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On architectures with hardware broadcasting of TLB invalidation messages , it makes sense to reduce the range of the mmu_gather structure when unmapping page ranges based on the dirty address information passed to tlb_remove_tlb_entry. arm64 already does this by directly manipulating the start/end fields of the gather structure, but this confuses the generic code which does not expect these fields to change and can end up calculating invalid, negative ranges when forcing a flush in zap_pte_range. This patch moves the minimal range calculation out of the arm64 code and into the generic implementation, simplifying zap_pte_range in the process (which no longer needs to care about start/end, since they will point to the appropriate ranges already). With the range being tracked by core code, the need_flush flag is dropped in favour of checking that the end of the range has actually been set. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Michal Simek <monstr@monstr.eu> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
72 lines
1.9 KiB
C
72 lines
1.9 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 <linux/pagemap.h>
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#include <linux/swap.h>
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#ifdef CONFIG_HAVE_RCU_TABLE_FREE
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#define tlb_remove_entry(tlb, entry) tlb_remove_table(tlb, entry)
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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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#else
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#define tlb_remove_entry(tlb, entry) tlb_remove_page(tlb, entry)
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#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
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#include <asm-generic/tlb.h>
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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 {
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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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}
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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_remove_entry(tlb, pte);
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}
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#if CONFIG_ARM64_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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tlb_remove_entry(tlb, virt_to_page(pmdp));
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}
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#endif
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#if CONFIG_ARM64_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_entry(tlb, virt_to_page(pudp));
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}
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#endif
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#endif
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