159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/* arch/sparc64/mm/tlb.c
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*
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* Copyright (C) 2004 David S. Miller <davem@redhat.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/percpu.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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/* Heavily inspired by the ppc64 code. */
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers) =
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{ NULL, 0, 0, 0, 0, 0, { 0 }, { NULL }, };
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void flush_tlb_pending(void)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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if (mp->tlb_nr) {
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unsigned long context = mp->mm->context;
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if (CTX_VALID(context)) {
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#ifdef CONFIG_SMP
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smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
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&mp->vaddrs[0]);
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#else
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__flush_tlb_pending(CTX_HWBITS(context), mp->tlb_nr,
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&mp->vaddrs[0]);
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#endif
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}
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mp->tlb_nr = 0;
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}
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}
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void tlb_batch_add(pte_t *ptep, pte_t orig)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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struct page *ptepage;
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struct mm_struct *mm;
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unsigned long vaddr, nr;
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ptepage = virt_to_page(ptep);
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mm = (struct mm_struct *) ptepage->mapping;
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/* It is more efficient to let flush_tlb_kernel_range()
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* handle these cases.
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*/
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if (mm == &init_mm)
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return;
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vaddr = ptepage->index +
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(((unsigned long)ptep & ~PAGE_MASK) * PTRS_PER_PTE);
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if (pte_exec(orig))
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vaddr |= 0x1UL;
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if (pte_dirty(orig)) {
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unsigned long paddr, pfn = pte_pfn(orig);
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struct address_space *mapping;
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struct page *page;
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if (!pfn_valid(pfn))
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goto no_cache_flush;
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page = pfn_to_page(pfn);
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if (PageReserved(page))
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goto no_cache_flush;
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/* A real file page? */
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mapping = page_mapping(page);
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if (!mapping)
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goto no_cache_flush;
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paddr = (unsigned long) page_address(page);
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if ((paddr ^ vaddr) & (1 << 13))
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flush_dcache_page_all(mm, page);
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}
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no_cache_flush:
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if (mp->tlb_frozen)
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return;
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nr = mp->tlb_nr;
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if (unlikely(nr != 0 && mm != mp->mm)) {
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flush_tlb_pending();
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nr = 0;
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}
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if (nr == 0)
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mp->mm = mm;
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mp->vaddrs[nr] = vaddr;
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mp->tlb_nr = ++nr;
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if (nr >= TLB_BATCH_NR)
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flush_tlb_pending();
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}
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void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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unsigned long nr = mp->tlb_nr;
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long s = start, e = end, vpte_base;
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if (mp->tlb_frozen)
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return;
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/* Nobody should call us with start below VM hole and end above.
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* See if it is really true.
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*/
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BUG_ON(s > e);
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#if 0
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/* Currently free_pgtables guarantees this. */
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s &= PMD_MASK;
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e = (e + PMD_SIZE - 1) & PMD_MASK;
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#endif
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vpte_base = (tlb_type == spitfire ?
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VPTE_BASE_SPITFIRE :
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VPTE_BASE_CHEETAH);
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if (unlikely(nr != 0 && mm != mp->mm)) {
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flush_tlb_pending();
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nr = 0;
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}
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if (nr == 0)
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mp->mm = mm;
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start = vpte_base + (s >> (PAGE_SHIFT - 3));
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end = vpte_base + (e >> (PAGE_SHIFT - 3));
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while (start < end) {
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mp->vaddrs[nr] = start;
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mp->tlb_nr = ++nr;
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if (nr >= TLB_BATCH_NR) {
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flush_tlb_pending();
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nr = 0;
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}
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start += PAGE_SIZE;
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}
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if (nr)
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flush_tlb_pending();
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}
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unsigned long __ptrs_per_pmd(void)
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{
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if (test_thread_flag(TIF_32BIT))
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return (1UL << (32 - (PAGE_SHIFT-3) - PAGE_SHIFT));
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return REAL_PTRS_PER_PMD;
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}
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