[PATCH v5 0/8] blk: refactor queue affinity helpers

[PATCH v5 0/8] blk: refactor queue affinity helpers

[Daniel Wagner]

It turns out, it's just not worth to add bits to the core just for
hisi_sas_v2 driver. I dropped those changes.

BTW, this series is based on linux-block/for-next from 2024-11-11. Not
sure if this is the right base, if not please let me know which branch I
should use.

Original cover letter:

These patches were part of 'honor isolcpus configuration' [1] series. To
simplify the review process I decided to send this as separate series
because I think it's a nice cleanup independent of the isolcpus feature.

Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
Changes in v5:
- dropped the irq_get_affinity callback from struct device_driver
  again.
- s/blk_mq_hctx_map_queues/blk_mq_map_hw_queues/
- collected tags
- Link to v4: https://lore.kernel.org/r/20241113-refactor-blk-affinity-helpers-v4-0-dd3baa1e267f@kernel.org

Changes in v4:
- added irq_get_affinity callback to struct device_driver
- hisi_sas use dev pointer directly from hisi_hba.
- blk_mq_hctx_map_queues: ty irq_get_affinity callback
  from device_driver first then from bus_type
- collected tags
- fixed typos
- Link to v3: https://lore.kernel.org/r/20241112-refactor-blk-affinity-helpers-v3-0-573bfca0cbd8@kernel.org

Changes in v3:
- dropped the additinal argument in blk_mq_hctx_map_queues.
  leave open coded version in hisi_sas_v2.
- splitted "blk-mp: introduce blk_mq_hctx_map_queues" patch into
  three patches.
- dropped local variable in pci_device_irq_get_affinity
- Link to v2: https://lore.kernel.org/r/20241111-refactor-blk-affinity-helpers-v2-0-f360ddad231a@kernel.org

Changes in v2:
- added new callback to struct bus_type and call directly the affinity
  helpers from there.
- Link to v1: https://lore.kernel.org/r/20240913-refactor-blk-affinity-helpers-v1-0-8e058f77af12@suse.de

Changes in v1:
- renamed blk_mq_dev_map_queues to blk_mq_hctx_map_queues
- squased 'virito: add APIs for retrieving vq affinity' into
  'blk-mq: introduce blk_mq_hctx_map_queues'
- moved hisi_sas changed into a new patch
- hisi_sas use define instead of hard coded value
- moved helpers into their matching subsystem, removed
  blk-mq-pci and blk-mq-virtio files
- fix spelling/typos
- fixed long lines in docu (yep new lines in brief descriptions are
  supported, tested ti)
- based on the first part of
  [1] https://lore.kernel.org/all/20240806-isolcpus-io-queues-v3-0-da0eecfeaf8b@suse.de

---
Daniel Wagner (8):
      driver core: bus: add irq_get_affinity callback to bus_type
      PCI: hookup irq_get_affinity callback
      virtio: hookup irq_get_affinity callback
      blk-mq: introduce blk_mq_map_hw_queues
      scsi: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues
      nvme: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues
      virtio: blk/scsi: replace blk_mq_virtio_map_queues with blk_mq_map_hw_queues
      blk-mq: remove unused queue mapping helpers

 block/Makefile                            |  2 --
 block/blk-mq-cpumap.c                     | 37 +++++++++++++++++++++++++
 block/blk-mq-pci.c                        | 46 -------------------------------
 block/blk-mq-virtio.c                     | 46 -------------------------------
 drivers/block/virtio_blk.c                |  4 +--
 drivers/nvme/host/fc.c                    |  1 -
 drivers/nvme/host/pci.c                   |  3 +-
 drivers/pci/pci-driver.c                  | 14 ++++++++++
 drivers/scsi/fnic/fnic_main.c             |  3 +-
 drivers/scsi/hisi_sas/hisi_sas.h          |  1 -
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c    |  4 +--
 drivers/scsi/megaraid/megaraid_sas_base.c |  3 +-
 drivers/scsi/mpi3mr/mpi3mr.h              |  1 -
 drivers/scsi/mpi3mr/mpi3mr_os.c           |  2 +-
 drivers/scsi/mpt3sas/mpt3sas_scsih.c      |  3 +-
 drivers/scsi/pm8001/pm8001_init.c         |  2 +-
 drivers/scsi/pm8001/pm8001_sas.h          |  1 -
 drivers/scsi/qla2xxx/qla_nvme.c           |  3 +-
 drivers/scsi/qla2xxx/qla_os.c             |  4 +--
 drivers/scsi/smartpqi/smartpqi_init.c     |  7 ++---
 drivers/scsi/virtio_scsi.c                |  3 +-
 drivers/virtio/virtio.c                   | 19 +++++++++++++
 include/linux/blk-mq-pci.h                | 11 --------
 include/linux/blk-mq-virtio.h             | 11 --------
 include/linux/blk-mq.h                    |  2 ++
 include/linux/device/bus.h                |  3 ++
 26 files changed, 92 insertions(+), 144 deletions(-)
---
base-commit: c9af98a7e8af266bae73e9d662b8341da1ec5824
change-id: 20240912-refactor-blk-affinity-helpers-7089b95b4b10

