UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems 

commit 280b68a3b3 upstream.

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 <puwen@hygon.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210528081417.31474-1-puwen@hygon.cn
Signed-off-by: Pu Wen <puwen@hygon.cn>
Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com>
Reviewed-by: Bin Lai <robinlai@tencent.com>
Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com>
Reviewed-by: caelli <caelli@tencent.com>
Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
This commit is contained in:
Pu Wen 2021-05-28 16:14:17 +08:00 committed by Jianping Liu
parent 0684f6615b
commit 6c20e20ff5
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/kernel/acpi/cstate.c
View File

@ -197,7 +197,8 @@ static int __init ffh_cstate_init(void)
struct cpuinfo_x86 *c = &boot_cpu_data; struct cpuinfo_x86 *c = &boot_cpu_data;
if (c->x86_vendor != X86_VENDOR_INTEL && 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; return -1;
cpu_cstate_entry = alloc_percpu(struct cstate_entry); cpu_cstate_entry = alloc_percpu(struct cstate_entry);