Commit e1347a02 authored Feb 03, 2020 by Christophe Leroy Committed by Michael Ellerman Feb 19, 2020

powerpc/32s: Slenderize _tlbia() for powerpc 603/603e



_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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/12f4f4f0ff89aeab3b937fc96c84fb35e1b2517e.1580748445.git.christophe.leroy@c-s.fr

parent a83836db

arch/powerpc/mm/book3s32/hash_low.S

+8 −5

Original line number	Diff line number	Diff line
		@@ -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

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