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403d1338a4
Make pte_swp_exclusive return bool instead of int. This will better reflect how pte_swp_exclusive is actually used in the code. This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper 32-bits of PTE (like on alpha). Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Magnus Lindholm <linmag7@gmail.com> Cc: Sam James <sam@gentoo.org> Link: https://lore.kernel.org/lkml/20250218175735.19882-2-linmag7@gmail.com/ Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/ [ Applied as the 'sed' script Al suggested - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
334 lines
8.7 KiB
C
334 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright 2003 PathScale, Inc.
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* Derived from include/asm-i386/pgtable.h
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*/
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#ifndef __UM_PGTABLE_H
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#define __UM_PGTABLE_H
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#include <asm/page.h>
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#include <linux/mm_types.h>
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#define _PAGE_PRESENT 0x001
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#define _PAGE_NEEDSYNC 0x002
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#define _PAGE_RW 0x020
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#define _PAGE_USER 0x040
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#define _PAGE_ACCESSED 0x080
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#define _PAGE_DIRTY 0x100
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/* If _PAGE_PRESENT is clear, we use these: */
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#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
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pte_present gives true */
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/* We borrow bit 10 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE 0x400
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#if CONFIG_PGTABLE_LEVELS == 4
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#include <asm/pgtable-4level.h>
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#elif CONFIG_PGTABLE_LEVELS == 2
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#include <asm/pgtable-2level.h>
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#else
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#error "Unsupported number of page table levels"
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#endif
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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/* zero page used for uninitialized stuff */
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extern unsigned long *empty_zero_page;
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/* Just any arbitrary offset to the start of the vmalloc VM area: the
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* current 8MB value just means that there will be a 8MB "hole" after the
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* physical memory until the kernel virtual memory starts. That means that
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* any out-of-bounds memory accesses will hopefully be caught.
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* The vmalloc() routines leaves a hole of 4kB between each vmalloced
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* area for the same reason. ;)
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*/
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extern unsigned long end_iomem;
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#define VMALLOC_OFFSET (__va_space)
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#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
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#define VMALLOC_END (TASK_SIZE-2*PAGE_SIZE)
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#define MODULES_VADDR VMALLOC_START
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#define MODULES_END VMALLOC_END
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define __PAGE_KERNEL_EXEC \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
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/*
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* The i386 can't do page protection for execute, and considers that the same
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* are read.
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* Also, write permissions imply read permissions. This is the closest we can
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* get..
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*/
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
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#define pte_clear(mm, addr, xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEEDSYNC))
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#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEEDSYNC))
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#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEEDSYNC; } while (0)
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#define pmd_needsync(x) (pmd_val(x) & _PAGE_NEEDSYNC)
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#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEEDSYNC)
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#define pud_needsync(x) (pud_val(x) & _PAGE_NEEDSYNC)
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#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEEDSYNC)
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#define p4d_needsync(x) (p4d_val(x) & _PAGE_NEEDSYNC)
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#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEEDSYNC)
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#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
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#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
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/*
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* =================================
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* Flags checking section.
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* =================================
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*/
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static inline int pte_none(pte_t pte)
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{
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return pte_is_zero(pte);
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}
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_read(pte_t pte)
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{
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return((pte_get_bits(pte, _PAGE_USER)) &&
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!(pte_get_bits(pte, _PAGE_PROTNONE)));
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}
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static inline int pte_exec(pte_t pte){
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return((pte_get_bits(pte, _PAGE_USER)) &&
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!(pte_get_bits(pte, _PAGE_PROTNONE)));
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}
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static inline int pte_write(pte_t pte)
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{
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return((pte_get_bits(pte, _PAGE_RW)) &&
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!(pte_get_bits(pte, _PAGE_PROTNONE)));
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}
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static inline int pte_dirty(pte_t pte)
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{
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return pte_get_bits(pte, _PAGE_DIRTY);
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_get_bits(pte, _PAGE_ACCESSED);
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}
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static inline int pte_needsync(pte_t pte)
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{
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return pte_get_bits(pte, _PAGE_NEEDSYNC);
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}
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/*
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* =================================
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* Flags setting section.
