blob: b595a94c4d16bb93b5dc61c7880534c1ef5a528e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
* Copyright (c) 2016 Christoph Hellwig.
#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>
#include "blk-mq.h"
* blk_mq_pci_map_queues - provide a default queue mapping for PCI device
* @qmap: CPU to hardware queue map.
* @pdev: PCI device associated with @set.
* @offset: Offset to use for the pci irq vector
* 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_queue_map *qmap, struct pci_dev *pdev,
int offset)
const struct cpumask *mask;
unsigned int queue, cpu;
for (queue = 0; queue < qmap->nr_queues; queue++) {
mask = pci_irq_get_affinity(pdev, queue + offset);
if (!mask)
goto fallback;
for_each_cpu(cpu, mask)
qmap->mq_map[cpu] = qmap->queue_offset + queue;
return 0;
WARN_ON_ONCE(qmap->nr_queues > 1);
return 0;