convert SCSI to atomic queue limits, part 1

convert SCSI to atomic queue limits, part 1

[Christoph Hellwig]

Hi all,

this series converts the SCSI midlayer and LLDDs to use atomic queue limits
API.  It is pretty straight forward, except for the mpt3mr driver which
does really weird and probably already broken things by setting limits
from unlocked device iteration callsbacks.

The first patch is actually a bug fix and should probably go into 6.9-rc.
The other would probably best be in a shared branch between the block and
scsi code, as the ULD drivers will be a lot more extensive.  I'm actually
scratching my head on dealing with some of the updates that it does from
the I/O completion handler and ->open calls for already open devices.
Suggestions welcome..

Diffstat:
 block/blk-settings.c                        |  248 ----------------------------
 block/bsg-lib.c                             |    6 
 drivers/ata/ahci.h                          |    2 
 drivers/ata/libata-sata.c                   |   10 -
 drivers/ata/libata-scsi.c                   |   19 +-
 drivers/ata/libata.h                        |    3 
 drivers/ata/pata_macio.c                    |   11 -
 drivers/ata/sata_mv.c                       |    2 
 drivers/ata/sata_nv.c                       |   24 +-
 drivers/ata/sata_sil24.c                    |    2 
 drivers/firewire/sbp2.c                     |   13 -
 drivers/message/fusion/mptfc.c              |    1 
 drivers/message/fusion/mptsas.c             |    1 
 drivers/message/fusion/mptscsih.c           |    2 
 drivers/message/fusion/mptspi.c             |    1 
 drivers/s390/block/dasd_eckd.c              |    6 
 drivers/scsi/aha152x.c                      |    8 
 drivers/scsi/aic94xx/aic94xx_init.c         |    2 
 drivers/scsi/hisi_sas/hisi_sas.h            |    3 
 drivers/scsi/hisi_sas/hisi_sas_main.c       |    7 
 drivers/scsi/hisi_sas/hisi_sas_v1_hw.c      |    2 
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c      |    2 
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c      |    7 
 drivers/scsi/hosts.c                        |    6 
 drivers/scsi/hptiop.c                       |    8 
 drivers/scsi/ibmvscsi/ibmvfc.c              |    5 
 drivers/scsi/imm.c                          |   12 -
 drivers/scsi/ipr.c                          |   10 -
 drivers/scsi/isci/init.c                    |    2 
 drivers/scsi/iscsi_tcp.c                    |    2 
 drivers/scsi/libsas/sas_scsi_host.c         |    7 
 drivers/scsi/megaraid/megaraid_sas.h        |    2 
 drivers/scsi/megaraid/megaraid_sas_base.c   |   29 +--
 drivers/scsi/megaraid/megaraid_sas_fusion.c |    3 
 drivers/scsi/mpi3mr/mpi3mr.h                |    1 
 drivers/scsi/mpi3mr/mpi3mr_app.c            |   12 -
 drivers/scsi/mpi3mr/mpi3mr_os.c             |   76 +++-----
 drivers/scsi/mpt3sas/mpt3sas_scsih.c        |   18 --
 drivers/scsi/mvsas/mv_init.c                |    2 
 drivers/scsi/pm8001/pm8001_init.c           |    2 
 drivers/scsi/pmcraid.c                      |   11 -
 drivers/scsi/ppa.c                          |    8 
 drivers/scsi/qla2xxx/qla_os.c               |    6 
 drivers/scsi/scsi_lib.c                     |   40 +---
 drivers/scsi/scsi_scan.c                    |   79 ++++----
 drivers/scsi/scsi_transport_fc.c            |   15 +
 drivers/scsi/scsi_transport_iscsi.c         |    6 
 drivers/scsi/scsi_transport_sas.c           |    4 
 drivers/staging/rts5208/rtsx.c              |   24 +-
 drivers/ufs/core/ufs_bsg.c                  |    3 
 drivers/ufs/core/ufshcd.c                   |    3 
 drivers/ufs/host/ufs-exynos.c               |    8 
 drivers/usb/image/microtek.c                |    8 
 drivers/usb/storage/scsiglue.c              |   57 ++----
 drivers/usb/storage/uas.c                   |   29 +--
 drivers/usb/storage/usb.c                   |   10 +
 include/linux/blkdev.h                      |   13 -
 include/linux/bsg-lib.h                     |    3 
 include/linux/libata.h                      |   10 -
 include/linux/mmc/host.h                    |    4 
 include/scsi/libsas.h                       |    3 
 include/scsi/scsi_host.h                    |    9 +
 include/scsi/scsi_transport.h               |    2 
 include/scsi/scsi_transport_fc.h            |    1 
 include/ufs/ufshcd.h                        |    1 
 65 files changed, 335 insertions(+), 601 deletions(-)

[PATCH 01/23] block: don't reject too large max_user_setors in blk_validate_limits

[Christoph Hellwig]

We already cap down the actual max_sectors to the max of the hardware
and user limit, so don't reject the configuration.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-settings.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 3c7d8d638ab59d..cdbaef159c4bc3 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -146,8 +146,7 @@ static int blk_validate_limits(struct queue_limits *lim)
 	max_hw_sectors = min_not_zero(lim->max_hw_sectors,
 				lim->max_dev_sectors);
 	if (lim->max_user_sectors) {
-		if (lim->max_user_sectors > max_hw_sectors ||
-		    lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)
+		if (lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)
 			return -EINVAL;
 		lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors);
 	} else {
-- 
2.39.2

[PATCH 02/23] bsg: pass queue_limits to bsg_setup_queue

[Christoph Hellwig]

This allows bsg_setup_queue to pass them to blk_mq_alloc_queue and thus
set up the limits at queue allocation time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/bsg-lib.c                     | 6 ++++--
 drivers/scsi/mpi3mr/mpi3mr_app.c    | 2 +-
 drivers/scsi/scsi_transport_fc.c    | 6 +++---
 drivers/scsi/scsi_transport_iscsi.c | 3 ++-
 drivers/scsi/scsi_transport_sas.c   | 4 ++--
 drivers/ufs/core/ufs_bsg.c          | 3 ++-
 include/linux/bsg-lib.h             | 3 ++-
 7 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index bcc7dee6abced6..ee738d129a9f5e 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -354,12 +354,14 @@ static const struct blk_mq_ops bsg_mq_ops = {
  * bsg_setup_queue - Create and add the bsg hooks so we can receive requests
  * @dev: device to attach bsg device to
  * @name: device to give bsg device
+ * @lim: queue limits for the bsg queue
  * @job_fn: bsg job handler
  * @timeout: timeout handler function pointer
  * @dd_job_size: size of LLD data needed for each job
  */
 struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
-		bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size)
+		struct queue_limits *lim, bsg_job_fn *job_fn,
+		bsg_timeout_fn *timeout, int dd_job_size)
 {
 	struct bsg_set *bset;
 	struct blk_mq_tag_set *set;
@@ -383,7 +385,7 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
 	if (blk_mq_alloc_tag_set(set))
 		goto out_tag_set;
 
-	q = blk_mq_alloc_queue(set, NULL, NULL);
+	q = blk_mq_alloc_queue(set, lim, NULL);
 	if (IS_ERR(q)) {
 		ret = PTR_ERR(q);
 		goto out_queue;
diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 0380996b5ad27a..0bac3f49d8057d 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -1853,7 +1853,7 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc)
 		return;
 	}
 
-	mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev),
+	mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), NULL,
 			mpi3mr_bsg_request, NULL, 0);
 	if (IS_ERR(mrioc->bsg_queue)) {
 		ioc_err(mrioc, "%s: bsg registration failed\n",
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index b04075f19445dc..87b2235b8ece45 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -4287,8 +4287,8 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 	snprintf(bsg_name, sizeof(bsg_name),
 		 "fc_host%d", shost->host_no);
 
-	q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
-				i->f->dd_bsg_size);
+	q = bsg_setup_queue(dev, bsg_name, NULL, fc_bsg_dispatch,
+			fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
 		dev_err(dev,
 			"fc_host%d: bsg interface failed to initialize - setup queue\n",
@@ -4318,7 +4318,7 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
 	if (!i->f->bsg_request)
 		return -ENOTSUPP;
 
-	q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
+	q = bsg_setup_queue(dev, dev_name(dev), NULL, fc_bsg_dispatch_prep,
 				fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
 		dev_err(dev, "failed to setup bsg queue\n");
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index af3ac6346796ba..c131746bf20777 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1542,7 +1542,8 @@ iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 		return -ENOTSUPP;
 
 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
-	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
+	q = bsg_setup_queue(dev, bsg_name, NULL, iscsi_bsg_host_dispatch, NULL,
+			0);
 	if (IS_ERR(q)) {
 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
 			     "initialize - no request queue\n");
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index d704c484a251c5..424a89513814b4 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -197,7 +197,7 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 	}
 
 	if (rphy) {
-		q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
+		q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev), NULL,
 				sas_smp_dispatch, NULL, 0);
 		if (IS_ERR(q))
 			return PTR_ERR(q);
@@ -206,7 +206,7 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 		char name[20];
 
 		snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
-		q = bsg_setup_queue(&shost->shost_gendev, name,
+		q = bsg_setup_queue(&shost->shost_gendev, name, NULL,
 				sas_smp_dispatch, NULL, 0);
 		if (IS_ERR(q))
 			return PTR_ERR(q);
diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
index 374e5aae4e7e86..433d0480391ea6 100644
--- a/drivers/ufs/core/ufs_bsg.c
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -253,7 +253,8 @@ int ufs_bsg_probe(struct ufs_hba *hba)
 	if (ret)
 		goto out;
 
-	q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), ufs_bsg_request, NULL, 0);
+	q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), NULL, ufs_bsg_request,
+			NULL, 0);
 	if (IS_ERR(q)) {
 		ret = PTR_ERR(q);
 		goto out;
diff --git a/include/linux/bsg-lib.h b/include/linux/bsg-lib.h
index 9e97ced2896df2..14fa93268630ed 100644
--- a/include/linux/bsg-lib.h
+++ b/include/linux/bsg-lib.h
@@ -65,7 +65,8 @@ struct bsg_job {
 void bsg_job_done(struct bsg_job *job, int result,
 		  unsigned int reply_payload_rcv_len);
 struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
-		bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size);
+		struct queue_limits *lim, bsg_job_fn *job_fn,
+		bsg_timeout_fn *timeout, int dd_job_size);
 void bsg_remove_queue(struct request_queue *q);
 void bsg_job_put(struct bsg_job *job);
 int __must_check bsg_job_get(struct bsg_job *job);
-- 
2.39.2

[PATCH 03/23] mpi3mr: pass queue_limits to bsg_setup_queue

[Christoph Hellwig]

Pass the limits to bsg_setup_queue instead of setting them up on the live
queue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/mpi3mr/mpi3mr_app.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 0bac3f49d8057d..1dd097f9d7b78c 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -1838,6 +1838,10 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc)
 {
 	struct device *bsg_dev = &mrioc->bsg_dev;
 	struct device *parent = &mrioc->shost->shost_gendev;
+	struct queue_limits lim = {
+		.max_hw_sectors		= MPI3MR_MAX_APP_XFER_SECTORS,
+		.max_segments		= MPI3MR_MAX_APP_XFER_SEGMENTS,
+	};
 
 	device_initialize(bsg_dev);
 
@@ -1853,20 +1857,14 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc)
 		return;
 	}
 
-	mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), NULL,
+	mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), &lim,
 			mpi3mr_bsg_request, NULL, 0);
 	if (IS_ERR(mrioc->bsg_queue)) {
 		ioc_err(mrioc, "%s: bsg registration failed\n",
 		    dev_name(bsg_dev));
 		device_del(bsg_dev);
 		put_device(bsg_dev);
-		return;
 	}
-
-	blk_queue_max_segments(mrioc->bsg_queue, MPI3MR_MAX_APP_XFER_SEGMENTS);
-	blk_queue_max_hw_sectors(mrioc->bsg_queue, MPI3MR_MAX_APP_XFER_SECTORS);
-
-	return;
 }
 
 /**
-- 
2.39.2

[PATCH 04/23] scsi: initialize scsi midlayer limits before allocating the queue

[Christoph Hellwig]

Turn __scsi_init_queue into scsi_init_limits which initializes
queue_limits structure that can be passed to blk_mq_alloc_queue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/scsi_lib.c             | 32 ++++++++++++++---------------
 drivers/scsi/scsi_scan.c            |  5 +++--
 drivers/scsi/scsi_transport_fc.c    | 11 +++++-----
 drivers/scsi/scsi_transport_iscsi.c |  5 +++--
 include/scsi/scsi_transport.h       |  2 +-
 5 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2e28e2360c8574..1deca84914e87a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -32,7 +32,7 @@
 #include <scsi/scsi_driver.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_host.h>
-#include <scsi/scsi_transport.h> /* __scsi_init_queue() */
+#include <scsi/scsi_transport.h> /* scsi_init_limits() */
 #include <scsi/scsi_dh.h>
 
 #include <trace/events/scsi.h>
@@ -1965,31 +1965,26 @@ static void scsi_map_queues(struct blk_mq_tag_set *set)
 	blk_mq_map_queues(&set->map[HCTX_TYPE_DEFAULT]);
 }
 
-void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
+void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim)
 {
 	struct device *dev = shost->dma_dev;
 
-	/*
-	 * this limit is imposed by hardware restrictions
-	 */
-	blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
-					SG_MAX_SEGMENTS));
+	memset(lim, 0, sizeof(*lim));
+	lim->max_segments =
+		min_t(unsigned short, shost->sg_tablesize, SG_MAX_SEGMENTS);
 
 	if (scsi_host_prot_dma(shost)) {
 		shost->sg_prot_tablesize =
 			min_not_zero(shost->sg_prot_tablesize,
 				     (unsigned short)SCSI_MAX_PROT_SG_SEGMENTS);
 		BUG_ON(shost->sg_prot_tablesize < shost->sg_tablesize);
-		blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize);
+		lim->max_integrity_segments = shost->sg_prot_tablesize;
 	}
 
-	blk_queue_max_hw_sectors(q, shost->max_sectors);
-	blk_queue_segment_boundary(q, shost->dma_boundary);
-	dma_set_seg_boundary(dev, shost->dma_boundary);
-
-	blk_queue_max_segment_size(q, shost->max_segment_size);
-	blk_queue_virt_boundary(q, shost->virt_boundary_mask);
-	dma_set_max_seg_size(dev, queue_max_segment_size(q));
+	lim->max_hw_sectors = shost->max_sectors;
+	lim->seg_boundary_mask = shost->dma_boundary;
+	lim->max_segment_size = shost->max_segment_size;
+	lim->virt_boundary_mask = shost->virt_boundary_mask;
 
 	/*
 	 * Set a reasonable default alignment:  The larger of 32-byte (dword),
@@ -1998,9 +1993,12 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
 	 *
 	 * Devices that require a bigger alignment can increase it later.
 	 */
-	blk_queue_dma_alignment(q, max(4, dma_get_cache_alignment()) - 1);
+	lim->dma_alignment = max(4, dma_get_cache_alignment()) - 1;
+
+	dma_set_seg_boundary(dev, shost->dma_boundary);
+	dma_set_max_seg_size(dev, shost->max_segment_size);
 }
-EXPORT_SYMBOL_GPL(__scsi_init_queue);
+EXPORT_SYMBOL_GPL(scsi_init_limits);
 
 static const struct blk_mq_ops scsi_mq_ops_no_commit = {
 	.get_budget	= scsi_mq_get_budget,
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 8d06475de17a33..205ab3b3ea89be 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -283,6 +283,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 	struct request_queue *q;
 	int display_failure_msg = 1, ret;
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct queue_limits lim;
 
 	sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
 		       GFP_KERNEL);
@@ -332,7 +333,8 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 
 	sdev->sg_reserved_size = INT_MAX;
 
-	q = blk_mq_alloc_queue(&sdev->host->tag_set, NULL, NULL);
+	scsi_init_limits(shost, &lim);
+	q = blk_mq_alloc_queue(&sdev->host->tag_set, &lim, NULL);
 	if (IS_ERR(q)) {
 		/* release fn is set up in scsi_sysfs_device_initialise, so
 		 * have to free and put manually here */
@@ -343,7 +345,6 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 	kref_get(&sdev->host->tagset_refcnt);
 	sdev->request_queue = q;
 	q->queuedata = sdev;
-	__scsi_init_queue(sdev->host, q);
 
 	depth = sdev->host->cmd_per_lun ?: 1;
 
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 87b2235b8ece45..0799700b0fca77 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -4276,6 +4276,7 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 {
 	struct device *dev = &shost->shost_gendev;
 	struct fc_internal *i = to_fc_internal(shost->transportt);
+	struct queue_limits lim;
 	struct request_queue *q;
 	char bsg_name[20];
 