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* =================================
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*/
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static inline pte_t pte_mkclean(pte_t pte)
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{
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pte_clear_bits(pte, _PAGE_DIRTY);
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return(pte);
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_clear_bits(pte, _PAGE_ACCESSED);
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return(pte);
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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pte_clear_bits(pte, _PAGE_RW);
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return pte;
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}
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static inline pte_t pte_mkread(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_USER);
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return pte;
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_DIRTY);
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return(pte);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_ACCESSED);
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return(pte);
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}
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static inline pte_t pte_mkwrite_novma(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_RW);
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return pte;
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}
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static inline pte_t pte_mkuptodate(pte_t pte)
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{
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pte_clear_bits(pte, _PAGE_NEEDSYNC);
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return pte;
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}
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static inline pte_t pte_mkneedsync(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_NEEDSYNC);
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return(pte);
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}
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static inline void set_pte(pte_t *pteptr, pte_t pteval)
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{
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pte_copy(*pteptr, pteval);
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/* If it's a swap entry, it needs to be marked _PAGE_NEEDSYNC so
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* update_pte_range knows to unmap it.
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*/
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*pteptr = pte_mkneedsync(*pteptr);
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}
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#define PFN_PTE_SHIFT PAGE_SHIFT
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static inline void um_tlb_mark_sync(struct mm_struct *mm, unsigned long start,
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unsigned long end)
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{
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if (!mm->context.sync_tlb_range_to) {
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mm->context.sync_tlb_range_from = start;
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mm->context.sync_tlb_range_to = end;
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} else {
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if (start < mm->context.sync_tlb_range_from)
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mm->context.sync_tlb_range_from = start;
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if (end > mm->context.sync_tlb_range_to)
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mm->context.sync_tlb_range_to = end;
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}
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}
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#define set_ptes set_ptes
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static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte, int nr)
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{
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/* Basically the default implementation */
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size_t length = nr * PAGE_SIZE;
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for (;;) {
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set_pte(ptep, pte);
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if (--nr == 0)
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break;
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ptep++;
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pte = __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
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}
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um_tlb_mark_sync(mm, addr, addr + length);
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}
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#define __HAVE_ARCH_PTE_SAME
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static inline int pte_same(pte_t pte_a, pte_t pte_b)
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{
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return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEEDSYNC);
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}
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#define __virt_to_page(virt) phys_to_page(__pa(virt))
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#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
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static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
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{
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pte_t pte;
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pte_set_val(pte, pfn_to_phys(pfn), pgprot);
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return pte;
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}
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
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return pte;
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}
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/*
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* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
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*
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* this macro returns the index of the entry in the pmd page which would
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* control the given virtual address
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*/
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#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
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struct mm_struct;
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extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
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#define update_mmu_cache(vma,address,ptep) do {} while (0)
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#define update_mmu_cache_range(vmf, vma, address, ptep, nr) do {} while (0)
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTEs:
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*
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* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* <--------------- offset ----------------> E < type -> 0 0 0 1 0
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*
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* E is the exclusive marker that is not stored in swap entries.
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* _PAGE_NEEDSYNC (bit 1) is always set to 1 in set_pte().
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*/
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#define __swp_type(x) (((x).val >> 5) & 0x1f)
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#define __swp_offset(x) ((x).val >> 11)
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#define __swp_entry(type, offset) \
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((swp_entry_t) { (((type) & 0x1f) << 5) | ((offset) << 11) })
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#define __pte_to_swp_entry(pte) \
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((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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static inline bool pte_swp_exclusive(pte_t pte)
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{
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return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE);
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}
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static inline pte_t pte_swp_mkexclusive(pte_t pte)
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{
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pte_set_bits(pte, _PAGE_SWP_EXCLUSIVE);
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return pte;
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}
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static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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{
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pte_clear_bits(pte, _PAGE_SWP_EXCLUSIVE);
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return pte;
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}
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#endif
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