Add support to the kernel for THead vendor extensions with the target of
the new extension xtheadvector.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
 arch/riscv/Kconfig.vendor                        | 13 +++++++++++++
 arch/riscv/include/asm/vendor_extensions/thead.h | 16 ++++++++++++++++
 arch/riscv/kernel/cpufeature.c                   |  1 +
 arch/riscv/kernel/vendor_extensions.c            | 10 ++++++++++
 arch/riscv/kernel/vendor_extensions/Makefile     |  1 +
 arch/riscv/kernel/vendor_extensions/thead.c      | 18 ++++++++++++++++++
 6 files changed, 59 insertions(+)

diff --git a/arch/riscv/Kconfig.vendor b/arch/riscv/Kconfig.vendor
index 6f1cdd32ed29..9897442bd44f 100644
--- a/arch/riscv/Kconfig.vendor
+++ b/arch/riscv/Kconfig.vendor
@@ -16,4 +16,17 @@ config RISCV_ISA_VENDOR_EXT_ANDES
 	  If you don't know what to do here, say Y.
 endmenu
 
+menu "T-Head"
+config RISCV_ISA_VENDOR_EXT_THEAD
+	bool "T-Head vendor extension support"
+	select RISCV_ISA_VENDOR_EXT
+	default y
+	help
+	  Say N here to disable detection of and support for all T-Head vendor
+	  extensions. Without this option enabled, T-Head vendor extensions will
+	  not be detected at boot and their presence not reported to userspace.
+
+	  If you don't know what to do here, say Y.
+endmenu
+
 endmenu
diff --git a/arch/riscv/include/asm/vendor_extensions/thead.h b/arch/riscv/include/asm/vendor_extensions/thead.h
new file mode 100644
index 000000000000..48421d1553ad
--- /dev/null
+++ b/arch/riscv/include/asm/vendor_extensions/thead.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
+#define _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
+
+#include <asm/vendor_extensions.h>
+
+#include <linux/types.h>
+
+/*
+ * Extension keys must be strictly less than RISCV_ISA_VENDOR_EXT_MAX.
+ */
+#define RISCV_ISA_VENDOR_EXT_XTHEADVECTOR		0
+
+extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead;
+
+#endif
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 8f20607adb40..46e69b9d66a7 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -25,6 +25,7 @@
 #include <asm/sbi.h>
 #include <asm/vector.h>
 #include <asm/vendor_extensions.h>
+#include <asm/vendor_extensions/thead.h>
 
 #define NUM_ALPHA_EXTS ('z' - 'a' + 1)
 
diff --git a/arch/riscv/kernel/vendor_extensions.c b/arch/riscv/kernel/vendor_extensions.c
index b6c1e7b5d34b..662ba64a8f93 100644
--- a/arch/riscv/kernel/vendor_extensions.c
+++ b/arch/riscv/kernel/vendor_extensions.c
@@ -6,6 +6,7 @@
 #include <asm/vendorid_list.h>
 #include <asm/vendor_extensions.h>
 #include <asm/vendor_extensions/andes.h>
+#include <asm/vendor_extensions/thead.h>
 
 #include <linux/array_size.h>
 #include <linux/types.h>
@@ -14,6 +15,9 @@ struct riscv_isa_vendor_ext_data_list *riscv_isa_vendor_ext_list[] = {
 #ifdef CONFIG_RISCV_ISA_VENDOR_EXT_ANDES
 	&riscv_isa_vendor_ext_list_andes,
 #endif
+#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD
+	&riscv_isa_vendor_ext_list_thead,
+#endif
 };
 
 const size_t riscv_isa_vendor_ext_list_size = ARRAY_SIZE(riscv_isa_vendor_ext_list);
@@ -41,6 +45,12 @@ bool __riscv_isa_vendor_extension_available(int cpu, unsigned long vendor, unsig
 		cpu_bmap = &riscv_isa_vendor_ext_list_andes.per_hart_isa_bitmap[cpu];
 		break;
 	#endif
+	#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD
+	case THEAD_VENDOR_ID:
+		bmap = &riscv_isa_vendor_ext_list_thead.all_harts_isa_bitmap;
+		cpu_bmap = &riscv_isa_vendor_ext_list_thead.per_hart_isa_bitmap[cpu];
+		break;
+	#endif
 	default:
 		return false;
 	}
diff --git a/arch/riscv/kernel/vendor_extensions/Makefile b/arch/riscv/kernel/vendor_extensions/Makefile
index 6a61aed944f1..353522cb3bf0 100644
--- a/arch/riscv/kernel/vendor_extensions/Makefile
+++ b/arch/riscv/kernel/vendor_extensions/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES)	+= andes.o
+obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD)	+= thead.o
diff --git a/arch/riscv/kernel/vendor_extensions/thead.c b/arch/riscv/kernel/vendor_extensions/thead.c
new file mode 100644
index 000000000000..0f27baf8d245
--- /dev/null
+++ b/arch/riscv/kernel/vendor_extensions/thead.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <asm/cpufeature.h>
+#include <asm/vendor_extensions.h>
+#include <asm/vendor_extensions/thead.h>
+
+#include <linux/array_size.h>
+#include <linux/types.h>
+
+/* All T-Head vendor extensions supported in Linux */
+static const struct riscv_isa_ext_data riscv_isa_vendor_ext_thead[] = {
+	__RISCV_ISA_EXT_DATA(xtheadvector, RISCV_ISA_VENDOR_EXT_XTHEADVECTOR),
+};
+
+struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead = {
+	.ext_data_count = ARRAY_SIZE(riscv_isa_vendor_ext_thead),
+	.ext_data = riscv_isa_vendor_ext_thead,
+};

-- 
2.45.0