Best regards,
-- 
Daniel Wagner <wagi@kernel.org>

[PATCH v5 1/8] driver core: bus: add irq_get_affinity callback to bus_type

[Daniel Wagner]

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@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Daniel Wagner <wagi@kernel.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

[PATCH v5 2/8] PCI: hookup irq_get_affinity callback

[Daniel Wagner]

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

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 drivers/pci/pci-driver.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 35270172c833186995aebdda6f95ab3ffd7c67a0..a9cb0e3ad2e6eca58c34683303b1242228e96909 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -1670,6 +1670,19 @@ static void pci_dma_cleanup(struct device *dev)
 		iommu_device_unuse_default_domain(dev);
 }
 
+/**
+ * pci_device_irq_get_affinity - get IRQ affinity mask for device
+ * @dev: ptr to dev structure
+ * @irq_vec: interrupt vector number
+ *
+ * Return the CPU affinity mask for @dev and @irq_vec.
+ */
+static const struct cpumask *pci_device_irq_get_affinity(struct device *dev,
+					unsigned int irq_vec)
+{
+	return pci_irq_get_affinity(to_pci_dev(dev), irq_vec);
+}
+
 const struct bus_type pci_bus_type = {
 	.name		= "pci",
 	.match		= pci_bus_match,
@@ -1677,6 +1690,7 @@ 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,

-- 
2.47.0

[PATCH v5 3/8] virtio: hookup irq_get_affinity callback

[Daniel Wagner]

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@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Daniel Wagner <wagi@kernel.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

[PATCH v5 4/8] blk-mq: introduce blk_mq_map_hw_queues

[Daniel Wagner]

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.

Thus introduce provide a generic mapping function which uses the
irq_get_affinity callback from bus_type.

Originally idea from Ming Lei <ming.lei@redhat.com>

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 block/blk-mq-cpumap.c  | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/blk-mq.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 9638b25fd52124f0173e968ebdca5f1fe0b42ad9..0b65ffa5a183cc8e6697df4a16748eff15bfa8b3 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -11,6 +11,7 @@
 #include <linux/smp.h>
 #include <linux/cpu.h>
 #include <linux/group_cpus.h>
+#include <linux/device/bus.h>
 
 #include "blk.h"
 #include "blk-mq.h"
@@ -54,3 +55,39 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index)
 
 	return NUMA_NO_NODE;
 }
+
+/**
+ * blk_mq_map_hw_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.
+ *
+ * Create a CPU to hardware queue mapping in @qmap. The struct bus_type
+ * irq_get_affinity callback will be used to retrieve the affinity.
+ */
+void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap,
+			  struct device *dev, unsigned int offset)
+
+{
+	const struct cpumask *mask;
+	unsigned int queue, cpu;
+
+	if (!dev->bus->irq_get_affinity)
+		goto fallback;
+
+	for (queue = 0; queue < qmap->nr_queues; queue++) {
+		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_map_hw_queues);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 2035fad3131fb60781957095ce8a3a941dd104be..05f544a9ed873d2f96d72c18e124c94146f6943f 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -923,6 +923,8 @@ void blk_mq_unfreeze_queue_non_owner(struct request_queue *q);
 void blk_freeze_queue_start_non_owner(struct request_queue *q);
 
 void blk_mq_map_queues(struct blk_mq_queue_map *qmap);
+void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap,
+			  struct device *dev, unsigned int offset);
 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);

-- 
2.47.0

[PATCH v5 5/8] scsi: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[Daniel Wagner]

Replace all users of blk_mq_pci_map_queues with the more generic
blk_mq_map_hw_queues. This in preparation to retire
blk_mq_pci_map_queues.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 drivers/scsi/fnic/fnic_main.c             | 3 +--
 drivers/scsi/hisi_sas/hisi_sas.h          | 1 -
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c    | 4 ++--
 drivers/scsi/megaraid/megaraid_sas_base.c | 3 +--
 drivers/scsi/mpi3mr/mpi3mr.h              | 1 -
 drivers/scsi/mpi3mr/mpi3mr_os.c           | 2 +-
 drivers/scsi/mpt3sas/mpt3sas_scsih.c      | 3 +--
 drivers/scsi/pm8001/pm8001_init.c         | 2 +-
 drivers/scsi/pm8001/pm8001_sas.h          | 1 -
 drivers/scsi/qla2xxx/qla_nvme.c           | 3 +--
 drivers/scsi/qla2xxx/qla_os.c             | 4 ++--
 drivers/scsi/smartpqi/smartpqi_init.c     | 7 +++----
 12 files changed, 13 insertions(+), 21 deletions(-)

diff --git a/drivers/scsi/fnic/fnic_main.c b/drivers/scsi/fnic/fnic_main.c
index adec0df24bc475ea4d7d8089ea0f75fe96746956..1cb517f731f4ac0e7dfa61ddac8ccbe64f5343dc 100644
--- a/drivers/scsi/fnic/fnic_main.c
+++ b/drivers/scsi/fnic/fnic_main.c
@@ -16,7 +16,6 @@
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
 #include <linux/if_ether.h>
-#include <linux/blk-mq-pci.h>
 #include <scsi/fc/fc_fip.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
@@ -601,7 +600,7 @@ void fnic_mq_map_queues_cpus(struct Scsi_Host *host)
 		return;
 	}
 
-	blk_mq_pci_map_queues(qmap, l_pdev, FNIC_PCI_OFFSET);
+	blk_mq_map_hw_queues(qmap, &l_pdev->dev, FNIC_PCI_OFFSET);
 }
 
 static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index d223f482488fc6cebc2838e92ae7ec70fb4e1437..010479a354eeeb47bbee24102e450aa3b7ea6197 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -9,7 +9,6 @@
 
 #include <linux/acpi.h>
 #include <linux/blk-mq.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/clk.h>
 #include <linux/debugfs.h>
 #include <linux/dmapool.h>
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 4cd3a3eab6f1c47c962565a74cd7284dad1db12e..4a0eefa8ab847d9f81afb422e1a1c49391b7c569 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -3322,8 +3322,8 @@ static void hisi_sas_map_queues(struct Scsi_Host *shost)
 		if (i == HCTX_TYPE_POLL)
 			blk_mq_map_queues(qmap);
 		else
-			blk_mq_pci_map_queues(qmap, hisi_hba->pci_dev,
-					      BASE_VECTORS_V3_HW);
+			blk_mq_map_hw_queues(qmap, hisi_hba->dev,
+					     BASE_VECTORS_V3_HW);
 		qoff += qmap->nr_queues;
 	}
 }
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 8e75e2e279a40ae5fdc6b7b07a7aed15241a8d54..f87883bf9ae90f4330194ff36e7cdb7cce99af30 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -37,7 +37,6 @@
 #include <linux/poll.h>
 #include <linux/vmalloc.h>
 #include <linux/irq_poll.h>
-#include <linux/blk-mq-pci.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -3193,7 +3192,7 @@ static void megasas_map_queues(struct Scsi_Host *shost)
 	map = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
 	map->nr_queues = instance->msix_vectors - offset;
 	map->queue_offset = 0;
-	blk_mq_pci_map_queues(map, instance->pdev, offset);
+	blk_mq_map_hw_queues(map, &instance->pdev->dev, offset);
 	qoff += map->nr_queues;
 	offset += map->nr_queues;
 
diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 81bb408ce56d8f9599e6f62276666bedce6d0d32..57ccea42ece1ecf1c471ee744213453b13db0ea1 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -12,7 +12,6 @@
 
 #include <linux/blkdev.h>
 #include <linux/blk-mq.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/delay.h>
 #include <linux/dmapool.h>
 #include <linux/errno.h>
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 5f2f67acf8bf3194cb8ec78904096ffb4bdd7ff2..3f46f37f5c35d86bcf5f815e0117825f7bc79861 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -4042,7 +4042,7 @@ static void mpi3mr_map_queues(struct Scsi_Host *shost)
 		 */
 		map->queue_offset = qoff;
 		if (i != HCTX_TYPE_POLL)
-			blk_mq_pci_map_queues(map, mrioc->pdev, offset);
+			blk_mq_map_hw_queues(map, &mrioc->pdev->dev, offset);
 		else
 			blk_mq_map_queues(map);
 
