Commit 261a5963 authored by heppen's avatar heppen
Browse files

ACPI: CPPC: Introduce new EPP capabilities and update auto selection functions 

huawei inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB5JJG


CVE: NA

--------------------------------------------------

Maintained compatibility with existing CPPC register read/write interfaces：
- Added cppc_get_epp_caps() to read the Energy Performance Preference (EPP) register.
- Updated cppc_set_auto_sel() to cppc_set_auto_sel_caps() for better clarity and functionality.
- Modified cppc_cpufreq and cpufreq_seep to utilize the new EPP and auto selection functions.

Signed-off-by: default avatarPeng He <hepeng68@huawei.com>
parent 0cdbb920

drivers/acpi/cppc_acpi.c

+27 −15
Original line number Diff line number Diff line
@@ -1209,11 +1209,6 @@ static int cppc_get_perf(int cpunum, enum cppc_regs reg_idx, u64 *perf) 
		return ret;

	}



	if (!CPC_SUPPORTED(reg)) {

		pr_debug("CPC register %d is not supported\n", reg_idx);

		return -EOPNOTSUPP;

	}



	cpc_read(cpunum, reg, perf);



	return 0;
@@ -1628,6 +1623,17 @@ static int cppc_set_reg(int cpu, enum cppc_regs reg_idx, u64 val) 
	return cpc_write(cpu, reg, val);

}



/*

 * cppc_get_epp_caps() - Read the EPP register

 * @cpunum: CPU from which to read register.

 * @epp_val: address of a variable to store the returned EPP value.

*/

int cppc_get_epp_caps(int cpunum, u64 *epp_val)

{

	return cppc_get_reg(cpunum, ENERGY_PERF, epp_val);

}

EXPORT_SYMBOL_GPL(cppc_get_epp_caps);



/**

 * cppc_set_epp() - Write the EPP register

 * @cpu:CPU on which to write register.
@@ -1664,7 +1670,7 @@ EXPORT_SYMBOL_GPL(cppc_set_auto_act_window); 
/**

 * cppc_get_auto_sel() - Read autonomous selection register.

 * @cpunum:CPU from which to read register.

 * @auto_act_window:Return address.

 * @auto_sel:Return address.

*/

int cppc_get_auto_sel(int cpunum, u64 *auto_sel)

{
@@ -1672,6 +1678,17 @@ int cppc_get_auto_sel(int cpunum, u64 *auto_sel) 
}

EXPORT_SYMBOL_GPL(cppc_get_auto_sel);



/**

 * cppc_set_auto_sel_caps() - Write autonomous selection register.

 * @cpu: CPU on which to write register.

 * @enable: the desired value of autonomous selection resiter to be updated.

*/

int cppc_set_auto_sel_caps(int cpu, bool enable)

{

	return cppc_set_reg(cpu, AUTO_SEL_ENABLE, enable);

}

EXPORT_SYMBOL_GPL(cppc_set_auto_sel_caps);



/**

 * cppc_get_auto_sel_caps - Read autonomous selection register.

 * @cpunum : CPU from which to read register.
@@ -1759,17 +1776,12 @@ int cppc_set_auto_sel(int cpu, bool enable) 
		/* 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);



		return ret;

	}



	if (!CPC_SUPPORTED(auto_sel_reg)) {

		pr_debug("CPC register (reg_idx=%u) is not supported\n",

			 AUTO_SEL_ENABLE);

		return -EOPNOTSUPP;

	} else {

		ret = -ENOTSUPP;

		pr_debug("_CPC in PCC is not supported\n");

	}



	return cpc_write(cpu, auto_sel_reg, enable);

	return ret;

}

EXPORT_SYMBOL_GPL(cppc_set_auto_sel);

drivers/cpufreq/cppc_cpufreq.c

+1 −1
Original line number Diff line number Diff line
@@ -898,7 +898,7 @@ static ssize_t show_energy_perf(struct cpufreq_policy *policy, char *buf) 
	u64 val;

	int ret;



	ret = cppc_get_epp_perf(policy->cpu, &val);

	ret = cppc_get_epp_caps(policy->cpu, &val);



	/* show "<unsupported>" when this register is not supported by cpc */

	if (ret == -EOPNOTSUPP)

drivers/cpufreq/cpufreq_seep.c

+2 −2
Original line number Diff line number Diff line
@@ -52,7 +52,7 @@ static int cpufreq_gov_seep_start(struct cpufreq_policy *policy) 
	int ret;



	/* Enable BIOS frequency Scaling */

	ret = cppc_set_auto_sel(policy->cpu, 1);

	ret = cppc_set_auto_sel_caps(policy->cpu, 1);

	if (ret)

		pr_err("Failed to enable auto_sel: %d\n", ret);

	return ret;
@@ -67,7 +67,7 @@ static void cpufreq_gov_seep_stop(struct cpufreq_policy *policy) 
	int ret;



	/* Disable BIOS frequency Scaling */

	ret = cppc_set_auto_sel(policy->cpu, 0);

	ret = cppc_set_auto_sel_caps(policy->cpu, 0);

	if (ret)

		pr_err("Failed to disable auto_sel: %d\n", ret);

}

include/acpi/cppc_acpi.h

+10 −0
Original line number Diff line number Diff line
@@ -161,10 +161,12 @@ 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);

extern int cppc_get_epp_caps(int cpunum, u64 *epp_val);

extern int cppc_set_epp(int cpu, u64 epp_val);

extern int cppc_get_auto_act_window(int cpunum, u64 *auto_act_window);

extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window);

extern int cppc_get_auto_sel(int cpunum, u64 *auto_sel);

extern int cppc_set_auto_sel_caps(int cpu, bool enable);

#else /* !CONFIG_ACPI_CPPC_LIB */

static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)

{
@@ -238,6 +240,10 @@ static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf 
{

	return -ENOTSUPP;

}

static inline int cppc_get_epp_caps(int cpunum, u64 *epp_val)

{

	return -EOPNOTSUPP;

}

static inline int cppc_set_epp(int cpu, u64 epp_val)

{

	return -EOPNOTSUPP;
@@ -254,6 +260,10 @@ static inline int cppc_get_auto_sel(int cpunum, u64 *auto_sel) 
{

	return -EOPNOTSUPP;

}

static inline int cppc_set_auto_sel_caps(int cpu, bool enable)

{

	return -EOPNOTSUPP;

}



#endif /* !CONFIG_ACPI_CPPC_LIB */