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8c16567d 1// SPDX-License-Identifier: GPL-2.0
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2/*
3 * Copyright (c) 2016 Christoph Hellwig.
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4 */
5#include <linux/device.h>
6#include <linux/blk-mq.h>
7#include <linux/blk-mq-virtio.h>
8#include <linux/virtio_config.h>
9#include <linux/module.h>
10#include "blk-mq.h"
11
12/**
13 * blk_mq_virtio_map_queues - provide a default queue mapping for virtio device
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BVA
14 * @qmap: CPU to hardware queue map.
15 * @vdev: virtio device to provide a mapping for.
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16 * @first_vec: first interrupt vectors to use for queues (usually 0)
17 *
18 * This function assumes the virtio device @vdev has at least as many available
7901b6e4 19 * interrupt vectors as @set has queues. It will then query the vector
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20 * corresponding to each queue for it's affinity mask and built queue mapping
21 * that maps a queue to the CPUs that have irq affinity for the corresponding
22 * vector.
23 */
ed76e329 24int blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap,
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25 struct virtio_device *vdev, int first_vec)
26{
27 const struct cpumask *mask;
28 unsigned int queue, cpu;
29
30 if (!vdev->config->get_vq_affinity)
31 goto fallback;
32
ed76e329 33 for (queue = 0; queue < qmap->nr_queues; queue++) {
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34 mask = vdev->config->get_vq_affinity(vdev, first_vec + queue);
35 if (!mask)
36 goto fallback;
37
38 for_each_cpu(cpu, mask)
843477d4 39 qmap->mq_map[cpu] = qmap->queue_offset + queue;
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40 }
41
42 return 0;
43fallback:
ed76e329 44 return blk_mq_map_queues(qmap);
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45}
46EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues);