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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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fb7332a9fe
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>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* TLB shootdown specifics for powerpc
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*
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* Copyright (C) 2002 Anton Blanchard, IBM Corp.
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* Copyright (C) 2002 Paul Mackerras, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_POWERPC_TLB_H
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#define _ASM_POWERPC_TLB_H
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#ifdef __KERNEL__
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#ifndef __powerpc64__
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#include <asm/pgtable.h>
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#endif
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#ifndef __powerpc64__
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#include <asm/page.h>
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#include <asm/mmu.h>
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#endif
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#include <linux/pagemap.h>
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#define tlb_start_vma(tlb, vma) do { } while (0)
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#define tlb_end_vma(tlb, vma) do { } while (0)
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#define __tlb_remove_tlb_entry __tlb_remove_tlb_entry
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extern void tlb_flush(struct mmu_gather *tlb);
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/* Get the generic bits... */
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#include <asm-generic/tlb.h>
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extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
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unsigned long address);
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static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
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unsigned long address)
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{
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#ifdef CONFIG_PPC_STD_MMU_32
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if (pte_val(*ptep) & _PAGE_HASHPTE)
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flush_hash_entry(tlb->mm, ptep, address);
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#endif
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_POWERPC_TLB_H */
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