/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __UM_TLB_H #define __UM_TLB_H #include <linux/pagemap.h> #include <linux/swap.h> #include <asm/percpu.h> #include <asm/pgalloc.h> #include <asm/tlbflush.h> #define tlb_start_vma(tlb, vma) do { } while (0) #define tlb_end_vma(tlb, vma) do { } while (0) #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) /* struct mmu_gather is an opaque type used by the mm code for passing around * any data needed by arch specific code for tlb_remove_page. */ struct mmu_gather { struct mm_struct *mm; unsigned int need_flush; /* Really unmapped some ptes? */ unsigned long start; unsigned long end; unsigned int fullmm; /* non-zero means full mm flush */ }; static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) { if (tlb->start > address) tlb->start = address; if (tlb->end < address + PAGE_SIZE) tlb->end = address + PAGE_SIZE; } static inline void init_tlb_gather(struct mmu_gather *tlb) { tlb->need_flush = 0; tlb->start = TASK_SIZE; tlb->end = 0; if (tlb->fullmm) { tlb->start = 0; tlb->end = TASK_SIZE; } } static inline void arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end) { tlb->mm = mm; tlb->start = start; tlb->end = end; tlb->fullmm = !(start | (end+1)); init_tlb_gather(tlb); } extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, unsigned long end); static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) { flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); } static inline void tlb_flush_mmu_free(struct mmu_gather *tlb) { init_tlb_gather(tlb); } static inline void tlb_flush_mmu(struct mmu_gather *tlb) { if (!tlb->need_flush) return; tlb_flush_mmu_tlbonly(tlb); tlb_flush_mmu_free(tlb); } /* arch_tlb_finish_mmu * Called at the end of the shootdown operation to free up any resources * that were required. */ static inline void arch_tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end, bool force) { if (force) { tlb->start = start; tlb->end = end; tlb->need_flush = 1; } tlb_flush_mmu(tlb); /* keep the page table cache within bounds */ check_pgt_cache(); } /* tlb_remove_page * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), * while handling the additional races in SMP caused by other CPUs * caching valid mappings in their TLBs. */ static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) { tlb->need_flush = 1; free_page_and_swap_cache(page); return false; /* avoid calling tlb_flush_mmu */ } static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) { __tlb_remove_page(tlb, page); } static inline bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_size) { return __tlb_remove_page(tlb, page); } static inline void tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_size) { return tlb_remove_page(tlb, page); } static inline void tlb_flush_pmd_range(struct mmu_gather *tlb, unsigned long address, unsigned long size) { tlb->need_flush = 1; if (tlb->start > address) tlb->start = address; if (tlb->end < address + size) tlb->end = address + size; } /** * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. * * Record the fact that pte's were really umapped in ->need_flush, so we can * later optimise away the tlb invalidate. This helps when userspace is * unmapping already-unmapped pages, which happens quite a lot. */ #define tlb_remove_tlb_entry(tlb, ptep, address) \ do { \ tlb->need_flush = 1; \ __tlb_remove_tlb_entry(tlb, ptep, address); \ } while (0) #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ tlb_remove_tlb_entry(tlb, ptep, address) #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, unsigned int page_size) { } #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr) #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) #define tlb_migrate_finish(mm) do {} while (0) #endif
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Kbuild | File | 702 B | 0644 |
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a.out-core.h | File | 695 B | 0644 |
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bugs.h | File | 111 B | 0644 |
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cache.h | File | 483 B | 0644 |
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common.lds.S | File | 1.76 KB | 0644 |
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dma.h | File | 180 B | 0644 |
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fixmap.h | File | 1.63 KB | 0644 |
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hardirq.h | File | 558 B | 0644 |
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io.h | File | 339 B | 0644 |
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irq.h | File | 493 B | 0644 |
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irqflags.h | File | 865 B | 0644 |
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kmap_types.h | File | 219 B | 0644 |
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kvm_para.h | File | 34 B | 0644 |
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mmu.h | File | 558 B | 0644 |
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mmu_context.h | File | 1.87 KB | 0644 |
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page.h | File | 3.15 KB | 0644 |
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pgalloc.h | File | 1.46 KB | 0644 |
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pgtable-2level.h | File | 1.32 KB | 0644 |
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pgtable-3level.h | File | 2.88 KB | 0644 |
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pgtable.h | File | 9.88 KB | 0644 |
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processor-generic.h | File | 1.87 KB | 0644 |
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ptrace-generic.h | File | 1.13 KB | 0644 |
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sections.h | File | 219 B | 0644 |
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setup.h | File | 273 B | 0644 |
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smp.h | File | 121 B | 0644 |
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stacktrace.h | File | 1.06 KB | 0644 |
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syscall-generic.h | File | 2.67 KB | 0644 |
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sysrq.h | File | 182 B | 0644 |
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thread_info.h | File | 2.15 KB | 0644 |
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timex.h | File | 151 B | 0644 |
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tlb.h | File | 4.23 KB | 0644 |
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tlbflush.h | File | 978 B | 0644 |
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uaccess.h | File | 1.65 KB | 0644 |
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unwind.h | File | 213 B | 0644 |
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