/*
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* Obtain energy cost data from DT and populate relevant scheduler data
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* structures.
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*
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* Copyright (C) 2015 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) "sched-energy: " fmt
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#define DEBUG
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#include <linux/gfp.h>
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#include <linux/of.h>
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#include <linux/printk.h>
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#include <linux/sched.h>
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#include <linux/sched_energy.h>
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#include <linux/stddef.h>
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struct sched_group_energy *sge_array[NR_CPUS][NR_SD_LEVELS];
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static void free_resources(void)
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{
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int cpu, sd_level;
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struct sched_group_energy *sge;
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for_each_possible_cpu(cpu) {
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for_each_possible_sd_level(sd_level) {
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sge = sge_array[cpu][sd_level];
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if (sge) {
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kfree(sge->cap_states);
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kfree(sge->idle_states);
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kfree(sge);
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}
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}
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}
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}
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void init_sched_energy_costs(void)
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{
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struct device_node *cn, *cp;
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struct capacity_state *cap_states;
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struct idle_state *idle_states;
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struct sched_group_energy *sge;
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const struct property *prop;
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int sd_level, i, nstates, cpu;
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const __be32 *val;
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for_each_possible_cpu(cpu) {
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cn = of_get_cpu_node(cpu, NULL);
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if (!cn) {
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pr_warn("CPU device node missing for CPU %d\n", cpu);
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return;
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}
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if (!of_find_property(cn, "sched-energy-costs", NULL)) {
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pr_warn("CPU device node has no sched-energy-costs\n");
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return;
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}
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for_each_possible_sd_level(sd_level) {
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cp = of_parse_phandle(cn, "sched-energy-costs", sd_level);
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if (!cp)
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break;
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prop = of_find_property(cp, "busy-cost-data", NULL);
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if (!prop || !prop->value) {
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pr_warn("No busy-cost data, skipping sched_energy init\n");
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goto out;
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}
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sge = kcalloc(1, sizeof(struct sched_group_energy),
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GFP_NOWAIT);
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nstates = (prop->length / sizeof(u32)) / 2;
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cap_states = kcalloc(nstates,
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sizeof(struct capacity_state),
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GFP_NOWAIT);
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for (i = 0, val = prop->value; i < nstates; i++) {
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cap_states[i].cap = be32_to_cpup(val++);
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cap_states[i].power = be32_to_cpup(val++);
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}
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sge->nr_cap_states = nstates;
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sge->cap_states = cap_states;
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prop = of_find_property(cp, "idle-cost-data", NULL);
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if (!prop || !prop->value) {
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pr_warn("No idle-cost data, skipping sched_energy init\n");
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goto out;
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}
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nstates = (prop->length / sizeof(u32));
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idle_states = kcalloc(nstates,
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sizeof(struct idle_state),
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GFP_NOWAIT);
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for (i = 0, val = prop->value; i < nstates; i++)
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idle_states[i].power = be32_to_cpup(val++);
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sge->nr_idle_states = nstates;
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sge->idle_states = idle_states;
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sge_array[cpu][sd_level] = sge;
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}
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}
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pr_info("Sched-energy-costs installed from DT\n");
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return;
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out:
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free_resources();
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}
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