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block/blk-mq-virtio.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * Copyright (c) 2016 Christoph Hellwig. |
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*/ #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 |
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* @qmap: CPU to hardware queue map. * @vdev: virtio device to provide a mapping for. |
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* @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. */ |
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int blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap, |
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struct virtio_device *vdev, int first_vec) { const struct cpumask *mask; unsigned int queue, cpu; if (!vdev->config->get_vq_affinity) goto fallback; |
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for (queue = 0; queue < qmap->nr_queues; queue++) { |
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mask = vdev->config->get_vq_affinity(vdev, first_vec + queue); if (!mask) goto fallback; for_each_cpu(cpu, mask) |
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qmap->mq_map[cpu] = qmap->queue_offset + queue; |
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} return 0; fallback: |
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return blk_mq_map_queues(qmap); |
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} EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues); |