forked from Minki/linux
020c1427f3
Over the past couple of years, the generic mmu_gather gained range tracking -597e1c3580(mm/mmu_gather: enable tlb flush range in generic mmu_gather),2b047252d0(Fix TLB gather virtual address range invalidation corner cases) - and tlb_fast_mode() has been removed -29eb77825c(arch, mm: Remove tlb_fast_mode()). The new mmu_gather structure is now suitable for arm64 and this patch converts the arch asm/tlb.h to the generic code. One functional difference is the shift_arg_pages() case where previously the code was flushing the full mm (no tlb_start_vma call) but now it flushes the range given to tlb_gather_mmu() (possibly slightly more efficient previously). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Peter Zijlstra <peterz@infradead.org>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 <asm-generic/tlb.h>
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/*
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* There's three ways the TLB shootdown code is used:
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* 1. Unmapping a range of vmas. See zap_page_range(), unmap_region().
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* tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
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* 2. Unmapping all vmas. See exit_mmap().
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* tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
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* Page tables will be freed.
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* 3. Unmapping argument pages. See shift_arg_pages().
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* tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
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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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if (tlb->fullmm) {
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flush_tlb_mm(tlb->mm);
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} else if (tlb->end > 0) {
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struct vm_area_struct vma = { .vm_mm = tlb->mm, };
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flush_tlb_range(&vma, tlb->start, tlb->end);
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tlb->start = TASK_SIZE;
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tlb->end = 0;
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}
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}
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static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
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{
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if (!tlb->fullmm) {
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tlb->start = min(tlb->start, addr);
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tlb->end = max(tlb->end, addr + PAGE_SIZE);
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}
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}
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/*
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* Memorize the range for the TLB flush.
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*/
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static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
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unsigned long addr)
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{
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tlb_add_flush(tlb, addr);
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}
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/*
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* In the case of tlb vma handling, we can optimise these away in the
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* case where we're doing a full MM flush. When we're doing a munmap,
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* the vmas are adjusted to only cover the region to be torn down.
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*/
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static inline void tlb_start_vma(struct mmu_gather *tlb,
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struct vm_area_struct *vma)
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{
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if (!tlb->fullmm) {
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tlb->start = TASK_SIZE;
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tlb->end = 0;
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}
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}
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static inline void tlb_end_vma(struct mmu_gather *tlb,
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struct vm_area_struct *vma)
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{
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if (!tlb->fullmm)
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tlb_flush(tlb);
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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_page_dtor(pte);
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tlb_add_flush(tlb, addr);
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tlb_remove_page(tlb, pte);
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}
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#ifndef CONFIG_ARM64_64K_PAGES
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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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tlb_add_flush(tlb, addr);
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tlb_remove_page(tlb, virt_to_page(pmdp));
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}
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#endif
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#endif
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