diff options
author | Matias Bjørling <m@bjorling.me> | 2015-11-12 22:25:10 +0300 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-11-17 01:22:28 +0300 |
commit | b2b7e00148a203e9934bbd17aebffae3f447ade7 (patch) | |
tree | 008f24a28ef3b9d57ed39af3b621d084dde71008 /drivers/block/null_blk.c | |
parent | 4736346bb47966254ee6d1fc50267a2609791cba (diff) | |
download | linux-b2b7e00148a203e9934bbd17aebffae3f447ade7.tar.xz |
null_blk: register as a LightNVM device
Add support for registering as a LightNVM device. This allows us to
evaluate the performance of the LightNVM subsystem.
In /drivers/Makefile, LightNVM is moved above block device drivers
to make sure that the LightNVM media managers have been initialized
before drivers under /drivers/block are initialized.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Fix by Jens Axboe to remove unneeded slab cache and the following
memory leak.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/null_blk.c')
-rw-r--r-- | drivers/block/null_blk.c | 160 |
1 files changed, 154 insertions, 6 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 6255d1c4bba4..816525143a74 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -8,6 +8,7 @@ #include <linux/slab.h> #include <linux/blk-mq.h> #include <linux/hrtimer.h> +#include <linux/lightnvm.h> struct nullb_cmd { struct list_head list; @@ -39,6 +40,7 @@ struct nullb { struct nullb_queue *queues; unsigned int nr_queues; + char disk_name[DISK_NAME_LEN]; }; static LIST_HEAD(nullb_list); @@ -119,6 +121,10 @@ static int nr_devices = 2; 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); +MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); + static int irqmode = NULL_IRQ_SOFTIRQ; static int null_set_irqmode(const char *str, const struct kernel_param *kp) @@ -427,6 +433,8 @@ static void null_del_dev(struct nullb *nullb) { list_del_init(&nullb->list); + if (use_lightnvm) + nvm_unregister(nullb->disk->disk_name); del_gendisk(nullb->disk); blk_cleanup_queue(nullb->q); if (queue_mode == NULL_Q_MQ) @@ -436,6 +444,125 @@ static void null_del_dev(struct nullb *nullb) kfree(nullb); } +#ifdef CONFIG_NVM + +static void null_lnvm_end_io(struct request *rq, int error) +{ + struct nvm_rq *rqd = rq->end_io_data; + struct nvm_dev *dev = rqd->dev; + + dev->mt->end_io(rqd, error); + + blk_put_request(rq); +} + +static int null_lnvm_submit_io(struct request_queue *q, struct nvm_rq *rqd) +{ + struct request *rq; + struct bio *bio = rqd->bio; + + rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0); + if (IS_ERR(rq)) + return -ENOMEM; + + rq->cmd_type = REQ_TYPE_DRV_PRIV; + rq->__sector = bio->bi_iter.bi_sector; + rq->ioprio = bio_prio(bio); + + if (bio_has_data(bio)) + rq->nr_phys_segments = bio_phys_segments(q, bio); + + rq->__data_len = bio->bi_iter.bi_size; + rq->bio = rq->biotail = bio; + + rq->end_io_data = rqd; + + blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); + + return 0; +} + +static int null_lnvm_id(struct request_queue *q, struct nvm_id *id) +{ + sector_t size = gb * 1024 * 1024 * 1024ULL; + struct nvm_id_group *grp; + + id->ver_id = 0x1; + id->vmnt = 0; + id->cgrps = 1; + id->cap = 0x3; + id->dom = 0x1; + id->ppat = NVM_ADDRMODE_LINEAR; + + do_div(size, bs); /* convert size to pages */ + grp = &id->groups[0]; + grp->mtype = 0; + grp->fmtype = 1; + grp->num_ch = 1; + grp->num_lun = 1; + grp->num_pln = 1; + grp->num_blk = size / 256; + grp->num_pg = 256; + grp->fpg_sz = bs; + grp->csecs = bs; + grp->trdt = 25000; + grp->trdm = 25000; + grp->tprt = 500000; + grp->tprm = 500000; + grp->tbet = 1500000; + grp->tbem = 1500000; + grp->mpos = 0x010101; /* single plane rwe */ + grp->cpar = hw_queue_depth; + + return 0; +} + +static void *null_lnvm_create_dma_pool(struct request_queue *q, char *name) +{ + mempool_t *virtmem_pool; + + virtmem_pool = mempool_create_page_pool(64, 0); + if (!virtmem_pool) { + pr_err("null_blk: Unable to create virtual memory pool\n"); + return NULL; + } + + return virtmem_pool; +} + +static void null_lnvm_destroy_dma_pool(void *pool) +{ + mempool_destroy(pool); +} + +static void *null_lnvm_dev_dma_alloc(struct request_queue *q, void *pool, + gfp_t mem_flags, dma_addr_t *dma_handler) +{ + return mempool_alloc(pool, mem_flags); +} + +static void null_lnvm_dev_dma_free(void *pool, void *entry, + dma_addr_t dma_handler) +{ + mempool_free(entry, pool); +} + +static struct nvm_dev_ops null_lnvm_dev_ops = { + .identity = null_lnvm_id, + .submit_io = null_lnvm_submit_io, + + .create_dma_pool = null_lnvm_create_dma_pool, + .destroy_dma_pool = null_lnvm_destroy_dma_pool, + .dev_dma_alloc = null_lnvm_dev_dma_alloc, + .dev_dma_free = null_lnvm_dev_dma_free, + + /* Simulate nvme protocol restriction */ + .max_phys_sect = 64, +}; +#else +static struct nvm_dev_ops null_lnvm_dev_ops; +#endif /* CONFIG_NVM */ + static int null_open(struct block_device *bdev, fmode_t mode) { return 0; @@ -575,11 +702,6 @@ static int null_add_dev(void) queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); - disk = nullb->disk = alloc_disk_node(1, home_node); - if (!disk) { - rv = -ENOMEM; - goto out_cleanup_blk_queue; - } mutex_lock(&lock); list_add_tail(&nullb->list, &nullb_list); @@ -589,6 +711,21 @@ static int null_add_dev(void) blk_queue_logical_block_size(nullb->q, bs); blk_queue_physical_block_size(nullb->q, bs); + sprintf(nullb->disk_name, "nullb%d", nullb->index); + + if (use_lightnvm) { + rv = nvm_register(nullb->q, nullb->disk_name, + &null_lnvm_dev_ops); + if (rv) + goto out_cleanup_blk_queue; + goto done; + } + + disk = nullb->disk = alloc_disk_node(1, home_node); + if (!disk) { + rv = -ENOMEM; + goto out_cleanup_lightnvm; + } size = gb * 1024 * 1024 * 1024ULL; set_capacity(disk, size >> 9); @@ -598,10 +735,15 @@ static int null_add_dev(void) disk->fops = &null_fops; disk->private_data = nullb; disk->queue = nullb->q; - sprintf(disk->disk_name, "nullb%d", nullb->index); + strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); + add_disk(disk); +done: return 0; +out_cleanup_lightnvm: + if (use_lightnvm) + nvm_unregister(nullb->disk_name); out_cleanup_blk_queue: blk_cleanup_queue(nullb->q); out_cleanup_tags: @@ -625,6 +767,12 @@ static int __init null_init(void) bs = PAGE_SIZE; } + if (use_lightnvm && 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; + } + 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.", |