From: Pu Wen Date: Fri, 28 May 2021 08:14:17 +0000 (+0800) Subject: x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=280b68a3b3b96b027fcdeb5a3916a8e2aaf84d03;p=linux.git x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems 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. Signed-off-by: Pu Wen Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20210528081417.31474-1-puwen@hygon.cn --- diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 49ae4e1ac9cd8..7de599eba7f04 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);