convert nvme to atomic queue limits updates v2

convert nvme to atomic queue limits updates v2

[Christoph Hellwig]

Hi all,

this series converts nvme to the new atomic queue limit updates, and
as part of that refactors a lot of the setup code.  The first two
patches are block layer patches already sent out as part of the md
queue limits conversion and will hopefully get merged into Jens' tree
soon.

Changes since v1:
 - also set GENHD_FL_HIDDEN on the multipath gendisk for unknown command
   sets
 - use the queue_limits_* API for multipath device stacking
 - update the admin queue limits after reading in the MDTS value

Diffstat:
 core.c      |  393 ++++++++++++++++++++++++++++++------------------------------
 multipath.c |   13 +
 nvme.h      |   11 -
 zns.c       |   24 +--
 4 files changed, 218 insertions(+), 223 deletions(-)

[PATCH 01/16] nvme: set max_hw_sectors unconditionally

[Christoph Hellwig]

All transports set a max_hw_sectors value in the nvme_ctrl, so make
the code using it unconditional and clean it up using a little helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index cb13f7c79eaf9c..6ae9aedf7bc278 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1944,19 +1944,19 @@ static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
 	return 0;
 }
 
+static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
+{
+	return ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT) + 1;
+}
+
 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 		struct request_queue *q)
 {
 	bool vwc = ctrl->vwc & NVME_CTRL_VWC_PRESENT;
 
-	if (ctrl->max_hw_sectors) {
-		u32 max_segments =
-			(ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> 9)) + 1;
-
-		max_segments = min_not_zero(max_segments, ctrl->max_segments);
-		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
-		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
-	}
+	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
+	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
+		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
 	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
 	blk_queue_dma_alignment(q, 3);
 	blk_queue_write_cache(q, vwc, vwc);
-- 
2.39.2

[PATCH 02/16] nvme: move NVME_QUIRK_DEALLOCATE_ZEROES out of nvme_config_discard

[Christoph Hellwig]

Move the handling of the NVME_QUIRK_DEALLOCATE_ZEROES quirk out of
nvme_config_discard so that it is combined with the normal write_zeroes
limit handling.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 6ae9aedf7bc278..a6c0b2f4cf796e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1816,9 +1816,6 @@ static void nvme_config_discard(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	else
 		blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
 	queue->limits.discard_granularity = queue_logical_block_size(queue);
-
-	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
-		blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
 }
 
 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
@@ -2029,8 +2026,12 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	set_capacity_and_notify(disk, capacity);
 
 	nvme_config_discard(ctrl, disk, head);
-	blk_queue_max_write_zeroes_sectors(disk->queue,
-					   ctrl->max_zeroes_sectors);
+
+	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
+		blk_queue_max_write_zeroes_sectors(disk->queue, UINT_MAX);
+	else
+		blk_queue_max_write_zeroes_sectors(disk->queue,
+				ctrl->max_zeroes_sectors);
 }
 
 static bool nvme_ns_is_readonly(struct nvme_ns *ns, struct nvme_ns_info *info)
-- 
2.39.2

[PATCH 03/16] nvme: remove nvme_revalidate_zones

[Christoph Hellwig]

Handle setting the zone size / chunk_sectors and max_append_sectors
limits together with the other ZNS limits, and just open code the
call to blk_revalidate_zones in the current place.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/nvme/host/core.c |  2 +-
 drivers/nvme/host/nvme.h |  1 -
 drivers/nvme/host/zns.c  | 12 ++----------
 3 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a6c0b2f4cf796e..2817eea07e967d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2154,7 +2154,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	blk_mq_unfreeze_queue(ns->disk->queue);
 
 	if (blk_queue_is_zoned(ns->queue)) {
-		ret = nvme_revalidate_zones(ns);
+		ret = blk_revalidate_disk_zones(ns->disk, NULL);
 		if (ret && !nvme_first_scan(ns->disk))
 			goto out;
 	}
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 4a484fc8a073c8..01e8bae7886584 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1036,7 +1036,6 @@ static inline bool nvme_disk_is_ns_head(struct gendisk *disk)
 }
 #endif /* CONFIG_NVME_MULTIPATH */
 
-int nvme_revalidate_zones(struct nvme_ns *ns);
 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
 		unsigned int nr_zones, report_zones_cb cb, void *data);
 #ifdef CONFIG_BLK_DEV_ZONED
diff --git a/drivers/nvme/host/zns.c b/drivers/nvme/host/zns.c
index 499bbb0eee8d09..852261d7891362 100644
--- a/drivers/nvme/host/zns.c
+++ b/drivers/nvme/host/zns.c
@@ -7,16 +7,6 @@
 #include <linux/vmalloc.h>
 #include "nvme.h"
 
-int nvme_revalidate_zones(struct nvme_ns *ns)
-{
-	struct request_queue *q = ns->queue;
-
-	blk_queue_chunk_sectors(q, ns->head->zsze);
-	blk_queue_max_zone_append_sectors(q, ns->ctrl->max_zone_append);
-
-	return blk_revalidate_disk_zones(ns->disk, NULL);
-}
-
 static int nvme_set_max_append(struct nvme_ctrl *ctrl)
 {
 	struct nvme_command c = { };
@@ -113,6 +103,8 @@ int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
 	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
 	disk_set_max_open_zones(ns->disk, le32_to_cpu(id->mor) + 1);
 	disk_set_max_active_zones(ns->disk, le32_to_cpu(id->mar) + 1);
+	blk_queue_chunk_sectors(ns->queue, ns->head->zsze);
+	blk_queue_max_zone_append_sectors(ns->queue, ns->ctrl->max_zone_append);
 free_data:
 	kfree(id);
 	return status;
-- 
2.39.2

[PATCH 04/16] nvme: move max_integrity_segments handling out of nvme_init_integrity

[Christoph Hellwig]

max_integrity_segments is just a hardware limit and doesn't need to be
in nvme_init_integrity with the PI setup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 2817eea07e967d..c4a268d91796f2 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1724,8 +1724,7 @@ int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 }
 
 #ifdef CONFIG_BLK_DEV_INTEGRITY
-static void nvme_init_integrity(struct gendisk *disk,
-		struct nvme_ns_head *head, u32 max_integrity_segments)
+static void nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 {
 	struct blk_integrity integrity = { };
 
@@ -1773,11 +1772,9 @@ static void nvme_init_integrity(struct gendisk *disk,
 	integrity.tuple_size = head->ms;
 	integrity.pi_offset = head->pi_offset;
 	blk_integrity_register(disk, &integrity);
-	blk_queue_max_integrity_segments(disk->queue, max_integrity_segments);
 }
 #else
-static void nvme_init_integrity(struct gendisk *disk,
-		struct nvme_ns_head *head, u32 max_integrity_segments)
+static void nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 {
 }
 #endif /* CONFIG_BLK_DEV_INTEGRITY */
@@ -1954,6 +1951,7 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
 	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
 		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
+	blk_queue_max_integrity_segments(q, ctrl->max_integrity_segments);
 	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
 	blk_queue_dma_alignment(q, 3);
 	blk_queue_write_cache(q, vwc, vwc);
@@ -2017,8 +2015,7 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	if (head->ms) {
 		if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
 		    (head->features & NVME_NS_METADATA_SUPPORTED))
-			nvme_init_integrity(disk, head,
-					    ctrl->max_integrity_segments);
+			nvme_init_integrity(disk, head);
 		else if (!nvme_ns_has_pi(head))
 			capacity = 0;
 	}
-- 
2.39.2

[PATCH 05/16] nvme: cleanup the nvme_init_integrity calling conventions

[Christoph Hellwig]

Handle the no metadata support case in nvme_init_integrity as well to
simplify the calling convention and prepare for future changes in the
area.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c4a268d91796f2..1ecddb6f5ad9eb 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1723,11 +1723,21 @@ int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 	return 0;
 }
 
-#ifdef CONFIG_BLK_DEV_INTEGRITY
-static void nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
+static bool nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 {
 	struct blk_integrity integrity = { };
 
+	if (!head->ms)
+		return true;
+
+	/*
+	 * PI can always be supported as we can ask the controller to simply
+	 * insert/strip it, which is not possible for other kinds of metadata.
+	 */
+	if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) ||
+	    !(head->features & NVME_NS_METADATA_SUPPORTED))
+		return nvme_ns_has_pi(head);
+
 	switch (head->pi_type) {
 	case NVME_NS_DPS_PI_TYPE3:
 		switch (head->guard_type) {
@@ -1772,12 +1782,8 @@ static void nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 	integrity.tuple_size = head->ms;
 	integrity.pi_offset = head->pi_offset;
 	blk_integrity_register(disk, &integrity);
+	return true;
 }
-#else
-static void nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
-{
-}
-#endif /* CONFIG_BLK_DEV_INTEGRITY */
 
 static void nvme_config_discard(struct nvme_ctrl *ctrl, struct gendisk *disk,
 		struct nvme_ns_head *head)
@@ -2012,13 +2018,8 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	 * I/O to namespaces with metadata except when the namespace supports
 	 * PI, as it can strip/insert in that case.
 	 */
-	if (head->ms) {
-		if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
-		    (head->features & NVME_NS_METADATA_SUPPORTED))
-			nvme_init_integrity(disk, head);
-		else if (!nvme_ns_has_pi(head))
-			capacity = 0;
-	}
+	if (!nvme_init_integrity(disk, head))
+		capacity = 0;
 
 	set_capacity_and_notify(disk, capacity);
 
-- 
2.39.2

[PATCH 06/16] nvme: move blk_integrity_unregister into nvme_init_integrity

[Christoph Hellwig]

Move uneregistering the existing integrity profile into the helper
dealing with all the other integrity / metadata setup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1ecddb6f5ad9eb..40fab7c47eae24 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1727,6 +1727,8 @@ static bool nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 {
 	struct blk_integrity integrity = { };
 
+	blk_integrity_unregister(disk);
+
 	if (!head->ms)
 		return true;
 
@@ -1980,8 +1982,6 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 		bs = (1 << 9);
 	}
 
-	blk_integrity_unregister(disk);
-
 	atomic_bs = phys_bs = bs;
 	if (id->nabo == 0) {
 		/*
-- 
2.39.2

[PATCH 07/16] nvme: don't use nvme_update_disk_info for the multipath disk

[Christoph Hellwig]

Currently nvme_update_ns_info_block calls nvme_update_disk_info both for
the namespace attached disk, and the multipath one (if it exists).  This
is very different from how other stacking drivers work, and leads to
a lot of complexity.

Switch to setting the disk capacity and initializing the integrity
profile, and let blk_stack_limits which already is called just below
deal with updating the other limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 40fab7c47eae24..d356f3fa2cf8eb 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2159,7 +2159,8 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 
 	if (nvme_ns_head_multipath(ns->head)) {
 		blk_mq_freeze_queue(ns->head->disk->queue);
-		nvme_update_disk_info(ns->ctrl, ns->head->disk, ns->head, id);
+		nvme_init_integrity(ns->head->disk, ns->head);
+		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
 		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
 		nvme_mpath_revalidate_paths(ns);
 		blk_stack_limits(&ns->head->disk->queue->limits,
-- 
2.39.2

[PATCH 08/16] nvme: move a few things out of nvme_update_disk_info

[Christoph Hellwig]

Move setting up the integrity profile and setting the disk capacity out
of nvme_update_disk_info to get nvme_update_disk_info into a shape where
it just sets queue_limits eventually.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 46 +++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 20 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d356f3fa2cf8eb..63c2b581f7859e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1965,12 +1965,13 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 	blk_queue_write_cache(q, vwc, vwc);
 }
 
-static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
-		struct nvme_ns_head *head, struct nvme_id_ns *id)
+static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id)
 {
-	sector_t capacity = nvme_lba_to_sect(head, le64_to_cpu(id->nsze));
+	struct gendisk *disk = ns->disk;
+	struct nvme_ns_head *head = ns->head;
 	u32 bs = 1U << head->lba_shift;
 	u32 atomic_bs, phys_bs, io_opt = 0;
+	bool valid = true;
 
 	/*
 	 * The block layer can't support LBA sizes larger than the page size
@@ -1978,8 +1979,8 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	 * allow block I/O.
 	 */
 	if (head->lba_shift > PAGE_SHIFT || head->lba_shift < SECTOR_SHIFT) {
-		capacity = 0;
 		bs = (1 << 9);
+		valid = false;
 	}
 
 	atomic_bs = phys_bs = bs;
@@ -1992,7 +1993,7 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 		if (id->nsfeat & NVME_NS_FEAT_ATOMICS && id->nawupf)
 			atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
 		else
-			atomic_bs = (1 + ctrl->subsys->awupf) * bs;
+			atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
 	}
 
 	if (id->nsfeat & NVME_NS_FEAT_IO_OPT) {
@@ -2012,24 +2013,14 @@ static void nvme_update_disk_info(struct nvme_ctrl *ctrl, struct gendisk *disk,
 	blk_queue_io_min(disk->queue, phys_bs);
 	blk_queue_io_opt(disk->queue, io_opt);
 
-	/*
-	 * Register a metadata profile for PI, or the plain non-integrity NVMe
-	 * metadata masquerading as Type 0 if supported, otherwise reject block
-	 * I/O to namespaces with metadata except when the namespace supports
-	 * PI, as it can strip/insert in that case.
-	 */
-	if (!nvme_init_integrity(disk, head))
-		capacity = 0;
-
-	set_capacity_and_notify(disk, capacity);
-
-	nvme_config_discard(ctrl, disk, head);
+	nvme_config_discard(ns->ctrl, disk, head);
 
-	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
+	if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
 		blk_queue_max_write_zeroes_sectors(disk->queue, UINT_MAX);
 	else
 		blk_queue_max_write_zeroes_sectors(disk->queue,
-				ctrl->max_zeroes_sectors);
+				ns->ctrl->max_zeroes_sectors);
+	return valid;
 }
 
 static bool nvme_ns_is_readonly(struct nvme_ns *ns, struct nvme_ns_info *info)
@@ -2103,6 +2094,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		struct nvme_ns_info *info)
 {
 	struct nvme_id_ns *id;
+	sector_t capacity;
 	unsigned lbaf;
 	int ret;
 
@@ -2121,6 +2113,8 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	lbaf = nvme_lbaf_index(id->flbas);
 	ns->head->lba_shift = id->lbaf[lbaf].ds;
 	ns->head->nuse = le64_to_cpu(id->nuse);
+	capacity = nvme_lba_to_sect(ns->head, le64_to_cpu(id->nsze));
+
 	nvme_set_queue_limits(ns->ctrl, ns->queue);
 
 	ret = nvme_configure_metadata(ns->ctrl, ns->head, id);
@@ -2129,7 +2123,19 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		goto out;
 	}
 	nvme_set_chunk_sectors(ns, id);
-	nvme_update_disk_info(ns->ctrl, ns->disk, ns->head, id);
+	if (!nvme_update_disk_info(ns, id))
+		capacity = 0;
+
+	/*
+	 * Register a metadata profile for PI, or the plain non-integrity NVMe
+	 * metadata masquerading as Type 0 if supported, otherwise reject block
+	 * I/O to namespaces with metadata except when the namespace supports
+	 * PI, as it can strip/insert in that case.
+	 */
+	if (!nvme_init_integrity(ns->disk, ns->head))
+		capacity = 0;
+
+	set_capacity_and_notify(ns->disk, capacity);
 
 	if (ns->head->ids.csi == NVME_CSI_ZNS) {
 		ret = nvme_update_zone_info(ns, lbaf);
-- 
2.39.2

[PATCH 09/16] nvme: move setting the write cache flags out of nvme_set_queue_limits

[Christoph Hellwig]

nvme_set_queue_limits is used on the admin queue and all gendisks
including hidden ones that don't support block I/O.  The write cache
setting on the other hand only makes sense for block I/O.  Move the
blk_queue_write_cache call to nvme_update_ns_info_block instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 63c2b581f7859e..ce70bfb66242e2 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1954,15 +1954,12 @@ static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 		struct request_queue *q)
 {
-	bool vwc = ctrl->vwc & NVME_CTRL_VWC_PRESENT;
-
 	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
 	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
 		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
 	blk_queue_max_integrity_segments(q, ctrl->max_integrity_segments);
 	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
 	blk_queue_dma_alignment(q, 3);
-	blk_queue_write_cache(q, vwc, vwc);
 }
 
 static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id)
@@ -2093,6 +2090,7 @@ static int nvme_update_ns_info_generic(struct nvme_ns *ns,
 static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		struct nvme_ns_info *info)
 {
+	bool vwc = ns->ctrl->vwc & NVME_CTRL_VWC_PRESENT;
 	struct nvme_id_ns *id;
 	sector_t capacity;
 	unsigned lbaf;
@@ -2154,6 +2152,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	if ((id->dlfeat & 0x7) == 0x1 && (id->dlfeat & (1 << 3)))
 		ns->head->features |= NVME_NS_DEAC;
 	set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
+	blk_queue_write_cache(ns->disk->queue, vwc, vwc);
 	set_bit(NVME_NS_READY, &ns->flags);
 	blk_mq_unfreeze_queue(ns->disk->queue);
 
-- 
2.39.2

[PATCH 10/16] nvme: move common logic into nvme_update_ns_info

[Christoph Hellwig]

nvme_update_ns_info_generic and nvme_update_ns_info_block share a
fair amount of logic related to not fully supported namespace
formats and updating the multipath information.  Move this logic
into the common caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 84 ++++++++++++++++++++--------------------
 1 file changed, 42 insertions(+), 42 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ce70bfb66242e2..f0686a872d0e30 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2070,21 +2070,8 @@ static int nvme_update_ns_info_generic(struct nvme_ns *ns,
 	set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
 	blk_mq_unfreeze_queue(ns->disk->queue);
 
-	if (nvme_ns_head_multipath(ns->head)) {
-		blk_mq_freeze_queue(ns->head->disk->queue);
-		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
-		nvme_mpath_revalidate_paths(ns);
-		blk_stack_limits(&ns->head->disk->queue->limits,
-				 &ns->queue->limits, 0);
-		ns->head->disk->flags |= GENHD_FL_HIDDEN;
-		blk_mq_unfreeze_queue(ns->head->disk->queue);
-	}
-
 	/* Hide the block-interface for these devices */
-	ns->disk->flags |= GENHD_FL_HIDDEN;
-	set_bit(NVME_NS_READY, &ns->flags);
-
-	return 0;
+	return -ENODEV;
 }
 
 static int nvme_update_ns_info_block(struct nvme_ns *ns,
@@ -2104,7 +2091,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		/* namespace not allocated or attached */
 		info->is_removed = true;
 		ret = -ENODEV;
-		goto error;
+		goto out;
 	}
 
 	blk_mq_freeze_queue(ns->disk->queue);
@@ -2162,54 +2149,67 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 			goto out;
 	}
 
-	if (nvme_ns_head_multipath(ns->head)) {
-		blk_mq_freeze_queue(ns->head->disk->queue);
-		nvme_init_integrity(ns->head->disk, ns->head);
-		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
-		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
-		nvme_mpath_revalidate_paths(ns);
-		blk_stack_limits(&ns->head->disk->queue->limits,
-				 &ns->queue->limits, 0);
-		disk_update_readahead(ns->head->disk);
-		blk_mq_unfreeze_queue(ns->head->disk->queue);
-	}
-
 	ret = 0;
 out:
-	/*
-	 * If probing fails due an unsupported feature, hide the block device,
-	 * but still allow other access.
-	 */
-	if (ret == -ENODEV) {
-		ns->disk->flags |= GENHD_FL_HIDDEN;
-		set_bit(NVME_NS_READY, &ns->flags);
-		ret = 0;
-	}
-
-error:
 	kfree(id);
 	return ret;
 }
 
