Enabling cbo.clean and cbo.flush in user mode makes it more
convenient to manage the cache state and achieve better performance.
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Signed-off-by: Yunhui Cui <cuiyunhui@xxxxxxxxxxxxx>
---
arch/riscv/kernel/cpufeature.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index c0916ed318c2..60d180b98f52 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -30,6 +30,7 @@
#define NUM_ALPHA_EXTS ('z' - 'a' + 1)
static bool any_cpu_has_zicboz;
+static bool any_cpu_has_zicbom;
unsigned long elf_hwcap __read_mostly;
@@ -87,6 +88,8 @@ static int riscv_ext_zicbom_validate(const struct riscv_isa_ext_data *data,
pr_err("Zicbom disabled as cbom-block-size present, but is not a power-of-2\n");
return -EINVAL;
}
+
+ any_cpu_has_zicbom = true;
return 0;
}
@@ -944,6 +947,11 @@ void __init riscv_user_isa_enable(void)
current->thread.envcfg |= ENVCFG_CBZE;
else if (any_cpu_has_zicboz)
pr_warn("Zicboz disabled as it is unavailable on some harts\n");
+
+ if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICBOM))
+ current->thread.envcfg |= ENVCFG_CBCFE;
+ else if (any_cpu_has_zicbom)
+ pr_warn("Zicbom disabled as it is unavailable on some harts\n");
}
#ifdef CONFIG_RISCV_ALTERNATIVE
--
2.39.2
