linux-kernel - [PATCH v4 04/10] virtio: hookup irq_get

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Message-Id: <20241113-refactor-blk-affinity-helpers-v4-4-dd3baa1e267f@kernel.org>
Date: Wed, 13 Nov 2024 15:26:18 +0100
From: Daniel Wagner <wagi@...nel.org>
To: Jens Axboe <axboe@...nel.dk>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>, 
 Sagi Grimberg <sagi@...mberg.me>, John Garry <john.g.garry@...cle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Hannes Reinecke <hare@...e.de>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, virtualization@...ts.linux.dev, 
 linux-scsi@...r.kernel.org, megaraidlinux.pdl@...adcom.com, 
 mpi3mr-linuxdrv.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com, 
 storagedev@...rochip.com, linux-nvme@...ts.infradead.org, 
 Daniel Wagner <wagi@...nel.org>
Subject: [PATCH v4 04/10] virtio: hookup irq_get_affinity callback

struct bus_type has a new callback for retrieving the IRQ affinity for a
device. Hook this callback up for virtio based devices.

Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/virtio/virtio.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index b9095751e43bb7db5fc991b0cc0979d2e86f7b9b..4ca6ec84cb092eac7ddf4b86b4eacac099b480cf 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -377,6 +377,24 @@ static void virtio_dev_remove(struct device *_d)
 	of_node_put(dev->dev.of_node);
 }

+/**
+ * virtio_irq_get_affinity - get IRQ affinity mask for device
+ * @_d: ptr to dev structure
+ * @irq_vec: interrupt vector number
+ *
+ * Return the CPU affinity mask for @_d and @irq_vec.
+ */
+static const struct cpumask *virtio_irq_get_affinity(struct device *_d,
+						     unsigned int irq_vec)
+{
+	struct virtio_device *dev = dev_to_virtio(_d);
+
+	if (!dev->config->get_vq_affinity)
+		return NULL;
+
+	return dev->config->get_vq_affinity(dev, irq_vec);
+}
+
 static const struct bus_type virtio_bus = {
 	.name  = "virtio",
 	.match = virtio_dev_match,
@@ -384,6 +402,7 @@ 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)

-- 
2.47.0