 static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
 {
+	bool unsupported = false;
+	int ret;
+
 	switch (info->ids.csi) {
 	case NVME_CSI_ZNS:
 		if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED)) {
 			dev_info(ns->ctrl->device,
 	"block device for nsid %u not supported without CONFIG_BLK_DEV_ZONED\n",
 				info->nsid);
-			return nvme_update_ns_info_generic(ns, info);
+			ret = nvme_update_ns_info_generic(ns, info);
+			break;
 		}
-		return nvme_update_ns_info_block(ns, info);
+		ret = nvme_update_ns_info_block(ns, info);
+		break;
 	case NVME_CSI_NVM:
-		return nvme_update_ns_info_block(ns, info);
+		ret = nvme_update_ns_info_block(ns, info);
+		break;
 	default:
 		dev_info(ns->ctrl->device,
 			"block device for nsid %u not supported (csi %u)\n",
 			info->nsid, info->ids.csi);
-		return nvme_update_ns_info_generic(ns, info);
+		ret = nvme_update_ns_info_generic(ns, info);
+		break;
 	}
+
+	/*
+	 * If probing fails due an unsupported feature, hide the block device,
+	 * but still allow other access.
+	 */
+	if (ret == -ENODEV) {
+		ns->disk->flags |= GENHD_FL_HIDDEN;
+		set_bit(NVME_NS_READY, &ns->flags);
+		unsupported = true;
+		ret = 0;
+	}
+
+	if (!ret && nvme_ns_head_multipath(ns->head)) {
+		blk_mq_freeze_queue(ns->head->disk->queue);
+		if (unsupported)
+			ns->head->disk->flags |= GENHD_FL_HIDDEN;
+		else
+			nvme_init_integrity(ns->head->disk, ns->head);
+		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
+		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
+		nvme_mpath_revalidate_paths(ns);
+		blk_stack_limits(&ns->head->disk->queue->limits,
+				 &ns->queue->limits, 0);
+
+		disk_update_readahead(ns->head->disk);
+		blk_mq_unfreeze_queue(ns->head->disk->queue);
+	}
+
+	return ret;
 }
 
 #ifdef CONFIG_BLK_SED_OPAL
-- 
2.39.2

[PATCH 11/16] nvme: split out a nvme_identify_ns_nvm helper

[Christoph Hellwig]

Split the logic to query the Identify Namespace Data Structure, NVM
Command Set into a separate helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
 drivers/nvme/host/core.c | 38 ++++++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index f0686a872d0e30..9abcc389f0f3ae 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1831,12 +1831,35 @@ static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
 		a->csi == b->csi;
 }
 
+static int nvme_identify_ns_nvm(struct nvme_ctrl *ctrl, unsigned int nsid,
+		struct nvme_id_ns_nvm **nvmp)
+{
+	struct nvme_command c = {
+		.identify.opcode	= nvme_admin_identify,
+		.identify.nsid		= cpu_to_le32(nsid),
+		.identify.cns		= NVME_ID_CNS_CS_NS,
+		.identify.csi		= NVME_CSI_NVM,
+	};
+	struct nvme_id_ns_nvm *nvm;
+	int ret;
+
+	nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
+	if (!nvm)
+		return -ENOMEM;
+
+	ret = nvme_submit_sync_cmd(ctrl->admin_q, &c, nvm, sizeof(*nvm));
+	if (ret)
+		kfree(nvm);
+	else
+		*nvmp = nvm;
+	return ret;
+}
+
 static int nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
 		struct nvme_id_ns *id)
 {
 	bool first = id->dps & NVME_NS_DPS_PI_FIRST;
 	unsigned lbaf = nvme_lbaf_index(id->flbas);
-	struct nvme_command c = { };
 	struct nvme_id_ns_nvm *nvm;
 	int ret = 0;
 	u32 elbaf;
@@ -1849,18 +1872,9 @@ static int nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
 		goto set_pi;
 	}
 
-	nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
-	if (!nvm)
-		return -ENOMEM;
-
-	c.identify.opcode = nvme_admin_identify;
-	c.identify.nsid = cpu_to_le32(head->ns_id);
-	c.identify.cns = NVME_ID_CNS_CS_NS;
-	c.identify.csi = NVME_CSI_NVM;
-
-	ret = nvme_submit_sync_cmd(ctrl->admin_q, &c, nvm, sizeof(*nvm));
+	ret = nvme_identify_ns_nvm(ctrl, head->ns_id, &nvm);
 	if (ret)
-		goto free_data;
+		goto set_pi;
 
 	elbaf = le32_to_cpu(nvm->elbaf[lbaf]);
 
-- 
2.39.2

[PATCH 12/16] nvme: don't query identify data in configure_metadata

[Christoph Hellwig]

Move reading the Identify Namespace Data Structure, NVM Command Set out
of configure_metadata into the caller.  This allows doing the identify
call outside the frozen I/O queues, and prepares for using data from
the Identify data structure for other purposes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 49 ++++++++++++++++------------------------
 1 file changed, 19 insertions(+), 30 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9abcc389f0f3ae..a742fa10dd3091 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1855,32 +1855,26 @@ static int nvme_identify_ns_nvm(struct nvme_ctrl *ctrl, unsigned int nsid,
 	return ret;
 }
 
-static int nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
-		struct nvme_id_ns *id)
+static void nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
+		struct nvme_id_ns *id, struct nvme_id_ns_nvm *nvm)
 {
 	bool first = id->dps & NVME_NS_DPS_PI_FIRST;
 	unsigned lbaf = nvme_lbaf_index(id->flbas);
-	struct nvme_id_ns_nvm *nvm;
-	int ret = 0;
 	u32 elbaf;
 
 	head->pi_size = 0;
 	head->ms = le16_to_cpu(id->lbaf[lbaf].ms);
-	if (!(ctrl->ctratt & NVME_CTRL_ATTR_ELBAS)) {
+	if (!nvm || !(ctrl->ctratt & NVME_CTRL_ATTR_ELBAS)) {
 		head->pi_size = sizeof(struct t10_pi_tuple);
 		head->guard_type = NVME_NVM_NS_16B_GUARD;
 		goto set_pi;
 	}
 
-	ret = nvme_identify_ns_nvm(ctrl, head->ns_id, &nvm);
-	if (ret)
-		goto set_pi;
-
 	elbaf = le32_to_cpu(nvm->elbaf[lbaf]);
 
 	/* no support for storage tag formats right now */
 	if (nvme_elbaf_sts(elbaf))
-		goto free_data;
+		goto set_pi;
 
 	head->guard_type = nvme_elbaf_guard_type(elbaf);
 	switch (head->guard_type) {
@@ -1894,8 +1888,6 @@ static int nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
 		break;
 	}
 
-free_data:
-	kfree(nvm);
 set_pi:
 	if (head->pi_size && head->ms >= head->pi_size)
 		head->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
@@ -1906,22 +1898,17 @@ static int nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
 		head->pi_offset = 0;
 	else
 		head->pi_offset = head->ms - head->pi_size;
-
-	return ret;
 }
 
