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Linux/block/blk-mq-pci.c

  1 /*
  2  * Copyright (c) 2016 Christoph Hellwig.
  3  *
  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.
  7  *
  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
 11  * more details.
 12  */
 13 #include <linux/kobject.h>
 14 #include <linux/blkdev.h>
 15 #include <linux/blk-mq.h>
 16 #include <linux/blk-mq-pci.h>
 17 #include <linux/pci.h>
 18 #include <linux/module.h>
 19 
 20 /**
 21  * blk_mq_pci_map_queues - provide a default queue mapping for PCI device
 22  * @set:        tagset to provide the mapping for
 23  * @pdev:       PCI device associated with @set.
 24  *
 25  * This function assumes the PCI device @pdev has at least as many available
 26  * interrupt vetors as @set has queues.  It will then queuery the vector
 27  * corresponding to each queue for it's affinity mask and built queue mapping
 28  * that maps a queue to the CPUs that have irq affinity for the corresponding
 29  * vector.
 30  */
 31 int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev)
 32 {
 33         const struct cpumask *mask;
 34         unsigned int queue, cpu;
 35 
 36         for (queue = 0; queue < set->nr_hw_queues; queue++) {
 37                 mask = pci_irq_get_affinity(pdev, queue);
 38                 if (!mask)
 39                         return -EINVAL;
 40 
 41                 for_each_cpu(cpu, mask)
 42                         set->mq_map[cpu] = queue;
 43         }
 44 
 45         return 0;
 46 }
 47 EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);
 48 

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