Hannah Williams (hannah.williams@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15050
-gerrit
commit 8a10bdf9173a0fb065c8c21316db17476bd08ea2 Author: Hannah Williams hannah.williams@intel.com Date: Mon Apr 18 13:40:04 2016 -0700
soc/intel/common: Add common code for acpi c/p/t-state entries
Change-Id: I87505bb31cd1b46d27cc5c9ba8d086df7393653e Signed-off-by: Hannah Williams hannah.williams@intel.com --- src/soc/intel/common/Kconfig | 4 + src/soc/intel/common/Makefile.inc | 1 + src/soc/intel/common/acpi.h | 55 +++++++ src/soc/intel/common/acpi/acpi.c | 297 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 357 insertions(+)
diff --git a/src/soc/intel/common/Kconfig b/src/soc/intel/common/Kconfig index 0a5e935..e64aabf 100644 --- a/src/soc/intel/common/Kconfig +++ b/src/soc/intel/common/Kconfig @@ -80,4 +80,8 @@ config SOC_INTEL_COMMON_SMI bool default n
+config SOC_INTEL_COMMON_ACPI + bool + default n + endif # SOC_INTEL_COMMON diff --git a/src/soc/intel/common/Makefile.inc b/src/soc/intel/common/Makefile.inc index deda50a..8e4a793 100644 --- a/src/soc/intel/common/Makefile.inc +++ b/src/soc/intel/common/Makefile.inc @@ -16,6 +16,7 @@ ramstage-$(CONFIG_MMA) += mma.c ramstage-$(CONFIG_SOC_INTEL_COMMON_ACPI_WAKE_SOURCE) += acpi_wake_source.c ramstage-y += vbt.c ramstage-$(CONFIG_SOC_INTEL_COMMON_GFX_OPREGION) += opregion.c +ramstage-$(CONFIG_SOC_INTEL_COMMON_ACPI) += ./acpi/acpi.c
smm-$(CONFIG_SOC_INTEL_COMMON_SMI) += smihandler.c
diff --git a/src/soc/intel/common/acpi.h b/src/soc/intel/common/acpi.h index f7d5038..96b0074 100644 --- a/src/soc/intel/common/acpi.h +++ b/src/soc/intel/common/acpi.h @@ -29,4 +29,59 @@ */ int soc_fill_acpi_wake(uint32_t *pm1, uint32_t **gpe0);
+#if IS_ENABLED(CONFIG_SOC_INTEL_COMMON_ACPI) + +/* + * cpu_get_bus_clock returns the bus clock frequency. This is the value the + * clock ratio is multiplied with. + */ +uint32_t cpu_get_bus_clock(void); + +/* + * cpu_get_coord_type returns coordination type (SW_ANY or SW_ALL or HW_ALL) + * which is used to populate _PSD object. + */ +int cpu_get_coord_type(void); + +/* + * cpu_config_tdp_levels returns the number of TDP levels supported + * by this processor + */ +int cpu_config_tdp_levels(void); + +/* + * cpu_get_min_ratio returns the minimum frequency ratio that is supported + * by this processor + */ +uint32_t cpu_get_min_ratio(void); + +/* + * cpu_get_max_ratio returns the nominal TDP ratio if available or the + * maximum non turbo frequency ratio for this processor + */ +uint32_t cpu_get_max_ratio(void); + +/* + * cpu_get_power_max calculates CPU TDP in mW + */ +uint32_t cpu_get_power_max(void); + +/* + * get_cstate_map returns a table of processor specific acpi_cstate_t entries + * and number of entries in the table + */ +acpi_cstate_t *soc_get_cstate_map(int *num_entries); + +/* + * get_soc_tss_table returns a table of processor specific acpi_tstate_t entries + * and number of entries in the table + */ +acpi_tstate_t *soc_get_tss_table(int *num_entries); + +/* + * soc_get_acpi_base_address returns the acpi base address for the SOC + */ +uint16_t soc_get_acpi_base_address(void); + +#endif /* CONFIG_SOC_INTEL_COMMON_ACPI */ #endif diff --git a/src/soc/intel/common/acpi/acpi.c b/src/soc/intel/common/acpi/acpi.c new file mode 100644 index 0000000..886d09d --- /dev/null +++ b/src/soc/intel/common/acpi/acpi.c @@ -0,0 +1,297 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <arch/acpi.h> +#include <arch/acpigen.h> +#include <arch/cpu.h> +#include <cpu/intel/turbo.h> +#include <cpu/x86/msr.h> +#include <soc/intel/common/acpi.h> +#include <soc/pm.h> + +#define MSR_PLATFORM_INFO 0xce +#define MSR_TURBO_RATIO_LIMIT 0x1ad +#define MSR_CONFIG_TDP_NOMINAL 0x648 +#define MSR_RAPL_POWER_UNIT 0x606 +#define MSR_PKG_POWER_INFO 0x614 + +/* P-state configuration */ +#define PSS_MAX_ENTRIES 8 +#define PSS_RATIO_STEP 2 +#define PSS_LATENCY_TRANSITION 10 +#define PSS_LATENCY_BUSMASTER 10 + +/* CPU Bus clock frequency(in MHz) */ +#define CPU_BCLK 100 + +__attribute__((weak)) int cpu_get_coord_type(void) +{ + return HW_ALL; +} + +__attribute__((weak)) int cpu_config_tdp_levels(void) +{ + return 0; +} + +__attribute__((weak)) uint32_t cpu_get_min_ratio(void) +{ + msr_t msr; + /* Get bus ratio limits and calculate clock speeds */ + msr = rdmsr(MSR_PLATFORM_INFO); + return ((msr.hi >> 8) & 0xff); /* Max Efficiency Ratio */ +} + +__attribute__((weak)) uint32_t cpu_get_max_ratio(void) +{ + msr_t msr; + uint32_t ratio_max; + if (cpu_config_tdp_levels()) { + /* Set max ratio to nominal TDP ratio */ + msr = rdmsr(MSR_CONFIG_TDP_NOMINAL); + ratio_max = msr.lo & 0xff; + } else { + msr = rdmsr(MSR_PLATFORM_INFO); + /* Max Non-Turbo Ratio */ + ratio_max = (msr.lo >> 8) & 0xff; + } + return ratio_max; +} + +__attribute__((weak)) uint32_t cpu_get_bus_clock(void) +{ + /* CPU bus clock is fixed at 100MHz */ + return CPU_BCLK; +} + +__attribute__((weak)) uint32_t cpu_get_power_max(void) +{ + msr_t msr; + int power_unit; + + msr = rdmsr(MSR_RAPL_POWER_UNIT); + power_unit = 2 << ((msr.lo & 0xf) - 1); + msr = rdmsr(MSR_PKG_POWER_INFO); + return ((msr.lo & 0x7fff) / power_unit) * 1000; +} + +__attribute__((weak)) acpi_cstate_t *soc_get_cstate_map(int *entries) +{ + *entries = 0; + return NULL; +} + +__attribute__((weak)) acpi_tstate_t *soc_get_tss_table(int *entries) +{ + *entries = 0; + return NULL; +} + +__attribute__((weak)) uint16_t soc_get_acpi_base_address(void) +{ +#define ACPI_BASE_ADDR 0x400 + return (ACPI_BASE_ADDR); +} + +static int calculate_power(int tdp, int p1_ratio, int ratio) +{ + u32 m; + u32 power; + + /* + * M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2 + * + * Power = (ratio / p1_ratio) * m * tdp + */ + + m = (110000 - ((p1_ratio - ratio) * 625)) / 11; + m = (m * m) / 1000; + + power = ((ratio * 100000 / p1_ratio) / 100); + power *= (m / 100) * (tdp / 1000); + power /= 1000; + return power; +} + +static int get_cores_per_package(void) +{ + struct cpuinfo_x86 c; + struct cpuid_result result; + int cores = 1; + + get_fms(&c, cpuid_eax(1)); + if (c.x86 != 6) + return 1; + + result = cpuid_ext(0xb, 1); + cores = result.ebx & 0xff; + + return cores; +} + +static void generate_p_state_entries(int core, int cores_per_package) +{ + int ratio_min, ratio_max, ratio_turbo, ratio_step; + int coord_type, power_max, num_entries; + int ratio, power, clock, clock_max; + msr_t msr; + + coord_type = cpu_get_coord_type(); + ratio_min = cpu_get_min_ratio(); + ratio_max = cpu_get_max_ratio(); + clock_max = ratio_max * cpu_get_bus_clock(); + + /* Calculate CPU TDP in mW */ + power_max = cpu_get_power_max(); + + /* Write _PCT indicating use of FFixedHW */ + acpigen_write_empty_PCT(); + + /* Write _PPC with no limit on supported P-state */ + acpigen_write_PPC_NVS(); + /* Write PSD indicating configured coordination type */ + acpigen_write_PSD_package(core, 1, coord_type); + + /* Add P-state entries in _PSS table */ + acpigen_write_name("_PSS"); + + /* Determine ratio points */ + ratio_step = PSS_RATIO_STEP; + num_entries = ((ratio_max - ratio_min) / ratio_step) + 1; + if (num_entries > PSS_MAX_ENTRIES) { + ratio_step += 1; + num_entries = ((ratio_max - ratio_min) / ratio_step) + 1; + } + + /* P[T] is Turbo state if enabled */ + if (get_turbo_state() == TURBO_ENABLED) { + /* _PSS package count including Turbo */ + acpigen_write_package(num_entries + 2); + msr = rdmsr(MSR_TURBO_RATIO_LIMIT); + ratio_turbo = msr.lo & 0xff; + + /* Add entry for Turbo ratio */ + acpigen_write_PSS_package( + clock_max + 1, /* MHz */ + power_max, /* mW */ + PSS_LATENCY_TRANSITION, /* lat1 */ + PSS_LATENCY_BUSMASTER, /* lat2 */ + ratio_turbo << 8, /* control */ + ratio_turbo << 8); /* status */ + } else { + /* _PSS package count without Turbo */ + acpigen_write_package(num_entries + 1); + } + + /* First regular entry is max non-turbo ratio */ + acpigen_write_PSS_package( + clock_max, /* MHz */ + power_max, /* mW */ + PSS_LATENCY_TRANSITION, /* lat1 */ + PSS_LATENCY_BUSMASTER, /* lat2 */ + ratio_max << 8, /* control */ + ratio_max << 8); /* status */ + + /* Generate the remaining entries */ + for (ratio = ratio_min + ((num_entries - 1) * ratio_step); + ratio >= ratio_min; ratio -= ratio_step) { + + /* Calculate power at this ratio */ + power = calculate_power(power_max, ratio_max, ratio); + clock = ratio * CPU_BCLK; + + acpigen_write_PSS_package( + clock, /* MHz */ + power, /* mW */ + PSS_LATENCY_TRANSITION, /* lat1 */ + PSS_LATENCY_BUSMASTER, /* lat2 */ + ratio << 8, /* control */ + ratio << 8); /* status */ + } + /* Fix package length */ + acpigen_pop_len(); +} + +static void generate_c_state_entries(void) +{ + acpi_cstate_t *c_state_map; + int entries; + + c_state_map = soc_get_cstate_map(&entries); + + /* Generate C-state tables */ + acpigen_write_CST_package(c_state_map, entries); +} + +static void generate_t_state_entries(int core, int cores_per_package) +{ + acpi_tstate_t *soc_tss_table; + int entries; + + soc_tss_table = soc_get_tss_table(&entries); + if (entries == 0) + return; + + /* Indicate SW_ALL coordination for T-states */ + acpigen_write_TSD_package(core, cores_per_package, SW_ALL); + + /* Indicate FFixedHW so OS will use MSR */ + acpigen_write_empty_PTC(); + + /* Set NVS controlled T-state limit */ + acpigen_write_TPC("\TLVL"); + + /* Write TSS table for MSR access */ + acpigen_write_TSS_package(entries, soc_tss_table); +} + +void generate_cpu_entries(device_t device) +{ + int core_id, cpu_id, pcontrol_blk = soc_get_acpi_base_address(); + int plen = 6; + int totalcores = dev_count_cpu(); + int cores_per_package = get_cores_per_package(); + int numcpus = totalcores / cores_per_package; + + printk(BIOS_DEBUG, "Found %d CPU(s) with %d core(s) each.\n", + numcpus, cores_per_package); + + for (cpu_id=0; cpu_id < numcpus; cpu_id++) { + for (core_id=0; core_id < cores_per_package; core_id++) { + if (core_id > 0) { + pcontrol_blk = 0; + plen = 0; + } + + /* Generate processor _PR.CPUx */ + acpigen_write_processor( + (cpu_id)*cores_per_package + core_id, + pcontrol_blk, plen); + + /* Generate P-state tables */ + generate_p_state_entries( + core_id, cores_per_package); + + /* Generate C-state tables */ + generate_c_state_entries(); + + /* Generate T-state tables */ + generate_t_state_entries( + core_id, cores_per_package); + + acpigen_pop_len(); + } + } +}