x86/cpufeatures: Add HWP highest perf change feature flag

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>

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 6c128d463a143c53bce2dc6a82d8c6f0dc76ad4d..0d99515530d36d8b0db1e5e7c56afa6804839efe 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -361,6 +361,7 @@
 #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 */