-static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
-		struct nvme_ns_head *head, struct nvme_id_ns *id)
+static void nvme_configure_metadata(struct nvme_ctrl *ctrl,
+		struct nvme_ns_head *head, struct nvme_id_ns *id,
+		struct nvme_id_ns_nvm *nvm)
 {
-	int ret;
-
-	ret = nvme_init_ms(ctrl, head, id);
-	if (ret)
-		return ret;
+	nvme_init_ms(ctrl, head, id, nvm);
 
 	head->features &= ~(NVME_NS_METADATA_SUPPORTED | NVME_NS_EXT_LBAS);
 	if (!head->ms || !(ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
-		return 0;
+		return;
 
 	if (ctrl->ops->flags & NVME_F_FABRICS) {
 		/*
@@ -1930,7 +1917,7 @@ static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
 		 * remap the separate metadata buffer from the block layer.
 		 */
 		if (WARN_ON_ONCE(!(id->flbas & NVME_NS_FLBAS_META_EXT)))
-			return 0;
+			return;
 
 		head->features |= NVME_NS_EXT_LBAS;
 
@@ -1957,7 +1944,6 @@ static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
 		else
 			head->features |= NVME_NS_METADATA_SUPPORTED;
 	}
-	return 0;
 }
 
 static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
@@ -2092,6 +2078,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		struct nvme_ns_info *info)
 {
 	bool vwc = ns->ctrl->vwc & NVME_CTRL_VWC_PRESENT;
+	struct nvme_id_ns_nvm *nvm = NULL;
 	struct nvme_id_ns *id;
 	sector_t capacity;
 	unsigned lbaf;
@@ -2108,6 +2095,12 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		goto out;
 	}
 
+	if (ns->ctrl->ctratt & NVME_CTRL_ATTR_ELBAS) {
+		ret = nvme_identify_ns_nvm(ns->ctrl, info->nsid, &nvm);
+		if (ret < 0)
+			goto out;
+	}
+
 	blk_mq_freeze_queue(ns->disk->queue);
 	lbaf = nvme_lbaf_index(id->flbas);
 	ns->head->lba_shift = id->lbaf[lbaf].ds;
@@ -2115,12 +2108,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	capacity = nvme_lba_to_sect(ns->head, le64_to_cpu(id->nsze));
 
 	nvme_set_queue_limits(ns->ctrl, ns->queue);
-
-	ret = nvme_configure_metadata(ns->ctrl, ns->head, id);
-	if (ret < 0) {
-		blk_mq_unfreeze_queue(ns->disk->queue);
-		goto out;
-	}
+	nvme_configure_metadata(ns->ctrl, ns->head, id, nvm);
 	nvme_set_chunk_sectors(ns, id);
 	if (!nvme_update_disk_info(ns, id))
 		capacity = 0;
@@ -2165,6 +2153,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 
 	ret = 0;
 out:
+	kfree(nvm);
 	kfree(id);
 	return ret;
 }
-- 
2.39.2

[PATCH 13/16] nvme: cleanup nvme_configure_metadata

[Christoph Hellwig]

Fold nvme_init_ms into nvme_configure_metadata after splitting up
a little helper to deal with the extended LBA formats.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 47 ++++++++++++++++------------------------
 1 file changed, 19 insertions(+), 28 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a742fa10dd3091..2ecdde36197017 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1855,26 +1855,14 @@ static int nvme_identify_ns_nvm(struct nvme_ctrl *ctrl, unsigned int nsid,
 	return ret;
 }
 
-static void nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
+static void nvme_configure_pi_elbas(struct nvme_ns_head *head,
 		struct nvme_id_ns *id, struct nvme_id_ns_nvm *nvm)
 {
-	bool first = id->dps & NVME_NS_DPS_PI_FIRST;
-	unsigned lbaf = nvme_lbaf_index(id->flbas);
-	u32 elbaf;
-
-	head->pi_size = 0;
-	head->ms = le16_to_cpu(id->lbaf[lbaf].ms);
-	if (!nvm || !(ctrl->ctratt & NVME_CTRL_ATTR_ELBAS)) {
-		head->pi_size = sizeof(struct t10_pi_tuple);
-		head->guard_type = NVME_NVM_NS_16B_GUARD;
-		goto set_pi;
-	}
-
-	elbaf = le32_to_cpu(nvm->elbaf[lbaf]);
+	u32 elbaf = le32_to_cpu(nvm->elbaf[nvme_lbaf_index(id->flbas)]);
 
 	/* no support for storage tag formats right now */
 	if (nvme_elbaf_sts(elbaf))
-		goto set_pi;
+		return;
 
 	head->guard_type = nvme_elbaf_guard_type(elbaf);
 	switch (head->guard_type) {
@@ -1887,29 +1875,32 @@ static void nvme_init_ms(struct nvme_ctrl *ctrl, struct nvme_ns_head *head,
 	default:
 		break;
 	}
-
-set_pi:
-	if (head->pi_size && head->ms >= head->pi_size)
-		head->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
-	else
-		head->pi_type = 0;
-
-	if (first)
-		head->pi_offset = 0;
-	else
-		head->pi_offset = head->ms - head->pi_size;
 }
 
 static void nvme_configure_metadata(struct nvme_ctrl *ctrl,
 		struct nvme_ns_head *head, struct nvme_id_ns *id,
 		struct nvme_id_ns_nvm *nvm)
 {
-	nvme_init_ms(ctrl, head, id, nvm);
-
 	head->features &= ~(NVME_NS_METADATA_SUPPORTED | NVME_NS_EXT_LBAS);
+	head->pi_type = 0;
+	head->pi_size = 0;
+	head->pi_offset = 0;
+	head->ms = le16_to_cpu(id->lbaf[nvme_lbaf_index(id->flbas)].ms);
 	if (!head->ms || !(ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
 		return;
 
+	if (nvm && (ctrl->ctratt & NVME_CTRL_ATTR_ELBAS)) {
+		nvme_configure_pi_elbas(head, id, nvm);
+	} else {
+		head->pi_size = sizeof(struct t10_pi_tuple);
+		head->guard_type = NVME_NVM_NS_16B_GUARD;
+	}
+
+	if (head->pi_size && head->ms >= head->pi_size)
+		head->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
+	if (!(id->dps & NVME_NS_DPS_PI_FIRST))
+		head->pi_offset = head->ms - head->pi_size;
+
 	if (ctrl->ops->flags & NVME_F_FABRICS) {
 		/*
 		 * The NVMe over Fabrics specification only supports metadata as
-- 
2.39.2

[PATCH 14/16] nvme: use the atomic queue limits update API

[Christoph Hellwig]