@@ -4286,8 +4287,8 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 
 	snprintf(bsg_name, sizeof(bsg_name),
 		 "fc_host%d", shost->host_no);
-
-	q = bsg_setup_queue(dev, bsg_name, NULL, fc_bsg_dispatch,
+	scsi_init_limits(shost, &lim);
+	q = bsg_setup_queue(dev, bsg_name, &lim, fc_bsg_dispatch,
 			fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
 		dev_err(dev,
@@ -4295,7 +4296,6 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 			shost->host_no);
 		return PTR_ERR(q);
 	}
-	__scsi_init_queue(shost, q);
 	blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
 	fc_host->rqst_q = q;
 	return 0;
@@ -4311,6 +4311,7 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
 {
 	struct device *dev = &rport->dev;
 	struct fc_internal *i = to_fc_internal(shost->transportt);
+	struct queue_limits lim;
 	struct request_queue *q;
 
 	rport->rqst_q = NULL;
@@ -4318,13 +4319,13 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
 	if (!i->f->bsg_request)
 		return -ENOTSUPP;
 
-	q = bsg_setup_queue(dev, dev_name(dev), NULL, fc_bsg_dispatch_prep,
+	scsi_init_limits(shost, &lim);
+	q = bsg_setup_queue(dev, dev_name(dev), &lim, fc_bsg_dispatch_prep,
 				fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
 		dev_err(dev, "failed to setup bsg queue\n");
 		return PTR_ERR(q);
 	}
-	__scsi_init_queue(shost, q);
 	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
 	rport->rqst_q = q;
 	return 0;
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index c131746bf20777..5e1bb488da15c0 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1535,6 +1535,7 @@ iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 {
 	struct device *dev = &shost->shost_gendev;
 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+	struct queue_limits lim;
 	struct request_queue *q;
 	char bsg_name[20];
 
@@ -1542,14 +1543,14 @@ iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 		return -ENOTSUPP;
 
 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
-	q = bsg_setup_queue(dev, bsg_name, NULL, iscsi_bsg_host_dispatch, NULL,
+	scsi_init_limits(shost, &lim);
+	q = bsg_setup_queue(dev, bsg_name, &lim, iscsi_bsg_host_dispatch, NULL,
 			0);
 	if (IS_ERR(q)) {
 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
 			     "initialize - no request queue\n");
 		return PTR_ERR(q);
 	}
-	__scsi_init_queue(shost, q);
 
 	ihost->bsg_q = q;
 	return 0;
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index a0458bda314872..1394cf313bb37c 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -83,6 +83,6 @@ scsi_transport_device_data(struct scsi_device *sdev)
 		+ shost->transportt->device_private_offset;
 }
 
-void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q);
+void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim);
 
 #endif /* SCSI_TRANSPORT_H */
-- 
2.39.2

[PATCH 05/23] scsi_transport_fc: add a max_bsg_segments field to struct fc_function_template

[Christoph Hellwig]

ibmvfc only supports a single segment for BSG FC passthrough.  Instead of
having it set a queue limits after creating the BSD queues, add a field so
that the FC transport can set it before allocating the queue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/ibmvscsi/ibmvfc.c   | 5 +----
 drivers/scsi/scsi_transport_fc.c | 2 ++
 include/scsi/scsi_transport_fc.h | 1 +
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 05b126bfd18b55..a3d1013c83075c 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -5541,8 +5541,6 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
 			rport->supported_classes |= FC_COS_CLASS2;
 		if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
 			rport->supported_classes |= FC_COS_CLASS3;
-		if (rport->rqst_q)
-			blk_queue_max_segments(rport->rqst_q, 1);
 	} else
 		tgt_dbg(tgt, "rport add failed\n");
 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
@@ -6391,8 +6389,6 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 
 	ibmvfc_init_sub_crqs(vhost);
 
-	if (shost_to_fc_host(shost)->rqst_q)
-		blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
 	dev_set_drvdata(dev, vhost);
 	spin_lock(&ibmvfc_driver_lock);
 	list_add_tail(&vhost->queue, &ibmvfc_head);
@@ -6547,6 +6543,7 @@ static struct fc_function_template ibmvfc_transport_functions = {
 	.get_starget_port_id = ibmvfc_get_starget_port_id,
 	.show_starget_port_id = 1,
 
+	.max_bsg_segments = 1,
 	.bsg_request = ibmvfc_bsg_request,
 	.bsg_timeout = ibmvfc_bsg_timeout,
 };
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 0799700b0fca77..7d088b8da07578 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -4288,6 +4288,7 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 	snprintf(bsg_name, sizeof(bsg_name),
 		 "fc_host%d", shost->host_no);
 	scsi_init_limits(shost, &lim);
+	lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
 	q = bsg_setup_queue(dev, bsg_name, &lim, fc_bsg_dispatch,
 			fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
@@ -4320,6 +4321,7 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
 		return -ENOTSUPP;
 
 	scsi_init_limits(shost, &lim);
+	lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
 	q = bsg_setup_queue(dev, dev_name(dev), &lim, fc_bsg_dispatch_prep,
 				fc_bsg_job_timeout, i->f->dd_bsg_size);
 	if (IS_ERR(q)) {
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 483513c575976c..fd039306ffbb20 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -709,6 +709,7 @@ struct fc_function_template {
 	int  	(*vport_delete)(struct fc_vport *);
 
 	/* bsg support */
+	u32				max_bsg_segments;
 	int	(*bsg_request)(struct bsg_job *);
 	int	(*bsg_timeout)(struct bsg_job *);
 
-- 
2.39.2

[PATCH 06/23] scsi: add a no_highmem flag to struct Scsi_Host

[Christoph Hellwig]

While we really should be killing the block layer bounce buffering ASAP,
I even more urgently need to stop the drivers to fiddle with the limits
from ->slave_configure.  Add a no_highmem flag to the Scsi_Host to
centralize this setting and switch the remaining four drivers that use
block layer bounce buffering to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/aha152x.c         |  8 +-------
 drivers/scsi/imm.c             | 12 +-----------
 drivers/scsi/ppa.c             |  8 +-------
 drivers/scsi/scsi_lib.c        |  3 +++
 drivers/usb/storage/scsiglue.c | 10 ----------
 drivers/usb/storage/usb.c      | 10 ++++++++++
 include/scsi/scsi_host.h       |  2 ++
 7 files changed, 18 insertions(+), 35 deletions(-)

diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index 055adb349b0e41..83f16fc14d9630 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -746,6 +746,7 @@ struct Scsi_Host *aha152x_probe_one(struct aha152x_setup *setup)
 	/* need to have host registered before triggering any interrupt */
 	list_add_tail(&HOSTDATA(shpnt)->host_list, &aha152x_host_list);
 
+	shpnt->no_highmem = true;
 	shpnt->io_port   = setup->io_port;
 	shpnt->n_io_port = IO_RANGE;
 	shpnt->irq       = setup->irq;
@@ -2940,12 +2941,6 @@ static int aha152x_show_info(struct seq_file *m, struct Scsi_Host *shpnt)
 	return 0;
 }
 
-static int aha152x_adjust_queue(struct scsi_device *device)
-{
-	blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
-	return 0;
-}
-
 static const struct scsi_host_template aha152x_driver_template = {
 	.module				= THIS_MODULE,
 	.name				= AHA152X_REVID,
@@ -2961,7 +2956,6 @@ static const struct scsi_host_template aha152x_driver_template = {
 	.this_id			= 7,
 	.sg_tablesize			= SG_ALL,
 	.dma_boundary			= PAGE_SIZE - 1,
-	.slave_alloc			= aha152x_adjust_queue,
 	.cmd_size			= sizeof(struct aha152x_cmd_priv),
 };
 
diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c
index 180a5ddedb2cda..21339da505f1ea 100644
--- a/drivers/scsi/imm.c
+++ b/drivers/scsi/imm.c
@@ -1100,16 +1100,6 @@ static int device_check(imm_struct *dev, bool autodetect)
 	return -ENODEV;
 }
 
-/*
- * imm cannot deal with highmem, so this causes all IO pages for this host
- * to reside in low memory (hence mapped)
- */
-static int imm_adjust_queue(struct scsi_device *device)
-{
-	blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
-	return 0;
-}
-
 static const struct scsi_host_template imm_template = {
 	.module			= THIS_MODULE,
 	.proc_name		= "imm",
@@ -1123,7 +1113,6 @@ static const struct scsi_host_template imm_template = {
 	.this_id		= 7,
 	.sg_tablesize		= SG_ALL,
 	.can_queue		= 1,
-	.slave_alloc		= imm_adjust_queue,
 	.cmd_size		= sizeof(struct scsi_pointer),
 };
 
@@ -1235,6 +1224,7 @@ static int __imm_attach(struct parport *pb)
 	host = scsi_host_alloc(&imm_template, sizeof(imm_struct *));
 	if (!host)
 		goto out1;
+	host->no_highmem = true;
 	host->io_port = pb->base;
 	host->n_io_port = ports;
 	host->dma_channel = -1;
diff --git a/drivers/scsi/ppa.c b/drivers/scsi/ppa.c
index d592ee9170c11f..8300f0bdddb37a 100644
--- a/drivers/scsi/ppa.c
+++ b/drivers/scsi/ppa.c
@@ -986,12 +986,6 @@ static int device_check(ppa_struct *dev, bool autodetect)
 	return -ENODEV;
 }
 
-static int ppa_adjust_queue(struct scsi_device *device)
-{
-	blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
-	return 0;
-}
-
 static const struct scsi_host_template ppa_template = {
 	.module			= THIS_MODULE,
 	.proc_name		= "ppa",
@@ -1005,7 +999,6 @@ static const struct scsi_host_template ppa_template = {
 	.this_id		= -1,
 	.sg_tablesize		= SG_ALL,
 	.can_queue		= 1,
-	.slave_alloc		= ppa_adjust_queue,
 	.cmd_size		= sizeof(struct scsi_pointer),
 };
 
@@ -1111,6 +1104,7 @@ static int __ppa_attach(struct parport *pb)
 	host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
 	if (!host)
 		goto out1;
+	host->no_highmem = true;
 	host->io_port = pb->base;
 	host->n_io_port = ports;
 	host->dma_channel = -1;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 1deca84914e87a..f1936f98abe3e2 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1995,6 +1995,9 @@ void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim)
 	 */
 	lim->dma_alignment = max(4, dma_get_cache_alignment()) - 1;
 
+	if (shost->no_highmem)
+		lim->bounce = BLK_BOUNCE_HIGH;
+
 	dma_set_seg_boundary(dev, shost->dma_boundary);
 	dma_set_max_seg_size(dev, shost->max_segment_size);
 }
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 12cf9940e5b675..1d14c678f3d3e3 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -40,7 +40,6 @@
 #include <scsi/scsi_eh.h>
 
 #include "usb.h"
-#include <linux/usb/hcd.h>
 #include "scsiglue.h"
 #include "debug.h"
 #include "transport.h"
@@ -130,15 +129,6 @@ static int slave_configure(struct scsi_device *sdev)
 		min_t(size_t, queue_max_hw_sectors(sdev->request_queue),
 		      dma_max_mapping_size(dev) >> SECTOR_SHIFT));
 
-	/*
-	 * Some USB host controllers can't do DMA; they have to use PIO.
-	 * For such controllers we need to make sure the block layer sets
-	 * up bounce buffers in addressable memory.
-	 */
-	if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) ||
-			(bus_to_hcd(us->pusb_dev->bus)->localmem_pool != NULL))
-		blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
-
 	/*
 	 * We can't put these settings in slave_alloc() because that gets
 	 * called before the device type is known.  Consequently these
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index d1ad6a2509ab7f..a49a31639f6f0c 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -47,6 +47,7 @@
 #include <scsi/scsi_device.h>
 
 #include "usb.h"
+#include <linux/usb/hcd.h>
 #include "scsiglue.h"
 #include "transport.h"
 #include "protocol.h"
@@ -961,6 +962,15 @@ int usb_stor_probe1(struct us_data **pus,
 	if (result)
 		goto BadDevice;
 
+	/*
+	 * Some USB host controllers can't do DMA; they have to use PIO.
+	 * For such controllers we need to make sure the block layer sets
+	 * up bounce buffers in addressable memory.
+	 */
+	if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) ||
+	    bus_to_hcd(us->pusb_dev->bus)->localmem_pool)
+		host->no_highmem = true;
+
 	/* Get the unusual_devs entries and the descriptors */
 	result = get_device_info(us, id, unusual_dev);
 	if (result)
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b259d42a1e1aff..6d77c48e8311fb 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -665,6 +665,8 @@ struct Scsi_Host {
 	/* The transport requires the LUN bits NOT to be stored in CDB[1] */
 	unsigned no_scsi2_lun_in_cdb:1;
 
+	unsigned no_highmem:1;
+
 	/*
 	 * Optional work queue to be utilized by the transport
 	 */
-- 
2.39.2

[PATCH 07/23] scsi: add a dma_alignment field to the host and host template

[Christoph Hellwig]

Get drivers out of the business of having to call the block layer
dma alignment limits helpers themselves.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/firewire/sbp2.c           |  6 ------
 drivers/message/fusion/mptfc.c    |  1 +
 drivers/message/fusion/mptsas.c   |  1 +
 drivers/message/fusion/mptscsih.c |  2 --
 drivers/message/fusion/mptspi.c   |  1 +
 drivers/scsi/hosts.c              |  6 ++++++
 drivers/scsi/iscsi_tcp.c          |  2 +-
 drivers/scsi/qla2xxx/qla_os.c     |  6 +++---
 drivers/scsi/scsi_lib.c           | 11 ++---------
 drivers/staging/rts5208/rtsx.c    | 24 ++++++++++++------------
 drivers/usb/image/microtek.c      |  8 +-------
 drivers/usb/storage/scsiglue.c    | 11 +++++------
 drivers/usb/storage/uas.c         | 13 ++++++-------
 include/scsi/scsi_host.h          |  3 +++
 14 files changed, 42 insertions(+), 53 deletions(-)

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index e779d866022b9f..8f7810b2a4c10f 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1500,12 +1500,6 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 
 	sdev->allow_restart = 1;
 
-	/*
-	 * SBP-2 does not require any alignment, but we set it anyway
-	 * for compatibility with earlier versions of this driver.
-	 */
-	blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
-
 	if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
 		sdev->inquiry_len = 36;
 
diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c
index c459f709107b7c..a3c17c4fe69c54 100644
--- a/drivers/message/fusion/mptfc.c
+++ b/drivers/message/fusion/mptfc.c
@@ -129,6 +129,7 @@ static const struct scsi_host_template mptfc_driver_template = {
 	.sg_tablesize			= MPT_SCSI_SG_DEPTH,
 	.max_sectors			= 8192,
 	.cmd_per_lun			= 7,
+	.dma_alignment			= 511,
 	.shost_groups			= mptscsih_host_attr_groups,
 };
 
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 300f8e955a5319..30cb4f64e77047 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -2020,6 +2020,7 @@ static const struct scsi_host_template mptsas_driver_template = {
 	.sg_tablesize			= MPT_SCSI_SG_DEPTH,
 	.max_sectors			= 8192,
 	.cmd_per_lun			= 7,
+	.dma_alignment			= 511,
 	.shost_groups			= mptscsih_host_attr_groups,
 	.no_write_same			= 1,
 };
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 9080a73b4ea64a..6c3f25cc33ff99 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -2438,8 +2438,6 @@ mptscsih_slave_configure(struct scsi_device *sdev)
 		"tagged %d, simple %d\n",
 		ioc->name,sdev->tagged_supported, sdev->simple_tags));
 
-	blk_queue_dma_alignment (sdev->request_queue, 512 - 1);
-
 	return 0;
 }
 
diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
index 6c5920db1e9dc5..574b882c9a8540 100644
--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -843,6 +843,7 @@ static const struct scsi_host_template mptspi_driver_template = {
 	.sg_tablesize			= MPT_SCSI_SG_DEPTH,
 	.max_sectors			= 8192,
 	.cmd_per_lun			= 7,
+	.dma_alignment			= 511,
 	.shost_groups			= mptscsih_host_attr_groups,
 };
 
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 4f495a41ec4aae..a67a98bd7ae2d7 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -478,6 +478,12 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
 	else
 		shost->max_segment_size = BLK_MAX_SEGMENT_SIZE;
 
+	/* 32-byte (dword) is a common minimum for HBAs. */
+	if (sht->dma_alignment)
+		shost->dma_alignment = sht->dma_alignment;
+	else
+		shost->dma_alignment = 3;
+
 	/*
 	 * assume a 4GB boundary, if not set
 	 */
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 8e14cea15f9808..60688f18fac6f7 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -943,6 +943,7 @@ iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
 	shost->max_id = 0;
 	shost->max_channel = 0;
 	shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
+	shost->dma_alignment = 0;
 
 	rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
 	if (rc < 0)
@@ -1065,7 +1066,6 @@ static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
 	if (conn->datadgst_en)
 		blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
 				   sdev->request_queue);
-	blk_queue_dma_alignment(sdev->request_queue, 0);
 	return 0;
 }
 
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index dd674378f2f392..d188749f29e407 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -1957,9 +1957,6 @@ qla2xxx_slave_configure(struct scsi_device *sdev)
 	scsi_qla_host_t *vha = shost_priv(sdev->host);
 	struct req_que *req = vha->req;
 
-	if (IS_T10_PI_CAPABLE(vha->hw))
-		blk_queue_update_dma_alignment(sdev->request_queue, 0x7);
-
 	scsi_change_queue_depth(sdev, req->max_q_depth);
 	return 0;
 }
@@ -3575,6 +3572,9 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		    QLA_SG_ALL : 128;
 	}
 
+	if (IS_T10_PI_CAPABLE(base_vha->hw))
+		host->dma_alignment = 0x7;
+
 	ret = scsi_add_host(host, &pdev->dev);
 	if (ret)
 		goto probe_failed;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index f1936f98abe3e2..26b51406c477e3 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1985,15 +1985,8 @@ void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim)
 	lim->seg_boundary_mask = shost->dma_boundary;
 	lim->max_segment_size = shost->max_segment_size;
 	lim->virt_boundary_mask = shost->virt_boundary_mask;
-
-	/*
-	 * Set a reasonable default alignment:  The larger of 32-byte (dword),
-	 * which is a common minimum for HBAs, and the minimum DMA alignment,
-	 * which is set by the platform.
-	 *
-	 * Devices that require a bigger alignment can increase it later.
-	 */
-	lim->dma_alignment = max(4, dma_get_cache_alignment()) - 1;
+	lim->dma_alignment = max_t(unsigned int,
+		shost->dma_alignment, dma_get_cache_alignment() - 1);
 
 	if (shost->no_highmem)
 		lim->bounce = BLK_BOUNCE_HIGH;
diff --git a/drivers/staging/rts5208/rtsx.c b/drivers/staging/rts5208/rtsx.c
index 86d32e3b3282a5..c4f54c311d0549 100644
--- a/drivers/staging/rts5208/rtsx.c
+++ b/drivers/staging/rts5208/rtsx.c
@@ -70,18 +70,6 @@ static int slave_alloc(struct scsi_device *sdev)
 
 static int slave_configure(struct scsi_device *sdev)
 {
-	/*
-	 * Scatter-gather buffers (all but the last) must have a length
-	 * divisible by the bulk maxpacket size.  Otherwise a data packet
-	 * would end up being short, causing a premature end to the data
-	 * transfer.  Since high-speed bulk pipes have a maxpacket size
-	 * of 512, we'll use that as the scsi device queue's DMA alignment
-	 * mask.  Guaranteeing proper alignment of the first buffer will
-	 * have the desired effect because, except at the beginning and
-	 * the end, scatter-gather buffers follow page boundaries.
-	 */
-	blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
-
 	/* Set the SCSI level to at least 2.  We'll leave it at 3 if that's
 	 * what is originally reported.  We need this to avoid confusing
 	 * the SCSI layer with devices that report 0 or 1, but need 10-byte
@@ -219,6 +207,18 @@ static const struct scsi_host_template rtsx_host_template = {
 	/* limit the total size of a transfer to 120 KB */
 	.max_sectors =                  240,
 
+	/*
+	 * Scatter-gather buffers (all but the last) must have a length
+	 * divisible by the bulk maxpacket size.  Otherwise a data packet
+	 * would end up being short, causing a premature end to the data
+	 * transfer.  Since high-speed bulk pipes have a maxpacket size
+	 * of 512, we'll use that as the scsi device queue's DMA alignment
+	 * mask.  Guaranteeing proper alignment of the first buffer will
+	 * have the desired effect because, except at the beginning and
+	 * the end, scatter-gather buffers follow page boundaries.
+	 */
+	.dma_alignment =		511,
+
 	/* emulated HBA */
 	.emulated =			1,
 
diff --git a/drivers/usb/image/microtek.c b/drivers/usb/image/microtek.c
index 8c8fa71c69c411..9f758241d9d376 100644
--- a/drivers/usb/image/microtek.c
+++ b/drivers/usb/image/microtek.c
@@ -328,12 +328,6 @@ static int mts_slave_alloc (struct scsi_device *s)
 	return 0;
 }
 
-static int mts_slave_configure (struct scsi_device *s)
-{
-	blk_queue_dma_alignment(s->request_queue, (512 - 1));
-	return 0;
-}
-
 static int mts_scsi_abort(struct scsi_cmnd *srb)
 {
 	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
@@ -631,8 +625,8 @@ static const struct scsi_host_template mts_scsi_host_template = {
 	.can_queue =		1,
 	.this_id =		-1,
 	.emulated =		1,
+	.dma_alignment =	511,
 	.slave_alloc =		mts_slave_alloc,
-	.slave_configure =	mts_slave_configure,
 	.max_sectors=		256, /* 128 K */
 };
 
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 1d14c678f3d3e3..eb4ba03e082d89 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -75,12 +75,6 @@ static int slave_alloc (struct scsi_device *sdev)
 	 */
 	sdev->inquiry_len = 36;
 
-	/*
-	 * Some host controllers may have alignment requirements.
-	 * We'll play it safe by requiring 512-byte alignment always.
-	 */
-	blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
-
 	/* Tell the SCSI layer if we know there is more than one LUN */
 	if (us->protocol == USB_PR_BULK && us->max_lun > 0)
 		sdev->sdev_bflags |= BLIST_FORCELUN;
@@ -638,6 +632,11 @@ static const struct scsi_host_template usb_stor_host_template = {
 	/* lots of sg segments can be handled */
 	.sg_tablesize =			SG_MAX_SEGMENTS,
 
+	/*
+	 * Some host controllers may have alignment requirements.
+	 * We'll play it safe by requiring 512-byte alignment always.
+	 */
+	.dma_alignment =		511,
 
 	/*
 	 * Limit the total size of a transfer to 120 KB.
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 71ace274761f18..0668182e1c469c 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -824,13 +824,6 @@ static int uas_slave_alloc(struct scsi_device *sdev)
 
 	sdev->hostdata = devinfo;
 
-	/*
-	 * The protocol has no requirements on alignment in the strict sense.
-	 * Controllers may or may not have alignment restrictions.
-	 * As this is not exported, we use an extremely conservative guess.
-	 */
-	blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
-
 	if (devinfo->flags & US_FL_MAX_SECTORS_64)
 		blk_queue_max_hw_sectors(sdev->request_queue, 64);
 	else if (devinfo->flags & US_FL_MAX_SECTORS_240)
@@ -912,6 +905,12 @@ static const struct scsi_host_template uas_host_template = {
 	.eh_device_reset_handler = uas_eh_device_reset_handler,
 	.this_id = -1,
 	.skip_settle_delay = 1,
+	/*
+	 * The protocol has no requirements on alignment in the strict sense.
+	 * Controllers may or may not have alignment restrictions.
+	 * As this is not exported, we use an extremely conservative guess.
+	 */
+	.dma_alignment = 511,
 	.dma_boundary = PAGE_SIZE - 1,
 	.cmd_size = sizeof(struct uas_cmd_info),
 };
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 6d77c48e8311fb..b0948ab69e0fa6 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -405,6 +405,8 @@ struct scsi_host_template {
 	 */
 	unsigned int max_segment_size;
 
+	unsigned int dma_alignment;
+
 	/*
 	 * DMA scatter gather segment boundary limit. A segment crossing this
 	 * boundary will be split in two.
@@ -614,6 +616,7 @@ struct Scsi_Host {
 	unsigned int max_sectors;
 	unsigned int opt_sectors;
 	unsigned int max_segment_size;
+	unsigned int dma_alignment;
 	unsigned long dma_boundary;
 	unsigned long virt_boundary_mask;
 	/*
-- 
2.39.2

[PATCH 08/23] ufs-exynos: move setting the the dma alignment to the init method

[Christoph Hellwig]

Use the SCSI host's dma_alignment field and set it in ->init and remove
the now unused config_scsi_dev method.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/ufs/core/ufshcd.c     | 3 ---
 drivers/ufs/host/ufs-exynos.c | 8 ++------
 include/ufs/ufshcd.h          | 1 -
 3 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index e30fd125988d7a..7d593395aeff25 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -5262,9 +5262,6 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
 	 */
 	sdev->silence_suspend = 1;
 
-	if (hba->vops && hba->vops->config_scsi_dev)
-		hba->vops->config_scsi_dev(sdev);
-
 	ufshcd_crypto_register(hba, q);
 
 	return 0;
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 734d40f99e31e6..7ffc28e2278420 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -1187,6 +1187,8 @@ static int exynos_ufs_init(struct ufs_hba *hba)
 		goto out;
 	exynos_ufs_specify_phy_time_attr(ufs);
 	exynos_ufs_config_smu(ufs);
+
+	hba->host->dma_alignment = SZ_4K - 1;
 	return 0;
 
 out:
@@ -1510,11 +1512,6 @@ static int fsd_ufs_pre_link(struct exynos_ufs *ufs)
 	return 0;
 }
 
-static void exynos_ufs_config_scsi_dev(struct scsi_device *sdev)
-{
-	blk_queue_update_dma_alignment(sdev->request_queue, SZ_4K - 1);
-}
-
 static int fsd_ufs_post_link(struct exynos_ufs *ufs)
 {
 	int i;
@@ -1583,7 +1580,6 @@ static const struct ufs_hba_variant_ops ufs_hba_exynos_ops = {
 	.hibern8_notify			= exynos_ufs_hibern8_notify,
 	.suspend			= exynos_ufs_suspend,
 	.resume				= exynos_ufs_resume,
-	.config_scsi_dev		= exynos_ufs_config_scsi_dev,
 };
 
 static struct ufs_hba_variant_ops ufs_hba_exynosauto_vh_ops = {
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index cb2afcebbdf514..061919448d3936 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -373,7 +373,6 @@ struct ufs_hba_variant_ops {
 	int	(*get_outstanding_cqs)(struct ufs_hba *hba,
 				       unsigned long *ocqs);
 	int	(*config_esi)(struct ufs_hba *hba);
-	void	(*config_scsi_dev)(struct scsi_device *sdev);
 };
 
 /* clock gating state  */
-- 
2.39.2

[PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

[Christoph Hellwig]

Switch scsi_add_lun to use the atomic queue limits API to update the
max_hw_sectors for devices with quirks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/scsi_scan.c | 49 ++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 205ab3b3ea89be..699356d7d17545 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -874,6 +874,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 		blist_flags_t *bflags, int async)
 {
+	struct queue_limits lim;
 	int ret;
 
 	/*
@@ -1004,19 +1005,6 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 	if (*bflags & BLIST_SELECT_NO_ATN)
 		sdev->select_no_atn = 1;
 
-	/*
-	 * Maximum 512 sector transfer length
-	 * broken RA4x00 Compaq Disk Array
-	 */
-	if (*bflags & BLIST_MAX_512)
-		blk_queue_max_hw_sectors(sdev->request_queue, 512);
-	/*
-	 * Max 1024 sector transfer length for targets that report incorrect
-	 * max/optimal lengths and relied on the old block layer safe default
-	 */
-	else if (*bflags & BLIST_MAX_1024)
-		blk_queue_max_hw_sectors(sdev->request_queue, 1024);
-
 	/*
 	 * Some devices may not want to have a start command automatically
 	 * issued when a device is added.
@@ -1077,19 +1065,22 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 
 	transport_configure_device(&sdev->sdev_gendev);
 
+	/*
+	 * No need to freeze the queue as it isn't reachable to anyone else yet.
+	 */
+	lim = queue_limits_start_update(sdev->request_queue);
+	if (*bflags & BLIST_MAX_512)
+		lim.max_hw_sectors = 512;
+	else if (*bflags & BLIST_MAX_1024)
+		lim.max_hw_sectors = 1024;
+	ret = queue_limits_commit_update(sdev->request_queue, &lim);
+	if (ret)
+		goto fail;
+
 	if (sdev->host->hostt->slave_configure) {
 		ret = sdev->host->hostt->slave_configure(sdev);
-		if (ret) {
-			/*
-			 * if LLDD reports slave not present, don't clutter
-			 * console with alloc failure messages
-			 */
-			if (ret != -ENXIO) {
-				sdev_printk(KERN_ERR, sdev,
-					"failed to configure device\n");
-			}
-			return SCSI_SCAN_NO_RESPONSE;
-		}
+		if (ret)
+			goto fail;
 
 		/*
 		 * The queue_depth is often changed in ->slave_configure.
@@ -1115,8 +1106,16 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 	 */
 	if (!async && scsi_sysfs_add_sdev(sdev) != 0)
 		return SCSI_SCAN_NO_RESPONSE;
-
 	return SCSI_SCAN_LUN_PRESENT;
+
+fail:
+	/*
+	 * If the LLDD reports LU not present, don't clutter the console with
+	 * alloc failure messages.
+	 */
+	if (ret != -ENXIO)
+		sdev_printk(KERN_ERR, sdev, "failed to configure device\n");
+	return SCSI_SCAN_NO_RESPONSE;
 }
 
 #ifdef CONFIG_SCSI_LOGGING
-- 
2.39.2

[PATCH 10/23] scsi: add a device_configure method to the host template

[Christoph Hellwig]

This is a version of ->slave_configure that also takes a queue_limits
structure that the caller applies, and thus allows drivers to reconfigure
the queue using the atomic queue limits API.

In the long run it should also replace ->slave_configure entirely as
there is no need to have two different methods here, and the slave
name in addition to being politically charged also has no basis in
the SCSI standards or the kernel code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/scsi_scan.c | 33 +++++++++++++++++++--------------
 include/scsi/scsi_host.h |  4 ++++
 2 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 699356d7d17545..8e05780f802523 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -227,7 +227,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
 
 	/*
 	 * realloc if new shift is calculated, which is caused by setting
-	 * up one new default queue depth after calling ->slave_configure
+	 * up one new default queue depth after calling ->device_configure
 	 */
 	if (!need_alloc && new_shift != sdev->budget_map.shift)
 		need_alloc = need_free = true;
@@ -874,8 +874,9 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 		blist_flags_t *bflags, int async)
 {
+	const struct scsi_host_template *hostt = sdev->host->hostt;
 	struct queue_limits lim;
-	int ret;
+	int ret, ret2;
 
 	/*
 	 * XXX do not save the inquiry, since it can change underneath us,
@@ -1073,22 +1074,26 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 		lim.max_hw_sectors = 512;
 	else if (*bflags & BLIST_MAX_1024)
 		lim.max_hw_sectors = 1024;
-	ret = queue_limits_commit_update(sdev->request_queue, &lim);
+
+	if (hostt->device_configure)
+		ret = hostt->device_configure(sdev, &lim);
+	else if (hostt->slave_configure)
+		ret = hostt->slave_configure(sdev);
+
+	ret2 = queue_limits_commit_update(sdev->request_queue, &lim);
+	if (ret2 && !ret)
+		ret = ret2;
 	if (ret)
 		goto fail;
 
-	if (sdev->host->hostt->slave_configure) {
-		ret = sdev->host->hostt->slave_configure(sdev);
-		if (ret)
-			goto fail;
-
-		/*
-		 * The queue_depth is often changed in ->slave_configure.
-		 * Set up budget map again since memory consumption of
-		 * the map depends on actual queue depth.
-		 */
+	/*
+	 * The queue_depth is often changed in ->device_configure.
+	 *
+	 * Set up budget map again since memory consumption of the map depends
+	 * on actual queue depth.
+	 */
+	if (hostt->device_configure || hostt->slave_configure)
 		scsi_realloc_sdev_budget_map(sdev, sdev->queue_depth);
-	}
 
 	if (sdev->scsi_level >= SCSI_3)
 		scsi_attach_vpd(sdev);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b0948ab69e0fa6..1959193d47e7f5 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -211,7 +211,11 @@ struct scsi_host_template {
 	 *     up after yourself before returning non-0
 	 *
 	 * Status: OPTIONAL
+	 *
+	 * Note: slave_configure is the legacy version, use device_configure for
+	 * all new code.
 	 */
+	int (* device_configure)(struct scsi_device *, struct queue_limits *lim);
 	int (* slave_configure)(struct scsi_device *);
 
