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PM: EM: Introduce em_compute_costs()

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Move the EM costs computation code into a new dedicated function,
em_compute_costs(), that can be reused in other places in the future.

This change is not expected to alter the general functionality.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2024-02-08 11:55:39 +00:00 committed by Rafael J. Wysocki
parent a3c78778f5
commit faf7075b79
1 changed files with 43 additions and 29 deletions
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72
kernel/power/energy_model.c
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@ -103,14 +103,52 @@ static void em_debug_create_pd(struct device *dev) {}
static void em_debug_remove_pd(struct device *dev) {}
#endif
static int em_compute_costs(struct device *dev, struct em_perf_state *table,
struct em_data_callback *cb, int nr_states,
unsigned long flags)
{
unsigned long prev_cost = ULONG_MAX;
u64 fmax;
int i, ret;
/* Compute the cost of each performance state. */
fmax = (u64) table[nr_states - 1].frequency;
for (i = nr_states - 1; i >= 0; i--) {
unsigned long power_res, cost;
if (flags & EM_PERF_DOMAIN_ARTIFICIAL) {
ret = cb->get_cost(dev, table[i].frequency, &cost);
if (ret || !cost || cost > EM_MAX_POWER) {
dev_err(dev, "EM: invalid cost %lu %d\n",
cost, ret);
return -EINVAL;
}
} else {
power_res = table[i].power;
cost = div64_u64(fmax * power_res, table[i].frequency);
}
table[i].cost = cost;
if (table[i].cost >= prev_cost) {
table[i].flags = EM_PERF_STATE_INEFFICIENT;
dev_dbg(dev, "EM: OPP:%lu is inefficient\n",
table[i].frequency);
} else {
prev_cost = table[i].cost;
}
}
return 0;
}
static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
int nr_states, struct em_data_callback *cb,
unsigned long flags)
{
unsigned long power, freq, prev_freq = 0, prev_cost = ULONG_MAX;
unsigned long power, freq, prev_freq = 0;
struct em_perf_state *table;
int i, ret;
u64 fmax;
table = kcalloc(nr_states, sizeof(*table), GFP_KERNEL);
if (!table)
@ -154,33 +192,9 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
table[i].frequency = prev_freq = freq;
}
/* Compute the cost of each performance state. */
fmax = (u64) table[nr_states - 1].frequency;
for (i = nr_states - 1; i >= 0; i--) {
unsigned long power_res, cost;
if (flags & EM_PERF_DOMAIN_ARTIFICIAL) {
ret = cb->get_cost(dev, table[i].frequency, &cost);
if (ret || !cost || cost > EM_MAX_POWER) {
dev_err(dev, "EM: invalid cost %lu %d\n",
cost, ret);
goto free_ps_table;
}
} else {
power_res = table[i].power;
cost = div64_u64(fmax * power_res, table[i].frequency);
}
table[i].cost = cost;
if (table[i].cost >= prev_cost) {
table[i].flags = EM_PERF_STATE_INEFFICIENT;
dev_dbg(dev, "EM: OPP:%lu is inefficient\n",
table[i].frequency);
} else {
prev_cost = table[i].cost;
}
}
ret = em_compute_costs(dev, table, cb, nr_states, flags);
if (ret)
goto free_ps_table;
pd->table = table;
pd->nr_perf_states = nr_states;