Changes the callchains that update queue_limits to build an on-stack
queue_limits and update it atomically.  Note that for now only the
admin queue actually passes it to the queue allocation function.
Doing the same for the gendisks used for the namespaces will require
a little more work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 133 ++++++++++++++++++++-------------------
 drivers/nvme/host/nvme.h |  10 +--
 drivers/nvme/host/zns.c  |  16 ++---
 3 files changed, 80 insertions(+), 79 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 2ecdde36197017..6413ce24fb4b1c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1787,40 +1787,27 @@ static bool nvme_init_integrity(struct gendisk *disk, struct nvme_ns_head *head)
 	return true;
 }
 
-static void nvme_config_discard(struct nvme_ctrl *ctrl, struct gendisk *disk,
-		struct nvme_ns_head *head)
+static void nvme_config_discard(struct nvme_ns *ns, struct queue_limits *lim)
 {
-	struct request_queue *queue = disk->queue;
-	u32 max_discard_sectors;
-
-	if (ctrl->dmrsl && ctrl->dmrsl <= nvme_sect_to_lba(head, UINT_MAX)) {
-		max_discard_sectors = nvme_lba_to_sect(head, ctrl->dmrsl);
-	} else if (ctrl->oncs & NVME_CTRL_ONCS_DSM) {
-		max_discard_sectors = UINT_MAX;
-	} else {
-		blk_queue_max_discard_sectors(queue, 0);
-		return;
-	}
+	struct nvme_ctrl *ctrl = ns->ctrl;
 
 	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
 			NVME_DSM_MAX_RANGES);
 
-	/*
-	 * If discard is already enabled, don't reset queue limits.
-	 *
-	 * This works around the fact that the block layer can't cope well with
-	 * updating the hardware limits when overridden through sysfs.  This is
-	 * harmless because discard limits in NVMe are purely advisory.
-	 */
-	if (queue->limits.max_discard_sectors)
-		return;
+	if (ctrl->dmrsl && ctrl->dmrsl <= nvme_sect_to_lba(ns->head, UINT_MAX))
+		lim->max_hw_discard_sectors =
+			nvme_lba_to_sect(ns->head, ctrl->dmrsl);
+	else if (ctrl->oncs & NVME_CTRL_ONCS_DSM)
+		lim->max_hw_discard_sectors = UINT_MAX;
+	else
+		lim->max_hw_discard_sectors = 0;
+
+	lim->discard_granularity = lim->logical_block_size;
 
-	blk_queue_max_discard_sectors(queue, max_discard_sectors);
 	if (ctrl->dmrl)
-		blk_queue_max_discard_segments(queue, ctrl->dmrl);
+		lim->max_discard_segments = ctrl->dmrl;
 	else
-		blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
-	queue->limits.discard_granularity = queue_logical_block_size(queue);
+		lim->max_discard_segments = NVME_DSM_MAX_RANGES;
 }
 
 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
@@ -1942,20 +1929,21 @@ static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
 	return ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT) + 1;
 }
 
-static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
-		struct request_queue *q)
+static void nvme_set_ctrl_limits(struct nvme_ctrl *ctrl,
+		struct queue_limits *lim)
 {
-	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
-	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
-		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
-	blk_queue_max_integrity_segments(q, ctrl->max_integrity_segments);
-	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
-	blk_queue_dma_alignment(q, 3);
+	lim->max_hw_sectors = ctrl->max_hw_sectors;
+	lim->max_segments = min_t(u32, USHRT_MAX,
+		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments));
+	lim->max_integrity_segments = ctrl->max_integrity_segments;
+	lim->virt_boundary_mask = NVME_CTRL_PAGE_SIZE - 1;
+	lim->max_segment_size = UINT_MAX;
+	lim->dma_alignment = 3;
 }
 
-static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id)
+static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id,
+		struct queue_limits *lim)
 {
-	struct gendisk *disk = ns->disk;
 	struct nvme_ns_head *head = ns->head;
 	u32 bs = 1U << head->lba_shift;
 	u32 atomic_bs, phys_bs, io_opt = 0;
@@ -1991,23 +1979,19 @@ static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id)
 		io_opt = bs * (1 + le16_to_cpu(id->nows));
 	}
 
-	blk_queue_logical_block_size(disk->queue, bs);
 	/*
 	 * Linux filesystems assume writing a single physical block is
 	 * an atomic operation. Hence limit the physical block size to the
 	 * value of the Atomic Write Unit Power Fail parameter.
 	 */
-	blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
-	blk_queue_io_min(disk->queue, phys_bs);
-	blk_queue_io_opt(disk->queue, io_opt);
-
-	nvme_config_discard(ns->ctrl, disk, head);
-
+	lim->logical_block_size = bs;
+	lim->physical_block_size = min(phys_bs, atomic_bs);
+	lim->io_min = phys_bs;
+	lim->io_opt = io_opt;
 	if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
-		blk_queue_max_write_zeroes_sectors(disk->queue, UINT_MAX);
+		lim->max_write_zeroes_sectors = UINT_MAX;
 	else
-		blk_queue_max_write_zeroes_sectors(disk->queue,
-				ns->ctrl->max_zeroes_sectors);
+		lim->max_write_zeroes_sectors = ns->ctrl->max_zeroes_sectors;
 	return valid;
 }
 
@@ -2022,7 +2006,8 @@ static inline bool nvme_first_scan(struct gendisk *disk)
 	return !disk_live(disk);
 }
 
-static void nvme_set_chunk_sectors(struct nvme_ns *ns, struct nvme_id_ns *id)
+static void nvme_set_chunk_sectors(struct nvme_ns *ns, struct nvme_id_ns *id,
+		struct queue_limits *lim)
 {
 	struct nvme_ctrl *ctrl = ns->ctrl;
 	u32 iob;
@@ -2050,25 +2035,33 @@ static void nvme_set_chunk_sectors(struct nvme_ns *ns, struct nvme_id_ns *id)
 		return;
 	}
 
-	blk_queue_chunk_sectors(ns->queue, iob);
+	lim->chunk_sectors = iob;
 }
 
 static int nvme_update_ns_info_generic(struct nvme_ns *ns,
 		struct nvme_ns_info *info)
 {
+	struct queue_limits lim;
+	int ret;
+
 	blk_mq_freeze_queue(ns->disk->queue);
-	nvme_set_queue_limits(ns->ctrl, ns->queue);
+	lim = queue_limits_start_update(ns->disk->queue);
+	nvme_set_ctrl_limits(ns->ctrl, &lim);
+	ret = queue_limits_commit_update(ns->disk->queue, &lim);
 	set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
 	blk_mq_unfreeze_queue(ns->disk->queue);
 
