]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - block/blk-mq-virtio.c
2 * Copyright (c) 2016 Christoph Hellwig.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 #include <linux/device.h>
14 #include <linux/blk-mq.h>
15 #include <linux/blk-mq-virtio.h>
16 #include <linux/virtio_config.h>
17 #include <linux/module.h>
21 * blk_mq_virtio_map_queues - provide a default queue mapping for virtio device
22 * @set: tagset to provide the mapping for
23 * @vdev: virtio device associated with @set.
24 * @first_vec: first interrupt vectors to use for queues (usually 0)
26 * This function assumes the virtio device @vdev has at least as many available
27 * interrupt vetors as @set has queues. It will then queuery the vector
28 * corresponding to each queue for it's affinity mask and built queue mapping
29 * that maps a queue to the CPUs that have irq affinity for the corresponding
32 int blk_mq_virtio_map_queues(struct blk_mq_queue_map
*qmap
,
33 struct virtio_device
*vdev
, int first_vec
)
35 const struct cpumask
*mask
;
36 unsigned int queue
, cpu
;
38 if (!vdev
->config
->get_vq_affinity
)
41 for (queue
= 0; queue
< qmap
->nr_queues
; queue
++) {
42 mask
= vdev
->config
->get_vq_affinity(vdev
, first_vec
+ queue
);
46 for_each_cpu(cpu
, mask
)
47 qmap
->mq_map
[cpu
] = qmap
->queue_offset
+ queue
;
52 return blk_mq_map_queues(qmap
);
54 EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues
);