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https://github.com/torvalds/linux
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db3eb96f4e
Add needed pmd mangling functions with symmetry with their pte counterparts. pmdp_splitting_flush() is the only new addition on the pmd_ methods and it's needed to serialize the VM against split_huge_page. It simply atomically sets the splitting bit in a similar way pmdp_clear_flush_young atomically clears the accessed bit. pmdp_splitting_flush() also has to flush the tlb to make it effective against gup_fast, but it wouldn't really require to flush the tlb too. Just the tlb flush is the simplest operation we can invoke to serialize pmdp_splitting_flush() against gup_fast. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
292 lines
7.1 KiB
C
292 lines
7.1 KiB
C
#ifndef _ASM_X86_PGTABLE_64_H
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#define _ASM_X86_PGTABLE_64_H
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#include <linux/const.h>
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#include <asm/pgtable_64_types.h>
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#ifndef __ASSEMBLY__
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/*
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* This file contains the functions and defines necessary to modify and use
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* the x86-64 page table tree.
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*/
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#include <asm/processor.h>
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#include <linux/bitops.h>
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#include <linux/threads.h>
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extern pud_t level3_kernel_pgt[512];
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extern pud_t level3_ident_pgt[512];
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extern pmd_t level2_kernel_pgt[512];
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extern pmd_t level2_fixmap_pgt[512];
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extern pmd_t level2_ident_pgt[512];
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extern pgd_t init_level4_pgt[];
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#define swapper_pg_dir init_level4_pgt
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extern void paging_init(void);
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pmd_val(e))
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pud_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pgd_val(e))
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struct mm_struct;
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void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
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static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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*ptep = native_make_pte(0);
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}
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static inline void native_set_pte(pte_t *ptep, pte_t pte)
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{
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*ptep = pte;
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}
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static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
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{
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native_set_pte(ptep, pte);
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}
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static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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}
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static inline void native_pmd_clear(pmd_t *pmd)
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{
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native_set_pmd(pmd, native_make_pmd(0));
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}
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static inline pte_t native_ptep_get_and_clear(pte_t *xp)
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{
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#ifdef CONFIG_SMP
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return native_make_pte(xchg(&xp->pte, 0));
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#else
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/* native_local_ptep_get_and_clear,
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but duplicated because of cyclic dependency */
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pte_t ret = *xp;
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native_pte_clear(NULL, 0, xp);
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return ret;
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#endif
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}
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static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
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{
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#ifdef CONFIG_SMP
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return native_make_pmd(xchg(&xp->pmd, 0));
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#else
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/* native_local_pmdp_get_and_clear,
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but duplicated because of cyclic dependency */
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pmd_t ret = *xp;
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native_pmd_clear(xp);
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return ret;
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#endif
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}
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static inline void native_set_pud(pud_t *pudp, pud_t pud)
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{
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*pudp = pud;
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}
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static inline void native_pud_clear(pud_t *pud)
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{
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native_set_pud(pud, native_make_pud(0));
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}
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static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
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{
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*pgdp = pgd;
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}
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static inline void native_pgd_clear(pgd_t *pgd)
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{
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native_set_pgd(pgd, native_make_pgd(0));
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}
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extern void sync_global_pgds(unsigned long start, unsigned long end);
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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/*
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* Level 4 access.
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*/
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static inline int pgd_large(pgd_t pgd) { return 0; }
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#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
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/* PUD - Level3 access */
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/* PMD - Level 2 access */
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#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
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#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
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_PAGE_FILE })
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#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
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/* PTE - Level 1 access. */
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/* x86-64 always has all page tables mapped. */
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#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
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#define pte_unmap(pte) ((void)(pte))/* NOP */
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#define update_mmu_cache(vma, address, ptep) do { } while (0)
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/* Encode and de-code a swap entry */
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#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
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#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
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#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
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#else
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#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
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#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
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#endif
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#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
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#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
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& ((1U << SWP_TYPE_BITS) - 1))
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#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
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#define __swp_entry(type, offset) ((swp_entry_t) { \
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((type) << (_PAGE_BIT_PRESENT + 1)) \
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| ((offset) << SWP_OFFSET_SHIFT) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
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#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
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extern int kern_addr_valid(unsigned long addr);
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extern void cleanup_highmap(void);
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#define HAVE_ARCH_UNMAPPED_AREA
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#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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#define pgtable_cache_init() do { } while (0)
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#define check_pgt_cache() do { } while (0)
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#define PAGE_AGP PAGE_KERNEL_NOCACHE
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#define HAVE_PAGE_AGP 1
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/* fs/proc/kcore.c */
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#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
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#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
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#define __HAVE_ARCH_PTE_SAME
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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static inline int pmd_trans_splitting(pmd_t pmd)
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{
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return pmd_val(pmd) & _PAGE_SPLITTING;
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}
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static inline int pmd_trans_huge(pmd_t pmd)
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{
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return pmd_val(pmd) & _PAGE_PSE;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
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#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
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extern int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty);
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#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
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extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long addr, pmd_t *pmdp);
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#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
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extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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extern void pmdp_splitting_flush(struct vm_area_struct *vma,
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unsigned long addr, pmd_t *pmdp);
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#define __HAVE_ARCH_PMD_WRITE
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static inline int pmd_write(pmd_t pmd)
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{
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return pmd_flags(pmd) & _PAGE_RW;
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}
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#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
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static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp)
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{
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pmd_t pmd = native_pmdp_get_and_clear(pmdp);
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pmd_update(mm, addr, pmdp);
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return pmd;
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}
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#define __HAVE_ARCH_PMDP_SET_WRPROTECT
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static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pmd_t *pmdp)
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{
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clear_bit(_PAGE_BIT_RW, (unsigned long *)&pmdp->pmd);
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pmd_update(mm, addr, pmdp);
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}
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static inline int pmd_young(pmd_t pmd)
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{
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return pmd_flags(pmd) & _PAGE_ACCESSED;
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}
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static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
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{
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pmdval_t v = native_pmd_val(pmd);
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return native_make_pmd(v | set);
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}
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static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
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{
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pmdval_t v = native_pmd_val(pmd);
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return native_make_pmd(v & ~clear);
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}
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static inline pmd_t pmd_mkold(pmd_t pmd)
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{
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return pmd_clear_flags(pmd, _PAGE_ACCESSED);
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}
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static inline pmd_t pmd_wrprotect(pmd_t pmd)
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{
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return pmd_clear_flags(pmd, _PAGE_RW);
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}
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static inline pmd_t pmd_mkdirty(pmd_t pmd)
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{
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return pmd_set_flags(pmd, _PAGE_DIRTY);
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}
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static inline pmd_t pmd_mkhuge(pmd_t pmd)
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{
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return pmd_set_flags(pmd, _PAGE_PSE);
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}
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static inline pmd_t pmd_mkyoung(pmd_t pmd)
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{
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return pmd_set_flags(pmd, _PAGE_ACCESSED);
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}
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static inline pmd_t pmd_mkwrite(pmd_t pmd)
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{
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return pmd_set_flags(pmd, _PAGE_RW);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_PGTABLE_64_H */
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