[PATCH v9 08/20] RISC-V: Add Ssccfg extension CSR definition

[Atish Patra]

From: Kaiwen Xue <kaiwenx@xxxxxxxxxxxx>

This adds the scountinhibit CSR definition and S-mode accessible hpmevent
bits defined by smcdeleg/ssccfg. scountinhibit allows S-mode to start/stop
counters directly from S-mode without invoking SBI calls to M-mode. It is
also used to figure out the counters delegated to S-mode by the M-mode as
well.

Signed-off-by: Kaiwen Xue <kaiwenx@xxxxxxxxxxxx>
Reviewed-by: Clément Léger <cleger@xxxxxxxxxxxx>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@xxxxxxxxx>
Tested-by: Charlie Jenkins <thecharlesjenkins@xxxxxxxxx>
Link: https://patch.msgid.link/20260701-counter_delegation-v8-8-7909f863a645@xxxxxxxx
[pjw@xxxxxxxxxx: fixed subject typo]
Signed-off-by: Paul Walmsley <pjw@xxxxxxxxxx>
---
 arch/riscv/include/asm/csr.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 7f09e54a0f9a..c8b94f3337c1 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -241,6 +241,23 @@
 #define SMSTATEEN0_HSENVCFG		(_ULL(1) << SMSTATEEN0_HSENVCFG_SHIFT)
 #define SMSTATEEN0_SSTATEEN0_SHIFT	63
 #define SMSTATEEN0_SSTATEEN0		(_ULL(1) << SMSTATEEN0_SSTATEEN0_SHIFT)
+/* HPMEVENT bits. These are accessible in S-mode via Smcdeleg/Ssccfg */
+#define HPMEVENT_OF			(BIT_ULL(63))
+#define HPMEVENT_MINH			(BIT_ULL(62))
+#define HPMEVENT_SINH			(BIT_ULL(61))
+#define HPMEVENT_UINH			(BIT_ULL(60))
+#define HPMEVENT_VSINH			(BIT_ULL(59))
+#define HPMEVENT_VUINH			(BIT_ULL(58))
+#ifndef CONFIG_64BIT
+#define HPMEVENTH_OF			(BIT(31))
+#define HPMEVENTH_MINH			(BIT(30))
+#define HPMEVENTH_SINH			(BIT(29))
+#define HPMEVENTH_UINH			(BIT(28))
+#define HPMEVENTH_VSINH			(BIT(27))
+#define HPMEVENTH_VUINH			(BIT(26))
+#endif
+
+#define SISELECT_SSCCFG_BASE		0x40
 
 /* mseccfg bits */
 #define MSECCFG_PMM			ENVCFG_PMM
@@ -322,6 +339,7 @@
 #define CSR_SCOUNTEREN		0x106
 #define CSR_SENVCFG		0x10a
 #define CSR_SSTATEEN0		0x10c
+#define CSR_SCOUNTINHIBIT	0x120
 #define CSR_SSCRATCH		0x140
 #define CSR_SEPC		0x141
 #define CSR_SCAUSE		0x142

-- 
2.53.0-Meta