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x86/cpufeatures: Add HWP highest perf change feature flag

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BugLink: https://bugs.launchpad.net/bugs/2090852

When CPUID[6].EAX[15] is set to 1, this CPU supports notification for
HWP (Hardware P-states) highest performance change.

Add a feature flag to check if the CPU supports HWP highest performance
change.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20240624161109.1427640-2-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 7ea81936b85317aee8a73cd35d7f9cd6ce654dee)
Signed-off-by: Thibault Ferrante <thibault.ferrante@canonical.com>
Acked-by: Agathe Porte <agathe.porte@canonical.com>
Acked-by: Magali Lemes <magali.lemes@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Srinivas Pandruvada
2024-12-02 17:28:43 +01:00
committed by Mehmet Basaran
parent 59e4c08ecd
commit 4368f6eac6
1 changed files with 1 additions and 0 deletions
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arch/x86/include/asm/cpufeatures.h
+1
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@@ -359,6 +359,7 @@
#define X86_FEATURE_HWP_ACT_WINDOW (14*32+ 9) /* HWP Activity Window */
#define X86_FEATURE_HWP_EPP (14*32+10) /* HWP Energy Perf. Preference */
#define X86_FEATURE_HWP_PKG_REQ (14*32+11) /* HWP Package Level Request */
#define X86_FEATURE_HWP_HIGHEST_PERF_CHANGE (14*32+15) /* "" HWP Highest perf change */
#define X86_FEATURE_HFI (14*32+19) /* Hardware Feedback Interface */
/* AMD SVM Feature Identification, CPUID level 0x8000000a (EDX), word 15 */