Messages in this thread Patch in this message | | | From | Pu Wen <> | Subject | [PATCH] x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems | Date | Fri, 28 May 2021 16:14:17 +0800 |
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Hygon systems support the Monitor/Mwait instructions and these can be used for ACPI C1 in the same way as on AMD and Intel systems.
The BIOS declares a C1 state in _CST to use FFH and CPUID_Fn00000005_EDX is non-zero on Hygon systems.
Allow ffh_cstate_init() to succeed on Hygon systems to default using FFH MWAIT instead of HALT for ACPI C1.
Tested successfully on Hygon Fam18h systems.
Signed-off-by: Pu Wen <puwen@hygon.cn> --- arch/x86/kernel/acpi/cstate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 49ae4e1ac9cd..7de599eba7f0 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -197,7 +197,8 @@ static int __init ffh_cstate_init(void) struct cpuinfo_x86 *c = &boot_cpu_data; if (c->x86_vendor != X86_VENDOR_INTEL && - c->x86_vendor != X86_VENDOR_AMD) + c->x86_vendor != X86_VENDOR_AMD && + c->x86_vendor != X86_VENDOR_HYGON) return -1; cpu_cstate_entry = alloc_percpu(struct cstate_entry); -- 2.23.0
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