| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpigen.h> |
| #include <console/console.h> |
| #include <cpu/cpu.h> |
| #include <cpu/intel/msr.h> |
| #include <cpu/intel/turbo.h> |
| #include <cpu/x86/msr.h> |
| #include <types.h> |
| |
| #include "common.h" |
| |
| #define CPUID_6_ECX_EPB (1 << 3) |
| #define CPUID_6_ENGERY_PERF_PREF (1 << 10) |
| #define CPUID_6_HWP (1 << 7) |
| |
| void set_vmx_and_lock(void) |
| { |
| set_feature_ctrl_vmx(); |
| set_feature_ctrl_lock(); |
| } |
| |
| void set_feature_ctrl_vmx_arg(bool enable) |
| { |
| msr_t msr; |
| uint32_t feature_flag; |
| |
| feature_flag = cpu_get_feature_flags_ecx(); |
| /* Check that the VMX is supported before reading or writing the MSR. */ |
| if (!((feature_flag & CPUID_VMX) || (feature_flag & CPUID_SMX))) { |
| printk(BIOS_DEBUG, "CPU doesn't support VMX; exiting\n"); |
| return; |
| } |
| |
| msr = rdmsr(IA32_FEATURE_CONTROL); |
| |
| if (msr.lo & (1 << 0)) { |
| printk(BIOS_DEBUG, "IA32_FEATURE_CONTROL already locked; "); |
| printk(BIOS_DEBUG, "VMX status: %s\n", msr.lo & (1 << 2) ? |
| "enabled" : "disabled"); |
| /* IA32_FEATURE_CONTROL locked. If we set it again we get an |
| * illegal instruction |
| */ |
| return; |
| } |
| |
| /* The IA32_FEATURE_CONTROL MSR may initialize with random values. |
| * It must be cleared regardless of VMX config setting. |
| */ |
| msr.hi = msr.lo = 0; |
| |
| if (enable) { |
| msr.lo |= (1 << 2); |
| if (feature_flag & CPUID_SMX) { |
| msr.lo |= (1 << 1); |
| if (CONFIG(INTEL_TXT)) { |
| /* Enable GetSec and all GetSec leaves */ |
| msr.lo |= (0xff << 8); |
| } |
| } |
| } |
| |
| wrmsr(IA32_FEATURE_CONTROL, msr); |
| |
| printk(BIOS_DEBUG, "VMX status: %s\n", |
| enable ? "enabled" : "disabled"); |
| } |
| |
| void set_feature_ctrl_vmx(void) |
| { |
| set_feature_ctrl_vmx_arg(CONFIG(ENABLE_VMX)); |
| } |
| |
| void set_feature_ctrl_lock(void) |
| { |
| msr_t msr; |
| int lock = CONFIG(SET_IA32_FC_LOCK_BIT); |
| uint32_t feature_flag = cpu_get_feature_flags_ecx(); |
| |
| /* Check if VMX is supported before reading or writing the MSR */ |
| if (!((feature_flag & CPUID_VMX) || (feature_flag & CPUID_SMX))) { |
| printk(BIOS_DEBUG, "Read IA32_FEATURE_CONTROL unsupported\n"); |
| return; |
| } |
| |
| msr = rdmsr(IA32_FEATURE_CONTROL); |
| |
| if (msr.lo & (1 << 0)) { |
| printk(BIOS_DEBUG, "IA32_FEATURE_CONTROL already locked\n"); |
| /* IA32_FEATURE_CONTROL locked. If we set it again we get an |
| * illegal instruction |
| */ |
| return; |
| } |
| |
| if (lock) { |
| /* Set lock bit */ |
| msr.lo |= (1 << 0); |
| wrmsr(IA32_FEATURE_CONTROL, msr); |
| } |
| |
| printk(BIOS_DEBUG, "IA32_FEATURE_CONTROL status: %s\n", |
| lock ? "locked" : "unlocked"); |
| } |
| |
| /* |
| * Init cppc_config in a way that's appropriate for Intel |
| * processors with Intel Enhanced Speed Step Technology. |
| * NOTE: version 2 is expected to be the typical use case. |
| * For now this function 'punts' on version 3 and just |
| * populates the additional fields with 'unsupported'. |
| */ |
| void cpu_init_cppc_config(struct cppc_config *config, u32 version) |
| { |
| config->version = version; |
| |
| config->entries[CPPC_HIGHEST_PERF] = CPPC_REG_MSR(IA32_HWP_CAPABILITIES, 0, 8); |
| config->entries[CPPC_NOMINAL_PERF] = CPPC_REG_MSR(MSR_PLATFORM_INFO, 8, 8); |
| config->entries[CPPC_LOWEST_NONL_PERF] = CPPC_REG_MSR(IA32_HWP_CAPABILITIES, 16, 8); |
| config->entries[CPPC_LOWEST_PERF] = CPPC_REG_MSR(IA32_HWP_CAPABILITIES, 24, 8); |
