linux-kernel - [PATCH v5 1/8] driver core: bus: add irq_get_affinity callback to bus

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Message-Id: <20241115-refactor-blk-affinity-helpers-v5-1-c472afd84d9f@kernel.org>
Date: Fri, 15 Nov 2024 17:37:45 +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>, Ming Lei <ming.lei@...hat.com>
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 v5 1/8] driver core: bus: add irq_get_affinity callback to
 bus_type

Introducing a callback in struct bus_type so that a subsystem
can hook up the getters directly. This approach avoids exposing
random getters in any subsystems APIs.

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 include/linux/device/bus.h | 3 +++
 1 file changed, 3 insertions(+)

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