int
acpi_processor_register_performance(struct acpi_processor_performance
*performance, unsigned int cpu)
{
struct acpi_processor *pr;
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
return -EINVAL;
mutex_lock(&performance_mutex);
pr = per_cpu(processors, cpu);
if (!pr) {
mutex_unlock(&performance_mutex);
return -ENODEV;
}
if (pr->performance) {
mutex_unlock(&performance_mutex);
return -EBUSY;
}
WARN_ON(!performance);
pr->performance = performance;
if (acpi_processor_get_performance_info(pr)) {
pr->performance = NULL;
mutex_unlock(&performance_mutex);
return -EIO;
}
mutex_unlock(&performance_mutex);
return 0;
}
int
acpi_processor_register_performance(struct acpi_processor_performance
*performance, unsigned int cpu)
{
struct acpi_processor *pr;
ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
return_VALUE(-EINVAL);
down(&performance_sem);
pr = processors[cpu];
if (!pr) {
up(&performance_sem);
return_VALUE(-ENODEV);
}
if (pr->performance) {
up(&performance_sem);
return_VALUE(-EBUSY);
}
WARN_ON(!performance);
pr->performance = performance;
if (acpi_processor_get_performance_info(pr)) {
pr->performance = NULL;
up(&performance_sem);
return_VALUE(-EIO);
}
acpi_cpufreq_add_file(pr);
up(&performance_sem);
return_VALUE(0);
}
/**ltl
* 功能: 对cpu的P-state初始化
* 参数: performane ->cpu性能对象
* cpu ->cpu id
* 返回值:
* 说明: 1.读取_PCT和_PSS两个对象信息
* 2.创建文件/proc/acpi/processor/CPU1/proformance
*/
int
acpi_processor_register_performance(struct acpi_processor_performance
*performance, unsigned int cpu)
{
struct acpi_processor *pr;
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
return -EINVAL;
mutex_lock(&performance_mutex);
/* acpi_process对象 */
pr = processors[cpu];
if (!pr) {
mutex_unlock(&performance_mutex);
return -ENODEV;
}
if (pr->performance) {
mutex_unlock(&performance_mutex);
return -EBUSY;
}
WARN_ON(!performance);
pr->performance = performance; /* 设置cpu性能 */
/* 读取_PCT、_PSS两个对象信息 */
if (acpi_processor_get_performance_info(pr)) {
pr->performance = NULL;
mutex_unlock(&performance_mutex);
return -EIO;
}
/* 创建文件/proc/acpi/processor/CPU1/proformance */
acpi_cpufreq_add_file(pr);
mutex_unlock(&performance_mutex);
return 0;
}
/*
* Existing ACPI module does parse performance states at some point,
* when acpi-cpufreq driver is loaded which however is something
* we'd like to disable to avoid confliction with external control
* logic. So we have to collect raw performance information here
* when ACPI processor object is found and started.
*/
static int processor_extcntl_get_performance(struct acpi_processor *pr)
{
int ret;
struct acpi_processor_performance *perf;
struct acpi_psd_package *pdomain;
if (pr->performance)
return -EBUSY;
perf = kzalloc(sizeof(struct acpi_processor_performance), GFP_KERNEL);
if (!perf)
return -ENOMEM;
pr->performance = perf;
/* Get basic performance state information */
ret = acpi_processor_get_performance_info(pr);
if (ret < 0)
goto err_out;
/*
* Well, here we need retrieve performance dependency information
* from _PSD object. The reason why existing interface is not used
* is due to the reason that existing interface sticks to Linux cpu
* id to construct some bitmap, however we want to split ACPI
* processor objects from Linux cpu id logic. For example, even
* when Linux is configured as UP, we still want to parse all ACPI
* processor objects to external logic. In this case, it's preferred
* to use ACPI ID instead.
*/
pdomain = &pr->performance->domain_info;
pdomain->num_processors = 0;
ret = acpi_processor_get_psd(pr);
if (ret < 0) {
/*
* _PSD is optional - assume no coordination if absent (or
* broken), matching native kernels' behavior.
*/
pdomain->num_entries = ACPI_PSD_REV0_ENTRIES;
pdomain->revision = ACPI_PSD_REV0_REVISION;
pdomain->domain = pr->acpi_id;
pdomain->coord_type = DOMAIN_COORD_TYPE_SW_ALL;
pdomain->num_processors = 1;
}
/* Some sanity check */
if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
(pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) ||
((pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL) &&
(pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY) &&
(pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL))) {
ret = -EINVAL;
goto err_out;
}
/* Last step is to notify BIOS that external logic exists */
processor_notify_smm();
processor_notify_external(pr, PROCESSOR_PM_INIT, PM_TYPE_PERF);
return 0;
err_out:
pr->performance = NULL;
kfree(perf);
return ret;
}