 	/*
-- 
2.39.2

[PATCH 11/23] megaraid_sas: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/megaraid/megaraid_sas.h        |  2 +-
 drivers/scsi/megaraid/megaraid_sas_base.c   | 29 ++++++++++++---------
 drivers/scsi/megaraid/megaraid_sas_fusion.c |  3 ++-
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 56624cbf7fa5e7..5680c6cdb22193 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2701,7 +2701,7 @@ int megasas_get_ctrl_info(struct megasas_instance *instance);
 int
 megasas_sync_pd_seq_num(struct megasas_instance *instance, bool pend);
 void megasas_set_dynamic_target_properties(struct scsi_device *sdev,
-					   bool is_target_prop);
+		struct queue_limits *lim, bool is_target_prop);
 int megasas_get_target_prop(struct megasas_instance *instance,
 			    struct scsi_device *sdev);
 void megasas_get_snapdump_properties(struct megasas_instance *instance);
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 3d4f13da1ae873..def0d905b6d9e3 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1888,7 +1888,7 @@ static struct megasas_instance *megasas_lookup_instance(u16 host_no)
 * Returns void
 */
 void megasas_set_dynamic_target_properties(struct scsi_device *sdev,
-					   bool is_target_prop)
+		struct queue_limits *lim, bool is_target_prop)
 {
 	u16 pd_index = 0, ld;
 	u32 device_id;
@@ -1915,8 +1915,10 @@ void megasas_set_dynamic_target_properties(struct scsi_device *sdev,
 			return;
 		raid = MR_LdRaidGet(ld, local_map_ptr);
 
-		if (raid->capability.ldPiMode == MR_PROT_INFO_TYPE_CONTROLLER)
-			blk_queue_update_dma_alignment(sdev->request_queue, 0x7);
+		if (raid->capability.ldPiMode == MR_PROT_INFO_TYPE_CONTROLLER) {
+			if (lim)
+				lim->dma_alignment = 0x7;
+		}
 
 		mr_device_priv_data->is_tm_capable =
 			raid->capability.tmCapable;
@@ -1967,7 +1969,8 @@ void megasas_set_dynamic_target_properties(struct scsi_device *sdev,
  *
  */
 static inline void
-megasas_set_nvme_device_properties(struct scsi_device *sdev, u32 max_io_size)
+megasas_set_nvme_device_properties(struct scsi_device *sdev,
+		struct queue_limits *lim, u32 max_io_size)
 {
 	struct megasas_instance *instance;
 	u32 mr_nvme_pg_size;
@@ -1976,10 +1979,10 @@ megasas_set_nvme_device_properties(struct scsi_device *sdev, u32 max_io_size)
 	mr_nvme_pg_size = max_t(u32, instance->nvme_page_size,
 				MR_DEFAULT_NVME_PAGE_SIZE);
 
-	blk_queue_max_hw_sectors(sdev->request_queue, (max_io_size / 512));
+	lim->max_hw_sectors = max_io_size / 512;
+	lim->virt_boundary_mask = mr_nvme_pg_size - 1;
 
 	blk_queue_flag_set(QUEUE_FLAG_NOMERGES, sdev->request_queue);
-	blk_queue_virt_boundary(sdev->request_queue, mr_nvme_pg_size - 1);
 }
 
 /*
@@ -2041,7 +2044,7 @@ static void megasas_set_fw_assisted_qd(struct scsi_device *sdev,
  * @is_target_prop			true, if fw provided target properties.
  */
 static void megasas_set_static_target_properties(struct scsi_device *sdev,
-						 bool is_target_prop)
+		struct queue_limits *lim, bool is_target_prop)
 {
 	u32 max_io_size_kb = MR_DEFAULT_NVME_MDTS_KB;
 	struct megasas_instance *instance;
@@ -2060,13 +2063,15 @@ static void megasas_set_static_target_properties(struct scsi_device *sdev,
 		max_io_size_kb = le32_to_cpu(instance->tgt_prop->max_io_size_kb);
 
 	if (instance->nvme_page_size && max_io_size_kb)
-		megasas_set_nvme_device_properties(sdev, (max_io_size_kb << 10));
+		megasas_set_nvme_device_properties(sdev, lim,
+				max_io_size_kb << 10);
 
 	megasas_set_fw_assisted_qd(sdev, is_target_prop);
 }
 
 
-static int megasas_slave_configure(struct scsi_device *sdev)
+static int megasas_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	u16 pd_index = 0;
 	struct megasas_instance *instance;
@@ -2096,10 +2101,10 @@ static int megasas_slave_configure(struct scsi_device *sdev)
 		ret_target_prop = megasas_get_target_prop(instance, sdev);
 
 	is_target_prop = (ret_target_prop == DCMD_SUCCESS) ? true : false;
-	megasas_set_static_target_properties(sdev, is_target_prop);
+	megasas_set_static_target_properties(sdev, lim, is_target_prop);
 
 	/* This sdev property may change post OCR */
-	megasas_set_dynamic_target_properties(sdev, is_target_prop);
+	megasas_set_dynamic_target_properties(sdev, lim, is_target_prop);
 
 	mutex_unlock(&instance->reset_mutex);
 
@@ -3507,7 +3512,7 @@ static const struct scsi_host_template megasas_template = {
 	.module = THIS_MODULE,
 	.name = "Avago SAS based MegaRAID driver",
 	.proc_name = "megaraid_sas",
-	.slave_configure = megasas_slave_configure,
+	.device_configure = megasas_device_configure,
 	.slave_alloc = megasas_slave_alloc,
 	.slave_destroy = megasas_slave_destroy,
 	.queuecommand = megasas_queue_command,
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index c60014e07b449e..6c1fb8149553a8 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -5119,7 +5119,8 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason)
 					ret_target_prop = megasas_get_target_prop(instance, sdev);
 
 				is_target_prop = (ret_target_prop == DCMD_SUCCESS) ? true : false;
-				megasas_set_dynamic_target_properties(sdev, is_target_prop);
+				megasas_set_dynamic_target_properties(sdev, NULL,
+						is_target_prop);
 			}
 
 			status_reg = instance->instancet->read_fw_status_reg
-- 
2.39.2

[PATCH 12/23] mpt3sas: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index ef8ee93005eae6..89ef43a5ef862d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -2497,14 +2497,15 @@ _scsih_enable_tlr(struct MPT3SAS_ADAPTER *ioc, struct scsi_device *sdev)
 }
 
 /**
- * scsih_slave_configure - device configure routine.
+ * scsih_device_configure - device configure routine.
  * @sdev: scsi device struct
+ * @lim: queue limits
  *
  * Return: 0 if ok. Any other return is assumed to be an error and
  * the device is ignored.
  */
 static int
-scsih_slave_configure(struct scsi_device *sdev)
+scsih_device_configure(struct scsi_device *sdev, struct queue_limits *lim)
 {
 	struct Scsi_Host *shost = sdev->host;
 	struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
@@ -2609,8 +2610,7 @@ scsih_slave_configure(struct scsi_device *sdev)
 			    raid_device->num_pds, ds);
 
 		if (shost->max_sectors > MPT3SAS_RAID_MAX_SECTORS) {
-			blk_queue_max_hw_sectors(sdev->request_queue,
-						MPT3SAS_RAID_MAX_SECTORS);
+			lim->max_hw_sectors = MPT3SAS_RAID_MAX_SECTORS;
 			sdev_printk(KERN_INFO, sdev,
 					"Set queue's max_sector to: %u\n",
 						MPT3SAS_RAID_MAX_SECTORS);
@@ -2675,8 +2675,7 @@ scsih_slave_configure(struct scsi_device *sdev)
 				pcie_device->connector_name);
 
 		if (pcie_device->nvme_mdts)
-			blk_queue_max_hw_sectors(sdev->request_queue,
-					pcie_device->nvme_mdts/512);
+			lim->max_hw_sectors = pcie_device->nvme_mdts / 512;
 
 		pcie_device_put(pcie_device);
 		spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
@@ -2687,8 +2686,7 @@ scsih_slave_configure(struct scsi_device *sdev)
 		 **/
 		blk_queue_flag_set(QUEUE_FLAG_NOMERGES,
 				sdev->request_queue);
-		blk_queue_virt_boundary(sdev->request_queue,
-				ioc->page_size - 1);
+		lim->virt_boundary_mask = ioc->page_size - 1;
 		return 0;
 	}
 
@@ -11914,7 +11912,7 @@ static const struct scsi_host_template mpt2sas_driver_template = {
 	.queuecommand			= scsih_qcmd,
 	.target_alloc			= scsih_target_alloc,
 	.slave_alloc			= scsih_slave_alloc,
-	.slave_configure		= scsih_slave_configure,
+	.device_configure		= scsih_device_configure,
 	.target_destroy			= scsih_target_destroy,
 	.slave_destroy			= scsih_slave_destroy,
 	.scan_finished			= scsih_scan_finished,
@@ -11952,7 +11950,7 @@ static const struct scsi_host_template mpt3sas_driver_template = {
 	.queuecommand			= scsih_qcmd,
 	.target_alloc			= scsih_target_alloc,
 	.slave_alloc			= scsih_slave_alloc,
-	.slave_configure		= scsih_slave_configure,
+	.device_configure		= scsih_device_configure,
 	.target_destroy			= scsih_target_destroy,
 	.slave_destroy			= scsih_slave_destroy,
 	.scan_finished			= scsih_scan_finished,
-- 
2.39.2

[PATCH 13/23] sbp2: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/firewire/sbp2.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 8f7810b2a4c10f..827dee0f57dde2 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1506,7 +1506,8 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 	return 0;
 }
 
-static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
+static int sbp2_scsi_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct sbp2_logical_unit *lu = sdev->hostdata;
 
@@ -1532,7 +1533,7 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
 		sdev->start_stop_pwr_cond = 1;
 
 	if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
-		blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512);
+		lim->max_hw_sectors = 128 * 1024 / 512;
 
 	return 0;
 }
@@ -1590,7 +1591,7 @@ static const struct scsi_host_template scsi_driver_template = {
 	.proc_name		= "sbp2",
 	.queuecommand		= sbp2_scsi_queuecommand,
 	.slave_alloc		= sbp2_scsi_slave_alloc,
-	.slave_configure	= sbp2_scsi_slave_configure,
+	.device_configure	= sbp2_scsi_device_configure,
 	.eh_abort_handler	= sbp2_scsi_abort,
 	.this_id		= -1,
 	.sg_tablesize		= SG_ALL,
-- 
2.39.2

[PATCH 14/23] hptiop: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/hptiop.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c
index f5334ccbf2cac3..e889f268601b4f 100644
--- a/drivers/scsi/hptiop.c
+++ b/drivers/scsi/hptiop.c
@@ -1151,11 +1151,11 @@ static struct attribute *hptiop_host_attrs[] = {
 
 ATTRIBUTE_GROUPS(hptiop_host);
 
-static int hptiop_slave_config(struct scsi_device *sdev)
+static int hptiop_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	if (sdev->type == TYPE_TAPE)
-		blk_queue_max_hw_sectors(sdev->request_queue, 8192);
-
+		lim->max_hw_sectors = 8192;
 	return 0;
 }
 
@@ -1168,7 +1168,7 @@ static const struct scsi_host_template driver_template = {
 	.emulated                   = 0,
 	.proc_name                  = driver_name,
 	.shost_groups		    = hptiop_host_groups,
-	.slave_configure            = hptiop_slave_config,
+	.device_configure	    = hptiop_device_configure,
 	.this_id                    = -1,
 	.change_queue_depth         = hptiop_adjust_disk_queue_depth,
 	.cmd_size		    = sizeof(struct hpt_cmd_priv),
-- 
2.39.2

[PATCH 15/23] ipr: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/ipr.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 3819f7c42788bc..388c8a10295a67 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -4769,15 +4769,17 @@ static void ipr_slave_destroy(struct scsi_device *sdev)
 }
 
 /**
- * ipr_slave_configure - Configure a SCSI device
+ * ipr_device_configure - Configure a SCSI device
  * @sdev:	scsi device struct
+ * @lim:	queue limits
  *
  * This function configures the specified scsi device.
  *
  * Return value:
  * 	0 on success
  **/
-static int ipr_slave_configure(struct scsi_device *sdev)
+static int ipr_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *) sdev->host->hostdata;
 	struct ipr_resource_entry *res;
@@ -4798,7 +4800,7 @@ static int ipr_slave_configure(struct scsi_device *sdev)
 			sdev->no_report_opcodes = 1;
 			blk_queue_rq_timeout(sdev->request_queue,
 					     IPR_VSET_RW_TIMEOUT);
-			blk_queue_max_hw_sectors(sdev->request_queue, IPR_VSET_MAX_SECTORS);
+			lim->max_hw_sectors = IPR_VSET_MAX_SECTORS;
 		}
 		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
 
@@ -6397,7 +6399,7 @@ static const struct scsi_host_template driver_template = {
 	.eh_device_reset_handler = ipr_eh_dev_reset,
 	.eh_host_reset_handler = ipr_eh_host_reset,
 	.slave_alloc = ipr_slave_alloc,
-	.slave_configure = ipr_slave_configure,
+	.device_configure = ipr_device_configure,
 	.slave_destroy = ipr_slave_destroy,
 	.scan_finished = ipr_scan_finished,
 	.target_destroy = ipr_target_destroy,
-- 
2.39.2

[PATCH 16/23] pmcraid: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/pmcraid.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index e8bcc3a88732a1..0184fcbc15a9e2 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -195,8 +195,9 @@ static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
 }
 
 /**
- * pmcraid_slave_configure - Configures a SCSI device
+ * pmcraid_device_configure - Configures a SCSI device
  * @scsi_dev: scsi device struct
+ * @lim: queue limits
  *
  * This function is executed by SCSI mid layer just after a device is first
  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
@@ -207,7 +208,8 @@ static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
  * Return value:
  *	  0 on success
  */
-static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
+static int pmcraid_device_configure(struct scsi_device *scsi_dev,
+		struct queue_limits *lim)
 {
 	struct pmcraid_resource_entry *res = scsi_dev->hostdata;
 
@@ -231,8 +233,7 @@ static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
 		scsi_dev->allow_restart = 1;
 		blk_queue_rq_timeout(scsi_dev->request_queue,
 				     PMCRAID_VSET_IO_TIMEOUT);
-		blk_queue_max_hw_sectors(scsi_dev->request_queue,
-				      PMCRAID_VSET_MAX_SECTORS);
+		lim->max_hw_sectors = PMCRAID_VSET_MAX_SECTORS;
 	}
 
 	/*
@@ -3666,7 +3667,7 @@ static const struct scsi_host_template pmcraid_host_template = {
 	.eh_host_reset_handler = pmcraid_eh_host_reset_handler,
 
 	.slave_alloc = pmcraid_slave_alloc,
-	.slave_configure = pmcraid_slave_configure,
+	.device_configure = pmcraid_device_configure,
 	.slave_destroy = pmcraid_slave_destroy,
 	.change_queue_depth = pmcraid_change_queue_depth,
 	.can_queue = PMCRAID_MAX_IO_CMD,
-- 
2.39.2

[PATCH 17/23] usb-storage: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Also use the proper atomic queue limit update helpers and freeze the
queue when updating max_hw_sectors from sysfs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/usb/storage/scsiglue.c | 36 ++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index eb4ba03e082d89..b31464740f6c86 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -82,7 +82,7 @@ static int slave_alloc (struct scsi_device *sdev)
 	return 0;
 }
 
-static int slave_configure(struct scsi_device *sdev)
+static int device_configure(struct scsi_device *sdev, struct queue_limits *lim)
 {
 	struct us_data *us = host_to_us(sdev->host);
 	struct device *dev = us->pusb_dev->bus->sysdev;
@@ -97,31 +97,28 @@ static int slave_configure(struct scsi_device *sdev)
 
 		if (us->fflags & US_FL_MAX_SECTORS_MIN)
 			max_sectors = PAGE_SIZE >> 9;
-		if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
-			blk_queue_max_hw_sectors(sdev->request_queue,
-					      max_sectors);
+		lim->max_hw_sectors = min(lim->max_hw_sectors, max_sectors);
 	} else if (sdev->type == TYPE_TAPE) {
 		/*
 		 * Tapes need much higher max_sector limits, so just
 		 * raise it to the maximum possible (4 GB / 512) and
 		 * let the queue segment size sort out the real limit.
 		 */
-		blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
+		lim->max_hw_sectors = 0x7FFFFF;
 	} else if (us->pusb_dev->speed >= USB_SPEED_SUPER) {
 		/*
 		 * USB3 devices will be limited to 2048 sectors. This gives us
 		 * better throughput on most devices.
 		 */
-		blk_queue_max_hw_sectors(sdev->request_queue, 2048);
+		lim->max_hw_sectors = 2048;
 	}
 
