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PM: EM: Fix inefficient states detection

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[ Upstream commit aa1a43262ad5df010768f69530fa179ff81651d3 ]

Currently, a debug message is printed if an inefficient state is detected
in the Energy Model. Unfortunately, it won't detect if the first state is
inefficient or if two successive states are. Fix this behavior.

Fixes: 27871f7a8a (PM: Introduce an Energy Model management framework)
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vincent Donnefort 2021-09-08 15:05:22 +01:00 committed by Greg Kroah-Hartman
parent d01e847d84
commit 1b2d422a26
1 changed files with 8 additions and 15 deletions
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23
kernel/power/energy_model.c
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@ -94,8 +94,7 @@ static void em_debug_remove_pd(struct device *dev) {}
static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
int nr_states, struct em_data_callback *cb)
{
unsigned long opp_eff, prev_opp_eff = ULONG_MAX;
unsigned long power, freq, prev_freq = 0;
unsigned long power, freq, prev_freq = 0, prev_cost = ULONG_MAX;
struct em_perf_state *table;
int i, ret;
u64 fmax;
@ -140,27 +139,21 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
table[i].power = power;
table[i].frequency = prev_freq = freq;
/*
* The hertz/watts efficiency ratio should decrease as the
* frequency grows on sane platforms. But this isn't always
* true in practice so warn the user if a higher OPP is more
* power efficient than a lower one.
*/
opp_eff = freq / power;
if (opp_eff >= prev_opp_eff)
dev_dbg(dev, "EM: hertz/watts ratio non-monotonically decreasing: em_perf_state %d >= em_perf_state%d\n",
i, i - 1);
prev_opp_eff = opp_eff;
}
/* Compute the cost of each performance state. */
fmax = (u64) table[nr_states - 1].frequency;
for (i = 0; i < nr_states; i++) {
for (i = nr_states - 1; i >= 0; i--) {
unsigned long power_res = em_scale_power(table[i].power);
table[i].cost = div64_u64(fmax * power_res,
table[i].frequency);
if (table[i].cost >= prev_cost) {
dev_dbg(dev, "EM: OPP:%lu is inefficient\n",
table[i].frequency);
} else {
prev_cost = table[i].cost;
}
}
pd->table = table;