| Message ID | 20240806-isolcpus-io-queues-v3-3-da0eecfeaf8b@suse.de (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | honor isolcpus configuration | expand |
On Tue, Aug 06, 2024 at 02:06:35PM +0200, Daniel Wagner wrote: > From: Ming Lei <ming.lei@redhat.com> > > blk_mq_pci_map_queues and blk_mq_virtio_map_queues will create a CPU to > hardware queue mapping based on affinity information. These two > function share code which only differs on how the affinity information > is retrieved. Also there is the hisi_sas which open codes the same loop. > > Thus introduce a new helper function for creating these mappings which > takes an callback function for fetching the affinity mask. Also > introduce common helper function for PCI and virtio devices to retrieve > affinity masks. > > Signed-off-by: Ming Lei <ming.lei@redhat.com> > [dwagner: - removed fallback mapping > - added affintity helpers > - updated commit message] > Signed-off-by: Daniel Wagner <dwagner@suse.de> > --- > block/blk-mq-cpumap.c | 35 +++++++++++++++++++++++++++++++++++ > block/blk-mq-pci.c | 18 ++++++++++++++++++ > block/blk-mq-virtio.c | 19 +++++++++++++++++++ > include/linux/blk-mq-pci.h | 2 ++ > include/linux/blk-mq-virtio.h | 3 +++ > include/linux/blk-mq.h | 5 +++++ > 6 files changed, 82 insertions(+) > > diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c > index 9638b25fd521..7037a2dc485f 100644 > --- a/block/blk-mq-cpumap.c > +++ b/block/blk-mq-cpumap.c > @@ -54,3 +54,38 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index) > > return NUMA_NO_NODE; > } > + > +/** > + * blk_mq_dev_map_queues - Create CPU to hardware queue mapping > + * @qmap: CPU to hardware queue map. > + * @dev_off: Offset to use for the device. > + * @dev_data: Device data passed to get_queue_affinity(). > + * @get_queue_affinity: Callback to retrieve queue affinity. > + * > + * Create a CPU to hardware queue mapping in @qmap. For each queue > + * @get_queue_affinity will be called to retrieve the affinity for given > + * queue. > + */ > +void blk_mq_dev_map_queues(struct blk_mq_queue_map *qmap, > + void *dev_data, int dev_off, > + get_queue_affinty_fn *get_queue_affinity) > +{ > + const struct cpumask *mask; > + unsigned int queue, cpu; > + > + for (queue = 0; queue < qmap->nr_queues; queue++) { > + mask = get_queue_affinity(dev_data, dev_off, queue); > + 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_dev_map_queues); > diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c > index d47b5c73c9eb..71a73238aeb2 100644 > --- a/block/blk-mq-pci.c > +++ b/block/blk-mq-pci.c > @@ -44,3 +44,21 @@ void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev, > blk_mq_clear_mq_map(qmap); > } > EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); > + > +/** > + * blk_mq_pci_get_queue_affinity - get affinity mask queue mapping for PCI device > + * @dev_data: Pointer to struct pci_dev. > + * @offset: Offset to use for the pci irq vector > + * @queue: Queue index > + * > + * This function returns for a queue the affinity mask for a PCI device. > + * It is usually used as callback for blk_mq_dev_map_queues(). > + */ > +const struct cpumask *blk_mq_pci_get_queue_affinity(void *dev_data, int offset, > + int queue) > +{ > + struct pci_dev *pdev = dev_data; > + > + return pci_irq_get_affinity(pdev, offset + queue); > +} > +EXPORT_SYMBOL_GPL(blk_mq_pci_get_queue_affinity); > diff --git a/block/blk-mq-virtio.c b/block/blk-mq-virtio.c > index 68d0945c0b08..d3d33f8d69ce 100644 > --- a/block/blk-mq-virtio.c > +++ b/block/blk-mq-virtio.c > @@ -44,3 +44,22 @@ void blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap, > blk_mq_map_queues(qmap); > } > EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues); > + > +/** > + * blk_mq_virtio_get_queue_affinity - get affinity mask queue mapping for virtio device Please avoid the overly long line here. > +const struct cpumask *blk_mq_virtio_get_queue_affinity(void *dev_data, > + int offset, > + int queue) > +{ And maybe use sane formatting here: const struct cpumask *blk_mq_virtio_get_queue_affinity(void *dev_data, int offset, int queue) /me also wonders why the parameters aren't unsigned, but that's history..
On Tue, Aug 06, 2024 at 03:26:45PM GMT, Christoph Hellwig wrote: > > + > > +/** > > + * blk_mq_virtio_get_queue_affinity - get affinity mask queue mapping for virtio device > > Please avoid the overly long line here. I thought for some reason the brief description needs to be on one line. It can be multiple lines: https://www.kernel.org/doc/html/v6.10/doc-guide/kernel-doc.html#structure-union-and-enumeration-documentation
On Wed, Aug 07, 2024 at 02:49:58PM +0200, Daniel Wagner wrote: > On Tue, Aug 06, 2024 at 03:26:45PM GMT, Christoph Hellwig wrote: > > > + > > > +/** > > > + * blk_mq_virtio_get_queue_affinity - get affinity mask queue mapping for virtio device > > > > Please avoid the overly long line here. > > I thought for some reason the brief description needs to be on one > line. It can be multiple lines: > > https://www.kernel.org/doc/html/v6.10/doc-guide/kernel-doc.html#structure-union-and-enumeration-documentation I'm pretty sure I've see line wraps there. But if it wraps that's probably and argument it is too lone as it isn't single line at that point for a reasonable definition of line.
