unsigned long *tag_map;
wait_queue_head_t wait;
unsigned int queue_depth;
+ struct nullb_device *dev;
struct nullb_cmd *cmds;
};
+struct nullb_device {
+ struct nullb *nullb;
+
+ unsigned long size; /* device size in MB */
+ unsigned long completion_nsec; /* time in ns to complete a request */
+ unsigned int submit_queues; /* number of submission queues */
+ unsigned int home_node; /* home node for the device */
+ unsigned int queue_mode; /* block interface */
+ unsigned int blocksize; /* block size */
+ unsigned int irqmode; /* IRQ completion handler */
+ unsigned int hw_queue_depth; /* queue depth */
+ bool use_lightnvm; /* register as a LightNVM device */
+ bool blocking; /* blocking blk-mq device */
+ bool use_per_node_hctx; /* use per-node allocation for hardware context */
+};
+
struct nullb {
+ struct nullb_device *dev;
struct list_head list;
unsigned int index;
struct request_queue *q;
NULL_Q_MQ = 2,
};
-static int submit_queues = 1;
-module_param(submit_queues, int, S_IRUGO);
+static int g_submit_queues = 1;
+module_param_named(submit_queues, g_submit_queues, int, S_IRUGO);
MODULE_PARM_DESC(submit_queues, "Number of submission queues");
-static int home_node = NUMA_NO_NODE;
-module_param(home_node, int, S_IRUGO);
+static int g_home_node = NUMA_NO_NODE;
+module_param_named(home_node, g_home_node, int, S_IRUGO);
MODULE_PARM_DESC(home_node, "Home node for the device");
-static int queue_mode = NULL_Q_MQ;
+static int g_queue_mode = NULL_Q_MQ;
static int null_param_store_val(const char *str, int *val, int min, int max)
{
static int null_set_queue_mode(const char *str, const struct kernel_param *kp)
{
- return null_param_store_val(str, &queue_mode, NULL_Q_BIO, NULL_Q_MQ);
+ return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ);
}
static const struct kernel_param_ops null_queue_mode_param_ops = {
.get = param_get_int,
};
-device_param_cb(queue_mode, &null_queue_mode_param_ops, &queue_mode, S_IRUGO);
+device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, S_IRUGO);
MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)");
-static int gb = 250;
-module_param(gb, int, S_IRUGO);
+static int g_gb = 250;
+module_param_named(gb, g_gb, int, S_IRUGO);
MODULE_PARM_DESC(gb, "Size in GB");
-static int bs = 512;
-module_param(bs, int, S_IRUGO);
+static int g_bs = 512;
+module_param_named(bs, g_bs, int, S_IRUGO);
MODULE_PARM_DESC(bs, "Block size (in bytes)");
static int nr_devices = 1;
module_param(nr_devices, int, S_IRUGO);
MODULE_PARM_DESC(nr_devices, "Number of devices to register");
-static bool use_lightnvm;
-module_param(use_lightnvm, bool, S_IRUGO);
+static bool g_use_lightnvm;
+module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO);
MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device");
-static bool blocking;
-module_param(blocking, bool, S_IRUGO);
+static bool g_blocking;
+module_param_named(blocking, g_blocking, bool, S_IRUGO);
MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device");
static bool shared_tags;
module_param(shared_tags, bool, S_IRUGO);
MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq");
-static int irqmode = NULL_IRQ_SOFTIRQ;
+static int g_irqmode = NULL_IRQ_SOFTIRQ;
static int null_set_irqmode(const char *str, const struct kernel_param *kp)
{
- return null_param_store_val(str, &irqmode, NULL_IRQ_NONE,
+ return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE,
NULL_IRQ_TIMER);
}
.get = param_get_int,
};
-device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO);
+device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, S_IRUGO);
MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer");
-static unsigned long completion_nsec = 10000;
