Greg Kroah-Hartman
939565a79b
Link: https://lore.kernel.org/r/20260121181411.452263583@linuxfoundation.org Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Shuah Khan <skhan@linuxfoundation.org> Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Shung-Hsi Yu <shung-hsi.yu@suse.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Brett Mastbergen <bmastbergen@ciq.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CPU <-> hardware queue mapping helpers
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*
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* Copyright (C) 2013-2014 Jens Axboe
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*/
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <linux/group_cpus.h>
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#include <linux/device/bus.h>
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#include "blk.h"
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#include "blk-mq.h"
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void blk_mq_map_queues(struct blk_mq_queue_map *qmap)
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{
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const struct cpumask *masks;
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unsigned int queue, cpu;
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masks = group_cpus_evenly(qmap->nr_queues);
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if (!masks) {
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for_each_possible_cpu(cpu)
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qmap->mq_map[cpu] = qmap->queue_offset;
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return;
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}
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for (queue = 0; queue < qmap->nr_queues; queue++) {
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for_each_cpu(cpu, &masks[queue])
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qmap->mq_map[cpu] = qmap->queue_offset + queue;
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}
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kfree(masks);
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}
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EXPORT_SYMBOL_GPL(blk_mq_map_queues);
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/**
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* blk_mq_hw_queue_to_node - Look up the memory node for a hardware queue index
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* @qmap: CPU to hardware queue map.
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* @index: hardware queue index.
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*
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* We have no quick way of doing reverse lookups. This is only used at
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* queue init time, so runtime isn't important.
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*/
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int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index)
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{
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int i;
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for_each_possible_cpu(i) {
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if (index == qmap->mq_map[i])
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return cpu_to_node(i);
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}
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return NUMA_NO_NODE;
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}
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/**
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* blk_mq_map_hw_queues - Create CPU to hardware queue mapping
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* @qmap: CPU to hardware queue map
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* @dev: The device to map queues
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* @offset: Queue offset to use for the device
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*
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* Create a CPU to hardware queue mapping in @qmap. The struct bus_type
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* irq_get_affinity callback will be used to retrieve the affinity.
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*/
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void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap,
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struct device *dev, unsigned int offset)
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{
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const struct cpumask *mask;
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unsigned int queue, cpu;
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if (!dev->bus->irq_get_affinity)
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goto fallback;
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for (queue = 0; queue < qmap->nr_queues; queue++) {
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mask = dev->bus->irq_get_affinity(dev, queue + offset);
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if (!mask)
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goto fallback;
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for_each_cpu(cpu, mask)
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qmap->mq_map[cpu] = qmap->queue_offset + queue;
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}
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return;
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fallback:
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blk_mq_map_queues(qmap);
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}
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EXPORT_SYMBOL_GPL(blk_mq_map_hw_queues);
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