[V1,4/6] cpufreq: amd-pstate: Update AMD Pstate Preferred Core ranking dynamically
Commit Message
Preferred core rankings can be changed dynamically by the
platform based on the workload and platform conditions and
accounting for thermals and aging.
When this occurs, cpu priority need to be set.
Signed-off-by: Meng Li <li.meng@amd.com>
---
drivers/cpufreq/amd-pstate.c | 32 ++++++++++++++++++++++++++++++++
include/linux/amd-pstate.h | 1 +
2 files changed, 33 insertions(+)
@@ -320,6 +320,7 @@ static int pstate_init_perf(struct amd_cpudata *cpudata)
WRITE_ONCE(cpudata->nominal_perf, AMD_CPPC_NOMINAL_PERF(cap1));
WRITE_ONCE(cpudata->lowest_nonlinear_perf, AMD_CPPC_LOWNONLIN_PERF(cap1));
WRITE_ONCE(cpudata->lowest_perf, AMD_CPPC_LOWEST_PERF(cap1));
+ WRITE_ONCE(cpudata->prefcore_highest_perf, AMD_CPPC_HIGHEST_PERF(cap1));
return 0;
}
@@ -341,6 +342,7 @@ static int cppc_init_perf(struct amd_cpudata *cpudata)
WRITE_ONCE(cpudata->lowest_nonlinear_perf,
cppc_perf.lowest_nonlinear_perf);
WRITE_ONCE(cpudata->lowest_perf, cppc_perf.lowest_perf);
+ WRITE_ONCE(cpudata->prefcore_highest_perf, cppc_perf.highest_perf);
if (cppc_state == AMD_PSTATE_ACTIVE)
return 0;
@@ -743,6 +745,34 @@ static void amd_pstate_init_prefcore(void)
schedule_work(&sched_prefcore_work);
}
+static void amd_pstate_update_highest_perf(unsigned int cpu)
+{
+ struct cpufreq_policy *policy;
+ struct amd_cpudata *cpudata;
+ u32 prev_high = 0, cur_high = 0;
+ u64 highest_perf;
+ int ret;
+
+ if (!prefcore_enabled)
+ return;
+
+ ret = amd_pstate_get_highest_perf(cpu, &highest_perf);
+ if (ret)
+ return;
+
+ policy = cpufreq_cpu_get(cpu);
+ cpudata = policy->driver_data;
+ cur_high = highest_perf;
+ prev_high = READ_ONCE(cpudata->prefcore_highest_perf);
+
+ if (prev_high != cur_high) {
+ WRITE_ONCE(cpudata->prefcore_highest_perf, cur_high);
+ sched_set_itmt_core_prio(cur_high, cpu);
+ }
+
+ cpufreq_cpu_put(policy);
+}
+
/*
* Check if AMD Pstate Preferred core feature is supported and enabled
* 1) no_prefcore is used to enable or disable AMD Pstate Preferred Core
@@ -1497,6 +1527,7 @@ static struct cpufreq_driver amd_pstate_driver = {
.suspend = amd_pstate_cpu_suspend,
.resume = amd_pstate_cpu_resume,
.set_boost = amd_pstate_set_boost,
+ .update_highest_perf = amd_pstate_update_highest_perf,
.name = "amd-pstate",
.attr = amd_pstate_attr,
};
@@ -1511,6 +1542,7 @@ static struct cpufreq_driver amd_pstate_epp_driver = {
.online = amd_pstate_epp_cpu_online,
.suspend = amd_pstate_epp_suspend,
.resume = amd_pstate_epp_resume,
+ .update_highest_perf = amd_pstate_update_highest_perf,
.name = "amd-pstate-epp",
.attr = amd_pstate_epp_attr,
};
@@ -70,6 +70,7 @@ struct amd_cpudata {
u32 nominal_perf;
u32 lowest_nonlinear_perf;
u32 lowest_perf;
+ u32 prefcore_highest_perf;
u32 max_freq;
u32 min_freq;