d2b3db032e
This patch implements support for extracting energy cost data from DT. The data should conform to the DT bindings for energy cost data needed by EAS (energy aware scheduling). Signed-off-by: Robin Randhawa <robin.randhawa@arm.com>
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
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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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