diff options
| -rw-r--r-- | Documentation/admin-guide/pm/amd-pstate.rst | 16 | ||||
| -rw-r--r-- | arch/x86/include/asm/msr-index.h | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/acpi-cpufreq.c | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 122 | ||||
| -rw-r--r-- | drivers/cpufreq/amd-pstate.h | 1 |
5 files changed, 119 insertions, 24 deletions
diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index f5ee81419a93..d0324d44f548 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -281,6 +281,22 @@ integer values defined between 0 to 255 when EPP feature is enabled by platform firmware, if EPP feature is disabled, driver will ignore the written value This attribute is read-write. +``boost`` +The `boost` sysfs attribute provides control over the CPU core +performance boost, allowing users to manage the maximum frequency limitation +of the CPU. This attribute can be used to enable or disable the boost feature +on individual CPUs. + +When the boost feature is enabled, the CPU can dynamically increase its frequency +beyond the base frequency, providing enhanced performance for demanding workloads. +On the other hand, disabling the boost feature restricts the CPU to operate at the +base frequency, which may be desirable in certain scenarios to prioritize power +efficiency or manage temperature. + +To manipulate the `boost` attribute, users can write a value of `0` to disable the +boost or `1` to enable it, for the respective CPU using the sysfs path +`/sys/devices/system/cpu/cpuX/cpufreq/boost`, where `X` represents the CPU number. + Other performance and frequency values can be read back from ``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`. diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index e022e6eb766c..384739d592af 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -781,6 +781,8 @@ #define MSR_K7_HWCR_IRPERF_EN BIT_ULL(MSR_K7_HWCR_IRPERF_EN_BIT) #define MSR_K7_FID_VID_CTL 0xc0010041 #define MSR_K7_FID_VID_STATUS 0xc0010042 +#define MSR_K7_HWCR_CPB_DIS_BIT 25 +#define MSR_K7_HWCR_CPB_DIS BIT_ULL(MSR_K7_HWCR_CPB_DIS_BIT) /* K6 MSRs */ #define MSR_K6_WHCR 0xc0000082 diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 37f1cdf46d29..2fc82831bddd 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -50,8 +50,6 @@ enum { #define AMD_MSR_RANGE (0x7) #define HYGON_MSR_RANGE (0x7) -#define MSR_K7_HWCR_CPB_DIS (1ULL << 25) - struct acpi_cpufreq_data { unsigned int resume; unsigned int cpu_feature; diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index afcf398574f6..80eaa58f1405 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -514,6 +514,7 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf, unsigned long max_freq; struct cpufreq_policy *policy = cpufreq_cpu_get(cpudata->cpu); u64 prev = READ_ONCE(cpudata->cppc_req_cached); + u32 nominal_perf = READ_ONCE(cpudata->nominal_perf); u64 value = prev; min_perf = clamp_t(unsigned long, min_perf, cpudata->min_limit_perf, @@ -536,6 +537,10 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf, value &= ~AMD_CPPC_DES_PERF(~0L); value |= AMD_CPPC_DES_PERF(des_perf); + /* limit the max perf when core performance boost feature is disabled */ + if (!cpudata->boost_supported) + max_perf = min_t(unsigned long, nominal_perf, max_perf); + value &= ~AMD_CPPC_MAX_PERF(~0L); value |= AMD_CPPC_MAX_PERF(max_perf); @@ -679,43 +684,105 @@ static void amd_pstate_adjust_perf(unsigned int cpu, cpufreq_cpu_put(policy); } -static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) +static int amd_pstate_cpu_boost_update(struct cpufreq_policy *policy, bool on) { struct amd_cpudata *cpudata = policy->driver_data; + struct cppc_perf_ctrls perf_ctrls; + u32 highest_perf, nominal_perf, nominal_freq, max_freq; int ret; - if (!cpudata->boost_supported) { - pr_err("Boost mode is not supported by this processor or SBIOS\n"); - return -EINVAL; + highest_perf = READ_ONCE(cpudata->highest_perf); + nominal_perf = READ_ONCE(cpudata->nominal_perf); + nominal_freq = READ_ONCE(cpudata->nominal_freq); + max_freq = READ_ONCE(cpudata->max_freq); + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + u64 value = READ_ONCE(cpudata->cppc_req_cached); + + value &= ~GENMASK_ULL(7, 0); + value |= on ? highest_perf : nominal_perf; + WRITE_ONCE(cpudata->cppc_req_cached, value); + + wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value); + } else { + perf_ctrls.max_perf = on ? highest_perf : nominal_perf; + ret = cppc_set_perf(cpudata->cpu, &perf_ctrls); + if (ret) { + cpufreq_cpu_release(policy); + pr_debug("Failed to set max perf on CPU:%d. ret:%d\n", + cpudata->cpu, ret); + return ret; + } } - if (state) - policy->cpuinfo.max_freq = cpudata->max_freq; - else - policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000; + if (on) + policy->cpuinfo.max_freq = max_freq; + else if (policy->cpuinfo.max_freq > nominal_freq * 1000) + policy->cpuinfo.max_freq = nominal_freq * 1000; policy->max = policy->cpuinfo.max_freq; - ret = freq_qos_update_request(&cpudata->req[1], - policy->cpuinfo.max_freq); - if (ret < 0) - return ret; + if (cppc_state == AMD_PSTATE_PASSIVE) { + ret = freq_qos_update_request(&cpudata->req[1], policy->cpuinfo.max_freq); + if (ret < 0) + pr_debug("Failed to update freq constraint: CPU%d\n", cpudata->cpu); + } - return 0; + return ret < 0 ? ret : 0; } -static void amd_pstate_boost_init(struct amd_cpudata *cpudata) +static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) { - u32 highest_perf, nominal_perf; + struct amd_cpudata *cpudata = policy->driver_data; + int ret; - highest_perf = READ_ONCE(cpudata->highest_perf); - nominal_perf = READ_ONCE(cpudata->nominal_perf); + if (!cpudata->boost_supported) { + pr_err("Boost mode is not supported by this processor or SBIOS\n"); + return -EOPNOTSUPP; + } + mutex_lock(&amd_pstate_driver_lock); + ret = amd_pstate_cpu_boost_update(policy, state); + WRITE_ONCE(cpudata->boost_state, !ret ? state : false); + policy->boost_enabled = !ret ? state : false; + refresh_frequency_limits(policy); + mutex_unlock(&amd_pstate_driver_lock); - if (highest_perf <= nominal_perf) - return; + return ret; +} - cpudata->boost_supported = true; +static int amd_pstate_init_boost_support(struct amd_cpudata *cpudata) +{ + u64 boost_val; + int ret = -1; + + /* + * If platform has no CPB support or disable it, initialize current driver + * boost_enabled state to be false, it is not an error for cpufreq core to handle. + */ + if (!cpu_feature_enabled(X86_FEATURE_CPB)) { + pr_debug_once("Boost CPB capabilities not present in the processor\n"); + ret = 0; + goto exit_err; + } + + /* at least one CPU supports CPB, even if others fail later on to set up */ current_pstate_driver->boost_enabled = true; + + ret = rdmsrl_on_cpu(cpudata->cpu, MSR_K7_HWCR, &boost_val); + if (ret) { + pr_err_once("failed to read initial CPU boost state!\n"); + ret = -EIO; + goto exit_err; + } + + if (!(boost_val & MSR_K7_HWCR_CPB_DIS)) + cpudata->boost_supported = true; + + return 0; + +exit_err: + cpudata->boost_supported = false; + return ret; } static void amd_perf_ctl_reset(unsigned int cpu) @@ -968,6 +1035,10 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) if (ret) goto free_cpudata1; + ret = amd_pstate_init_boost_support(cpudata); + if (ret) + goto free_cpudata1; + min_freq = READ_ONCE(cpudata->min_freq); max_freq = READ_ONCE(cpudata->max_freq); @@ -980,6 +1051,8 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) policy->cpuinfo.min_freq = min_freq; policy->cpuinfo.max_freq = max_freq; + policy->boost_enabled = READ_ONCE(cpudata->boost_supported); + /* It will be updated by governor */ policy->cur = policy->cpuinfo.min_freq; @@ -1005,7 +1078,6 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) policy->driver_data = cpudata; - amd_pstate_boost_init(cpudata); if (!current_pstate_driver->adjust_perf) current_pstate_driver->adjust_perf = amd_pstate_adjust_perf; @@ -1420,6 +1492,10 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) if (ret) goto free_cpudata1; + ret = amd_pstate_init_boost_support(cpudata); + if (ret) + goto free_cpudata1; + min_freq = READ_ONCE(cpudata->min_freq); max_freq = READ_ONCE(cpudata->max_freq); @@ -1435,6 +1511,8 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) policy->min = policy->cpuinfo.min_freq; policy->max = policy->cpuinfo.max_freq; + policy->boost_enabled = READ_ONCE(cpudata->boost_supported); + /* * Set the policy to provide a valid fallback value in case * the default cpufreq governor is neither powersave nor performance. @@ -1456,7 +1534,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) return ret; WRITE_ONCE(cpudata->cppc_cap1_cached, value); } - amd_pstate_boost_init(cpudata); return 0; @@ -1718,6 +1795,7 @@ static struct cpufreq_driver amd_pstate_epp_driver = { .suspend = amd_pstate_epp_suspend, .resume = amd_pstate_epp_resume, .update_limits = amd_pstate_update_limits, + .set_boost = amd_pstate_set_boost, .name = "amd-pstate-epp", .attr = amd_pstate_epp_attr, }; diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h index f80b33fa5d43..cc8bb2bc325a 100644 --- a/drivers/cpufreq/amd-pstate.h +++ b/drivers/cpufreq/amd-pstate.h @@ -100,6 +100,7 @@ struct amd_cpudata { u64 cppc_cap1_cached; bool suspended; s16 epp_default; + bool boost_state; }; #endif /* _LINUX_AMD_PSTATE_H */ |