1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * Copyright (c) 2016 Christoph Hellwig. 2 * Copyright (c) 2016 Christoph Hellwig.
>> 3 *
>> 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.
>> 7 *
>> 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
>> 11 * more details.
4 */ 12 */
5 #include <linux/kobject.h> 13 #include <linux/kobject.h>
6 #include <linux/blkdev.h> 14 #include <linux/blkdev.h>
>> 15 #include <linux/blk-mq.h>
7 #include <linux/blk-mq-pci.h> 16 #include <linux/blk-mq-pci.h>
8 #include <linux/pci.h> 17 #include <linux/pci.h>
9 #include <linux/module.h> 18 #include <linux/module.h>
10 19
11 #include "blk-mq.h" <<
12 <<
13 /** 20 /**
14 * blk_mq_pci_map_queues - provide a default q 21 * blk_mq_pci_map_queues - provide a default queue mapping for PCI device
15 * @qmap: CPU to hardware queue map. !! 22 * @set: tagset to provide the mapping for
16 * @pdev: PCI device associated with @se 23 * @pdev: PCI device associated with @set.
17 * @offset: Offset to use for the pci irq <<
18 * 24 *
19 * This function assumes the PCI device @pdev 25 * This function assumes the PCI device @pdev has at least as many available
20 * interrupt vectors as @set has queues. It w !! 26 * interrupt vetors as @set has queues. It will then queuery the vector
21 * corresponding to each queue for it's affini 27 * corresponding to each queue for it's affinity mask and built queue mapping
22 * that maps a queue to the CPUs that have irq 28 * that maps a queue to the CPUs that have irq affinity for the corresponding
23 * vector. 29 * vector.
24 */ 30 */
25 void blk_mq_pci_map_queues(struct blk_mq_queue !! 31 int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev)
26 int offset) <<
27 { 32 {
28 const struct cpumask *mask; 33 const struct cpumask *mask;
29 unsigned int queue, cpu; 34 unsigned int queue, cpu;
30 35
31 for (queue = 0; queue < qmap->nr_queue !! 36 for (queue = 0; queue < set->nr_hw_queues; queue++) {
32 mask = pci_irq_get_affinity(pd !! 37 mask = pci_irq_get_affinity(pdev, queue);
33 if (!mask) 38 if (!mask)
34 goto fallback; !! 39 return -EINVAL;
35 40
36 for_each_cpu(cpu, mask) 41 for_each_cpu(cpu, mask)
37 qmap->mq_map[cpu] = qm !! 42 set->mq_map[cpu] = queue;
38 } 43 }
39 44
40 return; !! 45 return 0;
41 <<
42 fallback: <<
43 WARN_ON_ONCE(qmap->nr_queues > 1); <<
44 blk_mq_clear_mq_map(qmap); <<
45 } 46 }
46 EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); 47 EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);
47 48
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