From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22D661AAE2C; Mon, 11 Nov 2024 19:00:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731351653; cv=none; b=L/jhslM0+gWVZX/x1sjYd1Ockv3kBw52+fQ9bNMkvWaYTg3AODNniNBh67OAYPrR+xIjmVuCx/lgqOgCD2UwLOzb4ba162WsNkoLmBhko5m3jCful4FdqNVlRZpZsErDnWbxyHNkqBUqeioWHVk7zYUTvp2E2s1+eFJpwZMuYcM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731351653; c=relaxed/simple; bh=mBGeH5YCHeqpmaVtCC4xNxEVGj3Tk2zJbSDEmkvUaZo=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=Ic+4OSPci9qseKZqAIk8PuBwmUJMNHdU6h/DRG4x2wywZg3zrdsOOK+GzFcg3psPmQ6h9l2QFzM6kXCuQtIsLgz72BffFf+xXaJrKO1WgtYllTFMw7Sm1Vemr9awBfoIeB1J7MehP7EP9tI823b+gwJhnahd6cGS3wlYO+UMZbk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UZuo15Pc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UZuo15Pc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74332C4CECF; Mon, 11 Nov 2024 19:00:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731351652; bh=mBGeH5YCHeqpmaVtCC4xNxEVGj3Tk2zJbSDEmkvUaZo=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=UZuo15PcJS/fEIOQ6yrQZTCNsCHxALYUSOIScmrvPXDJQMhjZNRf770l5Z2728P++ sy8pSV0/eNPBepxRoigBkIKb0XH1OvGgWVyPX22NcqViE6DDwLAVVXWnXuCUzpes09 lHS0vENq4YFXdU0mUsLirNk95YYHGCJlWvdVwUC/u3R3DDoWinOdJrPNexHJoZJvi+ FXMnSuyudT7o6Hbdq9m61YbmKnSrH/ylUSZYPUcgUfq2263puVOgFdFU1l8LgF6TF2 DzNYr+bq6UOg+kK26HjR8uGDJagpRazxz87uTZZxnXAtAB+bvlYg8MxiqUp5Ze5QPO hRhDf1RlHJlrQ== Date: Mon, 11 Nov 2024 13:00:51 -0600 From: Bjorn Helgaas To: Daniel Wagner Cc: Jens Axboe , Bjorn Helgaas , "Michael S. Tsirkin" , Jason Wang , "Martin K. Petersen" , Keith Busch , Christoph Hellwig , Sagi Grimberg , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, virtualization@lists.linux.dev, linux-scsi@vger.kernel.org, megaraidlinux.pdl@broadcom.com, mpi3mr-linuxdrv.pdl@broadcom.com, MPT-FusionLinux.pdl@broadcom.com, storagedev@microchip.com, linux-nvme@lists.infradead.org, Daniel Wagner Subject: Re: [PATCH v2 1/6] blk-mq: introduce blk_mq_hctx_map_queues Message-ID: <20241111190051.GA1805960@bhelgaas> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241111-refactor-blk-affinity-helpers-v2-1-f360ddad231a@kernel.org> On Mon, Nov 11, 2024 at 07:02:09PM +0100, Daniel Wagner wrote: > blk_mq_pci_map_queues and blk_mq_virtio_map_queues will create a CPU to > hardware queue mapping based on affinity information. These two function > share common code and only differ on how the affinity information is > retrieved. Also, those functions are located in the block subsystem > where it doesn't really fit in. They are virtio and pci subsystem > specific. > > Introduce a new callback in struct bus_type to get the affinity mask. > The callbacks can then be populated by the subsystem directly. > > All but one driver use the subsystem default affinity masks. hisi_sas v2 > depends on a driver specific mapping, thus use the optional argument > get_queue_affinity to retrieve the mapping. > > Original-by : Ming Lei > Signed-off-by: Daniel Wagner > --- > block/blk-mq-cpumap.c | 40 ++++++++++++++++++++++++++++++++++++++++ > drivers/pci/pci-driver.c | 16 ++++++++++++++++ > drivers/virtio/virtio.c | 12 ++++++++++++ > include/linux/blk-mq.h | 5 +++++ > include/linux/device/bus.h | 3 +++ > 5 files changed, 76 insertions(+) > > diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c > index 9638b25fd52124f0173e968ebdca5f1fe0b42ad9..4dd703f5ee647fd1ba0b14ca11ddfdefa98a9a25 100644 > --- a/block/blk-mq-cpumap.c > +++ b/block/blk-mq-cpumap.c > @@ -54,3 +54,43 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index) > > return NUMA_NO_NODE; > } > + > +/** > + * blk_mq_hctx_map_queues - Create CPU to hardware queue mapping > + * @qmap: CPU to hardware queue map. > + * @dev: The device to map queues. > + * @offset: Queue offset to use for the device. > + * @get_irq_affinity: Optional callback to retrieve queue affinity. > + * > + * Create a CPU to hardware queue mapping in @qmap. For each queue > + * @get_queue_affinity will be called. If @get_queue_affinity is not > + * provided, then the bus_type irq_get_affinity callback will be > + * used to retrieve the affinity. > + */ > +void blk_mq_hctx_map_queues(struct blk_mq_queue_map *qmap, > + struct device *dev, unsigned int offset, > + get_queue_affinity_fn *get_irq_affinity) > +{ > + const struct cpumask *mask = NULL; > + unsigned int queue, cpu; > + > + for (queue = 0; queue < qmap->nr_queues; queue++) { > + if (get_irq_affinity) > + mask = get_irq_affinity(dev, queue + offset); > + else if (dev->bus->irq_get_affinity) > + mask = dev->bus->irq_get_affinity(dev, 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_hctx_map_queues); > diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c > index 35270172c833186995aebdda6f95ab3ffd7c67a0..59e5f430a380285162a87bd1a9b392bba8066450 100644 > --- a/drivers/pci/pci-driver.c > +++ b/drivers/pci/pci-driver.c > @@ -1670,6 +1670,21 @@ static void pci_dma_cleanup(struct device *dev) > iommu_device_unuse_default_domain(dev); > } > > +/** > + * pci_device_irq_get_affinity - get affinity mask queue mapping for PCI device > + * @dev: ptr to dev structure > + * @irq_vec: interrupt vector number > + * > + * This function returns for a queue the affinity mask for a PCI device. >From the PCI core perspective, this is only the *IRQ* affinity mask. The queue connection is not relevant here and probably confusing. ... - get IRQ affinity mask for device Return the CPU affinity mask for @dev and @irq_vec. With the above changes, Acked-by: Bjorn Helgaas > + */ > +static const struct cpumask *pci_device_irq_get_affinity(struct device *dev, > + unsigned int irq_vec) > +{ > + struct pci_dev *pdev = to_pci_dev(dev); > + > + return pci_irq_get_affinity(pdev, irq_vec); > +} > + > const struct bus_type pci_bus_type = { > .name = "pci", > .match = pci_bus_match, > @@ -1677,6 +1692,7 @@ const struct bus_type pci_bus_type = { > .probe = pci_device_probe, > .remove = pci_device_remove, > .shutdown = pci_device_shutdown, > + .irq_get_affinity = pci_device_irq_get_affinity, > .dev_groups = pci_dev_groups, > .bus_groups = pci_bus_groups, > .drv_groups = pci_drv_groups, > diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c > index b9095751e43bb7db5fc991b0cc0979d2e86f7b9b..86390db7e74befa17c9fa146ab6b454bbae3b7f5 100644 > --- a/drivers/virtio/virtio.c > +++ b/drivers/virtio/virtio.c > @@ -377,6 +377,17 @@ static void virtio_dev_remove(struct device *_d) > of_node_put(dev->dev.of_node); > } > > +static const struct cpumask *virtio_irq_get_affinity(struct device *_d, > + unsigned int irq_veq) > +{ > + struct virtio_device *dev = dev_to_virtio(_d); > + > + if (!dev->config->get_vq_affinity) > + return NULL; > + > + return dev->config->get_vq_affinity(dev, irq_veq); > +} > + > static const struct bus_type virtio_bus = { > .name = "virtio", > .match = virtio_dev_match, > @@ -384,6 +395,7 @@ static const struct bus_type virtio_bus = { > .uevent = virtio_uevent, > .probe = virtio_dev_probe, > .remove = virtio_dev_remove, > + .irq_get_affinity = virtio_irq_get_affinity, > }; > > int __register_virtio_driver(struct virtio_driver *driver, struct module *owner) > diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h > index 2035fad3131fb60781957095ce8a3a941dd104be..6b40af77bf44afa7112d274b731b591f2a67d68c 100644 > --- a/include/linux/blk-mq.h > +++ b/include/linux/blk-mq.h > @@ -922,7 +922,12 @@ int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, > void blk_mq_unfreeze_queue_non_owner(struct request_queue *q); > void blk_freeze_queue_start_non_owner(struct request_queue *q); > > +typedef const struct cpumask *(get_queue_affinity_fn)(struct device *dev, > + unsigned int queue); > void blk_mq_map_queues(struct blk_mq_queue_map *qmap); > +void blk_mq_hctx_map_queues(struct blk_mq_queue_map *qmap, > + struct device *dev, unsigned int offset, > + get_queue_affinity_fn *get_queue_affinity); > void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); > > void blk_mq_quiesce_queue_nowait(struct request_queue *q); > diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h > index cdc4757217f9bb4b36b5c3b8a48bab45737e44c5..b18658bce2c3819fc1cbeb38fb98391d56ec3317 100644 > --- a/include/linux/device/bus.h > +++ b/include/linux/device/bus.h > @@ -48,6 +48,7 @@ struct fwnode_handle; > * will never get called until they do. > * @remove: Called when a device removed from this bus. > * @shutdown: Called at shut-down time to quiesce the device. > + * @irq_get_affinity: Get IRQ affinity mask for the device on this bus. > * > * @online: Called to put the device back online (after offlining it). > * @offline: Called to put the device offline for hot-removal. May fail. > @@ -87,6 +88,8 @@ struct bus_type { > void (*sync_state)(struct device *dev); > void (*remove)(struct device *dev); > void (*shutdown)(struct device *dev); > + const struct cpumask *(*irq_get_affinity)(struct device *dev, > + unsigned int irq_vec); > > int (*online)(struct device *dev); > int (*offline)(struct device *dev); > > -- > 2.47.0 >