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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-ia64-devel] [PATCH 1/3] IA64: add cpufreq support
On Sat, Sep 27, 2008 at 10:12:03AM +0800, Yu, Ke wrote:
> IA64: Add cpufreq ia64 driver
>
> For IA64 Platform, add cpufreq driver for ia64 cpu, implementing
> cpufreq_driver->init()/ exit()/ verify()/ target()/ get()
>
> Signed-off-by: Yu, Ke <ke.yu@xxxxxxxxx>
> Liu, Jinsong <jinsong.liu@xxxxxxxxx>
Hi.
About indentation.
Xen/IA64 have done very badly about indent style.
Some files are Linux style, others xen style.
I think cpufreq.c is drived from linux so Linux style would be better.
Please make it Linux style instead of 4 tab.
About xen/include/acpi/cpufreq/cpufreq.h:
Since it is the common file which is shared by x86 and ia64.
So split out this hunk and send to xen-devel.
thanks,
> IA64: Add cpufreq ia64 driver
>
> For IA64 Platform, add cpufreq driver for ia64 cpu, implementing
> cpufreq_driver->init()/ exit()/ verify()/ target()/ get()
>
> Signed-off-by: Yu, Ke <ke.yu@xxxxxxxxx>
> Liu, Jinsong <jinsong.liu@xxxxxxxxx>
>
> diff -r 2aaf950e6f50 xen/arch/ia64/xen/Makefile
> --- a/xen/arch/ia64/xen/Makefile Fri Sep 26 15:21:26 2008 +0800
> +++ b/xen/arch/ia64/xen/Makefile Fri Sep 26 15:37:39 2008 +0800
> @@ -1,4 +1,5 @@
> subdir-y += oprofile
> +subdir-y += cpufreq
>
> obj-y += relocate_kernel.o
> obj-y += machine_kexec.o
> diff -r 2aaf950e6f50 xen/arch/ia64/xen/cpufreq/Makefile
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/xen/arch/ia64/xen/cpufreq/Makefile Fri Sep 26 15:37:39 2008 +0800
> @@ -0,0 +1,1 @@
> +obj-y += cpufreq.o
> diff -r 2aaf950e6f50 xen/arch/ia64/xen/cpufreq/cpufreq.c
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/xen/arch/ia64/xen/cpufreq/cpufreq.c Fri Sep 26 15:37:39 2008 +0800
> @@ -0,0 +1,303 @@
> +/*
> + * arch/ia64/kernel/cpufreq/acpi-cpufreq.c
> + * This file provides the ACPI based P-state support. This
> + * module works with generic cpufreq infrastructure. Most of
> + * the code is based on i386 version
> + * (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
> + *
> + * Copyright (C) 2005 Intel Corp
> + * Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
> + *
> + * Sep 2008 - Liu Jinsong <jinsong.liu@xxxxxxxxx>
> + * porting IPF acpi-cpufreq.c from Linux 2.6.23 to Xen hypervisor
> + */
> +
> +#include <xen/types.h>
> +#include <xen/errno.h>
> +#include <xen/delay.h>
> +#include <xen/cpumask.h>
> +#include <xen/sched.h>
> +#include <xen/timer.h>
> +#include <xen/xmalloc.h>
> +#include <asm/bug.h>
> +#include <asm/io.h>
> +#include <asm/config.h>
> +#include <asm/processor.h>
> +#include <asm/percpu.h>
> +#include <asm/pal.h>
> +#include <acpi/acpi.h>
> +#include <acpi/cpufreq/cpufreq.h>
> +
> +static struct acpi_cpufreq_data *drv_data[NR_CPUS];
> +
> +static struct cpufreq_driver acpi_cpufreq_driver;
> +
> +static int
> +processor_get_pstate (u32 *value)
> +{
> + u64 pstate_index = 0;
> + s64 retval;
> +
> + retval = ia64_pal_get_pstate(&pstate_index,
> + PAL_GET_PSTATE_TYPE_INSTANT);
> + *value = (u32) pstate_index;
> +
> + if (retval)
> + printk("Failed to get current freq\n");
> +
> + return (int)retval;
> +}
> +
> +static unsigned int
> +extract_clock (unsigned value)
> +{
> + unsigned long i;
> + unsigned int cpu;
