diff options
| author | Keith Busch <keith.busch@intel.com> | 2018-03-27 17:39:06 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-03-28 05:25:36 +0200 |
| commit | f23f5bece686a76598335141a091934f7eb0998c (patch) | |
| tree | d523d0195bb2955637e5d607332029e7476b3e02 /block/blk-mq-pci.c | |
| parent | loop: use killable lock in ioctls (diff) | |
| download | linux-f23f5bece686a76598335141a091934f7eb0998c.tar.xz linux-f23f5bece686a76598335141a091934f7eb0998c.zip | |
blk-mq: Allow PCI vector offset for mapping queues
The PCI interrupt vectors intended to be associated with a queue may
not start at 0; a driver may allocate pre_vectors for special use. This
patch adds an offset parameter so blk-mq may find the intended affinity
mask and updates all drivers using this API accordingly.
Cc: Don Brace <don.brace@microsemi.com>
Cc: <qla2xxx-upstream@qlogic.com>
Cc: <linux-scsi@vger.kernel.org>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-pci.c')
| -rw-r--r-- | block/blk-mq-pci.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c index 76944e3271bf..e233996bb76f 100644 --- a/block/blk-mq-pci.c +++ b/block/blk-mq-pci.c @@ -21,6 +21,7 @@ * blk_mq_pci_map_queues - provide a default queue mapping for PCI device * @set: tagset to provide the mapping for * @pdev: PCI device associated with @set. + * @offset: Offset to use for the pci irq vector * * This function assumes the PCI device @pdev has at least as many available * interrupt vectors as @set has queues. It will then query the vector @@ -28,13 +29,14 @@ * that maps a queue to the CPUs that have irq affinity for the corresponding * vector. */ -int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev) +int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev, + int offset) { const struct cpumask *mask; unsigned int queue, cpu; for (queue = 0; queue < set->nr_hw_queues; queue++) { - mask = pci_irq_get_affinity(pdev, queue); + mask = pci_irq_get_affinity(pdev, queue + offset); if (!mask) goto fallback; |