-module_param(completion_nsec, ulong, S_IRUGO);
+static unsigned long g_completion_nsec = 10000;
+module_param_named(completion_nsec, g_completion_nsec, ulong, S_IRUGO);
MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns");
-static int hw_queue_depth = 64;
-module_param(hw_queue_depth, int, S_IRUGO);
+static int g_hw_queue_depth = 64;
+module_param_named(hw_queue_depth, g_hw_queue_depth, int, S_IRUGO);
MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64");
-static bool use_per_node_hctx = false;
-module_param(use_per_node_hctx, bool, S_IRUGO);
+static bool g_use_per_node_hctx;
+module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, S_IRUGO);
MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");
+static struct nullb_device *null_alloc_dev(void)
+{
+ struct nullb_device *dev;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+ dev->size = g_gb * 1024;
+ dev->completion_nsec = g_completion_nsec;
+ dev->submit_queues = g_submit_queues;
+ dev->home_node = g_home_node;
+ dev->queue_mode = g_queue_mode;
+ dev->blocksize = g_bs;
+ dev->irqmode = g_irqmode;
+ dev->hw_queue_depth = g_hw_queue_depth;
+ dev->use_lightnvm = g_use_lightnvm;
+ dev->blocking = g_blocking;
+ dev->use_per_node_hctx = g_use_per_node_hctx;
+ return dev;
+}
+
+static void null_free_dev(struct nullb_device *dev)
+{
+ kfree(dev);
+}
+
static void put_tag(struct nullb_queue *nq, unsigned int tag)
{
clear_bit_unlock(tag, nq->tag_map);
cmd = &nq->cmds[tag];
cmd->tag = tag;
cmd->nq = nq;
- if (irqmode == NULL_IRQ_TIMER) {
+ if (nq->dev->irqmode == NULL_IRQ_TIMER) {
hrtimer_init(&cmd->timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
cmd->timer.function = null_cmd_timer_expired;
static void end_cmd(struct nullb_cmd *cmd)
{
struct request_queue *q = NULL;
+ int queue_mode = cmd->nq->dev->queue_mode;
if (cmd->rq)
q = cmd->rq->q;
static void null_cmd_end_timer(struct nullb_cmd *cmd)
{
- ktime_t kt = completion_nsec;
+ ktime_t kt = cmd->nq->dev->completion_nsec;
hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL);
}
static void null_softirq_done_fn(struct request *rq)
{
- if (queue_mode == NULL_Q_MQ)
+ struct nullb *nullb = rq->q->queuedata;
+
+ if (nullb->dev->queue_mode == NULL_Q_MQ)
end_cmd(blk_mq_rq_to_pdu(rq));
else
end_cmd(rq->special);
static inline void null_handle_cmd(struct nullb_cmd *cmd)
{
/* Complete IO by inline, softirq or timer */
- switch (irqmode) {
+ switch (cmd->nq->dev->irqmode) {
case NULL_IRQ_SOFTIRQ:
- switch (queue_mode) {
+ switch (cmd->nq->dev->queue_mode) {
case NULL_Q_MQ:
blk_mq_complete_request(cmd->rq);
break;
const struct blk_mq_queue_data *bd)
{
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
+ struct nullb_queue *nq = hctx->driver_data;
might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING);
- if (irqmode == NULL_IRQ_TIMER) {
+ if (nq->dev->irqmode == NULL_IRQ_TIMER) {
hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
cmd->timer.function = null_cmd_timer_expired;
}
cmd->rq = bd->rq;
- cmd->nq = hctx->driver_data;
+ cmd->nq = nq;
blk_mq_start_request(bd->rq);
static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
{
- sector_t size = gb * 1024 * 1024 * 1024ULL;
+ struct nullb *nullb = dev->q->queuedata;
+ sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
sector_t blksize;
struct nvm_id_group *grp;
id->ppaf.ch_offset = 56;
id->ppaf.ch_len = 8;
- sector_div(size, bs); /* convert size to pages */
+ sector_div(size, nullb->dev->blocksize); /* convert size to pages */
size >>= 8; /* concert size to pgs pr blk */
grp = &id->grp;
grp->mtype = 0;
grp->num_blk = blksize;
grp->num_pln = 1;
- grp->fpg_sz = bs;
- grp->csecs = bs;