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index f2a55aa5fe65036a3beabae5c0c6e9db835d2aab..9599d7a50028687e3ac09d4eadbdf8b5b00dbe03 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -53,7 +53,6 @@
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/raid_class.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/unaligned.h>
 
 #include "mpt3sas_base.h"
@@ -11890,7 +11889,7 @@ static void scsih_map_queues(struct Scsi_Host *shost)
 		 */
 		map->queue_offset = qoff;
 		if (i != HCTX_TYPE_POLL)
-			blk_mq_pci_map_queues(map, ioc->pdev, offset);
+			blk_mq_map_hw_queues(map, &ioc->pdev->dev, offset);
 		else
 			blk_mq_map_queues(map);
 
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index 33e1eba62ca12c2555419197ecdbebad817e4a6d..b53b1ae5b74c3039618c65e4620ae744e084b157 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -101,7 +101,7 @@ static void pm8001_map_queues(struct Scsi_Host *shost)
 	struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
 
 	if (pm8001_ha->number_of_intr > 1) {
-		blk_mq_pci_map_queues(qmap, pm8001_ha->pdev, 1);
+		blk_mq_map_hw_queues(qmap, &pm8001_ha->pdev->dev, 1);
 		return;
 	}
 
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index ced6721380a85345a74a87ebd2facdaa513f8768..c46470e0cf63b7b18b9572c8d6b4f4ddf489aa2b 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -56,7 +56,6 @@
 #include <scsi/sas_ata.h>
 #include <linux/atomic.h>
 #include <linux/blk-mq.h>
-#include <linux/blk-mq-pci.h>
 #include "pm8001_defs.h"
 
 #define DRV_NAME		"pm80xx"
diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 8f4cc136a9c9c46f5f2d5408f9b7688ef520a8a3..8ee2e337c9e1b71c031e70c9f67cf131b4a0682c 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -8,7 +8,6 @@
 #include <linux/delay.h>
 #include <linux/nvme.h>
 #include <linux/nvme-fc.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/blk-mq.h>
 
 static struct nvme_fc_port_template qla_nvme_fc_transport;
@@ -841,7 +840,7 @@ static void qla_nvme_map_queues(struct nvme_fc_local_port *lport,
 {
 	struct scsi_qla_host *vha = lport->private;
 
-	blk_mq_pci_map_queues(map, vha->hw->pdev, vha->irq_offset);
+	blk_mq_map_hw_queues(map, &vha->hw->pdev->dev, vha->irq_offset);
 }
 
 static void qla_nvme_localport_delete(struct nvme_fc_local_port *lport)
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 7f980e6141c28282d4c4a0123dda96e36e1f180e..e46cb72fe9e9b058a176ff43260608948590ecdc 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -13,7 +13,6 @@
 #include <linux/mutex.h>
 #include <linux/kobject.h>
 #include <linux/slab.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/refcount.h>
 #include <linux/crash_dump.h>
 #include <linux/trace_events.h>
@@ -8070,7 +8069,8 @@ static void qla2xxx_map_queues(struct Scsi_Host *shost)
 	if (USER_CTRL_IRQ(vha->hw) || !vha->hw->mqiobase)
 		blk_mq_map_queues(qmap);
 	else
-		blk_mq_pci_map_queues(qmap, vha->hw->pdev, vha->irq_offset);
+		blk_mq_map_hw_queues(qmap, &vha->hw->pdev->dev,
+				       vha->irq_offset);
 }
 
 struct scsi_host_template qla2xxx_driver_template = {
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 870f37b7054644426a2695e857c45a0a12aff051..04fb24d77e9b5c0137f26bc41f17191cc4c49728 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -19,7 +19,6 @@
 #include <linux/bcd.h>
 #include <linux/reboot.h>
 #include <linux/cciss_ioctl.h>
-#include <linux/blk-mq-pci.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
@@ -6547,10 +6546,10 @@ static void pqi_map_queues(struct Scsi_Host *shost)
 	struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
 
 	if (!ctrl_info->disable_managed_interrupts)
-		return blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT],
-			      ctrl_info->pci_dev, 0);
+		blk_mq_map_hw_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT],
+				       &ctrl_info->pci_dev->dev, 0);
 	else
-		return blk_mq_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT]);
+		blk_mq_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT]);
 }
 
 static inline bool pqi_is_tape_changer_device(struct pqi_scsi_dev *device)

