forked from Minki/linux
1a186d9e11
The cpufreq core is already validating the CPU frequency table after calling the ->init() callback of the cpufreq drivers and the drivers don't need to do the same anymore. Though they need to set the policy->freq_table field directly from the ->init() callback now. Stop validating the frequency table in the acpi-cpufreq driver. The driver needs to crosscheck if the max frequency corresponds to the P-state 0 or not and the same is done from the ->ready() callback now. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1019 lines
25 KiB
C
1019 lines
25 KiB
C
/*
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* acpi-cpufreq.c - ACPI Processor P-States Driver
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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/init.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/cpufreq.h>
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#include <linux/compiler.h>
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <acpi/processor.h>
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#include <asm/msr.h>
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#include <asm/processor.h>
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#include <asm/cpufeature.h>
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MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
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MODULE_DESCRIPTION("ACPI Processor P-States Driver");
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MODULE_LICENSE("GPL");
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enum {
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UNDEFINED_CAPABLE = 0,
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SYSTEM_INTEL_MSR_CAPABLE,
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SYSTEM_AMD_MSR_CAPABLE,
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SYSTEM_IO_CAPABLE,
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};
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#define INTEL_MSR_RANGE (0xffff)
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#define AMD_MSR_RANGE (0x7)
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#define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
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struct acpi_cpufreq_data {
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unsigned int resume;
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unsigned int cpu_feature;
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unsigned int acpi_perf_cpu;
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cpumask_var_t freqdomain_cpus;
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void (*cpu_freq_write)(struct acpi_pct_register *reg, u32 val);
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u32 (*cpu_freq_read)(struct acpi_pct_register *reg);
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};
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/* acpi_perf_data is a pointer to percpu data. */
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static struct acpi_processor_performance __percpu *acpi_perf_data;
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static inline struct acpi_processor_performance *to_perf_data(struct acpi_cpufreq_data *data)
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{
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return per_cpu_ptr(acpi_perf_data, data->acpi_perf_cpu);
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}
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static struct cpufreq_driver acpi_cpufreq_driver;
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static unsigned int acpi_pstate_strict;
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static bool boost_state(unsigned int cpu)
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{
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u32 lo, hi;
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u64 msr;
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switch (boot_cpu_data.x86_vendor) {
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case X86_VENDOR_INTEL:
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rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
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msr = lo | ((u64)hi << 32);
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return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
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case X86_VENDOR_AMD:
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rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
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msr = lo | ((u64)hi << 32);
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return !(msr & MSR_K7_HWCR_CPB_DIS);
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}
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return false;
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}
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static int boost_set_msr(bool enable)
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{
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u32 msr_addr;
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u64 msr_mask, val;
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switch (boot_cpu_data.x86_vendor) {
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case X86_VENDOR_INTEL:
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msr_addr = MSR_IA32_MISC_ENABLE;
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msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
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break;
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case X86_VENDOR_AMD:
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msr_addr = MSR_K7_HWCR;
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msr_mask = MSR_K7_HWCR_CPB_DIS;
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break;
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default:
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return -EINVAL;
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}
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rdmsrl(msr_addr, val);
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if (enable)
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val &= ~msr_mask;
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else
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val |= msr_mask;
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wrmsrl(msr_addr, val);
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return 0;
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}
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static void boost_set_msr_each(void *p_en)
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{
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bool enable = (bool) p_en;
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boost_set_msr(enable);
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}
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static int set_boost(int val)
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{
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get_online_cpus();
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on_each_cpu(boost_set_msr_each, (void *)(long)val, 1);
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put_online_cpus();
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pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
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return 0;
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}
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static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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if (unlikely(!data))
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return -ENODEV;
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return cpufreq_show_cpus(data->freqdomain_cpus, buf);
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}
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cpufreq_freq_attr_ro(freqdomain_cpus);
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#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
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static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
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size_t count)
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{
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int ret;
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unsigned int val = 0;
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if (!acpi_cpufreq_driver.set_boost)
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return -EINVAL;
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ret = kstrtouint(buf, 10, &val);
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if (ret || val > 1)
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return -EINVAL;
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set_boost(val);
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return count;
