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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /block/blk-mq-pci.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'block/blk-mq-pci.c')
-rw-r--r-- | block/blk-mq-pci.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c new file mode 100644 index 000000000..b595a94c4 --- /dev/null +++ b/block/blk-mq-pci.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2016 Christoph Hellwig. + */ +#include <linux/kobject.h> +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/blk-mq-pci.h> +#include <linux/pci.h> +#include <linux/module.h> + +#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. + */ +int 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 0; + +fallback: + WARN_ON_ONCE(qmap->nr_queues > 1); + blk_mq_clear_mq_map(qmap); + return 0; +} +EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); |