linux-kernel - [PATCH v2 02/21] RISC-V: Add Sxcsrind ISA extension CSR definitions

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Message-Id: <20250114-counter_delegation-v2-2-8ba74cdb851b@rivosinc.com>
Date: Tue, 14 Jan 2025 14:57:27 -0800
From: Atish Patra <atishp@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Anup Patel <anup@...infault.org>, 
 Atish Patra <atishp@...shpatra.org>, Will Deacon <will@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>, 
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, weilin.wang@...el.com
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Palmer Dabbelt <palmer@...ive.com>, Conor Dooley <conor@...nel.org>, 
 devicetree@...r.kernel.org, kvm@...r.kernel.org, 
 kvm-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-perf-users@...r.kernel.org, Atish Patra <atishp@...osinc.com>, 
 Kaiwen Xue <kaiwenx@...osinc.com>
Subject: [PATCH v2 02/21] RISC-V: Add Sxcsrind ISA extension CSR
 definitions

From: Kaiwen Xue <kaiwenx@...osinc.com>

This adds definitions of new CSRs and bits defined in Sxcsrind ISA
extension. These CSR enables indirect accesses mechanism to access
any CSRs in M-, S-, and VS-mode. The range of the select values
and ireg will be define by the ISA extension using Sxcsrind extension.

Signed-off-by: Kaiwen Xue <kaiwenx@...osinc.com>
Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/include/asm/csr.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 37bdea65bbd8..2ad2d492e6b4 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -318,6 +318,12 @@
 /* Supervisor-Level Window to Indirectly Accessed Registers (AIA) */
 #define CSR_SISELECT		0x150
 #define CSR_SIREG		0x151
+/* Supervisor-Level Window to Indirectly Accessed Registers (Sxcsrind) */
+#define CSR_SIREG2		0x152
+#define CSR_SIREG3		0x153
+#define CSR_SIREG4		0x155
+#define CSR_SIREG5		0x156
+#define CSR_SIREG6		0x157
 
 /* Supervisor-Level Interrupts (AIA) */
 #define CSR_STOPEI		0x15c
@@ -365,6 +371,14 @@
 /* VS-Level Window to Indirectly Accessed Registers (H-extension with AIA) */
 #define CSR_VSISELECT		0x250
 #define CSR_VSIREG		0x251
+/*
+ * VS-Level Window to Indirectly Accessed Registers (H-extension with Sxcsrind)
+ */
+#define CSR_VSIREG2		0x252
+#define CSR_VSIREG3		0x253
+#define CSR_VSIREG4		0x255
+#define CSR_VSIREG5		0x256
+#define CSR_VISREG6		0x257
 
 /* VS-Level Interrupts (H-extension with AIA) */
 #define CSR_VSTOPEI		0x25c
@@ -407,6 +421,12 @@
 /* Machine-Level Window to Indirectly Accessed Registers (AIA) */
 #define CSR_MISELECT		0x350
 #define CSR_MIREG		0x351
+/* Machine-Level Window to Indrecitly Accessed Registers (Sxcsrind) */
+#define CSR_MIREG2		0x352
+#define CSR_MIREG3		0x353
+#define CSR_MIREG4		0x355
+#define CSR_MIREG5		0x356
+#define CSR_MIREG6		0x357
 
 /* Machine-Level Interrupts (AIA) */
 #define CSR_MTOPEI		0x35c
@@ -452,6 +472,11 @@
 # define CSR_IEH		CSR_MIEH
 # define CSR_ISELECT	CSR_MISELECT
 # define CSR_IREG	CSR_MIREG
+# define CSR_IREG2	CSR_MIREG2
+# define CSR_IREG3	CSR_MIREG3
+# define CSR_IREG4	CSR_MIREG4
+# define CSR_IREG5	CSR_MIREG5
+# define CSR_IREG6	CSR_MIREG6
 # define CSR_IPH		CSR_MIPH
 # define CSR_TOPEI	CSR_MTOPEI
 # define CSR_TOPI	CSR_MTOPI
@@ -477,6 +502,11 @@
 # define CSR_IEH		CSR_SIEH
 # define CSR_ISELECT	CSR_SISELECT
 # define CSR_IREG	CSR_SIREG
+# define CSR_IREG2	CSR_SIREG2
+# define CSR_IREG3	CSR_SIREG3
+# define CSR_IREG4	CSR_SIREG4
+# define CSR_IREG5	CSR_SIREG5
+# define CSR_IREG6	CSR_SIREG6
 # define CSR_IPH		CSR_SIPH
 # define CSR_TOPEI	CSR_STOPEI
 # define CSR_TOPI	CSR_STOPI

-- 
2.34.1