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s390/mm: no local TLB flush for clearing-by-ASCE IDTE 

The local-clearing control of the IDTE instruction does not have any effect
for the clearing-by-ASCE operation. Only the invalidation-and-clearing
operation respects the local-clearing bit.

Remove __tlb_flush_idte_local and simplify the batched TLB flushing code.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-06-10 10:56:44 +02:00
parent b059152245
commit d5dcafee5f
1 changed files with 9 additions and 35 deletions
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30
arch/s390/include/asm/tlbflush.h
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@ -26,17 +26,6 @@ static inline void __tlb_flush_idte(unsigned long asce)
: : "a" (2048), "a" (asce) : "cc");
}
/*
* Flush TLB entries for a specific ASCE on the local CPU
*/
static inline void __tlb_flush_idte_local(unsigned long asce)
{
/* Local TLB flush for the mm */
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,1"
: : "a" (2048), "a" (asce) : "cc");
}
#ifdef CONFIG_SMP
void smp_ptlb_all(void);
@ -65,9 +54,7 @@ static inline void __tlb_flush_full(struct mm_struct *mm)
/* Global TLB flush */
__tlb_flush_global();
/* Reset TLB flush mask */
if (MACHINE_HAS_TLB_LC)
cpumask_copy(mm_cpumask(mm),
&mm->context.cpu_attach_mask);
cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
}
atomic_dec(&mm->context.flush_count);
preempt_enable();
@ -81,19 +68,12 @@ static inline void __tlb_flush_asce(struct mm_struct *mm, unsigned long asce)
{
preempt_disable();
atomic_inc(&mm->context.flush_count);
if (MACHINE_HAS_TLB_LC &&
cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
__tlb_flush_idte_local(asce);
} else {
if (MACHINE_HAS_IDTE)
__tlb_flush_idte(asce);
else
__tlb_flush_global();
/* Reset TLB flush mask */
if (MACHINE_HAS_TLB_LC)
cpumask_copy(mm_cpumask(mm),
&mm->context.cpu_attach_mask);
}
cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
atomic_dec(&mm->context.flush_count);
preempt_enable();
}
@ -114,17 +94,11 @@ static inline void __tlb_flush_kernel(void)
*/
static inline void __tlb_flush_asce(struct mm_struct *mm, unsigned long asce)
{
if (MACHINE_HAS_TLB_LC)
__tlb_flush_idte_local(asce);
else
__tlb_flush_local();
}
static inline void __tlb_flush_kernel(void)
{
if (MACHINE_HAS_TLB_LC)
__tlb_flush_idte_local(init_mm.context.asce);
else
__tlb_flush_local();
}
#endif