AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-03 17:26:40 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

x86/cpufeature: Enable RING3MWAIT for Knights Mill

Browse Source 
Enable ring 3 MONITOR/MWAIT for Intel Xeon Phi codenamed Knights Mill. We
can't guarantee that this (KNM) will be the last CPU model that needs this
hack.  But, we do recognize that this is far from optimal, and there is an
effort to ensure we don't keep doing extending this hack forever.

Signed-off-by: Piotr Luc <piotr.luc@intel.com>
Cc: Piotr.Luc@intel.com
Cc: dave.hansen@linux.intel.com
Link: http://lkml.kernel.org/r/1484918557-15481-6-git-send-email-grzegorz.andrejczuk@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Piotr Luc 2017-01-20 14:22:37 +01:00 committed by Thomas Gleixner
parent e16fd002af
commit 4d8bb00604
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/kernel/cpu/intel.c
View File

@ -79,8 +79,15 @@ static void probe_xeon_phi_r3mwait(struct cpuinfo_x86 *c)
* Ring 3 MONITOR/MWAIT feature cannot be detected without
* cpu model and family comparison.
*/
if (c->x86 != 6 || c->x86_model != INTEL_FAM6_XEON_PHI_KNL)
if (c->x86 != 6)
return;
switch (c->x86_model) {
case INTEL_FAM6_XEON_PHI_KNL:
case INTEL_FAM6_XEON_PHI_KNM:
break;
default:
return;
}
if (ring3mwait_disabled) {
msr_clear_bit(MSR_MISC_FEATURE_ENABLES,