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ACPI: CPPC: Add three functions related to autonomous selection

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cppc_set_epp() - write energy performance preference register value,
based on ACPI 6.5, s8.4.6.1.7

cppc_get_auto_act_window() - read autonomous activity window register
value, based on ACPI 6.5, s8.4.6.1.6

cppc_set_auto_act_window() - write autonomous activity window register
value, based on ACPI 6.5, s8.4.6.1.6

Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20250411093855.982491-9-zhenglifeng1@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lifeng Zheng 2025-04-11 17:38:55 +08:00 committed by Rafael J. Wysocki
parent 2605e4ab66
commit f35e5b3ccf
2 changed files with 107 additions and 0 deletions
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83
drivers/acpi/cppc_acpi.c
View File

@ -1601,6 +1601,89 @@ int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
}
EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
/**
* cppc_set_epp() - Write the EPP register.
* @cpu: CPU on which to write register.
* @epp_val: Value to write to the EPP register.
*/
int cppc_set_epp(int cpu, u64 epp_val)
{
if (epp_val > CPPC_ENERGY_PERF_MAX)
return -EINVAL;
return cppc_set_reg_val(cpu, ENERGY_PERF, epp_val);
}
EXPORT_SYMBOL_GPL(cppc_set_epp);
/**
* cppc_get_auto_act_window() - Read autonomous activity window register.
* @cpu: CPU from which to read register.
* @auto_act_window: Return address.
*
* According to ACPI 6.5, s8.4.6.1.6, the value read from the autonomous
* activity window register consists of two parts: a 7 bits value indicate
* significand and a 3 bits value indicate exponent.
*/
int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
{
unsigned int exp;
u64 val, sig;
int ret;
if (auto_act_window == NULL)
return -EINVAL;
ret = cppc_get_reg_val(cpu, AUTO_ACT_WINDOW, &val);
if (ret)
return ret;
sig = val & CPPC_AUTO_ACT_WINDOW_MAX_SIG;
exp = (val >> CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) & CPPC_AUTO_ACT_WINDOW_MAX_EXP;
*auto_act_window = sig * int_pow(10, exp);
return 0;
}
EXPORT_SYMBOL_GPL(cppc_get_auto_act_window);
/**
* cppc_set_auto_act_window() - Write autonomous activity window register.
* @cpu: CPU on which to write register.
* @auto_act_window: usec value to write to the autonomous activity window register.
*
* According to ACPI 6.5, s8.4.6.1.6, the value to write to the autonomous
* activity window register consists of two parts: a 7 bits value indicate
* significand and a 3 bits value indicate exponent.
*/
int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
{
/* The max value to store is 1270000000 */
u64 max_val = CPPC_AUTO_ACT_WINDOW_MAX_SIG * int_pow(10, CPPC_AUTO_ACT_WINDOW_MAX_EXP);
int exp = 0;
u64 val;
if (auto_act_window > max_val)
return -EINVAL;
/*
* The max significand is 127, when auto_act_window is larger than
* 129, discard the precision of the last digit and increase the
* exponent by 1.
*/
while (auto_act_window > CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH) {
auto_act_window /= 10;
exp += 1;
}
/* For 128 and 129, cut it to 127. */
if (auto_act_window > CPPC_AUTO_ACT_WINDOW_MAX_SIG)
auto_act_window = CPPC_AUTO_ACT_WINDOW_MAX_SIG;
val = (exp << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) + auto_act_window;
return cppc_set_reg_val(cpu, AUTO_ACT_WINDOW, val);
}
EXPORT_SYMBOL_GPL(cppc_set_auto_act_window);
/**
* cppc_get_auto_sel() - Read autonomous selection register.
* @cpu: CPU from which to read register.

24
include/acpi/cppc_acpi.h
View File

@ -32,6 +32,15 @@
#define CMD_READ 0
#define CMD_WRITE 1
#define CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE (7)
#define CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE (3)
#define CPPC_AUTO_ACT_WINDOW_MAX_SIG ((1 << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) - 1)
#define CPPC_AUTO_ACT_WINDOW_MAX_EXP ((1 << CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE) - 1)
/* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
#define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
#define CPPC_ENERGY_PERF_MAX (0xFF)
/* Each register has the folowing format. */
struct cpc_reg {
u8 descriptor;
@ -159,6 +168,9 @@ 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_set_epp(int cpu, u64 epp_val);
extern int cppc_get_auto_act_window(int cpu, u64 *auto_act_window);
extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window);
extern int cppc_get_auto_sel(int cpu, bool *enable);
extern int cppc_set_auto_sel(int cpu, bool enable);
extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
@ -229,6 +241,18 @@ static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_epp(int cpu, u64 epp_val)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_auto_sel(int cpu, bool *enable)
{
return -EOPNOTSUPP;