/* * Copyright (c) 2016 Christoph Hellwig. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ #include <linux/device.h> #include <linux/blk-mq.h> #include <linux/blk-mq-virtio.h> #include <linux/virtio_config.h> #include <linux/module.h> #include "blk-mq.h" /** * blk_mq_virtio_map_queues - provide a default queue mapping for virtio device * @set: tagset to provide the mapping for * @vdev: virtio device associated with @set. * @first_vec: first interrupt vectors to use for queues (usually 0) * * This function assumes the virtio device @vdev has at least as many available * interrupt vetors as @set has queues. It will then queuery the vector * corresponding to each queue for it's affinity mask and built queue mapping * that maps a queue to the CPUs that have irq affinity for the corresponding * vector. */
int blk_mq_virtio_map_queues(struct blk_mq_tag_set *set, struct virtio_device *vdev, int first_vec) { const struct cpumask *mask; unsigned int queue, cpu; if (!vdev->config->get_vq_affinity) goto fallback; for (queue = 0; queue < set->nr_hw_queues; queue++) { mask = vdev->config->get_vq_affinity(vdev, first_vec + queue); if (!mask) goto fallback; for_each_cpu(cpu, mask) set->mq_map[cpu] = queue; } return 0; fallback: return blk_mq_map_queues(set); }Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christoph Hellwig | 108 | 100.00% | 1 | 100.00% |
| Total | 108 | 100.00% | 1 | 100.00% |
| Person | Tokens | Prop | Commits | CommitProp |
| Christoph Hellwig | 133 | 100.00% | 1 | 100.00% |
| Total | 133 | 100.00% | 1 | 100.00% |