Messages in this thread Patch in this message | | | From | Lukasz Luba <> | Subject | [PATCH v3 04/12] PM: EM: Refactor a new function em_compute_costs() | Date | Fri, 21 Jul 2023 16:50:14 +0100 |
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Refactor a dedicated function which will be easier to maintain and re-use in future. The upcoming changes for the modifiable EM perf_state table will use it (instead of duplicating the code).
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- kernel/power/energy_model.c | 72 ++++++++++++++++++++++--------------- 1 file changed, 43 insertions(+), 29 deletions(-)
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 85a70b7da023..fd1066dcf38b 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -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; -- 2.25.1
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