1 // SPDX-License-Identifier: GPL-2.0
3  * CPU <-> hardware queue mapping helpers
5  * Copyright (C) 2013-2014 Jens Axboe
12 #include <linux/cpu.h>
17 #include "blk-mq.h"
22 	unsigned int queue, cpu;  in blk_mq_map_queues()  local
24 	masks = group_cpus_evenly(qmap->nr_queues);  in blk_mq_map_queues()
26 		for_each_possible_cpu(cpu)  in blk_mq_map_queues()
27 			qmap->mq_map[cpu] = qmap->queue_offset;  in blk_mq_map_queues()
31 	for (queue = 0; queue < qmap->nr_queues; queue++) {  in blk_mq_map_queues()
32 		for_each_cpu(cpu, &masks[queue])  in blk_mq_map_queues()
33 			qmap->mq_map[cpu] = qmap->queue_offset + queue;  in blk_mq_map_queues()
40  * blk_mq_hw_queue_to_node - Look up the memory node for a hardware queue index
41  * @qmap: CPU to hardware queue map.
52 		if (index == qmap->mq_map[i])  in blk_mq_hw_queue_to_node()
60  * blk_mq_map_hw_queues - Create CPU to hardware queue mapping
61  * @qmap:	CPU to hardware queue map
63  * @offset:	Queue offset to use for the device
65  * Create a CPU to hardware queue mapping in @qmap. The struct bus_type
69 			  struct device *dev, unsigned int offset)  in blk_mq_map_hw_queues()  argument
73 	unsigned int queue, cpu;  in blk_mq_map_hw_queues()  local
75 	if (!dev->bus->irq_get_affinity)  in blk_mq_map_hw_queues()
78 	for (queue = 0; queue < qmap->nr_queues; queue++) {  in blk_mq_map_hw_queues()
79 		mask = dev->bus->irq_get_affinity(dev, queue + offset);  in blk_mq_map_hw_queues()
83 		for_each_cpu(cpu, mask)  in blk_mq_map_hw_queues()
84 			qmap->mq_map[cpu] = qmap->queue_offset + queue;  in blk_mq_map_hw_queues()