linux-kernel - [PATCH v2 02/27] riscv: define default value for envcfg

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Message-Id: <20240329044459.3990638-3-debug@rivosinc.com>
Date: Thu, 28 Mar 2024 21:44:34 -0700
From: Deepak Gupta <debug@...osinc.com>
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Subject: [PATCH v2 02/27] riscv: define default value for envcfg

Defines a base default value for envcfg per task. By default all tasks
should have cache zeroing capability. Any future base capabilities that
apply to all tasks can be turned on same way.

Signed-off-by: Deepak Gupta <debug@...osinc.com>
---
 arch/riscv/include/asm/csr.h | 2 ++
 arch/riscv/kernel/process.c  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 2468c55933cd..bbd2207adb39 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -202,6 +202,8 @@
 #define ENVCFG_CBIE_FLUSH		_AC(0x1, UL)
 #define ENVCFG_CBIE_INV			_AC(0x3, UL)
 #define ENVCFG_FIOM			_AC(0x1, UL)
+/* by default all threads should be able to zero cache */
+#define ENVCFG_BASE			ENVCFG_CBZE
 
 /* Smstateen bits */
 #define SMSTATEEN0_AIA_IMSIC_SHIFT	58
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 92922dbd5b5c..9a85c9d4c902 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -152,6 +152,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
 	else
 		regs->status |= SR_UXL_64;
 #endif
+	current->thread_info.envcfg = ENVCFG_BASE;
 }
 
 void flush_thread(void)
-- 
2.43.2