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}
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static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
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{
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return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled);
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}
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cpufreq_freq_attr_rw(cpb);
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#endif
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static int check_est_cpu(unsigned int cpuid)
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{
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struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
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return cpu_has(cpu, X86_FEATURE_EST);
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}
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static int check_amd_hwpstate_cpu(unsigned int cpuid)
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{
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struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
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return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
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}
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static unsigned extract_io(struct cpufreq_policy *policy, u32 value)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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struct acpi_processor_performance *perf;
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int i;
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perf = to_perf_data(data);
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for (i = 0; i < perf->state_count; i++) {
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if (value == perf->states[i].status)
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return policy->freq_table[i].frequency;
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}
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return 0;
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}
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static unsigned extract_msr(struct cpufreq_policy *policy, u32 msr)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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struct cpufreq_frequency_table *pos;
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struct acpi_processor_performance *perf;
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if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
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msr &= AMD_MSR_RANGE;
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else
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msr &= INTEL_MSR_RANGE;
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perf = to_perf_data(data);
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cpufreq_for_each_entry(pos, policy->freq_table)
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if (msr == perf->states[pos->driver_data].status)
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return pos->frequency;
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return policy->freq_table[0].frequency;
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}
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static unsigned extract_freq(struct cpufreq_policy *policy, u32 val)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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switch (data->cpu_feature) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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case SYSTEM_AMD_MSR_CAPABLE:
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return extract_msr(policy, val);
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case SYSTEM_IO_CAPABLE:
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return extract_io(policy, val);
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default:
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return 0;
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}
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}
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static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used)
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{
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u32 val, dummy;
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rdmsr(MSR_IA32_PERF_CTL, val, dummy);
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return val;
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}
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static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val)
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{
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u32 lo, hi;
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rdmsr(MSR_IA32_PERF_CTL, lo, hi);
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lo = (lo & ~INTEL_MSR_RANGE) | (val & INTEL_MSR_RANGE);
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wrmsr(MSR_IA32_PERF_CTL, lo, hi);
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}
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static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used)
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{
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u32 val, dummy;
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rdmsr(MSR_AMD_PERF_CTL, val, dummy);
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return val;
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}
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static void cpu_freq_write_amd(struct acpi_pct_register *not_used, u32 val)
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{
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wrmsr(MSR_AMD_PERF_CTL, val, 0);
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}
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static u32 cpu_freq_read_io(struct acpi_pct_register *reg)
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{
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u32 val;
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acpi_os_read_port(reg->address, &val, reg->bit_width);
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return val;
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}
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static void cpu_freq_write_io(struct acpi_pct_register *reg, u32 val)
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{
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acpi_os_write_port(reg->address, val, reg->bit_width);
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}
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struct drv_cmd {
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struct acpi_pct_register *reg;
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u32 val;
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union {
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void (*write)(struct acpi_pct_register *reg, u32 val);
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u32 (*read)(struct acpi_pct_register *reg);
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} func;
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};
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/* Called via smp_call_function_single(), on the target CPU */
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static void do_drv_read(void *_cmd)
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{
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struct drv_cmd *cmd = _cmd;
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cmd->val = cmd->func.read(cmd->reg);
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}
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static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask)
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{
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struct acpi_processor_performance *perf = to_perf_data(data);
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struct drv_cmd cmd = {
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.reg = &perf->control_register,
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.func.read = data->cpu_freq_read,
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};
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int err;
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err = smp_call_function_any(mask, do_drv_read, &cmd, 1);
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WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
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return cmd.val;
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}
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/* Called via smp_call_function_many(), on the target CPUs */
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static void do_drv_write(void *_cmd)
