This allows skipping the first N IRQ vectors in case they are used for
control or admin interrupts.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/blk-mq-pci.c | 6 ++++--
drivers/nvme/host/pci.c | 2 +-
include/linux/blk-mq-pci.h | 3 ++-
3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c
index 966c216..03ff7c4 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.
+ * @first_vec: first interrupt vectors to use for queues (usually 0)
*
* This function assumes the PCI device @pdev has at least as many available
* interrupt vetors as @set has queues. It will then queuery the vector
@@ -28,12 +29,13 @@
* 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 first_vec)
{
const struct cpumask *mask;
unsigned int queue, cpu;
- for (queue = 0; queue < set->nr_hw_queues; queue++) {
+ for (queue = first_vec; queue < set->nr_hw_queues; queue++) {
mask = pci_irq_get_affinity(pdev, queue);
if (!mask)
return -EINVAL;
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 0fc99f0..a05fbaf 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -272,7 +272,7 @@ static int nvme_pci_map_queues(struct blk_mq_tag_set *set)
{
struct nvme_dev *dev = set->driver_data;
- return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev));
+ return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev), 0);
}
/**
diff --git a/include/linux/blk-mq-pci.h b/include/linux/blk-mq-pci.h
index 6ab5952..fde26d2 100644
--- a/include/linux/blk-mq-pci.h
+++ b/include/linux/blk-mq-pci.h
@@ -4,6 +4,7 @@
struct blk_mq_tag_set;
struct pci_dev;
-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 first_vec);
#endif /* _LINUX_BLK_MQ_PCI_H */
--
2.1.4
--
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