blk-mq: fix two misuses on RQF_USE_SCHED
[linux-block.git] / block / blk-mq-cpumap.c
CommitLineData
3dcf60bc 1// SPDX-License-Identifier: GPL-2.0
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2/*
3 * CPU <-> hardware queue mapping helpers
4 *
5 * Copyright (C) 2013-2014 Jens Axboe
6 */
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7#include <linux/kernel.h>
8#include <linux/threads.h>
9#include <linux/module.h>
10#include <linux/mm.h>
11#include <linux/smp.h>
12#include <linux/cpu.h>
6a6dcae8 13#include <linux/group_cpus.h>
320ae51f 14
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15#include "blk.h"
16#include "blk-mq.h"
17
a4e1d0b7 18void blk_mq_map_queues(struct blk_mq_queue_map *qmap)
320ae51f 19{
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20 const struct cpumask *masks;
21 unsigned int queue, cpu;
22
23 masks = group_cpus_evenly(qmap->nr_queues);
24 if (!masks) {
25 for_each_possible_cpu(cpu)
26 qmap->mq_map[cpu] = qmap->queue_offset;
27 return;
556f36e9 28 }
320ae51f 29
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30 for (queue = 0; queue < qmap->nr_queues; queue++) {
31 for_each_cpu(cpu, &masks[queue])
32 qmap->mq_map[cpu] = qmap->queue_offset + queue;
320ae51f 33 }
6a6dcae8 34 kfree(masks);
320ae51f 35}
9e5a7e22 36EXPORT_SYMBOL_GPL(blk_mq_map_queues);
320ae51f 37
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38/**
39 * blk_mq_hw_queue_to_node - Look up the memory node for a hardware queue index
40 * @qmap: CPU to hardware queue map.
41 * @index: hardware queue index.
42 *
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43 * We have no quick way of doing reverse lookups. This is only used at
44 * queue init time, so runtime isn't important.
45 */
ed76e329 46int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index)
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47{
48 int i;
49
50 for_each_possible_cpu(i) {
ed76e329 51 if (index == qmap->mq_map[i])
576e85c5 52 return cpu_to_node(i);
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53 }
54
55 return NUMA_NO_NODE;
56}