Commit aa77a52 and fcf8058 changes the content of "related_cpus" and user space can't get cpus which are in the same hardware coordination cpu domain (These info are provided by ACPI AML method _PSD) via "related_cpus". This change affects some users of original "related_cpus". This patch is to add a new sysfs attribute "freqdomian_cpus" for acpi-cpufreq driver which exposes all cpus in the same domain regardless of hardware or software coordination to make up the info loss of previous change. Reference:https://bugzilla.kernel.org/show_bug.cgi?id=58761 Reported-by: Jean-Philippe Halimi <jean-philippe.halimi@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx> --- Change since v1: Create new file acpi-cpufreq.txt under Documentation/cpu-freq and move new attribute descriptor to it. Add new field freqdomain_cpus in struct acpi_cpufreq_data and record cpu domain info in it. For AMD case, use sibling cpus info to overwrite cpu domain info from ACPI. Change since v2: Move new attribute descriptor to Documentation/ABI/testing/ sysfs-devices-system-cpu and update descriptor content according Viresh's comment. http://www.spinics.net/lists/cpufreq/msg06119.html Documentation/ABI/testing/sysfs-devices-system-cpu | 15 +++++++++++++ drivers/cpufreq/acpi-cpufreq.c | 23 +++++++++++++++++++- drivers/cpufreq/cpufreq.c | 7 +++--- include/linux/cpufreq.h | 3 +++ 4 files changed, 44 insertions(+), 4 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 2447698..c72fccc 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -144,6 +144,21 @@ Description: Discover and change clock speed of CPUs to learn how to control the knobs. +What: /sys/devices/system/cpu/cpu#/cpufreq/freqdomain_cpus +Date: June 2013 +Contact: cpufreq@xxxxxxxxxxxxxxx +Description: Discover CPUs in the same CPU frequency dependency domain + + "freqdomain_cpus" are the list of cpus (online+offline) that share + same clock/freq domain at hardware level. This information might + be hidden from cpufreq core and so related_cpus can have different + value compared to this. This is not used by kernel but userspace + DVFS controllers to get better power/performance values for platforms + using acpi-cpufreq.c driver. + + This file is only present if the acpi-cpufreq driver is in use. + + What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} Date: August 2008 KernelVersion: 2.6.27 diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index f4fef0a..3926402 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -70,6 +70,7 @@ struct acpi_cpufreq_data { struct cpufreq_frequency_table *freq_table; unsigned int resume; unsigned int cpu_feature; + cpumask_var_t freqdomain_cpus; }; static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data); @@ -176,6 +177,15 @@ static struct global_attr global_boost = __ATTR(boost, 0644, show_global_boost, store_global_boost); +static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf) +{ + struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); + + return cpufreq_show_cpus(data->freqdomain_cpus, buf); +} + +cpufreq_freq_attr_ro(freqdomain_cpus); + #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf, size_t count) @@ -704,6 +714,11 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) if (!data) return -ENOMEM; + if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) { + result = -ENOMEM; + goto err_free; + } + data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); per_cpu(acfreq_data, cpu) = data; @@ -712,7 +727,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) result = acpi_processor_register_performance(data->acpi_data, cpu); if (result) - goto err_free; + goto err_free_mask; perf = data->acpi_data; policy->shared_type = perf->shared_type; @@ -725,6 +740,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) 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); @@ -736,6 +752,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) { cpumask_clear(policy->cpus); cpumask_set_cpu(cpu, policy->cpus); + cpumask_copy(data->freqdomain_cpus, cpu_sibling_mask(cpu)); policy->shared_type = CPUFREQ_SHARED_TYPE_HW; pr_info_once(PFX "overriding BIOS provided _PSD data\n"); } @@ -870,6 +887,8 @@ err_freqfree: kfree(data->freq_table); err_unreg: acpi_processor_unregister_performance(perf, cpu); +err_free_mask: + free_cpumask_var(data->freqdomain_cpus); err_free: kfree(data); per_cpu(acfreq_data, cpu) = NULL; @@ -888,6 +907,7 @@ static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) per_cpu(acfreq_data, policy->cpu) = NULL; acpi_processor_unregister_performance(data->acpi_data, policy->cpu); + free_cpumask_var(data->freqdomain_cpus); kfree(data->freq_table); kfree(data); } @@ -908,6 +928,7 @@ static int acpi_cpufreq_resume(struct cpufreq_policy *policy) static struct freq_attr *acpi_cpufreq_attr[] = { &cpufreq_freq_attr_scaling_available_freqs, + &freqdomain_cpus, NULL, /* this is a placeholder for cpb, do not remove */ NULL, }; diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index d976e22..adf12a9f 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -573,7 +573,7 @@ out: return i; } -static ssize_t show_cpus(const struct cpumask *mask, char *buf) +ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) { ssize_t i = 0; unsigned int cpu; @@ -588,6 +588,7 @@ static ssize_t show_cpus(const struct cpumask *mask, char *buf) i += sprintf(&buf[i], "\n"); return i; } +EXPORT_SYMBOL_GPL(cpufreq_show_cpus); /** * show_related_cpus - show the CPUs affected by each transition even if @@ -595,7 +596,7 @@ static ssize_t show_cpus(const struct cpumask *mask, char *buf) */ static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) { - return show_cpus(policy->related_cpus, buf); + return cpufreq_show_cpus(policy->related_cpus, buf); } /** @@ -603,7 +604,7 @@ static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) */ static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) { - return show_cpus(policy->cpus, buf); + return cpufreq_show_cpus(policy->cpus, buf); } static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 3c7ee2f..5fedb6c 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -438,4 +438,7 @@ void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); void cpufreq_frequency_table_put_attr(unsigned int cpu); + +ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); + #endif /* _LINUX_CPUFREQ_H */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
