258 lines
7.7 KiB
C
258 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2007,2020
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#define KMSG_COMPONENT "hugetlb"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <asm/pgalloc.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <linux/security.h>
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/*
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* If the bit selected by single-bit bitmask "a" is set within "x", move
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* it to the position indicated by single-bit bitmask "b".
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*/
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#define move_set_bit(x, a, b) (((x) & (a)) >> ilog2(a) << ilog2(b))
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static inline unsigned long __pte_to_rste(pte_t pte)
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{
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swp_entry_t arch_entry;
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unsigned long rste;
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/*
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* Convert encoding pte bits pmd / pud bits
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* lIR.uswrdy.p dy..R...I...wr
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* empty 010.000000.0 -> 00..0...1...00
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* prot-none, clean, old 111.000000.1 -> 00..1...1...00
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* prot-none, clean, young 111.000001.1 -> 01..1...1...00
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* prot-none, dirty, old 111.000010.1 -> 10..1...1...00
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* prot-none, dirty, young 111.000011.1 -> 11..1...1...00
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* read-only, clean, old 111.000100.1 -> 00..1...1...01
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* read-only, clean, young 101.000101.1 -> 01..1...0...01
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* read-only, dirty, old 111.000110.1 -> 10..1...1...01
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* read-only, dirty, young 101.000111.1 -> 11..1...0...01
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* read-write, clean, old 111.001100.1 -> 00..1...1...11
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* read-write, clean, young 101.001101.1 -> 01..1...0...11
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* read-write, dirty, old 110.001110.1 -> 10..0...1...11
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* read-write, dirty, young 100.001111.1 -> 11..0...0...11
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* HW-bits: R read-only, I invalid
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* SW-bits: p present, y young, d dirty, r read, w write, s special,
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* u unused, l large
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*/
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if (pte_present(pte)) {
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rste = pte_val(pte) & PAGE_MASK;
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rste |= _SEGMENT_ENTRY_PRESENT;
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rste |= move_set_bit(pte_val(pte), _PAGE_READ,
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_SEGMENT_ENTRY_READ);
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rste |= move_set_bit(pte_val(pte), _PAGE_WRITE,
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_SEGMENT_ENTRY_WRITE);
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rste |= move_set_bit(pte_val(pte), _PAGE_INVALID,
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_SEGMENT_ENTRY_INVALID);
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rste |= move_set_bit(pte_val(pte), _PAGE_PROTECT,
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_SEGMENT_ENTRY_PROTECT);
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rste |= move_set_bit(pte_val(pte), _PAGE_DIRTY,
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_SEGMENT_ENTRY_DIRTY);
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rste |= move_set_bit(pte_val(pte), _PAGE_YOUNG,
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_SEGMENT_ENTRY_YOUNG);
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#ifdef CONFIG_MEM_SOFT_DIRTY
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rste |= move_set_bit(pte_val(pte), _PAGE_SOFT_DIRTY,
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_SEGMENT_ENTRY_SOFT_DIRTY);
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#endif
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rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC,
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_SEGMENT_ENTRY_NOEXEC);
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} else if (!pte_none(pte)) {
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/* swap pte */
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arch_entry = __pte_to_swp_entry(pte);
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rste = mk_swap_rste(__swp_type(arch_entry), __swp_offset(arch_entry));
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} else
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rste = _SEGMENT_ENTRY_EMPTY;
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return rste;
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}
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static inline pte_t __rste_to_pte(unsigned long rste)
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{
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swp_entry_t arch_entry;
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unsigned long pteval;
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int present, none;
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pte_t pte;
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if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
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present = pud_present(__pud(rste));
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none = pud_none(__pud(rste));
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} else {
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present = pmd_present(__pmd(rste));
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none = pmd_none(__pmd(rste));
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}
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/*
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* Convert encoding pmd / pud bits pte bits
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* dy..R...I...wr lIR.uswrdy.p
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* empty 00..0...1...00 -> 010.000000.0
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* prot-none, clean, old 00..1...1...00 -> 111.000000.1
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* prot-none, clean, young 01..1...1...00 -> 111.000001.1
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* prot-none, dirty, old 10..1...1...00 -> 111.000010.1
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* prot-none, dirty, young 11..1...1...00 -> 111.000011.1
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* read-only, clean, old 00..1...1...01 -> 111.000100.1
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* read-only, clean, young 01..1...0...01 -> 101.000101.1
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* read-only, dirty, old 10..1...1...01 -> 111.000110.1
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* read-only, dirty, young 11..1...0...01 -> 101.000111.1
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* read-write, clean, old 00..1...1...11 -> 111.001100.1
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* read-write, clean, young 01..1...0...11 -> 101.001101.1
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* read-write, dirty, old 10..0...1...11 -> 110.001110.1
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* read-write, dirty, young 11..0...0...11 -> 100.001111.1
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* HW-bits: R read-only, I invalid
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* SW-bits: p present, y young, d dirty, r read, w write, s special,
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* u unused, l large
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*/
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if (present) {
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pteval = rste & _SEGMENT_ENTRY_ORIGIN_LARGE;
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pteval |= _PAGE_LARGE | _PAGE_PRESENT;
