |
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if (len & ~HPAGE_MASK) |
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return -EINVAL; |
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if (addr & ~HPAGE_MASK) |
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return -EINVAL; |
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if (REGION_NUMBER(addr) != RGN_HPAGE) |
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return -EINVAL; |
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return 0; |
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} |
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write) |
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{ |
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struct page *page; |
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pte_t *ptep; |
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if (REGION_NUMBER(addr) != RGN_HPAGE) |
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return ERR_PTR(-EINVAL); |
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ptep = huge_pte_offset(mm, addr, HPAGE_SIZE); |
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if (!ptep || pte_none(*ptep)) |
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return NULL; |
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page = pte_page(*ptep); |
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page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT); |
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return page; |
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} |
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int pmd_huge(pmd_t pmd) |
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{ |
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return 0; |
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} |
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int pud_huge(pud_t pud) |
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{ |
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return 0; |
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} |
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void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
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unsigned long addr, unsigned long end, |
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unsigned long floor, unsigned long ceiling) |
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{ |
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/* |
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* This is called to free hugetlb page tables. |
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* |
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* The offset of these addresses from the base of the hugetlb |
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* region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that |
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* the standard free_pgd_range will free the right page tables. |
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* |
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* If floor and ceiling are also in the hugetlb region, they |
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* must likewise be scaled down; but if outside, left unchanged. |
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*/ |
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addr = htlbpage_to_page(addr); |
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end = htlbpage_to_page(end); |
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if (REGION_NUMBER(floor) == RGN_HPAGE) |
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floor = htlbpage_to_page(floor); |
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if (REGION_NUMBER(ceiling) == RGN_HPAGE) |
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ceiling = htlbpage_to_page(ceiling); |
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free_pgd_range(tlb, addr, end, floor, ceiling); |
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} |
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unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, |
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unsigned long pgoff, unsigned long flags) |
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{ |
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struct vm_unmapped_area_info info; |
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if (len > RGN_MAP_LIMIT) |
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return -ENOMEM; |
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if (len & ~HPAGE_MASK) |
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return -EINVAL; |
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/* Handle MAP_FIXED */ |
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if (flags & MAP_FIXED) { |
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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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/* This code assumes that RGN_HPAGE != 0. */ |
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if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1))) |
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addr = HPAGE_REGION_BASE; |
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info.flags = 0; |
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info.length = len; |
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info.low_limit = addr; |
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info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT; |
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info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1); |
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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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static int __init hugetlb_setup_sz(char *str) |
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{ |
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u64 tr_pages; |
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unsigned long long size; |
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if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0) |
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/* |
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* shouldn't happen, but just in case. |
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*/ |
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tr_pages = 0x15557000UL; |
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size = memparse(str, &str); |
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if (*str || !is_power_of_2(size) || !(tr_pages & size) || |
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size <= PAGE_SIZE || |
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size >= (1UL << PAGE_SHIFT << MAX_ORDER)) { |
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printk(KERN_WARNING "Invalid huge page size specified\n"); |
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return 1; |
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} |
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hpage_shift = __ffs(size); |
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/* |
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* boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT |
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* override here with new page shift. |
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*/ |
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ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2); |
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return 0; |
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} |
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early_param("hugepagesz", hugetlb_setup_sz);
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