riscv: hwprobe: export bfloat16 ISA extension

Export Zfbmin, Zvfbfmin, Zvfbfwma ISA extension through hwprobe.

Signed-off-by: Inochi Amaoto <[email protected]>
Reviewed-by: Clément Léger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Ghiti <[email protected]>

Author: inochisa

Documentation/arch/riscv/hwprobe.rst

@@ -242,6 +242,18 @@ The following keys are defined:
   * :c:macro:`RISCV_HWPROBE_EXT_SUPM`: The Supm extension is supported as
        defined in version 1.0 of the RISC-V Pointer Masking extensions.
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZFBFMIN`: The Zfbfmin extension is supported as
+       defined in the RISC-V ISA manual starting from commit 4dc23d6229de
+       ("Added Chapter title to BF16").
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVFBFMIN`: The Zvfbfmin extension is supported as
+       defined in the RISC-V ISA manual starting from commit 4dc23d6229de
+       ("Added Chapter title to BF16").
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZVFBFWMA`: The Zvfbfwma extension is supported as
+       defined in the RISC-V ISA manual starting from commit 4dc23d6229de
+       ("Added Chapter title to BF16").
+
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: Deprecated.  Returns similar values to
      :c:macro:`RISCV_HWPROBE_KEY_MISALIGNED_SCALAR_PERF`, but the key was
      mistakenly classified as a bitmask rather than a value.

arch/riscv/include/uapi/asm/hwprobe.h

@@ -73,6 +73,9 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZCMOP		(1ULL << 47)
 #define		RISCV_HWPROBE_EXT_ZAWRS		(1ULL << 48)
 #define		RISCV_HWPROBE_EXT_SUPM		(1ULL << 49)
+#define		RISCV_HWPROBE_EXT_ZFBFMIN	(1ULL << 50)
+#define		RISCV_HWPROBE_EXT_ZVFBFMIN	(1ULL << 51)
+#define		RISCV_HWPROBE_EXT_ZVFBFWMA	(1ULL << 52)
 #define RISCV_HWPROBE_KEY_CPUPERF_0	5
 #define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)
 #define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)

arch/riscv/kernel/sys_hwprobe.c

@@ -131,6 +131,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 			EXT_KEY(ZVE64D);
 			EXT_KEY(ZVE64F);
 			EXT_KEY(ZVE64X);
+			EXT_KEY(ZVFBFMIN);
+			EXT_KEY(ZVFBFWMA);
 			EXT_KEY(ZVFH);
 			EXT_KEY(ZVFHMIN);
 			EXT_KEY(ZVKB);
@@ -147,6 +149,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 			EXT_KEY(ZCD);
 			EXT_KEY(ZCF);
 			EXT_KEY(ZFA);
+			EXT_KEY(ZFBFMIN);
 			EXT_KEY(ZFH);
 			EXT_KEY(ZFHMIN);
 		}