UPSTREAM: blk-mq: introduce blk_mq_map_hw_queues

[ Upstream commit 1452e9b4 ]

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 common code and only differ on how the affinity information is
retrieved. Also, those functions are located in the block subsystem
where it doesn't really fit in. They are virtio and pci subsystem
specific.

Thus introduce provide a generic mapping function which uses the
irq_get_affinity callback from bus_type.

Originally idea from Ming Lei <ming.lei@redhat.com>

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Change-Id: I1ed5cd7f652d6b487822400bcf6cc7b83779c645
Signed-off-by: Daniel Wagner <wagi@kernel.org>
Link: https://lore.kernel.org/r/20241202-refactor-blk-affinity-helpers-v6-4-27211e9c2cd5@kernel.org


Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: a2d5a007 ("scsi: smartpqi: Use is_kdump_kernel() to check for kdump")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit fe2bdefe)
Bug: 437846539
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>