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Linux/block/blk-mq-pci.c

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Diff markup

Differences between /block/blk-mq-pci.c (Architecture sparc) and /block/blk-mq-pci.c (Architecture m68k)


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

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