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path: root/drivers/block/null_blk/main.c
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Diffstat (limited to 'drivers/block/null_blk/main.c')
-rw-r--r--drivers/block/null_blk/main.c108
1 files changed, 82 insertions, 26 deletions
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 8b224ede2e33..c451c477978f 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -201,6 +201,22 @@ static bool g_use_per_node_hctx;
module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444);
MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");
+static bool g_memory_backed;
+module_param_named(memory_backed, g_memory_backed, bool, 0444);
+MODULE_PARM_DESC(memory_backed, "Create a memory-backed block device. Default: false");
+
+static bool g_discard;
+module_param_named(discard, g_discard, bool, 0444);
+MODULE_PARM_DESC(discard, "Support discard operations (requires memory-backed null_blk device). Default: false");
+
+static unsigned long g_cache_size;
+module_param_named(cache_size, g_cache_size, ulong, 0444);
+MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)");
+
+static unsigned int g_mbps;
+module_param_named(mbps, g_mbps, uint, 0444);
+MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)");
+
static bool g_zoned;
module_param_named(zoned, g_zoned, bool, S_IRUGO);
MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false");
@@ -409,6 +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)
{
@@ -532,6 +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,
};
@@ -588,7 +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);
@@ -650,6 +676,10 @@ static struct nullb_device *null_alloc_dev(void)
dev->irqmode = g_irqmode;
dev->hw_queue_depth = g_hw_queue_depth;
dev->blocking = g_blocking;
+ dev->memory_backed = g_memory_backed;
+ dev->discard = g_discard;
+ dev->cache_size = g_cache_size;
+ dev->mbps = g_mbps;
dev->use_per_node_hctx = g_use_per_node_hctx;
dev->zoned = g_zoned;
dev->zone_size = g_zone_size;
@@ -658,6 +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;
}
@@ -1655,7 +1687,7 @@ static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
static void cleanup_queue(struct nullb_queue *nq)
{
- kfree(nq->tag_map);
+ bitmap_free(nq->tag_map);
kfree(nq->cmds);
}
@@ -1782,14 +1814,13 @@ static const struct block_device_operations null_rq_ops = {
static int setup_commands(struct nullb_queue *nq)
{
struct nullb_cmd *cmd;
- int i, tag_size;
+ int i;
nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL);
if (!nq->cmds)
return -ENOMEM;
- tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG;
- nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL);
+ nq->tag_map = bitmap_zalloc(nq->queue_depth, GFP_KERNEL);
if (!nq->tag_map) {
kfree(nq->cmds);
return -ENOMEM;
@@ -1866,31 +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;
+ 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;
+ }
+
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->flags = flags;
set->driver_data = nullb;
- if (poll_queues)
+ 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
+ } else {
set->nr_maps = 1;
-
- if ((nullb && nullb->dev->blocking) || g_blocking)
- set->flags |= BLK_MQ_F_BLOCKING;
+ }
return blk_mq_alloc_tag_set(set);
}
@@ -2042,8 +2090,13 @@ static int null_add_dev(struct nullb_device *dev)
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q);
mutex_lock(&lock);
- nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL);
- dev->index = nullb->index;
+ rv = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL);
+ if (rv < 0) {
+ mutex_unlock(&lock);
+ goto out_cleanup_zone;
+ }
+ nullb->index = rv;
+ dev->index = rv;
mutex_unlock(&lock);
blk_queue_logical_block_size(nullb->q, dev->blocksize);
@@ -2069,7 +2122,7 @@ static int null_add_dev(struct nullb_device *dev)
rv = null_gendisk_register(nullb);
if (rv)
- goto out_cleanup_zone;
+ goto out_ida_free;
mutex_lock(&lock);
list_add_tail(&nullb->list, &nullb_list);
@@ -2078,6 +2131,9 @@ static int null_add_dev(struct nullb_device *dev)
pr_info("disk %s created\n", nullb->disk_name);
return 0;
+
+out_ida_free:
+ ida_free(&nullb_indexes, nullb->index);
out_cleanup_zone:
null_free_zoned_dev(dev);
out_cleanup_disk:
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-03 04:10:34 +0000