102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/tlb.h
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*
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* Copyright (C) 2002 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_TLB_H
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#define __ASM_TLB_H
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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static inline void __tlb_remove_table(void *_table)
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{
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free_page_and_swap_cache((struct page *)_table);
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}
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#define tlb_flush tlb_flush
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static void tlb_flush(struct mmu_gather *tlb);
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#include <asm-generic/tlb.h>
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/*
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* get the tlbi levels in arm64. Default value is 0 if more than one
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* of cleared_* is set or neither is set.
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* Arm64 doesn't support p4ds now.
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*/
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static inline int tlb_get_level(struct mmu_gather *tlb)
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{
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/* The TTL field is only valid for the leaf entry. */
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if (tlb->freed_tables)
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return 0;
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if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
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tlb->cleared_puds ||
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tlb->cleared_p4ds))
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return 3;
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if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
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tlb->cleared_puds ||
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tlb->cleared_p4ds))
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return 2;
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if (tlb->cleared_puds && !(tlb->cleared_ptes ||
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tlb->cleared_pmds ||
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tlb->cleared_p4ds))
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return 1;
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return 0;
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}
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static inline void tlb_flush(struct mmu_gather *tlb)
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{
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struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
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bool last_level = !tlb->freed_tables;
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unsigned long stride = tlb_get_unmap_size(tlb);
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int tlb_level = tlb_get_level(tlb);
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/*
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* If we're tearing down the address space then we only care about
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* invalidating the walk-cache, since the ASID allocator won't
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* reallocate our ASID without invalidating the entire TLB.
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*/
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if (tlb->fullmm) {
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if (!last_level)
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flush_tlb_mm(tlb->mm);
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return;
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}
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__flush_tlb_range(&vma, tlb->start, tlb->end, stride,
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last_level, tlb_level);
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}
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
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unsigned long addr)
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{
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pgtable_pte_page_dtor(pte);
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tlb_remove_table(tlb, pte);
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}
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#if CONFIG_PGTABLE_LEVELS > 2
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static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
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unsigned long addr)
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{
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struct page *page = virt_to_page(pmdp);
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pgtable_pmd_page_dtor(page);
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tlb_remove_table(tlb, page);
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}
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#endif
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#if CONFIG_PGTABLE_LEVELS > 3
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static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
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unsigned long addr)
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{
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tlb_remove_table(tlb, virt_to_page(pudp));
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}
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#endif
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#endif
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