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48 lines
1.3 KiB
48 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/kobject.h> |
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#include <linux/blkdev.h> |
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#include <linux/blk-mq.h> |
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#include <linux/blk-mq-pci.h> |
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#include <linux/pci.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_pci_map_queues - provide a default queue mapping for PCI device |
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* @qmap: CPU to hardware queue map. |
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* @pdev: PCI device associated with @set. |
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* @offset: Offset to use for the pci irq vector |
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* |
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* This function assumes the PCI device @pdev 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_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev, |
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int offset) |
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{ |
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const struct cpumask *mask; |
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unsigned int queue, cpu; |
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for (queue = 0; queue < qmap->nr_queues; queue++) { |
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mask = pci_irq_get_affinity(pdev, queue + offset); |
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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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WARN_ON_ONCE(qmap->nr_queues > 1); |
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blk_mq_clear_mq_map(qmap); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);
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