From: Vineet.Gupta1@synopsys.com (Vineet Gupta)
To: linux-snps-arc@lists.infradead.org
Subject: [PATCH 4/6] ARC: mm: tlb flush optim: Make TLBWriteNI fallback to TLBWrite if not available
Date: Mon, 16 Sep 2019 14:32:05 -0700 [thread overview]
Message-ID: <20190916213207.12792-5-vgupta@synopsys.com> (raw)
In-Reply-To: <20190916213207.12792-1-vgupta@synopsys.com>
TLBWriteNI was introduced in MMUv2 (to not invalidate uTLBs in Fast Path
TLB Refill Handler). To avoid #ifdef'ery make it fallback to TLBWrite availabel on all MMUs. This will also help with next change
Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
---
arch/arc/include/asm/mmu.h | 2 ++
arch/arc/mm/tlbex.S | 4 ----
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arc/include/asm/mmu.h b/arch/arc/include/asm/mmu.h
index 0abacb82a72b..26b731d32a2b 100644
--- a/arch/arc/include/asm/mmu.h
+++ b/arch/arc/include/asm/mmu.h
@@ -67,6 +67,8 @@
#if (CONFIG_ARC_MMU_VER >= 2)
#define TLBWriteNI 0x5 /* write JTLB without inv uTLBs */
#define TLBIVUTLB 0x6 /* explicitly inv uTLBs */
+#else
+#define TLBWriteNI TLBWrite /* Not present in hardware, fallback */
#endif
#if (CONFIG_ARC_MMU_VER >= 4)
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 4c88148d4cd1..2efaf6ca0c06 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -292,11 +292,7 @@ ex_saved_reg1:
sr TLBGetIndex, [ARC_REG_TLBCOMMAND]
/* Commit the Write */
-#if (CONFIG_ARC_MMU_VER >= 2) /* introduced in v2 */
sr TLBWriteNI, [ARC_REG_TLBCOMMAND]
-#else
- sr TLBWrite, [ARC_REG_TLBCOMMAND]
-#endif
#else
sr TLBInsertEntry, [ARC_REG_TLBCOMMAND]
--
2.20.1
next prev parent reply other threads:[~2019-09-16 21:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 21:32 [PATCH 0/6] ARC MMU code updates Vineet Gupta
2019-09-16 21:32 ` [PATCH 1/6] ARCv2: mm: TLB Miss optim: SMP builds can cache pgd pointer in mmu scratch reg Vineet Gupta
2019-09-16 21:32 ` [PATCH 2/6] ARCv2: mm: TLB Miss optim: Use double world load/stores LDD/STD Vineet Gupta
2019-09-16 21:32 ` [PATCH 3/6] ARC: mm: TLB Miss optim: avoid re-reading ECR Vineet Gupta
2019-09-16 23:36 ` Alexey Brodkin
2019-09-17 21:08 ` Vineet Gupta
2019-09-16 21:32 ` Vineet Gupta [this message]
2019-09-16 21:32 ` [PATCH 5/6] ARC: mm: tlb flush optim: elide repeated uTLB invalidate in loop Vineet Gupta
2019-09-16 21:32 ` [PATCH 6/6] ARC: mm: tlb flush optim: elide redundant uTLB invalidates for MMUv3 Vineet Gupta
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