[PATCH v4 3/4] RISC-V: hwprobe: Expose Zbc and the scalar crypto extensions

[Samuel Ortiz]

Zbc was missing from a previous Bit-Manipulation extension hwprobe
patch.

Add all scalar crypto extensions bits, and define a macro for setting
the hwprobe key/pair in a more readable way.

Reviewed-by: Evan Green <evan at rivosinc.com>
Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
Signed-off-by: Samuel Ortiz <sameo at rivosinc.com>
---
 Documentation/riscv/hwprobe.rst       | 35 ++++++++++++++++++++++++++
 arch/riscv/include/uapi/asm/hwprobe.h | 11 ++++++++
 arch/riscv/kernel/sys_riscv.c         | 36 ++++++++++++++++-----------
 3 files changed, 68 insertions(+), 14 deletions(-)

diff --git a/Documentation/riscv/hwprobe.rst b/Documentation/riscv/hwprobe.rst
index 19165ebd82ba..105b59e2e780 100644
--- a/Documentation/riscv/hwprobe.rst
+++ b/Documentation/riscv/hwprobe.rst
@@ -72,11 +72,46 @@ The following keys are defined:
        extensions.
 
   * :c:macro:`RISCV_HWPROBE_EXT_ZBB`: The Zbb extension is supported, as defined
+      in version 1.0 of the Bit-Manipulation ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZBC`: The Zbc extension is supported, as defined
        in version 1.0 of the Bit-Manipulation ISA extensions.
 
   * :c:macro:`RISCV_HWPROBE_EXT_ZBS`: The Zbs extension is supported, as defined
        in version 1.0 of the Bit-Manipulation ISA extensions.
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZBKB`: The Zbkb extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZBKC`: The Zbkc extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZBKX`: The Zbkx extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKND`: The Zknd extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKNE`: The Zkne extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKNH`: The Zknh extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKR`: The Zkr extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions. Depending on the
+    M-mode `mseccfg` CSR configuration, userspace may not be allowed to directly
+    access the Zkr-defined `seed` CSR.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKSED`: The Zksed extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKSH`: The Zksh extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZKT`: The Zkt extension is supported, as defined
+    in version 1.0 of the Scalar Cryptography ISA extensions.
+
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
   information about the selected set of processors.
 
diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
index 006bfb48343d..8357052061b3 100644
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
@@ -29,6 +29,17 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZBA		(1 << 3)
 #define		RISCV_HWPROBE_EXT_ZBB		(1 << 4)
 #define		RISCV_HWPROBE_EXT_ZBS		(1 << 5)
+#define		RISCV_HWPROBE_EXT_ZBC		(1 << 6)
+#define		RISCV_HWPROBE_EXT_ZBKB		(1 << 7)
+#define		RISCV_HWPROBE_EXT_ZBKC		(1 << 8)
+#define		RISCV_HWPROBE_EXT_ZBKX		(1 << 9)
+#define		RISCV_HWPROBE_EXT_ZKND		(1 << 10)
+#define		RISCV_HWPROBE_EXT_ZKNE		(1 << 11)
+#define		RISCV_HWPROBE_EXT_ZKNH		(1 << 12)
+#define		RISCV_HWPROBE_EXT_ZKR		(1 << 13)
+#define		RISCV_HWPROBE_EXT_ZKSED		(1 << 14)
+#define		RISCV_HWPROBE_EXT_ZKSH		(1 << 15)
+#define		RISCV_HWPROBE_EXT_ZKT		(1 << 16)
 #define RISCV_HWPROBE_KEY_CPUPERF_0	5
 #define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)
 #define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)
diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c
index 26ef5526bfb4..df15926196b6 100644
--- a/arch/riscv/kernel/sys_riscv.c
+++ b/arch/riscv/kernel/sys_riscv.c
@@ -145,20 +145,28 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 	for_each_cpu(cpu, cpus) {
 		struct riscv_isainfo *isainfo = &hart_isa[cpu];
 
-		if (riscv_isa_extension_available(isainfo->isa, ZBA))
-			pair->value |= RISCV_HWPROBE_EXT_ZBA;
-		else
-			missing |= RISCV_HWPROBE_EXT_ZBA;
-
-		if (riscv_isa_extension_available(isainfo->isa, ZBB))
-			pair->value |= RISCV_HWPROBE_EXT_ZBB;
-		else
-			missing |= RISCV_HWPROBE_EXT_ZBB;
-
-		if (riscv_isa_extension_available(isainfo->isa, ZBS))
-			pair->value |= RISCV_HWPROBE_EXT_ZBS;
-		else
-			missing |= RISCV_HWPROBE_EXT_ZBS;
+#define SET_HWPROBE_EXT_PAIR(ext)					\
+		do {							\
+			if (riscv_isa_extension_available(isainfo->isa, ext)) \
+				pair->value |= RISCV_HWPROBE_EXT_## ext; \
+			else						\
+				missing |= RISCV_HWPROBE_EXT_## ext;	\
+		} while (false)						\
+
+		SET_HWPROBE_EXT_PAIR(ZBA);
+		SET_HWPROBE_EXT_PAIR(ZBB);
+		SET_HWPROBE_EXT_PAIR(ZBC);
+		SET_HWPROBE_EXT_PAIR(ZBS);
+		SET_HWPROBE_EXT_PAIR(ZBKB);
+		SET_HWPROBE_EXT_PAIR(ZBKC);
+		SET_HWPROBE_EXT_PAIR(ZBKX);
+		SET_HWPROBE_EXT_PAIR(ZKND);
+		SET_HWPROBE_EXT_PAIR(ZKNE);
+		SET_HWPROBE_EXT_PAIR(ZKNH);
+		SET_HWPROBE_EXT_PAIR(ZKR);
+		SET_HWPROBE_EXT_PAIR(ZKSED);
+		SET_HWPROBE_EXT_PAIR(ZKSH);
+		SET_HWPROBE_EXT_PAIR(ZKT);
 	}
 
 	/* Now turn off reporting features if any CPU is missing it. */
-- 
2.41.0