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index 9638b25fd521..7037a2dc485f 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -54,3 +54,38 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index) return NUMA_NO_NODE; } + +/** + * blk_mq_dev_map_queues - Create CPU to hardware queue mapping + * @qmap: CPU to hardware queue map. + * @dev_off: Offset to use for the device. + * @dev_data: Device data passed to get_queue_affinity(). + * @get_queue_affinity: Callback to retrieve queue affinity. + * + * Create a CPU to hardware queue mapping in @qmap. For each queue + * @get_queue_affinity will be called to retrieve the affinity for given + * queue. + */ +void blk_mq_dev_map_queues(struct blk_mq_queue_map *qmap, + void *dev_data, int dev_off, + get_queue_affinty_fn *get_queue_affinity) +{ + const struct cpumask *mask; + unsigned int queue, cpu; + + for (queue = 0; queue < qmap->nr_queues; queue++) { + mask = get_queue_affinity(dev_data, dev_off, queue); + 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_dev_map_queues); diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c index d47b5c73c9eb..71a73238aeb2 100644 --- a/block/blk-mq-pci.c +++ b/block/blk-mq-pci.c @@ -44,3 +44,21 @@ void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev, blk_mq_clear_mq_map(qmap); } EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); + +/** + * blk_mq_pci_get_queue_affinity - get affinity mask queue mapping for PCI device + * @dev_data: Pointer to struct pci_dev. + * @offset: Offset to use for the pci irq vector + * @queue: Queue index + * + * This function returns for a queue the affinity mask for a PCI device. + * It is usually used as callback for blk_mq_dev_map_queues(). + */ +const struct cpumask *blk_mq_pci_get_queue_affinity(void *dev_data, int offset, + int queue) +{ + struct pci_dev *pdev = dev_data; + + return pci_irq_get_affinity(pdev, offset + queue); +} +EXPORT_SYMBOL_GPL(blk_mq_pci_get_queue_affinity); diff --git a/block/blk-mq-virtio.c b/block/blk-mq-virtio.c index 68d0945c0b08..d3d33f8d69ce 100644 --- a/block/blk-mq-virtio.c +++ b/block/blk-mq-virtio.c @@ -44,3 +44,22 @@ void blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap, blk_mq_map_queues(qmap); } EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues); + +/** + * blk_mq_virtio_get_queue_affinity - get affinity mask queue mapping for virtio device + * @dev_data: Pointer to struct virtio_device. + * @offset: Offset to use for the virtio irq vector + * @queue: Queue index + * + * This function returns for a queue the affinity mask for a virtio device. + * It is usually used as callback for blk_mq_dev_map_queues(). + */ +const struct cpumask *blk_mq_virtio_get_queue_affinity(void *dev_data, + int offset, + int queue) +{ + struct virtio_device *vdev = dev_data; + + return virtio_get_vq_affinity(vdev, offset + queue); +} +EXPORT_SYMBOL_GPL(blk_mq_virtio_get_queue_affinity); diff --git a/include/linux/blk-mq-pci.h b/include/linux/blk-mq-pci.h index ca544e1d3508..2e701f6f6341 100644 --- a/include/linux/blk-mq-pci.h +++ b/include/linux/blk-mq-pci.h @@ -7,5 +7,7 @@ struct pci_dev; void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev, int offset); +const struct cpumask *blk_mq_pci_get_queue_affinity(void *dev_data, int offset, + int queue); #endif /* _LINUX_BLK_MQ_PCI_H */ diff --git a/include/linux/blk-mq-virtio.h b/include/linux/blk-mq-virtio.h index 13226e9b22dd..9d3273ba4abf 100644 --- a/include/linux/blk-mq-virtio.h +++ b/include/linux/blk-mq-virtio.h @@ -7,5 +7,8 @@ struct virtio_device; void blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap, struct virtio_device *vdev, int first_vec); +const struct cpumask *blk_mq_virtio_get_queue_affinity(void *dev_data, + int offset, + int queue); #endif /* _LINUX_BLK_MQ_VIRTIO_H */ diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 8d304b1d16b1..cfc96d6a3136 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -929,7 +929,12 @@ void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout); +typedef const struct cpumask *(get_queue_affinty_fn)(void *dev_data, + int dev_off, int queue_idx); void blk_mq_map_queues(struct blk_mq_queue_map *qmap); +void blk_mq_dev_map_queues(struct blk_mq_queue_map *qmap, + void *dev_data, int dev_off, + get_queue_affinty_fn *get_queue_affinity); void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); void blk_mq_quiesce_queue_nowait(struct request_queue *q);