-- 
2.47.0

[PATCH v5 6/8] nvme: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[Daniel Wagner]

Replace all users of blk_mq_pci_map_queues with the more generic
blk_mq_map_hw_queues. This in preparation to retire
blk_mq_pci_map_queues.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 drivers/nvme/host/fc.c  | 1 -
 drivers/nvme/host/pci.c | 3 +--
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index b81af7919e94c421387033bf8361a9cf8a867486..094be164ffdc0fb79050cfb92c32dfaee8d15622 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -16,7 +16,6 @@
 #include <linux/nvme-fc.h>
 #include "fc.h"
 #include <scsi/scsi_transport_fc.h>
-#include <linux/blk-mq-pci.h>
 
 /* *************************** Data Structures/Defines ****************** */
 
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 4b9fda0b1d9a33af4d7030b72532835b205e9cbb..be1ab319131dbb9735993e26dfe4813fb13182f6 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -8,7 +8,6 @@
 #include <linux/async.h>
 #include <linux/blkdev.h>
 #include <linux/blk-mq.h>
-#include <linux/blk-mq-pci.h>
 #include <linux/blk-integrity.h>
 #include <linux/dmi.h>
 #include <linux/init.h>
@@ -457,7 +456,7 @@ static void nvme_pci_map_queues(struct blk_mq_tag_set *set)
 		 */
 		map->queue_offset = qoff;
 		if (i != HCTX_TYPE_POLL && offset)
-			blk_mq_pci_map_queues(map, to_pci_dev(dev->dev), offset);
+			blk_mq_map_hw_queues(map, dev->dev, offset);
 		else
 			blk_mq_map_queues(map);
 		qoff += map->nr_queues;

-- 
2.47.0

[PATCH v5 7/8] virtio: blk/scsi: replace blk_mq_virtio_map_queues with blk_mq_map_hw_queues

[Daniel Wagner]

Replace all users of blk_mq_virtio_map_queues with the more generic
blk_mq_map_hw_queues. This in preparation to retire
blk_mq_virtio_map_queues.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 drivers/block/virtio_blk.c | 4 ++--
 drivers/scsi/virtio_scsi.c | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 0e99a4714928478c1ba81777b8e98448eb5b992a..c4a8ad396cce2d5a7b9e8d2ac53c191b8f6709de 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -13,7 +13,6 @@
 #include <linux/string_helpers.h>
 #include <linux/idr.h>
 #include <linux/blk-mq.h>
-#include <linux/blk-mq-virtio.h>
 #include <linux/numa.h>
 #include <linux/vmalloc.h>
 #include <uapi/linux/virtio_ring.h>
@@ -1186,7 +1185,8 @@ static void virtblk_map_queues(struct blk_mq_tag_set *set)
 		if (i == HCTX_TYPE_POLL)
 			blk_mq_map_queues(&set->map[i]);
 		else
-			blk_mq_virtio_map_queues(&set->map[i], vblk->vdev, 0);
+			blk_mq_map_hw_queues(&set->map[i],
+					     &vblk->vdev->dev, 0);
 	}
 }
 
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 8471f38b730e205eb57052305c154260864bee95..60be1a0c61836ba643adcf9ad8d5b68563a86cb1 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -29,7 +29,6 @@
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi_devinfo.h>
 #include <linux/seqlock.h>
-#include <linux/blk-mq-virtio.h>
 
 #include "sd.h"
 
@@ -746,7 +745,7 @@ static void virtscsi_map_queues(struct Scsi_Host *shost)
 		if (i == HCTX_TYPE_POLL)
 			blk_mq_map_queues(map);
 		else
-			blk_mq_virtio_map_queues(map, vscsi->vdev, 2);
+			blk_mq_map_hw_queues(map, &vscsi->vdev->dev, 2);
 	}
 }
 

-- 
2.47.0

[PATCH v5 8/8] blk-mq: remove unused queue mapping helpers

[Daniel Wagner]

