Messages in this thread Patch in this message | | | From | Christophe Leroy <> | Subject | [PATCH] powerpc/32s: Slenderize _tlbia() for powerpc 603/603e | Date | Mon, 3 Feb 2020 16:47:37 +0000 (UTC) |
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_tlbia() is a function used only on 603/603e core, ie on CPUs which don't have a hash table.
_tlbia() uses the tlbia macro which implements a loop of 1024 tlbie.
On the 603/603e core, flushing the entire TLB requires no more than 32 tlbie.
Replace tlbia by a loop of 32 tlbie.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/mm/book3s32/hash_low.S | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S index c11b0a005196..a5039ad10429 100644 --- a/arch/powerpc/mm/book3s32/hash_low.S +++ b/arch/powerpc/mm/book3s32/hash_low.S @@ -696,18 +696,21 @@ _GLOBAL(_tlbia) bne- 10b stwcx. r8,0,r9 bne- 10b +#endif /* CONFIG_SMP */ + li r5, 32 + lis r4, KERNELBASE@h + mtctr r5 sync - tlbia +0: tlbie r4 + addi r4, r4, 0x1000 + bdnz 0b sync +#ifdef CONFIG_SMP TLBSYNC li r0,0 stw r0,0(r9) /* clear mmu_hash_lock */ mtmsr r10 SYNC_601 isync -#else /* CONFIG_SMP */ - sync - tlbia - sync #endif /* CONFIG_SMP */ blr -- 2.25.0
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