path: root/block/blk-mq-pci.c
diff options
authorKeith Busch <>2018-03-27 09:39:06 -0600
committerJens Axboe <>2018-03-27 21:25:36 -0600
commitf23f5bece686a76598335141a091934f7eb0998c (patch)
treed523d0195bb2955637e5d607332029e7476b3e02 /block/blk-mq-pci.c
parent3148ffbdb9162baa28545809d675d3bf9339d6a1 (diff)
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 <> Cc: <> Cc: <> Signed-off-by: Keith Busch <> Reviewed-by: Ming Lei <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'block/blk-mq-pci.c')
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;