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null_blk: add configfs variables for 2 options

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Allow setting via configfs these two options:

no_sched
shared_tag_bitmap

Previously these could only be activated as module parameters.

Still missing are:

shared_tags
timeout
requeue
init_hctx

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220708174943.87787-3-vincent.fu@samsung.com
[axboe: fold in nullb == NULL fix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Vincent Fu 2022-07-08 17:49:49 +00:00 committed by Jens Axboe
parent 058efe000b
commit 7012eef520
2 changed files with 54 additions and 23 deletions
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75
drivers/block/null_blk/main.c
View File

@ -425,6 +425,8 @@ NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL);
NULLB_DEVICE_ATTR(zone_max_open, uint, NULL);
NULLB_DEVICE_ATTR(zone_max_active, uint, NULL);
NULLB_DEVICE_ATTR(virt_boundary, bool, NULL);
NULLB_DEVICE_ATTR(no_sched, bool, NULL);
NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL);
static ssize_t nullb_device_power_show(struct config_item *item, char *page)
{
@ -548,6 +550,8 @@ static struct configfs_attribute *nullb_device_attrs[] = {
&nullb_device_attr_zone_max_open,
&nullb_device_attr_zone_max_active,
&nullb_device_attr_virt_boundary,
&nullb_device_attr_no_sched,
&nullb_device_attr_shared_tag_bitmap,
NULL,
};
@ -604,7 +608,13 @@ nullb_group_drop_item(struct config_group *group, struct config_item *item)
static ssize_t memb_group_features_show(struct config_item *item, char *page)
{
return snprintf(page, PAGE_SIZE,
"memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size,zone_capacity,zone_nr_conv,zone_max_open,zone_max_active,blocksize,max_sectors,virt_boundary\n");
"badblocks,blocking,blocksize,cache_size,"
"completion_nsec,discard,home_node,hw_queue_depth,"
"irqmode,max_sectors,mbps,memory_backed,no_sched,"
"poll_queues,power,queue_mode,shared_tag_bitmap,size,"
"submit_queues,use_per_node_hctx,virt_boundary,zoned,"
"zone_capacity,zone_max_active,zone_max_open,"
"zone_nr_conv,zone_size\n");
}
CONFIGFS_ATTR_RO(memb_group_, features);
@ -678,6 +688,8 @@ static struct nullb_device *null_alloc_dev(void)
dev->zone_max_open = g_zone_max_open;
dev->zone_max_active = g_zone_max_active;
dev->virt_boundary = g_virt_boundary;
dev->no_sched = g_no_sched;
dev->shared_tag_bitmap = g_shared_tag_bitmap;
return dev;
}
@ -1885,31 +1897,48 @@ static int null_gendisk_register(struct nullb *nullb)
static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
{
unsigned int flags = BLK_MQ_F_SHOULD_MERGE;
int hw_queues, numa_node;
unsigned int queue_depth;
int poll_queues;
set->ops = &null_mq_ops;
set->nr_hw_queues = nullb ? nullb->dev->submit_queues :
g_submit_queues;
poll_queues = nullb ? nullb->dev->poll_queues : g_poll_queues;
if (poll_queues)
set->nr_hw_queues += poll_queues;
set->queue_depth = nullb ? nullb->dev->hw_queue_depth :
g_hw_queue_depth;
set->numa_node = nullb ? nullb->dev->home_node : g_home_node;
set->cmd_size = sizeof(struct nullb_cmd);
set->flags = BLK_MQ_F_SHOULD_MERGE;
if (g_no_sched)
set->flags |= BLK_MQ_F_NO_SCHED;
if (g_shared_tag_bitmap)
set->flags |= BLK_MQ_F_TAG_HCTX_SHARED;
set->driver_data = nullb;
if (poll_queues)
set->nr_maps = 3;
else
set->nr_maps = 1;
if (nullb) {
hw_queues = nullb->dev->submit_queues;
poll_queues = nullb->dev->poll_queues;
queue_depth = nullb->dev->hw_queue_depth;
numa_node = nullb->dev->home_node;
if (nullb->dev->no_sched)
flags |= BLK_MQ_F_NO_SCHED;
if (nullb->dev->shared_tag_bitmap)
flags |= BLK_MQ_F_TAG_HCTX_SHARED;
if (nullb->dev->blocking)
flags |= BLK_MQ_F_BLOCKING;
} else {
hw_queues = g_submit_queues;
poll_queues = g_poll_queues;
queue_depth = g_hw_queue_depth;
numa_node = g_home_node;
if (g_no_sched)
flags |= BLK_MQ_F_NO_SCHED;
if (g_shared_tag_bitmap)
flags |= BLK_MQ_F_TAG_HCTX_SHARED;
if (g_blocking)
flags |= BLK_MQ_F_BLOCKING;
}
if ((nullb && nullb->dev->blocking) || g_blocking)
set->flags |= BLK_MQ_F_BLOCKING;
set->ops = &null_mq_ops;
set->cmd_size = sizeof(struct nullb_cmd);
set->flags = flags;
set->driver_data = nullb;
set->nr_hw_queues = hw_queues;
set->queue_depth = queue_depth;
set->numa_node = numa_node;
if (poll_queues) {
set->nr_hw_queues += poll_queues;
set->nr_maps = 3;
} else {
set->nr_maps = 1;
}
return blk_mq_alloc_tag_set(set);
}

2
drivers/block/null_blk/null_blk.h
View File

@ -113,6 +113,8 @@ struct nullb_device {
bool discard; /* if support discard */
bool zoned; /* if device is zoned */
bool virt_boundary; /* virtual boundary on/off for the device */
bool no_sched; /* no IO scheduler for the device */
bool shared_tag_bitmap; /* use hostwide shared tags */
};
struct nullb {