linux-kernel - [PATCH v3 02/15] virito: add APIs for retrieving vq affinity

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Message-Id: <20240806-isolcpus-io-queues-v3-2-da0eecfeaf8b@suse.de>
Date: Tue, 06 Aug 2024 14:06:34 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>, 
 Sagi Grimberg <sagi@...mberg.me>, Thomas Gleixner <tglx@...utronix.de>, 
 Christoph Hellwig <hch@....de>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 John Garry <john.g.garry@...cle.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
 Jason Wang <jasowang@...hat.com>, 
 Kashyap Desai <kashyap.desai@...adcom.com>, 
 Sumit Saxena <sumit.saxena@...adcom.com>, 
 Shivasharan S <shivasharan.srikanteshwara@...adcom.com>, 
 Chandrakanth patil <chandrakanth.patil@...adcom.com>, 
 Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>, 
 Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, 
 Nilesh Javali <njavali@...vell.com>, GR-QLogic-Storage-Upstream@...vell.com, 
 Jonathan Corbet <corbet@....net>
Cc: Frederic Weisbecker <frederic@...nel.org>, Mel Gorman <mgorman@...e.de>, 
 Hannes Reinecke <hare@...e.de>, 
 Sridhar Balaraman <sbalaraman@...allelwireless.com>, 
 "brookxu.cn" <brookxu.cn@...il.com>, Ming Lei <ming.lei@...hat.com>, 
 linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, 
 linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org, 
 virtualization@...ts.linux.dev, megaraidlinux.pdl@...adcom.com, 
 mpi3mr-linuxdrv.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com, 
 storagedev@...rochip.com, linux-doc@...r.kernel.org, 
 Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v3 02/15] virito: add APIs for retrieving vq affinity

From: Ming Lei <ming.lei@...hat.com>

virtio-blk/virtio-scsi needs this API for retrieving vq's affinity.

Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/virtio/virtio.c | 10 ++++++++++
 include/linux/virtio.h  |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index a9b93e99c23a..c59a193ef337 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -592,6 +592,16 @@ int virtio_device_restore(struct virtio_device *dev)
 EXPORT_SYMBOL_GPL(virtio_device_restore);
 #endif

+const struct cpumask *virtio_get_vq_affinity(struct virtio_device *dev,
+		int index)
+{
+	if (!dev->config->get_vq_affinity)
+		return NULL;
+
+	return dev->config->get_vq_affinity(dev, index);
+}
+EXPORT_SYMBOL_GPL(virtio_get_vq_affinity);
+
 static int virtio_init(void)
 {
 	if (bus_register(&virtio_bus) != 0)
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index ecc5cb7b8c91..bab3858a4c8a 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -170,6 +170,8 @@ int virtio_device_restore(struct virtio_device *dev);
 void virtio_reset_device(struct virtio_device *dev);

 size_t virtio_max_dma_size(const struct virtio_device *vdev);
+const struct cpumask *virtio_get_vq_affinity(struct virtio_device *dev,
+					     int index);

 #define virtio_device_for_each_vq(vdev, vq) \
 	list_for_each_entry(vq, &vdev->vqs, list)

-- 
2.46.0