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{
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struct drv_cmd *cmd = _cmd;
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cmd->func.write(cmd->reg, cmd->val);
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}
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static void drv_write(struct acpi_cpufreq_data *data,
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const struct cpumask *mask, u32 val)
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{
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struct acpi_processor_performance *perf = to_perf_data(data);
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struct drv_cmd cmd = {
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.reg = &perf->control_register,
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.val = val,
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.func.write = data->cpu_freq_write,
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};
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int this_cpu;
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this_cpu = get_cpu();
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if (cpumask_test_cpu(this_cpu, mask))
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do_drv_write(&cmd);
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smp_call_function_many(mask, do_drv_write, &cmd, 1);
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put_cpu();
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}
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static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)
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{
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u32 val;
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if (unlikely(cpumask_empty(mask)))
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return 0;
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val = drv_read(data, mask);
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pr_debug("get_cur_val = %u\n", val);
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return val;
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}
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static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
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{
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struct acpi_cpufreq_data *data;
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struct cpufreq_policy *policy;
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unsigned int freq;
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unsigned int cached_freq;
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pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
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policy = cpufreq_cpu_get_raw(cpu);
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if (unlikely(!policy))
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return 0;
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data = policy->driver_data;
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if (unlikely(!data || !policy->freq_table))
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return 0;
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cached_freq = policy->freq_table[to_perf_data(data)->state].frequency;
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freq = extract_freq(policy, get_cur_val(cpumask_of(cpu), data));
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if (freq != cached_freq) {
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/*
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* The dreaded BIOS frequency change behind our back.
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* Force set the frequency on next target call.
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*/
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data->resume = 1;
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}
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pr_debug("cur freq = %u\n", freq);
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return freq;
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}
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static unsigned int check_freqs(struct cpufreq_policy *policy,
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const struct cpumask *mask, unsigned int freq)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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unsigned int cur_freq;
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unsigned int i;
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for (i = 0; i < 100; i++) {
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cur_freq = extract_freq(policy, get_cur_val(mask, data));
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if (cur_freq == freq)
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return 1;
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udelay(10);
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}
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return 0;
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}
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static int acpi_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int index)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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struct acpi_processor_performance *perf;
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const struct cpumask *mask;
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unsigned int next_perf_state = 0; /* Index into perf table */
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int result = 0;
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if (unlikely(!data)) {
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return -ENODEV;
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}
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perf = to_perf_data(data);
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next_perf_state = policy->freq_table[index].driver_data;
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if (perf->state == next_perf_state) {
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if (unlikely(data->resume)) {
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pr_debug("Called after resume, resetting to P%d\n",
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next_perf_state);
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data->resume = 0;
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} else {
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pr_debug("Already at target state (P%d)\n",
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next_perf_state);
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return 0;
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}
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}
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/*
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* The core won't allow CPUs to go away until the governor has been
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* stopped, so we can rely on the stability of policy->cpus.
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*/
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mask = policy->shared_type == CPUFREQ_SHARED_TYPE_ANY ?
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cpumask_of(policy->cpu) : policy->cpus;
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drv_write(data, mask, perf->states[next_perf_state].control);
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if (acpi_pstate_strict) {
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if (!check_freqs(policy, mask,
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policy->freq_table[index].frequency)) {
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pr_debug("acpi_cpufreq_target failed (%d)\n",
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policy->cpu);
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result = -EAGAIN;
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}
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}
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if (!result)
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perf->state = next_perf_state;
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return result;
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}
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unsigned int acpi_cpufreq_fast_switch(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct acpi_cpufreq_data *data = policy->driver_data;
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struct acpi_processor_performance *perf;
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struct cpufreq_frequency_table *entry;
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unsigned int next_perf_state, next_freq, index;
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/*
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* Find the closest frequency above target_freq.
