Commit 1a63fe9a authored by Quentin Perret's avatar Quentin Perret Committed by Sudeep Holla
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firmware: arm_scmi: add a getter for power of performance states 



The SCMI protocol can be used to get power estimates from firmware
corresponding to each performance state of a device. Although these power
costs are already managed by the SCMI firmware driver, they are not
exposed to any external subsystem yet.

Fix this by adding a new get_power() interface to the exisiting perf_ops
defined for the SCMI protocol.

Signed-off-by: default avatarQuentin Perret <quentin.perret@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent ca64b719

drivers/firmware/arm_scmi/perf.c

+28 −0
Original line number Diff line number Diff line
@@ -427,6 +427,33 @@ static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain, 
	return ret;

}



static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain,

				   unsigned long *freq, unsigned long *power)

{

	struct scmi_perf_info *pi = handle->perf_priv;

	struct perf_dom_info *dom;

	unsigned long opp_freq;

	int idx, ret = -EINVAL;

	struct scmi_opp *opp;



	dom = pi->dom_info + domain;

	if (!dom)

		return -EIO;



	for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {

		opp_freq = opp->perf * dom->mult_factor;

		if (opp_freq < *freq)

			continue;



		*freq = opp_freq;

		*power = opp->power;

		ret = 0;

		break;

	}



	return ret;

}



static struct scmi_perf_ops perf_ops = {

	.limits_set = scmi_perf_limits_set,

	.limits_get = scmi_perf_limits_get,
@@ -437,6 +464,7 @@ static struct scmi_perf_ops perf_ops = { 
	.device_opps_add = scmi_dvfs_device_opps_add,

	.freq_set = scmi_dvfs_freq_set,

	.freq_get = scmi_dvfs_freq_get,

	.est_power_get = scmi_dvfs_est_power_get,

};



static int scmi_perf_protocol_init(struct scmi_handle *handle)

include/linux/scmi_protocol.h

+4 −0
Original line number Diff line number Diff line
@@ -91,6 +91,8 @@ struct scmi_clk_ops { 
 *	to sustained performance level mapping

 * @freq_get: gets the frequency for a given device using sustained frequency

 *	to sustained performance level mapping

 * @est_power_get: gets the estimated power cost for a given performance domain

 *	at a given frequency

 */

struct scmi_perf_ops {

	int (*limits_set)(const struct scmi_handle *handle, u32 domain,
@@ -110,6 +112,8 @@ struct scmi_perf_ops { 
			unsigned long rate, bool poll);

	int (*freq_get)(const struct scmi_handle *handle, u32 domain,

			unsigned long *rate, bool poll);

	int (*est_power_get)(const struct scmi_handle *handle, u32 domain,

			     unsigned long *rate, unsigned long *power);

};



/**

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