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authorLan Tianyu <tianyu.lan@intel.com>2013-06-27 15:08:54 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-27 21:51:09 +0200
commitf4fd3797848aa04e72e942c855fd279840a47fe4 (patch)
tree41419a82efe0e11be4f2cf870a58b3356e01ce0b /drivers/cpufreq/acpi-cpufreq.c
parent7c30ed532cf798a8d924562f2f44d03d7652f7a7 (diff)
downloadleg-kernel-f4fd3797848aa04e72e942c855fd279840a47fe4.tar.gz
acpi-cpufreq: Add new sysfs attribute freqdomain_cpus
Commits fcf8058 (cpufreq: Simplify cpufreq_add_dev()) and aa77a52 (cpufreq: acpi-cpufreq: Don't set policy->related_cpus from .init()) changed the contents of the "related_cpus" sysfs attribute on systems where acpi-cpufreq is used and user space can't get the list of CPUs which are in the same hardware coordination CPU domain (provided by the ACPI AML method _PSD) via "related_cpus" any more. To make up for that loss add a new sysfs attribute "freqdomian_cpus" for the acpi-cpufreq driver which exposes the list of CPUs in the same domain regardless of whether it is coordinated by hardware or software. [rjw: Changelog, documentation] References: https://bugzilla.kernel.org/show_bug.cgi?id=58761 Reported-by: Jean-Philippe Halimi <jean-philippe.halimi@exascale-computing.eu> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/acpi-cpufreq.c')
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 2c5906d71397..403dad646abe 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,
};