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*/
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if (policy->cached_target_freq == target_freq)
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index = policy->cached_resolved_idx;
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else
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index = cpufreq_table_find_index_dl(policy, target_freq);
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entry = &policy->freq_table[index];
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next_freq = entry->frequency;
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next_perf_state = entry->driver_data;
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perf = to_perf_data(data);
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if (perf->state == next_perf_state) {
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if (unlikely(data->resume))
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data->resume = 0;
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else
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return next_freq;
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}
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data->cpu_freq_write(&perf->control_register,
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perf->states[next_perf_state].control);
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perf->state = next_perf_state;
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return next_freq;
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}
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static unsigned long
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acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
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{
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struct acpi_processor_performance *perf;
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perf = to_perf_data(data);
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if (cpu_khz) {
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/* search the closest match to cpu_khz */
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unsigned int i;
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unsigned long freq;
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unsigned long freqn = perf->states[0].core_frequency * 1000;
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for (i = 0; i < (perf->state_count-1); i++) {
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freq = freqn;
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freqn = perf->states[i+1].core_frequency * 1000;
|
|
if ((2 * cpu_khz) > (freqn + freq)) {
|
|
perf->state = i;
|
|
return freq;
|
|
}
|
|
}
|
|
perf->state = perf->state_count-1;
|
|
return freqn;
|
|
} else {
|
|
/* assume CPU is at P0... */
|
|
perf->state = 0;
|
|
return perf->states[0].core_frequency * 1000;
|
|
}
|
|
}
|
|
|
|
static void free_acpi_perf_data(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
/* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
|
|
for_each_possible_cpu(i)
|
|
free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
|
|
->shared_cpu_map);
|
|
free_percpu(acpi_perf_data);
|
|
}
|
|
|
|
static int cpufreq_boost_online(unsigned int cpu)
|
|
{
|
|
/*
|
|
* On the CPU_UP path we simply keep the boost-disable flag
|
|
* in sync with the current global state.
|
|
*/
|
|
return boost_set_msr(acpi_cpufreq_driver.boost_enabled);
|
|
}
|
|
|
|
static int cpufreq_boost_down_prep(unsigned int cpu)
|
|
{
|
|
/*
|
|
* Clear the boost-disable bit on the CPU_DOWN path so that
|
|
* this cpu cannot block the remaining ones from boosting.
|
|
*/
|
|
return boost_set_msr(1);
|
|
}
|
|
|
|
/*
|
|
* acpi_cpufreq_early_init - initialize ACPI P-States library
|
|
*
|
|
* Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
|
|
* in order to determine correct frequency and voltage pairings. We can
|
|
* do _PDC and _PSD and find out the processor dependency for the
|
|
* actual init that will happen later...
|
|
*/
|
|
static int __init acpi_cpufreq_early_init(void)
|
|
{
|
|
unsigned int i;
|
|
pr_debug("acpi_cpufreq_early_init\n");
|
|
|
|
acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
|
|
if (!acpi_perf_data) {
|
|
pr_debug("Memory allocation error for acpi_perf_data.\n");
|
|
return -ENOMEM;
|
|
}
|
|
for_each_possible_cpu(i) {
|
|
if (!zalloc_cpumask_var_node(
|
|
&per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
|
|
GFP_KERNEL, cpu_to_node(i))) {
|
|
|
|
/* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
|
|
free_acpi_perf_data();
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
/* Do initialization in ACPI core */
|
|
acpi_processor_preregister_performance(acpi_perf_data);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Some BIOSes do SW_ANY coordination internally, either set it up in hw
|
|
* or do it in BIOS firmware and won't inform about it to OS. If not
|
|
* detected, this has a side effect of making CPU run at a different speed
|
|
* than OS intended it to run at. Detect it and handle it cleanly.
|
|
*/
|
|
static int bios_with_sw_any_bug;
|
|
|
|
static int sw_any_bug_found(const struct dmi_system_id *d)
|
|
{
|
|
bios_with_sw_any_bug = 1;
|
|
return 0;
|
|
}
|
|
|
|
static const struct dmi_system_id sw_any_bug_dmi_table[] = {
|
|
{
|
|
.callback = sw_any_bug_found,
|
|
.ident = "Supermicro Server X6DLP",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "080010"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
|
|
{
|
|
/* Intel Xeon Processor 7100 Series Specification Update
|
|
* http://www.intel.com/Assets/PDF/specupdate/314554.pdf
|
|
* AL30: A Machine Check Exception (MCE) Occurring during an
|
|
* Enhanced Intel SpeedStep Technology Ratio Change May Cause
|
|
* Both Processor Cores to Lock Up. */
|
|
if (c->x86_vendor == X86_VENDOR_INTEL) {
|
|
if ((c->x86 == 15) &&
|
|
(c->x86_model == 6) &&
|
|
(c->x86_stepping == 8)) {
|
|
pr_info("Intel(R) Xeon(R) 7100 Errata AL30, processors may lock up on frequency changes: disabling acpi-cpufreq\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
unsigned int i;
|
|
unsigned int valid_states = 0;
|
|
unsigned int cpu = policy->cpu;
|
|
struct acpi_cpufreq_data *data;
|
|
unsigned int result = 0;
|
|
struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
|
|
struct acpi_processor_performance *perf;
|
|
struct cpufreq_frequency_table *freq_table;
|
|
#ifdef CONFIG_SMP
|
|
static int blacklisted;
|
|
#endif
|
|
|
|
pr_debug("acpi_cpufreq_cpu_init\n");
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (blacklisted)
|
|
return blacklisted;
|
|
blacklisted = acpi_cpufreq_blacklist(c);
|
|
if (blacklisted)
|
|
return blacklisted;
|
|
#endif
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
|
|
result = -ENOMEM;
|
|
goto err_free;
|
|
}
|
|
|
|
perf = per_cpu_ptr(acpi_perf_data, cpu);
|
|
data->acpi_perf_cpu = cpu;
|
|
policy->driver_data = data;
|
|
|
|
if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
|
|
acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
|
|
|
|
result = acpi_processor_register_performance(perf, cpu);
|
|
if (result)
|
|
goto err_free_mask;
|
|
|
|
policy->shared_type = perf->shared_type;
|
|
|
|
/*
|
|
* Will let policy->cpus know about dependency only when software
|
|
* coordination is required.
|
|
*/
|
|
if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
|
|
policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
|
|
cpumask_copy(policy->cpus, perf->shared_cpu_map);
|
|
}
|
|
cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
|
|
|
|
#ifdef CONFIG_SMP
|
|
dmi_check_system(sw_any_bug_dmi_table);
|
|
if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
|
|
policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
|
|
cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
|
|
}
|
|
|
|
if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
|
|
cpumask_clear(policy->cpus);
|
|
cpumask_set_cpu(cpu, policy->cpus);
|
|
cpumask_copy(data->freqdomain_cpus,
|
|
topology_sibling_cpumask(cpu));
|
|
policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
|
|
pr_info_once("overriding BIOS provided _PSD data\n");
|
|
}
|
|
#endif
|
|
|
|
/* capability check */
|
|
if (perf->state_count <= 1) {
|
|
pr_debug("No P-States\n");
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
if (perf->control_register.space_id != perf->status_register.space_id) {
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
switch (perf->control_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
|
|
boot_cpu_data.x86 == 0xf) {
|
|
pr_debug("AMD K8 systems must use native drivers.\n");
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
pr_debug("SYSTEM IO addr space\n");
|
|
data->cpu_feature = SYSTEM_IO_CAPABLE;
|
|
data->cpu_freq_read = cpu_freq_read_io;
|
|
data->cpu_freq_write = cpu_freq_write_io;
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
pr_debug("HARDWARE addr space\n");
|
|
if (check_est_cpu(cpu)) {
|
|
data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
|
|
data->cpu_freq_read = cpu_freq_read_intel;
|
|
data->cpu_freq_write = cpu_freq_write_intel;
|
|
break;
|
|
}
|
|
if (check_amd_hwpstate_cpu(cpu)) {
|
|
data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
|
|
data->cpu_freq_read = cpu_freq_read_amd;
|
|
data->cpu_freq_write = cpu_freq_write_amd;
|
|
break;
|
|
}
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
default:
|
|
pr_debug("Unknown addr space %d\n",
|
|
(u32) (perf->control_register.space_id));
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
freq_table = kzalloc(sizeof(*freq_table) *