+ grp->fpg_sz = nullb->dev->blocksize;
+ grp->csecs = nullb->dev->blocksize;
grp->trdt = 25000;
grp->trdm = 25000;
grp->tprt = 500000;
grp->tbet = 1500000;
grp->tbem = 1500000;
grp->mpos = 0x010101; /* single plane rwe */
- grp->cpar = hw_queue_depth;
+ grp->cpar = nullb->dev->hw_queue_depth;
return 0;
}
static void null_del_dev(struct nullb *nullb)
{
+ struct nullb_device *dev = nullb->dev;
+
list_del_init(&nullb->list);
- if (use_lightnvm)
+ if (dev->use_lightnvm)
null_nvm_unregister(nullb);
else
del_gendisk(nullb->disk);
blk_cleanup_queue(nullb->q);
- if (queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
+ if (dev->queue_mode == NULL_Q_MQ &&
+ nullb->tag_set == &nullb->__tag_set)
blk_mq_free_tag_set(nullb->tag_set);
- if (!use_lightnvm)
+ if (!dev->use_lightnvm)
put_disk(nullb->disk);
cleanup_queues(nullb);
kfree(nullb);
+ dev->nullb = NULL;
}
static int null_open(struct block_device *bdev, fmode_t mode)
init_waitqueue_head(&nq->wait);
nq->queue_depth = nullb->queue_depth;
+ nq->dev = nullb->dev;
}
static void null_init_queues(struct nullb *nullb)
static int setup_queues(struct nullb *nullb)
{
- nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue),
- GFP_KERNEL);
+ nullb->queues = kzalloc(nullb->dev->submit_queues *
+ sizeof(struct nullb_queue), GFP_KERNEL);
if (!nullb->queues)
return -ENOMEM;
nullb->nr_queues = 0;
- nullb->queue_depth = hw_queue_depth;
+ nullb->queue_depth = nullb->dev->hw_queue_depth;
return 0;
}
struct nullb_queue *nq;
int i, ret = 0;
- for (i = 0; i < submit_queues; i++) {
+ for (i = 0; i < nullb->dev->submit_queues; i++) {
nq = &nullb->queues[i];
null_init_queue(nullb, nq);
struct gendisk *disk;
sector_t size;
- disk = nullb->disk = alloc_disk_node(1, home_node);
+ disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node);
if (!disk)
return -ENOMEM;
- size = gb * 1024 * 1024 * 1024ULL;
+ size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
set_capacity(disk, size >> 9);
disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
return 0;
}
-static int null_init_tag_set(struct blk_mq_tag_set *set)
+static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
{
set->ops = &null_mq_ops;
- set->nr_hw_queues = submit_queues;
- set->queue_depth = hw_queue_depth;
- set->numa_node = home_node;
+ set->nr_hw_queues = nullb ? nullb->dev->submit_queues :
+ g_submit_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;
set->driver_data = NULL;
- if (blocking)
+ if (nullb->dev->blocking)
set->flags |= BLK_MQ_F_BLOCKING;
return blk_mq_alloc_tag_set(set);
}
-static int null_add_dev(void)
+static int null_add_dev(struct nullb_device *dev)
{
struct nullb *nullb;
int rv;
- nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node);
+ nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node);
if (!nullb) {
rv = -ENOMEM;
goto out;
}
+ nullb->dev = dev;
+ dev->nullb = nullb;
spin_lock_init(&nullb->lock);
if (rv)
goto out_free_nullb;
- if (queue_mode == NULL_Q_MQ) {
+ if (dev->queue_mode == NULL_Q_MQ) {
if (shared_tags) {
nullb->tag_set = &tag_set;
rv = 0;
} else {
nullb->tag_set = &nullb->__tag_set;
- rv = null_init_tag_set(nullb->tag_set);
+ rv = null_init_tag_set(nullb, nullb->tag_set);
}
if (rv)
goto out_cleanup_tags;
}
null_init_queues(nullb);
- } else if (queue_mode == NULL_Q_BIO) {
- nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node);
+ } else if (dev->queue_mode == NULL_Q_BIO) {
+ nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node);
if (!nullb->q) {
rv = -ENOMEM;
goto out_cleanup_queues;
if (rv)
goto out_cleanup_blk_queue;
} else {
- nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
+ nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock,
