diff options
Diffstat (limited to 'drivers/cpufreq/amd-pstate.c')
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 131 |
1 files changed, 102 insertions, 29 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index ddd346a239e0..81fba0dcbee9 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -62,7 +62,8 @@ static struct cpufreq_driver *current_pstate_driver; static struct cpufreq_driver amd_pstate_driver; static struct cpufreq_driver amd_pstate_epp_driver; -static int cppc_state = AMD_PSTATE_DISABLE; +static int cppc_state = AMD_PSTATE_UNDEFINED; +static bool cppc_enabled; /* * AMD Energy Preference Performance (EPP) @@ -228,7 +229,28 @@ static int amd_pstate_set_energy_pref_index(struct amd_cpudata *cpudata, static inline int pstate_enable(bool enable) { - return wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable); + int ret, cpu; + unsigned long logical_proc_id_mask = 0; + + if (enable == cppc_enabled) + return 0; + + for_each_present_cpu(cpu) { + unsigned long logical_id = topology_logical_die_id(cpu); + + if (test_bit(logical_id, &logical_proc_id_mask)) + continue; + + set_bit(logical_id, &logical_proc_id_mask); + + ret = wrmsrl_safe_on_cpu(cpu, MSR_AMD_CPPC_ENABLE, + enable); + if (ret) + return ret; + } + + cppc_enabled = enable; + return 0; } static int cppc_enable(bool enable) @@ -236,6 +258,9 @@ static int cppc_enable(bool enable) int cpu, ret = 0; struct cppc_perf_ctrls perf_ctrls; + if (enable == cppc_enabled) + return 0; + for_each_present_cpu(cpu) { ret = cppc_set_enable(cpu, enable); if (ret) @@ -251,6 +276,7 @@ static int cppc_enable(bool enable) } } + cppc_enabled = enable; return ret; } @@ -1045,6 +1071,26 @@ static const struct attribute_group amd_pstate_global_attr_group = { .attrs = pstate_global_attributes, }; +static bool amd_pstate_acpi_pm_profile_server(void) +{ + switch (acpi_gbl_FADT.preferred_profile) { + case PM_ENTERPRISE_SERVER: + case PM_SOHO_SERVER: + case PM_PERFORMANCE_SERVER: + return true; + } + return false; +} + +static bool amd_pstate_acpi_pm_profile_undefined(void) +{ + if (acpi_gbl_FADT.preferred_profile == PM_UNSPECIFIED) + return true; + if (acpi_gbl_FADT.preferred_profile >= NR_PM_PROFILES) + return true; + return false; +} + static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) { int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; @@ -1102,10 +1148,14 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) policy->max = policy->cpuinfo.max_freq; /* - * Set the policy to powersave to provide a valid fallback value in case + * Set the policy to provide a valid fallback value in case * the default cpufreq governor is neither powersave nor performance. */ - policy->policy = CPUFREQ_POLICY_POWERSAVE; + if (amd_pstate_acpi_pm_profile_server() || + amd_pstate_acpi_pm_profile_undefined()) + policy->policy = CPUFREQ_POLICY_PERFORMANCE; + else + policy->policy = CPUFREQ_POLICY_POWERSAVE; if (boot_cpu_has(X86_FEATURE_CPPC)) { ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &value); @@ -1356,10 +1406,29 @@ static struct cpufreq_driver amd_pstate_epp_driver = { .online = amd_pstate_epp_cpu_online, .suspend = amd_pstate_epp_suspend, .resume = amd_pstate_epp_resume, - .name = "amd_pstate_epp", + .name = "amd-pstate-epp", .attr = amd_pstate_epp_attr, }; +static int __init amd_pstate_set_driver(int mode_idx) +{ + if (mode_idx >= AMD_PSTATE_DISABLE && mode_idx < AMD_PSTATE_MAX) { + cppc_state = mode_idx; + if (cppc_state == AMD_PSTATE_DISABLE) + pr_info("driver is explicitly disabled\n"); + + if (cppc_state == AMD_PSTATE_ACTIVE) + current_pstate_driver = &amd_pstate_epp_driver; + + if (cppc_state == AMD_PSTATE_PASSIVE || cppc_state == AMD_PSTATE_GUIDED) + current_pstate_driver = &amd_pstate_driver; + + return 0; + } + + return -EINVAL; +} + static int __init amd_pstate_init(void) { struct device *dev_root; @@ -1367,15 +1436,6 @@ static int __init amd_pstate_init(void) if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) return -ENODEV; - /* - * by default the pstate driver is disabled to load - * enable the amd_pstate passive mode driver explicitly - * with amd_pstate=passive or other modes in kernel command line - */ - if (cppc_state == AMD_PSTATE_DISABLE) { - pr_info("driver load is disabled, boot with specific mode to enable this\n"); - return -ENODEV; - } if (!acpi_cpc_valid()) { pr_warn_once("the _CPC object is not present in SBIOS or ACPI disabled\n"); @@ -1386,6 +1446,33 @@ static int __init amd_pstate_init(void) if (cpufreq_get_current_driver()) return -EEXIST; + switch (cppc_state) { + case AMD_PSTATE_UNDEFINED: + /* Disable on the following configs by default: + * 1. Undefined platforms + * 2. Server platforms + * 3. Shared memory designs + */ + if (amd_pstate_acpi_pm_profile_undefined() || + amd_pstate_acpi_pm_profile_server() || + !boot_cpu_has(X86_FEATURE_CPPC)) { + pr_info("driver load is disabled, boot with specific mode to enable this\n"); + return -ENODEV; + } + ret = amd_pstate_set_driver(CONFIG_X86_AMD_PSTATE_DEFAULT_MODE); + if (ret) + return ret; + break; + case AMD_PSTATE_DISABLE: + return -ENODEV; + case AMD_PSTATE_PASSIVE: + case AMD_PSTATE_ACTIVE: + case AMD_PSTATE_GUIDED: + break; + default: + return -EINVAL; + } + /* capability check */ if (boot_cpu_has(X86_FEATURE_CPPC)) { pr_debug("AMD CPPC MSR based functionality is supported\n"); @@ -1438,21 +1525,7 @@ static int __init amd_pstate_param(char *str) size = strlen(str); mode_idx = get_mode_idx_from_str(str, size); - if (mode_idx >= AMD_PSTATE_DISABLE && mode_idx < AMD_PSTATE_MAX) { - cppc_state = mode_idx; - if (cppc_state == AMD_PSTATE_DISABLE) - pr_info("driver is explicitly disabled\n"); - - if (cppc_state == AMD_PSTATE_ACTIVE) - current_pstate_driver = &amd_pstate_epp_driver; - - if (cppc_state == AMD_PSTATE_PASSIVE || cppc_state == AMD_PSTATE_GUIDED) - current_pstate_driver = &amd_pstate_driver; - - return 0; - } - - return -EINVAL; + return amd_pstate_set_driver(mode_idx); } early_param("amd_pstate", amd_pstate_param); |