125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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* Copyright (C) 2012, Neil Horman <nhorman@tuxdriver.com>
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*
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* This file is part of irqbalance
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*
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* This program file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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 in a file named COPYING; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/*
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* This file contains the code to communicate a selected distribution / mapping
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* of interrupts to the kernel.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include "irqbalance.h"
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static int check_affinity(struct irq_info *info, cpumask_t applied_mask)
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{
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cpumask_t current_mask;
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char buf[PATH_MAX];
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char *line = NULL;
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size_t size = 0;
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FILE *file;
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sprintf(buf, "/proc/irq/%i/smp_affinity", info->irq);
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file = fopen(buf, "r");
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if (!file)
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return 1;
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if (getline(&line, &size, file)==0) {
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free(line);
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fclose(file);
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return 1;
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}
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cpumask_parse_user(line, strlen(line), current_mask);
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fclose(file);
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free(line);
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return cpus_equal(applied_mask, current_mask);
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}
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static void activate_mapping(struct irq_info *info, void *data __attribute__((unused)))
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{
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char buf[PATH_MAX];
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FILE *file;
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cpumask_t applied_mask;
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int valid_mask = 0;
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/*
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* only activate mappings for irqs that have moved
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*/
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if (!info->moved)
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return;
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if ((info->hint_policy == HINT_POLICY_EXACT) &&
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(!cpus_empty(info->affinity_hint))) {
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if (cpus_intersects(info->affinity_hint, banned_cpus))
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log(TO_ALL, LOG_WARNING,
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"irq %d affinity_hint and banned cpus confict\n",
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info->irq);
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else {
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applied_mask = info->affinity_hint;
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valid_mask = 1;
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}
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} else if (info->assigned_obj) {
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applied_mask = info->assigned_obj->mask;
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if ((info->hint_policy == HINT_POLICY_SUBSET) &&
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(!cpus_empty(info->affinity_hint))) {
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cpus_and(applied_mask, applied_mask, info->affinity_hint);
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if (!cpus_intersects(applied_mask, unbanned_cpus)) {
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if (!info->warned) {
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info->warned = 1;
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log(TO_ALL, LOG_WARNING,
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"irq %d affinity_hint subset empty\n",
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info->irq);
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}
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} else
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valid_mask = 1;
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} else {
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valid_mask = 1;
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}
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}
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/*
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* Don't activate anything for which we have an invalid mask
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*/
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if (!valid_mask || check_affinity(info, applied_mask))
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return;
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if (!info->assigned_obj)
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return;
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sprintf(buf, "/proc/irq/%i/smp_affinity", info->irq);
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file = fopen(buf, "w");
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if (!file)
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return;
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cpumask_scnprintf(buf, PATH_MAX, applied_mask);
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fprintf(file, "%s", buf);
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fclose(file);
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info->moved = 0; /*migration is done*/
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}
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void activate_mappings(void)
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{
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for_each_irq(NULL, activate_mapping, NULL);
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}
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