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drivers/powercap/intel_rapl_msr.c
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// SPDX-License-Identifier: GPL-2.0-only /* * Intel Running Average Power Limit (RAPL) Driver via MSR interface * Copyright (c) 2019, Intel Corporation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/list.h> #include <linux/types.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/log2.h> #include <linux/bitmap.h> #include <linux/delay.h> #include <linux/sysfs.h> #include <linux/cpu.h> #include <linux/powercap.h> #include <linux/suspend.h> #include <linux/intel_rapl.h> #include <linux/processor.h> |
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#include <linux/platform_device.h> |
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#include <asm/iosf_mbi.h> #include <asm/cpu_device_id.h> #include <asm/intel-family.h> /* Local defines */ #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 */ static struct rapl_if_priv rapl_msr_priv = { .reg_unit = MSR_RAPL_POWER_UNIT, .regs[RAPL_DOMAIN_PACKAGE] = { MSR_PKG_POWER_LIMIT, MSR_PKG_ENERGY_STATUS, MSR_PKG_PERF_STATUS, 0, MSR_PKG_POWER_INFO }, .regs[RAPL_DOMAIN_PP0] = { MSR_PP0_POWER_LIMIT, MSR_PP0_ENERGY_STATUS, 0, MSR_PP0_POLICY, 0 }, .regs[RAPL_DOMAIN_PP1] = { MSR_PP1_POWER_LIMIT, MSR_PP1_ENERGY_STATUS, 0, MSR_PP1_POLICY, 0 }, .regs[RAPL_DOMAIN_DRAM] = { MSR_DRAM_POWER_LIMIT, MSR_DRAM_ENERGY_STATUS, MSR_DRAM_PERF_STATUS, 0, MSR_DRAM_POWER_INFO }, .regs[RAPL_DOMAIN_PLATFORM] = { 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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}; /* Handles CPU hotplug on multi-socket systems. * If a CPU goes online as the first CPU of the physical package * we add the RAPL package to the system. Similarly, when the last * CPU of the package is removed, we remove the RAPL package and its * associated domains. Cooling devices are handled accordingly at * per-domain level. */ static int rapl_cpu_online(unsigned int cpu) { struct rapl_package *rp; rp = rapl_find_package_domain(cpu, &rapl_msr_priv); if (!rp) { rp = rapl_add_package(cpu, &rapl_msr_priv); if (IS_ERR(rp)) return PTR_ERR(rp); } cpumask_set_cpu(cpu, &rp->cpumask); return 0; } static int rapl_cpu_down_prep(unsigned int cpu) { struct rapl_package *rp; int lead_cpu; rp = rapl_find_package_domain(cpu, &rapl_msr_priv); if (!rp) return 0; cpumask_clear_cpu(cpu, &rp->cpumask); lead_cpu = cpumask_first(&rp->cpumask); if (lead_cpu >= nr_cpu_ids) rapl_remove_package(rp); else if (rp->lead_cpu == cpu) rp->lead_cpu = lead_cpu; return 0; } static int rapl_msr_read_raw(int cpu, struct reg_action *ra) { |
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u32 msr = (u32)ra->reg; if (rdmsrl_safe_on_cpu(cpu, msr, &ra->value)) { pr_debug("failed to read msr 0x%x on cpu %d ", msr, cpu); |
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return -EIO; } ra->value &= ra->mask; return 0; } static void rapl_msr_update_func(void *info) { 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) return; val &= ~ra->mask; val |= ra->value; |
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ra->err = wrmsrl_safe(msr, val); |
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} static int rapl_msr_write_raw(int cpu, struct reg_action *ra) { int ret; ret = smp_call_function_single(cpu, rapl_msr_update_func, ra, 1); if (WARN_ON_ONCE(ret)) return ret; return ra->err; } |
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/* List of verified CPUs. */ static const struct x86_cpu_id pl4_support_ids[] = { { X86_VENDOR_INTEL, 6, INTEL_FAM6_TIGERLAKE_L, X86_FEATURE_ANY }, {} }; |
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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; rapl_msr_priv.read_raw = rapl_msr_read_raw; rapl_msr_priv.write_raw = rapl_msr_write_raw; |
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if (id) { rapl_msr_priv.limits[RAPL_DOMAIN_PACKAGE] = 3; rapl_msr_priv.regs[RAPL_DOMAIN_PACKAGE][RAPL_DOMAIN_REG_PL4] = MSR_VR_CURRENT_CONFIG; pr_info("PL4 support detected. "); } |
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rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL); if (IS_ERR(rapl_msr_priv.control_type)) { pr_debug("failed to register powercap control_type. "); return PTR_ERR(rapl_msr_priv.control_type); } ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online", rapl_cpu_online, rapl_cpu_down_prep); if (ret < 0) goto out; rapl_msr_priv.pcap_rapl_online = ret; |
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return 0; out: if (ret) powercap_unregister_control_type(rapl_msr_priv.control_type); return ret; } |
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static int rapl_msr_remove(struct platform_device *pdev) |
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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[] = { { .name = "intel_rapl_msr", }, {} }; MODULE_DEVICE_TABLE(platform, rapl_msr_ids); static struct platform_driver intel_rapl_msr_driver = { .probe = rapl_msr_probe, .remove = rapl_msr_remove, .id_table = rapl_msr_ids, .driver = { .name = "intel_rapl_msr", }, }; 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"); MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>"); MODULE_LICENSE("GPL v2"); |