There are no users left of the pci and virtio queue mapping helpers.
Thus remove them.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
 block/Makefile                |  2 --
 block/blk-mq-pci.c            | 46 -------------------------------------------
 block/blk-mq-virtio.c         | 46 -------------------------------------------
 include/linux/blk-mq-pci.h    | 11 -----------
 include/linux/blk-mq-virtio.h | 11 -----------
 5 files changed, 116 deletions(-)

diff --git a/block/Makefile b/block/Makefile
index ddfd21c1a9ffc9c4f49efca9875bd8a1cbf81e4d..33748123710b368a1a3a7b099bbd90d27b24c69b 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -27,8 +27,6 @@ bfq-y				:= bfq-iosched.o bfq-wf2q.o bfq-cgroup.o
 obj-$(CONFIG_IOSCHED_BFQ)	+= bfq.o
 
 obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
-obj-$(CONFIG_BLK_MQ_PCI)	+= blk-mq-pci.o
-obj-$(CONFIG_BLK_MQ_VIRTIO)	+= blk-mq-virtio.o
 obj-$(CONFIG_BLK_DEV_ZONED)	+= blk-zoned.o
 obj-$(CONFIG_BLK_WBT)		+= blk-wbt.o
 obj-$(CONFIG_BLK_DEBUG_FS)	+= blk-mq-debugfs.o
diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c
deleted file mode 100644
index d47b5c73c9eb715be7627a2952ad0ef921dd5bc6..0000000000000000000000000000000000000000
--- a/block/blk-mq-pci.c
+++ /dev/null
@@ -1,46 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2016 Christoph Hellwig.
- */
-#include <linux/kobject.h>
-#include <linux/blkdev.h>
-#include <linux/blk-mq-pci.h>
-#include <linux/pci.h>
-#include <linux/module.h>
-
-#include "blk-mq.h"
-
-/**
- * blk_mq_pci_map_queues - provide a default queue mapping for PCI device
- * @qmap:	CPU to hardware queue map.
- * @pdev:	PCI device associated with @set.
- * @offset:	Offset to use for the pci irq vector
- *
- * This function assumes the PCI device @pdev has at least as many available
- * interrupt vectors as @set has queues.  It will then query 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.
- */
-void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev,
-			   int offset)
-{
-	const struct cpumask *mask;
-	unsigned int queue, cpu;
-
-	for (queue = 0; queue < qmap->nr_queues; queue++) {
-		mask = pci_irq_get_affinity(pdev, 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_pci_map_queues);
diff --git a/block/blk-mq-virtio.c b/block/blk-mq-virtio.c
deleted file mode 100644
index 68d0945c0b08a2be116125f46c3a56fcdb02aea8..0000000000000000000000000000000000000000
--- a/block/blk-mq-virtio.c
+++ /dev/null
@@ -1,46 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2016 Christoph Hellwig.
- */
-#include <linux/device.h>
-#include <linux/blk-mq-virtio.h>
-#include <linux/virtio_config.h>
-#include <linux/module.h>
-#include "blk-mq.h"
-
-/**
- * blk_mq_virtio_map_queues - provide a default queue mapping for virtio device
- * @qmap:	CPU to hardware queue map.
- * @vdev:	virtio device to provide a mapping for.
- * @first_vec:	first interrupt vectors to use for queues (usually 0)
- *
- * This function assumes the virtio device @vdev has at least as many available
- * interrupt vectors as @set has queues.  It will then query 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.
- */
-void blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap,
-		struct virtio_device *vdev, int first_vec)
-{
-	const struct cpumask *mask;
-	unsigned int queue, cpu;
-
-	if (!vdev->config->get_vq_affinity)
-		goto fallback;
-
-	for (queue = 0; queue < qmap->nr_queues; queue++) {
-		mask = vdev->config->get_vq_affinity(vdev, first_vec + queue);
-		if (!mask)
-			goto fallback;
-
-		for_each_cpu(cpu, mask)
-			qmap->mq_map[cpu] = qmap->queue_offset + queue;
-	}
-
-	return;
-
-fallback:
-	blk_mq_map_queues(qmap);
-}
-EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues);
diff --git a/include/linux/blk-mq-pci.h b/include/linux/blk-mq-pci.h
deleted file mode 100644
index ca544e1d3508f34ab6e198b0bb17efe88de4d14d..0000000000000000000000000000000000000000
--- a/include/linux/blk-mq-pci.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_BLK_MQ_PCI_H
-#define _LINUX_BLK_MQ_PCI_H
-
-struct blk_mq_queue_map;
-struct pci_dev;
-
-void blk_mq_pci_map_queues(struct blk_mq_queue_map *qmap, struct pci_dev *pdev,
-			   int offset);
-
-#endif /* _LINUX_BLK_MQ_PCI_H */
diff --git a/include/linux/blk-mq-virtio.h b/include/linux/blk-mq-virtio.h
deleted file mode 100644
index 13226e9b22dd53e4289d506d49c52671de036ee8..0000000000000000000000000000000000000000
--- a/include/linux/blk-mq-virtio.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_BLK_MQ_VIRTIO_H
-#define _LINUX_BLK_MQ_VIRTIO_H
-
-struct blk_mq_queue_map;
-struct virtio_device;
-
-void blk_mq_virtio_map_queues(struct blk_mq_queue_map *qmap,
-		struct virtio_device *vdev, int first_vec);
-
-#endif /* _LINUX_BLK_MQ_VIRTIO_H */

