Re: [PATCH] powerpc/32s: Slenderize _tlbia() for powerpc 603/603e
From: Joakim Tjernlund <hidden>
Date: 2020-02-03 16:57:26
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On Mon, 2020-02-03 at 16:47 +0000, Christophe Leroy wrote:
quoted hunk ↗ jump to hunk
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. _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 <redacted> --- 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
Is page size always 4096 here or does it not matter ?
+ 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