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_READ, _PAGE_READ);
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_WRITE, _PAGE_WRITE);
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_INVALID, _PAGE_INVALID);
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_PROTECT, _PAGE_PROTECT);
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_DIRTY, _PAGE_DIRTY);
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_YOUNG, _PAGE_YOUNG);
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#ifdef CONFIG_MEM_SOFT_DIRTY
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY, _PAGE_SOFT_DIRTY);
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#endif
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pteval |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC, _PAGE_NOEXEC);
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} else if (!none) {
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/* swap rste */
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arch_entry = __rste_to_swp_entry(rste);
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pte = mk_swap_pte(__swp_type_rste(arch_entry), __swp_offset_rste(arch_entry));
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pteval = pte_val(pte);
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} else
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pteval = _PAGE_INVALID;
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return __pte(pteval);
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}
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static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
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{
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struct folio *folio;
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unsigned long size, paddr;
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if (!mm_uses_skeys(mm) ||
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rste & _SEGMENT_ENTRY_INVALID)
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return;
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if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
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folio = page_folio(pud_page(__pud(rste)));
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size = PUD_SIZE;
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paddr = rste & PUD_MASK;
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} else {
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folio = page_folio(pmd_page(__pmd(rste)));
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size = PMD_SIZE;
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paddr = rste & PMD_MASK;
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}
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if (!test_and_set_bit(PG_arch_1, &folio->flags))
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__storage_key_init_range(paddr, paddr + size);
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}
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void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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unsigned long rste;
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rste = __pte_to_rste(pte);
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/* Set correct table type for 2G hugepages */
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
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if (likely(pte_present(pte)))
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rste |= _REGION3_ENTRY_LARGE;
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rste |= _REGION_ENTRY_TYPE_R3;
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} else if (likely(pte_present(pte)))
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rste |= _SEGMENT_ENTRY_LARGE;
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clear_huge_pte_skeys(mm, rste);
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set_pte(ptep, __pte(rste));
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}
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte, unsigned long sz)
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{
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__set_huge_pte_at(mm, addr, ptep, pte);
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}
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pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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return __rste_to_pte(pte_val(*ptep));
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte = huge_ptep_get(mm, addr, ptep);
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pmd_t *pmdp = (pmd_t *) ptep;
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pud_t *pudp = (pud_t *) ptep;
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY));
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else
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pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
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return pte;
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}
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pte_t *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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pgd_t *pgdp;
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p4d_t *p4dp;
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pud_t *pudp;
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pmd_t *pmdp = NULL;
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pgdp = pgd_offset(mm, addr);
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p4dp = p4d_alloc(mm, pgdp, addr);
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if (p4dp) {
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pudp = pud_alloc(mm, p4dp, addr);
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if (pudp) {
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if (sz == PUD_SIZE)
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return (pte_t *) pudp;
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else if (sz == PMD_SIZE)
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pmdp = pmd_alloc(mm, pudp, addr);
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}
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}
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return (pte_t *) pmdp;
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}
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pte_t *huge_pte_offset(struct mm_struct *mm,
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unsigned long addr, unsigned long sz)
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{
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pgd_t *pgdp;
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p4d_t *p4dp;
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pud_t *pudp;
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pmd_t *pmdp = NULL;
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pgdp = pgd_offset(mm, addr);
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if (pgd_present(*pgdp)) {
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p4dp = p4d_offset(pgdp, addr);
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if (p4d_present(*p4dp)) {
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pudp = pud_offset(p4dp, addr);
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if (sz == PUD_SIZE)
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return (pte_t *)pudp;
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if (pud_present(*pudp))
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pmdp = pmd_offset(pudp, addr);
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}
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}
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return (pte_t *) pmdp;
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}
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bool __init arch_hugetlb_valid_size(unsigned long size)
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{
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if (MACHINE_HAS_EDAT1 && size == PMD_SIZE)
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return true;
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else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE)
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return true;
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else
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return false;
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}
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