|
|
(perf->state_count+1), GFP_KERNEL);
|
|
if (!freq_table) {
|
|
result = -ENOMEM;
|
|
goto err_unreg;
|
|
}
|
|
|
|
/* detect transition latency */
|
|
policy->cpuinfo.transition_latency = 0;
|
|
for (i = 0; i < perf->state_count; i++) {
|
|
if ((perf->states[i].transition_latency * 1000) >
|
|
policy->cpuinfo.transition_latency)
|
|
policy->cpuinfo.transition_latency =
|
|
perf->states[i].transition_latency * 1000;
|
|
}
|
|
|
|
/* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
|
|
if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
|
|
policy->cpuinfo.transition_latency > 20 * 1000) {
|
|
policy->cpuinfo.transition_latency = 20 * 1000;
|
|
pr_info_once("P-state transition latency capped at 20 uS\n");
|
|
}
|
|
|
|
/* table init */
|
|
for (i = 0; i < perf->state_count; i++) {
|
|
if (i > 0 && perf->states[i].core_frequency >=
|
|
freq_table[valid_states-1].frequency / 1000)
|
|
continue;
|
|
|
|
freq_table[valid_states].driver_data = i;
|
|
freq_table[valid_states].frequency =
|
|
perf->states[i].core_frequency * 1000;
|
|
valid_states++;
|
|
}
|
|
freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
|
|
policy->freq_table = freq_table;
|
|
perf->state = 0;
|
|
|
|
switch (perf->control_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
/*
|
|
* The core will not set policy->cur, because
|
|
* cpufreq_driver->get is NULL, so we need to set it here.
|
|
* However, we have to guess it, because the current speed is
|
|
* unknown and not detectable via IO ports.
|
|
*/
|
|
policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* notify BIOS that we exist */
|
|
acpi_processor_notify_smm(THIS_MODULE);
|
|
|
|
pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
|
|
for (i = 0; i < perf->state_count; i++)
|
|
pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
|
|
(i == perf->state ? '*' : ' '), i,
|
|
(u32) perf->states[i].core_frequency,
|
|
(u32) perf->states[i].power,
|
|
(u32) perf->states[i].transition_latency);
|
|
|
|
/*
|
|
* the first call to ->target() should result in us actually
|
|
* writing something to the appropriate registers.
|
|
*/
|
|
data->resume = 1;
|
|
|
|
policy->fast_switch_possible = !acpi_pstate_strict &&
|
|
!(policy_is_shared(policy) && policy->shared_type != CPUFREQ_SHARED_TYPE_ANY);
|
|
|
|
return result;
|
|
|
|
err_unreg:
|
|
acpi_processor_unregister_performance(cpu);
|
|
err_free_mask:
|
|
free_cpumask_var(data->freqdomain_cpus);
|
|
err_free:
|
|
kfree(data);
|
|
policy->driver_data = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
struct acpi_cpufreq_data *data = policy->driver_data;
|
|
|
|
pr_debug("acpi_cpufreq_cpu_exit\n");
|
|
|
|
policy->fast_switch_possible = false;
|
|
policy->driver_data = NULL;
|
|
acpi_processor_unregister_performance(data->acpi_perf_cpu);
|
|
free_cpumask_var(data->freqdomain_cpus);
|
|
kfree(policy->freq_table);
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_cpufreq_cpu_ready(struct cpufreq_policy *policy)
|
|
{
|
|
struct acpi_processor_performance *perf = per_cpu_ptr(acpi_perf_data,
|
|
policy->cpu);
|
|
|
|
if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
|
|
pr_warn(FW_WARN "P-state 0 is not max freq\n");
|
|
}
|
|
|
|
static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
|
|
{
|
|
struct acpi_cpufreq_data *data = policy->driver_data;
|
|
|
|
pr_debug("acpi_cpufreq_resume\n");
|
|
|
|
data->resume = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct freq_attr *acpi_cpufreq_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
&freqdomain_cpus,
|
|
#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
|
|
&cpb,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static struct cpufreq_driver acpi_cpufreq_driver = {
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = acpi_cpufreq_target,
|
|
.fast_switch = acpi_cpufreq_fast_switch,
|
|
.bios_limit = acpi_processor_get_bios_limit,
|
|
.init = acpi_cpufreq_cpu_init,
|
|
.exit = acpi_cpufreq_cpu_exit,
|
|
.ready = acpi_cpufreq_cpu_ready,
|
|
.resume = acpi_cpufreq_resume,
|
|
.name = "acpi-cpufreq",
|
|
.attr = acpi_cpufreq_attr,
|
|
};
|
|
|
|
static enum cpuhp_state acpi_cpufreq_online;
|
|
|
|
static void __init acpi_cpufreq_boost_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)))
|
|
return;
|
|
|
|
acpi_cpufreq_driver.set_boost = set_boost;
|
|
acpi_cpufreq_driver.boost_enabled = boost_state(0);
|
|
|
|
/*
|
|
* This calls the online callback on all online cpu and forces all
|
|
* MSRs to the same value.
