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Add support for "Fast CPPC" which allows some CPUs to operate a tighter

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loop for passive mode.
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Merge tag 'amd-pstate-v6.11-2024-06-11' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux

Merge amd-pstate driver updates for v6.11 from Mario Mario Limonciello:

"Add support for "Fast CPPC" which allows some CPUs to operate a tighter
 loop for passive mode."

* tag 'amd-pstate-v6.11-2024-06-11' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux:
  cpufreq: amd-pstate: change cpu freq transition delay for some models
  x86/cpufeatures: Add AMD FAST CPPC feature flag
This commit is contained in:
Rafael J. Wysocki 2024-06-14 15:33:41 +02:00
commit 8e184ac079
3 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/cpufeatures.h
View File

@ -470,6 +470,7 @@
#define X86_FEATURE_BHI_CTRL (21*32+ 2) /* "" BHI_DIS_S HW control available */
#define X86_FEATURE_CLEAR_BHB_HW (21*32+ 3) /* "" BHI_DIS_S HW control enabled */
#define X86_FEATURE_CLEAR_BHB_LOOP_ON_VMEXIT (21*32+ 4) /* "" Clear branch history at vmexit using SW loop */
#define X86_FEATURE_FAST_CPPC (21*32 + 5) /* "" AMD Fast CPPC */
/*
* BUG word(s)

1
arch/x86/kernel/cpu/scattered.c
View File

@ -45,6 +45,7 @@ static const struct cpuid_bit cpuid_bits[] = {
{ X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
{ X86_FEATURE_FAST_CPPC, CPUID_EDX, 15, 0x80000007, 0 },
{ X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 },
{ X86_FEATURE_SMBA, CPUID_EBX, 2, 0x80000020, 0 },
{ X86_FEATURE_BMEC, CPUID_EBX, 3, 0x80000020, 0 },

9
drivers/cpufreq/amd-pstate.c
View File

@ -51,6 +51,7 @@
#define AMD_PSTATE_TRANSITION_LATENCY 20000
#define AMD_PSTATE_TRANSITION_DELAY 1000
#define AMD_PSTATE_FAST_CPPC_TRANSITION_DELAY 600
#define CPPC_HIGHEST_PERF_PERFORMANCE 196
#define CPPC_HIGHEST_PERF_DEFAULT 166
@ -849,8 +850,12 @@ static u32 amd_pstate_get_transition_delay_us(unsigned int cpu)
u32 transition_delay_ns;
transition_delay_ns = cppc_get_transition_latency(cpu);
if (transition_delay_ns == CPUFREQ_ETERNAL)
return AMD_PSTATE_TRANSITION_DELAY;
if (transition_delay_ns == CPUFREQ_ETERNAL) {
if (cpu_feature_enabled(X86_FEATURE_FAST_CPPC))
return AMD_PSTATE_FAST_CPPC_TRANSITION_DELAY;
else
return AMD_PSTATE_TRANSITION_DELAY;
}
return transition_delay_ns / NSEC_PER_USEC;
}