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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - block/blk-mq-pci.c
2 * Copyright (c) 2016 Christoph Hellwig.
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.
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
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>
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.
25 * This function assumes the PCI device @pdev has at least as many available
26 * interrupt vectors as @set has queues. It will then query 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
31 int blk_mq_pci_map_queues(struct blk_mq_tag_set
*set
, struct pci_dev
*pdev
)
33 const struct cpumask
*mask
;
34 unsigned int queue
, cpu
;
36 for (queue
= 0; queue
< set
->nr_hw_queues
; queue
++) {
37 mask
= pci_irq_get_affinity(pdev
, queue
);
41 for_each_cpu(cpu
, mask
)
42 set
->mq_map
[cpu
] = queue
;
48 WARN_ON_ONCE(set
->nr_hw_queues
> 1);
49 for_each_possible_cpu(cpu
)
53 EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues
);