From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wtpQx0cxPzDr0r for ; Fri, 23 Jun 2017 03:26:33 +1000 (AEST) From: Michael Neuling To: mpe@ellerman.id.au Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin , benh@kernel.crashing.org, Michael Neuling Subject: [PATCH] powerpc: Invalidate ERAT on powersave wakeup for POWER9 Date: Thu, 22 Jun 2017 12:26:16 -0500 Message-Id: <20170622172616.7598-1-mikey@neuling.org> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On POWER9 the ERAT may be incorrect on wakeup from some stop states that lose state. This causes random segvs and illegal instructions when these stop states are enabled. This patch invalidates the ERAT on wakeup on POWER9 to prevent this from causing a problem. Signed-off-by: Michael Neuling --- arch/powerpc/kernel/idle_book3s.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index 1ea14b96f1..ace2ad50c8 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -793,6 +793,9 @@ fastsleep_workaround_at_exit: */ .global pnv_wakeup_loss pnv_wakeup_loss: +BEGIN_FTR_SECTION + PPC_INVALIDATE_ERAT +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) ld r1,PACAR1(r13) BEGIN_FTR_SECTION CHECK_HMI_INTERRUPT -- 2.11.0