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[MIPS] Avoid interprocessor function calls.

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On the 34K where multiple virtual processors are implemented in a single
core and share a single TLB, interprocessor function calls are not needed
to flush a cache, so avoid them.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2006-06-22 22:42:32 +01:00
parent f1aaee53f2
commit 25969354a3
1 changed files with 30 additions and 5 deletions
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35
arch/mips/kernel/smp.c
View file

@ -318,6 +318,32 @@ static void flush_tlb_mm_ipi(void *mm)
local_flush_tlb_mm((struct mm_struct *)mm);
}
/*
* Special Variant of smp_call_function for use by TLB functions:
*
* o No return value
* o collapses to normal function call on UP kernels
* o collapses to normal function call on systems with a single shared
* primary cache.
* o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
*/
static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
{
#ifndef CONFIG_MIPS_MT_SMTC
smp_call_function(func, info, 1, 1);
#endif
}
static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
{
preempt_disable();
smp_on_other_tlbs(func, info);
func(info);
preempt_enable();
}
/*
* The following tlb flush calls are invoked when old translations are
* being torn down, or pte attributes are changing. For single threaded
@ -336,7 +362,7 @@ void flush_tlb_mm(struct mm_struct *mm)
preempt_disable();
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1, 1);
smp_on_other_tlbs(flush_tlb_mm_ipi, (void *)mm);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@ -372,7 +398,7 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned l
fd.vma = vma;
fd.addr1 = start;
fd.addr2 = end;
smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1, 1);
smp_on_other_tlbs(flush_tlb_range_ipi, (void *)&fd);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@ -414,7 +440,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
fd.vma = vma;
fd.addr1 = page;
smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1, 1);
smp_on_other_tlbs(flush_tlb_page_ipi, (void *)&fd);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@ -434,8 +460,7 @@ static void flush_tlb_one_ipi(void *info)
void flush_tlb_one(unsigned long vaddr)
{
smp_call_function(flush_tlb_one_ipi, (void *) vaddr, 1, 1);
local_flush_tlb_one(vaddr);
smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
}
static DEFINE_PER_CPU(struct cpu, cpu_devices);