-- 
2.47.0

Re: [PATCH v5 1/8] driver core: bus: add irq_get_affinity callback to bus_type

[Greg Kroah-Hartman]

On Fri, Nov 15, 2024 at 05:37:45PM +0100, Daniel Wagner wrote:
> 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@google.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Ming Lei <ming.lei@redhat.com>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH v5 5/8] scsi: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[Martin K. Petersen]

Daniel,

> Replace all users of blk_mq_pci_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_pci_map_queues.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: [PATCH v5 4/8] blk-mq: introduce blk_mq_map_hw_queues

[Ming Lei]

On Fri, Nov 15, 2024 at 05:37:48PM +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.
> 
> Thus introduce provide a generic mapping function which uses the
> irq_get_affinity callback from bus_type.
> 
> Originally idea from Ming Lei <ming.lei@redhat.com>
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming

Re: [PATCH v5 5/8] scsi: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[Ming Lei]

On Fri, Nov 15, 2024 at 05:37:49PM +0100, Daniel Wagner wrote:
> Replace all users of blk_mq_pci_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_pci_map_queues.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming

Re: [PATCH v5 6/8] nvme: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[Ming Lei]

On Fri, Nov 15, 2024 at 05:37:50PM +0100, Daniel Wagner wrote:
> Replace all users of blk_mq_pci_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_pci_map_queues.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming

Re: [PATCH v5 7/8] virtio: blk/scsi: replace blk_mq_virtio_map_queues with blk_mq_map_hw_queues

[Ming Lei]

On Fri, Nov 15, 2024 at 05:37:51PM +0100, Daniel Wagner wrote:
> Replace all users of blk_mq_virtio_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_virtio_map_queues.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming

Re: [PATCH v5 8/8] blk-mq: remove unused queue mapping helpers

[Ming Lei]

On Fri, Nov 15, 2024 at 05:37:52PM +0100, Daniel Wagner wrote:
> There are no users left of the pci and virtio queue mapping helpers.
> Thus remove them.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming

Re: [PATCH v5 2/8] PCI: hookup irq_get_affinity callback

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> struct bus_type has a new callback for retrieving the IRQ affinity for a
> device. Hook this callback up for PCI based devices.
> 
> Acked-by: Bjorn Helgaas<bhelgaas@google.com>
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Reviewed-by: Ming Lei<ming.lei@redhat.com>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>
> ---

Reviewed-by: John Garry <john.g.garry@oracle.com>

Re: [PATCH v5 3/8] virtio: hookup irq_get_affinity callback

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Reviewed-by: Ming Lei<ming.lei@redhat.com>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>

Reviewed-by: John Garry <john.g.garry@oracle.com>

> ---
>   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);
>   }
>   
> +/**

nit: does this really need to be kerneldoc, as it is static?

