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Commit 1757d05f authored by Xiongfeng Wang's avatar Xiongfeng Wang Committed by Rafael J. Wysocki
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ACPI / CPPC: Add a helper to get desired performance 



This patch add a helper to get the value of desired performance
register.

Signed-off-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
[ rjw: More white space ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a9a22b57

drivers/acpi/cppc_acpi.c

+42 −0
Original line number Diff line number Diff line
@@ -1050,6 +1050,48 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) 
	return ret_val;

}



/**

 * cppc_get_desired_perf - Get the value of desired performance register.

 * @cpunum: CPU from which to get desired performance.

 * @desired_perf: address of a variable to store the returned desired performance

 *

 * Return: 0 for success, -EIO otherwise.

 */

int cppc_get_desired_perf(int cpunum, u64 *desired_perf)

{

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

	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);

	struct cpc_register_resource *desired_reg;

	struct cppc_pcc_data *pcc_ss_data = NULL;



	desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF];



	if (CPC_IN_PCC(desired_reg)) {

		int ret = 0;



		if (pcc_ss_id < 0)

			return -EIO;



		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, desired_reg, desired_perf);

		else

			ret = -EIO;



		up_write(&pcc_ss_data->pcc_lock);



		return ret;

	}



	cpc_read(cpunum, desired_reg, desired_perf);



	return 0;

}

EXPORT_SYMBOL_GPL(cppc_get_desired_perf);



/**

 * cppc_get_perf_caps - Get a CPUs performance capabilities.

 * @cpunum: CPU from which to get capabilities info.

include/acpi/cppc_acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -137,6 +137,7 @@ struct cppc_cpudata { 
	cpumask_var_t shared_cpu_map;

};



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_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);

extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);