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riscv: hwprobe: Add SiFive vendor extension support and probe for xsfqmaccdod and xsfqmaccqoq

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Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_SIFIVE_0" which allows
userspace to probe for the new vendor extensions from SiFive. Also, add
new hwprobe for SiFive "xsfvqmaccdod" and "xsfvqmaccqoq" vendor
extensions.

Signed-off-by: Cyan Yang <cyan.yang@sifive.com>
Link: https://lore.kernel.org/r/20250418053239.4351-5-cyan.yang@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Cyan Yang 2025-04-18 13:32:31 +08:00 committed by Palmer Dabbelt
parent e8fd215ed0
commit 1a6274f035
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
6 changed files with 50 additions and 0 deletions
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1
arch/riscv/include/asm/hwprobe.h
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@ -22,6 +22,7 @@ static inline bool hwprobe_key_is_bitmask(__s64 key)
case RISCV_HWPROBE_KEY_IMA_EXT_0:
case RISCV_HWPROBE_KEY_CPUPERF_0:
case RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0:
case RISCV_HWPROBE_KEY_VENDOR_EXT_SIFIVE_0:
return true;
}

19
arch/riscv/include/asm/vendor_extensions/sifive_hwprobe.h Normal file
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@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_SIFIVE_HWPROBE_H
#define _ASM_RISCV_VENDOR_EXTENSIONS_SIFIVE_HWPROBE_H
#include <linux/cpumask.h>
#include <uapi/asm/hwprobe.h>
#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_SIFIVE
void hwprobe_isa_vendor_ext_sifive_0(struct riscv_hwprobe *pair, const struct cpumask *cpus);
#else
static inline void hwprobe_isa_vendor_ext_sifive_0(struct riscv_hwprobe *pair,
const struct cpumask *cpus)
{
pair->value = 0;
}
#endif
#endif

4
arch/riscv/include/uapi/asm/vendor/sifive.h vendored Normal file
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@ -0,0 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#define RISCV_HWPROBE_VENDOR_EXT_XSFVQMACCDOD (1 << 0)
#define RISCV_HWPROBE_VENDOR_EXT_XSFVQMACCQOQ (1 << 1)

5
arch/riscv/kernel/sys_hwprobe.c
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@ -15,6 +15,7 @@
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/vector.h>
#include <asm/vendor_extensions/sifive_hwprobe.h>
#include <asm/vendor_extensions/thead_hwprobe.h>
#include <vdso/vsyscall.h>
@ -300,6 +301,10 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
pair->value = riscv_timebase;
break;
case RISCV_HWPROBE_KEY_VENDOR_EXT_SIFIVE_0:
hwprobe_isa_vendor_ext_sifive_0(pair, cpus);
break;
case RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0:
hwprobe_isa_vendor_ext_thead_0(pair, cpus);
break;

1
arch/riscv/kernel/vendor_extensions/Makefile
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@ -2,5 +2,6 @@
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES) += andes.o
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_SIFIVE) += sifive.o
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_SIFIVE) += sifive_hwprobe.o
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) += thead.o
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) += thead_hwprobe.o

20
arch/riscv/kernel/vendor_extensions/sifive_hwprobe.c Normal file
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@ -0,0 +1,20 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <asm/vendor_extensions/sifive.h>
#include <asm/vendor_extensions/sifive_hwprobe.h>
#include <asm/vendor_extensions/vendor_hwprobe.h>
#include <linux/cpumask.h>
#include <linux/types.h>
#include <uapi/asm/hwprobe.h>
#include <uapi/asm/vendor/sifive.h>
void hwprobe_isa_vendor_ext_sifive_0(struct riscv_hwprobe *pair, const struct cpumask *cpus)
{
VENDOR_EXTENSION_SUPPORTED(pair, cpus,
riscv_isa_vendor_ext_list_sifive.per_hart_isa_bitmap, {
VENDOR_EXT_KEY(XSFVQMACCDOD);
VENDOR_EXT_KEY(XSFVQMACCQOQ);
});
}