+ dev->home_node);
if (!nullb->q) {
rv = -ENOMEM;
goto out_cleanup_queues;
nullb->index = nullb_indexes++;
mutex_unlock(&lock);
- blk_queue_logical_block_size(nullb->q, bs);
- blk_queue_physical_block_size(nullb->q, bs);
+ blk_queue_logical_block_size(nullb->q, dev->blocksize);
+ blk_queue_physical_block_size(nullb->q, dev->blocksize);
sprintf(nullb->disk_name, "nullb%d", nullb->index);
- if (use_lightnvm)
+ if (dev->use_lightnvm)
rv = null_nvm_register(nullb);
else
rv = null_gendisk_register(nullb);
out_cleanup_blk_queue:
blk_cleanup_queue(nullb->q);
out_cleanup_tags:
- if (queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
+ if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
blk_mq_free_tag_set(nullb->tag_set);
out_cleanup_queues:
cleanup_queues(nullb);
out_free_nullb:
kfree(nullb);
out:
+ null_free_dev(dev);
return rv;
}
int ret = 0;
unsigned int i;
struct nullb *nullb;
+ struct nullb_device *dev;
- if (bs > PAGE_SIZE) {
+ if (g_bs > PAGE_SIZE) {
pr_warn("null_blk: invalid block size\n");
pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE);
- bs = PAGE_SIZE;
+ g_bs = PAGE_SIZE;
}
- if (use_lightnvm && bs != 4096) {
+ if (g_use_lightnvm && g_bs != 4096) {
pr_warn("null_blk: LightNVM only supports 4k block size\n");
pr_warn("null_blk: defaults block size to 4k\n");
- bs = 4096;
+ g_bs = 4096;
}
- if (use_lightnvm && queue_mode != NULL_Q_MQ) {
+ if (g_use_lightnvm && g_queue_mode != NULL_Q_MQ) {
pr_warn("null_blk: LightNVM only supported for blk-mq\n");
pr_warn("null_blk: defaults queue mode to blk-mq\n");
- queue_mode = NULL_Q_MQ;
+ g_queue_mode = NULL_Q_MQ;
}
- if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
- if (submit_queues != nr_online_nodes) {
+ if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
+ if (g_submit_queues != nr_online_nodes) {
pr_warn("null_blk: submit_queues param is set to %u.\n",
nr_online_nodes);
- submit_queues = nr_online_nodes;
+ g_submit_queues = nr_online_nodes;
}
- } else if (submit_queues > nr_cpu_ids)
- submit_queues = nr_cpu_ids;
- else if (submit_queues <= 0)
- submit_queues = 1;
+ } else if (g_submit_queues > nr_cpu_ids)
+ g_submit_queues = nr_cpu_ids;
+ else if (g_submit_queues <= 0)
+ g_submit_queues = 1;
- if (queue_mode == NULL_Q_MQ && shared_tags) {
- ret = null_init_tag_set(&tag_set);
+ if (g_queue_mode == NULL_Q_MQ && shared_tags) {
+ ret = null_init_tag_set(NULL, &tag_set);
if (ret)
return ret;
}
goto err_tagset;
}
- if (use_lightnvm) {
+ if (g_use_lightnvm) {
ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64),
0, 0, NULL);
if (!ppa_cache) {
}
for (i = 0; i < nr_devices; i++) {
- ret = null_add_dev();
- if (ret)
+ dev = null_alloc_dev();
+ if (!dev)
+ goto err_dev;
+ ret = null_add_dev(dev);
+ if (ret) {
+ null_free_dev(dev);
goto err_dev;
+ }
}
pr_info("null: module loaded\n");
err_dev:
while (!list_empty(&nullb_list)) {
nullb = list_entry(nullb_list.next, struct nullb, list);
+ dev = nullb->dev;
null_del_dev(nullb);
+ null_free_dev(dev);
}
kmem_cache_destroy(ppa_cache);
err_ppa:
unregister_blkdev(null_major, "nullb");
err_tagset:
- if (queue_mode == NULL_Q_MQ && shared_tags)
+ if (g_queue_mode == NULL_Q_MQ && shared_tags)
blk_mq_free_tag_set(&tag_set);
return ret;
}
mutex_lock(&lock);
while (!list_empty(&nullb_list)) {
+ struct nullb_device *dev;
+
nullb = list_entry(nullb_list.next, struct nullb, list);
+ dev = nullb->dev;
null_del_dev(nullb);
+ null_free_dev(dev);
}
mutex_unlock(&lock);
- if (queue_mode == NULL_Q_MQ && shared_tags)
+ if (g_queue_mode == NULL_Q_MQ && shared_tags)
blk_mq_free_tag_set(&tag_set);
kmem_cache_destroy(ppa_cache);
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