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ACPI: CPPC: Add auto select register read/write support

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For some AMD shared memory based systems, the autonomous selection bit
needed to be set explicitly. Add autonomous selection register related
APIs to acpi driver, which amd_pstate driver uses later.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
[ rjw: Fixed up kerneldoc comments, white space adjustment, subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Wyes Karny 2023-03-07 11:27:36 +00:00 committed by Rafael J. Wysocki
parent 76531df5e1
commit c984f5d5d4
2 changed files with 107 additions and 0 deletions
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96
drivers/acpi/cppc_acpi.c
View File

@ -1433,6 +1433,102 @@ int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
}
EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
/**
* cppc_get_auto_sel_caps - Read autonomous selection register.
* @cpunum : CPU from which to read register.
* @perf_caps : struct where autonomous selection register value is updated.
*/
int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
{
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
struct cpc_register_resource *auto_sel_reg;
u64 auto_sel;
if (!cpc_desc) {
pr_debug("No CPC descriptor for CPU:%d\n", cpunum);
return -ENODEV;
}
auto_sel_reg = &cpc_desc->cpc_regs[AUTO_SEL_ENABLE];
if (!CPC_SUPPORTED(auto_sel_reg))
pr_warn_once("Autonomous mode is not unsupported!\n");
if (CPC_IN_PCC(auto_sel_reg)) {
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
struct cppc_pcc_data *pcc_ss_data = NULL;
int ret = 0;
if (pcc_ss_id < 0)
return -ENODEV;
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, auto_sel_reg, &auto_sel);
perf_caps->auto_sel = (bool)auto_sel;
} else {
ret = -EIO;
}
up_write(&pcc_ss_data->pcc_lock);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(cppc_get_auto_sel_caps);
/**
* cppc_set_auto_sel - Write autonomous selection register.
* @cpu : CPU to which to write register.
* @enable : the desired value of autonomous selection resiter to be updated.
*/
int cppc_set_auto_sel(int cpu, bool enable)
{
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
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 = -EINVAL;
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];
if (CPC_IN_PCC(auto_sel_reg)) {
if (pcc_ss_id < 0) {
pr_debug("Invalid pcc_ss_id\n");
return -ENODEV;
}
if (CPC_SUPPORTED(auto_sel_reg)) {
ret = cpc_write(cpu, auto_sel_reg, enable);
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_auto_sel);
/**
* cppc_set_enable - Set to enable CPPC on the processor by writing the
* Continuous Performance Control package EnableRegister field.

11
include/acpi/cppc_acpi.h
View File

@ -109,6 +109,7 @@ struct cppc_perf_caps {
u32 lowest_freq;
u32 nominal_freq;
u32 energy_perf;
bool auto_sel;
};
struct cppc_perf_ctrls {
@ -153,6 +154,8 @@ 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);
extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps);
extern int cppc_set_auto_sel(int cpu, bool enable);
#else /* !CONFIG_ACPI_CPPC_LIB */
static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
@ -214,6 +217,14 @@ static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return -ENOTSUPP;
}
static inline int cppc_set_auto_sel(int cpu, bool enable)
{
return -ENOTSUPP;
}
static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
{
return -ENOTSUPP;
}
#endif /* !CONFIG_ACPI_CPPC_LIB */
#endif /* _CPPC_ACPI_H*/