> + * 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 = {

Re: [PATCH v5 4/8] blk-mq: introduce blk_mq_map_hw_queues

[John Garry]

On 15/11/2024 16:37, 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.
> 
> Thus introduce provide a generic mapping function which uses the
> irq_get_affinity callback from bus_type.
> 
> Originally idea from Ming Lei <ming.lei@redhat.com>
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>

Just a couple of styling queries/comments, below:
Reviewed-by: John Garry <john.g.garry@oracle.com>

> ---
>   block/blk-mq-cpumap.c  | 37 +++++++++++++++++++++++++++++++++++++
>   include/linux/blk-mq.h |  2 ++
>   2 files changed, 39 insertions(+)
> 
> diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
> index 9638b25fd52124f0173e968ebdca5f1fe0b42ad9..0b65ffa5a183cc8e6697df4a16748eff15bfa8b3 100644
> --- a/block/blk-mq-cpumap.c
> +++ b/block/blk-mq-cpumap.c
> @@ -11,6 +11,7 @@
>   #include <linux/smp.h>
>   #include <linux/cpu.h>
>   #include <linux/group_cpus.h>
> +#include <linux/device/bus.h>
>   
>   #include "blk.h"
>   #include "blk-mq.h"
> @@ -54,3 +55,39 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index)
>   
>   	return NUMA_NO_NODE;
>   }
> +
> +/**
> + * blk_mq_map_hw_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.

supernit: maybe no '.'

> + *
> + * Create a CPU to hardware queue mapping in @qmap. The struct bus_type
> + * irq_get_affinity callback will be used to retrieve the affinity.
> + */
> +void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap,
> +			  struct device *dev, unsigned int offset)
> +
> +{
> +	const struct cpumask *mask;
> +	unsigned int queue, cpu;
> +
> +	if (!dev->bus->irq_get_affinity)
> +		goto fallback;
> +
> +	for (queue = 0; queue < qmap->nr_queues; queue++) {
> +		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_map_hw_queues);

is there still a blank line at the bottom of the file?

> diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
> index 2035fad3131fb60781957095ce8a3a941dd104be..05f544a9ed873d2f96d72c18e124c94146f6943f 100644
> --- a/include/linux/blk-mq.h
> +++ b/include/linux/blk-mq.h
> @@ -923,6 +923,8 @@ void blk_mq_unfreeze_queue_non_owner(struct request_queue *q);
>   void blk_freeze_queue_start_non_owner(struct request_queue *q);
>   
>   void blk_mq_map_queues(struct blk_mq_queue_map *qmap);
> +void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap,
> +			  struct device *dev, unsigned int offset);
>   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);
> 

Re: [PATCH v5 5/8] scsi: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> Replace all users of blk_mq_pci_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_pci_map_queues.
> 
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>


Reviewed-by: John Garry <john.g.garry@oracle.com>

Re: [PATCH v5 6/8] nvme: replace blk_mq_pci_map_queues with blk_mq_map_hw_queues

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> Replace all users of blk_mq_pci_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_pci_map_queues.
> 
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>

Reviewed-by: John Garry <john.g.garry@oracle.com>

Re: [PATCH v5 7/8] virtio: blk/scsi: replace blk_mq_virtio_map_queues with blk_mq_map_hw_queues

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> Replace all users of blk_mq_virtio_map_queues with the more generic
> blk_mq_map_hw_queues. This in preparation to retire
> blk_mq_virtio_map_queues.
> 
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>

Reviewed-by: John Garry <john.g.garry@oracle.com>

Re: [PATCH v5 8/8] blk-mq: remove unused queue mapping helpers

[John Garry]

On 15/11/2024 16:37, Daniel Wagner wrote:
> There are no users left of the pci and virtio queue mapping helpers.
> Thus remove them.
> 
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> Reviewed-by: Hannes Reinecke<hare@suse.de>
> Signed-off-by: Daniel Wagner<wagi@kernel.org>

Reviewed-by: John Garry <john.g.garry@oracle.com>

Re: [PATCH v5 3/8] virtio: hookup irq_get_affinity callback

[Daniel Wagner]

On Thu, Nov 21, 2024 at 09:01:49AM +0000, John Garry wrote:
> > --- 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);
> >   }
> > +/**
> 
> nit: does this really need to be kerneldoc, as it is static?

No, it's not necessary, I didn't know what the rules for static
functions are. I'll update it accordingly.

Re: [PATCH v5 4/8] blk-mq: introduce blk_mq_map_hw_queues

[Daniel Wagner]

On Thu, Nov 21, 2024 at 09:08:02AM +0000, John Garry wrote:
> > +/**
> > + * blk_mq_map_hw_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.
> 
> supernit: maybe no '.'

np. I've followed the style of the function right above. Dropped them.

> is there still a blank line at the bottom of the file?

It ends with (vim):

	}
	EXPORT_SYMBOL_GPL(blk_mq_map_hw_queues);
	~

I hope that is what it supposed to be.

Daniel