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x86, cpufreq: Add APERF/MPERF support for AMD processors
Starting with model 10 of Family 0x10, AMD processors may have support for APERF/MPERF. Add support for identifying it and using it within cpufreq. Move the APERF/MPERF functions out of the acpi-cpufreq code and into their own file so they can easily be shared. Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com> LKML-Reference: <20100401141956.GA1930@aftab> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Reviewed-by: Thomas Renninger <trenn@suse.de> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Mark Langsdorf
H. Peter Anvin
parent
d65ad45cd8
commit
a2fed573f0
@ -2,8 +2,8 @@
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# K8 systems. ACPI is preferred to all other hardware-specific drivers.
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# speedstep-* is preferred over p4-clockmod.
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obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o
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obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o
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obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o mperf.o
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obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o mperf.o
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obj-$(CONFIG_X86_PCC_CPUFREQ) += pcc-cpufreq.o
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obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o
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obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o
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@ -45,6 +45,7 @@
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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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#include "mperf.h"
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#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
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"acpi-cpufreq", msg)
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@ -70,8 +71,6 @@ struct acpi_cpufreq_data {
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static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
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static DEFINE_PER_CPU(struct aperfmperf, acfreq_old_perf);
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/* acpi_perf_data is a pointer to percpu data. */
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static struct acpi_processor_performance *acpi_perf_data;
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@ -239,45 +238,6 @@ static u32 get_cur_val(const struct cpumask *mask)
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return cmd.val;
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}
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/* Called via smp_call_function_single(), on the target CPU */
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static void read_measured_perf_ctrs(void *_cur)
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{
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struct aperfmperf *am = _cur;
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get_aperfmperf(am);
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}
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/*
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* Return the measured active (C0) frequency on this CPU since last call
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* to this function.
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* Input: cpu number
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* Return: Average CPU frequency in terms of max frequency (zero on error)
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*
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* We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
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* over a period of time, while CPU is in C0 state.
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* IA32_MPERF counts at the rate of max advertised frequency
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* IA32_APERF counts at the rate of actual CPU frequency
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* Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
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* no meaning should be associated with absolute values of these MSRs.
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*/
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static unsigned int get_measured_perf(struct cpufreq_policy *policy,
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unsigned int cpu)
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{
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struct aperfmperf perf;
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unsigned long ratio;
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unsigned int retval;
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if (smp_call_function_single(cpu, read_measured_perf_ctrs, &perf, 1))
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return 0;
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ratio = calc_aperfmperf_ratio(&per_cpu(acfreq_old_perf, cpu), &perf);
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per_cpu(acfreq_old_perf, cpu) = perf;
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retval = (policy->cpuinfo.max_freq * ratio) >> APERFMPERF_SHIFT;
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return retval;
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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 = per_cpu(acfreq_data, cpu);
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@ -701,7 +661,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
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/* Check for APERF/MPERF support in hardware */
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if (cpu_has(c, X86_FEATURE_APERFMPERF))
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acpi_cpufreq_driver.getavg = get_measured_perf;
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acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
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dprintk("CPU%u - ACPI performance management activated.\n", cpu);
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for (i = 0; i < perf->state_count; i++)
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51
arch/x86/kernel/cpu/cpufreq/mperf.c
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51
arch/x86/kernel/cpu/cpufreq/mperf.c
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@ -0,0 +1,51 @@
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/slab.h>
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#include "mperf.h"
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static DEFINE_PER_CPU(struct aperfmperf, acfreq_old_perf);
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/* Called via smp_call_function_single(), on the target CPU */
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static void read_measured_perf_ctrs(void *_cur)
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{
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struct aperfmperf *am = _cur;
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get_aperfmperf(am);
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}
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/*
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* Return the measured active (C0) frequency on this CPU since last call
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* to this function.
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* Input: cpu number
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* Return: Average CPU frequency in terms of max frequency (zero on error)
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*
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* We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
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* over a period of time, while CPU is in C0 state.
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* IA32_MPERF counts at the rate of max advertised frequency
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* IA32_APERF counts at the rate of actual CPU frequency
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* Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
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* no meaning should be associated with absolute values of these MSRs.
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*/
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unsigned int cpufreq_get_measured_perf(struct cpufreq_policy *policy,
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unsigned int cpu)
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{
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struct aperfmperf perf;
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unsigned long ratio;
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unsigned int retval;
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if (smp_call_function_single(cpu, read_measured_perf_ctrs, &perf, 1))
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return 0;
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ratio = calc_aperfmperf_ratio(&per_cpu(acfreq_old_perf, cpu), &perf);
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per_cpu(acfreq_old_perf, cpu) = perf;
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retval = (policy->cpuinfo.max_freq * ratio) >> APERFMPERF_SHIFT;
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return retval;
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}
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EXPORT_SYMBOL_GPL(cpufreq_get_measured_perf);
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MODULE_LICENSE("GPL");
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9
arch/x86/kernel/cpu/cpufreq/mperf.h
Normal file
9
arch/x86/kernel/cpu/cpufreq/mperf.h
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@ -0,0 +1,9 @@
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/*
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* (c) 2010 Advanced Micro Devices, Inc.
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* Your use of this code is subject to the terms and conditions of the
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*/
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unsigned int cpufreq_get_measured_perf(struct cpufreq_policy *policy,
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unsigned int cpu);
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@ -45,6 +45,7 @@
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#define PFX "powernow-k8: "
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#define VERSION "version 2.20.00"
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#include "powernow-k8.h"
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#include "mperf.h"
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/* serialize freq changes */
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static DEFINE_MUTEX(fidvid_mutex);
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@ -57,6 +58,8 @@ static int cpu_family = CPU_OPTERON;
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static bool cpb_capable, cpb_enabled;
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static struct msr __percpu *msrs;
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static struct cpufreq_driver cpufreq_amd64_driver;
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#ifndef CONFIG_SMP
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static inline const struct cpumask *cpu_core_mask(int cpu)
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{
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@ -1251,6 +1254,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
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struct powernow_k8_data *data;
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struct init_on_cpu init_on_cpu;
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int rc;
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struct cpuinfo_x86 *c = &cpu_data(pol->cpu);
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if (!cpu_online(pol->cpu))
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return -ENODEV;
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@ -1325,6 +1329,10 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
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return -EINVAL;
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}
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/* Check for APERF/MPERF support in hardware */
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if (cpu_has(c, X86_FEATURE_APERFMPERF))
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cpufreq_amd64_driver.getavg = cpufreq_get_measured_perf;
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cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
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if (cpu_family == CPU_HW_PSTATE)
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