@@ -117,6 +117,13 @@ Maximum number of elements in a DMA scatter/gather list with integrity
data that will be submitted by the block layer core to the associated
block driver.
+max_active_zones (RO)
+---------------------
+For zoned block devices (zoned attribute indicating "host-managed" or
+"host-aware"), the sum of zones belonging to any of the zone states:
+EXPLICIT OPEN, IMPLICIT OPEN or CLOSED, is limited by this value.
+If this value is 0, there is no limit.
+
max_open_zones (RO)
-------------------
For zoned block devices (zoned attribute indicating "host-managed" or
@@ -310,6 +310,11 @@ static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
return queue_var_show(queue_max_open_zones(q), page);
}
+static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(queue_max_active_zones(q), page);
+}
+
static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
{
return queue_var_show((blk_queue_nomerges(q) << 1) |
@@ -677,6 +682,11 @@ static struct queue_sysfs_entry queue_max_open_zones_entry = {
.show = queue_max_open_zones_show,
};
+static struct queue_sysfs_entry queue_max_active_zones_entry = {
+ .attr = {.name = "max_active_zones", .mode = 0444 },
+ .show = queue_max_active_zones_show,
+};
+
static struct queue_sysfs_entry queue_nomerges_entry = {
.attr = {.name = "nomerges", .mode = 0644 },
.show = queue_nomerges_show,
@@ -776,6 +786,7 @@ static struct attribute *queue_attrs[] = {
&queue_zoned_entry.attr,
&queue_nr_zones_entry.attr,
&queue_max_open_zones_entry.attr,
+ &queue_max_active_zones_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,
@@ -803,7 +814,8 @@ static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
(!q->mq_ops || !q->mq_ops->timeout))
return 0;
- if (attr == &queue_max_open_zones_entry.attr &&
+ if ((attr == &queue_max_open_zones_entry.attr ||
+ attr == &queue_max_active_zones_entry.attr) &&
!blk_queue_is_zoned(q))
return 0;
@@ -83,6 +83,7 @@ int nvme_update_zone_info(struct gendisk *disk, struct nvme_ns *ns,
q->limits.zoned = BLK_ZONED_HM;
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
blk_queue_max_open_zones(q, le32_to_cpu(id->mor) + 1);
+ blk_queue_max_active_zones(q, le32_to_cpu(id->mar) + 1);
free_data:
kfree(id);
return status;
@@ -721,6 +721,7 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
blk_queue_max_open_zones(q, 0);
else
blk_queue_max_open_zones(q, sdkp->zones_max_open);
+ blk_queue_max_active_zones(q, 0);
nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
/* READ16/WRITE16 is mandatory for ZBC disks */
@@ -521,6 +521,7 @@ struct request_queue {
unsigned long *conv_zones_bitmap;
unsigned long *seq_zones_wlock;
unsigned int max_open_zones;
+ unsigned int max_active_zones;
#endif /* CONFIG_BLK_DEV_ZONED */
/*
@@ -741,6 +742,17 @@ static inline unsigned int queue_max_open_zones(const struct request_queue *q)
{
return q->max_open_zones;
}
+
+static inline void blk_queue_max_active_zones(struct request_queue *q,
+ unsigned int max_active_zones)
+{
+ q->max_active_zones = max_active_zones;
+}
+
+static inline unsigned int queue_max_active_zones(const struct request_queue *q)
+{
+ return q->max_active_zones;
+}
#else /* CONFIG_BLK_DEV_ZONED */
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
@@ -764,6 +776,14 @@ static inline unsigned int queue_max_open_zones(const struct request_queue *q)
{
return 0;
}
+static inline void blk_queue_max_active_zones(struct request_queue *q,
+ unsigned int max_active_zones)
+{
+}
+static inline unsigned int queue_max_active_zones(const struct request_queue *q)
+{
+ return 0;
+}
#endif /* CONFIG_BLK_DEV_ZONED */
static inline bool rq_is_sync(struct request *rq)
Add a new max_active zones definition in the sysfs documentation. This definition will be common for all devices utilizing the zoned block device support in the kernel. Export max_active_zones according to this new definition for NVMe Zoned Namespace devices, ZAC ATA devices (which are treated as SCSI devices by the kernel), and ZBC SCSI devices. Add the new max_active_zones struct member to the request_queue, rather than as a queue limit, since this property cannot be split across stacking drivers. For SCSI devices, even though max active zones is not part of the ZBC/ZAC spec, export max_active_zones as 0, signifying "no limit". Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> --- Documentation/block/queue-sysfs.rst | 7 +++++++ block/blk-sysfs.c | 14 +++++++++++++- drivers/nvme/host/zns.c | 1 + drivers/scsi/sd_zbc.c | 1 + include/linux/blkdev.h | 20 ++++++++++++++++++++ 5 files changed, 42 insertions(+), 1 deletion(-)