Commit 6d474065 authored by heppen's avatar heppen
Browse files

ACPI: CPPC: Add three register ABIs 

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


CVE: NA

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

cppc_set_epp - write energy performance preference register

cppc_get_auto_act_window - read autonomous activity window register

cppc_set_auto_act_window - write autonomous activity window register

cppc_get_auto_sel - read autonomous selection enable register

cppc_set_auto_sel - Write autonomous selection register

Signed-off-by: default avatarPeng He <hepeng68@huawei.com>
parent f1a4fad5

drivers/acpi/cppc_acpi.c

+150 −0
Original line number Diff line number Diff line
@@ -1215,6 +1215,100 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) 
	return ret_val;

}



static int cppc_get_reg(int cpunum, enum cppc_regs reg_idx, u64 *val)

{

	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);

	struct cppc_pcc_data *pcc_ss_data = NULL;

	struct cpc_register_resource *reg;

	int pcc_ss_id;

	int ret = 0;



	if (!cpc_desc) {

		pr_debug("No CPC descriptor for CPU:%d\n", cpunum);

		return -ENODEV;

	}



	reg = &cpc_desc->cpc_regs[reg_idx];



	if (!CPC_SUPPORTED(reg)) {

		pr_debug("CPC register is not supported\n");

		return -EOPNOTSUPP;

	}



	if (CPC_IN_PCC(reg)) {

		pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);



		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, reg, val);

		else

			ret = -EIO;



		up_write(&pcc_ss_data->pcc_lock);



		return ret;

	}



	cpc_read(cpunum, reg, val);



	return 0;

}



static int cppc_set_reg(int cpu, enum cppc_regs reg_idx, u64 val)

{

	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);

	struct cppc_pcc_data *pcc_ss_data = NULL;

	struct cpc_register_resource *reg;

	int pcc_ss_id;

	int ret;



	if (!cpc_desc) {

		pr_debug("No CPC descriptor for CPU:%d\n", cpu);

		return -ENODEV;

	}



	reg = &cpc_desc->cpc_regs[reg_idx];



	if (!CPC_SUPPORTED(reg)) {

		pr_debug("CPC register is not supported\n");

		return -EOPNOTSUPP;

	}



	if (CPC_IN_PCC(reg)) {

		pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);



		if (pcc_ss_id < 0) {

			pr_debug("Invalid pcc_ss_id\n");

			return -ENODEV;

		}



		ret = cpc_write(cpu, reg, val);

		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);

		return ret;

	}



	return cpc_write(cpu, reg, val);

}



int cppc_get_epp_perf(int cpunum, u64 *epp_perf)

{

	return cppc_get_reg(cpunum, ENERGY_PERF, epp_perf);

}

EXPORT_SYMBOL_GPL(cppc_get_epp_perf);



/**

 * cppc_get_desired_perf - Get the value of desired performance register.

 * @cpunum: CPU from which to get desired performance.
@@ -1427,6 +1521,62 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) 
}

EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);



/**

 * cppc_set_auto_act_window - Write autonomous act window register.

 * @cpu    : CPU to which to write register.

 * @enable : the desired value of autonomous act window register to be updated.

 */

int cppc_set_auto_act_window(int cpu, u64 auto_act_window)

{

	return cppc_set_reg(cpu, AUTO_ACT_WINDOW, auto_act_window);

}

EXPORT_SYMBOL_GPL(cppc_set_auto_act_window);



/**

 * cppc_get_auto_act_window - Read autonomous act window register.

 * @cpu    : CPU to which to write register.

 * @enable : the desired value of autonomous act window register to be updated.

 */

int cppc_get_auto_act_window(int cpunum, u64 *auto_act_window)

{

	return cppc_get_reg(cpunum, AUTO_ACT_WINDOW, auto_act_window);

}

EXPORT_SYMBOL_GPL(cppc_get_auto_act_window);



/**

 * cppc_get_auto_sel - Read autonomous selection register.

 * @cpunum : CPU to which to write register.

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

 */

int cppc_get_auto_sel(int cpunum, u64 *auto_sel)

{

	return cppc_get_reg(cpunum, AUTO_SEL_ENABLE, auto_sel);

}

EXPORT_SYMBOL_GPL(cppc_get_auto_sel);





/**

 * 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)

{

	return cppc_set_reg(cpu, AUTO_SEL_ENABLE, enable);

}

EXPORT_SYMBOL_GPL(cppc_set_auto_sel);



/**

 * cppc_set_epp - Write energe perf register.

 * @cpu    : CPU to which to write register.

 * @enable : the desired value of energe perf register to be updated.

 */

int cppc_set_epp(int cpu, u64 epp_val)

{

	return cppc_set_reg(cpu, ENERGY_PERF, epp_val);

}

EXPORT_SYMBOL_GPL(cppc_set_epp);



/**

 * cppc_set_perf - Set a CPU's performance controls.

 * @cpu: CPU for which to set performance controls.

include/acpi/cppc_acpi.h

+6 −0
Original line number Diff line number Diff line
@@ -135,6 +135,12 @@ struct cppc_cpudata { 


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_get_epp_perf(int cpunum, u64 *epp_perf);

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

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_set_auto_sel(int cpu, bool enable);

extern int cppc_set_epp(int cpu, u64 epp_val);

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);

extern int acpi_get_psd_map(struct cppc_cpudata **);