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powerpc/64s/radix: Improve preempt handling in TLB code 

Preempt should be consistently disabled for mm_is_thread_local tests,
so bring the rest of these under preempt_disable().

Preempt does not need to be disabled for the mm->context.id tests,
which allows simplification and removal of gotos.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-10-24 23:06:53 +10:00 committed by Michael Ellerman
parent 63c9d8a4b3
commit dffe8449c5
1 changed files with 23 additions and 25 deletions
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48
arch/powerpc/mm/tlb-radix.c
View File

@ -186,16 +186,15 @@ void radix__flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
return;
preempt_disable();
if (!mm_is_thread_local(mm))
_tlbie_pid(pid, RIC_FLUSH_TLB);
else
_tlbiel_pid(pid, RIC_FLUSH_TLB);
no_context:
preempt_enable();
}
EXPORT_SYMBOL(radix__flush_tlb_mm);
@ -204,16 +203,15 @@ void radix__flush_all_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
return;
preempt_disable();
if (!mm_is_thread_local(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbiel_pid(pid, RIC_FLUSH_ALL);
no_context:
preempt_enable();
}
EXPORT_SYMBOL(radix__flush_all_mm);
@ -230,15 +228,15 @@ void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
unsigned long pid;
unsigned long ap = mmu_get_ap(psize);
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto bail;
return;
preempt_disable();
if (!mm_is_thread_local(mm))
_tlbie_va(vmaddr, pid, ap, RIC_FLUSH_TLB);
else
_tlbiel_va(vmaddr, pid, ap, RIC_FLUSH_TLB);
bail:
preempt_enable();
}
@ -322,46 +320,44 @@ void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
{
unsigned long pid;
unsigned long addr;
int local = mm_is_thread_local(mm);
bool local;
unsigned long ap = mmu_get_ap(psize);
unsigned long page_size = 1UL << mmu_psize_defs[psize].shift;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto err_out;
return;
preempt_disable();
local = mm_is_thread_local(mm);
if (end == TLB_FLUSH_ALL ||
(end - start) > tlb_single_page_flush_ceiling * page_size) {
if (local)
_tlbiel_pid(pid, RIC_FLUSH_TLB);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
goto err_out;
}
for (addr = start; addr < end; addr += page_size) {
} else {
for (addr = start; addr < end; addr += page_size) {
if (local)
_tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB);
else
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
if (local)
_tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB);
else
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
}
}
err_out:
preempt_enable();
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
{
int local = mm_is_thread_local(mm);
unsigned long ap = mmu_get_ap(mmu_virtual_psize);
unsigned long pid, end;
bool local;
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
return;
/* 4k page size, just blow the world */
if (PAGE_SIZE == 0x1000) {
@ -369,6 +365,8 @@ void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
return;
}
preempt_disable();
local = mm_is_thread_local(mm);
/* Otherwise first do the PWC */
if (local)
_tlbiel_pid(pid, RIC_FLUSH_PWC);
@ -383,7 +381,7 @@ void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
else
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
}
no_context:
preempt_enable();
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */