225 lines
6.0 KiB
C
225 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel Running Average Power Limit (RAPL) Driver via MSR interface
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* Copyright (c) 2019, Intel Corporation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/log2.h>
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#include <linux/bitmap.h>
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#include <linux/delay.h>
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#include <linux/sysfs.h>
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#include <linux/cpu.h>
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#include <linux/powercap.h>
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#include <linux/suspend.h>
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#include <linux/intel_rapl.h>
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#include <linux/processor.h>
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#include <linux/platform_device.h>
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#include <asm/iosf_mbi.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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/* Local defines */
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#define MSR_PLATFORM_POWER_LIMIT 0x0000065C
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#define MSR_VR_CURRENT_CONFIG 0x00000601
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/* private data for RAPL MSR Interface */
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static struct rapl_if_priv *rapl_msr_priv;
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static struct rapl_if_priv rapl_msr_priv_intel = {
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.reg_unit = MSR_RAPL_POWER_UNIT,
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.regs[RAPL_DOMAIN_PACKAGE] = {
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MSR_PKG_POWER_LIMIT, MSR_PKG_ENERGY_STATUS, MSR_PKG_PERF_STATUS, 0, MSR_PKG_POWER_INFO },
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.regs[RAPL_DOMAIN_PP0] = {
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MSR_PP0_POWER_LIMIT, MSR_PP0_ENERGY_STATUS, 0, MSR_PP0_POLICY, 0 },
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.regs[RAPL_DOMAIN_PP1] = {
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MSR_PP1_POWER_LIMIT, MSR_PP1_ENERGY_STATUS, 0, MSR_PP1_POLICY, 0 },
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.regs[RAPL_DOMAIN_DRAM] = {
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MSR_DRAM_POWER_LIMIT, MSR_DRAM_ENERGY_STATUS, MSR_DRAM_PERF_STATUS, 0, MSR_DRAM_POWER_INFO },
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.regs[RAPL_DOMAIN_PLATFORM] = {
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MSR_PLATFORM_POWER_LIMIT, MSR_PLATFORM_ENERGY_STATUS, 0, 0, 0},
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.limits[RAPL_DOMAIN_PACKAGE] = 2,
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.limits[RAPL_DOMAIN_PLATFORM] = 2,
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};
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static struct rapl_if_priv rapl_msr_priv_amd = {
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.reg_unit = MSR_AMD_RAPL_POWER_UNIT,
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.regs[RAPL_DOMAIN_PACKAGE] = {
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0, MSR_AMD_PKG_ENERGY_STATUS, 0, 0, 0 },
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.regs[RAPL_DOMAIN_PP0] = {
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0, MSR_AMD_CORE_ENERGY_STATUS, 0, 0, 0 },
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};
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/* Handles CPU hotplug on multi-socket systems.
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* If a CPU goes online as the first CPU of the physical package
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* we add the RAPL package to the system. Similarly, when the last
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* CPU of the package is removed, we remove the RAPL package and its
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* associated domains. Cooling devices are handled accordingly at
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* per-domain level.
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*/
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static int rapl_cpu_online(unsigned int cpu)
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{
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struct rapl_package *rp;
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rp = rapl_find_package_domain(cpu, rapl_msr_priv);
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if (!rp) {
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rp = rapl_add_package(cpu, rapl_msr_priv);
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if (IS_ERR(rp))
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return PTR_ERR(rp);
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}
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cpumask_set_cpu(cpu, &rp->cpumask);
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return 0;
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}
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static int rapl_cpu_down_prep(unsigned int cpu)
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{
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struct rapl_package *rp;
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int lead_cpu;
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rp = rapl_find_package_domain(cpu, rapl_msr_priv);
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if (!rp)
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return 0;
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cpumask_clear_cpu(cpu, &rp->cpumask);
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lead_cpu = cpumask_first(&rp->cpumask);
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if (lead_cpu >= nr_cpu_ids)
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rapl_remove_package(rp);
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else if (rp->lead_cpu == cpu)
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rp->lead_cpu = lead_cpu;
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return 0;
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}
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static int rapl_msr_read_raw(int cpu, struct reg_action *ra)
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{
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u32 msr = (u32)ra->reg;
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if (rdmsrl_safe_on_cpu(cpu, msr, &ra->value)) {
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pr_debug("failed to read msr 0x%x on cpu %d\n", msr, cpu);
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return -EIO;
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}
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ra->value &= ra->mask;
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return 0;
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}
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static void rapl_msr_update_func(void *info)
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{
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struct reg_action *ra = info;
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u32 msr = (u32)ra->reg;
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u64 val;
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ra->err = rdmsrl_safe(msr, &val);
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if (ra->err)
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return;
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val &= ~ra->mask;
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val |= ra->value;
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ra->err = wrmsrl_safe(msr, val);
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}
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static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
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{
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int ret;
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ret = smp_call_function_single(cpu, rapl_msr_update_func, ra, 1);
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if (WARN_ON_ONCE(ret))
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return ret;
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return ra->err;
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}
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/* List of verified CPUs. */
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static const struct x86_cpu_id pl4_support_ids[] = {
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_TIGERLAKE_L, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE_L, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE_N, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_RAPTORLAKE, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_RAPTORLAKE_P, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_METEORLAKE, X86_FEATURE_ANY },
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_METEORLAKE_L, X86_FEATURE_ANY },
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{}
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};
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static int rapl_msr_probe(struct platform_device *pdev)
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{
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const struct x86_cpu_id *id = x86_match_cpu(pl4_support_ids);
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int ret;
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switch (boot_cpu_data.x86_vendor) {
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case X86_VENDOR_INTEL:
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rapl_msr_priv = &rapl_msr_priv_intel;
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break;
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case X86_VENDOR_HYGON:
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case X86_VENDOR_AMD:
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rapl_msr_priv = &rapl_msr_priv_amd;
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break;
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default:
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pr_err("intel-rapl does not support CPU vendor %d\n", boot_cpu_data.x86_vendor);
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return -ENODEV;
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}
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rapl_msr_priv->read_raw = rapl_msr_read_raw;
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rapl_msr_priv->write_raw = rapl_msr_write_raw;
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if (id) {
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rapl_msr_priv->limits[RAPL_DOMAIN_PACKAGE] = 3;
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rapl_msr_priv->regs[RAPL_DOMAIN_PACKAGE][RAPL_DOMAIN_REG_PL4] =
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MSR_VR_CURRENT_CONFIG;
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pr_info("PL4 support detected.\n");
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}
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rapl_msr_priv->control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
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if (IS_ERR(rapl_msr_priv->control_type)) {
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pr_debug("failed to register powercap control_type.\n");
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return PTR_ERR(rapl_msr_priv->control_type);
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}
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
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rapl_cpu_online, rapl_cpu_down_prep);
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if (ret < 0)
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goto out;
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rapl_msr_priv->pcap_rapl_online = ret;
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return 0;
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out:
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if (ret)
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powercap_unregister_control_type(rapl_msr_priv->control_type);
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return ret;
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}
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static int rapl_msr_remove(struct platform_device *pdev)
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{
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cpuhp_remove_state(rapl_msr_priv->pcap_rapl_online);
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powercap_unregister_control_type(rapl_msr_priv->control_type);
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return 0;
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}
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static const struct platform_device_id rapl_msr_ids[] = {
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{ .name = "intel_rapl_msr", },
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{}
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};
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MODULE_DEVICE_TABLE(platform, rapl_msr_ids);
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static struct platform_driver intel_rapl_msr_driver = {
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.probe = rapl_msr_probe,
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.remove = rapl_msr_remove,
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.id_table = rapl_msr_ids,
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.driver = {
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.name = "intel_rapl_msr",
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},
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};
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module_platform_driver(intel_rapl_msr_driver);
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MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit) control via MSR interface");
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MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
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MODULE_LICENSE("GPL v2");
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