[PATCH v2 0/6] blk: refactor queue affinity helpers

[Daniel Wagner <wagi@kernel.org>]

As Christoph suggested, I introduced a new callback to struct bus_type
and hooked up the callbacks directly in virtio and pci subsystem. This
looks pretty neat!

I've decided to provide only one version of blk_mq_hctx_map_queues but
with an additional argument to pass in a driver specific callback.

Currently, there is only one user of this additional callback. Maybe it
would be better to provide an variant of blk_mq_hctx_map_queues for the
additional argument. Not sure though. Thoughts?

Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
Changes in v2:
- added new callback to struct bus_type and call directly the affinity
  helpers from there.
- Link to v1: https://lore.kernel.org/r/20240913-refactor-blk-affinity-helpers-v1-0-8e058f77af12@suse.de

Changes in v1:
- renamed blk_mq_dev_map_queues to blk_mq_hctx_map_queues
- squased 'virito: add APIs for retrieving vq affinity' into
  'blk-mq: introduce blk_mq_hctx_map_queues'
- moved hisi_sas changed into a new patch
- hisi_sas use define instead of hard coded value
- moved helpers into their matching subsystem, removed
  blk-mq-pci and blk-mq-virtio files
- fix spelling/typos
- fixed long lines in docu (yep new lines in brief descriptions are
  supported, tested ti)
- based on the first part of
  https://lore.kernel.org/all/20240806-isolcpus-io-queues-v3-0-da0eecfeaf8b@suse.de

---
Daniel Wagner (6):
      blk-mq: introduce blk_mq_hctx_map_queues
      scsi: replace blk_mq_pci_map_queues with blk_mq_hctx_map_queues
      scsi: hisi_sas: replace blk_mq_pci_map_queues with blk_mq_hctx_map_queues
      nvme: replace blk_mq_pci_map_queues with blk_mq_hctx_map_queues
      virtio: blk/scsi: replace blk_mq_virtio_map_queues with blk_mq_hctx_map_queues
      blk-mq: remove unused queue mapping helpers

 block/Makefile                            |  2 --
 block/blk-mq-cpumap.c                     | 40 +++++++++++++++++++++++++++
 block/blk-mq-pci.c                        | 46 -------------------------------
 block/blk-mq-virtio.c                     | 46 -------------------------------
 drivers/block/virtio_blk.c                |  4 +--
 drivers/nvme/host/fc.c                    |  1 -
 drivers/nvme/host/pci.c                   |  3 +-
 drivers/pci/pci-driver.c                  | 16 +++++++++++
 drivers/scsi/fnic/fnic_main.c             |  3 +-
 drivers/scsi/hisi_sas/hisi_sas.h          |  1 -
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c    | 22 +++++++--------
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c    |  4 +--
 drivers/scsi/megaraid/megaraid_sas_base.c |  3 +-
 drivers/scsi/mpi3mr/mpi3mr.h              |  1 -
 drivers/scsi/mpi3mr/mpi3mr_os.c           |  3 +-
 drivers/scsi/mpt3sas/mpt3sas_scsih.c      |  4 +--
 drivers/scsi/pm8001/pm8001_init.c         |  2 +-
 drivers/scsi/pm8001/pm8001_sas.h          |  1 -
 drivers/scsi/qla2xxx/qla_nvme.c           |  4 +--
 drivers/scsi/qla2xxx/qla_os.c             |  4 +--
 drivers/scsi/smartpqi/smartpqi_init.c     |  7 ++---
 drivers/scsi/virtio_scsi.c                |  3 +-
 drivers/virtio/virtio.c                   | 12 ++++++++
 include/linux/blk-mq-pci.h                | 11 --------
 include/linux/blk-mq-virtio.h             | 11 --------
 include/linux/blk-mq.h                    |  5 ++++
 include/linux/device/bus.h                |  3 ++
 27 files changed, 107 insertions(+), 155 deletions(-)
---
base-commit: c9af98a7e8af266bae73e9d662b8341da1ec5824
change-id: 20240912-refactor-blk-affinity-helpers-7089b95b4b10

Best regards,
-- 
Daniel Wagner <wagi@kernel.org>