[PATCH -next v13 06/19] riscv: Introduce Vector enable/disable helpers

[Andy Chiu]

These are small and likely to be frequently called so implement as
inline routines (vs. function call).

Co-developed-by: Guo Ren <guoren at linux.alibaba.com>
Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
Co-developed-by: Vincent Chen <vincent.chen at sifive.com>
Signed-off-by: Vincent Chen <vincent.chen at sifive.com>
Signed-off-by: Greentime Hu <greentime.hu at sifive.com>
Signed-off-by: Vineet Gupta <vineetg at rivosinc.com>
[vineetg: create new patch from meshup, introduced asm variant]
Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
[andy.chiu: remove calls from asm thus remove asm vaiant]
---
 arch/riscv/include/asm/vector.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vector.h
index 917c8867e702..0fda0faf5277 100644
--- a/arch/riscv/include/asm/vector.h
+++ b/arch/riscv/include/asm/vector.h
@@ -11,12 +11,23 @@
 #ifdef CONFIG_RISCV_ISA_V
 
 #include <asm/hwcap.h>
+#include <asm/csr.h>
 
 static __always_inline bool has_vector(void)
 {
 	return static_branch_likely(&riscv_isa_ext_keys[RISCV_ISA_EXT_KEY_VECTOR]);
 }
 
+static __always_inline void rvv_enable(void)
+{
+	csr_set(CSR_SSTATUS, SR_VS);
+}
+
+static __always_inline void rvv_disable(void)
+{
+	csr_clear(CSR_SSTATUS, SR_VS);
+}
+
 #else /* ! CONFIG_RISCV_ISA_V  */
 
 static __always_inline bool has_vector(void) { return false; }
-- 
2.17.1