cregit-Linux how code gets into the kernel

Release 4.14 block/blk-mq-pci.c

Directory: block
/*
 * 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/kobject.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/blk-mq-pci.h>
#include <linux/pci.h>
#include <linux/module.h>

/**
 * blk_mq_pci_map_queues - provide a default queue mapping for PCI device
 * @set:        tagset to provide the mapping for
 * @pdev:       PCI device associated with @set.
 *
 * This function assumes the PCI device @pdev has at least as many available
 * interrupt vectors as @set has queues.  It will then query 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_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev) { const struct cpumask *mask; unsigned int queue, cpu; for (queue = 0; queue < set->nr_hw_queues; queue++) { mask = pci_irq_get_affinity(pdev, queue); if (!mask) goto fallback; for_each_cpu(cpu, mask) set->mq_map[cpu] = queue; } return 0; fallback: WARN_ON_ONCE(set->nr_hw_queues > 1); for_each_possible_cpu(cpu) set->mq_map[cpu] = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig106100.00%2100.00%
Total106100.00%2100.00%

EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);

Overall Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig12494.66%250.00%
Stephen Rothwell64.58%125.00%
Sagi Grimberg10.76%125.00%
Total131100.00%4100.00%
Directory: block
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