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cpufreq: amd-pstate: Add boost mode support for AMD P-State

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If the sbios supports the boost mode of AMD P-State, let's switch to
boost enabled by default.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Huang Rui 2021-12-24 09:05:04 +08:00 committed by Rafael J. Wysocki
parent 60e10f896d
commit 41271016df
1 changed files with 66 additions and 3 deletions
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69
drivers/cpufreq/amd-pstate.c
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@ -87,6 +87,7 @@ static struct cpufreq_driver amd_pstate_driver;
struct amd_cpudata {
int cpu;
struct freq_qos_request req[2];
u64 cppc_req_cached;
u32 highest_perf;
@ -98,6 +99,8 @@ struct amd_cpudata {
u32 min_freq;
u32 nominal_freq;
u32 lowest_nonlinear_freq;
bool boost_supported;
};
static inline int pstate_enable(bool enable)
@ -374,6 +377,45 @@ static int amd_get_lowest_nonlinear_freq(struct amd_cpudata *cpudata)
return lowest_nonlinear_freq * 1000;
}
static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state)
{
struct amd_cpudata *cpudata = policy->driver_data;
int ret;
if (!cpudata->boost_supported) {
pr_err("Boost mode is not supported by this processor or SBIOS\n");
return -EINVAL;
}
if (state)
policy->cpuinfo.max_freq = cpudata->max_freq;
else
policy->cpuinfo.max_freq = cpudata->nominal_freq;
policy->max = policy->cpuinfo.max_freq;
ret = freq_qos_update_request(&cpudata->req[1],
policy->cpuinfo.max_freq);
if (ret < 0)
return ret;
return 0;
}
static void amd_pstate_boost_init(struct amd_cpudata *cpudata)
{
u32 highest_perf, nominal_perf;
highest_perf = READ_ONCE(cpudata->highest_perf);
nominal_perf = READ_ONCE(cpudata->nominal_perf);
if (highest_perf <= nominal_perf)
return;
cpudata->boost_supported = true;
amd_pstate_driver.boost_enabled = true;
}
static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
{
int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret;
@ -392,7 +434,7 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
ret = amd_pstate_init_perf(cpudata);
if (ret)
goto free_cpudata;
goto free_cpudata1;
min_freq = amd_get_min_freq(cpudata);
max_freq = amd_get_max_freq(cpudata);
@ -403,7 +445,7 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
dev_err(dev, "min_freq(%d) or max_freq(%d) value is incorrect\n",
min_freq, max_freq);
ret = -EINVAL;
goto free_cpudata;
goto free_cpudata1;
}
policy->cpuinfo.transition_latency = AMD_PSTATE_TRANSITION_LATENCY;
@ -421,6 +463,20 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
if (boot_cpu_has(X86_FEATURE_CPPC))
policy->fast_switch_possible = true;
ret = freq_qos_add_request(&policy->constraints, &cpudata->req[0],
FREQ_QOS_MIN, policy->cpuinfo.min_freq);
if (ret < 0) {
dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
goto free_cpudata1;
}
ret = freq_qos_add_request(&policy->constraints, &cpudata->req[1],
FREQ_QOS_MAX, policy->cpuinfo.max_freq);
if (ret < 0) {
dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
goto free_cpudata2;
}
/* Initial processor data capability frequencies */
cpudata->max_freq = max_freq;
cpudata->min_freq = min_freq;
@ -429,9 +485,13 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
policy->driver_data = cpudata;
amd_pstate_boost_init(cpudata);
return 0;
free_cpudata:
free_cpudata2:
freq_qos_remove_request(&cpudata->req[0]);
free_cpudata1:
kfree(cpudata);
return ret;
}
@ -442,6 +502,8 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
cpudata = policy->driver_data;
freq_qos_remove_request(&cpudata->req[1]);
freq_qos_remove_request(&cpudata->req[0]);
kfree(cpudata);
return 0;
@ -453,6 +515,7 @@ static struct cpufreq_driver amd_pstate_driver = {
.target = amd_pstate_target,
.init = amd_pstate_cpu_init,
.exit = amd_pstate_cpu_exit,
.set_boost = amd_pstate_set_boost,
.name = "amd-pstate",
};