dcc17d1bae
Corrects the very inefficent method of finding free context_ids in get_mmu_context(). Instead of walking the task_list of all processes, 2 bitmaps are used to efficently store and lookup state, inuse and needs flushing. The entire rid address space is now used before calling wrap_mmu_context and global tlb flushing. Special thanks to Ken and Rohit for their review and modifications in using a bit flushmap. Signed-off-by: Peter Keilty <peter.keilty@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
#ifndef _ASM_IA64_TLBFLUSH_H
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#define _ASM_IA64_TLBFLUSH_H
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/*
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* Copyright (C) 2002 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/config.h>
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#include <linux/mm.h>
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#include <asm/intrinsics.h>
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#include <asm/mmu_context.h>
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#include <asm/page.h>
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/*
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* Now for some TLB flushing routines. This is the kind of stuff that
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* can be very expensive, so try to avoid them whenever possible.
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*/
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/*
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* Flush everything (kernel mapping may also have changed due to
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* vmalloc/vfree).
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*/
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extern void local_flush_tlb_all (void);
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#ifdef CONFIG_SMP
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extern void smp_flush_tlb_all (void);
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extern void smp_flush_tlb_mm (struct mm_struct *mm);
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# define flush_tlb_all() smp_flush_tlb_all()
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#else
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# define flush_tlb_all() local_flush_tlb_all()
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#endif
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static inline void
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local_finish_flush_tlb_mm (struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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activate_context(mm);
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}
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/*
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* Flush a specified user mapping. This is called, e.g., as a result of fork() and
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* exit(). fork() ends up here because the copy-on-write mechanism needs to write-protect
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* the PTEs of the parent task.
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*/
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static inline void
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flush_tlb_mm (struct mm_struct *mm)
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{
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if (!mm)
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return;
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set_bit(mm->context, ia64_ctx.flushmap);
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mm->context = 0;
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if (atomic_read(&mm->mm_users) == 0)
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return; /* happens as a result of exit_mmap() */
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#ifdef CONFIG_SMP
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smp_flush_tlb_mm(mm);
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#else
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local_finish_flush_tlb_mm(mm);
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#endif
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}
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extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
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/*
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* Page-granular tlb flush.
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*/
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static inline void
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flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
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{
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#ifdef CONFIG_SMP
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flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
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#else
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if (vma->vm_mm == current->active_mm)
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ia64_ptcl(addr, (PAGE_SHIFT << 2));
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else
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vma->vm_mm->context = 0;
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#endif
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}
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/*
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* Flush the TLB entries mapping the virtually mapped linear page
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* table corresponding to address range [START-END).
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*/
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static inline void
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flush_tlb_pgtables (struct mm_struct *mm, unsigned long start, unsigned long end)
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{
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/*
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* Deprecated. The virtual page table is now flushed via the normal gather/flush
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* interface (see tlb.h).
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*/
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}
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#define flush_tlb_kernel_range(start, end) flush_tlb_all() /* XXX fix me */
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#endif /* _ASM_IA64_TLBFLUSH_H */
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