mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
a4e1d0b76e
Since blk_mq_map_queues() and the .map_queues() callbacks always return 0, change their return type into void. Most callers ignore the returned value anyway. Cc: Christoph Hellwig <hch@lst.de> Cc: Jason Wang <jasowang@redhat.com> Cc: Keith Busch <kbusch@kernel.org> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: John Garry <john.garry@huawei.com> Acked-by: Md Haris Iqbal <haris.iqbal@ionos.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Link: https://lore.kernel.org/r/20220815170043.19489-3-bvanassche@acm.org [axboe: fold in fix from Bart] Signed-off-by: Jens Axboe <axboe@kernel.dk>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
// 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.
|
|
*/
|
|
void 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;
|
|
|
|
fallback:
|
|
WARN_ON_ONCE(qmap->nr_queues > 1);
|
|
blk_mq_clear_mq_map(qmap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);
|