mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
cpufreq: intel_pstate: Force HWP min perf before offline
Force HWP Request MAX = HWP Request MIN = HWP Capability MIN and EPP to 0xFF. In this way the performance limits on the offlined CPU will not influence performance limits on its sibling CPU, which is still online. If the sibling CPU is calling for higher performance, it will impact the max core performance. Here core performance will follow higher of the performance requests from each sibling. Reported-and-tested-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
6e218d21ac
commit
af3b7379e2
1 changed files with 26 additions and 2 deletions
|
@ -830,6 +830,28 @@ static void intel_pstate_hwp_set(unsigned int cpu)
|
|||
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
|
||||
}
|
||||
|
||||
static void intel_pstate_hwp_force_min_perf(int cpu)
|
||||
{
|
||||
u64 value;
|
||||
int min_perf;
|
||||
|
||||
value = all_cpu_data[cpu]->hwp_req_cached;
|
||||
value &= ~GENMASK_ULL(31, 0);
|
||||
min_perf = HWP_LOWEST_PERF(all_cpu_data[cpu]->hwp_cap_cached);
|
||||
|
||||
/* Set hwp_max = hwp_min */
|
||||
value |= HWP_MAX_PERF(min_perf);
|
||||
value |= HWP_MIN_PERF(min_perf);
|
||||
|
||||
/* Set EPP/EPB to min */
|
||||
if (static_cpu_has(X86_FEATURE_HWP_EPP))
|
||||
value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
|
||||
else
|
||||
intel_pstate_set_epb(cpu, HWP_EPP_BALANCE_POWERSAVE);
|
||||
|
||||
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
|
||||
}
|
||||
|
||||
static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
|
||||
{
|
||||
struct cpudata *cpu_data = all_cpu_data[policy->cpu];
|
||||
|
@ -2084,10 +2106,12 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
|
|||
pr_debug("CPU %d exiting\n", policy->cpu);
|
||||
|
||||
intel_pstate_clear_update_util_hook(policy->cpu);
|
||||
if (hwp_active)
|
||||
if (hwp_active) {
|
||||
intel_pstate_hwp_save_state(policy);
|
||||
else
|
||||
intel_pstate_hwp_force_min_perf(policy->cpu);
|
||||
} else {
|
||||
intel_cpufreq_stop_cpu(policy);
|
||||
}
|
||||
}
|
||||
|
||||
static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
|
||||
|
|
Loading…
Reference in a new issue