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acpi-cpufreq: replace per_cpu with driver_data of policy 

Drivers can store their internal per-policy information in
policy->driver_data, lets use it.

we have benefits after this replacing.
1) memory saving.
2) policy is shared by several cpus, per_cpu seems not correct. using
*driver_data* is more reasonable.
3) fix a memory leak in acpi_cpufreq_cpu_exit. as policy->cpu might
change during cpu hotplug. So sometimes we cant't free *data*, use
*driver_data* to fix it.
4) fix a zero return value of get_cur_freq_on_cpu. Only per_cpu of
policy->cpu is set to *data*, if we try to get cpufreq on other cpus, we
get zero instead of correct values. Use *driver_data* to fix it.

Signed-off-by: Pan Xinhui <xinhuix.pan@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Pan Xinhui 2015-07-07 20:43:26 +08:00 committed by Rafael J. Wysocki
parent 5a31d594a9
commit eb0b3e78e6
1 changed files with 22 additions and 18 deletions
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40
drivers/cpufreq/acpi-cpufreq.c
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@ -72,8 +72,6 @@ struct acpi_cpufreq_data {
cpumask_var_t freqdomain_cpus;
};
static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
/* acpi_perf_data is a pointer to percpu data. */
static struct acpi_processor_performance __percpu *acpi_perf_data;
@ -144,7 +142,7 @@ static int _store_boost(int val)
static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
{
struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
struct acpi_cpufreq_data *data = policy->driver_data;
return cpufreq_show_cpus(data->freqdomain_cpus, buf);
}
@ -327,7 +325,8 @@ static void drv_write(struct drv_cmd *cmd)
put_cpu();
}
static u32 get_cur_val(const struct cpumask *mask)
static u32
get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)
{
struct acpi_processor_performance *perf;
struct drv_cmd cmd;
@ -335,7 +334,7 @@ static u32 get_cur_val(const struct cpumask *mask)
if (unlikely(cpumask_empty(mask)))
return 0;
switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
switch (data->cpu_feature) {
case SYSTEM_INTEL_MSR_CAPABLE:
cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
@ -346,7 +345,7 @@ static u32 get_cur_val(const struct cpumask *mask)
break;
case SYSTEM_IO_CAPABLE:
cmd.type = SYSTEM_IO_CAPABLE;
perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
perf = data->acpi_data;
cmd.addr.io.port = perf->control_register.address;
cmd.addr.io.bit_width = perf->control_register.bit_width;
break;
@ -364,19 +363,24 @@ static u32 get_cur_val(const struct cpumask *mask)
static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
{
struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
struct acpi_cpufreq_data *data;
struct cpufreq_policy *policy;
unsigned int freq;
unsigned int cached_freq;
pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
if (unlikely(data == NULL ||
data->acpi_data == NULL || data->freq_table == NULL)) {
policy = cpufreq_cpu_get(cpu);
if (unlikely(!policy))
return 0;
data = policy->driver_data;
cpufreq_cpu_put(policy);
if (unlikely(!data || !data->acpi_data || !data->freq_table))
return 0;
}
cached_freq = data->freq_table[data->acpi_data->state].frequency;
freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
freq = extract_freq(get_cur_val(cpumask_of(cpu), data), data);
if (freq != cached_freq) {
/*
* The dreaded BIOS frequency change behind our back.
@ -397,7 +401,7 @@ static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
unsigned int i;
for (i = 0; i < 100; i++) {
cur_freq = extract_freq(get_cur_val(mask), data);
cur_freq = extract_freq(get_cur_val(mask, data), data);
if (cur_freq == freq)
return 1;
udelay(10);
@ -408,7 +412,7 @@ static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
static int acpi_cpufreq_target(struct cpufreq_policy *policy,
unsigned int index)
{
struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
struct acpi_cpufreq_data *data = policy->driver_data;
struct acpi_processor_performance *perf;
struct drv_cmd cmd;
unsigned int next_perf_state = 0; /* Index into perf table */
@ -673,7 +677,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
}
data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
per_cpu(acfreq_data, cpu) = data;
policy->driver_data = data;
if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
@ -843,19 +847,19 @@ err_free_mask:
free_cpumask_var(data->freqdomain_cpus);
err_free:
kfree(data);
per_cpu(acfreq_data, cpu) = NULL;
policy->driver_data = NULL;
return result;
}
static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
struct acpi_cpufreq_data *data = policy->driver_data;
pr_debug("acpi_cpufreq_cpu_exit\n");
if (data) {
per_cpu(acfreq_data, policy->cpu) = NULL;
policy->driver_data = NULL;
acpi_processor_unregister_performance(data->acpi_data,
policy->cpu);
free_cpumask_var(data->freqdomain_cpus);
@ -868,7 +872,7 @@ static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
{
struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
struct acpi_cpufreq_data *data = policy->driver_data;
pr_debug("acpi_cpufreq_resume\n");