 	/* Hide the block-interface for these devices */
-	return -ENODEV;
+	if (!ret)
+		ret = -ENODEV;
+	return ret;
 }
 
 static int nvme_update_ns_info_block(struct nvme_ns *ns,
 		struct nvme_ns_info *info)
 {
 	bool vwc = ns->ctrl->vwc & NVME_CTRL_VWC_PRESENT;
+	struct queue_limits lim;
 	struct nvme_id_ns_nvm *nvm = NULL;
 	struct nvme_id_ns *id;
 	sector_t capacity;
@@ -2098,11 +2091,26 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	ns->head->nuse = le64_to_cpu(id->nuse);
 	capacity = nvme_lba_to_sect(ns->head, le64_to_cpu(id->nsze));
 
-	nvme_set_queue_limits(ns->ctrl, ns->queue);
+	lim = queue_limits_start_update(ns->disk->queue);
+	nvme_set_ctrl_limits(ns->ctrl, &lim);
 	nvme_configure_metadata(ns->ctrl, ns->head, id, nvm);
-	nvme_set_chunk_sectors(ns, id);
-	if (!nvme_update_disk_info(ns, id))
+	nvme_set_chunk_sectors(ns, id, &lim);
+	if (!nvme_update_disk_info(ns, id, &lim))
 		capacity = 0;
+	nvme_config_discard(ns, &lim);
+	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
+	    ns->head->ids.csi == NVME_CSI_ZNS) {
+		ret = nvme_update_zone_info(ns, lbaf, &lim);
+		if (ret) {
+			blk_mq_unfreeze_queue(ns->disk->queue);
+			goto out;
+		}
+	}
+	ret = queue_limits_commit_update(ns->disk->queue, &lim);
+	if (ret) {
+		blk_mq_unfreeze_queue(ns->disk->queue);
+		goto out;
+	}
 
 	/*
 	 * Register a metadata profile for PI, or the plain non-integrity NVMe
@@ -2115,14 +2123,6 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 
 	set_capacity_and_notify(ns->disk, capacity);
 
-	if (ns->head->ids.csi == NVME_CSI_ZNS) {
-		ret = nvme_update_zone_info(ns, lbaf);
-		if (ret) {
-			blk_mq_unfreeze_queue(ns->disk->queue);
-			goto out;
-		}
-	}
-
 	/*
 	 * Only set the DEAC bit if the device guarantees that reads from
 	 * deallocated data return zeroes.  While the DEAC bit does not
@@ -3128,6 +3128,7 @@ static int nvme_check_ctrl_fabric_info(struct nvme_ctrl *ctrl, struct nvme_id_ct
 
 static int nvme_init_identify(struct nvme_ctrl *ctrl)
 {
+	struct queue_limits lim;
 	struct nvme_id_ctrl *id;
 	u32 max_hw_sectors;
 	bool prev_apst_enabled;
@@ -3194,7 +3195,12 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
 	ctrl->max_hw_sectors =
 		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
 
-	nvme_set_queue_limits(ctrl, ctrl->admin_q);
+	lim = queue_limits_start_update(ctrl->admin_q);
+	nvme_set_ctrl_limits(ctrl, &lim);
+	ret = queue_limits_commit_update(ctrl->admin_q, &lim);
+	if (ret)
+		goto out_free;
+
 	ctrl->sgls = le32_to_cpu(id->sgls);
 	ctrl->kas = le16_to_cpu(id->kas);
 	ctrl->max_namespaces = le32_to_cpu(id->mnan);
@@ -4357,6 +4363,7 @@ EXPORT_SYMBOL_GPL(nvme_complete_async_event);
 int nvme_alloc_admin_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 		const struct blk_mq_ops *ops, unsigned int cmd_size)
 {
+	struct queue_limits lim = {};
 	int ret;
 
 	memset(set, 0, sizeof(*set));
@@ -4376,7 +4383,7 @@ int nvme_alloc_admin_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 	if (ret)
 		return ret;
 
-	ctrl->admin_q = blk_mq_alloc_queue(set, NULL, NULL);
+	ctrl->admin_q = blk_mq_alloc_queue(set, &lim, NULL);
 	if (IS_ERR(ctrl->admin_q)) {
 		ret = PTR_ERR(ctrl->admin_q);
 		goto out_free_tagset;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 01e8bae7886584..27397f8404d65d 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1038,8 +1038,9 @@ static inline bool nvme_disk_is_ns_head(struct gendisk *disk)
 
 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
 		unsigned int nr_zones, report_zones_cb cb, void *data);
+int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf,
+		struct queue_limits *lim);
 #ifdef CONFIG_BLK_DEV_ZONED
-int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf);
 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
 				       struct nvme_command *cmnd,
 				       enum nvme_zone_mgmt_action action);
@@ -1050,13 +1051,6 @@ static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
 {
 	return BLK_STS_NOTSUPP;
 }
-
-static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
-{
-	dev_warn(ns->ctrl->device,
-		 "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n");
-	return -EPROTONOSUPPORT;
-}
 #endif
 
 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
diff --git a/drivers/nvme/host/zns.c b/drivers/nvme/host/zns.c
index 852261d7891362..722384bcc765cd 100644
--- a/drivers/nvme/host/zns.c
+++ b/drivers/nvme/host/zns.c
@@ -35,10 +35,10 @@ static int nvme_set_max_append(struct nvme_ctrl *ctrl)
 	return 0;
 }
 
-int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
+int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf,
+		struct queue_limits *lim)
 {
 	struct nvme_effects_log *log = ns->head->effects;
-	struct request_queue *q = ns->queue;
 	struct nvme_command c = { };
 	struct nvme_id_ns_zns *id;
 	int status;
@@ -99,12 +99,12 @@ int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
 		goto free_data;
 	}
 
-	disk_set_zoned(ns->disk);
-	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
-	disk_set_max_open_zones(ns->disk, le32_to_cpu(id->mor) + 1);
-	disk_set_max_active_zones(ns->disk, le32_to_cpu(id->mar) + 1);
-	blk_queue_chunk_sectors(ns->queue, ns->head->zsze);
-	blk_queue_max_zone_append_sectors(ns->queue, ns->ctrl->max_zone_append);
+	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, ns->queue);
+	lim->zoned = 1;
+	lim->max_open_zones = le32_to_cpu(id->mor) + 1;
+	lim->max_active_zones = le32_to_cpu(id->mar) + 1;
+	lim->chunk_sectors = ns->head->zsze;
+	lim->max_zone_append_sectors = ns->ctrl->max_zone_append;
 free_data:
 	kfree(id);
 	return status;
-- 
2.39.2

[PATCH 15/16] nvme-multipath: pass queue_limits to blk_alloc_disk

[Christoph Hellwig]

The multipath disk starts out with the stacking default limits.
The one interesting part here is that blk_set_stacking_limits
sets the max_zone_append_sectorts to UINT_MAX, which fails the
validation for non-zoned devices.  With the old one call per
limit scheme this was fine because no one verified this weird
mismatch and it was fixed by blk_stack_limits a little later
before I/O could be issued.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/multipath.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index dc5d0d0a82d0e2..5397fb428b242c 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -516,6 +516,7 @@ static void nvme_requeue_work(struct work_struct *work)
 
