linux-kernel - [PATCH 09/19] riscv: uaccess: Add alternative for xtheadvector uaccess

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Message-Id: <20240411-dev-charlie-support_thead_vector_6_9-v1-9-4af9815ec746@rivosinc.com>
Date: Thu, 11 Apr 2024 21:11:15 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Guo Ren <guoren@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
 Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Conor Dooley <conor.dooley@...rochip.com>, Evan Green <evan@...osinc.com>, 
 Clément Léger <cleger@...osinc.com>, 
 Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>, 
 linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 09/19] riscv: uaccess: Add alternative for xtheadvector
 uaccess

At this time, use the fallback uaccess routines rather than customizing
the vectorized uaccess routines to be compatible with xtheadvector.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
 arch/riscv/lib/uaccess.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
index bc22c078aba8..74bd75b673d7 100644
--- a/arch/riscv/lib/uaccess.S
+++ b/arch/riscv/lib/uaccess.S
@@ -15,6 +15,7 @@
 SYM_FUNC_START(__asm_copy_to_user)
 #ifdef CONFIG_RISCV_ISA_V
 	ALTERNATIVE("j fallback_scalar_usercopy", "nop", 0, RISCV_ISA_EXT_v, CONFIG_RISCV_ISA_V)
+	ALTERNATIVE("nop", "j fallback_scalar_usercopy", 0, RISCV_ISA_VENDOR_EXT_XTHEADVECTOR, CONFIG_RISCV_ISA_V)
 	REG_L	t0, riscv_v_usercopy_threshold
 	bltu	a2, t0, fallback_scalar_usercopy
 	tail enter_vector_usercopy

-- 
2.44.0