|
|
*/
|
|
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "cpufreq/acpi:online",
|
|
cpufreq_boost_online, cpufreq_boost_down_prep);
|
|
if (ret < 0) {
|
|
pr_err("acpi_cpufreq: failed to register hotplug callbacks\n");
|
|
return;
|
|
}
|
|
acpi_cpufreq_online = ret;
|
|
}
|
|
|
|
static void acpi_cpufreq_boost_exit(void)
|
|
{
|
|
if (acpi_cpufreq_online > 0)
|
|
cpuhp_remove_state_nocalls(acpi_cpufreq_online);
|
|
}
|
|
|
|
static int __init acpi_cpufreq_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
/* don't keep reloading if cpufreq_driver exists */
|
|
if (cpufreq_get_current_driver())
|
|
return -EEXIST;
|
|
|
|
pr_debug("acpi_cpufreq_init\n");
|
|
|
|
ret = acpi_cpufreq_early_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
|
|
/* this is a sysfs file with a strange name and an even stranger
|
|
* semantic - per CPU instantiation, but system global effect.
|
|
* Lets enable it only on AMD CPUs for compatibility reasons and
|
|
* only if configured. This is considered legacy code, which
|
|
* will probably be removed at some point in the future.
|
|
*/
|
|
if (!check_amd_hwpstate_cpu(0)) {
|
|
struct freq_attr **attr;
|
|
|
|
pr_debug("CPB unsupported, do not expose it\n");
|
|
|
|
for (attr = acpi_cpufreq_attr; *attr; attr++)
|
|
if (*attr == &cpb) {
|
|
*attr = NULL;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
acpi_cpufreq_boost_init();
|
|
|
|
ret = cpufreq_register_driver(&acpi_cpufreq_driver);
|
|
if (ret) {
|
|
free_acpi_perf_data();
|
|
acpi_cpufreq_boost_exit();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void __exit acpi_cpufreq_exit(void)
|
|
{
|
|
pr_debug("acpi_cpufreq_exit\n");
|
|
|
|
acpi_cpufreq_boost_exit();
|
|
|
|
cpufreq_unregister_driver(&acpi_cpufreq_driver);
|
|
|
|
free_acpi_perf_data();
|
|
}
|
|
|
|
module_param(acpi_pstate_strict, uint, 0644);
|
|
MODULE_PARM_DESC(acpi_pstate_strict,
|
|
"value 0 or non-zero. non-zero -> strict ACPI checks are "
|
|
"performed during frequency changes.");
|
|
|
|
late_initcall(acpi_cpufreq_init);
|
|
module_exit(acpi_cpufreq_exit);
|
|
|
|
static const struct x86_cpu_id acpi_cpufreq_ids[] = {
|
|
X86_FEATURE_MATCH(X86_FEATURE_ACPI),
|
|
X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
|
|
|
|
static const struct acpi_device_id processor_device_ids[] = {
|
|
{ACPI_PROCESSOR_OBJECT_HID, },
|
|
{ACPI_PROCESSOR_DEVICE_HID, },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, processor_device_ids);
|
|
|
|
MODULE_ALIAS("acpi");
|