 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 {
+	struct queue_limits lim;
 	bool vwc = false;
 
 	mutex_init(&head->lock);
@@ -532,7 +533,12 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 	    !nvme_is_unique_nsid(ctrl, head) || !multipath)
 		return 0;
 
-	head->disk = blk_alloc_disk(NULL, ctrl->numa_node);
+	blk_set_stacking_limits(&lim);
+	lim.dma_alignment = 3;
+	if (head->ids.csi != NVME_CSI_ZNS)
+		lim.max_zone_append_sectors = 0;
+
+	head->disk = blk_alloc_disk(&lim, ctrl->numa_node);
 	if (IS_ERR(head->disk))
 		return PTR_ERR(head->disk);
 	head->disk->fops = &nvme_ns_head_ops;
@@ -553,11 +559,6 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 	    ctrl->tagset->map[HCTX_TYPE_POLL].nr_queues)
 		blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue);
 
-	/* set to a default value of 512 until the disk is validated */
-	blk_queue_logical_block_size(head->disk->queue, 512);
-	blk_set_stacking_limits(&head->disk->queue->limits);
-	blk_queue_dma_alignment(head->disk->queue, 3);
-
 	/* we need to propagate up the VMC settings */
 	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
 		vwc = true;
-- 
2.39.2

[PATCH 16/16] nvme-multipath: use atomic queue limits API for stacking limits

[Christoph Hellwig]

Switch to the queue_limits_* helpers to stack the bdev limits, which also
includes updating the readahead settings.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 6413ce24fb4b1c..3f985b93a19f98 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2188,6 +2188,8 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
 	}
 
 	if (!ret && nvme_ns_head_multipath(ns->head)) {
+		struct queue_limits lim;
+
 		blk_mq_freeze_queue(ns->head->disk->queue);
 		if (unsupported)
 			ns->head->disk->flags |= GENHD_FL_HIDDEN;
@@ -2196,10 +2198,11 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
 		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
 		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
 		nvme_mpath_revalidate_paths(ns);
-		blk_stack_limits(&ns->head->disk->queue->limits,
-				 &ns->queue->limits, 0);
 
-		disk_update_readahead(ns->head->disk);
+		lim = queue_limits_start_update(ns->head->disk->queue);
+		queue_limits_stack_bdev(&lim, ns->disk->part0, 0,
+					ns->head->disk->disk_name);
+		ret = queue_limits_commit_update(ns->head->disk->queue, &lim);
 		blk_mq_unfreeze_queue(ns->head->disk->queue);
 	}
 
-- 
2.39.2

Re: [PATCH 01/16] nvme: set max_hw_sectors unconditionally

[John Garry]

return ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT) + 1;
On 04/03/2024 14:04, Christoph Hellwig wrote:
> All transports set a max_hw_sectors value in the nvme_ctrl, so make
> the code using it unconditional and clean it up using a little helper.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>

FWIW, but I do have a small comment, below:

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

> ---
>   drivers/nvme/host/core.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index cb13f7c79eaf9c..6ae9aedf7bc278 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1944,19 +1944,19 @@ static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
>   	return 0;
>   }
>   
> +static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
> +{
> +	return ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT) + 1;

I think that it would be nicer to keep the parenthesis, like:

return (ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT)) + 1;

> +}
> +
>   static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
>   		struct request_queue *q)
>   {
>   	bool vwc = ctrl->vwc & NVME_CTRL_VWC_PRESENT;
>   
> -	if (ctrl->max_hw_sectors) {
> -		u32 max_segments =
> -			(ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> 9)) + 1;
> -
> -		max_segments = min_not_zero(max_segments, ctrl->max_segments);
> -		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
> -		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
> -	}
> +	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
> +	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
> +		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
>   	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
>   	blk_queue_dma_alignment(q, 3);
>   	blk_queue_write_cache(q, vwc, vwc);

Re: convert nvme to atomic queue limits updates v2

[Keith Busch]

Thanks, applied to nvme-6.9.

Re: convert nvme to atomic queue limits updates v2

[Sagi Grimberg]

On 04/03/2024 18:27, Keith Busch wrote:
> Thanks, applied to nvme-6.9.

FWIW,

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

Re: [PATCH 14/16] nvme: use the atomic queue limits update API

[Kanchan Joshi]

On 3/4/2024 7:34 PM, Christoph Hellwig wrote:
> @@ -2098,11 +2091,26 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
>   	ns->head->nuse = le64_to_cpu(id->nuse);
>   	capacity = nvme_lba_to_sect(ns->head, le64_to_cpu(id->nsze));
>   
> -	nvme_set_queue_limits(ns->ctrl, ns->queue);
> +	lim = queue_limits_start_update(ns->disk->queue);
> +	nvme_set_ctrl_limits(ns->ctrl, &lim);
>   	nvme_configure_metadata(ns->ctrl, ns->head, id, nvm);
> -	nvme_set_chunk_sectors(ns, id);
> -	if (!nvme_update_disk_info(ns, id))
> +	nvme_set_chunk_sectors(ns, id, &lim);
> +	if (!nvme_update_disk_info(ns, id, &lim))
>   		capacity = 0;
> +	nvme_config_discard(ns, &lim);
> +	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
> +	    ns->head->ids.csi == NVME_CSI_ZNS) {
> +		ret = nvme_update_zone_info(ns, lbaf, &lim);
> +		if (ret) {
> +			blk_mq_unfreeze_queue(ns->disk->queue);
> +			goto out;
> +		}
> +	}
> +	ret = queue_limits_commit_update(ns->disk->queue, &lim);
> +	if (ret) {
> +		blk_mq_unfreeze_queue(ns->disk->queue);
> +		goto out;
> +	}

Not sure if this has been discussed already.
But do we need something that does not update the limit but still 
releases the mutex (q->limits_lock)?
If nvme_update_zone_info() returns error, the mutex will not be released.

Re: [PATCH 14/16] nvme: use the atomic queue limits update API

[Christoph Hellwig]

On Tue, Mar 26, 2024 at 03:54:49PM +0530, Kanchan Joshi wrote:
> > +	ret = queue_limits_commit_update(ns->disk->queue, &lim);
> > +	if (ret) {
> > +		blk_mq_unfreeze_queue(ns->disk->queue);
> > +		goto out;
> > +	}
> 
> Not sure if this has been discussed already.
> But do we need something that does not update the limit but still 
> releases the mutex (q->limits_lock)?
> If nvme_update_zone_info() returns error, the mutex will not be released.

It just came up in the scsi series..

Maybe we'll want a cancel_update version after all.  I thought I'd get
away without it.