 	/*
 	 * The max_hw_sectors should be up to maximum size of a mapping for
 	 * the device. Otherwise, a DMA API might fail on swiotlb environment.
 	 */
-	blk_queue_max_hw_sectors(sdev->request_queue,
-		min_t(size_t, queue_max_hw_sectors(sdev->request_queue),
-		      dma_max_mapping_size(dev) >> SECTOR_SHIFT));
+	lim->max_hw_sectors = min_t(size_t,
+		lim->max_hw_sectors, dma_max_mapping_size(dev) >> SECTOR_SHIFT);
 
 	/*
 	 * We can't put these settings in slave_alloc() because that gets
@@ -582,13 +579,22 @@ static ssize_t max_sectors_store(struct device *dev, struct device_attribute *at
 		size_t count)
 {
 	struct scsi_device *sdev = to_scsi_device(dev);
+	struct queue_limits lim;
 	unsigned short ms;
+	int ret;
 
-	if (sscanf(buf, "%hu", &ms) > 0) {
-		blk_queue_max_hw_sectors(sdev->request_queue, ms);
-		return count;
-	}
-	return -EINVAL;
+	if (sscanf(buf, "%hu", &ms) <= 0)
+		return -EINVAL;
+
+	blk_mq_freeze_queue(sdev->request_queue);
+	lim = queue_limits_start_update(sdev->request_queue);
+	lim.max_hw_sectors = ms;
+	ret = queue_limits_commit_update(sdev->request_queue, &lim);
+	blk_mq_unfreeze_queue(sdev->request_queue);
+
+	if (ret)
+		return ret;
+	return count;
 }
 static DEVICE_ATTR_RW(max_sectors);
 
@@ -626,7 +632,7 @@ static const struct scsi_host_template usb_stor_host_template = {
 	.this_id =			-1,
 
 	.slave_alloc =			slave_alloc,
-	.slave_configure =		slave_configure,
+	.device_configure =		device_configure,
 	.target_alloc =			target_alloc,
 
 	/* lots of sg segments can be handled */
-- 
2.39.2

[PATCH 18/23] sata_nv: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/ata/sata_nv.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 0a0cee755bde73..d0a8eb0e8011d0 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -296,7 +296,8 @@ static void nv_nf2_freeze(struct ata_port *ap);
 static void nv_nf2_thaw(struct ata_port *ap);
 static void nv_ck804_freeze(struct ata_port *ap);
 static void nv_ck804_thaw(struct ata_port *ap);
-static int nv_adma_slave_config(struct scsi_device *sdev);
+static int nv_adma_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim);
 static int nv_adma_check_atapi_dma(struct ata_queued_cmd *qc);
 static enum ata_completion_errors nv_adma_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc);
@@ -318,7 +319,8 @@ static void nv_adma_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static void nv_mcp55_thaw(struct ata_port *ap);
 static void nv_mcp55_freeze(struct ata_port *ap);
 static void nv_swncq_error_handler(struct ata_port *ap);
-static int nv_swncq_slave_config(struct scsi_device *sdev);
+static int nv_swncq_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim);
 static int nv_swncq_port_start(struct ata_port *ap);
 static enum ata_completion_errors nv_swncq_qc_prep(struct ata_queued_cmd *qc);
 static void nv_swncq_fill_sg(struct ata_queued_cmd *qc);
@@ -380,7 +382,7 @@ static const struct scsi_host_template nv_adma_sht = {
 	.can_queue		= NV_ADMA_MAX_CPBS,
 	.sg_tablesize		= NV_ADMA_SGTBL_TOTAL_LEN,
 	.dma_boundary		= NV_ADMA_DMA_BOUNDARY,
-	.slave_configure	= nv_adma_slave_config,
+	.device_configure	= nv_adma_device_configure,
 	.sdev_groups		= ata_ncq_sdev_groups,
 	.change_queue_depth     = ata_scsi_change_queue_depth,
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,
@@ -391,7 +393,7 @@ static const struct scsi_host_template nv_swncq_sht = {
 	.can_queue		= ATA_MAX_QUEUE - 1,
 	.sg_tablesize		= LIBATA_MAX_PRD,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
-	.slave_configure	= nv_swncq_slave_config,
+	.device_configure	= nv_swncq_device_configure,
 	.sdev_groups		= ata_ncq_sdev_groups,
 	.change_queue_depth     = ata_scsi_change_queue_depth,
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,
@@ -661,7 +663,8 @@ static void nv_adma_mode(struct ata_port *ap)
 	pp->flags &= ~NV_ADMA_PORT_REGISTER_MODE;
 }
 
-static int nv_adma_slave_config(struct scsi_device *sdev)
+static int nv_adma_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct ata_port *ap = ata_shost_to_port(sdev->host);
 	struct nv_adma_port_priv *pp = ap->private_data;
@@ -740,8 +743,8 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
 		rc = dma_set_mask(&pdev->dev, pp->adma_dma_mask);
 	}
 
-	blk_queue_segment_boundary(sdev->request_queue, segment_boundary);
-	blk_queue_max_segments(sdev->request_queue, sg_tablesize);
+	lim->seg_boundary_mask = segment_boundary;
+	lim->max_segments = sg_tablesize;
 	ata_port_info(ap,
 		      "DMA mask 0x%llX, segment boundary 0x%lX, hw segs %hu\n",
 		      (unsigned long long)*ap->host->dev->dma_mask,
@@ -1868,7 +1871,8 @@ static void nv_swncq_host_init(struct ata_host *host)
 	writel(~0x0, mmio + NV_INT_STATUS_MCP55);
 }
 
-static int nv_swncq_slave_config(struct scsi_device *sdev)
+static int nv_swncq_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct ata_port *ap = ata_shost_to_port(sdev->host);
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-- 
2.39.2

[PATCH 19/23] pata_macio: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/ata/pata_macio.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 4ac854f6b05777..f046bfa5c6e7f6 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -796,7 +796,8 @@ static void pata_macio_reset_hw(struct pata_macio_priv *priv, int resume)
 /* Hook the standard slave config to fixup some HW related alignment
  * restrictions
  */
-static int pata_macio_slave_config(struct scsi_device *sdev)
+static int pata_macio_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct ata_port *ap = ata_shost_to_port(sdev->host);
 	struct pata_macio_priv *priv = ap->private_data;
@@ -814,7 +815,7 @@ static int pata_macio_slave_config(struct scsi_device *sdev)
 
 	/* OHare has issues with non cache aligned DMA on some chipsets */
 	if (priv->kind == controller_ohare) {
-		blk_queue_update_dma_alignment(sdev->request_queue, 31);
+		lim->dma_alignment = 31;
 		blk_queue_update_dma_pad(sdev->request_queue, 31);
 
 		/* Tell the world about it */
@@ -829,7 +830,7 @@ static int pata_macio_slave_config(struct scsi_device *sdev)
 	/* Shasta and K2 seem to have "issues" with reads ... */
 	if (priv->kind == controller_sh_ata6 || priv->kind == controller_k2_ata6) {
 		/* Allright these are bad, apply restrictions */
-		blk_queue_update_dma_alignment(sdev->request_queue, 15);
+		lim->dma_alignment = 15;
 		blk_queue_update_dma_pad(sdev->request_queue, 15);
 
 		/* We enable MWI and hack cache line size directly here, this
@@ -918,7 +919,7 @@ static const struct scsi_host_template pata_macio_sht = {
 	 * use 64K minus 256
 	 */
 	.max_segment_size	= MAX_DBDMA_SEG,
-	.slave_configure	= pata_macio_slave_config,
+	.device_configure	= pata_macio_device_configure,
 	.sdev_groups		= ata_common_sdev_groups,
 	.can_queue		= ATA_DEF_QUEUE,
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,
-- 
2.39.2

[PATCH 20/23] libata: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/ata/ahci.h                     |  2 +-
 drivers/ata/libata-sata.c              | 10 ++++++----
 drivers/ata/libata-scsi.c              | 19 +++++++++++--------
 drivers/ata/libata.h                   |  3 ++-
 drivers/ata/pata_macio.c               |  2 +-
 drivers/ata/sata_mv.c                  |  2 +-
 drivers/ata/sata_nv.c                  |  4 ++--
 drivers/ata/sata_sil24.c               |  2 +-
 drivers/scsi/aic94xx/aic94xx_init.c    |  2 +-
 drivers/scsi/hisi_sas/hisi_sas.h       |  3 ++-
 drivers/scsi/hisi_sas/hisi_sas_main.c  |  7 ++++---
 drivers/scsi/hisi_sas/hisi_sas_v1_hw.c |  2 +-
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c |  2 +-
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c |  7 ++++---
 drivers/scsi/isci/init.c               |  2 +-
 drivers/scsi/libsas/sas_scsi_host.c    |  7 ++++---
 drivers/scsi/mvsas/mv_init.c           |  2 +-
 drivers/scsi/pm8001/pm8001_init.c      |  2 +-
 include/linux/libata.h                 | 10 ++++++----
 include/scsi/libsas.h                  |  3 ++-
 20 files changed, 53 insertions(+), 40 deletions(-)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 344c87210d8fe4..8f40f75ba08cff 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -397,7 +397,7 @@ extern const struct attribute_group *ahci_sdev_groups[];
 	.sdev_groups		= ahci_sdev_groups,			\
 	.change_queue_depth     = ata_scsi_change_queue_depth,		\
 	.tag_alloc_policy       = BLK_TAG_ALLOC_RR,             	\
-	.slave_configure        = ata_scsi_slave_config
+	.device_configure	= ata_scsi_device_configure
 
 extern struct ata_port_operations ahci_ops;
 extern struct ata_port_operations ahci_platform_ops;
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 0fb1934875f208..98780d3b2f1c1a 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -1170,21 +1170,23 @@ void ata_sas_tport_delete(struct ata_port *ap)
 EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
 
 /**
- *	ata_sas_slave_configure - Default slave_config routine for libata devices
+ *	ata_sas_device_configure - Default slave_config routine for libata devices
  *	@sdev: SCSI device to configure
+ *	@lim: queue limits
  *	@ap: ATA port to which SCSI device is attached
  *
  *	RETURNS:
  *	Zero.
  */
 
-int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+int ata_sas_device_configure(struct scsi_device *sdev, struct queue_limits *lim,
+		struct ata_port *ap)
 {
 	ata_scsi_sdev_config(sdev);
 
-	return ata_scsi_dev_config(sdev, ap->link.device);
+	return ata_scsi_dev_config(sdev, lim, ap->link.device);
 }
-EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+EXPORT_SYMBOL_GPL(ata_sas_device_configure);
 
 /**
  *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0a0f483124c3a5..db441815d63306 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1021,7 +1021,8 @@ bool ata_scsi_dma_need_drain(struct request *rq)
 }
 EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain);
 
-int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
+int ata_scsi_dev_config(struct scsi_device *sdev, struct queue_limits *lim,
+		struct ata_device *dev)
 {
 	struct request_queue *q = sdev->request_queue;
 	int depth = 1;
@@ -1031,7 +1032,7 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 
 	/* configure max sectors */
 	dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors);
-	blk_queue_max_hw_sectors(q, dev->max_sectors);
+	lim->max_hw_sectors = dev->max_sectors;
 
 	if (dev->class == ATA_DEV_ATAPI) {
 		sdev->sector_size = ATA_SECT_SIZE;
@@ -1040,7 +1041,7 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 		blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
 
 		/* make room for appending the drain */
-		blk_queue_max_segments(q, queue_max_segments(q) - 1);
+		lim->max_segments--;
 
 		sdev->dma_drain_len = ATAPI_MAX_DRAIN;
 		sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO);
@@ -1077,7 +1078,7 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 			"sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
 			sdev->sector_size);
 
-	blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
+	lim->dma_alignment = sdev->sector_size - 1;
 
 	if (dev->flags & ATA_DFLAG_AN)
 		set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
@@ -1131,8 +1132,9 @@ int ata_scsi_slave_alloc(struct scsi_device *sdev)
 EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc);
 
 /**
- *	ata_scsi_slave_config - Set SCSI device attributes
+ *	ata_scsi_device_configure - Set SCSI device attributes
  *	@sdev: SCSI device to examine
+ *	@lim: queue limits
  *
  *	This is called before we actually start reading
  *	and writing to the device, to configure certain
@@ -1142,17 +1144,18 @@ EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc);
  *	Defined by SCSI layer.  We don't really care.
  */
 
-int ata_scsi_slave_config(struct scsi_device *sdev)
+int ata_scsi_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct ata_port *ap = ata_shost_to_port(sdev->host);
 	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
 
 	if (dev)
-		return ata_scsi_dev_config(sdev, dev);
+		return ata_scsi_dev_config(sdev, lim, dev);
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
+EXPORT_SYMBOL_GPL(ata_scsi_device_configure);
 
 /**
  *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 5c685bb1939e68..8aab0df549eacd 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -131,7 +131,8 @@ extern void ata_scsi_dev_rescan(struct work_struct *work);
 extern int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
 			      unsigned int id, u64 lun);
 void ata_scsi_sdev_config(struct scsi_device *sdev);
-int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev);
+int ata_scsi_dev_config(struct scsi_device *sdev, struct queue_limits *lim,
+		struct ata_device *dev);
 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev);
 
 /* libata-eh.c */
diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index f046bfa5c6e7f6..3dbcd737ebb792 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -806,7 +806,7 @@ static int pata_macio_device_configure(struct scsi_device *sdev,
 	int rc;
 
 	/* First call original */
-	rc = ata_scsi_slave_config(sdev);
+	rc = ata_scsi_device_configure(sdev, lim);
 	if (rc)
 		return rc;
 
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index e82786c63fbd73..0bb900869ee08c 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -673,7 +673,7 @@ static const struct scsi_host_template mv6_sht = {
 	.sdev_groups		= ata_ncq_sdev_groups,
 	.change_queue_depth	= ata_scsi_change_queue_depth,
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,
-	.slave_configure	= ata_scsi_slave_config
+	.device_configure	= ata_scsi_device_configure
 };
 
 static struct ata_port_operations mv5_ops = {
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index d0a8eb0e8011d0..36d99043ef50ff 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -676,7 +676,7 @@ static int nv_adma_device_configure(struct scsi_device *sdev,
 	int adma_enable;
 	u32 current_reg, new_reg, config_mask;
 
-	rc = ata_scsi_slave_config(sdev);
+	rc = ata_scsi_device_configure(sdev, lim);
 
 	if (sdev->id >= ATA_MAX_DEVICES || sdev->channel || sdev->lun)
 		/* Not a proper libata device, ignore */
@@ -1882,7 +1882,7 @@ static int nv_swncq_device_configure(struct scsi_device *sdev,
 	u8 check_maxtor = 0;
 	unsigned char model_num[ATA_ID_PROD_LEN + 1];
 
-	rc = ata_scsi_slave_config(sdev);
+	rc = ata_scsi_device_configure(sdev, lim);
 	if (sdev->id >= ATA_MAX_DEVICES || sdev->channel || sdev->lun)
 		/* Not a proper libata device, ignore */
 		return rc;
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 142e70bfc4982c..72c03cbdaff43b 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -381,7 +381,7 @@ static const struct scsi_host_template sil24_sht = {
 	.tag_alloc_policy	= BLK_TAG_ALLOC_FIFO,
 	.sdev_groups		= ata_ncq_sdev_groups,
 	.change_queue_depth	= ata_scsi_change_queue_depth,
-	.slave_configure	= ata_scsi_slave_config
+	.device_configure	= ata_scsi_device_configure
 };
 
 static struct ata_port_operations sil24_ops = {
diff --git a/drivers/scsi/aic94xx/aic94xx_init.c b/drivers/scsi/aic94xx/aic94xx_init.c
index 8a3340d8d7ad41..575c60f5391d59 100644
--- a/drivers/scsi/aic94xx/aic94xx_init.c
+++ b/drivers/scsi/aic94xx/aic94xx_init.c
@@ -42,7 +42,7 @@ static const struct scsi_host_template aic94xx_sht = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= sas_slave_configure,
+	.device_configure	= sas_device_configure,
 	.scan_finished		= asd_scan_finished,
 	.scan_start		= asd_scan_start,
 	.change_queue_depth	= sas_change_queue_depth,
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 1e4550156b735d..d223f482488fc6 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -643,7 +643,8 @@ extern int hisi_sas_probe(struct platform_device *pdev,
 			  const struct hisi_sas_hw *ops);
 extern void hisi_sas_remove(struct platform_device *pdev);
 
-extern int hisi_sas_slave_configure(struct scsi_device *sdev);
+int hisi_sas_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim);
 extern int hisi_sas_slave_alloc(struct scsi_device *sdev);
 extern int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time);
 extern void hisi_sas_scan_start(struct Scsi_Host *shost);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 097dfe4b620dce..11228ba51ded74 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -868,10 +868,11 @@ static int hisi_sas_dev_found(struct domain_device *device)
 	return rc;
 }
 