> + struct processor_performance *perf;
> +
> + cpu = smp_processor_id();
> + perf = &processor_pminfo[cpu]->perf;
> +
> + for (i = 0; i < perf->state_count; i++) {
> + if (value == perf->states[i].status)
> + return perf->states[i].core_frequency;
> + }
> + return perf->states[i-1].core_frequency;
> +}
> +
> +static void
> +processor_get_freq (void *data)
> +{
> + unsigned int *freq = data;
> + int ret = 0;
> + u32 value = 0;
> + unsigned int clock_freq;
> +
> + ret = processor_get_pstate(&value);
> + if (ret) {
> + *freq = 0;
> + return;
> + }
> +
> + clock_freq = extract_clock(value);
> + *freq = (clock_freq*1000);
> + return;
> +}
> +
> +static unsigned int
> +acpi_cpufreq_get (unsigned int cpu)
> +{
> + unsigned int freq;
> +
> + if (!cpu_online(cpu))
> + return 0;
> +
> + if (cpu == smp_processor_id())
> + processor_get_freq((void*)&freq);
> + else
> + smp_call_function_single(cpu, processor_get_freq, (void *)&freq, 0,
> 1);
> +
> + return freq;
> +}
> +
> +static void
> +processor_set_pstate (void *data)
> +{
> + u32 *value = data;
> + s64 retval;
> +
> + retval = ia64_pal_set_pstate((u64)*value);
> +
> + if (retval)
> + *value = 1;
> + else
> + *value = 0;
> +}
> +
> +static int
> +processor_set_freq (struct acpi_cpufreq_data *data,
> + struct cpufreq_policy *policy, int state)
> +{
> + u32 value = 0;
> + unsigned int cpu = policy->cpu;
> +
> + if (!cpu_online(cpu))
> + return -ENODEV;
> +
> + if (state == data->acpi_data->state) {
> + if (unlikely(policy->resume)) {
> + printk(KERN_INFO"Called after resume, resetting to P%d\n",
> state);
> + policy->resume = 0;
> + } else {
> + printk(KERN_DEBUG"Already at target state (P%d)\n", state);
> + return 0;
> + }
> + }
> +
> + value = (u32) data->acpi_data->states[state].control;
> +
> + if (cpu == smp_processor_id())
> + processor_set_pstate((void *)&value);
> + else
> + smp_call_function_single(cpu, processor_set_pstate,
> + (void *)&value, 0, 1);
> +
> + if (value) {
> + printk(KERN_WARNING "Transition failed\n");
> + return -ENODEV;
> + }
> +
> + cpufreq_statistic_update(cpu, data->acpi_data->state, state);
> +
> + data->acpi_data->state = state;
> +
> + return 0;
> +}
> +
> +static int
> +acpi_cpufreq_target (struct cpufreq_policy *policy,
> + unsigned int target_freq, unsigned int relation)
> +{
> + struct acpi_cpufreq_data *data = drv_data[policy->cpu];
> + unsigned int next_state = 0;
> + unsigned int result = 0;
> +
> + result = cpufreq_frequency_table_target(policy,
> + data->freq_table, target_freq, relation, &next_state);
> + if (result)
> + return (result);
> +
> + result = processor_set_freq(data, policy, next_state);
> +
> + return (result);
> +}
> +
> +static int
> +acpi_cpufreq_verify (struct cpufreq_policy *policy)
> +{
> + struct acpi_cpufreq_data *data = drv_data[policy->cpu];
> + struct processor_performance *perf =
> &processor_pminfo[policy->cpu]->perf;
> +
> + if (!policy || !data)
> + return -EINVAL;
> +
> + cpufreq_verify_within_limits(policy, 0,
> + perf->states[perf->platform_limit].core_frequency * 1000);
> +
> + return cpufreq_frequency_table_verify(policy, data->freq_table);
> +}
> +
> +static int
> +acpi_cpufreq_cpu_init (struct cpufreq_policy *policy)
> +{
> + unsigned int i;
> + unsigned int cpu = policy->cpu;
> + unsigned int result = 0;
> + struct acpi_cpufreq_data *data;
> +
> + data = xmalloc(struct acpi_cpufreq_data);
> + if (!data)
> + return -ENOMEM;
> + memset(data, 0, sizeof(struct acpi_cpufreq_data));
> +
> + drv_data[cpu] = data;
> +
> + data->acpi_data = &processor_pminfo[cpu]->perf;
> +
> + /* capability check */
> + if (data->acpi_data->state_count <= 1) {
> + printk(KERN_WARNING "P-States\n");
> + result = -ENODEV;
> + goto err_unreg;
> + }
> +
> + if ((data->acpi_data->control_register.space_id !=
> + ACPI_ADR_SPACE_FIXED_HARDWARE) ||
> + (data->acpi_data->status_register.space_id !=
> + ACPI_ADR_SPACE_FIXED_HARDWARE)) {
> + result = -ENODEV;
> + goto err_unreg;
> + }
> +
> + data->freq_table = xmalloc_array(struct cpufreq_frequency_table,
> + (data->acpi_data->state_count + 1));
> + if (!data->freq_table) {
> + result = -ENOMEM;
> + goto err_unreg;
> + }
> +
> + /* detect transition latency */
> + policy->cpuinfo.transition_latency = 0;
> + for (i=0; i<data->acpi_data->state_count; i++) {
> + if ((data->acpi_data->states[i].transition_latency * 1000) >
> + policy->cpuinfo.transition_latency) {
> + policy->cpuinfo.transition_latency =
> + data->acpi_data->states[i].transition_latency * 1000;
> + }
> + }
> + policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
> +
> + policy->cur = acpi_cpufreq_get(policy->cpu);
> + printk(KERN_INFO "Current freq of CPU %u is %u\n", cpu, policy->cur);
> +
> + /* table init */
> + for (i = 0; i <= data->acpi_data->state_count; i++) {
> + data->freq_table[i].index = i;
> + if (i < data->acpi_data->state_count) {
> + data->freq_table[i].frequency =
> + data->acpi_data->states[i].core_frequency * 1000;
> + } else {
> + data->freq_table[i].frequency = CPUFREQ_TABLE_END;
> + }
> + }
> +
> + result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
> + if (result)
> + goto err_freqfree;
> +
> + data->acpi_data->state = 0;
> + policy->resume = 1;
> +
> + return result;
> +
> + err_freqfree:
> + xfree(data->freq_table);
> + err_unreg:
> + xfree(data);
> + drv_data[cpu] = NULL;
> +
> + return result;
> +}
> +
> +static int
> +acpi_cpufreq_cpu_exit (struct cpufreq_policy *policy)
> +{
> + struct acpi_cpufreq_data *data = drv_data[policy->cpu];
> +
> + if (data) {
> + drv_data[policy->cpu] = NULL;
> + xfree(data->freq_table);
> + xfree(data);
> + }
> +
> + return 0;
> +}
> +
> +static struct cpufreq_driver acpi_cpufreq_driver = {
> + .verify = acpi_cpufreq_verify,
> + .target = acpi_cpufreq_target,
> + .get = acpi_cpufreq_get,
> + .init = acpi_cpufreq_cpu_init,
> + .exit = acpi_cpufreq_cpu_exit,
> +};
> +
> +static int __init cpufreq_driver_init(void)
> +{
> + int ret = 0;
> +
> + if (cpufreq_controller == FREQCTL_xen)
> + ret = cpufreq_register_driver(&acpi_cpufreq_driver);
> +
> + return ret;
> +}
> +__initcall(cpufreq_driver_init);
> diff -r 2aaf950e6f50 xen/include/acpi/cpufreq/cpufreq.h
> --- a/xen/include/acpi/cpufreq/cpufreq.h Fri Sep 26 15:21:26 2008 +0800
> +++ b/xen/include/acpi/cpufreq/cpufreq.h Fri Sep 26 15:37:39 2008 +0800
> @@ -24,8 +24,10 @@
> struct acpi_cpufreq_data {
> struct processor_performance *acpi_data;
> struct cpufreq_frequency_table *freq_table;
> +#ifdef CONFIG_X86
> unsigned int max_freq;
> unsigned int cpu_feature;
> +#endif
> };
>
> struct cpufreq_cpuinfo {
>
>
>
--
yamahata
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