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ACPI / CPPC: Add a helper to get desired performance

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This patch add a helper to get the value of desired performance
register.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
[ rjw: More white space ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Xiongfeng Wang 2019-02-17 11:54:14 +08:00 committed by Rafael J. Wysocki
parent a9a22b570b
commit 1757d05f31
2 changed files with 43 additions and 0 deletions
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42
drivers/acpi/cppc_acpi.c
View File

@ -1050,6 +1050,48 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
return ret_val;
}
/**
* cppc_get_desired_perf - Get the value of desired performance register.
* @cpunum: CPU from which to get desired performance.
* @desired_perf: address of a variable to store the returned desired performance
*
* Return: 0 for success, -EIO otherwise.
*/
int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
struct cpc_register_resource *desired_reg;
struct cppc_pcc_data *pcc_ss_data = NULL;
desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF];
if (CPC_IN_PCC(desired_reg)) {
int ret = 0;
if (pcc_ss_id < 0)
return -EIO;
pcc_ss_data = pcc_data[pcc_ss_id];
down_write(&pcc_ss_data->pcc_lock);
if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0)
cpc_read(cpunum, desired_reg, desired_perf);
else
ret = -EIO;
up_write(&pcc_ss_data->pcc_lock);
return ret;
}
cpc_read(cpunum, desired_reg, desired_perf);
return 0;
}
EXPORT_SYMBOL_GPL(cppc_get_desired_perf);
/**
* cppc_get_perf_caps - Get a CPUs performance capabilities.
* @cpunum: CPU from which to get capabilities info.

1
include/acpi/cppc_acpi.h
View File

@ -137,6 +137,7 @@ struct cppc_cpudata {
cpumask_var_t shared_cpu_map;
};
extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);