diff options
Diffstat (limited to 'include/asm-generic/pgtable.h')
| -rw-r--r-- | include/asm-generic/pgtable.h | 307 |
1 files changed, 288 insertions, 19 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index b36ce40bd1c..53b2acc3821 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -7,6 +7,16 @@ #include <linux/mm_types.h> #include <linux/bug.h> +/* + * On almost all architectures and configurations, 0 can be used as the + * upper ceiling to free_pgtables(): on many architectures it has the same + * effect as using TASK_SIZE. However, there is one configuration which + * must impose a more careful limit, to avoid freeing kernel pgtables. + */ +#ifndef USER_PGTABLES_CEILING +#define USER_PGTABLES_CEILING 0UL +#endif + #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, pte_t *ptep, @@ -163,11 +173,12 @@ extern void pmdp_splitting_flush(struct vm_area_struct *vma, #endif #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT -extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable); +extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, + pgtable_t pgtable); #endif #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW -extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm); +extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); #endif #ifndef __HAVE_ARCH_PMDP_INVALIDATE @@ -182,6 +193,19 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b) } #endif +#ifndef __HAVE_ARCH_PTE_UNUSED +/* + * Some architectures provide facilities to virtualization guests + * so that they can flag allocated pages as unused. This allows the + * host to transparently reclaim unused pages. This function returns + * whether the pte's page is unused. + */ +static inline int pte_unused(pte_t pte) +{ + return 0; +} +#endif + #ifndef __HAVE_ARCH_PMD_SAME #ifdef CONFIG_TRANSPARENT_HUGEPAGE static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) @@ -197,20 +221,6 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif -#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY -#define page_test_and_clear_dirty(pfn, mapped) (0) -#endif - -#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY -#define pte_maybe_dirty(pte) pte_dirty(pte) -#else -#define pte_maybe_dirty(pte) (1) -#endif - -#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG -#define page_test_and_clear_young(pfn) (0) -#endif - #ifndef __HAVE_ARCH_PGD_OFFSET_GATE #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) #endif @@ -219,6 +229,14 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) #define move_pte(pte, prot, old_addr, new_addr) (pte) #endif +#ifndef pte_accessible +# define pte_accessible(mm, pte) ((void)(pte), 1) +#endif + +#ifndef pte_present_nonuma +#define pte_present_nonuma(pte) pte_present(pte) +#endif + #ifndef flush_tlb_fix_spurious_fault #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) #endif @@ -392,6 +410,58 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm, #define arch_start_context_switch(prev) do {} while (0) #endif +#ifndef CONFIG_HAVE_ARCH_SOFT_DIRTY +static inline int pte_soft_dirty(pte_t pte) +{ + return 0; +} + +static inline int pmd_soft_dirty(pmd_t pmd) +{ + return 0; +} + +static inline pte_t pte_mksoft_dirty(pte_t pte) +{ + return pte; +} + +static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) +{ + return pmd; +} + +static inline pte_t pte_swp_mksoft_dirty(pte_t pte) +{ + return pte; +} + +static inline int pte_swp_soft_dirty(pte_t pte) +{ + return 0; +} + +static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) +{ + return pte; +} + +static inline pte_t pte_file_clear_soft_dirty(pte_t pte) +{ + return pte; +} + +static inline pte_t pte_file_mksoft_dirty(pte_t pte) +{ + return pte; +} + +static inline int pte_file_soft_dirty(pte_t pte) +{ + return 0; +} +#endif + #ifndef __HAVE_PFNMAP_TRACKING /* * Interfaces that can be used by architecture code to keep track of @@ -449,6 +519,30 @@ extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, unsigned long size); #endif +#ifdef __HAVE_COLOR_ZERO_PAGE +static inline int is_zero_pfn(unsigned long pfn) +{ + extern unsigned long zero_pfn; + unsigned long offset_from_zero_pfn = pfn - zero_pfn; + return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); +} + +#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) + +#else +static inline int is_zero_pfn(unsigned long pfn) +{ + extern unsigned long zero_pfn; + return pfn == zero_pfn; +} + +static inline unsigned long my_zero_pfn(unsigned long addr) +{ + extern unsigned long zero_pfn; + return zero_pfn; +} +#endif + #ifdef CONFIG_MMU #ifndef CONFIG_TRANSPARENT_HUGEPAGE @@ -481,6 +575,18 @@ static inline pmd_t pmd_read_atomic(pmd_t *pmdp) } #endif +#ifndef pmd_move_must_withdraw +static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl, + spinlock_t *old_pmd_ptl) +{ + /* + * With split pmd lock we also need to move preallocated + * PTE page table if new_pmd is on different PMD page table. + */ + return new_pmd_ptl != old_pmd_ptl; +} +#endif + /* * This function is meant to be used by sites walking pagetables with * the mmap_sem hold in read mode to protect against MADV_DONTNEED and @@ -522,11 +628,10 @@ static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) #ifdef CONFIG_TRANSPARENT_HUGEPAGE barrier(); #endif - if (pmd_none(pmdval)) + if (pmd_none(pmdval) || pmd_trans_huge(pmdval)) return 1; if (unlikely(pmd_bad(pmdval))) { - if (!pmd_trans_huge(pmdval)) - pmd_clear_bad(pmd); + pmd_clear_bad(pmd); return 1; } return 0; @@ -554,8 +659,172 @@ static inline int pmd_trans_unstable(pmd_t *pmd) #endif } +#ifdef CONFIG_NUMA_BALANCING +#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE +/* + * _PAGE_NUMA works identical to _PAGE_PROTNONE (it's actually the + * same bit too). It's set only when _PAGE_PRESET is not set and it's + * never set if _PAGE_PRESENT is set. + * + * pte/pmd_present() returns true if pte/pmd_numa returns true. Page + * fault triggers on those regions if pte/pmd_numa returns true + * (because _PAGE_PRESENT is not set). + */ +#ifndef pte_numa +static inline int pte_numa(pte_t pte) +{ + return (pte_flags(pte) & + (_PAGE_NUMA|_PAGE_PROTNONE|_PAGE_PRESENT)) == _PAGE_NUMA; +} +#endif + +#ifndef pmd_numa +static inline int pmd_numa(pmd_t pmd) +{ + return (pmd_flags(pmd) & + (_PAGE_NUMA|_PAGE_PROTNONE|_PAGE_PRESENT)) == _PAGE_NUMA; +} +#endif + +/* + * pte/pmd_mknuma sets the _PAGE_ACCESSED bitflag automatically + * because they're called by the NUMA hinting minor page fault. If we + * wouldn't set the _PAGE_ACCESSED bitflag here, the TLB miss handler + * would be forced to set it later while filling the TLB after we + * return to userland. That would trigger a second write to memory + * that we optimize away by setting _PAGE_ACCESSED here. + */ +#ifndef pte_mknonnuma +static inline pte_t pte_mknonnuma(pte_t pte) +{ + pteval_t val = pte_val(pte); + + val &= ~_PAGE_NUMA; + val |= (_PAGE_PRESENT|_PAGE_ACCESSED); + return __pte(val); +} +#endif + +#ifndef pmd_mknonnuma +static inline pmd_t pmd_mknonnuma(pmd_t pmd) +{ + pmdval_t val = pmd_val(pmd); + + val &= ~_PAGE_NUMA; + val |= (_PAGE_PRESENT|_PAGE_ACCESSED); + + return __pmd(val); +} +#endif + +#ifndef pte_mknuma +static inline pte_t pte_mknuma(pte_t pte) +{ + pteval_t val = pte_val(pte); + + val &= ~_PAGE_PRESENT; + val |= _PAGE_NUMA; + + return __pte(val); +} +#endif + +#ifndef ptep_set_numa +static inline void ptep_set_numa(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + pte_t ptent = *ptep; + + ptent = pte_mknuma(ptent); + set_pte_at(mm, addr, ptep, ptent); + return; +} +#endif + +#ifndef pmd_mknuma +static inline pmd_t pmd_mknuma(pmd_t pmd) +{ + pmdval_t val = pmd_val(pmd); + + val &= ~_PAGE_PRESENT; + val |= _PAGE_NUMA; + + return __pmd(val); +} +#endif + +#ifndef pmdp_set_numa +static inline void pmdp_set_numa(struct mm_struct *mm, unsigned long addr, + pmd_t *pmdp) +{ + pmd_t pmd = *pmdp; + + pmd = pmd_mknuma(pmd); + set_pmd_at(mm, addr, pmdp, pmd); + return; +} +#endif +#else +extern int pte_numa(pte_t pte); +extern int pmd_numa(pmd_t pmd); +extern pte_t pte_mknonnuma(pte_t pte); +extern pmd_t pmd_mknonnuma(pmd_t pmd); +extern pte_t pte_mknuma(pte_t pte); +extern pmd_t pmd_mknuma(pmd_t pmd); +extern void ptep_set_numa(struct mm_struct *mm, unsigned long addr, pte_t *ptep); +extern void pmdp_set_numa(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp); +#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */ +#else +static inline int pmd_numa(pmd_t pmd) +{ + return 0; +} + +static inline int pte_numa(pte_t pte) +{ + return 0; +} + +static inline pte_t pte_mknonnuma(pte_t pte) +{ + return pte; +} + +static inline pmd_t pmd_mknonnuma(pmd_t pmd) +{ + return pmd; +} + +static inline pte_t pte_mknuma(pte_t pte) +{ + return pte; +} + +static inline void ptep_set_numa(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + return; +} + + +static inline pmd_t pmd_mknuma(pmd_t pmd) +{ + return pmd; +} + +static inline void pmdp_set_numa(struct mm_struct *mm, unsigned long addr, + pmd_t *pmdp) +{ + return ; +} +#endif /* CONFIG_NUMA_BALANCING */ + #endif /* CONFIG_MMU */ #endif /* !__ASSEMBLY__ */ +#ifndef io_remap_pfn_range +#define io_remap_pfn_range remap_pfn_range +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ |