riscv: add ISA extension parsing for Zilsd and Zclsd

Add parsing for Zilsd and Zclsd ISA extensions which were ratified in
commit f88abf1 ("Integrating load/store pair for RV32 with the
main manual") of the riscv-isa-manual.

Signed-off-by: Pincheng Wang <pincheng.plct@isrc.iscas.ac.cn>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://patch.msgid.link/20250826162939.1494021-3-pincheng.plct@isrc.iscas.ac.cn
[pjw@kernel.org: cleaned up checkpatch issues, whitespace; updated to apply]
Signed-off-by: Paul Walmsley <pjw@kernel.org>

Author: wpcwzy

arch/riscv/include/asm/hwcap.h

@@ -108,6 +108,8 @@
 #define RISCV_ISA_EXT_ZICBOP		99
 #define RISCV_ISA_EXT_SVRSW60T59B	100
 #define RISCV_ISA_EXT_ZALASR		101
+#define RISCV_ISA_EXT_ZILSD		102
+#define RISCV_ISA_EXT_ZCLSD		103
 
 #define RISCV_ISA_EXT_XLINUXENVCFG	127
 

arch/riscv/kernel/cpufeature.c

@@ -242,6 +242,28 @@ static int riscv_ext_zcf_validate(const struct riscv_isa_ext_data *data,
 	return -EPROBE_DEFER;
 }
 
+static int riscv_ext_zilsd_validate(const struct riscv_isa_ext_data *data,
+				    const unsigned long *isa_bitmap)
+{
+	if (IS_ENABLED(CONFIG_64BIT))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int riscv_ext_zclsd_validate(const struct riscv_isa_ext_data *data,
+				    const unsigned long *isa_bitmap)
+{
+	if (IS_ENABLED(CONFIG_64BIT))
+		return -EINVAL;
+
+	if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZILSD) &&
+	    __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA))
+		return 0;
+
+	return -EPROBE_DEFER;
+}
+
 static int riscv_vector_f_validate(const struct riscv_isa_ext_data *data,
 				   const unsigned long *isa_bitmap)
 {
@@ -484,6 +506,8 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcd, RISCV_ISA_EXT_ZCD, riscv_ext_zcd_validate),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcf, RISCV_ISA_EXT_ZCF, riscv_ext_zcf_validate),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcmop, RISCV_ISA_EXT_ZCMOP, riscv_ext_zca_depends),
+	__RISCV_ISA_EXT_DATA_VALIDATE(zclsd, RISCV_ISA_EXT_ZCLSD, riscv_ext_zclsd_validate),
+	__RISCV_ISA_EXT_DATA_VALIDATE(zilsd, RISCV_ISA_EXT_ZILSD, riscv_ext_zilsd_validate),
 	__RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
 	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
 	__RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC),