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| author | Noam Camus <noamca@mellanox.com> | 2017-05-28 08:52:03 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2017-08-29 00:17:36 +0200 |
| commit | 30b7af252e8fef6bf2fc311ca654c40bd0552220 (patch) | |
| tree | 792121b86f7a4350bfd7f227206fc36578517216 /arch/arc/mm | |
| parent | ARC: [plat-eznps] typo fix at Kconfig (diff) | |
| download | linux-30b7af252e8fef6bf2fc311ca654c40bd0552220.tar.xz linux-30b7af252e8fef6bf2fc311ca654c40bd0552220.zip | |
ARC: [plat-eznps] Fix TLB Errata
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>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm')
| -rw-r--r-- | arch/arc/mm/tlbex.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index b30e4e36bb00..0e1e47a67c73 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 +294,8 @@ ex_saved_reg1: #else sr TLBInsertEntry, [ARC_REG_TLBCOMMAND] #endif + +88: .endm |