From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941208AbdEYCfy (ORCPT ); Wed, 24 May 2017 22:35:54 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:43601 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932661AbdEYCeo (ORCPT ); Wed, 24 May 2017 22:34:44 -0400 From: Noam Camus To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Noam Camus Subject: [PATCH 06/10] ARC: [plat-eznps] Fix TLB Errata Date: Thu, 25 May 2017 05:34:16 +0300 Message-Id: <1495679660-9598-7-git-send-email-noamca@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1495679660-9598-1-git-send-email-noamca@mellanox.com> References: <1495679660-9598-1-git-send-email-noamca@mellanox.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Noam Camus Due to a HW bug in NPS400 we get from time to time false TLB miss. Workaround this by validating each miss. Signed-off-by: Noam Camus --- arch/arc/mm/tlbex.S | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index b30e4e3..1d48723 100644 --- a/arch/arc/mm/tlbex.S +++ b/arch/arc/mm/tlbex.S @@ -274,6 +274,13 @@ ex_saved_reg1: .macro COMMIT_ENTRY_TO_MMU #if (CONFIG_ARC_MMU_VER < 4) +#ifdef CONFIG_EZNPS_MTM_EXT + /* verify if entry for this vaddr+ASID already exists */ + sr TLBProbe, [ARC_REG_TLBCOMMAND] + lr r0, [ARC_REG_TLBINDEX] + bbit0 r0, 31, 88f +#endif + /* Get free TLB slot: Set = computed from vaddr, way = random */ sr TLBGetIndex, [ARC_REG_TLBCOMMAND] @@ -287,6 +294,9 @@ ex_saved_reg1: #else sr TLBInsertEntry, [ARC_REG_TLBCOMMAND] #endif +#ifdef CONFIG_EZNPS_MTM_EXT +88: +#endif .endm -- 1.7.1