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ACPI: CPPC: Add AMD pstate energy performance preference cppc control

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Add support for setting and querying EPP preferences to the generic
CPPC driver.  This enables downstream drivers such as amd-pstate to discover
and use these values.

Downstream drivers that want to use the new symbols cppc_get_epp_caps
and cppc_set_epp_perf for querying and setting EPP preferences will need
to call cppc_set_epp_perf to enable the EPP function firstly.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Wyes Karny <wyes.karny@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Perry Yuan 2023-01-31 17:00:06 +08:00 committed by Rafael J. Wysocki
parent 38a29e5834
commit 7bc1fcd399
2 changed files with 79 additions and 0 deletions
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67
drivers/acpi/cppc_acpi.c
View File

@ -1153,6 +1153,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf);
}
/**
* cppc_get_epp_perf - Get the epp register value.
* @cpunum: CPU from which to get epp preference value.
* @epp_perf: Return address.
*
* Return: 0 for success, -EIO otherwise.
*/
int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return cppc_get_perf(cpunum, ENERGY_PERF, epp_perf);
}
EXPORT_SYMBOL_GPL(cppc_get_epp_perf);
/**
* cppc_get_perf_caps - Get a CPU's performance capabilities.
* @cpunum: CPU from which to get capabilities info.
@ -1365,6 +1378,60 @@ out_err:
}
EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);
/*
* Set Energy Performance Preference Register value through
* Performance Controls Interface
*/
int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
{
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_register_resource *epp_set_reg;
struct cpc_register_resource *auto_sel_reg;
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
struct cppc_pcc_data *pcc_ss_data = NULL;
int ret;
if (!cpc_desc) {
pr_debug("No CPC descriptor for CPU:%d\n", cpu);
return -ENODEV;
}
auto_sel_reg = &cpc_desc->cpc_regs[AUTO_SEL_ENABLE];
epp_set_reg = &cpc_desc->cpc_regs[ENERGY_PERF];
if (CPC_IN_PCC(epp_set_reg) || CPC_IN_PCC(auto_sel_reg)) {
if (pcc_ss_id < 0) {
pr_debug("Invalid pcc_ss_id for CPU:%d\n", cpu);
return -ENODEV;
}
if (CPC_SUPPORTED(auto_sel_reg)) {
ret = cpc_write(cpu, auto_sel_reg, enable);
if (ret)
return ret;
}
if (CPC_SUPPORTED(epp_set_reg)) {
ret = cpc_write(cpu, epp_set_reg, perf_ctrls->energy_perf);
if (ret)
return ret;
}
pcc_ss_data = pcc_data[pcc_ss_id];
down_write(&pcc_ss_data->pcc_lock);
/* after writing CPC, transfer the ownership of PCC to platform */
ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
up_write(&pcc_ss_data->pcc_lock);
} else {
ret = -ENOTSUPP;
pr_debug("_CPC in PCC is not supported\n");
}
return ret;
}
EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
/**
* cppc_set_enable - Set to enable CPPC on the processor by writing the
* Continuous Performance Control package EnableRegister field.

12
include/acpi/cppc_acpi.h
View File

@ -108,12 +108,14 @@ struct cppc_perf_caps {
u32 lowest_nonlinear_perf;
u32 lowest_freq;
u32 nominal_freq;
u32 energy_perf;
};
struct cppc_perf_ctrls {
u32 max_perf;
u32 min_perf;
u32 desired_perf;
u32 energy_perf;
};
struct cppc_perf_fb_ctrs {
@ -149,6 +151,8 @@ extern bool cpc_ffh_supported(void);
extern bool cpc_supported_by_cpu(void);
extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
#else /* !CONFIG_ACPI_CPPC_LIB */
static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
@ -202,6 +206,14 @@ static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
{
return -ENOTSUPP;
}
static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
{
return -ENOTSUPP;
}
static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return -ENOTSUPP;
}
#endif /* !CONFIG_ACPI_CPPC_LIB */
#endif /* _CPPC_ACPI_H*/