From 973c4e372c8f71a15ac39765e657ded70fc87d41 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:56 +0200 Subject: [PATCH] blk-mq: provide a default queue mapping for PCI device Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/Makefile | 2 +- block/blk-mq-pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/blk-mq-pci.h | 9 +++++++++ 3 files changed, 55 insertions(+), 1 deletion(-) create mode 100644 block/blk-mq-pci.c create mode 100644 include/linux/blk-mq-pci.h diff --git a/block/Makefile b/block/Makefile index 9eda232..2447a0b 100644 --- a/block/Makefile +++ b/block/Makefile @@ -22,4 +22,4 @@ obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o - +obj-$(CONFIG_PCI) += blk-mq-pci.o diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c new file mode 100644 index 0000000..33c7bd7 --- /dev/null +++ b/block/blk-mq-pci.c @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2016 Christoph Hellwig. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#include +#include +#include +#include + +/** + * 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. + * + * 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 + * 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_tag_set *set, struct pci_dev *pdev) +{ + const struct cpumask *mask; + unsigned int queue, cpu; + + for (queue = 0; queue < set->nr_hw_queues; queue++) { + mask = pci_irq_get_affinity(pdev, queue); + if (!mask) + return -EINVAL; + + for_each_cpu(cpu, mask) + set->mq_map[cpu] = queue; + } + + return 0; +} +EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); diff --git a/include/linux/blk-mq-pci.h b/include/linux/blk-mq-pci.h new file mode 100644 index 0000000..6ab5952 --- /dev/null +++ b/include/linux/blk-mq-pci.h @@ -0,0 +1,9 @@ +#ifndef _LINUX_BLK_MQ_PCI_H +#define _LINUX_BLK_MQ_PCI_H + +struct blk_mq_tag_set; +struct pci_dev; + +int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev); + +#endif /* _LINUX_BLK_MQ_PCI_H */ -- 2.7.4