-int hisi_sas_slave_configure(struct scsi_device *sdev)
+int hisi_sas_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct domain_device *dev = sdev_to_domain_dev(sdev);
-	int ret = sas_slave_configure(sdev);
+	int ret = sas_device_configure(sdev, lim);
 
 	if (ret)
 		return ret;
@@ -880,7 +881,7 @@ int hisi_sas_slave_configure(struct scsi_device *sdev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(hisi_sas_slave_configure);
+EXPORT_SYMBOL_GPL(hisi_sas_device_configure);
 
 void hisi_sas_scan_start(struct Scsi_Host *shost)
 {
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index 3c555579f9a1cf..5eb03bffcdedf2 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -1741,7 +1741,7 @@ static const struct scsi_host_template sht_v1_hw = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= hisi_sas_slave_configure,
+	.device_configure	= hisi_sas_device_configure,
 	.scan_finished		= hisi_sas_scan_finished,
 	.scan_start		= hisi_sas_scan_start,
 	.change_queue_depth	= sas_change_queue_depth,
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 73b378837da7bd..b4d91577a050a0 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -3568,7 +3568,7 @@ static const struct scsi_host_template sht_v2_hw = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= hisi_sas_slave_configure,
+	.device_configure	= hisi_sas_device_configure,
 	.scan_finished		= hisi_sas_scan_finished,
 	.scan_start		= hisi_sas_scan_start,
 	.change_queue_depth	= sas_change_queue_depth,
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 7d2a33514538c2..d5950686939cba 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -2894,11 +2894,12 @@ static ssize_t iopoll_q_cnt_v3_hw_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(iopoll_q_cnt_v3_hw);
 
-static int slave_configure_v3_hw(struct scsi_device *sdev)
+static int device_configure_v3_hw(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct Scsi_Host *shost = dev_to_shost(&sdev->sdev_gendev);
 	struct hisi_hba *hisi_hba = shost_priv(shost);
-	int ret = hisi_sas_slave_configure(sdev);
+	int ret = hisi_sas_device_configure(sdev, lim);
 	struct device *dev = hisi_hba->dev;
 
 	if (ret)
@@ -3321,7 +3322,7 @@ static const struct scsi_host_template sht_v3_hw = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= slave_configure_v3_hw,
+	.device_configure	= device_configure_v3_hw,
 	.scan_finished		= hisi_sas_scan_finished,
 	.scan_start		= hisi_sas_scan_start,
 	.map_queues		= hisi_sas_map_queues,
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index c582a3932ceab7..109deff007e612 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -157,7 +157,7 @@ static const struct scsi_host_template isci_sht = {
 	.queuecommand			= sas_queuecommand,
 	.dma_need_drain			= ata_scsi_dma_need_drain,
 	.target_alloc			= sas_target_alloc,
-	.slave_configure		= sas_slave_configure,
+	.device_configure		= sas_device_configure,
 	.scan_finished			= isci_host_scan_finished,
 	.scan_start			= isci_host_start,
 	.change_queue_depth		= sas_change_queue_depth,
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 9047cfcd1072ec..da11d32840e272 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -804,14 +804,15 @@ EXPORT_SYMBOL_GPL(sas_target_alloc);
 
 #define SAS_DEF_QD 256
 
-int sas_slave_configure(struct scsi_device *scsi_dev)
+int sas_device_configure(struct scsi_device *scsi_dev,
+		struct queue_limits *lim)
 {
 	struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 
 	BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 
 	if (dev_is_sata(dev)) {
-		ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
+		ata_sas_device_configure(scsi_dev, lim, dev->sata_dev.ap);
 		return 0;
 	}
 
@@ -829,7 +830,7 @@ int sas_slave_configure(struct scsi_device *scsi_dev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(sas_slave_configure);
+EXPORT_SYMBOL_GPL(sas_device_configure);
 
 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 {
diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 43ebb331e21673..2ed3e19f19e343 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -35,7 +35,7 @@ static const struct scsi_host_template mvs_sht = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= sas_slave_configure,
+	.device_configure	= sas_device_configure,
 	.scan_finished		= mvs_scan_finished,
 	.scan_start		= mvs_scan_start,
 	.change_queue_depth	= sas_change_queue_depth,
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index ed6b7d954dda87..5c17d5dd62eaf5 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -116,7 +116,7 @@ static const struct scsi_host_template pm8001_sht = {
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
-	.slave_configure	= sas_slave_configure,
+	.device_configure	= sas_device_configure,
 	.scan_finished		= pm8001_scan_finished,
 	.scan_start		= pm8001_scan_start,
 	.change_queue_depth	= sas_change_queue_depth,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 26d68115afb826..3d1f30f2dd82b8 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1151,7 +1151,8 @@ extern int ata_std_bios_param(struct scsi_device *sdev,
 			      sector_t capacity, int geom[]);
 extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
 extern int ata_scsi_slave_alloc(struct scsi_device *sdev);
-extern int ata_scsi_slave_config(struct scsi_device *sdev);
+int ata_scsi_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim);
 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
 				       int queue_depth);
@@ -1243,7 +1244,8 @@ extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
 extern void ata_port_probe(struct ata_port *ap);
 extern int ata_sas_tport_add(struct device *parent, struct ata_port *ap);
 extern void ata_sas_tport_delete(struct ata_port *ap);
-extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
+int ata_sas_device_configure(struct scsi_device *sdev, struct queue_limits *lim,
+		struct ata_port *ap);
 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
 extern void ata_tf_to_fis(const struct ata_taskfile *tf,
 			  u8 pmp, int is_cmd, u8 *fis);
@@ -1409,13 +1411,13 @@ extern const struct attribute_group *ata_common_sdev_groups[];
 	__ATA_BASE_SHT(drv_name),				\
 	.can_queue		= ATA_DEF_QUEUE,		\
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,		\
-	.slave_configure	= ata_scsi_slave_config
+	.device_configure	= ata_scsi_device_configure
 
 #define ATA_SUBBASE_SHT_QD(drv_name, drv_qd)			\
 	__ATA_BASE_SHT(drv_name),				\
 	.can_queue		= drv_qd,			\
 	.tag_alloc_policy	= BLK_TAG_ALLOC_RR,		\
-	.slave_configure	= ata_scsi_slave_config
+	.device_configure	= ata_scsi_device_configure
 
 #define ATA_BASE_SHT(drv_name)					\
 	ATA_SUBBASE_SHT(drv_name),				\
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index f5257103fdb6d8..82ba313b06d753 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -683,7 +683,8 @@ int sas_phy_reset(struct sas_phy *phy, int hard_reset);
 int sas_phy_enable(struct sas_phy *phy, int enable);
 extern int sas_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
 extern int sas_target_alloc(struct scsi_target *);
-extern int sas_slave_configure(struct scsi_device *);
+int sas_device_configure(struct scsi_device *dev,
+		struct queue_limits *lim);
 extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
 extern int sas_bios_param(struct scsi_device *, struct block_device *,
 			  sector_t capacity, int *hsc);
-- 
2.39.2

[PATCH 21/23] mpi3mr: switch to using ->device_configure

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_configure
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Note that mpi3mr also updates the limits from an event handler that
iterates all SCSI devices.  This is also updated to use the
queue_limits, but the complete locking of this path probably means
it already is completely broken and needs a proper audit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/mpi3mr/mpi3mr.h    |  1 -
 drivers/scsi/mpi3mr/mpi3mr_os.c | 76 ++++++++++++++-------------------
 2 files changed, 31 insertions(+), 46 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 3de1ee05c44e4c..565d6047f68cb8 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -1348,7 +1348,6 @@ void mpi3mr_wait_for_host_io(struct mpi3mr_ioc *mrioc, u32 timeout);
 void mpi3mr_cleanup_fwevt_list(struct mpi3mr_ioc *mrioc);
 void mpi3mr_flush_host_io(struct mpi3mr_ioc *mrioc);
 void mpi3mr_invalidate_devhandles(struct mpi3mr_ioc *mrioc);
-void mpi3mr_rfresh_tgtdevs(struct mpi3mr_ioc *mrioc);
 void mpi3mr_flush_delayed_cmd_lists(struct mpi3mr_ioc *mrioc);
 void mpi3mr_check_rh_fault_ioc(struct mpi3mr_ioc *mrioc, u32 reason_code);
 void mpi3mr_print_fault_info(struct mpi3mr_ioc *mrioc);
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 73c831a97d276a..de3e02446c6814 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -986,6 +986,25 @@ static int mpi3mr_change_queue_depth(struct scsi_device *sdev,
 	return retval;
 }
 
+static void mpi3mr_configure_nvme_dev(struct mpi3mr_tgt_dev *tgt_dev,
+		struct queue_limits *lim)
+{
+	u8 pgsz = tgt_dev->dev_spec.pcie_inf.pgsz ? : MPI3MR_DEFAULT_PGSZEXP;
+
+	lim->max_hw_sectors = tgt_dev->dev_spec.pcie_inf.mdts / 512;
+	lim->virt_boundary_mask = (1 << pgsz) - 1;
+}
+
+static void mpi3mr_configure_tgt_dev(struct mpi3mr_tgt_dev *tgt_dev,
+		struct queue_limits *lim)
+{
+	if (tgt_dev->dev_type == MPI3_DEVICE_DEVFORM_PCIE &&
+	    (tgt_dev->dev_spec.pcie_inf.dev_info &
+	     MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_MASK) ==
+			MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_NVME_DEVICE)
+		mpi3mr_configure_nvme_dev(tgt_dev, lim);
+}
+
 /**
  * mpi3mr_update_sdev - Update SCSI device information
  * @sdev: SCSI device reference
@@ -1001,31 +1020,17 @@ static void
 mpi3mr_update_sdev(struct scsi_device *sdev, void *data)
 {
 	struct mpi3mr_tgt_dev *tgtdev;
+	struct queue_limits lim;
 
 	tgtdev = (struct mpi3mr_tgt_dev *)data;
 	if (!tgtdev)
 		return;
 
 	mpi3mr_change_queue_depth(sdev, tgtdev->q_depth);
-	switch (tgtdev->dev_type) {
-	case MPI3_DEVICE_DEVFORM_PCIE:
-		/*The block layer hw sector size = 512*/
-		if ((tgtdev->dev_spec.pcie_inf.dev_info &
-		    MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_MASK) ==
-		    MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_NVME_DEVICE) {
-			blk_queue_max_hw_sectors(sdev->request_queue,
-			    tgtdev->dev_spec.pcie_inf.mdts / 512);
-			if (tgtdev->dev_spec.pcie_inf.pgsz == 0)
-				blk_queue_virt_boundary(sdev->request_queue,
-				    ((1 << MPI3MR_DEFAULT_PGSZEXP) - 1));
-			else
-				blk_queue_virt_boundary(sdev->request_queue,
-				    ((1 << tgtdev->dev_spec.pcie_inf.pgsz) - 1));
-		}
-		break;
-	default:
-		break;
-	}
+
+	lim = queue_limits_start_update(sdev->request_queue);
+	mpi3mr_configure_tgt_dev(tgtdev, &lim);
+	WARN_ON_ONCE(queue_limits_commit_update(sdev->request_queue, &lim));
 }
 
 /**
@@ -1038,8 +1043,7 @@ mpi3mr_update_sdev(struct scsi_device *sdev, void *data)
  *
  * Return: Nothing.
  */
-
-void mpi3mr_rfresh_tgtdevs(struct mpi3mr_ioc *mrioc)
+static void mpi3mr_rfresh_tgtdevs(struct mpi3mr_ioc *mrioc)
 {
 	struct mpi3mr_tgt_dev *tgtdev, *tgtdev_next;
 	struct mpi3mr_stgt_priv_data *tgt_priv;
@@ -4393,15 +4397,17 @@ static void mpi3mr_target_destroy(struct scsi_target *starget)
 }
 
 /**
- * mpi3mr_slave_configure - Slave configure callback handler
+ * mpi3mr_device_configure - Slave configure callback handler
  * @sdev: SCSI device reference
+ * @lim: queue limits
  *
  * Configure queue depth, max hardware sectors and virt boundary
  * as required
  *
  * Return: 0 always.
  */
-static int mpi3mr_slave_configure(struct scsi_device *sdev)
+static int mpi3mr_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct scsi_target *starget;
 	struct Scsi_Host *shost;
@@ -4432,28 +4438,8 @@ static int mpi3mr_slave_configure(struct scsi_device *sdev)
 	sdev->eh_timeout = MPI3MR_EH_SCMD_TIMEOUT;
 	blk_queue_rq_timeout(sdev->request_queue, MPI3MR_SCMD_TIMEOUT);
 
-	switch (tgt_dev->dev_type) {
-	case MPI3_DEVICE_DEVFORM_PCIE:
-		/*The block layer hw sector size = 512*/
-		if ((tgt_dev->dev_spec.pcie_inf.dev_info &
-		    MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_MASK) ==
-		    MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_NVME_DEVICE) {
-			blk_queue_max_hw_sectors(sdev->request_queue,
-			    tgt_dev->dev_spec.pcie_inf.mdts / 512);
-			if (tgt_dev->dev_spec.pcie_inf.pgsz == 0)
-				blk_queue_virt_boundary(sdev->request_queue,
-				    ((1 << MPI3MR_DEFAULT_PGSZEXP) - 1));
-			else
-				blk_queue_virt_boundary(sdev->request_queue,
-				    ((1 << tgt_dev->dev_spec.pcie_inf.pgsz) - 1));
-		}
-		break;
-	default:
-		break;
-	}
-
+	mpi3mr_configure_tgt_dev(tgt_dev, lim);
 	mpi3mr_tgtdev_put(tgt_dev);
-
 	return retval;
 }
 
@@ -4921,7 +4907,7 @@ static const struct scsi_host_template mpi3mr_driver_template = {
 	.queuecommand			= mpi3mr_qcmd,
 	.target_alloc			= mpi3mr_target_alloc,
 	.slave_alloc			= mpi3mr_slave_alloc,
-	.slave_configure		= mpi3mr_slave_configure,
+	.device_configure		= mpi3mr_device_configure,
 	.target_destroy			= mpi3mr_target_destroy,
 	.slave_destroy			= mpi3mr_slave_destroy,
 	.scan_finished			= mpi3mr_scan_finished,
-- 
2.39.2

[PATCH 22/23] uas: switch to using ->device_configure to configure queue limits

[Christoph Hellwig]

Switch to the ->device_configure method instead of ->slave_alloc
and update the block limits on the passed in queue_limits instead
of using the per-limit accessors.

Note that uas was the only driver setting these size limits from
->slave_alloc and not ->slave_configure and this makes it match
everyone else.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/usb/storage/uas.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 0668182e1c469c..738c183ccada8d 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -823,19 +823,19 @@ static int uas_slave_alloc(struct scsi_device *sdev)
 		(struct uas_dev_info *)sdev->host->hostdata;
 
 	sdev->hostdata = devinfo;
-
-	if (devinfo->flags & US_FL_MAX_SECTORS_64)
-		blk_queue_max_hw_sectors(sdev->request_queue, 64);
-	else if (devinfo->flags & US_FL_MAX_SECTORS_240)
-		blk_queue_max_hw_sectors(sdev->request_queue, 240);
-
 	return 0;
 }
 
-static int uas_slave_configure(struct scsi_device *sdev)
+static int uas_device_configure(struct scsi_device *sdev,
+		struct queue_limits *lim)
 {
 	struct uas_dev_info *devinfo = sdev->hostdata;
 
+	if (devinfo->flags & US_FL_MAX_SECTORS_64)
+		lim->max_hw_sectors = 64;
+	else if (devinfo->flags & US_FL_MAX_SECTORS_240)
+		lim->max_hw_sectors = 240;
+
 	if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 		sdev->no_report_opcodes = 1;
 
@@ -900,7 +900,7 @@ static const struct scsi_host_template uas_host_template = {
 	.queuecommand = uas_queuecommand,
 	.target_alloc = uas_target_alloc,
 	.slave_alloc = uas_slave_alloc,
-	.slave_configure = uas_slave_configure,
+	.device_configure = uas_device_configure,
 	.eh_abort_handler = uas_eh_abort_handler,
 	.eh_device_reset_handler = uas_eh_device_reset_handler,
 	.this_id = -1,
-- 
2.39.2

[PATCH 23/23] block: remove now unused queue limits helpers

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-settings.c           | 245 ---------------------------------
 drivers/s390/block/dasd_eckd.c |   6 +-
 include/linux/blkdev.h         |  13 --
 include/linux/mmc/host.h       |   4 +-
 4 files changed, 5 insertions(+), 263 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index cdbaef159c4bc3..57cd1660815ec2 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -283,72 +283,6 @@ int queue_limits_set(struct request_queue *q, struct queue_limits *lim)
 }
 EXPORT_SYMBOL_GPL(queue_limits_set);
 
-/**
- * blk_queue_bounce_limit - set bounce buffer limit for queue
- * @q: the request queue for the device
- * @bounce: bounce limit to enforce
- *
- * Description:
- *    Force bouncing for ISA DMA ranges or highmem.
- *
- *    DEPRECATED, don't use in new code.
- **/
-void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce)
-{
-	q->limits.bounce = bounce;
-}
-EXPORT_SYMBOL(blk_queue_bounce_limit);
-
-/**
- * blk_queue_max_hw_sectors - set max sectors for a request for this queue
- * @q:  the request queue for the device
- * @max_hw_sectors:  max hardware sectors in the usual 512b unit
- *
- * Description:
- *    Enables a low level driver to set a hard upper limit,
- *    max_hw_sectors, on the size of requests.  max_hw_sectors is set by
- *    the device driver based upon the capabilities of the I/O
- *    controller.
- *
- *    max_dev_sectors is a hard limit imposed by the storage device for
- *    READ/WRITE requests. It is set by the disk driver.
- *
- *    max_sectors is a soft limit imposed by the block layer for
- *    filesystem type requests.  This value can be overridden on a
- *    per-device basis in /sys/block/<device>/queue/max_sectors_kb.
- *    The soft limit can not exceed max_hw_sectors.
- **/
-void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
-{
-	struct queue_limits *limits = &q->limits;
-	unsigned int max_sectors;
-
-	if ((max_hw_sectors << 9) < PAGE_SIZE) {
-		max_hw_sectors = 1 << (PAGE_SHIFT - 9);
-		pr_info("%s: set to minimum %u\n", __func__, max_hw_sectors);
-	}
-
-	max_hw_sectors = round_down(max_hw_sectors,
-				    limits->logical_block_size >> SECTOR_SHIFT);
-	limits->max_hw_sectors = max_hw_sectors;
-
-	max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors);
-
-	if (limits->max_user_sectors)
-		max_sectors = min(max_sectors, limits->max_user_sectors);
-	else
-		max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS_CAP);
-
-	max_sectors = round_down(max_sectors,
-				 limits->logical_block_size >> SECTOR_SHIFT);
-	limits->max_sectors = max_sectors;
-
-	if (!q->disk)
-		return;
-	q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9);
-}
-EXPORT_SYMBOL(blk_queue_max_hw_sectors);
-
 /**
  * blk_queue_chunk_sectors - set size of the chunk for this queue
  * @q:  the request queue for the device
@@ -435,65 +369,6 @@ void blk_queue_max_zone_append_sectors(struct request_queue *q,
 }
 EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors);
 
-/**
- * blk_queue_max_segments - set max hw segments for a request for this queue
- * @q:  the request queue for the device
- * @max_segments:  max number of segments
- *
- * Description:
- *    Enables a low level driver to set an upper limit on the number of
- *    hw data segments in a request.
- **/
-void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
-{
-	if (!max_segments) {
-		max_segments = 1;
-		pr_info("%s: set to minimum %u\n", __func__, max_segments);
-	}
-
-	q->limits.max_segments = max_segments;
-}
-EXPORT_SYMBOL(blk_queue_max_segments);
-
-/**
- * blk_queue_max_discard_segments - set max segments for discard requests
- * @q:  the request queue for the device
- * @max_segments:  max number of segments
- *
- * Description:
- *    Enables a low level driver to set an upper limit on the number of
- *    segments in a discard request.
- **/
-void blk_queue_max_discard_segments(struct request_queue *q,
-		unsigned short max_segments)
-{
-	q->limits.max_discard_segments = max_segments;
-}
-EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments);
-
-/**
- * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
- * @q:  the request queue for the device
- * @max_size:  max size of segment in bytes
- *
- * Description:
- *    Enables a low level driver to set an upper limit on the size of a
- *    coalesced segment
- **/
-void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size)
-{
-	if (max_size < PAGE_SIZE) {
-		max_size = PAGE_SIZE;
-		pr_info("%s: set to minimum %u\n", __func__, max_size);
-	}
-
-	/* see blk_queue_virt_boundary() for the explanation */
-	WARN_ON_ONCE(q->limits.virt_boundary_mask);
-
-	q->limits.max_segment_size = max_size;
-}
-EXPORT_SYMBOL(blk_queue_max_segment_size);
-
 /**
  * blk_queue_logical_block_size - set logical block size for the queue
  * @q:  the request queue for the device
@@ -660,29 +535,6 @@ void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt)
 }
 EXPORT_SYMBOL(blk_limits_io_opt);
 
-/**
- * blk_queue_io_opt - set optimal request size for the queue
- * @q:	the request queue for the device
- * @opt:  optimal request size in bytes
- *
- * Description:
- *   Storage devices may report an optimal I/O size, which is the
- *   device's preferred unit for sustained I/O.  This is rarely reported
- *   for disk drives.  For RAID arrays it is usually the stripe width or
- *   the internal track size.  A properly aligned multiple of
- *   optimal_io_size is the preferred request size for workloads where
- *   sustained throughput is desired.
- */
-void blk_queue_io_opt(struct request_queue *q, unsigned int opt)
-{
-	blk_limits_io_opt(&q->limits, opt);
-	if (!q->disk)
-		return;
-	q->disk->bdi->ra_pages =
-		max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);
-}
-EXPORT_SYMBOL(blk_queue_io_opt);
-
 static int queue_limit_alignment_offset(const struct queue_limits *lim,
 		sector_t sector)
 {
@@ -932,81 +784,6 @@ void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask)
 }
 EXPORT_SYMBOL(blk_queue_update_dma_pad);
 
-/**
- * blk_queue_segment_boundary - set boundary rules for segment merging
- * @q:  the request queue for the device
- * @mask:  the memory boundary mask
- **/
-void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask)
-{
-	if (mask < PAGE_SIZE - 1) {
-		mask = PAGE_SIZE - 1;
-		pr_info("%s: set to minimum %lx\n", __func__, mask);
-	}
-
-	q->limits.seg_boundary_mask = mask;
-}
-EXPORT_SYMBOL(blk_queue_segment_boundary);
-
-/**
- * blk_queue_virt_boundary - set boundary rules for bio merging
- * @q:  the request queue for the device
- * @mask:  the memory boundary mask
- **/
-void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask)
-{
-	q->limits.virt_boundary_mask = mask;
-
-	/*
-	 * Devices that require a virtual boundary do not support scatter/gather
-	 * I/O natively, but instead require a descriptor list entry for each
-	 * page (which might not be idential to the Linux PAGE_SIZE).  Because
-	 * of that they are not limited by our notion of "segment size".
-	 */
-	if (mask)
-		q->limits.max_segment_size = UINT_MAX;
-}
-EXPORT_SYMBOL(blk_queue_virt_boundary);
-
-/**
- * blk_queue_dma_alignment - set dma length and memory alignment
- * @q:     the request queue for the device
- * @mask:  alignment mask
- *
- * description:
- *    set required memory and length alignment for direct dma transactions.
- *    this is used when building direct io requests for the queue.
- *
- **/
-void blk_queue_dma_alignment(struct request_queue *q, int mask)
-{
-	q->limits.dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_dma_alignment);
-
-/**
- * blk_queue_update_dma_alignment - update dma length and memory alignment
- * @q:     the request queue for the device
- * @mask:  alignment mask
- *
- * description:
- *    update required memory and length alignment for direct dma transactions.
- *    If the requested alignment is larger than the current alignment, then
- *    the current queue alignment is updated to the new value, otherwise it
- *    is left alone.  The design of this is to allow multiple objects
- *    (driver, device, transport etc) to set their respective
- *    alignments without having them interfere.
- *
- **/
-void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
-{
-	BUG_ON(mask > PAGE_SIZE);
-
-	if (mask > q->limits.dma_alignment)
-		q->limits.dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_update_dma_alignment);
-
 /**
  * blk_set_queue_depth - tell the block layer about the device queue depth
  * @q:		the request queue for the device
@@ -1060,28 +837,6 @@ void blk_queue_required_elevator_features(struct request_queue *q,
 }
 EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features);
 
-/**
- * blk_queue_can_use_dma_map_merging - configure queue for merging segments.
- * @q:		the request queue for the device
- * @dev:	the device pointer for dma
- *
- * Tell the block layer about merging the segments by dma map of @q.
- */
-bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
-				       struct device *dev)
-{
-	unsigned long boundary = dma_get_merge_boundary(dev);
-
-	if (!boundary)
-		return false;
-
-	/* No need to update max_segment_size. see blk_queue_virt_boundary() */
-	blk_queue_virt_boundary(q, boundary);
-
-	return true;
-}
-EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
-
 /**
  * disk_set_zoned - inidicate a zoned device
  * @disk:	gendisk to configure
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 180a008d38eaaf..2f16f543079b4f 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -4561,9 +4561,9 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
 	len_to_track_end = 0;
 	/*
 	 * A tidaw can address 4k of memory, but must not cross page boundaries
-	 * We can let the block layer handle this by setting
-	 * blk_queue_segment_boundary to page boundaries and
-	 * blk_max_segment_size to page size when setting up the request queue.
+	 * We can let the block layer handle this by setting seg_boundary_mask
+	 * to page boundaries and max_segment_size to page size when setting up
+	 * the request queue.
 	 * For write requests, a TIDAW must not cross track boundaries, because
 	 * we have to set the CBC flag on the last tidaw for each track.
 	 */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c3e8f7cf96be9e..7a1e96c5bb1106 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -895,15 +895,9 @@ int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
 /*
  * Access functions for manipulating queue properties
  */
-void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
-extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
-extern void blk_queue_max_segments(struct request_queue *, unsigned short);
-extern void blk_queue_max_discard_segments(struct request_queue *,
-		unsigned short);
 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
 		unsigned int max_sectors);
-extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
 extern void blk_queue_max_discard_sectors(struct request_queue *q,
 		unsigned int max_discard_sectors);
 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
@@ -920,7 +914,6 @@ void disk_update_readahead(struct gendisk *disk);
 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
-extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
 extern void blk_set_stacking_limits(struct queue_limits *lim);
 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
@@ -928,10 +921,6 @@ extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,
 		sector_t offset, const char *pfx);
 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
-extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
-extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
-extern void blk_queue_dma_alignment(struct request_queue *, int);
-extern void blk_queue_update_dma_alignment(struct request_queue *, int);
 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
 
@@ -948,8 +937,6 @@ void disk_set_independent_access_ranges(struct gendisk *disk,
 
 extern void blk_queue_required_elevator_features(struct request_queue *q,
 						 unsigned int features);
-extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
-					      struct device *dev);
 
 bool __must_check blk_get_queue(struct request_queue *);
 extern void blk_put_queue(struct request_queue *);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 5894bf912f7bdb..88c6a76042ee73 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -433,8 +433,8 @@ struct mmc_host {
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
 	/* host specific block data */
-	unsigned int		max_seg_size;	/* see blk_queue_max_segment_size */
-	unsigned short		max_segs;	/* see blk_queue_max_segments */
+	unsigned int		max_seg_size;	/* lim->max_segment_size */
+	unsigned short		max_segs;	/* lim->max_segments */
 	unsigned short		unused;
 	unsigned int		max_req_size;	/* maximum number of bytes in one req */
 	unsigned int		max_blk_size;	/* maximum size of one mmc block */
-- 
2.39.2

Re: [PATCH 01/23] block: don't reject too large max_user_setors in blk_validate_limits

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> We already cap down the actual max_sectors to the max of the hardware
> and user limit, so don't reject the configuration.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 02/23] bsg: pass queue_limits to bsg_setup_queue

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> This allows bsg_setup_queue to pass them to blk_mq_alloc_queue and thus
> set up the limits at queue allocation time.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 03/23] mpi3mr: pass queue_limits to bsg_setup_queue

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Pass the limits to bsg_setup_queue instead of setting them up on the live
> queue.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 04/23] scsi: initialize scsi midlayer limits before allocating the queue

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Turn __scsi_init_queue into scsi_init_limits which initializes
> queue_limits structure that can be passed to blk_mq_alloc_queue.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 05/23] scsi_transport_fc: add a max_bsg_segments field to struct fc_function_template

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> ibmvfc only supports a single segment for BSG FC passthrough.  Instead of
> having it set a queue limits after creating the BSD queues, add a field so
> that the FC transport can set it before allocating the queue.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 06/23] scsi: add a no_highmem flag to struct Scsi_Host

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> While we really should be killing the block layer bounce buffering ASAP,
> I even more urgently need to stop the drivers to fiddle with the limits
> from ->slave_configure.  Add a no_highmem flag to the Scsi_Host to
> centralize this setting and switch the remaining four drivers that use
> block layer bounce buffering to it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

The USB hunks could probably be moved to their own patch following this one ?
But otherwise, looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 07/23] scsi: add a dma_alignment field to the host and host template

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Get drivers out of the business of having to call the block layer
> dma alignment limits helpers themselves.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 08/23] ufs-exynos: move setting the the dma alignment to the init method

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Use the SCSI host's dma_alignment field and set it in ->init and remove
> the now unused config_scsi_dev method.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch scsi_add_lun to use the atomic queue limits API to update the
> max_hw_sectors for devices with quirks.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 10/23] scsi: add a device_configure method to the host template

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> This is a version of ->slave_configure that also takes a queue_limits
> structure that the caller applies, and thus allows drivers to reconfigure
> the queue using the atomic queue limits API.
> 
> In the long run it should also replace ->slave_configure entirely as
> there is no need to have two different methods here, and the slave
> name in addition to being politically charged also has no basis in
> the SCSI standards or the kernel code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/scsi/scsi_scan.c | 33 +++++++++++++++++++--------------
>  include/scsi/scsi_host.h |  4 ++++
>  2 files changed, 23 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index 699356d7d17545..8e05780f802523 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -227,7 +227,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
>  
>  	/*
>  	 * realloc if new shift is calculated, which is caused by setting
> -	 * up one new default queue depth after calling ->slave_configure
> +	 * up one new default queue depth after calling ->device_configure
>  	 */
>  	if (!need_alloc && new_shift != sdev->budget_map.shift)
>  		need_alloc = need_free = true;
> @@ -874,8 +874,9 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
>  static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>  		blist_flags_t *bflags, int async)
>  {
> +	const struct scsi_host_template *hostt = sdev->host->hostt;
>  	struct queue_limits lim;
> -	int ret;
> +	int ret, ret2;
>  
>  	/*
>  	 * XXX do not save the inquiry, since it can change underneath us,
> @@ -1073,22 +1074,26 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>  		lim.max_hw_sectors = 512;
>  	else if (*bflags & BLIST_MAX_1024)
>  		lim.max_hw_sectors = 1024;
> -	ret = queue_limits_commit_update(sdev->request_queue, &lim);
> +
> +	if (hostt->device_configure)
> +		ret = hostt->device_configure(sdev, &lim);
> +	else if (hostt->slave_configure)
> +		ret = hostt->slave_configure(sdev);
> +
> +	ret2 = queue_limits_commit_update(sdev->request_queue, &lim);

Why do this if ->device_configure() or ->slave_configure() failed ?
Shouldn't the "if (ret) goto fail" hunk be moved above this call ?

> diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
> index b0948ab69e0fa6..1959193d47e7f5 100644
> --- a/include/scsi/scsi_host.h
> +++ b/include/scsi/scsi_host.h
> @@ -211,7 +211,11 @@ struct scsi_host_template {
>  	 *     up after yourself before returning non-0
>  	 *
>  	 * Status: OPTIONAL
> +	 *
> +	 * Note: slave_configure is the legacy version, use device_configure for
> +	 * all new code.

Maybe explictly mention that both *cannot* be defined here ?

