From: Noam Camus <noamca@mellanox.com>
To: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Noam Camus <noamca@mellanox.com>
Subject: [PATCH 06/10] ARC: [plat-eznps] Fix TLB Errata
Date: Thu, 25 May 2017 05:34:16 +0300 [thread overview]
Message-ID: <1495679660-9598-7-git-send-email-noamca@mellanox.com> (raw)
In-Reply-To: <1495679660-9598-1-git-send-email-noamca@mellanox.com>
From: Noam Camus <noamca@mellanox.com>
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 <noamca@mellanox.com>
---
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
next prev parent reply other threads:[~2017-05-25 2:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-25 2:34 [PATCH 00/10] ARC plat-eznps upstream cont Noam Camus
2017-05-25 2:34 ` [PATCH 01/10] ARC: set level of log per CPU during boot to be debug level Noam Camus
2017-05-25 10:55 ` Alexey Brodkin
2017-05-25 2:34 ` [PATCH 02/10] ARC: send ipi to all cpus sharing task mm in case of page fault Noam Camus
2017-05-25 11:36 ` Alexey Brodkin
2017-05-25 2:34 ` [PATCH 03/10] ARC: typo fix in mm/fault.c Noam Camus
2017-05-25 11:04 ` Alexey Brodkin
2017-05-25 2:34 ` [PATCH 04/10] ARC: typos fix in kernel/entry-compact.S Noam Camus
2017-05-25 11:05 ` Alexey Brodkin
2017-05-25 2:34 ` [PATCH 05/10] ARC: [plat-eznps] typo fix at Kconfig Noam Camus
2017-05-25 11:07 ` Alexey Brodkin
2017-05-25 2:34 ` Noam Camus [this message]
2017-05-25 11:00 ` [PATCH 06/10] ARC: [plat-eznps] Fix TLB Errata Alexey Brodkin
2017-05-25 11:12 ` Noam Camus
2017-06-01 21:16 ` Vineet Gupta
2017-05-25 2:34 ` [PATCH 07/10] ARC: [plat-eznps] disabled stall counter due to a HW bug Noam Camus
2017-05-25 11:10 ` Alexey Brodkin
2017-05-25 11:16 ` Noam Camus
2017-05-25 2:34 ` [PATCH 08/10] ARC: [plat-eznps] spinlock aware for MTM Noam Camus
2017-05-25 2:34 ` [PATCH 09/10] ARC: [plat-eznps] use schd.wft instruction instead of sleep at idle task Noam Camus
2017-05-25 2:34 ` [PATCH 10/10] ARC: [plat-eznps] Handle memory error as an exception Noam Camus
2017-05-25 11:14 ` Alexey Brodkin
2017-05-25 11:26 ` Noam Camus
2017-05-25 11:30 ` Alexey Brodkin
2017-05-25 12:03 ` Noam Camus
2017-05-25 12:05 ` Alexey Brodkin
2017-06-06 21:57 ` Vineet Gupta
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