| config->entries[CPPC_GUARANTEED_PERF] = CPPC_REG_MSR(IA32_HWP_CAPABILITIES, 8, 8); |
| config->entries[CPPC_DESIRED_PERF] = CPPC_REG_MSR(IA32_HWP_REQUEST, 16, 8); |
| config->entries[CPPC_MIN_PERF] = CPPC_REG_MSR(IA32_HWP_REQUEST, 0, 8); |
| config->entries[CPPC_MAX_PERF] = CPPC_REG_MSR(IA32_HWP_REQUEST, 8, 8); |
| config->entries[CPPC_PERF_REDUCE_TOLERANCE] = CPPC_UNSUPPORTED; |
| config->entries[CPPC_TIME_WINDOW] = CPPC_UNSUPPORTED; |
| config->entries[CPPC_COUNTER_WRAP] = CPPC_UNSUPPORTED; |
| config->entries[CPPC_REF_PERF_COUNTER] = CPPC_REG_MSR(IA32_MPERF, 0, 64); |
| config->entries[CPPC_DELIVERED_PERF_COUNTER] = CPPC_REG_MSR(IA32_APERF, 0, 64); |
| config->entries[CPPC_PERF_LIMITED] = CPPC_REG_MSR(IA32_HWP_STATUS, 2, 1); |
| config->entries[CPPC_ENABLE] = CPPC_REG_MSR(IA32_PM_ENABLE, 0, 1); |
| |
| if (version < 2) |
| return; |
| |
| config->entries[CPPC_AUTO_SELECT] = CPPC_DWORD(1); |
| config->entries[CPPC_AUTO_ACTIVITY_WINDOW] = CPPC_REG_MSR(IA32_HWP_REQUEST, 32, 10); |
| config->entries[CPPC_PERF_PREF] = CPPC_REG_MSR(IA32_HWP_REQUEST, 24, 8); |
| config->entries[CPPC_REF_PERF] = CPPC_UNSUPPORTED; |
| |
| if (version < 3) |
| return; |
| |
| config->entries[CPPC_LOWEST_FREQ] = CPPC_UNSUPPORTED; |
| config->entries[CPPC_NOMINAL_FREQ] = CPPC_UNSUPPORTED; |
| } |
| |
| void set_aesni_lock(void) |
| { |
| msr_t msr; |
| |
| if (!CONFIG(SET_MSR_AESNI_LOCK_BIT)) |
| return; |
| |
| if (!(cpu_get_feature_flags_ecx() & CPUID_AES)) |
| return; |
| |
| /* Only run once per core as specified in the MSR datasheet */ |
| if (intel_ht_sibling()) |
| return; |
| |
| msr = rdmsr(MSR_FEATURE_CONFIG); |
| if (msr.lo & AESNI_LOCK) |
| return; |
| |
| msr_set(MSR_FEATURE_CONFIG, AESNI_LOCK); |
| } |
| |
| void enable_lapic_tpr(void) |
| { |
| msr_unset(MSR_PIC_MSG_CONTROL, TPR_UPDATES_DISABLE); |
| } |
| |
| void configure_dca_cap(void) |
| { |
| if (cpu_get_feature_flags_ecx() & CPUID_DCA) |
| msr_set(IA32_PLATFORM_DCA_CAP, DCA_TYPE0_EN); |
| } |
| |
| void set_energy_perf_bias(u8 policy) |
| { |
| u8 epb = policy & ENERGY_POLICY_MASK; |
| |
| if (!(cpuid_ecx(6) & CPUID_6_ECX_EPB)) |
| return; |
| |
| msr_unset_and_set(IA32_ENERGY_PERF_BIAS, ENERGY_POLICY_MASK, epb); |
| printk(BIOS_DEBUG, "cpu: energy policy set to %u\n", epb); |
| } |
| |
| /* |
| * Check energy performance preference and HWP capabilities from Thermal and |
| * Power Management Leaf CPUID |
| */ |
| bool check_energy_perf_cap(void) |
| { |
| const u32 cap = cpuid_eax(CPUID_LEAF_PM); |
| if (!(cap & CPUID_6_ENGERY_PERF_PREF)) |
| return false; |
| if (!(cap & CPUID_6_HWP)) |
| return false; |
| return true; |
| } |
| |
| /* |
| * Instructs the CPU to use EPP hints. This means that any energy policies set |
| * up in `set_energy_perf_bias` will be ignored afterwards. |
| */ |
| void enable_energy_perf_pref(void) |
| { |
| msr_t msr = rdmsr(IA32_PM_ENABLE); |
| if (!(msr.lo & HWP_ENABLE)) { |
| /* Package-scoped MSR */ |
| printk(BIOS_DEBUG, "HWP_ENABLE: energy-perf preference in favor of energy-perf bias\n"); |
| msr_set(IA32_PM_ENABLE, HWP_ENABLE); |
| } |
| } |
| |
| /* |
| * Set the IA32_HWP_REQUEST Energy-Performance Preference bits on the logical |
| * thread. 0 is a hint to the HWP to prefer performance, and 255 is a hint to |
| * prefer energy efficiency. |
| * This function needs to be called when HWP_ENABLE is set. |
| */ |
| void set_energy_perf_pref(u8 pref) |
| { |
| msr_unset_and_set(IA32_HWP_REQUEST, IA32_HWP_REQUEST_EPP_MASK, |
| (uint64_t)pref << IA32_HWP_REQUEST_EPP_SHIFT); |
| } |