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Message-Id: <20230206201455.1790329-5-evan@rivosinc.com>
Date: Mon, 6 Feb 2023 12:14:53 -0800
From: Evan Green <evan@...osinc.com>
To: Palmer Dabbelt <palmer@...osinc.com>
Cc: Conor Dooley <conor@...nel.org>, vineetg@...osinc.com,
heiko@...ech.de, slewis@...osinc.com,
Evan Green <evan@...osinc.com>,
Albert Ou <aou@...s.berkeley.edu>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH v2 4/6] dt-bindings: Add RISC-V misaligned access performance
From: Palmer Dabbelt <palmer@...osinc.com>
This key allows device trees to specify the performance of misaligned
accesses to main memory regions from each CPU in the system.
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Evan Green <evan@...osinc.com>
---
(no changes since v1)
Documentation/devicetree/bindings/riscv/cpus.yaml | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
index c6720764e765..2c09bd6f2927 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -85,6 +85,21 @@ properties:
$ref: "/schemas/types.yaml#/definitions/string"
pattern: ^rv(?:64|32)imaf?d?q?c?b?v?k?h?(?:_[hsxz](?:[a-z])+)*$
+ riscv,misaligned-access-performance:
+ description:
+ Identifies the performance of misaligned memory accesses to main memory
+ regions. There are three flavors of unaligned access performance: "emulated"
+ means that misaligned accesses are emulated via software and thus
+ extremely slow, "slow" means that misaligned accesses are supported by
+ hardware but still slower that aligned accesses sequences, and "fast"
+ means that misaligned accesses are as fast or faster than the
+ cooresponding aligned accesses sequences.
+ $ref: "/schemas/types.yaml#/definitions/string"
+ enum:
+ - emulated
+ - slow
+ - fast
+
# RISC-V requires 'timebase-frequency' in /cpus, so disallow it here
timebase-frequency: false
--
2.25.1
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