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46 lines
1.3 KiB
46 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2016 Christoph Hellwig. |
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*/ |
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#include <linux/device.h> |
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#include <linux/blk-mq.h> |
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#include <linux/blk-mq-virtio.h> |
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#include <linux/virtio_config.h> |
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#include <linux/module.h> |
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#include "blk-mq.h" |
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/** |
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* blk_mq_virtio_map_queues - provide a default queue mapping for virtio device |
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* @qmap: CPU to hardware queue map. |
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* @vdev: virtio device to provide a mapping for. |
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* @first_vec: first interrupt vectors to use for queues (usually 0) |
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* |
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* This function assumes the virtio device @vdev has at least as many available |
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* interrupt vectors as @set has queues. It will then query the vector |
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* corresponding to each queue for it's affinity mask and built queue mapping |
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* that maps a queue to the CPUs that have irq affinity for the corresponding |
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* vector. |
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*/ |
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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) |
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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 (!vdev->config->get_vq_affinity) |
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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); |
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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 0; |
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fallback: |
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return blk_mq_map_queues(qmap); |
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} |
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EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues);
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