From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- block/blk-mq-pci.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 block/blk-mq-pci.c (limited to 'block/blk-mq-pci.c') diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c new file mode 100644 index 000000000..d47b5c73c --- /dev/null +++ b/block/blk-mq-pci.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2016 Christoph Hellwig. + */ +#include +#include +#include +#include +#include + +#include "blk-mq.h" + +/** + * blk_mq_pci_map_queues - provide a default queue mapping for PCI device + * @qmap: CPU to hardware queue map. + * @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 + * corresponding to each queue for it's affinity mask and built queue mapping + * that maps a queue to the CPUs that have irq affinity for the corresponding + * vector. + */ +void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev, + int offset) +{ + const struct cpumask *mask; + unsigned int queue, cpu; + + for (queue = 0; queue < qmap->nr_queues; queue++) { + mask = pci_irq_get_affinity(pdev, queue + offset); + if (!mask) + goto fallback; + + for_each_cpu(cpu, mask) + qmap->mq_map[cpu] = qmap->queue_offset + queue; + } + + return; + +fallback: + WARN_ON_ONCE(qmap->nr_queues > 1); + blk_mq_clear_mq_map(qmap); +} +EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); -- cgit v1.2.3