kernel-ark/include/asm-ia64/tlbflush.h
Peter Keilty dcc17d1bae [IA64] Use bitmaps for efficient context allocation/free
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>
2005-10-31 14:36:05 -08:00

101 lines
2.3 KiB
C

#ifndef _ASM_IA64_TLBFLUSH_H
#define _ASM_IA64_TLBFLUSH_H
/*
* Copyright (C) 2002 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
#include <linux/config.h>
#include <linux/mm.h>
#include <asm/intrinsics.h>
#include <asm/mmu_context.h>
#include <asm/page.h>
/*
* Now for some TLB flushing routines. This is the kind of stuff that
* can be very expensive, so try to avoid them whenever possible.
*/
/*
* Flush everything (kernel mapping may also have changed due to
* vmalloc/vfree).
*/
extern void local_flush_tlb_all (void);
#ifdef CONFIG_SMP
extern void smp_flush_tlb_all (void);
extern void smp_flush_tlb_mm (struct mm_struct *mm);
# define flush_tlb_all() smp_flush_tlb_all()
#else
# define flush_tlb_all() local_flush_tlb_all()
#endif
static inline void
local_finish_flush_tlb_mm (struct mm_struct *mm)
{
if (mm == current->active_mm)
activate_context(mm);
}
/*
* Flush a specified user mapping. This is called, e.g., as a result of fork() and
* exit(). fork() ends up here because the copy-on-write mechanism needs to write-protect
* the PTEs of the parent task.
*/
static inline void
flush_tlb_mm (struct mm_struct *mm)
{
if (!mm)
return;
set_bit(mm->context, ia64_ctx.flushmap);
mm->context = 0;
if (atomic_read(&mm->mm_users) == 0)
return; /* happens as a result of exit_mmap() */
#ifdef CONFIG_SMP
smp_flush_tlb_mm(mm);
#else
local_finish_flush_tlb_mm(mm);
#endif
}
extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
/*
* Page-granular tlb flush.
*/
static inline void
flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
{
#ifdef CONFIG_SMP
flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
#else
if (vma->vm_mm == current->active_mm)
ia64_ptcl(addr, (PAGE_SHIFT << 2));
else
vma->vm_mm->context = 0;
#endif
}
/*
* Flush the TLB entries mapping the virtually mapped linear page
* table corresponding to address range [START-END).
*/
static inline void
flush_tlb_pgtables (struct mm_struct *mm, unsigned long start, unsigned long end)
{
/*
* Deprecated. The virtual page table is now flushed via the normal gather/flush
* interface (see tlb.h).
*/
}
#define flush_tlb_kernel_range(start, end) flush_tlb_all() /* XXX fix me */
#endif /* _ASM_IA64_TLBFLUSH_H */