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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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15a23ffa2f
tlb_gather_mmu dates from before kernel preemption was allowed, and uses smp_processor_id or __get_cpu_var to find its per-cpu mmu_gather. That works because it's currently only called after getting page_table_lock, which is not dropped until after the matching tlb_finish_mmu. But don't rely on that, it will soon change: now disable preemption internally by proper get_cpu_var in tlb_gather_mmu, put_cpu_var in tlb_finish_mmu. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
#ifndef __ASMARM_TLB_H
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#define __ASMARM_TLB_H
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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/*
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* TLB handling. This allows us to remove pages from the page
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* tables, and efficiently handle the TLB issues.
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*/
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struct mmu_gather {
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struct mm_struct *mm;
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unsigned int freed;
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unsigned int fullmm;
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unsigned int flushes;
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unsigned int avoided_flushes;
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};
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DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
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static inline struct mmu_gather *
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tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
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{
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struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
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tlb->mm = mm;
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tlb->freed = 0;
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tlb->fullmm = full_mm_flush;
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return tlb;
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}
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static inline void
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tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
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{
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struct mm_struct *mm = tlb->mm;
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unsigned long freed = tlb->freed;
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int rss = get_mm_counter(mm, rss);
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if (rss < freed)
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freed = rss;
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add_mm_counter(mm, rss, -freed);
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if (freed) {
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flush_tlb_mm(mm);
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tlb->flushes++;
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} else {
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tlb->avoided_flushes++;
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}
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/* keep the page table cache within bounds */
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check_pgt_cache();
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put_cpu_var(mmu_gathers);
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}
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static inline unsigned int
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tlb_is_full_mm(struct mmu_gather *tlb)
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{
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return tlb->fullmm;
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}
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#define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0)
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//#define tlb_start_vma(tlb,vma) do { } while (0)
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//FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
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#define tlb_start_vma(tlb,vma) \
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do { \
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if (!tlb->fullmm) \
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flush_cache_range(vma, vma->vm_start, vma->vm_end); \
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} while (0)
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#define tlb_end_vma(tlb,vma) do { } while (0)
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#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page)
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#define pte_free_tlb(tlb,ptep) pte_free(ptep)
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#define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp)
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#endif
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