struct request_queue *q;
struct gendisk *disk;
struct nvm_dev *ndev;
- struct blk_mq_tag_set tag_set;
+ struct blk_mq_tag_set *tag_set;
+ struct blk_mq_tag_set __tag_set;
struct hrtimer timer;
unsigned int queue_depth;
spinlock_t lock;
static int null_major;
static int nullb_indexes;
static struct kmem_cache *ppa_cache;
+static struct blk_mq_tag_set tag_set;
enum {
NULL_IRQ_NONE = 0,
module_param(bs, int, S_IRUGO);
MODULE_PARM_DESC(bs, "Block size (in bytes)");
-static int nr_devices = 2;
+static int nr_devices = 1;
module_param(nr_devices, int, S_IRUGO);
MODULE_PARM_DESC(nr_devices, "Number of devices to register");
module_param(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 null_set_irqmode(const char *str, const struct kernel_param *kp)
switch (queue_mode) {
case NULL_Q_MQ:
- blk_mq_end_request(cmd->rq, 0);
+ blk_mq_end_request(cmd->rq, BLK_STS_OK);
return;
case NULL_Q_RQ:
INIT_LIST_HEAD(&cmd->rq->queuelist);
- blk_end_request_all(cmd->rq, 0);
+ blk_end_request_all(cmd->rq, BLK_STS_OK);
break;
case NULL_Q_BIO:
bio_endio(cmd->bio);
}
}
-static int null_queue_rq(struct blk_mq_hw_ctx *hctx,
+static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
blk_mq_start_request(bd->rq);
null_handle_cmd(cmd);
- return BLK_MQ_RQ_QUEUE_OK;
-}
-
-static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)
-{
- BUG_ON(!nullb);
- BUG_ON(!nq);
-
- init_waitqueue_head(&nq->wait);
- nq->queue_depth = nullb->queue_depth;
-}
-
-static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
- unsigned int index)
-{
- struct nullb *nullb = data;
- struct nullb_queue *nq = &nullb->queues[index];
-
- hctx->driver_data = nq;
- null_init_queue(nullb, nq);
- nullb->nr_queues++;
-
- return 0;
+ return BLK_STS_OK;
}
static const struct blk_mq_ops null_mq_ops = {
.queue_rq = null_queue_rq,
- .init_hctx = null_init_hctx,
.complete = null_softirq_done_fn,
};
#ifdef CONFIG_NVM
-static void null_lnvm_end_io(struct request *rq, int error)
+static void null_lnvm_end_io(struct request *rq, blk_status_t status)
{
struct nvm_rq *rqd = rq->end_io_data;
- rqd->error = error;
+ /* XXX: lighnvm core seems to expect NVM_RSP_* values here.. */
+ rqd->error = status ? -EIO : 0;
nvm_end_io(rqd);
blk_put_request(rq);
else
del_gendisk(nullb->disk);
blk_cleanup_queue(nullb->q);
- if (queue_mode == NULL_Q_MQ)
- blk_mq_free_tag_set(&nullb->tag_set);
+ if (queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
+ blk_mq_free_tag_set(nullb->tag_set);
if (!use_lightnvm)
put_disk(nullb->disk);
cleanup_queues(nullb);
.release = null_release,
};
+static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)
+{
+ BUG_ON(!nullb);
+ BUG_ON(!nq);
+
+ init_waitqueue_head(&nq->wait);
+ nq->queue_depth = nullb->queue_depth;
+}
+
+static void null_init_queues(struct nullb *nullb)
+{
+ struct request_queue *q = nullb->q;
+ struct blk_mq_hw_ctx *hctx;
+ struct nullb_queue *nq;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ if (!hctx->nr_ctx || !hctx->tags)
+ continue;
+ nq = &nullb->queues[i];
+ hctx->driver_data = nq;
+ null_init_queue(nullb, nq);
+ nullb->nr_queues++;
+ }
+}
+
static int setup_commands(struct nullb_queue *nq)
{
struct nullb_cmd *cmd;
return 0;
}
+static int null_init_tag_set(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->cmd_size = sizeof(struct nullb_cmd);
+ set->flags = BLK_MQ_F_SHOULD_MERGE;
+ set->driver_data = NULL;
+
+ if (blocking)
+ set->flags |= BLK_MQ_F_BLOCKING;
+
+ return blk_mq_alloc_tag_set(set);
+}
+
static int null_add_dev(void)
{
struct nullb *nullb;
goto out_free_nullb;
if (queue_mode == NULL_Q_MQ) {
- nullb->tag_set.ops = &null_mq_ops;
- nullb->tag_set.nr_hw_queues = submit_queues;
- nullb->tag_set.queue_depth = hw_queue_depth;
- nullb->tag_set.numa_node = home_node;
- nullb->tag_set.cmd_size = sizeof(struct nullb_cmd);
- nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
- nullb->tag_set.driver_data = nullb;
-
- if (blocking)
- nullb->tag_set.flags |= BLK_MQ_F_BLOCKING;
-
- rv = blk_mq_alloc_tag_set(&nullb->tag_set);
+ 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);
+ }
+
if (rv)
goto out_cleanup_queues;
- nullb->q = blk_mq_init_queue(&nullb->tag_set);
+ nullb->q = blk_mq_init_queue(nullb->tag_set);
if (IS_ERR(nullb->q)) {
rv = -ENOMEM;
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);
if (!nullb->q) {
out_cleanup_blk_queue:
blk_cleanup_queue(nullb->q);
out_cleanup_tags:
- if (queue_mode == NULL_Q_MQ)
- blk_mq_free_tag_set(&nullb->tag_set);
+ if (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:
queue_mode = NULL_Q_MQ;
}
+ if (queue_mode == NULL_Q_MQ && shared_tags)
+ null_init_tag_set(&tag_set);
+
if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
if (submit_queues < nr_online_nodes) {
pr_warn("null_blk: submit_queues param is set to %u.",
}
mutex_unlock(&lock);
+ if (queue_mode == NULL_Q_MQ && shared_tags)
+ blk_mq_free_tag_set(&tag_set);
+
kmem_cache_destroy(ppa_cache);
}
projects / karo-tx-linux.git / blobdiff