>  	 */
> +	int (* device_configure)(struct scsi_device *, struct queue_limits *lim);
>  	int (* slave_configure)(struct scsi_device *);
>  
>  	/*

With these 2 nits addressed, looks all goo to me. Feel free to add:

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 11/23] megaraid_sas: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 12/23] mpt3sas: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 13/23] sbp2: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 14/23] hptiop: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 15/23] ipr: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 16/23] pmcraid: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 17/23] usb-storage: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Also use the proper atomic queue limit update helpers and freeze the
> queue when updating max_hw_sectors from sysfs.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 18/23] sata_nv: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Acked-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 19/23] pata_macio: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Acked-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 20/23] libata: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me. For the ata bits:

Acked-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 21/23] mpi3mr: switch to using ->device_configure

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Note that mpi3mr also updates the limits from an event handler that
> iterates all SCSI devices.  This is also updated to use the
> queue_limits, but the complete locking of this path probably means
> it already is completely broken and needs a proper audit.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 22/23] uas: switch to using ->device_configure to configure queue limits

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_alloc
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Note that uas was the only driver setting these size limits from
> ->slave_alloc and not ->slave_configure and this makes it match
> everyone else.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 23/23] block: remove now unused queue limits helpers

[Damien Le Moal]

On 3/25/24 08:54, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research

Re: [PATCH 01/23] block: don't reject too large max_user_setors in blk_validate_limits

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:

/s/max_user_setors/max_user_sectors/

> We already cap down the actual max_sectors to the max of the hardware
> and user limit, so don't reject the configuration.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

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

> ---
>   block/blk-settings.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/block/blk-settings.c b/block/blk-settings.c
> index 3c7d8d638ab59d..cdbaef159c4bc3 100644
> --- a/block/blk-settings.c
> +++ b/block/blk-settings.c
> @@ -146,8 +146,7 @@ static int blk_validate_limits(struct queue_limits *lim)
>   	max_hw_sectors = min_not_zero(lim->max_hw_sectors,
>   				lim->max_dev_sectors);
>   	if (lim->max_user_sectors) {
> -		if (lim->max_user_sectors > max_hw_sectors ||
> -		    lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)
> +		if (lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)
>   			return -EINVAL;
>   		lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors);
>   	} else {

Re: [PATCH 04/23] scsi: initialize scsi midlayer limits before allocating the queue

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> Turn __scsi_init_queue into scsi_init_limits which initializes
> queue_limits structure that can be passed to blk_mq_alloc_queue.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 02/23] bsg: pass queue_limits to bsg_setup_queue

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> This allows bsg_setup_queue to pass them to blk_mq_alloc_queue and thus
> set up the limits at queue allocation time.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 10/23] scsi: add a device_configure method to the host template

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> This is a version of ->slave_configure that also takes a queue_limits
> structure that the caller applies, and thus allows drivers to reconfigure
> the queue using the atomic queue limits API.
> 
> In the long run it should also replace ->slave_configure entirely as
> there is no need to have two different methods here, and the slave
> name in addition to being politically charged also has no basis in
> the SCSI standards or the kernel code.

There are two methods with names that are politically charged:
slave_configure() and slave_alloc(). Shouldn't both be renamed?

>   	 * Status: OPTIONAL
> +	 *
> +	 * Note: slave_configure is the legacy version, use device_configure for
> +	 * all new code.
>   	 */
> +	int (* device_configure)(struct scsi_device *, struct queue_limits *lim);
>   	int (* slave_configure)(struct scsi_device *);

The name "device_configure" may make people wonder whether that method
perhaps configures a struct device instance. How about using the name
"sdev_configure" instead of "device_configure" to make it more clear
that this method is used to configure a SCSI device?

Thanks,

Bart.

Re: [PATCH 23/23] block: remove now unused queue limits helpers

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> Switch scsi_add_lun to use the atomic queue limits API to update the
> max_hw_sectors for devices with quirks.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 07/23] scsi: add a dma_alignment field to the host and host template

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> Get drivers out of the business of having to call the block layer
> dma alignment limits helpers themselves.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 08/23] ufs-exynos: move setting the the dma alignment to the init method

[Bart Van Assche]

On 3/24/24 16:54, Christoph Hellwig wrote:
> Use the SCSI host's dma_alignment field and set it in ->init and remove
> the now unused config_scsi_dev method.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 06/23] scsi: add a no_highmem flag to struct Scsi_Host

[Christoph Hellwig]

On Mon, Mar 25, 2024 at 04:26:55PM +0900, Damien Le Moal wrote:
> On 3/25/24 08:54, Christoph Hellwig wrote:
> > While we really should be killing the block layer bounce buffering ASAP,
> > I even more urgently need to stop the drivers to fiddle with the limits
> > from ->slave_configure.  Add a no_highmem flag to the Scsi_Host to
> > centralize this setting and switch the remaining four drivers that use
> > block layer bounce buffering to it.
> > 
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> The USB hunks could probably be moved to their own patch following this one ?

Seems like a bit too much churn to me.

Re: [PATCH 10/23] scsi: add a device_configure method to the host template

[Christoph Hellwig]

On Mon, Mar 25, 2024 at 01:35:08PM -0700, Bart Van Assche wrote:
> There are two methods with names that are politically charged:
> slave_configure() and slave_alloc(). Shouldn't both be renamed?

Probably.  This series howerver doesn't actually renames anything,
it just adds a new method that takes the queue_limits and avoids the
name while we're at it.

> The name "device_configure" may make people wonder whether that method
> perhaps configures a struct device instance. How about using the name
> "sdev_configure" instead of "device_configure" to make it more clear
> that this method is used to configure a SCSI device?

I think device_ is probably better as it matches the target_ naming.
I could live with sdev_ if everyone else would prefer it.

Re: [PATCH 10/23] scsi: add a device_configure method to the host template

[Christoph Hellwig]

On Mon, Mar 25, 2024 at 04:38:43PM +0900, Damien Le Moal wrote:
> > +	if (hostt->device_configure)
> > +		ret = hostt->device_configure(sdev, &lim);
> > +	else if (hostt->slave_configure)
> > +		ret = hostt->slave_configure(sdev);
> > +
> > +	ret2 = queue_limits_commit_update(sdev->request_queue, &lim);
> 
> Why do this if ->device_configure() or ->slave_configure() failed ?
> Shouldn't the "if (ret) goto fail" hunk be moved above this call ?

queue_limits_commit_update unlocks the limits lock, which we'd
otherwise leak.  We could have a queue_limits_commit_abort, but
it seems a bit pointless.

> > +	 *
> > +	 * Note: slave_configure is the legacy version, use device_configure for
> > +	 * all new code.
> 
> Maybe explictly mention that both *cannot* be defined here ?

Will do.

Re: [PATCH 13/23] sbp2: switch to using ->device_configure

[Takashi Sakamoto]

Hi,

On Mon, Mar 25, 2024 at 07:54:38AM +0800, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/firewire/sbp2.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)

I'm not good at any kind of storage protocol, thus execute me not to
review it. My concern is which subsystem provides the change to mainline.
I don't mind it is your subsystem.


Thanks

Takashi Sakamoto

RE: [PATCH 08/23] ufs-exynos: move setting the the dma alignment to the init method

[Alim Akhtar]

Hi Christoph

> -----Original Message-----
> From: Christoph Hellwig <hch@lst.de>
> Sent: Monday, March 25, 2024 5:25 AM
> To: Jens Axboe <axboe@kernel.dk>; Martin K. Petersen
> <martin.petersen@oracle.com>
> Cc: Damien Le Moal <dlemoal@kernel.org>; Niklas Cassel
> <cassel@kernel.org>; Takashi Sakamoto <o-takashi@sakamocchi.jp>; Sathya
> Prakash <sathya.prakash@broadcom.com>; Sreekanth Reddy
> <sreekanth.reddy@broadcom.com>; Suganath Prabu Subramani <suganath-
> prabu.subramani@broadcom.com>; Juergen E. Fischer <fischer@norbit.de>;
> Xiang Chen <chenxiang66@hisilicon.com>; HighPoint Linux Team
> <linux@highpoint-tech.com>; Tyrel Datwyler <tyreld@linux.ibm.com>; Brian
> King <brking@us.ibm.com>; Lee Duncan <lduncan@suse.com>; Chris Leech
> <cleech@redhat.com>; Mike Christie <michael.christie@oracle.com>; John
> Garry <john.g.garry@oracle.com>; Jason Yan <yanaijie@huawei.com>;
> Kashyap Desai <kashyap.desai@broadcom.com>; Sumit Saxena
> <sumit.saxena@broadcom.com>; Shivasharan S
> <shivasharan.srikanteshwara@broadcom.com>; Chandrakanth patil
> <chandrakanth.patil@broadcom.com>; Jack Wang
> <jinpu.wang@cloud.ionos.com>; Nilesh Javali <njavali@marvell.com>; GR-
> QLogic-Storage-Upstream@marvell.com; Greg Kroah-Hartman
> <gregkh@linuxfoundation.org>; Alim Akhtar <alim.akhtar@samsung.com>;
> Avri Altman <avri.altman@wdc.com>; Bart Van Assche
> <bvanassche@acm.org>; Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org>; Alan Stern
> <stern@rowland.harvard.edu>; linux-block@vger.kernel.org; linux-
> ide@vger.kernel.org; linux1394-devel@lists.sourceforge.net; MPT-
> FusionLinux.pdl@broadcom.com; linux-scsi@vger.kernel.org; open-
> iscsi@googlegroups.com; megaraidlinux.pdl@broadcom.com; mpi3mr-
> linuxdrv.pdl@broadcom.com; linux-samsung-soc@vger.kernel.org; linux-
> usb@vger.kernel.org; usb-storage@lists.one-eyed-alien.net
> Subject: [PATCH 08/23] ufs-exynos: move setting the the dma alignment to
> the init method
> 
> Use the SCSI host's dma_alignment field and set it in ->init and remove
the
> now unused config_scsi_dev method.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>

>  drivers/ufs/core/ufshcd.c     | 3 ---
>  drivers/ufs/host/ufs-exynos.c | 8 ++------
>  include/ufs/ufshcd.h          | 1 -
>  3 files changed, 2 insertions(+), 10 deletions(-)
> 

Re: [PATCH 13/23] sbp2: switch to using ->device_configure

[Christoph Hellwig]

On Tue, Mar 26, 2024 at 06:30:45PM +0900, Takashi Sakamoto wrote:
> >  drivers/firewire/sbp2.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> I'm not good at any kind of storage protocol, thus execute me not to
> review it. My concern is which subsystem provides the change to mainline.
> I don't mind it is your subsystem.

The whole series should go in together, probably through the scsi tree.

Re: [PATCH 02/23] bsg: pass queue_limits to bsg_setup_queue

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:
> This allows bsg_setup_queue to pass them to blk_mq_alloc_queue and thus
> set up the limits at queue allocation time.
> 
> Signed-off-by: Christoph Hellwig<hch@lst.de>

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

Re: [PATCH 03/23] mpi3mr: pass queue_limits to bsg_setup_queue

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:

- bouncing open-iscsi@googlegroups.com

> Pass the limits to bsg_setup_queue instead of setting them up on the live
> queue.
> 
> Signed-off-by: Christoph Hellwig<hch@lst.de>

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

Re: [PATCH 04/23] scsi: initialize scsi midlayer limits before allocating the queue

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:

- bouncing open-iscsi@googlegroups.com

> Turn __scsi_init_queue into scsi_init_limits which initializes
> queue_limits structure that can be passed to blk_mq_alloc_queue.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

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

Re: [PATCH 06/23] scsi: add a no_highmem flag to struct Scsi_Host

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:
> While we really should be killing the block layer bounce buffering ASAP,
> I even more urgently need to stop the drivers to fiddle with the limits
> from ->slave_configure.  Add a no_highmem flag to the Scsi_Host to
> centralize this setting and switch the remaining four drivers that use
> block layer bounce buffering to it.
> 
> Signed-off-by: Christoph Hellwig<hch@lst.de>

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

Re: [PATCH 07/23] scsi: add a dma_alignment field to the host and host template

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:

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

> +++ b/drivers/scsi/iscsi_tcp.c
> @@ -943,6 +943,7 @@ iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
>   	shost->max_id = 0;
>   	shost->max_channel = 0;
>   	shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
> +	shost->dma_alignment = 0;
>   

nit: I am not sure that we really need to zero this, but it also seems 
needless for max_channel also ...

Re: [PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:
> Switch scsi_add_lun to use the atomic queue limits API to update the
> max_hw_sectors for devices with quirks.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Just a comment below. Apart from that:

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

> ---
>   drivers/scsi/scsi_scan.c | 49 ++++++++++++++++++++--------------------
>   1 file changed, 24 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index 205ab3b3ea89be..699356d7d17545 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -874,6 +874,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
>   static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>   		blist_flags_t *bflags, int async)
>   {
> +	struct queue_limits lim;
>   	int ret;
>   
>   	/*
> @@ -1004,19 +1005,6 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>   	if (*bflags & BLIST_SELECT_NO_ATN)
>   		sdev->select_no_atn = 1;
>   
> -	/*
> -	 * Maximum 512 sector transfer length
> -	 * broken RA4x00 Compaq Disk Array
> -	 */
> -	if (*bflags & BLIST_MAX_512)
> -		blk_queue_max_hw_sectors(sdev->request_queue, 512);
> -	/*
> -	 * Max 1024 sector transfer length for targets that report incorrect
> -	 * max/optimal lengths and relied on the old block layer safe default
> -	 */
> -	else if (*bflags & BLIST_MAX_1024)
> -		blk_queue_max_hw_sectors(sdev->request_queue, 1024);
> -
>   	/*
>   	 * Some devices may not want to have a start command automatically
>   	 * issued when a device is added.
> @@ -1077,19 +1065,22 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>   
>   	transport_configure_device(&sdev->sdev_gendev);
>   
> +	/*
> +	 * No need to freeze the queue as it isn't reachable to anyone else yet.
> +	 */
> +	lim = queue_limits_start_update(sdev->request_queue);
> +	if (*bflags & BLIST_MAX_512)
> +		lim.max_hw_sectors = 512;
> +	else if (*bflags & BLIST_MAX_1024)
> +		lim.max_hw_sectors = 1024;
> +	ret = queue_limits_commit_update(sdev->request_queue, &lim);
> +	if (ret)
> +		goto fail;
> +
>   	if (sdev->host->hostt->slave_configure) {
>   		ret = sdev->host->hostt->slave_configure(sdev);
> -		if (ret) {
> -			/*
> -			 * if LLDD reports slave not present, don't clutter
> -			 * console with alloc failure messages
> -			 */
> -			if (ret != -ENXIO) {
> -				sdev_printk(KERN_ERR, sdev,
> -					"failed to configure device\n");
Is there some reason to relocate this and have it included for other 
error paths, i.e. queue_limits_commit_update() call? It doesn't really 
tell us much to know the cause of the failure. At least previously it 
was in one location, so we knew the point of failure.

> -			}
> -			return SCSI_SCAN_NO_RESPONSE;
> -		}
> +		if (ret)
> +			goto fail;
>   
>   		/*
>   		 * The queue_depth is often changed in ->slave_configure.
> @@ -1115,8 +1106,16 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>   	 */
>   	if (!async && scsi_sysfs_add_sdev(sdev) != 0)
>   		return SCSI_SCAN_NO_RESPONSE;
> -
>   	return SCSI_SCAN_LUN_PRESENT;
> +
> +fail:
> +	/*
> +	 * If the LLDD reports LU not present, don't clutter the console with
> +	 * alloc failure messages.
> +	 */
> +	if (ret != -ENXIO)
> +		sdev_printk(KERN_ERR, sdev, "failed to configure device\n");
> +	return SCSI_SCAN_NO_RESPONSE;
>   }
>   
>   #ifdef CONFIG_SCSI_LOGGING

Re: [PATCH 07/23] scsi: add a dma_alignment field to the host and host template

[Christoph Hellwig]

On Wed, Mar 27, 2024 at 03:15:28PM +0000, John Garry wrote:
>>   	shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
>> +	shost->dma_alignment = 0;
>>   
>
> nit: I am not sure that we really need to zero this, but it also seems 
> needless for max_channel also ...

In this case we need it (at least to keep the existing behavior), as
the SCSI mid layer sets a default alignment, and iSCSI claims to have
no alignment requirements at all.

Re: [PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

[Christoph Hellwig]

On Wed, Mar 27, 2024 at 03:39:25PM +0000, John Garry wrote:
> Is there some reason to relocate this and have it included for other error 
> paths, i.e. queue_limits_commit_update() call? It doesn't really tell us 
> much to know the cause of the failure. At least previously it was in one 
> location, so we knew the point of failure.

I assumed an error message might be useful, but maybe it should indeed
be a different one.

Re : [PATCH 20/23] libata: switch to using ->device_configure

[John Garry]

On 24/03/2024 23:54, Christoph Hellwig wrote:
> Switch to the ->device_configure method instead of ->slave_configure
> and update the block limits on the passed in queue_limits instead
> of using the per-limit accessors.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: John Garry <john.g.garry@oracle.com>
>   
>   extern struct ata_port_operations ahci_ops;
>   extern struct ata_port_operations ahci_platform_ops;
> diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
> index 0fb1934875f208..98780d3b2f1c1a 100644
> --- a/drivers/ata/libata-sata.c
> +++ b/drivers/ata/libata-sata.c
> @@ -1170,21 +1170,23 @@ void ata_sas_tport_delete(struct ata_port *ap)
>   EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
>   
>   /**
> - *	ata_sas_slave_configure - Default slave_config routine for libata devices
> + *	ata_sas_device_configure - Default slave_config routine for libata devices

That comment about being default slave_config routine needs to be 
changed, right?

Re : [PATCH 23/23] block: remove now unused queue limits helpers

[John Garry]

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