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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: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Quentin Perret 2018-09-10 17:28:10 +01:00 committed by Sudeep Holla
parent ca64b719a1
commit 1a63fe9a2b
2 changed files with 32 additions and 0 deletions
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28
drivers/firmware/arm_scmi/perf.c
View File

@ -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)

4
include/linux/scmi_protocol.h
View File

@ -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);
};
/**